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linux-next/drivers/tty/synclinkmp.c
Arnd Bergmann b8c98ae49e tty: synclink: avoid sleep_on race 
The four variants of the synclink driver use the same code in their
open() callback to wait for a port in process of being closed,
using interruptible_sleep_on, which is racy and going away soon.

Making things worse, these functions hold the BTM while doing so,
which means that if we ever enter this code path, we cannot actually
continue since the other thread that is in process of closing the
port can no longer get the BTM.

This addresses both issues by using wait_event_interruptible_tty()
instead.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-01-07 17:05:21 -08:00

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/*
* $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
*
* Device driver for Microgate SyncLink Multiport
* high speed multiprotocol serial adapter.
*
* written by Paul Fulghum for Microgate Corporation
* paulkf@microgate.com
*
* Microgate and SyncLink are trademarks of Microgate Corporation
*
* Derived from serial.c written by Theodore Ts'o and Linus Torvalds
* This code is released under the GNU General Public License (GPL)
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
#if defined(__i386__)
# define BREAKPOINT() asm(" int $3");
#else
# define BREAKPOINT() { }
#endif
#define MAX_DEVICES 12
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/ioctl.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/dma.h>
#include <linux/bitops.h>
#include <asm/types.h>
#include <linux/termios.h>
#include <linux/workqueue.h>
#include <linux/hdlc.h>
#include <linux/synclink.h>
#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
#define SYNCLINK_GENERIC_HDLC 1
#else
#define SYNCLINK_GENERIC_HDLC 0
#endif
#define GET_USER(error,value,addr) error = get_user(value,addr)
#define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
#define PUT_USER(error,value,addr) error = put_user(value,addr)
#define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
#include <asm/uaccess.h>
static MGSL_PARAMS default_params = {
MGSL_MODE_HDLC, /* unsigned long mode */
0, /* unsigned char loopback; */
HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
0, /* unsigned long clock_speed; */
0xff, /* unsigned char addr_filter; */
HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
9600, /* unsigned long data_rate; */
8, /* unsigned char data_bits; */
1, /* unsigned char stop_bits; */
ASYNC_PARITY_NONE /* unsigned char parity; */
};
/* size in bytes of DMA data buffers */
#define SCABUFSIZE 1024
#define SCA_MEM_SIZE 0x40000
#define SCA_BASE_SIZE 512
#define SCA_REG_SIZE 16
#define SCA_MAX_PORTS 4
#define SCAMAXDESC 128
#define BUFFERLISTSIZE 4096
/* SCA-I style DMA buffer descriptor */
typedef struct _SCADESC
{
u16 next; /* lower l6 bits of next descriptor addr */
u16 buf_ptr; /* lower 16 bits of buffer addr */
u8 buf_base; /* upper 8 bits of buffer addr */
u8 pad1;
u16 length; /* length of buffer */
u8 status; /* status of buffer */
u8 pad2;
} SCADESC, *PSCADESC;
typedef struct _SCADESC_EX
{
/* device driver bookkeeping section */
char *virt_addr; /* virtual address of data buffer */
u16 phys_entry; /* lower 16-bits of physical address of this descriptor */
} SCADESC_EX, *PSCADESC_EX;
/* The queue of BH actions to be performed */
#define BH_RECEIVE 1
#define BH_TRANSMIT 2
#define BH_STATUS 4
#define IO_PIN_SHUTDOWN_LIMIT 100
struct _input_signal_events {
int ri_up;
int ri_down;
int dsr_up;
int dsr_down;
int dcd_up;
int dcd_down;
int cts_up;
int cts_down;
};
/*
* Device instance data structure
*/
typedef struct _synclinkmp_info {
void *if_ptr; /* General purpose pointer (used by SPPP) */
int magic;
struct tty_port port;
int line;
unsigned short close_delay;
unsigned short closing_wait; /* time to wait before closing */
struct mgsl_icount icount;
int timeout;
int x_char; /* xon/xoff character */
u16 read_status_mask1; /* break detection (SR1 indications) */
u16 read_status_mask2; /* parity/framing/overun (SR2 indications) */
unsigned char ignore_status_mask1; /* break detection (SR1 indications) */
unsigned char ignore_status_mask2; /* parity/framing/overun (SR2 indications) */
unsigned char *tx_buf;
int tx_put;
int tx_get;
int tx_count;
wait_queue_head_t status_event_wait_q;
wait_queue_head_t event_wait_q;
struct timer_list tx_timer; /* HDLC transmit timeout timer */
struct _synclinkmp_info *next_device; /* device list link */
struct timer_list status_timer; /* input signal status check timer */
spinlock_t lock; /* spinlock for synchronizing with ISR */
struct work_struct task; /* task structure for scheduling bh */
u32 max_frame_size; /* as set by device config */
u32 pending_bh;
bool bh_running; /* Protection from multiple */
int isr_overflow;
bool bh_requested;
int dcd_chkcount; /* check counts to prevent */
int cts_chkcount; /* too many IRQs if a signal */
int dsr_chkcount; /* is floating */
int ri_chkcount;
char *buffer_list; /* virtual address of Rx & Tx buffer lists */
unsigned long buffer_list_phys;
unsigned int rx_buf_count; /* count of total allocated Rx buffers */
SCADESC *rx_buf_list; /* list of receive buffer entries */
SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
unsigned int current_rx_buf;
unsigned int tx_buf_count; /* count of total allocated Tx buffers */
SCADESC *tx_buf_list; /* list of transmit buffer entries */
SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
unsigned int last_tx_buf;
unsigned char *tmp_rx_buf;
unsigned int tmp_rx_buf_count;
bool rx_enabled;
bool rx_overflow;
bool tx_enabled;
bool tx_active;
u32 idle_mode;
unsigned char ie0_value;
unsigned char ie1_value;
unsigned char ie2_value;
unsigned char ctrlreg_value;
unsigned char old_signals;
char device_name[25]; /* device instance name */
int port_count;
int adapter_num;
int port_num;
struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
unsigned int irq_level; /* interrupt level */
unsigned long irq_flags;
bool irq_requested; /* true if IRQ requested */
MGSL_PARAMS params; /* communications parameters */
unsigned char serial_signals; /* current serial signal states */
bool irq_occurred; /* for diagnostics use */
unsigned int init_error; /* Initialization startup error */
u32 last_mem_alloc;
unsigned char* memory_base; /* shared memory address (PCI only) */
u32 phys_memory_base;
int shared_mem_requested;
unsigned char* sca_base; /* HD64570 SCA Memory address */
u32 phys_sca_base;
u32 sca_offset;
bool sca_base_requested;
unsigned char* lcr_base; /* local config registers (PCI only) */
u32 phys_lcr_base;
u32 lcr_offset;
int lcr_mem_requested;
unsigned char* statctrl_base; /* status/control register memory */
u32 phys_statctrl_base;
u32 statctrl_offset;
bool sca_statctrl_requested;
u32 misc_ctrl_value;
char *flag_buf;
bool drop_rts_on_tx_done;
struct _input_signal_events input_signal_events;
/* SPPP/Cisco HDLC device parts */
int netcount;
spinlock_t netlock;
#if SYNCLINK_GENERIC_HDLC
struct net_device *netdev;
#endif
} SLMP_INFO;
#define MGSL_MAGIC 0x5401
/*
* define serial signal status change macros
*/
#define MISCSTATUS_DCD_LATCHED (SerialSignal_DCD<<8) /* indicates change in DCD */
#define MISCSTATUS_RI_LATCHED (SerialSignal_RI<<8) /* indicates change in RI */
#define MISCSTATUS_CTS_LATCHED (SerialSignal_CTS<<8) /* indicates change in CTS */
#define MISCSTATUS_DSR_LATCHED (SerialSignal_DSR<<8) /* change in DSR */
/* Common Register macros */
#define LPR 0x00
#define PABR0 0x02
#define PABR1 0x03
#define WCRL 0x04
#define WCRM 0x05
#define WCRH 0x06
#define DPCR 0x08
#define DMER 0x09
#define ISR0 0x10
#define ISR1 0x11
#define ISR2 0x12
#define IER0 0x14
#define IER1 0x15
#define IER2 0x16
#define ITCR 0x18
#define INTVR 0x1a
#define IMVR 0x1c
/* MSCI Register macros */
#define TRB 0x20
#define TRBL 0x20
#define TRBH 0x21
#define SR0 0x22
#define SR1 0x23
#define SR2 0x24
#define SR3 0x25
#define FST 0x26
#define IE0 0x28
#define IE1 0x29
#define IE2 0x2a
#define FIE 0x2b
#define CMD 0x2c
#define MD0 0x2e
#define MD1 0x2f
#define MD2 0x30
#define CTL 0x31
#define SA0 0x32
#define SA1 0x33
#define IDL 0x34
#define TMC 0x35
#define RXS 0x36
#define TXS 0x37
#define TRC0 0x38
#define TRC1 0x39
#define RRC 0x3a
#define CST0 0x3c
#define CST1 0x3d
/* Timer Register Macros */
#define TCNT 0x60
#define TCNTL 0x60
#define TCNTH 0x61
#define TCONR 0x62
#define TCONRL 0x62
#define TCONRH 0x63
#define TMCS 0x64
#define TEPR 0x65
/* DMA Controller Register macros */
#define DARL 0x80
#define DARH 0x81
#define DARB 0x82
#define BAR 0x80
#define BARL 0x80
#define BARH 0x81
#define BARB 0x82
#define SAR 0x84
#define SARL 0x84
#define SARH 0x85
#define SARB 0x86
#define CPB 0x86
#define CDA 0x88
#define CDAL 0x88
#define CDAH 0x89
#define EDA 0x8a
#define EDAL 0x8a
#define EDAH 0x8b
#define BFL 0x8c
#define BFLL 0x8c
#define BFLH 0x8d
#define BCR 0x8e
#define BCRL 0x8e
#define BCRH 0x8f
#define DSR 0x90
#define DMR 0x91
#define FCT 0x93
#define DIR 0x94
#define DCMD 0x95
/* combine with timer or DMA register address */
#define TIMER0 0x00
#define TIMER1 0x08
#define TIMER2 0x10
#define TIMER3 0x18
#define RXDMA 0x00
#define TXDMA 0x20
/* SCA Command Codes */
#define NOOP 0x00
#define TXRESET 0x01
#define TXENABLE 0x02
#define TXDISABLE 0x03
#define TXCRCINIT 0x04
#define TXCRCEXCL 0x05
#define TXEOM 0x06
#define TXABORT 0x07
#define MPON 0x08
#define TXBUFCLR 0x09
#define RXRESET 0x11
#define RXENABLE 0x12
#define RXDISABLE 0x13
#define RXCRCINIT 0x14
#define RXREJECT 0x15
#define SEARCHMP 0x16
#define RXCRCEXCL 0x17
#define RXCRCCALC 0x18
#define CHRESET 0x21
#define HUNT 0x31
/* DMA command codes */
#define SWABORT 0x01
#define FEICLEAR 0x02
/* IE0 */
#define TXINTE BIT7
#define RXINTE BIT6
#define TXRDYE BIT1
#define RXRDYE BIT0
/* IE1 & SR1 */
#define UDRN BIT7
#define IDLE BIT6
#define SYNCD BIT4
#define FLGD BIT4
#define CCTS BIT3
#define CDCD BIT2
#define BRKD BIT1
#define ABTD BIT1
#define GAPD BIT1
#define BRKE BIT0
#define IDLD BIT0
/* IE2 & SR2 */
#define EOM BIT7
#define PMP BIT6
#define SHRT BIT6
#define PE BIT5
#define ABT BIT5
#define FRME BIT4
#define RBIT BIT4
#define OVRN BIT3
#define CRCE BIT2
/*
* Global linked list of SyncLink devices
*/
static SLMP_INFO *synclinkmp_device_list = NULL;
static int synclinkmp_adapter_count = -1;
static int synclinkmp_device_count = 0;
/*
* Set this param to non-zero to load eax with the
* .text section address and breakpoint on module load.
* This is useful for use with gdb and add-symbol-file command.
*/
static bool break_on_load = 0;
/*
* Driver major number, defaults to zero to get auto
* assigned major number. May be forced as module parameter.
*/
static int ttymajor = 0;
/*
* Array of user specified options for ISA adapters.
*/
static int debug_level = 0;
static int maxframe[MAX_DEVICES] = {0,};
module_param(break_on_load, bool, 0);
module_param(ttymajor, int, 0);
module_param(debug_level, int, 0);
module_param_array(maxframe, int, NULL, 0);
static char *driver_name = "SyncLink MultiPort driver";
static char *driver_version = "$Revision: 4.38 $";
static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
static void synclinkmp_remove_one(struct pci_dev *dev);
static struct pci_device_id synclinkmp_pci_tbl[] = {
{ PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
{ 0, }, /* terminate list */
};
MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
MODULE_LICENSE("GPL");
static struct pci_driver synclinkmp_pci_driver = {
.name = "synclinkmp",
.id_table = synclinkmp_pci_tbl,
.probe = synclinkmp_init_one,
.remove = synclinkmp_remove_one,
};
static struct tty_driver *serial_driver;
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
/* tty callbacks */
static int open(struct tty_struct *tty, struct file * filp);
static void close(struct tty_struct *tty, struct file * filp);
static void hangup(struct tty_struct *tty);
static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
static int write(struct tty_struct *tty, const unsigned char *buf, int count);
static int put_char(struct tty_struct *tty, unsigned char ch);
static void send_xchar(struct tty_struct *tty, char ch);
static void wait_until_sent(struct tty_struct *tty, int timeout);
static int write_room(struct tty_struct *tty);
static void flush_chars(struct tty_struct *tty);
static void flush_buffer(struct tty_struct *tty);
static void tx_hold(struct tty_struct *tty);
static void tx_release(struct tty_struct *tty);
static int ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
static int chars_in_buffer(struct tty_struct *tty);
static void throttle(struct tty_struct * tty);
static void unthrottle(struct tty_struct * tty);
static int set_break(struct tty_struct *tty, int break_state);
#if SYNCLINK_GENERIC_HDLC
#define dev_to_port(D) (dev_to_hdlc(D)->priv)
static void hdlcdev_tx_done(SLMP_INFO *info);
static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
static int hdlcdev_init(SLMP_INFO *info);
static void hdlcdev_exit(SLMP_INFO *info);
#endif
/* ioctl handlers */
static int get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
static int get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
static int set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
static int get_txidle(SLMP_INFO *info, int __user *idle_mode);
static int set_txidle(SLMP_INFO *info, int idle_mode);
static int tx_enable(SLMP_INFO *info, int enable);
static int tx_abort(SLMP_INFO *info);
static int rx_enable(SLMP_INFO *info, int enable);
static int modem_input_wait(SLMP_INFO *info,int arg);
static int wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
static int tiocmget(struct tty_struct *tty);
static int tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
static int set_break(struct tty_struct *tty, int break_state);
static void add_device(SLMP_INFO *info);
static void device_init(int adapter_num, struct pci_dev *pdev);
static int claim_resources(SLMP_INFO *info);
static void release_resources(SLMP_INFO *info);
static int startup(SLMP_INFO *info);
static int block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
static int carrier_raised(struct tty_port *port);
static void shutdown(SLMP_INFO *info);
static void program_hw(SLMP_INFO *info);
static void change_params(SLMP_INFO *info);
static bool init_adapter(SLMP_INFO *info);
static bool register_test(SLMP_INFO *info);
static bool irq_test(SLMP_INFO *info);
static bool loopback_test(SLMP_INFO *info);
static int adapter_test(SLMP_INFO *info);
static bool memory_test(SLMP_INFO *info);
static void reset_adapter(SLMP_INFO *info);
static void reset_port(SLMP_INFO *info);
static void async_mode(SLMP_INFO *info);
static void hdlc_mode(SLMP_INFO *info);
static void rx_stop(SLMP_INFO *info);
static void rx_start(SLMP_INFO *info);
static void rx_reset_buffers(SLMP_INFO *info);
static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
static bool rx_get_frame(SLMP_INFO *info);
static void tx_start(SLMP_INFO *info);
static void tx_stop(SLMP_INFO *info);
static void tx_load_fifo(SLMP_INFO *info);
static void tx_set_idle(SLMP_INFO *info);
static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
static void get_signals(SLMP_INFO *info);
static void set_signals(SLMP_INFO *info);
static void enable_loopback(SLMP_INFO *info, int enable);
static void set_rate(SLMP_INFO *info, u32 data_rate);
static int bh_action(SLMP_INFO *info);
static void bh_handler(struct work_struct *work);
static void bh_receive(SLMP_INFO *info);
static void bh_transmit(SLMP_INFO *info);
static void bh_status(SLMP_INFO *info);
static void isr_timer(SLMP_INFO *info);
static void isr_rxint(SLMP_INFO *info);
static void isr_rxrdy(SLMP_INFO *info);
static void isr_txint(SLMP_INFO *info);
static void isr_txrdy(SLMP_INFO *info);
static void isr_rxdmaok(SLMP_INFO *info);
static void isr_rxdmaerror(SLMP_INFO *info);
static void isr_txdmaok(SLMP_INFO *info);
static void isr_txdmaerror(SLMP_INFO *info);
static void isr_io_pin(SLMP_INFO *info, u16 status);
static int alloc_dma_bufs(SLMP_INFO *info);
static void free_dma_bufs(SLMP_INFO *info);
static int alloc_buf_list(SLMP_INFO *info);
static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
static int alloc_tmp_rx_buf(SLMP_INFO *info);
static void free_tmp_rx_buf(SLMP_INFO *info);
static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
static void tx_timeout(unsigned long context);
static void status_timeout(unsigned long context);
static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
static unsigned char read_status_reg(SLMP_INFO * info);
static void write_control_reg(SLMP_INFO * info);
static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
static u32 misc_ctrl_value = 0x007e4040;
static u32 lcr1_brdr_value = 0x00800028;
static u32 read_ahead_count = 8;
/* DPCR, DMA Priority Control
*
* 07..05 Not used, must be 0
* 04 BRC, bus release condition: 0=all transfers complete
* 1=release after 1 xfer on all channels
* 03 CCC, channel change condition: 0=every cycle
* 1=after each channel completes all xfers
* 02..00 PR<2..0>, priority 100=round robin
*
* 00000100 = 0x00
*/
static unsigned char dma_priority = 0x04;
// Number of bytes that can be written to shared RAM
// in a single write operation
static u32 sca_pci_load_interval = 64;
/*
* 1st function defined in .text section. Calling this function in
* init_module() followed by a breakpoint allows a remote debugger
* (gdb) to get the .text address for the add-symbol-file command.
* This allows remote debugging of dynamically loadable modules.
*/
static void* synclinkmp_get_text_ptr(void);
static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
static inline int sanity_check(SLMP_INFO *info,
char *name, const char *routine)
{
#ifdef SANITY_CHECK
static const char *badmagic =
"Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
static const char *badinfo =
"Warning: null synclinkmp_struct for (%s) in %s\n";
if (!info) {
printk(badinfo, name, routine);
return 1;
}
if (info->magic != MGSL_MAGIC) {
printk(badmagic, name, routine);
return 1;
}
#else
if (!info)
return 1;
#endif
return 0;
}
/**
* line discipline callback wrappers
*
* The wrappers maintain line discipline references
* while calling into the line discipline.
*
* ldisc_receive_buf - pass receive data to line discipline
*/
static void ldisc_receive_buf(struct tty_struct *tty,
const __u8 *data, char *flags, int count)
{
struct tty_ldisc *ld;
if (!tty)
return;
ld = tty_ldisc_ref(tty);
if (ld) {
if (ld->ops->receive_buf)
ld->ops->receive_buf(tty, data, flags, count);
tty_ldisc_deref(ld);
}
}
/* tty callbacks */
static int install(struct tty_driver *driver, struct tty_struct *tty)
{
SLMP_INFO *info;
int line = tty->index;
if (line >= synclinkmp_device_count) {
printk("%s(%d): open with invalid line #%d.\n",
__FILE__,__LINE__,line);
return -ENODEV;
}
info = synclinkmp_device_list;
while (info && info->line != line)
info = info->next_device;
if (sanity_check(info, tty->name, "open"))
return -ENODEV;
if (info->init_error) {
printk("%s(%d):%s device is not allocated, init error=%d\n",
__FILE__, __LINE__, info->device_name,
info->init_error);
return -ENODEV;
}
tty->driver_data = info;
return tty_port_install(&info->port, driver, tty);
}
/* Called when a port is opened. Init and enable port.
*/
static int open(struct tty_struct *tty, struct file *filp)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
int retval;
info->port.tty = tty;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s open(), old ref count = %d\n",
__FILE__,__LINE__,tty->driver->name, info->port.count);
/* If port is closing, signal caller to try again */
if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
wait_event_interruptible_tty(tty, info->port.close_wait,
!(info->port.flags & ASYNC_CLOSING));
retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
goto cleanup;
}
info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
spin_lock_irqsave(&info->netlock, flags);
if (info->netcount) {
retval = -EBUSY;
spin_unlock_irqrestore(&info->netlock, flags);
goto cleanup;
}
info->port.count++;
spin_unlock_irqrestore(&info->netlock, flags);
if (info->port.count == 1) {
/* 1st open on this device, init hardware */
retval = startup(info);
if (retval < 0)
goto cleanup;
}
retval = block_til_ready(tty, filp, info);
if (retval) {
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s block_til_ready() returned %d\n",
__FILE__,__LINE__, info->device_name, retval);
goto cleanup;
}
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s open() success\n",
__FILE__,__LINE__, info->device_name);
retval = 0;
cleanup:
if (retval) {
if (tty->count == 1)
info->port.tty = NULL; /* tty layer will release tty struct */
if(info->port.count)
info->port.count--;
}
return retval;
}
/* Called when port is closed. Wait for remaining data to be
* sent. Disable port and free resources.
*/
static void close(struct tty_struct *tty, struct file *filp)
{
SLMP_INFO * info = tty->driver_data;
if (sanity_check(info, tty->name, "close"))
return;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s close() entry, count=%d\n",
__FILE__,__LINE__, info->device_name, info->port.count);
if (tty_port_close_start(&info->port, tty, filp) == 0)
goto cleanup;
mutex_lock(&info->port.mutex);
if (info->port.flags & ASYNC_INITIALIZED)
wait_until_sent(tty, info->timeout);
flush_buffer(tty);
tty_ldisc_flush(tty);
shutdown(info);
mutex_unlock(&info->port.mutex);
tty_port_close_end(&info->port, tty);
info->port.tty = NULL;
cleanup:
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
tty->driver->name, info->port.count);
}
/* Called by tty_hangup() when a hangup is signaled.
* This is the same as closing all open descriptors for the port.
*/
static void hangup(struct tty_struct *tty)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s hangup()\n",
__FILE__,__LINE__, info->device_name );
if (sanity_check(info, tty->name, "hangup"))
return;
mutex_lock(&info->port.mutex);
flush_buffer(tty);
shutdown(info);
spin_lock_irqsave(&info->port.lock, flags);
info->port.count = 0;
info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
info->port.tty = NULL;
spin_unlock_irqrestore(&info->port.lock, flags);
mutex_unlock(&info->port.mutex);
wake_up_interruptible(&info->port.open_wait);
}
/* Set new termios settings
*/
static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
tty->driver->name );
change_params(info);
/* Handle transition to B0 status */
if (old_termios->c_cflag & CBAUD &&
!(tty->termios.c_cflag & CBAUD)) {
info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
spin_lock_irqsave(&info->lock,flags);
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/* Handle transition away from B0 status */
if (!(old_termios->c_cflag & CBAUD) &&
tty->termios.c_cflag & CBAUD) {
info->serial_signals |= SerialSignal_DTR;
if (!(tty->termios.c_cflag & CRTSCTS) ||
!test_bit(TTY_THROTTLED, &tty->flags)) {
info->serial_signals |= SerialSignal_RTS;
}
spin_lock_irqsave(&info->lock,flags);
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/* Handle turning off CRTSCTS */
if (old_termios->c_cflag & CRTSCTS &&
!(tty->termios.c_cflag & CRTSCTS)) {
tty->hw_stopped = 0;
tx_release(tty);
}
}
/* Send a block of data
*
* Arguments:
*
* tty pointer to tty information structure
* buf pointer to buffer containing send data
* count size of send data in bytes
*
* Return Value: number of characters written
*/
static int write(struct tty_struct *tty,
const unsigned char *buf, int count)
{
int c, ret = 0;
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s write() count=%d\n",
__FILE__,__LINE__,info->device_name,count);
if (sanity_check(info, tty->name, "write"))
goto cleanup;
if (!info->tx_buf)
goto cleanup;
if (info->params.mode == MGSL_MODE_HDLC) {
if (count > info->max_frame_size) {
ret = -EIO;
goto cleanup;
}
if (info->tx_active)
goto cleanup;
if (info->tx_count) {
/* send accumulated data from send_char() calls */
/* as frame and wait before accepting more data. */
tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
goto start;
}
ret = info->tx_count = count;
tx_load_dma_buffer(info, buf, count);
goto start;
}
for (;;) {
c = min_t(int, count,
min(info->max_frame_size - info->tx_count - 1,
info->max_frame_size - info->tx_put));
if (c <= 0)
break;
memcpy(info->tx_buf + info->tx_put, buf, c);
spin_lock_irqsave(&info->lock,flags);
info->tx_put += c;
if (info->tx_put >= info->max_frame_size)
info->tx_put -= info->max_frame_size;
info->tx_count += c;
spin_unlock_irqrestore(&info->lock,flags);
buf += c;
count -= c;
ret += c;
}
if (info->params.mode == MGSL_MODE_HDLC) {
if (count) {
ret = info->tx_count = 0;
goto cleanup;
}
tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
}
start:
if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_active)
tx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
cleanup:
if (debug_level >= DEBUG_LEVEL_INFO)
printk( "%s(%d):%s write() returning=%d\n",
__FILE__,__LINE__,info->device_name,ret);
return ret;
}
/* Add a character to the transmit buffer.
*/
static int put_char(struct tty_struct *tty, unsigned char ch)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
int ret = 0;
if ( debug_level >= DEBUG_LEVEL_INFO ) {
printk( "%s(%d):%s put_char(%d)\n",
__FILE__,__LINE__,info->device_name,ch);
}
if (sanity_check(info, tty->name, "put_char"))
return 0;
if (!info->tx_buf)
return 0;
spin_lock_irqsave(&info->lock,flags);
if ( (info->params.mode != MGSL_MODE_HDLC) ||
!info->tx_active ) {
if (info->tx_count < info->max_frame_size - 1) {
info->tx_buf[info->tx_put++] = ch;
if (info->tx_put >= info->max_frame_size)
info->tx_put -= info->max_frame_size;
info->tx_count++;
ret = 1;
}
}
spin_unlock_irqrestore(&info->lock,flags);
return ret;
}
/* Send a high-priority XON/XOFF character
*/
static void send_xchar(struct tty_struct *tty, char ch)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s send_xchar(%d)\n",
__FILE__,__LINE__, info->device_name, ch );
if (sanity_check(info, tty->name, "send_xchar"))
return;
info->x_char = ch;
if (ch) {
/* Make sure transmit interrupts are on */
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_enabled)
tx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
}
/* Wait until the transmitter is empty.
*/
static void wait_until_sent(struct tty_struct *tty, int timeout)
{
SLMP_INFO * info = tty->driver_data;
unsigned long orig_jiffies, char_time;
if (!info )
return;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s wait_until_sent() entry\n",
__FILE__,__LINE__, info->device_name );
if (sanity_check(info, tty->name, "wait_until_sent"))
return;
if (!test_bit(ASYNCB_INITIALIZED, &info->port.flags))
goto exit;
orig_jiffies = jiffies;
/* Set check interval to 1/5 of estimated time to
* send a character, and make it at least 1. The check
* interval should also be less than the timeout.
* Note: use tight timings here to satisfy the NIST-PCTS.
*/
if ( info->params.data_rate ) {
char_time = info->timeout/(32 * 5);
if (!char_time)
char_time++;
} else
char_time = 1;
if (timeout)
char_time = min_t(unsigned long, char_time, timeout);
if ( info->params.mode == MGSL_MODE_HDLC ) {
while (info->tx_active) {
msleep_interruptible(jiffies_to_msecs(char_time));
if (signal_pending(current))
break;
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
}
} else {
/*
* TODO: determine if there is something similar to USC16C32
* TXSTATUS_ALL_SENT status
*/
while ( info->tx_active && info->tx_enabled) {
msleep_interruptible(jiffies_to_msecs(char_time));
if (signal_pending(current))
break;
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
}
}
exit:
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s wait_until_sent() exit\n",
__FILE__,__LINE__, info->device_name );
}
/* Return the count of free bytes in transmit buffer
*/
static int write_room(struct tty_struct *tty)
{
SLMP_INFO *info = tty->driver_data;
int ret;
if (sanity_check(info, tty->name, "write_room"))
return 0;
if (info->params.mode == MGSL_MODE_HDLC) {
ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
} else {
ret = info->max_frame_size - info->tx_count - 1;
if (ret < 0)
ret = 0;
}
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s write_room()=%d\n",
__FILE__, __LINE__, info->device_name, ret);
return ret;
}
/* enable transmitter and send remaining buffered characters
*/
static void flush_chars(struct tty_struct *tty)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
__FILE__,__LINE__,info->device_name,info->tx_count);
if (sanity_check(info, tty->name, "flush_chars"))
return;
if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
!info->tx_buf)
return;
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
__FILE__,__LINE__,info->device_name );
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_active) {
if ( (info->params.mode == MGSL_MODE_HDLC) &&
info->tx_count ) {
/* operating in synchronous (frame oriented) mode */
/* copy data from circular tx_buf to */
/* transmit DMA buffer. */
tx_load_dma_buffer(info,
info->tx_buf,info->tx_count);
}
tx_start(info);
}
spin_unlock_irqrestore(&info->lock,flags);
}
/* Discard all data in the send buffer
*/
static void flush_buffer(struct tty_struct *tty)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s flush_buffer() entry\n",
__FILE__,__LINE__, info->device_name );
if (sanity_check(info, tty->name, "flush_buffer"))
return;
spin_lock_irqsave(&info->lock,flags);
info->tx_count = info->tx_put = info->tx_get = 0;
del_timer(&info->tx_timer);
spin_unlock_irqrestore(&info->lock,flags);
tty_wakeup(tty);
}
/* throttle (stop) transmitter
*/
static void tx_hold(struct tty_struct *tty)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
if (sanity_check(info, tty->name, "tx_hold"))
return;
if ( debug_level >= DEBUG_LEVEL_INFO )
printk("%s(%d):%s tx_hold()\n",
__FILE__,__LINE__,info->device_name);
spin_lock_irqsave(&info->lock,flags);
if (info->tx_enabled)
tx_stop(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/* release (start) transmitter
*/
static void tx_release(struct tty_struct *tty)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
if (sanity_check(info, tty->name, "tx_release"))
return;
if ( debug_level >= DEBUG_LEVEL_INFO )
printk("%s(%d):%s tx_release()\n",
__FILE__,__LINE__,info->device_name);
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_enabled)
tx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/* Service an IOCTL request
*
* Arguments:
*
* tty pointer to tty instance data
* cmd IOCTL command code
* arg command argument/context
*
* Return Value: 0 if success, otherwise error code
*/
static int ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
SLMP_INFO *info = tty->driver_data;
void __user *argp = (void __user *)arg;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
info->device_name, cmd );
if (sanity_check(info, tty->name, "ioctl"))
return -ENODEV;
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
(cmd != TIOCMIWAIT)) {
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
}
switch (cmd) {
case MGSL_IOCGPARAMS:
return get_params(info, argp);
case MGSL_IOCSPARAMS:
return set_params(info, argp);
case MGSL_IOCGTXIDLE:
return get_txidle(info, argp);
case MGSL_IOCSTXIDLE:
return set_txidle(info, (int)arg);
case MGSL_IOCTXENABLE:
return tx_enable(info, (int)arg);
case MGSL_IOCRXENABLE:
return rx_enable(info, (int)arg);
case MGSL_IOCTXABORT:
return tx_abort(info);
case MGSL_IOCGSTATS:
return get_stats(info, argp);
case MGSL_IOCWAITEVENT:
return wait_mgsl_event(info, argp);
case MGSL_IOCLOOPTXDONE:
return 0; // TODO: Not supported, need to document
/* Wait for modem input (DCD,RI,DSR,CTS) change
* as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
*/
case TIOCMIWAIT:
return modem_input_wait(info,(int)arg);
/*
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
* Return: write counters to the user passed counter struct
* NB: both 1->0 and 0->1 transitions are counted except for
* RI where only 0->1 is counted.
*/
default:
return -ENOIOCTLCMD;
}
return 0;
}
static int get_icount(struct tty_struct *tty,
struct serial_icounter_struct *icount)
{
SLMP_INFO *info = tty->driver_data;
struct mgsl_icount cnow; /* kernel counter temps */
unsigned long flags;
spin_lock_irqsave(&info->lock,flags);
cnow = info->icount;
spin_unlock_irqrestore(&info->lock,flags);
icount->cts = cnow.cts;
icount->dsr = cnow.dsr;
icount->rng = cnow.rng;
icount->dcd = cnow.dcd;
icount->rx = cnow.rx;
icount->tx = cnow.tx;
icount->frame = cnow.frame;
icount->overrun = cnow.overrun;
icount->parity = cnow.parity;
icount->brk = cnow.brk;
icount->buf_overrun = cnow.buf_overrun;
return 0;
}
/*
* /proc fs routines....
*/
static inline void line_info(struct seq_file *m, SLMP_INFO *info)
{
char stat_buf[30];
unsigned long flags;
seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
"\tIRQ=%d MaxFrameSize=%u\n",
info->device_name,
info->phys_sca_base,
info->phys_memory_base,
info->phys_statctrl_base,
info->phys_lcr_base,
info->irq_level,
info->max_frame_size );
/* output current serial signal states */
spin_lock_irqsave(&info->lock,flags);
get_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
stat_buf[0] = 0;
stat_buf[1] = 0;
if (info->serial_signals & SerialSignal_RTS)
strcat(stat_buf, "|RTS");
if (info->serial_signals & SerialSignal_CTS)
strcat(stat_buf, "|CTS");
if (info->serial_signals & SerialSignal_DTR)
strcat(stat_buf, "|DTR");
if (info->serial_signals & SerialSignal_DSR)
strcat(stat_buf, "|DSR");
if (info->serial_signals & SerialSignal_DCD)
strcat(stat_buf, "|CD");
if (info->serial_signals & SerialSignal_RI)
strcat(stat_buf, "|RI");
if (info->params.mode == MGSL_MODE_HDLC) {
seq_printf(m, "\tHDLC txok:%d rxok:%d",
info->icount.txok, info->icount.rxok);
if (info->icount.txunder)
seq_printf(m, " txunder:%d", info->icount.txunder);
if (info->icount.txabort)
seq_printf(m, " txabort:%d", info->icount.txabort);
if (info->icount.rxshort)
seq_printf(m, " rxshort:%d", info->icount.rxshort);
if (info->icount.rxlong)
seq_printf(m, " rxlong:%d", info->icount.rxlong);
if (info->icount.rxover)
seq_printf(m, " rxover:%d", info->icount.rxover);
if (info->icount.rxcrc)
seq_printf(m, " rxlong:%d", info->icount.rxcrc);
} else {
seq_printf(m, "\tASYNC tx:%d rx:%d",
info->icount.tx, info->icount.rx);
if (info->icount.frame)
seq_printf(m, " fe:%d", info->icount.frame);
if (info->icount.parity)
seq_printf(m, " pe:%d", info->icount.parity);
if (info->icount.brk)
seq_printf(m, " brk:%d", info->icount.brk);
if (info->icount.overrun)
seq_printf(m, " oe:%d", info->icount.overrun);
}
/* Append serial signal status to end */
seq_printf(m, " %s\n", stat_buf+1);
seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
info->tx_active,info->bh_requested,info->bh_running,
info->pending_bh);
}
/* Called to print information about devices
*/
static int synclinkmp_proc_show(struct seq_file *m, void *v)
{
SLMP_INFO *info;
seq_printf(m, "synclinkmp driver:%s\n", driver_version);
info = synclinkmp_device_list;
while( info ) {
line_info(m, info);
info = info->next_device;
}
return 0;
}
static int synclinkmp_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, synclinkmp_proc_show, NULL);
}
static const struct file_operations synclinkmp_proc_fops = {
.owner = THIS_MODULE,
.open = synclinkmp_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/* Return the count of bytes in transmit buffer
*/
static int chars_in_buffer(struct tty_struct *tty)
{
SLMP_INFO *info = tty->driver_data;
if (sanity_check(info, tty->name, "chars_in_buffer"))
return 0;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s chars_in_buffer()=%d\n",
__FILE__, __LINE__, info->device_name, info->tx_count);
return info->tx_count;
}
/* Signal remote device to throttle send data (our receive data)
*/
static void throttle(struct tty_struct * tty)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s throttle() entry\n",
__FILE__,__LINE__, info->device_name );
if (sanity_check(info, tty->name, "throttle"))
return;
if (I_IXOFF(tty))
send_xchar(tty, STOP_CHAR(tty));
if (tty->termios.c_cflag & CRTSCTS) {
spin_lock_irqsave(&info->lock,flags);
info->serial_signals &= ~SerialSignal_RTS;
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
}
}
/* Signal remote device to stop throttling send data (our receive data)
*/
static void unthrottle(struct tty_struct * tty)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s unthrottle() entry\n",
__FILE__,__LINE__, info->device_name );
if (sanity_check(info, tty->name, "unthrottle"))
return;
if (I_IXOFF(tty)) {
if (info->x_char)
info->x_char = 0;
else
send_xchar(tty, START_CHAR(tty));
}
if (tty->termios.c_cflag & CRTSCTS) {
spin_lock_irqsave(&info->lock,flags);
info->serial_signals |= SerialSignal_RTS;
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
}
}
/* set or clear transmit break condition
* break_state -1=set break condition, 0=clear
*/
static int set_break(struct tty_struct *tty, int break_state)
{
unsigned char RegValue;
SLMP_INFO * info = tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s set_break(%d)\n",
__FILE__,__LINE__, info->device_name, break_state);
if (sanity_check(info, tty->name, "set_break"))
return -EINVAL;
spin_lock_irqsave(&info->lock,flags);
RegValue = read_reg(info, CTL);
if (break_state == -1)
RegValue |= BIT3;
else
RegValue &= ~BIT3;
write_reg(info, CTL, RegValue);
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
#if SYNCLINK_GENERIC_HDLC
/**
* called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
* set encoding and frame check sequence (FCS) options
*
* dev pointer to network device structure
* encoding serial encoding setting
* parity FCS setting
*
* returns 0 if success, otherwise error code
*/
static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
unsigned short parity)
{
SLMP_INFO *info = dev_to_port(dev);
unsigned char new_encoding;
unsigned short new_crctype;
/* return error if TTY interface open */
if (info->port.count)
return -EBUSY;
switch (encoding)
{
case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
default: return -EINVAL;
}
switch (parity)
{
case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
default: return -EINVAL;
}
info->params.encoding = new_encoding;
info->params.crc_type = new_crctype;
/* if network interface up, reprogram hardware */
if (info->netcount)
program_hw(info);
return 0;
}
/**
* called by generic HDLC layer to send frame
*
* skb socket buffer containing HDLC frame
* dev pointer to network device structure
*/
static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
struct net_device *dev)
{
SLMP_INFO *info = dev_to_port(dev);
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
/* stop sending until this frame completes */
netif_stop_queue(dev);
/* copy data to device buffers */
info->tx_count = skb->len;
tx_load_dma_buffer(info, skb->data, skb->len);
/* update network statistics */
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
/* done with socket buffer, so free it */
dev_kfree_skb(skb);
/* save start time for transmit timeout detection */
dev->trans_start = jiffies;
/* start hardware transmitter if necessary */
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_active)
tx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
return NETDEV_TX_OK;
}
/**
* called by network layer when interface enabled
* claim resources and initialize hardware
*
* dev pointer to network device structure
*
* returns 0 if success, otherwise error code
*/
static int hdlcdev_open(struct net_device *dev)
{
SLMP_INFO *info = dev_to_port(dev);
int rc;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
/* generic HDLC layer open processing */
if ((rc = hdlc_open(dev)))
return rc;
/* arbitrate between network and tty opens */
spin_lock_irqsave(&info->netlock, flags);
if (info->port.count != 0 || info->netcount != 0) {
printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
spin_unlock_irqrestore(&info->netlock, flags);
return -EBUSY;
}
info->netcount=1;
spin_unlock_irqrestore(&info->netlock, flags);
/* claim resources and init adapter */
if ((rc = startup(info)) != 0) {
spin_lock_irqsave(&info->netlock, flags);
info->netcount=0;
spin_unlock_irqrestore(&info->netlock, flags);
return rc;
}
/* assert RTS and DTR, apply hardware settings */
info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
program_hw(info);
/* enable network layer transmit */
dev->trans_start = jiffies;
netif_start_queue(dev);
/* inform generic HDLC layer of current DCD status */
spin_lock_irqsave(&info->lock, flags);
get_signals(info);
spin_unlock_irqrestore(&info->lock, flags);
if (info->serial_signals & SerialSignal_DCD)
netif_carrier_on(dev);
else
netif_carrier_off(dev);
return 0;
}
/**
* called by network layer when interface is disabled
* shutdown hardware and release resources
*
* dev pointer to network device structure
*
* returns 0 if success, otherwise error code
*/
static int hdlcdev_close(struct net_device *dev)
{
SLMP_INFO *info = dev_to_port(dev);
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
netif_stop_queue(dev);
/* shutdown adapter and release resources */
shutdown(info);
hdlc_close(dev);
spin_lock_irqsave(&info->netlock, flags);
info->netcount=0;
spin_unlock_irqrestore(&info->netlock, flags);
return 0;
}
/**
* called by network layer to process IOCTL call to network device
*
* dev pointer to network device structure
* ifr pointer to network interface request structure
* cmd IOCTL command code
*
* returns 0 if success, otherwise error code
*/
static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
const size_t size = sizeof(sync_serial_settings);
sync_serial_settings new_line;
sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
SLMP_INFO *info = dev_to_port(dev);
unsigned int flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
/* return error if TTY interface open */
if (info->port.count)
return -EBUSY;
if (cmd != SIOCWANDEV)
return hdlc_ioctl(dev, ifr, cmd);
switch(ifr->ifr_settings.type) {
case IF_GET_IFACE: /* return current sync_serial_settings */
ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
if (ifr->ifr_settings.size < size) {
ifr->ifr_settings.size = size; /* data size wanted */
return -ENOBUFS;
}
flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
switch (flags){
case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
default: new_line.clock_type = CLOCK_DEFAULT;
}
new_line.clock_rate = info->params.clock_speed;
new_line.loopback = info->params.loopback ? 1:0;
if (copy_to_user(line, &new_line, size))
return -EFAULT;
return 0;
case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
if(!capable(CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(&new_line, line, size))
return -EFAULT;
switch (new_line.clock_type)
{
case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
case CLOCK_DEFAULT: flags = info->params.flags &
(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
default: return -EINVAL;
}
if (new_line.loopback != 0 && new_line.loopback != 1)
return -EINVAL;
info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
info->params.flags |= flags;
info->params.loopback = new_line.loopback;
if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
info->params.clock_speed = new_line.clock_rate;
else
info->params.clock_speed = 0;
/* if network interface up, reprogram hardware */
if (info->netcount)
program_hw(info);
return 0;
default:
return hdlc_ioctl(dev, ifr, cmd);
}
}
/**
* called by network layer when transmit timeout is detected
*
* dev pointer to network device structure
*/
static void hdlcdev_tx_timeout(struct net_device *dev)
{
SLMP_INFO *info = dev_to_port(dev);
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("hdlcdev_tx_timeout(%s)\n",dev->name);
dev->stats.tx_errors++;
dev->stats.tx_aborted_errors++;
spin_lock_irqsave(&info->lock,flags);
tx_stop(info);
spin_unlock_irqrestore(&info->lock,flags);
netif_wake_queue(dev);
}
/**
* called by device driver when transmit completes
* reenable network layer transmit if stopped
*
* info pointer to device instance information
*/
static void hdlcdev_tx_done(SLMP_INFO *info)
{
if (netif_queue_stopped(info->netdev))
netif_wake_queue(info->netdev);
}
/**
* called by device driver when frame received
* pass frame to network layer
*
* info pointer to device instance information
* buf pointer to buffer contianing frame data
* size count of data bytes in buf
*/
static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
{
struct sk_buff *skb = dev_alloc_skb(size);
struct net_device *dev = info->netdev;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("hdlcdev_rx(%s)\n",dev->name);
if (skb == NULL) {
printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
dev->name);
dev->stats.rx_dropped++;
return;
}
memcpy(skb_put(skb, size), buf, size);
skb->protocol = hdlc_type_trans(skb, dev);
dev->stats.rx_packets++;
dev->stats.rx_bytes += size;
netif_rx(skb);
}
static const struct net_device_ops hdlcdev_ops = {
.ndo_open = hdlcdev_open,
.ndo_stop = hdlcdev_close,
.ndo_change_mtu = hdlc_change_mtu,
.ndo_start_xmit = hdlc_start_xmit,
.ndo_do_ioctl = hdlcdev_ioctl,
.ndo_tx_timeout = hdlcdev_tx_timeout,
};
/**
* called by device driver when adding device instance
* do generic HDLC initialization
*
* info pointer to device instance information
*
* returns 0 if success, otherwise error code
*/
static int hdlcdev_init(SLMP_INFO *info)
{
int rc;
struct net_device *dev;
hdlc_device *hdlc;
/* allocate and initialize network and HDLC layer objects */
if (!(dev = alloc_hdlcdev(info))) {
printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
return -ENOMEM;
}
/* for network layer reporting purposes only */
dev->mem_start = info->phys_sca_base;
dev->mem_end = info->phys_sca_base + SCA_BASE_SIZE - 1;
dev->irq = info->irq_level;
/* network layer callbacks and settings */
dev->netdev_ops = &hdlcdev_ops;
dev->watchdog_timeo = 10 * HZ;
dev->tx_queue_len = 50;
/* generic HDLC layer callbacks and settings */
hdlc = dev_to_hdlc(dev);
hdlc->attach = hdlcdev_attach;
hdlc->xmit = hdlcdev_xmit;
/* register objects with HDLC layer */
if ((rc = register_hdlc_device(dev))) {
printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
free_netdev(dev);
return rc;
}
info->netdev = dev;
return 0;
}
/**
* called by device driver when removing device instance
* do generic HDLC cleanup
*
* info pointer to device instance information
*/
static void hdlcdev_exit(SLMP_INFO *info)
{
unregister_hdlc_device(info->netdev);
free_netdev(info->netdev);
info->netdev = NULL;
}
#endif /* CONFIG_HDLC */
/* Return next bottom half action to perform.
* Return Value: BH action code or 0 if nothing to do.
*/
static int bh_action(SLMP_INFO *info)
{
unsigned long flags;
int rc = 0;
spin_lock_irqsave(&info->lock,flags);
if (info->pending_bh & BH_RECEIVE) {
info->pending_bh &= ~BH_RECEIVE;
rc = BH_RECEIVE;
} else if (info->pending_bh & BH_TRANSMIT) {
info->pending_bh &= ~BH_TRANSMIT;
rc = BH_TRANSMIT;
} else if (info->pending_bh & BH_STATUS) {
info->pending_bh &= ~BH_STATUS;
rc = BH_STATUS;
}
if (!rc) {
/* Mark BH routine as complete */
info->bh_running = false;
info->bh_requested = false;
}
spin_unlock_irqrestore(&info->lock,flags);
return rc;
}
/* Perform bottom half processing of work items queued by ISR.
*/
static void bh_handler(struct work_struct *work)
{
SLMP_INFO *info = container_of(work, SLMP_INFO, task);
int action;
if ( debug_level >= DEBUG_LEVEL_BH )
printk( "%s(%d):%s bh_handler() entry\n",
__FILE__,__LINE__,info->device_name);
info->bh_running = true;
while((action = bh_action(info)) != 0) {
/* Process work item */
if ( debug_level >= DEBUG_LEVEL_BH )
printk( "%s(%d):%s bh_handler() work item action=%d\n",
__FILE__,__LINE__,info->device_name, action);
switch (action) {
case BH_RECEIVE:
bh_receive(info);
break;
case BH_TRANSMIT:
bh_transmit(info);
break;
case BH_STATUS:
bh_status(info);
break;
default:
/* unknown work item ID */
printk("%s(%d):%s Unknown work item ID=%08X!\n",
__FILE__,__LINE__,info->device_name,action);
break;
}
}
if ( debug_level >= DEBUG_LEVEL_BH )
printk( "%s(%d):%s bh_handler() exit\n",
__FILE__,__LINE__,info->device_name);
}
static void bh_receive(SLMP_INFO *info)
{
if ( debug_level >= DEBUG_LEVEL_BH )
printk( "%s(%d):%s bh_receive()\n",
__FILE__,__LINE__,info->device_name);
while( rx_get_frame(info) );
}
static void bh_transmit(SLMP_INFO *info)
{
struct tty_struct *tty = info->port.tty;
if ( debug_level >= DEBUG_LEVEL_BH )
printk( "%s(%d):%s bh_transmit() entry\n",
__FILE__,__LINE__,info->device_name);
if (tty)
tty_wakeup(tty);
}
static void bh_status(SLMP_INFO *info)
{
if ( debug_level >= DEBUG_LEVEL_BH )
printk( "%s(%d):%s bh_status() entry\n",
__FILE__,__LINE__,info->device_name);
info->ri_chkcount = 0;
info->dsr_chkcount = 0;
info->dcd_chkcount = 0;
info->cts_chkcount = 0;
}
static void isr_timer(SLMP_INFO * info)
{
unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
/* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
write_reg(info, IER2, 0);
/* TMCS, Timer Control/Status Register
*
* 07 CMF, Compare match flag (read only) 1=match
* 06 ECMI, CMF Interrupt Enable: 0=disabled
* 05 Reserved, must be 0
* 04 TME, Timer Enable
* 03..00 Reserved, must be 0
*
* 0000 0000
*/
write_reg(info, (unsigned char)(timer + TMCS), 0);
info->irq_occurred = true;
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s isr_timer()\n",
__FILE__,__LINE__,info->device_name);
}
static void isr_rxint(SLMP_INFO * info)
{
struct tty_struct *tty = info->port.tty;
struct mgsl_icount *icount = &info->icount;
unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
/* clear status bits */
if (status)
write_reg(info, SR1, status);
if (status2)
write_reg(info, SR2, status2);
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s isr_rxint status=%02X %02x\n",
__FILE__,__LINE__,info->device_name,status,status2);
if (info->params.mode == MGSL_MODE_ASYNC) {
if (status & BRKD) {
icount->brk++;
/* process break detection if tty control
* is not set to ignore it
*/
if (!(status & info->ignore_status_mask1)) {
if (info->read_status_mask1 & BRKD) {
tty_insert_flip_char(&info->port, 0, TTY_BREAK);
if (tty && (info->port.flags & ASYNC_SAK))
do_SAK(tty);
}
}
}
}
else {
if (status & (FLGD|IDLD)) {
if (status & FLGD)
info->icount.exithunt++;
else if (status & IDLD)
info->icount.rxidle++;
wake_up_interruptible(&info->event_wait_q);
}
}
if (status & CDCD) {
/* simulate a common modem status change interrupt
* for our handler
*/
get_signals( info );
isr_io_pin(info,
MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
}
}
/*
* handle async rx data interrupts
*/
static void isr_rxrdy(SLMP_INFO * info)
{
u16 status;
unsigned char DataByte;
struct mgsl_icount *icount = &info->icount;
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s isr_rxrdy\n",
__FILE__,__LINE__,info->device_name);
while((status = read_reg(info,CST0)) & BIT0)
{
int flag = 0;
bool over = false;
DataByte = read_reg(info,TRB);
icount->rx++;
if ( status & (PE + FRME + OVRN) ) {
printk("%s(%d):%s rxerr=%04X\n",
__FILE__,__LINE__,info->device_name,status);
/* update error statistics */
if (status & PE)
icount->parity++;
else if (status & FRME)
icount->frame++;
else if (status & OVRN)
icount->overrun++;
/* discard char if tty control flags say so */
if (status & info->ignore_status_mask2)
continue;
status &= info->read_status_mask2;
if (status & PE)
flag = TTY_PARITY;
else if (status & FRME)
flag = TTY_FRAME;
if (status & OVRN) {
/* Overrun is special, since it's
* reported immediately, and doesn't
* affect the current character
*/
over = true;
}
} /* end of if (error) */
tty_insert_flip_char(&info->port, DataByte, flag);
if (over)
tty_insert_flip_char(&info->port, 0, TTY_OVERRUN);
}
if ( debug_level >= DEBUG_LEVEL_ISR ) {
printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
__FILE__,__LINE__,info->device_name,
icount->rx,icount->brk,icount->parity,
icount->frame,icount->overrun);
}
tty_flip_buffer_push(&info->port);
}
static void isr_txeom(SLMP_INFO * info, unsigned char status)
{
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s isr_txeom status=%02x\n",
__FILE__,__LINE__,info->device_name,status);
write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
if (status & UDRN) {
write_reg(info, CMD, TXRESET);
write_reg(info, CMD, TXENABLE);
} else
write_reg(info, CMD, TXBUFCLR);
/* disable and clear tx interrupts */
info->ie0_value &= ~TXRDYE;
info->ie1_value &= ~(IDLE + UDRN);
write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
if ( info->tx_active ) {
if (info->params.mode != MGSL_MODE_ASYNC) {
if (status & UDRN)
info->icount.txunder++;
else if (status & IDLE)
info->icount.txok++;
}
info->tx_active = false;
info->tx_count = info->tx_put = info->tx_get = 0;
del_timer(&info->tx_timer);
if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
info->serial_signals &= ~SerialSignal_RTS;
info->drop_rts_on_tx_done = false;
set_signals(info);
}
#if SYNCLINK_GENERIC_HDLC
if (info->netcount)
hdlcdev_tx_done(info);
else
#endif
{
if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
tx_stop(info);
return;
}
info->pending_bh |= BH_TRANSMIT;
}
}
}
/*
* handle tx status interrupts
*/
static void isr_txint(SLMP_INFO * info)
{
unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
/* clear status bits */
write_reg(info, SR1, status);
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s isr_txint status=%02x\n",
__FILE__,__LINE__,info->device_name,status);
if (status & (UDRN + IDLE))
isr_txeom(info, status);
if (status & CCTS) {
/* simulate a common modem status change interrupt
* for our handler
*/
get_signals( info );
isr_io_pin(info,
MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
}
}
/*
* handle async tx data interrupts
*/
static void isr_txrdy(SLMP_INFO * info)
{
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
__FILE__,__LINE__,info->device_name,info->tx_count);
if (info->params.mode != MGSL_MODE_ASYNC) {
/* disable TXRDY IRQ, enable IDLE IRQ */
info->ie0_value &= ~TXRDYE;
info->ie1_value |= IDLE;
write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
return;
}
if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
tx_stop(info);
return;
}
if ( info->tx_count )
tx_load_fifo( info );
else {
info->tx_active = false;
info->ie0_value &= ~TXRDYE;
write_reg(info, IE0, info->ie0_value);
}
if (info->tx_count < WAKEUP_CHARS)
info->pending_bh |= BH_TRANSMIT;
}
static void isr_rxdmaok(SLMP_INFO * info)
{
/* BIT7 = EOT (end of transfer)
* BIT6 = EOM (end of message/frame)
*/
unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
/* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
__FILE__,__LINE__,info->device_name,status);
info->pending_bh |= BH_RECEIVE;
}
static void isr_rxdmaerror(SLMP_INFO * info)
{
/* BIT5 = BOF (buffer overflow)
* BIT4 = COF (counter overflow)
*/
unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
/* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
__FILE__,__LINE__,info->device_name,status);
info->rx_overflow = true;
info->pending_bh |= BH_RECEIVE;
}
static void isr_txdmaok(SLMP_INFO * info)
{
unsigned char status_reg1 = read_reg(info, SR1);
write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
__FILE__,__LINE__,info->device_name,status_reg1);
/* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
write_reg16(info, TRC0, 0);
info->ie0_value |= TXRDYE;
write_reg(info, IE0, info->ie0_value);
}
static void isr_txdmaerror(SLMP_INFO * info)
{
/* BIT5 = BOF (buffer overflow)
* BIT4 = COF (counter overflow)
*/
unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
/* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
__FILE__,__LINE__,info->device_name,status);
}
/* handle input serial signal changes
*/
static void isr_io_pin( SLMP_INFO *info, u16 status )
{
struct mgsl_icount *icount;
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):isr_io_pin status=%04X\n",
__FILE__,__LINE__,status);
if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
icount = &info->icount;
/* update input line counters */
if (status & MISCSTATUS_RI_LATCHED) {
icount->rng++;
if ( status & SerialSignal_RI )
info->input_signal_events.ri_up++;
else
info->input_signal_events.ri_down++;
}
if (status & MISCSTATUS_DSR_LATCHED) {
icount->dsr++;
if ( status & SerialSignal_DSR )
info->input_signal_events.dsr_up++;
else
info->input_signal_events.dsr_down++;
}
if (status & MISCSTATUS_DCD_LATCHED) {
if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
info->ie1_value &= ~CDCD;
write_reg(info, IE1, info->ie1_value);
}
icount->dcd++;
if (status & SerialSignal_DCD) {
info->input_signal_events.dcd_up++;
} else
info->input_signal_events.dcd_down++;
#if SYNCLINK_GENERIC_HDLC
if (info->netcount) {
if (status & SerialSignal_DCD)
netif_carrier_on(info->netdev);
else
netif_carrier_off(info->netdev);
}
#endif
}
if (status & MISCSTATUS_CTS_LATCHED)
{
if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
info->ie1_value &= ~CCTS;
write_reg(info, IE1, info->ie1_value);
}
icount->cts++;
if ( status & SerialSignal_CTS )
info->input_signal_events.cts_up++;
else
info->input_signal_events.cts_down++;
}
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
if ( (info->port.flags & ASYNC_CHECK_CD) &&
(status & MISCSTATUS_DCD_LATCHED) ) {
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s CD now %s...", info->device_name,
(status & SerialSignal_DCD) ? "on" : "off");
if (status & SerialSignal_DCD)
wake_up_interruptible(&info->port.open_wait);
else {
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("doing serial hangup...");
if (info->port.tty)
tty_hangup(info->port.tty);
}
}
if (tty_port_cts_enabled(&info->port) &&
(status & MISCSTATUS_CTS_LATCHED) ) {
if ( info->port.tty ) {
if (info->port.tty->hw_stopped) {
if (status & SerialSignal_CTS) {
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("CTS tx start...");
info->port.tty->hw_stopped = 0;
tx_start(info);
info->pending_bh |= BH_TRANSMIT;
return;
}
} else {
if (!(status & SerialSignal_CTS)) {
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("CTS tx stop...");
info->port.tty->hw_stopped = 1;
tx_stop(info);
}
}
}
}
}
info->pending_bh |= BH_STATUS;
}
/* Interrupt service routine entry point.
*
* Arguments:
* irq interrupt number that caused interrupt
* dev_id device ID supplied during interrupt registration
* regs interrupted processor context
*/
static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
{
SLMP_INFO *info = dev_id;
unsigned char status, status0, status1=0;
unsigned char dmastatus, dmastatus0, dmastatus1=0;
unsigned char timerstatus0, timerstatus1=0;
unsigned char shift;
unsigned int i;
unsigned short tmp;
if ( debug_level >= DEBUG_LEVEL_ISR )
printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
__FILE__, __LINE__, info->irq_level);
spin_lock(&info->lock);
for(;;) {
/* get status for SCA0 (ports 0-1) */
tmp = read_reg16(info, ISR0); /* get ISR0 and ISR1 in one read */
status0 = (unsigned char)tmp;
dmastatus0 = (unsigned char)(tmp>>8);
timerstatus0 = read_reg(info, ISR2);
if ( debug_level >= DEBUG_LEVEL_ISR )
printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
__FILE__, __LINE__, info->device_name,
status0, dmastatus0, timerstatus0);
if (info->port_count == 4) {
/* get status for SCA1 (ports 2-3) */
tmp = read_reg16(info->port_array[2], ISR0);
status1 = (unsigned char)tmp;
dmastatus1 = (unsigned char)(tmp>>8);
timerstatus1 = read_reg(info->port_array[2], ISR2);
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
__FILE__,__LINE__,info->device_name,
status1,dmastatus1,timerstatus1);
}
if (!status0 && !dmastatus0 && !timerstatus0 &&
!status1 && !dmastatus1 && !timerstatus1)
break;
for(i=0; i < info->port_count ; i++) {
if (info->port_array[i] == NULL)
continue;
if (i < 2) {
status = status0;
dmastatus = dmastatus0;
} else {
status = status1;
dmastatus = dmastatus1;
}
shift = i & 1 ? 4 :0;
if (status & BIT0 << shift)
isr_rxrdy(info->port_array[i]);
if (status & BIT1 << shift)
isr_txrdy(info->port_array[i]);
if (status & BIT2 << shift)
isr_rxint(info->port_array[i]);
if (status & BIT3 << shift)
isr_txint(info->port_array[i]);
if (dmastatus & BIT0 << shift)
isr_rxdmaerror(info->port_array[i]);
if (dmastatus & BIT1 << shift)
isr_rxdmaok(info->port_array[i]);
if (dmastatus & BIT2 << shift)
isr_txdmaerror(info->port_array[i]);
if (dmastatus & BIT3 << shift)
isr_txdmaok(info->port_array[i]);
}
if (timerstatus0 & (BIT5 | BIT4))
isr_timer(info->port_array[0]);
if (timerstatus0 & (BIT7 | BIT6))
isr_timer(info->port_array[1]);
if (timerstatus1 & (BIT5 | BIT4))
isr_timer(info->port_array[2]);
if (timerstatus1 & (BIT7 | BIT6))
isr_timer(info->port_array[3]);
}
for(i=0; i < info->port_count ; i++) {
SLMP_INFO * port = info->port_array[i];
/* Request bottom half processing if there's something
* for it to do and the bh is not already running.
*
* Note: startup adapter diags require interrupts.
* do not request bottom half processing if the
* device is not open in a normal mode.
*/
if ( port && (port->port.count || port->netcount) &&
port->pending_bh && !port->bh_running &&
!port->bh_requested ) {
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s queueing bh task.\n",
__FILE__,__LINE__,port->device_name);
schedule_work(&port->task);
port->bh_requested = true;
}
}
spin_unlock(&info->lock);
if ( debug_level >= DEBUG_LEVEL_ISR )
printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
__FILE__, __LINE__, info->irq_level);
return IRQ_HANDLED;
}
/* Initialize and start device.
*/
static int startup(SLMP_INFO * info)
{
if ( debug_level >= DEBUG_LEVEL_INFO )
printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
if (info->port.flags & ASYNC_INITIALIZED)
return 0;
if (!info->tx_buf) {
info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
if (!info->tx_buf) {
printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
__FILE__,__LINE__,info->device_name);
return -ENOMEM;
}
}
info->pending_bh = 0;
memset(&info->icount, 0, sizeof(info->icount));
/* program hardware for current parameters */
reset_port(info);
change_params(info);
mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
if (info->port.tty)
clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
info->port.flags |= ASYNC_INITIALIZED;
return 0;
}
/* Called by close() and hangup() to shutdown hardware
*/
static void shutdown(SLMP_INFO * info)
{
unsigned long flags;
if (!(info->port.flags & ASYNC_INITIALIZED))
return;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s synclinkmp_shutdown()\n",
__FILE__,__LINE__, info->device_name );
/* clear status wait queue because status changes */
/* can't happen after shutting down the hardware */
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
del_timer(&info->tx_timer);
del_timer(&info->status_timer);
kfree(info->tx_buf);
info->tx_buf = NULL;
spin_lock_irqsave(&info->lock,flags);
reset_port(info);
if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
set_signals(info);
}
spin_unlock_irqrestore(&info->lock,flags);
if (info->port.tty)
set_bit(TTY_IO_ERROR, &info->port.tty->flags);
info->port.flags &= ~ASYNC_INITIALIZED;
}
static void program_hw(SLMP_INFO *info)
{
unsigned long flags;
spin_lock_irqsave(&info->lock,flags);
rx_stop(info);
tx_stop(info);
info->tx_count = info->tx_put = info->tx_get = 0;
if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
hdlc_mode(info);
else
async_mode(info);
set_signals(info);
info->dcd_chkcount = 0;
info->cts_chkcount = 0;
info->ri_chkcount = 0;
info->dsr_chkcount = 0;
info->ie1_value |= (CDCD|CCTS);
write_reg(info, IE1, info->ie1_value);
get_signals(info);
if (info->netcount || (info->port.tty && info->port.tty->termios.c_cflag & CREAD) )
rx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/* Reconfigure adapter based on new parameters
*/
static void change_params(SLMP_INFO *info)
{
unsigned cflag;
int bits_per_char;
if (!info->port.tty)
return;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s change_params()\n",
__FILE__,__LINE__, info->device_name );
cflag = info->port.tty->termios.c_cflag;
/* if B0 rate (hangup) specified then negate RTS and DTR */
/* otherwise assert RTS and DTR */
if (cflag & CBAUD)
info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
else
info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
/* byte size and parity */
switch (cflag & CSIZE) {
case CS5: info->params.data_bits = 5; break;
case CS6: info->params.data_bits = 6; break;
case CS7: info->params.data_bits = 7; break;
case CS8: info->params.data_bits = 8; break;
/* Never happens, but GCC is too dumb to figure it out */
default: info->params.data_bits = 7; break;
}
if (cflag & CSTOPB)
info->params.stop_bits = 2;
else
info->params.stop_bits = 1;
info->params.parity = ASYNC_PARITY_NONE;
if (cflag & PARENB) {
if (cflag & PARODD)
info->params.parity = ASYNC_PARITY_ODD;
else
info->params.parity = ASYNC_PARITY_EVEN;
#ifdef CMSPAR
if (cflag & CMSPAR)
info->params.parity = ASYNC_PARITY_SPACE;
#endif
}
/* calculate number of jiffies to transmit a full
* FIFO (32 bytes) at specified data rate
*/
bits_per_char = info->params.data_bits +
info->params.stop_bits + 1;
/* if port data rate is set to 460800 or less then
* allow tty settings to override, otherwise keep the
* current data rate.
*/
if (info->params.data_rate <= 460800) {
info->params.data_rate = tty_get_baud_rate(info->port.tty);
}
if ( info->params.data_rate ) {
info->timeout = (32*HZ*bits_per_char) /
info->params.data_rate;
}
info->timeout += HZ/50; /* Add .02 seconds of slop */
if (cflag & CRTSCTS)
info->port.flags |= ASYNC_CTS_FLOW;
else
info->port.flags &= ~ASYNC_CTS_FLOW;
if (cflag & CLOCAL)
info->port.flags &= ~ASYNC_CHECK_CD;
else
info->port.flags |= ASYNC_CHECK_CD;
/* process tty input control flags */
info->read_status_mask2 = OVRN;
if (I_INPCK(info->port.tty))
info->read_status_mask2 |= PE | FRME;
if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
info->read_status_mask1 |= BRKD;
if (I_IGNPAR(info->port.tty))
info->ignore_status_mask2 |= PE | FRME;
if (I_IGNBRK(info->port.tty)) {
info->ignore_status_mask1 |= BRKD;
/* If ignoring parity and break indicators, ignore
* overruns too. (For real raw support).
*/
if (I_IGNPAR(info->port.tty))
info->ignore_status_mask2 |= OVRN;
}
program_hw(info);
}
static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
{
int err;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s get_params()\n",
__FILE__,__LINE__, info->device_name);
if (!user_icount) {
memset(&info->icount, 0, sizeof(info->icount));
} else {
mutex_lock(&info->port.mutex);
COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
mutex_unlock(&info->port.mutex);
if (err)
return -EFAULT;
}
return 0;
}
static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
{
int err;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s get_params()\n",
__FILE__,__LINE__, info->device_name);
mutex_lock(&info->port.mutex);
COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
mutex_unlock(&info->port.mutex);
if (err) {
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):%s get_params() user buffer copy failed\n",
__FILE__,__LINE__,info->device_name);
return -EFAULT;
}
return 0;
}
static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
{
unsigned long flags;
MGSL_PARAMS tmp_params;
int err;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s set_params\n",
__FILE__,__LINE__,info->device_name );
COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
if (err) {
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):%s set_params() user buffer copy failed\n",
__FILE__,__LINE__,info->device_name);
return -EFAULT;
}
mutex_lock(&info->port.mutex);
spin_lock_irqsave(&info->lock,flags);
memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
spin_unlock_irqrestore(&info->lock,flags);
change_params(info);
mutex_unlock(&info->port.mutex);
return 0;
}
static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
{
int err;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s get_txidle()=%d\n",
__FILE__,__LINE__, info->device_name, info->idle_mode);
COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
if (err) {
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
__FILE__,__LINE__,info->device_name);
return -EFAULT;
}
return 0;
}
static int set_txidle(SLMP_INFO * info, int idle_mode)
{
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s set_txidle(%d)\n",
__FILE__,__LINE__,info->device_name, idle_mode );
spin_lock_irqsave(&info->lock,flags);
info->idle_mode = idle_mode;
tx_set_idle( info );
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
static int tx_enable(SLMP_INFO * info, int enable)
{
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s tx_enable(%d)\n",
__FILE__,__LINE__,info->device_name, enable);
spin_lock_irqsave(&info->lock,flags);
if ( enable ) {
if ( !info->tx_enabled ) {
tx_start(info);
}
} else {
if ( info->tx_enabled )
tx_stop(info);
}
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
/* abort send HDLC frame
*/
static int tx_abort(SLMP_INFO * info)
{
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s tx_abort()\n",
__FILE__,__LINE__,info->device_name);
spin_lock_irqsave(&info->lock,flags);
if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
info->ie1_value &= ~UDRN;
info->ie1_value |= IDLE;
write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
write_reg(info, CMD, TXABORT);
}
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
static int rx_enable(SLMP_INFO * info, int enable)
{
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s rx_enable(%d)\n",
__FILE__,__LINE__,info->device_name,enable);
spin_lock_irqsave(&info->lock,flags);
if ( enable ) {
if ( !info->rx_enabled )
rx_start(info);
} else {
if ( info->rx_enabled )
rx_stop(info);
}
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
/* wait for specified event to occur
*/
static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
{
unsigned long flags;
int s;
int rc=0;
struct mgsl_icount cprev, cnow;
int events;
int mask;
struct _input_signal_events oldsigs, newsigs;
DECLARE_WAITQUEUE(wait, current);
COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
if (rc) {
return -EFAULT;
}
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s wait_mgsl_event(%d)\n",
__FILE__,__LINE__,info->device_name,mask);
spin_lock_irqsave(&info->lock,flags);
/* return immediately if state matches requested events */
get_signals(info);
s = info->serial_signals;
events = mask &
( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
if (events) {
spin_unlock_irqrestore(&info->lock,flags);
goto exit;
}
/* save current irq counts */
cprev = info->icount;
oldsigs = info->input_signal_events;
/* enable hunt and idle irqs if needed */
if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
unsigned char oldval = info->ie1_value;
unsigned char newval = oldval +
(mask & MgslEvent_ExitHuntMode ? FLGD:0) +
(mask & MgslEvent_IdleReceived ? IDLD:0);
if ( oldval != newval ) {
info->ie1_value = newval;
write_reg(info, IE1, info->ie1_value);
}
}
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&info->event_wait_q, &wait);
spin_unlock_irqrestore(&info->lock,flags);
for(;;) {
schedule();
if (signal_pending(current)) {
rc = -ERESTARTSYS;
break;
}
/* get current irq counts */
spin_lock_irqsave(&info->lock,flags);
cnow = info->icount;
newsigs = info->input_signal_events;
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(&info->lock,flags);
/* if no change, wait aborted for some reason */
if (newsigs.dsr_up == oldsigs.dsr_up &&
newsigs.dsr_down == oldsigs.dsr_down &&
newsigs.dcd_up == oldsigs.dcd_up &&
newsigs.dcd_down == oldsigs.dcd_down &&
newsigs.cts_up == oldsigs.cts_up &&
newsigs.cts_down == oldsigs.cts_down &&
newsigs.ri_up == oldsigs.ri_up &&
newsigs.ri_down == oldsigs.ri_down &&
cnow.exithunt == cprev.exithunt &&
cnow.rxidle == cprev.rxidle) {
rc = -EIO;
break;
}
events = mask &
( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
(newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
(newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
(newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
(newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
(newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
(newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
(newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
(cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
(cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
if (events)
break;
cprev = cnow;
oldsigs = newsigs;
}
remove_wait_queue(&info->event_wait_q, &wait);
set_current_state(TASK_RUNNING);
if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
spin_lock_irqsave(&info->lock,flags);
if (!waitqueue_active(&info->event_wait_q)) {
/* disable enable exit hunt mode/idle rcvd IRQs */
info->ie1_value &= ~(FLGD|IDLD);
write_reg(info, IE1, info->ie1_value);
}
spin_unlock_irqrestore(&info->lock,flags);
}
exit:
if ( rc == 0 )
PUT_USER(rc, events, mask_ptr);
return rc;
}
static int modem_input_wait(SLMP_INFO *info,int arg)
{
unsigned long flags;
int rc;
struct mgsl_icount cprev, cnow;
DECLARE_WAITQUEUE(wait, current);
/* save current irq counts */
spin_lock_irqsave(&info->lock,flags);
cprev = info->icount;
add_wait_queue(&info->status_event_wait_q, &wait);
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(&info->lock,flags);
for(;;) {
schedule();
if (signal_pending(current)) {
rc = -ERESTARTSYS;
break;
}
/* get new irq counts */
spin_lock_irqsave(&info->lock,flags);
cnow = info->icount;
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(&info->lock,flags);
/* if no change, wait aborted for some reason */
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
rc = -EIO;
break;
}
/* check for change in caller specified modem input */
if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
(arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
(arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
(arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
rc = 0;
break;
}
cprev = cnow;
}
remove_wait_queue(&info->status_event_wait_q, &wait);
set_current_state(TASK_RUNNING);
return rc;
}
/* return the state of the serial control and status signals
*/
static int tiocmget(struct tty_struct *tty)
{
SLMP_INFO *info = tty->driver_data;
unsigned int result;
unsigned long flags;
spin_lock_irqsave(&info->lock,flags);
get_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS : 0) |
((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR : 0) |
((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR : 0) |
((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG : 0) |
((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR : 0) |
((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS : 0);
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s tiocmget() value=%08X\n",
__FILE__,__LINE__, info->device_name, result );
return result;
}
/* set modem control signals (DTR/RTS)
*/
static int tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s tiocmset(%x,%x)\n",
__FILE__,__LINE__,info->device_name, set, clear);
if (set & TIOCM_RTS)
info->serial_signals |= SerialSignal_RTS;
if (set & TIOCM_DTR)
info->serial_signals |= SerialSignal_DTR;
if (clear & TIOCM_RTS)
info->serial_signals &= ~SerialSignal_RTS;
if (clear & TIOCM_DTR)
info->serial_signals &= ~SerialSignal_DTR;
spin_lock_irqsave(&info->lock,flags);
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
static int carrier_raised(struct tty_port *port)
{
SLMP_INFO *info = container_of(port, SLMP_INFO, port);
unsigned long flags;
spin_lock_irqsave(&info->lock,flags);
get_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
}
static void dtr_rts(struct tty_port *port, int on)
{
SLMP_INFO *info = container_of(port, SLMP_INFO, port);
unsigned long flags;
spin_lock_irqsave(&info->lock,flags);
if (on)
info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
else
info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/* Block the current process until the specified port is ready to open.
*/
static int block_til_ready(struct tty_struct *tty, struct file *filp,
SLMP_INFO *info)
{
DECLARE_WAITQUEUE(wait, current);
int retval;
bool do_clocal = false;
bool extra_count = false;
unsigned long flags;
int cd;
struct tty_port *port = &info->port;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s block_til_ready()\n",
__FILE__,__LINE__, tty->driver->name );
if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
/* nonblock mode is set or port is not enabled */
/* just verify that callout device is not active */
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
if (tty->termios.c_cflag & CLOCAL)
do_clocal = true;
/* Wait for carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
* this loop, port->count is dropped by one, so that
* close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&port->open_wait, &wait);
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s block_til_ready() before block, count=%d\n",
__FILE__,__LINE__, tty->driver->name, port->count );
spin_lock_irqsave(&info->lock, flags);
if (!tty_hung_up_p(filp)) {
extra_count = true;
port->count--;
}
spin_unlock_irqrestore(&info->lock, flags);
port->blocked_open++;
while (1) {
if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
tty_port_raise_dtr_rts(port);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
retval = (port->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS;
break;
}
cd = tty_port_carrier_raised(port);
if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd))
break;
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s block_til_ready() count=%d\n",
__FILE__,__LINE__, tty->driver->name, port->count );
tty_unlock(tty);
schedule();
tty_lock(tty);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&port->open_wait, &wait);
if (extra_count)
port->count++;
port->blocked_open--;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s block_til_ready() after, count=%d\n",
__FILE__,__LINE__, tty->driver->name, port->count );
if (!retval)
port->flags |= ASYNC_NORMAL_ACTIVE;
return retval;
}
static int alloc_dma_bufs(SLMP_INFO *info)
{
unsigned short BuffersPerFrame;
unsigned short BufferCount;
// Force allocation to start at 64K boundary for each port.
// This is necessary because *all* buffer descriptors for a port
// *must* be in the same 64K block. All descriptors on a port
// share a common 'base' address (upper 8 bits of 24 bits) programmed
// into the CBP register.
info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
/* Calculate the number of DMA buffers necessary to hold the */
/* largest allowable frame size. Note: If the max frame size is */
/* not an even multiple of the DMA buffer size then we need to */
/* round the buffer count per frame up one. */
BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
if ( info->max_frame_size % SCABUFSIZE )
BuffersPerFrame++;
/* calculate total number of data buffers (SCABUFSIZE) possible
* in one ports memory (SCA_MEM_SIZE/4) after allocating memory
* for the descriptor list (BUFFERLISTSIZE).
*/
BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
/* limit number of buffers to maximum amount of descriptors */
if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
/* use enough buffers to transmit one max size frame */
info->tx_buf_count = BuffersPerFrame + 1;
/* never use more than half the available buffers for transmit */
if (info->tx_buf_count > (BufferCount/2))
info->tx_buf_count = BufferCount/2;
if (info->tx_buf_count > SCAMAXDESC)
info->tx_buf_count = SCAMAXDESC;
/* use remaining buffers for receive */
info->rx_buf_count = BufferCount - info->tx_buf_count;
if (info->rx_buf_count > SCAMAXDESC)
info->rx_buf_count = SCAMAXDESC;
if ( debug_level >= DEBUG_LEVEL_INFO )
printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
__FILE__,__LINE__, info->device_name,
info->tx_buf_count,info->rx_buf_count);
if ( alloc_buf_list( info ) < 0 ||
alloc_frame_bufs(info,
info->rx_buf_list,
info->rx_buf_list_ex,
info->rx_buf_count) < 0 ||
alloc_frame_bufs(info,
info->tx_buf_list,
info->tx_buf_list_ex,
info->tx_buf_count) < 0 ||
alloc_tmp_rx_buf(info) < 0 ) {
printk("%s(%d):%s Can't allocate DMA buffer memory\n",
__FILE__,__LINE__, info->device_name);
return -ENOMEM;
}
rx_reset_buffers( info );
return 0;
}
/* Allocate DMA buffers for the transmit and receive descriptor lists.
*/
static int alloc_buf_list(SLMP_INFO *info)
{
unsigned int i;
/* build list in adapter shared memory */
info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
memset(info->buffer_list, 0, BUFFERLISTSIZE);
/* Save virtual address pointers to the receive and */
/* transmit buffer lists. (Receive 1st). These pointers will */
/* be used by the processor to access the lists. */
info->rx_buf_list = (SCADESC *)info->buffer_list;
info->tx_buf_list = (SCADESC *)info->buffer_list;
info->tx_buf_list += info->rx_buf_count;
/* Build links for circular buffer entry lists (tx and rx)
*
* Note: links are physical addresses read by the SCA device
* to determine the next buffer entry to use.
*/
for ( i = 0; i < info->rx_buf_count; i++ ) {
/* calculate and store physical address of this buffer entry */
info->rx_buf_list_ex[i].phys_entry =
info->buffer_list_phys + (i * SCABUFSIZE);
/* calculate and store physical address of */
/* next entry in cirular list of entries */
info->rx_buf_list[i].next = info->buffer_list_phys;
if ( i < info->rx_buf_count - 1 )
info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
info->rx_buf_list[i].length = SCABUFSIZE;
}
for ( i = 0; i < info->tx_buf_count; i++ ) {
/* calculate and store physical address of this buffer entry */
info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
((info->rx_buf_count + i) * sizeof(SCADESC));
/* calculate and store physical address of */
/* next entry in cirular list of entries */
info->tx_buf_list[i].next = info->buffer_list_phys +
info->rx_buf_count * sizeof(SCADESC);
if ( i < info->tx_buf_count - 1 )
info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
}
return 0;
}
/* Allocate the frame DMA buffers used by the specified buffer list.
*/
static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
{
int i;
unsigned long phys_addr;
for ( i = 0; i < count; i++ ) {
buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
phys_addr = info->port_array[0]->last_mem_alloc;
info->port_array[0]->last_mem_alloc += SCABUFSIZE;
buf_list[i].buf_ptr = (unsigned short)phys_addr;
buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
}
return 0;
}
static void free_dma_bufs(SLMP_INFO *info)
{
info->buffer_list = NULL;
info->rx_buf_list = NULL;
info->tx_buf_list = NULL;
}
/* allocate buffer large enough to hold max_frame_size.
* This buffer is used to pass an assembled frame to the line discipline.
*/
static int alloc_tmp_rx_buf(SLMP_INFO *info)
{
info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
if (info->tmp_rx_buf == NULL)
return -ENOMEM;
/* unused flag buffer to satisfy receive_buf calling interface */
info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
if (!info->flag_buf) {
kfree(info->tmp_rx_buf);
info->tmp_rx_buf = NULL;
return -ENOMEM;
}
return 0;
}
static void free_tmp_rx_buf(SLMP_INFO *info)
{
kfree(info->tmp_rx_buf);
info->tmp_rx_buf = NULL;
kfree(info->flag_buf);
info->flag_buf = NULL;
}
static int claim_resources(SLMP_INFO *info)
{
if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
__FILE__,__LINE__,info->device_name, info->phys_memory_base);
info->init_error = DiagStatus_AddressConflict;
goto errout;
}
else
info->shared_mem_requested = true;
if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
__FILE__,__LINE__,info->device_name, info->phys_lcr_base);
info->init_error = DiagStatus_AddressConflict;
goto errout;
}
else
info->lcr_mem_requested = true;
if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
__FILE__,__LINE__,info->device_name, info->phys_sca_base);
info->init_error = DiagStatus_AddressConflict;
goto errout;
}
else
info->sca_base_requested = true;
if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
__FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
info->init_error = DiagStatus_AddressConflict;
goto errout;
}
else
info->sca_statctrl_requested = true;
info->memory_base = ioremap_nocache(info->phys_memory_base,
SCA_MEM_SIZE);
if (!info->memory_base) {
printk( "%s(%d):%s Can't map shared memory, MemAddr=%08X\n",
__FILE__,__LINE__,info->device_name, info->phys_memory_base );
info->init_error = DiagStatus_CantAssignPciResources;
goto errout;
}
info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
if (!info->lcr_base) {
printk( "%s(%d):%s Can't map LCR memory, MemAddr=%08X\n",
__FILE__,__LINE__,info->device_name, info->phys_lcr_base );
info->init_error = DiagStatus_CantAssignPciResources;
goto errout;
}
info->lcr_base += info->lcr_offset;
info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
if (!info->sca_base) {
printk( "%s(%d):%s Can't map SCA memory, MemAddr=%08X\n",
__FILE__,__LINE__,info->device_name, info->phys_sca_base );
info->init_error = DiagStatus_CantAssignPciResources;
goto errout;
}
info->sca_base += info->sca_offset;
info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
PAGE_SIZE);
if (!info->statctrl_base) {
printk( "%s(%d):%s Can't map SCA Status/Control memory, MemAddr=%08X\n",
__FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
info->init_error = DiagStatus_CantAssignPciResources;
goto errout;
}
info->statctrl_base += info->statctrl_offset;
if ( !memory_test(info) ) {
printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
__FILE__,__LINE__,info->device_name, info->phys_memory_base );
info->init_error = DiagStatus_MemoryError;
goto errout;
}
return 0;
errout:
release_resources( info );
return -ENODEV;
}
static void release_resources(SLMP_INFO *info)
{
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):%s release_resources() entry\n",
__FILE__,__LINE__,info->device_name );
if ( info->irq_requested ) {
free_irq(info->irq_level, info);
info->irq_requested = false;
}
if ( info->shared_mem_requested ) {
release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
info->shared_mem_requested = false;
}
if ( info->lcr_mem_requested ) {
release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
info->lcr_mem_requested = false;
}
if ( info->sca_base_requested ) {
release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
info->sca_base_requested = false;
}
if ( info->sca_statctrl_requested ) {
release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
info->sca_statctrl_requested = false;
}
if (info->memory_base){
iounmap(info->memory_base);
info->memory_base = NULL;
}
if (info->sca_base) {
iounmap(info->sca_base - info->sca_offset);
info->sca_base=NULL;
}
if (info->statctrl_base) {
iounmap(info->statctrl_base - info->statctrl_offset);
info->statctrl_base=NULL;
}
if (info->lcr_base){
iounmap(info->lcr_base - info->lcr_offset);
info->lcr_base = NULL;
}
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):%s release_resources() exit\n",
__FILE__,__LINE__,info->device_name );
}
/* Add the specified device instance data structure to the
* global linked list of devices and increment the device count.
*/
static void add_device(SLMP_INFO *info)
{
info->next_device = NULL;
info->line = synclinkmp_device_count;
sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
if (info->line < MAX_DEVICES) {
if (maxframe[info->line])
info->max_frame_size = maxframe[info->line];
}
synclinkmp_device_count++;
if ( !synclinkmp_device_list )
synclinkmp_device_list = info;
else {
SLMP_INFO *current_dev = synclinkmp_device_list;
while( current_dev->next_device )
current_dev = current_dev->next_device;
current_dev->next_device = info;
}
if ( info->max_frame_size < 4096 )
info->max_frame_size = 4096;
else if ( info->max_frame_size > 65535 )
info->max_frame_size = 65535;
printk( "SyncLink MultiPort %s: "
"Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
info->device_name,
info->phys_sca_base,
info->phys_memory_base,
info->phys_statctrl_base,
info->phys_lcr_base,
info->irq_level,
info->max_frame_size );
#if SYNCLINK_GENERIC_HDLC
hdlcdev_init(info);
#endif
}
static const struct tty_port_operations port_ops = {
.carrier_raised = carrier_raised,
.dtr_rts = dtr_rts,
};
/* Allocate and initialize a device instance structure
*
* Return Value: pointer to SLMP_INFO if success, otherwise NULL
*/
static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
{
SLMP_INFO *info;
info = kzalloc(sizeof(SLMP_INFO),
GFP_KERNEL);
if (!info) {
printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
__FILE__,__LINE__, adapter_num, port_num);
} else {
tty_port_init(&info->port);
info->port.ops = &port_ops;
info->magic = MGSL_MAGIC;
INIT_WORK(&info->task, bh_handler);
info->max_frame_size = 4096;
info->port.close_delay = 5*HZ/10;
info->port.closing_wait = 30*HZ;
init_waitqueue_head(&info->status_event_wait_q);
init_waitqueue_head(&info->event_wait_q);
spin_lock_init(&info->netlock);
memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
info->idle_mode = HDLC_TXIDLE_FLAGS;
info->adapter_num = adapter_num;
info->port_num = port_num;
/* Copy configuration info to device instance data */
info->irq_level = pdev->irq;
info->phys_lcr_base = pci_resource_start(pdev,0);
info->phys_sca_base = pci_resource_start(pdev,2);
info->phys_memory_base = pci_resource_start(pdev,3);
info->phys_statctrl_base = pci_resource_start(pdev,4);
/* Because veremap only works on page boundaries we must map
* a larger area than is actually implemented for the LCR
* memory range. We map a full page starting at the page boundary.
*/
info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
info->phys_lcr_base &= ~(PAGE_SIZE-1);
info->sca_offset = info->phys_sca_base & (PAGE_SIZE-1);
info->phys_sca_base &= ~(PAGE_SIZE-1);
info->statctrl_offset = info->phys_statctrl_base & (PAGE_SIZE-1);
info->phys_statctrl_base &= ~(PAGE_SIZE-1);
info->bus_type = MGSL_BUS_TYPE_PCI;
info->irq_flags = IRQF_SHARED;
setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
setup_timer(&info->status_timer, status_timeout,
(unsigned long)info);
/* Store the PCI9050 misc control register value because a flaw
* in the PCI9050 prevents LCR registers from being read if
* BIOS assigns an LCR base address with bit 7 set.
*
* Only the misc control register is accessed for which only
* write access is needed, so set an initial value and change
* bits to the device instance data as we write the value
* to the actual misc control register.
*/
info->misc_ctrl_value = 0x087e4546;
/* initial port state is unknown - if startup errors
* occur, init_error will be set to indicate the
* problem. Once the port is fully initialized,
* this value will be set to 0 to indicate the
* port is available.
*/
info->init_error = -1;
}
return info;
}
static void device_init(int adapter_num, struct pci_dev *pdev)
{
SLMP_INFO *port_array[SCA_MAX_PORTS];
int port;
/* allocate device instances for up to SCA_MAX_PORTS devices */
for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
port_array[port] = alloc_dev(adapter_num,port,pdev);
if( port_array[port] == NULL ) {
for (--port; port >= 0; --port) {
tty_port_destroy(&port_array[port]->port);
kfree(port_array[port]);
}
return;
}
}
/* give copy of port_array to all ports and add to device list */
for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
add_device( port_array[port] );
spin_lock_init(&port_array[port]->lock);
}
/* Allocate and claim adapter resources */
if ( !claim_resources(port_array[0]) ) {
alloc_dma_bufs(port_array[0]);
/* copy resource information from first port to others */
for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
port_array[port]->lock = port_array[0]->lock;
port_array[port]->irq_level = port_array[0]->irq_level;
port_array[port]->memory_base = port_array[0]->memory_base;
port_array[port]->sca_base = port_array[0]->sca_base;
port_array[port]->statctrl_base = port_array[0]->statctrl_base;
port_array[port]->lcr_base = port_array[0]->lcr_base;
alloc_dma_bufs(port_array[port]);
}
if ( request_irq(port_array[0]->irq_level,
synclinkmp_interrupt,
port_array[0]->irq_flags,
port_array[0]->device_name,
port_array[0]) < 0 ) {
printk( "%s(%d):%s Can't request interrupt, IRQ=%d\n",
__FILE__,__LINE__,
port_array[0]->device_name,
port_array[0]->irq_level );
}
else {
port_array[0]->irq_requested = true;
adapter_test(port_array[0]);
}
}
}
static const struct tty_operations ops = {
.install = install,
.open = open,
.close = close,
.write = write,
.put_char = put_char,
.flush_chars = flush_chars,
.write_room = write_room,
.chars_in_buffer = chars_in_buffer,
.flush_buffer = flush_buffer,
.ioctl = ioctl,
.throttle = throttle,
.unthrottle = unthrottle,
.send_xchar = send_xchar,
.break_ctl = set_break,
.wait_until_sent = wait_until_sent,
.set_termios = set_termios,
.stop = tx_hold,
.start = tx_release,
.hangup = hangup,
.tiocmget = tiocmget,
.tiocmset = tiocmset,
.get_icount = get_icount,
.proc_fops = &synclinkmp_proc_fops,
};
static void synclinkmp_cleanup(void)
{
int rc;
SLMP_INFO *info;
SLMP_INFO *tmp;
printk("Unloading %s %s\n", driver_name, driver_version);
if (serial_driver) {
if ((rc = tty_unregister_driver(serial_driver)))
printk("%s(%d) failed to unregister tty driver err=%d\n",
__FILE__,__LINE__,rc);
put_tty_driver(serial_driver);
}
/* reset devices */
info = synclinkmp_device_list;
while(info) {
reset_port(info);
info = info->next_device;
}
/* release devices */
info = synclinkmp_device_list;
while(info) {
#if SYNCLINK_GENERIC_HDLC
hdlcdev_exit(info);
#endif
free_dma_bufs(info);
free_tmp_rx_buf(info);
if ( info->port_num == 0 ) {
if (info->sca_base)
write_reg(info, LPR, 1); /* set low power mode */
release_resources(info);
}
tmp = info;
info = info->next_device;
tty_port_destroy(&tmp->port);
kfree(tmp);
}
pci_unregister_driver(&synclinkmp_pci_driver);
}
/* Driver initialization entry point.
*/
static int __init synclinkmp_init(void)
{
int rc;
if (break_on_load) {
synclinkmp_get_text_ptr();
BREAKPOINT();
}
printk("%s %s\n", driver_name, driver_version);
if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
return rc;
}
serial_driver = alloc_tty_driver(128);
if (!serial_driver) {
rc = -ENOMEM;
goto error;
}
/* Initialize the tty_driver structure */
serial_driver->driver_name = "synclinkmp";
serial_driver->name = "ttySLM";
serial_driver->major = ttymajor;
serial_driver->minor_start = 64;
serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
serial_driver->subtype = SERIAL_TYPE_NORMAL;
serial_driver->init_termios = tty_std_termios;
serial_driver->init_termios.c_cflag =
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
serial_driver->init_termios.c_ispeed = 9600;
serial_driver->init_termios.c_ospeed = 9600;
serial_driver->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(serial_driver, &ops);
if ((rc = tty_register_driver(serial_driver)) < 0) {
printk("%s(%d):Couldn't register serial driver\n",
__FILE__,__LINE__);
put_tty_driver(serial_driver);
serial_driver = NULL;
goto error;
}
printk("%s %s, tty major#%d\n",
driver_name, driver_version,
serial_driver->major);
return 0;
error:
synclinkmp_cleanup();
return rc;
}
static void __exit synclinkmp_exit(void)
{
synclinkmp_cleanup();
}
module_init(synclinkmp_init);
module_exit(synclinkmp_exit);
/* Set the port for internal loopback mode.
* The TxCLK and RxCLK signals are generated from the BRG and
* the TxD is looped back to the RxD internally.
*/
static void enable_loopback(SLMP_INFO *info, int enable)
{
if (enable) {
/* MD2 (Mode Register 2)
* 01..00 CNCT<1..0> Channel Connection 11=Local Loopback
*/
write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
/* degate external TxC clock source */
info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
write_control_reg(info);
/* RXS/TXS (Rx/Tx clock source)
* 07 Reserved, must be 0
* 06..04 Clock Source, 100=BRG
* 03..00 Clock Divisor, 0000=1
*/
write_reg(info, RXS, 0x40);
write_reg(info, TXS, 0x40);
} else {
/* MD2 (Mode Register 2)
* 01..00 CNCT<1..0> Channel connection, 0=normal
*/
write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
/* RXS/TXS (Rx/Tx clock source)
* 07 Reserved, must be 0
* 06..04 Clock Source, 000=RxC/TxC Pin
* 03..00 Clock Divisor, 0000=1
*/
write_reg(info, RXS, 0x00);
write_reg(info, TXS, 0x00);
}
/* set LinkSpeed if available, otherwise default to 2Mbps */
if (info->params.clock_speed)
set_rate(info, info->params.clock_speed);
else
set_rate(info, 3686400);
}
/* Set the baud rate register to the desired speed
*
* data_rate data rate of clock in bits per second
* A data rate of 0 disables the AUX clock.
*/
static void set_rate( SLMP_INFO *info, u32 data_rate )
{
u32 TMCValue;
unsigned char BRValue;
u32 Divisor=0;
/* fBRG = fCLK/(TMC * 2^BR)
*/
if (data_rate != 0) {
Divisor = 14745600/data_rate;
if (!Divisor)
Divisor = 1;
TMCValue = Divisor;
BRValue = 0;
if (TMCValue != 1 && TMCValue != 2) {
/* BRValue of 0 provides 50/50 duty cycle *only* when
* TMCValue is 1 or 2. BRValue of 1 to 9 always provides
* 50/50 duty cycle.
*/
BRValue = 1;
TMCValue >>= 1;
}
/* while TMCValue is too big for TMC register, divide
* by 2 and increment BR exponent.
*/
for(; TMCValue > 256 && BRValue < 10; BRValue++)
TMCValue >>= 1;
write_reg(info, TXS,
(unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
write_reg(info, RXS,
(unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
write_reg(info, TMC, (unsigned char)TMCValue);
}
else {
write_reg(info, TXS,0);
write_reg(info, RXS,0);
write_reg(info, TMC, 0);
}
}
/* Disable receiver
*/
static void rx_stop(SLMP_INFO *info)
{
if (debug_level >= DEBUG_LEVEL_ISR)
printk("%s(%d):%s rx_stop()\n",
__FILE__,__LINE__, info->device_name );
write_reg(info, CMD, RXRESET);
info->ie0_value &= ~RXRDYE;
write_reg(info, IE0, info->ie0_value); /* disable Rx data interrupts */
write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
write_reg(info, RXDMA + DIR, 0); /* disable Rx DMA interrupts */
info->rx_enabled = false;
info->rx_overflow = false;
}
/* enable the receiver
*/
static void rx_start(SLMP_INFO *info)
{
int i;
if (debug_level >= DEBUG_LEVEL_ISR)
printk("%s(%d):%s rx_start()\n",
__FILE__,__LINE__, info->device_name );
write_reg(info, CMD, RXRESET);
if ( info->params.mode == MGSL_MODE_HDLC ) {
/* HDLC, disabe IRQ on rxdata */
info->ie0_value &= ~RXRDYE;
write_reg(info, IE0, info->ie0_value);
/* Reset all Rx DMA buffers and program rx dma */
write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
for (i = 0; i < info->rx_buf_count; i++) {
info->rx_buf_list[i].status = 0xff;
// throttle to 4 shared memory writes at a time to prevent
// hogging local bus (keep latency time for DMA requests low).
if (!(i % 4))
read_status_reg(info);
}
info->current_rx_buf = 0;
/* set current/1st descriptor address */
write_reg16(info, RXDMA + CDA,
info->rx_buf_list_ex[0].phys_entry);
/* set new last rx descriptor address */
write_reg16(info, RXDMA + EDA,
info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
/* set buffer length (shared by all rx dma data buffers) */
write_reg16(info, RXDMA + BFL, SCABUFSIZE);
write_reg(info, RXDMA + DIR, 0x60); /* enable Rx DMA interrupts (EOM/BOF) */
write_reg(info, RXDMA + DSR, 0xf2); /* clear Rx DMA IRQs, enable Rx DMA */
} else {
/* async, enable IRQ on rxdata */
info->ie0_value |= RXRDYE;
write_reg(info, IE0, info->ie0_value);
}
write_reg(info, CMD, RXENABLE);
info->rx_overflow = false;
info->rx_enabled = true;
}
/* Enable the transmitter and send a transmit frame if
* one is loaded in the DMA buffers.
*/
static void tx_start(SLMP_INFO *info)
{
if (debug_level >= DEBUG_LEVEL_ISR)
printk("%s(%d):%s tx_start() tx_count=%d\n",
__FILE__,__LINE__, info->device_name,info->tx_count );
if (!info->tx_enabled ) {
write_reg(info, CMD, TXRESET);
write_reg(info, CMD, TXENABLE);
info->tx_enabled = true;
}
if ( info->tx_count ) {
/* If auto RTS enabled and RTS is inactive, then assert */
/* RTS and set a flag indicating that the driver should */
/* negate RTS when the transmission completes. */
info->drop_rts_on_tx_done = false;
if (info->params.mode != MGSL_MODE_ASYNC) {
if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
get_signals( info );
if ( !(info->serial_signals & SerialSignal_RTS) ) {
info->serial_signals |= SerialSignal_RTS;
set_signals( info );
info->drop_rts_on_tx_done = true;
}
}
write_reg16(info, TRC0,
(unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
/* set TX CDA (current descriptor address) */
write_reg16(info, TXDMA + CDA,
info->tx_buf_list_ex[0].phys_entry);
/* set TX EDA (last descriptor address) */
write_reg16(info, TXDMA + EDA,
info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
/* enable underrun IRQ */
info->ie1_value &= ~IDLE;
info->ie1_value |= UDRN;
write_reg(info, IE1, info->ie1_value);
write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
write_reg(info, TXDMA + DIR, 0x40); /* enable Tx DMA interrupts (EOM) */
write_reg(info, TXDMA + DSR, 0xf2); /* clear Tx DMA IRQs, enable Tx DMA */
mod_timer(&info->tx_timer, jiffies +
msecs_to_jiffies(5000));
}
else {
tx_load_fifo(info);
/* async, enable IRQ on txdata */
info->ie0_value |= TXRDYE;
write_reg(info, IE0, info->ie0_value);
}
info->tx_active = true;
}
}
/* stop the transmitter and DMA
*/
static void tx_stop( SLMP_INFO *info )
{
if (debug_level >= DEBUG_LEVEL_ISR)
printk("%s(%d):%s tx_stop()\n",
__FILE__,__LINE__, info->device_name );
del_timer(&info->tx_timer);
write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
write_reg(info, CMD, TXRESET);
info->ie1_value &= ~(UDRN + IDLE);
write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
info->ie0_value &= ~TXRDYE;
write_reg(info, IE0, info->ie0_value); /* disable tx data interrupts */
info->tx_enabled = false;
info->tx_active = false;
}
/* Fill the transmit FIFO until the FIFO is full or
* there is no more data to load.
*/
static void tx_load_fifo(SLMP_INFO *info)
{
u8 TwoBytes[2];
/* do nothing is now tx data available and no XON/XOFF pending */
if ( !info->tx_count && !info->x_char )
return;
/* load the Transmit FIFO until FIFOs full or all data sent */
while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
/* there is more space in the transmit FIFO and */
/* there is more data in transmit buffer */
if ( (info->tx_count > 1) && !info->x_char ) {
/* write 16-bits */
TwoBytes[0] = info->tx_buf[info->tx_get++];
if (info->tx_get >= info->max_frame_size)
info->tx_get -= info->max_frame_size;
TwoBytes[1] = info->tx_buf[info->tx_get++];
if (info->tx_get >= info->max_frame_size)
info->tx_get -= info->max_frame_size;
write_reg16(info, TRB, *((u16 *)TwoBytes));
info->tx_count -= 2;
info->icount.tx += 2;
} else {
/* only 1 byte left to transmit or 1 FIFO slot left */
if (info->x_char) {
/* transmit pending high priority char */
write_reg(info, TRB, info->x_char);
info->x_char = 0;
} else {
write_reg(info, TRB, info->tx_buf[info->tx_get++]);
if (info->tx_get >= info->max_frame_size)
info->tx_get -= info->max_frame_size;
info->tx_count--;
}
info->icount.tx++;
}
}
}
/* Reset a port to a known state
*/
static void reset_port(SLMP_INFO *info)
{
if (info->sca_base) {
tx_stop(info);
rx_stop(info);
info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
set_signals(info);
/* disable all port interrupts */
info->ie0_value = 0;
info->ie1_value = 0;
info->ie2_value = 0;
write_reg(info, IE0, info->ie0_value);
write_reg(info, IE1, info->ie1_value);
write_reg(info, IE2, info->ie2_value);
write_reg(info, CMD, CHRESET);
}
}
/* Reset all the ports to a known state.
*/
static void reset_adapter(SLMP_INFO *info)
{
int i;
for ( i=0; i < SCA_MAX_PORTS; ++i) {
if (info->port_array[i])
reset_port(info->port_array[i]);
}
}
/* Program port for asynchronous communications.
*/
static void async_mode(SLMP_INFO *info)
{
unsigned char RegValue;
tx_stop(info);
rx_stop(info);
/* MD0, Mode Register 0
*
* 07..05 PRCTL<2..0>, Protocol Mode, 000=async
* 04 AUTO, Auto-enable (RTS/CTS/DCD)
* 03 Reserved, must be 0
* 02 CRCCC, CRC Calculation, 0=disabled
* 01..00 STOP<1..0> Stop bits (00=1,10=2)
*
* 0000 0000
*/
RegValue = 0x00;
if (info->params.stop_bits != 1)
RegValue |= BIT1;
write_reg(info, MD0, RegValue);
/* MD1, Mode Register 1
*
* 07..06 BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
* 05..04 TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
* 03..02 RXCHR<1..0>, rx char size
* 01..00 PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
*
* 0100 0000
*/
RegValue = 0x40;
switch (info->params.data_bits) {
case 7: RegValue |= BIT4 + BIT2; break;
case 6: RegValue |= BIT5 + BIT3; break;
case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
}
if (info->params.parity != ASYNC_PARITY_NONE) {
RegValue |= BIT1;
if (info->params.parity == ASYNC_PARITY_ODD)
RegValue |= BIT0;
}
write_reg(info, MD1, RegValue);
/* MD2, Mode Register 2
*
* 07..02 Reserved, must be 0
* 01..00 CNCT<1..0> Channel connection, 00=normal 11=local loopback
*
* 0000 0000
*/
RegValue = 0x00;
if (info->params.loopback)
RegValue |= (BIT1 + BIT0);
write_reg(info, MD2, RegValue);
/* RXS, Receive clock source
*
* 07 Reserved, must be 0
* 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
* 03..00 RXBR<3..0>, rate divisor, 0000=1
*/
RegValue=BIT6;
write_reg(info, RXS, RegValue);
/* TXS, Transmit clock source
*
* 07 Reserved, must be 0
* 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
* 03..00 RXBR<3..0>, rate divisor, 0000=1
*/
RegValue=BIT6;
write_reg(info, TXS, RegValue);
/* Control Register
*
* 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
*/
info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
write_control_reg(info);
tx_set_idle(info);
/* RRC Receive Ready Control 0
*
* 07..05 Reserved, must be 0
* 04..00 RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
*/
write_reg(info, RRC, 0x00);
/* TRC0 Transmit Ready Control 0
*
* 07..05 Reserved, must be 0
* 04..00 TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
*/
write_reg(info, TRC0, 0x10);
/* TRC1 Transmit Ready Control 1
*
* 07..05 Reserved, must be 0
* 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
*/
write_reg(info, TRC1, 0x1e);
/* CTL, MSCI control register
*
* 07..06 Reserved, set to 0
* 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
* 04 IDLC, idle control, 0=mark 1=idle register
* 03 BRK, break, 0=off 1 =on (async)
* 02 SYNCLD, sync char load enable (BSC) 1=enabled
* 01 GOP, go active on poll (LOOP mode) 1=enabled
* 00 RTS, RTS output control, 0=active 1=inactive
*
* 0001 0001
*/
RegValue = 0x10;
if (!(info->serial_signals & SerialSignal_RTS))
RegValue |= 0x01;
write_reg(info, CTL, RegValue);
/* enable status interrupts */
info->ie0_value |= TXINTE + RXINTE;
write_reg(info, IE0, info->ie0_value);
/* enable break detect interrupt */
info->ie1_value = BRKD;
write_reg(info, IE1, info->ie1_value);
/* enable rx overrun interrupt */
info->ie2_value = OVRN;
write_reg(info, IE2, info->ie2_value);
set_rate( info, info->params.data_rate * 16 );
}
/* Program the SCA for HDLC communications.
*/
static void hdlc_mode(SLMP_INFO *info)
{
unsigned char RegValue;
u32 DpllDivisor;
// Can't use DPLL because SCA outputs recovered clock on RxC when
// DPLL mode selected. This causes output contention with RxC receiver.
// Use of DPLL would require external hardware to disable RxC receiver
// when DPLL mode selected.
info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
/* disable DMA interrupts */
write_reg(info, TXDMA + DIR, 0);
write_reg(info, RXDMA + DIR, 0);
/* MD0, Mode Register 0
*
* 07..05 PRCTL<2..0>, Protocol Mode, 100=HDLC
* 04 AUTO, Auto-enable (RTS/CTS/DCD)
* 03 Reserved, must be 0
* 02 CRCCC, CRC Calculation, 1=enabled
* 01 CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
* 00 CRC0, CRC initial value, 1 = all 1s
*
* 1000 0001
*/
RegValue = 0x81;
if (info->params.flags & HDLC_FLAG_AUTO_CTS)
RegValue |= BIT4;
if (info->params.flags & HDLC_FLAG_AUTO_DCD)
RegValue |= BIT4;
if (info->params.crc_type == HDLC_CRC_16_CCITT)
RegValue |= BIT2 + BIT1;
write_reg(info, MD0, RegValue);
/* MD1, Mode Register 1
*
* 07..06 ADDRS<1..0>, Address detect, 00=no addr check
* 05..04 TXCHR<1..0>, tx char size, 00=8 bits
* 03..02 RXCHR<1..0>, rx char size, 00=8 bits
* 01..00 PMPM<1..0>, Parity mode, 00=no parity
*
* 0000 0000
*/
RegValue = 0x00;
write_reg(info, MD1, RegValue);
/* MD2, Mode Register 2
*
* 07 NRZFM, 0=NRZ, 1=FM
* 06..05 CODE<1..0> Encoding, 00=NRZ
* 04..03 DRATE<1..0> DPLL Divisor, 00=8
* 02 Reserved, must be 0
* 01..00 CNCT<1..0> Channel connection, 0=normal
*
* 0000 0000
*/
RegValue = 0x00;
switch(info->params.encoding) {
case HDLC_ENCODING_NRZI: RegValue |= BIT5; break;
case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT7 + BIT5; break; /* aka FM1 */
case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break; /* aka Manchester */
#if 0
case HDLC_ENCODING_NRZB: /* not supported */
case HDLC_ENCODING_NRZI_MARK: /* not supported */
case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: /* not supported */
#endif
}
if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
DpllDivisor = 16;
RegValue |= BIT3;
} else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
DpllDivisor = 8;
} else {
DpllDivisor = 32;
RegValue |= BIT4;
}
write_reg(info, MD2, RegValue);
/* RXS, Receive clock source
*
* 07 Reserved, must be 0
* 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
* 03..00 RXBR<3..0>, rate divisor, 0000=1
*/
RegValue=0;
if (info->params.flags & HDLC_FLAG_RXC_BRG)
RegValue |= BIT6;
if (info->params.flags & HDLC_FLAG_RXC_DPLL)
RegValue |= BIT6 + BIT5;
write_reg(info, RXS, RegValue);
/* TXS, Transmit clock source
*
* 07 Reserved, must be 0
* 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
* 03..00 RXBR<3..0>, rate divisor, 0000=1
*/
RegValue=0;
if (info->params.flags & HDLC_FLAG_TXC_BRG)
RegValue |= BIT6;
if (info->params.flags & HDLC_FLAG_TXC_DPLL)
RegValue |= BIT6 + BIT5;
write_reg(info, TXS, RegValue);
if (info->params.flags & HDLC_FLAG_RXC_DPLL)
set_rate(info, info->params.clock_speed * DpllDivisor);
else
set_rate(info, info->params.clock_speed);
/* GPDATA (General Purpose I/O Data Register)
*
* 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
*/
if (info->params.flags & HDLC_FLAG_TXC_BRG)
info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
else
info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
write_control_reg(info);
/* RRC Receive Ready Control 0
*
* 07..05 Reserved, must be 0
* 04..00 RRC<4..0> Rx FIFO trigger active
*/
write_reg(info, RRC, rx_active_fifo_level);
/* TRC0 Transmit Ready Control 0
*
* 07..05 Reserved, must be 0
* 04..00 TRC<4..0> Tx FIFO trigger active
*/
write_reg(info, TRC0, tx_active_fifo_level);
/* TRC1 Transmit Ready Control 1
*
* 07..05 Reserved, must be 0
* 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
*/
write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
/* DMR, DMA Mode Register
*
* 07..05 Reserved, must be 0
* 04 TMOD, Transfer Mode: 1=chained-block
* 03 Reserved, must be 0
* 02 NF, Number of Frames: 1=multi-frame
* 01 CNTE, Frame End IRQ Counter enable: 0=disabled
* 00 Reserved, must be 0
*
* 0001 0100
*/
write_reg(info, TXDMA + DMR, 0x14);
write_reg(info, RXDMA + DMR, 0x14);
/* Set chain pointer base (upper 8 bits of 24 bit addr) */
write_reg(info, RXDMA + CPB,
(unsigned char)(info->buffer_list_phys >> 16));
/* Set chain pointer base (upper 8 bits of 24 bit addr) */
write_reg(info, TXDMA + CPB,
(unsigned char)(info->buffer_list_phys >> 16));
/* enable status interrupts. other code enables/disables
* the individual sources for these two interrupt classes.
*/
info->ie0_value |= TXINTE + RXINTE;
write_reg(info, IE0, info->ie0_value);
/* CTL, MSCI control register
*
* 07..06 Reserved, set to 0
* 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
* 04 IDLC, idle control, 0=mark 1=idle register
* 03 BRK, break, 0=off 1 =on (async)
* 02 SYNCLD, sync char load enable (BSC) 1=enabled
* 01 GOP, go active on poll (LOOP mode) 1=enabled
* 00 RTS, RTS output control, 0=active 1=inactive
*
* 0001 0001
*/
RegValue = 0x10;
if (!(info->serial_signals & SerialSignal_RTS))
RegValue |= 0x01;
write_reg(info, CTL, RegValue);
/* preamble not supported ! */
tx_set_idle(info);
tx_stop(info);
rx_stop(info);
set_rate(info, info->params.clock_speed);
if (info->params.loopback)
enable_loopback(info,1);
}
/* Set the transmit HDLC idle mode
*/
static void tx_set_idle(SLMP_INFO *info)
{
unsigned char RegValue = 0xff;
/* Map API idle mode to SCA register bits */
switch(info->idle_mode) {
case HDLC_TXIDLE_FLAGS: RegValue = 0x7e; break;
case HDLC_TXIDLE_ALT_ZEROS_ONES: RegValue = 0xaa; break;
case HDLC_TXIDLE_ZEROS: RegValue = 0x00; break;
case HDLC_TXIDLE_ONES: RegValue = 0xff; break;
case HDLC_TXIDLE_ALT_MARK_SPACE: RegValue = 0xaa; break;
case HDLC_TXIDLE_SPACE: RegValue = 0x00; break;
case HDLC_TXIDLE_MARK: RegValue = 0xff; break;
}
write_reg(info, IDL, RegValue);
}
/* Query the adapter for the state of the V24 status (input) signals.
*/
static void get_signals(SLMP_INFO *info)
{
u16 status = read_reg(info, SR3);
u16 gpstatus = read_status_reg(info);
u16 testbit;
/* clear all serial signals except RTS and DTR */
info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
/* set serial signal bits to reflect MISR */
if (!(status & BIT3))
info->serial_signals |= SerialSignal_CTS;
if ( !(status & BIT2))
info->serial_signals |= SerialSignal_DCD;
testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
if (!(gpstatus & testbit))
info->serial_signals |= SerialSignal_RI;
testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
if (!(gpstatus & testbit))
info->serial_signals |= SerialSignal_DSR;
}
/* Set the state of RTS and DTR based on contents of
* serial_signals member of device context.
*/
static void set_signals(SLMP_INFO *info)
{
unsigned char RegValue;
u16 EnableBit;
RegValue = read_reg(info, CTL);
if (info->serial_signals & SerialSignal_RTS)
RegValue &= ~BIT0;
else
RegValue |= BIT0;
write_reg(info, CTL, RegValue);
// Port 0..3 DTR is ctrl reg <1,3,5,7>
EnableBit = BIT1 << (info->port_num*2);
if (info->serial_signals & SerialSignal_DTR)
info->port_array[0]->ctrlreg_value &= ~EnableBit;
else
info->port_array[0]->ctrlreg_value |= EnableBit;
write_control_reg(info);
}
/*******************/
/* DMA Buffer Code */
/*******************/
/* Set the count for all receive buffers to SCABUFSIZE
* and set the current buffer to the first buffer. This effectively
* makes all buffers free and discards any data in buffers.
*/
static void rx_reset_buffers(SLMP_INFO *info)
{
rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
}
/* Free the buffers used by a received frame
*
* info pointer to device instance data
* first index of 1st receive buffer of frame
* last index of last receive buffer of frame
*/
static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
{
bool done = false;
while(!done) {
/* reset current buffer for reuse */
info->rx_buf_list[first].status = 0xff;
if (first == last) {
done = true;
/* set new last rx descriptor address */
write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
}
first++;
if (first == info->rx_buf_count)
first = 0;
}
/* set current buffer to next buffer after last buffer of frame */
info->current_rx_buf = first;
}
/* Return a received frame from the receive DMA buffers.
* Only frames received without errors are returned.
*
* Return Value: true if frame returned, otherwise false
*/
static bool rx_get_frame(SLMP_INFO *info)
{
unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
unsigned short status;
unsigned int framesize = 0;
bool ReturnCode = false;
unsigned long flags;
struct tty_struct *tty = info->port.tty;
unsigned char addr_field = 0xff;
SCADESC *desc;
SCADESC_EX *desc_ex;
CheckAgain:
/* assume no frame returned, set zero length */
framesize = 0;
addr_field = 0xff;
/*
* current_rx_buf points to the 1st buffer of the next available
* receive frame. To find the last buffer of the frame look for
* a non-zero status field in the buffer entries. (The status
* field is set by the 16C32 after completing a receive frame.
*/
StartIndex = EndIndex = info->current_rx_buf;
for ( ;; ) {
desc = &info->rx_buf_list[EndIndex];
desc_ex = &info->rx_buf_list_ex[EndIndex];
if (desc->status == 0xff)
goto Cleanup; /* current desc still in use, no frames available */
if (framesize == 0 && info->params.addr_filter != 0xff)
addr_field = desc_ex->virt_addr[0];
framesize += desc->length;
/* Status != 0 means last buffer of frame */
if (desc->status)
break;
EndIndex++;
if (EndIndex == info->rx_buf_count)
EndIndex = 0;
if (EndIndex == info->current_rx_buf) {
/* all buffers have been 'used' but none mark */
/* the end of a frame. Reset buffers and receiver. */
if ( info->rx_enabled ){
spin_lock_irqsave(&info->lock,flags);
rx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
goto Cleanup;
}
}
/* check status of receive frame */
/* frame status is byte stored after frame data
*
* 7 EOM (end of msg), 1 = last buffer of frame
* 6 Short Frame, 1 = short frame
* 5 Abort, 1 = frame aborted
* 4 Residue, 1 = last byte is partial
* 3 Overrun, 1 = overrun occurred during frame reception
* 2 CRC, 1 = CRC error detected
*
*/
status = desc->status;
/* ignore CRC bit if not using CRC (bit is undefined) */
/* Note:CRC is not save to data buffer */
if (info->params.crc_type == HDLC_CRC_NONE)
status &= ~BIT2;
if (framesize == 0 ||
(addr_field != 0xff && addr_field != info->params.addr_filter)) {
/* discard 0 byte frames, this seems to occur sometime
* when remote is idling flags.
*/
rx_free_frame_buffers(info, StartIndex, EndIndex);
goto CheckAgain;
}
if (framesize < 2)
status |= BIT6;
if (status & (BIT6+BIT5+BIT3+BIT2)) {
/* received frame has errors,
* update counts and mark frame size as 0
*/
if (status & BIT6)
info->icount.rxshort++;
else if (status & BIT5)
info->icount.rxabort++;
else if (status & BIT3)
info->icount.rxover++;
else
info->icount.rxcrc++;
framesize = 0;
#if SYNCLINK_GENERIC_HDLC
{
info->netdev->stats.rx_errors++;
info->netdev->stats.rx_frame_errors++;
}
#endif
}
if ( debug_level >= DEBUG_LEVEL_BH )
printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
__FILE__,__LINE__,info->device_name,status,framesize);
if ( debug_level >= DEBUG_LEVEL_DATA )
trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
min_t(unsigned int, framesize, SCABUFSIZE), 0);
if (framesize) {
if (framesize > info->max_frame_size)
info->icount.rxlong++;
else {
/* copy dma buffer(s) to contiguous intermediate buffer */
int copy_count = framesize;
int index = StartIndex;
unsigned char *ptmp = info->tmp_rx_buf;
info->tmp_rx_buf_count = framesize;
info->icount.rxok++;
while(copy_count) {
int partial_count = min(copy_count,SCABUFSIZE);
memcpy( ptmp,
info->rx_buf_list_ex[index].virt_addr,
partial_count );
ptmp += partial_count;
copy_count -= partial_count;
if ( ++index == info->rx_buf_count )
index = 0;
}
#if SYNCLINK_GENERIC_HDLC
if (info->netcount)
hdlcdev_rx(info,info->tmp_rx_buf,framesize);
else
#endif
ldisc_receive_buf(tty,info->tmp_rx_buf,
info->flag_buf, framesize);
}
}
/* Free the buffers used by this frame. */
rx_free_frame_buffers( info, StartIndex, EndIndex );
ReturnCode = true;
Cleanup:
if ( info->rx_enabled && info->rx_overflow ) {
/* Receiver is enabled, but needs to restarted due to
* rx buffer overflow. If buffers are empty, restart receiver.
*/
if (info->rx_buf_list[EndIndex].status == 0xff) {
spin_lock_irqsave(&info->lock,flags);
rx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
}
return ReturnCode;
}
/* load the transmit DMA buffer with data
*/
static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
{
unsigned short copy_count;
unsigned int i = 0;
SCADESC *desc;
SCADESC_EX *desc_ex;
if ( debug_level >= DEBUG_LEVEL_DATA )
trace_block(info, buf, min_t(unsigned int, count, SCABUFSIZE), 1);
/* Copy source buffer to one or more DMA buffers, starting with
* the first transmit dma buffer.
*/
for(i=0;;)
{
copy_count = min_t(unsigned int, count, SCABUFSIZE);
desc = &info->tx_buf_list[i];
desc_ex = &info->tx_buf_list_ex[i];
load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
desc->length = copy_count;
desc->status = 0;
buf += copy_count;
count -= copy_count;
if (!count)
break;
i++;
if (i >= info->tx_buf_count)
i = 0;
}
info->tx_buf_list[i].status = 0x81; /* set EOM and EOT status */
info->last_tx_buf = ++i;
}
static bool register_test(SLMP_INFO *info)
{
static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
static unsigned int count = ARRAY_SIZE(testval);
unsigned int i;
bool rc = true;
unsigned long flags;
spin_lock_irqsave(&info->lock,flags);
reset_port(info);
/* assume failure */
info->init_error = DiagStatus_AddressFailure;
/* Write bit patterns to various registers but do it out of */
/* sync, then read back and verify values. */
for (i = 0 ; i < count ; i++) {
write_reg(info, TMC, testval[i]);
write_reg(info, IDL, testval[(i+1)%count]);
write_reg(info, SA0, testval[(i+2)%count]);
write_reg(info, SA1, testval[(i+3)%count]);
if ( (read_reg(info, TMC) != testval[i]) ||
(read_reg(info, IDL) != testval[(i+1)%count]) ||
(read_reg(info, SA0) != testval[(i+2)%count]) ||
(read_reg(info, SA1) != testval[(i+3)%count]) )
{
rc = false;
break;
}
}
reset_port(info);
spin_unlock_irqrestore(&info->lock,flags);
return rc;
}
static bool irq_test(SLMP_INFO *info)
{
unsigned long timeout;
unsigned long flags;
unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
spin_lock_irqsave(&info->lock,flags);
reset_port(info);
/* assume failure */
info->init_error = DiagStatus_IrqFailure;
info->irq_occurred = false;
/* setup timer0 on SCA0 to interrupt */
/* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
write_reg(info, (unsigned char)(timer + TEPR), 0); /* timer expand prescale */
write_reg16(info, (unsigned char)(timer + TCONR), 1); /* timer constant */
/* TMCS, Timer Control/Status Register
*
* 07 CMF, Compare match flag (read only) 1=match
* 06 ECMI, CMF Interrupt Enable: 1=enabled
* 05 Reserved, must be 0
* 04 TME, Timer Enable
* 03..00 Reserved, must be 0
*
* 0101 0000
*/
write_reg(info, (unsigned char)(timer + TMCS), 0x50);
spin_unlock_irqrestore(&info->lock,flags);
timeout=100;
while( timeout-- && !info->irq_occurred ) {
msleep_interruptible(10);
}
spin_lock_irqsave(&info->lock,flags);
reset_port(info);
spin_unlock_irqrestore(&info->lock,flags);
return info->irq_occurred;
}
/* initialize individual SCA device (2 ports)
*/
static bool sca_init(SLMP_INFO *info)
{
/* set wait controller to single mem partition (low), no wait states */
write_reg(info, PABR0, 0); /* wait controller addr boundary 0 */
write_reg(info, PABR1, 0); /* wait controller addr boundary 1 */
write_reg(info, WCRL, 0); /* wait controller low range */
write_reg(info, WCRM, 0); /* wait controller mid range */
write_reg(info, WCRH, 0); /* wait controller high range */
/* DPCR, DMA Priority Control
*
* 07..05 Not used, must be 0
* 04 BRC, bus release condition: 0=all transfers complete
* 03 CCC, channel change condition: 0=every cycle
* 02..00 PR<2..0>, priority 100=round robin
*
* 00000100 = 0x04
*/
write_reg(info, DPCR, dma_priority);
/* DMA Master Enable, BIT7: 1=enable all channels */
write_reg(info, DMER, 0x80);
/* enable all interrupt classes */
write_reg(info, IER0, 0xff); /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
write_reg(info, IER1, 0xff); /* DMIB,DMIA (channels 0-3) */
write_reg(info, IER2, 0xf0); /* TIRQ (timers 0-3) */
/* ITCR, interrupt control register
* 07 IPC, interrupt priority, 0=MSCI->DMA
* 06..05 IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
* 04 VOS, Vector Output, 0=unmodified vector
* 03..00 Reserved, must be 0
*/
write_reg(info, ITCR, 0);
return true;
}
/* initialize adapter hardware
*/
static bool init_adapter(SLMP_INFO *info)
{
int i;
/* Set BIT30 of Local Control Reg 0x50 to reset SCA */
volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
u32 readval;
info->misc_ctrl_value |= BIT30;
*MiscCtrl = info->misc_ctrl_value;
/*
* Force at least 170ns delay before clearing
* reset bit. Each read from LCR takes at least
* 30ns so 10 times for 300ns to be safe.
*/
for(i=0;i<10;i++)
readval = *MiscCtrl;
info->misc_ctrl_value &= ~BIT30;
*MiscCtrl = info->misc_ctrl_value;
/* init control reg (all DTRs off, all clksel=input) */
info->ctrlreg_value = 0xaa;
write_control_reg(info);
{
volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
switch(read_ahead_count)
{
case 16:
lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
break;
case 8:
lcr1_brdr_value |= BIT5 + BIT4;
break;
case 4:
lcr1_brdr_value |= BIT5 + BIT3;
break;
case 0:
lcr1_brdr_value |= BIT5;
break;
}
*LCR1BRDR = lcr1_brdr_value;
*MiscCtrl = misc_ctrl_value;
}
sca_init(info->port_array[0]);
sca_init(info->port_array[2]);
return true;
}
/* Loopback an HDLC frame to test the hardware
* interrupt and DMA functions.
*/
static bool loopback_test(SLMP_INFO *info)
{
#define TESTFRAMESIZE 20
unsigned long timeout;
u16 count = TESTFRAMESIZE;
unsigned char buf[TESTFRAMESIZE];
bool rc = false;
unsigned long flags;
struct tty_struct *oldtty = info->port.tty;
u32 speed = info->params.clock_speed;
info->params.clock_speed = 3686400;
info->port.tty = NULL;
/* assume failure */
info->init_error = DiagStatus_DmaFailure;
/* build and send transmit frame */
for (count = 0; count < TESTFRAMESIZE;++count)
buf[count] = (unsigned char)count;
memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
/* program hardware for HDLC and enabled receiver */
spin_lock_irqsave(&info->lock,flags);
hdlc_mode(info);
enable_loopback(info,1);
rx_start(info);
info->tx_count = count;
tx_load_dma_buffer(info,buf,count);
tx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
/* wait for receive complete */
/* Set a timeout for waiting for interrupt. */
for ( timeout = 100; timeout; --timeout ) {
msleep_interruptible(10);
if (rx_get_frame(info)) {
rc = true;
break;
}
}
/* verify received frame length and contents */
if (rc &&
( info->tmp_rx_buf_count != count ||
memcmp(buf, info->tmp_rx_buf,count))) {
rc = false;
}
spin_lock_irqsave(&info->lock,flags);
reset_adapter(info);
spin_unlock_irqrestore(&info->lock,flags);
info->params.clock_speed = speed;
info->port.tty = oldtty;
return rc;
}
/* Perform diagnostics on hardware
*/
static int adapter_test( SLMP_INFO *info )
{
unsigned long flags;
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):Testing device %s\n",
__FILE__,__LINE__,info->device_name );
spin_lock_irqsave(&info->lock,flags);
init_adapter(info);
spin_unlock_irqrestore(&info->lock,flags);
info->port_array[0]->port_count = 0;
if ( register_test(info->port_array[0]) &&
register_test(info->port_array[1])) {
info->port_array[0]->port_count = 2;
if ( register_test(info->port_array[2]) &&
register_test(info->port_array[3]) )
info->port_array[0]->port_count += 2;
}
else {
printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
__FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
return -ENODEV;
}
if ( !irq_test(info->port_array[0]) ||
!irq_test(info->port_array[1]) ||
(info->port_count == 4 && !irq_test(info->port_array[2])) ||
(info->port_count == 4 && !irq_test(info->port_array[3]))) {
printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
__FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
return -ENODEV;
}
if (!loopback_test(info->port_array[0]) ||
!loopback_test(info->port_array[1]) ||
(info->port_count == 4 && !loopback_test(info->port_array[2])) ||
(info->port_count == 4 && !loopback_test(info->port_array[3]))) {
printk( "%s(%d):DMA test failure for device %s\n",
__FILE__,__LINE__,info->device_name);
return -ENODEV;
}
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):device %s passed diagnostics\n",
__FILE__,__LINE__,info->device_name );
info->port_array[0]->init_error = 0;
info->port_array[1]->init_error = 0;
if ( info->port_count > 2 ) {
info->port_array[2]->init_error = 0;
info->port_array[3]->init_error = 0;
}
return 0;
}
/* Test the shared memory on a PCI adapter.
*/
static bool memory_test(SLMP_INFO *info)
{
static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
unsigned long count = ARRAY_SIZE(testval);
unsigned long i;
unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
unsigned long * addr = (unsigned long *)info->memory_base;
/* Test data lines with test pattern at one location. */
for ( i = 0 ; i < count ; i++ ) {
*addr = testval[i];
if ( *addr != testval[i] )
return false;
}
/* Test address lines with incrementing pattern over */
/* entire address range. */
for ( i = 0 ; i < limit ; i++ ) {
*addr = i * 4;
addr++;
}
addr = (unsigned long *)info->memory_base;
for ( i = 0 ; i < limit ; i++ ) {
if ( *addr != i * 4 )
return false;
addr++;
}
memset( info->memory_base, 0, SCA_MEM_SIZE );
return true;
}
/* Load data into PCI adapter shared memory.
*
* The PCI9050 releases control of the local bus
* after completing the current read or write operation.
*
* While the PCI9050 write FIFO not empty, the
* PCI9050 treats all of the writes as a single transaction
* and does not release the bus. This causes DMA latency problems
* at high speeds when copying large data blocks to the shared memory.
*
* This function breaks a write into multiple transations by
* interleaving a read which flushes the write FIFO and 'completes'
* the write transation. This allows any pending DMA request to gain control
* of the local bus in a timely fasion.
*/
static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
{
/* A load interval of 16 allows for 4 32-bit writes at */
/* 136ns each for a maximum latency of 542ns on the local bus.*/
unsigned short interval = count / sca_pci_load_interval;
unsigned short i;
for ( i = 0 ; i < interval ; i++ )
{
memcpy(dest, src, sca_pci_load_interval);
read_status_reg(info);
dest += sca_pci_load_interval;
src += sca_pci_load_interval;
}
memcpy(dest, src, count % sca_pci_load_interval);
}
static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
{
int i;
int linecount;
if (xmit)
printk("%s tx data:\n",info->device_name);
else
printk("%s rx data:\n",info->device_name);
while(count) {
if (count > 16)
linecount = 16;
else
linecount = count;
for(i=0;i<linecount;i++)
printk("%02X ",(unsigned char)data[i]);
for(;i<17;i++)
printk(" ");
for(i=0;i<linecount;i++) {
if (data[i]>=040 && data[i]<=0176)
printk("%c",data[i]);
else
printk(".");
}
printk("\n");
data += linecount;
count -= linecount;
}
} /* end of trace_block() */
/* called when HDLC frame times out
* update stats and do tx completion processing
*/
static void tx_timeout(unsigned long context)
{
SLMP_INFO *info = (SLMP_INFO*)context;
unsigned long flags;
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):%s tx_timeout()\n",
__FILE__,__LINE__,info->device_name);
if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
info->icount.txtimeout++;
}
spin_lock_irqsave(&info->lock,flags);
info->tx_active = false;
info->tx_count = info->tx_put = info->tx_get = 0;
spin_unlock_irqrestore(&info->lock,flags);
#if SYNCLINK_GENERIC_HDLC
if (info->netcount)
hdlcdev_tx_done(info);
else
#endif
bh_transmit(info);
}
/* called to periodically check the DSR/RI modem signal input status
*/
static void status_timeout(unsigned long context)
{
u16 status = 0;
SLMP_INFO *info = (SLMP_INFO*)context;
unsigned long flags;
unsigned char delta;
spin_lock_irqsave(&info->lock,flags);
get_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
/* check for DSR/RI state change */
delta = info->old_signals ^ info->serial_signals;
info->old_signals = info->serial_signals;
if (delta & SerialSignal_DSR)
status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
if (delta & SerialSignal_RI)
status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
if (delta & SerialSignal_DCD)
status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
if (delta & SerialSignal_CTS)
status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
if (status)
isr_io_pin(info,status);
mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
}
/* Register Access Routines -
* All registers are memory mapped
*/
#define CALC_REGADDR() \
unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
if (info->port_num > 1) \
RegAddr += 256; /* port 0-1 SCA0, 2-3 SCA1 */ \
if ( info->port_num & 1) { \
if (Addr > 0x7f) \
RegAddr += 0x40; /* DMA access */ \
else if (Addr > 0x1f && Addr < 0x60) \
RegAddr += 0x20; /* MSCI access */ \
}
static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
{
CALC_REGADDR();
return *RegAddr;
}
static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
{
CALC_REGADDR();
*RegAddr = Value;
}
static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
{
CALC_REGADDR();
return *((u16 *)RegAddr);
}
static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
{
CALC_REGADDR();
*((u16 *)RegAddr) = Value;
}
static unsigned char read_status_reg(SLMP_INFO * info)
{
unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
return *RegAddr;
}
static void write_control_reg(SLMP_INFO * info)
{
unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
*RegAddr = info->port_array[0]->ctrlreg_value;
}
static int synclinkmp_init_one (struct pci_dev *dev,
const struct pci_device_id *ent)
{
if (pci_enable_device(dev)) {
printk("error enabling pci device %p\n", dev);
return -EIO;
}
device_init( ++synclinkmp_adapter_count, dev );
return 0;
}
static void synclinkmp_remove_one (struct pci_dev *dev)
{
}
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