mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 13:43:55 +08:00
5d1ea1ad28
This check is used in the code on many places. Either in positive or negative form. So introduce a helper called mxser_16550A_or_MUST for this purpose. And replace all the occurrences. This simplifies many ifs in there. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20210618061516.662-67-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024 lines
52 KiB
C
2024 lines
52 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* mxser.c -- MOXA Smartio/Industio family multiport serial driver.
|
|
*
|
|
* Copyright (C) 1999-2006 Moxa Technologies (support@moxa.com).
|
|
* Copyright (C) 2006-2008 Jiri Slaby <jirislaby@gmail.com>
|
|
*
|
|
* This code is loosely based on the 1.8 moxa driver which is based on
|
|
* Linux serial driver, written by Linus Torvalds, Theodore T'so and
|
|
* others.
|
|
*
|
|
* Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
|
|
* <alan@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
|
|
* www.moxa.com.
|
|
* - Fixed x86_64 cleanness
|
|
*/
|
|
|
|
#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/tty.h>
|
|
#include <linux/tty_flip.h>
|
|
#include <linux/serial.h>
|
|
#include <linux/serial_reg.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/delay.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/ratelimit.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/irq.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
/*
|
|
* Semi-public control interfaces
|
|
*/
|
|
|
|
/*
|
|
* MOXA ioctls
|
|
*/
|
|
|
|
#define MOXA 0x400
|
|
#define MOXA_SET_OP_MODE (MOXA + 66)
|
|
#define MOXA_GET_OP_MODE (MOXA + 67)
|
|
|
|
#define RS232_MODE 0
|
|
#define RS485_2WIRE_MODE 1
|
|
#define RS422_MODE 2
|
|
#define RS485_4WIRE_MODE 3
|
|
#define OP_MODE_MASK 3
|
|
|
|
/* --------------------------------------------------- */
|
|
|
|
/*
|
|
* Follow just what Moxa Must chip defines.
|
|
*
|
|
* When LCR register (offset 0x03) is written the following value, the Must chip
|
|
* will enter enhanced mode. And a write to EFR (offset 0x02) bit 6,7 will
|
|
* change bank.
|
|
*/
|
|
#define MOXA_MUST_ENTER_ENHANCED 0xBF
|
|
|
|
/* when enhanced mode is enabled, access to general bank register */
|
|
#define MOXA_MUST_GDL_REGISTER 0x07
|
|
#define MOXA_MUST_GDL_MASK 0x7F
|
|
#define MOXA_MUST_GDL_HAS_BAD_DATA 0x80
|
|
|
|
#define MOXA_MUST_LSR_RERR 0x80 /* error in receive FIFO */
|
|
/* enhanced register bank select and enhanced mode setting register */
|
|
/* This works only when LCR register equals to 0xBF */
|
|
#define MOXA_MUST_EFR_REGISTER 0x02
|
|
#define MOXA_MUST_EFR_EFRB_ENABLE 0x10 /* enhanced mode enable */
|
|
/* enhanced register bank set 0, 1, 2 */
|
|
#define MOXA_MUST_EFR_BANK0 0x00
|
|
#define MOXA_MUST_EFR_BANK1 0x40
|
|
#define MOXA_MUST_EFR_BANK2 0x80
|
|
#define MOXA_MUST_EFR_BANK3 0xC0
|
|
#define MOXA_MUST_EFR_BANK_MASK 0xC0
|
|
|
|
/* set XON1 value register, when LCR=0xBF and change to bank0 */
|
|
#define MOXA_MUST_XON1_REGISTER 0x04
|
|
|
|
/* set XON2 value register, when LCR=0xBF and change to bank0 */
|
|
#define MOXA_MUST_XON2_REGISTER 0x05
|
|
|
|
/* set XOFF1 value register, when LCR=0xBF and change to bank0 */
|
|
#define MOXA_MUST_XOFF1_REGISTER 0x06
|
|
|
|
/* set XOFF2 value register, when LCR=0xBF and change to bank0 */
|
|
#define MOXA_MUST_XOFF2_REGISTER 0x07
|
|
|
|
#define MOXA_MUST_RBRTL_REGISTER 0x04
|
|
#define MOXA_MUST_RBRTH_REGISTER 0x05
|
|
#define MOXA_MUST_RBRTI_REGISTER 0x06
|
|
#define MOXA_MUST_THRTL_REGISTER 0x07
|
|
#define MOXA_MUST_ENUM_REGISTER 0x04
|
|
#define MOXA_MUST_HWID_REGISTER 0x05
|
|
#define MOXA_MUST_ECR_REGISTER 0x06
|
|
#define MOXA_MUST_CSR_REGISTER 0x07
|
|
|
|
#define MOXA_MUST_FCR_GDA_MODE_ENABLE 0x20 /* good data mode enable */
|
|
#define MOXA_MUST_FCR_GDA_ONLY_ENABLE 0x10 /* only good data put into RxFIFO */
|
|
|
|
#define MOXA_MUST_IER_ECTSI 0x80 /* enable CTS interrupt */
|
|
#define MOXA_MUST_IER_ERTSI 0x40 /* enable RTS interrupt */
|
|
#define MOXA_MUST_IER_XINT 0x20 /* enable Xon/Xoff interrupt */
|
|
#define MOXA_MUST_IER_EGDAI 0x10 /* enable GDA interrupt */
|
|
|
|
#define MOXA_MUST_RECV_ISR (UART_IER_RDI | MOXA_MUST_IER_EGDAI)
|
|
|
|
/* GDA interrupt pending */
|
|
#define MOXA_MUST_IIR_GDA 0x1C
|
|
#define MOXA_MUST_IIR_RDA 0x04
|
|
#define MOXA_MUST_IIR_RTO 0x0C
|
|
#define MOXA_MUST_IIR_LSR 0x06
|
|
|
|
/* received Xon/Xoff or specical interrupt pending */
|
|
#define MOXA_MUST_IIR_XSC 0x10
|
|
|
|
/* RTS/CTS change state interrupt pending */
|
|
#define MOXA_MUST_IIR_RTSCTS 0x20
|
|
#define MOXA_MUST_IIR_MASK 0x3E
|
|
|
|
#define MOXA_MUST_MCR_XON_FLAG 0x40
|
|
#define MOXA_MUST_MCR_XON_ANY 0x80
|
|
#define MOXA_MUST_MCR_TX_XON 0x08
|
|
|
|
#define MOXA_MUST_EFR_SF_MASK 0x0F /* software flow control on chip mask value */
|
|
#define MOXA_MUST_EFR_SF_TX1 0x08 /* send Xon1/Xoff1 */
|
|
#define MOXA_MUST_EFR_SF_TX2 0x04 /* send Xon2/Xoff2 */
|
|
#define MOXA_MUST_EFR_SF_TX12 0x0C /* send Xon1,Xon2/Xoff1,Xoff2 */
|
|
#define MOXA_MUST_EFR_SF_TX_NO 0x00 /* don't send Xon/Xoff */
|
|
#define MOXA_MUST_EFR_SF_TX_MASK 0x0C /* Tx software flow control mask */
|
|
#define MOXA_MUST_EFR_SF_RX_NO 0x00 /* don't receive Xon/Xoff */
|
|
#define MOXA_MUST_EFR_SF_RX1 0x02 /* receive Xon1/Xoff1 */
|
|
#define MOXA_MUST_EFR_SF_RX2 0x01 /* receive Xon2/Xoff2 */
|
|
#define MOXA_MUST_EFR_SF_RX12 0x03 /* receive Xon1,Xon2/Xoff1,Xoff2 */
|
|
#define MOXA_MUST_EFR_SF_RX_MASK 0x03 /* Rx software flow control mask */
|
|
|
|
#define MXSERMAJOR 174
|
|
|
|
#define MXSER_BOARDS 4 /* Max. boards */
|
|
#define MXSER_PORTS_PER_BOARD 8 /* Max. ports per board */
|
|
#define MXSER_PORTS (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
|
|
#define MXSER_ISR_PASS_LIMIT 100
|
|
|
|
#define WAKEUP_CHARS 256
|
|
|
|
#define MXSER_BAUD_BASE 921600
|
|
#define MXSER_CUSTOM_DIVISOR (MXSER_BAUD_BASE * 16)
|
|
|
|
#define PCI_DEVICE_ID_POS104UL 0x1044
|
|
#define PCI_DEVICE_ID_CB108 0x1080
|
|
#define PCI_DEVICE_ID_CP102UF 0x1023
|
|
#define PCI_DEVICE_ID_CP112UL 0x1120
|
|
#define PCI_DEVICE_ID_CB114 0x1142
|
|
#define PCI_DEVICE_ID_CP114UL 0x1143
|
|
#define PCI_DEVICE_ID_CB134I 0x1341
|
|
#define PCI_DEVICE_ID_CP138U 0x1380
|
|
|
|
#define MXSER_NPORTS(ddata) ((ddata) & 0xffU)
|
|
#define MXSER_HIGHBAUD 0x0100
|
|
|
|
enum mxser_must_hwid {
|
|
MOXA_OTHER_UART = 0x00,
|
|
MOXA_MUST_MU150_HWID = 0x01,
|
|
MOXA_MUST_MU860_HWID = 0x02,
|
|
};
|
|
|
|
static const struct {
|
|
u8 type;
|
|
u8 fifo_size;
|
|
u8 rx_high_water;
|
|
u8 rx_low_water;
|
|
speed_t max_baud;
|
|
} Gpci_uart_info[] = {
|
|
{ MOXA_OTHER_UART, 16, 14, 1, 921600 },
|
|
{ MOXA_MUST_MU150_HWID, 64, 48, 16, 230400 },
|
|
{ MOXA_MUST_MU860_HWID, 128, 96, 32, 921600 }
|
|
};
|
|
#define UART_INFO_NUM ARRAY_SIZE(Gpci_uart_info)
|
|
|
|
|
|
/* driver_data correspond to the lines in the structure above
|
|
see also ISA probe function before you change something */
|
|
static const struct pci_device_id mxser_pcibrds[] = {
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168), .driver_data = 8 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104), .driver_data = 4 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132), .driver_data = 2 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114), .driver_data = 4 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114), .driver_data = 4 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102), .driver_data = 2 | MXSER_HIGHBAUD },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 4 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 8 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 2 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 4 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 4 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 8 }, /* RC7000 */
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 8 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 2 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 2 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 8 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 8 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 4 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108), .driver_data = 8 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114), .driver_data = 4 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I), .driver_data = 4 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U), .driver_data = 8 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL), .driver_data = 4 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL), .driver_data = 4 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF), .driver_data = 2 },
|
|
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL), .driver_data = 2 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
|
|
|
|
static int ttymajor = MXSERMAJOR;
|
|
|
|
/* Variables for insmod */
|
|
|
|
MODULE_AUTHOR("Casper Yang");
|
|
MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
|
|
module_param(ttymajor, int, 0);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
struct mxser_board;
|
|
|
|
struct mxser_port {
|
|
struct tty_port port;
|
|
struct mxser_board *board;
|
|
|
|
unsigned long ioaddr;
|
|
unsigned long opmode_ioaddr;
|
|
|
|
u8 rx_high_water;
|
|
u8 rx_low_water;
|
|
int type; /* UART type */
|
|
|
|
unsigned char x_char; /* xon/xoff character */
|
|
u8 IER; /* Interrupt Enable Register */
|
|
u8 MCR; /* Modem control register */
|
|
|
|
unsigned char ldisc_stop_rx;
|
|
|
|
struct async_icount icount; /* kernel counters for 4 input interrupts */
|
|
unsigned int timeout;
|
|
|
|
u8 read_status_mask;
|
|
u8 ignore_status_mask;
|
|
u8 xmit_fifo_size;
|
|
unsigned int xmit_head;
|
|
unsigned int xmit_tail;
|
|
unsigned int xmit_cnt;
|
|
int closing;
|
|
|
|
spinlock_t slock;
|
|
};
|
|
|
|
struct mxser_board {
|
|
unsigned int idx;
|
|
unsigned short nports;
|
|
int irq;
|
|
unsigned long vector;
|
|
|
|
enum mxser_must_hwid must_hwid;
|
|
speed_t max_baud;
|
|
|
|
struct mxser_port ports[];
|
|
};
|
|
|
|
static DECLARE_BITMAP(mxser_boards, MXSER_BOARDS);
|
|
static struct tty_driver *mxvar_sdriver;
|
|
|
|
static u8 __mxser_must_set_EFR(unsigned long baseio, u8 clear, u8 set,
|
|
bool restore_LCR)
|
|
{
|
|
u8 oldlcr, efr;
|
|
|
|
oldlcr = inb(baseio + UART_LCR);
|
|
outb(MOXA_MUST_ENTER_ENHANCED, baseio + UART_LCR);
|
|
|
|
efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
|
|
efr &= ~clear;
|
|
efr |= set;
|
|
|
|
outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
|
|
|
|
if (restore_LCR)
|
|
outb(oldlcr, baseio + UART_LCR);
|
|
|
|
return oldlcr;
|
|
}
|
|
|
|
static u8 mxser_must_select_bank(unsigned long baseio, u8 bank)
|
|
{
|
|
return __mxser_must_set_EFR(baseio, MOXA_MUST_EFR_BANK_MASK, bank,
|
|
false);
|
|
}
|
|
|
|
static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
|
|
{
|
|
u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK0);
|
|
outb(value, baseio + MOXA_MUST_XON1_REGISTER);
|
|
outb(oldlcr, baseio + UART_LCR);
|
|
}
|
|
|
|
static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
|
|
{
|
|
u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK0);
|
|
outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
|
|
outb(oldlcr, baseio + UART_LCR);
|
|
}
|
|
|
|
static void mxser_set_must_fifo_value(struct mxser_port *info)
|
|
{
|
|
u8 oldlcr = mxser_must_select_bank(info->ioaddr, MOXA_MUST_EFR_BANK1);
|
|
outb(info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
|
|
outb(info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
|
|
outb(info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
|
|
outb(oldlcr, info->ioaddr + UART_LCR);
|
|
}
|
|
|
|
static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
|
|
{
|
|
u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK2);
|
|
outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
|
|
outb(oldlcr, baseio + UART_LCR);
|
|
}
|
|
|
|
static u8 mxser_get_must_hardware_id(unsigned long baseio)
|
|
{
|
|
u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK2);
|
|
u8 id = inb(baseio + MOXA_MUST_HWID_REGISTER);
|
|
outb(oldlcr, baseio + UART_LCR);
|
|
|
|
return id;
|
|
}
|
|
|
|
static void mxser_must_set_EFR(unsigned long baseio, u8 clear, u8 set)
|
|
{
|
|
__mxser_must_set_EFR(baseio, clear, set, true);
|
|
}
|
|
|
|
static void mxser_must_set_enhance_mode(unsigned long baseio, bool enable)
|
|
{
|
|
mxser_must_set_EFR(baseio,
|
|
enable ? 0 : MOXA_MUST_EFR_EFRB_ENABLE,
|
|
enable ? MOXA_MUST_EFR_EFRB_ENABLE : 0);
|
|
}
|
|
|
|
static void mxser_must_no_sw_flow_control(unsigned long baseio)
|
|
{
|
|
mxser_must_set_EFR(baseio, MOXA_MUST_EFR_SF_MASK, 0);
|
|
}
|
|
|
|
static void mxser_must_set_tx_sw_flow_control(unsigned long baseio, bool enable)
|
|
{
|
|
mxser_must_set_EFR(baseio, MOXA_MUST_EFR_SF_TX_MASK,
|
|
enable ? MOXA_MUST_EFR_SF_TX1 : 0);
|
|
}
|
|
|
|
static void mxser_must_set_rx_sw_flow_control(unsigned long baseio, bool enable)
|
|
{
|
|
mxser_must_set_EFR(baseio, MOXA_MUST_EFR_SF_RX_MASK,
|
|
enable ? MOXA_MUST_EFR_SF_RX1 : 0);
|
|
}
|
|
|
|
static enum mxser_must_hwid mxser_must_get_hwid(unsigned long io)
|
|
{
|
|
u8 oldmcr, hwid;
|
|
int i;
|
|
|
|
outb(0, io + UART_LCR);
|
|
mxser_must_set_enhance_mode(io, false);
|
|
oldmcr = inb(io + UART_MCR);
|
|
outb(0, io + UART_MCR);
|
|
mxser_set_must_xon1_value(io, 0x11);
|
|
if ((hwid = inb(io + UART_MCR)) != 0) {
|
|
outb(oldmcr, io + UART_MCR);
|
|
return MOXA_OTHER_UART;
|
|
}
|
|
|
|
hwid = mxser_get_must_hardware_id(io);
|
|
for (i = 1; i < UART_INFO_NUM; i++) /* 0 = OTHER_UART */
|
|
if (hwid == Gpci_uart_info[i].type)
|
|
return hwid;
|
|
|
|
return MOXA_OTHER_UART;
|
|
}
|
|
|
|
static bool mxser_16550A_or_MUST(struct mxser_port *info)
|
|
{
|
|
return info->type == PORT_16550A || info->board->must_hwid;
|
|
}
|
|
|
|
static void mxser_process_txrx_fifo(struct mxser_port *info)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (info->type == PORT_16450 || info->type == PORT_8250) {
|
|
info->rx_high_water = 1;
|
|
info->rx_low_water = 1;
|
|
info->xmit_fifo_size = 1;
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < UART_INFO_NUM; i++)
|
|
if (info->board->must_hwid == Gpci_uart_info[i].type) {
|
|
info->rx_low_water = Gpci_uart_info[i].rx_low_water;
|
|
info->rx_high_water = Gpci_uart_info[i].rx_high_water;
|
|
info->xmit_fifo_size = Gpci_uart_info[i].fifo_size;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void __mxser_start_tx(struct mxser_port *info)
|
|
{
|
|
outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
|
|
info->IER |= UART_IER_THRI;
|
|
outb(info->IER, info->ioaddr + UART_IER);
|
|
}
|
|
|
|
static void mxser_start_tx(struct mxser_port *info)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
__mxser_start_tx(info);
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
}
|
|
|
|
static void __mxser_stop_tx(struct mxser_port *info)
|
|
{
|
|
info->IER &= ~UART_IER_THRI;
|
|
outb(info->IER, info->ioaddr + UART_IER);
|
|
}
|
|
|
|
static int mxser_carrier_raised(struct tty_port *port)
|
|
{
|
|
struct mxser_port *mp = container_of(port, struct mxser_port, port);
|
|
return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
|
|
}
|
|
|
|
static void mxser_dtr_rts(struct tty_port *port, int on)
|
|
{
|
|
struct mxser_port *mp = container_of(port, struct mxser_port, port);
|
|
unsigned long flags;
|
|
u8 mcr;
|
|
|
|
spin_lock_irqsave(&mp->slock, flags);
|
|
mcr = inb(mp->ioaddr + UART_MCR);
|
|
if (on)
|
|
mcr |= UART_MCR_DTR | UART_MCR_RTS;
|
|
else
|
|
mcr &= ~(UART_MCR_DTR | UART_MCR_RTS);
|
|
outb(mcr, mp->ioaddr + UART_MCR);
|
|
spin_unlock_irqrestore(&mp->slock, flags);
|
|
}
|
|
|
|
static int mxser_set_baud(struct tty_struct *tty, speed_t newspd)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
unsigned int quot = 0, baud;
|
|
unsigned char cval;
|
|
u64 timeout;
|
|
|
|
if (newspd > info->board->max_baud)
|
|
return -1;
|
|
|
|
if (newspd == 134) {
|
|
quot = 2 * MXSER_BAUD_BASE / 269;
|
|
tty_encode_baud_rate(tty, 134, 134);
|
|
} else if (newspd) {
|
|
quot = MXSER_BAUD_BASE / newspd;
|
|
if (quot == 0)
|
|
quot = 1;
|
|
baud = MXSER_BAUD_BASE / quot;
|
|
tty_encode_baud_rate(tty, baud, baud);
|
|
} else {
|
|
quot = 0;
|
|
}
|
|
|
|
/*
|
|
* worst case (128 * 1000 * 10 * 18432) needs 35 bits, so divide in the
|
|
* u64 domain
|
|
*/
|
|
timeout = (u64)info->xmit_fifo_size * HZ * 10 * quot;
|
|
do_div(timeout, MXSER_BAUD_BASE);
|
|
info->timeout = timeout + HZ / 50; /* Add .02 seconds of slop */
|
|
|
|
if (quot) {
|
|
info->MCR |= UART_MCR_DTR;
|
|
outb(info->MCR, info->ioaddr + UART_MCR);
|
|
} else {
|
|
info->MCR &= ~UART_MCR_DTR;
|
|
outb(info->MCR, info->ioaddr + UART_MCR);
|
|
return 0;
|
|
}
|
|
|
|
cval = inb(info->ioaddr + UART_LCR);
|
|
|
|
outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR); /* set DLAB */
|
|
|
|
outb(quot & 0xff, info->ioaddr + UART_DLL); /* LS of divisor */
|
|
outb(quot >> 8, info->ioaddr + UART_DLM); /* MS of divisor */
|
|
outb(cval, info->ioaddr + UART_LCR); /* reset DLAB */
|
|
|
|
#ifdef BOTHER
|
|
if (C_BAUD(tty) == BOTHER) {
|
|
quot = MXSER_BAUD_BASE % newspd;
|
|
quot *= 8;
|
|
if (quot % newspd > newspd / 2) {
|
|
quot /= newspd;
|
|
quot++;
|
|
} else
|
|
quot /= newspd;
|
|
|
|
mxser_set_must_enum_value(info->ioaddr, quot);
|
|
} else
|
|
#endif
|
|
mxser_set_must_enum_value(info->ioaddr, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mxser_handle_cts(struct tty_struct *tty, struct mxser_port *info,
|
|
u8 msr)
|
|
{
|
|
bool cts = msr & UART_MSR_CTS;
|
|
|
|
if (tty->hw_stopped) {
|
|
if (cts) {
|
|
tty->hw_stopped = 0;
|
|
|
|
if (!mxser_16550A_or_MUST(info))
|
|
__mxser_start_tx(info);
|
|
tty_wakeup(tty);
|
|
}
|
|
return;
|
|
} else if (cts)
|
|
return;
|
|
|
|
tty->hw_stopped = 1;
|
|
if (!mxser_16550A_or_MUST(info))
|
|
__mxser_stop_tx(info);
|
|
}
|
|
|
|
/*
|
|
* This routine is called to set the UART divisor registers to match
|
|
* the specified baud rate for a serial port.
|
|
*/
|
|
static void mxser_change_speed(struct tty_struct *tty)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
unsigned cflag, cval, fcr;
|
|
|
|
cflag = tty->termios.c_cflag;
|
|
|
|
mxser_set_baud(tty, tty_get_baud_rate(tty));
|
|
|
|
/* byte size and parity */
|
|
switch (cflag & CSIZE) {
|
|
default:
|
|
case CS5:
|
|
cval = UART_LCR_WLEN5;
|
|
break;
|
|
case CS6:
|
|
cval = UART_LCR_WLEN6;
|
|
break;
|
|
case CS7:
|
|
cval = UART_LCR_WLEN7;
|
|
break;
|
|
case CS8:
|
|
cval = UART_LCR_WLEN8;
|
|
break;
|
|
}
|
|
|
|
if (cflag & CSTOPB)
|
|
cval |= UART_LCR_STOP;
|
|
if (cflag & PARENB)
|
|
cval |= UART_LCR_PARITY;
|
|
if (!(cflag & PARODD))
|
|
cval |= UART_LCR_EPAR;
|
|
if (cflag & CMSPAR)
|
|
cval |= UART_LCR_SPAR;
|
|
|
|
if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
|
|
if (info->board->must_hwid) {
|
|
fcr = UART_FCR_ENABLE_FIFO;
|
|
fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
|
|
mxser_set_must_fifo_value(info);
|
|
} else
|
|
fcr = 0;
|
|
} else {
|
|
fcr = UART_FCR_ENABLE_FIFO;
|
|
if (info->board->must_hwid) {
|
|
fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
|
|
mxser_set_must_fifo_value(info);
|
|
} else {
|
|
switch (info->rx_high_water) {
|
|
case 1:
|
|
fcr |= UART_FCR_TRIGGER_1;
|
|
break;
|
|
case 4:
|
|
fcr |= UART_FCR_TRIGGER_4;
|
|
break;
|
|
case 8:
|
|
fcr |= UART_FCR_TRIGGER_8;
|
|
break;
|
|
default:
|
|
fcr |= UART_FCR_TRIGGER_14;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* CTS flow control flag and modem status interrupts */
|
|
info->IER &= ~UART_IER_MSI;
|
|
info->MCR &= ~UART_MCR_AFE;
|
|
tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
|
|
if (cflag & CRTSCTS) {
|
|
info->IER |= UART_IER_MSI;
|
|
if (mxser_16550A_or_MUST(info)) {
|
|
info->MCR |= UART_MCR_AFE;
|
|
} else {
|
|
mxser_handle_cts(tty, info,
|
|
inb(info->ioaddr + UART_MSR));
|
|
}
|
|
}
|
|
outb(info->MCR, info->ioaddr + UART_MCR);
|
|
tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
|
|
if (~cflag & CLOCAL)
|
|
info->IER |= UART_IER_MSI;
|
|
outb(info->IER, info->ioaddr + UART_IER);
|
|
|
|
/*
|
|
* Set up parity check flag
|
|
*/
|
|
info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
|
|
if (I_INPCK(tty))
|
|
info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
|
|
if (I_BRKINT(tty) || I_PARMRK(tty))
|
|
info->read_status_mask |= UART_LSR_BI;
|
|
|
|
info->ignore_status_mask = 0;
|
|
|
|
if (I_IGNBRK(tty)) {
|
|
info->ignore_status_mask |= UART_LSR_BI;
|
|
info->read_status_mask |= UART_LSR_BI;
|
|
/*
|
|
* If we're ignore parity and break indicators, ignore
|
|
* overruns too. (For real raw support).
|
|
*/
|
|
if (I_IGNPAR(tty)) {
|
|
info->ignore_status_mask |=
|
|
UART_LSR_OE |
|
|
UART_LSR_PE |
|
|
UART_LSR_FE;
|
|
info->read_status_mask |=
|
|
UART_LSR_OE |
|
|
UART_LSR_PE |
|
|
UART_LSR_FE;
|
|
}
|
|
}
|
|
if (info->board->must_hwid) {
|
|
mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
|
|
mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
|
|
mxser_must_set_rx_sw_flow_control(info->ioaddr, I_IXON(tty));
|
|
mxser_must_set_tx_sw_flow_control(info->ioaddr, I_IXOFF(tty));
|
|
}
|
|
|
|
|
|
outb(fcr, info->ioaddr + UART_FCR); /* set fcr */
|
|
outb(cval, info->ioaddr + UART_LCR);
|
|
}
|
|
|
|
static void mxser_check_modem_status(struct tty_struct *tty,
|
|
struct mxser_port *port, int status)
|
|
{
|
|
/* update input line counters */
|
|
if (status & UART_MSR_TERI)
|
|
port->icount.rng++;
|
|
if (status & UART_MSR_DDSR)
|
|
port->icount.dsr++;
|
|
if (status & UART_MSR_DDCD)
|
|
port->icount.dcd++;
|
|
if (status & UART_MSR_DCTS)
|
|
port->icount.cts++;
|
|
wake_up_interruptible(&port->port.delta_msr_wait);
|
|
|
|
if (tty_port_check_carrier(&port->port) && (status & UART_MSR_DDCD)) {
|
|
if (status & UART_MSR_DCD)
|
|
wake_up_interruptible(&port->port.open_wait);
|
|
}
|
|
|
|
if (tty_port_cts_enabled(&port->port))
|
|
mxser_handle_cts(tty, port, status);
|
|
}
|
|
|
|
static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
|
|
{
|
|
struct mxser_port *info = container_of(port, struct mxser_port, port);
|
|
unsigned long page;
|
|
unsigned long flags;
|
|
|
|
page = __get_free_page(GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
|
|
if (!info->type) {
|
|
set_bit(TTY_IO_ERROR, &tty->flags);
|
|
free_page(page);
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
return 0;
|
|
}
|
|
info->port.xmit_buf = (unsigned char *) page;
|
|
|
|
/*
|
|
* Clear the FIFO buffers and disable them
|
|
* (they will be reenabled in mxser_change_speed())
|
|
*/
|
|
if (info->board->must_hwid)
|
|
outb((UART_FCR_CLEAR_RCVR |
|
|
UART_FCR_CLEAR_XMIT |
|
|
MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
|
|
else
|
|
outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
|
|
info->ioaddr + UART_FCR);
|
|
|
|
/*
|
|
* At this point there's no way the LSR could still be 0xFF;
|
|
* if it is, then bail out, because there's likely no UART
|
|
* here.
|
|
*/
|
|
if (inb(info->ioaddr + UART_LSR) == 0xff) {
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
if (capable(CAP_SYS_ADMIN)) {
|
|
set_bit(TTY_IO_ERROR, &tty->flags);
|
|
return 0;
|
|
} else
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* Clear the interrupt registers.
|
|
*/
|
|
(void) inb(info->ioaddr + UART_LSR);
|
|
(void) inb(info->ioaddr + UART_RX);
|
|
(void) inb(info->ioaddr + UART_IIR);
|
|
(void) inb(info->ioaddr + UART_MSR);
|
|
|
|
/*
|
|
* Now, initialize the UART
|
|
*/
|
|
outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR); /* reset DLAB */
|
|
info->MCR = UART_MCR_DTR | UART_MCR_RTS;
|
|
outb(info->MCR, info->ioaddr + UART_MCR);
|
|
|
|
/*
|
|
* Finally, enable interrupts
|
|
*/
|
|
info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
|
|
|
|
if (info->board->must_hwid)
|
|
info->IER |= MOXA_MUST_IER_EGDAI;
|
|
outb(info->IER, info->ioaddr + UART_IER); /* enable interrupts */
|
|
|
|
/*
|
|
* And clear the interrupt registers again for luck.
|
|
*/
|
|
(void) inb(info->ioaddr + UART_LSR);
|
|
(void) inb(info->ioaddr + UART_RX);
|
|
(void) inb(info->ioaddr + UART_IIR);
|
|
(void) inb(info->ioaddr + UART_MSR);
|
|
|
|
clear_bit(TTY_IO_ERROR, &tty->flags);
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
|
|
/*
|
|
* and set the speed of the serial port
|
|
*/
|
|
mxser_change_speed(tty);
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This routine will shutdown a serial port
|
|
*/
|
|
static void mxser_shutdown_port(struct tty_port *port)
|
|
{
|
|
struct mxser_port *info = container_of(port, struct mxser_port, port);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
|
|
/*
|
|
* clear delta_msr_wait queue to avoid mem leaks: we may free the irq
|
|
* here so the queue might never be waken up
|
|
*/
|
|
wake_up_interruptible(&info->port.delta_msr_wait);
|
|
|
|
/*
|
|
* Free the xmit buffer, if necessary
|
|
*/
|
|
if (info->port.xmit_buf) {
|
|
free_page((unsigned long) info->port.xmit_buf);
|
|
info->port.xmit_buf = NULL;
|
|
}
|
|
|
|
info->IER = 0;
|
|
outb(0x00, info->ioaddr + UART_IER);
|
|
|
|
/* clear Rx/Tx FIFO's */
|
|
if (info->board->must_hwid)
|
|
outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
|
|
MOXA_MUST_FCR_GDA_MODE_ENABLE,
|
|
info->ioaddr + UART_FCR);
|
|
else
|
|
outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
|
|
info->ioaddr + UART_FCR);
|
|
|
|
/* read data port to reset things */
|
|
(void) inb(info->ioaddr + UART_RX);
|
|
|
|
|
|
if (info->board->must_hwid)
|
|
mxser_must_no_sw_flow_control(info->ioaddr);
|
|
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
}
|
|
|
|
/*
|
|
* This routine is called whenever a serial port is opened. It
|
|
* enables interrupts for a serial port, linking in its async structure into
|
|
* the IRQ chain. It also performs the serial-specific
|
|
* initialization for the tty structure.
|
|
*/
|
|
static int mxser_open(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
struct tty_port *tport = tty->port;
|
|
struct mxser_port *port = container_of(tport, struct mxser_port, port);
|
|
|
|
tty->driver_data = port;
|
|
|
|
return tty_port_open(tport, tty, filp);
|
|
}
|
|
|
|
static void mxser_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
char fcr;
|
|
unsigned long flags;
|
|
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
|
|
fcr = inb(info->ioaddr + UART_FCR);
|
|
outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
|
|
info->ioaddr + UART_FCR);
|
|
outb(fcr, info->ioaddr + UART_FCR);
|
|
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
|
|
tty_wakeup(tty);
|
|
}
|
|
|
|
|
|
static void mxser_close_port(struct tty_port *port)
|
|
{
|
|
struct mxser_port *info = container_of(port, struct mxser_port, port);
|
|
unsigned long timeout;
|
|
/*
|
|
* At this point we stop accepting input. To do this, we
|
|
* disable the receive line status interrupts, and tell the
|
|
* interrupt driver to stop checking the data ready bit in the
|
|
* line status register.
|
|
*/
|
|
info->IER &= ~UART_IER_RLSI;
|
|
if (info->board->must_hwid)
|
|
info->IER &= ~MOXA_MUST_RECV_ISR;
|
|
|
|
outb(info->IER, info->ioaddr + UART_IER);
|
|
/*
|
|
* Before we drop DTR, make sure the UART transmitter
|
|
* has completely drained; this is especially
|
|
* important if there is a transmit FIFO!
|
|
*/
|
|
timeout = jiffies + HZ;
|
|
while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
|
|
schedule_timeout_interruptible(5);
|
|
if (time_after(jiffies, timeout))
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This routine is called when the serial port gets closed. First, we
|
|
* wait for the last remaining data to be sent. Then, we unlink its
|
|
* async structure from the interrupt chain if necessary, and we free
|
|
* that IRQ if nothing is left in the chain.
|
|
*/
|
|
static void mxser_close(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
struct tty_port *port = &info->port;
|
|
|
|
if (info == NULL)
|
|
return;
|
|
if (tty_port_close_start(port, tty, filp) == 0)
|
|
return;
|
|
info->closing = 1;
|
|
mutex_lock(&port->mutex);
|
|
mxser_close_port(port);
|
|
mxser_flush_buffer(tty);
|
|
if (tty_port_initialized(port) && C_HUPCL(tty))
|
|
tty_port_lower_dtr_rts(port);
|
|
mxser_shutdown_port(port);
|
|
tty_port_set_initialized(port, 0);
|
|
mutex_unlock(&port->mutex);
|
|
info->closing = 0;
|
|
/* Right now the tty_port set is done outside of the close_end helper
|
|
as we don't yet have everyone using refcounts */
|
|
tty_port_close_end(port, tty);
|
|
tty_port_tty_set(port, NULL);
|
|
}
|
|
|
|
static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
|
|
{
|
|
int c, total = 0;
|
|
struct mxser_port *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (!info->port.xmit_buf)
|
|
return 0;
|
|
|
|
while (1) {
|
|
c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
|
|
SERIAL_XMIT_SIZE - info->xmit_head));
|
|
if (c <= 0)
|
|
break;
|
|
|
|
memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
info->xmit_head = (info->xmit_head + c) &
|
|
(SERIAL_XMIT_SIZE - 1);
|
|
info->xmit_cnt += c;
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
|
|
buf += c;
|
|
count -= c;
|
|
total += c;
|
|
}
|
|
|
|
if (info->xmit_cnt && !tty->flow.stopped)
|
|
if (!tty->hw_stopped || mxser_16550A_or_MUST(info))
|
|
mxser_start_tx(info);
|
|
|
|
return total;
|
|
}
|
|
|
|
static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (!info->port.xmit_buf)
|
|
return 0;
|
|
|
|
if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
info->port.xmit_buf[info->xmit_head++] = ch;
|
|
info->xmit_head &= SERIAL_XMIT_SIZE - 1;
|
|
info->xmit_cnt++;
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
static void mxser_flush_chars(struct tty_struct *tty)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
|
|
if (!info->xmit_cnt || tty->flow.stopped || !info->port.xmit_buf ||
|
|
(tty->hw_stopped && !mxser_16550A_or_MUST(info)))
|
|
return;
|
|
|
|
mxser_start_tx(info);
|
|
}
|
|
|
|
static unsigned int mxser_write_room(struct tty_struct *tty)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
int ret;
|
|
|
|
ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
|
|
return ret < 0 ? 0 : ret;
|
|
}
|
|
|
|
static unsigned int mxser_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
return info->xmit_cnt;
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* friends of mxser_ioctl()
|
|
* ------------------------------------------------------------
|
|
*/
|
|
static int mxser_get_serial_info(struct tty_struct *tty,
|
|
struct serial_struct *ss)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
struct tty_port *port = &info->port;
|
|
unsigned int closing_wait, close_delay;
|
|
|
|
mutex_lock(&port->mutex);
|
|
|
|
close_delay = jiffies_to_msecs(info->port.close_delay) / 10;
|
|
closing_wait = info->port.closing_wait;
|
|
if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
|
|
closing_wait = jiffies_to_msecs(closing_wait) / 10;
|
|
|
|
ss->type = info->type,
|
|
ss->line = tty->index,
|
|
ss->port = info->ioaddr,
|
|
ss->irq = info->board->irq,
|
|
ss->flags = info->port.flags,
|
|
ss->baud_base = MXSER_BAUD_BASE,
|
|
ss->close_delay = close_delay;
|
|
ss->closing_wait = closing_wait;
|
|
ss->custom_divisor = MXSER_CUSTOM_DIVISOR,
|
|
mutex_unlock(&port->mutex);
|
|
return 0;
|
|
}
|
|
|
|
static int mxser_set_serial_info(struct tty_struct *tty,
|
|
struct serial_struct *ss)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
struct tty_port *port = &info->port;
|
|
speed_t baud;
|
|
unsigned long sl_flags;
|
|
unsigned int old_speed, close_delay, closing_wait;
|
|
int retval = 0;
|
|
|
|
if (tty_io_error(tty))
|
|
return -EIO;
|
|
|
|
mutex_lock(&port->mutex);
|
|
|
|
if (ss->irq != info->board->irq ||
|
|
ss->port != info->ioaddr) {
|
|
mutex_unlock(&port->mutex);
|
|
return -EINVAL;
|
|
}
|
|
|
|
old_speed = port->flags & ASYNC_SPD_MASK;
|
|
|
|
close_delay = msecs_to_jiffies(ss->close_delay * 10);
|
|
closing_wait = ss->closing_wait;
|
|
if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
|
|
closing_wait = msecs_to_jiffies(closing_wait * 10);
|
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
if ((ss->baud_base != MXSER_BAUD_BASE) ||
|
|
(close_delay != port->close_delay) ||
|
|
(closing_wait != port->closing_wait) ||
|
|
((ss->flags & ~ASYNC_USR_MASK) != (port->flags & ~ASYNC_USR_MASK))) {
|
|
mutex_unlock(&port->mutex);
|
|
return -EPERM;
|
|
}
|
|
port->flags = (port->flags & ~ASYNC_USR_MASK) |
|
|
(ss->flags & ASYNC_USR_MASK);
|
|
} else {
|
|
/*
|
|
* OK, past this point, all the error checking has been done.
|
|
* At this point, we start making changes.....
|
|
*/
|
|
port->flags = ((port->flags & ~ASYNC_FLAGS) |
|
|
(ss->flags & ASYNC_FLAGS));
|
|
port->close_delay = close_delay;
|
|
port->closing_wait = closing_wait;
|
|
if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
|
|
(ss->baud_base != MXSER_BAUD_BASE ||
|
|
ss->custom_divisor !=
|
|
MXSER_CUSTOM_DIVISOR)) {
|
|
if (ss->custom_divisor == 0) {
|
|
mutex_unlock(&port->mutex);
|
|
return -EINVAL;
|
|
}
|
|
baud = ss->baud_base / ss->custom_divisor;
|
|
tty_encode_baud_rate(tty, baud, baud);
|
|
}
|
|
|
|
info->type = ss->type;
|
|
|
|
mxser_process_txrx_fifo(info);
|
|
}
|
|
|
|
if (tty_port_initialized(port)) {
|
|
if (old_speed != (port->flags & ASYNC_SPD_MASK)) {
|
|
spin_lock_irqsave(&info->slock, sl_flags);
|
|
mxser_change_speed(tty);
|
|
spin_unlock_irqrestore(&info->slock, sl_flags);
|
|
}
|
|
} else {
|
|
retval = mxser_activate(port, tty);
|
|
if (retval == 0)
|
|
tty_port_set_initialized(port, 1);
|
|
}
|
|
mutex_unlock(&port->mutex);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* mxser_get_lsr_info - get line status register info
|
|
*
|
|
* Purpose: Let user call ioctl() to get info when the UART physically
|
|
* is emptied. On bus types like RS485, the transmitter must
|
|
* release the bus after transmitting. This must be done when
|
|
* the transmit shift register is empty, not be done when the
|
|
* transmit holding register is empty. This functionality
|
|
* allows an RS485 driver to be written in user space.
|
|
*/
|
|
static int mxser_get_lsr_info(struct mxser_port *info,
|
|
unsigned int __user *value)
|
|
{
|
|
unsigned char status;
|
|
unsigned int result;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
status = inb(info->ioaddr + UART_LSR);
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
|
|
return put_user(result, value);
|
|
}
|
|
|
|
static int mxser_tiocmget(struct tty_struct *tty)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
unsigned char control, status;
|
|
unsigned long flags;
|
|
|
|
if (tty_io_error(tty))
|
|
return -EIO;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
control = info->MCR;
|
|
status = inb(info->ioaddr + UART_MSR);
|
|
if (status & UART_MSR_ANY_DELTA)
|
|
mxser_check_modem_status(tty, info, status);
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
|
|
return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
|
|
((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
|
|
((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
|
|
((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
|
|
((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
|
|
((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
|
|
}
|
|
|
|
static int mxser_tiocmset(struct tty_struct *tty,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (tty_io_error(tty))
|
|
return -EIO;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
|
|
if (set & TIOCM_RTS)
|
|
info->MCR |= UART_MCR_RTS;
|
|
if (set & TIOCM_DTR)
|
|
info->MCR |= UART_MCR_DTR;
|
|
|
|
if (clear & TIOCM_RTS)
|
|
info->MCR &= ~UART_MCR_RTS;
|
|
if (clear & TIOCM_DTR)
|
|
info->MCR &= ~UART_MCR_DTR;
|
|
|
|
outb(info->MCR, info->ioaddr + UART_MCR);
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
return 0;
|
|
}
|
|
|
|
static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
|
|
struct async_icount *cprev)
|
|
{
|
|
struct async_icount cnow;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
cnow = info->icount; /* atomic copy */
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
|
|
ret = ((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));
|
|
|
|
*cprev = cnow;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* We should likely switch to TIOCGRS485/TIOCSRS485. */
|
|
static int mxser_ioctl_op_mode(struct mxser_port *port, int index, bool set,
|
|
int __user *u_opmode)
|
|
{
|
|
int opmode, p = index % 4;
|
|
int shiftbit = p * 2;
|
|
u8 val;
|
|
|
|
if (port->board->must_hwid != MOXA_MUST_MU860_HWID)
|
|
return -EFAULT;
|
|
|
|
if (set) {
|
|
if (get_user(opmode, u_opmode))
|
|
return -EFAULT;
|
|
|
|
if (opmode & ~OP_MODE_MASK)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irq(&port->slock);
|
|
val = inb(port->opmode_ioaddr);
|
|
val &= ~(OP_MODE_MASK << shiftbit);
|
|
val |= (opmode << shiftbit);
|
|
outb(val, port->opmode_ioaddr);
|
|
spin_unlock_irq(&port->slock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
spin_lock_irq(&port->slock);
|
|
opmode = inb(port->opmode_ioaddr) >> shiftbit;
|
|
spin_unlock_irq(&port->slock);
|
|
|
|
return put_user(opmode & OP_MODE_MASK, u_opmode);
|
|
}
|
|
|
|
static int mxser_ioctl(struct tty_struct *tty,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
struct async_icount cnow;
|
|
unsigned long flags;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE)
|
|
return mxser_ioctl_op_mode(info, tty->index,
|
|
cmd == MOXA_SET_OP_MODE, argp);
|
|
|
|
if (cmd != TIOCMIWAIT && tty_io_error(tty))
|
|
return -EIO;
|
|
|
|
switch (cmd) {
|
|
case TIOCSERGETLSR: /* Get line status register */
|
|
return mxser_get_lsr_info(info, argp);
|
|
/*
|
|
* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
|
|
* - mask passed in arg for lines of interest
|
|
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
|
|
* Caller should use TIOCGICOUNT to see which one it was
|
|
*/
|
|
case TIOCMIWAIT:
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
cnow = info->icount; /* note the counters on entry */
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
|
|
return wait_event_interruptible(info->port.delta_msr_wait,
|
|
mxser_cflags_changed(info, arg, &cnow));
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
static int mxser_get_icount(struct tty_struct *tty,
|
|
struct serial_icounter_struct *icount)
|
|
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
struct async_icount cnow;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
cnow = info->icount;
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
|
|
icount->frame = cnow.frame;
|
|
icount->brk = cnow.brk;
|
|
icount->overrun = cnow.overrun;
|
|
icount->buf_overrun = cnow.buf_overrun;
|
|
icount->parity = cnow.parity;
|
|
icount->rx = cnow.rx;
|
|
icount->tx = cnow.tx;
|
|
icount->cts = cnow.cts;
|
|
icount->dsr = cnow.dsr;
|
|
icount->rng = cnow.rng;
|
|
icount->dcd = cnow.dcd;
|
|
return 0;
|
|
}
|
|
|
|
static void mxser_stoprx(struct tty_struct *tty)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
|
|
info->ldisc_stop_rx = 1;
|
|
if (I_IXOFF(tty)) {
|
|
if (info->board->must_hwid) {
|
|
info->IER &= ~MOXA_MUST_RECV_ISR;
|
|
outb(info->IER, info->ioaddr + UART_IER);
|
|
} else {
|
|
info->x_char = STOP_CHAR(tty);
|
|
outb(0, info->ioaddr + UART_IER);
|
|
info->IER |= UART_IER_THRI;
|
|
outb(info->IER, info->ioaddr + UART_IER);
|
|
}
|
|
}
|
|
|
|
if (C_CRTSCTS(tty)) {
|
|
info->MCR &= ~UART_MCR_RTS;
|
|
outb(info->MCR, info->ioaddr + UART_MCR);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This routine is called by the upper-layer tty layer to signal that
|
|
* incoming characters should be throttled.
|
|
*/
|
|
static void mxser_throttle(struct tty_struct *tty)
|
|
{
|
|
mxser_stoprx(tty);
|
|
}
|
|
|
|
static void mxser_unthrottle(struct tty_struct *tty)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
|
|
/* startrx */
|
|
info->ldisc_stop_rx = 0;
|
|
if (I_IXOFF(tty)) {
|
|
if (info->x_char)
|
|
info->x_char = 0;
|
|
else {
|
|
if (info->board->must_hwid) {
|
|
info->IER |= MOXA_MUST_RECV_ISR;
|
|
outb(info->IER, info->ioaddr + UART_IER);
|
|
} else {
|
|
info->x_char = START_CHAR(tty);
|
|
outb(0, info->ioaddr + UART_IER);
|
|
info->IER |= UART_IER_THRI;
|
|
outb(info->IER, info->ioaddr + UART_IER);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (C_CRTSCTS(tty)) {
|
|
info->MCR |= UART_MCR_RTS;
|
|
outb(info->MCR, info->ioaddr + UART_MCR);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* mxser_stop() and mxser_start()
|
|
*
|
|
* This routines are called before setting or resetting tty->flow.stopped.
|
|
* They enable or disable transmitter interrupts, as necessary.
|
|
*/
|
|
static void mxser_stop(struct tty_struct *tty)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
if (info->IER & UART_IER_THRI)
|
|
__mxser_stop_tx(info);
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
}
|
|
|
|
static void mxser_start(struct tty_struct *tty)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
if (info->xmit_cnt && info->port.xmit_buf)
|
|
__mxser_start_tx(info);
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
}
|
|
|
|
static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
mxser_change_speed(tty);
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
|
|
if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
|
|
tty->hw_stopped = 0;
|
|
mxser_start(tty);
|
|
}
|
|
|
|
/* Handle sw stopped */
|
|
if ((old_termios->c_iflag & IXON) && !I_IXON(tty)) {
|
|
tty->flow.stopped = 0;
|
|
|
|
if (info->board->must_hwid) {
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
mxser_must_set_rx_sw_flow_control(info->ioaddr, false);
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
}
|
|
|
|
mxser_start(tty);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* mxser_wait_until_sent() --- wait until the transmitter is empty
|
|
*/
|
|
static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
unsigned long orig_jiffies, char_time;
|
|
unsigned long flags;
|
|
int lsr;
|
|
|
|
if (info->type == PORT_UNKNOWN)
|
|
return;
|
|
|
|
if (info->xmit_fifo_size == 0)
|
|
return; /* Just in case.... */
|
|
|
|
orig_jiffies = jiffies;
|
|
/*
|
|
* Set the check interval to be 1/5 of the estimated time to
|
|
* send a single character, and make it at least 1. The check
|
|
* interval should also be less than the timeout.
|
|
*
|
|
* Note: we have to use pretty tight timings here to satisfy
|
|
* the NIST-PCTS.
|
|
*/
|
|
char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
|
|
char_time = char_time / 5;
|
|
if (char_time == 0)
|
|
char_time = 1;
|
|
if (timeout && timeout < char_time)
|
|
char_time = timeout;
|
|
/*
|
|
* If the transmitter hasn't cleared in twice the approximate
|
|
* amount of time to send the entire FIFO, it probably won't
|
|
* ever clear. This assumes the UART isn't doing flow
|
|
* control, which is currently the case. Hence, if it ever
|
|
* takes longer than info->timeout, this is probably due to a
|
|
* UART bug of some kind. So, we clamp the timeout parameter at
|
|
* 2*info->timeout.
|
|
*/
|
|
if (!timeout || timeout > 2 * info->timeout)
|
|
timeout = 2 * info->timeout;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
schedule_timeout_interruptible(char_time);
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
if (signal_pending(current))
|
|
break;
|
|
if (timeout && time_after(jiffies, orig_jiffies + timeout))
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
set_current_state(TASK_RUNNING);
|
|
}
|
|
|
|
/*
|
|
* This routine is called by tty_hangup() when a hangup is signaled.
|
|
*/
|
|
static void mxser_hangup(struct tty_struct *tty)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
|
|
mxser_flush_buffer(tty);
|
|
tty_port_hangup(&info->port);
|
|
}
|
|
|
|
/*
|
|
* mxser_rs_break() --- routine which turns the break handling on or off
|
|
*/
|
|
static int mxser_rs_break(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct mxser_port *info = tty->driver_data;
|
|
unsigned long flags;
|
|
u8 lcr;
|
|
|
|
spin_lock_irqsave(&info->slock, flags);
|
|
lcr = inb(info->ioaddr + UART_LCR);
|
|
if (break_state == -1)
|
|
lcr |= UART_LCR_SBC;
|
|
else
|
|
lcr &= ~UART_LCR_SBC;
|
|
outb(lcr, info->ioaddr + UART_LCR);
|
|
spin_unlock_irqrestore(&info->slock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool mxser_receive_chars_new(struct tty_struct *tty,
|
|
struct mxser_port *port, u8 status)
|
|
{
|
|
enum mxser_must_hwid hwid = port->board->must_hwid;
|
|
u8 gdl;
|
|
|
|
if (hwid == MOXA_OTHER_UART)
|
|
return false;
|
|
if (status & UART_LSR_BRK_ERROR_BITS)
|
|
return false;
|
|
if (hwid == MOXA_MUST_MU860_HWID && (status & MOXA_MUST_LSR_RERR))
|
|
return false;
|
|
if (status & MOXA_MUST_LSR_RERR)
|
|
return false;
|
|
|
|
gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
|
|
if (hwid == MOXA_MUST_MU150_HWID)
|
|
gdl &= MOXA_MUST_GDL_MASK;
|
|
|
|
if (gdl >= tty->receive_room && !port->ldisc_stop_rx)
|
|
mxser_stoprx(tty);
|
|
|
|
while (gdl--) {
|
|
u8 ch = inb(port->ioaddr + UART_RX);
|
|
tty_insert_flip_char(&port->port, ch, 0);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static u8 mxser_receive_chars_old(struct tty_struct *tty,
|
|
struct mxser_port *port, u8 status)
|
|
{
|
|
enum mxser_must_hwid hwid = port->board->must_hwid;
|
|
int recv_room = tty->receive_room;
|
|
int ignored = 0;
|
|
int max = 256;
|
|
int cnt = 0;
|
|
u8 ch;
|
|
|
|
do {
|
|
if (max-- < 0)
|
|
break;
|
|
|
|
ch = inb(port->ioaddr + UART_RX);
|
|
if (hwid && (status & UART_LSR_OE))
|
|
outb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
|
|
MOXA_MUST_FCR_GDA_MODE_ENABLE,
|
|
port->ioaddr + UART_FCR);
|
|
status &= port->read_status_mask;
|
|
if (status & port->ignore_status_mask) {
|
|
if (++ignored > 100)
|
|
break;
|
|
} else {
|
|
char flag = 0;
|
|
if (status & UART_LSR_BRK_ERROR_BITS) {
|
|
if (status & UART_LSR_BI) {
|
|
flag = TTY_BREAK;
|
|
port->icount.brk++;
|
|
|
|
if (port->port.flags & ASYNC_SAK)
|
|
do_SAK(tty);
|
|
} else if (status & UART_LSR_PE) {
|
|
flag = TTY_PARITY;
|
|
port->icount.parity++;
|
|
} else if (status & UART_LSR_FE) {
|
|
flag = TTY_FRAME;
|
|
port->icount.frame++;
|
|
} else if (status & UART_LSR_OE) {
|
|
flag = TTY_OVERRUN;
|
|
port->icount.overrun++;
|
|
}
|
|
}
|
|
tty_insert_flip_char(&port->port, ch, flag);
|
|
cnt++;
|
|
if (cnt >= recv_room) {
|
|
if (!port->ldisc_stop_rx)
|
|
mxser_stoprx(tty);
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
if (hwid)
|
|
break;
|
|
|
|
status = inb(port->ioaddr + UART_LSR);
|
|
} while (status & UART_LSR_DR);
|
|
|
|
return status;
|
|
}
|
|
|
|
static u8 mxser_receive_chars(struct tty_struct *tty,
|
|
struct mxser_port *port, u8 status)
|
|
{
|
|
if (tty->receive_room == 0 && !port->ldisc_stop_rx)
|
|
mxser_stoprx(tty);
|
|
|
|
if (!mxser_receive_chars_new(tty, port, status))
|
|
status = mxser_receive_chars_old(tty, port, status);
|
|
|
|
tty_flip_buffer_push(&port->port);
|
|
|
|
return status;
|
|
}
|
|
|
|
static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
|
|
{
|
|
int count, cnt;
|
|
|
|
if (port->x_char) {
|
|
outb(port->x_char, port->ioaddr + UART_TX);
|
|
port->x_char = 0;
|
|
port->icount.tx++;
|
|
return;
|
|
}
|
|
|
|
if (port->port.xmit_buf == NULL)
|
|
return;
|
|
|
|
if (!port->xmit_cnt || tty->flow.stopped ||
|
|
(tty->hw_stopped && !mxser_16550A_or_MUST(port))) {
|
|
__mxser_stop_tx(port);
|
|
return;
|
|
}
|
|
|
|
cnt = port->xmit_cnt;
|
|
count = port->xmit_fifo_size;
|
|
do {
|
|
outb(port->port.xmit_buf[port->xmit_tail++],
|
|
port->ioaddr + UART_TX);
|
|
port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
|
|
if (!--port->xmit_cnt)
|
|
break;
|
|
} while (--count > 0);
|
|
|
|
port->icount.tx += (cnt - port->xmit_cnt);
|
|
|
|
if (port->xmit_cnt < WAKEUP_CHARS)
|
|
tty_wakeup(tty);
|
|
|
|
if (!port->xmit_cnt)
|
|
__mxser_stop_tx(port);
|
|
}
|
|
|
|
static bool mxser_port_isr(struct mxser_port *port)
|
|
{
|
|
struct tty_struct *tty;
|
|
u8 iir, msr, status;
|
|
bool error = false;
|
|
|
|
iir = inb(port->ioaddr + UART_IIR);
|
|
if (iir & UART_IIR_NO_INT)
|
|
return true;
|
|
|
|
iir &= MOXA_MUST_IIR_MASK;
|
|
tty = tty_port_tty_get(&port->port);
|
|
if (!tty || port->closing || !tty_port_initialized(&port->port)) {
|
|
status = inb(port->ioaddr + UART_LSR);
|
|
outb(MOXA_MUST_FCR_GDA_MODE_ENABLE | UART_FCR_ENABLE_FIFO |
|
|
UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
|
|
port->ioaddr + UART_FCR);
|
|
inb(port->ioaddr + UART_MSR);
|
|
|
|
error = true;
|
|
goto put_tty;
|
|
}
|
|
|
|
status = inb(port->ioaddr + UART_LSR);
|
|
|
|
if (port->board->must_hwid) {
|
|
if (iir == MOXA_MUST_IIR_GDA ||
|
|
iir == MOXA_MUST_IIR_RDA ||
|
|
iir == MOXA_MUST_IIR_RTO ||
|
|
iir == MOXA_MUST_IIR_LSR)
|
|
status = mxser_receive_chars(tty, port, status);
|
|
} else {
|
|
status &= port->read_status_mask;
|
|
if (status & UART_LSR_DR)
|
|
status = mxser_receive_chars(tty, port, status);
|
|
}
|
|
|
|
msr = inb(port->ioaddr + UART_MSR);
|
|
if (msr & UART_MSR_ANY_DELTA)
|
|
mxser_check_modem_status(tty, port, msr);
|
|
|
|
if (port->board->must_hwid) {
|
|
if (iir == 0x02 && (status & UART_LSR_THRE))
|
|
mxser_transmit_chars(tty, port);
|
|
} else {
|
|
if (status & UART_LSR_THRE)
|
|
mxser_transmit_chars(tty, port);
|
|
}
|
|
|
|
put_tty:
|
|
tty_kref_put(tty);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* This is the serial driver's generic interrupt routine
|
|
*/
|
|
static irqreturn_t mxser_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct mxser_board *brd = dev_id;
|
|
struct mxser_port *port;
|
|
unsigned int int_cnt, pass_counter = 0;
|
|
unsigned int i, max = brd->nports;
|
|
int handled = IRQ_NONE;
|
|
u8 irqbits, bits, mask = BIT(max) - 1;
|
|
|
|
while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
|
|
irqbits = inb(brd->vector) & mask;
|
|
if (irqbits == mask)
|
|
break;
|
|
|
|
handled = IRQ_HANDLED;
|
|
for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
|
|
if (irqbits == mask)
|
|
break;
|
|
if (bits & irqbits)
|
|
continue;
|
|
port = &brd->ports[i];
|
|
|
|
int_cnt = 0;
|
|
spin_lock(&port->slock);
|
|
do {
|
|
if (mxser_port_isr(port))
|
|
break;
|
|
} while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
|
|
spin_unlock(&port->slock);
|
|
}
|
|
}
|
|
|
|
return handled;
|
|
}
|
|
|
|
static const struct tty_operations mxser_ops = {
|
|
.open = mxser_open,
|
|
.close = mxser_close,
|
|
.write = mxser_write,
|
|
.put_char = mxser_put_char,
|
|
.flush_chars = mxser_flush_chars,
|
|
.write_room = mxser_write_room,
|
|
.chars_in_buffer = mxser_chars_in_buffer,
|
|
.flush_buffer = mxser_flush_buffer,
|
|
.ioctl = mxser_ioctl,
|
|
.throttle = mxser_throttle,
|
|
.unthrottle = mxser_unthrottle,
|
|
.set_termios = mxser_set_termios,
|
|
.stop = mxser_stop,
|
|
.start = mxser_start,
|
|
.hangup = mxser_hangup,
|
|
.break_ctl = mxser_rs_break,
|
|
.wait_until_sent = mxser_wait_until_sent,
|
|
.tiocmget = mxser_tiocmget,
|
|
.tiocmset = mxser_tiocmset,
|
|
.set_serial = mxser_set_serial_info,
|
|
.get_serial = mxser_get_serial_info,
|
|
.get_icount = mxser_get_icount,
|
|
};
|
|
|
|
static const struct tty_port_operations mxser_port_ops = {
|
|
.carrier_raised = mxser_carrier_raised,
|
|
.dtr_rts = mxser_dtr_rts,
|
|
.activate = mxser_activate,
|
|
.shutdown = mxser_shutdown_port,
|
|
};
|
|
|
|
/*
|
|
* The MOXA Smartio/Industio serial driver boot-time initialization code!
|
|
*/
|
|
|
|
static void mxser_initbrd(struct mxser_board *brd, bool high_baud)
|
|
{
|
|
struct mxser_port *info;
|
|
unsigned int i;
|
|
bool is_mu860;
|
|
|
|
brd->must_hwid = mxser_must_get_hwid(brd->ports[0].ioaddr);
|
|
is_mu860 = brd->must_hwid == MOXA_MUST_MU860_HWID;
|
|
|
|
for (i = 0; i < UART_INFO_NUM; i++) {
|
|
if (Gpci_uart_info[i].type == brd->must_hwid) {
|
|
brd->max_baud = Gpci_uart_info[i].max_baud;
|
|
|
|
/* exception....CP-102 */
|
|
if (high_baud)
|
|
brd->max_baud = 921600;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (is_mu860) {
|
|
/* set to RS232 mode by default */
|
|
outb(0, brd->vector + 4);
|
|
outb(0, brd->vector + 0x0c);
|
|
}
|
|
|
|
for (i = 0; i < brd->nports; i++) {
|
|
info = &brd->ports[i];
|
|
if (is_mu860) {
|
|
if (i < 4)
|
|
info->opmode_ioaddr = brd->vector + 4;
|
|
else
|
|
info->opmode_ioaddr = brd->vector + 0x0c;
|
|
}
|
|
tty_port_init(&info->port);
|
|
info->port.ops = &mxser_port_ops;
|
|
info->board = brd;
|
|
info->ldisc_stop_rx = 0;
|
|
|
|
/* Enhance mode enabled here */
|
|
if (brd->must_hwid != MOXA_OTHER_UART)
|
|
mxser_must_set_enhance_mode(info->ioaddr, true);
|
|
|
|
info->type = PORT_16550A;
|
|
|
|
mxser_process_txrx_fifo(info);
|
|
|
|
info->port.close_delay = 5 * HZ / 10;
|
|
info->port.closing_wait = 30 * HZ;
|
|
spin_lock_init(&info->slock);
|
|
|
|
/* before set INT ISR, disable all int */
|
|
outb(inb(info->ioaddr + UART_IER) & 0xf0,
|
|
info->ioaddr + UART_IER);
|
|
}
|
|
}
|
|
|
|
static int mxser_probe(struct pci_dev *pdev,
|
|
const struct pci_device_id *ent)
|
|
{
|
|
struct mxser_board *brd;
|
|
unsigned int i, base;
|
|
unsigned long ioaddress;
|
|
unsigned short nports = MXSER_NPORTS(ent->driver_data);
|
|
struct device *tty_dev;
|
|
int retval = -EINVAL;
|
|
|
|
i = find_first_zero_bit(mxser_boards, MXSER_BOARDS);
|
|
if (i >= MXSER_BOARDS) {
|
|
dev_err(&pdev->dev, "too many boards found (maximum %d), board "
|
|
"not configured\n", MXSER_BOARDS);
|
|
goto err;
|
|
}
|
|
|
|
brd = devm_kzalloc(&pdev->dev, struct_size(brd, ports, nports),
|
|
GFP_KERNEL);
|
|
if (!brd)
|
|
goto err;
|
|
|
|
brd->idx = i;
|
|
__set_bit(brd->idx, mxser_boards);
|
|
base = i * MXSER_PORTS_PER_BOARD;
|
|
|
|
retval = pcim_enable_device(pdev);
|
|
if (retval) {
|
|
dev_err(&pdev->dev, "PCI enable failed\n");
|
|
goto err_zero;
|
|
}
|
|
|
|
/* io address */
|
|
ioaddress = pci_resource_start(pdev, 2);
|
|
retval = pci_request_region(pdev, 2, "mxser(IO)");
|
|
if (retval)
|
|
goto err_zero;
|
|
|
|
brd->nports = nports;
|
|
for (i = 0; i < nports; i++)
|
|
brd->ports[i].ioaddr = ioaddress + 8 * i;
|
|
|
|
/* vector */
|
|
ioaddress = pci_resource_start(pdev, 3);
|
|
retval = pci_request_region(pdev, 3, "mxser(vector)");
|
|
if (retval)
|
|
goto err_zero;
|
|
brd->vector = ioaddress;
|
|
|
|
/* irq */
|
|
brd->irq = pdev->irq;
|
|
|
|
mxser_initbrd(brd, ent->driver_data & MXSER_HIGHBAUD);
|
|
|
|
retval = devm_request_irq(&pdev->dev, brd->irq, mxser_interrupt,
|
|
IRQF_SHARED, "mxser", brd);
|
|
if (retval) {
|
|
dev_err(&pdev->dev, "request irq failed");
|
|
goto err_relbrd;
|
|
}
|
|
|
|
for (i = 0; i < nports; i++) {
|
|
tty_dev = tty_port_register_device(&brd->ports[i].port,
|
|
mxvar_sdriver, base + i, &pdev->dev);
|
|
if (IS_ERR(tty_dev)) {
|
|
retval = PTR_ERR(tty_dev);
|
|
for (; i > 0; i--)
|
|
tty_unregister_device(mxvar_sdriver,
|
|
base + i - 1);
|
|
goto err_relbrd;
|
|
}
|
|
}
|
|
|
|
pci_set_drvdata(pdev, brd);
|
|
|
|
return 0;
|
|
err_relbrd:
|
|
for (i = 0; i < nports; i++)
|
|
tty_port_destroy(&brd->ports[i].port);
|
|
err_zero:
|
|
__clear_bit(brd->idx, mxser_boards);
|
|
err:
|
|
return retval;
|
|
}
|
|
|
|
static void mxser_remove(struct pci_dev *pdev)
|
|
{
|
|
struct mxser_board *brd = pci_get_drvdata(pdev);
|
|
unsigned int i, base = brd->idx * MXSER_PORTS_PER_BOARD;
|
|
|
|
for (i = 0; i < brd->nports; i++) {
|
|
tty_unregister_device(mxvar_sdriver, base + i);
|
|
tty_port_destroy(&brd->ports[i].port);
|
|
}
|
|
|
|
__clear_bit(brd->idx, mxser_boards);
|
|
}
|
|
|
|
static struct pci_driver mxser_driver = {
|
|
.name = "mxser",
|
|
.id_table = mxser_pcibrds,
|
|
.probe = mxser_probe,
|
|
.remove = mxser_remove
|
|
};
|
|
|
|
static int __init mxser_module_init(void)
|
|
{
|
|
int retval;
|
|
|
|
mxvar_sdriver = alloc_tty_driver(MXSER_PORTS);
|
|
if (!mxvar_sdriver)
|
|
return -ENOMEM;
|
|
|
|
/* Initialize the tty_driver structure */
|
|
mxvar_sdriver->name = "ttyMI";
|
|
mxvar_sdriver->major = ttymajor;
|
|
mxvar_sdriver->minor_start = 0;
|
|
mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
|
|
mxvar_sdriver->init_termios = tty_std_termios;
|
|
mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
|
|
mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
|
|
tty_set_operations(mxvar_sdriver, &mxser_ops);
|
|
|
|
retval = tty_register_driver(mxvar_sdriver);
|
|
if (retval) {
|
|
printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
|
|
"tty driver !\n");
|
|
goto err_put;
|
|
}
|
|
|
|
retval = pci_register_driver(&mxser_driver);
|
|
if (retval) {
|
|
printk(KERN_ERR "mxser: can't register pci driver\n");
|
|
goto err_unr;
|
|
}
|
|
|
|
return 0;
|
|
err_unr:
|
|
tty_unregister_driver(mxvar_sdriver);
|
|
err_put:
|
|
put_tty_driver(mxvar_sdriver);
|
|
return retval;
|
|
}
|
|
|
|
static void __exit mxser_module_exit(void)
|
|
{
|
|
pci_unregister_driver(&mxser_driver);
|
|
tty_unregister_driver(mxvar_sdriver);
|
|
put_tty_driver(mxvar_sdriver);
|
|
}
|
|
|
|
module_init(mxser_module_init);
|
|
module_exit(mxser_module_exit);
|