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linux-next/drivers/tty/mxser.c
Colin Ian King e4cdd25caf tty: mxser: remove redundant assignment to hwid 
The variable hwid is assigned a value but it is never read. The
assignment is redundant and can be removed.

Cleans up clang scan build warning:
drivers/tty/mxser.c:401:7: warning: Although the value stored to 'hwid'
is used in the enclosing expression, the value is never actually read
from 'hwid' [deadcode.DeadStores]

Acked-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20220730130925.150018-1-colin.i.king@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-09-01 17:59:36 +02:00

1939 lines
49 KiB
C
Raw Blame History

// 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_MOXA_RC7000 0x0001
#define PCI_DEVICE_ID_MOXA_CP102 0x1020
#define PCI_DEVICE_ID_MOXA_CP102UL 0x1021
#define PCI_DEVICE_ID_MOXA_CP102U 0x1022
#define PCI_DEVICE_ID_MOXA_CP102UF 0x1023
#define PCI_DEVICE_ID_MOXA_C104 0x1040
#define PCI_DEVICE_ID_MOXA_CP104U 0x1041
#define PCI_DEVICE_ID_MOXA_CP104JU 0x1042
#define PCI_DEVICE_ID_MOXA_CP104EL 0x1043
#define PCI_DEVICE_ID_MOXA_POS104UL 0x1044
#define PCI_DEVICE_ID_MOXA_CB108 0x1080
#define PCI_DEVICE_ID_MOXA_CP112UL 0x1120
#define PCI_DEVICE_ID_MOXA_CT114 0x1140
#define PCI_DEVICE_ID_MOXA_CP114 0x1141
#define PCI_DEVICE_ID_MOXA_CB114 0x1142
#define PCI_DEVICE_ID_MOXA_CP114UL 0x1143
#define PCI_DEVICE_ID_MOXA_CP118U 0x1180
#define PCI_DEVICE_ID_MOXA_CP118EL 0x1181
#define PCI_DEVICE_ID_MOXA_CP132 0x1320
#define PCI_DEVICE_ID_MOXA_CP132U 0x1321
#define PCI_DEVICE_ID_MOXA_CP134U 0x1340
#define PCI_DEVICE_ID_MOXA_CB134I 0x1341
#define PCI_DEVICE_ID_MOXA_CP138U 0x1380
#define PCI_DEVICE_ID_MOXA_C168 0x1680
#define PCI_DEVICE_ID_MOXA_CP168U 0x1681
#define PCI_DEVICE_ID_MOXA_CP168EL 0x1682
#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_DEVICE_DATA(MOXA, C168, 8) },
{ PCI_DEVICE_DATA(MOXA, C104, 4) },
{ PCI_DEVICE_DATA(MOXA, CP132, 2) },
{ PCI_DEVICE_DATA(MOXA, CP114, 4) },
{ PCI_DEVICE_DATA(MOXA, CT114, 4) },
{ PCI_DEVICE_DATA(MOXA, CP102, 2 | MXSER_HIGHBAUD) },
{ PCI_DEVICE_DATA(MOXA, CP104U, 4) },
{ PCI_DEVICE_DATA(MOXA, CP168U, 8) },
{ PCI_DEVICE_DATA(MOXA, CP132U, 2) },
{ PCI_DEVICE_DATA(MOXA, CP134U, 4) },
{ PCI_DEVICE_DATA(MOXA, CP104JU, 4) },
{ PCI_DEVICE_DATA(MOXA, RC7000, 8) }, /* RC7000 */
{ PCI_DEVICE_DATA(MOXA, CP118U, 8) },
{ PCI_DEVICE_DATA(MOXA, CP102UL, 2) },
{ PCI_DEVICE_DATA(MOXA, CP102U, 2) },
{ PCI_DEVICE_DATA(MOXA, CP118EL, 8) },
{ PCI_DEVICE_DATA(MOXA, CP168EL, 8) },
{ PCI_DEVICE_DATA(MOXA, CP104EL, 4) },
{ PCI_DEVICE_DATA(MOXA, CB108, 8) },
{ PCI_DEVICE_DATA(MOXA, CB114, 4) },
{ PCI_DEVICE_DATA(MOXA, CB134I, 4) },
{ PCI_DEVICE_DATA(MOXA, CP138U, 8) },
{ PCI_DEVICE_DATA(MOXA, POS104UL, 4) },
{ PCI_DEVICE_DATA(MOXA, CP114UL, 4) },
{ PCI_DEVICE_DATA(MOXA, CP102UF, 2) },
{ PCI_DEVICE_DATA(MOXA, CP112UL, 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 */
u8 FCR; /* FIFO control register */
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;
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 (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 */
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 {
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,
const struct ktermios *old_termios)
{
struct mxser_port *info = tty->driver_data;
unsigned cflag, cval;
cflag = tty->termios.c_cflag;
if (mxser_set_baud(tty, tty_get_baud_rate(tty))) {
/* Use previous rate on a failure */
if (old_termios) {
speed_t baud = tty_termios_baud_rate(old_termios);
tty_encode_baud_rate(tty, baud, baud);
}
}
/* byte size and parity */
cval = UART_LCR_WLEN(tty_get_char_size(tty->termios.c_cflag));
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;
info->FCR = 0;
if (info->board->must_hwid) {
info->FCR |= UART_FCR_ENABLE_FIFO |
MOXA_MUST_FCR_GDA_MODE_ENABLE;
mxser_set_must_fifo_value(info);
} else if (info->type != PORT_8250 && info->type != PORT_16450) {
info->FCR |= UART_FCR_ENABLE_FIFO;
switch (info->rx_high_water) {
case 1:
info->FCR |= UART_FCR_TRIGGER_1;
break;
case 4:
info->FCR |= UART_FCR_TRIGGER_4;
break;
case 8:
info->FCR |= UART_FCR_TRIGGER_8;
break;
default:
info->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(info->FCR, info->ioaddr + UART_FCR);
outb(cval, info->ioaddr + UART_LCR);
}
static u8 mxser_check_modem_status(struct tty_struct *tty,
struct mxser_port *port)
{
u8 msr = inb(port->ioaddr + UART_MSR);
if (!(msr & UART_MSR_ANY_DELTA))
return msr;
/* update input line counters */
if (msr & UART_MSR_TERI)
port->icount.rng++;
if (msr & UART_MSR_DDSR)
port->icount.dsr++;
if (msr & UART_MSR_DDCD)
port->icount.dcd++;
if (msr & UART_MSR_DCTS)
port->icount.cts++;
wake_up_interruptible(&port->port.delta_msr_wait);
if (tty_port_check_carrier(&port->port) && (msr & UART_MSR_DDCD)) {
if (msr & UART_MSR_DCD)
wake_up_interruptible(&port->port.open_wait);
}
if (tty_port_cts_enabled(&port->port))
mxser_handle_cts(tty, port, msr);
return msr;
}
static void mxser_disable_and_clear_FIFO(struct mxser_port *info)
{
u8 fcr = UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT;
if (info->board->must_hwid)
fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
outb(fcr, info->ioaddr + UART_FCR);
}
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 flags;
int ret;
ret = tty_port_alloc_xmit_buf(port);
if (ret < 0)
return ret;
spin_lock_irqsave(&info->slock, flags);
if (!info->type) {
set_bit(TTY_IO_ERROR, &tty->flags);
spin_unlock_irqrestore(&info->slock, flags);
ret = 0;
goto err_free_xmit;
}
/*
* Clear the FIFO buffers and disable them
* (they will be reenabled in mxser_change_speed())
*/
mxser_disable_and_clear_FIFO(info);
/*
* 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;
}
ret = -ENODEV;
goto err_free_xmit;
}
/*
* 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);
kfifo_reset(&port->xmit_fifo);
/*
* and set the speed of the serial port
*/
mxser_change_speed(tty, NULL);
spin_unlock_irqrestore(&info->slock, flags);
return 0;
err_free_xmit:
tty_port_free_xmit_buf(port);
return ret;
}
/*
* To stop accepting input, we disable the receive line status interrupts, and
* tell the interrupt driver to stop checking the data ready bit in the line
* status register.
*/
static void mxser_stop_rx(struct mxser_port *info)
{
info->IER &= ~UART_IER_RLSI;
if (info->board->must_hwid)
info->IER &= ~MOXA_MUST_RECV_ISR;
outb(info->IER, info->ioaddr + UART_IER);
}
/*
* 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);
mxser_stop_rx(info);
/*
* 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);
info->IER = 0;
outb(0x00, info->ioaddr + UART_IER);
/* clear Rx/Tx FIFO's */
mxser_disable_and_clear_FIFO(info);
/* 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);
/* make sure ISR is not running while we free the buffer */
synchronize_irq(info->board->irq);
tty_port_free_xmit_buf(port);
}
/*
* 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;
unsigned long flags;
spin_lock_irqsave(&info->slock, flags);
kfifo_reset(&info->port.xmit_fifo);
outb(info->FCR | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
info->ioaddr + UART_FCR);
spin_unlock_irqrestore(&info->slock, flags);
tty_wakeup(tty);
}
static void mxser_close(struct tty_struct *tty, struct file *filp)
{
tty_port_close(tty->port, tty, filp);
}
static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
struct mxser_port *info = tty->driver_data;
unsigned long flags;
int written;
bool is_empty;
spin_lock_irqsave(&info->slock, flags);
written = kfifo_in(&info->port.xmit_fifo, buf, count);
is_empty = kfifo_is_empty(&info->port.xmit_fifo);
spin_unlock_irqrestore(&info->slock, flags);
if (!is_empty && !tty->flow.stopped)
if (!tty->hw_stopped || mxser_16550A_or_MUST(info))
mxser_start_tx(info);
return written;
}
static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
{
struct mxser_port *info = tty->driver_data;
unsigned long flags;
int ret;
spin_lock_irqsave(&info->slock, flags);
ret = kfifo_put(&info->port.xmit_fifo, ch);
spin_unlock_irqrestore(&info->slock, flags);
return ret;
}
static void mxser_flush_chars(struct tty_struct *tty)
{
struct mxser_port *info = tty->driver_data;
if (kfifo_is_empty(&info->port.xmit_fifo) || tty->flow.stopped ||
(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;
return kfifo_avail(&info->port.xmit_fifo);
}
static unsigned int mxser_chars_in_buffer(struct tty_struct *tty)
{
struct mxser_port *info = tty->driver_data;
return kfifo_len(&info->port.xmit_fifo);
}
/*
* ------------------------------------------------------------
* 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, NULL);
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;
unsigned long flags;
u8 msr;
if (tty_io_error(tty))
return -EIO;
spin_lock_irqsave(&info->slock, flags);
control = info->MCR;
msr = mxser_check_modem_status(tty, info);
spin_unlock_irqrestore(&info->slock, flags);
return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) |
((msr & UART_MSR_RI) ? TIOCM_RNG : 0) |
((msr & UART_MSR_DSR) ? TIOCM_DSR : 0) |
((msr & 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;
}
/*
* 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)
{
struct mxser_port *info = tty->driver_data;
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);
}
}
static void mxser_unthrottle(struct tty_struct *tty)
{
struct mxser_port *info = tty->driver_data;
/* startrx */
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 (!kfifo_is_empty(&info->port.xmit_fifo))
__mxser_start_tx(info);
spin_unlock_irqrestore(&info->slock, flags);
}
static void mxser_set_termios(struct tty_struct *tty,
const struct ktermios *old_termios)
{
struct mxser_port *info = tty->driver_data;
unsigned long flags;
spin_lock_irqsave(&info->slock, flags);
mxser_change_speed(tty, old_termios);
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);
}
}
static bool mxser_tx_empty(struct mxser_port *info)
{
unsigned long flags;
u8 lsr;
spin_lock_irqsave(&info->slock, flags);
lsr = inb(info->ioaddr + UART_LSR);
spin_unlock_irqrestore(&info->slock, flags);
return !(lsr & UART_LSR_TEMT);
}
/*
* 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 expire, char_time;
if (info->type == PORT_UNKNOWN)
return;
if (info->xmit_fifo_size == 0)
return; /* Just in case.... */
/*
* 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;
char_time = jiffies_to_msecs(char_time);
/*
* 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;
expire = jiffies + timeout;
while (mxser_tx_empty(info)) {
msleep_interruptible(char_time);
if (signal_pending(current))
break;
if (time_after(jiffies, expire))
break;
}
}
/*
* 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 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 | 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;
while (gdl--) {
u8 ch = inb(port->ioaddr + UART_RX);
if (!tty_insert_flip_char(&port->port, ch, 0))
port->icount.buf_overrun++;
}
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 ignored = 0;
int max = 256;
u8 ch;
do {
if (max-- < 0)
break;
ch = inb(port->ioaddr + UART_RX);
if (hwid && (status & UART_LSR_OE))
outb(port->FCR | UART_FCR_CLEAR_RCVR,
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++;
}
}
if (!tty_insert_flip_char(&port->port, ch, flag)) {
port->icount.buf_overrun++;
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 (!mxser_receive_chars_new(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;
if (port->x_char) {
outb(port->x_char, port->ioaddr + UART_TX);
port->x_char = 0;
port->icount.tx++;
return;
}
if (kfifo_is_empty(&port->port.xmit_fifo) || tty->flow.stopped ||
(tty->hw_stopped && !mxser_16550A_or_MUST(port))) {
__mxser_stop_tx(port);
return;
}
count = port->xmit_fifo_size;
do {
unsigned char c;
if (!kfifo_get(&port->port.xmit_fifo, &c))
break;
outb(c, port->ioaddr + UART_TX);
port->icount.tx++;
} while (--count > 0);
if (kfifo_len(&port->port.xmit_fifo) < WAKEUP_CHARS)
tty_wakeup(tty);
if (kfifo_is_empty(&port->port.xmit_fifo))
__mxser_stop_tx(port);
}
static bool mxser_port_isr(struct mxser_port *port)
{
struct tty_struct *tty;
u8 iir, 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) {
status = inb(port->ioaddr + UART_LSR);
outb(port->FCR | 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);
}
mxser_check_modem_status(tty, port);
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;
/* 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 = tty_alloc_driver(MXSER_PORTS, TTY_DRIVER_REAL_RAW |
TTY_DRIVER_DYNAMIC_DEV);
if (IS_ERR(mxvar_sdriver))
return PTR_ERR(mxvar_sdriver);
/* 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;
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:
tty_driver_kref_put(mxvar_sdriver);
return retval;
}
static void __exit mxser_module_exit(void)
{
pci_unregister_driver(&mxser_driver);
tty_unregister_driver(mxvar_sdriver);
tty_driver_kref_put(mxvar_sdriver);
}
module_init(mxser_module_init);
module_exit(mxser_module_exit);
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