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1551780603
linux/drivers/tty/mxser.c
Jiri Slaby 1551780603 mxser: cleanup LSR handling in mxser_receive_chars 
mxser_interrupt is a bit confusing as it passes a pointer to LSR
variable ("status") to mxser_receive_chars. That function can indeed
update the LCR variable. Make this clear by not passing a variable by
reference, instead, return updated status. And change its type
accordingly -- to u8.

Note that the next patches will rework ISR so that even the definition
of status will be u8 soon too.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210618061516.662-13-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-06-18 13:09:59 +02:00

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// 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_GETDATACOUNT (MOXA + 23)
#define MOXA_DIAGNOSE (MOXA + 50)
#define MOXA_CHKPORTENABLE (MOXA + 60)
#define MOXA_HighSpeedOn (MOXA + 61)
#define MOXA_GET_MAJOR (MOXA + 63)
#define MOXA_GETMSTATUS (MOXA + 65)
#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
#define MOXA_SDS_RSTICOUNTER (MOXA + 69)
#define MOXA_ASPP_OQUEUE (MOXA + 70)
#define MOXA_ASPP_MON (MOXA + 73)
#define MOXA_ASPP_LSTATUS (MOXA + 74)
#define MOXA_ASPP_MON_EXT (MOXA + 75)
#define MOXA_SET_BAUD_METHOD (MOXA + 76)
/* --------------------------------------------------- */
#define NPPI_NOTIFY_PARITY 0x01
#define NPPI_NOTIFY_FRAMING 0x02
#define NPPI_NOTIFY_HW_OVERRUN 0x04
#define NPPI_NOTIFY_SW_OVERRUN 0x08
#define NPPI_NOTIFY_BREAK 0x10
#define NPPI_NOTIFY_CTSHOLD 0x01 /* Tx hold by CTS low */
#define NPPI_NOTIFY_DSRHOLD 0x02 /* Tx hold by DSR low */
#define NPPI_NOTIFY_XOFFHOLD 0x08 /* Tx hold by Xoff received */
#define NPPI_NOTIFY_XOFFXENT 0x10 /* Xoff Sent */
/*
* Follow just what Moxa Must chip defines.
*
* When LCR register (offset 0x03) writes the following value, the Must chip
* will enter enchance mode. And write value on EFR (offset 0x02) bit 6,7 to
* change bank.
*/
#define MOXA_MUST_ENTER_ENCHANCE 0xBF
/* when enhance mode enabled, access on 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 */
/* enchance register bank select and enchance mode setting register */
/* when LCR register equals to 0xBF */
#define MOXA_MUST_EFR_REGISTER 0x02
#define MOXA_MUST_EFR_EFRB_ENABLE 0x10 /* enchance mode enable */
/* enchance 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 UART_MCR_AFE 0x20
#define UART_LSR_SPECIAL 0x1E
#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_HIGHBAUD 1
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)
struct mxser_cardinfo {
char *name;
unsigned int nports;
unsigned int flags;
};
static const struct mxser_cardinfo mxser_cards[] = {
/* 0*/ { "C168H/PCI series", 8, },
{ "C104H/PCI series", 4, },
{ "CP-132 series", 2, },
{ "CP-114 series", 4, },
{ "CT-114 series", 4, },
/* 5*/ { "CP-102 series", 2, MXSER_HIGHBAUD },
{ "CP-104U series", 4, },
{ "CP-168U series", 8, },
{ "CP-132U series", 2, },
{ "CP-134U series", 4, },
/*10*/ { "CP-104JU series", 4, },
{ "Moxa UC7000 Serial", 8, }, /* RC7000 */
{ "CP-118U series", 8, },
{ "CP-102UL series", 2, },
{ "CP-102U series", 2, },
/*15*/ { "CP-118EL series", 8, },
{ "CP-168EL series", 8, },
{ "CP-104EL series", 4, },
{ "CB-108 series", 8, },
{ "CB-114 series", 4, },
/*20*/ { "CB-134I series", 4, },
{ "CP-138U series", 8, },
{ "POS-104UL series", 4, },
{ "CP-114UL series", 4, },
{ "CP-102UF series", 2, },
/*25*/ { "CP-112UL series", 2, },
};
/* 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 = 0 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104), .driver_data = 1 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132), .driver_data = 2 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114), .driver_data = 3 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114), .driver_data = 4 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102), .driver_data = 5 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 6 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 7 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 8 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 9 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 10 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 11 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 12 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 13 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 14 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 15 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 16 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 17 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108), .driver_data = 18 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114), .driver_data = 19 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I), .driver_data = 20 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U), .driver_data = 21 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL), .driver_data = 22 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL), .driver_data = 23 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF), .driver_data = 24 },
{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL), .driver_data = 25 },
{ }
};
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_log {
int tick;
unsigned long rxcnt[MXSER_PORTS];
unsigned long txcnt[MXSER_PORTS];
};
struct mxser_mon {
unsigned long rxcnt;
unsigned long txcnt;
unsigned long up_rxcnt;
unsigned long up_txcnt;
int modem_status;
unsigned char hold_reason;
};
struct mxser_mon_ext {
unsigned long rx_cnt[32];
unsigned long tx_cnt[32];
unsigned long up_rxcnt[32];
unsigned long up_txcnt[32];
int modem_status[32];
long baudrate[32];
int databits[32];
int stopbits[32];
int parity[32];
int flowctrl[32];
int fifo[32];
int iftype[32];
};
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 baud_base; /* max. speed */
int type; /* UART type */
int x_char; /* xon/xoff character */
int IER; /* Interrupt Enable Register */
int MCR; /* Modem control register */
unsigned char stop_rx;
unsigned char ldisc_stop_rx;
int custom_divisor;
unsigned char err_shadow;
struct async_icount icount; /* kernel counters for 4 input interrupts */
unsigned int timeout;
int read_status_mask;
int ignore_status_mask;
u8 xmit_fifo_size;
int xmit_head;
int xmit_tail;
int xmit_cnt;
int closing;
struct ktermios normal_termios;
struct mxser_mon mon_data;
spinlock_t slock;
};
struct mxser_board {
unsigned int idx;
int irq;
const struct mxser_cardinfo *info;
unsigned long vector;
unsigned long vector_mask;
enum mxser_must_hwid must_hwid;
speed_t max_baud;
struct mxser_port ports[MXSER_PORTS_PER_BOARD];
};
struct mxser_mstatus {
tcflag_t cflag;
int cts;
int dsr;
int ri;
int dcd;
};
static struct mxser_board mxser_boards[MXSER_BOARDS];
static struct tty_driver *mxvar_sdriver;
static struct mxser_log mxvar_log;
static int mxser_set_baud_method[MXSER_PORTS + 1];
static void mxser_enable_must_enchance_mode(unsigned long baseio)
{
u8 oldlcr;
u8 efr;
oldlcr = inb(baseio + UART_LCR);
outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
efr |= MOXA_MUST_EFR_EFRB_ENABLE;
outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
outb(oldlcr, baseio + UART_LCR);
}
static void mxser_disable_must_enchance_mode(unsigned long baseio)
{
u8 oldlcr;
u8 efr;
oldlcr = inb(baseio + UART_LCR);
outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
outb(oldlcr, baseio + UART_LCR);
}
static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
{
u8 oldlcr;
u8 efr;
oldlcr = inb(baseio + UART_LCR);
outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
efr &= ~MOXA_MUST_EFR_BANK_MASK;
efr |= MOXA_MUST_EFR_BANK0;
outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
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;
u8 efr;
oldlcr = inb(baseio + UART_LCR);
outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
efr &= ~MOXA_MUST_EFR_BANK_MASK;
efr |= MOXA_MUST_EFR_BANK0;
outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
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;
u8 efr;
oldlcr = inb(info->ioaddr + UART_LCR);
outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
efr &= ~MOXA_MUST_EFR_BANK_MASK;
efr |= MOXA_MUST_EFR_BANK1;
outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
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;
u8 efr;
oldlcr = inb(baseio + UART_LCR);
outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
efr &= ~MOXA_MUST_EFR_BANK_MASK;
efr |= MOXA_MUST_EFR_BANK2;
outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
outb(oldlcr, baseio + UART_LCR);
}
static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
{
u8 oldlcr;
u8 efr;
oldlcr = inb(baseio + UART_LCR);
outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
efr &= ~MOXA_MUST_EFR_BANK_MASK;
efr |= MOXA_MUST_EFR_BANK2;
outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
*pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
outb(oldlcr, baseio + UART_LCR);
}
static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
{
u8 oldlcr;
u8 efr;
oldlcr = inb(baseio + UART_LCR);
outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
efr &= ~MOXA_MUST_EFR_SF_MASK;
outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
outb(oldlcr, baseio + UART_LCR);
}
static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
{
u8 oldlcr;
u8 efr;
oldlcr = inb(baseio + UART_LCR);
outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
efr |= MOXA_MUST_EFR_SF_TX1;
outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
outb(oldlcr, baseio + UART_LCR);
}
static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
{
u8 oldlcr;
u8 efr;
oldlcr = inb(baseio + UART_LCR);
outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
outb(oldlcr, baseio + UART_LCR);
}
static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
{
u8 oldlcr;
u8 efr;
oldlcr = inb(baseio + UART_LCR);
outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
efr |= MOXA_MUST_EFR_SF_RX1;
outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
outb(oldlcr, baseio + UART_LCR);
}
static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
{
u8 oldlcr;
u8 efr;
oldlcr = inb(baseio + UART_LCR);
outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
outb(oldlcr, baseio + UART_LCR);
}
static enum mxser_must_hwid mxser_must_get_hwid(unsigned long io)
{
u8 oldmcr, hwid;
int i;
outb(0, io + UART_LCR);
mxser_disable_must_enchance_mode(io);
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;
}
mxser_get_must_hardware_id(io, &hwid);
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 void process_txrx_fifo(struct mxser_port *info)
{
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;
} else
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 unsigned char mxser_get_msr(int baseaddr, int mode, int port)
{
static unsigned char mxser_msr[MXSER_PORTS + 1];
unsigned char status = 0;
status = inb(baseaddr + UART_MSR);
mxser_msr[port] &= 0x0F;
mxser_msr[port] |= status;
status = mxser_msr[port];
if (mode)
mxser_msr[port] = 0;
return status;
}
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;
spin_lock_irqsave(&mp->slock, flags);
if (on)
outb(inb(mp->ioaddr + UART_MCR) |
UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
else
outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
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 (!info->ioaddr)
return -1;
if (newspd > info->board->max_baud)
return -1;
if (newspd == 134) {
quot = 2 * info->baud_base / 269;
tty_encode_baud_rate(tty, 134, 134);
} else if (newspd) {
quot = info->baud_base / newspd;
if (quot == 0)
quot = 1;
baud = info->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, info->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 = info->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;
}
/*
* 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;
unsigned char status;
cflag = tty->termios.c_cflag;
if (!info->ioaddr)
return;
if (mxser_set_baud_method[tty->index] == 0)
mxser_set_baud(tty, tty_get_baud_rate(tty));
/* byte size and parity */
switch (cflag & CSIZE) {
case CS5:
cval = 0x00;
break;
case CS6:
cval = 0x01;
break;
case CS7:
cval = 0x02;
break;
case CS8:
cval = 0x03;
break;
default:
cval = 0x00;
break; /* too keep GCC shut... */
}
if (cflag & CSTOPB)
cval |= 0x04;
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 ((info->type == PORT_16550A) || (info->board->must_hwid)) {
info->MCR |= UART_MCR_AFE;
} else {
status = inb(info->ioaddr + UART_MSR);
if (tty->hw_stopped) {
if (status & UART_MSR_CTS) {
tty->hw_stopped = 0;
if (info->type != PORT_16550A &&
!info->board->must_hwid) {
outb(info->IER & ~UART_IER_THRI,
info->ioaddr +
UART_IER);
info->IER |= UART_IER_THRI;
outb(info->IER, info->ioaddr +
UART_IER);
}
tty_wakeup(tty);
}
} else {
if (!(status & UART_MSR_CTS)) {
tty->hw_stopped = 1;
if ((info->type != PORT_16550A) &&
(!info->board->must_hwid)) {
info->IER &= ~UART_IER_THRI;
outb(info->IER, info->ioaddr +
UART_IER);
}
}
}
}
}
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));
if (I_IXON(tty)) {
mxser_enable_must_rx_software_flow_control(
info->ioaddr);
} else {
mxser_disable_must_rx_software_flow_control(
info->ioaddr);
}
if (I_IXOFF(tty)) {
mxser_enable_must_tx_software_flow_control(
info->ioaddr);
} else {
mxser_disable_must_tx_software_flow_control(
info->ioaddr);
}
}
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++;
port->mon_data.modem_status = status;
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)) {
if (tty->hw_stopped) {
if (status & UART_MSR_CTS) {
tty->hw_stopped = 0;
if ((port->type != PORT_16550A) &&
(!port->board->must_hwid)) {
outb(port->IER & ~UART_IER_THRI,
port->ioaddr + UART_IER);
port->IER |= UART_IER_THRI;
outb(port->IER, port->ioaddr +
UART_IER);
}
tty_wakeup(tty);
}
} else {
if (!(status & UART_MSR_CTS)) {
tty->hw_stopped = 1;
if (port->type != PORT_16550A &&
!port->board->must_hwid) {
port->IER &= ~UART_IER_THRI;
outb(port->IER, port->ioaddr +
UART_IER);
}
}
}
}
}
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->ioaddr || !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)
SET_MOXA_MUST_NO_SOFTWARE_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 mxser_port *info;
int line;
line = tty->index;
if (line == MXSER_PORTS)
return 0;
info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
if (!info->ioaddr)
return -ENODEV;
tty->driver_data = info;
return tty_port_open(&info->port, 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 (tty->index == MXSER_PORTS || 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 ||
(info->type == PORT_16550A) ||
(info->board->must_hwid)) {
spin_lock_irqsave(&info->slock, flags);
outb(info->IER & ~UART_IER_THRI, info->ioaddr +
UART_IER);
info->IER |= UART_IER_THRI;
outb(info->IER, info->ioaddr + UART_IER);
spin_unlock_irqrestore(&info->slock, flags);
}
}
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);
if (!tty->flow.stopped) {
if (!tty->hw_stopped ||
(info->type == PORT_16550A) ||
info->board->must_hwid) {
spin_lock_irqsave(&info->slock, flags);
outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
info->IER |= UART_IER_THRI;
outb(info->IER, info->ioaddr + UART_IER);
spin_unlock_irqrestore(&info->slock, flags);
}
}
return 1;
}
static void mxser_flush_chars(struct tty_struct *tty)
{
struct mxser_port *info = tty->driver_data;
unsigned long flags;
if (info->xmit_cnt <= 0 || tty->flow.stopped || !info->port.xmit_buf ||
(tty->hw_stopped && info->type != PORT_16550A &&
!info->board->must_hwid))
return;
spin_lock_irqsave(&info->slock, flags);
outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
info->IER |= UART_IER_THRI;
outb(info->IER, info->ioaddr + UART_IER);
spin_unlock_irqrestore(&info->slock, flags);
}
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;
if (tty->index == MXSER_PORTS)
return -ENOTTY;
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 = info->baud_base,
ss->close_delay = close_delay;
ss->closing_wait = closing_wait;
ss->custom_divisor = info->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 flags, close_delay, closing_wait;
int retval = 0;
if (tty->index == MXSER_PORTS)
return -ENOTTY;
if (tty_io_error(tty))
return -EIO;
mutex_lock(&port->mutex);
if (!info->ioaddr) {
mutex_unlock(&port->mutex);
return -ENODEV;
}
if (ss->irq != info->board->irq ||
ss->port != info->ioaddr) {
mutex_unlock(&port->mutex);
return -EINVAL;
}
flags = 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 != info->baud_base) ||
(close_delay != info->port.close_delay) ||
(closing_wait != info->port.closing_wait) ||
((ss->flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK))) {
mutex_unlock(&port->mutex);
return -EPERM;
}
info->port.flags = ((info->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 != info->baud_base ||
ss->custom_divisor !=
info->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;
process_txrx_fifo(info);
}
if (tty_port_initialized(port)) {
if (flags != (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->index == MXSER_PORTS)
return -ENOIOCTLCMD;
if (tty_io_error(tty))
return -EIO;
control = info->MCR;
spin_lock_irqsave(&info->slock, flags);
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->index == MXSER_PORTS)
return -ENOIOCTLCMD;
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_ioctl_special(unsigned int cmd, void __user *argp)
{
struct mxser_port *ip;
struct tty_port *port;
struct tty_struct *tty;
int result, status;
unsigned int i, j;
int ret = 0;
switch (cmd) {
case MOXA_GET_MAJOR:
printk_ratelimited(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
"%x (GET_MAJOR), fix your userspace\n",
current->comm, cmd);
return put_user(ttymajor, (int __user *)argp);
case MOXA_CHKPORTENABLE:
result = 0;
for (i = 0; i < MXSER_BOARDS; i++)
for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
if (mxser_boards[i].ports[j].ioaddr)
result |= (1 << i);
return put_user(result, (unsigned long __user *)argp);
case MOXA_GETDATACOUNT:
/* The receive side is locked by port->slock but it isn't
clear that an exact snapshot is worth copying here */
if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
ret = -EFAULT;
return ret;
case MOXA_GETMSTATUS: {
struct mxser_mstatus ms, __user *msu = argp;
for (i = 0; i < MXSER_BOARDS; i++)
for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
ip = &mxser_boards[i].ports[j];
port = &ip->port;
memset(&ms, 0, sizeof(ms));
mutex_lock(&port->mutex);
if (!ip->ioaddr)
goto copy;
tty = tty_port_tty_get(port);
if (!tty)
ms.cflag = ip->normal_termios.c_cflag;
else
ms.cflag = tty->termios.c_cflag;
tty_kref_put(tty);
spin_lock_irq(&ip->slock);
status = inb(ip->ioaddr + UART_MSR);
spin_unlock_irq(&ip->slock);
if (status & UART_MSR_DCD)
ms.dcd = 1;
if (status & UART_MSR_DSR)
ms.dsr = 1;
if (status & UART_MSR_CTS)
ms.cts = 1;
copy:
mutex_unlock(&port->mutex);
if (copy_to_user(msu, &ms, sizeof(ms)))
return -EFAULT;
msu++;
}
return 0;
}
case MOXA_ASPP_MON_EXT: {
struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
unsigned int cflag, iflag, p;
u8 opmode;
me = kzalloc(sizeof(*me), GFP_KERNEL);
if (!me)
return -ENOMEM;
for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
if (p >= ARRAY_SIZE(me->rx_cnt)) {
i = MXSER_BOARDS;
break;
}
ip = &mxser_boards[i].ports[j];
port = &ip->port;
mutex_lock(&port->mutex);
if (!ip->ioaddr) {
mutex_unlock(&port->mutex);
continue;
}
spin_lock_irq(&ip->slock);
status = mxser_get_msr(ip->ioaddr, 0, p);
if (status & UART_MSR_TERI)
ip->icount.rng++;
if (status & UART_MSR_DDSR)
ip->icount.dsr++;
if (status & UART_MSR_DDCD)
ip->icount.dcd++;
if (status & UART_MSR_DCTS)
ip->icount.cts++;
ip->mon_data.modem_status = status;
me->rx_cnt[p] = ip->mon_data.rxcnt;
me->tx_cnt[p] = ip->mon_data.txcnt;
me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
me->up_txcnt[p] = ip->mon_data.up_txcnt;
me->modem_status[p] =
ip->mon_data.modem_status;
spin_unlock_irq(&ip->slock);
tty = tty_port_tty_get(&ip->port);
if (!tty) {
cflag = ip->normal_termios.c_cflag;
iflag = ip->normal_termios.c_iflag;
me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
} else {
cflag = tty->termios.c_cflag;
iflag = tty->termios.c_iflag;
me->baudrate[p] = tty_get_baud_rate(tty);
}
tty_kref_put(tty);
me->databits[p] = cflag & CSIZE;
me->stopbits[p] = cflag & CSTOPB;
me->parity[p] = cflag & (PARENB | PARODD |
CMSPAR);
if (cflag & CRTSCTS)
me->flowctrl[p] |= 0x03;
if (iflag & (IXON | IXOFF))
me->flowctrl[p] |= 0x0C;
if (ip->type == PORT_16550A)
me->fifo[p] = 1;
if (ip->board->must_hwid == MOXA_MUST_MU860_HWID) {
opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
opmode &= OP_MODE_MASK;
} else {
opmode = RS232_MODE;
}
me->iftype[p] = opmode;
mutex_unlock(&port->mutex);
}
}
if (copy_to_user(argp, me, sizeof(*me)))
ret = -EFAULT;
kfree(me);
return ret;
}
default:
return -ENOIOCTLCMD;
}
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;
}
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 (tty->index == MXSER_PORTS)
return mxser_ioctl_special(cmd, argp);
if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
int p;
unsigned long opmode;
static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
int shiftbit;
unsigned char val, mask;
if (info->board->must_hwid != MOXA_MUST_MU860_HWID)
return -EFAULT;
p = tty->index % 4;
if (cmd == MOXA_SET_OP_MODE) {
if (get_user(opmode, (int __user *) argp))
return -EFAULT;
if (opmode != RS232_MODE &&
opmode != RS485_2WIRE_MODE &&
opmode != RS422_MODE &&
opmode != RS485_4WIRE_MODE)
return -EFAULT;
mask = ModeMask[p];
shiftbit = p * 2;
spin_lock_irq(&info->slock);
val = inb(info->opmode_ioaddr);
val &= mask;
val |= (opmode << shiftbit);
outb(val, info->opmode_ioaddr);
spin_unlock_irq(&info->slock);
} else {
shiftbit = p * 2;
spin_lock_irq(&info->slock);
opmode = inb(info->opmode_ioaddr) >> shiftbit;
spin_unlock_irq(&info->slock);
opmode &= OP_MODE_MASK;
if (put_user(opmode, (int __user *)argp))
return -EFAULT;
}
return 0;
}
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));
case MOXA_HighSpeedOn:
return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
case MOXA_SDS_RSTICOUNTER:
spin_lock_irq(&info->slock);
info->mon_data.rxcnt = 0;
info->mon_data.txcnt = 0;
spin_unlock_irq(&info->slock);
return 0;
case MOXA_ASPP_OQUEUE:{
int len, lsr;
len = mxser_chars_in_buffer(tty);
spin_lock_irq(&info->slock);
lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
spin_unlock_irq(&info->slock);
len += (lsr ? 0 : 1);
return put_user(len, (int __user *)argp);
}
case MOXA_ASPP_MON: {
int mcr, status;
spin_lock_irq(&info->slock);
status = mxser_get_msr(info->ioaddr, 1, tty->index);
mxser_check_modem_status(tty, info, status);
mcr = inb(info->ioaddr + UART_MCR);
spin_unlock_irq(&info->slock);
if (mcr & MOXA_MUST_MCR_XON_FLAG)
info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
else
info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
if (mcr & MOXA_MUST_MCR_TX_XON)
info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
else
info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
if (tty->hw_stopped)
info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
else
info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
if (copy_to_user(argp, &info->mon_data,
sizeof(struct mxser_mon)))
return -EFAULT;
return 0;
}
case MOXA_ASPP_LSTATUS: {
if (put_user(info->err_shadow, (unsigned char __user *)argp))
return -EFAULT;
info->err_shadow = 0;
return 0;
}
case MOXA_SET_BAUD_METHOD: {
int method;
if (get_user(method, (int __user *)argp))
return -EFAULT;
mxser_set_baud_method[tty->index] = method;
return put_user(method, (int __user *)argp);
}
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) {
info->IER &= ~UART_IER_THRI;
outb(info->IER, info->ioaddr + UART_IER);
}
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) {
outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
info->IER |= UART_IER_THRI;
outb(info->IER, info->ioaddr + UART_IER);
}
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_disable_must_rx_software_flow_control(
info->ioaddr);
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;
spin_lock_irqsave(&info->slock, flags);
if (break_state == -1)
outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
info->ioaddr + UART_LCR);
else
outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
info->ioaddr + UART_LCR);
spin_unlock_irqrestore(&info->slock, flags);
return 0;
}
static u8 mxser_receive_chars(struct tty_struct *tty,
struct mxser_port *port, u8 status)
{
unsigned char ch, gdl;
int ignored = 0;
int cnt = 0;
int recv_room;
int max = 256;
recv_room = tty->receive_room;
if (recv_room == 0 && !port->ldisc_stop_rx)
mxser_stoprx(tty);
if (port->board->must_hwid != MOXA_OTHER_UART) {
if (status & UART_LSR_SPECIAL)
goto intr_old;
if (port->board->must_hwid == MOXA_MUST_MU860_HWID &&
(status & MOXA_MUST_LSR_RERR))
goto intr_old;
if (status & MOXA_MUST_LSR_RERR)
goto intr_old;
gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
if (port->board->must_hwid == MOXA_MUST_MU150_HWID)
gdl &= MOXA_MUST_GDL_MASK;
if (gdl >= recv_room) {
if (!port->ldisc_stop_rx)
mxser_stoprx(tty);
}
while (gdl--) {
ch = inb(port->ioaddr + UART_RX);
tty_insert_flip_char(&port->port, ch, 0);
cnt++;
}
goto end_intr;
}
intr_old:
do {
if (max-- < 0)
break;
ch = inb(port->ioaddr + UART_RX);
if (port->board->must_hwid && (status & UART_LSR_OE))
outb(0x23, 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_SPECIAL) {
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++;
} else
flag = TTY_BREAK;
}
tty_insert_flip_char(&port->port, ch, flag);
cnt++;
if (cnt >= recv_room) {
if (!port->ldisc_stop_rx)
mxser_stoprx(tty);
break;
}
}
if (port->board->must_hwid)
break;
status = inb(port->ioaddr + UART_LSR);
} while (status & UART_LSR_DR);
end_intr:
mxvar_log.rxcnt[tty->index] += cnt;
port->mon_data.rxcnt += cnt;
port->mon_data.up_rxcnt += cnt;
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;
mxvar_log.txcnt[tty->index]++;
port->mon_data.txcnt++;
port->mon_data.up_txcnt++;
port->icount.tx++;
return;
}
if (port->port.xmit_buf == NULL)
return;
if (port->xmit_cnt <= 0 || tty->flow.stopped ||
(tty->hw_stopped &&
(port->type != PORT_16550A) &&
(!port->board->must_hwid))) {
port->IER &= ~UART_IER_THRI;
outb(port->IER, port->ioaddr + UART_IER);
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 <= 0)
break;
} while (--count > 0);
mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
port->mon_data.txcnt += (cnt - port->xmit_cnt);
port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
port->icount.tx += (cnt - port->xmit_cnt);
if (port->xmit_cnt < WAKEUP_CHARS)
tty_wakeup(tty);
if (port->xmit_cnt <= 0) {
port->IER &= ~UART_IER_THRI;
outb(port->IER, port->ioaddr + UART_IER);
}
}
/*
* This is the serial driver's generic interrupt routine
*/
static irqreturn_t mxser_interrupt(int irq, void *dev_id)
{
int status, iir, i;
struct mxser_board *brd = dev_id;
struct mxser_port *port;
int max, irqbits, bits, msr;
unsigned int int_cnt, pass_counter = 0;
int handled = IRQ_NONE;
struct tty_struct *tty;
max = brd->info->nports;
while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
irqbits = inb(brd->vector) & brd->vector_mask;
if (irqbits == brd->vector_mask)
break;
handled = IRQ_HANDLED;
for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
if (irqbits == brd->vector_mask)
break;
if (bits & irqbits)
continue;
port = &brd->ports[i];
int_cnt = 0;
spin_lock(&port->slock);
do {
iir = inb(port->ioaddr + UART_IIR);
if (iir & UART_IIR_NO_INT)
break;
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(0x27, port->ioaddr + UART_FCR);
inb(port->ioaddr + UART_MSR);
tty_kref_put(tty);
break;
}
status = inb(port->ioaddr + UART_LSR);
if (status & UART_LSR_PE)
port->err_shadow |= NPPI_NOTIFY_PARITY;
if (status & UART_LSR_FE)
port->err_shadow |= NPPI_NOTIFY_FRAMING;
if (status & UART_LSR_OE)
port->err_shadow |=
NPPI_NOTIFY_HW_OVERRUN;
if (status & UART_LSR_BI)
port->err_shadow |= NPPI_NOTIFY_BREAK;
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);
}
tty_kref_put(tty);
} 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 int mxser_initbrd(struct mxser_board *brd)
{
struct mxser_port *info;
unsigned int i;
int retval;
for (i = 0; i < brd->info->nports; i++) {
info = &brd->ports[i];
tty_port_init(&info->port);
info->port.ops = &mxser_port_ops;
info->board = brd;
info->stop_rx = 0;
info->ldisc_stop_rx = 0;
/* Enhance mode enabled here */
if (brd->must_hwid != MOXA_OTHER_UART)
mxser_enable_must_enchance_mode(info->ioaddr);
info->type = PORT_16550A;
process_txrx_fifo(info);
info->custom_divisor = info->baud_base * 16;
info->port.close_delay = 5 * HZ / 10;
info->port.closing_wait = 30 * HZ;
info->normal_termios = mxvar_sdriver->init_termios;
memset(&info->mon_data, 0, sizeof(struct mxser_mon));
info->err_shadow = 0;
spin_lock_init(&info->slock);
/* before set INT ISR, disable all int */
outb(inb(info->ioaddr + UART_IER) & 0xf0,
info->ioaddr + UART_IER);
}
retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
brd);
if (retval) {
for (i = 0; i < brd->info->nports; i++)
tty_port_destroy(&brd->ports[i].port);
printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
"conflict with another device.\n",
brd->info->name, brd->irq);
}
return retval;
}
static void mxser_board_remove(struct mxser_board *brd)
{
unsigned int i;
for (i = 0; i < brd->info->nports; i++) {
tty_unregister_device(mxvar_sdriver, brd->idx + i);
tty_port_destroy(&brd->ports[i].port);
}
free_irq(brd->irq, brd);
}
static int mxser_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct mxser_board *brd;
unsigned int i, j;
unsigned long ioaddress;
struct device *tty_dev;
int retval = -EINVAL;
for (i = 0; i < MXSER_BOARDS; i++)
if (mxser_boards[i].info == NULL)
break;
if (i >= MXSER_BOARDS) {
dev_err(&pdev->dev, "too many boards found (maximum %d), board "
"not configured\n", MXSER_BOARDS);
goto err;
}
brd = &mxser_boards[i];
brd->idx = i * MXSER_PORTS_PER_BOARD;
dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
mxser_cards[ent->driver_data].name,
pdev->bus->number, PCI_SLOT(pdev->devfn));
retval = pci_enable_device(pdev);
if (retval) {
dev_err(&pdev->dev, "PCI enable failed\n");
goto err;
}
/* io address */
ioaddress = pci_resource_start(pdev, 2);
retval = pci_request_region(pdev, 2, "mxser(IO)");
if (retval)
goto err_dis;
brd->info = &mxser_cards[ent->driver_data];
for (i = 0; i < brd->info->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;
brd->must_hwid = mxser_must_get_hwid(brd->ports[0].ioaddr);
brd->vector_mask = 0;
for (j = 0; j < UART_INFO_NUM; j++) {
if (Gpci_uart_info[j].type == brd->must_hwid) {
brd->max_baud = Gpci_uart_info[j].max_baud;
/* exception....CP-102 */
if (brd->info->flags & MXSER_HIGHBAUD)
brd->max_baud = 921600;
break;
}
}
if (brd->must_hwid == MOXA_MUST_MU860_HWID) {
for (i = 0; i < brd->info->nports; i++) {
if (i < 4)
brd->ports[i].opmode_ioaddr = ioaddress + 4;
else
brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
}
outb(0, ioaddress + 4); /* default set to RS232 mode */
outb(0, ioaddress + 0x0c); /* default set to RS232 mode */
}
for (i = 0; i < brd->info->nports; i++) {
brd->vector_mask |= (1 << i);
brd->ports[i].baud_base = 921600;
}
/* mxser_initbrd will hook ISR. */
retval = mxser_initbrd(brd);
if (retval)
goto err_rel3;
for (i = 0; i < brd->info->nports; i++) {
tty_dev = tty_port_register_device(&brd->ports[i].port,
mxvar_sdriver, brd->idx + i, &pdev->dev);
if (IS_ERR(tty_dev)) {
retval = PTR_ERR(tty_dev);
for (; i > 0; i--)
tty_unregister_device(mxvar_sdriver,
brd->idx + i - 1);
goto err_relbrd;
}
}
pci_set_drvdata(pdev, brd);
return 0;
err_relbrd:
for (i = 0; i < brd->info->nports; i++)
tty_port_destroy(&brd->ports[i].port);
free_irq(brd->irq, brd);
err_rel3:
pci_release_region(pdev, 3);
err_zero:
brd->info = NULL;
pci_release_region(pdev, 2);
err_dis:
pci_disable_device(pdev);
err:
return retval;
}
static void mxser_remove(struct pci_dev *pdev)
{
struct mxser_board *brd = pci_get_drvdata(pdev);
mxser_board_remove(brd);
pci_release_region(pdev, 2);
pci_release_region(pdev, 3);
pci_disable_device(pdev);
brd->info = NULL;
}
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 + 1);
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);
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