/* * mxser.c -- MOXA Smartio/Industio family multiport serial driver. * * Copyright (C) 1999-2001 Moxa Technologies (support@moxa.com.tw). * * This code is loosely based on the Linux serial driver, written by * Linus Torvalds, Theodore T'so and others. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Original release 10/26/00 * * 02/06/01 Support MOXA Industio family boards. * 02/06/01 Support TIOCGICOUNT. * 02/06/01 Fix the problem for connecting to serial mouse. * 02/06/01 Fix the problem for H/W flow control. * 02/06/01 Fix the compling warning when CONFIG_PCI * don't be defined. * * Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox * . The original 1.8 code is available on www.moxa.com. * - Fixed x86_64 cleanness * - Fixed sleep with spinlock held in mxser_send_break */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "mxser.h" #define MXSER_VERSION "1.8" #define MXSERMAJOR 174 #define MXSERCUMAJOR 175 #define MXSER_EVENT_TXLOW 1 #define MXSER_EVENT_HANGUP 2 #define MXSER_BOARDS 4 /* Max. boards */ #define MXSER_PORTS 32 /* Max. ports */ #define MXSER_PORTS_PER_BOARD 8 /* Max. ports per board */ #define MXSER_ISR_PASS_LIMIT 256 #define MXSER_ERR_IOADDR -1 #define MXSER_ERR_IRQ -2 #define MXSER_ERR_IRQ_CONFLIT -3 #define MXSER_ERR_VECTOR -4 #define SERIAL_TYPE_NORMAL 1 #define SERIAL_TYPE_CALLOUT 2 #define WAKEUP_CHARS 256 #define UART_MCR_AFE 0x20 #define UART_LSR_SPECIAL 0x1E #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|IXON|IXOFF)) #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT) #define C168_ASIC_ID 1 #define C104_ASIC_ID 2 #define C102_ASIC_ID 0xB #define CI132_ASIC_ID 4 #define CI134_ASIC_ID 3 #define CI104J_ASIC_ID 5 enum { MXSER_BOARD_C168_ISA = 1, MXSER_BOARD_C104_ISA, MXSER_BOARD_CI104J, MXSER_BOARD_C168_PCI, MXSER_BOARD_C104_PCI, MXSER_BOARD_C102_ISA, MXSER_BOARD_CI132, MXSER_BOARD_CI134, MXSER_BOARD_CP132, MXSER_BOARD_CP114, MXSER_BOARD_CT114, MXSER_BOARD_CP102, MXSER_BOARD_CP104U, MXSER_BOARD_CP168U, MXSER_BOARD_CP132U, MXSER_BOARD_CP134U, MXSER_BOARD_CP104JU, MXSER_BOARD_RC7000, MXSER_BOARD_CP118U, MXSER_BOARD_CP102UL, MXSER_BOARD_CP102U, }; static char *mxser_brdname[] = { "C168 series", "C104 series", "CI-104J series", "C168H/PCI series", "C104H/PCI series", "C102 series", "CI-132 series", "CI-134 series", "CP-132 series", "CP-114 series", "CT-114 series", "CP-102 series", "CP-104U series", "CP-168U series", "CP-132U series", "CP-134U series", "CP-104JU series", "Moxa UC7000 Serial", "CP-118U series", "CP-102UL series", "CP-102U series", }; static int mxser_numports[] = { 8, // C168-ISA 4, // C104-ISA 4, // CI104J 8, // C168-PCI 4, // C104-PCI 2, // C102-ISA 2, // CI132 4, // CI134 2, // CP132 4, // CP114 4, // CT114 2, // CP102 4, // CP104U 8, // CP168U 2, // CP132U 4, // CP134U 4, // CP104JU 8, // RC7000 8, // CP118U 2, // CP102UL 2, // CP102U }; #define UART_TYPE_NUM 2 static const unsigned int Gmoxa_uart_id[UART_TYPE_NUM] = { MOXA_MUST_MU150_HWID, MOXA_MUST_MU860_HWID }; // This is only for PCI #define UART_INFO_NUM 3 struct mxpciuart_info { int type; int tx_fifo; int rx_fifo; int xmit_fifo_size; int rx_high_water; int rx_trigger; int rx_low_water; long max_baud; }; static const struct mxpciuart_info Gpci_uart_info[UART_INFO_NUM] = { {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L}, {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L}, {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L} }; #ifdef CONFIG_PCI static struct pci_device_id mxser_pcibrds[] = { {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C168, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_C168_PCI}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C104, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_C104_PCI}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP132}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP114, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP114}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CT114, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CT114}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP102}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP104U}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP168U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP168U}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP132U}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP134U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP134U}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104JU, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP104JU}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_RC7000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_RC7000}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP118U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP118U}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102UL, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP102UL}, {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP102U}, {0} }; MODULE_DEVICE_TABLE(pci, mxser_pcibrds); #endif typedef struct _moxa_pci_info { unsigned short busNum; unsigned short devNum; struct pci_dev *pdev; // add by Victor Yu. 06-23-2003 } moxa_pci_info; static int ioaddr[MXSER_BOARDS] = { 0, 0, 0, 0 }; static int ttymajor = MXSERMAJOR; static int calloutmajor = MXSERCUMAJOR; static int verbose = 0; /* Variables for insmod */ MODULE_AUTHOR("Casper Yang"); MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver"); module_param_array(ioaddr, int, NULL, 0); module_param(ttymajor, int, 0); module_param(calloutmajor, int, 0); module_param(verbose, bool, 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_hwconf { int board_type; int ports; int irq; int vector; int vector_mask; int uart_type; int ioaddr[MXSER_PORTS_PER_BOARD]; int baud_base[MXSER_PORTS_PER_BOARD]; moxa_pci_info pciInfo; int IsMoxaMustChipFlag; // add by Victor Yu. 08-30-2002 int MaxCanSetBaudRate[MXSER_PORTS_PER_BOARD]; // add by Victor Yu. 09-04-2002 int opmode_ioaddr[MXSER_PORTS_PER_BOARD]; // add by Victor Yu. 01-05-2004 }; struct mxser_struct { int port; int base; /* port base address */ int irq; /* port using irq no. */ int vector; /* port irq vector */ int vectormask; /* port vector mask */ int rx_high_water; int rx_trigger; /* Rx fifo trigger level */ int rx_low_water; int baud_base; /* max. speed */ int flags; /* defined in tty.h */ int type; /* UART type */ struct tty_struct *tty; int read_status_mask; int ignore_status_mask; int xmit_fifo_size; int custom_divisor; int x_char; /* xon/xoff character */ int close_delay; unsigned short closing_wait; int IER; /* Interrupt Enable Register */ int MCR; /* Modem control register */ unsigned long event; int count; /* # of fd on device */ int blocked_open; /* # of blocked opens */ long session; /* Session of opening process */ long pgrp; /* pgrp of opening process */ unsigned char *xmit_buf; int xmit_head; int xmit_tail; int xmit_cnt; struct work_struct tqueue; struct termios normal_termios; struct termios callout_termios; wait_queue_head_t open_wait; wait_queue_head_t close_wait; wait_queue_head_t delta_msr_wait; struct async_icount icount; /* kernel counters for the 4 input interrupts */ int timeout; int IsMoxaMustChipFlag; // add by Victor Yu. 08-30-2002 int MaxCanSetBaudRate; // add by Victor Yu. 09-04-2002 int opmode_ioaddr; // add by Victor Yu. 01-05-2004 unsigned char stop_rx; unsigned char ldisc_stop_rx; long realbaud; struct mxser_mon mon_data; unsigned char err_shadow; spinlock_t slock; }; struct mxser_mstatus { tcflag_t cflag; int cts; int dsr; int ri; int dcd; }; static struct mxser_mstatus GMStatus[MXSER_PORTS]; static int mxserBoardCAP[MXSER_BOARDS] = { 0, 0, 0, 0 /* 0x180, 0x280, 0x200, 0x320 */ }; static struct tty_driver *mxvar_sdriver; static struct mxser_struct mxvar_table[MXSER_PORTS]; static struct tty_struct *mxvar_tty[MXSER_PORTS + 1]; static struct termios *mxvar_termios[MXSER_PORTS + 1]; static struct termios *mxvar_termios_locked[MXSER_PORTS + 1]; static struct mxser_log mxvar_log; static int mxvar_diagflag; static unsigned char mxser_msr[MXSER_PORTS + 1]; static struct mxser_mon_ext mon_data_ext; static int mxser_set_baud_method[MXSER_PORTS + 1]; static spinlock_t gm_lock; /* * This is used to figure out the divisor speeds and the timeouts */ static struct mxser_hwconf mxsercfg[MXSER_BOARDS]; /* * static functions: */ static void mxser_getcfg(int board, struct mxser_hwconf *hwconf); static int mxser_init(void); //static void mxser_poll(unsigned long); static int mxser_get_ISA_conf(int, struct mxser_hwconf *); static int mxser_get_PCI_conf(int, int, int, struct mxser_hwconf *); static void mxser_do_softint(void *); static int mxser_open(struct tty_struct *, struct file *); static void mxser_close(struct tty_struct *, struct file *); static int mxser_write(struct tty_struct *, const unsigned char *, int); static int mxser_write_room(struct tty_struct *); static void mxser_flush_buffer(struct tty_struct *); static int mxser_chars_in_buffer(struct tty_struct *); static void mxser_flush_chars(struct tty_struct *); static void mxser_put_char(struct tty_struct *, unsigned char); static int mxser_ioctl(struct tty_struct *, struct file *, uint, ulong); static int mxser_ioctl_special(unsigned int, void __user *); static void mxser_throttle(struct tty_struct *); static void mxser_unthrottle(struct tty_struct *); static void mxser_set_termios(struct tty_struct *, struct termios *); static void mxser_stop(struct tty_struct *); static void mxser_start(struct tty_struct *); static void mxser_hangup(struct tty_struct *); static void mxser_rs_break(struct tty_struct *, int); static irqreturn_t mxser_interrupt(int, void *, struct pt_regs *); static void mxser_receive_chars(struct mxser_struct *, int *); static void mxser_transmit_chars(struct mxser_struct *); static void mxser_check_modem_status(struct mxser_struct *, int); static int mxser_block_til_ready(struct tty_struct *, struct file *, struct mxser_struct *); static int mxser_startup(struct mxser_struct *); static void mxser_shutdown(struct mxser_struct *); static int mxser_change_speed(struct mxser_struct *, struct termios *old_termios); static int mxser_get_serial_info(struct mxser_struct *, struct serial_struct __user *); static int mxser_set_serial_info(struct mxser_struct *, struct serial_struct __user *); static int mxser_get_lsr_info(struct mxser_struct *, unsigned int __user *); static void mxser_send_break(struct mxser_struct *, int); static int mxser_tiocmget(struct tty_struct *, struct file *); static int mxser_tiocmset(struct tty_struct *, struct file *, unsigned int, unsigned int); static int mxser_set_baud(struct mxser_struct *info, long newspd); static void mxser_wait_until_sent(struct tty_struct *tty, int timeout); static void mxser_startrx(struct tty_struct *tty); static void mxser_stoprx(struct tty_struct *tty); static int CheckIsMoxaMust(int io) { u8 oldmcr, hwid; int i; outb(0, io + UART_LCR); DISABLE_MOXA_MUST_ENCHANCE_MODE(io); oldmcr = inb(io + UART_MCR); outb(0, io + UART_MCR); SET_MOXA_MUST_XON1_VALUE(io, 0x11); if ((hwid = inb(io + UART_MCR)) != 0) { outb(oldmcr, io + UART_MCR); return (MOXA_OTHER_UART); } GET_MOXA_MUST_HARDWARE_ID(io, &hwid); for (i = 0; i < UART_TYPE_NUM; i++) { if (hwid == Gmoxa_uart_id[i]) return (int) hwid; } return MOXA_OTHER_UART; } // above is modified by Victor Yu. 08-15-2002 static 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, }; /* * The MOXA Smartio/Industio serial driver boot-time initialization code! */ static int __init mxser_module_init(void) { int ret; if (verbose) printk(KERN_DEBUG "Loading module mxser ...\n"); ret = mxser_init(); if (verbose) printk(KERN_DEBUG "Done.\n"); return ret; } static void __exit mxser_module_exit(void) { int i, err; if (verbose) printk(KERN_DEBUG "Unloading module mxser ...\n"); err = tty_unregister_driver(mxvar_sdriver); if (!err) put_tty_driver(mxvar_sdriver); else printk(KERN_ERR "Couldn't unregister MOXA Smartio/Industio family serial driver\n"); for (i = 0; i < MXSER_BOARDS; i++) { struct pci_dev *pdev; if (mxsercfg[i].board_type == -1) continue; else { pdev = mxsercfg[i].pciInfo.pdev; free_irq(mxsercfg[i].irq, &mxvar_table[i * MXSER_PORTS_PER_BOARD]); if (pdev != NULL) { //PCI release_region(pci_resource_start(pdev, 2), pci_resource_len(pdev, 2)); release_region(pci_resource_start(pdev, 3), pci_resource_len(pdev, 3)); } else { release_region(mxsercfg[i].ioaddr[0], 8 * mxsercfg[i].ports); release_region(mxsercfg[i].vector, 1); } } } if (verbose) printk(KERN_DEBUG "Done.\n"); } static void process_txrx_fifo(struct mxser_struct *info) { int i; if ((info->type == PORT_16450) || (info->type == PORT_8250)) { info->rx_trigger = 1; 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->IsMoxaMustChipFlag == Gpci_uart_info[i].type) { info->rx_trigger = Gpci_uart_info[i].rx_trigger; 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].xmit_fifo_size; break; } } } } static int mxser_initbrd(int board, struct mxser_hwconf *hwconf) { struct mxser_struct *info; int retval; int i, n; n = board * MXSER_PORTS_PER_BOARD; info = &mxvar_table[n]; /*if (verbose) */ { printk(KERN_DEBUG " ttyM%d - ttyM%d ", n, n + hwconf->ports - 1); printk(" max. baud rate = %d bps.\n", hwconf->MaxCanSetBaudRate[0]); } for (i = 0; i < hwconf->ports; i++, n++, info++) { info->port = n; info->base = hwconf->ioaddr[i]; info->irq = hwconf->irq; info->vector = hwconf->vector; info->vectormask = hwconf->vector_mask; info->opmode_ioaddr = hwconf->opmode_ioaddr[i]; // add by Victor Yu. 01-05-2004 info->stop_rx = 0; info->ldisc_stop_rx = 0; info->IsMoxaMustChipFlag = hwconf->IsMoxaMustChipFlag; //Enhance mode enabled here if (info->IsMoxaMustChipFlag != MOXA_OTHER_UART) { ENABLE_MOXA_MUST_ENCHANCE_MODE(info->base); } info->flags = ASYNC_SHARE_IRQ; info->type = hwconf->uart_type; info->baud_base = hwconf->baud_base[i]; info->MaxCanSetBaudRate = hwconf->MaxCanSetBaudRate[i]; process_txrx_fifo(info); info->custom_divisor = hwconf->baud_base[i] * 16; info->close_delay = 5 * HZ / 10; info->closing_wait = 30 * HZ; INIT_WORK(&info->tqueue, mxser_do_softint, info); info->normal_termios = mxvar_sdriver->init_termios; init_waitqueue_head(&info->open_wait); init_waitqueue_head(&info->close_wait); init_waitqueue_head(&info->delta_msr_wait); memset(&info->mon_data, 0, sizeof(struct mxser_mon)); info->err_shadow = 0; spin_lock_init(&info->slock); } /* * Allocate the IRQ if necessary */ /* before set INT ISR, disable all int */ for (i = 0; i < hwconf->ports; i++) { outb(inb(hwconf->ioaddr[i] + UART_IER) & 0xf0, hwconf->ioaddr[i] + UART_IER); } n = board * MXSER_PORTS_PER_BOARD; info = &mxvar_table[n]; retval = request_irq(hwconf->irq, mxser_interrupt, IRQ_T(info), "mxser", info); if (retval) { printk(KERN_ERR "Board %d: %s", board, mxser_brdname[hwconf->board_type - 1]); printk(" Request irq fail,IRQ (%d) may be conflit with another device.\n", info->irq); return retval; } return 0; } static void mxser_getcfg(int board, struct mxser_hwconf *hwconf) { mxsercfg[board] = *hwconf; } #ifdef CONFIG_PCI static int mxser_get_PCI_conf(int busnum, int devnum, int board_type, struct mxser_hwconf *hwconf) { int i, j; // unsigned int val; unsigned int ioaddress; struct pci_dev *pdev = hwconf->pciInfo.pdev; //io address hwconf->board_type = board_type; hwconf->ports = mxser_numports[board_type - 1]; ioaddress = pci_resource_start(pdev, 2); request_region(pci_resource_start(pdev, 2), pci_resource_len(pdev, 2), "mxser(IO)"); for (i = 0; i < hwconf->ports; i++) { hwconf->ioaddr[i] = ioaddress + 8 * i; } //vector ioaddress = pci_resource_start(pdev, 3); request_region(pci_resource_start(pdev, 3), pci_resource_len(pdev, 3), "mxser(vector)"); hwconf->vector = ioaddress; //irq hwconf->irq = hwconf->pciInfo.pdev->irq; hwconf->IsMoxaMustChipFlag = CheckIsMoxaMust(hwconf->ioaddr[0]); hwconf->uart_type = PORT_16550A; hwconf->vector_mask = 0; for (i = 0; i < hwconf->ports; i++) { for (j = 0; j < UART_INFO_NUM; j++) { if (Gpci_uart_info[j].type == hwconf->IsMoxaMustChipFlag) { hwconf->MaxCanSetBaudRate[i] = Gpci_uart_info[j].max_baud; //exception....CP-102 if (board_type == MXSER_BOARD_CP102) hwconf->MaxCanSetBaudRate[i] = 921600; break; } } } if (hwconf->IsMoxaMustChipFlag == MOXA_MUST_MU860_HWID) { for (i = 0; i < hwconf->ports; i++) { if (i < 4) hwconf->opmode_ioaddr[i] = ioaddress + 4; else hwconf->opmode_ioaddr[i] = ioaddress + 0x0c; } outb(0, ioaddress + 4); // default set to RS232 mode outb(0, ioaddress + 0x0c); //default set to RS232 mode } for (i = 0; i < hwconf->ports; i++) { hwconf->vector_mask |= (1 << i); hwconf->baud_base[i] = 921600; } return (0); } #endif static int mxser_init(void) { int i, m, retval, b, n; struct pci_dev *pdev = NULL; int index; unsigned char busnum, devnum; struct mxser_hwconf hwconf; mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1); if (!mxvar_sdriver) return -ENOMEM; spin_lock_init(&gm_lock); for (i = 0; i < MXSER_BOARDS; i++) { mxsercfg[i].board_type = -1; } printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n", MXSER_VERSION); /* Initialize the tty_driver structure */ memset(mxvar_sdriver, 0, sizeof(struct tty_driver)); mxvar_sdriver->magic = TTY_DRIVER_MAGIC; mxvar_sdriver->name = "ttyM"; mxvar_sdriver->major = ttymajor; mxvar_sdriver->minor_start = 0; mxvar_sdriver->num = MXSER_PORTS + 1; 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_set_operations(mxvar_sdriver, &mxser_ops); mxvar_sdriver->ttys = mxvar_tty; mxvar_sdriver->termios = mxvar_termios; mxvar_sdriver->termios_locked = mxvar_termios_locked; mxvar_diagflag = 0; memset(mxvar_table, 0, MXSER_PORTS * sizeof(struct mxser_struct)); memset(&mxvar_log, 0, sizeof(struct mxser_log)); memset(&mxser_msr, 0, sizeof(unsigned char) * (MXSER_PORTS + 1)); memset(&mon_data_ext, 0, sizeof(struct mxser_mon_ext)); memset(&mxser_set_baud_method, 0, sizeof(int) * (MXSER_PORTS + 1)); memset(&hwconf, 0, sizeof(struct mxser_hwconf)); m = 0; /* Start finding ISA boards here */ for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) { int cap; if (!(cap = mxserBoardCAP[b])) continue; retval = mxser_get_ISA_conf(cap, &hwconf); if (retval != 0) printk(KERN_INFO "Found MOXA %s board (CAP=0x%x)\n", mxser_brdname[hwconf.board_type - 1], ioaddr[b]); if (retval <= 0) { if (retval == MXSER_ERR_IRQ) printk(KERN_ERR "Invalid interrupt number,board not configured\n"); else if (retval == MXSER_ERR_IRQ_CONFLIT) printk(KERN_ERR "Invalid interrupt number,board not configured\n"); else if (retval == MXSER_ERR_VECTOR) printk(KERN_ERR "Invalid interrupt vector,board not configured\n"); else if (retval == MXSER_ERR_IOADDR) printk(KERN_ERR "Invalid I/O address,board not configured\n"); continue; } hwconf.pciInfo.busNum = 0; hwconf.pciInfo.devNum = 0; hwconf.pciInfo.pdev = NULL; mxser_getcfg(m, &hwconf); //init mxsercfg first, or mxsercfg data is not correct on ISR. //mxser_initbrd will hook ISR. if (mxser_initbrd(m, &hwconf) < 0) continue; m++; } /* Start finding ISA boards from module arg */ for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) { int cap; if (!(cap = ioaddr[b])) continue; retval = mxser_get_ISA_conf(cap, &hwconf); if (retval != 0) printk(KERN_INFO "Found MOXA %s board (CAP=0x%x)\n", mxser_brdname[hwconf.board_type - 1], ioaddr[b]); if (retval <= 0) { if (retval == MXSER_ERR_IRQ) printk(KERN_ERR "Invalid interrupt number,board not configured\n"); else if (retval == MXSER_ERR_IRQ_CONFLIT) printk(KERN_ERR "Invalid interrupt number,board not configured\n"); else if (retval == MXSER_ERR_VECTOR) printk(KERN_ERR "Invalid interrupt vector,board not configured\n"); else if (retval == MXSER_ERR_IOADDR) printk(KERN_ERR "Invalid I/O address,board not configured\n"); continue; } hwconf.pciInfo.busNum = 0; hwconf.pciInfo.devNum = 0; hwconf.pciInfo.pdev = NULL; mxser_getcfg(m, &hwconf); //init mxsercfg first, or mxsercfg data is not correct on ISR. //mxser_initbrd will hook ISR. if (mxser_initbrd(m, &hwconf) < 0) continue; m++; } /* start finding PCI board here */ #ifdef CONFIG_PCI n = ARRAY_SIZE(mxser_pcibrds) - 1; index = 0; b = 0; while (b < n) { pdev = pci_find_device(mxser_pcibrds[b].vendor, mxser_pcibrds[b].device, pdev); if (pdev == NULL) { b++; continue; } hwconf.pciInfo.busNum = busnum = pdev->bus->number; hwconf.pciInfo.devNum = devnum = PCI_SLOT(pdev->devfn) << 3; hwconf.pciInfo.pdev = pdev; printk(KERN_INFO "Found MOXA %s board(BusNo=%d,DevNo=%d)\n", mxser_brdname[(int) (mxser_pcibrds[b].driver_data) - 1], busnum, devnum >> 3); index++; if (m >= MXSER_BOARDS) { printk(KERN_ERR "Too many Smartio/Industio family boards find (maximum %d),board not configured\n", MXSER_BOARDS); } else { if (pci_enable_device(pdev)) { printk(KERN_ERR "Moxa SmartI/O PCI enable fail !\n"); continue; } retval = mxser_get_PCI_conf(busnum, devnum, (int) mxser_pcibrds[b].driver_data, &hwconf); if (retval < 0) { if (retval == MXSER_ERR_IRQ) printk(KERN_ERR "Invalid interrupt number,board not configured\n"); else if (retval == MXSER_ERR_IRQ_CONFLIT) printk(KERN_ERR "Invalid interrupt number,board not configured\n"); else if (retval == MXSER_ERR_VECTOR) printk(KERN_ERR "Invalid interrupt vector,board not configured\n"); else if (retval == MXSER_ERR_IOADDR) printk(KERN_ERR "Invalid I/O address,board not configured\n"); continue; } mxser_getcfg(m, &hwconf); //init mxsercfg first, or mxsercfg data is not correct on ISR. //mxser_initbrd will hook ISR. if (mxser_initbrd(m, &hwconf) < 0) continue; m++; } } #endif retval = tty_register_driver(mxvar_sdriver); if (retval) { printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family driver !\n"); put_tty_driver(mxvar_sdriver); for (i = 0; i < MXSER_BOARDS; i++) { if (mxsercfg[i].board_type == -1) continue; else { free_irq(mxsercfg[i].irq, &mxvar_table[i * MXSER_PORTS_PER_BOARD]); //todo: release io, vector } } return retval; } return 0; } static void mxser_do_softint(void *private_) { struct mxser_struct *info = (struct mxser_struct *) private_; struct tty_struct *tty; tty = info->tty; if (tty) { if (test_and_clear_bit(MXSER_EVENT_TXLOW, &info->event)) tty_wakeup(tty); if (test_and_clear_bit(MXSER_EVENT_HANGUP, &info->event)) tty_hangup(tty); } } static unsigned char mxser_get_msr(int baseaddr, int mode, int port, struct mxser_struct *info) { 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; } /* * 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_struct *info; int retval, line; /* initialize driver_data in case something fails */ tty->driver_data = NULL; line = tty->index; if (line == MXSER_PORTS) return 0; if (line < 0 || line > MXSER_PORTS) return -ENODEV; info = mxvar_table + line; if (!info->base) return (-ENODEV); tty->driver_data = info; info->tty = tty; /* * Start up serial port */ retval = mxser_startup(info); if (retval) return (retval); retval = mxser_block_til_ready(tty, filp, info); if (retval) return (retval); info->count++; if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) { if (tty->driver->subtype == SERIAL_TYPE_NORMAL) *tty->termios = info->normal_termios; else *tty->termios = info->callout_termios; mxser_change_speed(info, NULL); } info->session = current->signal->session; info->pgrp = process_group(current); clear_bit(TTY_DONT_FLIP, &tty->flags); //status = mxser_get_msr(info->base, 0, info->port); //mxser_check_modem_status(info, status); /* unmark here for very high baud rate (ex. 921600 bps) used */ tty->low_latency = 1; return 0; } /* * 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_struct *info = (struct mxser_struct *) tty->driver_data; unsigned long timeout; unsigned long flags; struct tty_ldisc *ld; if (tty->index == MXSER_PORTS) return; if (!info) return; spin_lock_irqsave(&info->slock, flags); if (tty_hung_up_p(filp)) { spin_unlock_irqrestore(&info->slock, flags); return; } if ((tty->count == 1) && (info->count != 1)) { /* * Uh, oh. tty->count is 1, which means that the tty * structure will be freed. Info->count should always * be one in these conditions. If it's greater than * one, we've got real problems, since it means the * serial port won't be shutdown. */ printk(KERN_ERR "mxser_close: bad serial port count; tty->count is 1, " "info->count is %d\n", info->count); info->count = 1; } if (--info->count < 0) { printk(KERN_ERR "mxser_close: bad serial port count for ttys%d: %d\n", info->port, info->count); info->count = 0; } if (info->count) { spin_unlock_irqrestore(&info->slock, flags); return; } info->flags |= ASYNC_CLOSING; spin_unlock_irqrestore(&info->slock, flags); /* * Save the termios structure, since this port may have * separate termios for callout and dialin. */ if (info->flags & ASYNC_NORMAL_ACTIVE) info->normal_termios = *tty->termios; /* * Now we wait for the transmit buffer to clear; and we notify * the line discipline to only process XON/XOFF characters. */ tty->closing = 1; if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) tty_wait_until_sent(tty, info->closing_wait); /* * 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->IsMoxaMustChipFlag) info->IER &= ~MOXA_MUST_RECV_ISR; /* by William info->read_status_mask &= ~UART_LSR_DR; */ if (info->flags & ASYNC_INITIALIZED) { outb(info->IER, info->base + 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->base + UART_LSR) & UART_LSR_TEMT)) { schedule_timeout_interruptible(5); if (time_after(jiffies, timeout)) break; } } mxser_shutdown(info); if (tty->driver->flush_buffer) tty->driver->flush_buffer(tty); ld = tty_ldisc_ref(tty); if (ld) { if(ld->flush_buffer) ld->flush_buffer(tty); tty_ldisc_deref(ld); } tty->closing = 0; info->event = 0; info->tty = NULL; if (info->blocked_open) { if (info->close_delay) schedule_timeout_interruptible(info->close_delay); wake_up_interruptible(&info->open_wait); } info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING); wake_up_interruptible(&info->close_wait); } static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count) { int c, total = 0; struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; unsigned long flags; if (!tty || !info->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->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->stopped && !(info->IER & UART_IER_THRI)) { if (!tty->hw_stopped || (info->type == PORT_16550A) || (info->IsMoxaMustChipFlag)) { spin_lock_irqsave(&info->slock, flags); info->IER |= UART_IER_THRI; outb(info->IER, info->base + UART_IER); spin_unlock_irqrestore(&info->slock, flags); } } return total; } static void mxser_put_char(struct tty_struct *tty, unsigned char ch) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; unsigned long flags; if (!tty || !info->xmit_buf) return; if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1) return; spin_lock_irqsave(&info->slock, flags); info->xmit_buf[info->xmit_head++] = ch; info->xmit_head &= SERIAL_XMIT_SIZE - 1; info->xmit_cnt++; spin_unlock_irqrestore(&info->slock, flags); if (!tty->stopped && !(info->IER & UART_IER_THRI)) { if (!tty->hw_stopped || (info->type == PORT_16550A) || info->IsMoxaMustChipFlag) { spin_lock_irqsave(&info->slock, flags); info->IER |= UART_IER_THRI; outb(info->IER, info->base + UART_IER); spin_unlock_irqrestore(&info->slock, flags); } } } static void mxser_flush_chars(struct tty_struct *tty) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; unsigned long flags; if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf || (tty->hw_stopped && (info->type != PORT_16550A) && (!info->IsMoxaMustChipFlag))) return; spin_lock_irqsave(&info->slock, flags); info->IER |= UART_IER_THRI; outb(info->IER, info->base + UART_IER); spin_unlock_irqrestore(&info->slock, flags); } static int mxser_write_room(struct tty_struct *tty) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; int ret; ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; if (ret < 0) ret = 0; return (ret); } static int mxser_chars_in_buffer(struct tty_struct *tty) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; return info->xmit_cnt; } static void mxser_flush_buffer(struct tty_struct *tty) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; char fcr; unsigned long flags; spin_lock_irqsave(&info->slock, flags); info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; /* below added by shinhay */ fcr = inb(info->base + UART_FCR); outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT), info->base + UART_FCR); outb(fcr, info->base + UART_FCR); spin_unlock_irqrestore(&info->slock, flags); /* above added by shinhay */ wake_up_interruptible(&tty->write_wait); if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup) (tty); } static int mxser_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; int retval; struct async_icount cprev, cnow; /* kernel counter temps */ struct serial_icounter_struct __user *p_cuser; unsigned long templ; unsigned long flags; void __user *argp = (void __user *)arg; if (tty->index == MXSER_PORTS) return (mxser_ioctl_special(cmd, argp)); // following add by Victor Yu. 01-05-2004 if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) { int opmode, p; static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f }; int shiftbit; unsigned char val, mask; p = info->port % 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; val = inb(info->opmode_ioaddr); val &= mask; val |= (opmode << shiftbit); outb(val, info->opmode_ioaddr); } else { shiftbit = p * 2; opmode = inb(info->opmode_ioaddr) >> shiftbit; opmode &= OP_MODE_MASK; if (copy_to_user(argp, &opmode, sizeof(int))) return -EFAULT; } return 0; } // above add by Victor Yu. 01-05-2004 if ((cmd != TIOCGSERIAL) && (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { if (tty->flags & (1 << TTY_IO_ERROR)) return (-EIO); } switch (cmd) { case TCSBRK: /* SVID version: non-zero arg --> no break */ retval = tty_check_change(tty); if (retval) return (retval); tty_wait_until_sent(tty, 0); if (!arg) mxser_send_break(info, HZ / 4); /* 1/4 second */ return (0); case TCSBRKP: /* support for POSIX tcsendbreak() */ retval = tty_check_change(tty); if (retval) return (retval); tty_wait_until_sent(tty, 0); mxser_send_break(info, arg ? arg * (HZ / 10) : HZ / 4); return (0); case TIOCGSOFTCAR: return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *) argp); case TIOCSSOFTCAR: if (get_user(templ, (unsigned long __user *) argp)) return -EFAULT; arg = templ; tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0)); return (0); case TIOCGSERIAL: return mxser_get_serial_info(info, argp); case TIOCSSERIAL: return mxser_set_serial_info(info, argp); 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:{ DECLARE_WAITQUEUE(wait, current); int ret; spin_lock_irqsave(&info->slock, flags); cprev = info->icount; /* note the counters on entry */ spin_unlock_irqrestore(&info->slock, flags); add_wait_queue(&info->delta_msr_wait, &wait); while (1) { spin_lock_irqsave(&info->slock, flags); cnow = info->icount; /* atomic copy */ spin_unlock_irqrestore(&info->slock, flags); set_current_state(TASK_INTERRUPTIBLE); if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { ret = 0; break; } /* see if a signal did it */ if (signal_pending(current)) { ret = -ERESTARTSYS; break; } cprev = cnow; } current->state = TASK_RUNNING; remove_wait_queue(&info->delta_msr_wait, &wait); break; } /* NOTREACHED */ /* * 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. */ case TIOCGICOUNT: spin_lock_irqsave(&info->slock, flags); cnow = info->icount; spin_unlock_irqrestore(&info->slock, flags); p_cuser = argp; /* modified by casper 1/11/2000 */ if (put_user(cnow.frame, &p_cuser->frame)) return -EFAULT; if (put_user(cnow.brk, &p_cuser->brk)) return -EFAULT; if (put_user(cnow.overrun, &p_cuser->overrun)) return -EFAULT; if (put_user(cnow.buf_overrun, &p_cuser->buf_overrun)) return -EFAULT; if (put_user(cnow.parity, &p_cuser->parity)) return -EFAULT; if (put_user(cnow.rx, &p_cuser->rx)) return -EFAULT; if (put_user(cnow.tx, &p_cuser->tx)) return -EFAULT; put_user(cnow.cts, &p_cuser->cts); put_user(cnow.dsr, &p_cuser->dsr); put_user(cnow.rng, &p_cuser->rng); put_user(cnow.dcd, &p_cuser->dcd); /* */ return 0; case MOXA_HighSpeedOn: return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *) argp); case MOXA_SDS_RSTICOUNTER:{ info->mon_data.rxcnt = 0; info->mon_data.txcnt = 0; return 0; } // (above) added by James. case MOXA_ASPP_SETBAUD:{ long baud; if (get_user(baud, (long __user *) argp)) return -EFAULT; mxser_set_baud(info, baud); return 0; } case MOXA_ASPP_GETBAUD: if (copy_to_user(argp, &info->realbaud, sizeof(long))) return -EFAULT; return 0; case MOXA_ASPP_OQUEUE:{ int len, lsr; len = mxser_chars_in_buffer(tty); lsr = inb(info->base + UART_LSR) & UART_LSR_TEMT; len += (lsr ? 0 : 1); if (copy_to_user(argp, &len, sizeof(int))) return -EFAULT; return 0; } case MOXA_ASPP_MON:{ int mcr, status; // info->mon_data.ser_param = tty->termios->c_cflag; status = mxser_get_msr(info->base, 1, info->port, info); mxser_check_modem_status(info, status); mcr = inb(info->base + UART_MCR); 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 (info->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 (copy_to_user(argp, &info->err_shadow, sizeof(unsigned char))) 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[info->port] = method; if (copy_to_user(argp, &method, sizeof(int))) return -EFAULT; return 0; } default: return -ENOIOCTLCMD; } return 0; } #ifndef CMSPAR #define CMSPAR 010000000000 #endif static int mxser_ioctl_special(unsigned int cmd, void __user *argp) { int i, result, status; switch (cmd) { case MOXA_GET_CONF: if (copy_to_user(argp, mxsercfg, sizeof(struct mxser_hwconf) * 4)) return -EFAULT; return 0; case MOXA_GET_MAJOR: if (copy_to_user(argp, &ttymajor, sizeof(int))) return -EFAULT; return 0; case MOXA_GET_CUMAJOR: if (copy_to_user(argp, &calloutmajor, sizeof(int))) return -EFAULT; return 0; case MOXA_CHKPORTENABLE: result = 0; for (i = 0; i < MXSER_PORTS; i++) { if (mxvar_table[i].base) result |= (1 << i); } return put_user(result, (unsigned long __user *) argp); case MOXA_GETDATACOUNT: if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log))) return -EFAULT; return (0); case MOXA_GETMSTATUS: for (i = 0; i < MXSER_PORTS; i++) { GMStatus[i].ri = 0; if (!mxvar_table[i].base) { GMStatus[i].dcd = 0; GMStatus[i].dsr = 0; GMStatus[i].cts = 0; continue; } if (!mxvar_table[i].tty || !mxvar_table[i].tty->termios) GMStatus[i].cflag = mxvar_table[i].normal_termios.c_cflag; else GMStatus[i].cflag = mxvar_table[i].tty->termios->c_cflag; status = inb(mxvar_table[i].base + UART_MSR); if (status & 0x80 /*UART_MSR_DCD */ ) GMStatus[i].dcd = 1; else GMStatus[i].dcd = 0; if (status & 0x20 /*UART_MSR_DSR */ ) GMStatus[i].dsr = 1; else GMStatus[i].dsr = 0; if (status & 0x10 /*UART_MSR_CTS */ ) GMStatus[i].cts = 1; else GMStatus[i].cts = 0; } if (copy_to_user(argp, GMStatus, sizeof(struct mxser_mstatus) * MXSER_PORTS)) return -EFAULT; return 0; case MOXA_ASPP_MON_EXT:{ int status; int opmode, p; int shiftbit; unsigned cflag, iflag; for (i = 0; i < MXSER_PORTS; i++) { if (!mxvar_table[i].base) continue; status = mxser_get_msr(mxvar_table[i].base, 0, i, &(mxvar_table[i])); // mxser_check_modem_status(&mxvar_table[i], status); if (status & UART_MSR_TERI) mxvar_table[i].icount.rng++; if (status & UART_MSR_DDSR) mxvar_table[i].icount.dsr++; if (status & UART_MSR_DDCD) mxvar_table[i].icount.dcd++; if (status & UART_MSR_DCTS) mxvar_table[i].icount.cts++; mxvar_table[i].mon_data.modem_status = status; mon_data_ext.rx_cnt[i] = mxvar_table[i].mon_data.rxcnt; mon_data_ext.tx_cnt[i] = mxvar_table[i].mon_data.txcnt; mon_data_ext.up_rxcnt[i] = mxvar_table[i].mon_data.up_rxcnt; mon_data_ext.up_txcnt[i] = mxvar_table[i].mon_data.up_txcnt; mon_data_ext.modem_status[i] = mxvar_table[i].mon_data.modem_status; mon_data_ext.baudrate[i] = mxvar_table[i].realbaud; if (!mxvar_table[i].tty || !mxvar_table[i].tty->termios) { cflag = mxvar_table[i].normal_termios.c_cflag; iflag = mxvar_table[i].normal_termios.c_iflag; } else { cflag = mxvar_table[i].tty->termios->c_cflag; iflag = mxvar_table[i].tty->termios->c_iflag; } mon_data_ext.databits[i] = cflag & CSIZE; mon_data_ext.stopbits[i] = cflag & CSTOPB; mon_data_ext.parity[i] = cflag & (PARENB | PARODD | CMSPAR); mon_data_ext.flowctrl[i] = 0x00; if (cflag & CRTSCTS) mon_data_ext.flowctrl[i] |= 0x03; if (iflag & (IXON | IXOFF)) mon_data_ext.flowctrl[i] |= 0x0C; if (mxvar_table[i].type == PORT_16550A) mon_data_ext.fifo[i] = 1; else mon_data_ext.fifo[i] = 0; p = i % 4; shiftbit = p * 2; opmode = inb(mxvar_table[i].opmode_ioaddr) >> shiftbit; opmode &= OP_MODE_MASK; mon_data_ext.iftype[i] = opmode; } if (copy_to_user(argp, &mon_data_ext, sizeof(struct mxser_mon_ext))) return -EFAULT; return 0; } default: return -ENOIOCTLCMD; } return 0; } static void mxser_stoprx(struct tty_struct *tty) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; //unsigned long flags; info->ldisc_stop_rx = 1; if (I_IXOFF(tty)) { //MX_LOCK(&info->slock); // following add by Victor Yu. 09-02-2002 if (info->IsMoxaMustChipFlag) { info->IER &= ~MOXA_MUST_RECV_ISR; outb(info->IER, info->base + UART_IER); } else { // above add by Victor Yu. 09-02-2002 info->x_char = STOP_CHAR(tty); // outb(info->IER, 0); // mask by Victor Yu. 09-02-2002 outb(0, info->base + UART_IER); info->IER |= UART_IER_THRI; outb(info->IER, info->base + UART_IER); /* force Tx interrupt */ } // add by Victor Yu. 09-02-2002 //MX_UNLOCK(&info->slock); } if (info->tty->termios->c_cflag & CRTSCTS) { //MX_LOCK(&info->slock); info->MCR &= ~UART_MCR_RTS; outb(info->MCR, info->base + UART_MCR); //MX_UNLOCK(&info->slock); } } static void mxser_startrx(struct tty_struct *tty) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; //unsigned long flags; info->ldisc_stop_rx = 0; if (I_IXOFF(tty)) { if (info->x_char) info->x_char = 0; else { //MX_LOCK(&info->slock); // following add by Victor Yu. 09-02-2002 if (info->IsMoxaMustChipFlag) { info->IER |= MOXA_MUST_RECV_ISR; outb(info->IER, info->base + UART_IER); } else { // above add by Victor Yu. 09-02-2002 info->x_char = START_CHAR(tty); // outb(info->IER, 0); // mask by Victor Yu. 09-02-2002 outb(0, info->base + UART_IER); // add by Victor Yu. 09-02-2002 info->IER |= UART_IER_THRI; /* force Tx interrupt */ outb(info->IER, info->base + UART_IER); } // add by Victor Yu. 09-02-2002 //MX_UNLOCK(&info->slock); } } if (info->tty->termios->c_cflag & CRTSCTS) { //MX_LOCK(&info->slock); info->MCR |= UART_MCR_RTS; outb(info->MCR, info->base + UART_MCR); //MX_UNLOCK(&info->slock); } } /* * 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_struct *info = (struct mxser_struct *)tty->driver_data; //unsigned long flags; //MX_LOCK(&info->slock); mxser_stoprx(tty); //MX_UNLOCK(&info->slock); } static void mxser_unthrottle(struct tty_struct *tty) { //struct mxser_struct *info = (struct mxser_struct *)tty->driver_data; //unsigned long flags; //MX_LOCK(&info->slock); mxser_startrx(tty); //MX_UNLOCK(&info->slock); } static void mxser_set_termios(struct tty_struct *tty, struct termios *old_termios) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; unsigned long flags; if ((tty->termios->c_cflag != old_termios->c_cflag) || (RELEVANT_IFLAG(tty->termios->c_iflag) != RELEVANT_IFLAG(old_termios->c_iflag))) { mxser_change_speed(info, old_termios); if ((old_termios->c_cflag & CRTSCTS) && !(tty->termios->c_cflag & CRTSCTS)) { tty->hw_stopped = 0; mxser_start(tty); } } /* Handle sw stopped */ if ((old_termios->c_iflag & IXON) && !(tty->termios->c_iflag & IXON)) { tty->stopped = 0; // following add by Victor Yu. 09-02-2002 if (info->IsMoxaMustChipFlag) { spin_lock_irqsave(&info->slock, flags); DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->base); spin_unlock_irqrestore(&info->slock, flags); } // above add by Victor Yu. 09-02-2002 mxser_start(tty); } } /* * mxser_stop() and mxser_start() * * This routines are called before setting or resetting tty->stopped. * They enable or disable transmitter interrupts, as necessary. */ static void mxser_stop(struct tty_struct *tty) { struct mxser_struct *info = (struct mxser_struct *) 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->base + UART_IER); } spin_unlock_irqrestore(&info->slock, flags); } static void mxser_start(struct tty_struct *tty) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; unsigned long flags; spin_lock_irqsave(&info->slock, flags); if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) { info->IER |= UART_IER_THRI; outb(info->IER, info->base + UART_IER); } spin_unlock_irqrestore(&info->slock, flags); } /* * mxser_wait_until_sent() --- wait until the transmitter is empty */ static void mxser_wait_until_sent(struct tty_struct *tty, int timeout) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; unsigned long orig_jiffies, char_time; 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; #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); printk("jiff=%lu...", jiffies); #endif while (!((lsr = inb(info->base + UART_LSR)) & UART_LSR_TEMT)) { #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("lsr = %d (jiff=%lu)...", lsr, jiffies); #endif schedule_timeout_interruptible(char_time); if (signal_pending(current)) break; if (timeout && time_after(jiffies, orig_jiffies + timeout)) break; } set_current_state(TASK_RUNNING); #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); #endif } /* * This routine is called by tty_hangup() when a hangup is signaled. */ void mxser_hangup(struct tty_struct *tty) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; mxser_flush_buffer(tty); mxser_shutdown(info); info->event = 0; info->count = 0; info->flags &= ~ASYNC_NORMAL_ACTIVE; info->tty = NULL; wake_up_interruptible(&info->open_wait); } // added by James 03-12-2004. /* * mxser_rs_break() --- routine which turns the break handling on or off */ static void mxser_rs_break(struct tty_struct *tty, int break_state) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; unsigned long flags; spin_lock_irqsave(&info->slock, flags); if (break_state == -1) outb(inb(info->base + UART_LCR) | UART_LCR_SBC, info->base + UART_LCR); else outb(inb(info->base + UART_LCR) & ~UART_LCR_SBC, info->base + UART_LCR); spin_unlock_irqrestore(&info->slock, flags); } // (above) added by James. /* * This is the serial driver's generic interrupt routine */ static irqreturn_t mxser_interrupt(int irq, void *dev_id, struct pt_regs *regs) { int status, iir, i; struct mxser_struct *info; struct mxser_struct *port; int max, irqbits, bits, msr; int pass_counter = 0; int handled = IRQ_NONE; port = NULL; //spin_lock(&gm_lock); for (i = 0; i < MXSER_BOARDS; i++) { if (dev_id == &(mxvar_table[i * MXSER_PORTS_PER_BOARD])) { port = dev_id; break; } } if (i == MXSER_BOARDS) { goto irq_stop; } if (port == 0) { goto irq_stop; } max = mxser_numports[mxsercfg[i].board_type - 1]; while (1) { irqbits = inb(port->vector) & port->vectormask; if (irqbits == port->vectormask) { break; } handled = IRQ_HANDLED; for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) { if (irqbits == port->vectormask) { break; } if (bits & irqbits) continue; info = port + i; // following add by Victor Yu. 09-13-2002 iir = inb(info->base + UART_IIR); if (iir & UART_IIR_NO_INT) continue; iir &= MOXA_MUST_IIR_MASK; if (!info->tty) { status = inb(info->base + UART_LSR); outb(0x27, info->base + UART_FCR); inb(info->base + UART_MSR); continue; } // above add by Victor Yu. 09-13-2002 /* if ( info->tty->flip.count < TTY_FLIPBUF_SIZE/4 ){ info->IER |= MOXA_MUST_RECV_ISR; outb(info->IER, info->base + UART_IER); } */ /* mask by Victor Yu. 09-13-2002 if ( !info->tty || (inb(info->base + UART_IIR) & UART_IIR_NO_INT) ) continue; */ /* mask by Victor Yu. 09-02-2002 status = inb(info->base + UART_LSR) & info->read_status_mask; */ // following add by Victor Yu. 09-02-2002 status = inb(info->base + UART_LSR); if (status & UART_LSR_PE) { info->err_shadow |= NPPI_NOTIFY_PARITY; } if (status & UART_LSR_FE) { info->err_shadow |= NPPI_NOTIFY_FRAMING; } if (status & UART_LSR_OE) { info->err_shadow |= NPPI_NOTIFY_HW_OVERRUN; } if (status & UART_LSR_BI) info->err_shadow |= NPPI_NOTIFY_BREAK; if (info->IsMoxaMustChipFlag) { /* if ( (status & 0x02) && !(status & 0x01) ) { outb(info->base+UART_FCR, 0x23); continue; } */ if (iir == MOXA_MUST_IIR_GDA || iir == MOXA_MUST_IIR_RDA || iir == MOXA_MUST_IIR_RTO || iir == MOXA_MUST_IIR_LSR) mxser_receive_chars(info, &status); } else { // above add by Victor Yu. 09-02-2002 status &= info->read_status_mask; if (status & UART_LSR_DR) mxser_receive_chars(info, &status); } msr = inb(info->base + UART_MSR); if (msr & UART_MSR_ANY_DELTA) { mxser_check_modem_status(info, msr); } // following add by Victor Yu. 09-13-2002 if (info->IsMoxaMustChipFlag) { if ((iir == 0x02) && (status & UART_LSR_THRE)) { mxser_transmit_chars(info); } } else { // above add by Victor Yu. 09-13-2002 if (status & UART_LSR_THRE) { /* 8-2-99 by William if ( info->x_char || (info->xmit_cnt > 0) ) */ mxser_transmit_chars(info); } } } if (pass_counter++ > MXSER_ISR_PASS_LIMIT) { break; /* Prevent infinite loops */ } } irq_stop: //spin_unlock(&gm_lock); return handled; } static void mxser_receive_chars(struct mxser_struct *info, int *status) { struct tty_struct *tty = info->tty; unsigned char ch, gdl; int ignored = 0; int cnt = 0; int recv_room; int max = 256; unsigned long flags; spin_lock_irqsave(&info->slock, flags); recv_room = tty->receive_room; if ((recv_room == 0) && (!info->ldisc_stop_rx)) { //mxser_throttle(tty); mxser_stoprx(tty); //return; } // following add by Victor Yu. 09-02-2002 if (info->IsMoxaMustChipFlag != MOXA_OTHER_UART) { if (*status & UART_LSR_SPECIAL) { goto intr_old; } // following add by Victor Yu. 02-11-2004 if (info->IsMoxaMustChipFlag == MOXA_MUST_MU860_HWID && (*status & MOXA_MUST_LSR_RERR)) goto intr_old; // above add by Victor Yu. 02-14-2004 if (*status & MOXA_MUST_LSR_RERR) goto intr_old; gdl = inb(info->base + MOXA_MUST_GDL_REGISTER); if (info->IsMoxaMustChipFlag == MOXA_MUST_MU150_HWID) // add by Victor Yu. 02-11-2004 gdl &= MOXA_MUST_GDL_MASK; if (gdl >= recv_room) { if (!info->ldisc_stop_rx) { //mxser_throttle(tty); mxser_stoprx(tty); } //return; } while (gdl--) { ch = inb(info->base + UART_RX); tty_insert_flip_char(tty, ch, 0); cnt++; /* if((cnt>=HI_WATER) && (info->stop_rx==0)){ mxser_stoprx(tty); info->stop_rx=1; break; } */ } goto end_intr; } intr_old: // above add by Victor Yu. 09-02-2002 do { if (max-- < 0) break; /* if((cnt>=HI_WATER) && (info->stop_rx==0)){ mxser_stoprx(tty); info->stop_rx=1; break; } */ ch = inb(info->base + UART_RX); // following add by Victor Yu. 09-02-2002 if (info->IsMoxaMustChipFlag && (*status & UART_LSR_OE) /*&& !(*status&UART_LSR_DR) */ ) outb(0x23, info->base + UART_FCR); *status &= info->read_status_mask; // above add by Victor Yu. 09-02-2002 if (*status & info->ignore_status_mask) { if (++ignored > 100) break; } else { char flag = 0; if (*status & UART_LSR_SPECIAL) { if (*status & UART_LSR_BI) { flag = TTY_BREAK; /* added by casper 1/11/2000 */ info->icount.brk++; /* */ if (info->flags & ASYNC_SAK) do_SAK(tty); } else if (*status & UART_LSR_PE) { flag = TTY_PARITY; /* added by casper 1/11/2000 */ info->icount.parity++; /* */ } else if (*status & UART_LSR_FE) { flag = TTY_FRAME; /* added by casper 1/11/2000 */ info->icount.frame++; /* */ } else if (*status & UART_LSR_OE) { flag = TTY_OVERRUN; /* added by casper 1/11/2000 */ info->icount.overrun++; /* */ } } tty_insert_flip_char(tty, ch, flag); cnt++; if (cnt >= recv_room) { if (!info->ldisc_stop_rx) { //mxser_throttle(tty); mxser_stoprx(tty); } break; } } // following add by Victor Yu. 09-02-2002 if (info->IsMoxaMustChipFlag) break; // above add by Victor Yu. 09-02-2002 /* mask by Victor Yu. 09-02-2002 *status = inb(info->base + UART_LSR) & info->read_status_mask; */ // following add by Victor Yu. 09-02-2002 *status = inb(info->base + UART_LSR); // above add by Victor Yu. 09-02-2002 } while (*status & UART_LSR_DR); end_intr: // add by Victor Yu. 09-02-2002 mxvar_log.rxcnt[info->port] += cnt; info->mon_data.rxcnt += cnt; info->mon_data.up_rxcnt += cnt; spin_unlock_irqrestore(&info->slock, flags); tty_flip_buffer_push(tty); } static void mxser_transmit_chars(struct mxser_struct *info) { int count, cnt; unsigned long flags; spin_lock_irqsave(&info->slock, flags); if (info->x_char) { outb(info->x_char, info->base + UART_TX); info->x_char = 0; mxvar_log.txcnt[info->port]++; info->mon_data.txcnt++; info->mon_data.up_txcnt++; /* added by casper 1/11/2000 */ info->icount.tx++; /* */ spin_unlock_irqrestore(&info->slock, flags); return; } if (info->xmit_buf == 0) { spin_unlock_irqrestore(&info->slock, flags); return; } if ((info->xmit_cnt <= 0) || info->tty->stopped || (info->tty->hw_stopped && (info->type != PORT_16550A) && (!info->IsMoxaMustChipFlag))) { info->IER &= ~UART_IER_THRI; outb(info->IER, info->base + UART_IER); spin_unlock_irqrestore(&info->slock, flags); return; } cnt = info->xmit_cnt; count = info->xmit_fifo_size; do { outb(info->xmit_buf[info->xmit_tail++], info->base + UART_TX); info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE - 1); if (--info->xmit_cnt <= 0) break; } while (--count > 0); mxvar_log.txcnt[info->port] += (cnt - info->xmit_cnt); // added by James 03-12-2004. info->mon_data.txcnt += (cnt - info->xmit_cnt); info->mon_data.up_txcnt += (cnt - info->xmit_cnt); // (above) added by James. /* added by casper 1/11/2000 */ info->icount.tx += (cnt - info->xmit_cnt); /* */ if (info->xmit_cnt < WAKEUP_CHARS) { set_bit(MXSER_EVENT_TXLOW, &info->event); schedule_work(&info->tqueue); } if (info->xmit_cnt <= 0) { info->IER &= ~UART_IER_THRI; outb(info->IER, info->base + UART_IER); } spin_unlock_irqrestore(&info->slock, flags); } static void mxser_check_modem_status(struct mxser_struct *info, int status) { /* update input line counters */ if (status & UART_MSR_TERI) info->icount.rng++; if (status & UART_MSR_DDSR) info->icount.dsr++; if (status & UART_MSR_DDCD) info->icount.dcd++; if (status & UART_MSR_DCTS) info->icount.cts++; info->mon_data.modem_status = status; wake_up_interruptible(&info->delta_msr_wait); if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) { if (status & UART_MSR_DCD) wake_up_interruptible(&info->open_wait); schedule_work(&info->tqueue); } if (info->flags & ASYNC_CTS_FLOW) { if (info->tty->hw_stopped) { if (status & UART_MSR_CTS) { info->tty->hw_stopped = 0; if ((info->type != PORT_16550A) && (!info->IsMoxaMustChipFlag)) { info->IER |= UART_IER_THRI; outb(info->IER, info->base + UART_IER); } set_bit(MXSER_EVENT_TXLOW, &info->event); schedule_work(&info->tqueue); } } else { if (!(status & UART_MSR_CTS)) { info->tty->hw_stopped = 1; if ((info->type != PORT_16550A) && (!info->IsMoxaMustChipFlag)) { info->IER &= ~UART_IER_THRI; outb(info->IER, info->base + UART_IER); } } } } } static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp, struct mxser_struct *info) { DECLARE_WAITQUEUE(wait, current); int retval; int do_clocal = 0; unsigned long flags; /* * If non-blocking mode is set, or the port is not enabled, * then make the check up front and then exit. */ if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) { info->flags |= ASYNC_NORMAL_ACTIVE; return (0); } if (tty->termios->c_cflag & CLOCAL) do_clocal = 1; /* * Block waiting for the carrier detect and the line to become * free (i.e., not in use by the callout). While we are in * this loop, info->count is dropped by one, so that * mxser_close() knows when to free things. We restore it upon * exit, either normal or abnormal. */ retval = 0; add_wait_queue(&info->open_wait, &wait); spin_lock_irqsave(&info->slock, flags); if (!tty_hung_up_p(filp)) info->count--; spin_unlock_irqrestore(&info->slock, flags); info->blocked_open++; while (1) { spin_lock_irqsave(&info->slock, flags); outb(inb(info->base + UART_MCR) | UART_MCR_DTR | UART_MCR_RTS, info->base + UART_MCR); spin_unlock_irqrestore(&info->slock, flags); set_current_state(TASK_INTERRUPTIBLE); if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)) { if (info->flags & ASYNC_HUP_NOTIFY) retval = -EAGAIN; else retval = -ERESTARTSYS; break; } if (!(info->flags & ASYNC_CLOSING) && (do_clocal || (inb(info->base + UART_MSR) & UART_MSR_DCD))) break; if (signal_pending(current)) { retval = -ERESTARTSYS; break; } schedule(); } set_current_state(TASK_RUNNING); remove_wait_queue(&info->open_wait, &wait); if (!tty_hung_up_p(filp)) info->count++; info->blocked_open--; if (retval) return (retval); info->flags |= ASYNC_NORMAL_ACTIVE; return (0); } static int mxser_startup(struct mxser_struct *info) { unsigned long page; unsigned long flags; page = __get_free_page(GFP_KERNEL); if (!page) return (-ENOMEM); spin_lock_irqsave(&info->slock, flags); if (info->flags & ASYNC_INITIALIZED) { free_page(page); spin_unlock_irqrestore(&info->slock, flags); return (0); } if (!info->base || !info->type) { if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); free_page(page); spin_unlock_irqrestore(&info->slock, flags); return (0); } if (info->xmit_buf) free_page(page); else info->xmit_buf = (unsigned char *) page; /* * Clear the FIFO buffers and disable them * (they will be reenabled in mxser_change_speed()) */ if (info->IsMoxaMustChipFlag) outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | MOXA_MUST_FCR_GDA_MODE_ENABLE), info->base + UART_FCR); else outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT), info->base + 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->base + UART_LSR) == 0xff) { spin_unlock_irqrestore(&info->slock, flags); if (capable(CAP_SYS_ADMIN)) { if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); return (0); } else return (-ENODEV); } /* * Clear the interrupt registers. */ (void) inb(info->base + UART_LSR); (void) inb(info->base + UART_RX); (void) inb(info->base + UART_IIR); (void) inb(info->base + UART_MSR); /* * Now, initialize the UART */ outb(UART_LCR_WLEN8, info->base + UART_LCR); /* reset DLAB */ info->MCR = UART_MCR_DTR | UART_MCR_RTS; outb(info->MCR, info->base + UART_MCR); /* * Finally, enable interrupts */ info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; // info->IER = UART_IER_RLSI | UART_IER_RDI; // following add by Victor Yu. 08-30-2002 if (info->IsMoxaMustChipFlag) info->IER |= MOXA_MUST_IER_EGDAI; // above add by Victor Yu. 08-30-2002 outb(info->IER, info->base + UART_IER); /* enable interrupts */ /* * And clear the interrupt registers again for luck. */ (void) inb(info->base + UART_LSR); (void) inb(info->base + UART_RX); (void) inb(info->base + UART_IIR); (void) inb(info->base + UART_MSR); if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags); info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; /* * and set the speed of the serial port */ spin_unlock_irqrestore(&info->slock, flags); mxser_change_speed(info, NULL); info->flags |= ASYNC_INITIALIZED; return (0); } /* * This routine will shutdown a serial port; interrupts maybe disabled, and * DTR is dropped if the hangup on close termio flag is on. */ static void mxser_shutdown(struct mxser_struct *info) { unsigned long flags; if (!(info->flags & ASYNC_INITIALIZED)) return; 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->delta_msr_wait); /* * Free the IRQ, if necessary */ if (info->xmit_buf) { free_page((unsigned long) info->xmit_buf); info->xmit_buf = NULL; } info->IER = 0; outb(0x00, info->base + UART_IER); if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS); outb(info->MCR, info->base + UART_MCR); /* clear Rx/Tx FIFO's */ // following add by Victor Yu. 08-30-2002 if (info->IsMoxaMustChipFlag) outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | MOXA_MUST_FCR_GDA_MODE_ENABLE), info->base + UART_FCR); else // above add by Victor Yu. 08-30-2002 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT), info->base + UART_FCR); /* read data port to reset things */ (void) inb(info->base + UART_RX); if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); info->flags &= ~ASYNC_INITIALIZED; // following add by Victor Yu. 09-23-2002 if (info->IsMoxaMustChipFlag) { SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->base); } // above add by Victor Yu. 09-23-2002 spin_unlock_irqrestore(&info->slock, flags); } /* * This routine is called to set the UART divisor registers to match * the specified baud rate for a serial port. */ static int mxser_change_speed(struct mxser_struct *info, struct termios *old_termios) { unsigned cflag, cval, fcr; int ret = 0; unsigned char status; long baud; unsigned long flags; if (!info->tty || !info->tty->termios) return ret; cflag = info->tty->termios->c_cflag; if (!(info->base)) return ret; #ifndef B921600 #define B921600 (B460800 +1) #endif if (mxser_set_baud_method[info->port] == 0) { switch (cflag & (CBAUD | CBAUDEX)) { case B921600: baud = 921600; break; case B460800: baud = 460800; break; case B230400: baud = 230400; break; case B115200: baud = 115200; break; case B57600: baud = 57600; break; case B38400: baud = 38400; break; case B19200: baud = 19200; break; case B9600: baud = 9600; break; case B4800: baud = 4800; break; case B2400: baud = 2400; break; case B1800: baud = 1800; break; case B1200: baud = 1200; break; case B600: baud = 600; break; case B300: baud = 300; break; case B200: baud = 200; break; case B150: baud = 150; break; case B134: baud = 134; break; case B110: baud = 110; break; case B75: baud = 75; break; case B50: baud = 50; break; default: baud = 0; break; } mxser_set_baud(info, baud); } /* 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->IsMoxaMustChipFlag) { fcr = UART_FCR_ENABLE_FIFO; fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE; SET_MOXA_MUST_FIFO_VALUE(info); } else fcr = 0; } else { fcr = UART_FCR_ENABLE_FIFO; // following add by Victor Yu. 08-30-2002 if (info->IsMoxaMustChipFlag) { fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE; SET_MOXA_MUST_FIFO_VALUE(info); } else { // above add by Victor Yu. 08-30-2002 switch (info->rx_trigger) { 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; if (cflag & CRTSCTS) { info->flags |= ASYNC_CTS_FLOW; info->IER |= UART_IER_MSI; if ((info->type == PORT_16550A) || (info->IsMoxaMustChipFlag)) { info->MCR |= UART_MCR_AFE; //status = mxser_get_msr(info->base, 0, info->port); /* save_flags(flags); cli(); status = inb(baseaddr + UART_MSR); restore_flags(flags);*/ //mxser_check_modem_status(info, status); } else { //status = mxser_get_msr(info->base, 0, info->port); //MX_LOCK(&info->slock); status = inb(info->base + UART_MSR); //MX_UNLOCK(&info->slock); if (info->tty->hw_stopped) { if (status & UART_MSR_CTS) { info->tty->hw_stopped = 0; if ((info->type != PORT_16550A) && (!info->IsMoxaMustChipFlag)) { info->IER |= UART_IER_THRI; outb(info->IER, info->base + UART_IER); } set_bit(MXSER_EVENT_TXLOW, &info->event); schedule_work(&info->tqueue); } } else { if (!(status & UART_MSR_CTS)) { info->tty->hw_stopped = 1; if ((info->type != PORT_16550A) && (!info->IsMoxaMustChipFlag)) { info->IER &= ~UART_IER_THRI; outb(info->IER, info->base + UART_IER); } } } } } else { info->flags &= ~ASYNC_CTS_FLOW; } outb(info->MCR, info->base + UART_MCR); if (cflag & CLOCAL) { info->flags &= ~ASYNC_CHECK_CD; } else { info->flags |= ASYNC_CHECK_CD; info->IER |= UART_IER_MSI; } outb(info->IER, info->base + UART_IER); /* * Set up parity check flag */ info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; if (I_INPCK(info->tty)) info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; if (I_BRKINT(info->tty) || I_PARMRK(info->tty)) info->read_status_mask |= UART_LSR_BI; info->ignore_status_mask = 0; if (I_IGNBRK(info->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(info->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; } } // following add by Victor Yu. 09-02-2002 if (info->IsMoxaMustChipFlag) { spin_lock_irqsave(&info->slock, flags); SET_MOXA_MUST_XON1_VALUE(info->base, START_CHAR(info->tty)); SET_MOXA_MUST_XOFF1_VALUE(info->base, STOP_CHAR(info->tty)); if (I_IXON(info->tty)) { ENABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->base); } else { DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->base); } if (I_IXOFF(info->tty)) { ENABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->base); } else { DISABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->base); } /* if ( I_IXANY(info->tty) ) { info->MCR |= MOXA_MUST_MCR_XON_ANY; ENABLE_MOXA_MUST_XON_ANY_FLOW_CONTROL(info->base); } else { info->MCR &= ~MOXA_MUST_MCR_XON_ANY; DISABLE_MOXA_MUST_XON_ANY_FLOW_CONTROL(info->base); } */ spin_unlock_irqrestore(&info->slock, flags); } // above add by Victor Yu. 09-02-2002 outb(fcr, info->base + UART_FCR); /* set fcr */ outb(cval, info->base + UART_LCR); return ret; } static int mxser_set_baud(struct mxser_struct *info, long newspd) { int quot = 0; unsigned char cval; int ret = 0; unsigned long flags; if (!info->tty || !info->tty->termios) return ret; if (!(info->base)) return ret; if (newspd > info->MaxCanSetBaudRate) return 0; info->realbaud = newspd; if (newspd == 134) { quot = (2 * info->baud_base / 269); } else if (newspd) { quot = info->baud_base / newspd; if (quot == 0) quot = 1; } else { quot = 0; } info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base); info->timeout += HZ / 50; /* Add .02 seconds of slop */ if (quot) { spin_lock_irqsave(&info->slock, flags); info->MCR |= UART_MCR_DTR; outb(info->MCR, info->base + UART_MCR); spin_unlock_irqrestore(&info->slock, flags); } else { spin_lock_irqsave(&info->slock, flags); info->MCR &= ~UART_MCR_DTR; outb(info->MCR, info->base + UART_MCR); spin_unlock_irqrestore(&info->slock, flags); return ret; } cval = inb(info->base + UART_LCR); outb(cval | UART_LCR_DLAB, info->base + UART_LCR); /* set DLAB */ outb(quot & 0xff, info->base + UART_DLL); /* LS of divisor */ outb(quot >> 8, info->base + UART_DLM); /* MS of divisor */ outb(cval, info->base + UART_LCR); /* reset DLAB */ return ret; } /* * ------------------------------------------------------------ * friends of mxser_ioctl() * ------------------------------------------------------------ */ static int mxser_get_serial_info(struct mxser_struct *info, struct serial_struct __user *retinfo) { struct serial_struct tmp; if (!retinfo) return (-EFAULT); memset(&tmp, 0, sizeof(tmp)); tmp.type = info->type; tmp.line = info->port; tmp.port = info->base; tmp.irq = info->irq; tmp.flags = info->flags; tmp.baud_base = info->baud_base; tmp.close_delay = info->close_delay; tmp.closing_wait = info->closing_wait; tmp.custom_divisor = info->custom_divisor; tmp.hub6 = 0; if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) return -EFAULT; return (0); } static int mxser_set_serial_info(struct mxser_struct *info, struct serial_struct __user *new_info) { struct serial_struct new_serial; unsigned int flags; int retval = 0; if (!new_info || !info->base) return (-EFAULT); if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) return -EFAULT; if ((new_serial.irq != info->irq) || (new_serial.port != info->base) || (new_serial.custom_divisor != info->custom_divisor) || (new_serial.baud_base != info->baud_base)) return (-EPERM); flags = info->flags & ASYNC_SPD_MASK; if (!capable(CAP_SYS_ADMIN)) { if ((new_serial.baud_base != info->baud_base) || (new_serial.close_delay != info->close_delay) || ((new_serial.flags & ~ASYNC_USR_MASK) != (info->flags & ~ASYNC_USR_MASK))) return (-EPERM); info->flags = ((info->flags & ~ASYNC_USR_MASK) | (new_serial.flags & ASYNC_USR_MASK)); } else { /* * OK, past this point, all the error checking has been done. * At this point, we start making changes..... */ info->flags = ((info->flags & ~ASYNC_FLAGS) | (new_serial.flags & ASYNC_FLAGS)); info->close_delay = new_serial.close_delay * HZ / 100; info->closing_wait = new_serial.closing_wait * HZ / 100; info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; info->tty->low_latency = 0; //(info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; } /* added by casper, 3/17/2000, for mouse */ info->type = new_serial.type; process_txrx_fifo(info); /* */ if (info->flags & ASYNC_INITIALIZED) { if (flags != (info->flags & ASYNC_SPD_MASK)) { mxser_change_speed(info, NULL); } } else { retval = mxser_startup(info); } 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_struct *info, unsigned int __user *value) { unsigned char status; unsigned int result; unsigned long flags; spin_lock_irqsave(&info->slock, flags); status = inb(info->base + UART_LSR); spin_unlock_irqrestore(&info->slock, flags); result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0); return put_user(result, value); } /* * This routine sends a break character out the serial port. */ static void mxser_send_break(struct mxser_struct *info, int duration) { unsigned long flags; if (!info->base) return; set_current_state(TASK_INTERRUPTIBLE); spin_lock_irqsave(&info->slock, flags); outb(inb(info->base + UART_LCR) | UART_LCR_SBC, info->base + UART_LCR); spin_unlock_irqrestore(&info->slock, flags); schedule_timeout(duration); spin_lock_irqsave(&info->slock, flags); outb(inb(info->base + UART_LCR) & ~UART_LCR_SBC, info->base + UART_LCR); spin_unlock_irqrestore(&info->slock, flags); } static int mxser_tiocmget(struct tty_struct *tty, struct file *file) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; unsigned char control, status; unsigned long flags; if (tty->index == MXSER_PORTS) return (-ENOIOCTLCMD); if (tty->flags & (1 << TTY_IO_ERROR)) return (-EIO); control = info->MCR; spin_lock_irqsave(&info->slock, flags); status = inb(info->base + UART_MSR); if (status & UART_MSR_ANY_DELTA) mxser_check_modem_status(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, struct file *file, unsigned int set, unsigned int clear) { struct mxser_struct *info = (struct mxser_struct *) tty->driver_data; unsigned long flags; if (tty->index == MXSER_PORTS) return -ENOIOCTLCMD; if (tty->flags & (1 << TTY_IO_ERROR)) 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->base + UART_MCR); spin_unlock_irqrestore(&info->slock, flags); return 0; } static int mxser_read_register(int, unsigned short *); static int mxser_program_mode(int); static void mxser_normal_mode(int); static int mxser_get_ISA_conf(int cap, struct mxser_hwconf *hwconf) { int id, i, bits; unsigned short regs[16], irq; unsigned char scratch, scratch2; hwconf->IsMoxaMustChipFlag = MOXA_OTHER_UART; id = mxser_read_register(cap, regs); if (id == C168_ASIC_ID) { hwconf->board_type = MXSER_BOARD_C168_ISA; hwconf->ports = 8; } else if (id == C104_ASIC_ID) { hwconf->board_type = MXSER_BOARD_C104_ISA; hwconf->ports = 4; } else if (id == C102_ASIC_ID) { hwconf->board_type = MXSER_BOARD_C102_ISA; hwconf->ports = 2; } else if (id == CI132_ASIC_ID) { hwconf->board_type = MXSER_BOARD_CI132; hwconf->ports = 2; } else if (id == CI134_ASIC_ID) { hwconf->board_type = MXSER_BOARD_CI134; hwconf->ports = 4; } else if (id == CI104J_ASIC_ID) { hwconf->board_type = MXSER_BOARD_CI104J; hwconf->ports = 4; } else return (0); irq = 0; if (hwconf->ports == 2) { irq = regs[9] & 0xF000; irq = irq | (irq >> 4); if (irq != (regs[9] & 0xFF00)) return (MXSER_ERR_IRQ_CONFLIT); } else if (hwconf->ports == 4) { irq = regs[9] & 0xF000; irq = irq | (irq >> 4); irq = irq | (irq >> 8); if (irq != regs[9]) return (MXSER_ERR_IRQ_CONFLIT); } else if (hwconf->ports == 8) { irq = regs[9] & 0xF000; irq = irq | (irq >> 4); irq = irq | (irq >> 8); if ((irq != regs[9]) || (irq != regs[10])) return (MXSER_ERR_IRQ_CONFLIT); } if (!irq) { return (MXSER_ERR_IRQ); } hwconf->irq = ((int) (irq & 0xF000) >> 12); for (i = 0; i < 8; i++) hwconf->ioaddr[i] = (int) regs[i + 1] & 0xFFF8; if ((regs[12] & 0x80) == 0) { return (MXSER_ERR_VECTOR); } hwconf->vector = (int) regs[11]; /* interrupt vector */ if (id == 1) hwconf->vector_mask = 0x00FF; else hwconf->vector_mask = 0x000F; for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) { if (regs[12] & bits) { hwconf->baud_base[i] = 921600; hwconf->MaxCanSetBaudRate[i] = 921600; // add by Victor Yu. 09-04-2002 } else { hwconf->baud_base[i] = 115200; hwconf->MaxCanSetBaudRate[i] = 115200; // add by Victor Yu. 09-04-2002 } } scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB); outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR); outb(0, cap + UART_EFR); /* EFR is the same as FCR */ outb(scratch2, cap + UART_LCR); outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR); scratch = inb(cap + UART_IIR); if (scratch & 0xC0) hwconf->uart_type = PORT_16550A; else hwconf->uart_type = PORT_16450; if (id == 1) hwconf->ports = 8; else hwconf->ports = 4; request_region(hwconf->ioaddr[0], 8 * hwconf->ports, "mxser(IO)"); request_region(hwconf->vector, 1, "mxser(vector)"); return (hwconf->ports); } #define CHIP_SK 0x01 /* Serial Data Clock in Eprom */ #define CHIP_DO 0x02 /* Serial Data Output in Eprom */ #define CHIP_CS 0x04 /* Serial Chip Select in Eprom */ #define CHIP_DI 0x08 /* Serial Data Input in Eprom */ #define EN_CCMD 0x000 /* Chip's command register */ #define EN0_RSARLO 0x008 /* Remote start address reg 0 */ #define EN0_RSARHI 0x009 /* Remote start address reg 1 */ #define EN0_RCNTLO 0x00A /* Remote byte count reg WR */ #define EN0_RCNTHI 0x00B /* Remote byte count reg WR */ #define EN0_DCFG 0x00E /* Data configuration reg WR */ #define EN0_PORT 0x010 /* Rcv missed frame error counter RD */ #define ENC_PAGE0 0x000 /* Select page 0 of chip registers */ #define ENC_PAGE3 0x0C0 /* Select page 3 of chip registers */ static int mxser_read_register(int port, unsigned short *regs) { int i, k, value, id; unsigned int j; id = mxser_program_mode(port); if (id < 0) return (id); for (i = 0; i < 14; i++) { k = (i & 0x3F) | 0x180; for (j = 0x100; j > 0; j >>= 1) { outb(CHIP_CS, port); if (k & j) { outb(CHIP_CS | CHIP_DO, port); outb(CHIP_CS | CHIP_DO | CHIP_SK, port); /* A? bit of read */ } else { outb(CHIP_CS, port); outb(CHIP_CS | CHIP_SK, port); /* A? bit of read */ } } (void) inb(port); value = 0; for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) { outb(CHIP_CS, port); outb(CHIP_CS | CHIP_SK, port); if (inb(port) & CHIP_DI) value |= j; } regs[i] = value; outb(0, port); } mxser_normal_mode(port); return (id); } static int mxser_program_mode(int port) { int id, i, j, n; //unsigned long flags; spin_lock(&gm_lock); outb(0, port); outb(0, port); outb(0, port); (void) inb(port); (void) inb(port); outb(0, port); (void) inb(port); //restore_flags(flags); spin_unlock(&gm_lock); id = inb(port + 1) & 0x1F; if ((id != C168_ASIC_ID) && (id != C104_ASIC_ID) && (id != C102_ASIC_ID) && (id != CI132_ASIC_ID) && (id != CI134_ASIC_ID) && (id != CI104J_ASIC_ID)) return (-1); for (i = 0, j = 0; i < 4; i++) { n = inb(port + 2); if (n == 'M') { j = 1; } else if ((j == 1) && (n == 1)) { j = 2; break; } else j = 0; } if (j != 2) id = -2; return (id); } static void mxser_normal_mode(int port) { int i, n; outb(0xA5, port + 1); outb(0x80, port + 3); outb(12, port + 0); /* 9600 bps */ outb(0, port + 1); outb(0x03, port + 3); /* 8 data bits */ outb(0x13, port + 4); /* loop back mode */ for (i = 0; i < 16; i++) { n = inb(port + 5); if ((n & 0x61) == 0x60) break; if ((n & 1) == 1) (void) inb(port); } outb(0x00, port + 4); } module_init(mxser_module_init); module_exit(mxser_module_exit);