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    SubjectRe: [ patch 2/5] drivers/serial/jsm: new serial device driver
    The second patch for new jsm serial device driver.

    Signed-off-by: Wen Xiong <wendyx@us.ltcfwd.linux.ibm.com>
    diff -Nuar linux-2.6.11.org/drivers/serial/jsm/jsm_tty.c linux-2.6.11.new/drivers/serial/jsm/jsm_tty.c
    --- linux-2.6.11.org/drivers/serial/jsm/jsm_tty.c 1969-12-31 18:00:00.000000000 -0600
    +++ linux-2.6.11.new/drivers/serial/jsm/jsm_tty.c 2005-03-10 16:34:37.342965976 -0600
    @@ -0,0 +1,1043 @@
    +/************************************************************************
    + * Copyright 2003 Digi International (www.digi.com)
    + *
    + * Copyright (C) 2004 IBM Corporation. All rights reserved.
    + *
    + * 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, or (at your option)
    + * any later version.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; 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., 59 * Temple Place - Suite 330, Boston,
    + * MA 02111-1307, USA.
    + *
    + * Contact Information:
    + * Scott H Kilau <Scott_Kilau@digi.com>
    + * Wendy Xiong <wendyx@us.ltcfwd.linux.ibm.com>
    + *
    + ***********************************************************************/
    +#include <linux/tty.h>
    +#include <linux/tty_flip.h>
    +#include <linux/serial_reg.h>
    +#include <linux/delay.h> /* For udelay */
    +#include <linux/pci.h>
    +
    +#include "jsm.h"
    +
    +static inline int jsm_get_mstat(struct jsm_channel *ch)
    +{
    + unsigned char mstat;
    + unsigned char result;
    +
    + jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "start\n");
    +
    + mstat = (ch->ch_mostat | ch->ch_mistat);
    +
    + result = 0;
    +
    + if (mstat & UART_MCR_DTR)
    + result |= TIOCM_DTR;
    + if (mstat & UART_MCR_RTS)
    + result |= TIOCM_RTS;
    + if (mstat & UART_MSR_CTS)
    + result |= TIOCM_CTS;
    + if (mstat & UART_MSR_DSR)
    + result |= TIOCM_DSR;
    + if (mstat & UART_MSR_RI)
    + result |= TIOCM_RI;
    + if (mstat & UART_MSR_DCD)
    + result |= TIOCM_CD;
    +
    + jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n");
    + return result;
    +}
    +
    +static unsigned int jsm_tty_tx_empty(struct uart_port *port)
    +{
    + return TIOCSER_TEMT;
    +}
    +
    +/*
    + * Return modem signals to ld.
    + */
    +static unsigned int jsm_tty_get_mctrl(struct uart_port *port)
    +{
    + int result;
    + struct jsm_channel *channel = (struct jsm_channel *)port;
    +
    + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
    +
    + result = jsm_get_mstat(channel);
    +
    + if (result < 0)
    + return -ENXIO;
    +
    + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
    +
    + return result;
    +}
    +
    +/*
    + * jsm_set_modem_info()
    + *
    + * Set modem signals, called by ld.
    + */
    +static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl)
    +{
    + struct jsm_channel *channel = (struct jsm_channel *)port;
    +
    + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
    +
    + if (mctrl & TIOCM_RTS)
    + channel->ch_mostat |= UART_MCR_RTS;
    + else
    + channel->ch_mostat &= ~UART_MCR_RTS;
    +
    + if (mctrl & TIOCM_DTR)
    + channel->ch_mostat |= UART_MCR_DTR;
    + else
    + channel->ch_mostat &= ~UART_MCR_DTR;
    +
    + channel->ch_bd->bd_ops->assert_modem_signals(channel);
    +
    + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
    + udelay(10);
    +}
    +
    +static void jsm_tty_start_tx(struct uart_port *port, unsigned int tty_start)
    +{
    + struct jsm_channel *channel = (struct jsm_channel *)port;
    +
    + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
    +
    + channel->ch_flags &= ~(CH_STOP);
    + jsm_tty_write(port);
    +
    + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
    +}
    +
    +static void jsm_tty_stop_tx(struct uart_port *port, unsigned int tty_stop)
    +{
    + struct jsm_channel *channel = (struct jsm_channel *)port;
    +
    + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
    +
    + channel->ch_flags |= (CH_STOP);
    +
    + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
    +}
    +
    +static void jsm_tty_send_xchar(struct uart_port *port, char ch)
    +{
    + unsigned long lock_flags;
    + struct jsm_channel *channel = (struct jsm_channel *)port;
    +
    + spin_lock_irqsave(&port->lock, lock_flags);
    + if (ch == port->info->tty->termios->c_cc[VSTART])
    + channel->ch_bd->bd_ops->send_start_character(channel);
    +
    + if (ch == port->info->tty->termios->c_cc[VSTOP])
    + channel->ch_bd->bd_ops->send_stop_character(channel);
    + spin_unlock_irqrestore(&port->lock, lock_flags);
    +}
    +
    +static void jsm_tty_stop_rx(struct uart_port *port)
    +{
    + struct jsm_channel *channel = (struct jsm_channel *)port;
    +
    + channel->ch_bd->bd_ops->disable_receiver(channel);
    +}
    +
    +static void jsm_tty_break(struct uart_port *port, int break_state)
    +{
    + unsigned long lock_flags;
    + struct jsm_channel *channel = (struct jsm_channel *)port;
    +
    + spin_lock_irqsave(&port->lock, lock_flags);
    + if (break_state == -1)
    + channel->ch_bd->bd_ops->send_break(channel);
    + else
    + channel->ch_bd->bd_ops->clear_break(channel, 0);
    +
    + spin_unlock_irqrestore(&port->lock, lock_flags);
    +}
    +
    +static int jsm_tty_open(struct uart_port *port)
    +{
    + struct jsm_board *brd;
    + int rc = 0;
    + struct jsm_channel *channel = (struct jsm_channel *)port;
    +
    + /* Get board pointer from our array of majors we have allocated */
    + brd = channel->ch_bd;
    +
    + /*
    + * Allocate channel buffers for read/write/error.
    + * Set flag, so we don't get trounced on.
    + */
    + channel->ch_flags |= (CH_OPENING);
    +
    + /* Drop locks, as malloc with GFP_KERNEL can sleep */
    +
    + if (!channel->ch_rqueue) {
    + channel->ch_rqueue = (u8 *) kmalloc(RQUEUESIZE, GFP_KERNEL);
    + if (!channel->ch_rqueue) {
    + jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev,
    + "unable to allocate read queue buf");
    + return -ENOMEM;
    + }
    + memset(channel->ch_rqueue, 0, RQUEUESIZE);
    + }
    + if (!channel->ch_equeue) {
    + channel->ch_equeue = (u8 *) kmalloc(EQUEUESIZE, GFP_KERNEL);
    + if (!channel->ch_equeue) {
    + jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev,
    + "unable to allocate error queue buf");
    + return -ENOMEM;
    + }
    + memset(channel->ch_equeue, 0, EQUEUESIZE);
    + }
    + if (!channel->ch_wqueue) {
    + channel->ch_wqueue = (u8 *) kmalloc(WQUEUESIZE, GFP_KERNEL);
    + if (!channel->ch_wqueue) {
    + jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev,
    + "unable to allocate write queue buf");
    + return -ENOMEM;
    + }
    + memset(channel->ch_wqueue, 0, WQUEUESIZE);
    + }
    +
    + channel->ch_flags &= ~(CH_OPENING);
    + /*
    + * Initialize if neither terminal is open.
    + */
    + jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev,
    + "jsm_open: initializing channel in open...\n");
    +
    + /*
    + * Flush input queues.
    + */
    + channel->ch_r_head = channel->ch_r_tail = 0;
    + channel->ch_e_head = channel->ch_e_tail = 0;
    + channel->ch_w_head = channel->ch_w_tail = 0;
    +
    + brd->bd_ops->flush_uart_write(channel);
    + brd->bd_ops->flush_uart_read(channel);
    +
    + channel->ch_flags = 0;
    + channel->ch_cached_lsr = 0;
    + channel->ch_stops_sent = 0;
    +
    + channel->ch_c_cflag = port->info->tty->termios->c_cflag;
    + channel->ch_c_iflag = port->info->tty->termios->c_iflag;
    + channel->ch_c_oflag = port->info->tty->termios->c_oflag;
    + channel->ch_c_lflag = port->info->tty->termios->c_lflag;
    + channel->ch_startc = port->info->tty->termios->c_cc[VSTART];
    + channel->ch_stopc = port->info->tty->termios->c_cc[VSTOP];
    +
    + /* Tell UART to init itself */
    + brd->bd_ops->uart_init(channel);
    +
    + /*
    + * Run param in case we changed anything
    + */
    + brd->bd_ops->param(channel);
    +
    + jsm_carrier(channel);
    +
    + channel->ch_open_count++;
    +
    + jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n");
    + return rc;
    +}
    +
    +static void jsm_tty_close(struct uart_port *port)
    +{
    + struct jsm_board *bd;
    + struct termios *ts;
    + struct jsm_channel *channel = (struct jsm_channel *)port;
    +
    + jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n");
    +
    + bd = channel->ch_bd;
    + ts = channel->uart_port.info->tty->termios;
    +
    + channel->ch_flags &= ~(CH_STOPI);
    +
    + channel->ch_open_count--;
    +
    + /*
    + * If we have HUPCL set, lower DTR and RTS
    + */
    + if (channel->ch_c_cflag & HUPCL) {
    + jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev,
    + "Close. HUPCL set, dropping DTR/RTS\n");
    +
    + /* Drop RTS/DTR */
    + channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS);
    + bd->bd_ops->assert_modem_signals(channel);
    + }
    +
    + channel->ch_old_baud = 0;
    +
    + /* Turn off UART interrupts for this port */
    + channel->ch_bd->bd_ops->uart_off(channel);
    +
    + jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "finish\n");
    +}
    +
    +static void jsm_tty_set_termios(struct uart_port *port,
    + struct termios *termios,
    + struct termios *old_termios)
    +{
    + unsigned long lock_flags;
    + struct jsm_channel *channel = (struct jsm_channel *)port;
    +
    + spin_lock_irqsave(&port->lock, lock_flags);
    + channel->ch_c_cflag = termios->c_cflag;
    + channel->ch_c_iflag = termios->c_iflag;
    + channel->ch_c_oflag = termios->c_oflag;
    + channel->ch_c_lflag = termios->c_lflag;
    + channel->ch_startc = termios->c_cc[VSTART];
    + channel->ch_stopc = termios->c_cc[VSTOP];
    +
    + channel->ch_bd->bd_ops->param(channel);
    + jsm_carrier(channel);
    + spin_unlock_irqrestore(&port->lock, lock_flags);
    +}
    +
    +static const char *jsm_tty_type(struct uart_port *port)
    +{
    + return "jsm";
    +}
    +
    +static void jsm_tty_release_port(struct uart_port *port)
    +{
    +}
    +
    +static int jsm_tty_request_port(struct uart_port *port)
    +{
    + return 0;
    +}
    +
    +static void jsm_config_port(struct uart_port *port, int flags)
    +{
    + port->type = PORT_JSM;
    +}
    +
    +static struct uart_ops jsm_ops = {
    + .tx_empty = jsm_tty_tx_empty,
    + .set_mctrl = jsm_tty_set_mctrl,
    + .get_mctrl = jsm_tty_get_mctrl,
    + .stop_tx = jsm_tty_stop_tx,
    + .start_tx = jsm_tty_start_tx,
    + .send_xchar = jsm_tty_send_xchar,
    + .stop_rx = jsm_tty_stop_rx,
    + .break_ctl = jsm_tty_break,
    + .startup = jsm_tty_open,
    + .shutdown = jsm_tty_close,
    + .set_termios = jsm_tty_set_termios,
    + .type = jsm_tty_type,
    + .release_port = jsm_tty_release_port,
    + .request_port = jsm_tty_request_port,
    + .config_port = jsm_config_port,
    +};
    +
    +/*
    + * jsm_tty_init()
    + *
    + * Init the tty subsystem. Called once per board after board has been
    + * downloaded and init'ed.
    + */
    +int jsm_tty_init(struct jsm_board *brd)
    +{
    + int i;
    + u8 *vaddr;
    + struct jsm_channel *ch;
    +
    + if (!brd)
    + return -ENXIO;
    +
    + jsm_printk(INIT, INFO, &brd->pci_dev, "start\n");
    +
    + /*
    + * Initialize board structure elements.
    + */
    +
    + vaddr = brd->re_map_membase;
    +
    + brd->nasync = brd->maxports;
    +
    + /*
    + * Allocate channel memory that might not have been allocated
    + * when the driver was first loaded.
    + */
    + for (i = 0; i < brd->nasync; i++) {
    + if (!brd->channels[i]) {
    +
    + /*
    + * Okay to malloc with GFP_KERNEL, we are not at
    + * interrupt context, and there are no locks held.
    + */
    + brd->channels[i] = kmalloc(sizeof(struct jsm_channel), GFP_KERNEL);
    + if (!brd->channels[i]) {
    + jsm_printk(CORE, ERR, &brd->pci_dev,
    + "%s:%d Unable to allocate memory for channel struct\n",
    + __FILE__, __LINE__);
    + }
    + memset(brd->channels[i], 0, sizeof(struct jsm_channel));
    + }
    + }
    +
    + ch = brd->channels[0];
    + vaddr = brd->re_map_membase;
    +
    + /* Set up channel variables */
    + for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
    +
    + if (!brd->channels[i])
    + continue;
    +
    + spin_lock_init(&ch->ch_lock);
    +
    + if (brd->bd_uart_offset == 0x200)
    + ch->ch_neo_uart = (struct neo_uart_struct *) ((u64) vaddr
    + + (brd->bd_uart_offset * i));
    +
    + ch->ch_bd = brd;
    + ch->ch_portnum = i;
    +
    + /* .25 second delay */
    + ch->ch_close_delay = 250;
    +
    + init_waitqueue_head(&ch->ch_flags_wait);
    + }
    +
    + jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n");
    + return 0;
    +}
    +
    +int jsm_uart_port_init(struct jsm_board *brd)
    +{
    + int i;
    + u8 *vaddr;
    + struct jsm_channel *ch;
    +
    + if (!brd)
    + return -ENXIO;
    +
    + jsm_printk(INIT, INFO, &brd->pci_dev, "start\n");
    +
    + /*
    + * Initialize board structure elements.
    + */
    +
    + vaddr = brd->re_map_membase;
    + brd->nasync = brd->maxports;
    +
    + /* Set up channel variables */
    + for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
    +
    + if (!brd->channels[i])
    + continue;
    +
    + brd->channels[i]->uart_port.irq = brd->irq;
    + brd->channels[i]->uart_port.type = PORT_JSM;
    + brd->channels[i]->uart_port.iotype = UPIO_MEM;
    + brd->channels[i]->uart_port.membase = brd->re_map_membase;
    + brd->channels[i]->uart_port.fifosize = 16;
    + brd->channels[i]->uart_port.ops = &jsm_ops;
    + brd->channels[i]->uart_port.line = brd->channels[i]->ch_portnum + brd->boardnum * 2;
    + if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port))
    + printk(KERN_INFO "Added device failed\n");
    + else
    + printk(KERN_INFO "Added device \n");
    + }
    +
    + jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n");
    + return 0;
    +}
    +
    +int jsm_remove_uart_port(struct jsm_board *brd)
    +{
    + int i;
    + struct jsm_channel *ch;
    +
    + if (!brd)
    + return -ENXIO;
    +
    + jsm_printk(INIT, INFO, &brd->pci_dev, "start\n");
    +
    + /*
    + * Initialize board structure elements.
    + */
    +
    + brd->nasync = brd->maxports;
    +
    + /* Set up channel variables */
    + for (i = 0; i < brd->nasync; i++) {
    +
    + if (!brd->channels[i])
    + continue;
    +
    + ch = brd->channels[i];
    +
    + uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port);
    + }
    +
    + jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n");
    + return 0;
    +}
    +
    +void jsm_input(struct jsm_channel *ch)
    +{
    + struct jsm_board *bd;
    + struct tty_struct *tp;
    + u32 rmask;
    + u16 head;
    + u16 tail;
    + int data_len;
    + u64 lock_flags;
    + int flip_len;
    + int len = 0;
    + int n = 0;
    + char *buf = NULL;
    + char *buf2 = NULL;
    + int s = 0;
    + int i = 0;
    +
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n");
    +
    + if (!ch)
    + return;
    +
    + tp = ch->uart_port.info->tty;
    +
    + bd = ch->ch_bd;
    + if(!bd)
    + return;
    +
    + spin_lock_irqsave(&ch->ch_lock, lock_flags);
    +
    + /*
    + *Figure the number of characters in the buffer.
    + *Exit immediately if none.
    + */
    +
    + rmask = RQUEUEMASK;
    +
    + head = ch->ch_r_head & rmask;
    + tail = ch->ch_r_tail & rmask;
    +
    + data_len = (head - tail) & rmask;
    + if (data_len == 0) {
    + spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
    + return;
    + }
    +
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n");
    +
    + /*
    + *If the device is not open, or CREAD is off, flush
    + *input data and return immediately.
    + */
    + if (!tp ||
    + !(tp->termios->c_cflag & CREAD) ) {
    +
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
    + "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum);
    + ch->ch_r_head = tail;
    +
    + /* Force queue flow control to be released, if needed */
    + jsm_check_queue_flow_control(ch);
    +
    + spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
    + return;
    + }
    +
    + /*
    + * If we are throttled, simply don't read any data.
    + */
    + if (ch->ch_flags & CH_STOPI) {
    + spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
    + "Port %d throttled, not reading any data. head: %x tail: %x\n",
    + ch->ch_portnum, head, tail);
    + return;
    + }
    +
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n");
    +
    + /*
    + * If the rxbuf is empty and we are not throttled, put as much
    + * as we can directly into the linux TTY flip buffer.
    + * The jsm_rawreadok case takes advantage of carnal knowledge that
    + * the char_buf and the flag_buf are next to each other and
    + * are each of (2 * TTY_FLIPBUF_SIZE) size.
    + *
    + * NOTE: if(!tty->real_raw), the call to ldisc.receive_buf
    + *actually still uses the flag buffer, so you can't
    + *use it for input data
    + */
    + if (jsm_rawreadok) {
    + if (tp->real_raw)
    + flip_len = MYFLIPLEN;
    + else
    + flip_len = 2 * TTY_FLIPBUF_SIZE;
    + } else
    + flip_len = TTY_FLIPBUF_SIZE - tp->flip.count;
    +
    + len = min(data_len, flip_len);
    + len = min(len, (N_TTY_BUF_SIZE - 1) - tp->read_cnt);
    +
    + if (len <= 0) {
    + spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n");
    + return;
    + }
    +
    + /*
    + * If we're bypassing flip buffers on rx, we can blast it
    + * right into the beginning of the buffer.
    + */
    + if (jsm_rawreadok) {
    + if (tp->real_raw) {
    + if (ch->ch_flags & CH_FLIPBUF_IN_USE) {
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
    + "JSM - FLIPBUF in use. delaying input\n");
    + spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
    + return;
    + }
    + ch->ch_flags |= CH_FLIPBUF_IN_USE;
    + buf = ch->ch_bd->flipbuf;
    + buf2 = NULL;
    + } else {
    + buf = tp->flip.char_buf;
    + buf2 = tp->flip.flag_buf;
    + }
    + } else {
    + buf = tp->flip.char_buf_ptr;
    + buf2 = tp->flip.flag_buf_ptr;
    + }
    +
    + n = len;
    +
    + /*
    + * n now contains the most amount of data we can copy,
    + * bounded either by the flip buffer size or the amount
    + * of data the card actually has pending...
    + */
    + while (n) {
    + s = ((head >= tail) ? head : RQUEUESIZE) - tail;
    + s = min(s, n);
    +
    + if (s <= 0)
    + break;
    +
    + memcpy(buf, ch->ch_rqueue + tail, s);
    +
    + /* buf2 is only set when port isn't raw */
    + if (buf2)
    + memcpy(buf2, ch->ch_equeue + tail, s);
    +
    + tail += s;
    + buf += s;
    + if (buf2)
    + buf2 += s;
    + n -= s;
    + /* Flip queue if needed */
    + tail &= rmask;
    + }
    +
    + /*
    + * In high performance mode, we don't have to update
    + * flag_buf or any of the counts or pointers into flip buf.
    + */
    + if (!jsm_rawreadok) {
    + if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
    + for (i = 0; i < len; i++) {
    + /*
    + * Give the Linux ld the flags in the
    + * format it likes.
    + */
    + if (tp->flip.flag_buf_ptr[i] & UART_LSR_BI)
    + tp->flip.flag_buf_ptr[i] = TTY_BREAK;
    + else if (tp->flip.flag_buf_ptr[i] & UART_LSR_PE)
    + tp->flip.flag_buf_ptr[i] = TTY_PARITY;
    + else if (tp->flip.flag_buf_ptr[i] & UART_LSR_FE)
    + tp->flip.flag_buf_ptr[i] = TTY_FRAME;
    + else
    + tp->flip.flag_buf_ptr[i] = TTY_NORMAL;
    + }
    + } else {
    + memset(tp->flip.flag_buf_ptr, 0, len);
    + }
    +
    + tp->flip.char_buf_ptr += len;
    + tp->flip.flag_buf_ptr += len;
    + tp->flip.count += len;
    + }
    + else if (!tp->real_raw) {
    + if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
    + for (i = 0; i < len; i++) {
    + /*
    + * Give the Linux ld the flags in the
    + * format it likes.
    + */
    + if (tp->flip.flag_buf_ptr[i] & UART_LSR_BI)
    + tp->flip.flag_buf_ptr[i] = TTY_BREAK;
    + else if (tp->flip.flag_buf_ptr[i] & UART_LSR_PE)
    + tp->flip.flag_buf_ptr[i] = TTY_PARITY;
    + else if (tp->flip.flag_buf_ptr[i] & UART_LSR_FE)
    + tp->flip.flag_buf_ptr[i] = TTY_FRAME;
    + else
    + tp->flip.flag_buf_ptr[i] = TTY_NORMAL;
    + }
    + } else
    + memset(tp->flip.flag_buf, 0, len);
    + }
    +
    + /*
    + * If we're doing raw reads, jam it right into the
    + * line disc bypassing the flip buffers.
    + */
    + if (jsm_rawreadok) {
    + if (tp->real_raw) {
    + ch->ch_r_tail = tail & rmask;
    + ch->ch_e_tail = tail & rmask;
    +
    + jsm_check_queue_flow_control(ch);
    +
    + /* !!! WE *MUST* LET GO OF ALL LOCKS BEFORE CALLING RECEIVE BUF !!! */
    +
    + spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
    +
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
    + "jsm_input. %d real_raw len:%d calling receive_buf for board %d\n",
    + __LINE__, len, ch->ch_bd->boardnum);
    + tp->ldisc.receive_buf(tp, ch->ch_bd->flipbuf, NULL, len);
    +
    + /* Allow use of channel flip buffer again */
    + spin_lock_irqsave(&ch->ch_lock, lock_flags);
    + ch->ch_flags &= ~CH_FLIPBUF_IN_USE;
    + spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
    +
    + } else {
    + ch->ch_r_tail = tail & rmask;
    + ch->ch_e_tail = tail & rmask;
    +
    + jsm_check_queue_flow_control(ch);
    +
    + /* !!! WE *MUST* LET GO OF ALL LOCKS BEFORE CALLING RECEIVE BUF !!! */
    + spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
    +
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
    + "jsm_input. %d not real_raw len:%d calling receive_buf for board %d\n",
    + __LINE__, len, ch->ch_bd->boardnum);
    +
    + tp->ldisc.receive_buf(tp, tp->flip.char_buf, tp->flip.flag_buf, len);
    + }
    + } else {
    + ch->ch_r_tail = tail & rmask;
    + ch->ch_e_tail = tail & rmask;
    +
    + jsm_check_queue_flow_control(ch);
    +
    + spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
    +
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
    + "jsm_input. %d not jsm_read raw okay scheduling flip\n", __LINE__);
    + tty_schedule_flip(tp);
    + }
    +
    + jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n");
    +}
    +
    +void jsm_carrier(struct jsm_channel *ch)
    +{
    + struct jsm_board *bd;
    +
    + int virt_carrier = 0;
    + int phys_carrier = 0;
    +
    + jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n");
    + if (!ch)
    + return;
    +
    + bd = ch->ch_bd;
    +
    + if (!bd)
    + return;
    +
    + if (ch->ch_mistat & UART_MSR_DCD) {
    + jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
    + "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD);
    + phys_carrier = 1;
    + }
    +
    + if (ch->ch_c_cflag & CLOCAL)
    + virt_carrier = 1;
    +
    + jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
    + "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier);
    +
    + /*
    + * Test for a VIRTUAL carrier transition to HIGH.
    + */
    + if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) {
    +
    + /*
    + * When carrier rises, wake any threads waiting
    + * for carrier in the open routine.
    + */
    +
    + jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
    + "carrier: virt DCD rose\n");
    +
    + if (waitqueue_active(&(ch->ch_flags_wait)))
    + wake_up_interruptible(&ch->ch_flags_wait);
    + }
    +
    + /*
    + * Test for a PHYSICAL carrier transition to HIGH.
    + */
    + if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) {
    +
    + /*
    + * When carrier rises, wake any threads waiting
    + * for carrier in the open routine.
    + */
    +
    + jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
    + "carrier: physical DCD rose\n");
    +
    + if (waitqueue_active(&(ch->ch_flags_wait)))
    + wake_up_interruptible(&ch->ch_flags_wait);
    + }
    +
    + /*
    + * Test for a PHYSICAL transition to low, so long as we aren't
    + * currently ignoring physical transitions (which is what "virtual
    + * carrier" indicates).
    + *
    + * The transition of the virtual carrier to low really doesn't
    + * matter... it really only means "ignore carrier state", not
    + * "make pretend that carrier is there".
    + */
    + if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0)
    + && (phys_carrier == 0)) {
    + /*
    + * When carrier drops:
    + *
    + * Drop carrier on all open units.
    + *
    + * Flush queues, waking up any task waiting in the
    + * line discipline.
    + *
    + * Send a hangup to the control terminal.
    + *
    + * Enable all select calls.
    + */
    + if (waitqueue_active(&(ch->ch_flags_wait)))
    + wake_up_interruptible(&ch->ch_flags_wait);
    + }
    +
    + /*
    + * Make sure that our cached values reflect the current reality.
    + */
    + if (virt_carrier == 1)
    + ch->ch_flags |= CH_FCAR;
    + else
    + ch->ch_flags &= ~CH_FCAR;
    +
    + if (phys_carrier == 1)
    + ch->ch_flags |= CH_CD;
    + else
    + ch->ch_flags &= ~CH_CD;
    +}
    +
    +
    +void jsm_check_queue_flow_control(struct jsm_channel *ch)
    +{
    + int qleft = 0;
    +
    + /* Store how much space we have left in the queue */
    + if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0)
    + qleft += RQUEUEMASK + 1;
    +
    + /*
    + * Check to see if we should enforce flow control on our queue because
    + * the ld (or user) isn't reading data out of our queue fast enuf.
    + *
    + * NOTE: This is done based on what the current flow control of the
    + * port is set for.
    + *
    + * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt.
    + * This will cause the UART's FIFO to back up, and force
    + * the RTS signal to be dropped.
    + * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to
    + * the other side, in hopes it will stop sending data to us.
    + * 3) NONE - Nothing we can do. We will simply drop any extra data
    + * that gets sent into us when the queue fills up.
    + */
    + if (qleft < 256) {
    + /* HWFLOW */
    + if (ch->ch_c_cflag & CRTSCTS) {
    + if(!(ch->ch_flags & CH_RECEIVER_OFF)) {
    + ch->ch_bd->bd_ops->disable_receiver(ch);
    + ch->ch_flags |= (CH_RECEIVER_OFF);
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
    + "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n",
    + qleft);
    + }
    + }
    + /* SWFLOW */
    + else if (ch->ch_c_iflag & IXOFF) {
    + if (ch->ch_stops_sent <= MAX_STOPS_SENT) {
    + ch->ch_bd->bd_ops->send_stop_character(ch);
    + ch->ch_stops_sent++;
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
    + "Sending stop char! Times sent: %x\n", ch->ch_stops_sent);
    + }
    + }
    + }
    +
    + /*
    + * Check to see if we should unenforce flow control because
    + * ld (or user) finally read enuf data out of our queue.
    + *
    + * NOTE: This is done based on what the current flow control of the
    + * port is set for.
    + *
    + * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt.
    + * This will cause the UART's FIFO to raise RTS back up,
    + * which will allow the other side to start sending data again.
    + * 2) SWFLOW (IXOFF) - Send a start character to
    + * the other side, so it will start sending data to us again.
    + * 3) NONE - Do nothing. Since we didn't do anything to turn off the
    + * other side, we don't need to do anything now.
    + */
    + if (qleft > (RQUEUESIZE / 2)) {
    + /* HWFLOW */
    + if (ch->ch_c_cflag & CRTSCTS) {
    + if (ch->ch_flags & CH_RECEIVER_OFF) {
    + ch->ch_bd->bd_ops->enable_receiver(ch);
    + ch->ch_flags &= ~(CH_RECEIVER_OFF);
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
    + "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n",
    + qleft);
    + }
    + }
    + /* SWFLOW */
    + else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) {
    + ch->ch_stops_sent = 0;
    + ch->ch_bd->bd_ops->send_start_character(ch);
    + jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n");
    + }
    + }
    +}
    +
    +/*
    + * jsm_tty_write()
    + *
    + * Take data from the user or kernel and send it out to the FEP.
    + * In here exists all the Transparent Print magic as well.
    + */
    +int jsm_tty_write(struct uart_port *port)
    +{
    + int bufcount = 0, n = 0;
    + int data_count = 0,data_count1 =0;
    + u16 head;
    + u16 tail;
    + u16 tmask;
    + u32 remain;
    + int temp_tail = port->info->xmit.tail;
    + struct jsm_channel *channel = (struct jsm_channel *)port;
    +
    + tmask = WQUEUEMASK;
    + head = (channel->ch_w_head) & tmask;
    + tail = (channel->ch_w_tail) & tmask;
    +
    + if ((bufcount = tail - head - 1) < 0)
    + bufcount += WQUEUESIZE;
    +
    + n = bufcount;
    +
    + n = min(n, 56);
    + remain = WQUEUESIZE - head;
    +
    + data_count = 0;
    + if (n >= remain) {
    + n -= remain;
    + while ((port->info->xmit.head != temp_tail) &&
    + (data_count < remain)) {
    + channel->ch_wqueue[head++] =
    + port->info->xmit.buf[temp_tail];
    +
    + temp_tail++;
    + temp_tail &= (UART_XMIT_SIZE - 1);
    + data_count++;
    + }
    + if (data_count == remain) head = 0;
    + }
    +
    + data_count1 = 0;
    + if (n > 0) {
    + remain = n;
    + while ((port->info->xmit.head != temp_tail) &&
    + (data_count1 < remain)) {
    + channel->ch_wqueue[head++] =
    + port->info->xmit.buf[temp_tail];
    +
    + temp_tail++;
    + temp_tail &= (UART_XMIT_SIZE - 1);
    + data_count1++;
    +
    + }
    + }
    +
    + port->info->xmit.tail = temp_tail;
    +
    + data_count += data_count1;
    + if (data_count) {
    + head &= tmask;
    + channel->ch_w_head = head;
    + }
    +
    + if (data_count) {
    + channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel);
    + }
    +
    + return data_count;
    +}
    +
    +static ssize_t jsm_driver_version_show(struct device_driver *ddp, char *buf)
    +{
    + return snprintf(buf, PAGE_SIZE, "%s\n", JSM_VERSION);
    +}
    +static DRIVER_ATTR(version, S_IRUSR, jsm_driver_version_show, NULL);
    +
    +static ssize_t jsm_driver_state_show(struct device_driver *ddp, char *buf)
    +{
    + return snprintf(buf, PAGE_SIZE, "%s\n", jsm_driver_state_text[jsm_driver_state]);
    +}
    +static DRIVER_ATTR(state, S_IRUSR, jsm_driver_state_show, NULL);
    +
    +void jsm_create_driver_sysfiles(struct device_driver *driverfs)
    +{
    + driver_create_file(driverfs, &driver_attr_version);
    + driver_create_file(driverfs, &driver_attr_state);
    +}
    +
    +void jsm_remove_driver_sysfiles(struct device_driver *driverfs)
    +{
    + driver_remove_file(driverfs, &driver_attr_version);
    + driver_remove_file(driverfs, &driver_attr_state);
    +}
    \
     
     \ /
      Last update: 2005-03-22 14:11    [W:0.137 / U:0.132 seconds]
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