Re: [ patch 2/5] drivers/serial/jsm: new serial device driver
From: Wen Xiong
Date: Fri Mar 11 2005 - 10:42:46 EST
The second patch for new jsm serial device driver.
Signed-off-by: Wen Xiong <wendyx@xxxxxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxx>
+ * Wendy Xiong <wendyx@xxxxxxxxxxxxxxxxxxxxxxx>
+ *
+ ***********************************************************************/
+#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);
+}