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Subject[PATCH] - PC300 driver for kernel 2.4 (6/6)
This is the part 6/6

diff -ruN linux-2.4.21-pre5.orig/drivers/net/wan/pc300_tty.c
linux-2.4.21-pre5/drivers/net/wan/pc300_tty.c
--- linux-2.4.21-pre5.orig/drivers/net/wan/pc300_tty.c Thu Jan 1 00:00:00 1970
+++ linux-2.4.21-pre5/drivers/net/wan/pc300_tty.c Thu Feb 27 09:30:44 2003
@@ -0,0 +1,1122 @@
+/*
+ * pc300_tty.c Cyclades-PC300(tm) TTY Driver.
+ *
+ * Author: Regina Kodato <reginak@cyclades.com>
+ *
+ * Copyright: (c) 1999-2002 Cyclades Corp.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/if.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <linux/skbuff.h>
+
+/* TTY includes */
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+
+#include "pc300.h"
+
+/* defines and macros */
+/* TTY Global definitions */
+#define
CPC_TTY_NPORTS
8
/* maximum number of the sync tty connections */
+#define
CPC_TTY_MAJOR
CYCLADES_MAJOR
+#define CPC_TTY_MINOR_START 240 /* minor of the first PC300 interface */
+
+#define CPC_TTY_MAX_MTU 2000
+
+/* tty interface state */
+#define
CPC_TTY_ST_IDLE
0
+#define CPC_TTY_ST_INIT 1 /* configured with MLPPP and up */
+#define CPC_TTY_ST_OPEN 2 /* opened by application */
+
+#define
CPC_TTY_LOCK(card,flags)\
+
do {\
+
spin_lock_irqsave(&card->card_lock, flags); \
+
} while (0)
+
+#define CPC_TTY_UNLOCK(card,flags) \
+
do {\
+
spin_unlock_irqrestore(&card->card_lock, flags); \
+
} while (0)
+
+//#define
CPC_TTY_DBG(format,a...)
printk(format,##a)
+#define
CPC_TTY_DBG(format,a...)
+
+/* data structures */
+typedef struct _st_cpc_rx_buf {
+
struct _st_cpc_rx_buf *next;
+
int
size;
+
unsigned char data[1];
+} st_cpc_rx_buf;
+
+struct st_cpc_rx_list {
+
st_cpc_rx_buf
*first;
+
st_cpc_rx_buf
*last;
+};
+
+typedef
struct _st_cpc_tty_area {
+
int
state; /* state of the TTY interface */
+
int
num_open;
+
unsigned int tty_minor; /* minor this interface */
+
volatile struct st_cpc_rx_list buf_rx; /* ptr. to reception buffer */
+
unsigned char* buf_tx; /* ptr. to transmission buffer */
+
pc300dev_t*
pc300dev;
/* ptr. to info struct in PC300 driver */
+
unsigned char name[20]; /* interf. name + "-tty" */
+
struct tty_struct *tty;
+
struct tq_struct tty_tx_task_queue; /* tx task - tx interrupt */
+
struct tq_struct tty_rx_task_queue; /* rx task - rx interrupt */
+
} st_cpc_tty_area;
+
+/* TTY data structures */
+static struct tty_struct *cpc_tty_serial_table[CPC_TTY_NPORTS];
+static struct termios *cpc_tty_serial_termios[CPC_TTY_NPORTS];
+static struct termios *cpc_tty_serial_termios_locked[CPC_TTY_NPORTS];
+static struct tty_driver serial_drv, callout_drv;
+
+/* local variables */
+st_cpc_tty_area
cpc_tty_area[CPC_TTY_NPORTS];
+
+int cpc_tty_cnt=0; /* number of intrfaces configured with MLPPP */
+int cpc_tty_refcount;
+int cpc_tty_unreg_flag = 0;
+
+/* TTY functions prototype */
+static int cpc_tty_open(struct tty_struct *tty, struct file *flip);
+static void cpc_tty_close(struct tty_struct *tty, struct file *flip);
+static int cpc_tty_write(struct tty_struct *tty, int from_user,
+
const unsigned char *buf, int count);
+static int cpc_tty_write_room(struct tty_struct *tty);
+static int cpc_tty_chars_in_buffer(struct tty_struct *tty);
+static int cpc_tty_ioctl(struct tty_struct *tty, struct file *file,
+
unsigned int cmd, unsigned long arg);
+static void cpc_tty_flush_buffer(struct tty_struct *tty);
+static void cpc_tty_hangup(struct tty_struct *tty);
+static void cpc_tty_rx_task(void *data);
+static void cpc_tty_tx_task(void *data);
+static int cpc_tty_send_to_card(pc300dev_t *dev,void *buf, int len);
+static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx);
+static void cpc_tty_dtr_off(pc300dev_t *pc300dev);
+static void cpc_tty_dtr_on(pc300dev_t *pc300dev);
+
+/* functions called by PC300 driver */
+void cpc_tty_init(pc300dev_t *dev);
+void cpc_tty_unregister_service(pc300dev_t *pc300dev);
+void cpc_tty_receive(pc300dev_t *pc300dev);
+void cpc_tty_trigger_poll(pc300dev_t *pc300dev);
+void cpc_tty_reset_var(void);
+
+/*
+ * PC300 TTY clear DTR signal
+ */
+static void cpc_tty_dtr_off(pc300dev_t *pc300dev)
+{
+
pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
+
pc300_t *card = (pc300_t *) pc300chan->card;
+
int ch = pc300chan->channel;
+
unsigned long flags;
+
+
CPC_TTY_DBG("%s-tty: Clear signal DTR\n",
+
((struct net_device*)(pc300dev->hdlc))->name);
+
CPC_TTY_LOCK(card, flags);
+
cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
+
cpc_readb(card->hw.scabase+M_REG(CTL,ch))& CTL_DTR);
+
CPC_TTY_UNLOCK(card,flags);
+}
+
+/*
+ * PC300 TTY set DTR signal to ON
+ */
+static void cpc_tty_dtr_on(pc300dev_t *pc300dev)
+{
+
pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
+
pc300_t *card = (pc300_t *) pc300chan->card;
+
int ch = pc300chan->channel;
+
unsigned long flags;
+
+
CPC_TTY_DBG("%s-tty: Set signal DTR\n",
+
((struct net_device*)(pc300dev->hdlc))->name);
+
CPC_TTY_LOCK(card, flags);
+
cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
+
cpc_readb(card->hw.scabase+M_REG(CTL,ch))& ~CTL_DTR);
+
CPC_TTY_UNLOCK(card,flags);
+}
+
+/*
+ * PC300 TTY initialization routine
+ *
+ * This routine is called by the PC300 driver during board configuration
+ * (ioctl=SIOCSP300CONF). At this point the adapter is completely
+ * initialized.
+ * o verify kernel version (only 2.4.x)
+ * o register TTY driver
+ * o init cpc_tty_area struct
+ */
+void cpc_tty_init(pc300dev_t *pc300dev)
+{
+
int port, aux;
+
st_cpc_tty_area * cpc_tty;
+
+
if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0)) {
+
printk("%s-tty: Error: TTY driver is supported on 2.4.X kernel!\n",
+
((struct net_device*)(pc300dev->hdlc))->name);
+
return;
+
}
+
+
/* hdlcX - X=interface number */
+
port = ((struct net_device*)(pc300dev->hdlc))->name[4] - '0';
+
if (port >= CPC_TTY_NPORTS) {
+
printk("%s-tty: invalid interface selected (0-%i): %i",
+
((struct net_device*)(pc300dev->hdlc))->name,
+
CPC_TTY_NPORTS-1,port);
+
return;
+
}
+
+
if (cpc_tty_cnt == 0) { /* first TTY connection -> register driver */
+
CPC_TTY_DBG("%s-tty: driver init, major:%i, minor range:%i=%i\n",
+
((struct net_device*)(pc300dev->hdlc))->name,
+
CPC_TTY_MAJOR, CPC_TTY_MINOR_START,
+
CPC_TTY_MINOR_START+CPC_TTY_NPORTS);
+
/* initialize tty driver struct */
+
memset(&serial_drv,0,sizeof(struct tty_driver));
+
serial_drv.magic = TTY_DRIVER_MAGIC;
+
serial_drv.driver_name = "pc300_tty";
+
serial_drv.name = "ttyCP";
+
serial_drv.major = CPC_TTY_MAJOR;
+
serial_drv.minor_start = CPC_TTY_MINOR_START;
+
serial_drv.num = CPC_TTY_NPORTS;
+
serial_drv.type = TTY_DRIVER_TYPE_SERIAL;
+
serial_drv.subtype = SERIAL_TYPE_NORMAL;
+
+
serial_drv.init_termios = tty_std_termios;
+
serial_drv.init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
+
serial_drv.flags = TTY_DRIVER_REAL_RAW;
+
serial_drv.refcount = &cpc_tty_refcount;
+
+
/* tty data structures */
+
serial_drv.table = cpc_tty_serial_table;
+
serial_drv.termios = cpc_tty_serial_termios;
+
serial_drv.termios_locked = cpc_tty_serial_termios_locked;
+
+
/* interface routines from the upper tty layer to the tty driver */
+
serial_drv.open = cpc_tty_open;
+
serial_drv.close = cpc_tty_close;
+
serial_drv.write = cpc_tty_write;
+
serial_drv.write_room = cpc_tty_write_room;
+
serial_drv.chars_in_buffer = cpc_tty_chars_in_buffer;
+
serial_drv.ioctl = cpc_tty_ioctl;
+
serial_drv.flush_buffer = cpc_tty_flush_buffer;
+
serial_drv.hangup = cpc_tty_hangup;
+
+
/* the callout device is just like normal device except for major */
+
/* number and the subtype code */
+
callout_drv = serial_drv;
+
callout_drv.name = "cucp";
+
callout_drv.major = CPC_TTY_MAJOR + 1;
+
callout_drv.subtype = SERIAL_TYPE_CALLOUT;
+
callout_drv.read_proc = 0;
+
callout_drv.proc_entry = 0;
+
+
/* register the TTY driver */
+
if (tty_register_driver(&serial_drv)) {
+
printk("%s-tty: Failed to register serial driver! ",
+
((struct net_device*)(pc300dev->hdlc))->name);
+
return;
+
}
+
+
if (tty_register_driver(&callout_drv)) {
+
CPC_TTY_DBG("%s-tty: Failed to register callout driver! ",
+
((struct net_device*)(pc300dev->hdlc))->name);
+
return;
+
}
+
memset((void *)cpc_tty_area, 0,
+
sizeof(st_cpc_tty_area) * CPC_TTY_NPORTS);
+
}
+
+
cpc_tty = &cpc_tty_area[port];
+
+
if (cpc_tty->state != CPC_TTY_ST_IDLE) {
+
CPC_TTY_DBG("%s-tty: TTY port %i, already in use.\n",
+
((struct net_device*)(pc300dev->hdlc))->name,port);
+
return;
+
}
+
+
cpc_tty_cnt++;
+
cpc_tty->state = CPC_TTY_ST_INIT;
+
cpc_tty->num_open= 0;
+
cpc_tty->tty_minor = port + CPC_TTY_MINOR_START;
+
cpc_tty->pc300dev = pc300dev;
+
+
cpc_tty->tty_tx_task_queue.routine = cpc_tty_tx_task;
+
cpc_tty->tty_tx_task_queue.data = (void *)cpc_tty;
+

+
cpc_tty->tty_rx_task_queue.routine = cpc_tty_rx_task;
+
cpc_tty->tty_rx_task_queue.data = (void *) port;
+

+
cpc_tty->buf_rx.first = cpc_tty->buf_rx.last = 0;
+
+
pc300dev->cpc_tty = (void *)cpc_tty;
+

+
aux = strlen(((struct net_device*)(pc300dev->hdlc))->name);
+
memcpy(cpc_tty->name,((struct net_device*)(pc300dev->hdlc))->name,aux);
+
memcpy(&cpc_tty->name[aux], "-tty", 5);
+

+
cpc_open((struct net_device *)pc300dev->hdlc);
+
cpc_tty_dtr_off(pc300dev);
+
+
CPC_TTY_DBG("%s: Initializing TTY Sync Driver, tty major#%d minor#%i\n",
+
cpc_tty->name,CPC_TTY_MAJOR,cpc_tty->tty_minor);
+
return;
+}
+
+/*
+ * PC300 TTY OPEN routine
+ *
+ * This routine is called by the tty driver to open the interface
+ * o verify minor
+ * o allocate buffer to Rx and Tx
+ */
+static int cpc_tty_open(struct tty_struct *tty, struct file *flip)
+{
+
int port ;
+
st_cpc_tty_area *cpc_tty;
+
+
if (!tty) {
+
return -ENODEV;
+
}
+
+
port = MINOR(tty->device) - tty->driver.minor_start;
+
+
if ((port < 0) || (port >= CPC_TTY_NPORTS)){
+
CPC_TTY_DBG("pc300_tty: open invalid minor %i\n",MINOR(tty->device));
+
return -ENODEV;
+
}
+
+
cpc_tty = &cpc_tty_area[port];
+
+
if (cpc_tty->state == CPC_TTY_ST_IDLE){
+
CPC_TTY_DBG("%s: open - invalid interface, minor=%i\n",
+
cpc_tty->name, MINOR(tty->device));
+
return -ENODEV;
+
}
+
+
if (cpc_tty->num_open == 0) { /* first open of this tty */
+
if (!cpc_tty_area[port].buf_tx){
+
cpc_tty_area[port].buf_tx = kmalloc(CPC_TTY_MAX_MTU,GFP_KERNEL);
+
if (cpc_tty_area[port].buf_tx == 0){
+
CPC_TTY_DBG("%s: error in memory allocation\n",cpc_tty->name);
+
return -ENOMEM;
+
}
+
}
+
+
if (cpc_tty_area[port].buf_rx.first) {
+
unsigned char * aux;
+
while (cpc_tty_area[port].buf_rx.first) {
+
aux = (unsigned char *)cpc_tty_area[port].buf_rx.first;
+
cpc_tty_area[port].buf_rx.first = cpc_tty_area[port].buf_rx.first->next;
+
kfree(aux);
+
}
+
cpc_tty_area[port].buf_rx.first = NULL;
+
cpc_tty_area[port].buf_rx.last = NULL;
+
}
+
+
cpc_tty_area[port].state = CPC_TTY_ST_OPEN;
+
cpc_tty_area[port].tty = tty;
+
tty->driver_data = &cpc_tty_area[port];
+
+
cpc_tty_dtr_on(cpc_tty->pc300dev);
+
}
+
+
cpc_tty->num_open++;
+
+
CPC_TTY_DBG("%s: opening TTY driver\n", cpc_tty->name);
+
+
/* avisar driver PC300 */
+
return 0;
+}
+
+/*
+ * PC300 TTY CLOSE routine
+ *
+ * This routine is called by the tty driver to close the interface
+ * o call close channel in PC300 driver (cpc_closech)
+ * o free Rx and Tx buffers
+ */
+
+static void cpc_tty_close(struct tty_struct *tty, struct file *flip)
+{
+
st_cpc_tty_area *cpc_tty;
+
unsigned long flags;
+
int res;
+
+
if (!tty || !tty->driver_data ) {
+
CPC_TTY_DBG("hdlx-tty: no TTY in close \n");
+
return;
+
}
+
+
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
+
+
if ((cpc_tty->tty != tty)|| (cpc_tty->state != CPC_TTY_ST_OPEN)) {
+
CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
+
return;
+
}
+
+
if (!cpc_tty->num_open) {
+
CPC_TTY_DBG("%s: TTY is closed\n",cpc_tty->name);
+
return;
+
}
+
+
if (--cpc_tty->num_open > 0) {
+
CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
+
return;
+
}
+
+
cpc_tty_dtr_off(cpc_tty->pc300dev);
+
+
CPC_TTY_LOCK(cpc_tty->pc300dev->chan->card, flags); /* lock irq */
+
cpc_tty->tty = NULL;
+
cpc_tty->state = CPC_TTY_ST_INIT;
+
CPC_TTY_UNLOCK(cpc_tty->pc300dev->chan->card, flags); /* unlock irq */
+
+
if (cpc_tty->buf_rx.first) {
+
unsigned char * aux;
+
while (cpc_tty->buf_rx.first) {
+
aux = (unsigned char *)cpc_tty->buf_rx.first;
+
cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
+
kfree(aux);
+
}
+
cpc_tty->buf_rx.first = NULL;
+
cpc_tty->buf_rx.last = NULL;
+
}
+
+
if (cpc_tty->buf_tx) {
+
kfree(cpc_tty->buf_tx);
+
cpc_tty->buf_tx = NULL;
+
}
+
+
CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
+
+
if (!cpc_tty_refcount && cpc_tty_unreg_flag) {
+
cpc_tty_unreg_flag = 0;
+
CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
+
if ((res=tty_unregister_driver(&serial_drv))) {
+
CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
+
cpc_tty->name,res);
+
}
+
if ((res=tty_unregister_driver(&callout_drv))) {
+
CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
+
cpc_tty->name,res);
+
}
+
}
+
return;
+}
+
+/*
+ * PC300 TTY WRITE routine
+ *
+ * This routine is called by the tty driver to write a series of characters
+ * to the tty device. The characters may come from user or kernel space.
+ * o verify the DCD signal
+ * o send characters to board and start the transmission
+ */
+static int cpc_tty_write(struct tty_struct *tty, int from_user,
+
const unsigned char *buf, int count)
+{
+
st_cpc_tty_area *cpc_tty;
+
pc300ch_t *pc300chan;
+
pc300_t *card;
+
int ch;
+
unsigned long flags;
+
struct net_device_stats *stats;
+
+
if (!tty || !tty->driver_data ) {
+
CPC_TTY_DBG("hdlcX-tty: no TTY in write\n");
+
return -ENODEV;
+
}
+
+
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
+
+
if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
+
CPC_TTY_DBG("%s: TTY is not opened\n", cpc_tty->name);
+
return -ENODEV;
+
}
+
+
if (count > CPC_TTY_MAX_MTU) {
+
CPC_TTY_DBG("%s: count is invalid\n",cpc_tty->name);
+
return -EINVAL; /* frame too big */
+
}
+
+
CPC_TTY_DBG("%s: cpc_tty_write %s data len=%i\n",cpc_tty->name,
+
(from_user)?"from user" : "from kernel",count);
+
+
pc300chan = (pc300ch_t *)((pc300dev_t*)cpc_tty->pc300dev)->chan;
+
stats = &((pc300dev_t*)cpc_tty->pc300dev)->hdlc->stats;
+
card = (pc300_t *) pc300chan->card;
+
ch = pc300chan->channel;
+
+
/* verify DCD signal*/
+
if (cpc_readb(card->hw.scabase + M_REG(ST3,ch)) & ST3_DCD) {
+
/* DCD is OFF */
+
CPC_TTY_DBG("%s : DCD is OFF\n", cpc_tty->name);
+
stats->tx_errors++;
+
stats->tx_carrier_errors++;
+
CPC_TTY_LOCK(card, flags);
+
cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_BUF_CLR);
+
+
if (card->hw.type == PC300_TE) {
+
cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2,
+
cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) &
+
~(CPLD_REG2_FALC_LED1 << (2 *ch)));
+
}
+
+
CPC_TTY_UNLOCK(card, flags);
+
+
return -EINVAL;
+
}
+
+
if (from_user) {
+
unsigned char *buf_tmp;
+
+
buf_tmp = cpc_tty->buf_tx;
+
if (copy_from_user(buf_tmp, buf, count)) {
+
/* failed to copy from user */
+
CPC_TTY_DBG("%s: error in copy from user\n",cpc_tty->name);
+
return -EINVAL;
+
}
+
+
if (cpc_tty_send_to_card(cpc_tty->pc300dev, (void*) buf_tmp,count)) {
+
/* failed to send */
+
CPC_TTY_DBG("%s: transmission error\n",cpc_tty->name);
+
return 0;
+
}
+
} else {
+
if (cpc_tty_send_to_card(cpc_tty->pc300dev, (void*)buf, count)) {
+
/* failed to send */
+
CPC_TTY_DBG("%s: trasmition error\n", cpc_tty->name);
+
return 0;
+
}
+
}
+
return count;
+}
+
+/*
+ * PC300 TTY Write Room routine
+ *
+ * This routine returns the numbers of characteres the tty driver will
accept
+ * for queuing to be written.
+ * o return MTU
+ */
+static int cpc_tty_write_room(struct tty_struct *tty)
+{
+
st_cpc_tty_area *cpc_tty;
+
+
if (!tty || !tty->driver_data ) {
+
CPC_TTY_DBG("hdlcX-tty: no TTY to write room\n");
+
return -ENODEV;
+
}
+
+
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
+
+
if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
+
CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
+
return -ENODEV;
+
}
+
+
CPC_TTY_DBG("%s: write room\n",cpc_tty->name);
+
+
return CPC_TTY_MAX_MTU;
+}
+
+/*
+ * PC300 TTY chars in buffer routine
+ *
+ * This routine returns the chars number in the transmission buffer
+ * o returns 0
+ */
+static int cpc_tty_chars_in_buffer(struct tty_struct *tty)
+{
+
st_cpc_tty_area *cpc_tty;
+
+
if (!tty || !tty->driver_data ) {
+
CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
+
return -ENODEV;
+
}
+
+
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
+
+
if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
+
CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
+
return -ENODEV;
+
}
+
+
return(0);
+}
+
+/*
+ * PC300 TTY IOCTL routine
+ *
+ * This routine treats TIOCMBIS (set DTR signal) and TIOCMBIC (clear DTR
+ * signal)IOCTL commands.
+ */
+static int cpc_tty_ioctl(struct tty_struct *tty, struct file *file,
+
unsigned int cmd, unsigned long arg)
+
+{
+
st_cpc_tty_area *cpc_tty;
+
+
if (!tty || !tty->driver_data ) {
+
CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
+
return -ENODEV;
+
}
+
+
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
+
+
if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
+
CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
+
return -ENODEV;
+
}
+
+
CPC_TTY_DBG("%s: IOCTL cmd %x\n",cpc_tty->name,cmd);
+
+
switch (cmd) {
+
case TIOCMBIS : /* set DTR */
+
cpc_tty_dtr_on(cpc_tty->pc300dev);
+
break;
+
+
case TIOCMBIC: /* clear DTR */
+
cpc_tty_dtr_off(cpc_tty->pc300dev);
+
break;
+
default :
+
return -ENOIOCTLCMD;
+
}
+
return 0;
+}
+
+/*
+ * PC300 TTY Flush Buffer routine
+ *
+ * This routine resets the transmission buffer
+ */
+static void cpc_tty_flush_buffer(struct tty_struct *tty)
+{
+
st_cpc_tty_area *cpc_tty;
+
+
if (!tty || !tty->driver_data ) {
+
CPC_TTY_DBG("hdlcX-tty: no TTY to flush buffer\n");
+
return;
+
}
+
+
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
+
+
if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
+
CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
+
return;
+
}
+
+
CPC_TTY_DBG("%s: call wake_up_interruptible\n",cpc_tty->name);
+
+
wake_up_interruptible(&tty->write_wait);
+
+
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup){
+
CPC_TTY_DBG("%s: call line disc. wake up\n",cpc_tty->name);
+
tty->ldisc.write_wakeup(tty);
+
}
+
+
return;
+}
+
+/*
+ * PC300 TTY Hangup routine
+ *
+ * This routine is called by the tty driver to hangup the interface
+ * o clear DTR signal
+ */
+
+static void cpc_tty_hangup(struct tty_struct *tty)
+{
+
st_cpc_tty_area *cpc_tty;
+
int res;
+
+
if (!tty || !tty->driver_data ) {
+
CPC_TTY_DBG("hdlcX-tty: no TTY to hangup\n");
+
return ;
+
}
+
+
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
+
+
if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
+
CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
+
return ;
+
}
+
if (!cpc_tty_refcount && cpc_tty_unreg_flag) {
+
cpc_tty_unreg_flag = 0;
+
CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
+
if ((res=tty_unregister_driver(&serial_drv))) {
+
CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
+
cpc_tty->name,res);
+
}
+
if ((res=tty_unregister_driver(&callout_drv))) {
+
CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
+
cpc_tty->name,res);
+
}
+
}
+
cpc_tty_dtr_off(cpc_tty->pc300dev);
+}
+
+/*
+ * PC300 TTY RX task routine
+ * This routine treats RX task
+ * o verify read buffer
+ * o call the line disc. read
+ * o free memory
+ */
+static void cpc_tty_rx_task(void * data)
+{
+
int port, i, j;
+
st_cpc_tty_area *cpc_tty;
+
volatile st_cpc_rx_buf * buf;
+
char flags=0,flg_rx=1;
+
+
if (cpc_tty_cnt == 0) return;
+
+
for (i=0; (i < 4) && flg_rx ; i++) {
+
flg_rx = 0;
+
port = (int) data;
+
for (j=0; j < CPC_TTY_NPORTS; j++) {
+
cpc_tty = &cpc_tty_area[port];
+
+
if ((buf=cpc_tty->buf_rx.first) != 0) {
+
+
if (cpc_tty->tty && (cpc_tty->tty->ldisc.receive_buf)) {
+
CPC_TTY_DBG("%s: call line disc. receive_buf\n",cpc_tty->name);
+
cpc_tty->tty->ldisc.receive_buf(cpc_tty->tty, buf->data,
+
&flags, buf->size);
+
}
+
cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
+
kfree((unsigned char *)buf);
+
buf = cpc_tty->buf_rx.first;
+
flg_rx = 1;
+
}
+
if (++port == CPC_TTY_NPORTS) port = 0;
+
}
+
}
+}
+
+/*
+ * PC300 TTY RX task routine
+ *
+ * This routine treats RX interrupt.
+ * o read all frames in card
+ * o verify the frame size
+ * o read the frame in rx buffer
+ */
+static void cpc_tty_rx_disc_frame(pc300ch_t *pc300chan)
+{
+
volatile pcsca_bd_t * ptdescr;
+
volatile unsigned char status;
+
pc300_t *card = (pc300_t *)pc300chan->card;
+
int ch = pc300chan->channel;
+
+
/* dma buf read */
+
ptdescr = (pcsca_bd_t *)(card->hw.rambase +
+
RX_BD_ADDR(ch, pc300chan->rx_first_bd));
+
while (pc300chan->rx_first_bd != pc300chan->rx_last_bd) {
+
status = cpc_readb(&ptdescr->status);
+
cpc_writeb(&ptdescr->status, 0);
+
cpc_writeb(&ptdescr->len, 0);
+
pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) &
+
(N_DMA_RX_BUF - 1);
+
if (status & DST_EOM) {
+
break; /* end of message */
+
}
+
ptdescr = (pcsca_bd_t *)(card->hw.rambase + cpc_readl(&ptdescr->next));
+
}
+}
+
+void cpc_tty_receive(pc300dev_t *pc300dev)
+{
+
st_cpc_tty_area *cpc_tty;
+
pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
+
pc300_t *card = (pc300_t *)pc300chan->card;
+
int ch = pc300chan->channel;
+
volatile pcsca_bd_t * ptdescr;
+
struct net_device_stats *stats = &pc300dev->hdlc->stats;
+
int rx_len, rx_aux;
+
volatile unsigned char status;
+
unsigned short first_bd = pc300chan->rx_first_bd;
+
st_cpc_rx_buf
*new;
+
unsigned char dsr_rx;
+
+
if (pc300dev->cpc_tty == NULL) {
+
return;
+
}
+
+
dsr_rx = cpc_readb(card->hw.scabase + DSR_RX(ch));
+
+
cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty;
+
+
while (1) {
+
rx_len = 0;
+
ptdescr = (pcsca_bd_t *)(card->hw.rambase + RX_BD_ADDR(ch, first_bd));
+
while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
+
rx_len += cpc_readw(&ptdescr->len);
+
first_bd = (first_bd + 1) & (N_DMA_RX_BUF - 1);
+
if (status & DST_EOM) {
+
break;
+
}
+
ptdescr=(pcsca_bd_t*)(card->hw.rambase+cpc_readl(&ptdescr->next));
+
}
+
+
if (!rx_len) {
+
if (dsr_rx & DSR_BOF) {
+
/* update EDA */
+
cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
+
RX_BD_ADDR(ch, pc300chan->rx_last_bd));
+
}
+
return;
+
}
+
+
if (rx_len > CPC_TTY_MAX_MTU) {
+
/* Free RX descriptors */
+
CPC_TTY_DBG("%s: frame size is invalid.\n",cpc_tty->name);
+
stats->rx_errors++;
+
stats->rx_frame_errors++;
+
cpc_tty_rx_disc_frame(pc300chan);
+
continue;
+
}
+
+
new = (st_cpc_rx_buf *) kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC);
+
if (new == 0) {
+
cpc_tty_rx_disc_frame(pc300chan);
+
continue;
+
}
+
+
/* dma buf read */
+
ptdescr = (pcsca_bd_t *)(card->hw.rambase +
+
RX_BD_ADDR(ch, pc300chan->rx_first_bd));
+
+
rx_len = 0; /* counter frame size */
+
+
while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
+
rx_aux = cpc_readw(&ptdescr->len);
+
if ((status & (DST_OVR | DST_CRC | DST_RBIT | DST_SHRT | DST_ABT))
+
|| (rx_aux > BD_DEF_LEN)) {
+
CPC_TTY_DBG("%s: reception error\n", cpc_tty->name);
+
stats->rx_errors++;
+
if (status & DST_OVR) {
+
stats->rx_fifo_errors++;
+
}
+
if (status & DST_CRC) {
+
stats->rx_crc_errors++;
+
}
+
if ((status & (DST_RBIT | DST_SHRT | DST_ABT)) ||
+
(rx_aux > BD_DEF_LEN)) {
+
stats->rx_frame_errors++;
+
}
+
/* discard remainig descriptors used by the bad frame */
+
CPC_TTY_DBG("%s: reception error - discard descriptors",
+
cpc_tty->name);
+
cpc_tty_rx_disc_frame(pc300chan);
+
rx_len = 0;
+
kfree((unsigned char *)new);
+
break; /* read next frame - while(1) */
+
}
+
+
if (cpc_tty->state != CPC_TTY_ST_OPEN) {
+
/* Free RX descriptors */
+
cpc_tty_rx_disc_frame(pc300chan);
+
stats->rx_dropped++;
+
rx_len = 0;
+
kfree((unsigned char *)new);
+
break; /* read next frame - while(1) */
+
}
+
+
/* read the segment of the frame */
+
if (rx_aux != 0) {
+
memcpy_fromio((new->data + rx_len),
+
(void *)(card->hw.rambase +
+
cpc_readl(&ptdescr->ptbuf)), rx_aux);
+
rx_len += rx_aux;
+
}
+
cpc_writeb(&ptdescr->status,0);
+
cpc_writeb(&ptdescr->len, 0);
+
pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) &
+
(N_DMA_RX_BUF -1);
+
if (status & DST_EOM)break;
+
+
ptdescr = (pcsca_bd_t *) (card->hw.rambase +
+
cpc_readl(&ptdescr->next));
+
}
+
/* update pointer */
+
pc300chan->rx_last_bd = (pc300chan->rx_first_bd - 1) &
+
(N_DMA_RX_BUF - 1) ;
+
if (!(dsr_rx & DSR_BOF)) {
+
/* update EDA */
+
cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
+
RX_BD_ADDR(ch, pc300chan->rx_last_bd));
+
}
+
if (rx_len != 0) {
+
stats->rx_bytes += rx_len;
+
+
if (pc300dev->trace_on) {
+
cpc_tty_trace(pc300dev, new->data,rx_len, 'R');
+
}
+
new->size = rx_len;
+
new->next = 0;
+
if (cpc_tty->buf_rx.first == 0) {
+
cpc_tty->buf_rx.first = new;
+
cpc_tty->buf_rx.last = new;
+
} else {
+
cpc_tty->buf_rx.last->next = new;
+
cpc_tty->buf_rx.last = new;
+
}
+
schedule_task(&(cpc_tty->tty_rx_task_queue));
+
stats->rx_packets++;
+
}
+
}
+}
+
+/*
+ * PC300 TTY TX task routine
+ *
+ * This routine treats TX interrupt.
+ * o if need call line discipline wakeup
+ * o call wake_up_interruptible
+ */
+static void cpc_tty_tx_task(void *data)
+{
+
st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *) data;
+
struct tty_struct *tty;
+
+
CPC_TTY_DBG("%s: cpc_tty_tx_task init\n",cpc_tty->name);
+
+
if ((tty = cpc_tty->tty) == 0) {
+
CPC_TTY_DBG("%s: the interface is not opened\n",cpc_tty->name);
+
return;
+
}
+
+
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup){
+
CPC_TTY_DBG("%s:call line disc. wakeup\n",cpc_tty->name);
+
tty->ldisc.write_wakeup (tty);
+
}
+
+
wake_up_interruptible(&tty->write_wait);
+}
+
+/*
+ * PC300 TTY send to card routine
+ *
+ * This routine send data to card.
+ * o clear descriptors
+ * o write data to DMA buffers
+ * o start the transmission
+ */
+static int cpc_tty_send_to_card(pc300dev_t *dev,void* buf, int len)
+{
+
pc300ch_t *chan = (pc300ch_t *)dev->chan;
+
pc300_t *card = (pc300_t *)chan->card;
+
int ch = chan->channel;
+
struct net_device_stats *stats = &dev->hdlc->stats;
+
unsigned long flags;
+
volatile pcsca_bd_t * ptdescr;
+
int i, nchar;
+
int tosend = len;
+
int nbuf = ((len - 1)/BD_DEF_LEN) + 1;
+
unsigned char *pdata=buf;
+
+
CPC_TTY_DBG("%s:cpc_tty_send_to_cars len=%i",
+
(st_cpc_tty_area *)dev->cpc_tty->name,len);
+
+
if (nbuf >= card->chan[ch].nfree_tx_bd) {
+
return 1;
+
}
+
+
/* write buffer to DMA buffers */
+
CPC_TTY_DBG("%s: call dma_buf_write\n",
+
(st_cpc_tty_area *)dev->cpc_tty->name);
+
for (i = 0 ; i < nbuf ; i++) {
+
ptdescr = (pcsca_bd_t *)(card->hw.rambase +
+
TX_BD_ADDR(ch, card->chan[ch].tx_next_bd));
+
nchar = (BD_DEF_LEN > tosend) ? tosend : BD_DEF_LEN;
+
if (cpc_readb(&ptdescr->status) & DST_OSB) {
+
memcpy_toio((void *)(card->hw.rambase +
+
cpc_readl(&ptdescr->ptbuf)),
+
&pdata[len - tosend],
+
nchar);
+
card->chan[ch].nfree_tx_bd--;
+
if ((i + 1) == nbuf) {
+
/* This must be the last BD to be used */
+
cpc_writeb(&ptdescr->status, DST_EOM);
+
} else {
+
cpc_writeb(&ptdescr->status, 0);
+
}
+
cpc_writew(&ptdescr->len, nchar);
+
} else {
+
CPC_TTY_DBG("%s: error in dma_buf_write\n",
+
(st_cpc_tty_area *)dev->cpc_tty->name);
+
stats->tx_dropped++;
+
return 1;
+
}
+
tosend -= nchar;
+
card->chan[ch].tx_next_bd =
+
(card->chan[ch].tx_next_bd + 1) & (N_DMA_TX_BUF - 1);
+
}
+
+
if (dev->trace_on) {
+
cpc_tty_trace(dev, buf, len,'T');
+
}
+
+
/* start transmission */
+
CPC_TTY_DBG("%s: start transmission\n",
+
(st_cpc_tty_area *)dev->cpc_tty->name);
+
+
CPC_TTY_LOCK(card, flags);
+
cpc_writeb(card->hw.scabase + DTX_REG(EDAL, ch),
+
TX_BD_ADDR(ch, chan->tx_next_bd));
+
cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_ENA);
+
cpc_writeb(card->hw.scabase + DSR_TX(ch), DSR_DE);
+
+
if (card->hw.type == PC300_TE) {
+
cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2,
+
cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) |
+
(CPLD_REG2_FALC_LED1 << (2 * ch)));
+
}
+
CPC_TTY_UNLOCK(card, flags);
+
return 0;
+}
+
+/*
+ * PC300 TTY trace routine
+ *
+ * This routine send trace of connection to application.
+ * o clear descriptors
+ * o write data to DMA buffers
+ * o start the transmission
+ */
+
+static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx)
+{
+
struct sk_buff *skb;
+
+
if ((skb = dev_alloc_skb(10 + len)) == NULL) {
+
/* out of memory */
+
CPC_TTY_DBG("%s: tty_trace - out of memory\n",
+
((struct net_device *)(dev->hdlc))->name);
+
return;
+
}
+
+
skb_put (skb, 10 + len);
+
skb->dev = (struct net_device *) dev->hdlc;
+
skb->protocol = htons(ETH_P_CUST);
+
skb->mac.raw = skb->data;
+
skb->pkt_type = PACKET_HOST;
+
skb->len = 10 + len;
+
+
memcpy(skb->data,((struct net_device *)(dev->hdlc))->name,5);
+
skb->data[5] = '[';
+
skb->data[6] = rxtx;
+
skb->data[7] = ']';
+
skb->data[8] = ':';
+
skb->data[9] = ' ';
+
memcpy(&skb->data[10], buf, len);
+
netif_rx(skb);
+}
+
+/*
+ * PC300 TTY unregister service routine
+ *
+ * This routine unregister one interface.
+ */
+void cpc_tty_unregister_service(pc300dev_t *pc300dev)
+{
+
st_cpc_tty_area *cpc_tty;
+
ulong flags;
+
int res;
+
+
if ((cpc_tty= (st_cpc_tty_area *) pc300dev->cpc_tty) == 0) {
+
CPC_TTY_DBG("%s: interface is not TTY\n",
+
((struct net_device *)(pc300dev->hdlc))->name);
+
return;
+
}
+
CPC_TTY_DBG("%s: cpc_tty_unregister_service", cpc_tty->name);
+
+
if (cpc_tty->pc300dev != pc300dev) {
+
CPC_TTY_DBG("%s: invalid tty ptr=%s\n",
+
((struct net_device *)(pc300dev->hdlc))->name, cpc_tty->name);
+
return;
+
}
+
+
if (--cpc_tty_cnt == 0) {
+
if (cpc_tty_refcount) {
+
CPC_TTY_DBG("%s: unregister is not possible, refcount=%d",
+
cpc_tty->name, cpc_tty_refcount);
+
cpc_tty_cnt++;
+
cpc_tty_unreg_flag = 1;
+
return;
+
} else {
+
CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
+
if ((res=tty_unregister_driver(&serial_drv))) {
+
CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
+
cpc_tty->name,res);
+
}
+
if ((res=tty_unregister_driver(&callout_drv))) {
+
CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
+
cpc_tty->name,res);
+
}
+
}
+
}
+
CPC_TTY_LOCK(pc300dev->chan->card,flags);
+
cpc_tty->tty = NULL;
+
CPC_TTY_UNLOCK(pc300dev->chan->card, flags);
+
cpc_tty->tty_minor = 0;
+
cpc_tty->state = CPC_TTY_ST_IDLE;
+}
+
+/*
+ * PC300 TTY trigger poll routine
+ * This routine is called by pc300driver to treats Tx interrupt.
+ */
+void cpc_tty_trigger_poll(pc300dev_t *pc300dev)
+{
+
st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty;
+
if (!cpc_tty) {
+
return;
+
}
+
schedule_task(&(cpc_tty->tty_tx_task_queue));
+}
+
+/*
+ * PC300 TTY reset var routine
+ * This routine is called by pc300driver to init the TTY area.
+ */
+
+void cpc_tty_reset_var(void)
+{
+
int i ;
+
+
CPC_TTY_DBG("hdlcX-tty: reset variables\n");
+
/* reset the tty_driver structure - serial_drv */
+
memset(&serial_drv, 0, sizeof(struct tty_driver));
+
memset(&callout_drv, 0, sizeof(struct tty_driver));
+
for (i=0; i < CPC_TTY_NPORTS; i++){
+
memset(&cpc_tty_area[i],0, sizeof(st_cpc_tty_area));
+
}
+}
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