Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/net/wan/pc300_tty.c b/drivers/net/wan/pc300_tty.c
new file mode 100644
index 0000000..29f84ad
--- /dev/null
+++ b/drivers/net/wan/pc300_tty.c
@@ -0,0 +1,1095 @@
+/*
+ * 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.
+ *
+ * $Log: pc300_tty.c,v $
+ * Revision 3.7 2002/03/07 14:17:09 henrique
+ * License data fixed
+ *
+ * Revision 3.6 2001/12/10 12:29:42 regina
+ * Fix the MLPPP bug
+ *
+ * Revision 3.5 2001/10/31 11:20:05 regina
+ * automatic pppd starts
+ *
+ * Revision 3.4 2001/08/06 12:01:51 regina
+ * problem in DSR_DE bit
+ *
+ * Revision 3.3 2001/07/26 22:58:41 regina
+ * update EDA value
+ *
+ * Revision 3.2 2001/07/12 13:11:20 regina
+ * bug fix - DCD-OFF in pc300 tty driver
+ *
+ * DMA transmission bug fix
+ *
+ * Revision 3.1 2001/06/22 13:13:02 regina
+ * MLPPP implementation
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/if.h>
+#include <linux/skbuff.h>
+/* TTY includes */
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.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 work_struct tty_tx_work; /* tx work - tx interrupt */
+ struct work_struct tty_rx_work; /* rx work - rx interrupt */
+ } st_cpc_tty_area;
+
+/* TTY data structures */
+static struct tty_driver serial_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_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, 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 void cpc_tty_flush_buffer(struct tty_struct *tty);
+static void cpc_tty_hangup(struct tty_struct *tty);
+static void cpc_tty_rx_work(void *data);
+static void cpc_tty_tx_work(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_signal_off(pc300dev_t *pc300dev, unsigned char);
+static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char);
+
+int pc300_tiocmset(struct tty_struct *, struct file *,
+ unsigned int, unsigned int);
+int pc300_tiocmget(struct tty_struct *, struct file *);
+
+/* 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 "signal"
+ */
+static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char signal)
+{
+ 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 %x\n",
+ pc300dev->dev->name, signal);
+ CPC_TTY_LOCK(card, flags);
+ cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
+ cpc_readb(card->hw.scabase+M_REG(CTL,ch))& signal);
+ CPC_TTY_UNLOCK(card,flags);
+}
+
+/*
+ * PC300 TTY set "signal" to ON
+ */
+static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char signal)
+{
+ 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 %x\n",
+ pc300dev->dev->name, signal);
+ CPC_TTY_LOCK(card, flags);
+ cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
+ cpc_readb(card->hw.scabase+M_REG(CTL,ch))& ~signal);
+ 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)
+{
+ unsigned long port;
+ int aux;
+ st_cpc_tty_area * cpc_tty;
+
+ /* hdlcX - X=interface number */
+ port = pc300dev->dev->name[4] - '0';
+ if (port >= CPC_TTY_NPORTS) {
+ printk("%s-tty: invalid interface selected (0-%i): %li",
+ pc300dev->dev->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",
+ pc300dev->dev->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.owner = THIS_MODULE;
+ 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;
+
+ /* 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.tiocmset = pc300_tiocmset;
+ serial_drv.tiocmget = pc300_tiocmget;
+ serial_drv.flush_buffer = cpc_tty_flush_buffer;
+ serial_drv.hangup = cpc_tty_hangup;
+
+ /* register the TTY driver */
+ if (tty_register_driver(&serial_drv)) {
+ printk("%s-tty: Failed to register serial driver! ",
+ pc300dev->dev->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",
+ pc300dev->dev->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;
+
+ INIT_WORK(&cpc_tty->tty_tx_work, cpc_tty_tx_work, (void *)cpc_tty);
+ INIT_WORK(&cpc_tty->tty_rx_work, cpc_tty_rx_work, (void *)port);
+
+ cpc_tty->buf_rx.first = cpc_tty->buf_rx.last = NULL;
+
+ pc300dev->cpc_tty = (void *)cpc_tty;
+
+ aux = strlen(pc300dev->dev->name);
+ memcpy(cpc_tty->name, pc300dev->dev->name, aux);
+ memcpy(&cpc_tty->name[aux], "-tty", 5);
+
+ cpc_open(pc300dev->dev);
+ cpc_tty_signal_off(pc300dev, CTL_DTR);
+
+ 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 = tty->index;
+
+ if ((port < 0) || (port >= CPC_TTY_NPORTS)){
+ CPC_TTY_DBG("pc300_tty: open invalid port %d\n", port);
+ return -ENODEV;
+ }
+
+ cpc_tty = &cpc_tty_area[port];
+
+ if (cpc_tty->state == CPC_TTY_ST_IDLE){
+ CPC_TTY_DBG("%s: open - invalid interface, port=%d\n",
+ cpc_tty->name, tty->index);
+ 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_signal_on(cpc_tty->pc300dev, CTL_DTR);
+ }
+
+ 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_signal_off(cpc_tty->pc300dev, CTL_DTR);
+
+ 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 (!serial_drv.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);
+ }
+ }
+ 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, 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 data len=%i\n",cpc_tty->name,count);
+
+ pc300chan = (pc300ch_t *)((pc300dev_t*)cpc_tty->pc300dev)->chan;
+ stats = hdlc_stats(((pc300dev_t*)cpc_tty->pc300dev)->dev);
+ 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 (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);
+}
+
+int pc300_tiocmset(struct tty_struct *tty, struct file *file,
+ unsigned int set, unsigned int clear)
+{
+ st_cpc_tty_area *cpc_tty;
+
+ CPC_TTY_DBG("%s: set:%x clear:%x\n", __FUNCTION__, set, clear);
+
+ 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 (set & TIOCM_RTS)
+ cpc_tty_signal_on(cpc_tty->pc300dev, CTL_RTS);
+ if (set & TIOCM_DTR)
+ cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
+
+ if (clear & TIOCM_RTS)
+ cpc_tty_signal_off(cpc_tty->pc300dev, CTL_RTS);
+ if (clear & TIOCM_DTR)
+ cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
+
+ return 0;
+}
+
+int pc300_tiocmget(struct tty_struct *tty, struct file *file)
+{
+ unsigned int result;
+ unsigned char status;
+ unsigned long flags;
+ st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *) tty->driver_data;
+ pc300dev_t *pc300dev = cpc_tty->pc300dev;
+ pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
+ pc300_t *card = (pc300_t *) pc300chan->card;
+ int ch = pc300chan->channel;
+
+ cpc_tty = (st_cpc_tty_area *) tty->driver_data;
+
+ CPC_TTY_DBG("%s-tty: tiocmget\n",
+ ((struct net_device*)(pc300dev->hdlc))->name);
+
+ CPC_TTY_LOCK(card, flags);
+ status = cpc_readb(card->hw.scabase+M_REG(CTL,ch));
+ CPC_TTY_UNLOCK(card,flags);
+
+ result = ((status & CTL_DTR) ? TIOCM_DTR : 0) |
+ ((status & CTL_RTS) ? TIOCM_RTS : 0);
+
+ return result;
+}
+
+/*
+ * 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);
+
+ tty_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 (!serial_drv.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);
+ }
+ }
+ cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
+}
+
+/*
+ * PC300 TTY RX work routine
+ * This routine treats RX work
+ * o verify read buffer
+ * o call the line disc. read
+ * o free memory
+ */
+static void cpc_tty_rx_work(void * data)
+{
+ unsigned long port;
+ int i, j;
+ st_cpc_tty_area *cpc_tty;
+ volatile st_cpc_rx_buf * buf;
+ char flags=0,flg_rx=1;
+ struct tty_ldisc *ld;
+
+ if (cpc_tty_cnt == 0) return;
+
+
+ for (i=0; (i < 4) && flg_rx ; i++) {
+ flg_rx = 0;
+ port = (unsigned long)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) {
+ ld = tty_ldisc_ref(cpc_tty->tty);
+ if(ld) {
+ if (ld->receive_buf) {
+ CPC_TTY_DBG("%s: call line disc. receive_buf\n",cpc_tty->name);
+ ld->receive_buf(cpc_tty->tty, (char *)(buf->data), &flags, buf->size);
+ }
+ tty_ldisc_deref(ld);
+ }
+ }
+ 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 work 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 __iomem * ptdescr;
+ volatile unsigned char status;
+ pc300_t *card = (pc300_t *)pc300chan->card;
+ int ch = pc300chan->channel;
+
+ /* dma buf read */
+ ptdescr = (pcsca_bd_t __iomem *)(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 __iomem *)(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 __iomem * ptdescr;
+ struct net_device_stats *stats = hdlc_stats(pc300dev->dev);
+ int rx_len, rx_aux;
+ volatile unsigned char status;
+ unsigned short first_bd = pc300chan->rx_first_bd;
+ st_cpc_rx_buf *new=NULL;
+ 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 __iomem *)(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 __iomem *)(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));
+ }
+ if (new) {
+ kfree(new);
+ new = NULL;
+ }
+ 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 __iomem *)(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(new);
+ new = NULL;
+ 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(new);
+ new = NULL;
+ break; /* read next frame - while(1) */
+ }
+
+ /* read the segment of the frame */
+ if (rx_aux != 0) {
+ memcpy_fromio((new->data + rx_len),
+ (void __iomem *)(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 __iomem *) (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 = NULL;
+ 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_work(&(cpc_tty->tty_rx_work));
+ stats->rx_packets++;
+ }
+ }
+}
+
+/*
+ * PC300 TTY TX work routine
+ *
+ * This routine treats TX interrupt.
+ * o if need call line discipline wakeup
+ * o call wake_up_interruptible
+ */
+static void cpc_tty_tx_work(void *data)
+{
+ st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *) data;
+ struct tty_struct *tty;
+
+ CPC_TTY_DBG("%s: cpc_tty_tx_work 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;
+ }
+ tty_wakeup(tty);
+}
+
+/*
+ * 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 = hdlc_stats(dev->dev);
+ unsigned long flags;
+ volatile pcsca_bd_t __iomem *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 __iomem *)(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 __iomem *)(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", dev->dev->name);
+ return;
+ }
+
+ skb_put (skb, 10 + len);
+ skb->dev = dev->dev;
+ skb->protocol = htons(ETH_P_CUST);
+ skb->mac.raw = skb->data;
+ skb->pkt_type = PACKET_HOST;
+ skb->len = 10 + len;
+
+ memcpy(skb->data,dev->dev->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", pc300dev->dev->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",
+ pc300dev->dev->name, cpc_tty->name);
+ return;
+ }
+
+ if (--cpc_tty_cnt == 0) {
+ if (serial_drv.refcount) {
+ CPC_TTY_DBG("%s: unregister is not possible, refcount=%d",
+ cpc_tty->name, serial_drv.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);
+ }
+ }
+ }
+ 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_work(&(cpc_tty->tty_tx_work));
+}
+
+/*
+ * 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));
+ for (i=0; i < CPC_TTY_NPORTS; i++){
+ memset(&cpc_tty_area[i],0, sizeof(st_cpc_tty_area));
+ }
+}