/*
- * $Id: synclink_gt.c,v 4.50 2007/07/25 19:29:25 paulkf Exp $
- *
* Device driver for Microgate SyncLink GT serial adapters.
*
* written by Paul Fulghum for Microgate Corporation
#include <linux/module.h>
-#include <linux/version.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
* module identification
*/
static char *driver_name = "SyncLink GT";
-static char *driver_version = "$Revision: 4.50 $";
static char *tty_driver_name = "synclink_gt";
static char *tty_dev_prefix = "ttySLG";
MODULE_LICENSE("GPL");
static int ttymajor;
static int debug_level;
static int maxframe[MAX_DEVICES];
-static int dosyncppp[MAX_DEVICES];
module_param(ttymajor, int, 0);
module_param(debug_level, int, 0);
module_param_array(maxframe, int, NULL, 0);
-module_param_array(dosyncppp, int, NULL, 0);
MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
-MODULE_PARM_DESC(dosyncppp, "Enable synchronous net device, 0=disable 1=enable");
/*
* tty support and callbacks
char *buf; /* virtual address of data buffer */
unsigned int pdesc; /* physical address of this descriptor */
dma_addr_t buf_dma_addr;
+ unsigned short buf_count;
};
#define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
u32 idle_mode;
u32 max_frame_size; /* as set by device config */
- unsigned int raw_rx_size;
+ unsigned int rbuf_fill_level;
unsigned int if_mode;
/* device status */
/* SPPP/Cisco HDLC device parts */
int netcount;
- int dosyncppp;
spinlock_t netlock;
#if SYNCLINK_GENERIC_HDLC
struct net_device *netdev;
static void tx_stop(struct slgt_info *info);
static void tx_set_idle(struct slgt_info *info);
static unsigned int free_tbuf_count(struct slgt_info *info);
+static unsigned int tbuf_bytes(struct slgt_info *info);
static void reset_tbufs(struct slgt_info *info);
static void tdma_reset(struct slgt_info *info);
static void tdma_start(struct slgt_info *info);
return;
DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
- if (!info->port.count)
- return;
-
- if (tty_hung_up_p(filp))
- goto cleanup;
-
- if ((tty->count == 1) && (info->port.count != 1)) {
- /*
- * tty->count is 1 and the tty structure will be freed.
- * info->port.count should be one in this case.
- * if it's not, correct it so that the port is shutdown.
- */
- DBGERR(("%s close: bad refcount; tty->count=1, "
- "info->port.count=%d\n", info->device_name, info->port.count));
- info->port.count = 1;
- }
-
- info->port.count--;
-
- /* if at least one open remaining, leave hardware active */
- if (info->port.count)
+ if (tty_port_close_start(&info->port, tty, filp) == 0)
goto cleanup;
- info->port.flags |= ASYNC_CLOSING;
-
- /* set tty->closing to notify line discipline to
- * only process XON/XOFF characters. Only the N_TTY
- * discipline appears to use this (ppp does not).
- */
- tty->closing = 1;
-
- /* wait for transmit data to clear all layers */
-
- if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
- DBGINFO(("%s call tty_wait_until_sent\n", info->device_name));
- tty_wait_until_sent(tty, info->port.closing_wait);
- }
-
if (info->port.flags & ASYNC_INITIALIZED)
wait_until_sent(tty, info->timeout);
flush_buffer(tty);
shutdown(info);
- tty->closing = 0;
+ tty_port_close_end(&info->port, tty);
info->port.tty = NULL;
-
- if (info->port.blocked_open) {
- if (info->port.close_delay) {
- msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
- }
- wake_up_interruptible(&info->port.open_wait);
- }
-
- info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
-
- wake_up_interruptible(&info->port.close_wait);
-
cleanup:
DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
}
off_t begin = 0;
struct slgt_info *info;
- len += sprintf(page, "synclink_gt driver:%s\n", driver_version);
+ len += sprintf(page, "synclink_gt driver\n");
info = slgt_device_list;
while( info ) {
static int chars_in_buffer(struct tty_struct *tty)
{
struct slgt_info *info = tty->driver_data;
+ int count;
if (sanity_check(info, tty->name, "chars_in_buffer"))
return 0;
- DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, info->tx_count));
- return info->tx_count;
+ count = tbuf_bytes(info);
+ DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
+ return count;
}
/*
info->ri_chkcount = 0;
info->dsr_chkcount = 0;
- slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR);
+ slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
get_signals(info);
if (info->netcount ||
static int rx_enable(struct slgt_info *info, int enable)
{
unsigned long flags;
- DBGINFO(("%s rx_enable(%d)\n", info->device_name, enable));
+ unsigned int rbuf_fill_level;
+ DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
spin_lock_irqsave(&info->lock,flags);
+ /*
+ * enable[31..16] = receive DMA buffer fill level
+ * 0 = noop (leave fill level unchanged)
+ * fill level must be multiple of 4 and <= buffer size
+ */
+ rbuf_fill_level = ((unsigned int)enable) >> 16;
+ if (rbuf_fill_level) {
+ if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
+ spin_unlock_irqrestore(&info->lock, flags);
+ return -EINVAL;
+ }
+ info->rbuf_fill_level = rbuf_fill_level;
+ rx_stop(info); /* restart receiver to use new fill level */
+ }
+
+ /*
+ * enable[1..0] = receiver enable command
+ * 0 = disable
+ * 1 = enable
+ * 2 = enable or force hunt mode if already enabled
+ */
+ enable &= 3;
if (enable) {
if (!info->rx_enabled)
rx_start(info);
return 0;
}
+static int carrier_raised(struct tty_port *port)
+{
+ unsigned long flags;
+ struct slgt_info *info = container_of(port, struct slgt_info, port);
+
+ spin_lock_irqsave(&info->lock,flags);
+ get_signals(info);
+ spin_unlock_irqrestore(&info->lock,flags);
+ return (info->signals & SerialSignal_DCD) ? 1 : 0;
+}
+
+static void raise_dtr_rts(struct tty_port *port)
+{
+ unsigned long flags;
+ struct slgt_info *info = container_of(port, struct slgt_info, port);
+
+ spin_lock_irqsave(&info->lock,flags);
+ info->signals |= SerialSignal_RTS + SerialSignal_DTR;
+ set_signals(info);
+ spin_unlock_irqrestore(&info->lock,flags);
+}
+
+
/*
* block current process until the device is ready to open
*/
bool do_clocal = false;
bool extra_count = false;
unsigned long flags;
+ int cd;
+ struct tty_port *port = &info->port;
DBGINFO(("%s block_til_ready\n", tty->driver->name));
if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
/* nonblock mode is set or port is not enabled */
- info->port.flags |= ASYNC_NORMAL_ACTIVE;
+ port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
/* Wait for carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
- * this loop, info->port.count is dropped by one, so that
+ * this loop, port->count is dropped by one, so that
* close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
- add_wait_queue(&info->port.open_wait, &wait);
+ add_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&info->lock, flags);
if (!tty_hung_up_p(filp)) {
extra_count = true;
- info->port.count--;
+ port->count--;
}
spin_unlock_irqrestore(&info->lock, flags);
- info->port.blocked_open++;
+ port->blocked_open++;
while (1) {
- if ((tty->termios->c_cflag & CBAUD)) {
- spin_lock_irqsave(&info->lock,flags);
- info->signals |= SerialSignal_RTS + SerialSignal_DTR;
- set_signals(info);
- spin_unlock_irqrestore(&info->lock,flags);
- }
+ if ((tty->termios->c_cflag & CBAUD))
+ tty_port_raise_dtr_rts(port);
set_current_state(TASK_INTERRUPTIBLE);
- if (tty_hung_up_p(filp) || !(info->port.flags & ASYNC_INITIALIZED)){
- retval = (info->port.flags & ASYNC_HUP_NOTIFY) ?
+ if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
+ retval = (port->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS;
break;
}
- spin_lock_irqsave(&info->lock,flags);
- get_signals(info);
- spin_unlock_irqrestore(&info->lock,flags);
+ cd = tty_port_carrier_raised(port);
- if (!(info->port.flags & ASYNC_CLOSING) &&
- (do_clocal || (info->signals & SerialSignal_DCD)) ) {
+ if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
break;
- }
if (signal_pending(current)) {
retval = -ERESTARTSYS;
}
set_current_state(TASK_RUNNING);
- remove_wait_queue(&info->port.open_wait, &wait);
+ remove_wait_queue(&port->open_wait, &wait);
if (extra_count)
- info->port.count++;
- info->port.blocked_open--;
+ port->count++;
+ port->blocked_open--;
if (!retval)
- info->port.flags |= ASYNC_NORMAL_ACTIVE;
+ port->flags |= ASYNC_NORMAL_ACTIVE;
DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
return retval;
if (info->line < MAX_DEVICES) {
if (maxframe[info->line])
info->max_frame_size = maxframe[info->line];
- info->dosyncppp = dosyncppp[info->line];
}
slgt_device_count++;
#endif
}
+static const struct tty_port_operations slgt_port_ops = {
+ .carrier_raised = carrier_raised,
+ .raise_dtr_rts = raise_dtr_rts,
+};
+
/*
* allocate device instance structure, return NULL on failure
*/
driver_name, adapter_num, port_num));
} else {
tty_port_init(&info->port);
+ info->port.ops = &slgt_port_ops;
info->magic = MGSL_MAGIC;
INIT_WORK(&info->task, bh_handler);
info->max_frame_size = 4096;
- info->raw_rx_size = DMABUFSIZE;
+ info->rbuf_fill_level = DMABUFSIZE;
info->port.close_delay = 5*HZ/10;
info->port.closing_wait = 30*HZ;
init_waitqueue_head(&info->status_event_wait_q);
struct slgt_info *info;
struct slgt_info *tmp;
- printk("unload %s %s\n", driver_name, driver_version);
+ printk(KERN_INFO "unload %s\n", driver_name);
if (serial_driver) {
for (info=slgt_device_list ; info != NULL ; info=info->next_device)
{
int rc;
- printk("%s %s\n", driver_name, driver_version);
+ printk(KERN_INFO "%s\n", driver_name);
serial_driver = alloc_tty_driver(MAX_DEVICES);
if (!serial_driver) {
goto error;
}
- printk("%s %s, tty major#%d\n",
- driver_name, driver_version,
- serial_driver->major);
+ printk(KERN_INFO "%s, tty major#%d\n",
+ driver_name, serial_driver->major);
slgt_device_count = 0;
if ((rc = pci_register_driver(&pci_driver)) < 0) {
* 01 enable
* 00 auto-CTS enable
*/
- val = 0;
+ val = BIT2;
switch(info->params.mode) {
case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
break;
}
+ if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
+ val |= BIT4;
if (info->signals & SerialSignal_DTR)
val |= BIT3;
if (info->signals & SerialSignal_RTS)
while(!done) {
/* reset current buffer for reuse */
info->rbufs[i].status = 0;
- switch(info->params.mode) {
- case MGSL_MODE_RAW:
- case MGSL_MODE_MONOSYNC:
- case MGSL_MODE_BISYNC:
- set_desc_count(info->rbufs[i], info->raw_rx_size);
- break;
- default:
- set_desc_count(info->rbufs[i], DMABUFSIZE);
- }
-
+ set_desc_count(info->rbufs[i], info->rbuf_fill_level);
if (i == last)
done = 1;
if (++i == info->rbuf_count)
DBGBH(("%s rx frame status=%04X size=%d\n",
info->device_name, status, framesize));
- DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, DMABUFSIZE), "rx");
+ DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
if (framesize) {
if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
info->icount.rxok++;
while(copy_count) {
- int partial_count = min(copy_count, DMABUFSIZE);
+ int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
memcpy(p, info->rbufs[i].buf, partial_count);
p += partial_count;
copy_count -= partial_count;
}
/*
+ * return number of bytes in unsent transmit DMA buffers
+ * and the serial controller tx FIFO
+ */
+static unsigned int tbuf_bytes(struct slgt_info *info)
+{
+ unsigned int total_count = 0;
+ unsigned int i = info->tbuf_current;
+ unsigned int reg_value;
+ unsigned int count;
+ unsigned int active_buf_count = 0;
+
+ /*
+ * Add descriptor counts for all tx DMA buffers.
+ * If count is zero (cleared by DMA controller after read),
+ * the buffer is complete or is actively being read from.
+ *
+ * Record buf_count of last buffer with zero count starting
+ * from current ring position. buf_count is mirror
+ * copy of count and is not cleared by serial controller.
+ * If DMA controller is active, that buffer is actively
+ * being read so add to total.
+ */
+ do {
+ count = desc_count(info->tbufs[i]);
+ if (count)
+ total_count += count;
+ else if (!total_count)
+ active_buf_count = info->tbufs[i].buf_count;
+ if (++i == info->tbuf_count)
+ i = 0;
+ } while (i != info->tbuf_current);
+
+ /* read tx DMA status register */
+ reg_value = rd_reg32(info, TDCSR);
+
+ /* if tx DMA active, last zero count buffer is in use */
+ if (reg_value & BIT0)
+ total_count += active_buf_count;
+
+ /* add tx FIFO count = reg_value[15..8] */
+ total_count += (reg_value >> 8) & 0xff;
+
+ /* if transmitter active add one byte for shift register */
+ if (info->tx_active)
+ total_count++;
+
+ return total_count;
+}
+
+/*
* load transmit DMA buffer(s) with data
*/
static void tx_load(struct slgt_info *info, const char *buf, unsigned int size)
set_desc_eof(*d, 0);
set_desc_count(*d, count);
+ d->buf_count = count;
}
info->tbuf_current = i;
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