/*
- * $Id: synclink_gt.c,v 4.36 2006/08/28 20:47:14 paulkf Exp $
+ * $Id: synclink_gt.c,v 4.50 2007/07/25 19:29:25 paulkf Exp $
*
* Device driver for Microgate SyncLink GT serial adapters.
*
#include <linux/bitops.h>
#include <linux/workqueue.h>
#include <linux/hdlc.h>
+#include <linux/synclink.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/types.h>
#include <asm/uaccess.h>
-#include "linux/synclink.h"
-
#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
#define SYNCLINK_GENERIC_HDLC 1
#else
* module identification
*/
static char *driver_name = "SyncLink GT";
-static char *driver_version = "$Revision: 4.36 $";
+static char *driver_version = "$Revision: 4.50 $";
static char *tty_driver_name = "synclink_gt";
static char *tty_dev_prefix = "ttySLG";
MODULE_LICENSE("GPL");
*/
struct slgt_desc
{
- unsigned short count;
- unsigned short status;
- unsigned int pbuf; /* physical address of data buffer */
- unsigned int next; /* physical address of next descriptor */
+ __le16 count;
+ __le16 status;
+ __le32 pbuf; /* physical address of data buffer */
+ __le32 next; /* physical address of next descriptor */
/* driver book keeping */
char *buf; /* virtual address of data buffer */
static unsigned int free_tbuf_count(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);
static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
static void get_signals(struct slgt_info *info);
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_active)
tx_start(info);
+ else
+ tdma_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
int rc;
unsigned long flags;
+ if (!try_module_get(THIS_MODULE))
+ return -EBUSY;
+
DBGINFO(("%s hdlcdev_open\n", dev->name));
/* generic HDLC layer open processing */
info->netcount=0;
spin_unlock_irqrestore(&info->netlock, flags);
+ module_put(THIS_MODULE);
return 0;
}
tty_wakeup(tty);
}
-static void dsr_change(struct slgt_info *info)
+static void dsr_change(struct slgt_info *info, unsigned short status)
{
- get_signals(info);
+ if (status & BIT3) {
+ info->signals |= SerialSignal_DSR;
+ info->input_signal_events.dsr_up++;
+ } else {
+ info->signals &= ~SerialSignal_DSR;
+ info->input_signal_events.dsr_down++;
+ }
DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
slgt_irq_off(info, IRQ_DSR);
return;
}
info->icount.dsr++;
- if (info->signals & SerialSignal_DSR)
- info->input_signal_events.dsr_up++;
- else
- info->input_signal_events.dsr_down++;
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
info->pending_bh |= BH_STATUS;
}
-static void cts_change(struct slgt_info *info)
+static void cts_change(struct slgt_info *info, unsigned short status)
{
- get_signals(info);
+ if (status & BIT2) {
+ info->signals |= SerialSignal_CTS;
+ info->input_signal_events.cts_up++;
+ } else {
+ info->signals &= ~SerialSignal_CTS;
+ info->input_signal_events.cts_down++;
+ }
DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
slgt_irq_off(info, IRQ_CTS);
return;
}
info->icount.cts++;
- if (info->signals & SerialSignal_CTS)
- info->input_signal_events.cts_up++;
- else
- info->input_signal_events.cts_down++;
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
info->pending_bh |= BH_STATUS;
}
}
-static void dcd_change(struct slgt_info *info)
+static void dcd_change(struct slgt_info *info, unsigned short status)
{
- get_signals(info);
+ if (status & BIT1) {
+ info->signals |= SerialSignal_DCD;
+ info->input_signal_events.dcd_up++;
+ } else {
+ info->signals &= ~SerialSignal_DCD;
+ info->input_signal_events.dcd_down++;
+ }
DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
slgt_irq_off(info, IRQ_DCD);
return;
}
info->icount.dcd++;
- if (info->signals & SerialSignal_DCD) {
- info->input_signal_events.dcd_up++;
- } else {
- info->input_signal_events.dcd_down++;
- }
#if SYNCLINK_GENERIC_HDLC
if (info->netcount) {
if (info->signals & SerialSignal_DCD)
}
}
-static void ri_change(struct slgt_info *info)
+static void ri_change(struct slgt_info *info, unsigned short status)
{
- get_signals(info);
+ if (status & BIT0) {
+ info->signals |= SerialSignal_RI;
+ info->input_signal_events.ri_up++;
+ } else {
+ info->signals &= ~SerialSignal_RI;
+ info->input_signal_events.ri_down++;
+ }
DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
slgt_irq_off(info, IRQ_RI);
return;
}
- info->icount.dcd++;
- if (info->signals & SerialSignal_RI) {
- info->input_signal_events.ri_up++;
- } else {
- info->input_signal_events.ri_down++;
- }
+ info->icount.rng++;
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
info->pending_bh |= BH_STATUS;
}
if (status & IRQ_DSR)
- dsr_change(info);
+ dsr_change(info, status);
if (status & IRQ_CTS)
- cts_change(info);
+ cts_change(info, status);
if (status & IRQ_DCD)
- dcd_change(info);
+ dcd_change(info, status);
if (status & IRQ_RI)
- ri_change(info);
+ ri_change(info, status);
}
static void isr_rdma(struct slgt_info *info)
slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
/* clear tx idle and underrun status bits */
wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
-
- if (!(rd_reg32(info, TDCSR) & BIT0)) {
- /* tx DMA stopped, restart tx DMA */
- tdma_reset(info);
- /* set 1st descriptor address */
- wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
- switch(info->params.mode) {
- case MGSL_MODE_RAW:
- case MGSL_MODE_MONOSYNC:
- case MGSL_MODE_BISYNC:
- wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
- break;
- default:
- wr_reg32(info, TDCSR, BIT0); /* DMA enable */
- }
- }
-
if (info->params.mode == MGSL_MODE_HDLC)
mod_timer(&info->tx_timer, jiffies +
msecs_to_jiffies(5000));
} else {
- tdma_reset(info);
- /* set 1st descriptor address */
- wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
-
slgt_irq_off(info, IRQ_TXDATA);
slgt_irq_on(info, IRQ_TXIDLE);
/* clear tx idle status bit */
wr_reg16(info, SSR, IRQ_TXIDLE);
-
- /* enable tx DMA */
- wr_reg32(info, TDCSR, BIT0);
}
-
+ tdma_start(info);
info->tx_active = 1;
}
}
+/*
+ * start transmit DMA if inactive and there are unsent buffers
+ */
+static void tdma_start(struct slgt_info *info)
+{
+ unsigned int i;
+
+ if (rd_reg32(info, TDCSR) & BIT0)
+ return;
+
+ /* transmit DMA inactive, check for unsent buffers */
+ i = info->tbuf_start;
+ while (!desc_count(info->tbufs[i])) {
+ if (++i == info->tbuf_count)
+ i = 0;
+ if (i == info->tbuf_current)
+ return;
+ }
+ info->tbuf_start = i;
+
+ /* there are unsent buffers, start transmit DMA */
+
+ /* reset needed if previous error condition */
+ tdma_reset(info);
+
+ /* set 1st descriptor address */
+ wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
+ switch(info->params.mode) {
+ case MGSL_MODE_RAW:
+ case MGSL_MODE_MONOSYNC:
+ case MGSL_MODE_BISYNC:
+ wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
+ break;
+ default:
+ wr_reg32(info, TDCSR, BIT0); /* DMA enable */
+ }
+}
+
static void tx_stop(struct slgt_info *info)
{
unsigned short val;
i=0;
} while (i != info->tbuf_current);
- /* last buffer with zero count may be in use, assume it is */
- if (count)
+ /* if tx DMA active, last zero count buffer is in use */
+ if (count && (rd_reg32(info, TDCSR) & BIT0))
--count;
return count;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff