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wctc4xxp: Use hardware timer for polling and not kernel timer

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Simplifies the logic when polling is enabled. No need to worry about any system
factors when scheduling the default kernel timer.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Signed-off-by: Russ Meyerriecks <rmeyerriecks@digium.com>
This commit is contained in:
Shaun Ruffell 2014-05-09 13:58:11 -05:00 committed by Russ Meyerriecks
parent 0efce00a09
commit 354d88cd41
1 changed files with 16 additions and 46 deletions
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62
drivers/dahdi/wctc4xxp/base.c
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@ -78,7 +78,7 @@
/* The total number of active channels over which the driver will start polling
* the card every 10 ms. */
#define POLLING_CALL_THRESHOLD 40
#define POLLING_CALL_THRESHOLD 8
#define INVALID 999 /* Used to mark invalid channels, commands, etc.. */
#define MAX_CHANNEL_PACKETS 5
@ -356,7 +356,6 @@ struct wcdte {
#endif
struct timer_list watchdog;
atomic_t open_channels;
struct timer_list polling;
#if HZ > 100
unsigned long jiffies_at_last_poll;
#endif
@ -1792,10 +1791,12 @@ wctc4xxp_setintmask(struct wcdte *wc, unsigned int intmask)
wctc4xxp_setctl(wc, 0x0038, intmask);
}
static const u32 DEFAULT_INTERRUPTS = 0x0001a0c0;
static void
wctc4xxp_enable_interrupts(struct wcdte *wc)
{
wctc4xxp_setintmask(wc, 0x0001a0c0);
wctc4xxp_setintmask(wc, DEFAULT_INTERRUPTS);
}
static void
@ -1810,8 +1811,9 @@ static void
wctc4xxp_enable_polling(struct wcdte *wc)
{
set_bit(DTE_POLLING, &wc->flags);
mod_timer(&wc->polling, jiffies + 1);
wctc4xxp_disable_interrupts(wc);
wctc4xxp_setctl(wc, 0x0058, 0x1000a);
/* Enable the general purpose timer interrupt. */
wctc4xxp_setintmask(wc, (DEFAULT_INTERRUPTS | (1 << 11)) & ~0x41);
}
static int
@ -1857,6 +1859,7 @@ static void
wctc4xxp_disable_polling(struct wcdte *wc)
{
clear_bit(DTE_POLLING, &wc->flags);
wctc4xxp_setctl(wc, 0x0058, 0x0);
wctc4xxp_enable_interrupts(wc);
}
@ -2014,23 +2017,6 @@ wctc4xxp_handle_receive_ring(struct wcdte *wc)
return count;
}
static void
__wctc4xxp_polling(struct wcdte *wc)
{
if (wctc4xxp_handle_receive_ring(wc))
schedule_work(&wc->deferred_work);
}
static void
wctc4xxp_polling(unsigned long data)
{
struct wcdte *wc = (struct wcdte *)data;
__wctc4xxp_polling(wc);
if (test_bit(DTE_POLLING, &wc->flags))
mod_timer(&wc->polling, jiffies + 1);
}
/* Called with a buffer in which to copy a transcoded frame. */
static ssize_t
wctc4xxp_read(struct file *file, char __user *frame, size_t count, loff_t *ppos)
@ -2187,18 +2173,6 @@ wctc4xxp_write(struct file *file, const char __user *frame,
atomic_inc(&cpvt->stats.packets_sent);
wctc4xxp_transmit_cmd(wc, cmd);
if (test_bit(DTE_POLLING, &wc->flags)) {
#if HZ == 100
__wctc4xxp_polling(wc);
#else
if (jiffies != wc->jiffies_at_last_poll) {
wc->jiffies_at_last_poll = jiffies;
__wctc4xxp_polling(wc);
}
#endif
}
return count;
}
@ -2581,7 +2555,9 @@ DAHDI_IRQ_HANDLER(wctc4xxp_interrupt)
u32 reg;
#define TX_COMPLETE_INTERRUPT 0x00000001
#define RX_COMPLETE_INTERRUPT 0x00000040
#define NORMAL_INTERRUPTS (TX_COMPLETE_INTERRUPT | RX_COMPLETE_INTERRUPT)
#define TIMER_INTERRUPT (1<<11)
#define NORMAL_INTERRUPTS (TX_COMPLETE_INTERRUPT | RX_COMPLETE_INTERRUPT | \
TIMER_INTERRUPT)
/* Read and clear interrupts */
ints = __wctc4xxp_getctl(wc, 0x0028);
@ -2601,6 +2577,11 @@ DAHDI_IRQ_HANDLER(wctc4xxp_interrupt)
reg |= RX_COMPLETE_INTERRUPT;
}
if (ints & TIMER_INTERRUPT) {
wctc4xxp_handle_receive_ring(wc);
reg |= TIMER_INTERRUPT;
}
#if DEFERRED_PROCESSING == WORKQUEUE
schedule_work(&wc->deferred_work);
#elif DEFERRED_PROCESSING == INTERRUPT
@ -3556,14 +3537,6 @@ wctc4xxp_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
setup_timer(&wc->watchdog, wctc4xxp_watchdog, (unsigned long)wc);
# endif
# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18)
wc->polling.function = wctc4xxp_polling;
wc->polling.data = (unsigned long)wc;
init_timer(&wc->polling);
# else
setup_timer(&wc->polling, wctc4xxp_polling, (unsigned long)wc);
# endif
/* ------------------------------------------------------------------
* Load the firmware and start the DTE.
* --------------------------------------------------------------- */
@ -3684,9 +3657,6 @@ static void __devexit wctc4xxp_remove_one(struct pci_dev *pdev)
/* This should already be stopped, but it doesn't hurt to make sure. */
clear_bit(DTE_POLLING, &wc->flags);
if (del_timer_sync(&wc->polling))
del_timer_sync(&wc->polling);
wctc4xxp_net_unregister(wc);
/* Stop any DMA */