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imx233: add DCP driver (only memcpy implemented), move channel arbiter to kernel-imx233

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Change-Id: I2bc5a49459c354027fc67a880bbf3b87c942bdd0
This commit is contained in:
Amaury Pouly 2012-01-15 01:38:41 +01:00
parent 8cadb587e8
commit 35ba39e57f
8 changed files with 663 additions and 52 deletions
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43
firmware/target/arm/imx233/kernel-imx233.c
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@ -21,6 +21,7 @@
#include "kernel.h"
#include "timrot-imx233.h"
#include "clkctrl-imx233.h"
#include "kernel-imx233.h"
static void tick_timer(void)
{
@ -35,3 +36,45 @@ void tick_start(unsigned int interval_in_ms)
HW_TIMROT_TIMCTRL__SELECT_1KHZ_XTAL, HW_TIMROT_TIMCTRL__PRESCALE_1,
false, &tick_timer);
}
void arbiter_init(struct channel_arbiter_t *a, unsigned count)
{
mutex_init(&a->mutex);
semaphore_init(&a->sema, count, count);
a->free_bm = (1 << count) - 1;
a->count = count;
}
// doesn't check in use !
void arbiter_reserve(struct channel_arbiter_t *a, unsigned channel)
{
// assume semaphore has a free slot immediately
if(semaphore_wait(&a->sema, TIMEOUT_NOBLOCK) != OBJ_WAIT_SUCCEEDED)
panicf("arbiter_reserve failed on semaphore_wait !");
mutex_lock(&a->mutex);
a->free_bm &= ~(1 << channel);
mutex_unlock(&a->mutex);
}
int arbiter_acquire(struct channel_arbiter_t *a, int timeout)
{
int w = semaphore_wait(&a->sema, timeout);
if(w == OBJ_WAIT_TIMEDOUT)
return w;
mutex_lock(&a->mutex);
int chan = find_first_set_bit(a->free_bm);
if(chan >= a->count)
panicf("arbiter_acquire cannot find a free channel !");
a->free_bm &= ~(1 << chan);
mutex_unlock(&a->mutex);
return chan;
}
void arbiter_release(struct channel_arbiter_t *a, int channel)
{
mutex_lock(&a->mutex);
a->free_bm |= 1 << channel;
mutex_unlock(&a->mutex);
semaphore_release(&a->sema);
}