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Sansa AMS: Disable DMA clocks when not in use

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Add dma_retain() and dma_release() to reference count the users

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19344 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Rafaël Carré 2008-12-04 22:54:06 +00:00
parent 3e4f3fe70e
commit e97191faa7
4 changed files with 30 additions and 3 deletions
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4
firmware/target/arm/as3525/ata_sd_as3525.c
View file

@ -568,6 +568,8 @@ static int sd_transfer_sectors(IF_MV2(int drive,) unsigned long start,
goto sd_transfer_error;
}
dma_retain();
while(count)
{
/* 128 * 512 = 2^16, and doesn't fit in the 16 bits of DATA_LENGTH
@ -628,6 +630,8 @@ static int sd_transfer_sectors(IF_MV2(int drive,) unsigned long start,
while (1)
{
dma_release();
#ifndef BOOTLOADER
sd_enable(false);
#endif

22
firmware/target/arm/as3525/dma-pl081.c
View file

@ -26,6 +26,7 @@
#include "panic.h"
#include "kernel.h"
static int dma_used = 0;
static struct wakeup transfer_completion_signal[2]; /* 2 channels */
static void (*dma_callback[2])(void); /* 2 channels */
@ -34,11 +35,26 @@ inline void dma_wait_transfer(int channel)
wakeup_wait(&transfer_completion_signal[channel], TIMEOUT_BLOCK);
}
void dma_retain(void)
{
if(++dma_used == 1)
{
CGU_PERI |= CGU_DMA_CLOCK_ENABLE;
DMAC_CONFIGURATION |= (1<<0);
}
}
void dma_release(void)
{
if(--dma_used == 0)
{
DMAC_CONFIGURATION &= ~(1<<0);
CGU_PERI &= ~CGU_DMA_CLOCK_ENABLE;
}
}
void dma_init(void)
{
/* Enable DMA controller */
CGU_PERI |= CGU_DMA_CLOCK_ENABLE;
DMAC_CONFIGURATION |= (1<<0); /* TODO: disable controller when not used */
DMAC_SYNC = 0;
VIC_INT_ENABLE |= INTERRUPT_DMAC;

3
firmware/target/arm/as3525/dma-target.h
View file

@ -37,3 +37,6 @@ void dma_enable_channel(int channel, void *src, void *dst, int peri,
size_t size, int nwords, void (*callback)(void));
inline void dma_disable_channel(int channel);
inline void dma_wait_transfer(int channel);
void dma_retain(void);
void dma_release(void);

4
firmware/target/arm/as3525/pcm-as3525.c
View file

@ -94,6 +94,8 @@ void pcm_play_dma_start(const void *addr, size_t size)
dma_size = size;
dma_start_addr = (unsigned char*)addr;
dma_retain();
play_start_pcm();
}
@ -102,6 +104,8 @@ void pcm_play_dma_stop(void)
dma_disable_channel(1);
dma_size = 0;
dma_release();
CGU_PERI &= ~CGU_I2SOUT_APB_CLOCK_ENABLE;
CGU_AUDIO &= ~(1<<11);
}