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imx233: fix dma for stmp3600 and stmp3700, improve support

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Add finer granularity to start command: now commands can be
prepared, schedule and semaphore increased independently.

Change-Id: Ib1ed1f20f4b46dc61b6dbab6ddec8b54e3d832b9
This commit is contained in:
Amaury Pouly 2013-06-17 00:16:19 +02:00
parent bdc572b8a1
commit e671472c3f
2 changed files with 69 additions and 12 deletions
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8
firmware/target/arm/imx233/dma-imx233.h
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@ -37,8 +37,12 @@
#define APB_IS_APBX_CHANNEL(x) ((x) & 0x10)
#define APB_GET_DMA_CHANNEL(x) ((x) & 0xf)
#if IMX233_SUBTARGET >= 3700
// NOTE: although undocumented, the iMX233 channel 0 is actually the LCDIF one
#define APB_LCDIF APBH_DMA_CHANNEL(0)
#else
#define APB_LCDIF APBX_DMA_CHANNEL(4)
#endif
#define APB_SSP(ssp) APBH_DMA_CHANNEL(ssp)
#define APB_GPMI(dev) APBH_DMA_CHANNEL(4 + (dev))
@ -151,6 +155,10 @@ void imx233_dma_enable_channel_interrupt(unsigned chan, bool enable);
void imx233_dma_clear_channel_interrupt(unsigned chan);
bool imx233_dma_is_channel_error_irq(unsigned chan);
/* assume no command is in progress */
void imx233_dma_prepare_command(unsigned chan, struct apb_dma_command_t *cmd);
void imx233_dma_set_next_command(unsigned chan, struct apb_dma_command_t *cmd);
void imx233_dma_inc_sema(unsigned chan, unsigned amount);
/* wrapper around prepare_command, set_next_command, inc_sema(1) */
void imx233_dma_start_command(unsigned chan, struct apb_dma_command_t *cmd);
/* return value of the semaphore */
int imx233_dma_wait_completion(unsigned chan, unsigned tmo);