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| author | Nicolas Ferre <nicolas.ferre@atmel.com> | 2011-04-30 16:57:45 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2011-05-02 15:42:09 +0530 |
| commit | 9b3aa589eaa1366200062ce1f9cc7ddca8d1d578 (patch) | |
| tree | 31237c0bfbea0a79548fd4a3e18e2260f97de6fb /drivers/dma | |
| parent | 364de77831213be20f7f33c39ca1c194593b5c11 (diff) | |
| download | kernel_samsung_smdk4412-9b3aa589eaa1366200062ce1f9cc7ddca8d1d578.zip kernel_samsung_smdk4412-9b3aa589eaa1366200062ce1f9cc7ddca8d1d578.tar.gz kernel_samsung_smdk4412-9b3aa589eaa1366200062ce1f9cc7ddca8d1d578.tar.bz2 | |
dmaengine: at_hdmac: modify way to use interrupts
Now we use Buffer Transfer Completed interrupts. If we
want a chained buffer completed information, we setup the
ATC_IEN bit in CTRLB register in the lli.
This is done by set_desc_eol() function and used by
memcpy/slave_sg functions.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/at_hdmac.c | 4 | ||||
| -rw-r--r-- | drivers/dma/at_hdmac_regs.h | 11 |
2 files changed, 10 insertions, 5 deletions
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index 3d7d705..13050e6 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -464,7 +464,7 @@ static irqreturn_t at_dma_interrupt(int irq, void *dev_id) for (i = 0; i < atdma->dma_common.chancnt; i++) { atchan = &atdma->chan[i]; - if (pending & (AT_DMA_CBTC(i) | AT_DMA_ERR(i))) { + if (pending & (AT_DMA_BTC(i) | AT_DMA_ERR(i))) { if (pending & AT_DMA_ERR(i)) { /* Disable channel on AHB error */ dma_writel(atdma, CHDR, atchan->mask); @@ -549,7 +549,7 @@ atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, } ctrla = ATC_DEFAULT_CTRLA; - ctrlb = ATC_DEFAULT_CTRLB + ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN | ATC_SRC_ADDR_MODE_INCR | ATC_DST_ADDR_MODE_INCR | ATC_FC_MEM2MEM; diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h index 495457e..8303306 100644 --- a/drivers/dma/at_hdmac_regs.h +++ b/drivers/dma/at_hdmac_regs.h @@ -309,8 +309,8 @@ static void atc_setup_irq(struct at_dma_chan *atchan, int on) struct at_dma *atdma = to_at_dma(atchan->chan_common.device); u32 ebci; - /* enable interrupts on buffer chain completion & error */ - ebci = AT_DMA_CBTC(atchan->chan_common.chan_id) + /* enable interrupts on buffer transfer completion & error */ + ebci = AT_DMA_BTC(atchan->chan_common.chan_id) | AT_DMA_ERR(atchan->chan_common.chan_id); if (on) dma_writel(atdma, EBCIER, ebci); @@ -347,7 +347,12 @@ static inline int atc_chan_is_enabled(struct at_dma_chan *atchan) */ static void set_desc_eol(struct at_desc *desc) { - desc->lli.ctrlb |= ATC_SRC_DSCR_DIS | ATC_DST_DSCR_DIS; + u32 ctrlb = desc->lli.ctrlb; + + ctrlb &= ~ATC_IEN; + ctrlb |= ATC_SRC_DSCR_DIS | ATC_DST_DSCR_DIS; + + desc->lli.ctrlb = ctrlb; desc->lli.dscr = 0; } |