qi-hardware/ben-blinkenlights
1
0
Fork 0
mirror of git://projects.qi-hardware.com/ben-blinkenlights.git synced 2024-06-28 22:11:40 +03:00
Code

ubb-patgen/ubb-patgen.c: use symbolic bit/field definitions for DMA

Browse Source
This commit is contained in:
Werner Almesberger 2013-01-20 19:16:36 -03:00
parent 5efafd6fcc
commit 5025f360cc
1 changed files with 12 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
ubb-patgen/ubb-patgen.c
View File

@ -287,7 +287,9 @@ static uint32_t old_dmac;
static void dma_stop(void)
{
DCS(DMA) = (1 << 3) | (1 << 2); /* halt DMA channel */
DCS(DMA) =
DCS_TT | /* Transfer terminated */
DCS_HLT; /* DMA halt */
DCS(DMA) = 0; /* reset DMA channel */
}
@ -296,13 +298,14 @@ static void dma_init(void)
{
old_dmac = DMAC;
DMAC = 1; /* activate the DMA controller (in case it's off) */
DMAC = DMAC_DMAE; /* activate the DMA controller (in case it's off) */
dma_stop();
DCM(DMA) =
(1 << 23) | /* source address increment */
(4 << 8); /* transfer size is 32 bytes */
DRT(DMA) = 26; /* MSC transmit-fifo-empty transfer request */
DCM_SAI | /* source address increment */
(DCM_TSZ_32BYTE << DCM_TSZ_SHIFT);
/* transfer size is 32 bytes */
DRT(DMA) = DRT_MSC_TX; /* MSC transmit-fifo-empty transfer request */
}
@ -317,7 +320,7 @@ static void dma_setup(unsigned long buf, int nibbles)
{
assert(!(nibbles & 63));
DCS(DMA) = 1 << 31; /* no-descriptor transfer */
DCS(DMA) = DCS_NDES; /* no-descriptor transfer */
DSA(DMA) = buf; /* source */
DTA(DMA) = REG_PADDR(MSC_TXFIFO); /* MUST set this each time */
DTC(DMA) = nibbles >> 6; /* 32 bytes per transfer */
@ -326,7 +329,7 @@ static void dma_setup(unsigned long buf, int nibbles)
static void wait_dma_done(void)
{
while (!((DCS(DMA) >> 3) & 1)); /* DCS.TT */
while (!(DCS(DMA) & DCS_TT));
}
@ -459,8 +462,8 @@ static void mmc_buffer(const struct mmcclk *clk,
*/
DCS(DMA) =
(1 << 31) | /* no descriptor */
1; /* enable transfer */
DCS_NDES | /* no descriptor */
DCS_CTE; /* enable channel */
unrealtime();