qi-hardware/ben-blinkenlights
1
0
Fork 0
mirror of git://projects.qi-hardware.com/ben-blinkenlights.git synced 2024-07-01 02:44:32 +03:00
Code

ubb-patgen/ubb-patgen.c: DMA has mystery glitches. Use PIO for now.

Browse Source
This commit is contained in:
Werner Almesberger 2013-01-14 22:18:46 -03:00
parent 3febc9072a
commit 908b0631d1
1 changed files with 30 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
ubb-patgen/ubb-patgen.c
View File

@ -132,6 +132,8 @@ static int select_freq(struct mmcclk *res, int hz, int rel)
/* ----- DMA the pattern --------------------------------------------------- */
#ifdef USE_DMA
static uint32_t old_dmac;
@ -179,6 +181,15 @@ static void wait_dma_done(void)
while (!((DCS(DMA) >> 3) & 1)); /* DCS.TT */
}
#else /* USE_DMA */
static void dma_init(void) {}
static void dma_cleanup(void) {}
static void dma_setup(unsigned long buf, int nibbles) {}
#endif /* !USE_DMA */
static void wait_response(void)
{
@ -224,7 +235,9 @@ static void mmc_buffer(const struct mmcclk *clk,
MSC_CMDAT =
(2 << 9) | /* 4 bit bus */
#ifdef USE_DMA
(1 << 8) | /* DMA */
#endif
(1 << 4) | /* write */
(1 << 3) | /* with data transfer */
1; /* R1 response */
@ -252,6 +265,8 @@ static void mmc_buffer(const struct mmcclk *clk,
PDFUNS = mask;
#ifdef USE_DMA
/*
* Send the pattern with DMA. Note that we still have to send the first
* pattern, since the static state we begin from may not have been
@ -264,6 +279,17 @@ static void mmc_buffer(const struct mmcclk *clk,
wait_dma_done();
#else /* USE_DMA */
const uint32_t *p;
for (p = (void *) buf; p != (void *) buf+(nibbles >> 1); p++) {
while ((MSC_STAT >> 7) & 1);
MSC_TXFIFO = *p;
}
#endif /* !USE_DMA */
wait_fifo_empty();
wait_shifted(clk);
@ -280,10 +306,14 @@ static void mmc_buffer(const struct mmcclk *clk,
static void send_buffer(const struct mmcclk *clk,
const uint8_t *buf, int nibbles, uint32_t mask)
{
#ifdef USE_DMA
unsigned long phys;
phys = physmem_xlat((void *) buf);
mmc_buffer(clk, buf[0] >> 4, phys, nibbles, mask);
#else
mmc_buffer(clk, buf[0] >> 4, (unsigned long) buf, nibbles, mask);
#endif
}