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imx6ull-flash: add function for checking DMA descriptor chain #317

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imx6ull-flash: add function for checking DMA descriptor chain #317

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45 changes: 45 additions & 0 deletions storage/imx6ull-flash/flashdrv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@
* %LICENSE%
*/

#include <assert.h>
#include <errno.h>
#include <unistd.h>
#include <stdint.h>
Expand Down Expand Up @@ -459,6 +460,32 @@ void flashdrv_dmadestroy(flashdrv_dma_t *dma)
}


static dma_t *dma_verify(dma_t *desc)
{
/* DMA transfer/sense, check the buffer */
if ((desc->flags & 3) && (desc->buffer == 0)) {
printf("imx6ull-flash: detected NULL buffer for DMA transfer!\n");
}

/* Return next descriptor */
return (desc->flags & dma_chain) ? (dma_t *)((uintptr_t)desc + (desc->next - (uint32_t)va2pa(desc))) : NULL;
}


static int flashdrv_dmaverify(flashdrv_dma_t *dma)
{
dma_t *desc = dma->first;
int n = 0;

while (desc != NULL) {
desc = dma_verify(desc);
n++;
}

return n;
}


int flashdrv_wait4ready(flashdrv_dma_t *dma, int chip, int err)
{
void *next = dma->last, *prev = dma->last;
Expand Down Expand Up @@ -652,6 +679,8 @@ int flashdrv_reset(flashdrv_dma_t *dma)
flashdrv_issue(dma, flash_reset, chip, NULL, 0, NULL, NULL);
flashdrv_finish(dma);

assert(flashdrv_dmaverify(dma) == 2);

mutexLock(flashdrv_common.mutex);
flashdrv_common.result = 1;
dma_run((dma_t *)dma->first, channel);
Expand Down Expand Up @@ -684,6 +713,8 @@ int flashdrv_readid(flashdrv_dma_t *dma, flash_id_t *flash_id)
flashdrv_wait4ready(dma, chip, EOK);
flashdrv_finish(dma);

assert(flashdrv_dmaverify(dma) == 10);

mutexLock(flashdrv_common.mutex);
flashdrv_common.result = 1;
dma_run((dma_t *)dma->first, channel);
Expand Down Expand Up @@ -728,6 +759,8 @@ int flashdrv_write(flashdrv_dma_t *dma, uint32_t paddr, void *data, char *aux)
flashdrv_readcompare(dma, chip, 0x3, 0, -1);
flashdrv_finish(dma);

assert(flashdrv_dmaverify(dma) == 11);

mutexLock(flashdrv_common.mutex);

if (data == NULL) {
Expand Down Expand Up @@ -794,6 +827,8 @@ int flashdrv_read(flashdrv_dma_t *dma, uint32_t paddr, void *data, flashdrv_meta
flashdrv_disablebch(dma, chip);
flashdrv_finish(dma);

assert(flashdrv_dmaverify(dma) == 9);

mutexLock(flashdrv_common.mutex);
flashdrv_common.result = 1;
flashdrv_common.bch_done = 0;
Expand Down Expand Up @@ -827,6 +862,8 @@ int flashdrv_erase(flashdrv_dma_t *dma, uint32_t paddr)
flashdrv_readcompare(dma, chip, 0x1, 0, -1);
flashdrv_finish(dma);

assert(flashdrv_dmaverify(dma) == 10);

mutexLock(flashdrv_common.mutex);
flashdrv_common.result = 1;
dma_run((dma_t *)dma->first, channel);
Expand Down Expand Up @@ -859,6 +896,8 @@ int flashdrv_writeraw(flashdrv_dma_t *dma, uint32_t paddr, void *data, int sz)
flashdrv_readcompare(dma, 0, 0x3, 0, -1);
flashdrv_finish(dma);

assert(flashdrv_dmaverify(dma) == 11);

mutexLock(flashdrv_common.mutex);
flashdrv_common.result = 1;
dma_run((dma_t *)dma->first, channel);
Expand Down Expand Up @@ -892,6 +931,8 @@ int flashdrv_readraw(flashdrv_dma_t *dma, uint32_t paddr, void *data, int sz)
flashdrv_wait4ready(dma, chip, EOK);
flashdrv_finish(dma);

assert(flashdrv_dmaverify(dma) == 11);

mutexLock(flashdrv_common.mutex);
flashdrv_common.result = 1;
dma_run((dma_t *)dma->first, channel);
Expand Down Expand Up @@ -930,6 +971,8 @@ int flashdrv_isbad(flashdrv_dma_t *dma, uint32_t paddr)
flashdrv_wait4ready(dma, chip, EOK);
flashdrv_finish(dma);

assert(flashdrv_dmaverify(dma) == 11);

mutexLock(flashdrv_common.mutex);
flashdrv_common.result = 1;
dma_run((dma_t *)dma->first, channel);
Expand Down Expand Up @@ -971,6 +1014,8 @@ int flashdrv_markbad(flashdrv_dma_t *dma, uint32_t paddr)
flashdrv_readcompare(dma, 0, 0x3, 0, -1);
flashdrv_finish(dma);

assert(flashdrv_dmaverify(dma) == 11);

mutexLock(flashdrv_common.mutex);

memset(data, 0xff, flashdrv_common.info.writesz + flashdrv_common.info.metasz);
Expand Down