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MMC: Implement generic bounce buffer

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This implements generic bounce buffer at the end of MMC command submission
chain. Therefore if unaligned data are passed, they are copied. This stuff
should be pushed down into the MMC subsystem to squash all places generating
these unaligned data.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Andy Fleming <afleming@gmail.com>
This commit is contained in:
Marek Vasut 2012-03-15 18:41:35 +00:00 committed by Albert ARIBAUD
parent 6b9408edd3
commit 8635ff9e99
1 changed files with 99 additions and 3 deletions
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102
drivers/mmc/mmc.c
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@ -47,10 +47,105 @@ int __board_mmc_getcd(struct mmc *mmc) {
int board_mmc_getcd(struct mmc *mmc)__attribute__((weak,
alias("__board_mmc_getcd")));
#ifdef CONFIG_MMC_BOUNCE_BUFFER
static int mmc_bounce_need_bounce(struct mmc_data *orig)
{
ulong addr, len;
if (orig->flags & MMC_DATA_READ)
addr = (ulong)orig->dest;
else
addr = (ulong)orig->src;
if (addr % ARCH_DMA_MINALIGN) {
debug("MMC: Unaligned data destination address %08lx!\n", addr);
return 1;
}
len = (ulong)(orig->blocksize * orig->blocks);
if (len % ARCH_DMA_MINALIGN) {
debug("MMC: Unaligned data destination length %08lx!\n", len);
return 1;
}
return 0;
}
static int mmc_bounce_buffer_start(struct mmc_data *backup,
struct mmc_data *orig)
{
ulong origlen, len;
void *buffer;
if (!orig)
return 0;
if (!mmc_bounce_need_bounce(orig))
return 0;
memcpy(backup, orig, sizeof(struct mmc_data));
origlen = orig->blocksize * orig->blocks;
len = roundup(origlen, ARCH_DMA_MINALIGN);
buffer = memalign(ARCH_DMA_MINALIGN, len);
if (!buffer) {
puts("MMC: Error allocating MMC bounce buffer!\n");
return 1;
}
if (orig->flags & MMC_DATA_READ) {
orig->dest = buffer;
} else {
memcpy(buffer, orig->src, origlen);
orig->src = buffer;
}
return 0;
}
static void mmc_bounce_buffer_stop(struct mmc_data *backup,
struct mmc_data *orig)
{
ulong len;
if (!orig)
return;
if (!mmc_bounce_need_bounce(backup))
return;
if (backup->flags & MMC_DATA_READ) {
len = backup->blocksize * backup->blocks;
memcpy(backup->dest, orig->dest, len);
free(orig->dest);
orig->dest = backup->dest;
} else {
free((void *)orig->src);
orig->src = backup->src;
}
return;
}
#else
static inline int mmc_bounce_buffer_start(struct mmc_data *backup,
struct mmc_data *orig) { }
static inline void mmc_bounce_buffer_stop(struct mmc_data *backup,
struct mmc_data *orig) { }
#endif
int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
{
#ifdef CONFIG_MMC_TRACE
struct mmc_data backup;
int ret;
memset(&backup, 0, sizeof(backup));
ret = mmc_bounce_buffer_start(&backup, data);
if (ret)
return ret;
#ifdef CONFIG_MMC_TRACE
int i;
u8 *ptr;
@ -99,10 +194,11 @@ int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
printf("\t\tERROR MMC rsp not supported\n");
break;
}
return ret;
#else
return mmc->send_cmd(mmc, cmd, data);
ret = mmc->send_cmd(mmc, cmd, data);
#endif
mmc_bounce_buffer_stop(&backup, data);
return ret;
}
int mmc_send_status(struct mmc *mmc, int timeout)