diff options
| author | Matt Waddel <matt.waddel@linaro.org> | 2011-02-24 19:35:23 -0700 |
|---|---|---|
| committer | John Rigby <john.rigby@linaro.org> | 2011-03-07 12:11:36 -0700 |
| commit | 67afca3749fcd330ab9b8e401c8cc368faa572c0 (patch) | |
| tree | 4e461112cd20e87c113eba194e5d8f5e346a3b10 | |
| parent | 9a4fbadfdacd5ebc526f2e1d68b2e8966d0b2117 (diff) | |
MMC: Max blocks value adjustable
The maximum blocks value was hardcoded to 65535 due to a 16 bit
register length. The value can change for different platforms.
This patch makes the default the current value of 65535, but it
is configurable for other platforms.
Signed-off-by: Matt Waddel <matt.waddel@linaro.org>
| -rw-r--r-- | drivers/mmc/mmc.c | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 6805b33f7..d69eaa19a 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -33,6 +33,11 @@ #include <mmc.h> #include <div64.h> +/* Set block count limit because of 16 bit register limit on some hardware*/ +#ifndef CONFIG_SYS_MMC_MAX_BLK_COUNT +#define CONFIG_SYS_MMC_MAX_BLK_COUNT 65535 +#endif + static struct list_head mmc_devices; static int cur_dev_num = -1; @@ -139,11 +144,8 @@ mmc_bwrite(int dev_num, ulong start, lbaint_t blkcnt, const void*src) return 0; do { - /* - * The 65535 constraint comes from some hardware has - * only 16 bit width block number counter - */ - cur = (blocks_todo > 65535) ? 65535 : blocks_todo; + cur = (blocks_todo > CONFIG_SYS_MMC_MAX_BLK_COUNT) ? + CONFIG_SYS_MMC_MAX_BLK_COUNT : blocks_todo; if(mmc_write_blocks(mmc, start, cur, src) != cur) return 0; blocks_todo -= cur; @@ -215,11 +217,8 @@ static ulong mmc_bread(int dev_num, ulong start, lbaint_t blkcnt, void *dst) return 0; do { - /* - * The 65535 constraint comes from some hardware has - * only 16 bit width block number counter - */ - cur = (blocks_todo > 65535) ? 65535 : blocks_todo; + cur = (blocks_todo > CONFIG_SYS_MMC_MAX_BLK_COUNT) ? + CONFIG_SYS_MMC_MAX_BLK_COUNT : blocks_todo; if(mmc_read_blocks(mmc, dst, start, cur) != cur) return 0; blocks_todo -= cur; |