From: Matt Waddel matt.waddel@linaro.org
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 --- 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 6805b33..d69eaa1 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;