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mmc: Tinification of the mmc code

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Add new configuration option CONFIG_MMC_TINY which strips away all
memory allocation within the MMC code and code for handling multiple
cards. This allows extremely space-constrained SPL code use the MMC
framework.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Marek Vasut
2016-12-01 02:06:33 +01:00
committed by Jaehoon Chung
parent ce9eca9438
commit b5b838f1a7
5 changed files with 83 additions and 2 deletions
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32
drivers/mmc/mmc_legacy.c
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@@ -13,6 +13,7 @@
static struct list_head mmc_devices;
static int cur_dev_num = -1;
#if !CONFIG_IS_ENABLED(MMC_TINY)
struct mmc *find_mmc_device(int dev_num)
{
struct mmc *m;
@@ -62,6 +63,7 @@ void mmc_do_preinit(void)
mmc_start_init(m);
}
}
#endif
void mmc_list_init(void)
{
@@ -109,6 +111,35 @@ void print_mmc_devices(char separator)
void print_mmc_devices(char separator) { }
#endif
#if CONFIG_IS_ENABLED(MMC_TINY)
static struct mmc mmc_static = {
.dsr_imp = 0,
.dsr = 0xffffffff,
.block_dev = {
.if_type = IF_TYPE_MMC,
.removable = 1,
.devnum = 0,
.block_read = mmc_bread,
.block_write = mmc_bwrite,
.block_erase = mmc_berase,
.part_type = 0,
},
};
struct mmc *mmc_create(const struct mmc_config *cfg, void *priv)
{
struct mmc *mmc = &mmc_static;
mmc->cfg = cfg;
mmc->priv = priv;
return mmc;
}
void mmc_destroy(struct mmc *mmc)
{
}
#else
struct mmc *mmc_create(const struct mmc_config *cfg, void *priv)
{
struct blk_desc *bdesc;
@@ -157,6 +188,7 @@ void mmc_destroy(struct mmc *mmc)
/* only freeing memory for now */
free(mmc);
}
#endif
static int mmc_select_hwpartp(struct blk_desc *desc, int hwpart)
{