mmc: Tinification of the mmc code

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>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 6a19bbf..9f8368a 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -30,6 +30,29 @@
 	SZ_16M / 512,	(SZ_16M + SZ_8M) / 512,	SZ_32M / 512,	SZ_64M / 512,
 };
 
+#if CONFIG_IS_ENABLED(MMC_TINY)
+static struct mmc mmc_static;
+struct mmc *find_mmc_device(int dev_num)
+{
+	return &mmc_static;
+}
+
+void mmc_do_preinit(void)
+{
+	struct mmc *m = &mmc_static;
+#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
+	mmc_set_preinit(m, 1);
+#endif
+	if (m->preinit)
+		mmc_start_init(m);
+}
+
+struct blk_desc *mmc_get_blk_desc(struct mmc *mmc)
+{
+	return &mmc->block_dev;
+}
+#endif
+
 #ifndef CONFIG_DM_MMC_OPS
 __weak int board_mmc_getwp(struct mmc *mmc)
 {
@@ -259,7 +282,11 @@
 	if (!mmc)
 		return 0;
 
-	err = blk_dselect_hwpart(block_dev, block_dev->hwpart);
+	if (CONFIG_IS_ENABLED(MMC_TINY))
+		err = mmc_switch_part(mmc, block_dev->hwpart);
+	else
+		err = blk_dselect_hwpart(block_dev, block_dev->hwpart);
+
 	if (err < 0)
 		return 0;
 
@@ -1804,8 +1831,10 @@
 	initialized = 1;
 
 #ifndef CONFIG_BLK
+#if !CONFIG_IS_ENABLED(MMC_TINY)
 	mmc_list_init();
 #endif
+#endif
 	ret = mmc_probe(bis);
 	if (ret)
 		return ret;