mmc: don't support write & erase for SPL builds

For SPL builds this is just dead code since we'll only need to read.
Eliminating it results in a significant size reduction for the SPL
binary, which may be critical for certain platforms where the binary
size is highly constrained.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Acked-by: Pantelis Antoniou <panto@antoniou-consulting.com>

drivers/mmc/Makefile

@@ -34,6 +34,8 @@ COBJS-$(CONFIG_EXYNOS_DWMMC) += exynos_dw_mmc.o
 COBJS-$(CONFIG_ZYNQ_SDHCI) += zynq_sdhci.o
 ifdef CONFIG_SPL_BUILD
 COBJS-$(CONFIG_SPL_MMC_BOOT) += fsl_esdhc_spl.o
+else
+COBJS-$(CONFIG_GENERIC_MMC) += mmc_write.o
 endif
 
 COBJS	:= $(COBJS-y)

drivers/mmc/mmc.c

@@ -15,6 +15,7 @@
 #include <malloc.h>
 #include <linux/list.h>
 #include <div64.h>
+#include "mmc_private.h"
 
 /* Set block count limit because of 16 bit register limit on some hardware*/
 #ifndef CONFIG_SYS_MMC_MAX_BLK_COUNT
@@ -52,8 +53,7 @@ int __board_mmc_getcd(struct mmc *mmc) {
 int board_mmc_getcd(struct mmc *mmc)__attribute__((weak,
 	alias("__board_mmc_getcd")));
 
-static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
-			struct mmc_data *data)
+int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 {
 	int ret;
 
@@ -111,7 +111,7 @@ static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
 	return ret;
 }
 
-static int mmc_send_status(struct mmc *mmc, int timeout)
+int mmc_send_status(struct mmc *mmc, int timeout)
 {
 	struct mmc_cmd cmd;
 	int err, retries = 5;
@@ -159,7 +159,7 @@ static int mmc_send_status(struct mmc *mmc, int timeout)
 	return 0;
 }
 
-static int mmc_set_blocklen(struct mmc *mmc, int len)
+int mmc_set_blocklen(struct mmc *mmc, int len)
 {
 	struct mmc_cmd cmd;
 
@@ -189,184 +189,6 @@ struct mmc *find_mmc_device(int dev_num)
 	return NULL;
 }
 
-static ulong mmc_erase_t(struct mmc *mmc, ulong start, lbaint_t blkcnt)
-{
-	struct mmc_cmd cmd;
-	ulong end;
-	int err, start_cmd, end_cmd;
-
-	if (mmc->high_capacity)
-		end = start + blkcnt - 1;
-	else {
-		end = (start + blkcnt - 1) * mmc->write_bl_len;
-		start *= mmc->write_bl_len;
-	}
-
-	if (IS_SD(mmc)) {
-		start_cmd = SD_CMD_ERASE_WR_BLK_START;
-		end_cmd = SD_CMD_ERASE_WR_BLK_END;
-	} else {
-		start_cmd = MMC_CMD_ERASE_GROUP_START;
-		end_cmd = MMC_CMD_ERASE_GROUP_END;
-	}
-
-	cmd.cmdidx = start_cmd;
-	cmd.cmdarg = start;
-	cmd.resp_type = MMC_RSP_R1;
-
-	err = mmc_send_cmd(mmc, &cmd, NULL);
-	if (err)
-		goto err_out;
-
-	cmd.cmdidx = end_cmd;
-	cmd.cmdarg = end;
-
-	err = mmc_send_cmd(mmc, &cmd, NULL);
-	if (err)
-		goto err_out;
-
-	cmd.cmdidx = MMC_CMD_ERASE;
-	cmd.cmdarg = SECURE_ERASE;
-	cmd.resp_type = MMC_RSP_R1b;
-
-	err = mmc_send_cmd(mmc, &cmd, NULL);
-	if (err)
-		goto err_out;
-
-	return 0;
-
-err_out:
-#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
-	puts("mmc erase failed\n");
-#endif
-	return err;
-}
-
-static unsigned long
-mmc_berase(int dev_num, lbaint_t start, lbaint_t blkcnt)
-{
-	int err = 0;
-	struct mmc *mmc = find_mmc_device(dev_num);
-	lbaint_t blk = 0, blk_r = 0;
-	int timeout = 1000;
-
-	if (!mmc)
-		return -1;
-
-#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
-	if ((start % mmc->erase_grp_size) || (blkcnt % mmc->erase_grp_size))
-		printf("\n\nCaution! Your devices Erase group is 0x%x\n"
-		       "The erase range would be change to "
-		       "0x" LBAF "~0x" LBAF "\n\n",
-		       mmc->erase_grp_size, start & ~(mmc->erase_grp_size - 1),
-		       ((start + blkcnt + mmc->erase_grp_size)
-		       & ~(mmc->erase_grp_size - 1)) - 1);
-#endif
-
-	while (blk < blkcnt) {
-		blk_r = ((blkcnt - blk) > mmc->erase_grp_size) ?
-			mmc->erase_grp_size : (blkcnt - blk);
-		err = mmc_erase_t(mmc, start + blk, blk_r);
-		if (err)
-			break;
-
-		blk += blk_r;
-
-		/* Waiting for the ready status */
-		if (mmc_send_status(mmc, timeout))
-			return 0;
-	}
-
-	return blk;
-}
-
-static ulong
-mmc_write_blocks(struct mmc *mmc, lbaint_t start, lbaint_t blkcnt, const void*src)
-{
-	struct mmc_cmd cmd;
-	struct mmc_data data;
-	int timeout = 1000;
-
-	if ((start + blkcnt) > mmc->block_dev.lba) {
-#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
-		printf("MMC: block number 0x" LBAF " exceeds max(0x" LBAF ")\n",
-			start + blkcnt, mmc->block_dev.lba);
-#endif
-		return 0;
-	}
-
-	if (blkcnt == 0)
-		return 0;
-	else if (blkcnt == 1)
-		cmd.cmdidx = MMC_CMD_WRITE_SINGLE_BLOCK;
-	else
-		cmd.cmdidx = MMC_CMD_WRITE_MULTIPLE_BLOCK;
-
-	if (mmc->high_capacity)
-		cmd.cmdarg = start;
-	else
-		cmd.cmdarg = start * mmc->write_bl_len;
-
-	cmd.resp_type = MMC_RSP_R1;
-
-	data.src = src;
-	data.blocks = blkcnt;
-	data.blocksize = mmc->write_bl_len;
-	data.flags = MMC_DATA_WRITE;
-
-	if (mmc_send_cmd(mmc, &cmd, &data)) {
-#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
-		printf("mmc write failed\n");
-#endif
-		return 0;
-	}
-
-	/* SPI multiblock writes terminate using a special
-	 * token, not a STOP_TRANSMISSION request.
-	 */
-	if (!mmc_host_is_spi(mmc) && blkcnt > 1) {
-		cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
-		cmd.cmdarg = 0;
-		cmd.resp_type = MMC_RSP_R1b;
-		if (mmc_send_cmd(mmc, &cmd, NULL)) {
-#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
-			printf("mmc fail to send stop cmd\n");
-#endif
-			return 0;
-		}
-	}
-
-	/* Waiting for the ready status */
-	if (mmc_send_status(mmc, timeout))
-		return 0;
-
-	return blkcnt;
-}
-
-static ulong
-mmc_bwrite(int dev_num, lbaint_t start, lbaint_t blkcnt, const void*src)
-{
-	lbaint_t cur, blocks_todo = blkcnt;
-
-	struct mmc *mmc = find_mmc_device(dev_num);
-	if (!mmc)
-		return 0;
-
-	if (mmc_set_blocklen(mmc, mmc->write_bl_len))
-		return 0;
-
-	do {
-		cur = (blocks_todo > mmc->b_max) ?  mmc->b_max : blocks_todo;
-		if(mmc_write_blocks(mmc, start, cur, src) != cur)
-			return 0;
-		blocks_todo -= cur;
-		start += cur;
-		src += cur * mmc->write_bl_len;
-	} while (blocks_todo > 0);
-
-	return blkcnt;
-}
-
 static int mmc_read_blocks(struct mmc *mmc, void *dst, lbaint_t start,
 			   lbaint_t blkcnt)
 {

drivers/mmc/mmc_private.h

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2008,2010 Freescale Semiconductor, Inc
+ * Andy Fleming
+ *
+ * Based (loosely) on the Linux code
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _MMC_PRIVATE_H_
+#define _MMC_PRIVATE_H_
+
+#include <mmc.h>
+
+extern int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
+			struct mmc_data *data);
+extern int mmc_send_status(struct mmc *mmc, int timeout);
+extern int mmc_set_blocklen(struct mmc *mmc, int len);
+
+#ifndef CONFIG_SPL_BUILD
+
+extern unsigned long mmc_berase(int dev_num, lbaint_t start, lbaint_t blkcnt);
+
+extern ulong mmc_bwrite(int dev_num, lbaint_t start, lbaint_t blkcnt,
+		const void *src);
+
+#else /* CONFIG_SPL_BUILD */
+
+/* SPL will never write or erase, declare dummies to reduce code size. */
+
+static inline unsigned long mmc_berase(int dev_num, lbaint_t start,
+		lbaint_t blkcnt)
+{
+	return 0;
+}
+
+static inline ulong mmc_bwrite(int dev_num, lbaint_t start, lbaint_t blkcnt,
+		const void *src)
+{
+	return 0;
+}
+
+#endif /* CONFIG_SPL_BUILD */
+
+#endif /* _MMC_PRIVATE_H_ */

drivers/mmc/mmc_write.c

@@ -0,0 +1,179 @@
+/*
+ * Copyright 2008, Freescale Semiconductor, Inc
+ * Andy Fleming
+ *
+ * Based vaguely on the Linux code
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+#include <common.h>
+#include <part.h>
+#include "mmc_private.h"
+
+static ulong mmc_erase_t(struct mmc *mmc, ulong start, lbaint_t blkcnt)
+{
+	struct mmc_cmd cmd;
+	ulong end;
+	int err, start_cmd, end_cmd;
+
+	if (mmc->high_capacity) {
+		end = start + blkcnt - 1;
+	} else {
+		end = (start + blkcnt - 1) * mmc->write_bl_len;
+		start *= mmc->write_bl_len;
+	}
+
+	if (IS_SD(mmc)) {
+		start_cmd = SD_CMD_ERASE_WR_BLK_START;
+		end_cmd = SD_CMD_ERASE_WR_BLK_END;
+	} else {
+		start_cmd = MMC_CMD_ERASE_GROUP_START;
+		end_cmd = MMC_CMD_ERASE_GROUP_END;
+	}
+
+	cmd.cmdidx = start_cmd;
+	cmd.cmdarg = start;
+	cmd.resp_type = MMC_RSP_R1;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+	if (err)
+		goto err_out;
+
+	cmd.cmdidx = end_cmd;
+	cmd.cmdarg = end;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+	if (err)
+		goto err_out;
+
+	cmd.cmdidx = MMC_CMD_ERASE;
+	cmd.cmdarg = SECURE_ERASE;
+	cmd.resp_type = MMC_RSP_R1b;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+	if (err)
+		goto err_out;
+
+	return 0;
+
+err_out:
+	puts("mmc erase failed\n");
+	return err;
+}
+
+unsigned long mmc_berase(int dev_num, lbaint_t start, lbaint_t blkcnt)
+{
+	int err = 0;
+	struct mmc *mmc = find_mmc_device(dev_num);
+	lbaint_t blk = 0, blk_r = 0;
+	int timeout = 1000;
+
+	if (!mmc)
+		return -1;
+
+	if ((start % mmc->erase_grp_size) || (blkcnt % mmc->erase_grp_size))
+		printf("\n\nCaution! Your devices Erase group is 0x%x\n"
+		       "The erase range would be change to "
+		       "0x" LBAF "~0x" LBAF "\n\n",
+		       mmc->erase_grp_size, start & ~(mmc->erase_grp_size - 1),
+		       ((start + blkcnt + mmc->erase_grp_size)
+		       & ~(mmc->erase_grp_size - 1)) - 1);
+
+	while (blk < blkcnt) {
+		blk_r = ((blkcnt - blk) > mmc->erase_grp_size) ?
+			mmc->erase_grp_size : (blkcnt - blk);
+		err = mmc_erase_t(mmc, start + blk, blk_r);
+		if (err)
+			break;
+
+		blk += blk_r;
+
+		/* Waiting for the ready status */
+		if (mmc_send_status(mmc, timeout))
+			return 0;
+	}
+
+	return blk;
+}
+
+static ulong mmc_write_blocks(struct mmc *mmc, lbaint_t start,
+		lbaint_t blkcnt, const void *src)
+{
+	struct mmc_cmd cmd;
+	struct mmc_data data;
+	int timeout = 1000;
+
+	if ((start + blkcnt) > mmc->block_dev.lba) {
+		printf("MMC: block number 0x" LBAF " exceeds max(0x" LBAF ")\n",
+		       start + blkcnt, mmc->block_dev.lba);
+		return 0;
+	}
+
+	if (blkcnt == 0)
+		return 0;
+	else if (blkcnt == 1)
+		cmd.cmdidx = MMC_CMD_WRITE_SINGLE_BLOCK;
+	else
+		cmd.cmdidx = MMC_CMD_WRITE_MULTIPLE_BLOCK;
+
+	if (mmc->high_capacity)
+		cmd.cmdarg = start;
+	else
+		cmd.cmdarg = start * mmc->write_bl_len;
+
+	cmd.resp_type = MMC_RSP_R1;
+
+	data.src = src;
+	data.blocks = blkcnt;
+	data.blocksize = mmc->write_bl_len;
+	data.flags = MMC_DATA_WRITE;
+
+	if (mmc_send_cmd(mmc, &cmd, &data)) {
+		printf("mmc write failed\n");
+		return 0;
+	}
+
+	/* SPI multiblock writes terminate using a special
+	 * token, not a STOP_TRANSMISSION request.
+	 */
+	if (!mmc_host_is_spi(mmc) && blkcnt > 1) {
+		cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
+		cmd.cmdarg = 0;
+		cmd.resp_type = MMC_RSP_R1b;
+		if (mmc_send_cmd(mmc, &cmd, NULL)) {
+			printf("mmc fail to send stop cmd\n");
+			return 0;
+		}
+	}
+
+	/* Waiting for the ready status */
+	if (mmc_send_status(mmc, timeout))
+		return 0;
+
+	return blkcnt;
+}
+
+ulong mmc_bwrite(int dev_num, lbaint_t start, lbaint_t blkcnt, const void *src)
+{
+	lbaint_t cur, blocks_todo = blkcnt;
+
+	struct mmc *mmc = find_mmc_device(dev_num);
+	if (!mmc)
+		return 0;
+
+	if (mmc_set_blocklen(mmc, mmc->write_bl_len))
+		return 0;
+
+	do {
+		cur = (blocks_todo > mmc->b_max) ?  mmc->b_max : blocks_todo;
+		if (mmc_write_blocks(mmc, start, cur, src) != cur)
+			return 0;
+		blocks_todo -= cur;
+		start += cur;
+		src += cur * mmc->write_bl_len;
+	} while (blocks_todo > 0);
+
+	return blkcnt;
+}