Adding upstream version 2.8.0+dfsg.upstream/2.8.0+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 858 insertions, 0 deletions

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
new file mode 100644
index 0000000..8e83464
--- /dev/null
+++ b/drivers/mmc/mmc.c
@@ -0,0 +1,858 @@
+/*
+ * Copyright (c) 2018-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* Define a simple and generic interface to access eMMC and SD-card devices. */
+
+#include <assert.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <drivers/delay_timer.h>
+#include <drivers/mmc.h>
+#include <lib/utils.h>
+#include <plat/common/common_def.h>
+
+#define MMC_DEFAULT_MAX_RETRIES		5
+#define SEND_OP_COND_MAX_RETRIES	100
+
+#define MULT_BY_512K_SHIFT		19
+
+static const struct mmc_ops *ops;
+static unsigned int mmc_ocr_value;
+static struct mmc_csd_emmc mmc_csd;
+static struct sd_switch_status sd_switch_func_status;
+static unsigned char mmc_ext_csd[512] __aligned(16);
+static unsigned int mmc_flags;
+static struct mmc_device_info *mmc_dev_info;
+static unsigned int rca;
+static unsigned int scr[2]__aligned(16) = { 0 };
+
+static const unsigned char tran_speed_base[16] = {
+	0, 10, 12, 13, 15, 20, 26, 30, 35, 40, 45, 52, 55, 60, 70, 80
+};
+
+static const unsigned char sd_tran_speed_base[16] = {
+	0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80
+};
+
+static bool is_cmd23_enabled(void)
+{
+	return ((mmc_flags & MMC_FLAG_CMD23) != 0U);
+}
+
+static bool is_sd_cmd6_enabled(void)
+{
+	return ((mmc_flags & MMC_FLAG_SD_CMD6) != 0U);
+}
+
+static int mmc_send_cmd(unsigned int idx, unsigned int arg,
+			unsigned int r_type, unsigned int *r_data)
+{
+	struct mmc_cmd cmd;
+	int ret;
+
+	zeromem(&cmd, sizeof(struct mmc_cmd));
+
+	cmd.cmd_idx = idx;
+	cmd.cmd_arg = arg;
+	cmd.resp_type = r_type;
+
+	ret = ops->send_cmd(&cmd);
+
+	if ((ret == 0) && (r_data != NULL)) {
+		int i;
+
+		for (i = 0; i < 4; i++) {
+			*r_data = cmd.resp_data[i];
+			r_data++;
+		}
+	}
+
+	if (ret != 0) {
+		VERBOSE("Send command %u error: %d\n", idx, ret);
+	}
+
+	return ret;
+}
+
+static int mmc_device_state(void)
+{
+	int retries = MMC_DEFAULT_MAX_RETRIES;
+	unsigned int resp_data[4];
+
+	do {
+		int ret;
+
+		if (retries == 0) {
+			ERROR("CMD13 failed after %d retries\n",
+			      MMC_DEFAULT_MAX_RETRIES);
+			return -EIO;
+		}
+
+		ret = mmc_send_cmd(MMC_CMD(13), rca << RCA_SHIFT_OFFSET,
+				   MMC_RESPONSE_R1, &resp_data[0]);
+		if (ret != 0) {
+			retries--;
+			continue;
+		}
+
+		if ((resp_data[0] & STATUS_SWITCH_ERROR) != 0U) {
+			return -EIO;
+		}
+
+		retries--;
+	} while ((resp_data[0] & STATUS_READY_FOR_DATA) == 0U);
+
+	return MMC_GET_STATE(resp_data[0]);
+}
+
+static int mmc_send_part_switch_cmd(unsigned int part_config)
+{
+	int ret;
+	unsigned int part_time = 0;
+
+	ret = mmc_send_cmd(MMC_CMD(6),
+			   EXTCSD_WRITE_BYTES |
+			   EXTCSD_CMD(CMD_EXTCSD_PARTITION_CONFIG) |
+			   EXTCSD_VALUE(part_config) |
+			   EXTCSD_CMD_SET_NORMAL,
+			   MMC_RESPONSE_R1B, NULL);
+	if (ret != 0) {
+		return ret;
+	}
+
+	/* Partition switch timing is in 10ms units */
+	part_time = mmc_ext_csd[CMD_EXTCSD_PART_SWITCH_TIME] * 10;
+
+	mdelay(part_time);
+
+	do {
+		ret = mmc_device_state();
+		if (ret < 0) {
+			return ret;
+		}
+	} while (ret == MMC_STATE_PRG);
+
+	return 0;
+}
+
+static int mmc_set_ext_csd(unsigned int ext_cmd, unsigned int value)
+{
+	int ret;
+
+	ret = mmc_send_cmd(MMC_CMD(6),
+			   EXTCSD_WRITE_BYTES | EXTCSD_CMD(ext_cmd) |
+			   EXTCSD_VALUE(value) | EXTCSD_CMD_SET_NORMAL,
+			   MMC_RESPONSE_R1B, NULL);
+	if (ret != 0) {
+		return ret;
+	}
+
+	do {
+		ret = mmc_device_state();
+		if (ret < 0) {
+			return ret;
+		}
+	} while (ret == MMC_STATE_PRG);
+
+	return 0;
+}
+
+static int mmc_sd_switch(unsigned int bus_width)
+{
+	int ret;
+	int retries = MMC_DEFAULT_MAX_RETRIES;
+	unsigned int bus_width_arg = 0;
+
+	ret = ops->prepare(0, (uintptr_t)&scr, sizeof(scr));
+	if (ret != 0) {
+		return ret;
+	}
+
+	/* CMD55: Application Specific Command */
+	ret = mmc_send_cmd(MMC_CMD(55), rca << RCA_SHIFT_OFFSET,
+			   MMC_RESPONSE_R5, NULL);
+	if (ret != 0) {
+		return ret;
+	}
+
+	/* ACMD51: SEND_SCR */
+	do {
+		ret = mmc_send_cmd(MMC_ACMD(51), 0, MMC_RESPONSE_R1, NULL);
+		if ((ret != 0) && (retries == 0)) {
+			ERROR("ACMD51 failed after %d retries (ret=%d)\n",
+			      MMC_DEFAULT_MAX_RETRIES, ret);
+			return ret;
+		}
+
+		retries--;
+	} while (ret != 0);
+
+	ret = ops->read(0, (uintptr_t)&scr, sizeof(scr));
+	if (ret != 0) {
+		return ret;
+	}
+
+	if (((scr[0] & SD_SCR_BUS_WIDTH_4) != 0U) &&
+	    (bus_width == MMC_BUS_WIDTH_4)) {
+		bus_width_arg = 2;
+	}
+
+	/* CMD55: Application Specific Command */
+	ret = mmc_send_cmd(MMC_CMD(55), rca << RCA_SHIFT_OFFSET,
+			   MMC_RESPONSE_R5, NULL);
+	if (ret != 0) {
+		return ret;
+	}
+
+	/* ACMD6: SET_BUS_WIDTH */
+	ret = mmc_send_cmd(MMC_ACMD(6), bus_width_arg, MMC_RESPONSE_R1, NULL);
+	if (ret != 0) {
+		return ret;
+	}
+
+	do {
+		ret = mmc_device_state();
+		if (ret < 0) {
+			return ret;
+		}
+	} while (ret == MMC_STATE_PRG);
+
+	return 0;
+}
+
+static int mmc_set_ios(unsigned int clk, unsigned int bus_width)
+{
+	int ret;
+	unsigned int width = bus_width;
+
+	if (mmc_dev_info->mmc_dev_type != MMC_IS_EMMC) {
+		if (width == MMC_BUS_WIDTH_8) {
+			WARN("Wrong bus config for SD-card, force to 4\n");
+			width = MMC_BUS_WIDTH_4;
+		}
+		ret = mmc_sd_switch(width);
+		if (ret != 0) {
+			return ret;
+		}
+	} else if (mmc_csd.spec_vers == 4U) {
+		ret = mmc_set_ext_csd(CMD_EXTCSD_BUS_WIDTH,
+				      (unsigned int)width);
+		if (ret != 0) {
+			return ret;
+		}
+	} else {
+		VERBOSE("Wrong MMC type or spec version\n");
+	}
+
+	return ops->set_ios(clk, width);
+}
+
+static int mmc_fill_device_info(void)
+{
+	unsigned long long c_size;
+	unsigned int speed_idx;
+	unsigned int nb_blocks;
+	unsigned int freq_unit;
+	int ret = 0;
+	struct mmc_csd_sd_v2 *csd_sd_v2;
+
+	switch (mmc_dev_info->mmc_dev_type) {
+	case MMC_IS_EMMC:
+		mmc_dev_info->block_size = MMC_BLOCK_SIZE;
+
+		ret = ops->prepare(0, (uintptr_t)&mmc_ext_csd,
+				   sizeof(mmc_ext_csd));
+		if (ret != 0) {
+			return ret;
+		}
+
+		/* MMC CMD8: SEND_EXT_CSD */
+		ret = mmc_send_cmd(MMC_CMD(8), 0, MMC_RESPONSE_R1, NULL);
+		if (ret != 0) {
+			return ret;
+		}
+
+		ret = ops->read(0, (uintptr_t)&mmc_ext_csd,
+				sizeof(mmc_ext_csd));
+		if (ret != 0) {
+			return ret;
+		}
+
+		do {
+			ret = mmc_device_state();
+			if (ret < 0) {
+				return ret;
+			}
+		} while (ret != MMC_STATE_TRAN);
+
+		nb_blocks = (mmc_ext_csd[CMD_EXTCSD_SEC_CNT] << 0) |
+			    (mmc_ext_csd[CMD_EXTCSD_SEC_CNT + 1] << 8) |
+			    (mmc_ext_csd[CMD_EXTCSD_SEC_CNT + 2] << 16) |
+			    (mmc_ext_csd[CMD_EXTCSD_SEC_CNT + 3] << 24);
+
+		mmc_dev_info->device_size = (unsigned long long)nb_blocks *
+			mmc_dev_info->block_size;
+
+		break;
+
+	case MMC_IS_SD:
+		/*
+		 * Use the same mmc_csd struct, as required fields here
+		 * (READ_BL_LEN, C_SIZE, CSIZE_MULT) are common with eMMC.
+		 */
+		mmc_dev_info->block_size = BIT_32(mmc_csd.read_bl_len);
+
+		c_size = ((unsigned long long)mmc_csd.c_size_high << 2U) |
+			 (unsigned long long)mmc_csd.c_size_low;
+		assert(c_size != 0xFFFU);
+
+		mmc_dev_info->device_size = (c_size + 1U) *
+					    BIT_64(mmc_csd.c_size_mult + 2U) *
+					    mmc_dev_info->block_size;
+
+		break;
+
+	case MMC_IS_SD_HC:
+		assert(mmc_csd.csd_structure == 1U);
+
+		mmc_dev_info->block_size = MMC_BLOCK_SIZE;
+
+		/* Need to use mmc_csd_sd_v2 struct */
+		csd_sd_v2 = (struct mmc_csd_sd_v2 *)&mmc_csd;
+		c_size = ((unsigned long long)csd_sd_v2->c_size_high << 16) |
+			 (unsigned long long)csd_sd_v2->c_size_low;
+
+		mmc_dev_info->device_size = (c_size + 1U) << MULT_BY_512K_SHIFT;
+
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	if (ret < 0) {
+		return ret;
+	}
+
+	speed_idx = (mmc_csd.tran_speed & CSD_TRAN_SPEED_MULT_MASK) >>
+			 CSD_TRAN_SPEED_MULT_SHIFT;
+
+	assert(speed_idx > 0U);
+
+	if (mmc_dev_info->mmc_dev_type == MMC_IS_EMMC) {
+		mmc_dev_info->max_bus_freq = tran_speed_base[speed_idx];
+	} else {
+		mmc_dev_info->max_bus_freq = sd_tran_speed_base[speed_idx];
+	}
+
+	freq_unit = mmc_csd.tran_speed & CSD_TRAN_SPEED_UNIT_MASK;
+	while (freq_unit != 0U) {
+		mmc_dev_info->max_bus_freq *= 10U;
+		--freq_unit;
+	}
+
+	mmc_dev_info->max_bus_freq *= 10000U;
+
+	return 0;
+}
+
+static int sd_switch(unsigned int mode, unsigned char group,
+		     unsigned char func)
+{
+	unsigned int group_shift = (group - 1U) * 4U;
+	unsigned int group_mask = GENMASK(group_shift + 3U,  group_shift);
+	unsigned int arg;
+	int ret;
+
+	ret = ops->prepare(0, (uintptr_t)&sd_switch_func_status,
+			   sizeof(sd_switch_func_status));
+	if (ret != 0) {
+		return ret;
+	}
+
+	/* MMC CMD6: SWITCH_FUNC */
+	arg = mode | SD_SWITCH_ALL_GROUPS_MASK;
+	arg &= ~group_mask;
+	arg |= func << group_shift;
+	ret = mmc_send_cmd(MMC_CMD(6), arg, MMC_RESPONSE_R1, NULL);
+	if (ret != 0) {
+		return ret;
+	}
+
+	return ops->read(0, (uintptr_t)&sd_switch_func_status,
+			 sizeof(sd_switch_func_status));
+}
+
+static int sd_send_op_cond(void)
+{
+	int n;
+	unsigned int resp_data[4];
+
+	for (n = 0; n < SEND_OP_COND_MAX_RETRIES; n++) {
+		int ret;
+
+		/* CMD55: Application Specific Command */
+		ret = mmc_send_cmd(MMC_CMD(55), 0, MMC_RESPONSE_R1, NULL);
+		if (ret != 0) {
+			return ret;
+		}
+
+		/* ACMD41: SD_SEND_OP_COND */
+		ret = mmc_send_cmd(MMC_ACMD(41), OCR_HCS |
+			mmc_dev_info->ocr_voltage, MMC_RESPONSE_R3,
+			&resp_data[0]);
+		if (ret != 0) {
+			return ret;
+		}
+
+		if ((resp_data[0] & OCR_POWERUP) != 0U) {
+			mmc_ocr_value = resp_data[0];
+
+			if ((mmc_ocr_value & OCR_HCS) != 0U) {
+				mmc_dev_info->mmc_dev_type = MMC_IS_SD_HC;
+			} else {
+				mmc_dev_info->mmc_dev_type = MMC_IS_SD;
+			}
+
+			return 0;
+		}
+
+		mdelay(10);
+	}
+
+	ERROR("ACMD41 failed after %d retries\n", SEND_OP_COND_MAX_RETRIES);
+
+	return -EIO;
+}
+
+static int mmc_reset_to_idle(void)
+{
+	int ret;
+
+	/* CMD0: reset to IDLE */
+	ret = mmc_send_cmd(MMC_CMD(0), 0, 0, NULL);
+	if (ret != 0) {
+		return ret;
+	}
+
+	mdelay(2);
+
+	return 0;
+}
+
+static int mmc_send_op_cond(void)
+{
+	int ret, n;
+	unsigned int resp_data[4];
+
+	ret = mmc_reset_to_idle();
+	if (ret != 0) {
+		return ret;
+	}
+
+	for (n = 0; n < SEND_OP_COND_MAX_RETRIES; n++) {
+		ret = mmc_send_cmd(MMC_CMD(1), OCR_SECTOR_MODE |
+				   OCR_VDD_MIN_2V7 | OCR_VDD_MIN_1V7,
+				   MMC_RESPONSE_R3, &resp_data[0]);
+		if (ret != 0) {
+			return ret;
+		}
+
+		if ((resp_data[0] & OCR_POWERUP) != 0U) {
+			mmc_ocr_value = resp_data[0];
+			return 0;
+		}
+
+		mdelay(10);
+	}
+
+	ERROR("CMD1 failed after %d retries\n", SEND_OP_COND_MAX_RETRIES);
+
+	return -EIO;
+}
+
+static int mmc_enumerate(unsigned int clk, unsigned int bus_width)
+{
+	int ret;
+	unsigned int resp_data[4];
+
+	ops->init();
+
+	ret = mmc_reset_to_idle();
+	if (ret != 0) {
+		return ret;
+	}
+
+	if (mmc_dev_info->mmc_dev_type == MMC_IS_EMMC) {
+		ret = mmc_send_op_cond();
+	} else {
+		/* CMD8: Send Interface Condition Command */
+		ret = mmc_send_cmd(MMC_CMD(8), VHS_2_7_3_6_V | CMD8_CHECK_PATTERN,
+				   MMC_RESPONSE_R5, &resp_data[0]);
+
+		if ((ret == 0) && ((resp_data[0] & 0xffU) == CMD8_CHECK_PATTERN)) {
+			ret = sd_send_op_cond();
+		}
+	}
+	if (ret != 0) {
+		return ret;
+	}
+
+	/* CMD2: Card Identification */
+	ret = mmc_send_cmd(MMC_CMD(2), 0, MMC_RESPONSE_R2, NULL);
+	if (ret != 0) {
+		return ret;
+	}
+
+	/* CMD3: Set Relative Address */
+	if (mmc_dev_info->mmc_dev_type == MMC_IS_EMMC) {
+		rca = MMC_FIX_RCA;
+		ret = mmc_send_cmd(MMC_CMD(3), rca << RCA_SHIFT_OFFSET,
+				   MMC_RESPONSE_R1, NULL);
+		if (ret != 0) {
+			return ret;
+		}
+	} else {
+		ret = mmc_send_cmd(MMC_CMD(3), 0,
+				   MMC_RESPONSE_R6, &resp_data[0]);
+		if (ret != 0) {
+			return ret;
+		}
+
+		rca = (resp_data[0] & 0xFFFF0000U) >> 16;
+	}
+
+	/* CMD9: CSD Register */
+	ret = mmc_send_cmd(MMC_CMD(9), rca << RCA_SHIFT_OFFSET,
+			   MMC_RESPONSE_R2, &resp_data[0]);
+	if (ret != 0) {
+		return ret;
+	}
+
+	memcpy(&mmc_csd, &resp_data, sizeof(resp_data));
+
+	/* CMD7: Select Card */
+	ret = mmc_send_cmd(MMC_CMD(7), rca << RCA_SHIFT_OFFSET,
+			   MMC_RESPONSE_R1, NULL);
+	if (ret != 0) {
+		return ret;
+	}
+
+	do {
+		ret = mmc_device_state();
+		if (ret < 0) {
+			return ret;
+		}
+	} while (ret != MMC_STATE_TRAN);
+
+	ret = mmc_set_ios(clk, bus_width);
+	if (ret != 0) {
+		return ret;
+	}
+
+	ret = mmc_fill_device_info();
+	if (ret != 0) {
+		return ret;
+	}
+
+	if (is_sd_cmd6_enabled() &&
+	    (mmc_dev_info->mmc_dev_type == MMC_IS_SD_HC)) {
+		/* Try to switch to High Speed Mode */
+		ret = sd_switch(SD_SWITCH_FUNC_CHECK, 1U, 1U);
+		if (ret != 0) {
+			return ret;
+		}
+
+		if ((sd_switch_func_status.support_g1 & BIT(9)) == 0U) {
+			/* High speed not supported, keep default speed */
+			return 0;
+		}
+
+		ret = sd_switch(SD_SWITCH_FUNC_SWITCH, 1U, 1U);
+		if (ret != 0) {
+			return ret;
+		}
+
+		if ((sd_switch_func_status.sel_g2_g1 & 0x1U) == 0U) {
+			/* Cannot switch to high speed, keep default speed */
+			return 0;
+		}
+
+		mmc_dev_info->max_bus_freq = 50000000U;
+		ret = ops->set_ios(clk, bus_width);
+	}
+
+	return ret;
+}
+
+size_t mmc_read_blocks(int lba, uintptr_t buf, size_t size)
+{
+	int ret;
+	unsigned int cmd_idx, cmd_arg;
+
+	assert((ops != NULL) &&
+	       (ops->read != NULL) &&
+	       (size != 0U) &&
+	       ((size & MMC_BLOCK_MASK) == 0U));
+
+	ret = ops->prepare(lba, buf, size);
+	if (ret != 0) {
+		return 0;
+	}
+
+	if (is_cmd23_enabled()) {
+		/* Set block count */
+		ret = mmc_send_cmd(MMC_CMD(23), size / MMC_BLOCK_SIZE,
+				   MMC_RESPONSE_R1, NULL);
+		if (ret != 0) {
+			return 0;
+		}
+
+		cmd_idx = MMC_CMD(18);
+	} else {
+		if (size > MMC_BLOCK_SIZE) {
+			cmd_idx = MMC_CMD(18);
+		} else {
+			cmd_idx = MMC_CMD(17);
+		}
+	}
+
+	if (((mmc_ocr_value & OCR_ACCESS_MODE_MASK) == OCR_BYTE_MODE) &&
+	    (mmc_dev_info->mmc_dev_type != MMC_IS_SD_HC)) {
+		cmd_arg = lba * MMC_BLOCK_SIZE;
+	} else {
+		cmd_arg = lba;
+	}
+
+	ret = mmc_send_cmd(cmd_idx, cmd_arg, MMC_RESPONSE_R1, NULL);
+	if (ret != 0) {
+		return 0;
+	}
+
+	ret = ops->read(lba, buf, size);
+	if (ret != 0) {
+		return 0;
+	}
+
+	/* Wait buffer empty */
+	do {
+		ret = mmc_device_state();
+		if (ret < 0) {
+			return 0;
+		}
+	} while ((ret != MMC_STATE_TRAN) && (ret != MMC_STATE_DATA));
+
+	if (!is_cmd23_enabled() && (size > MMC_BLOCK_SIZE)) {
+		ret = mmc_send_cmd(MMC_CMD(12), 0, MMC_RESPONSE_R1B, NULL);
+		if (ret != 0) {
+			return 0;
+		}
+	}
+
+	return size;
+}
+
+size_t mmc_write_blocks(int lba, const uintptr_t buf, size_t size)
+{
+	int ret;
+	unsigned int cmd_idx, cmd_arg;
+
+	assert((ops != NULL) &&
+	       (ops->write != NULL) &&
+	       (size != 0U) &&
+	       ((buf & MMC_BLOCK_MASK) == 0U) &&
+	       ((size & MMC_BLOCK_MASK) == 0U));
+
+	ret = ops->prepare(lba, buf, size);
+	if (ret != 0) {
+		return 0;
+	}
+
+	if (is_cmd23_enabled()) {
+		/* Set block count */
+		ret = mmc_send_cmd(MMC_CMD(23), size / MMC_BLOCK_SIZE,
+				   MMC_RESPONSE_R1, NULL);
+		if (ret != 0) {
+			return 0;
+		}
+
+		cmd_idx = MMC_CMD(25);
+	} else {
+		if (size > MMC_BLOCK_SIZE) {
+			cmd_idx = MMC_CMD(25);
+		} else {
+			cmd_idx = MMC_CMD(24);
+		}
+	}
+
+	if ((mmc_ocr_value & OCR_ACCESS_MODE_MASK) == OCR_BYTE_MODE) {
+		cmd_arg = lba * MMC_BLOCK_SIZE;
+	} else {
+		cmd_arg = lba;
+	}
+
+	ret = mmc_send_cmd(cmd_idx, cmd_arg, MMC_RESPONSE_R1, NULL);
+	if (ret != 0) {
+		return 0;
+	}
+
+	ret = ops->write(lba, buf, size);
+	if (ret != 0) {
+		return 0;
+	}
+
+	/* Wait buffer empty */
+	do {
+		ret = mmc_device_state();
+		if (ret < 0) {
+			return 0;
+		}
+	} while ((ret != MMC_STATE_TRAN) && (ret != MMC_STATE_RCV));
+
+	if (!is_cmd23_enabled() && (size > MMC_BLOCK_SIZE)) {
+		ret = mmc_send_cmd(MMC_CMD(12), 0, MMC_RESPONSE_R1B, NULL);
+		if (ret != 0) {
+			return 0;
+		}
+	}
+
+	return size;
+}
+
+size_t mmc_erase_blocks(int lba, size_t size)
+{
+	int ret;
+
+	assert(ops != NULL);
+	assert((size != 0U) && ((size & MMC_BLOCK_MASK) == 0U));
+
+	ret = mmc_send_cmd(MMC_CMD(35), lba, MMC_RESPONSE_R1, NULL);
+	if (ret != 0) {
+		return 0;
+	}
+
+	ret = mmc_send_cmd(MMC_CMD(36), lba + (size / MMC_BLOCK_SIZE) - 1U,
+			   MMC_RESPONSE_R1, NULL);
+	if (ret != 0) {
+		return 0;
+	}
+
+	ret = mmc_send_cmd(MMC_CMD(38), lba, MMC_RESPONSE_R1B, NULL);
+	if (ret != 0) {
+		return 0;
+	}
+
+	do {
+		ret = mmc_device_state();
+		if (ret < 0) {
+			return 0;
+		}
+	} while (ret != MMC_STATE_TRAN);
+
+	return size;
+}
+
+static int mmc_part_switch(unsigned int part_type)
+{
+	uint8_t part_config = mmc_ext_csd[CMD_EXTCSD_PARTITION_CONFIG];
+
+	part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
+	part_config |= part_type;
+
+	return mmc_send_part_switch_cmd(part_config);
+}
+
+static unsigned char mmc_current_boot_part(void)
+{
+	return PART_CFG_CURRENT_BOOT_PARTITION(mmc_ext_csd[CMD_EXTCSD_PARTITION_CONFIG]);
+}
+
+int mmc_part_switch_current_boot(void)
+{
+	unsigned char current_boot_part = mmc_current_boot_part();
+	int ret;
+
+	if (current_boot_part != 1U &&
+	    current_boot_part != 2U) {
+		ERROR("Got unexpected value for active boot partition, %u\n", current_boot_part);
+		return -EIO;
+	}
+
+	ret = mmc_part_switch(current_boot_part);
+	if (ret < 0) {
+		ERROR("Failed to switch to boot partition, %d\n", ret);
+	}
+
+	return ret;
+}
+
+int mmc_part_switch_user(void)
+{
+	int ret;
+
+	ret = mmc_part_switch(PART_CFG_BOOT_PARTITION_NO_ACCESS);
+	if (ret < 0) {
+		ERROR("Failed to switch to user partition, %d\n", ret);
+	}
+
+	return ret;
+}
+
+size_t mmc_boot_part_size(void)
+{
+	return mmc_ext_csd[CMD_EXTCSD_BOOT_SIZE_MULT] * SZ_128K;
+}
+
+size_t mmc_boot_part_read_blocks(int lba, uintptr_t buf, size_t size)
+{
+	size_t size_read;
+	int ret;
+
+	ret = mmc_part_switch_current_boot();
+	if (ret < 0) {
+		return 0;
+	}
+
+	size_read = mmc_read_blocks(lba, buf, size);
+
+	ret = mmc_part_switch_user();
+	if (ret < 0) {
+		return 0;
+	}
+
+	return size_read;
+}
+
+int mmc_init(const struct mmc_ops *ops_ptr, unsigned int clk,
+	     unsigned int width, unsigned int flags,
+	     struct mmc_device_info *device_info)
+{
+	assert((ops_ptr != NULL) &&
+	       (ops_ptr->init != NULL) &&
+	       (ops_ptr->send_cmd != NULL) &&
+	       (ops_ptr->set_ios != NULL) &&
+	       (ops_ptr->prepare != NULL) &&
+	       (ops_ptr->read != NULL) &&
+	       (ops_ptr->write != NULL) &&
+	       (device_info != NULL) &&
+	       (clk != 0) &&
+	       ((width == MMC_BUS_WIDTH_1) ||
+		(width == MMC_BUS_WIDTH_4) ||
+		(width == MMC_BUS_WIDTH_8) ||
+		(width == MMC_BUS_WIDTH_DDR_4) ||
+		(width == MMC_BUS_WIDTH_DDR_8)));
+
+	ops = ops_ptr;
+	mmc_flags = flags;
+	mmc_dev_info = device_info;
+
+	return mmc_enumerate(clk, width);
+}