drivers: add emmc stack

In a lot of embedded platforms, eMMC device is the only one storage
device. So loading content from eMMC device is required in ATF.

Create the emmc stack that could co-work with IO block driver.
Support to read/write/erase eMMC blocks on both rpmb and normal
user area. Support to change the IO speed and bus width.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>

1 files changed, 347 insertions, 0 deletions

diff --git a/drivers/emmc/emmc.c b/drivers/emmc/emmc.c
new file mode 100644
index 00000000..5fe28efc
--- /dev/null
+++ b/drivers/emmc/emmc.c
@@ -0,0 +1,347 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Defines a simple and generic interface to access eMMC device.
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <debug.h>
+#include <emmc.h>
+#include <errno.h>
+#include <string.h>
+
+static const emmc_ops_t *ops;
+static unsigned int emmc_ocr_value;
+static emmc_csd_t emmc_csd;
+
+static int emmc_device_state(void)
+{
+	emmc_cmd_t cmd;
+	int ret;
+
+	do {
+		memset(&cmd, 0, sizeof(emmc_cmd_t));
+		cmd.cmd_idx = EMMC_CMD13;
+		cmd.cmd_arg = EMMC_FIX_RCA << RCA_SHIFT_OFFSET;
+		cmd.resp_type = EMMC_RESPONSE_R1;
+		ret = ops->send_cmd(&cmd);
+		assert(ret == 0);
+		assert((cmd.resp_data[0] & STATUS_SWITCH_ERROR) == 0);
+		/* Ignore improbable errors in release builds */
+		(void)ret;
+	} while ((cmd.resp_data[0] & STATUS_READY_FOR_DATA) == 0);
+	return EMMC_GET_STATE(cmd.resp_data[0]);
+}
+
+static void emmc_set_ext_csd(unsigned int ext_cmd, unsigned int value)
+{
+	emmc_cmd_t cmd;
+	int ret, state;
+
+	memset(&cmd, 0, sizeof(emmc_cmd_t));
+	cmd.cmd_idx = EMMC_CMD6;
+	cmd.cmd_arg = EXTCSD_WRITE_BYTES | EXTCSD_CMD(ext_cmd) |
+		      EXTCSD_VALUE(value) | 1;
+	ret = ops->send_cmd(&cmd);
+	assert(ret == 0);
+
+	/* wait to exit PRG state */
+	do {
+		state = emmc_device_state();
+	} while (state == EMMC_STATE_PRG);
+	/* Ignore improbable errors in release builds */
+	(void)ret;
+}
+
+static void emmc_set_ios(int clk, int bus_width)
+{
+	int ret;
+
+	/* set IO speed & IO bus width */
+	if (emmc_csd.spec_vers == 4)
+		emmc_set_ext_csd(CMD_EXTCSD_BUS_WIDTH, bus_width);
+	ret = ops->set_ios(clk, bus_width);
+	assert(ret == 0);
+	/* Ignore improbable errors in release builds */
+	(void)ret;
+}
+
+static int emmc_enumerate(int clk, int bus_width)
+{
+	emmc_cmd_t cmd;
+	int ret, state;
+
+	ops->init();
+
+	/* CMD0: reset to IDLE */
+	memset(&cmd, 0, sizeof(emmc_cmd_t));
+	cmd.cmd_idx = EMMC_CMD0;
+	ret = ops->send_cmd(&cmd);
+	assert(ret == 0);
+
+	while (1) {
+		/* CMD1: get OCR register */
+		memset(&cmd, 0, sizeof(emmc_cmd_t));
+		cmd.cmd_idx = EMMC_CMD1;
+		cmd.cmd_arg = OCR_SECTOR_MODE | OCR_VDD_MIN_2V7 |
+			      OCR_VDD_MIN_1V7;
+		cmd.resp_type = EMMC_RESPONSE_R3;
+		ret = ops->send_cmd(&cmd);
+		assert(ret == 0);
+		emmc_ocr_value = cmd.resp_data[0];
+		if (emmc_ocr_value & OCR_POWERUP)
+			break;
+	}
+
+	/* CMD2: Card Identification */
+	memset(&cmd, 0, sizeof(emmc_cmd_t));
+	cmd.cmd_idx = EMMC_CMD2;
+	cmd.resp_type = EMMC_RESPONSE_R2;
+	ret = ops->send_cmd(&cmd);
+	assert(ret == 0);
+
+	/* CMD3: Set Relative Address */
+	memset(&cmd, 0, sizeof(emmc_cmd_t));
+	cmd.cmd_idx = EMMC_CMD3;
+	cmd.cmd_arg = EMMC_FIX_RCA << RCA_SHIFT_OFFSET;
+	cmd.resp_type = EMMC_RESPONSE_R1;
+	ret = ops->send_cmd(&cmd);
+	assert(ret == 0);
+
+	/* CMD9: CSD Register */
+	memset(&cmd, 0, sizeof(emmc_cmd_t));
+	cmd.cmd_idx = EMMC_CMD9;
+	cmd.cmd_arg = EMMC_FIX_RCA << RCA_SHIFT_OFFSET;
+	cmd.resp_type = EMMC_RESPONSE_R2;
+	ret = ops->send_cmd(&cmd);
+	assert(ret == 0);
+	memcpy(&emmc_csd, &cmd.resp_data, sizeof(cmd.resp_data));
+
+	/* CMD7: Select Card */
+	memset(&cmd, 0, sizeof(emmc_cmd_t));
+	cmd.cmd_idx = EMMC_CMD7;
+	cmd.cmd_arg = EMMC_FIX_RCA << RCA_SHIFT_OFFSET;
+	cmd.resp_type = EMMC_RESPONSE_R1;
+	ret = ops->send_cmd(&cmd);
+	assert(ret == 0);
+	/* wait to TRAN state */
+	do {
+		state = emmc_device_state();
+	} while (state != EMMC_STATE_TRAN);
+
+	emmc_set_ios(clk, bus_width);
+	return ret;
+}
+
+size_t emmc_read_blocks(int lba, uintptr_t buf, size_t size)
+{
+	emmc_cmd_t cmd;
+	int ret;
+
+	assert((ops != 0) &&
+	       (ops->read != 0) &&
+	       ((buf & EMMC_BLOCK_MASK) == 0) &&
+	       ((size & EMMC_BLOCK_MASK) == 0));
+
+	inv_dcache_range(buf, size);
+	ret = ops->prepare(lba, buf, size);
+	assert(ret == 0);
+
+	memset(&cmd, 0, sizeof(emmc_cmd_t));
+	if (size > EMMC_BLOCK_SIZE)
+		cmd.cmd_idx = EMMC_CMD18;
+	else
+		cmd.cmd_idx = EMMC_CMD17;
+	if ((emmc_ocr_value & OCR_ACCESS_MODE_MASK) == OCR_BYTE_MODE)
+		cmd.cmd_arg = lba * EMMC_BLOCK_SIZE;
+	else
+		cmd.cmd_arg = lba;
+	cmd.resp_type = EMMC_RESPONSE_R1;
+	ret = ops->send_cmd(&cmd);
+	assert(ret == 0);
+
+	ret = ops->read(lba, buf, size);
+	assert(ret == 0);
+
+	/* wait buffer empty */
+	emmc_device_state();
+
+	if (size > EMMC_BLOCK_SIZE) {
+		memset(&cmd, 0, sizeof(emmc_cmd_t));
+		cmd.cmd_idx = EMMC_CMD12;
+		ret = ops->send_cmd(&cmd);
+		assert(ret == 0);
+	}
+	/* Ignore improbable errors in release builds */
+	(void)ret;
+	return size;
+}
+
+size_t emmc_write_blocks(int lba, const uintptr_t buf, size_t size)
+{
+	emmc_cmd_t cmd;
+	int ret;
+
+	assert((ops != 0) &&
+	       (ops->write != 0) &&
+	       ((buf & EMMC_BLOCK_MASK) == 0) &&
+	       ((size & EMMC_BLOCK_MASK) == 0));
+
+	clean_dcache_range(buf, size);
+	ret = ops->prepare(lba, buf, size);
+	assert(ret == 0);
+
+	memset(&cmd, 0, sizeof(emmc_cmd_t));
+	if (size > EMMC_BLOCK_SIZE)
+		cmd.cmd_idx = EMMC_CMD25;
+	else
+		cmd.cmd_idx = EMMC_CMD24;
+	if ((emmc_ocr_value & OCR_ACCESS_MODE_MASK) == OCR_BYTE_MODE)
+		cmd.cmd_arg = lba * EMMC_BLOCK_SIZE;
+	else
+		cmd.cmd_arg = lba;
+	cmd.resp_type = EMMC_RESPONSE_R1;
+	ret = ops->send_cmd(&cmd);
+	assert(ret == 0);
+
+	ret = ops->write(lba, buf, size);
+	assert(ret == 0);
+
+	/* wait buffer empty */
+	emmc_device_state();
+
+	if (size > EMMC_BLOCK_SIZE) {
+		memset(&cmd, 0, sizeof(emmc_cmd_t));
+		cmd.cmd_idx = EMMC_CMD12;
+		ret = ops->send_cmd(&cmd);
+		assert(ret == 0);
+	}
+	/* Ignore improbable errors in release builds */
+	(void)ret;
+	return size;
+}
+
+size_t emmc_erase_blocks(int lba, size_t size)
+{
+	emmc_cmd_t cmd;
+	int ret, state;
+
+	assert(ops != 0);
+	assert((size != 0) && ((size % EMMC_BLOCK_SIZE) == 0));
+
+	memset(&cmd, 0, sizeof(emmc_cmd_t));
+	cmd.cmd_idx = EMMC_CMD35;
+	cmd.cmd_arg = lba;
+	cmd.resp_type = EMMC_RESPONSE_R1;
+	ret = ops->send_cmd(&cmd);
+	assert(ret == 0);
+
+	memset(&cmd, 0, sizeof(emmc_cmd_t));
+	cmd.cmd_idx = EMMC_CMD36;
+	cmd.cmd_arg = lba + (size / EMMC_BLOCK_SIZE) - 1;
+	cmd.resp_type = EMMC_RESPONSE_R1;
+	ret = ops->send_cmd(&cmd);
+	assert(ret == 0);
+
+	memset(&cmd, 0, sizeof(emmc_cmd_t));
+	cmd.cmd_idx = EMMC_CMD38;
+	cmd.resp_type = EMMC_RESPONSE_R1B;
+	ret = ops->send_cmd(&cmd);
+	assert(ret == 0);
+
+	/* wait to TRAN state */
+	do {
+		state = emmc_device_state();
+	} while (state != EMMC_STATE_TRAN);
+	/* Ignore improbable errors in release builds */
+	(void)ret;
+	return size;
+}
+
+static inline void emmc_rpmb_enable(void)
+{
+	emmc_set_ext_csd(CMD_EXTCSD_PARTITION_CONFIG,
+			PART_CFG_BOOT_PARTITION1_ENABLE |
+			PART_CFG_PARTITION1_ACCESS);
+}
+
+static inline void emmc_rpmb_disable(void)
+{
+	emmc_set_ext_csd(CMD_EXTCSD_PARTITION_CONFIG,
+			PART_CFG_BOOT_PARTITION1_ENABLE);
+}
+
+size_t emmc_rpmb_read_blocks(int lba, uintptr_t buf, size_t size)
+{
+	size_t size_read;
+
+	emmc_rpmb_enable();
+	size_read = emmc_read_blocks(lba, buf, size);
+	emmc_rpmb_disable();
+	return size_read;
+}
+
+size_t emmc_rpmb_write_blocks(int lba, const uintptr_t buf, size_t size)
+{
+	size_t size_written;
+
+	emmc_rpmb_enable();
+	size_written = emmc_write_blocks(lba, buf, size);
+	emmc_rpmb_disable();
+	return size_written;
+}
+
+size_t emmc_rpmb_erase_blocks(int lba, size_t size)
+{
+	size_t size_erased;
+
+	emmc_rpmb_enable();
+	size_erased = emmc_erase_blocks(lba, size);
+	emmc_rpmb_disable();
+	return size_erased;
+}
+
+void emmc_init(const emmc_ops_t *ops_ptr, int clk, int width)
+{
+	assert((ops_ptr != 0) &&
+	       (ops_ptr->init != 0) &&
+	       (ops_ptr->send_cmd != 0) &&
+	       (ops_ptr->set_ios != 0) &&
+	       (ops_ptr->prepare != 0) &&
+	       (ops_ptr->read != 0) &&
+	       (ops_ptr->write != 0) &&
+	       (clk != 0) &&
+	       ((width == EMMC_BUS_WIDTH_1) ||
+		(width == EMMC_BUS_WIDTH_4) ||
+		(width == EMMC_BUS_WIDTH_8)));
+	ops = ops_ptr;
+
+	emmc_enumerate(clk, width);
+}