From f462c1249ac41f43423011bb12ace38cbeb0af4c Mon Sep 17 00:00:00 2001
From: Yann Gautier <yann.gautier@st.com>
Date: Thu, 1 Sep 2022 19:23:39 +0200
Subject: [PATCH] feat(mmc): get boot partition size
The boot partition size of an eMMC is given in ext_csd register, at
offset 226 (BOOT_SIZE_MULT), which has to be multiplied by 128kB.
Add a helper function mmc_boot_part_size() to get this eMMC boot
partition size.
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I0e8e0fc9632f147fa1b1b3374accb78439025403
---
drivers/mmc/mmc.c | 5 +++++
include/drivers/mmc.h | 2 ++
2 files changed, 7 insertions(+)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 1b6e96b07..51e94be61 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -805,6 +805,11 @@ int mmc_part_switch_user(void)
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;
diff --git a/include/drivers/mmc.h b/include/drivers/mmc.h
index e973248f7..e94693dd7 100644
--- a/include/drivers/mmc.h
+++ b/include/drivers/mmc.h
@@ -62,6 +62,7 @@
#define CMD_EXTCSD_HS_TIMING 185
#define CMD_EXTCSD_PART_SWITCH_TIME 199
#define CMD_EXTCSD_SEC_CNT 212
+#define CMD_EXTCSD_BOOT_SIZE_MULT 226
#define EXT_CSD_PART_CONFIG_ACC_MASK GENMASK(2, 0)
#define PART_CFG_BOOT_PARTITION1_ENABLE (U(1) << 3)
@@ -262,6 +263,7 @@ size_t mmc_write_blocks(int lba, const uintptr_t buf, size_t size);
size_t mmc_erase_blocks(int lba, size_t size);
int mmc_part_switch_current_boot(void);
int mmc_part_switch_user(void);
+size_t mmc_boot_part_size(void);
size_t mmc_boot_part_read_blocks(int lba, uintptr_t buf, size_t size);
int mmc_init(const struct mmc_ops *ops_ptr, unsigned int clk,
unsigned int width, unsigned int flags,