[U-Boot] [PATCH V9 7/9] MMC: APIs to support resize of EMMC boot partition
amar_g
amarendra.xt at samsung.com
Sat Apr 27 08:12:58 CEST 2013
From: Amar <amarendra.xt at samsung.com>
This patch adds APIs to access(open / close) and to resize boot partiton of EMMC.
Signed-off-by: Amar <amarendra.xt at samsung.com>
---
Changes since V1:
New patch.
Changes since V2:
1)Updation of commit message and resubmition of proper patch set.
Changes since V3:
No change.
Changes since V4:
1)Replaced the functions mmc_boot_open() & mmc_boot_close() with a
single function mmc_boot_part_access().
Changes since V5:
1)Updated in response to review comments.
Changes since V6:
1)Added spaces around << operator, in response to review comments.
Changes since V7:
1)In the file drivers/mmc/mmc.c, the piece of code involved in
open/close and resize of EMMC boot partition has been made conditional
and is enabled only if the macro CONFIG_SUPPORT_EMMC_BOOT is defined.
Changes since V8:
1)Changed type of input parameters from u32 to u8 for the function
mmc_boot_part_access().
---
drivers/mmc/mmc.c | 134 +++++++++++++++++++++++++++++++++++++++++++++++++++++
include/mmc.h | 26 ++++++++++
2 files changed, 160 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index d732581..954d7cd 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1352,3 +1352,137 @@ int mmc_initialize(bd_t *bis)
return 0;
}
+
+#ifdef CONFIG_SUPPORT_EMMC_BOOT
+/*
+ * This function changes the size of boot partition and the size of rpmb
+ * partition present on EMMC devices.
+ *
+ * Input Parameters:
+ * struct *mmc: pointer for the mmc device strcuture
+ * bootsize: size of boot partition
+ * rpmbsize: size of rpmb partition
+ *
+ * Returns 0 on success.
+ */
+
+int mmc_boot_partition_size_change(struct mmc *mmc, unsigned long bootsize,
+ unsigned long rpmbsize)
+{
+ int err;
+ struct mmc_cmd cmd;
+
+ /* Only use this command for raw EMMC moviNAND. Enter backdoor mode */
+ cmd.cmdidx = MMC_CMD_RES_MAN;
+ cmd.resp_type = MMC_RSP_R1b;
+ cmd.cmdarg = MMC_CMD62_ARG1;
+
+ err = mmc_send_cmd(mmc, &cmd, NULL);
+ if (err) {
+ debug("mmc_boot_partition_size_change: Error1 = %d\n", err);
+ return err;
+ }
+
+ /* Boot partition changing mode */
+ cmd.cmdidx = MMC_CMD_RES_MAN;
+ cmd.resp_type = MMC_RSP_R1b;
+ cmd.cmdarg = MMC_CMD62_ARG2;
+
+ err = mmc_send_cmd(mmc, &cmd, NULL);
+ if (err) {
+ debug("mmc_boot_partition_size_change: Error2 = %d\n", err);
+ return err;
+ }
+ /* boot partition size is multiple of 128KB */
+ bootsize = (bootsize * 1024) / 128;
+
+ /* Arg: boot partition size */
+ cmd.cmdidx = MMC_CMD_RES_MAN;
+ cmd.resp_type = MMC_RSP_R1b;
+ cmd.cmdarg = bootsize;
+
+ err = mmc_send_cmd(mmc, &cmd, NULL);
+ if (err) {
+ debug("mmc_boot_partition_size_change: Error3 = %d\n", err);
+ return err;
+ }
+ /* RPMB partition size is multiple of 128KB */
+ rpmbsize = (rpmbsize * 1024) / 128;
+ /* Arg: RPMB partition size */
+ cmd.cmdidx = MMC_CMD_RES_MAN;
+ cmd.resp_type = MMC_RSP_R1b;
+ cmd.cmdarg = rpmbsize;
+
+ err = mmc_send_cmd(mmc, &cmd, NULL);
+ if (err) {
+ debug("mmc_boot_partition_size_change: Error4 = %d\n", err);
+ return err;
+ }
+ return 0;
+}
+
+/*
+ * This function shall form and send the commands to open / close the
+ * boot partition specified by user.
+ *
+ * Input Parameters:
+ * ack: 0x0 - No boot acknowledge sent (default)
+ * 0x1 - Boot acknowledge sent during boot operation
+ * part_num: User selects boot data that will be sent to master
+ * 0x0 - Device not boot enabled (default)
+ * 0x1 - Boot partition 1 enabled for boot
+ * 0x2 - Boot partition 2 enabled for boot
+ * access: User selects partitions to access
+ * 0x0 : No access to boot partition (default)
+ * 0x1 : R/W boot partition 1
+ * 0x2 : R/W boot partition 2
+ * 0x3 : R/W Replay Protected Memory Block (RPMB)
+ *
+ * Returns 0 on success.
+ */
+int mmc_boot_part_access(struct mmc *mmc, u8 ack, u8 part_num, u8 access)
+{
+ int err;
+ struct mmc_cmd cmd;
+
+ /* Boot ack enable, boot partition enable , boot partition access */
+ cmd.cmdidx = MMC_CMD_SWITCH;
+ cmd.resp_type = MMC_RSP_R1b;
+
+ cmd.cmdarg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
+ (EXT_CSD_PART_CONF << 16) |
+ ((EXT_CSD_BOOT_ACK(ack) |
+ EXT_CSD_BOOT_PART_NUM(part_num) |
+ EXT_CSD_PARTITION_ACCESS(access)) << 8);
+
+ err = mmc_send_cmd(mmc, &cmd, NULL);
+ if (err) {
+ if (access) {
+ debug("mmc boot partition#%d open fail:Error1 = %d\n",
+ part_num, err);
+ } else {
+ debug("mmc boot partition#%d close fail:Error = %d\n",
+ part_num, err);
+ }
+ return err;
+ }
+
+ if (access) {
+ /* 4bit transfer mode at booting time. */
+ cmd.cmdidx = MMC_CMD_SWITCH;
+ cmd.resp_type = MMC_RSP_R1b;
+
+ cmd.cmdarg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
+ (EXT_CSD_BOOT_BUS_WIDTH << 16) |
+ ((1 << 0) << 8);
+
+ err = mmc_send_cmd(mmc, &cmd, NULL);
+ if (err) {
+ debug("mmc boot partition#%d open fail:Error2 = %d\n",
+ part_num, err);
+ return err;
+ }
+ }
+ return 0;
+}
+#endif
diff --git a/include/mmc.h b/include/mmc.h
index de6d497..af680cd 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -86,6 +86,11 @@
#define MMC_CMD_APP_CMD 55
#define MMC_CMD_SPI_READ_OCR 58
#define MMC_CMD_SPI_CRC_ON_OFF 59
+#define MMC_CMD_RES_MAN 62
+
+#define MMC_CMD62_ARG1 0xefac62ec
+#define MMC_CMD62_ARG2 0xcbaea7
+
#define SD_CMD_SEND_RELATIVE_ADDR 3
#define SD_CMD_SWITCH_FUNC 6
@@ -153,6 +158,7 @@
*/
#define EXT_CSD_PARTITIONING_SUPPORT 160 /* RO */
#define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */
+#define EXT_CSD_BOOT_BUS_WIDTH 177
#define EXT_CSD_PART_CONF 179 /* R/W */
#define EXT_CSD_BUS_WIDTH 183 /* R/W */
#define EXT_CSD_HS_TIMING 185 /* R/W */
@@ -177,6 +183,16 @@
#define EXT_CSD_BUS_WIDTH_4 1 /* Card is in 4 bit mode */
#define EXT_CSD_BUS_WIDTH_8 2 /* Card is in 8 bit mode */
+#define EXT_CSD_BOOT_ACK_ENABLE (1 << 6)
+#define EXT_CSD_BOOT_PARTITION_ENABLE (1 << 3)
+#define EXT_CSD_PARTITION_ACCESS_ENABLE (1 << 0)
+#define EXT_CSD_PARTITION_ACCESS_DISABLE (0 << 0)
+
+#define EXT_CSD_BOOT_ACK(x) (x << 6)
+#define EXT_CSD_BOOT_PART_NUM(x) (x << 3)
+#define EXT_CSD_PARTITION_ACCESS(x) (x << 0)
+
+
#define R1_ILLEGAL_COMMAND (1 << 22)
#define R1_APP_CMD (1 << 5)
@@ -201,6 +217,11 @@
#define PART_ACCESS_MASK (0x7)
#define PART_SUPPORT (0x1)
+/* The number of MMC physical partitions. These consist of:
+ * boot partitions (2), general purpose partitions (4) in MMC v4.4.
+ */
+#define MMC_NUM_BOOT_PARTITION 2
+
struct mmc_cid {
unsigned long psn;
unsigned short oid;
@@ -277,6 +298,11 @@ int mmc_switch_part(int dev_num, unsigned int part_num);
int mmc_getcd(struct mmc *mmc);
int mmc_getwp(struct mmc *mmc);
void spl_mmc_load(void) __noreturn;
+/* Function to change the size of boot partition and rpmb partitions */
+int mmc_boot_partition_size_change(struct mmc *mmc, unsigned long bootsize,
+ unsigned long rpmbsize);
+/* Function to send commands to open/close the specified boot partition */
+int mmc_boot_part_access(struct mmc *mmc, u8 ack, u8 part_num, u8 access);
#ifdef CONFIG_GENERIC_MMC
#define mmc_host_is_spi(mmc) ((mmc)->host_caps & MMC_MODE_SPI)
--
1.7.3.rc2
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