cmd_mmc.c: Add bootbus mmc sub-command

Add a bootbus sub-command to the mmc command to allow for setting
the boot_bus_width, reset_boot_bus_width and boot_mode fields of
BOOT_BUS_WIDTH (EXT_CSD[177]).

Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Tom Rini <trini@ti.com>
Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>

diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c
index 5842e85de9f0803f915d615931a698be1d5a016e..a028149d906d72696d005ce00cfa8d489d3ca057 100644 (file)
--- a/common/cmd_mmc.c
+++ b/common/cmd_mmc.c
@@ -338,6 +338,33 @@ static int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 
                /* acknowledge to be sent during boot operation */
                return mmc_set_part_conf(mmc, ack, part_num, access);
+       } else if (strcmp(argv[1], "bootbus") == 0) {
+               int dev;
+               struct mmc *mmc;
+               u8 width, reset, mode;
+
+               if (argc == 6) {
+                       dev = simple_strtoul(argv[2], NULL, 10);
+                       width = simple_strtoul(argv[3], NULL, 10);
+                       reset = simple_strtoul(argv[4], NULL, 10);
+                       mode = simple_strtoul(argv[5], NULL, 10);
+               } else {
+                       return CMD_RET_USAGE;
+               }
+
+               mmc = find_mmc_device(dev);
+               if (!mmc) {
+                       printf("no mmc device at slot %x\n", dev);
+                       return 1;
+               }
+
+               if (IS_SD(mmc)) {
+                       puts("BOOT_BUS_WIDTH only exists on eMMC\n");
+                       return 1;
+               }
+
+               /* acknowledge to be sent during boot operation */
+               return mmc_set_boot_bus_width(mmc, width, reset, mode);
        } else if (strcmp(argv[1], "bootpart-resize") == 0) {
                int dev;
                struct mmc *mmc;
@@ -475,6 +502,8 @@ U_BOOT_CMD(
        " - Enable boot_part for booting and enable R/W access of boot_part\n"
        "mmc close <dev> <boot_partition>\n"
        " - Enable boot_part for booting and disable access to boot_part\n"
+       "mmc bootbus dev boot_bus_width reset_boot_bus_width boot_mode\n"
+       " - Set the BOOT_BUS_WIDTH field of the specified device\n"
        "mmc bootpart-resize <dev> <boot part size MB> <RPMB part size MB>\n"
        " - Change sizes of boot and RPMB partitions of specified device\n"
        "mmc partconf dev boot_ack boot_partition partition_access\n"

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 907c4185ade1941f15893911815c7328224edc17..37719d265580c05da45c528e5bad9878d31b9da5 100644 (file)
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1506,6 +1506,27 @@ int mmc_boot_part_access(struct mmc *mmc, u8 ack, u8 part_num, u8 access)
        return 0;
 }
 
+/*
+ * Modify EXT_CSD[177] which is BOOT_BUS_WIDTH
+ * based on the passed in values for BOOT_BUS_WIDTH, RESET_BOOT_BUS_WIDTH
+ * and BOOT_MODE.
+ *
+ * Returns 0 on success.
+ */
+int mmc_set_boot_bus_width(struct mmc *mmc, u8 width, u8 reset, u8 mode)
+{
+       int err;
+
+       err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_BUS_WIDTH,
+                        EXT_CSD_BOOT_BUS_WIDTH_MODE(mode) |
+                        EXT_CSD_BOOT_BUS_WIDTH_RESET(reset) |
+                        EXT_CSD_BOOT_BUS_WIDTH_WIDTH(width));
+
+       if (err)
+               return err;
+       return 0;
+}
+
 /*
  * Modify EXT_CSD[179] which is PARTITION_CONFIG (formerly BOOT_CONFIG)
  * based on the passed in values for BOOT_ACK, BOOT_PARTITION_ENABLE and

diff --git a/include/mmc.h b/include/mmc.h
index 7e026da444668ef54c8808fb2f396cc9b0582b82..3594286d42c37939acee50a8f672475f95626487 100644 (file)
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -187,6 +187,9 @@
 #define EXT_CSD_BOOT_PART_NUM(x)       (x << 3)
 #define EXT_CSD_PARTITION_ACCESS(x)    (x << 0)
 
+#define EXT_CSD_BOOT_BUS_WIDTH_MODE(x) (x << 3)
+#define EXT_CSD_BOOT_BUS_WIDTH_RESET(x)        (x << 2)
+#define EXT_CSD_BOOT_BUS_WIDTH_WIDTH(x)        (x)
 
 #define R1_ILLEGAL_COMMAND             (1 << 22)
 #define R1_APP_CMD                     (1 << 5)
@@ -314,6 +317,8 @@ int mmc_boot_partition_size_change(struct mmc *mmc, unsigned long bootsize,
 int mmc_boot_part_access(struct mmc *mmc, u8 ack, u8 part_num, u8 access);
 /* Function to modify the PARTITION_CONFIG field of EXT_CSD */
 int mmc_set_part_conf(struct mmc *mmc, u8 ack, u8 part_num, u8 access);
+/* Function to modify the BOOT_BUS_WIDTH field of EXT_CSD */
+int mmc_set_boot_bus_width(struct mmc *mmc, u8 width, u8 reset, u8 mode);
 
 /**
  * Start device initialization and return immediately; it does not block on