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From d24d6e58aa0d5d64c3d9df3fd4d20c17680a6e8e Mon Sep 17 00:00:00 2001
From: Dennis Gilmore <dennis@ausil.us>
Date: Thu, 4 Jul 2013 10:53:10 -0500
Subject: [PATCH 14/15] mmc: Add RSTN enable for emmc
eMMC has the capability of using an external RSTn line.
It has to be enabled via an access to the ECSD so add a command to do so.
Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
---
common/cmd_mmc.c | 24 ++++++++++++++++++++++++
drivers/mmc/mmc.c | 32 ++++++++++++++++++++++++++++++++
include/mmc.h | 4 ++++
3 files changed, 60 insertions(+)
diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c
index 5f1ed43..87f8577 100644
--- a/common/cmd_mmc.c
+++ b/common/cmd_mmc.c
@@ -238,6 +238,29 @@ static int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
return CMD_RET_USAGE;
print_mmc_devices('\n');
return 0;
+ } else if (strncmp(argv[1], "rstn", 4) == 0) {
+ struct mmc *mmc;
+ u8 val;
+ int err;
+
+ if (argc != 3)
+ return CMD_RET_USAGE;
+
+ val = simple_strtol(argv[2], NULL, 10);
+
+ mmc = find_mmc_device(curr_device);
+ if (!mmc) {
+ printf("no mmc device at slot %x\n", curr_device);
+ return 1;
+ }
+ err = mmc_set_rst_n(mmc, val);
+ if (err != 0) {
+ printf("failed to set RST_N to 0x%02x\n",
+ (unsigned int)val & 0xff);
+ return 1;
+ }
+
+ return 0;
} else if (strcmp(argv[1], "dev") == 0) {
int dev, part = -1;
struct mmc *mmc;
@@ -431,6 +454,7 @@ U_BOOT_CMD(
"mmc part - lists available partition on current mmc device\n"
"mmc dev [dev] [part] - show or set current mmc device [partition]\n"
"mmc list - lists available devices\n"
+ "mmc rstn - enable hardware reset of emmc\n"
#ifdef CONFIG_SUPPORT_EMMC_BOOT
"mmc open <dev> <boot_partition>\n"
" - Enable boot_part for booting and enable R/W access of boot_part\n"
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 73f7195..b866d77 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1491,6 +1491,38 @@ static void do_preinit(void)
}
+/* enable hardware reset signal */
+int mmc_set_rst_n(struct mmc *mmc, u8 val)
+{
+ ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, 512);
+ int err;
+
+ memset(ext_csd, 0, 512);
+ err = mmc_send_ext_csd(mmc, ext_csd);
+ if (err)
+ return err;
+
+ printf("before: RST_N=0x%02x\n",
+ (unsigned int)ext_csd[EXT_CSD_RST_N_FUNCTION] & 0xff);
+
+ printf("setting rstn to 0x%02x\n", (unsigned int)val & 0xff);
+
+ err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_RST_N_FUNCTION, val);
+ if (err)
+ return err;
+
+ memset(ext_csd, 0, 512);
+ err = mmc_send_ext_csd(mmc, ext_csd);
+ if (err)
+ return err;
+
+ printf("after: RST_N=0x%02x\n",
+ (unsigned int)ext_csd[EXT_CSD_RST_N_FUNCTION] & 0xff);
+
+ return 0;
+}
+
int mmc_initialize(bd_t *bis)
{
INIT_LIST_HEAD (&mmc_devices);
diff --git a/include/mmc.h b/include/mmc.h
index 583c30e..a9f68dc 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -165,6 +165,7 @@
*/
#define EXT_CSD_GP_SIZE_MULT 143 /* R/W */
#define EXT_CSD_PARTITIONING_SUPPORT 160 /* RO */
+#define EXT_CSD_RST_N_FUNCTION 162 /* R/W */
#define EXT_CSD_RPMB_MULT 168 /* RO */
#define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */
#define EXT_CSD_BOOT_BUS_WIDTH 177
@@ -178,6 +179,7 @@
#define EXT_CSD_HC_ERASE_GRP_SIZE 224 /* RO */
#define EXT_CSD_BOOT_MULT 226 /* RO */
+
/*
* EXT_CSD field definitions
*/
@@ -357,4 +359,6 @@ struct mmc *mmc_spi_init(uint bus, uint cs, uint speed, uint mode);
int mmc_legacy_init(int verbose);
#endif
+int mmc_set_rst_n(struct mmc *mmc, u8 val);
+
#endif /* _MMC_H_ */
--
1.8.3.1
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