mmc: Support FFU for Samsung eMMC v4.5

This change adds support to field firmware update (ffu) for Samsung emmc v4.5.

Samsung eMMC 4.5 FFU protocol is similar with eMMC 5.0 FFU without MODE_OPERATION.
It uses the different EXT_CSD offset.

This patch depends on patch mmc: Support-FFU-for-eMMC-v5.0 committed by Avi Shchislowski <[email protected]>

---
 drivers/mmc/card/Kconfig |   9 +++++
 drivers/mmc/card/block.c |   8 ++++
 drivers/mmc/card/ffu.c   | 100
+++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mmc/ffu.h  |  14 +++++++
 4 files changed, 131 insertions(+)

drivers/mmc/card/Kconfig +0 -0

index d1ea14f..4b0126d 100644
@@ -76,3 +76,12 @@ config MMC_FFU
          This is an option to run firmware update on eMMC 5.0.
          Field firmware updates (FFU) enables features enhancement

drivers/mmc/card/block.c +8 -0

index e50cded..ca8ba57 100644
@@ -536,6 +536,14 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
                goto cmd_rel_host;
        }
 
+#ifdef CONFIG_MMC_FFU_SAMSUNG45
+       if (cmd.opcode == MMC_FFU_SAMSUNG45_OP) {
+               err = mmc_ffu_execute(card, &cmd, idata->buf,
+                               idata->buf_bytes);
+               goto cmd_rel_host;
+       }
+#endif
+
        err = mmc_blk_part_switch(card, md);
        if (err)
                goto cmd_rel_host;

drivers/mmc/card/ffu.c +22 -0

index 092a791..a5eed6c 100644
@@ -608,3 +608,103 @@ exit:
 }
 EXPORT_SYMBOL(mmc_ffu_install);
 
+#ifdef CONFIG_MMC_FFU_SAMSUNG45
+
+#define EXT_CSD_MODE_CONFIG_SAMSUNG45  133
+#define EXT_CSD_FFU_STATUS_SAMSUNG45   253
+
+int mmc_ffu_execute(struct mmc_card *card, struct mmc_command *cmd,
+       u8 *data, int buf_bytes)
+{
+       u8 ext_csd[CARD_BLOCK_SIZE];
+       int err;
+       int ret = 0;
+
+       /* Read the EXT_CSD */
+       err = mmc_send_ext_csd(card, ext_csd);
+       if (err) {
+               u32 status;
+               pr_err("FFU: %s: error %d sending ext_csd\n",
+                       mmc_hostname(card->host), err);
+               goto exit;
+       }
+
+       /*

drivers/mmc/card/ffu.c +68 -0

+
+       /* Check if FFU is supported by card */
+       if (!FFU_SUPPORTED_MODE(ext_csd[EXT_CSD_SUPPORTED_MODE])) {
+               err = -EINVAL;
+               pr_err("FFU: %s: error %d FFU is not supported\n",
+                       mmc_hostname(card->host), err);
+               goto exit;
+       }
+
+       if (FFU_ENABLED(ext_csd[EXT_CSD_FW_CONFIG])) {
+               err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+                       EXT_CSD_FW_CONFIG, MMC_FFU_ENABLE,
+                       card->ext_csd.generic_cmd6_time);
+               if (err) {
+                       pr_err("%s: switch to FFU failed with error %d\n",
+                               mmc_hostname(card->host), err);
+                       return err;
+               }
+       }
+
+       /* set device to FFU mode */
+       err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+               EXT_CSD_MODE_CONFIG_SAMSUNG45, MMC_FFU_MODE_SET,
+               card->ext_csd.generic_cmd6_time);
+       if (err) {
+               pr_err("FFU: %s: error %d FFU is not supported\n",
+                       mmc_hostname(card->host), err);
+               goto exit;
+       }
+       cmd->arg = 0xc7810000;
+
+       err = mmc_ffu_write(card, data, cmd->arg, buf_bytes);
+
+       /* host switch back to work in normal MMC Read/Write commands */
+       ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+               EXT_CSD_MODE_CONFIG_SAMSUNG45, MMC_FFU_MODE_NORMAL,
+               card->ext_csd.generic_cmd6_time);
+       if (ret)
+               err = ret;
+
+       /* read ext_csd */
+       err = mmc_send_ext_csd(card, ext_csd);
+       if (err) {
+               pr_err("FFU: %s: error %d sending ext_csd\n",
+               mmc_hostname(card->host), err);
+               goto exit;
+       }
+
+       /* return status */
+       err = ext_csd[EXT_CSD_FFU_STATUS_SAMSUNG45];
+       if (!err) {
+               pr_err("FFU: %s: error %d FFU execute:\n",
+                       mmc_hostname(card->host), err);
+               err = -EINVAL;
+               goto exit;
+       }
+       err = mmc_ffu_restart(card);
+       if (err) {
+               pr_err("FFU: %s: error %d FFU execute:\n",
+                       mmc_hostname(card->host), err);
+       }
+exit:
+       return err;
+}
+EXPORT_SYMBOL(mmc_ffu_execute);
+
+#endif
+

include/linux/mmc/ffu.h +14 -1

index 009e98b..abf56e6 100644
@@ -27,6 +27,9 @@
  */
 #define MMC_FFU_DOWNLOAD_OP 302
 #define MMC_FFU_INSTALL_OP 303
+#ifdef CONFIG_MMC_FFU_SAMSUNG45
+#define MMC_FFU_SAMSUNG45_OP 304
+#endif
 
 #define MMC_FFU_MODE_SET 0x1
 #define MMC_FFU_MODE_NORMAL 0x0

@@ -47,6 +50,10 @@
 int mmc_ffu_download(struct mmc_card *card, struct mmc_command *cmd,
        u8 *data, int buf_bytes);
 int mmc_ffu_install(struct mmc_card *card);
+#ifdef CONFIG_MMC_FFU_SAMSUNG45
+int mmc_ffu_execute(struct mmc_card *card, struct mmc_command *cmd,
+       u8 *data, int buf_bytes);
+#endif
 #else
 static inline int mmc_ffu_download(struct mmc_card *card,
        struct mmc_command *cmd, u8 *data, int buf_bytes)

@@ -57,6 +64,13 @@ static inline int mmc_ffu_install(struct mmc_card *card)
 {
        return -ENOSYS;
 }
+#ifdef CONFIG_MMC_FFU_SAMSUNG45
+static inline int mmc_ffu_execute(struct mmc_card *card,
+       struct mmc_command *cmd, u8 *data, int buf_bytes)
+{
+       return -ENOSYS;
+}
+#endif
 
 #endif
 #endif /* FFU_H_ */
--

1.8.3.2

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