diff options
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/mmc.c | 151 |
1 files changed, 150 insertions, 1 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index f78b8a8..422c6ed 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -1,5 +1,5 @@ /* - * (C) Copyright 2008-2009 Freescale Semiconductor, Inc. + * (C) Copyright 2008-2010 Freescale Semiconductor, Inc. * Terry Lv * * Copyright 2008, Freescale Semiconductor, Inc @@ -646,6 +646,149 @@ void mmc_set_bus_width(struct mmc *mmc, uint width) mmc_set_ios(mmc); } +#ifdef CONFIG_BOOT_PARTITION_ACCESS +/* Return 0/1/2 for partition id before switch; Return -1 if fail to switch */ +int mmc_switch_partition(struct mmc *mmc, uint part) +{ + char *ext_csd; + int err; + uint old_part, new_part; + char boot_config; + + /* partition must be - + 0 - user area + 1 - boot partition 1 + 2 - boot partition 2 + */ + if (part > 2) { + printf("\nWrong partition id - 0 (user area), 1 (boot1), 2 (boot2)\n"); + return 1; + } + + /* Before calling this func, "mmc" struct must have been initialized */ + if (mmc->version < MMC_VERSION_4) { + puts("Error: invalid mmc version! mmc version is below version 4!"); + return -1; + } + + if (mmc->boot_size_mult <= 0) { + /* it's a normal SD/MMC but user request to boot partition */ + printf("\nError: This is a normal SD/MMC card but you request to access boot partition\n"); + return -1; + } + + /* part must be 0 (user area), 1 (boot partition1) or 2 (boot partition2) */ + if (part > 2) { + puts("Error: partition id must be 0(user area), 1(boot partition1) or 2(boot partition2)\n"); + return -1; + } + + if (IS_SD(mmc)) { + /* eSD card hadn't been supported. Return directly without warning */ + return -1; + } + + ext_csd = (char *)malloc(512); + if (!ext_csd) { + puts("Error: Could not allocate buffer for MMC ext csd!\n"); + return -1; + } + + err = mmc_send_ext_csd(mmc, ext_csd); + if (err) { + puts("Warning: fail to get ext csd for MMC!\n"); + goto err_rtn; + } + + old_part = ext_csd[EXT_CSD_BOOT_CONFIG] & EXT_CSD_BOOT_PARTITION_ACCESS_MASK; + + /* Send SWITCH command to change partition for access */ + boot_config = (ext_csd[EXT_CSD_BOOT_CONFIG] & ~EXT_CSD_BOOT_PARTITION_ACCESS_MASK) | (char)part; + + err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_CONFIG, boot_config); + if (err) { + puts("Error: fail to send SWITCH command to card to swich partition for access!\n"); + goto err_rtn; + } + + /* Now check whether it works */ + err = mmc_send_ext_csd(mmc, ext_csd); + if (err) { + puts("Warning: fail to get ext csd for MMC!\n"); + goto err_rtn; + } + + new_part = ext_csd[EXT_CSD_BOOT_CONFIG] & EXT_CSD_BOOT_PARTITION_ACCESS_MASK; + if ((char)part != new_part) { + printf("Warning: after SWITCH, current part id %d is not same as requested partition %d!\n", + new_part, part); + goto err_rtn; + } + + /* Seems everything is ok, return the partition id before switch */ + free(ext_csd); + return old_part; + +err_rtn: + free(ext_csd); + return -1; +} + +int sd_switch_partition(struct mmc *mmc, uint part) +{ + struct mmc_cmd cmd; + int err; + + if (part > 1) { + printf("\nWrong partition id - 0 (user area), 1 (boot1)\n"); + return 1; + } + + cmd.cmdidx = SD_CMD_SELECT_PARTITION; + cmd.resp_type = MMC_RSP_R1; + cmd.cmdarg = part << 24; + cmd.flags = 0; + + err = mmc_send_cmd(mmc, &cmd, NULL); + + if (err) { + printf("Failed to switch to partition %d\nPartition not exists or command execute fail!\n"); + return -1; + } + + return 0; +} + +int mmc_get_cur_boot_partition(struct mmc *mmc) +{ + char *ext_csd; + int err; + + ext_csd = (char *)malloc(512); + + if (!ext_csd) { + puts("Error! Could not allocate buffer for MMC ext csd!\n"); + return -1; + } + + err = mmc_send_ext_csd(mmc, ext_csd); + + if (err) { + mmc->boot_config = 0; + mmc->boot_size_mult = 0; + /* continue since it's not a fatal error */ + } else { + mmc->boot_config = ext_csd[EXT_CSD_BOOT_CONFIG]; + mmc->boot_size_mult = ext_csd[EXT_CSD_BOOT_INFO]; + } + + free(ext_csd); + + return err; +} + +#endif + int mmc_startup(struct mmc *mmc) { int err; @@ -819,6 +962,7 @@ int mmc_startup(struct mmc *mmc) mmc_set_clock(mmc, 50000000); else mmc_set_clock(mmc, 25000000); + } else { if (mmc->card_caps & MMC_MODE_4BIT) { /* Set the card to use 4 bit*/ @@ -849,6 +993,10 @@ int mmc_startup(struct mmc *mmc) mmc_set_clock(mmc, 26000000); } else mmc_set_clock(mmc, 20000000); + +#ifdef CONFIG_BOOT_PARTITION_ACCESS + mmc_get_cur_boot_partition(mmc); +#endif } /* fill in device description */ @@ -1009,3 +1157,4 @@ int mmc_initialize(bd_t *bis) return 0; } + |