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fusee: add support for SDMMC write operations
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parent
553cd236f2
commit
2e362d93da
2 changed files with 102 additions and 1 deletions
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@ -241,6 +241,8 @@ enum sdmmc_command {
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CMD_SET_BLKLEN = 16,
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CMD_READ_SINGLE_BLOCK = 17,
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CMD_READ_MULTIPLE_BLOCK = 18,
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CMD_WRITE_SINGLE_BLOCK = 24,
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CMD_WRITE_MULTIPLE_BLOCK = 25,
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CMD_APP_SEND_OP_COND = 41,
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CMD_APP_COMMAND = 55,
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@ -473,6 +475,10 @@ static const char *sdmmc_get_command_string(enum sdmmc_command command)
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return "CMD_APP_COMMAND";
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case CMD_APP_SEND_OP_COND:
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return "CMD_APP_SEND_OP_COND";
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case CMD_WRITE_SINGLE_BLOCK:
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return "CMD_WRITE_SINGLE_BLOCK";
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case CMD_WRITE_MULTIPLE_BLOCK:
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return "CMD_WRITE_MULTIPLE_BLOCK";
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// For commands with low numbers, read them string from the relevant array.
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default:
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@ -2242,6 +2248,9 @@ int sdmmc_init(struct mmc *mmc, enum sdmmc_controller controller)
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// Use DMA, by default.
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mmc->use_dma = true;
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// Don't allow writing unless the caller explicitly enables it.
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mmc->write_enable = SDMMC_WRITE_DISABLED;
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// Default to relative address of zero.
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mmc->relative_address = 0;
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@ -2297,7 +2306,7 @@ int sdmmc_select_partition(struct mmc *mmc, enum sdmmc_partition partition)
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/**
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* Reads a sector or sectors from a given SD card.
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* Reads a sector or sectors from a given SD/MMC card.
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*
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* @param mmc The MMC device to work with.
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* @param buffer The output buffer to target.
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@ -2323,6 +2332,62 @@ int sdmmc_read(struct mmc *mmc, void *buffer, uint32_t block, unsigned int count
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return sdmmc_send_command(mmc, command, MMC_RESPONSE_LEN48, MMC_CHECKS_ALL, extent, NULL, count, false, count > 1, buffer);
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}
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/**
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* Releases the SDMMC write lockout, enabling access to the card.
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* Note that by default, setting this to WRITE_ENABLED will not allow access to eMMC.
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* Check the source for a third constant that can be used to enable eMMC writes.
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*
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* @param perms The permissions to apply-- typically WRITE_DISABLED or WRITE_ENABLED.
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*/
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void sdmmc_set_write_enable(struct mmc *mmc, enum sdmmc_write_permission perms)
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{
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mmc->write_enable = perms;
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}
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/**
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* Writes a sector or sectors to a given SD/MMC card.
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*
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* @param mmc The MMC device to work with.
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* @param buffer The input buffer to write.
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* @param block The sector number to write from.
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* @param count The number of sectors to write.
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*
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* @return 0 on success, or an error code on failure.
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*/
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int sdmmc_write(struct mmc *mmc, void *buffer, uint32_t block, unsigned int count)
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{
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// Sanity check variables: we're especially careful about allowing writes to the switch eMMC.
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bool is_emmc = (mmc->controller == SWITCH_EMMC);
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bool allow_mmc_write = (mmc->write_enable == SDMMC_WRITE_ENABLED_INCLUDING_EMMC);
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uint32_t command = (count == 1) ? CMD_WRITE_SINGLE_BLOCK : CMD_WRITE_MULTIPLE_BLOCK;
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// Determine the argument, which indicates which address we're reading/writing.
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uint32_t extent = block;
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// If we don't have an explict write enable, don't allow writes.
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if (mmc->write_enable == SDMMC_WRITE_DISABLED) {
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mmc_print(mmc, "tried to write to an external card, but write was not enabled!");
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return EACCES;
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}
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// Explicitly protect the switch's eMMC to prevent bricks.
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if (is_emmc && !allow_mmc_write) {
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mmc_print(mmc, "cowardly refusing to write to the switch's eMMMC");
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return EACCES;
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}
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// If this card uses byte addressing rather than sector addressing,
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// multiply by the block size.
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if (!mmc->uses_block_addressing) {
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extent *= sdmmc_get_block_size(mmc, false);
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}
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// Execute the relevant read.
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return sdmmc_send_command(mmc, command, MMC_RESPONSE_LEN48, MMC_CHECKS_ALL, extent, NULL, count, true, count > 1, buffer);
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}
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/**
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* Checks to see whether an SD card is present.
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@ -71,6 +71,18 @@ enum sdmmc_controller {
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SWITCH_EMMC = 3
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};
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/**
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* Write permission modes for SD cards.
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*/
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enum sdmmc_write_permission {
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SDMMC_WRITE_DISABLED,
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SDMMC_WRITE_ENABLED,
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/* use this with the utmost caution so you don't wind up with a brick */
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SDMMC_WRITE_ENABLED_INCLUDING_EMMC,
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};
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/**
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* Primary data structure describing a Fusée MMC driver.
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@ -83,6 +95,7 @@ struct mmc {
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unsigned int timeout;
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enum sdmmc_card_type card_type;
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bool use_dma;
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enum sdmmc_write_permission write_enable;
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/* Card properties */
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uint8_t cid[15];
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@ -164,6 +177,29 @@ int sdmmc_select_partition(struct mmc *mmc, enum sdmmc_partition partition);
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int sdmmc_read(struct mmc *mmc, void *buffer, uint32_t sector, unsigned int count);
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/**
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* Releases the SDMMC write lockout, enabling access to the card.
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* Note that by default, setting this to WRITE_ENABLED will not allow access to eMMC.
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* Check the source for a third constant that can be used to enable eMMC writes.
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*
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* @param perms The permissions to apply-- typically WRITE_DISABLED or WRITE_ENABLED.
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*/
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void sdmmc_set_write_enable(struct mmc *mmc, enum sdmmc_write_permission perms);
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/**
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* Writes a sector or sectors to a given SD/MMC card.
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*
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* @param mmc The MMC device to work with.
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* @param buffer The input buffer to write.
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* @param block The sector number to write from.
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* @param count The number of sectors to write.
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*
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* @return 0 on success, or an error code on failure.
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*/
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int sdmmc_write(struct mmc *mmc, void *buffer, uint32_t block, unsigned int count);
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/**
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* Checks to see whether an SD card is present.
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*
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