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fusee: implement partition support; needs some tweeks

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This commit is contained in:
Kate J. Temkin 2018-04-30 16:27:34 -06:00
parent 01e3761d4c
commit 608d59c229
2 changed files with 443 additions and 115 deletions
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526
fusee/fusee-primary/src/sdmmc.c
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@ -11,6 +11,8 @@
#define TEGRA_SDMMC_BASE (0x700B0000)
#define TEGRA_SDMMC_SIZE (0x200)
/**
* Map of tegra SDMMC registers
*/
@ -142,6 +144,7 @@ enum sdmmc_register_bits {
MMC_DATA_INHIBIT = (1 << 1),
MMC_BUFFER_WRITE_ENABLE = (1 << 10),
MMC_BUFFER_READ_ENABLE = (1 << 11),
MMC_DAT0_LINE_STATE = (1 << 20),
/* Block size register */
MMC_DMA_BOUNDARY_MAXIMUM = (0x3 << 12),
@ -160,7 +163,7 @@ enum sdmmc_register_bits {
MMC_TRANSFER_DMA_ENABLE = (1 << 0),
MMC_TRANSFER_LIMIT_BLOCK_COUNT = (1 << 1),
MMC_TRANSFER_MULTIPLE_BLOCKS = (1 << 5),
MMC_TRANSFER_AUTO_CMD12 = (1 <<2),
MMC_TRANSFER_AUTO_CMD = (0x3 << 2),
MMC_TRANSFER_CARD_TO_HOST = (1 << 4),
/* Interrupt status */
@ -205,19 +208,88 @@ enum sdmmc_command {
CMD_SET_BLKLEN = 16,
CMD_READ_SINGLE_BLOCK = 17,
CMD_READ_MULTIPLE_BLOCK = 18,
CMD_APP_CMD = 55,
};
/**
* String descriptions of each command.
*/
static const char *sdmmc_command_string[] = {
"CMD_GO_IDLE_OR_INIT",
"CMD_SEND_OPERATING_CONDITIONS",
"CMD_ALL_SEND_CID",
"CMD_SET_RELATIVE_ADDR",
"CMD_SET_DSR",
"CMD_TOGGLE_SLEEP_AWAKE",
"CMD_SWITCH_MODE",
"CMD_TOGGLE_CARD_SELECT",
"CMD_SEND_EXT_CSD",
"CMD_SEND_CSD",
"CMD_SEND_CID ",
"<unsupported>",
"CMD_STOP_TRANSMISSION",
"CMD_READ_STATUS",
"CMD_BUS_TEST",
"CMD_GO_INACTIVE",
"CMD_SET_BLKLEN",
"CMD_READ_SINGLE_BLOCK",
"CMD_READ_MULTIPLE_BLOCK",
};
/**
* Methods by which we can touch registers accessed via.
* CMD_SWITCH_MODE.
*/
enum sdmmc_switch_access_mode {
/* Normal commands */
MMC_SWITCH_MODE_CMD_SET = 0,
MMC_SWITCH_MODE_SET_BITS = 1,
MMC_SWITCH_MODE_CLEAR_BITS = 2,
MMC_SWITCH_MODE_WRITE_BYTE = 3,
/* EXTCSD access */
MMC_SWITCH_EXTCSD_NORMAL = 1,
};
/**
* Offsets into the SWITCH_MODE argument.
*/
enum sdmmc_switch_argument_offsets {
MMC_SWITCH_VALUE_SHIFT = 0,
MMC_SWITCH_FIELD_SHIFT = 16,
MMC_SWITCH_ACCESS_MODE_SHIFT = 24,
};
/**
* Fields that can be modified by CMD_SWITCH_MODE.
*/
enum sdmmc_switch_field {
/* Fields */
MMC_GROUP_ERASE_DEF = 175,
MMC_PARTITION_CONFIG = 179,
};
/**
* SDMMC command argument numbers
*/
enum sdmmc_command_magic {
MMC_EMMC_OPERATING_COND_CAPACITY_MAGIC = 0x00ff8080,
MMC_EMMC_OPERATING_COND_CAPACITY_MASK = 0x0fffffff,
MMC_EMMC_OPERATING_COND_BUSY = (0x04 << 28),
MMC_EMMC_OPERATING_COND_READY = (0x0c << 28),
MMC_EMMC_OPERATING_READINESS_MASK = (0x0f << 28),
/* READ_STATUS responses */
MMC_STATUS_MASK = (0xf << 9),
MMC_STATUS_PROGRAMMING = (0x7 << 9),
MMC_STATUS_READY_FOR_DATA = (0x1 << 8),
MMC_STATUS_CHECK_ERROR = (~0x0206BF7F),
};
@ -246,6 +318,37 @@ enum sdmmc_csd_extents {
};
/**
* Positions of the different fields in the Extended CSD.
*/
enum sdmmc_ext_csd_extents {
MMC_EXT_CSD_SIZE = 512,
/* Hardware partition registers */
MMC_EXT_CSD_PARTITION_SETTING = 155,
MMC_EXT_CSD_PARTITIONING_COMPLETE = (1 << 0),
MMC_EXT_CSD_PARTITION_ATTRIBUTE = 156,
MMC_EXT_CSD_PARTITION_ENHANCED_ATTRIBUTE = 0x1f,
MMC_EXT_CSD_PARTITION_SUPPORT = 160,
MMC_SUPPORTS_HARDWARE_PARTS = (1 << 0),
MMC_EXT_CSD_ERASE_GROUP_DEF = 175,
MMC_EXT_CSD_ERASE_GROUP_DEF_BIT = (1 << 0),
MMC_EXT_CSD_PARTITION_CONFIG = 179,
MMC_EXT_CSD_PARTITION_SELECT_MASK = 0x7,
MMC_EXT_CSD_PARTITION_SWITCH_TIME = 199,
MMC_EXT_CSD_PARTITION_SWITCH_SCALE_US = 10000,
};
/* Forward declarations. */
static int sdmmc_switch_mode(struct mmc *mmc, enum sdmmc_switch_access_mode mode, enum sdmmc_switch_field field, uint16_t value, uint32_t timeout);
/**
* Page-aligned bounce buffer to target with SDMMC DMA.
@ -282,10 +385,10 @@ void mmc_print_command_errors(struct mmc *mmc, int command_errno)
mmc_print(mmc, "ERROR: command response had invalid CRC");
if (command_errno & MMC_STATUS_COMMAND_END_BIT_ERROR)
mmc_print(mmc, "error: command response had invalid end bit");
mmc_print(mmc, "ERROR: command response had invalid end bit");
if (command_errno & MMC_STATUS_COMMAND_INDEX_ERROR)
mmc_print(mmc, "error: response appears not to be for the last issued command");
mmc_print(mmc, "ERROR: response appears not to be for the last issued command");
}
@ -305,16 +408,19 @@ static struct tegra_sdmmc *sdmmc_get_regs(enum sdmmc_controller controller)
return (struct tegra_sdmmc *)addr;
}
/**
* Performs a soft-reset of the SDMMC controller.
*
* @param mmc The MMC controller to be reset.
* @return 0 if the device successfully came out of reset; or an error code otherwise
*/
static int sdmmc_hardware_reset(struct mmc *mmc)
{
uint32_t timebase;
uint32_t timebase = get_time();
// Reset the MMC controller...
mmc->regs->software_reset |= MMC_SOFT_RESET_FULL;
timebase = get_time();
// Wait for the SDMMC controller to come back up...
while(mmc->regs->software_reset & MMC_SOFT_RESET_FULL) {
if (get_time_since(timebase) > mmc->timeout) {
@ -328,7 +434,7 @@ static int sdmmc_hardware_reset(struct mmc *mmc)
/**
*
* Initialize the low-level SDMMC hardware.
*/
static int sdmmc_hardware_init(struct mmc *mmc)
{
@ -465,6 +571,7 @@ static int sdmmc_hardware_init(struct mmc *mmc)
// Clear SDHCI_PROG_CLOCK_MODE
regs->clock_control &= ~(0x20);
// Clear SDHCI_CTRL_SDMA and SDHCI_CTRL_ADMA2
regs->host_control &= 0xE7;
@ -567,6 +674,46 @@ static int sdmmc_hardware_init(struct mmc *mmc)
return 0;
}
/*
* Blocks until the card has reached a given physical state,
* as indicated by the present state register.
*
* @param mmc The MMC controller whose state we should wait on
* @param present_state_mask A mask that indicates when we should return.
* Returns when the mask bits are no longer set in present_state if invert is true,
* or true when the mask bits are _set_ in the present state if invert is false.
*
* @return 0 on success, or an error on failure
*/
static int sdmmc_wait_for_physical_state(struct mmc *mmc, uint32_t present_state_mask, bool invert)
{
uint32_t timebase = get_time();
uint32_t condition;
// Retry until the event or an error happens
while(true) {
// Handle timeout.
if (get_time_since(timebase) > mmc->timeout) {
mmc_print(mmc, "timed out waiting for command readiness!");
return ETIMEDOUT;
}
// Read the status, and invert the condition, if necessary.
condition = mmc->regs->present_state & present_state_mask;
if (invert) {
condition = !condition;
}
// Return once our condition is met.
if (condition)
return 0;
}
}
/**
* Blocks until the SD driver is ready for a command,
* or the MMC controller's timeout interval is met.
@ -575,42 +722,67 @@ static int sdmmc_hardware_init(struct mmc *mmc)
*/
static int sdmmc_wait_for_command_readiness(struct mmc *mmc)
{
uint32_t timebase = get_time();
// Wait until we either wind up ready, or until we've timed out.
while(true) {
if (get_time_since(timebase) > mmc->timeout) {
mmc_print(mmc, "timed out waiting for command readiness!");
return ETIMEDOUT;
return sdmmc_wait_for_physical_state(mmc, MMC_COMMAND_INHIBIT, true);
}
// Wait until we're not inhibited from sending commands...
if (!(mmc->regs->present_state & MMC_COMMAND_INHIBIT))
return 0;
}
}
/**
* Blocks until the SD driver is ready to transmit data,
* or the MMC controller's timeout interval is met.
*
* @param mmc The MMC controller
* @param mmc The MMC controller whose data line we should wait for.
*/
static int sdmmc_wait_for_data_readiness(struct mmc *mmc)
{
return sdmmc_wait_for_physical_state(mmc, MMC_DATA_INHIBIT, true);
}
/**
* Blocks until the SD driver's data lines are clear,
* indicating the card is no longer busy.
*
* @param mmc The MMC controller whose data line we should wait for.
*/
static int sdmmc_wait_until_no_longer_busy(struct mmc *mmc)
{
return sdmmc_wait_for_physical_state(mmc, MMC_DAT0_LINE_STATE, false);
}
/**
* Blocks until the SD driver has completed issuing a command.
*
* @param mmc The MMC controller on which to wait.
* @param target_irq A bitmask that specifies the bits that
* will make this function return success
* @param fault_conditions A bitmask that specifies the bits that
* will make this function return EFAULT.
*
* @return 0 on sucess, EFAULT if a fault condition occurs,
* or an error code if a transfer failure occurs
*/
static int sdmmc_wait_for_interrupt(struct mmc *mmc,
uint32_t target_irq, uint32_t fault_conditions)
{
uint32_t timebase = get_time();
// Wait until we either wind up ready, or until we've timed out.
while(true) {
if (get_time_since(timebase) > mmc->timeout) {
mmc_print(mmc, "timed out waiting for command readiness!");
if (get_time_since(timebase) > mmc->timeout)
return ETIMEDOUT;
}
// Wait until we're not inhibited from sending commands...
if (!(mmc->regs->present_state & MMC_DATA_INHIBIT))
if (mmc->regs->int_status & fault_conditions)
return EFAULT;
if (mmc->regs->int_status & target_irq)
return 0;
// If an error occurs, return it.
if (mmc->regs->int_status & MMC_STATUS_ERROR_MASK)
return (mmc->regs->int_status & MMC_STATUS_ERROR_MASK);
}
}
@ -623,23 +795,7 @@ static int sdmmc_wait_for_data_readiness(struct mmc *mmc)
*/
static int sdmmc_wait_for_command_completion(struct mmc *mmc)
{
uint32_t timebase = get_time();
// Wait until we either wind up ready, or until we've timed out.
while(true) {
if (get_time_since(timebase) > mmc->timeout) {
mmc_print(mmc, "timed out waiting for command completion!");
return ETIMEDOUT;
}
// If the command completes, return that.
if (mmc->regs->int_status & MMC_STATUS_COMMAND_COMPLETE)
return 0;
// If an error occurs, return it.
if (mmc->regs->int_status & MMC_STATUS_ERROR_MASK)
return (mmc->regs->int_status & MMC_STATUS_ERROR_MASK);
}
return sdmmc_wait_for_interrupt(mmc, MMC_STATUS_COMMAND_COMPLETE, 0);
}
@ -650,29 +806,7 @@ static int sdmmc_wait_for_command_completion(struct mmc *mmc)
*/
static int sdmmc_wait_for_transfer_completion(struct mmc *mmc)
{
uint32_t timebase = get_time();
// Wait until we either wind up ready, or until we've timed out.
while(true) {
if (get_time_since(timebase) > mmc->timeout)
return -ETIMEDOUT;
// If the command completes, return that.
if (mmc->regs->int_status & MMC_STATUS_TRANSFER_COMPLETE)
return 0;
// If we've hit a DMA page boundary, fault.
if (mmc->regs->int_status & MMC_STATUS_DMA_INTERRUPT) {
mmc_print(mmc, "transaction would overrun the DMA buffer!");
return -EFAULT;
}
// If an error occurs, return it.
if (mmc->regs->int_status & MMC_STATUS_ERROR_MASK)
return (mmc->regs->int_status & MMC_STATUS_ERROR_MASK) >> 16;
}
return sdmmc_wait_for_interrupt(mmc, MMC_STATUS_TRANSFER_COMPLETE, MMC_STATUS_DMA_INTERRUPT);
}
@ -766,8 +900,11 @@ static int sdmmc_handle_cpu_transfer(struct mmc *mmc, uint16_t blocks, bool is_w
* @param mmc The device to be used to transmit.
* @param blocks The total number of blocks to be transferred.
* @param is_write True iff we're sending data _to_ the card.
* @param auto_termiante True iff we should instruct the system
* to reclaim the data lines after a transaction.
*/
static void sdmmc_prepare_command_data(struct mmc *mmc, uint16_t blocks, bool is_write, int argument)
static void sdmmc_prepare_command_data(struct mmc *mmc, uint16_t blocks,
bool is_write, bool auto_terminate, int argument)
{
if (blocks) {
uint16_t block_size = sdmmc_get_block_size(mmc, is_write);
@ -785,9 +922,8 @@ static void sdmmc_prepare_command_data(struct mmc *mmc, uint16_t blocks, bool is
// Populate the command argument.
mmc->regs->argument = argument;
// Always use DMA mode for data, as that's what Nintendo does. :)
if (blocks) {
uint32_t to_write = MMC_TRANSFER_LIMIT_BLOCK_COUNT;
uint32_t to_write = MMC_TRANSFER_LIMIT_BLOCK_COUNT | MMC_TRANSFER_AUTO_CMD;
// If this controller should use DMA, set that up.
if (mmc->use_dma)
@ -796,7 +932,7 @@ static void sdmmc_prepare_command_data(struct mmc *mmc, uint16_t blocks, bool is
// If this is a multi-block datagram, indicate so.
// Also, configure the host to automatically stop the card when transfers are complete.
if (blocks > 1)
to_write |= (MMC_TRANSFER_MULTIPLE_BLOCKS | MMC_TRANSFER_AUTO_CMD12);
to_write |= MMC_TRANSFER_MULTIPLE_BLOCKS;
// If this is a read, set the READ mode.
if (!is_write)
@ -865,29 +1001,39 @@ static void sdmmc_enable_interrupts(struct mmc *mmc, bool enabled)
* Handle the response to an SDMMC command, copying the data
* from the SDMMC response holding area to the user-provided response buffer.
*/
static void sdmmc_handle_command_response(struct mmc *mmc,
static int sdmmc_handle_command_response(struct mmc *mmc,
enum sdmmc_response_type type, void *response_buffer)
{
uint32_t *buffer = (uint32_t *)response_buffer;
int rc;
// If we don't have a place to put the response,
// skip copying it out.
if (!response_buffer) {
return;
}
if (!response_buffer)
return 0;
switch(type) {
// Easy case: we don't have a response. We don't need to do anything.
case MMC_RESPONSE_NONE:
break;
// If we have a response we have to wait on busy-completion for,
// wait for the DAT0 line to clear.
case MMC_RESPONSE_LEN48_CHK_BUSY:
mmc_print(mmc, "waiting for card to stop being busy...");
rc = sdmmc_wait_until_no_longer_busy(mmc);
if (rc) {
mmc_print(mmc, "failure waiting for card to finish being busy (%d)", rc);
return rc;
}
// (fall-through)
// If we have a 48-bit response, then we have 32 bits of response and 16 bits of CRC/command.
// The naming is a little odd, but that's thanks to the SDMMC standard.
case MMC_RESPONSE_LEN48:
case MMC_RESPONSE_LEN48_CHK_BUSY:
*buffer = mmc->regs->response[0];
mmc_print(mmc, "response: %08x", *buffer);
break;
// If we have a 136-bit response, we have 128 of response and 8 bits of CRC.
@ -898,13 +1044,13 @@ static void sdmmc_handle_command_response(struct mmc *mmc,
// We avoid memcpy here, because this is volatile.
for(int i = 0; i < 4; ++i)
buffer[i] = mmc->regs->response[i];
mmc_print(mmc, "response: %08x%08x%08x%08x", buffer[0], buffer[1], buffer[2], buffer[3]);
break;
default:
mmc_print(mmc, "invalid response type; not handling response");
}
return 0;
}
@ -929,7 +1075,7 @@ static void sdmmc_handle_command_response(struct mmc *mmc,
static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
enum sdmmc_response_type response_type, enum sdmmc_response_checks checks,
uint32_t argument, void *response_buffer, uint16_t blocks_to_transfer,
bool is_write, void *data_buffer)
bool is_write, bool auto_terminate, void *data_buffer)
{
uint32_t total_data_to_xfer = sdmmc_get_block_size(mmc, is_write) * blocks_to_transfer;
int rc;
@ -953,8 +1099,8 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
return -EBUSY;
}
// If this is a data command, wait until we can use the data lines.
if (blocks_to_transfer) {
// If this is a data command, or a command that uses the data lines for busy-detection.
if (blocks_to_transfer || (response_type == MMC_RESPONSE_LEN48_CHK_BUSY)) {
rc = sdmmc_wait_for_data_readiness(mmc);
if (rc) {
mmc_print(mmc, "card not willing to accept data-commands (%d / %08x)", rc, mmc->regs->present_state);
@ -963,7 +1109,7 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
}
// If we have data to send, prepare it.
sdmmc_prepare_command_data(mmc, blocks_to_transfer, is_write, argument);
sdmmc_prepare_command_data(mmc, blocks_to_transfer, is_write, auto_terminate, argument);
// If this is a write and we have data, we'll need to populate the bounce buffer before
// issuing the command.
@ -980,7 +1126,7 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
// Wait for the command to be completed.
rc = sdmmc_wait_for_command_completion(mmc);
if (rc) {
mmc_print(mmc, "failed to issue CMD%d (%d / %08x)", command, rc, mmc->regs->int_status);
mmc_print(mmc, "failed to issue CMD%d (arg=%08x, rc=%d)", command, argument, rc);
mmc_print_command_errors(mmc, rc);
sdmmc_enable_interrupts(mmc, false);
@ -988,7 +1134,11 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
}
// Copy the response received to the output buffer, if applicable.
sdmmc_handle_command_response(mmc, response_type, response_buffer);
rc = sdmmc_handle_command_response(mmc, response_type, response_buffer);
if (rc) {
mmc_print(mmc, "failed to handle CMD%d response! (%d)", rc);
return rc;
}
// If we had a data stage, handle it.
if (blocks_to_transfer) {
@ -997,7 +1147,6 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
if (mmc->use_dma) {
// Wait for the transfer to be complete...
mmc_print(mmc, "waiting for transfer completion...");
rc = sdmmc_wait_for_transfer_completion(mmc);
if (rc) {
mmc_print(mmc, "failed to complete CMD%d data stage via DMA (%d)", command, rc);
@ -1013,7 +1162,6 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
}
// Otherwise, perform the transfer using the CPU.
else {
mmc_print(mmc, "transferring data...");
rc = sdmmc_handle_cpu_transfer(mmc, blocks_to_transfer, is_write, data_buffer);
if (rc) {
mmc_print(mmc, "failed to complete CMD%d data stage via CPU (%d)", command, rc);
@ -1027,7 +1175,7 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
// (This is mostly for when the GIC is brought up)
sdmmc_enable_interrupts(mmc, false);
mmc_print(mmc, "CMD%d success!", command);
mmc_print(mmc, "completed %s.", sdmmc_command_string[command]);
return 0;
}
@ -1050,7 +1198,7 @@ static int sdmmc_send_simple_command(struct mmc *mmc, enum sdmmc_command command
enum sdmmc_response_checks checks = (response_type == MMC_RESPONSE_NONE) ? MMC_CHECKS_NONE : MMC_CHECKS_ALL;
// Deletegate the full checks function.
return sdmmc_send_command(mmc, command, response_type, checks, argument, response_buffer, 0, 0, NULL);
return sdmmc_send_command(mmc, command, response_type, checks, argument, response_buffer, 0, false, false, NULL);
}
@ -1080,7 +1228,8 @@ static int emmc_card_init(struct mmc *mmc)
uint32_t response_masked;
// Ask the SD card to identify its state. It will respond with readiness and a capacity magic.
rc = sdmmc_send_command(mmc, CMD_SEND_OPERATING_CONDITIONS, MMC_RESPONSE_LEN48, MMC_CHECKS_NONE, 0x40000080, response, 0, 0, NULL);
rc = sdmmc_send_command(mmc, CMD_SEND_OPERATING_CONDITIONS, MMC_RESPONSE_LEN48,
MMC_CHECKS_NONE, 0x40000080, response, 0, false, false, NULL);
if (rc) {
mmc_print(mmc, "ERROR: could not read the card's operating conditions!");
return rc;
@ -1169,11 +1318,6 @@ static int sdmmc_parse_csd_version1(struct mmc *mmc, uint32_t *csd)
mmc->read_block_order = sdmmc_extract_csd_bits(csd, MMC_CSD_V1_READ_BL_LENGTH_START, MMC_CSD_V1_READ_BL_LENGTH_WIDTH);
// TODO: handle other attributes
// Print a summary of the read CSD.
mmc_print(mmc, "CSD summary:");
mmc_print(mmc, " read_block_order: %d", mmc->read_block_order);
return 0;
}
@ -1225,28 +1369,27 @@ static int sdmmc_read_and_parse_csd(struct mmc *mmc)
static int sdmmc_read_and_parse_ext_csd(struct mmc *mmc)
{
int rc;
uint8_t ext_csd[512];
uint8_t ext_csd[MMC_EXT_CSD_SIZE];
// Read the single EXT CSD block.
// FIXME: support block sizes other than 512B?
rc = sdmmc_send_command(mmc, CMD_SEND_EXT_CSD, MMC_RESPONSE_LEN48, MMC_CHECKS_ALL, 0, NULL, 1, false, ext_csd);
rc = sdmmc_send_command(mmc, CMD_SEND_EXT_CSD, MMC_RESPONSE_LEN48,
MMC_CHECKS_ALL, 0, NULL, 1, false, true, ext_csd);
if (rc) {
mmc_print(mmc, "ERROR: failed to read the extended CSD!");
return rc;
}
// Parse the extended CSD here.
mmc_print(mmc, "extended CSD looks like:");
for (int i = 0; i < 64; ++i) {
/**
* Parse the extended CSD:
*/
if(i % 8 == 0) {
printk("\n");
}
// Hardware partition support.
mmc->partition_support = ext_csd[MMC_EXT_CSD_PARTITION_SUPPORT];
mmc->partition_config = ext_csd[MMC_EXT_CSD_PARTITION_CONFIG] & ~MMC_EXT_CSD_PARTITION_SELECT_MASK;
mmc->partition_switch_time = ext_csd[MMC_EXT_CSD_PARTITION_SWITCH_TIME] * MMC_EXT_CSD_PARTITION_SWITCH_SCALE_US;
mmc->partition_setting = ext_csd[MMC_EXT_CSD_PARTITION_SETTING];
mmc->partition_attribute = ext_csd[MMC_EXT_CSD_PARTITION_ATTRIBUTE];
printk("%02x ", ext_csd[i]);
}
printk("\n");
return 0;
}
@ -1283,6 +1426,31 @@ static int sdmmc_optimize_transfer_mode(struct mmc *mmc)
}
/**
* Retrieves information about the card, and populates the MMC structure accordingly.
* Used as part of the SDMMC initialization process.
*/
static int sdmmc_set_up_partitions(struct mmc *mmc)
{
bool partitions_exist = mmc->partition_setting & MMC_EXT_CSD_PARTITIONING_COMPLETE;
bool has_enhanced_attributes = mmc->partition_attribute & MMC_EXT_CSD_PARTITION_ENHANCED_ATTRIBUTE;
// If the card doesn't support partitions, fail out.
if (!(mmc->partition_support & MMC_SUPPORTS_HARDWARE_PARTS))
return ENOTTY;
// If the card hasn't been partitioned, fail out.
// We don't support setting up hardware partitioning.
if (!partitions_exist || !has_enhanced_attributes)
return ENOTDIR;
mmc_print(mmc, "detected a card with hardware (boot) partitions.");
// Use partitioning.
return sdmmc_switch_mode(mmc, MMC_SWITCH_EXTCSD_NORMAL,
MMC_GROUP_ERASE_DEF, MMC_EXT_CSD_ERASE_GROUP_DEF_BIT, mmc->timeout);
}
/**
* Retrieves information about the card, and populates the MMC structure accordingly.
@ -1344,7 +1512,13 @@ static int sdmmc_card_init(struct mmc *mmc)
return EPIPE;
}
return rc;
// Set up MMC card partitioning, if supported.
rc = sdmmc_set_up_partitions(mmc);
if (rc) {
mmc_print(mmc, "NOTE: card cannot be used with hardware partitions (%d)", rc);
}
return 0;
}
@ -1427,6 +1601,134 @@ int sdmmc_init(struct mmc *mmc, enum sdmmc_controller controller)
}
/**
* @returns true iff the given READ_STATUS response indicates readiness
*/
static bool sdmmc_status_indicates_readiness(uint32_t status)
{
// If the card is currently programming, it's not ready.
if ((status & MMC_STATUS_MASK) == MMC_STATUS_PROGRAMMING)
return false;
// Return true iff the card is ready for data.
return status & MMC_STATUS_READY_FOR_DATA;
}
/**
* Waits for card readiness; should be issued after e.g. enabling partitioning.
*
* @param mmc The MMC to wait on.
* @param 0 if the wait completed with the card being ready; or an error code otherwise
*/
static int sdmmc_wait_for_card_ready(struct mmc *mmc, uint32_t timeout)
{
int rc;
uint32_t status;
uint32_t timebase = get_time();
while(true) {
// Read the card's status.
rc = sdmmc_send_simple_command(mmc, CMD_READ_STATUS, MMC_RESPONSE_LEN48, mmc->relative_address << 16, &status);
// Ensure we haven't timed out.
if (get_time_since(timebase) > timeout)
return ETIMEDOUT;
// If we couldn't read, try again.
if (rc)
continue;
// Check to see if we hit a fatal error.
if (status & MMC_STATUS_CHECK_ERROR)
return EPIPE;
// Check for ready status.
if (sdmmc_status_indicates_readiness(status))
return 0;
}
}
/**
* Issues a SWITCH_MODE command, which can be used to write registers on the MMC card's controller,
* and thus to e.g. switch partitions.
*
* @param mmc The MMC device to use for comms.
* @param mode The access mode with which to access the controller.
* @param field The field to access.
* @param value The argument to the access mode.
* @param timeout The timeout, which is often longer than the normal MMC timeout.
*
* @return 0 on success, or an error code on failure
*/
static int sdmmc_switch_mode(struct mmc *mmc, enum sdmmc_switch_access_mode mode, enum sdmmc_switch_field field, uint16_t value, uint32_t timeout)
{
// Collapse our various parameters into a single argument.
uint32_t argument =
(mode << MMC_SWITCH_ACCESS_MODE_SHIFT) |
(field << MMC_SWITCH_FIELD_SHIFT) |
(value << MMC_SWITCH_VALUE_SHIFT);
// Issue the switch mode command.
int rc = sdmmc_send_simple_command(mmc, CMD_SWITCH_MODE, MMC_RESPONSE_LEN48_CHK_BUSY, argument, NULL);
if (rc){
mmc_print(mmc, "failed to issue SWITCH_MODE command! (%d / %d / %d; rc=%d)", mode, field, value, rc);
return rc;
}
// Wait until we have a sense of the card status to return.
rc = sdmmc_wait_for_card_ready(mmc, timeout);
if (rc){
mmc_print(mmc, "failed to talk to the card after SWITCH_MODE (%d)", rc);
return rc;
}
return 0;
}
/**
* @return True iff the given MMC card supports hardare partitions.
*/
static bool sdmmc_supports_hardware_partitions(struct mmc *mmc)
{
return mmc->partition_support & MMC_SUPPORTS_HARDWARE_PARTS;
}
/**
* Selects the active MMC partition. Can be used to select
* boot partitions for access. Affects all operations going forward.
*
* @param mmc The MMC controller whose card is to be used.
* @param partition The partition number to be selected.
*
* @return 0 on success, or an error code on failure.
*/
int sdmmc_select_partition(struct mmc *mmc, enum sdmmc_partition partition)
{
uint16_t argument = mmc->partition_config | partition;
int rc;
// If we're trying to access hardware partitions on a device that doesn't support them,
// bail out.
if (!sdmmc_supports_hardware_partitions(mmc))
return ENOTTY;
// Set the PARTITION_CONFIG register to select the active partition.
mmc_print(mmc, "switching to partition %d", partition);
rc = sdmmc_switch_mode(mmc, MMC_SWITCH_EXTCSD_NORMAL, MMC_PARTITION_CONFIG, argument, mmc->partition_switch_time);
if (rc) {
mmc_print(mmc, "failed to select partition %d (%02x, rc=%d)", partition, argument, rc);
}
return rc;
}
/**
* Reads a sector or sectors from a given SD card.
*
@ -1452,5 +1754,5 @@ int sdmmc_read(struct mmc *mmc, void *buffer, uint32_t block, unsigned int count
}
// Execute the relevant read.
return sdmmc_send_command(mmc, command, MMC_RESPONSE_LEN48, MMC_CHECKS_ALL, extent, NULL, count, false, buffer);
return sdmmc_send_command(mmc, command, MMC_RESPONSE_LEN48, MMC_CHECKS_ALL, extent, NULL, count, false, true, buffer);
}

28
fusee/fusee-primary/src/sdmmc.h
View file

@ -27,7 +27,6 @@ struct mmc {
/* Controller properties */
char *name;
unsigned int timeout;
enum mmc_card_type card_type;
bool use_dma;
@ -35,6 +34,12 @@ struct mmc {
uint8_t cid[15];
uint32_t relative_address;
uint8_t partition_support;
uint8_t partition_config;
uint8_t partition_setting;
uint8_t partition_attribute;
uint32_t partition_switch_time;
uint8_t read_block_order;
bool uses_block_addressing;
@ -52,6 +57,15 @@ enum sdmmc_controller {
};
/**
* Parititions supported by the Switch eMMC.
*/
enum sdmmc_partition {
MMC_PARTITION_USER = 0,
MMC_PARTITION_BOOT1 = 1,
MMC_PARITTION_BOOT2 = 2,
};
/**
* Initiailzes an SDMMC controller for use with an eMMC or SD card device.
@ -62,6 +76,18 @@ enum sdmmc_controller {
int sdmmc_init(struct mmc *mmc, enum sdmmc_controller controller);
/**
* Selects the active MMC partition. Can be used to select
* boot partitions for access. Affects all operations going forward.
*
* @param mmc The MMC controller whose card is to be used.
* @param partition The partition number to be selected.
*
* @return 0 on success, or an error code on failure.
*/
int sdmmc_select_partition(struct mmc *mmc, enum sdmmc_partition partition);
/**
* Reads a sector or sectors from a given SD card.
*