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Use latest sdmmc driver in stage2

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This commit is contained in:
TuxSH 2018-05-09 18:01:51 +02:00
parent 694289de0b
commit 7ad818ed93
2 changed files with 310 additions and 199 deletions
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404
fusee/fusee-secondary/src/sdmmc.c
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@ -2,6 +2,7 @@
* Fusée SD/MMC driver for the Switch
* ~ktemkin
*/
#include <string.h>
#include <stdint.h>
#include <errno.h>
@ -171,7 +172,9 @@ 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_CMD_MASK = (0x3 << 2),
MMC_TRANSFER_AUTO_CMD = (0x3 << 2),
MMC_TRANSFER_AUTO_CMD12 = (0x1 << 2),
MMC_TRANSFER_CARD_TO_HOST = (1 << 4),
/* Interrupt status */
@ -238,11 +241,14 @@ enum sdmmc_command {
CMD_SET_BLKLEN = 16,
CMD_READ_SINGLE_BLOCK = 17,
CMD_READ_MULTIPLE_BLOCK = 18,
CMD_WRITE_SINGLE_BLOCK = 24,
CMD_WRITE_MULTIPLE_BLOCK = 25,
CMD_APP_SEND_OP_COND = 41,
CMD_APP_COMMAND = 55,
};
/**
* String descriptions of each command.
*/
@ -269,44 +275,6 @@ static const char *sdmmc_command_string[] = {
};
/**
* 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,
MMC_BUS_WIDTH = 183,
};
/**
* SDMMC command argument numbers
*/
@ -392,9 +360,6 @@ enum sdmmc_ext_csd_extents {
};
/* 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);
/* SDMMC debug enable */
static int sdmmc_loglevel = 0;
@ -470,6 +435,10 @@ static const char *sdmmc_get_command_string(enum sdmmc_command command)
return "CMD_APP_COMMAND";
case CMD_APP_SEND_OP_COND:
return "CMD_APP_SEND_OP_COND";
case CMD_WRITE_SINGLE_BLOCK:
return "CMD_WRITE_SINGLE_BLOCK";
case CMD_WRITE_MULTIPLE_BLOCK:
return "CMD_WRITE_MULTIPLE_BLOCK";
// For commands with low numbers, read them string from the relevant array.
default:
@ -477,6 +446,7 @@ static const char *sdmmc_get_command_string(enum sdmmc_command command)
}
}
/**
* Debug: print out any errors that occurred during a command timeout
*/
@ -539,7 +509,7 @@ static int sdmmc_hardware_reset(struct mmc *mmc)
/**
* Performs low-level initialization for SDMMC4, used for the eMMC.
*/
static int sdmmc4_hardware_init(struct mmc *mmc)
static int sdmmc4_set_up_clock_and_io(struct mmc *mmc)
{
volatile struct tegra_car *car = car_get_regs();
volatile struct tegra_padctl *padctl = padctl_get_regs();
@ -573,6 +543,16 @@ static int sdmmc4_hardware_init(struct mmc *mmc)
}
/**
* Enables power supplies for SDMMC4, used for eMMC.
*/
static int sdmmc4_enable_supplies(struct mmc *mmc)
{
// As a booot device, SDMMC4's power supply is always on.
return 0;
}
/**
* Enables power supplies for SDMMC1, used for the SD card slot.
*/
@ -602,7 +582,7 @@ static int sdmmc1_enable_supplies(struct mmc *mmc)
/**
* Performs low-level initialization for SDMMC1, used for the SD card slot.
*/
static int sdmmc1_hardware_init(struct mmc *mmc)
static int sdmmc1_set_up_clock_and_io(struct mmc *mmc)
{
volatile struct tegra_car *car = car_get_regs();
volatile struct tegra_pinmux *pinmux = pinmux_get_regs();
@ -659,49 +639,6 @@ static int sdmmc1_hardware_init(struct mmc *mmc)
}
/**
* Sets up the I/O and clocking resources necessary to use the given controller.
*/
static int sdmmc_setup_controller_clock_and_io(struct mmc *mmc)
{
// Always use the per-controller initialization functions.
switch (mmc->controller) {
case SWITCH_MICROSD:
return sdmmc1_hardware_init(mmc);
case SWITCH_EMMC:
return sdmmc4_hardware_init(mmc);
default:
mmc_print(mmc, "initializing an unsupport SDMMC controller!");
return ENODEV;
}
return 0;
}
/**
* Sets up the I/O and clocking resources necessary to use the given controller.
*/
static int sdmmc_enable_supplies(struct mmc *mmc)
{
// Always use the per-controller initialization functions.
switch (mmc->controller) {
case SWITCH_MICROSD:
return sdmmc1_enable_supplies(mmc);
// As a boot device, the eMMC is always on.
case SWITCH_EMMC:
return 0;
default:
mmc_print(mmc, "trying to power on an unsupported controller!");
return ENODEV;
}
return 0;
}
/**
* Configures clocking parameters for a given controller.
*
@ -709,6 +646,8 @@ static int sdmmc_enable_supplies(struct mmc *mmc)
*/
static int sdmmc_set_up_clocking_parameters(struct mmc *mmc)
{
// TODO: decide if these should be split into separate functions after seeing how much
// is common to the tunable modes
// TODO: timing for HS400/HS667 modes
// TODO: timing for tuanble modes (SDR50/104/200)
@ -739,8 +678,6 @@ static int sdmmc_set_up_clocking_parameters(struct mmc *mmc)
}
/**
* Initialize the low-level SDMMC hardware.
* Thanks to hexkyz for this init code.
@ -757,7 +694,7 @@ static int sdmmc_hardware_init(struct mmc *mmc)
int rc;
// Initialize the Tegra resources necessary to use the given piece of hardware.
rc = sdmmc_setup_controller_clock_and_io(mmc);
rc = mmc->set_up_clock_and_io(mmc);
if (rc) {
mmc_print(mmc, "ERROR: could not set up controller for use!");
return rc;
@ -771,7 +708,7 @@ static int sdmmc_hardware_init(struct mmc *mmc)
}
// Turn on the card's power supplies...
rc = sdmmc_enable_supplies(mmc);
rc = mmc->enable_supplies(mmc);
if (rc) {
mmc_print(mmc, "ERROR: could power on the card!");
return rc;
@ -891,12 +828,6 @@ static int sdmmc_hardware_init(struct mmc *mmc)
// Ensure we're using Single-operation DMA (SDMA) mode for DMA.
regs->host_control &= ~MMC_DMA_SELECT_MASK;
// ... and verify that the card is there.
if (!sdmmc_card_present(mmc)) {
mmc_print(mmc, "ERROR: no card detected!");
return ENODEV;
}
return 0;
}
@ -1149,17 +1080,21 @@ static void sdmmc_prepare_command_data(struct mmc *mmc, uint16_t blocks,
mmc->regs->argument = argument;
if (blocks) {
uint32_t to_write = MMC_TRANSFER_LIMIT_BLOCK_COUNT | MMC_TRANSFER_AUTO_CMD;
uint32_t to_write = MMC_TRANSFER_LIMIT_BLOCK_COUNT;
// If this controller should use DMA, set that up.
if (mmc->use_dma)
to_write |= MMC_TRANSFER_DMA_ENABLE;
// 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;
// If this command should automatically terminate, set the host to
// terminate it after the block span is complete.
if (auto_terminate)
to_write |= MMC_TRANSFER_AUTO_CMD12;
// If this is a read, set the READ mode.
if (!is_write)
to_write |= MMC_TRANSFER_CARD_TO_HOST;
@ -1293,6 +1228,7 @@ static int sdmmc_handle_command_response(struct mmc *mmc,
* @param blocks_to_transfer The number of SDMMC blocks to be transferred with the given command,
* or 0 to indicate that this command should not expect response data.
* @param is_write True iff the given command issues data _to_ the card, instead of vice versa.
* @param auto_terminate True iff the gven command needs to be terminated with e.g. CMD12
* @param data_buffer A byte buffer that either contains the data to be sent, or which should
* receive data, depending on the is_write argument.
*
@ -1362,7 +1298,7 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
// Copy the response received to the output buffer, if applicable.
rc = sdmmc_handle_command_response(mmc, response_type, response_buffer);
if (rc) {
mmc_print(mmc, "failed to handle CMD%d response! (%d)", rc);
mmc_print(mmc, "failed to handle %s response! (%d)", sdmmc_get_command_string(command), rc);
return rc;
}
@ -1375,7 +1311,7 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
// Wait for the transfer to be complete...
rc = sdmmc_wait_for_transfer_completion(mmc);
if (rc) {
mmc_print(mmc, "failed to complete CMD%d data stage via DMA (%d)", command, rc);
mmc_print(mmc, "failed to complete %s data stage via DMA (%d)", sdmmc_get_command_string(command), command, rc);
sdmmc_enable_interrupts(mmc, false);
return rc;
}
@ -1571,7 +1507,6 @@ static int sdmmc_read_and_parse_csd(struct mmc *mmc)
}
/**
* Reads the active MMC card's Card Specific Data, and updates the MMC object's properties.
*
@ -1585,7 +1520,7 @@ static int sdmmc_read_and_parse_ext_csd(struct mmc *mmc)
// Read the single EXT CSD block.
rc = sdmmc_send_command(mmc, CMD_SEND_EXT_CSD, MMC_RESPONSE_LEN48,
MMC_CHECKS_ALL, 0, NULL, 1, false, true, ext_csd);
MMC_CHECKS_ALL, 0, NULL, 1, false, false, ext_csd);
if (rc) {
mmc_print(mmc, "ERROR: failed to read the extended CSD!");
return rc;
@ -1628,6 +1563,7 @@ static int sdmmc_set_up_block_transfer_size(struct mmc *mmc)
return 0;
}
/**
* Switches the SDMMC card and controller to the fullest bus width possible.
*
@ -1636,7 +1572,7 @@ static int sdmmc_set_up_block_transfer_size(struct mmc *mmc)
static int sdmmc_switch_bus_width(struct mmc *mmc, enum sdmmc_bus_width width)
{
// Ask the card to adjust to the wider bus width.
int rc = sdmmc_switch_mode(mmc, MMC_SWITCH_EXTCSD_NORMAL,
int rc = mmc->switch_mode(mmc, MMC_SWITCH_EXTCSD_NORMAL,
MMC_BUS_WIDTH, width, mmc->timeout);
if (rc) {
mmc_print(mmc, "could not switch mode on the card side!");
@ -1700,7 +1636,7 @@ static int sdmmc_set_up_partitions(struct mmc *mmc)
mmc_print(mmc, "detected a card with hardware partitions.");
// Use partitioning.
return sdmmc_switch_mode(mmc, MMC_SWITCH_EXTCSD_NORMAL,
return mmc->switch_mode(mmc, MMC_SWITCH_EXTCSD_NORMAL,
MMC_GROUP_ERASE_DEF, MMC_EXT_CSD_ERASE_GROUP_DEF_BIT, mmc->timeout);
}
@ -1754,30 +1690,6 @@ static int sdmmc_get_relative_address(struct mmc *mmc)
}
/**
* Establishes a relative address that can be used to communicate with a
* given card-- either by using or replacing mmc->relative_address.
*
* @param mmc The MMC controller to work with.
* @return 0 on success, or an error code on failure.
*/
static int sdmmc_get_or_set_relative_address(struct mmc *mmc)
{
// The SD and MMC specifications handle relative address assignemnt
// differently-- delegate accordingly.
switch (mmc->card_type) {
case MMC_CARD_EMMC:
case MMC_CARD_MMC:
return sdmmc_set_relative_address(mmc);
case MMC_CARD_SD:
return sdmmc_get_relative_address(mmc);
default:
mmc_print(mmc, "cannot figure out how to set up an relative address for TYPE%d devices", mmc->card_type);
return ENODEV;
}
}
/**
* Retrieves information about the card, and populates the MMC structure accordingly.
* Used as part of the SDMMC initialization process.
@ -1798,7 +1710,7 @@ static int sdmmc_card_init(struct mmc *mmc)
memcpy(mmc->cid, response, sizeof(mmc->cid));
// Establish a relative address to communicate with
rc = sdmmc_get_or_set_relative_address(mmc);
rc = mmc->establish_relative_address(mmc);
if (rc) {
mmc_print(mmc, "could not establish a relative address! (%d)", rc);
return rc;
@ -1904,7 +1816,6 @@ static int sdmmc_sd_wait_for_card_readiness(struct mmc *mmc, uint32_t *response)
}
/**
* Handles MMC-specific card initialization.
*/
@ -2036,44 +1947,6 @@ static int sdmmc_sd_card_init(struct mmc *mmc)
}
/**
* Handle any speciailized initialization required by the given device type.
*
* @param mmc The device to initialize.
*/
static int sdmmc_handle_card_type_init(struct mmc *mmc)
{
int rc;
switch (mmc->card_type) {
// Handle initialization of eMMC cards.
case MMC_CARD_EMMC:
// FIXME: also handle MMC and SD cards that aren't eMMC
rc = sdmmc_mmc_card_init(mmc);
break;
// Handle initialization of SD.
case MMC_CARD_SD:
rc = sdmmc_sd_card_init(mmc);
break;
default:
mmc_print(mmc,"initialization of this device not yet supported!");
rc = ENOTTY;
break;
}
return rc;
}
/**
* @returns true iff the given READ_STATUS response indicates readiness
*/
@ -2136,7 +2009,7 @@ static int sdmmc_wait_for_card_ready(struct mmc *mmc, uint32_t 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)
static int sdmmc_mmc_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 =
@ -2164,6 +2037,25 @@ static int sdmmc_switch_mode(struct mmc *mmc, enum sdmmc_switch_access_mode mode
}
/**
* Issues a SWITCH_MODE command, which can be used to write registers on the SD 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_sd_switch_mode(struct mmc *mmc, enum sdmmc_switch_access_mode mode, enum sdmmc_switch_field field, uint16_t value, uint32_t timeout)
{
mmc_print(mmc, "ERROR: SD card mode switching not yet implemented");
return ENOSYS;
}
/**
* @return True iff the given MMC card supports hardare partitions.
*/
@ -2173,22 +2065,79 @@ static bool sdmmc_supports_hardware_partitions(struct mmc *mmc)
}
/**
* card detect method for built-in cards.
*/
bool sdmmc_builtin_card_present(struct mmc *mmc)
{
return true;
}
/**
* card detect method for GPIO-based card detects
*/
bool sdmmc_external_card_present(struct mmc *mmc)
{
return !gpio_read(mmc->card_detect_gpio);
}
/**
* Switches a given SDMMC Controller where
*/
static void sdmmc_apply_card_type(struct mmc *mmc, enum sdmmc_card_type type)
{
// Store the card type for our own reference...
mmc->card_type = type;
// Set up our per-protocol function pointers.
switch (type) {
// MMC-protoco cards
case MMC_CARD_EMMC:
case MMC_CARD_MMC:
mmc->card_init = sdmmc_mmc_card_init;
mmc->establish_relative_address = sdmmc_set_relative_address;
mmc->switch_mode = sdmmc_mmc_switch_mode;
break;
// SD-protocol cards
case MMC_CARD_SD:
mmc->card_init = sdmmc_sd_card_init;
mmc->establish_relative_address = sdmmc_get_relative_address;
mmc->switch_mode = sdmmc_sd_switch_mode;
break;
// Switch-cart protocol cards
case MMC_CARD_CART:
printk("BUG: trying to use an impossible code path!\n");
panic(0);
}
}
/**
* Populates the given MMC object with defaults for its controller.
*
* @param mmc The mmc object to populate.
*/
static void sdmmc_initialize_defaults(struct mmc *mmc)
static int sdmmc_initialize_defaults(struct mmc *mmc)
{
// Set up based on the controller
switch (mmc->controller) {
case SWITCH_EMMC:
mmc->name = "eMMC";
mmc->card_type = MMC_CARD_EMMC;
mmc->max_bus_width = MMC_BUS_WIDTH_8BIT;
mmc->operating_voltage = MMC_VOLTAGE_1V8;
// The Switch's eMMC always uses block addressin.g
// Set up function pointers for each of our per-instance functions.
mmc->set_up_clock_and_io = sdmmc4_set_up_clock_and_io;
mmc->enable_supplies = sdmmc4_enable_supplies;
mmc->card_present = sdmmc_builtin_card_present;
// The EMMC controller always uses an EMMC card.
sdmmc_apply_card_type(mmc, MMC_CARD_EMMC);
// The Switch's eMMC always uses block addressing.
mmc->uses_block_addressing = true;
break;
@ -2197,6 +2146,14 @@ static void sdmmc_initialize_defaults(struct mmc *mmc)
mmc->card_type = MMC_CARD_SD;
mmc->max_bus_width = MMC_BUS_WIDTH_4BIT;
mmc->operating_voltage = MMC_VOLTAGE_3V3;
mmc->card_detect_gpio = GPIO_MICROSD_CARD_DETECT;
// For the microSD card slot, assume we have an SD-type card.
// Negotiation has a chance to change this, later.
mmc->set_up_clock_and_io = sdmmc1_set_up_clock_and_io;
mmc->enable_supplies = sdmmc1_enable_supplies;
mmc->card_present = sdmmc_external_card_present;
sdmmc_apply_card_type(mmc, MMC_CARD_SD);
// Start off assuming byte addressing; we'll detect and correct this
// later, if necessary.
@ -2204,9 +2161,11 @@ static void sdmmc_initialize_defaults(struct mmc *mmc)
break;
default:
printk("ERROR: initialization not yet writen for SDMMC%d", mmc->controller);
break;
printk("ERROR: initialization not yet writen for SDMMC%d", mmc->controller + 1);
return ENOSYS;
}
return 0;
}
@ -2225,7 +2184,14 @@ int sdmmc_init(struct mmc *mmc, enum sdmmc_controller controller)
// Get a reference to the registers for the relevant SDMMC controller.
mmc->controller = controller;
mmc->regs = sdmmc_get_regs(controller);
sdmmc_initialize_defaults(mmc);
// Set the defaults for the card, including the default function pointers
// for the assumed card type, and the per-controller options.
rc = sdmmc_initialize_defaults(mmc);
if (rc) {
printk("ERROR: controller SDMMC%d not currently supported!\n", controller + 1);
return rc;
}
// Default to a timeout of 1S.
mmc->timeout = 1000000;
@ -2234,6 +2200,9 @@ int sdmmc_init(struct mmc *mmc, enum sdmmc_controller controller)
// Use DMA, by default.
mmc->use_dma = true;
// Don't allow writing unless the caller explicitly enables it.
mmc->write_enable = SDMMC_WRITE_DISABLED;
// Default to relative address of zero.
mmc->relative_address = 0;
@ -2244,8 +2213,14 @@ int sdmmc_init(struct mmc *mmc, enum sdmmc_controller controller)
return rc;
}
// ... and verify that the card is there.
if (!mmc->card_present(mmc)) {
mmc_print(mmc, "ERROR: no card detected!");
return ENODEV;
}
// Handle the initialization that's specific to the card type.
rc = sdmmc_handle_card_type_init(mmc);
rc = mmc->card_init(mmc);
if (rc) {
mmc_print(mmc, "failed to set run card-specific initialization (%d)!", rc);
return rc;
@ -2276,7 +2251,7 @@ int sdmmc_select_partition(struct mmc *mmc, enum sdmmc_partition partition)
// 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, 0);
rc = mmc->switch_mode(mmc, MMC_SWITCH_MODE_WRITE_BYTE, MMC_PARTITION_CONFIG, argument, 0);
if (rc) {
mmc_print(mmc, "failed to select partition %d (%02x, rc=%d)", partition, argument, rc);
}
@ -2289,7 +2264,7 @@ int sdmmc_select_partition(struct mmc *mmc, enum sdmmc_partition partition)
/**
* Reads a sector or sectors from a given SD card.
* Reads a sector or sectors from a given SD/MMC card.
*
* @param mmc The MMC device to work with.
* @param buffer The output buffer to target.
@ -2300,7 +2275,6 @@ int sdmmc_select_partition(struct mmc *mmc, enum sdmmc_partition partition)
*/
int sdmmc_read(struct mmc *mmc, void *buffer, uint32_t block, unsigned int count)
{
// Determine if we need to perform a single-block or multi-block read.
uint32_t command = (count == 1) ? CMD_READ_SINGLE_BLOCK : CMD_READ_MULTIPLE_BLOCK;
// Determine the argument, which indicates which address we're reading/writing.
@ -2313,9 +2287,64 @@ 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, true, buffer);
return sdmmc_send_command(mmc, command, MMC_RESPONSE_LEN48, MMC_CHECKS_ALL, extent, NULL, count, false, count > 1, buffer);
}
/**
* Releases the SDMMC write lockout, enabling access to the card.
* Note that by default, setting this to WRITE_ENABLED will not allow access to eMMC.
* Check the source for a third constant that can be used to enable eMMC writes.
*
* @param perms The permissions to apply-- typically WRITE_DISABLED or WRITE_ENABLED.
*/
void sdmmc_set_write_enable(struct mmc *mmc, enum sdmmc_write_permission perms)
{
mmc->write_enable = perms;
}
/**
* Writes a sector or sectors to a given SD/MMC card.
*
* @param mmc The MMC device to work with.
* @param buffer The input buffer to write.
* @param block The sector number to write from.
* @param count The number of sectors to write.
*
* @return 0 on success, or an error code on failure.
*/
int sdmmc_write(struct mmc *mmc, void *buffer, uint32_t block, unsigned int count)
{
// Sanity check variables: we're especially careful about allowing writes to the switch eMMC.
bool is_emmc = (mmc->controller == SWITCH_EMMC);
bool allow_mmc_write = (mmc->write_enable == SDMMC_WRITE_ENABLED_INCLUDING_EMMC);
uint32_t command = (count == 1) ? CMD_WRITE_SINGLE_BLOCK : CMD_WRITE_MULTIPLE_BLOCK;
// Determine the argument, which indicates which address we're reading/writing.
uint32_t extent = block;
// If we don't have an explict write enable, don't allow writes.
if (mmc->write_enable == SDMMC_WRITE_DISABLED) {
mmc_print(mmc, "tried to write to an external card, but write was not enabled!");
return EACCES;
}
// Explicitly protect the switch's eMMC to prevent bricks.
if (is_emmc && !allow_mmc_write) {
mmc_print(mmc, "cowardly refusing to write to the switch's eMMMC");
return EACCES;
}
// If this card uses byte addressing rather than sector addressing,
// multiply by the block size.
if (!mmc->uses_block_addressing) {
extent *= sdmmc_get_block_size(mmc, false);
}
// Execute the relevant read.
return sdmmc_send_command(mmc, command, MMC_RESPONSE_LEN48, MMC_CHECKS_ALL, extent, NULL, count, true, count > 1, buffer);
}
/**
* Checks to see whether an SD card is present.
@ -2325,18 +2354,5 @@ int sdmmc_read(struct mmc *mmc, void *buffer, uint32_t block, unsigned int count
*/
bool sdmmc_card_present(struct mmc *mmc)
{
switch (mmc->controller) {
// The eMMC is always present.
case SWITCH_EMMC:
return true;
// The Switch's microSD card has a GPIO card detect pin.
case SWITCH_MICROSD:
return !gpio_read(GPIO_MICROSD_CARD_DETECT);
default:
mmc_print(mmc, "cannot figure out how to determine card presence!");
return false;
}
return mmc->card_present(mmc);
}

105
fusee/fusee-secondary/src/sdmmc.h
View file

@ -9,6 +9,7 @@
#include <stdbool.h>
#include <stdint.h>
#include "utils.h"
#include "gpio.h"
/* Opaque pointer to the Tegra SDMMC registers */
struct tegra_sdmmc;
@ -71,6 +72,56 @@ enum sdmmc_controller {
SWITCH_EMMC = 3
};
/**
* Write permission modes for SD cards.
*/
enum sdmmc_write_permission {
SDMMC_WRITE_DISABLED,
SDMMC_WRITE_ENABLED,
/* use this with the utmost caution so you don't wind up with a brick */
SDMMC_WRITE_ENABLED_INCLUDING_EMMC,
};
/**
* 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 = 8,
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,
MMC_BUS_WIDTH = 183,
};
/**
* Primary data structure describing a Fusée MMC driver.
@ -80,9 +131,22 @@ struct mmc {
/* Controller properties */
const char *name;
unsigned int timeout;
enum sdmmc_card_type card_type;
bool use_dma;
unsigned int timeout;
enum tegra_named_gpio card_detect_gpio;
enum sdmmc_card_type card_type;
enum sdmmc_write_permission write_enable;
/* Per-controller operations. */
int (*set_up_clock_and_io)(struct mmc *mmc);
int (*enable_supplies)(struct mmc *mmc);
bool (*card_present)(struct mmc *mmc);
/* Per-card-type operations */
int (*card_init)(struct mmc *mmc);
int (*establish_relative_address)(struct mmc *mmc);
int (*switch_mode)(struct mmc *mmc, enum sdmmc_switch_access_mode mode,
enum sdmmc_switch_field field, uint16_t value, uint32_t timeout);
/* Card properties */
uint8_t cid[15];
@ -117,12 +181,20 @@ struct mmc;
* Parititions supported by the Switch eMMC.
*/
enum sdmmc_partition {
MMC_PARTITION_USER = 0,
MMC_PARTITION_BOOT1 = 1,
MMC_PARITTION_BOOT2 = 2,
SDMMC_PARTITION_USER = 0,
SDMMC_PARTITION_BOOT0 = 1,
SDMMC_PARTITION_BOOT1 = 2,
};
/**
* Sets the current SDMMC debugging loglevel.
*
* @param loglevel Current log level. A higher value prints more logs.
*/
void sdmmc_set_loglevel(int loglevel);
/**
* Initiailzes an SDMMC controller for use with an eMMC or SD card device.
*
@ -155,6 +227,29 @@ int sdmmc_select_partition(struct mmc *mmc, enum sdmmc_partition partition);
int sdmmc_read(struct mmc *mmc, void *buffer, uint32_t sector, unsigned int count);
/**
* Releases the SDMMC write lockout, enabling access to the card.
* Note that by default, setting this to WRITE_ENABLED will not allow access to eMMC.
* Check the source for a third constant that can be used to enable eMMC writes.
*
* @param perms The permissions to apply-- typically WRITE_DISABLED or WRITE_ENABLED.
*/
void sdmmc_set_write_enable(struct mmc *mmc, enum sdmmc_write_permission perms);
/**
* Writes a sector or sectors to a given SD/MMC card.
*
* @param mmc The MMC device to work with.
* @param buffer The input buffer to write.
* @param block The sector number to write from.
* @param count The number of sectors to write.
*
* @return 0 on success, or an error code on failure.
*/
int sdmmc_write(struct mmc *mmc, void *buffer, uint32_t block, unsigned int count);
/**
* Checks to see whether an SD card is present.
*