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Code Issues Releases Activity

fusee: get non-data SDMMC commands fully working on eMMC

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This commit is contained in:
Kate J. Temkin 2018-04-28 04:42:59 -06:00
parent dbb65428e8
commit eb48e06331
3 changed files with 207 additions and 39 deletions
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4
fusee/fusee-primary/src/car.h
View file

@ -50,7 +50,9 @@ enum {
enum {
CLK_SOURCE_MASK = (0b111 << 29),
CLK_SOURCE_FIRST = 0,
CLK_DIVIDER_UNITY = 0
CLK_DIVIDER_UNITY = 0,
CLK_DIVIDER_32 = 32,
};
enum {

212
fusee/fusee-primary/src/sdmmc.c
View file

@ -162,7 +162,6 @@ enum sdmmc_register_bits {
MMC_STATUS_COMMAND_INDEX_ERROR = (1 << 19),
MMC_STATUS_ERROR_MASK = (0xF << 16),
//MMC_STATUS_ERROR_MASK = (0xE << 16),
/* Host control */
MMC_DMA_SELECT_MASK = (0x3 << 3),
@ -195,13 +194,19 @@ enum sdmmc_command {
CMD_SET_BLKLEN = 16,
CMD_READ_SINGLE_BLOCK = 17,
CMD_READ_MULTIPLE_BLOCK = 18,
CMD_APP_CMD = 55,
};
/**
* SDMMC command argument numbers
*/
enum sdmmc_command_magic {
MMC_SEND_IF_COND_MAGIC = 0xaa,
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),
};
@ -307,11 +312,12 @@ static int sdmmc_hardware_init(struct mmc *mmc)
// Put SDMMC4 in reset
car->rst_dev_l_set |= 0x8000;
// Set SDMMC4 clock source (PLLP_OUT0) and divisor (1)
car->clk_src[CLK_SOURCE_SDMMC4] = CLK_SOURCE_FIRST | CLK_DIVIDER_UNITY;
// Set SDMMC4 clock source (PLLP_OUT0) and divisor (32).
// We use 32 beacuse Nintendo does, and they probably know what they're doing?
car->clk_src[CLK_SOURCE_SDMMC4] = CLK_SOURCE_FIRST | CLK_DIVIDER_32;
// Set the legacy divier used for
car->clk_src_y[CLK_SOURCE_SDMMC_LEGACY] = CLK_SOURCE_FIRST | CLK_DIVIDER_UNITY;
car->clk_src_y[CLK_SOURCE_SDMMC_LEGACY] = CLK_SOURCE_FIRST | CLK_DIVIDER_32;
// Set SDMMC4 clock enable
car->clk_dev_l_set |= 0x8000;
@ -340,6 +346,10 @@ static int sdmmc_hardware_init(struct mmc *mmc)
regs->vendor_clock_cntrl &= ~(0x1F000000);
regs->vendor_clock_cntrl |= 0x08000000;
// The boootrom sets TAP_VAL to be 4.
// We'll do that too. FIXME: should we?
regs->vendor_clock_cntrl |= 0x40000;
// Set SDMMC2TMC_CFG_SDMEMCOMP_VREF_SEL to 0x07
regs->sdmemcomppadctrl &= ~(0x0F);
regs->sdmemcomppadctrl |= 0x07;
@ -473,7 +483,7 @@ static int sdmmc_hardware_init(struct mmc *mmc)
// Set SDHCI_DIVIDER and SDHCI_DIVIDER_HI
// FIXME: divider SD if necessary
regs->clock_control &= ~(0xFFC0);
regs->clock_control |= (0x80 << 8); // XXX wtf is this
regs->clock_control |= (0x80 << 8); // use the slowest setting, for now
//regs->clock_control |= ((sd_divider_lo << 0x08) | (sd_divider_hi << 0x06));
// HS400/HS667 modes require additional DLL calibration
@ -838,11 +848,22 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
sdmmc_handle_command_data(mmc, blocks_to_transfer, is_write, data_buffer);
}
mmc_print(mmc, "command success!");
mmc_print(mmc, "CMD%d success!", command);
return 0;
}
/**
* Convenience function that sends a simple SDMMC command
* and awaits response. Wrapper around sdmmc_send_command.
*
* @param mmc The SDMMC device to be used to transmit the command.
* @param response_type The type of response to expect-- mostly specifies the length.
* @param argument The argument to the SDMMC command.
* @param response_buffer A buffer to store the response. Should be at uint32_t for a LEN48 command,
* or 16 bytes for a LEN136 command.
*
* @returns 0 on success, an error number on failure
*/
static int sdmmc_send_simple_command(struct mmc *mmc, enum sdmmc_command command,
enum sdmmc_response_type response_type, uint32_t argument, void *response_buffer)
{
@ -854,15 +875,15 @@ static int sdmmc_send_simple_command(struct mmc *mmc, enum sdmmc_command command
}
/**
* Retrieves information about the card, and populates the MMC structure accordingly.
* Used as part of the SDMMC initialization process.
* Handles eMMC-specific card initialization.
*/
static int sdmmc_card_init(struct mmc *mmc)
static int emmc_card_init(struct mmc *mmc)
{
int rc;
uint8_t response[17];
uint32_t response[4];
mmc_print(mmc, "setting up card as eMMC");
// Bring the bus out of its idle state.
rc = sdmmc_send_simple_command(mmc, CMD_GO_IDLE_OR_INIT, MMC_RESPONSE_NONE, 0, NULL);
@ -871,17 +892,90 @@ static int sdmmc_card_init(struct mmc *mmc)
return rc;
}
// Check to see if this is a Version 2.0 card.
rc = sdmmc_send_simple_command(mmc, CMD_SEND_IF_COND, MMC_RESPONSE_LEN48, MMC_SEND_IF_COND_MAGIC, response);
// Wait for the card to finish being busy.
while (true) {
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);
if (rc) {
// If we had an error, this was a v1 card.
mmc_print(mmc, "handling as a v1.0 card.");
} else {
// If this responded with the appropriate magic, it's a v2 card.
if (response[0] == MMC_SEND_IF_COND_MAGIC)
mmc_print(mmc, "handling as a v2.0 card.");
mmc_print(mmc, "ERROR: could not read the card's operating conditions!");
return rc;
}
// Validate that this is a valid Switch eMMC.
// Per the spec, any card greater than 2GiB should respond with this magic number.
response_masked = response[0] & MMC_EMMC_OPERATING_COND_CAPACITY_MASK;
if (response_masked != MMC_EMMC_OPERATING_COND_CAPACITY_MAGIC) {
mmc_print(mmc, "ERROR: this doesn't appear to be a valid Switch eMMC!");
return ENOTTY;
}
// If the device has just become ready, we're done!
response_masked = response[0] & MMC_EMMC_OPERATING_READINESS_MASK;
if (response_masked == MMC_EMMC_OPERATING_COND_READY) {
return 0;
}
}
}
/**
* Reads the active MMC card's Card Specific Data, and updates the MMC object's properties.
*
* @param mmc The MMC to be queired and updated.
* @returns 0 on success, or an errno on failure
*/
static int sdmmc_read_and_parse_csd(struct mmc *mmc)
{
int rc;
uint32_t csd[4];
rc = sdmmc_send_simple_command(mmc, CMD_SEND_CSD, MMC_RESPONSE_LEN136, mmc->relative_address << 16, csd);
if (rc) {
mmc_print(mmc, "could not get the card's CSD!");
return ENODEV;
}
// FIXME: parse CSD
return 0;
}
/**
* Reads the active MMC card's Card Specific Data, and updates the MMC object's properties.
*
* @param mmc The MMC to be queired and updated.
* @returns 0 on success, or an errno on failure
*/
static int sdmmc_read_and_parse_ext_csd(struct mmc *mmc)
{
int rc;
uint32_t csd[4];
// FIXME: reading the extended CSD requires us to read data; so we're not ready to do it yet
// FIXME: parse CSD
(void)csd;
(void)rc;
mmc_print(mmc, "ERROR: ext-CSD reading not yet implemented");
return ENOSYS;
}
/**
* Retrieves information about the card, and populates the MMC structure accordingly.
* Used as part of the SDMMC initialization process.
*/
static int sdmmc_card_init(struct mmc *mmc)
{
int rc;
uint32_t response[4];
// Retreive the card ID.
rc = sdmmc_send_simple_command(mmc, CMD_ALL_SEND_CID, MMC_RESPONSE_LEN136, 0, response);
if (rc) {
@ -892,14 +986,64 @@ static int sdmmc_card_init(struct mmc *mmc)
// Store the card ID for later.
memcpy(mmc->cid, response, sizeof(mmc->cid));
// TODO: Read and handle the CSD.
// TODO: Toggle the card select, so we it knows we're talking to it.
// TODO: Read and handle the extended CSD.
// Set up the card's relative address.
rc = sdmmc_send_simple_command(mmc, CMD_SET_RELATIVE_ADDR, MMC_RESPONSE_LEN48, mmc->relative_address << 16, response);
if (rc) {
mmc_print(mmc, "could not set the card's relative address! (%d)", rc);
return EPIPE;
}
// Read and handle card's Card Specific Data (CSD).
rc = sdmmc_read_and_parse_csd(mmc);
if (rc) {
mmc_print(mmc, "could not populate CSD attributes! (%d)", rc);
return EPIPE;
}
// Select our eMMC card, so it knows we're talking to it.
rc = sdmmc_send_simple_command(mmc, CMD_TOGGLE_CARD_SELECT, MMC_RESPONSE_LEN48, mmc->relative_address << 16, response);
if (rc) {
mmc_print(mmc, "could not select the active card for use! (%d)", rc);
return EPIPE;
}
// Read and handle card's Extended Card Specific Data (ext-CSD).
rc = sdmmc_read_and_parse_ext_csd(mmc);
if (rc) {
mmc_print(mmc, "could not populate extended-CSD attributes! (%d)", rc);
return EPIPE;
}
return rc;
}
/**
* 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 = emmc_card_init(mmc);
break;
default:
mmc_print(mmc,"initialization of this device not yet supported!");
rc = ENOTTY;
break;
}
return rc;
}
/**
@ -917,32 +1061,42 @@ int sdmmc_init(struct mmc *mmc, enum sdmmc_controller controller)
// Get a reference to the registers for the relevant SDMMC controller.
mmc->regs = sdmmc_get_regs(controller);
mmc->name = "eMMC";
mmc->card_type = MMC_CARD_EMMC;
// Default to a timeout of 1S.
// FIXME: lower
// FIXME: abstract
mmc->timeout = 1000000;
// Default to relative address of zero.
mmc->relative_address = 0;
// Initialize the raw SDMMC controller.
mmc_print(mmc, "setting up hardware");
rc = sdmmc_hardware_init(mmc);
if (rc) {
mmc_print(mmc, "failed to set up controller! (%d)", rc);
return rc;
}
// Initialize the SDMMC card.
mmc_print(mmc, "setting up card");
rc = sdmmc_card_init(mmc);
// Handle the initialization that's specific to the card type.
rc = sdmmc_handle_card_type_init(mmc);
if (rc) {
mmc_print(mmc, "failed to set up card! (%d)", rc);
mmc_print(mmc, "failed to set run card-specific initialization (%d)!", rc);
return rc;
}
// Handle the initialization that's common to all card types.
rc = sdmmc_card_init(mmc);
if (rc) {
mmc_print(mmc, "failed to set up card (%d)!", rc);
return rc;
}
return 0;
}
/**
* Reads a sector or sectors from a given SD card.
*

14
fusee/fusee-primary/src/sdmmc.h
View file

@ -9,6 +9,17 @@
/* Opaque pointer to the Tegra SDMMC registers */
struct tegra_sdmmc;
/**
* Represents the different types of devices an MMC object
* can represent.
*/
enum mmc_card_type {
MMC_CARD_EMMC,
MMC_CARD_MMC,
MMC_CARD_SD,
MMC_CARD_CART,
};
/**
* Primary data structure describing a Fusée MMC driver.
*/
@ -16,10 +27,11 @@ struct mmc {
/* Controller properties */
char *name;
unsigned int timeout;
enum mmc_card_type card_type;
/* Card properties */
uint8_t cid[15];
uint32_t relative_address;
/* Pointers to hardware structures */
volatile struct tegra_sdmmc *regs;