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fusee: use full bus width and faster initial clock speed

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This commit is contained in:
Kate J. Temkin 2018-05-10 03:21:43 -07:00
parent 20c225c829
commit b20a04ede5
2 changed files with 66 additions and 52 deletions
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114
fusee/fusee-primary/src/sdmmc.c
View File

@ -228,6 +228,7 @@ enum sdmmc_command {
CMD_SET_DSR = 4,
CMD_TOGGLE_SLEEP_AWAKE = 5,
CMD_SWITCH_MODE = 6,
CMD_APP_SWITCH_WIDTH = 6,
CMD_TOGGLE_CARD_SELECT = 7,
CMD_SEND_EXT_CSD = 8,
CMD_SEND_IF_COND = 8,
@ -244,6 +245,7 @@ enum sdmmc_command {
CMD_WRITE_MULTIPLE_BLOCK = 25,
CMD_APP_SEND_OP_COND = 41,
CMD_APP_SET_CARD_DETECT = 42,
CMD_APP_COMMAND = 55,
};
@ -434,6 +436,8 @@ 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_APP_SET_CARD_DETECT:
return "CMD_APP_SET_CARD_DETECT";
case CMD_WRITE_SINGLE_BLOCK:
return "CMD_WRITE_SINGLE_BLOCK";
case CMD_WRITE_MULTIPLE_BLOCK:
@ -819,7 +823,7 @@ 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 |= (0x30 << 8); // 200kHz, initially
regs->clock_control |= (0x18 << 8); // 400kHz, initially
// Set SDHCI_CLOCK_CARD_EN
regs->clock_control |= 0x04;
@ -1402,9 +1406,9 @@ static int sdmmc_send_simple_app_command(struct mmc *mmc, enum sdmmc_command com
int rc;
// First, send the application command.
rc = sdmmc_send_simple_command(mmc, CMD_APP_COMMAND, MMC_RESPONSE_LEN48, 0, NULL);
rc = sdmmc_send_simple_command(mmc, CMD_APP_COMMAND, MMC_RESPONSE_LEN48, mmc->relative_address << 16, NULL);
if (rc) {
mmc_print(mmc, "failed to prepare application command! (%d)", rc);
mmc_print(mmc, "failed to prepare application command %s! (%d)", sdmmc_get_command_string(command), rc);
return rc;
}
@ -1581,12 +1585,13 @@ static int sdmmc_set_up_block_transfer_size(struct mmc *mmc)
}
/**
* Switches the SDMMC card and controller to the fullest bus width possible.
*
* @param mmc The MMC controller to switch up to a full bus width.
*/
static int sdmmc_switch_bus_width(struct mmc *mmc, enum sdmmc_bus_width width)
static int sdmmc_mmc_switch_bus_width(struct mmc *mmc, enum sdmmc_bus_width width)
{
// Ask the card to adjust to the wider bus width.
int rc = mmc->switch_mode(mmc, MMC_SWITCH_EXTCSD_NORMAL,
@ -1596,7 +1601,7 @@ static int sdmmc_switch_bus_width(struct mmc *mmc, enum sdmmc_bus_width width)
return rc;
}
// And switch the bus width on our side.
// Apply the same changes on the host side.
mmc->regs->host_control &= ~MMC_HOST_BUS_WIDTH_MASK;
switch (width) {
case MMC_BUS_WIDTH_4BIT:
@ -1608,6 +1613,40 @@ static int sdmmc_switch_bus_width(struct mmc *mmc, enum sdmmc_bus_width width)
default:
break;
}
return 0;
}
/**
* Switches the SDMMC card and controller to the fullest bus width possible.
*
* @param mmc The MMC controller to switch up to a full bus width.
*/
static int sdmmc_sd_switch_bus_width(struct mmc *mmc, enum sdmmc_bus_width width)
{
// By default, SD DAT3 is used for card detect. We'll need to
// release it from this function by dropping its pull-up resistor
// before we can use the line for data. Do so.
int rc = sdmmc_send_simple_app_command(mmc, CMD_APP_SET_CARD_DETECT,
MMC_RESPONSE_LEN48, MMC_CHECKS_ALL, 0, NULL);
if (rc) {
mmc_print(mmc, "could not stop using DAT3 as a card detect!");
return rc;
}
// Ask the card to adjust to the wider bus width.
rc = sdmmc_send_simple_app_command(mmc, CMD_APP_SWITCH_WIDTH,
MMC_RESPONSE_LEN48, MMC_CHECKS_ALL, width, NULL);
if (rc) {
mmc_print(mmc, "could not switch mode on the card side!");
return rc;
}
// Apply the same changes on the host side.
mmc->regs->host_control &= ~MMC_HOST_BUS_WIDTH_MASK;
if (mmc->max_bus_width == SD_BUS_WIDTH_4BIT) {
mmc->regs->host_control |= MMC_HOST_BUS_WIDTH_4BIT;
}
return 0;
}
@ -1616,12 +1655,12 @@ static int sdmmc_switch_bus_width(struct mmc *mmc, enum sdmmc_bus_width width)
/**
* Optimize our SDMMC transfer mode to fully utilize the bus.
*/
static int mmc_optimize_transfer_mode(struct mmc *mmc)
static int sdmmc_optimize_transfer_mode(struct mmc *mmc)
{
int rc;
// Switch the device to its maximum bus width.
rc = sdmmc_switch_bus_width(mmc, mmc->max_bus_width);
rc = mmc->switch_bus_width(mmc, mmc->max_bus_width);
if (rc) {
mmc_print(mmc, "could not switch the controller's bus width!");
return rc;
@ -1633,31 +1672,6 @@ static int mmc_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)
{
// 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 (!mmc->partitioned) {
mmc_print(mmc, "NOTE: card supports partitions but is not partitioned");
return ENOTDIR;
}
mmc_print(mmc, "detected a card with hardware partitions.");
// Use partitioning.
return mmc->switch_mode(mmc, MMC_SWITCH_EXTCSD_NORMAL,
MMC_GROUP_ERASE_DEF, MMC_EXT_CSD_ERASE_GROUP_DEF_BIT, mmc->timeout);
}
/**
* Requests that an MMC target use the card's current relative address.
*
@ -1708,8 +1722,10 @@ static int sdmmc_get_relative_address(struct mmc *mmc)
/**
* Retrieves information about the card, and populates the MMC structure accordingly.
* Used as part of the SDMMC initialization process.
* Shared card initialization for SD and MMC cards.
* Used to bring the card fully online and gather information about the card.
*
* @param mmc The MMC controller that will perform the initilaization.
*/
static int sdmmc_card_init(struct mmc *mmc)
{
@ -1754,6 +1770,15 @@ static int sdmmc_card_init(struct mmc *mmc)
return rc;
}
// Switch to a transfer mode that can more efficiently utilize the bus.
rc = sdmmc_optimize_transfer_mode(mmc);
if (rc) {
mmc_print(mmc, "could not optimize bus utlization! (%d)", rc);
// TODO: possibly skip this?
return rc;
}
return 0;
}
@ -1863,15 +1888,6 @@ static int sdmmc_mmc_card_init(struct mmc *mmc)
return rc;
}
// Switch to a transfer mode that can more efficiently utilize the bus.
/*
rc = mmc_optimize_transfer_mode(mmc);
if (rc) {
mmc_print(mmc, "could not optimize bus utlization! (%d)", rc);
}
*/
(void)mmc_optimize_transfer_mode;
// Read and handle card's Extended Card Specific Data (ext-CSD).
rc = sdmmc_read_and_parse_ext_csd(mmc);
if (rc) {
@ -1879,12 +1895,6 @@ static int sdmmc_mmc_card_init(struct mmc *mmc)
return EPIPE;
}
// 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", rc);
}
return 0;
}
@ -1958,8 +1968,6 @@ static int sdmmc_sd_card_init(struct mmc *mmc)
return rc;
}
// FIXME: optimize bus utilization here?
// is this just a call to the same routine as for eMMC?
return 0;
}
@ -2115,6 +2123,7 @@ static void sdmmc_apply_card_type(struct mmc *mmc, enum sdmmc_card_type type)
mmc->card_init = sdmmc_mmc_card_init;
mmc->establish_relative_address = sdmmc_set_relative_address;
mmc->switch_mode = sdmmc_mmc_switch_mode;
mmc->switch_bus_width = sdmmc_mmc_switch_bus_width;
break;
// SD-protocol cards
@ -2122,6 +2131,7 @@ static void sdmmc_apply_card_type(struct mmc *mmc, enum sdmmc_card_type type)
mmc->card_init = sdmmc_sd_card_init;
mmc->establish_relative_address = sdmmc_get_relative_address;
mmc->switch_mode = sdmmc_sd_switch_mode;
mmc->switch_bus_width = sdmmc_sd_switch_bus_width;
break;
// Switch-cart protocol cards
@ -2161,7 +2171,7 @@ static int sdmmc_initialize_defaults(struct mmc *mmc)
case SWITCH_MICROSD:
mmc->name = "uSD";
mmc->card_type = MMC_CARD_SD;
mmc->max_bus_width = MMC_BUS_WIDTH_4BIT;
mmc->max_bus_width = SD_BUS_WIDTH_4BIT;
mmc->operating_voltage = MMC_VOLTAGE_3V3;
mmc->card_detect_gpio = GPIO_MICROSD_CARD_DETECT;

4
fusee/fusee-primary/src/sdmmc.h
View File

@ -22,6 +22,9 @@ enum sdmmc_bus_width {
MMC_BUS_WIDTH_1BIT = 0,
MMC_BUS_WIDTH_4BIT = 1,
MMC_BUS_WIDTH_8BIT = 2,
SD_BUS_WIDTH_1BIT = 0,
SD_BUS_WIDTH_4BIT = 2
};
@ -147,6 +150,7 @@ struct 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);
int (*switch_bus_width)(struct mmc *mmc, enum sdmmc_bus_width width);
/* Card properties */
uint8_t cid[15];