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Code Issues Releases Activity

fusee: fix drive strength and avoid a pad wear-condition

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This commit is contained in:
Kate J. Temkin 2018-05-02 06:34:53 -06:00
parent fc97c3f773
commit 5b3be77f0e
2 changed files with 80 additions and 34 deletions
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3
fusee/fusee-primary/src/pinmux.h
View file

@ -197,6 +197,9 @@ enum tegra_pinmux_constants {
PINMUX_SELECT_FUNCTION1 = 1,
PINMUX_SELECT_FUNCTION2 = 2,
PINMUX_SELECT_FUNCTION3 = 3,
/* Drive */
PINMUX_DRIVE_2X = (0x1 << 13),
};

111
fusee/fusee-primary/src/sdmmc.c
View file

@ -495,43 +495,17 @@ static int sdmmc4_hardware_init(struct mmc *mmc)
/**
* Performs low-level initialization for SDMMC1, used for the SD card slot.
* Enables power supplies for SDMMC1, used for the SD card slot.
*/
static int sdmmc1_hardware_init(struct mmc *mmc)
static int sdmmc1_enable_supplies(struct mmc *mmc)
{
volatile struct tegra_car *car = car_get_regs();
volatile struct tegra_pinmux *pinmux = pinmux_get_regs();
volatile struct tegra_pmc *pmc = pmc_get_regs();
volatile struct tegra_padctl *padctl = padctl_get_regs();
(void)mmc;
volatile struct tegra_pinmux *pinmux = pinmux_get_regs();
// Ensure the PMC is prepared for the SDMMC card to recieve power.
pmc->no_iopower |= PMC_CONTROL_SDMMC1;
pmc->pwr_det_val |= PMC_CONTROL_SDMMC1;
// Configure the enable line for the SD card power.
pinmux->dmic3_clk = PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0;
gpio_configure_mode(GPIO_MICROSD_SUPPLY_ENABLE, GPIO_MODE_GPIO);
gpio_configure_direction(GPIO_MICROSD_SUPPLY_ENABLE, GPIO_DIRECTION_OUTPUT);
gpio_write(GPIO_MICROSD_SUPPLY_ENABLE, GPIO_LEVEL_HIGH);
// Set up each of the relevant pins to be connected to output drivers,
// and selected for SDMMC use.
pinmux->sdmmc1_clk = PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_INPUT;
pinmux->sdmmc1_cmd = PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_INPUT;
pinmux->sdmmc1_dat3 = PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_INPUT;
pinmux->sdmmc1_dat2 = PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_INPUT;
pinmux->sdmmc1_dat1 = PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_INPUT;
pinmux->sdmmc1_dat0 = PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_INPUT;
// Set up the SDMMC write protect.
// TODO: should this be an output, that we control?
pinmux->pz4 = PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_PULL_UP;
// Ensure we're using GPIO and not GPIO for the SD card's card detect.
padctl->vgpio_gpio_mux_sel &= ~PADCTL_SDMMC1_CD_SOURCE;
mmc_print(mmc, "mux sel is at %p", &padctl->vgpio_gpio_mux_sel);
// Set up the card detect pin as a GPIO input.
pinmux->pz1= PINMUX_SELECT_FUNCTION1 | PINMUX_PULL_UP | PINMUX_INPUT;
gpio_configure_mode(GPIO_MICROSD_CARD_DETECT, GPIO_MODE_GPIO);
@ -543,6 +517,43 @@ static int sdmmc1_hardware_init(struct mmc *mmc)
supply_enable(SUPPLY_MICROSD);
udelay(1000);
return 0;
}
/**
* Performs low-level initialization for SDMMC1, used for the SD card slot.
*/
static int sdmmc1_hardware_init(struct mmc *mmc)
{
volatile struct tegra_car *car = car_get_regs();
volatile struct tegra_pinmux *pinmux = pinmux_get_regs();
volatile struct tegra_padctl *padctl = padctl_get_regs();
(void)mmc;
// Configure the enable line for the SD card power.
pinmux->dmic3_clk = PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0;
gpio_configure_mode(GPIO_MICROSD_SUPPLY_ENABLE, GPIO_MODE_GPIO);
gpio_configure_direction(GPIO_MICROSD_SUPPLY_ENABLE, GPIO_DIRECTION_OUTPUT);
gpio_write(GPIO_MICROSD_SUPPLY_ENABLE, GPIO_LEVEL_HIGH);
// Set up each of the relevant pins to be connected to output drivers,
// and selected for SDMMC use.
pinmux->sdmmc1_clk = PINMUX_DRIVE_2X | PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_INPUT;
pinmux->sdmmc1_cmd = PINMUX_DRIVE_2X | PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_INPUT;
pinmux->sdmmc1_dat3 = PINMUX_DRIVE_2X | PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_INPUT;
pinmux->sdmmc1_dat2 = PINMUX_DRIVE_2X | PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_INPUT;
pinmux->sdmmc1_dat1 = PINMUX_DRIVE_2X | PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_INPUT;
pinmux->sdmmc1_dat0 = PINMUX_DRIVE_2X | PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_INPUT;
// Set up the SDMMC write protect.
// TODO: should this be an output, that we control?
pinmux->pz4 = PINMUX_TRISTATE_PASSTHROUGH | PINMUX_SELECT_FUNCTION0 | PINMUX_PULL_UP;
// Ensure we're using GPIO and not GPIO for the SD card's card detect.
padctl->vgpio_gpio_mux_sel &= ~PADCTL_SDMMC1_CD_SOURCE;
mmc_print(mmc, "mux sel is at %p", &padctl->vgpio_gpio_mux_sel);
// Put SDMMC1 in reset
car->rst_dev_l_set |= CAR_CONTROL_SDMMC1;
@ -589,6 +600,29 @@ static int sdmmc_setup_controller_clock_and_io(struct mmc *mmc)
}
/**
* 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;
}
/**
* Initialize the low-level SDMMC hardware.
* Thanks to hexkyz for this init code.
@ -611,11 +645,6 @@ static int sdmmc_hardware_init(struct mmc *mmc)
return rc;
}
if (!sdmmc_card_present(mmc)) {
mmc_print(mmc, "ERROR: no card detected!");
return ENODEV;
}
// Software reset the SDMMC device
rc = sdmmc_hardware_reset(mmc);
if (rc) {
@ -760,6 +789,20 @@ static int sdmmc_hardware_init(struct mmc *mmc)
// Ensure we're using System DMA (SDMA) mode for DMA.
regs->host_control &= ~MMC_DMA_SELECT_MASK;
// Turn on the card's power supplies...
rc = sdmmc_enable_supplies(mmc);
if (rc) {
mmc_print(mmc, "ERROR: could power on the card!");
return rc;
}
// ... and verify that the card is there.
if (!sdmmc_card_present(mmc)) {
mmc_print(mmc, "ERROR: no card detected!");
return ENODEV;
}
mmc_print(mmc, "initialized.");
return 0;
}