static zx_status_t sdio_switch_bus_width(sdmmc_device_t *dev, uint32_t bw) {
zx_status_t st = ZX_OK;
if (bw != SDIO_BW_1BIT && bw != SDIO_BW_4BIT) {
return ZX_ERR_NOT_SUPPORTED;
}
if (bw == SDIO_BW_4BIT) {
if ((st = sdio_enable_4bit_bus(dev)) != ZX_OK) {
return st;
}
}
return ZX_OK;
}
/*
* Handle the detection and initialisation of a card.
*
* In the case of a resume, "oldcard" will contain the card
* we're trying to reinitialise.
*/
static int32 mmc_sdio_init_card(void *card)
{
SDM_CARD_INFO* pCard;
int err = SDC_SUCCESS;
pCard = (SDM_CARD_INFO*)card;
/*
* Sanity check the voltages that the card claims to support.
*/
if (pCard->ocr & 0xFF)
pCard->ocr &= ~0xFF;
/*
* Inform the card of the voltage
*/
err = mmc_send_io_op_cond(card, pCard->ocr&USER_SUPPORT_VOLTAGE, NULL);
if (err)
goto remove;
/*
* For native busses: set card RCA and quit open drain mode.
*/
err = mmc_send_relative_addr(card, NULL);
if (err)
goto remove;
/*
* Select card, as all following commands rely on that.
*/
err = mmc_select_card(card, NULL);
if (err)
goto remove;
/*
* Read the common registers.
*/
err = sdio_read_cccr(card);
if (err)
goto remove;
/*
* Read the common CIS tuples.
*/
err = sdio_read_common_cis(card);
if (err)
goto remove;
/*
* If needed, disconnect card detection pull-up resistor.
*/
err = sdio_disable_cd(card);
if (err)
goto remove;
/*
* Switch to high-speed (if supported).
* err == 0/1 [not]support high speed.
*/
err = sdio_enable_hs(card);
if (err > 0)
mmc_card_set_highspeed(pCard); // success to enable high speed.
else if (err)
goto remove;
/*
* Change to the card's maximum speed.
*/
err = SDIOC_UpdateFreq(pCard->SDCPort, SD_FPP_FREQ);//SD_FPP_FREQ SDHC_FPP_FREQ
if (SDC_SUCCESS != err)
goto remove;
pCard->TranSpeed = SD_FPP_FREQ;
pCard->WorkMode |= SDM_HIGH_SPEED_MODE;
/*
* Switch to wider bus (if supported).
*/
err = sdio_enable_4bit_bus(card);
if (err > 0)
; //success to switch 4 bits wide.
else if (err)
goto remove;
return 0;
remove:
return err;
}