#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
+#include <linux/mmc/mmc.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/sdio_ids.h>
return ret;
}
-static int sdio_read_cccr(struct mmc_card *card)
+static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
{
int ret;
int cccr_vsn;
+ int uhs = ocr & R4_18V_PRESENT;
unsigned char data;
+ unsigned char speed;
memset(&card->cccr, 0, sizeof(struct sdio_cccr));
}
if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
- ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
+ ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
if (ret)
goto out;
- if (data & SDIO_SPEED_SHS)
- card->cccr.high_speed = 1;
+ card->scr.sda_spec3 = 0;
+ card->sw_caps.sd3_bus_mode = 0;
+ card->sw_caps.sd3_drv_type = 0;
+ if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
+ card->scr.sda_spec3 = 1;
+ ret = mmc_io_rw_direct(card, 0, 0,
+ SDIO_CCCR_UHS, 0, &data);
+ if (ret)
+ goto out;
+
+ if (card->host->caps &
+ (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
+ MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
+ MMC_CAP_UHS_DDR50)) {
+ if (data & SDIO_UHS_DDR50)
+ card->sw_caps.sd3_bus_mode
+ |= SD_MODE_UHS_DDR50;
+
+ if (data & SDIO_UHS_SDR50)
+ card->sw_caps.sd3_bus_mode
+ |= SD_MODE_UHS_SDR50;
+
+ if (data & SDIO_UHS_SDR104)
+ card->sw_caps.sd3_bus_mode
+ |= SD_MODE_UHS_SDR104;
+ }
+
+ ret = mmc_io_rw_direct(card, 0, 0,
+ SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
+ if (ret)
+ goto out;
+
+ if (data & SDIO_DRIVE_SDTA)
+ card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
+ if (data & SDIO_DRIVE_SDTC)
+ card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
+ if (data & SDIO_DRIVE_SDTD)
+ card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
+ }
+
+ /* if no uhs mode ensure we check for high speed */
+ if (!card->sw_caps.sd3_bus_mode) {
+ if (speed & SDIO_SPEED_SHS) {
+ card->cccr.high_speed = 1;
+ card->sw_caps.hs_max_dtr = 50000000;
+ } else {
+ card->cccr.high_speed = 0;
+ card->sw_caps.hs_max_dtr = 25000000;
+ }
+ }
}
out:
return max_dtr;
}
+static unsigned char host_drive_to_sdio_drive(int host_strength)
+{
+ switch (host_strength) {
+ case MMC_SET_DRIVER_TYPE_A:
+ return SDIO_DTSx_SET_TYPE_A;
+ case MMC_SET_DRIVER_TYPE_B:
+ return SDIO_DTSx_SET_TYPE_B;
+ case MMC_SET_DRIVER_TYPE_C:
+ return SDIO_DTSx_SET_TYPE_C;
+ case MMC_SET_DRIVER_TYPE_D:
+ return SDIO_DTSx_SET_TYPE_D;
+ default:
+ return SDIO_DTSx_SET_TYPE_B;
+ }
+}
+
+static void sdio_select_driver_type(struct mmc_card *card)
+{
+ int host_drv_type = SD_DRIVER_TYPE_B;
+ int card_drv_type = SD_DRIVER_TYPE_B;
+ int drive_strength;
+ unsigned char card_strength;
+ int err;
+
+ /*
+ * If the host doesn't support any of the Driver Types A,C or D,
+ * or there is no board specific handler then default Driver
+ * Type B is used.
+ */
+ if (!(card->host->caps &
+ (MMC_CAP_DRIVER_TYPE_A |
+ MMC_CAP_DRIVER_TYPE_C |
+ MMC_CAP_DRIVER_TYPE_D)))
+ return;
+
+ if (!card->host->ops->select_drive_strength)
+ return;
+
+ if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
+ host_drv_type |= SD_DRIVER_TYPE_A;
+
+ if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
+ host_drv_type |= SD_DRIVER_TYPE_C;
+
+ if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
+ host_drv_type |= SD_DRIVER_TYPE_D;
+
+ if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
+ card_drv_type |= SD_DRIVER_TYPE_A;
+
+ if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
+ card_drv_type |= SD_DRIVER_TYPE_C;
+
+ if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
+ card_drv_type |= SD_DRIVER_TYPE_D;
+
+ /*
+ * The drive strength that the hardware can support
+ * depends on the board design. Pass the appropriate
+ * information and let the hardware specific code
+ * return what is possible given the options
+ */
+ drive_strength = card->host->ops->select_drive_strength(
+ card->sw_caps.uhs_max_dtr,
+ host_drv_type, card_drv_type);
+
+ /* if error just use default for drive strength B */
+ err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
+ &card_strength);
+ if (err)
+ return;
+
+ card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
+ card_strength |= host_drive_to_sdio_drive(drive_strength);
+
+ err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
+ card_strength, NULL);
+
+ /* if error default to drive strength B */
+ if (!err)
+ mmc_set_driver_type(card->host, drive_strength);
+}
+
+
+static int sdio_set_bus_speed_mode(struct mmc_card *card)
+{
+ unsigned int bus_speed, timing;
+ int err;
+ unsigned char speed;
+
+ /*
+ * If the host doesn't support any of the UHS-I modes, fallback on
+ * default speed.
+ */
+ if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
+ MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
+ return 0;
+
+ bus_speed = SDIO_SPEED_SDR12;
+ timing = MMC_TIMING_UHS_SDR12;
+ if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
+ (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
+ bus_speed = SDIO_SPEED_SDR104;
+ timing = MMC_TIMING_UHS_SDR104;
+ card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
+ } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
+ (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
+ bus_speed = SDIO_SPEED_DDR50;
+ timing = MMC_TIMING_UHS_DDR50;
+ card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
+ } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
+ MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
+ SD_MODE_UHS_SDR50)) {
+ bus_speed = SDIO_SPEED_SDR50;
+ timing = MMC_TIMING_UHS_SDR50;
+ card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
+ } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
+ MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
+ (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
+ bus_speed = SDIO_SPEED_SDR25;
+ timing = MMC_TIMING_UHS_SDR25;
+ card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
+ } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
+ MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
+ MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
+ SD_MODE_UHS_SDR12)) {
+ bus_speed = SDIO_SPEED_SDR12;
+ timing = MMC_TIMING_UHS_SDR12;
+ card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
+ }
+
+ err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
+ if (err)
+ return err;
+
+ speed &= ~SDIO_SPEED_BSS_MASK;
+ speed |= bus_speed;
+ err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
+ if (err)
+ return err;
+
+ if (bus_speed) {
+ mmc_set_timing(card->host, timing);
+ mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
+ }
+
+ return 0;
+}
+
+/*
+ * UHS-I specific initialization procedure
+ */
+static int mmc_sdio_init_uhs_card(struct mmc_card *card)
+{
+ int err;
+
+ if (!card->scr.sda_spec3)
+ return 0;
+
+ /*
+ * Switch to wider bus (if supported).
+ */
+ if (card->host->caps & MMC_CAP_4_BIT_DATA) {
+ err = sdio_enable_4bit_bus(card);
+ if (err > 0) {
+ mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
+ err = 0;
+ }
+ }
+
+ /* Set the driver strength for the card */
+ sdio_select_driver_type(card);
+
+ /* Set bus speed mode of the card */
+ err = sdio_set_bus_speed_mode(card);
+ if (err)
+ goto out;
+
+ /* Initialize and start re-tuning timer */
+ if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
+ err = card->host->ops->execute_tuning(card->host,
+ MMC_SEND_TUNING_BLOCK);
+
+out:
+
+ return err;
+}
+
/*
* Handle the detection and initialisation of a card.
*
if (host->ops->init_card)
host->ops->init_card(host, card);
+ /*
+ * If the host and card support UHS-I mode request the card
+ * to switch to 1.8V signaling level. No 1.8v signalling if
+ * UHS mode is not enabled to maintain compatibilty and some
+ * systems that claim 1.8v signalling in fact do not support
+ * it.
+ */
+ if ((ocr & R4_18V_PRESENT) &&
+ (host->caps &
+ (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
+ MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
+ MMC_CAP_UHS_DDR50))) {
+ err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
+ true);
+ if (err) {
+ ocr &= ~R4_18V_PRESENT;
+ host->ocr &= ~R4_18V_PRESENT;
+ }
+ err = 0;
+ } else {
+ ocr &= ~R4_18V_PRESENT;
+ host->ocr &= ~R4_18V_PRESENT;
+ }
+
/*
* For native busses: set card RCA and quit open drain mode.
*/
/*
* Read the common registers.
*/
- err = sdio_read_cccr(card);
+ err = sdio_read_cccr(card, ocr);
if (err)
goto remove;
if (err)
goto remove;
- /*
- * Switch to high-speed (if supported).
- */
- err = sdio_enable_hs(card);
- if (err > 0)
- mmc_sd_go_highspeed(card);
- else if (err)
- goto remove;
+ /* Initialization sequence for UHS-I cards */
+ /* Only if card supports 1.8v and UHS signaling */
+ if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
+ err = mmc_sdio_init_uhs_card(card);
+ if (err)
+ goto remove;
- /*
- * Change to the card's maximum speed.
- */
- mmc_set_clock(host, mmc_sdio_get_max_clock(card));
+ /* Card is an ultra-high-speed card */
+ mmc_card_set_uhs(card);
+ } else {
+ /*
+ * Switch to high-speed (if supported).
+ */
+ err = sdio_enable_hs(card);
+ if (err > 0)
+ mmc_sd_go_highspeed(card);
+ else if (err)
+ goto remove;
- /*
- * Switch to wider bus (if supported).
- */
- err = sdio_enable_4bit_bus(card);
- if (err > 0)
- mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
- else if (err)
- goto remove;
+ /*
+ * Change to the card's maximum speed.
+ */
+ mmc_set_clock(host, mmc_sdio_get_max_clock(card));
+ /*
+ * Switch to wider bus (if supported).
+ */
+ err = sdio_enable_4bit_bus(card);
+ if (err > 0)
+ mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
+ else if (err)
+ goto remove;
+ }
finish:
if (!oldcard)
host->card = card;
host->card = NULL;
}
+/*
+ * Card detection - card is alive.
+ */
+static int mmc_sdio_alive(struct mmc_host *host)
+{
+ return mmc_select_card(host->card);
+}
+
/*
* Card detection callback from host.
*/
/*
* Just check if our card has been removed.
*/
- err = mmc_select_card(host->card);
+ err = _mmc_detect_card_removed(host);
mmc_release_host(host);
.suspend = mmc_sdio_suspend,
.resume = mmc_sdio_resume,
.power_restore = mmc_sdio_power_restore,
+ .alive = mmc_sdio_alive,
};
* Detect and init the card.
*/
err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
- if (err)
- goto err;
+ if (err) {
+ if (err == -EAGAIN) {
+ /*
+ * Retry initialization with S18R set to 0.
+ */
+ host->ocr &= ~R4_18V_PRESENT;
+ err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
+ }
+ if (err)
+ goto err;
+ }
card = host->card;
/*
projects / ~andy / linux / blobdiff