[U-Boot] [PATCH 20/22] mmc: Add support for UHS modes
Jaehoon Chung
jh80.chung at samsung.com
Wed May 17 01:59:34 UTC 2017
On 05/16/2017 11:20 PM, Jean-Jacques Hiblot wrote:
>
>
> On 12/05/2017 20:16, Jean-Jacques Hiblot wrote:
>> Add UHS modes to the list of supported modes, get the UHS capabilites of
>> the SDcard and implement the procedure to switch the voltage (UHS modes
>> use 1v8 IO lines)
>> During the voltage switch procedure, DAT0 is used by the card to signal
>> when it's ready. The optional card_busy() callback can be used to get this
>> information from the host driver.
>>
>> Signed-off-by: Jean-Jacques Hiblot <jjhiblot at ti.com>
>> ---
>> drivers/mmc/mmc.c | 169 +++++++++++++++++++++++++++++++++++++++++++++++++++---
>> include/mmc.h | 27 ++++++++-
>> 2 files changed, 188 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
>> index f6509f1..074d286 100644
>> --- a/drivers/mmc/mmc.c
>> +++ b/drivers/mmc/mmc.c
>> @@ -31,6 +31,7 @@ static const unsigned int sd_au_size[] = {
>> };
>> static int mmc_set_signal_voltage(struct mmc *mmc, uint signal_voltage);
>> static void mmc_power_cycle(struct mmc *mmc);
>> +static int mmc_card_busy(struct mmc *mmc);
>> #if CONFIG_IS_ENABLED(MMC_TINY)
>> static struct mmc mmc_static;
>> @@ -403,7 +404,68 @@ static int mmc_go_idle(struct mmc *mmc)
>> return 0;
>> }
>> -static int sd_send_op_cond(struct mmc *mmc)
>> +static int mmc_switch_voltage(struct mmc *mmc, int signal_voltage)
>> +{
>> + struct mmc_cmd cmd;
>> + int err = 0;
>> +
>> + /*
>> + * Send CMD11 only if the request is to switch the card to
>> + * 1.8V signalling.
>> + */
>> + if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
>> + return mmc_set_signal_voltage(mmc, signal_voltage);
>> +
>> + cmd.cmdidx = SD_CMD_SWITCH_UHS18V;
>> + cmd.cmdarg = 0;
>> + cmd.resp_type = MMC_RSP_R1;
>> +
>> + err = mmc_send_cmd(mmc, &cmd, NULL);
>> + if (err)
>> + goto fail;
>> +
>> + if (!mmc_host_is_spi(host) && (cmd.response[0] & MMC_STATUS_ERROR))
>> + goto fail;
>> +
>> + /*
>> + * The card should drive cmd and dat[0:3] low immediately
>> + * after the response of cmd11, but wait 1 ms to be sure
>> + */
>> + udelay(1000);
>> + if (mmc_card_busy(mmc))
> Hi all,
>
> there is an error her that I let through while cleaning the code before posting.
> The line above should be: if (!mmc_card_busy(mmc)).
> I'll fix this in the v2.
>
> Jaehoon, if you're testing the patches you might want to fix this first (you can just remove the calls to mmc_card_busy() for the moment). I hope it did not impede you.
Thanks for noticing. :)
Best Regards,
Jaehoon Chung
>
> Jean-Jacques
>> + goto fail;
>> +
>> + /*
>> + * During a signal voltage level switch, the clock must be gated
>> + * for 5 ms according to the SD spec
>> + */
>> + mmc_set_clock(mmc, mmc->clock, true);
>> +
>> + err = mmc_set_signal_voltage(mmc, signal_voltage);
>> + if (err)
>> + goto fail;
>> +
>> + /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
>> + udelay(10000);
>> + mmc_set_clock(mmc, mmc->clock, false);
>> +
>> + /* Wait for at least 1 ms according to spec */
>> + udelay(1000);
>> +
>> + /*
>> + * Failure to switch is indicated by the card holding
>> + * dat[0:3] low
>> + */
>> + if (mmc_card_busy(mmc))
>> + goto fail;
>> +
>> + return 0;
>> +
>> +fail:
>> + return -EIO;
>> +}
>> +
>> +static int sd_send_op_cond(struct mmc *mmc, bool uhs_en)
>> {
>> int timeout = 1000;
>> int err;
>> @@ -435,6 +497,9 @@ static int sd_send_op_cond(struct mmc *mmc)
>> if (mmc->version == SD_VERSION_2)
>> cmd.cmdarg |= OCR_HCS;
>> + if (uhs_en)
>> + cmd.cmdarg |= OCR_S18R;
>> +
>> err = mmc_send_cmd(mmc, &cmd, NULL);
>> if (err)
>> @@ -465,6 +530,13 @@ static int sd_send_op_cond(struct mmc *mmc)
>> mmc->ocr = cmd.response[0];
>> + if (!(mmc_host_is_spi(mmc)) && (cmd.response[0] & 0x41000000)
>> + == 0x41000000) {
>> + err = mmc_switch_voltage(mmc, MMC_SIGNAL_VOLTAGE_180);
>> + if (err)
>> + return err;
>> + }
>> +
>> mmc->high_capacity = ((mmc->ocr & OCR_HCS) == OCR_HCS);
>> mmc->rca = 0;
>> @@ -977,6 +1049,7 @@ static int sd_get_capabilities(struct mmc *mmc)
>> ALLOC_CACHE_ALIGN_BUFFER(uint, switch_status, 16);
>> struct mmc_data data;
>> int timeout;
>> + u32 sd3_bus_mode;
>> mmc->card_caps = MMC_MODE_1BIT;
>> @@ -1058,6 +1131,22 @@ retry_scr:
>> if (__be32_to_cpu(switch_status[3]) & SD_HIGHSPEED_SUPPORTED)
>> mmc->card_caps |= MMC_CAP(SD_HS);
>> + /* Version before 3.0 don't support UHS modes */
>> + if (mmc->version < SD_VERSION_3)
>> + return 0;
>> +
>> + sd3_bus_mode = __be32_to_cpu(switch_status[3]) >> 16 & 0x1f;
>> + if (sd3_bus_mode & SD_MODE_UHS_SDR104)
>> + mmc->card_caps |= MMC_CAP(UHS_SDR104);
>> + if (sd3_bus_mode & SD_MODE_UHS_SDR50)
>> + mmc->card_caps |= MMC_CAP(UHS_SDR50);
>> + if (sd3_bus_mode & SD_MODE_UHS_SDR25)
>> + mmc->card_caps |= MMC_CAP(UHS_SDR25);
>> + if (sd3_bus_mode & SD_MODE_UHS_SDR12)
>> + mmc->card_caps |= MMC_CAP(UHS_SDR12);
>> + if (sd3_bus_mode & SD_MODE_UHS_DDR50)
>> + mmc->card_caps |= MMC_CAP(UHS_DDR50);
>> +
>> return 0;
>> }
>> @@ -1065,13 +1154,36 @@ static int sd_set_card_speed(struct mmc *mmc, enum bus_mode mode)
>> {
>> int err;
>> ALLOC_CACHE_ALIGN_BUFFER(uint, switch_status, 16);
>> + int speed;
>> +
>> + switch (mode) {
>> + case SD_LEGACY:
>> + case UHS_SDR12:
>> + speed = UHS_SDR12_BUS_SPEED;
>> + break;
>> + case SD_HS:
>> + case UHS_SDR25:
>> + speed = UHS_SDR25_BUS_SPEED;
>> + break;
>> + case UHS_SDR50:
>> + speed = UHS_SDR50_BUS_SPEED;
>> + break;
>> + case UHS_DDR50:
>> + speed = UHS_DDR50_BUS_SPEED;
>> + break;
>> + case UHS_SDR104:
>> + speed = UHS_SDR104_BUS_SPEED;
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> - err = sd_switch(mmc, SD_SWITCH_SWITCH, 0, 1, (u8 *)switch_status);
>> + err = sd_switch(mmc, SD_SWITCH_SWITCH, 0, speed, (u8 *)switch_status);
>> if (err)
>> return err;
>> - if ((__be32_to_cpu(switch_status[4]) & 0x0f000000) != 0x01000000)
>> + if ((__be32_to_cpu(switch_status[4]) >> 24) != speed)
>> return -ENOTSUPP;
>> return 0;
>> @@ -1291,10 +1403,31 @@ static int mmc_set_signal_voltage(struct mmc *mmc, uint signal_voltage)
>> static const struct mode_width_tuning sd_modes_by_pref[] = {
>> {
>> + .mode = UHS_SDR104,
>> + .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
>> + .tuning = MMC_SEND_TUNING_BLOCK
>> + },
>> + {
>> + .mode = UHS_SDR50,
>> + .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
>> + },
>> + {
>> + .mode = UHS_DDR50,
>> + .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
>> + },
>> + {
>> + .mode = UHS_SDR25,
>> + .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
>> + },
>> + {
>> .mode = SD_HS,
>> .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
>> },
>> {
>> + .mode = UHS_SDR12,
>> + .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
>> + },
>> + {
>> .mode = SD_LEGACY,
>> .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
>> }
>> @@ -1310,18 +1443,24 @@ static int sd_select_mode_and_width(struct mmc *mmc)
>> int err;
>> uint widths[] = {MMC_MODE_4BIT, MMC_MODE_1BIT};
>> const struct mode_width_tuning *mwt;
>> + bool uhs_en = (mmc->ocr & OCR_S18R) ? true : false;
>> + uint caps;
>> +
>> err = sd_get_capabilities(mmc);
>> if (err)
>> return err;
>> /* Restrict card's capabilities by what the host can do */
>> - mmc->card_caps &= (mmc->cfg->host_caps | MMC_MODE_1BIT);
>> + caps = mmc->card_caps & (mmc->cfg->host_caps | MMC_MODE_1BIT);
>> - for_each_sd_mode_by_pref(mmc->card_caps, mwt) {
>> + if (!uhs_en)
>> + caps &= ~UHS_CAPS;
>> +
>> + for_each_sd_mode_by_pref(caps, mwt) {
>> uint *w;
>> for (w = widths; w < widths + ARRAY_SIZE(widths); w++) {
>> - if (*w & mmc->card_caps & mwt->widths) {
>> + if (*w & caps & mwt->widths) {
>> debug("trying mode %s width %d (at %d MHz)\n",
>> mmc_mode_name(mwt->mode),
>> bus_width(*w),
>> @@ -1342,6 +1481,16 @@ static int sd_select_mode_and_width(struct mmc *mmc)
>> mmc_select_mode(mmc, mwt->mode);
>> mmc_set_clock(mmc, mmc->tran_speed, false);
>> + /* execute tuning if needed */
>> + if (mwt->tuning && !mmc_host_is_spi(mmc)) {
>> + err = mmc_execute_tuning(mmc,
>> + mwt->tuning);
>> + if (err) {
>> + debug("tuning failed\n");
>> + goto error;
>> + }
>> + }
>> +
>> err = sd_read_ssr(mmc);
>> if (!err)
>> return 0;
>> @@ -1993,6 +2142,7 @@ static void mmc_power_cycle(struct mmc *mmc)
>> int mmc_start_init(struct mmc *mmc)
>> {
>> bool no_card;
>> + bool uhs_en = supports_uhs(mmc->cfg->host_caps);
>> int err;
>> /* we pretend there's no card when init is NULL */
>> @@ -2028,6 +2178,7 @@ int mmc_start_init(struct mmc *mmc)
>> #endif
>> mmc->ddr_mode = 0;
>> +retry:
>> mmc_power_cycle(mmc);
>> /* Reset the Card */
>> @@ -2043,7 +2194,11 @@ int mmc_start_init(struct mmc *mmc)
>> err = mmc_send_if_cond(mmc);
>> /* Now try to get the SD card's operating condition */
>> - err = sd_send_op_cond(mmc);
>> + err = sd_send_op_cond(mmc, uhs_en);
>> + if (err && uhs_en) {
>> + uhs_en = false;
>> + goto retry;
>> + }
>> /* If the command timed out, we check for an MMC card */
>> if (err == -ETIMEDOUT) {
>> diff --git a/include/mmc.h b/include/mmc.h
>> index b42f686..775c47e 100644
>> --- a/include/mmc.h
>> +++ b/include/mmc.h
>> @@ -87,6 +87,7 @@
>> #define MMC_CMD_SET_BLOCKLEN 16
>> #define MMC_CMD_READ_SINGLE_BLOCK 17
>> #define MMC_CMD_READ_MULTIPLE_BLOCK 18
>> +#define MMC_SEND_TUNING_BLOCK 19
>> #define MMC_SEND_TUNING_BLOCK_HS200 21
>> #define MMC_CMD_SET_BLOCK_COUNT 23
>> #define MMC_CMD_WRITE_SINGLE_BLOCK 24
>> @@ -117,7 +118,8 @@
>> static inline bool mmc_is_tuning_cmd(uint cmdidx)
>> {
>> - if (cmdidx == MMC_SEND_TUNING_BLOCK_HS200)
>> + if ((cmdidx == MMC_SEND_TUNING_BLOCK_HS200) ||
>> + (cmdidx == MMC_SEND_TUNING_BLOCK))
>> return true;
>> return false;
>> }
>> @@ -126,8 +128,22 @@ static inline bool mmc_is_tuning_cmd(uint cmdidx)
>> #define SD_HIGHSPEED_BUSY 0x00020000
>> #define SD_HIGHSPEED_SUPPORTED 0x00020000
>> +#define UHS_SDR12_BUS_SPEED 0
>> +#define HIGH_SPEED_BUS_SPEED 1
>> +#define UHS_SDR25_BUS_SPEED 1
>> +#define UHS_SDR50_BUS_SPEED 2
>> +#define UHS_SDR104_BUS_SPEED 3
>> +#define UHS_DDR50_BUS_SPEED 4
>> +
>> +#define SD_MODE_UHS_SDR12 (1 << UHS_SDR12_BUS_SPEED)
>> +#define SD_MODE_UHS_SDR25 (1 << UHS_SDR25_BUS_SPEED)
>> +#define SD_MODE_UHS_SDR50 (1 << UHS_SDR50_BUS_SPEED)
>> +#define SD_MODE_UHS_SDR104 (1 << UHS_SDR104_BUS_SPEED)
>> +#define SD_MODE_UHS_DDR50 (1 << UHS_DDR50_BUS_SPEED)
>> +
>> #define OCR_BUSY 0x80000000
>> #define OCR_HCS 0x40000000
>> +#define OCR_S18R 0x1000000
>> #define OCR_VOLTAGE_MASK 0x007FFF80
>> #define OCR_ACCESS_MODE 0x60000000
>> @@ -490,6 +506,15 @@ static inline bool mmc_is_mode_ddr(enum bus_mode mode)
>> return false;
>> }
>> +#define UHS_CAPS (MMC_CAP(UHS_SDR12) | MMC_CAP(UHS_SDR25) | \
>> + MMC_CAP(UHS_SDR50) | MMC_CAP(UHS_SDR104) | \
>> + MMC_CAP(UHS_DDR50))
>> +
>> +static inline bool supports_uhs(uint caps)
>> +{
>> + return (caps & UHS_CAPS) ? true : false;
>> +}
>> +
>> /*
>> * With CONFIG_DM_MMC enabled, struct mmc can be accessed from the MMC device
>
>
>
>
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