On 11 April 2014 13:34, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
> This patch adds HS400 mode support for eMMC5.0 device.
> HS400 mode is high speed DDR interface timing from HS200.
> Clock frequency is up to 200MHz and only 8-bit bus width is
> supported. In addition, tuning process of HS200 is required
> to synchronize the command response on the CMD line because
> CMD input timing for HS400 mode is the same as HS200 mode.
>
> Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
> Tested-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
> Acked-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
Acked-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> ---
> drivers/mmc/core/bus.c | 1 +
> drivers/mmc/core/debugfs.c | 3 +
> drivers/mmc/core/mmc.c | 98 +++++++++++++++++++++++++++++++++++++++++--
> include/linux/mmc/card.h | 1 +
> include/linux/mmc/host.h | 14 ++++++
> include/linux/mmc/mmc.h | 7 +++-
> 6 files changed, 118 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
> index f37e9d6..d2dbf02 100644
> --- a/drivers/mmc/core/bus.c
> +++ b/drivers/mmc/core/bus.c
> @@ -349,6 +349,7 @@ int mmc_add_card(struct mmc_card *card)
> mmc_hostname(card->host),
> mmc_card_uhs(card) ? "ultra high speed " :
> (mmc_card_hs(card) ? "high speed " : ""),
> + mmc_card_hs400(card) ? "HS400 " :
> (mmc_card_hs200(card) ? "HS200 " : ""),
> mmc_card_ddr52(card) ? "DDR " : "",
> uhs_bus_speed_mode, type, card->rca);
> diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
> index 1f730db..91eb162 100644
> --- a/drivers/mmc/core/debugfs.c
> +++ b/drivers/mmc/core/debugfs.c
> @@ -141,6 +141,9 @@ static int mmc_ios_show(struct seq_file *s, void *data)
> case MMC_TIMING_MMC_HS200:
> str = "mmc HS200";
> break;
> + case MMC_TIMING_MMC_HS400:
> + str = "mmc HS400";
> + break;
> default:
> str = "invalid";
> break;
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 7e9b424..c12e247 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -240,7 +240,7 @@ static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
> static void mmc_select_card_type(struct mmc_card *card)
> {
> struct mmc_host *host = card->host;
> - u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK;
> + u8 card_type = card->ext_csd.raw_card_type;
> u32 caps = host->caps, caps2 = host->caps2;
> unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
> unsigned int avail_type = 0;
> @@ -281,6 +281,18 @@ static void mmc_select_card_type(struct mmc_card *card)
> avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
> }
>
> + if (caps2 & MMC_CAP2_HS400_1_8V &&
> + card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
> + hs200_max_dtr = MMC_HS200_MAX_DTR;
> + avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
> + }
> +
> + if (caps2 & MMC_CAP2_HS400_1_2V &&
> + card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
> + hs200_max_dtr = MMC_HS200_MAX_DTR;
> + avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
> + }
> +
> card->ext_csd.hs_max_dtr = hs_max_dtr;
> card->ext_csd.hs200_max_dtr = hs200_max_dtr;
> card->mmc_avail_type = avail_type;
> @@ -499,6 +511,8 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
> ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
> card->ext_csd.raw_pwr_cl_ddr_52_360 =
> ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
> + card->ext_csd.raw_pwr_cl_ddr_200_360 =
> + ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
> }
>
> if (card->ext_csd.rev >= 5) {
> @@ -665,7 +679,10 @@ static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
> (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
> bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
> (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
> - bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]));
> + bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
> + (card->ext_csd.raw_pwr_cl_ddr_200_360 ==
> + bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
> +
> if (err)
> err = -EINVAL;
>
> @@ -776,7 +793,9 @@ static int __mmc_select_powerclass(struct mmc_card *card,
> ext_csd->raw_pwr_cl_52_360 :
> ext_csd->raw_pwr_cl_ddr_52_360;
> else if (host->ios.clock <= MMC_HS200_MAX_DTR)
> - pwrclass_val = ext_csd->raw_pwr_cl_200_360;
> + pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
> + ext_csd->raw_pwr_cl_ddr_200_360 :
> + ext_csd->raw_pwr_cl_200_360;
> break;
> default:
> pr_warning("%s: Voltage range not supported "
> @@ -840,7 +859,8 @@ static void mmc_set_bus_speed(struct mmc_card *card)
> {
> unsigned int max_dtr = (unsigned int)-1;
>
> - if (mmc_card_hs200(card) && max_dtr > card->ext_csd.hs200_max_dtr)
> + if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
> + max_dtr > card->ext_csd.hs200_max_dtr)
> max_dtr = card->ext_csd.hs200_max_dtr;
> else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
> max_dtr = card->ext_csd.hs_max_dtr;
> @@ -993,6 +1013,61 @@ static int mmc_select_hs_ddr(struct mmc_card *card)
> return err;
> }
>
> +static int mmc_select_hs400(struct mmc_card *card)
> +{
> + struct mmc_host *host = card->host;
> + int err = 0;
> +
> + /*
> + * HS400 mode requires 8-bit bus width
> + */
> + if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
> + host->ios.bus_width == MMC_BUS_WIDTH_8))
> + return 0;
> +
> + /*
> + * Before switching to dual data rate operation for HS400,
> + * it is required to convert from HS200 mode to HS mode.
> + */
> + mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
> + mmc_set_bus_speed(card);
> +
> + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
> + card->ext_csd.generic_cmd6_time,
> + true, true, true);
> + if (err) {
> + pr_warn("%s: switch to high-speed from hs200 failed, err:%d\n",
> + mmc_hostname(host), err);
> + return err;
> + }
> +
> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + EXT_CSD_BUS_WIDTH,
> + EXT_CSD_DDR_BUS_WIDTH_8,
> + card->ext_csd.generic_cmd6_time);
> + if (err) {
> + pr_warn("%s: switch to bus width for hs400 failed, err:%d\n",
> + mmc_hostname(host), err);
> + return err;
> + }
> +
> + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS400,
> + card->ext_csd.generic_cmd6_time,
> + true, true, true);
> + if (err) {
> + pr_warn("%s: switch to hs400 failed, err:%d\n",
> + mmc_hostname(host), err);
> + return err;
> + }
> +
> + mmc_set_timing(host, MMC_TIMING_MMC_HS400);
> + mmc_set_bus_speed(card);
> +
> + return 0;
> +}
> +
> /*
> * For device supporting HS200 mode, the following sequence
> * should be done before executing the tuning process.
> @@ -1070,13 +1145,22 @@ bus_speed:
>
> /*
> * Execute tuning sequence to seek the proper bus operating
> - * conditions for HS200, which sends CMD21 to the device.
> + * conditions for HS200 and HS400, which sends CMD21 to the device.
> */
> static int mmc_hs200_tuning(struct mmc_card *card)
> {
> struct mmc_host *host = card->host;
> int err = 0;
>
> + /*
> + * Timing should be adjusted to the HS400 target
> + * operation frequency for tuning process
> + */
> + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
> + host->ios.bus_width == MMC_BUS_WIDTH_8)
> + if (host->ops->prepare_hs400_tuning)
> + host->ops->prepare_hs400_tuning(host, &host->ios);
> +
> if (host->ops->execute_tuning) {
> mmc_host_clk_hold(host);
> err = host->ops->execute_tuning(host,
> @@ -1304,6 +1388,10 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> err = mmc_hs200_tuning(card);
> if (err)
> goto err;
> +
> + err = mmc_select_hs400(card);
> + if (err)
> + goto err;
> } else if (mmc_card_hs(card)) {
> /* Select the desired bus width optionally */
> err = mmc_select_bus_width(card);
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index c422349..e68bbeb 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -110,6 +110,7 @@ struct mmc_ext_csd {
> u8 raw_pwr_cl_200_360; /* 237 */
> u8 raw_pwr_cl_ddr_52_195; /* 238 */
> u8 raw_pwr_cl_ddr_52_360; /* 239 */
> + u8 raw_pwr_cl_ddr_200_360; /* 253 */
> u8 raw_bkops_status; /* 246 */
> u8 raw_sectors[4]; /* 212 - 4 bytes */
>
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index 1ee3c10..1a3ced2 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -61,6 +61,7 @@ struct mmc_ios {
> #define MMC_TIMING_UHS_DDR50 7
> #define MMC_TIMING_MMC_DDR52 8
> #define MMC_TIMING_MMC_HS200 9
> +#define MMC_TIMING_MMC_HS400 10
>
> unsigned char signal_voltage; /* signalling voltage (1.8V or 3.3V) */
>
> @@ -132,6 +133,9 @@ struct mmc_host_ops {
>
> /* The tuning command opcode value is different for SD and eMMC cards */
> int (*execute_tuning)(struct mmc_host *host, u32 opcode);
> +
> + /* Prepare HS400 target operating frequency depending host driver */
> + int (*prepare_hs400_tuning)(struct mmc_host *host, struct mmc_ios *ios);
> int (*select_drive_strength)(unsigned int max_dtr, int host_drv, int card_drv);
> void (*hw_reset)(struct mmc_host *host);
> void (*card_event)(struct mmc_host *host);
> @@ -274,6 +278,10 @@ struct mmc_host {
> #define MMC_CAP2_PACKED_CMD (MMC_CAP2_PACKED_RD | \
> MMC_CAP2_PACKED_WR)
> #define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) /* Don't power up before scan */
> +#define MMC_CAP2_HS400_1_8V (1 << 15) /* Can support HS400 1.8V */
> +#define MMC_CAP2_HS400_1_2V (1 << 16) /* Can support HS400 1.2V */
> +#define MMC_CAP2_HS400 (MMC_CAP2_HS400_1_8V | \
> + MMC_CAP2_HS400_1_2V)
>
> mmc_pm_flag_t pm_caps; /* supported pm features */
>
> @@ -493,4 +501,10 @@ static inline bool mmc_card_ddr52(struct mmc_card *card)
> {
> return card->host->ios.timing == MMC_TIMING_MMC_DDR52;
> }
> +
> +static inline bool mmc_card_hs400(struct mmc_card *card)
> +{
> + return card->host->ios.timing == MMC_TIMING_MMC_HS400;
> +}
> +
> #endif /* LINUX_MMC_HOST_H */
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index f429f13..64ec963 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -325,6 +325,7 @@ struct _mmc_csd {
> #define EXT_CSD_POWER_OFF_LONG_TIME 247 /* RO */
> #define EXT_CSD_GENERIC_CMD6_TIME 248 /* RO */
> #define EXT_CSD_CACHE_SIZE 249 /* RO, 4 bytes */
> +#define EXT_CSD_PWR_CL_DDR_200_360 253 /* RO */
> #define EXT_CSD_TAG_UNIT_SIZE 498 /* RO */
> #define EXT_CSD_DATA_TAG_SUPPORT 499 /* RO */
> #define EXT_CSD_MAX_PACKED_WRITES 500 /* RO */
> @@ -354,7 +355,6 @@ struct _mmc_csd {
> #define EXT_CSD_CMD_SET_SECURE (1<<1)
> #define EXT_CSD_CMD_SET_CPSECURE (1<<2)
>
> -#define EXT_CSD_CARD_TYPE_MASK 0x3F /* Mask out reserved bits */
> #define EXT_CSD_CARD_TYPE_HS_26 (1<<0) /* Card can run at 26MHz */
> #define EXT_CSD_CARD_TYPE_HS_52 (1<<1) /* Card can run at 52MHz */
> #define EXT_CSD_CARD_TYPE_HS (EXT_CSD_CARD_TYPE_HS_26 | \
> @@ -370,6 +370,10 @@ struct _mmc_csd {
> /* SDR mode @1.2V I/O */
> #define EXT_CSD_CARD_TYPE_HS200 (EXT_CSD_CARD_TYPE_HS200_1_8V | \
> EXT_CSD_CARD_TYPE_HS200_1_2V)
> +#define EXT_CSD_CARD_TYPE_HS400_1_8V (1<<6) /* Card can run at 200MHz DDR, 1.8V */
> +#define EXT_CSD_CARD_TYPE_HS400_1_2V (1<<7) /* Card can run at 200MHz DDR, 1.2V */
> +#define EXT_CSD_CARD_TYPE_HS400 (EXT_CSD_CARD_TYPE_HS400_1_8V | \
> + EXT_CSD_CARD_TYPE_HS400_1_2V)
>
> #define EXT_CSD_BUS_WIDTH_1 0 /* Card is in 1 bit mode */
> #define EXT_CSD_BUS_WIDTH_4 1 /* Card is in 4 bit mode */
> @@ -380,6 +384,7 @@ struct _mmc_csd {
> #define EXT_CSD_TIMING_BC 0 /* Backwards compatility */
> #define EXT_CSD_TIMING_HS 1 /* High speed */
> #define EXT_CSD_TIMING_HS200 2 /* HS200 */
> +#define EXT_CSD_TIMING_HS400 3 /* HS400 */
>
> #define EXT_CSD_SEC_ER_EN BIT(0)
> #define EXT_CSD_SEC_BD_BLK_EN BIT(2)
> --
> 1.7.0.4
>
>
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