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SubjectRe: [PATCH v4] mmc: dw_mmc-k3: add sd support for hi3660
Hi, Ulf, Jaehoon

Sorry to disturb. Would it be possible to get some of your bandwidth
on this patch? Would you please give us your opinion?

Thank you.

-Guodong


On Tue, Jun 13, 2017 at 3:25 PM, liwei <liwei213@huawei.com> wrote:
> Add sd card support for hi3660 soc
>
> Signed-off-by: Li Wei <liwei213@huawei.com>
> Signed-off-by: Chen Jun <chenjun14@huawei.com>
>
> Major changes in v3:
> - solve review comments from Heiner Kallweit.
> *use the GENMASK and FIELD_PREP macros replace the bit shift operation.
> *use usleep_range() replace udelay() and mdelay().
>
> Major changes in v4:
> - solve review comments from Jaehoon Chung.
> *move common register for dwmmc controller to dwmmc header file.
> *modify definitions type of some register variables.
> *get rid of the magic numbers.
> ---
> drivers/mmc/host/dw_mmc-k3.c | 313 +++++++++++++++++++++++++++++++++++++++++++
> drivers/mmc/host/dw_mmc.h | 2 +
> 2 files changed, 315 insertions(+)
>
> diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
> index e38fb0020bb1..c63e91ab775e 100644
> --- a/drivers/mmc/host/dw_mmc-k3.c
> +++ b/drivers/mmc/host/dw_mmc-k3.c
> @@ -8,6 +8,8 @@
> * (at your option) any later version.
> */
>
> +#include <linux/bitops.h>
> +#include <linux/bitfield.h>
> #include <linux/clk.h>
> #include <linux/mfd/syscon.h>
> #include <linux/mmc/host.h>
> @@ -28,7 +30,38 @@
> #define AO_SCTRL_SEL18 BIT(10)
> #define AO_SCTRL_CTRL3 0x40C
>
> +#define DWMMC_SDIO_ID 2
> +
> +#define SOC_SCTRL_SCPERCTRL5 (0x314)
> +#define SDCARD_IO_SEL18 BIT(2)
> +
> +#define SDCARD_RD_THRESHOLD (512)
> +
> +#define GENCLK_DIV (7)
> +
> +#define GPIO_CLK_ENABLE BIT(16)
> +#define GPIO_CLK_DIV_MASK GENMASK(11, 8)
> +#define GPIO_USE_SAMPLE_DLY_MASK GENMASK(13, 13)
> +#define UHS_REG_EXT_SAMPLE_PHASE_MASK GENMASK(20, 16)
> +#define UHS_REG_EXT_SAMPLE_DRVPHASE_MASK GENMASK(25, 21)
> +#define UHS_REG_EXT_SAMPLE_DLY_MASK GENMASK(30, 26)
> +
> +#define TIMING_MODE 3
> +#define TIMING_CFG_NUM 10
> +
> +#define PULL_DOWN BIT(1)
> +#define PULL_UP BIT(0)
> +
> +#define NUM_PHASES (40)
> +
> +#define ENABLE_SHIFT_MIN_SMPL (4)
> +#define ENABLE_SHIFT_MAX_SMPL (12)
> +#define USE_DLY_MIN_SMPL (11)
> +#define USE_DLY_MAX_SMPL (14)
> +
> struct k3_priv {
> + int ctrl_id;
> + u32 cur_speed;
> struct regmap *reg;
> };
>
> @@ -38,6 +71,41 @@ static unsigned long dw_mci_hi6220_caps[] = {
> 0
> };
>
> +struct hs_timing {
> + u32 drv_phase;
> + u32 smpl_dly;
> + u32 smpl_phase_max;
> + u32 smpl_phase_min;
> +};
> +
> +struct hs_timing hs_timing_cfg[TIMING_MODE][TIMING_CFG_NUM] = {
> + { /* reserved */ },
> + { /* SD */
> + {7, 0, 15, 15,}, /* 0: LEGACY 400k */
> + {6, 0, 4, 4,}, /* 1: MMC_HS */
> + {6, 0, 3, 3,}, /* 2: SD_HS */
> + {6, 0, 15, 15,}, /* 3: SDR12 */
> + {6, 0, 2, 2,}, /* 4: SDR25 */
> + {4, 0, 11, 0,}, /* 5: SDR50 */
> + {6, 4, 15, 0,}, /* 6: SDR104 */
> + {0}, /* 7: DDR50 */
> + {0}, /* 8: DDR52 */
> + {0}, /* 9: HS200 */
> + },
> + { /* SDIO */
> + {7, 0, 15, 15,}, /* 0: LEGACY 400k */
> + {0}, /* 1: MMC_HS */
> + {6, 0, 15, 15,}, /* 2: SD_HS */
> + {6, 0, 15, 15,}, /* 3: SDR12 */
> + {6, 0, 0, 0,}, /* 4: SDR25 */
> + {4, 0, 12, 0,}, /* 5: SDR50 */
> + {5, 4, 15, 0,}, /* 6: SDR104 */
> + {0}, /* 7: DDR50 */
> + {0}, /* 8: DDR52 */
> + {0}, /* 9: HS200 */
> + }
> +};
> +
> static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios)
> {
> int ret;
> @@ -66,6 +134,10 @@ static int dw_mci_hi6220_parse_dt(struct dw_mci *host)
> if (IS_ERR(priv->reg))
> priv->reg = NULL;
>
> + priv->ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
> + if (priv->ctrl_id < 0)
> + priv->ctrl_id = 0;
> +
> host->priv = priv;
> return 0;
> }
> @@ -144,7 +216,243 @@ static const struct dw_mci_drv_data hi6220_data = {
> .execute_tuning = dw_mci_hi6220_execute_tuning,
> };
>
> +static void dw_mci_hs_set_timing(struct dw_mci *host, int timing, int smpl_phase)
> +{
> + u32 drv_phase;
> + u32 smpl_dly;
> + u32 use_smpl_dly = 0;
> + u32 enable_shift = 0;
> + u32 reg_value;
> + int ctrl_id;
> + struct k3_priv *priv;
> +
> + priv = host->priv;
> + ctrl_id = priv->ctrl_id;
> +
> + drv_phase = hs_timing_cfg[ctrl_id][timing].drv_phase;
> + smpl_dly = hs_timing_cfg[ctrl_id][timing].smpl_dly;
> + if (smpl_phase == -1)
> + smpl_phase = (hs_timing_cfg[ctrl_id][timing].smpl_phase_max +
> + hs_timing_cfg[ctrl_id][timing].smpl_phase_min) / 2;
> +
> + switch (timing) {
> + case MMC_TIMING_UHS_SDR104:
> + if (smpl_phase >= USE_DLY_MIN_SMPL &&
> + smpl_phase <= USE_DLY_MAX_SMPL)
> + use_smpl_dly = 1;
> + case MMC_TIMING_UHS_SDR50:
> + if (smpl_phase >= ENABLE_SHIFT_MIN_SMPL &&
> + smpl_phase <= ENABLE_SHIFT_MAX_SMPL) {
> + enable_shift = 1;
> + break;
> + }
> + }
> +
> + mci_writel(host, GPIO, 0x0);
> + usleep_range(5, 10);
> +
> + reg_value = FIELD_PREP(UHS_REG_EXT_SAMPLE_PHASE_MASK, smpl_phase) |\
> + FIELD_PREP(UHS_REG_EXT_SAMPLE_DLY_MASK ,smpl_dly) |\
> + FIELD_PREP(UHS_REG_EXT_SAMPLE_DRVPHASE_MASK,drv_phase);
> + mci_writel(host, UHS_REG_EXT, reg_value);
> +
> + mci_writel(host, ENABLE_SHIFT, enable_shift);
> +
> + reg_value = FIELD_PREP(GPIO_CLK_DIV_MASK, GENCLK_DIV) |\
> + FIELD_PREP(GPIO_USE_SAMPLE_DLY_MASK,use_smpl_dly);
> + mci_writel(host, GPIO, (unsigned int)reg_value | GPIO_CLK_ENABLE);
> +
> + /* We should delay 1ms wait for timing setting finished. */
> + usleep_range(1000, 2000);
> +}
> +
> +static int dw_mci_hi3660_init(struct dw_mci *host)
> +{
> + mci_writel(host, CDTHRCTL, SDMMC_SET_THLD(SDCARD_RD_THRESHOLD,
> + SDMMC_CARD_RD_THR_EN));
> +
> + dw_mci_hs_set_timing(host, MMC_TIMING_LEGACY, -1);
> + host->bus_hz /= (GENCLK_DIV + 1);
> +
> + return 0;
> +}
> +
> +static int dw_mci_set_sel18(struct dw_mci *host, bool set)
> +{
> + int ret;
> + unsigned int val;
> + struct k3_priv *priv;
> +
> + priv = host->priv;
> +
> + val = set ? SDCARD_IO_SEL18 : 0;
> + ret = regmap_update_bits(priv->reg, SOC_SCTRL_SCPERCTRL5,
> + SDCARD_IO_SEL18, val);
> + if (ret) {
> + dev_err(host->dev, "sel18 %u error\n", val);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +void dw_mci_hi3660_set_ios(struct dw_mci *host, struct mmc_ios *ios)
> +{
> + int ret;
> + unsigned long wanted;
> + unsigned long actual;
> + struct k3_priv *priv = host->priv;
> +
> + if (!ios->clock || ios->clock == priv->cur_speed)
> + return;
> +
> + wanted = ios->clock * (GENCLK_DIV + 1);
> + ret = clk_set_rate(host->ciu_clk, wanted);
> + if (ret) {
> + dev_err(host->dev, "failed to set rate %luHz\n", wanted);
> + return;
> + }
> + actual = clk_get_rate(host->ciu_clk);
> +
> + dw_mci_hs_set_timing(host, ios->timing, -1);
> + host->bus_hz = actual / (GENCLK_DIV + 1);
> + host->current_speed = 0;
> + priv->cur_speed = host->bus_hz;
> +}
> +
> +static int dw_mci_get_best_clksmpl(unsigned int sample_flag)
> +{
> + int i;
> + int interval;
> + unsigned int v;
> + unsigned int len;
> + unsigned int range_start = 0;
> + unsigned int range_length = 0;
> + unsigned int middle_range = 0;
> +
> + if (!sample_flag)
> + return -EIO;
> +
> + if (~sample_flag == 0)
> + return 0;
> +
> + i = ffs(sample_flag) - 1;
> +
> + /*A clock cycle is divided into 32 phases,
> + *each of which is represented by a bit, finding the optimal phase.
> + */
> + while (i < 32) {
> + v = ror32(sample_flag, i);
> + len = ffs(~v) - 1;
> +
> + if (len > range_length) {
> + range_length = len;
> + range_start = i;
> + }
> +
> + interval = ffs(v >> len) - 1;
> + if (interval < 0)
> + break;
> +
> + i += len + interval;
> + }
> +
> + middle_range = range_start + range_length / 2;
> + if (middle_range >= 32)
> + middle_range %= 32;
> +
> + return middle_range;
> +}
> +
> +static int dw_mci_hi3660_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
> +{
> + int i = 0;
> + struct dw_mci *host = slot->host;
> + struct mmc_host *mmc = slot->mmc;
> + int smpl_phase = 0;
> + u32 tuning_sample_flag = 0;
> + int best_clksmpl = 0;
> +
> + for (i = 0; i < NUM_PHASES; ++i, ++smpl_phase) {
> + smpl_phase %= 32;
> +
> + mci_writel(host, TMOUT, ~0);
> + dw_mci_hs_set_timing(host, mmc->ios.timing, smpl_phase);
> +
> + if (!mmc_send_tuning(mmc, opcode, NULL))
> + tuning_sample_flag |= (1 << smpl_phase);
> + else
> + tuning_sample_flag &= ~(1 << smpl_phase);
> + }
> +
> + best_clksmpl = dw_mci_get_best_clksmpl(tuning_sample_flag);
> + if (best_clksmpl < 0) {
> + dev_err(host->dev, "All phases bad!\n");
> + return -EIO;
> + }
> +
> + dw_mci_hs_set_timing(host, mmc->ios.timing, best_clksmpl);
> +
> + dev_info(host->dev, "tuning ok best_clksmpl %u tuning_sample_flag %x\n",
> + best_clksmpl, tuning_sample_flag);
> + return 0;
> +}
> +
> +static int dw_mci_hi3660_switch_voltage(struct mmc_host *mmc,
> + struct mmc_ios *ios)
> +{
> + int ret;
> + int min_uv = 0;
> + int max_uv = 0;
> + struct dw_mci_slot *slot = mmc_priv(mmc);
> + struct k3_priv *priv;
> + struct dw_mci *host;
> +
> + host = slot->host;
> + priv = host->priv;
> +
> + if (!priv || !priv->reg)
> + return 0;
> +
> + if (priv->ctrl_id == DWMMC_SDIO_ID)
> + return 0;
> +
> + if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
> + ret = dw_mci_set_sel18(host, 0);
> + if (ret)
> + return ret;
> + min_uv = 2950000;
> + max_uv = 2950000;
> + } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
> + ret = dw_mci_set_sel18(host, 1);
> + if (ret)
> + return ret;
> + min_uv = 1800000;
> + max_uv = 1800000;
> + }
> +
> + if (IS_ERR_OR_NULL(mmc->supply.vqmmc))
> + return 0;
> +
> + ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
> + if (ret) {
> + dev_err(host->dev, "Regulator set error %d: %d - %d\n",
> + ret, min_uv, max_uv);
> + return ret;
> + }
> + return 0;
> +}
> +
> +static const struct dw_mci_drv_data hi3660_data = {
> + .init = dw_mci_hi3660_init,
> + .set_ios = dw_mci_hi3660_set_ios,
> + .parse_dt = dw_mci_hi6220_parse_dt,
> + .execute_tuning = dw_mci_hi3660_execute_tuning,
> + .switch_voltage = dw_mci_hi3660_switch_voltage,
> +};
> +
> static const struct of_device_id dw_mci_k3_match[] = {
> + { .compatible = "hisilicon,hi3660-dw-mshc", .data = &hi3660_data, },
> { .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, },
> { .compatible = "hisilicon,hi6220-dw-mshc", .data = &hi6220_data, },
> {},
> @@ -155,6 +463,11 @@ static int dw_mci_k3_probe(struct platform_device *pdev)
> {
> const struct dw_mci_drv_data *drv_data;
> const struct of_device_id *match;
> + struct reset_control *rst;
> +
> + rst = devm_reset_control_get(&pdev->dev, NULL);
> + if (!IS_ERR(rst))
> + reset_control_reset(rst);
>
> match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
> drv_data = match->data;
> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
> index ce347361f3dc..7cdcafda8eec 100644
> --- a/drivers/mmc/host/dw_mmc.h
> +++ b/drivers/mmc/host/dw_mmc.h
> @@ -319,6 +319,8 @@ struct dw_mci_board {
> #define SDMMC_DSCADDR 0x094
> #define SDMMC_BUFADDR 0x098
> #define SDMMC_CDTHRCTL 0x100
> +#define SDMMC_UHS_REG_EXT 0x108
> +#define SDMMC_ENABLE_SHIFT 0x110
> #define SDMMC_DATA(x) (x)
> /*
> * Registers to support idmac 64-bit address mode
> --
> 2.11.0
>

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