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Date: Tue, 16 May 2017 23:52:07 +0200
From: Heiner Kallweit <hkallweit1@...il.com>
To: liwei <liwei213@...wei.com>, ulf.hansson@...aro.org,
adrian.hunter@...el.com, jh80.chung@...sung.com,
shawn.lin@...k-chips.com, wsa+renesas@...g-engineering.com,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: guodong.xu@...aro.org
Subject: Re: [PATCH] mmc:dw_mmc-k3: add sd support for hi3660
Am 16.05.2017 um 14:26 schrieb liwei:
> Add sd card support for hi3660 soc
>
> Signed-off-by: Li Wei <liwei213@...wei.com>
> Signed-off-by: Chen Jun <chenjun14@...wei.com>
> ---
> drivers/mmc/host/dw_mmc-k3.c | 311 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 311 insertions(+)
>
> diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
> index e38fb0020bb1..59d6e0870fb1 100644
> --- a/drivers/mmc/host/dw_mmc-k3.c
> +++ b/drivers/mmc/host/dw_mmc-k3.c
> @@ -8,6 +8,7 @@
> * (at your option) any later version.
> */
>
> +#include <linux/bitops.h>
> #include <linux/clk.h>
> #include <linux/mfd/syscon.h>
> #include <linux/mmc/host.h>
> @@ -28,7 +29,44 @@
> #define AO_SCTRL_SEL18 BIT(10)
> #define AO_SCTRL_CTRL3 0x40C
>
> +#define DWMMC_SD_ID 1
> +#define DWMMC_SDIO_ID 2
> +
> +#define SOC_SCTRL_SCPERCTRL5 (0x314)
> +#define SDCARD_IO_SEL18 BIT(2)
> +
> +#define GENCLK_DIV (7)
> +
> +#define GPIO_CLK_ENABLE BIT(16)
> +#define GPIO_CLK_DIV(x) (((x) & 0xf) << 8)
> +#define GPIO_USE_SAMPLE_DLY(x) (((x) & 0x1) << 13)
> +#define UHS_REG_EXT_SAMPLE_PHASE(x) (((x) & 0x1f) << 16)
> +#define UHS_REG_EXT_SAMPLE_DLY(x) (((x) & 0x1f) << 26)
> +#define UHS_REG_EXT_SAMPLE_DRVPHASE(x) (((x) & 0x1f) << 21)
Using the GENMASK and FIELD_PREP macros may be a good alternative here,
e.g.:
#define GPIO_CLK_DIV_MASK GENMASK(11, 8)
Then in the code use FIELD_PREP(GPIO_CLK_DIV_MASK, x)
And the bit field definitions should follow the register defines, e.g.:
#define REG_1 0x00
#define REG_1_FIELD_1 GENMASK(a, b)
#define REG_1_FIELD_2 GENMASK(c, d)
This makes it easier for people checking the code against the chip spec.
> +#define SDMMC_UHS_REG_EXT_VALUE(x, y, z) (UHS_REG_EXT_SAMPLE_PHASE(x) |\
> + UHS_REG_EXT_SAMPLE_DLY(y) |\
> + UHS_REG_EXT_SAMPLE_DRVPHASE(z))
> +#define SDMMC_GPIO_VALUE(x, y) (GPIO_CLK_DIV(x) | GPIO_USE_SAMPLE_DLY(y))
Both macros are used only once. So are they actually needed?
> +
> +#define SDMMC_UHS_REG_EXT 0x108
> +#define SDMMC_ENABLE_SHIFT 0x110
> +
> +#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 {
> + u8 ctrl_id;
> + u32 cur_speed;
> struct regmap *reg;
> };
>
> @@ -38,6 +76,41 @@ static unsigned long dw_mci_hi6220_caps[] = {
> 0
> };
>
> +struct hs_timing {
> + int drv_phase;
> + int sam_dly;
> + int sam_phase_max;
> + int sam_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 +139,10 @@ 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 +221,236 @@ 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 sam_phase)
> +{
> + int drv_phase;
> + int sam_dly;
> + int ctrl_id;
> + int use_sam_dly = 0;
> + int enable_shift = 0;
> + int reg_value;
> + struct k3_priv *priv;
> +
> + priv = host->priv;
> + ctrl_id = priv->ctrl_id;
> +
> + drv_phase = hs_timing_cfg[ctrl_id][timing].drv_phase;
> + sam_dly = hs_timing_cfg[ctrl_id][timing].sam_dly;
> + if (sam_phase == -1)
> + sam_phase = (hs_timing_cfg[ctrl_id][timing].sam_phase_max +
> + hs_timing_cfg[ctrl_id][timing].sam_phase_min) / 2;
> +
> + if (timing == MMC_TIMING_UHS_SDR50 ||
> + timing == MMC_TIMING_UHS_SDR104) {
> + if (sam_phase >= ENABLE_SHIFT_MIN_SMPL &&
> + sam_phase <= ENABLE_SHIFT_MAX_SMPL)
> + enable_shift = 1;
> + }
> + if (timing == MMC_TIMING_UHS_SDR104) {
> + if (sam_phase >= USE_DLY_MIN_SMPL &&
> + sam_phase <= USE_DLY_MAX_SMPL)
> + use_sam_dly = 1;
> + }
> +
> + mci_writel(host, GPIO, 0x0);
> + udelay(5);
> +
> + reg_value = SDMMC_UHS_REG_EXT_VALUE(sam_phase, sam_dly, drv_phase);
> + mci_writel(host, UHS_REG_EXT, reg_value);
> +
> + mci_writel(host, ENABLE_SHIFT, enable_shift);
> +
> + reg_value = SDMMC_GPIO_VALUE(GENCLK_DIV, use_sam_dly);
> + mci_writel(host, GPIO, (unsigned int)reg_value | GPIO_CLK_ENABLE);
> +
> + /* We should delay 1ms wait for timing setting finished. */
> + mdelay(1);
See Documentation/timers/timers-howto.txt, better use usleep_range here.
> +}
> +
> +int dw_mci_hi3660_init(struct dw_mci *host)
> +{
> + /* set threshold to 512 bytes */
> + mci_writel(host, CDTHRCTL, 0x02000001);
> +
> + 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;
> +
> + while (i < 32) {
> + v = ror32(sample_flag, i);
> + len = ffs(~v) - 1;
IMO it would be worth adding a comment explaining this magic.
> +
> + 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 sam_phase = 0;
> + u32 tuning_sample_flag = 0;
> + int best_clksmpl = 0;
> +
> + for (i = 0; i < NUM_PHASES; ++i, ++sam_phase) {
> + sam_phase %= 32;
> +
> + mci_writel(host, TMOUT, ~0);
> + dw_mci_hs_set_timing(host, mmc->ios.timing, sam_phase);
> +
> + if (!mmc_send_tuning(mmc, opcode, NULL))
> + tuning_sample_flag |= (1 << sam_phase);
> + else
> + tuning_sample_flag &= ~(1 << sam_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_dbg(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 +461,11 @@ 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;
>
Small disclaimer: The remarks are based on my experience when submitting patches.
The actual maintainers opinion might differ.
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