drivers/mmc/host/dw_mmc-hi3798cv200.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2018 HiSilicon Technologies Co., Ltd.
   4  */
   5
   6 #include <linux/clk.h>
   7 #include <linux/mfd/syscon.h>
   8 #include <linux/mmc/host.h>
   9 #include <linux/module.h>
  10 #include <linux/of_address.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/pm_runtime.h>
  13 #include <linux/regmap.h>
  14 #include <linux/regulator/consumer.h>
  15
  16 #include "dw_mmc.h"
  17 #include "dw_mmc-pltfm.h"
  18
  19 #define ALL_INT_CLR             0x1ffff
  20
  21 struct hi3798cv200_priv {
  22         struct clk *sample_clk;
  23         struct clk *drive_clk;
  24 };
  25
  26 static unsigned long dw_mci_hi3798cv200_caps[] = {
  27         MMC_CAP_CMD23,
  28         MMC_CAP_CMD23,
  29         MMC_CAP_CMD23
  30 };
  31
  32 static void dw_mci_hi3798cv200_set_ios(struct dw_mci *host, struct mmc_ios *ios)
  33 {
  34         struct hi3798cv200_priv *priv = host->priv;
  35         u32 val;
  36
  37         val = mci_readl(host, UHS_REG);
  38         if (ios->timing == MMC_TIMING_MMC_DDR52 ||
  39             ios->timing == MMC_TIMING_UHS_DDR50)
  40                 val |= SDMMC_UHS_DDR;
  41         else
  42                 val &= ~SDMMC_UHS_DDR;
  43         mci_writel(host, UHS_REG, val);
  44
  45         val = mci_readl(host, ENABLE_SHIFT);
  46         if (ios->timing == MMC_TIMING_MMC_DDR52)
  47                 val |= SDMMC_ENABLE_PHASE;
  48         else
  49                 val &= ~SDMMC_ENABLE_PHASE;
  50         mci_writel(host, ENABLE_SHIFT, val);
  51
  52         val = mci_readl(host, DDR_REG);
  53         if (ios->timing == MMC_TIMING_MMC_HS400)
  54                 val |= SDMMC_DDR_HS400;
  55         else
  56                 val &= ~SDMMC_DDR_HS400;
  57         mci_writel(host, DDR_REG, val);
  58
  59         if (ios->timing == MMC_TIMING_MMC_HS ||
  60             ios->timing == MMC_TIMING_LEGACY)
  61                 clk_set_phase(priv->drive_clk, 180);
  62         else if (ios->timing == MMC_TIMING_MMC_HS200)
  63                 clk_set_phase(priv->drive_clk, 135);
  64 }
  65
  66 static int dw_mci_hi3798cv200_execute_tuning(struct dw_mci_slot *slot,
  67                                              u32 opcode)
  68 {
  69         static const int degrees[] = { 0, 45, 90, 135, 180, 225, 270, 315 };
  70         struct dw_mci *host = slot->host;
  71         struct hi3798cv200_priv *priv = host->priv;
  72         int raise_point = -1, fall_point = -1;
  73         int err, prev_err = -1;
  74         int found = 0;
  75         int i;
  76
  77         for (i = 0; i < ARRAY_SIZE(degrees); i++) {
  78                 clk_set_phase(priv->sample_clk, degrees[i]);
  79                 mci_writel(host, RINTSTS, ALL_INT_CLR);
  80
  81                 err = mmc_send_tuning(slot->mmc, opcode, NULL);
  82                 if (!err)
  83                         found = 1;
  84
  85                 if (i > 0) {
  86                         if (err && !prev_err)
  87                                 fall_point = i - 1;
  88                         if (!err && prev_err)
  89                                 raise_point = i;
  90                 }
  91
  92                 if (raise_point != -1 && fall_point != -1)
  93                         goto tuning_out;
  94
  95                 prev_err = err;
  96                 err = 0;
  97         }
  98
  99 tuning_out:
 100         if (found) {
 101                 if (raise_point == -1)
 102                         raise_point = 0;
 103                 if (fall_point == -1)
 104                         fall_point = ARRAY_SIZE(degrees) - 1;
 105                 if (fall_point < raise_point) {
 106                         if ((raise_point + fall_point) >
 107                             (ARRAY_SIZE(degrees) - 1))
 108                                 i = fall_point / 2;
 109                         else
 110                                 i = (raise_point + ARRAY_SIZE(degrees) - 1) / 2;
 111                 } else {
 112                         i = (raise_point + fall_point) / 2;
 113                 }
 114
 115                 clk_set_phase(priv->sample_clk, degrees[i]);
 116                 dev_dbg(host->dev, "Tuning clk_sample[%d, %d], set[%d]\n",
 117                         raise_point, fall_point, degrees[i]);
 118         } else {
 119                 dev_err(host->dev, "No valid clk_sample shift! use default\n");
 120                 err = -EINVAL;
 121         }
 122
 123         mci_writel(host, RINTSTS, ALL_INT_CLR);
 124         return err;
 125 }
 126
 127 static int dw_mci_hi3798cv200_init(struct dw_mci *host)
 128 {
 129         struct hi3798cv200_priv *priv;
 130         int ret;
 131
 132         priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
 133         if (!priv)
 134                 return -ENOMEM;
 135
 136         priv->sample_clk = devm_clk_get(host->dev, "ciu-sample");
 137         if (IS_ERR(priv->sample_clk)) {
 138                 dev_err(host->dev, "failed to get ciu-sample clock\n");
 139                 return PTR_ERR(priv->sample_clk);
 140         }
 141
 142         priv->drive_clk = devm_clk_get(host->dev, "ciu-drive");
 143         if (IS_ERR(priv->drive_clk)) {
 144                 dev_err(host->dev, "failed to get ciu-drive clock\n");
 145                 return PTR_ERR(priv->drive_clk);
 146         }
 147
 148         ret = clk_prepare_enable(priv->sample_clk);
 149         if (ret) {
 150                 dev_err(host->dev, "failed to enable ciu-sample clock\n");
 151                 return ret;
 152         }
 153
 154         ret = clk_prepare_enable(priv->drive_clk);
 155         if (ret) {
 156                 dev_err(host->dev, "failed to enable ciu-drive clock\n");
 157                 goto disable_sample_clk;
 158         }
 159
 160         host->priv = priv;
 161         return 0;
 162
 163 disable_sample_clk:
 164         clk_disable_unprepare(priv->sample_clk);
 165         return ret;
 166 }
 167
 168 static const struct dw_mci_drv_data hi3798cv200_data = {
 169         .caps = dw_mci_hi3798cv200_caps,
 170         .num_caps = ARRAY_SIZE(dw_mci_hi3798cv200_caps),
 171         .init = dw_mci_hi3798cv200_init,
 172         .set_ios = dw_mci_hi3798cv200_set_ios,
 173         .execute_tuning = dw_mci_hi3798cv200_execute_tuning,
 174 };
 175
 176 static int dw_mci_hi3798cv200_probe(struct platform_device *pdev)
 177 {
 178         return dw_mci_pltfm_register(pdev, &hi3798cv200_data);
 179 }
 180
 181 static int dw_mci_hi3798cv200_remove(struct platform_device *pdev)
 182 {
 183         struct dw_mci *host = platform_get_drvdata(pdev);
 184         struct hi3798cv200_priv *priv = host->priv;
 185
 186         clk_disable_unprepare(priv->drive_clk);
 187         clk_disable_unprepare(priv->sample_clk);
 188
 189         return dw_mci_pltfm_remove(pdev);
 190 }
 191
 192 static const struct of_device_id dw_mci_hi3798cv200_match[] = {
 193         { .compatible = "hisilicon,hi3798cv200-dw-mshc", },
 194         {},
 195 };
 196
 197 MODULE_DEVICE_TABLE(of, dw_mci_hi3798cv200_match);
 198 static struct platform_driver dw_mci_hi3798cv200_driver = {
 199         .probe = dw_mci_hi3798cv200_probe,
 200         .remove = dw_mci_hi3798cv200_remove,
 201         .driver = {
 202                 .name = "dwmmc_hi3798cv200",
 203                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 204                 .of_match_table = dw_mci_hi3798cv200_match,
 205         },
 206 };
 207 module_platform_driver(dw_mci_hi3798cv200_driver);
 208
 209 MODULE_DESCRIPTION("HiSilicon Hi3798CV200 Specific DW-MSHC Driver Extension");
 210 MODULE_LICENSE("GPL v2");
 211 MODULE_ALIAS("platform:dwmmc_hi3798cv200");