drivers/mmc/host/dw_mmc-k3.c

   1 /*
   2  * Copyright (c) 2013 Linaro Ltd.
   3  * Copyright (c) 2013 Hisilicon Limited.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/clk.h>
  12 #include <linux/mfd/syscon.h>
  13 #include <linux/mmc/host.h>
  14 #include <linux/mmc/dw_mmc.h>
  15 #include <linux/module.h>
  16 #include <linux/of_address.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19 #include <linux/regulator/consumer.h>
  20
  21 #include "dw_mmc.h"
  22 #include "dw_mmc-pltfm.h"
  23
  24 /*
  25  * hi6220 sd only support io voltage 1.8v and 3v
  26  * Also need config AO_SCTRL_SEL18 accordingly
  27  */
  28 #define AO_SCTRL_SEL18          BIT(10)
  29 #define AO_SCTRL_CTRL3          0x40C
  30
  31 struct k3_priv {
  32         struct regmap   *reg;
  33 };
  34
  35 static unsigned long dw_mci_hi6220_caps[] = {
  36         MMC_CAP_CMD23,
  37         MMC_CAP_CMD23,
  38         0
  39 };
  40
  41 static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios)
  42 {
  43         int ret;
  44
  45         ret = clk_set_rate(host->ciu_clk, ios->clock);
  46         if (ret)
  47                 dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
  48
  49         host->bus_hz = clk_get_rate(host->ciu_clk);
  50 }
  51
  52 static const struct dw_mci_drv_data k3_drv_data = {
  53         .set_ios                = dw_mci_k3_set_ios,
  54 };
  55
  56 static int dw_mci_hi6220_parse_dt(struct dw_mci *host)
  57 {
  58         struct k3_priv *priv;
  59
  60         priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
  61         if (!priv)
  62                 return -ENOMEM;
  63
  64         priv->reg = syscon_regmap_lookup_by_phandle(host->dev->of_node,
  65                                          "hisilicon,peripheral-syscon");
  66         if (IS_ERR(priv->reg))
  67                 priv->reg = NULL;
  68
  69         host->priv = priv;
  70         return 0;
  71 }
  72
  73 static int dw_mci_hi6220_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
  74 {
  75         struct dw_mci_slot *slot = mmc_priv(mmc);
  76         struct k3_priv *priv;
  77         struct dw_mci *host;
  78         int min_uv, max_uv;
  79         int ret;
  80
  81         host = slot->host;
  82         priv = host->priv;
  83
  84         if (!priv || !priv->reg)
  85                 return 0;
  86
  87         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
  88                 ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
  89                                          AO_SCTRL_SEL18, 0);
  90                 min_uv = 3000000;
  91                 max_uv = 3000000;
  92         } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
  93                 ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
  94                                          AO_SCTRL_SEL18, AO_SCTRL_SEL18);
  95                 min_uv = 1800000;
  96                 max_uv = 1800000;
  97         } else {
  98                 dev_dbg(host->dev, "voltage not supported\n");
  99                 return -EINVAL;
 100         }
 101
 102         if (ret) {
 103                 dev_dbg(host->dev, "switch voltage failed\n");
 104                 return ret;
 105         }
 106
 107         if (IS_ERR_OR_NULL(mmc->supply.vqmmc))
 108                 return 0;
 109
 110         ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
 111         if (ret) {
 112                 dev_dbg(host->dev, "Regulator set error %d: %d - %d\n",
 113                                  ret, min_uv, max_uv);
 114                 return ret;
 115         }
 116
 117         return 0;
 118 }
 119
 120 static void dw_mci_hi6220_set_ios(struct dw_mci *host, struct mmc_ios *ios)
 121 {
 122         int ret;
 123         unsigned int clock;
 124
 125         clock = (ios->clock <= 25000000) ? 25000000 : ios->clock;
 126
 127         ret = clk_set_rate(host->biu_clk, clock);
 128         if (ret)
 129                 dev_warn(host->dev, "failed to set rate %uHz\n", clock);
 130
 131         host->bus_hz = clk_get_rate(host->biu_clk);
 132 }
 133
 134 static int dw_mci_hi6220_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
 135 {
 136         return 0;
 137 }
 138
 139 static const struct dw_mci_drv_data hi6220_data = {
 140         .caps                   = dw_mci_hi6220_caps,
 141         .switch_voltage         = dw_mci_hi6220_switch_voltage,
 142         .set_ios                = dw_mci_hi6220_set_ios,
 143         .parse_dt               = dw_mci_hi6220_parse_dt,
 144         .execute_tuning         = dw_mci_hi6220_execute_tuning,
 145 };
 146
 147 static const struct of_device_id dw_mci_k3_match[] = {
 148         { .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, },
 149         { .compatible = "hisilicon,hi6220-dw-mshc", .data = &hi6220_data, },
 150         {},
 151 };
 152 MODULE_DEVICE_TABLE(of, dw_mci_k3_match);
 153
 154 static int dw_mci_k3_probe(struct platform_device *pdev)
 155 {
 156         const struct dw_mci_drv_data *drv_data;
 157         const struct of_device_id *match;
 158
 159         match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
 160         drv_data = match->data;
 161
 162         return dw_mci_pltfm_register(pdev, drv_data);
 163 }
 164
 165 #ifdef CONFIG_PM_SLEEP
 166 static int dw_mci_k3_suspend(struct device *dev)
 167 {
 168         struct dw_mci *host = dev_get_drvdata(dev);
 169         int ret;
 170
 171         ret = dw_mci_suspend(host);
 172         if (!ret)
 173                 clk_disable_unprepare(host->ciu_clk);
 174
 175         return ret;
 176 }
 177
 178 static int dw_mci_k3_resume(struct device *dev)
 179 {
 180         struct dw_mci *host = dev_get_drvdata(dev);
 181         int ret;
 182
 183         ret = clk_prepare_enable(host->ciu_clk);
 184         if (ret) {
 185                 dev_err(host->dev, "failed to enable ciu clock\n");
 186                 return ret;
 187         }
 188
 189         return dw_mci_resume(host);
 190 }
 191 #endif /* CONFIG_PM_SLEEP */
 192
 193 static SIMPLE_DEV_PM_OPS(dw_mci_k3_pmops, dw_mci_k3_suspend, dw_mci_k3_resume);
 194
 195 static struct platform_driver dw_mci_k3_pltfm_driver = {
 196         .probe          = dw_mci_k3_probe,
 197         .remove         = dw_mci_pltfm_remove,
 198         .driver         = {
 199                 .name           = "dwmmc_k3",
 200                 .of_match_table = dw_mci_k3_match,
 201                 .pm             = &dw_mci_k3_pmops,
 202         },
 203 };
 204
 205 module_platform_driver(dw_mci_k3_pltfm_driver);
 206
 207 MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension");
 208 MODULE_LICENSE("GPL v2");
 209 MODULE_ALIAS("platform:dwmmc_k3");