kernel/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 void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios)
  36 {
  37         int ret;
  38
  39         ret = clk_set_rate(host->ciu_clk, ios->clock);
  40         if (ret)
  41                 dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
  42
  43         host->bus_hz = clk_get_rate(host->ciu_clk);
  44 }
  45
  46 static const struct dw_mci_drv_data k3_drv_data = {
  47         .set_ios                = dw_mci_k3_set_ios,
  48 };
  49
  50 static int dw_mci_hi6220_parse_dt(struct dw_mci *host)
  51 {
  52         struct k3_priv *priv;
  53
  54         priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
  55         if (!priv)
  56                 return -ENOMEM;
  57
  58         priv->reg = syscon_regmap_lookup_by_phandle(host->dev->of_node,
  59                                          "hisilicon,peripheral-syscon");
  60         if (IS_ERR(priv->reg))
  61                 priv->reg = NULL;
  62
  63         host->priv = priv;
  64         return 0;
  65 }
  66
  67 static int dw_mci_hi6220_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
  68 {
  69         struct dw_mci_slot *slot = mmc_priv(mmc);
  70         struct k3_priv *priv;
  71         struct dw_mci *host;
  72         int min_uv, max_uv;
  73         int ret;
  74
  75         host = slot->host;
  76         priv = host->priv;
  77
  78         if (!priv || !priv->reg)
  79                 return 0;
  80
  81         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
  82                 ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
  83                                          AO_SCTRL_SEL18, 0);
  84                 min_uv = 3000000;
  85                 max_uv = 3000000;
  86         } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
  87                 ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
  88                                          AO_SCTRL_SEL18, AO_SCTRL_SEL18);
  89                 min_uv = 1800000;
  90                 max_uv = 1800000;
  91         } else {
  92                 dev_dbg(host->dev, "voltage not supported\n");
  93                 return -EINVAL;
  94         }
  95
  96         if (ret) {
  97                 dev_dbg(host->dev, "switch voltage failed\n");
  98                 return ret;
  99         }
 100
 101         if (IS_ERR_OR_NULL(mmc->supply.vqmmc))
 102                 return 0;
 103
 104         ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
 105         if (ret) {
 106                 dev_dbg(host->dev, "Regulator set error %d: %d - %d\n",
 107                                  ret, min_uv, max_uv);
 108                 return ret;
 109         }
 110
 111         return 0;
 112 }
 113
 114 static void dw_mci_hi6220_set_ios(struct dw_mci *host, struct mmc_ios *ios)
 115 {
 116         int ret;
 117         unsigned int clock;
 118
 119         clock = (ios->clock <= 25000000) ? 25000000 : ios->clock;
 120
 121         ret = clk_set_rate(host->biu_clk, clock);
 122         if (ret)
 123                 dev_warn(host->dev, "failed to set rate %uHz\n", clock);
 124
 125         host->bus_hz = clk_get_rate(host->biu_clk);
 126 }
 127
 128 static const struct dw_mci_drv_data hi6220_data = {
 129         .switch_voltage         = dw_mci_hi6220_switch_voltage,
 130         .set_ios                = dw_mci_hi6220_set_ios,
 131         .parse_dt               = dw_mci_hi6220_parse_dt,
 132 };
 133
 134 static const struct of_device_id dw_mci_k3_match[] = {
 135         { .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, },
 136         { .compatible = "hisilicon,hi6220-dw-mshc", .data = &hi6220_data, },
 137         {},
 138 };
 139 MODULE_DEVICE_TABLE(of, dw_mci_k3_match);
 140
 141 static int dw_mci_k3_probe(struct platform_device *pdev)
 142 {
 143         const struct dw_mci_drv_data *drv_data;
 144         const struct of_device_id *match;
 145
 146         match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
 147         drv_data = match->data;
 148
 149         return dw_mci_pltfm_register(pdev, drv_data);
 150 }
 151
 152 #ifdef CONFIG_PM_SLEEP
 153 static int dw_mci_k3_suspend(struct device *dev)
 154 {
 155         struct dw_mci *host = dev_get_drvdata(dev);
 156         int ret;
 157
 158         ret = dw_mci_suspend(host);
 159         if (!ret)
 160                 clk_disable_unprepare(host->ciu_clk);
 161
 162         return ret;
 163 }
 164
 165 static int dw_mci_k3_resume(struct device *dev)
 166 {
 167         struct dw_mci *host = dev_get_drvdata(dev);
 168         int ret;
 169
 170         ret = clk_prepare_enable(host->ciu_clk);
 171         if (ret) {
 172                 dev_err(host->dev, "failed to enable ciu clock\n");
 173                 return ret;
 174         }
 175
 176         return dw_mci_resume(host);
 177 }
 178 #endif /* CONFIG_PM_SLEEP */
 179
 180 static SIMPLE_DEV_PM_OPS(dw_mci_k3_pmops, dw_mci_k3_suspend, dw_mci_k3_resume);
 181
 182 static struct platform_driver dw_mci_k3_pltfm_driver = {
 183         .probe          = dw_mci_k3_probe,
 184         .remove         = dw_mci_pltfm_remove,
 185         .driver         = {
 186                 .name           = "dwmmc_k3",
 187                 .of_match_table = dw_mci_k3_match,
 188                 .pm             = &dw_mci_k3_pmops,
 189         },
 190 };
 191
 192 module_platform_driver(dw_mci_k3_pltfm_driver);
 193
 194 MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension");
 195 MODULE_LICENSE("GPL v2");
 196 MODULE_ALIAS("platform:dwmmc_k3");