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/pm_runtime.h>
  19 #include <linux/regmap.h>
  20 #include <linux/regulator/consumer.h>
  21
  22 #include "dw_mmc.h"
  23 #include "dw_mmc-pltfm.h"
  24
  25 /*
  26  * hi6220 sd only support io voltage 1.8v and 3v
  27  * Also need config AO_SCTRL_SEL18 accordingly
  28  */
  29 #define AO_SCTRL_SEL18          BIT(10)
  30 #define AO_SCTRL_CTRL3          0x40C
  31
  32 struct k3_priv {
  33         struct regmap   *reg;
  34 };
  35
  36 static unsigned long dw_mci_hi6220_caps[] = {
  37         MMC_CAP_CMD23,
  38         MMC_CAP_CMD23,
  39         0
  40 };
  41
  42 static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios)
  43 {
  44         int ret;
  45
  46         ret = clk_set_rate(host->ciu_clk, ios->clock);
  47         if (ret)
  48                 dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
  49
  50         host->bus_hz = clk_get_rate(host->ciu_clk);
  51 }
  52
  53 static const struct dw_mci_drv_data k3_drv_data = {
  54         .set_ios                = dw_mci_k3_set_ios,
  55 };
  56
  57 static int dw_mci_hi6220_parse_dt(struct dw_mci *host)
  58 {
  59         struct k3_priv *priv;
  60
  61         priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
  62         if (!priv)
  63                 return -ENOMEM;
  64
  65         priv->reg = syscon_regmap_lookup_by_phandle(host->dev->of_node,
  66                                          "hisilicon,peripheral-syscon");
  67         if (IS_ERR(priv->reg))
  68                 priv->reg = NULL;
  69
  70         host->priv = priv;
  71         return 0;
  72 }
  73
  74 static int dw_mci_hi6220_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
  75 {
  76         struct dw_mci_slot *slot = mmc_priv(mmc);
  77         struct k3_priv *priv;
  78         struct dw_mci *host;
  79         int min_uv, max_uv;
  80         int ret;
  81
  82         host = slot->host;
  83         priv = host->priv;
  84
  85         if (!priv || !priv->reg)
  86                 return 0;
  87
  88         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
  89                 ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
  90                                          AO_SCTRL_SEL18, 0);
  91                 min_uv = 3000000;
  92                 max_uv = 3000000;
  93         } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
  94                 ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
  95                                          AO_SCTRL_SEL18, AO_SCTRL_SEL18);
  96                 min_uv = 1800000;
  97                 max_uv = 1800000;
  98         } else {
  99                 dev_dbg(host->dev, "voltage not supported\n");
 100                 return -EINVAL;
 101         }
 102
 103         if (ret) {
 104                 dev_dbg(host->dev, "switch voltage failed\n");
 105                 return ret;
 106         }
 107
 108         if (IS_ERR_OR_NULL(mmc->supply.vqmmc))
 109                 return 0;
 110
 111         ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
 112         if (ret) {
 113                 dev_dbg(host->dev, "Regulator set error %d: %d - %d\n",
 114                                  ret, min_uv, max_uv);
 115                 return ret;
 116         }
 117
 118         return 0;
 119 }
 120
 121 static void dw_mci_hi6220_set_ios(struct dw_mci *host, struct mmc_ios *ios)
 122 {
 123         int ret;
 124         unsigned int clock;
 125
 126         clock = (ios->clock <= 25000000) ? 25000000 : ios->clock;
 127
 128         ret = clk_set_rate(host->biu_clk, clock);
 129         if (ret)
 130                 dev_warn(host->dev, "failed to set rate %uHz\n", clock);
 131
 132         host->bus_hz = clk_get_rate(host->biu_clk);
 133 }
 134
 135 static int dw_mci_hi6220_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
 136 {
 137         return 0;
 138 }
 139
 140 static const struct dw_mci_drv_data hi6220_data = {
 141         .caps                   = dw_mci_hi6220_caps,
 142         .switch_voltage         = dw_mci_hi6220_switch_voltage,
 143         .set_ios                = dw_mci_hi6220_set_ios,
 144         .parse_dt               = dw_mci_hi6220_parse_dt,
 145         .execute_tuning         = dw_mci_hi6220_execute_tuning,
 146 };
 147
 148 static const struct of_device_id dw_mci_k3_match[] = {
 149         { .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, },
 150         { .compatible = "hisilicon,hi6220-dw-mshc", .data = &hi6220_data, },
 151         {},
 152 };
 153 MODULE_DEVICE_TABLE(of, dw_mci_k3_match);
 154
 155 static int dw_mci_k3_probe(struct platform_device *pdev)
 156 {
 157         const struct dw_mci_drv_data *drv_data;
 158         const struct of_device_id *match;
 159
 160         match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
 161         drv_data = match->data;
 162
 163         return dw_mci_pltfm_register(pdev, drv_data);
 164 }
 165
 166 static const struct dev_pm_ops dw_mci_k3_dev_pm_ops = {
 167         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 168                                 pm_runtime_force_resume)
 169         SET_RUNTIME_PM_OPS(dw_mci_runtime_suspend,
 170                            dw_mci_runtime_resume,
 171                            NULL)
 172 };
 173
 174 static struct platform_driver dw_mci_k3_pltfm_driver = {
 175         .probe          = dw_mci_k3_probe,
 176         .remove         = dw_mci_pltfm_remove,
 177         .driver         = {
 178                 .name           = "dwmmc_k3",
 179                 .of_match_table = dw_mci_k3_match,
 180                 .pm             = &dw_mci_k3_dev_pm_ops,
 181         },
 182 };
 183
 184 module_platform_driver(dw_mci_k3_pltfm_driver);
 185
 186 MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension");
 187 MODULE_LICENSE("GPL v2");
 188 MODULE_ALIAS("platform:dwmmc_k3");