drivers/mmc/host/sdhci_f_sdh30.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/drivers/mmc/host/sdhci_f_sdh30.c
   4  *
   5  * Copyright (C) 2013 - 2015 Fujitsu Semiconductor, Ltd
   6  *              Vincent Yang <vincent.yang@tw.fujitsu.com>
   7  * Copyright (C) 2015 Linaro Ltd  Andy Green <andy.green@linaro.org>
   8  */
   9
  10 #include <linux/acpi.h>
  11 #include <linux/err.h>
  12 #include <linux/delay.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/property.h>
  16 #include <linux/clk.h>
  17
  18 #include "sdhci-pltfm.h"
  19 #include "sdhci_f_sdh30.h"
  20
  21 struct f_sdhost_priv {
  22         struct clk *clk_iface;
  23         struct clk *clk;
  24         u32 vendor_hs200;
  25         struct device *dev;
  26         bool enable_cmd_dat_delay;
  27 };
  28
  29 static void *sdhci_f_sdhost_priv(struct sdhci_host *host)
  30 {
  31         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  32
  33         return sdhci_pltfm_priv(pltfm_host);
  34 }
  35
  36 static void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host)
  37 {
  38         struct f_sdhost_priv *priv = sdhci_f_sdhost_priv(host);
  39         u32 ctrl = 0;
  40
  41         usleep_range(2500, 3000);
  42         ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2);
  43         ctrl |= F_SDH30_CRES_O_DN;
  44         sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
  45         ctrl |= F_SDH30_MSEL_O_1_8;
  46         sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
  47
  48         ctrl &= ~F_SDH30_CRES_O_DN;
  49         sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
  50         usleep_range(2500, 3000);
  51
  52         if (priv->vendor_hs200) {
  53                 dev_info(priv->dev, "%s: setting hs200\n", __func__);
  54                 ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
  55                 ctrl |= priv->vendor_hs200;
  56                 sdhci_writel(host, ctrl, F_SDH30_ESD_CONTROL);
  57         }
  58
  59         ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING);
  60         ctrl |= F_SDH30_CMD_CHK_DIS;
  61         sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING);
  62 }
  63
  64 static unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host)
  65 {
  66         return F_SDH30_MIN_CLOCK;
  67 }
  68
  69 static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask)
  70 {
  71         struct f_sdhost_priv *priv = sdhci_f_sdhost_priv(host);
  72         u32 ctl;
  73
  74         if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0)
  75                 sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL);
  76
  77         sdhci_reset(host, mask);
  78
  79         if (priv->enable_cmd_dat_delay) {
  80                 ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
  81                 ctl |= F_SDH30_CMD_DAT_DELAY;
  82                 sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL);
  83         }
  84 }
  85
  86 static const struct sdhci_ops sdhci_f_sdh30_ops = {
  87         .voltage_switch = sdhci_f_sdh30_soft_voltage_switch,
  88         .get_min_clock = sdhci_f_sdh30_get_min_clock,
  89         .reset = sdhci_f_sdh30_reset,
  90         .set_clock = sdhci_set_clock,
  91         .set_bus_width = sdhci_set_bus_width,
  92         .set_uhs_signaling = sdhci_set_uhs_signaling,
  93 };
  94
  95 static const struct sdhci_pltfm_data sdhci_f_sdh30_pltfm_data = {
  96         .ops = &sdhci_f_sdh30_ops,
  97         .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
  98                 | SDHCI_QUIRK_INVERTED_WRITE_PROTECT,
  99         .quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE
 100                 |  SDHCI_QUIRK2_TUNING_WORK_AROUND,
 101 };
 102
 103 static int sdhci_f_sdh30_probe(struct platform_device *pdev)
 104 {
 105         struct sdhci_host *host;
 106         struct device *dev = &pdev->dev;
 107         int ctrl = 0, ret = 0;
 108         struct f_sdhost_priv *priv;
 109         struct sdhci_pltfm_host *pltfm_host;
 110         u32 reg = 0;
 111
 112         host = sdhci_pltfm_init(pdev, &sdhci_f_sdh30_pltfm_data,
 113                                 sizeof(struct f_sdhost_priv));
 114         if (IS_ERR(host))
 115                 return PTR_ERR(host);
 116
 117         pltfm_host = sdhci_priv(host);
 118         priv = sdhci_pltfm_priv(pltfm_host);
 119         priv->dev = dev;
 120
 121         priv->enable_cmd_dat_delay = device_property_read_bool(dev,
 122                                                 "fujitsu,cmd-dat-delay-select");
 123
 124         ret = mmc_of_parse(host->mmc);
 125         if (ret)
 126                 goto err;
 127
 128         if (dev_of_node(dev)) {
 129                 sdhci_get_of_property(pdev);
 130
 131                 priv->clk_iface = devm_clk_get(&pdev->dev, "iface");
 132                 if (IS_ERR(priv->clk_iface)) {
 133                         ret = PTR_ERR(priv->clk_iface);
 134                         goto err;
 135                 }
 136
 137                 ret = clk_prepare_enable(priv->clk_iface);
 138                 if (ret)
 139                         goto err;
 140
 141                 priv->clk = devm_clk_get(&pdev->dev, "core");
 142                 if (IS_ERR(priv->clk)) {
 143                         ret = PTR_ERR(priv->clk);
 144                         goto err_clk;
 145                 }
 146
 147                 ret = clk_prepare_enable(priv->clk);
 148                 if (ret)
 149                         goto err_clk;
 150         }
 151
 152         /* init vendor specific regs */
 153         ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG);
 154         ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 |
 155                 F_SDH30_AHB_INCR_4;
 156         ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN);
 157         sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG);
 158
 159         reg = sdhci_readl(host, F_SDH30_ESD_CONTROL);
 160         sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
 161         msleep(20);
 162         sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
 163
 164         reg = sdhci_readl(host, SDHCI_CAPABILITIES);
 165         if (reg & SDHCI_CAN_DO_8BIT)
 166                 priv->vendor_hs200 = F_SDH30_EMMC_HS200;
 167
 168         if (!(reg & SDHCI_TIMEOUT_CLK_MASK))
 169                 host->quirks |= SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK;
 170
 171         ret = sdhci_add_host(host);
 172         if (ret)
 173                 goto err_add_host;
 174
 175         return 0;
 176
 177 err_add_host:
 178         clk_disable_unprepare(priv->clk);
 179 err_clk:
 180         clk_disable_unprepare(priv->clk_iface);
 181 err:
 182         sdhci_pltfm_free(pdev);
 183
 184         return ret;
 185 }
 186
 187 static int sdhci_f_sdh30_remove(struct platform_device *pdev)
 188 {
 189         struct sdhci_host *host = platform_get_drvdata(pdev);
 190         struct f_sdhost_priv *priv = sdhci_f_sdhost_priv(host);
 191         struct clk *clk_iface = priv->clk_iface;
 192         struct clk *clk = priv->clk;
 193
 194         sdhci_pltfm_unregister(pdev);
 195
 196         clk_disable_unprepare(clk_iface);
 197         clk_disable_unprepare(clk);
 198
 199         return 0;
 200 }
 201
 202 #ifdef CONFIG_OF
 203 static const struct of_device_id f_sdh30_dt_ids[] = {
 204         { .compatible = "fujitsu,mb86s70-sdhci-3.0" },
 205         { /* sentinel */ }
 206 };
 207 MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids);
 208 #endif
 209
 210 #ifdef CONFIG_ACPI
 211 static const struct acpi_device_id f_sdh30_acpi_ids[] = {
 212         { "SCX0002" },
 213         { /* sentinel */ }
 214 };
 215 MODULE_DEVICE_TABLE(acpi, f_sdh30_acpi_ids);
 216 #endif
 217
 218 static struct platform_driver sdhci_f_sdh30_driver = {
 219         .driver = {
 220                 .name = "f_sdh30",
 221                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 222                 .of_match_table = of_match_ptr(f_sdh30_dt_ids),
 223                 .acpi_match_table = ACPI_PTR(f_sdh30_acpi_ids),
 224                 .pm     = &sdhci_pltfm_pmops,
 225         },
 226         .probe  = sdhci_f_sdh30_probe,
 227         .remove = sdhci_f_sdh30_remove,
 228 };
 229
 230 module_platform_driver(sdhci_f_sdh30_driver);
 231
 232 MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver");
 233 MODULE_LICENSE("GPL v2");
 234 MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD.");
 235 MODULE_ALIAS("platform:f_sdh30");