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_sdh30_soft_voltage_switch(struct sdhci_host *host)
  30 {
  31         struct f_sdhost_priv *priv = sdhci_priv(host);
  32         u32 ctrl = 0;
  33
  34         usleep_range(2500, 3000);
  35         ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2);
  36         ctrl |= F_SDH30_CRES_O_DN;
  37         sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
  38         ctrl |= F_SDH30_MSEL_O_1_8;
  39         sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
  40
  41         ctrl &= ~F_SDH30_CRES_O_DN;
  42         sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
  43         usleep_range(2500, 3000);
  44
  45         if (priv->vendor_hs200) {
  46                 dev_info(priv->dev, "%s: setting hs200\n", __func__);
  47                 ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
  48                 ctrl |= priv->vendor_hs200;
  49                 sdhci_writel(host, ctrl, F_SDH30_ESD_CONTROL);
  50         }
  51
  52         ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING);
  53         ctrl |= F_SDH30_CMD_CHK_DIS;
  54         sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING);
  55 }
  56
  57 static unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host)
  58 {
  59         return F_SDH30_MIN_CLOCK;
  60 }
  61
  62 static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask)
  63 {
  64         struct f_sdhost_priv *priv = sdhci_priv(host);
  65         u32 ctl;
  66
  67         if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0)
  68                 sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL);
  69
  70         sdhci_reset(host, mask);
  71
  72         if (priv->enable_cmd_dat_delay) {
  73                 ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
  74                 ctl |= F_SDH30_CMD_DAT_DELAY;
  75                 sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL);
  76         }
  77 }
  78
  79 static const struct sdhci_ops sdhci_f_sdh30_ops = {
  80         .voltage_switch = sdhci_f_sdh30_soft_voltage_switch,
  81         .get_min_clock = sdhci_f_sdh30_get_min_clock,
  82         .reset = sdhci_f_sdh30_reset,
  83         .set_clock = sdhci_set_clock,
  84         .set_bus_width = sdhci_set_bus_width,
  85         .set_uhs_signaling = sdhci_set_uhs_signaling,
  86 };
  87
  88 static int sdhci_f_sdh30_probe(struct platform_device *pdev)
  89 {
  90         struct sdhci_host *host;
  91         struct device *dev = &pdev->dev;
  92         int irq, ctrl = 0, ret = 0;
  93         struct f_sdhost_priv *priv;
  94         u32 reg = 0;
  95
  96         irq = platform_get_irq(pdev, 0);
  97         if (irq < 0)
  98                 return irq;
  99
 100         host = sdhci_alloc_host(dev, sizeof(struct f_sdhost_priv));
 101         if (IS_ERR(host))
 102                 return PTR_ERR(host);
 103
 104         priv = sdhci_priv(host);
 105         priv->dev = dev;
 106
 107         host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
 108                        SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
 109         host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
 110                         SDHCI_QUIRK2_TUNING_WORK_AROUND;
 111
 112         priv->enable_cmd_dat_delay = device_property_read_bool(dev,
 113                                                 "fujitsu,cmd-dat-delay-select");
 114
 115         ret = mmc_of_parse(host->mmc);
 116         if (ret)
 117                 goto err;
 118
 119         platform_set_drvdata(pdev, host);
 120
 121         host->hw_name = "f_sdh30";
 122         host->ops = &sdhci_f_sdh30_ops;
 123         host->irq = irq;
 124
 125         host->ioaddr = devm_platform_ioremap_resource(pdev, 0);
 126         if (IS_ERR(host->ioaddr)) {
 127                 ret = PTR_ERR(host->ioaddr);
 128                 goto err;
 129         }
 130
 131         if (dev_of_node(dev)) {
 132                 sdhci_get_of_property(pdev);
 133
 134                 priv->clk_iface = devm_clk_get(&pdev->dev, "iface");
 135                 if (IS_ERR(priv->clk_iface)) {
 136                         ret = PTR_ERR(priv->clk_iface);
 137                         goto err;
 138                 }
 139
 140                 ret = clk_prepare_enable(priv->clk_iface);
 141                 if (ret)
 142                         goto err;
 143
 144                 priv->clk = devm_clk_get(&pdev->dev, "core");
 145                 if (IS_ERR(priv->clk)) {
 146                         ret = PTR_ERR(priv->clk);
 147                         goto err_clk;
 148                 }
 149
 150                 ret = clk_prepare_enable(priv->clk);
 151                 if (ret)
 152                         goto err_clk;
 153         }
 154
 155         /* init vendor specific regs */
 156         ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG);
 157         ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 |
 158                 F_SDH30_AHB_INCR_4;
 159         ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN);
 160         sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG);
 161
 162         reg = sdhci_readl(host, F_SDH30_ESD_CONTROL);
 163         sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
 164         msleep(20);
 165         sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
 166
 167         reg = sdhci_readl(host, SDHCI_CAPABILITIES);
 168         if (reg & SDHCI_CAN_DO_8BIT)
 169                 priv->vendor_hs200 = F_SDH30_EMMC_HS200;
 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_free_host(host);
 183         return ret;
 184 }
 185
 186 static int sdhci_f_sdh30_remove(struct platform_device *pdev)
 187 {
 188         struct sdhci_host *host = platform_get_drvdata(pdev);
 189         struct f_sdhost_priv *priv = sdhci_priv(host);
 190
 191         sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) ==
 192                           0xffffffff);
 193
 194         clk_disable_unprepare(priv->clk_iface);
 195         clk_disable_unprepare(priv->clk);
 196
 197         sdhci_free_host(host);
 198         platform_set_drvdata(pdev, NULL);
 199
 200         return 0;
 201 }
 202
 203 #ifdef CONFIG_OF
 204 static const struct of_device_id f_sdh30_dt_ids[] = {
 205         { .compatible = "fujitsu,mb86s70-sdhci-3.0" },
 206         { /* sentinel */ }
 207 };
 208 MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids);
 209 #endif
 210
 211 #ifdef CONFIG_ACPI
 212 static const struct acpi_device_id f_sdh30_acpi_ids[] = {
 213         { "SCX0002" },
 214         { /* sentinel */ }
 215 };
 216 MODULE_DEVICE_TABLE(acpi, f_sdh30_acpi_ids);
 217 #endif
 218
 219 static struct platform_driver sdhci_f_sdh30_driver = {
 220         .driver = {
 221                 .name = "f_sdh30",
 222                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 223                 .of_match_table = of_match_ptr(f_sdh30_dt_ids),
 224                 .acpi_match_table = ACPI_PTR(f_sdh30_acpi_ids),
 225                 .pm     = &sdhci_pltfm_pmops,
 226         },
 227         .probe  = sdhci_f_sdh30_probe,
 228         .remove = sdhci_f_sdh30_remove,
 229 };
 230
 231 module_platform_driver(sdhci_f_sdh30_driver);
 232
 233 MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver");
 234 MODULE_LICENSE("GPL v2");
 235 MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD.");
 236 MODULE_ALIAS("platform:f_sdh30");