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         struct resource *res;
  93         int irq, ctrl = 0, ret = 0;
  94         struct f_sdhost_priv *priv;
  95         u32 reg = 0;
  96
  97         irq = platform_get_irq(pdev, 0);
  98         if (irq < 0)
  99                 return irq;
 100
 101         host = sdhci_alloc_host(dev, sizeof(struct f_sdhost_priv));
 102         if (IS_ERR(host))
 103                 return PTR_ERR(host);
 104
 105         priv = sdhci_priv(host);
 106         priv->dev = dev;
 107
 108         host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
 109                        SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
 110         host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
 111                         SDHCI_QUIRK2_TUNING_WORK_AROUND;
 112
 113         priv->enable_cmd_dat_delay = device_property_read_bool(dev,
 114                                                 "fujitsu,cmd-dat-delay-select");
 115
 116         ret = mmc_of_parse(host->mmc);
 117         if (ret)
 118                 goto err;
 119
 120         platform_set_drvdata(pdev, host);
 121
 122         host->hw_name = "f_sdh30";
 123         host->ops = &sdhci_f_sdh30_ops;
 124         host->irq = irq;
 125
 126         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 127         host->ioaddr = devm_ioremap_resource(&pdev->dev, res);
 128         if (IS_ERR(host->ioaddr)) {
 129                 ret = PTR_ERR(host->ioaddr);
 130                 goto err;
 131         }
 132
 133         if (dev_of_node(dev)) {
 134                 sdhci_get_of_property(pdev);
 135
 136                 priv->clk_iface = devm_clk_get(&pdev->dev, "iface");
 137                 if (IS_ERR(priv->clk_iface)) {
 138                         ret = PTR_ERR(priv->clk_iface);
 139                         goto err;
 140                 }
 141
 142                 ret = clk_prepare_enable(priv->clk_iface);
 143                 if (ret)
 144                         goto err;
 145
 146                 priv->clk = devm_clk_get(&pdev->dev, "core");
 147                 if (IS_ERR(priv->clk)) {
 148                         ret = PTR_ERR(priv->clk);
 149                         goto err_clk;
 150                 }
 151
 152                 ret = clk_prepare_enable(priv->clk);
 153                 if (ret)
 154                         goto err_clk;
 155         }
 156
 157         /* init vendor specific regs */
 158         ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG);
 159         ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 |
 160                 F_SDH30_AHB_INCR_4;
 161         ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN);
 162         sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG);
 163
 164         reg = sdhci_readl(host, F_SDH30_ESD_CONTROL);
 165         sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
 166         msleep(20);
 167         sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
 168
 169         reg = sdhci_readl(host, SDHCI_CAPABILITIES);
 170         if (reg & SDHCI_CAN_DO_8BIT)
 171                 priv->vendor_hs200 = F_SDH30_EMMC_HS200;
 172
 173         ret = sdhci_add_host(host);
 174         if (ret)
 175                 goto err_add_host;
 176
 177         return 0;
 178
 179 err_add_host:
 180         clk_disable_unprepare(priv->clk);
 181 err_clk:
 182         clk_disable_unprepare(priv->clk_iface);
 183 err:
 184         sdhci_free_host(host);
 185         return ret;
 186 }
 187
 188 static int sdhci_f_sdh30_remove(struct platform_device *pdev)
 189 {
 190         struct sdhci_host *host = platform_get_drvdata(pdev);
 191         struct f_sdhost_priv *priv = sdhci_priv(host);
 192
 193         sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) ==
 194                           0xffffffff);
 195
 196         clk_disable_unprepare(priv->clk_iface);
 197         clk_disable_unprepare(priv->clk);
 198
 199         sdhci_free_host(host);
 200         platform_set_drvdata(pdev, NULL);
 201
 202         return 0;
 203 }
 204
 205 #ifdef CONFIG_OF
 206 static const struct of_device_id f_sdh30_dt_ids[] = {
 207         { .compatible = "fujitsu,mb86s70-sdhci-3.0" },
 208         { /* sentinel */ }
 209 };
 210 MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids);
 211 #endif
 212
 213 #ifdef CONFIG_ACPI
 214 static const struct acpi_device_id f_sdh30_acpi_ids[] = {
 215         { "SCX0002" },
 216         { /* sentinel */ }
 217 };
 218 MODULE_DEVICE_TABLE(acpi, f_sdh30_acpi_ids);
 219 #endif
 220
 221 static struct platform_driver sdhci_f_sdh30_driver = {
 222         .driver = {
 223                 .name = "f_sdh30",
 224                 .of_match_table = of_match_ptr(f_sdh30_dt_ids),
 225                 .acpi_match_table = ACPI_PTR(f_sdh30_acpi_ids),
 226                 .pm     = &sdhci_pltfm_pmops,
 227         },
 228         .probe  = sdhci_f_sdh30_probe,
 229         .remove = sdhci_f_sdh30_remove,
 230 };
 231
 232 module_platform_driver(sdhci_f_sdh30_driver);
 233
 234 MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver");
 235 MODULE_LICENSE("GPL v2");
 236 MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD.");
 237 MODULE_ALIAS("platform:f_sdh30");