kernel/drivers/mmc/host/sdhci_f_sdh30.c

   1 /*
   2  * linux/drivers/mmc/host/sdhci_f_sdh30.c
   3  *
   4  * Copyright (C) 2013 - 2015 Fujitsu Semiconductor, Ltd
   5  *              Vincent Yang <vincent.yang@tw.fujitsu.com>
   6  * Copyright (C) 2015 Linaro Ltd  Andy Green <andy.green@linaro.org>
   7  *
   8  * This program is free software: you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation, version 2 of the License.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/delay.h>
  15 #include <linux/module.h>
  16 #include <linux/clk.h>
  17
  18 #include "sdhci-pltfm.h"
  19
  20 /* F_SDH30 extended Controller registers */
  21 #define F_SDH30_AHB_CONFIG              0x100
  22 #define  F_SDH30_AHB_BIGED              0x00000040
  23 #define  F_SDH30_BUSLOCK_DMA            0x00000020
  24 #define  F_SDH30_BUSLOCK_EN             0x00000010
  25 #define  F_SDH30_SIN                    0x00000008
  26 #define  F_SDH30_AHB_INCR_16            0x00000004
  27 #define  F_SDH30_AHB_INCR_8             0x00000002
  28 #define  F_SDH30_AHB_INCR_4             0x00000001
  29
  30 #define F_SDH30_TUNING_SETTING          0x108
  31 #define  F_SDH30_CMD_CHK_DIS            0x00010000
  32
  33 #define F_SDH30_IO_CONTROL2             0x114
  34 #define  F_SDH30_CRES_O_DN              0x00080000
  35 #define  F_SDH30_MSEL_O_1_8             0x00040000
  36
  37 #define F_SDH30_ESD_CONTROL             0x124
  38 #define  F_SDH30_EMMC_RST               0x00000002
  39 #define  F_SDH30_EMMC_HS200             0x01000000
  40
  41 #define F_SDH30_CMD_DAT_DELAY           0x200
  42
  43 #define F_SDH30_MIN_CLOCK               400000
  44
  45 struct f_sdhost_priv {
  46         struct clk *clk_iface;
  47         struct clk *clk;
  48         u32 vendor_hs200;
  49         struct device *dev;
  50 };
  51
  52 static void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host)
  53 {
  54         struct f_sdhost_priv *priv = sdhci_priv(host);
  55         u32 ctrl = 0;
  56
  57         usleep_range(2500, 3000);
  58         ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2);
  59         ctrl |= F_SDH30_CRES_O_DN;
  60         sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
  61         ctrl |= F_SDH30_MSEL_O_1_8;
  62         sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
  63
  64         ctrl &= ~F_SDH30_CRES_O_DN;
  65         sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
  66         usleep_range(2500, 3000);
  67
  68         if (priv->vendor_hs200) {
  69                 dev_info(priv->dev, "%s: setting hs200\n", __func__);
  70                 ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
  71                 ctrl |= priv->vendor_hs200;
  72                 sdhci_writel(host, ctrl, F_SDH30_ESD_CONTROL);
  73         }
  74
  75         ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING);
  76         ctrl |= F_SDH30_CMD_CHK_DIS;
  77         sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING);
  78 }
  79
  80 static unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host)
  81 {
  82         return F_SDH30_MIN_CLOCK;
  83 }
  84
  85 static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask)
  86 {
  87         if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0)
  88                 sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL);
  89
  90         sdhci_reset(host, mask);
  91 }
  92
  93 static const struct sdhci_ops sdhci_f_sdh30_ops = {
  94         .voltage_switch = sdhci_f_sdh30_soft_voltage_switch,
  95         .get_min_clock = sdhci_f_sdh30_get_min_clock,
  96         .reset = sdhci_f_sdh30_reset,
  97         .set_clock = sdhci_set_clock,
  98         .set_bus_width = sdhci_set_bus_width,
  99         .set_uhs_signaling = sdhci_set_uhs_signaling,
 100 };
 101
 102 static int sdhci_f_sdh30_probe(struct platform_device *pdev)
 103 {
 104         struct sdhci_host *host;
 105         struct device *dev = &pdev->dev;
 106         struct resource *res;
 107         int irq, ctrl = 0, ret = 0;
 108         struct f_sdhost_priv *priv;
 109         u32 reg = 0;
 110
 111         irq = platform_get_irq(pdev, 0);
 112         if (irq < 0) {
 113                 dev_err(dev, "%s: no irq specified\n", __func__);
 114                 return irq;
 115         }
 116
 117         host = sdhci_alloc_host(dev, sizeof(struct f_sdhost_priv));
 118         if (IS_ERR(host))
 119                 return PTR_ERR(host);
 120
 121         priv = sdhci_priv(host);
 122         priv->dev = dev;
 123
 124         host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
 125                        SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
 126         host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
 127                         SDHCI_QUIRK2_TUNING_WORK_AROUND;
 128
 129         ret = mmc_of_parse(host->mmc);
 130         if (ret)
 131                 goto err;
 132
 133         platform_set_drvdata(pdev, host);
 134
 135         sdhci_get_of_property(pdev);
 136         host->hw_name = "f_sdh30";
 137         host->ops = &sdhci_f_sdh30_ops;
 138         host->irq = irq;
 139
 140         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 141         host->ioaddr = devm_ioremap_resource(&pdev->dev, res);
 142         if (IS_ERR(host->ioaddr)) {
 143                 ret = PTR_ERR(host->ioaddr);
 144                 goto err;
 145         }
 146
 147         priv->clk_iface = devm_clk_get(&pdev->dev, "iface");
 148         if (IS_ERR(priv->clk_iface)) {
 149                 ret = PTR_ERR(priv->clk_iface);
 150                 goto err;
 151         }
 152
 153         ret = clk_prepare_enable(priv->clk_iface);
 154         if (ret)
 155                 goto err;
 156
 157         priv->clk = devm_clk_get(&pdev->dev, "core");
 158         if (IS_ERR(priv->clk)) {
 159                 ret = PTR_ERR(priv->clk);
 160                 goto err_clk;
 161         }
 162
 163         ret = clk_prepare_enable(priv->clk);
 164         if (ret)
 165                 goto err_clk;
 166
 167         /* init vendor specific regs */
 168         ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG);
 169         ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 |
 170                 F_SDH30_AHB_INCR_4;
 171         ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN);
 172         sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG);
 173
 174         reg = sdhci_readl(host, F_SDH30_ESD_CONTROL);
 175         sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
 176         msleep(20);
 177         sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
 178
 179         reg = sdhci_readl(host, SDHCI_CAPABILITIES);
 180         if (reg & SDHCI_CAN_DO_8BIT)
 181                 priv->vendor_hs200 = F_SDH30_EMMC_HS200;
 182
 183         ret = sdhci_add_host(host);
 184         if (ret)
 185                 goto err_add_host;
 186
 187         return 0;
 188
 189 err_add_host:
 190         clk_disable_unprepare(priv->clk);
 191 err_clk:
 192         clk_disable_unprepare(priv->clk_iface);
 193 err:
 194         sdhci_free_host(host);
 195         return ret;
 196 }
 197
 198 static int sdhci_f_sdh30_remove(struct platform_device *pdev)
 199 {
 200         struct sdhci_host *host = platform_get_drvdata(pdev);
 201         struct f_sdhost_priv *priv = sdhci_priv(host);
 202
 203         sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) ==
 204                           0xffffffff);
 205
 206         clk_disable_unprepare(priv->clk_iface);
 207         clk_disable_unprepare(priv->clk);
 208
 209         sdhci_free_host(host);
 210         platform_set_drvdata(pdev, NULL);
 211
 212         return 0;
 213 }
 214
 215 static const struct of_device_id f_sdh30_dt_ids[] = {
 216         { .compatible = "fujitsu,mb86s70-sdhci-3.0" },
 217         { /* sentinel */ }
 218 };
 219 MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids);
 220
 221 static struct platform_driver sdhci_f_sdh30_driver = {
 222         .driver = {
 223                 .name = "f_sdh30",
 224                 .of_match_table = f_sdh30_dt_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");