drivers/mmc/host/sdhci-of-arasan.c

   1 /*
   2  * Arasan Secure Digital Host Controller Interface.
   3  * Copyright (C) 2011 - 2012 Michal Simek <monstr@monstr.eu>
   4  * Copyright (c) 2012 Wind River Systems, Inc.
   5  * Copyright (C) 2013 Pengutronix e.K.
   6  * Copyright (C) 2013 Xilinx Inc.
   7  *
   8  * Based on sdhci-of-esdhc.c
   9  *
  10  * Copyright (c) 2007 Freescale Semiconductor, Inc.
  11  * Copyright (c) 2009 MontaVista Software, Inc.
  12  *
  13  * Authors: Xiaobo Xie <X.Xie@freescale.com>
  14  *          Anton Vorontsov <avorontsov@ru.mvista.com>
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or (at
  19  * your option) any later version.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/of_device.h>
  24 #include <linux/phy/phy.h>
  25 #include "sdhci-pltfm.h"
  26
  27 #define SDHCI_ARASAN_CLK_CTRL_OFFSET    0x2c
  28
  29 #define CLK_CTRL_TIMEOUT_SHIFT          16
  30 #define CLK_CTRL_TIMEOUT_MASK           (0xf << CLK_CTRL_TIMEOUT_SHIFT)
  31 #define CLK_CTRL_TIMEOUT_MIN_EXP        13
  32
  33 /**
  34  * struct sdhci_arasan_data
  35  * @clk_ahb:    Pointer to the AHB clock
  36  * @phy: Pointer to the generic phy
  37  */
  38 struct sdhci_arasan_data {
  39         struct clk      *clk_ahb;
  40         struct phy      *phy;
  41 };
  42
  43 static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
  44 {
  45         u32 div;
  46         unsigned long freq;
  47         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  48
  49         div = readl(host->ioaddr + SDHCI_ARASAN_CLK_CTRL_OFFSET);
  50         div = (div & CLK_CTRL_TIMEOUT_MASK) >> CLK_CTRL_TIMEOUT_SHIFT;
  51
  52         freq = clk_get_rate(pltfm_host->clk);
  53         freq /= 1 << (CLK_CTRL_TIMEOUT_MIN_EXP + div);
  54
  55         return freq;
  56 }
  57
  58 static struct sdhci_ops sdhci_arasan_ops = {
  59         .set_clock = sdhci_set_clock,
  60         .get_max_clock = sdhci_pltfm_clk_get_max_clock,
  61         .get_timeout_clock = sdhci_arasan_get_timeout_clock,
  62         .set_bus_width = sdhci_set_bus_width,
  63         .reset = sdhci_reset,
  64         .set_uhs_signaling = sdhci_set_uhs_signaling,
  65 };
  66
  67 static struct sdhci_pltfm_data sdhci_arasan_pdata = {
  68         .ops = &sdhci_arasan_ops,
  69         .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
  70         .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
  71                         SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
  72 };
  73
  74 #ifdef CONFIG_PM_SLEEP
  75 /**
  76  * sdhci_arasan_suspend - Suspend method for the driver
  77  * @dev:        Address of the device structure
  78  * Return: 0 on success and error value on error
  79  *
  80  * Put the device in a low power state.
  81  */
  82 static int sdhci_arasan_suspend(struct device *dev)
  83 {
  84         struct platform_device *pdev = to_platform_device(dev);
  85         struct sdhci_host *host = platform_get_drvdata(pdev);
  86         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  87         struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
  88         int ret;
  89
  90         ret = sdhci_suspend_host(host);
  91         if (ret)
  92                 return ret;
  93
  94         if (!IS_ERR(sdhci_arasan->phy)) {
  95                 ret = phy_power_off(sdhci_arasan->phy);
  96                 if (ret) {
  97                         dev_err(dev, "Cannot power off phy.\n");
  98                         return ret;
  99                 }
 100         }
 101
 102         clk_disable(pltfm_host->clk);
 103         clk_disable(sdhci_arasan->clk_ahb);
 104
 105         return 0;
 106 }
 107
 108 /**
 109  * sdhci_arasan_resume - Resume method for the driver
 110  * @dev:        Address of the device structure
 111  * Return: 0 on success and error value on error
 112  *
 113  * Resume operation after suspend
 114  */
 115 static int sdhci_arasan_resume(struct device *dev)
 116 {
 117         struct platform_device *pdev = to_platform_device(dev);
 118         struct sdhci_host *host = platform_get_drvdata(pdev);
 119         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 120         struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
 121         int ret;
 122
 123         ret = clk_enable(sdhci_arasan->clk_ahb);
 124         if (ret) {
 125                 dev_err(dev, "Cannot enable AHB clock.\n");
 126                 return ret;
 127         }
 128
 129         ret = clk_enable(pltfm_host->clk);
 130         if (ret) {
 131                 dev_err(dev, "Cannot enable SD clock.\n");
 132                 goto err_clk_en;
 133         }
 134
 135         if (!IS_ERR(sdhci_arasan->phy)) {
 136                 ret = phy_power_on(sdhci_arasan->phy);
 137                 if (ret) {
 138                         dev_err(dev, "Cannot power on phy.\n");
 139                         goto err_phy_power;
 140                 }
 141         }
 142
 143         return sdhci_resume_host(host);
 144
 145 err_phy_power:
 146         clk_disable(pltfm_host->clk);
 147 err_clk_en:
 148         clk_disable(sdhci_arasan->clk_ahb);
 149         return ret;
 150 }
 151 #endif /* ! CONFIG_PM_SLEEP */
 152
 153 static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
 154                          sdhci_arasan_resume);
 155
 156 static int sdhci_arasan_probe(struct platform_device *pdev)
 157 {
 158         int ret;
 159         struct clk *clk_xin;
 160         struct sdhci_host *host;
 161         struct sdhci_pltfm_host *pltfm_host;
 162         struct sdhci_arasan_data *sdhci_arasan;
 163
 164         sdhci_arasan = devm_kzalloc(&pdev->dev, sizeof(*sdhci_arasan),
 165                         GFP_KERNEL);
 166         if (!sdhci_arasan)
 167                 return -ENOMEM;
 168
 169         sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
 170         if (IS_ERR(sdhci_arasan->clk_ahb)) {
 171                 dev_err(&pdev->dev, "clk_ahb clock not found.\n");
 172                 return PTR_ERR(sdhci_arasan->clk_ahb);
 173         }
 174
 175         clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
 176         if (IS_ERR(clk_xin)) {
 177                 dev_err(&pdev->dev, "clk_xin clock not found.\n");
 178                 return PTR_ERR(clk_xin);
 179         }
 180
 181         ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
 182         if (ret) {
 183                 dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
 184                 return ret;
 185         }
 186
 187         ret = clk_prepare_enable(clk_xin);
 188         if (ret) {
 189                 dev_err(&pdev->dev, "Unable to enable SD clock.\n");
 190                 goto clk_dis_ahb;
 191         }
 192
 193         host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, 0);
 194         if (IS_ERR(host)) {
 195                 ret = PTR_ERR(host);
 196                 goto clk_disable_all;
 197         }
 198
 199         if (of_device_is_compatible(pdev->dev.of_node, "arasan,sdhci-4.9a")) {
 200                 host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
 201                 host->quirks2 |= SDHCI_QUIRK2_HOST_NO_CMD23;
 202         }
 203
 204         sdhci_get_of_property(pdev);
 205         pltfm_host = sdhci_priv(host);
 206         pltfm_host->priv = sdhci_arasan;
 207         pltfm_host->clk = clk_xin;
 208
 209         ret = mmc_of_parse(host->mmc);
 210         if (ret) {
 211                 dev_err(&pdev->dev, "parsing dt failed (%u)\n", ret);
 212                 goto clk_disable_all;
 213         }
 214
 215         sdhci_arasan->phy = ERR_PTR(-ENODEV);
 216         if (of_device_is_compatible(pdev->dev.of_node,
 217                                     "arasan,sdhci-5.1")) {
 218                 sdhci_arasan->phy = devm_phy_get(&pdev->dev,
 219                                                  "phy_arasan");
 220                 if (IS_ERR(sdhci_arasan->phy)) {
 221                         ret = PTR_ERR(sdhci_arasan->phy);
 222                         dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");
 223                         goto clk_disable_all;
 224                 }
 225
 226                 ret = phy_init(sdhci_arasan->phy);
 227                 if (ret < 0) {
 228                         dev_err(&pdev->dev, "phy_init err.\n");
 229                         goto clk_disable_all;
 230                 }
 231
 232                 ret = phy_power_on(sdhci_arasan->phy);
 233                 if (ret < 0) {
 234                         dev_err(&pdev->dev, "phy_power_on err.\n");
 235                         goto err_phy_power;
 236                 }
 237         }
 238
 239         ret = sdhci_add_host(host);
 240         if (ret)
 241                 goto err_pltfm_free;
 242
 243         return 0;
 244
 245 err_pltfm_free:
 246         if (!IS_ERR(sdhci_arasan->phy))
 247                 phy_power_off(sdhci_arasan->phy);
 248         sdhci_pltfm_free(pdev);
 249 err_phy_power:
 250         if (!IS_ERR(sdhci_arasan->phy))
 251                 phy_exit(sdhci_arasan->phy);
 252 clk_disable_all:
 253         clk_disable_unprepare(clk_xin);
 254 clk_dis_ahb:
 255         clk_disable_unprepare(sdhci_arasan->clk_ahb);
 256
 257         return ret;
 258 }
 259
 260 static int sdhci_arasan_remove(struct platform_device *pdev)
 261 {
 262         struct sdhci_host *host = platform_get_drvdata(pdev);
 263         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 264         struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
 265
 266         if (!IS_ERR(sdhci_arasan->phy)) {
 267                 phy_power_off(sdhci_arasan->phy);
 268                 phy_exit(sdhci_arasan->phy);
 269         }
 270
 271         clk_disable_unprepare(sdhci_arasan->clk_ahb);
 272
 273         return sdhci_pltfm_unregister(pdev);
 274 }
 275
 276 static const struct of_device_id sdhci_arasan_of_match[] = {
 277         { .compatible = "arasan,sdhci-8.9a" },
 278         { .compatible = "arasan,sdhci-5.1" },
 279         { .compatible = "arasan,sdhci-4.9a" },
 280         { }
 281 };
 282 MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
 283
 284 static struct platform_driver sdhci_arasan_driver = {
 285         .driver = {
 286                 .name = "sdhci-arasan",
 287                 .of_match_table = sdhci_arasan_of_match,
 288                 .pm = &sdhci_arasan_dev_pm_ops,
 289         },
 290         .probe = sdhci_arasan_probe,
 291         .remove = sdhci_arasan_remove,
 292 };
 293
 294 module_platform_driver(sdhci_arasan_driver);
 295
 296 MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
 297 MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
 298 MODULE_LICENSE("GPL");