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  * Returns 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 = sdhci_pltfm_priv(pltfm_host);
  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                         sdhci_resume_host(host);
  99                         return ret;
 100                 }
 101         }
 102
 103         clk_disable(pltfm_host->clk);
 104         clk_disable(sdhci_arasan->clk_ahb);
 105
 106         return 0;
 107 }
 108
 109 /**
 110  * sdhci_arasan_resume - Resume method for the driver
 111  * @dev:        Address of the device structure
 112  * Returns 0 on success and error value on error
 113  *
 114  * Resume operation after suspend
 115  */
 116 static int sdhci_arasan_resume(struct device *dev)
 117 {
 118         struct platform_device *pdev = to_platform_device(dev);
 119         struct sdhci_host *host = platform_get_drvdata(pdev);
 120         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 121         struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
 122         int ret;
 123
 124         ret = clk_enable(sdhci_arasan->clk_ahb);
 125         if (ret) {
 126                 dev_err(dev, "Cannot enable AHB clock.\n");
 127                 return ret;
 128         }
 129
 130         ret = clk_enable(pltfm_host->clk);
 131         if (ret) {
 132                 dev_err(dev, "Cannot enable SD clock.\n");
 133                 return ret;
 134         }
 135
 136         if (!IS_ERR(sdhci_arasan->phy)) {
 137                 ret = phy_power_on(sdhci_arasan->phy);
 138                 if (ret) {
 139                         dev_err(dev, "Cannot power on phy.\n");
 140                         return ret;
 141                 }
 142         }
 143
 144         return sdhci_resume_host(host);
 145 }
 146 #endif /* ! CONFIG_PM_SLEEP */
 147
 148 static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
 149                          sdhci_arasan_resume);
 150
 151 static int sdhci_arasan_probe(struct platform_device *pdev)
 152 {
 153         int ret;
 154         struct clk *clk_xin;
 155         struct sdhci_host *host;
 156         struct sdhci_pltfm_host *pltfm_host;
 157         struct sdhci_arasan_data *sdhci_arasan;
 158
 159         host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata,
 160                                 sizeof(*sdhci_arasan));
 161         if (IS_ERR(host))
 162                 return PTR_ERR(host);
 163
 164         pltfm_host = sdhci_priv(host);
 165         sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
 166
 167         sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
 168         if (IS_ERR(sdhci_arasan->clk_ahb)) {
 169                 dev_err(&pdev->dev, "clk_ahb clock not found.\n");
 170                 ret = PTR_ERR(sdhci_arasan->clk_ahb);
 171                 goto err_pltfm_free;
 172         }
 173
 174         clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
 175         if (IS_ERR(clk_xin)) {
 176                 dev_err(&pdev->dev, "clk_xin clock not found.\n");
 177                 ret = PTR_ERR(clk_xin);
 178                 goto err_pltfm_free;
 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                 goto err_pltfm_free;
 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         sdhci_get_of_property(pdev);
 194         pltfm_host->clk = clk_xin;
 195
 196         ret = mmc_of_parse(host->mmc);
 197         if (ret) {
 198                 dev_err(&pdev->dev, "parsing dt failed (%u)\n", ret);
 199                 goto clk_disable_all;
 200         }
 201
 202         sdhci_arasan->phy = ERR_PTR(-ENODEV);
 203         if (of_device_is_compatible(pdev->dev.of_node,
 204                                     "arasan,sdhci-5.1")) {
 205                 sdhci_arasan->phy = devm_phy_get(&pdev->dev,
 206                                                  "phy_arasan");
 207                 if (IS_ERR(sdhci_arasan->phy)) {
 208                         ret = PTR_ERR(sdhci_arasan->phy);
 209                         dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");
 210                         goto clk_disable_all;
 211                 }
 212
 213                 ret = phy_init(sdhci_arasan->phy);
 214                 if (ret < 0) {
 215                         dev_err(&pdev->dev, "phy_init err.\n");
 216                         goto clk_disable_all;
 217                 }
 218
 219                 ret = phy_power_on(sdhci_arasan->phy);
 220                 if (ret < 0) {
 221                         dev_err(&pdev->dev, "phy_power_on err.\n");
 222                         goto err_phy_power;
 223                 }
 224         }
 225
 226         ret = sdhci_add_host(host);
 227         if (ret)
 228                 goto err_add_host;
 229
 230         return 0;
 231
 232 err_add_host:
 233         if (!IS_ERR(sdhci_arasan->phy))
 234                 phy_power_off(sdhci_arasan->phy);
 235 err_phy_power:
 236         if (!IS_ERR(sdhci_arasan->phy))
 237                 phy_exit(sdhci_arasan->phy);
 238 clk_disable_all:
 239         clk_disable_unprepare(clk_xin);
 240 clk_dis_ahb:
 241         clk_disable_unprepare(sdhci_arasan->clk_ahb);
 242 err_pltfm_free:
 243         sdhci_pltfm_free(pdev);
 244         return ret;
 245 }
 246
 247 static int sdhci_arasan_remove(struct platform_device *pdev)
 248 {
 249         int ret;
 250         struct sdhci_host *host = platform_get_drvdata(pdev);
 251         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 252         struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
 253         struct clk *clk_ahb = sdhci_arasan->clk_ahb;
 254
 255         if (!IS_ERR(sdhci_arasan->phy)) {
 256                 phy_power_off(sdhci_arasan->phy);
 257                 phy_exit(sdhci_arasan->phy);
 258         }
 259
 260         ret = sdhci_pltfm_unregister(pdev);
 261
 262         clk_disable_unprepare(clk_ahb);
 263
 264         return ret;
 265 }
 266
 267 static const struct of_device_id sdhci_arasan_of_match[] = {
 268         { .compatible = "arasan,sdhci-8.9a" },
 269         { .compatible = "arasan,sdhci-5.1" },
 270         { .compatible = "arasan,sdhci-4.9a" },
 271         { }
 272 };
 273 MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
 274
 275 static struct platform_driver sdhci_arasan_driver = {
 276         .driver = {
 277                 .name = "sdhci-arasan",
 278                 .of_match_table = sdhci_arasan_of_match,
 279                 .pm = &sdhci_arasan_dev_pm_ops,
 280         },
 281         .probe = sdhci_arasan_probe,
 282         .remove = sdhci_arasan_remove,
 283 };
 284
 285 module_platform_driver(sdhci_arasan_driver);
 286
 287 MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
 288 MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
 289 MODULE_LICENSE("GPL");