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 void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
  59 {
  60         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  61         struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
  62         bool ctrl_phy = false;
  63
  64         if (clock > MMC_HIGH_52_MAX_DTR && (!IS_ERR(sdhci_arasan->phy)))
  65                 ctrl_phy = true;
  66
  67         if (ctrl_phy) {
  68                 spin_unlock_irq(&host->lock);
  69                 phy_power_off(sdhci_arasan->phy);
  70                 spin_lock_irq(&host->lock);
  71         }
  72
  73         sdhci_set_clock(host, clock);
  74
  75         if (ctrl_phy) {
  76                 spin_unlock_irq(&host->lock);
  77                 phy_power_on(sdhci_arasan->phy);
  78                 spin_lock_irq(&host->lock);
  79         }
  80 }
  81
  82 static struct sdhci_ops sdhci_arasan_ops = {
  83         .set_clock = sdhci_arasan_set_clock,
  84         .get_max_clock = sdhci_pltfm_clk_get_max_clock,
  85         .get_timeout_clock = sdhci_arasan_get_timeout_clock,
  86         .set_bus_width = sdhci_set_bus_width,
  87         .reset = sdhci_reset,
  88         .set_uhs_signaling = sdhci_set_uhs_signaling,
  89 };
  90
  91 static struct sdhci_pltfm_data sdhci_arasan_pdata = {
  92         .ops = &sdhci_arasan_ops,
  93         .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
  94         .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
  95                         SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
  96 };
  97
  98 #ifdef CONFIG_PM_SLEEP
  99 /**
 100  * sdhci_arasan_suspend - Suspend method for the driver
 101  * @dev:        Address of the device structure
 102  * Returns 0 on success and error value on error
 103  *
 104  * Put the device in a low power state.
 105  */
 106 static int sdhci_arasan_suspend(struct device *dev)
 107 {
 108         struct platform_device *pdev = to_platform_device(dev);
 109         struct sdhci_host *host = platform_get_drvdata(pdev);
 110         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 111         struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
 112         int ret;
 113
 114         ret = sdhci_suspend_host(host);
 115         if (ret)
 116                 return ret;
 117
 118         if (!IS_ERR(sdhci_arasan->phy)) {
 119                 ret = phy_power_off(sdhci_arasan->phy);
 120                 if (ret) {
 121                         dev_err(dev, "Cannot power off phy.\n");
 122                         sdhci_resume_host(host);
 123                         return ret;
 124                 }
 125         }
 126
 127         clk_disable(pltfm_host->clk);
 128         clk_disable(sdhci_arasan->clk_ahb);
 129
 130         return 0;
 131 }
 132
 133 /**
 134  * sdhci_arasan_resume - Resume method for the driver
 135  * @dev:        Address of the device structure
 136  * Returns 0 on success and error value on error
 137  *
 138  * Resume operation after suspend
 139  */
 140 static int sdhci_arasan_resume(struct device *dev)
 141 {
 142         struct platform_device *pdev = to_platform_device(dev);
 143         struct sdhci_host *host = platform_get_drvdata(pdev);
 144         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 145         struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
 146         int ret;
 147
 148         ret = clk_enable(sdhci_arasan->clk_ahb);
 149         if (ret) {
 150                 dev_err(dev, "Cannot enable AHB clock.\n");
 151                 return ret;
 152         }
 153
 154         ret = clk_enable(pltfm_host->clk);
 155         if (ret) {
 156                 dev_err(dev, "Cannot enable SD clock.\n");
 157                 return ret;
 158         }
 159
 160         if (!IS_ERR(sdhci_arasan->phy)) {
 161                 ret = phy_power_on(sdhci_arasan->phy);
 162                 if (ret) {
 163                         dev_err(dev, "Cannot power on phy.\n");
 164                         return ret;
 165                 }
 166         }
 167
 168         return sdhci_resume_host(host);
 169 }
 170 #endif /* ! CONFIG_PM_SLEEP */
 171
 172 static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
 173                          sdhci_arasan_resume);
 174
 175 static int sdhci_arasan_probe(struct platform_device *pdev)
 176 {
 177         int ret;
 178         struct clk *clk_xin;
 179         struct sdhci_host *host;
 180         struct sdhci_pltfm_host *pltfm_host;
 181         struct sdhci_arasan_data *sdhci_arasan;
 182
 183         host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata,
 184                                 sizeof(*sdhci_arasan));
 185         if (IS_ERR(host))
 186                 return PTR_ERR(host);
 187
 188         pltfm_host = sdhci_priv(host);
 189         sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
 190
 191         sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
 192         if (IS_ERR(sdhci_arasan->clk_ahb)) {
 193                 dev_err(&pdev->dev, "clk_ahb clock not found.\n");
 194                 ret = PTR_ERR(sdhci_arasan->clk_ahb);
 195                 goto err_pltfm_free;
 196         }
 197
 198         clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
 199         if (IS_ERR(clk_xin)) {
 200                 dev_err(&pdev->dev, "clk_xin clock not found.\n");
 201                 ret = PTR_ERR(clk_xin);
 202                 goto err_pltfm_free;
 203         }
 204
 205         ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
 206         if (ret) {
 207                 dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
 208                 goto err_pltfm_free;
 209         }
 210
 211         ret = clk_prepare_enable(clk_xin);
 212         if (ret) {
 213                 dev_err(&pdev->dev, "Unable to enable SD clock.\n");
 214                 goto clk_dis_ahb;
 215         }
 216
 217         sdhci_get_of_property(pdev);
 218         pltfm_host->clk = clk_xin;
 219
 220         ret = mmc_of_parse(host->mmc);
 221         if (ret) {
 222                 dev_err(&pdev->dev, "parsing dt failed (%u)\n", ret);
 223                 goto clk_disable_all;
 224         }
 225
 226         sdhci_arasan->phy = ERR_PTR(-ENODEV);
 227         if (of_device_is_compatible(pdev->dev.of_node,
 228                                     "arasan,sdhci-5.1")) {
 229                 sdhci_arasan->phy = devm_phy_get(&pdev->dev,
 230                                                  "phy_arasan");
 231                 if (IS_ERR(sdhci_arasan->phy)) {
 232                         ret = PTR_ERR(sdhci_arasan->phy);
 233                         dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");
 234                         goto clk_disable_all;
 235                 }
 236
 237                 ret = phy_init(sdhci_arasan->phy);
 238                 if (ret < 0) {
 239                         dev_err(&pdev->dev, "phy_init err.\n");
 240                         goto clk_disable_all;
 241                 }
 242
 243                 ret = phy_power_on(sdhci_arasan->phy);
 244                 if (ret < 0) {
 245                         dev_err(&pdev->dev, "phy_power_on err.\n");
 246                         goto err_phy_power;
 247                 }
 248         }
 249
 250         ret = sdhci_add_host(host);
 251         if (ret)
 252                 goto err_add_host;
 253
 254         return 0;
 255
 256 err_add_host:
 257         if (!IS_ERR(sdhci_arasan->phy))
 258                 phy_power_off(sdhci_arasan->phy);
 259 err_phy_power:
 260         if (!IS_ERR(sdhci_arasan->phy))
 261                 phy_exit(sdhci_arasan->phy);
 262 clk_disable_all:
 263         clk_disable_unprepare(clk_xin);
 264 clk_dis_ahb:
 265         clk_disable_unprepare(sdhci_arasan->clk_ahb);
 266 err_pltfm_free:
 267         sdhci_pltfm_free(pdev);
 268         return ret;
 269 }
 270
 271 static int sdhci_arasan_remove(struct platform_device *pdev)
 272 {
 273         int ret;
 274         struct sdhci_host *host = platform_get_drvdata(pdev);
 275         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 276         struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
 277         struct clk *clk_ahb = sdhci_arasan->clk_ahb;
 278
 279         if (!IS_ERR(sdhci_arasan->phy)) {
 280                 phy_power_off(sdhci_arasan->phy);
 281                 phy_exit(sdhci_arasan->phy);
 282         }
 283
 284         ret = sdhci_pltfm_unregister(pdev);
 285
 286         clk_disable_unprepare(clk_ahb);
 287
 288         return ret;
 289 }
 290
 291 static const struct of_device_id sdhci_arasan_of_match[] = {
 292         { .compatible = "arasan,sdhci-8.9a" },
 293         { .compatible = "arasan,sdhci-5.1" },
 294         { .compatible = "arasan,sdhci-4.9a" },
 295         { }
 296 };
 297 MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
 298
 299 static struct platform_driver sdhci_arasan_driver = {
 300         .driver = {
 301                 .name = "sdhci-arasan",
 302                 .of_match_table = sdhci_arasan_of_match,
 303                 .pm = &sdhci_arasan_dev_pm_ops,
 304         },
 305         .probe = sdhci_arasan_probe,
 306         .remove = sdhci_arasan_remove,
 307 };
 308
 309 module_platform_driver(sdhci_arasan_driver);
 310
 311 MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
 312 MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
 313 MODULE_LICENSE("GPL");