drivers/mmc/host/sdhci-pxa.c

   1 /* linux/drivers/mmc/host/sdhci-pxa.c
   2  *
   3  * Copyright (C) 2010 Marvell International Ltd.
   4  *              Zhangfei Gao <zhangfei.gao@marvell.com>
   5  *              Kevin Wang <dwang4@marvell.com>
   6  *              Mingwei Wang <mwwang@marvell.com>
   7  *              Philip Rakity <prakity@marvell.com>
   8  *              Mark Brown <markb@marvell.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 /* Supports:
  16  * SDHCI support for MMP2/PXA910/PXA168
  17  *
  18  * Refer to sdhci-s3c.c.
  19  */
  20
  21 #include <linux/delay.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/mmc/host.h>
  24 #include <linux/clk.h>
  25 #include <linux/io.h>
  26 #include <linux/err.h>
  27 #include <plat/sdhci.h>
  28 #include "sdhci.h"
  29
  30 #define DRIVER_NAME     "sdhci-pxa"
  31
  32 #define SD_FIFO_PARAM           0x104
  33 #define DIS_PAD_SD_CLK_GATE     0x400
  34
  35 struct sdhci_pxa {
  36         struct sdhci_host               *host;
  37         struct sdhci_pxa_platdata       *pdata;
  38         struct clk                      *clk;
  39         struct resource                 *res;
  40
  41         u8 clk_enable;
  42 };
  43
  44 /*****************************************************************************\
  45  *                                                                           *
  46  * SDHCI core callbacks                                                      *
  47  *                                                                           *
  48 \*****************************************************************************/
  49 static void set_clock(struct sdhci_host *host, unsigned int clock)
  50 {
  51         struct sdhci_pxa *pxa = sdhci_priv(host);
  52         u32 tmp = 0;
  53
  54         if (clock == 0) {
  55                 if (pxa->clk_enable) {
  56                         clk_disable(pxa->clk);
  57                         pxa->clk_enable = 0;
  58                 }
  59         } else {
  60                 if (0 == pxa->clk_enable) {
  61                         if (pxa->pdata->flags & PXA_FLAG_DISABLE_CLOCK_GATING) {
  62                                 tmp = readl(host->ioaddr + SD_FIFO_PARAM);
  63                                 tmp |= DIS_PAD_SD_CLK_GATE;
  64                                 writel(tmp, host->ioaddr + SD_FIFO_PARAM);
  65                         }
  66                         clk_enable(pxa->clk);
  67                         pxa->clk_enable = 1;
  68                 }
  69         }
  70 }
  71
  72 static struct sdhci_ops sdhci_pxa_ops = {
  73         .set_clock = set_clock,
  74 };
  75
  76 /*****************************************************************************\
  77  *                                                                           *
  78  * Device probing/removal                                                    *
  79  *                                                                           *
  80 \*****************************************************************************/
  81
  82 static int __devinit sdhci_pxa_probe(struct platform_device *pdev)
  83 {
  84         struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
  85         struct device *dev = &pdev->dev;
  86         struct sdhci_host *host = NULL;
  87         struct resource *iomem = NULL;
  88         struct sdhci_pxa *pxa = NULL;
  89         int ret, irq;
  90
  91         irq = platform_get_irq(pdev, 0);
  92         if (irq < 0) {
  93                 dev_err(dev, "no irq specified\n");
  94                 return irq;
  95         }
  96
  97         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  98         if (!iomem) {
  99                 dev_err(dev, "no memory specified\n");
 100                 return -ENOENT;
 101         }
 102
 103         host = sdhci_alloc_host(&pdev->dev, sizeof(struct sdhci_pxa));
 104         if (IS_ERR(host)) {
 105                 dev_err(dev, "failed to alloc host\n");
 106                 return PTR_ERR(host);
 107         }
 108
 109         pxa = sdhci_priv(host);
 110         pxa->host = host;
 111         pxa->pdata = pdata;
 112         pxa->clk_enable = 0;
 113
 114         pxa->clk = clk_get(dev, "PXA-SDHCLK");
 115         if (IS_ERR(pxa->clk)) {
 116                 dev_err(dev, "failed to get io clock\n");
 117                 ret = PTR_ERR(pxa->clk);
 118                 goto out;
 119         }
 120
 121         pxa->res = request_mem_region(iomem->start, resource_size(iomem),
 122                                       mmc_hostname(host->mmc));
 123         if (!pxa->res) {
 124                 dev_err(&pdev->dev, "cannot request region\n");
 125                 ret = -EBUSY;
 126                 goto out;
 127         }
 128
 129         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 130         if (!host->ioaddr) {
 131                 dev_err(&pdev->dev, "failed to remap registers\n");
 132                 ret = -ENOMEM;
 133                 goto out;
 134         }
 135
 136         host->hw_name = "MMC";
 137         host->ops = &sdhci_pxa_ops;
 138         host->irq = irq;
 139         host->quirks = SDHCI_QUIRK_BROKEN_ADMA | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
 140
 141         if (pdata->quirks)
 142                 host->quirks |= pdata->quirks;
 143
 144         ret = sdhci_add_host(host);
 145         if (ret) {
 146                 dev_err(&pdev->dev, "failed to add host\n");
 147                 goto out;
 148         }
 149
 150         if (pxa->pdata->max_speed)
 151                 host->mmc->f_max = pxa->pdata->max_speed;
 152
 153         platform_set_drvdata(pdev, host);
 154
 155         return 0;
 156 out:
 157         if (host) {
 158                 clk_put(pxa->clk);
 159                 if (host->ioaddr)
 160                         iounmap(host->ioaddr);
 161                 if (pxa->res)
 162                         release_mem_region(pxa->res->start,
 163                                            resource_size(pxa->res));
 164                 sdhci_free_host(host);
 165         }
 166
 167         return ret;
 168 }
 169
 170 static int __devexit sdhci_pxa_remove(struct platform_device *pdev)
 171 {
 172         struct sdhci_host *host = platform_get_drvdata(pdev);
 173         struct sdhci_pxa *pxa = sdhci_priv(host);
 174         int dead = 0;
 175         u32 scratch;
 176
 177         if (host) {
 178                 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
 179                 if (scratch == (u32)-1)
 180                         dead = 1;
 181
 182                 sdhci_remove_host(host, dead);
 183
 184                 if (host->ioaddr)
 185                         iounmap(host->ioaddr);
 186                 if (pxa->res)
 187                         release_mem_region(pxa->res->start,
 188                                            resource_size(pxa->res));
 189                 if (pxa->clk_enable) {
 190                         clk_disable(pxa->clk);
 191                         pxa->clk_enable = 0;
 192                 }
 193                 clk_put(pxa->clk);
 194
 195                 sdhci_free_host(host);
 196                 platform_set_drvdata(pdev, NULL);
 197         }
 198
 199         return 0;
 200 }
 201
 202 #ifdef CONFIG_PM
 203 static int sdhci_pxa_suspend(struct platform_device *dev, pm_message_t state)
 204 {
 205         struct sdhci_host *host = platform_get_drvdata(dev);
 206
 207         return sdhci_suspend_host(host, state);
 208 }
 209
 210 static int sdhci_pxa_resume(struct platform_device *dev)
 211 {
 212         struct sdhci_host *host = platform_get_drvdata(dev);
 213
 214         return sdhci_resume_host(host);
 215 }
 216 #else
 217 #define sdhci_pxa_suspend       NULL
 218 #define sdhci_pxa_resume        NULL
 219 #endif
 220
 221 static struct platform_driver sdhci_pxa_driver = {
 222         .probe          = sdhci_pxa_probe,
 223         .remove         = __devexit_p(sdhci_pxa_remove),
 224         .suspend        = sdhci_pxa_suspend,
 225         .resume         = sdhci_pxa_resume,
 226         .driver         = {
 227                 .name   = DRIVER_NAME,
 228                 .owner  = THIS_MODULE,
 229         },
 230 };
 231
 232 /*****************************************************************************\
 233  *                                                                           *
 234  * Driver init/exit                                                          *
 235  *                                                                           *
 236 \*****************************************************************************/
 237
 238 static int __init sdhci_pxa_init(void)
 239 {
 240         return platform_driver_register(&sdhci_pxa_driver);
 241 }
 242
 243 static void __exit sdhci_pxa_exit(void)
 244 {
 245         platform_driver_unregister(&sdhci_pxa_driver);
 246 }
 247
 248 module_init(sdhci_pxa_init);
 249 module_exit(sdhci_pxa_exit);
 250
 251 MODULE_DESCRIPTION("SDH controller driver for PXA168/PXA910/MMP2");
 252 MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>");
 253 MODULE_LICENSE("GPL v2");