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         /* If slot design supports 8 bit data, indicate this to MMC. */
 145         if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
 146                 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
 147
 148         ret = sdhci_add_host(host);
 149         if (ret) {
 150                 dev_err(&pdev->dev, "failed to add host\n");
 151                 goto out;
 152         }
 153
 154         if (pxa->pdata->max_speed)
 155                 host->mmc->f_max = pxa->pdata->max_speed;
 156
 157         platform_set_drvdata(pdev, host);
 158
 159         return 0;
 160 out:
 161         if (host) {
 162                 clk_put(pxa->clk);
 163                 if (host->ioaddr)
 164                         iounmap(host->ioaddr);
 165                 if (pxa->res)
 166                         release_mem_region(pxa->res->start,
 167                                            resource_size(pxa->res));
 168                 sdhci_free_host(host);
 169         }
 170
 171         return ret;
 172 }
 173
 174 static int __devexit sdhci_pxa_remove(struct platform_device *pdev)
 175 {
 176         struct sdhci_host *host = platform_get_drvdata(pdev);
 177         struct sdhci_pxa *pxa = sdhci_priv(host);
 178         int dead = 0;
 179         u32 scratch;
 180
 181         if (host) {
 182                 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
 183                 if (scratch == (u32)-1)
 184                         dead = 1;
 185
 186                 sdhci_remove_host(host, dead);
 187
 188                 if (host->ioaddr)
 189                         iounmap(host->ioaddr);
 190                 if (pxa->res)
 191                         release_mem_region(pxa->res->start,
 192                                            resource_size(pxa->res));
 193                 if (pxa->clk_enable) {
 194                         clk_disable(pxa->clk);
 195                         pxa->clk_enable = 0;
 196                 }
 197                 clk_put(pxa->clk);
 198
 199                 sdhci_free_host(host);
 200                 platform_set_drvdata(pdev, NULL);
 201         }
 202
 203         return 0;
 204 }
 205
 206 #ifdef CONFIG_PM
 207 static int sdhci_pxa_suspend(struct platform_device *dev, pm_message_t state)
 208 {
 209         struct sdhci_host *host = platform_get_drvdata(dev);
 210
 211         return sdhci_suspend_host(host, state);
 212 }
 213
 214 static int sdhci_pxa_resume(struct platform_device *dev)
 215 {
 216         struct sdhci_host *host = platform_get_drvdata(dev);
 217
 218         return sdhci_resume_host(host);
 219 }
 220 #else
 221 #define sdhci_pxa_suspend       NULL
 222 #define sdhci_pxa_resume        NULL
 223 #endif
 224
 225 static struct platform_driver sdhci_pxa_driver = {
 226         .probe          = sdhci_pxa_probe,
 227         .remove         = __devexit_p(sdhci_pxa_remove),
 228         .suspend        = sdhci_pxa_suspend,
 229         .resume         = sdhci_pxa_resume,
 230         .driver         = {
 231                 .name   = DRIVER_NAME,
 232                 .owner  = THIS_MODULE,
 233         },
 234 };
 235
 236 /*****************************************************************************\
 237  *                                                                           *
 238  * Driver init/exit                                                          *
 239  *                                                                           *
 240 \*****************************************************************************/
 241
 242 static int __init sdhci_pxa_init(void)
 243 {
 244         return platform_driver_register(&sdhci_pxa_driver);
 245 }
 246
 247 static void __exit sdhci_pxa_exit(void)
 248 {
 249         platform_driver_unregister(&sdhci_pxa_driver);
 250 }
 251
 252 module_init(sdhci_pxa_init);
 253 module_exit(sdhci_pxa_exit);
 254
 255 MODULE_DESCRIPTION("SDH controller driver for PXA168/PXA910/MMP2");
 256 MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>");
 257 MODULE_LICENSE("GPL v2");