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

   1 /*
   2  * OpenFirmware bindings for Secure Digital Host Controller Interface.
   3  *
   4  * Copyright (c) 2007 Freescale Semiconductor, Inc.
   5  * Copyright (c) 2009 MontaVista Software, Inc.
   6  *
   7  * Authors: Xiaobo Xie <X.Xie@freescale.com>
   8  *          Anton Vorontsov <avorontsov@ru.mvista.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 as published by
  12  * the Free Software Foundation; either version 2 of the License, or (at
  13  * your option) any later version.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/io.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/delay.h>
  21 #include <linux/of.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/mmc/host.h>
  24 #include <asm/machdep.h>
  25 #include "sdhci-of.h"
  26 #include "sdhci.h"
  27
  28 #ifdef CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
  29
  30 /*
  31  * These accessors are designed for big endian hosts doing I/O to
  32  * little endian controllers incorporating a 32-bit hardware byte swapper.
  33  */
  34
  35 u32 sdhci_be32bs_readl(struct sdhci_host *host, int reg)
  36 {
  37         return in_be32(host->ioaddr + reg);
  38 }
  39
  40 u16 sdhci_be32bs_readw(struct sdhci_host *host, int reg)
  41 {
  42         return in_be16(host->ioaddr + (reg ^ 0x2));
  43 }
  44
  45 u8 sdhci_be32bs_readb(struct sdhci_host *host, int reg)
  46 {
  47         return in_8(host->ioaddr + (reg ^ 0x3));
  48 }
  49
  50 void sdhci_be32bs_writel(struct sdhci_host *host, u32 val, int reg)
  51 {
  52         out_be32(host->ioaddr + reg, val);
  53 }
  54
  55 void sdhci_be32bs_writew(struct sdhci_host *host, u16 val, int reg)
  56 {
  57         struct sdhci_of_host *of_host = sdhci_priv(host);
  58         int base = reg & ~0x3;
  59         int shift = (reg & 0x2) * 8;
  60
  61         switch (reg) {
  62         case SDHCI_TRANSFER_MODE:
  63                 /*
  64                  * Postpone this write, we must do it together with a
  65                  * command write that is down below.
  66                  */
  67                 of_host->xfer_mode_shadow = val;
  68                 return;
  69         case SDHCI_COMMAND:
  70                 sdhci_be32bs_writel(host, val << 16 | of_host->xfer_mode_shadow,
  71                                     SDHCI_TRANSFER_MODE);
  72                 return;
  73         }
  74         clrsetbits_be32(host->ioaddr + base, 0xffff << shift, val << shift);
  75 }
  76
  77 void sdhci_be32bs_writeb(struct sdhci_host *host, u8 val, int reg)
  78 {
  79         int base = reg & ~0x3;
  80         int shift = (reg & 0x3) * 8;
  81
  82         clrsetbits_be32(host->ioaddr + base , 0xff << shift, val << shift);
  83 }
  84 #endif /* CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER */
  85
  86 #ifdef CONFIG_PM
  87
  88 static int sdhci_of_suspend(struct of_device *ofdev, pm_message_t state)
  89 {
  90         struct sdhci_host *host = dev_get_drvdata(&ofdev->dev);
  91
  92         return mmc_suspend_host(host->mmc);
  93 }
  94
  95 static int sdhci_of_resume(struct of_device *ofdev)
  96 {
  97         struct sdhci_host *host = dev_get_drvdata(&ofdev->dev);
  98
  99         return mmc_resume_host(host->mmc);
 100 }
 101
 102 #else
 103
 104 #define sdhci_of_suspend NULL
 105 #define sdhci_of_resume NULL
 106
 107 #endif
 108
 109 static bool __devinit sdhci_of_wp_inverted(struct device_node *np)
 110 {
 111         if (of_get_property(np, "sdhci,wp-inverted", NULL))
 112                 return true;
 113
 114         /* Old device trees don't have the wp-inverted property. */
 115         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
 116 }
 117
 118 static int __devinit sdhci_of_probe(struct of_device *ofdev,
 119                                  const struct of_device_id *match)
 120 {
 121         struct device_node *np = ofdev->dev.of_node;
 122         struct sdhci_of_data *sdhci_of_data = match->data;
 123         struct sdhci_host *host;
 124         struct sdhci_of_host *of_host;
 125         const u32 *clk;
 126         int size;
 127         int ret;
 128
 129         if (!of_device_is_available(np))
 130                 return -ENODEV;
 131
 132         host = sdhci_alloc_host(&ofdev->dev, sizeof(*of_host));
 133         if (IS_ERR(host))
 134                 return -ENOMEM;
 135
 136         of_host = sdhci_priv(host);
 137         dev_set_drvdata(&ofdev->dev, host);
 138
 139         host->ioaddr = of_iomap(np, 0);
 140         if (!host->ioaddr) {
 141                 ret = -ENOMEM;
 142                 goto err_addr_map;
 143         }
 144
 145         host->irq = irq_of_parse_and_map(np, 0);
 146         if (!host->irq) {
 147                 ret = -EINVAL;
 148                 goto err_no_irq;
 149         }
 150
 151         host->hw_name = dev_name(&ofdev->dev);
 152         if (sdhci_of_data) {
 153                 host->quirks = sdhci_of_data->quirks;
 154                 host->ops = &sdhci_of_data->ops;
 155         }
 156
 157         if (of_get_property(np, "sdhci,1-bit-only", NULL))
 158                 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
 159
 160         if (sdhci_of_wp_inverted(np))
 161                 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
 162
 163         clk = of_get_property(np, "clock-frequency", &size);
 164         if (clk && size == sizeof(*clk) && *clk)
 165                 of_host->clock = *clk;
 166
 167         ret = sdhci_add_host(host);
 168         if (ret)
 169                 goto err_add_host;
 170
 171         return 0;
 172
 173 err_add_host:
 174         irq_dispose_mapping(host->irq);
 175 err_no_irq:
 176         iounmap(host->ioaddr);
 177 err_addr_map:
 178         sdhci_free_host(host);
 179         return ret;
 180 }
 181
 182 static int __devexit sdhci_of_remove(struct of_device *ofdev)
 183 {
 184         struct sdhci_host *host = dev_get_drvdata(&ofdev->dev);
 185
 186         sdhci_remove_host(host, 0);
 187         sdhci_free_host(host);
 188         irq_dispose_mapping(host->irq);
 189         iounmap(host->ioaddr);
 190         return 0;
 191 }
 192
 193 static const struct of_device_id sdhci_of_match[] = {
 194 #ifdef CONFIG_MMC_SDHCI_OF_ESDHC
 195         { .compatible = "fsl,mpc8379-esdhc", .data = &sdhci_esdhc, },
 196         { .compatible = "fsl,mpc8536-esdhc", .data = &sdhci_esdhc, },
 197         { .compatible = "fsl,esdhc", .data = &sdhci_esdhc, },
 198 #endif
 199 #ifdef CONFIG_MMC_SDHCI_OF_HLWD
 200         { .compatible = "nintendo,hollywood-sdhci", .data = &sdhci_hlwd, },
 201 #endif
 202         { .compatible = "generic-sdhci", },
 203         {},
 204 };
 205 MODULE_DEVICE_TABLE(of, sdhci_of_match);
 206
 207 static struct of_platform_driver sdhci_of_driver = {
 208         .driver = {
 209                 .name = "sdhci-of",
 210                 .owner = THIS_MODULE,
 211                 .of_match_table = sdhci_of_match,
 212         },
 213         .probe = sdhci_of_probe,
 214         .remove = __devexit_p(sdhci_of_remove),
 215         .suspend = sdhci_of_suspend,
 216         .resume = sdhci_of_resume,
 217 };
 218
 219 static int __init sdhci_of_init(void)
 220 {
 221         return of_register_platform_driver(&sdhci_of_driver);
 222 }
 223 module_init(sdhci_of_init);
 224
 225 static void __exit sdhci_of_exit(void)
 226 {
 227         of_unregister_platform_driver(&sdhci_of_driver);
 228 }
 229 module_exit(sdhci_of_exit);
 230
 231 MODULE_DESCRIPTION("Secure Digital Host Controller Interface OF driver");
 232 MODULE_AUTHOR("Xiaobo Xie <X.Xie@freescale.com>, "
 233               "Anton Vorontsov <avorontsov@ru.mvista.com>");
 234 MODULE_LICENSE("GPL");