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/err.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/io.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/delay.h>
  22 #include <linux/of.h>
  23 #include <linux/of_platform.h>
  24 #include <linux/of_address.h>
  25 #include <linux/of_irq.h>
  26 #include <linux/mmc/host.h>
  27 #ifdef CONFIG_PPC
  28 #include <asm/machdep.h>
  29 #endif
  30 #include "sdhci-of.h"
  31 #include "sdhci.h"
  32
  33 #ifdef CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
  34
  35 /*
  36  * These accessors are designed for big endian hosts doing I/O to
  37  * little endian controllers incorporating a 32-bit hardware byte swapper.
  38  */
  39
  40 u32 sdhci_be32bs_readl(struct sdhci_host *host, int reg)
  41 {
  42         return in_be32(host->ioaddr + reg);
  43 }
  44
  45 u16 sdhci_be32bs_readw(struct sdhci_host *host, int reg)
  46 {
  47         return in_be16(host->ioaddr + (reg ^ 0x2));
  48 }
  49
  50 u8 sdhci_be32bs_readb(struct sdhci_host *host, int reg)
  51 {
  52         return in_8(host->ioaddr + (reg ^ 0x3));
  53 }
  54
  55 void sdhci_be32bs_writel(struct sdhci_host *host, u32 val, int reg)
  56 {
  57         out_be32(host->ioaddr + reg, val);
  58 }
  59
  60 void sdhci_be32bs_writew(struct sdhci_host *host, u16 val, int reg)
  61 {
  62         struct sdhci_of_host *of_host = sdhci_priv(host);
  63         int base = reg & ~0x3;
  64         int shift = (reg & 0x2) * 8;
  65
  66         switch (reg) {
  67         case SDHCI_TRANSFER_MODE:
  68                 /*
  69                  * Postpone this write, we must do it together with a
  70                  * command write that is down below.
  71                  */
  72                 of_host->xfer_mode_shadow = val;
  73                 return;
  74         case SDHCI_COMMAND:
  75                 sdhci_be32bs_writel(host, val << 16 | of_host->xfer_mode_shadow,
  76                                     SDHCI_TRANSFER_MODE);
  77                 return;
  78         }
  79         clrsetbits_be32(host->ioaddr + base, 0xffff << shift, val << shift);
  80 }
  81
  82 void sdhci_be32bs_writeb(struct sdhci_host *host, u8 val, int reg)
  83 {
  84         int base = reg & ~0x3;
  85         int shift = (reg & 0x3) * 8;
  86
  87         clrsetbits_be32(host->ioaddr + base , 0xff << shift, val << shift);
  88 }
  89 #endif /* CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER */
  90
  91 #ifdef CONFIG_PM
  92
  93 static int sdhci_of_suspend(struct platform_device *ofdev, pm_message_t state)
  94 {
  95         struct sdhci_host *host = dev_get_drvdata(&ofdev->dev);
  96
  97         return mmc_suspend_host(host->mmc);
  98 }
  99
 100 static int sdhci_of_resume(struct platform_device *ofdev)
 101 {
 102         struct sdhci_host *host = dev_get_drvdata(&ofdev->dev);
 103
 104         return mmc_resume_host(host->mmc);
 105 }
 106
 107 #else
 108
 109 #define sdhci_of_suspend NULL
 110 #define sdhci_of_resume NULL
 111
 112 #endif
 113
 114 static bool __devinit sdhci_of_wp_inverted(struct device_node *np)
 115 {
 116         if (of_get_property(np, "sdhci,wp-inverted", NULL))
 117                 return true;
 118
 119         /* Old device trees don't have the wp-inverted property. */
 120 #ifdef CONFIG_PPC
 121         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
 122 #else
 123         return false;
 124 #endif
 125 }
 126
 127 static const struct of_device_id sdhci_of_match[];
 128 static int __devinit sdhci_of_probe(struct platform_device *ofdev)
 129 {
 130         const struct of_device_id *match;
 131         struct device_node *np = ofdev->dev.of_node;
 132         struct sdhci_of_data *sdhci_of_data;
 133         struct sdhci_host *host;
 134         struct sdhci_of_host *of_host;
 135         const __be32 *clk;
 136         int size;
 137         int ret;
 138
 139         match = of_match_device(sdhci_of_match, &ofdev->dev);
 140         if (!match)
 141                 return -EINVAL;
 142         sdhci_of_data = match->data;
 143
 144         if (!of_device_is_available(np))
 145                 return -ENODEV;
 146
 147         host = sdhci_alloc_host(&ofdev->dev, sizeof(*of_host));
 148         if (IS_ERR(host))
 149                 return -ENOMEM;
 150
 151         of_host = sdhci_priv(host);
 152         dev_set_drvdata(&ofdev->dev, host);
 153
 154         host->ioaddr = of_iomap(np, 0);
 155         if (!host->ioaddr) {
 156                 ret = -ENOMEM;
 157                 goto err_addr_map;
 158         }
 159
 160         host->irq = irq_of_parse_and_map(np, 0);
 161         if (!host->irq) {
 162                 ret = -EINVAL;
 163                 goto err_no_irq;
 164         }
 165
 166         host->hw_name = dev_name(&ofdev->dev);
 167         if (sdhci_of_data) {
 168                 host->quirks = sdhci_of_data->quirks;
 169                 host->ops = &sdhci_of_data->ops;
 170         }
 171
 172         if (of_get_property(np, "sdhci,auto-cmd12", NULL))
 173                 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
 174
 175
 176         if (of_get_property(np, "sdhci,1-bit-only", NULL))
 177                 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
 178
 179         if (sdhci_of_wp_inverted(np))
 180                 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
 181
 182         clk = of_get_property(np, "clock-frequency", &size);
 183         if (clk && size == sizeof(*clk) && *clk)
 184                 of_host->clock = be32_to_cpup(clk);
 185
 186         ret = sdhci_add_host(host);
 187         if (ret)
 188                 goto err_add_host;
 189
 190         return 0;
 191
 192 err_add_host:
 193         irq_dispose_mapping(host->irq);
 194 err_no_irq:
 195         iounmap(host->ioaddr);
 196 err_addr_map:
 197         sdhci_free_host(host);
 198         return ret;
 199 }
 200
 201 static int __devexit sdhci_of_remove(struct platform_device *ofdev)
 202 {
 203         struct sdhci_host *host = dev_get_drvdata(&ofdev->dev);
 204
 205         sdhci_remove_host(host, 0);
 206         sdhci_free_host(host);
 207         irq_dispose_mapping(host->irq);
 208         iounmap(host->ioaddr);
 209         return 0;
 210 }
 211
 212 static const struct of_device_id sdhci_of_match[] = {
 213 #ifdef CONFIG_MMC_SDHCI_OF_ESDHC
 214         { .compatible = "fsl,mpc8379-esdhc", .data = &sdhci_esdhc, },
 215         { .compatible = "fsl,mpc8536-esdhc", .data = &sdhci_esdhc, },
 216         { .compatible = "fsl,esdhc", .data = &sdhci_esdhc, },
 217 #endif
 218 #ifdef CONFIG_MMC_SDHCI_OF_HLWD
 219         { .compatible = "nintendo,hollywood-sdhci", .data = &sdhci_hlwd, },
 220 #endif
 221         { .compatible = "generic-sdhci", },
 222         {},
 223 };
 224 MODULE_DEVICE_TABLE(of, sdhci_of_match);
 225
 226 static struct platform_driver sdhci_of_driver = {
 227         .driver = {
 228                 .name = "sdhci-of",
 229                 .owner = THIS_MODULE,
 230                 .of_match_table = sdhci_of_match,
 231         },
 232         .probe = sdhci_of_probe,
 233         .remove = __devexit_p(sdhci_of_remove),
 234         .suspend = sdhci_of_suspend,
 235         .resume = sdhci_of_resume,
 236 };
 237
 238 static int __init sdhci_of_init(void)
 239 {
 240         return platform_driver_register(&sdhci_of_driver);
 241 }
 242 module_init(sdhci_of_init);
 243
 244 static void __exit sdhci_of_exit(void)
 245 {
 246         platform_driver_unregister(&sdhci_of_driver);
 247 }
 248 module_exit(sdhci_of_exit);
 249
 250 MODULE_DESCRIPTION("Secure Digital Host Controller Interface OF driver");
 251 MODULE_AUTHOR("Xiaobo Xie <X.Xie@freescale.com>, "
 252               "Anton Vorontsov <avorontsov@ru.mvista.com>");
 253 MODULE_LICENSE("GPL");