kernel/drivers/mmc/host/sdhci-of-hlwd.c

   1 /*
   2  * drivers/mmc/host/sdhci-of-hlwd.c
   3  *
   4  * Nintendo Wii Secure Digital Host Controller Interface.
   5  * Copyright (C) 2009 The GameCube Linux Team
   6  * Copyright (C) 2009 Albert Herranz
   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/delay.h>
  23 #include <linux/module.h>
  24 #include <linux/mmc/host.h>
  25 #include "sdhci-pltfm.h"
  26
  27 /*
  28  * Ops and quirks for the Nintendo Wii SDHCI controllers.
  29  */
  30
  31 /*
  32  * We need a small delay after each write, or things go horribly wrong.
  33  */
  34 #define SDHCI_HLWD_WRITE_DELAY  5 /* usecs */
  35
  36 static void sdhci_hlwd_writel(struct sdhci_host *host, u32 val, int reg)
  37 {
  38         sdhci_be32bs_writel(host, val, reg);
  39         udelay(SDHCI_HLWD_WRITE_DELAY);
  40 }
  41
  42 static void sdhci_hlwd_writew(struct sdhci_host *host, u16 val, int reg)
  43 {
  44         sdhci_be32bs_writew(host, val, reg);
  45         udelay(SDHCI_HLWD_WRITE_DELAY);
  46 }
  47
  48 static void sdhci_hlwd_writeb(struct sdhci_host *host, u8 val, int reg)
  49 {
  50         sdhci_be32bs_writeb(host, val, reg);
  51         udelay(SDHCI_HLWD_WRITE_DELAY);
  52 }
  53
  54 static const struct sdhci_ops sdhci_hlwd_ops = {
  55         .read_l = sdhci_be32bs_readl,
  56         .read_w = sdhci_be32bs_readw,
  57         .read_b = sdhci_be32bs_readb,
  58         .write_l = sdhci_hlwd_writel,
  59         .write_w = sdhci_hlwd_writew,
  60         .write_b = sdhci_hlwd_writeb,
  61         .set_clock = sdhci_set_clock,
  62         .set_bus_width = sdhci_set_bus_width,
  63         .reset = sdhci_reset,
  64         .set_uhs_signaling = sdhci_set_uhs_signaling,
  65 };
  66
  67 static const struct sdhci_pltfm_data sdhci_hlwd_pdata = {
  68         .quirks = SDHCI_QUIRK_32BIT_DMA_ADDR |
  69                   SDHCI_QUIRK_32BIT_DMA_SIZE,
  70         .ops = &sdhci_hlwd_ops,
  71 };
  72
  73 static int sdhci_hlwd_probe(struct platform_device *pdev)
  74 {
  75         return sdhci_pltfm_register(pdev, &sdhci_hlwd_pdata, 0);
  76 }
  77
  78 static const struct of_device_id sdhci_hlwd_of_match[] = {
  79         { .compatible = "nintendo,hollywood-sdhci" },
  80         { }
  81 };
  82 MODULE_DEVICE_TABLE(of, sdhci_hlwd_of_match);
  83
  84 static struct platform_driver sdhci_hlwd_driver = {
  85         .driver = {
  86                 .name = "sdhci-hlwd",
  87                 .of_match_table = sdhci_hlwd_of_match,
  88                 .pm = SDHCI_PLTFM_PMOPS,
  89         },
  90         .probe = sdhci_hlwd_probe,
  91         .remove = sdhci_pltfm_unregister,
  92 };
  93
  94 module_platform_driver(sdhci_hlwd_driver);
  95
  96 MODULE_DESCRIPTION("Nintendo Wii SDHCI OF driver");
  97 MODULE_AUTHOR("The GameCube Linux Team, Albert Herranz");
  98 MODULE_LICENSE("GPL v2");