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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * drivers/mmc/host/sdhci-of-hlwd.c
   4  *
   5  * Nintendo Wii Secure Digital Host Controller Interface.
   6  * Copyright (C) 2009 The GameCube Linux Team
   7  * Copyright (C) 2009 Albert Herranz
   8  *
   9  * Based on sdhci-of-esdhc.c
  10  *
  11  * Copyright (c) 2007 Freescale Semiconductor, Inc.
  12  * Copyright (c) 2009 MontaVista Software, Inc.
  13  *
  14  * Authors: Xiaobo Xie <X.Xie@freescale.com>
  15  *          Anton Vorontsov <avorontsov@ru.mvista.com>
  16  */
  17
  18 #include <linux/delay.h>
  19 #include <linux/module.h>
  20 #include <linux/mmc/host.h>
  21 #include "sdhci-pltfm.h"
  22
  23 /*
  24  * Ops and quirks for the Nintendo Wii SDHCI controllers.
  25  */
  26
  27 /*
  28  * We need a small delay after each write, or things go horribly wrong.
  29  */
  30 #define SDHCI_HLWD_WRITE_DELAY  5 /* usecs */
  31
  32 static void sdhci_hlwd_writel(struct sdhci_host *host, u32 val, int reg)
  33 {
  34         sdhci_be32bs_writel(host, val, reg);
  35         udelay(SDHCI_HLWD_WRITE_DELAY);
  36 }
  37
  38 static void sdhci_hlwd_writew(struct sdhci_host *host, u16 val, int reg)
  39 {
  40         sdhci_be32bs_writew(host, val, reg);
  41         udelay(SDHCI_HLWD_WRITE_DELAY);
  42 }
  43
  44 static void sdhci_hlwd_writeb(struct sdhci_host *host, u8 val, int reg)
  45 {
  46         sdhci_be32bs_writeb(host, val, reg);
  47         udelay(SDHCI_HLWD_WRITE_DELAY);
  48 }
  49
  50 static const struct sdhci_ops sdhci_hlwd_ops = {
  51         .read_l = sdhci_be32bs_readl,
  52         .read_w = sdhci_be32bs_readw,
  53         .read_b = sdhci_be32bs_readb,
  54         .write_l = sdhci_hlwd_writel,
  55         .write_w = sdhci_hlwd_writew,
  56         .write_b = sdhci_hlwd_writeb,
  57         .set_clock = sdhci_set_clock,
  58         .set_bus_width = sdhci_set_bus_width,
  59         .reset = sdhci_reset,
  60         .set_uhs_signaling = sdhci_set_uhs_signaling,
  61 };
  62
  63 static const struct sdhci_pltfm_data sdhci_hlwd_pdata = {
  64         .quirks = SDHCI_QUIRK_32BIT_DMA_ADDR |
  65                   SDHCI_QUIRK_32BIT_DMA_SIZE,
  66         .ops = &sdhci_hlwd_ops,
  67 };
  68
  69 static int sdhci_hlwd_probe(struct platform_device *pdev)
  70 {
  71         return sdhci_pltfm_register(pdev, &sdhci_hlwd_pdata, 0);
  72 }
  73
  74 static const struct of_device_id sdhci_hlwd_of_match[] = {
  75         { .compatible = "nintendo,hollywood-sdhci" },
  76         { }
  77 };
  78 MODULE_DEVICE_TABLE(of, sdhci_hlwd_of_match);
  79
  80 static struct platform_driver sdhci_hlwd_driver = {
  81         .driver = {
  82                 .name = "sdhci-hlwd",
  83                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
  84                 .of_match_table = sdhci_hlwd_of_match,
  85                 .pm = &sdhci_pltfm_pmops,
  86         },
  87         .probe = sdhci_hlwd_probe,
  88         .remove = sdhci_pltfm_unregister,
  89 };
  90
  91 module_platform_driver(sdhci_hlwd_driver);
  92
  93 MODULE_DESCRIPTION("Nintendo Wii SDHCI OF driver");
  94 MODULE_AUTHOR("The GameCube Linux Team, Albert Herranz");
  95 MODULE_LICENSE("GPL v2");