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

   1 /*
   2  * Freescale eSDHC controller driver.
   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/io.h>
  17 #include <linux/delay.h>
  18 #include <linux/mmc/host.h>
  19 #include "sdhci-pltfm.h"
  20 #include "sdhci-esdhc.h"
  21
  22 static u16 esdhc_readw(struct sdhci_host *host, int reg)
  23 {
  24         u16 ret;
  25
  26         if (unlikely(reg == SDHCI_HOST_VERSION))
  27                 ret = in_be16(host->ioaddr + reg);
  28         else
  29                 ret = sdhci_be32bs_readw(host, reg);
  30         return ret;
  31 }
  32
  33 static void esdhc_writew(struct sdhci_host *host, u16 val, int reg)
  34 {
  35         if (reg == SDHCI_BLOCK_SIZE) {
  36                 /*
  37                  * Two last DMA bits are reserved, and first one is used for
  38                  * non-standard blksz of 4096 bytes that we don't support
  39                  * yet. So clear the DMA boundary bits.
  40                  */
  41                 val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
  42         }
  43         sdhci_be32bs_writew(host, val, reg);
  44 }
  45
  46 static void esdhc_writeb(struct sdhci_host *host, u8 val, int reg)
  47 {
  48         /* Prevent SDHCI core from writing reserved bits (e.g. HISPD). */
  49         if (reg == SDHCI_HOST_CONTROL)
  50                 val &= ~ESDHC_HOST_CONTROL_RES;
  51         sdhci_be32bs_writeb(host, val, reg);
  52 }
  53
  54 static int esdhc_of_enable_dma(struct sdhci_host *host)
  55 {
  56         setbits32(host->ioaddr + ESDHC_DMA_SYSCTL, ESDHC_DMA_SNOOP);
  57         return 0;
  58 }
  59
  60 static unsigned int esdhc_of_get_max_clock(struct sdhci_host *host)
  61 {
  62         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  63
  64         return pltfm_host->clock;
  65 }
  66
  67 static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host)
  68 {
  69         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  70
  71         return pltfm_host->clock / 256 / 16;
  72 }
  73
  74 static struct sdhci_ops sdhci_esdhc_ops = {
  75         .read_l = sdhci_be32bs_readl,
  76         .read_w = esdhc_readw,
  77         .read_b = sdhci_be32bs_readb,
  78         .write_l = sdhci_be32bs_writel,
  79         .write_w = esdhc_writew,
  80         .write_b = esdhc_writeb,
  81         .set_clock = esdhc_set_clock,
  82         .enable_dma = esdhc_of_enable_dma,
  83         .get_max_clock = esdhc_of_get_max_clock,
  84         .get_min_clock = esdhc_of_get_min_clock,
  85 };
  86
  87 static struct sdhci_pltfm_data sdhci_esdhc_pdata = {
  88         /* card detection could be handled via GPIO */
  89         .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_CARD_DETECTION
  90                 | SDHCI_QUIRK_NO_CARD_NO_RESET,
  91         .ops = &sdhci_esdhc_ops,
  92 };
  93
  94 static int __devinit sdhci_esdhc_probe(struct platform_device *pdev)
  95 {
  96         return sdhci_pltfm_register(pdev, &sdhci_esdhc_pdata);
  97 }
  98
  99 static int __devexit sdhci_esdhc_remove(struct platform_device *pdev)
 100 {
 101         return sdhci_pltfm_unregister(pdev);
 102 }
 103
 104 static const struct of_device_id sdhci_esdhc_of_match[] = {
 105         { .compatible = "fsl,mpc8379-esdhc" },
 106         { .compatible = "fsl,mpc8536-esdhc" },
 107         { .compatible = "fsl,esdhc" },
 108         { }
 109 };
 110 MODULE_DEVICE_TABLE(of, sdhci_esdhc_of_match);
 111
 112 static struct platform_driver sdhci_esdhc_driver = {
 113         .driver = {
 114                 .name = "sdhci-esdhc",
 115                 .owner = THIS_MODULE,
 116                 .of_match_table = sdhci_esdhc_of_match,
 117         },
 118         .probe = sdhci_esdhc_probe,
 119         .remove = __devexit_p(sdhci_esdhc_remove),
 120 #ifdef CONFIG_PM
 121         .suspend = sdhci_pltfm_suspend,
 122         .resume = sdhci_pltfm_resume,
 123 #endif
 124 };
 125
 126 static int __init sdhci_esdhc_init(void)
 127 {
 128         return platform_driver_register(&sdhci_esdhc_driver);
 129 }
 130 module_init(sdhci_esdhc_init);
 131
 132 static void __exit sdhci_esdhc_exit(void)
 133 {
 134         platform_driver_unregister(&sdhci_esdhc_driver);
 135 }
 136 module_exit(sdhci_esdhc_exit);
 137
 138 MODULE_DESCRIPTION("SDHCI OF driver for Freescale MPC eSDHC");
 139 MODULE_AUTHOR("Xiaobo Xie <X.Xie@freescale.com>, "
 140               "Anton Vorontsov <avorontsov@ru.mvista.com>");
 141 MODULE_LICENSE("GPL v2");