LXR linux/drivers/mmc/host/sdhci-dove.c

   1/*
   2 * sdhci-dove.c Support for SDHCI on Marvell's Dove SoC
   3 *
   4 * Author: Saeed Bishara <saeed@marvell.com>
   5 *         Mike Rapoport <mike@compulab.co.il>
   6 * Based on sdhci-cns3xxx.c
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22#include <linux/clk.h>
  23#include <linux/err.h>
  24#include <linux/io.h>
  25#include <linux/mmc/host.h>
  26#include <linux/module.h>
  27#include <linux/of.h>
  28
  29#include "sdhci-pltfm.h"
  30
  31static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
  32{
  33        u16 ret;
  34
  35        switch (reg) {
  36        case SDHCI_HOST_VERSION:
  37        case SDHCI_SLOT_INT_STATUS:
  38                /* those registers don't exist */
  39                return 0;
  40        default:
  41                ret = readw(host->ioaddr + reg);
  42        }
  43        return ret;
  44}
  45
  46static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
  47{
  48        u32 ret;
  49
  50        ret = readl(host->ioaddr + reg);
  51
  52        switch (reg) {
  53        case SDHCI_CAPABILITIES:
  54                /* Mask the support for 3.0V */
  55                ret &= ~SDHCI_CAN_VDD_300;
  56                break;
  57        }
  58        return ret;
  59}
  60
  61static const struct sdhci_ops sdhci_dove_ops = {
  62        .read_w = sdhci_dove_readw,
  63        .read_l = sdhci_dove_readl,
  64        .set_clock = sdhci_set_clock,
  65        .set_bus_width = sdhci_set_bus_width,
  66        .reset = sdhci_reset,
  67        .set_uhs_signaling = sdhci_set_uhs_signaling,
  68};
  69
  70static const struct sdhci_pltfm_data sdhci_dove_pdata = {
  71        .ops    = &sdhci_dove_ops,
  72        .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
  73                  SDHCI_QUIRK_NO_BUSY_IRQ |
  74                  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
  75                  SDHCI_QUIRK_FORCE_DMA |
  76                  SDHCI_QUIRK_NO_HISPD_BIT,
  77};
  78
  79static int sdhci_dove_probe(struct platform_device *pdev)
  80{
  81        struct sdhci_host *host;
  82        struct sdhci_pltfm_host *pltfm_host;
  83        int ret;
  84
  85        host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0);
  86        if (IS_ERR(host))
  87                return PTR_ERR(host);
  88
  89        pltfm_host = sdhci_priv(host);
  90        pltfm_host->clk = devm_clk_get(&pdev->dev, NULL);
  91
  92        if (!IS_ERR(pltfm_host->clk))
  93                clk_prepare_enable(pltfm_host->clk);
  94
  95        ret = mmc_of_parse(host->mmc);
  96        if (ret)
  97                goto err_sdhci_add;
  98
  99        ret = sdhci_add_host(host);
 100        if (ret)
 101                goto err_sdhci_add;
 102
 103        return 0;
 104
 105err_sdhci_add:
 106        clk_disable_unprepare(pltfm_host->clk);
 107        sdhci_pltfm_free(pdev);
 108        return ret;
 109}
 110
 111static const struct of_device_id sdhci_dove_of_match_table[] = {
 112        { .compatible = "marvell,dove-sdhci", },
 113        {}
 114};
 115MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);
 116
 117static struct platform_driver sdhci_dove_driver = {
 118        .driver         = {
 119                .name   = "sdhci-dove",
 120                .pm     = &sdhci_pltfm_pmops,
 121                .of_match_table = sdhci_dove_of_match_table,
 122        },
 123        .probe          = sdhci_dove_probe,
 124        .remove         = sdhci_pltfm_unregister,
 125};
 126
 127module_platform_driver(sdhci_dove_driver);
 128
 129MODULE_DESCRIPTION("SDHCI driver for Dove");
 130MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
 131              "Mike Rapoport <mike@compulab.co.il>");
 132MODULE_LICENSE("GPL v2");
 133