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
  31 static 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
  46 static 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
  61 static 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
  70 static 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
  79 static 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
 105 err_sdhci_add:
 106         clk_disable_unprepare(pltfm_host->clk);
 107         sdhci_pltfm_free(pdev);
 108         return ret;
 109 }
 110
 111 static const struct of_device_id sdhci_dove_of_match_table[] = {
 112         { .compatible = "marvell,dove-sdhci", },
 113         {}
 114 };
 115 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);
 116
 117 static 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
 127 module_platform_driver(sdhci_dove_driver);
 128
 129 MODULE_DESCRIPTION("SDHCI driver for Dove");
 130 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
 131               "Mike Rapoport <mike@compulab.co.il>");
 132 MODULE_LICENSE("GPL v2");