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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 
 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");
133 

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