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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 struct sdhci_dove_priv {
 32         struct clk *clk;
 33 };
 34 
 35 static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
 36 {
 37         u16 ret;
 38 
 39         switch (reg) {
 40         case SDHCI_HOST_VERSION:
 41         case SDHCI_SLOT_INT_STATUS:
 42                 /* those registers don't exist */
 43                 return 0;
 44         default:
 45                 ret = readw(host->ioaddr + reg);
 46         }
 47         return ret;
 48 }
 49 
 50 static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
 51 {
 52         u32 ret;
 53 
 54         ret = readl(host->ioaddr + reg);
 55 
 56         switch (reg) {
 57         case SDHCI_CAPABILITIES:
 58                 /* Mask the support for 3.0V */
 59                 ret &= ~SDHCI_CAN_VDD_300;
 60                 break;
 61         }
 62         return ret;
 63 }
 64 
 65 static const struct sdhci_ops sdhci_dove_ops = {
 66         .read_w = sdhci_dove_readw,
 67         .read_l = sdhci_dove_readl,
 68         .set_clock = sdhci_set_clock,
 69         .set_bus_width = sdhci_set_bus_width,
 70         .reset = sdhci_reset,
 71         .set_uhs_signaling = sdhci_set_uhs_signaling,
 72 };
 73 
 74 static const struct sdhci_pltfm_data sdhci_dove_pdata = {
 75         .ops    = &sdhci_dove_ops,
 76         .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
 77                   SDHCI_QUIRK_NO_BUSY_IRQ |
 78                   SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
 79                   SDHCI_QUIRK_FORCE_DMA |
 80                   SDHCI_QUIRK_NO_HISPD_BIT,
 81 };
 82 
 83 static int sdhci_dove_probe(struct platform_device *pdev)
 84 {
 85         struct sdhci_host *host;
 86         struct sdhci_pltfm_host *pltfm_host;
 87         struct sdhci_dove_priv *priv;
 88         int ret;
 89 
 90         priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv),
 91                             GFP_KERNEL);
 92         if (!priv) {
 93                 dev_err(&pdev->dev, "unable to allocate private data");
 94                 return -ENOMEM;
 95         }
 96 
 97         priv->clk = devm_clk_get(&pdev->dev, NULL);
 98 
 99         host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0);
100         if (IS_ERR(host))
101                 return PTR_ERR(host);
102 
103         pltfm_host = sdhci_priv(host);
104         pltfm_host->priv = priv;
105 
106         if (!IS_ERR(priv->clk))
107                 clk_prepare_enable(priv->clk);
108 
109         ret = mmc_of_parse(host->mmc);
110         if (ret)
111                 goto err_sdhci_add;
112 
113         ret = sdhci_add_host(host);
114         if (ret)
115                 goto err_sdhci_add;
116 
117         return 0;
118 
119 err_sdhci_add:
120         if (!IS_ERR(priv->clk))
121                 clk_disable_unprepare(priv->clk);
122         sdhci_pltfm_free(pdev);
123         return ret;
124 }
125 
126 static int sdhci_dove_remove(struct platform_device *pdev)
127 {
128         struct sdhci_host *host = platform_get_drvdata(pdev);
129         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
130         struct sdhci_dove_priv *priv = pltfm_host->priv;
131 
132         sdhci_pltfm_unregister(pdev);
133 
134         if (!IS_ERR(priv->clk))
135                 clk_disable_unprepare(priv->clk);
136 
137         return 0;
138 }
139 
140 static const struct of_device_id sdhci_dove_of_match_table[] = {
141         { .compatible = "marvell,dove-sdhci", },
142         {}
143 };
144 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);
145 
146 static struct platform_driver sdhci_dove_driver = {
147         .driver         = {
148                 .name   = "sdhci-dove",
149                 .owner  = THIS_MODULE,
150                 .pm     = SDHCI_PLTFM_PMOPS,
151                 .of_match_table = sdhci_dove_of_match_table,
152         },
153         .probe          = sdhci_dove_probe,
154         .remove         = sdhci_dove_remove,
155 };
156 
157 module_platform_driver(sdhci_dove_driver);
158 
159 MODULE_DESCRIPTION("SDHCI driver for Dove");
160 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
161               "Mike Rapoport <mike@compulab.co.il>");
162 MODULE_LICENSE("GPL v2");
163 

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