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[~shefty/rdma-dev.git] / 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/err.h>
23 #include <linux/io.h>
24 #include <linux/clk.h>
25 #include <linux/err.h>
26 #include <linux/module.h>
27 #include <linux/mmc/host.h>
28 #include <linux/of.h>
29
30 #include "sdhci-pltfm.h"
31
32 struct sdhci_dove_priv {
33         struct clk *clk;
34 };
35
36 static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
37 {
38         u16 ret;
39
40         switch (reg) {
41         case SDHCI_HOST_VERSION:
42         case SDHCI_SLOT_INT_STATUS:
43                 /* those registers don't exist */
44                 return 0;
45         default:
46                 ret = readw(host->ioaddr + reg);
47         }
48         return ret;
49 }
50
51 static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
52 {
53         u32 ret;
54
55         switch (reg) {
56         case SDHCI_CAPABILITIES:
57                 ret = readl(host->ioaddr + reg);
58                 /* Mask the support for 3.0V */
59                 ret &= ~SDHCI_CAN_VDD_300;
60                 break;
61         default:
62                 ret = readl(host->ioaddr + reg);
63         }
64         return ret;
65 }
66
67 static struct sdhci_ops sdhci_dove_ops = {
68         .read_w = sdhci_dove_readw,
69         .read_l = sdhci_dove_readl,
70 };
71
72 static struct sdhci_pltfm_data sdhci_dove_pdata = {
73         .ops    = &sdhci_dove_ops,
74         .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
75                   SDHCI_QUIRK_NO_BUSY_IRQ |
76                   SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
77                   SDHCI_QUIRK_FORCE_DMA |
78                   SDHCI_QUIRK_NO_HISPD_BIT,
79 };
80
81 static int __devinit sdhci_dove_probe(struct platform_device *pdev)
82 {
83         struct sdhci_host *host;
84         struct sdhci_pltfm_host *pltfm_host;
85         struct sdhci_dove_priv *priv;
86         int ret;
87
88         priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv),
89                             GFP_KERNEL);
90         if (!priv) {
91                 dev_err(&pdev->dev, "unable to allocate private data");
92                 return -ENOMEM;
93         }
94
95         priv->clk = clk_get(&pdev->dev, NULL);
96         if (!IS_ERR(priv->clk))
97                 clk_prepare_enable(priv->clk);
98
99         ret = sdhci_pltfm_register(pdev, &sdhci_dove_pdata);
100         if (ret)
101                 goto sdhci_dove_register_fail;
102
103         host = platform_get_drvdata(pdev);
104         pltfm_host = sdhci_priv(host);
105         pltfm_host->priv = priv;
106
107         return 0;
108
109 sdhci_dove_register_fail:
110         if (!IS_ERR(priv->clk)) {
111                 clk_disable_unprepare(priv->clk);
112                 clk_put(priv->clk);
113         }
114         return ret;
115 }
116
117 static int __devexit sdhci_dove_remove(struct platform_device *pdev)
118 {
119         struct sdhci_host *host = platform_get_drvdata(pdev);
120         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
121         struct sdhci_dove_priv *priv = pltfm_host->priv;
122
123         sdhci_pltfm_unregister(pdev);
124
125         if (!IS_ERR(priv->clk)) {
126                 clk_disable_unprepare(priv->clk);
127                 clk_put(priv->clk);
128         }
129         return 0;
130 }
131
132 static const struct of_device_id sdhci_dove_of_match_table[] __devinitdata = {
133         { .compatible = "marvell,dove-sdhci", },
134         {}
135 };
136 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);
137
138 static struct platform_driver sdhci_dove_driver = {
139         .driver         = {
140                 .name   = "sdhci-dove",
141                 .owner  = THIS_MODULE,
142                 .pm     = SDHCI_PLTFM_PMOPS,
143                 .of_match_table = of_match_ptr(sdhci_dove_of_match_table),
144         },
145         .probe          = sdhci_dove_probe,
146         .remove         = __devexit_p(sdhci_dove_remove),
147 };
148
149 module_platform_driver(sdhci_dove_driver);
150
151 MODULE_DESCRIPTION("SDHCI driver for Dove");
152 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
153               "Mike Rapoport <mike@compulab.co.il>");
154 MODULE_LICENSE("GPL v2");