Merge branch 'pm-runtime'
[cascardo/linux.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/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                 .pm     = SDHCI_PLTFM_PMOPS,
150                 .of_match_table = sdhci_dove_of_match_table,
151         },
152         .probe          = sdhci_dove_probe,
153         .remove         = sdhci_dove_remove,
154 };
155
156 module_platform_driver(sdhci_dove_driver);
157
158 MODULE_DESCRIPTION("SDHCI driver for Dove");
159 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
160               "Mike Rapoport <mike@compulab.co.il>");
161 MODULE_LICENSE("GPL v2");