Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[sfrench/cifs-2.6.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 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");