Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / mfd / sh_mobile_sdhi.c
1 /*
2  * SuperH Mobile SDHI
3  *
4  * Copyright (C) 2009 Magnus Damm
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  * Based on "Compaq ASIC3 support":
11  *
12  * Copyright 2001 Compaq Computer Corporation.
13  * Copyright 2004-2005 Phil Blundell
14  * Copyright 2007-2008 OpenedHand Ltd.
15  *
16  * Authors: Phil Blundell <pb@handhelds.org>,
17  *          Samuel Ortiz <sameo@openedhand.com>
18  *
19  */
20
21 #include <linux/kernel.h>
22 #include <linux/clk.h>
23 #include <linux/slab.h>
24 #include <linux/platform_device.h>
25 #include <linux/mmc/host.h>
26 #include <linux/mfd/core.h>
27 #include <linux/mfd/tmio.h>
28 #include <linux/mfd/sh_mobile_sdhi.h>
29
30 struct sh_mobile_sdhi {
31         struct clk *clk;
32         struct tmio_mmc_data mmc_data;
33         struct mfd_cell cell_mmc;
34 };
35
36 static struct resource sh_mobile_sdhi_resources[] = {
37         {
38                 .start = 0x000,
39                 .end   = 0x1ff,
40                 .flags = IORESOURCE_MEM,
41         },
42         {
43                 .start = 0,
44                 .end   = 0,
45                 .flags = IORESOURCE_IRQ,
46         },
47 };
48
49 static struct mfd_cell sh_mobile_sdhi_cell = {
50         .name          = "tmio-mmc",
51         .num_resources = ARRAY_SIZE(sh_mobile_sdhi_resources),
52         .resources     = sh_mobile_sdhi_resources,
53 };
54
55 static void sh_mobile_sdhi_set_pwr(struct platform_device *tmio, int state)
56 {
57         struct platform_device *pdev = to_platform_device(tmio->dev.parent);
58         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
59
60         if (p && p->set_pwr)
61                 p->set_pwr(pdev, state);
62 }
63
64 static int __init sh_mobile_sdhi_probe(struct platform_device *pdev)
65 {
66         struct sh_mobile_sdhi *priv;
67         struct resource *mem;
68         char clk_name[8];
69         int ret, irq;
70
71         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
72         if (!mem)
73                 dev_err(&pdev->dev, "missing MEM resource\n");
74
75         irq = platform_get_irq(pdev, 0);
76         if (irq < 0)
77                 dev_err(&pdev->dev, "missing IRQ resource\n");
78
79         if (!mem || (irq < 0))
80                 return -EINVAL;
81
82         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
83         if (priv == NULL) {
84                 dev_err(&pdev->dev, "kzalloc failed\n");
85                 return -ENOMEM;
86         }
87
88         snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
89         priv->clk = clk_get(&pdev->dev, clk_name);
90         if (IS_ERR(priv->clk)) {
91                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
92                 ret = PTR_ERR(priv->clk);
93                 kfree(priv);
94                 return ret;
95         }
96
97         clk_enable(priv->clk);
98
99         priv->mmc_data.hclk = clk_get_rate(priv->clk);
100         priv->mmc_data.set_pwr = sh_mobile_sdhi_set_pwr;
101         priv->mmc_data.capabilities = MMC_CAP_MMC_HIGHSPEED;
102
103         memcpy(&priv->cell_mmc, &sh_mobile_sdhi_cell, sizeof(priv->cell_mmc));
104         priv->cell_mmc.driver_data = &priv->mmc_data;
105         priv->cell_mmc.platform_data = &priv->cell_mmc;
106         priv->cell_mmc.data_size = sizeof(priv->cell_mmc);
107
108         platform_set_drvdata(pdev, priv);
109
110         ret = mfd_add_devices(&pdev->dev, pdev->id,
111                               &priv->cell_mmc, 1, mem, irq);
112         if (ret) {
113                 clk_disable(priv->clk);
114                 clk_put(priv->clk);
115                 kfree(priv);
116         }
117
118         return ret;
119 }
120
121 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
122 {
123         struct sh_mobile_sdhi *priv = platform_get_drvdata(pdev);
124
125         mfd_remove_devices(&pdev->dev);
126         clk_disable(priv->clk);
127         clk_put(priv->clk);
128         kfree(priv);
129
130         return 0;
131 }
132
133 static struct platform_driver sh_mobile_sdhi_driver = {
134         .driver         = {
135                 .name   = "sh_mobile_sdhi",
136                 .owner  = THIS_MODULE,
137         },
138         .probe          = sh_mobile_sdhi_probe,
139         .remove         = __devexit_p(sh_mobile_sdhi_remove),
140 };
141
142 static int __init sh_mobile_sdhi_init(void)
143 {
144         return platform_driver_register(&sh_mobile_sdhi_driver);
145 }
146
147 static void __exit sh_mobile_sdhi_exit(void)
148 {
149         platform_driver_unregister(&sh_mobile_sdhi_driver);
150 }
151
152 module_init(sh_mobile_sdhi_init);
153 module_exit(sh_mobile_sdhi_exit);
154
155 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
156 MODULE_AUTHOR("Magnus Damm");
157 MODULE_LICENSE("GPL v2");