MFD,mmc: tmio_mmc: make HCLK configurable
[linux-2.6.git] / drivers / mfd / tc6387xb.c
1 /*
2  * Toshiba TC6387XB support
3  * Copyright (c) 2005 Ian Molton
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  *
9  * This file contains TC6387XB base support.
10  *
11  */
12
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/clk.h>
16 #include <linux/err.h>
17 #include <linux/mfd/core.h>
18 #include <linux/mfd/tmio.h>
19 #include <linux/mfd/tc6387xb.h>
20
21 enum {
22         TC6387XB_CELL_MMC,
23 };
24
25 #ifdef CONFIG_PM
26 static int tc6387xb_suspend(struct platform_device *dev, pm_message_t state)
27 {
28         struct clk *clk32k = platform_get_drvdata(dev);
29         struct tc6387xb_platform_data *pdata = dev->dev.platform_data;
30
31         if (pdata && pdata->suspend)
32                 pdata->suspend(dev);
33         clk_disable(clk32k);
34
35         return 0;
36 }
37
38 static int tc6387xb_resume(struct platform_device *dev)
39 {
40         struct clk *clk32k = platform_get_drvdata(dev);
41         struct tc6387xb_platform_data *pdata = dev->dev.platform_data;
42
43         clk_enable(clk32k);
44         if (pdata && pdata->resume)
45                 pdata->resume(dev);
46
47         return 0;
48 }
49 #else
50 #define tc6387xb_suspend  NULL
51 #define tc6387xb_resume   NULL
52 #endif
53
54 /*--------------------------------------------------------------------------*/
55
56 static int tc6387xb_mmc_enable(struct platform_device *mmc)
57 {
58         struct platform_device *dev      = to_platform_device(mmc->dev.parent);
59         struct clk *clk32k = platform_get_drvdata(dev);
60
61         clk_enable(clk32k);
62
63         return 0;
64 }
65
66 static int tc6387xb_mmc_disable(struct platform_device *mmc)
67 {
68         struct platform_device *dev      = to_platform_device(mmc->dev.parent);
69         struct clk *clk32k = platform_get_drvdata(dev);
70
71         clk_disable(clk32k);
72
73         return 0;
74 }
75
76 /*--------------------------------------------------------------------------*/
77
78 const static struct tmio_mmc_data tc6387xb_mmc_data = {
79         .hclk = 24000000,
80 };
81
82 static struct resource tc6387xb_mmc_resources[] = {
83         {
84                 .start = 0x800,
85                 .end   = 0x9ff,
86                 .flags = IORESOURCE_MEM,
87         },
88         {
89                 .start = 0x200,
90                 .end   = 0x2ff,
91                 .flags = IORESOURCE_MEM,
92         },
93         {
94                 .start = 0,
95                 .end   = 0,
96                 .flags = IORESOURCE_IRQ,
97         },
98 };
99
100 static struct mfd_cell tc6387xb_cells[] = {
101         [TC6387XB_CELL_MMC] = {
102                 .name = "tmio-mmc",
103                 .enable = tc6387xb_mmc_enable,
104                 .disable = tc6387xb_mmc_disable,
105                 .driver_data = &tc6387xb_mmc_data,
106                 .num_resources = ARRAY_SIZE(tc6387xb_mmc_resources),
107                 .resources = tc6387xb_mmc_resources,
108         },
109 };
110
111 static int tc6387xb_probe(struct platform_device *dev)
112 {
113         struct tc6387xb_platform_data *pdata = dev->dev.platform_data;
114         struct resource *iomem;
115         struct clk *clk32k;
116         int irq, ret;
117
118         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
119         if (!iomem) {
120                 return -EINVAL;
121         }
122
123         ret  = platform_get_irq(dev, 0);
124         if (ret >= 0)
125                 irq = ret;
126         else
127                 goto err_resource;
128
129         clk32k = clk_get(&dev->dev, "CLK_CK32K");
130         if (IS_ERR(clk32k)) {
131                 ret = PTR_ERR(clk32k);
132                 goto err_resource;
133         }
134         platform_set_drvdata(dev, clk32k);
135
136         if (pdata && pdata->enable)
137                 pdata->enable(dev);
138
139         printk(KERN_INFO "Toshiba tc6387xb initialised\n");
140
141         tc6387xb_cells[TC6387XB_CELL_MMC].platform_data =
142                 &tc6387xb_cells[TC6387XB_CELL_MMC];
143         tc6387xb_cells[TC6387XB_CELL_MMC].data_size =
144                 sizeof(tc6387xb_cells[TC6387XB_CELL_MMC]);
145
146         ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells,
147                               ARRAY_SIZE(tc6387xb_cells), iomem, irq);
148
149         if (!ret)
150                 return 0;
151
152         clk_put(clk32k);
153 err_resource:
154         return ret;
155 }
156
157 static int tc6387xb_remove(struct platform_device *dev)
158 {
159         struct clk *clk32k = platform_get_drvdata(dev);
160
161         mfd_remove_devices(&dev->dev);
162         clk_disable(clk32k);
163         clk_put(clk32k);
164         platform_set_drvdata(dev, NULL);
165
166         return 0;
167 }
168
169
170 static struct platform_driver tc6387xb_platform_driver = {
171         .driver = {
172                 .name           = "tc6387xb",
173         },
174         .probe          = tc6387xb_probe,
175         .remove         = tc6387xb_remove,
176         .suspend        = tc6387xb_suspend,
177         .resume         = tc6387xb_resume,
178 };
179
180
181 static int __init tc6387xb_init(void)
182 {
183         return platform_driver_register(&tc6387xb_platform_driver);
184 }
185
186 static void __exit tc6387xb_exit(void)
187 {
188         platform_driver_unregister(&tc6387xb_platform_driver);
189 }
190
191 module_init(tc6387xb_init);
192 module_exit(tc6387xb_exit);
193
194 MODULE_DESCRIPTION("Toshiba TC6387XB core driver");
195 MODULE_LICENSE("GPL v2");
196 MODULE_AUTHOR("Ian Molton");
197 MODULE_ALIAS("platform:tc6387xb");