tmio_mmc.c revision 8e7bfdb37ac001c95d2c768932b57de1019409cd 
1/*
2 * linux/drivers/mmc/host/tmio_mmc.c
3 *
4 * Copyright (C) 2007 Ian Molton
5 * Copyright (C) 2004 Ian Molton
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Driver for the MMC / SD / SDIO cell found in:
12 *
13 * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
14 */
15
16#include <linux/device.h>
17#include <linux/mfd/core.h>
18#include <linux/mfd/tmio.h>
19#include <linux/mmc/host.h>
20#include <linux/module.h>
21#include <linux/pagemap.h>
22#include <linux/scatterlist.h>
23
24#include "tmio_mmc.h"
25
26#ifdef CONFIG_PM
27static int tmio_mmc_suspend(struct platform_device *dev, pm_message_t state)
28{
29	const struct mfd_cell *cell = mfd_get_cell(dev);
30	struct mmc_host *mmc = platform_get_drvdata(dev);
31	int ret;
32
33	ret = tmio_mmc_host_suspend(&dev->dev);
34
35	/* Tell MFD core it can disable us now.*/
36	if (!ret && cell->disable)
37		cell->disable(dev);
38
39	return ret;
40}
41
42static int tmio_mmc_resume(struct platform_device *dev)
43{
44	const struct mfd_cell *cell = mfd_get_cell(dev);
45	struct mmc_host *mmc = platform_get_drvdata(dev);
46	int ret = 0;
47
48	/* Tell the MFD core we are ready to be enabled */
49	if (cell->resume)
50		ret = cell->resume(dev);
51
52	if (!ret)
53		ret = tmio_mmc_host_resume(&dev->dev);
54
55	return ret;
56}
57#else
58#define tmio_mmc_suspend NULL
59#define tmio_mmc_resume NULL
60#endif
61
62static int __devinit tmio_mmc_probe(struct platform_device *pdev)
63{
64	const struct mfd_cell *cell = mfd_get_cell(pdev);
65	struct tmio_mmc_data *pdata;
66	struct tmio_mmc_host *host;
67	int ret = -EINVAL, irq;
68
69	if (pdev->num_resources != 2)
70		goto out;
71
72	pdata = mfd_get_data(pdev);
73	if (!pdata || !pdata->hclk)
74		goto out;
75
76	irq = platform_get_irq(pdev, 0);
77	if (irq < 0) {
78		ret = irq;
79		goto out;
80	}
81
82	/* Tell the MFD core we are ready to be enabled */
83	if (cell->enable) {
84		ret = cell->enable(pdev);
85		if (ret)
86			goto out;
87	}
88
89	ret = tmio_mmc_host_probe(&host, pdev, pdata);
90	if (ret)
91		goto cell_disable;
92
93	ret = request_irq(irq, tmio_mmc_irq, IRQF_DISABLED |
94			  IRQF_TRIGGER_FALLING, dev_name(&pdev->dev), host);
95	if (ret)
96		goto host_remove;
97
98	pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
99		(unsigned long)host->ctl, irq);
100
101	return 0;
102
103host_remove:
104	tmio_mmc_host_remove(host);
105cell_disable:
106	if (cell->disable)
107		cell->disable(pdev);
108out:
109	return ret;
110}
111
112static int __devexit tmio_mmc_remove(struct platform_device *pdev)
113{
114	const struct mfd_cell *cell = mfd_get_cell(pdev);
115	struct mmc_host *mmc = platform_get_drvdata(pdev);
116
117	platform_set_drvdata(pdev, NULL);
118
119	if (mmc) {
120		struct tmio_mmc_host *host = mmc_priv(mmc);
121		free_irq(platform_get_irq(pdev, 0), host);
122		tmio_mmc_host_remove(host);
123		if (cell->disable)
124			cell->disable(pdev);
125	}
126
127	return 0;
128}
129
130/* ------------------- device registration ----------------------- */
131
132static struct platform_driver tmio_mmc_driver = {
133	.driver = {
134		.name = "tmio-mmc",
135		.owner = THIS_MODULE,
136	},
137	.probe = tmio_mmc_probe,
138	.remove = __devexit_p(tmio_mmc_remove),
139	.suspend = tmio_mmc_suspend,
140	.resume = tmio_mmc_resume,
141};
142
143
144static int __init tmio_mmc_init(void)
145{
146	return platform_driver_register(&tmio_mmc_driver);
147}
148
149static void __exit tmio_mmc_exit(void)
150{
151	platform_driver_unregister(&tmio_mmc_driver);
152}
153
154module_init(tmio_mmc_init);
155module_exit(tmio_mmc_exit);
156
157MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
158MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
159MODULE_LICENSE("GPL v2");
160MODULE_ALIAS("platform:tmio-mmc");
161