[net-next-2.6.git] / drivers / mmc / host / sdhci-pltfm.c

/*
 * sdhci-pltfm.c Support for SDHCI platform devices
 * Copyright (c) 2009 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Supports:
 * SDHCI platform devices
 *
 * Inspired by sdhci-pci.c, by Pierre Ossman
 */

#include <linux/delay.h>
#include <linux/highmem.h>
#include <linux/platform_device.h>

#include <linux/mmc/host.h>

#include <linux/io.h>

#include "sdhci.h"

/*****************************************************************************\
 *                                                                           *
 * SDHCI core callbacks                                                      *
 *                                                                           *
\*****************************************************************************/

static struct sdhci_ops sdhci_pltfm_ops = {
};

/*****************************************************************************\
 *                                                                           *
 * Device probing/removal                                                    *
 *                                                                           *
\*****************************************************************************/

static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
{
	struct sdhci_host *host;
	struct resource *iomem;
	int ret;

	BUG_ON(pdev == NULL);

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!iomem) {
		ret = -ENOMEM;
		goto err;
	}

	if (resource_size(iomem) != 0x100)
		dev_err(&pdev->dev, "Invalid iomem size. You may "
			"experience problems.\n");

	if (pdev->dev.parent)
		host = sdhci_alloc_host(pdev->dev.parent, 0);
	else
		host = sdhci_alloc_host(&pdev->dev, 0);

	if (IS_ERR(host)) {
		ret = PTR_ERR(host);
		goto err;
	}

	host->hw_name = "platform";
	host->ops = &sdhci_pltfm_ops;
	host->irq = platform_get_irq(pdev, 0);

	if (!request_mem_region(iomem->start, resource_size(iomem),
		mmc_hostname(host->mmc))) {
		dev_err(&pdev->dev, "cannot request region\n");
		ret = -EBUSY;
		goto err_request;
	}

	host->ioaddr = ioremap(iomem->start, resource_size(iomem));
	if (!host->ioaddr) {
		dev_err(&pdev->dev, "failed to remap registers\n");
		ret = -ENOMEM;
		goto err_remap;
	}

	ret = sdhci_add_host(host);
	if (ret)
		goto err_add_host;

	platform_set_drvdata(pdev, host);

	return 0;

err_add_host:
	iounmap(host->ioaddr);
err_remap:
	release_mem_region(iomem->start, resource_size(iomem));
err_request:
	sdhci_free_host(host);
err:
	printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
	return ret;
}

static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
{
	struct sdhci_host *host = platform_get_drvdata(pdev);
	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	int dead;
	u32 scratch;

	dead = 0;
	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
	if (scratch == (u32)-1)
		dead = 1;

	sdhci_remove_host(host, dead);
	iounmap(host->ioaddr);
	release_mem_region(iomem->start, resource_size(iomem));
	sdhci_free_host(host);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver sdhci_pltfm_driver = {
	.driver = {
		.name	= "sdhci",
		.owner	= THIS_MODULE,
	},
	.probe		= sdhci_pltfm_probe,
	.remove		= __devexit_p(sdhci_pltfm_remove),
};

/*****************************************************************************\
 *                                                                           *
 * Driver init/exit                                                          *
 *                                                                           *
\*****************************************************************************/

static int __init sdhci_drv_init(void)
{
	return platform_driver_register(&sdhci_pltfm_driver);
}

static void __exit sdhci_drv_exit(void)
{
	platform_driver_unregister(&sdhci_pltfm_driver);
}

module_init(sdhci_drv_init);
module_exit(sdhci_drv_exit);

MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:sdhci");
Commit	Line	Data
a3456a2d RR	1	/*
	2	* sdhci-pltfm.c Support for SDHCI platform devices
	3	* Copyright (c) 2009 Intel Corporation
	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 program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	17	*/
	18
	19	/* Supports:
	20	* SDHCI platform devices
	21	*
	22	* Inspired by sdhci-pci.c, by Pierre Ossman
	23	*/
	24
	25	#include <linux/delay.h>
	26	#include <linux/highmem.h>
	27	#include <linux/platform_device.h>
	28
	29	#include <linux/mmc/host.h>
	30
	31	#include <linux/io.h>
	32
	33	#include "sdhci.h"
	34
	35	/*****************************************************************************\
	36	* *
	37	* SDHCI core callbacks *
	38	* *
	39	\*****************************************************************************/
	40
	41	static struct sdhci_ops sdhci_pltfm_ops = {
	42	};
	43
	44	/*****************************************************************************\
	45	* *
	46	* Device probing/removal *
	47	* *
	48	\*****************************************************************************/
	49
	50	static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
	51	{
	52	struct sdhci_host *host;
	53	struct resource *iomem;
	54	int ret;
	55
	56	BUG_ON(pdev == NULL);
	57
	58	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	59	if (!iomem) {
	60	ret = -ENOMEM;
	61	goto err;
	62	}
	63
	64	if (resource_size(iomem) != 0x100)
65	dev_err(&pdev->dev, "Invalid iomem size. You may "
66	"experience problems.\n");
67
68	if (pdev->dev.parent)
69	host = sdhci_alloc_host(pdev->dev.parent, 0);
70	else
71	host = sdhci_alloc_host(&pdev->dev, 0);
72
73	if (IS_ERR(host)) {
74	ret = PTR_ERR(host);
75	goto err;
76	}
77
78	host->hw_name = "platform";
79	host->ops = &sdhci_pltfm_ops;
80	host->irq = platform_get_irq(pdev, 0);
81
82	if (!request_mem_region(iomem->start, resource_size(iomem),
83	mmc_hostname(host->mmc))) {
84	dev_err(&pdev->dev, "cannot request region\n");
85	ret = -EBUSY;
86	goto err_request;
87	}
88
89	host->ioaddr = ioremap(iomem->start, resource_size(iomem));
90	if (!host->ioaddr) {
91	dev_err(&pdev->dev, "failed to remap registers\n");
92	ret = -ENOMEM;
93	goto err_remap;
94	}
95
96	ret = sdhci_add_host(host);
97	if (ret)
98	goto err_add_host;
99
100	platform_set_drvdata(pdev, host);
101
102	return 0;
103
104	err_add_host:
105	iounmap(host->ioaddr);
106	err_remap:
107	release_mem_region(iomem->start, resource_size(iomem));
108	err_request:
109	sdhci_free_host(host);
110	err:
111	printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
112	return ret;
113	}
114
115	static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
116	{
117	struct sdhci_host *host = platform_get_drvdata(pdev);
118	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
119	int dead;
120	u32 scratch;
121
122	dead = 0;
123	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
124	if (scratch == (u32)-1)
125	dead = 1;
126
127	sdhci_remove_host(host, dead);
128	iounmap(host->ioaddr);
129	release_mem_region(iomem->start, resource_size(iomem));
130	sdhci_free_host(host);
131	platform_set_drvdata(pdev, NULL);
132
133	return 0;
134	}
135
136	static struct platform_driver sdhci_pltfm_driver = {
137	.driver = {
138	.name = "sdhci",
139	.owner = THIS_MODULE,
140	},
141	.probe = sdhci_pltfm_probe,
142	.remove = __devexit_p(sdhci_pltfm_remove),
143	};
144
145	/*****************************************************************************\
146	* *
147	* Driver init/exit *
148	* *
149	\*****************************************************************************/
150
151	static int __init sdhci_drv_init(void)
152	{
153	return platform_driver_register(&sdhci_pltfm_driver);
154	}
155
156	static void __exit sdhci_drv_exit(void)
157	{
158	platform_driver_unregister(&sdhci_pltfm_driver);
159	}
160
161	module_init(sdhci_drv_init);
162	module_exit(sdhci_drv_exit);
163
164	MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
165	MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
166	MODULE_LICENSE("GPL v2");
167	MODULE_ALIAS("platform:sdhci");
168