2 * sdhci-pltfm.c Support for SDHCI platform devices
3 * Copyright (c) 2009 Intel Corporation
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.
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.
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.
20 * SDHCI platform devices
22 * Inspired by sdhci-pci.c, by Pierre Ossman
25 #include <linux/delay.h>
26 #include <linux/highmem.h>
27 #include <linux/platform_device.h>
29 #include <linux/mmc/host.h>
32 #include <linux/sdhci-pltfm.h>
36 /*****************************************************************************\
38 * SDHCI core callbacks *
40 \*****************************************************************************/
42 static struct sdhci_ops sdhci_pltfm_ops
= {
45 /*****************************************************************************\
47 * Device probing/removal *
49 \*****************************************************************************/
51 static int __devinit
sdhci_pltfm_probe(struct platform_device
*pdev
)
53 struct sdhci_pltfm_data
*pdata
= pdev
->dev
.platform_data
;
54 struct sdhci_host
*host
;
55 struct resource
*iomem
;
58 iomem
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
64 if (resource_size(iomem
) < 0x100)
65 dev_err(&pdev
->dev
, "Invalid iomem size. You may "
66 "experience problems.\n");
69 host
= sdhci_alloc_host(pdev
->dev
.parent
, 0);
71 host
= sdhci_alloc_host(&pdev
->dev
, 0);
78 host
->hw_name
= "platform";
79 if (pdata
&& pdata
->ops
)
80 host
->ops
= pdata
->ops
;
82 host
->ops
= &sdhci_pltfm_ops
;
84 host
->quirks
= pdata
->quirks
;
85 host
->irq
= platform_get_irq(pdev
, 0);
87 if (!request_mem_region(iomem
->start
, resource_size(iomem
),
88 mmc_hostname(host
->mmc
))) {
89 dev_err(&pdev
->dev
, "cannot request region\n");
94 host
->ioaddr
= ioremap(iomem
->start
, resource_size(iomem
));
96 dev_err(&pdev
->dev
, "failed to remap registers\n");
101 if (pdata
&& pdata
->init
) {
102 ret
= pdata
->init(host
);
107 ret
= sdhci_add_host(host
);
111 platform_set_drvdata(pdev
, host
);
116 if (pdata
&& pdata
->exit
)
119 iounmap(host
->ioaddr
);
121 release_mem_region(iomem
->start
, resource_size(iomem
));
123 sdhci_free_host(host
);
125 printk(KERN_ERR
"Probing of sdhci-pltfm failed: %d\n", ret
);
129 static int __devexit
sdhci_pltfm_remove(struct platform_device
*pdev
)
131 struct sdhci_pltfm_data
*pdata
= pdev
->dev
.platform_data
;
132 struct sdhci_host
*host
= platform_get_drvdata(pdev
);
133 struct resource
*iomem
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
138 scratch
= readl(host
->ioaddr
+ SDHCI_INT_STATUS
);
139 if (scratch
== (u32
)-1)
142 sdhci_remove_host(host
, dead
);
143 if (pdata
&& pdata
->exit
)
145 iounmap(host
->ioaddr
);
146 release_mem_region(iomem
->start
, resource_size(iomem
));
147 sdhci_free_host(host
);
148 platform_set_drvdata(pdev
, NULL
);
153 static struct platform_driver sdhci_pltfm_driver
= {
156 .owner
= THIS_MODULE
,
158 .probe
= sdhci_pltfm_probe
,
159 .remove
= __devexit_p(sdhci_pltfm_remove
),
162 /*****************************************************************************\
166 \*****************************************************************************/
168 static int __init
sdhci_drv_init(void)
170 return platform_driver_register(&sdhci_pltfm_driver
);
173 static void __exit
sdhci_drv_exit(void)
175 platform_driver_unregister(&sdhci_pltfm_driver
);
178 module_init(sdhci_drv_init
);
179 module_exit(sdhci_drv_exit
);
181 MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
182 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
183 MODULE_LICENSE("GPL v2");
184 MODULE_ALIAS("platform:sdhci");