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/mod_devicetable.h>
28 #include <linux/platform_device.h>
30 #include <linux/mmc/host.h>
33 #include <linux/mmc/sdhci-pltfm.h>
36 #include "sdhci-pltfm.h"
38 /*****************************************************************************\
40 * SDHCI core callbacks *
42 \*****************************************************************************/
44 static struct sdhci_ops sdhci_pltfm_ops = {
47 /*****************************************************************************\
49 * Device probing/removal *
51 \*****************************************************************************/
53 static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
55 const struct platform_device_id *platid = platform_get_device_id(pdev);
56 struct sdhci_pltfm_data *pdata;
57 struct sdhci_host *host;
58 struct sdhci_pltfm_host *pltfm_host;
59 struct resource *iomem;
62 if (platid && platid->driver_data)
63 pdata = (void *)platid->driver_data;
65 pdata = pdev->dev.platform_data;
67 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
73 if (resource_size(iomem) < 0x100)
74 dev_err(&pdev->dev, "Invalid iomem size. You may "
75 "experience problems.\n");
77 /* Some PCI-based MFD need the parent here */
78 if (pdev->dev.parent != &platform_bus)
79 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
81 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
88 pltfm_host = sdhci_priv(host);
90 host->hw_name = "platform";
91 if (pdata && pdata->ops)
92 host->ops = pdata->ops;
94 host->ops = &sdhci_pltfm_ops;
96 host->quirks = pdata->quirks;
97 host->irq = platform_get_irq(pdev, 0);
99 if (!request_mem_region(iomem->start, resource_size(iomem),
100 mmc_hostname(host->mmc))) {
101 dev_err(&pdev->dev, "cannot request region\n");
106 host->ioaddr = ioremap(iomem->start, resource_size(iomem));
108 dev_err(&pdev->dev, "failed to remap registers\n");
113 if (pdata && pdata->init) {
114 ret = pdata->init(host, pdata);
119 ret = sdhci_add_host(host);
123 platform_set_drvdata(pdev, host);
128 if (pdata && pdata->exit)
131 iounmap(host->ioaddr);
133 release_mem_region(iomem->start, resource_size(iomem));
135 sdhci_free_host(host);
137 printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
141 static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
143 struct sdhci_pltfm_data *pdata = pdev->dev.platform_data;
144 struct sdhci_host *host = platform_get_drvdata(pdev);
145 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
150 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
151 if (scratch == (u32)-1)
154 sdhci_remove_host(host, dead);
155 if (pdata && pdata->exit)
157 iounmap(host->ioaddr);
158 release_mem_region(iomem->start, resource_size(iomem));
159 sdhci_free_host(host);
160 platform_set_drvdata(pdev, NULL);
165 static const struct platform_device_id sdhci_pltfm_ids[] = {
167 #ifdef CONFIG_MMC_SDHCI_CNS3XXX
168 { "sdhci-cns3xxx", (kernel_ulong_t)&sdhci_cns3xxx_pdata },
170 #ifdef CONFIG_MMC_SDHCI_ESDHC_IMX
171 { "sdhci-esdhc-imx", (kernel_ulong_t)&sdhci_esdhc_imx_pdata },
173 #ifdef CONFIG_MMC_SDHCI_DOVE
174 { "sdhci-dove", (kernel_ulong_t)&sdhci_dove_pdata },
176 #ifdef CONFIG_MMC_SDHCI_TEGRA
177 { "sdhci-tegra", (kernel_ulong_t)&sdhci_tegra_pdata },
181 MODULE_DEVICE_TABLE(platform, sdhci_pltfm_ids);
184 static int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)
186 struct sdhci_host *host = platform_get_drvdata(dev);
188 return sdhci_suspend_host(host, state);
191 static int sdhci_pltfm_resume(struct platform_device *dev)
193 struct sdhci_host *host = platform_get_drvdata(dev);
195 return sdhci_resume_host(host);
198 #define sdhci_pltfm_suspend NULL
199 #define sdhci_pltfm_resume NULL
200 #endif /* CONFIG_PM */
202 static struct platform_driver sdhci_pltfm_driver = {
205 .owner = THIS_MODULE,
207 .probe = sdhci_pltfm_probe,
208 .remove = __devexit_p(sdhci_pltfm_remove),
209 .id_table = sdhci_pltfm_ids,
210 .suspend = sdhci_pltfm_suspend,
211 .resume = sdhci_pltfm_resume,
214 /*****************************************************************************\
218 \*****************************************************************************/
220 static int __init sdhci_drv_init(void)
222 return platform_driver_register(&sdhci_pltfm_driver);
225 static void __exit sdhci_drv_exit(void)
227 platform_driver_unregister(&sdhci_pltfm_driver);
230 module_init(sdhci_drv_init);
231 module_exit(sdhci_drv_exit);
233 MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
234 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
235 MODULE_LICENSE("GPL v2");