1 /* linux/drivers/mmc/host/sdhci-pxa.c
3 * Copyright (C) 2010 Marvell International Ltd.
4 * Zhangfei Gao <zhangfei.gao@marvell.com>
5 * Kevin Wang <dwang4@marvell.com>
6 * Mingwei Wang <mwwang@marvell.com>
7 * Philip Rakity <prakity@marvell.com>
8 * Mark Brown <markb@marvell.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
16 * SDHCI support for MMP2/PXA910/PXA168
18 * Refer to sdhci-s3c.c.
21 #include <linux/delay.h>
22 #include <linux/platform_device.h>
23 #include <linux/mmc/host.h>
24 #include <linux/clk.h>
26 #include <linux/err.h>
27 #include <plat/sdhci.h>
30 #define DRIVER_NAME "sdhci-pxa"
32 #define SD_FIFO_PARAM 0x104
33 #define DIS_PAD_SD_CLK_GATE 0x400
36 struct sdhci_host *host;
37 struct sdhci_pxa_platdata *pdata;
44 /*****************************************************************************\
46 * SDHCI core callbacks *
48 \*****************************************************************************/
49 static void set_clock(struct sdhci_host *host, unsigned int clock)
51 struct sdhci_pxa *pxa = sdhci_priv(host);
55 if (pxa->clk_enable) {
56 clk_disable(pxa->clk);
60 if (0 == pxa->clk_enable) {
61 if (pxa->pdata->flags & PXA_FLAG_DISABLE_CLOCK_GATING) {
62 tmp = readl(host->ioaddr + SD_FIFO_PARAM);
63 tmp |= DIS_PAD_SD_CLK_GATE;
64 writel(tmp, host->ioaddr + SD_FIFO_PARAM);
72 static struct sdhci_ops sdhci_pxa_ops = {
73 .set_clock = set_clock,
76 /*****************************************************************************\
78 * Device probing/removal *
80 \*****************************************************************************/
82 static int __devinit sdhci_pxa_probe(struct platform_device *pdev)
84 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
85 struct device *dev = &pdev->dev;
86 struct sdhci_host *host = NULL;
87 struct resource *iomem = NULL;
88 struct sdhci_pxa *pxa = NULL;
91 irq = platform_get_irq(pdev, 0);
93 dev_err(dev, "no irq specified\n");
97 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
99 dev_err(dev, "no memory specified\n");
103 host = sdhci_alloc_host(&pdev->dev, sizeof(struct sdhci_pxa));
105 dev_err(dev, "failed to alloc host\n");
106 return PTR_ERR(host);
109 pxa = sdhci_priv(host);
114 pxa->clk = clk_get(dev, "PXA-SDHCLK");
115 if (IS_ERR(pxa->clk)) {
116 dev_err(dev, "failed to get io clock\n");
117 ret = PTR_ERR(pxa->clk);
121 pxa->res = request_mem_region(iomem->start, resource_size(iomem),
122 mmc_hostname(host->mmc));
124 dev_err(&pdev->dev, "cannot request region\n");
129 host->ioaddr = ioremap(iomem->start, resource_size(iomem));
131 dev_err(&pdev->dev, "failed to remap registers\n");
136 host->hw_name = "MMC";
137 host->ops = &sdhci_pxa_ops;
139 host->quirks = SDHCI_QUIRK_BROKEN_ADMA | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
142 host->quirks |= pdata->quirks;
144 ret = sdhci_add_host(host);
146 dev_err(&pdev->dev, "failed to add host\n");
150 if (pxa->pdata->max_speed)
151 host->mmc->f_max = pxa->pdata->max_speed;
153 platform_set_drvdata(pdev, host);
160 iounmap(host->ioaddr);
162 release_mem_region(pxa->res->start,
163 resource_size(pxa->res));
164 sdhci_free_host(host);
170 static int __devexit sdhci_pxa_remove(struct platform_device *pdev)
172 struct sdhci_host *host = platform_get_drvdata(pdev);
173 struct sdhci_pxa *pxa = sdhci_priv(host);
178 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
179 if (scratch == (u32)-1)
182 sdhci_remove_host(host, dead);
185 iounmap(host->ioaddr);
187 release_mem_region(pxa->res->start,
188 resource_size(pxa->res));
189 if (pxa->clk_enable) {
190 clk_disable(pxa->clk);
195 sdhci_free_host(host);
196 platform_set_drvdata(pdev, NULL);
203 static int sdhci_pxa_suspend(struct platform_device *dev, pm_message_t state)
205 struct sdhci_host *host = platform_get_drvdata(dev);
207 return sdhci_suspend_host(host, state);
210 static int sdhci_pxa_resume(struct platform_device *dev)
212 struct sdhci_host *host = platform_get_drvdata(dev);
214 return sdhci_resume_host(host);
217 #define sdhci_pxa_suspend NULL
218 #define sdhci_pxa_resume NULL
221 static struct platform_driver sdhci_pxa_driver = {
222 .probe = sdhci_pxa_probe,
223 .remove = __devexit_p(sdhci_pxa_remove),
224 .suspend = sdhci_pxa_suspend,
225 .resume = sdhci_pxa_resume,
228 .owner = THIS_MODULE,
232 /*****************************************************************************\
236 \*****************************************************************************/
238 static int __init sdhci_pxa_init(void)
240 return platform_driver_register(&sdhci_pxa_driver);
243 static void __exit sdhci_pxa_exit(void)
245 platform_driver_unregister(&sdhci_pxa_driver);
248 module_init(sdhci_pxa_init);
249 module_exit(sdhci_pxa_exit);
251 MODULE_DESCRIPTION("SDH controller driver for PXA168/PXA910/MMP2");
252 MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>");
253 MODULE_LICENSE("GPL v2");