/drivers/mmc/host/sdhci-pxa.c

  1/* linux/drivers/mmc/host/sdhci-pxa.c
  2 *
  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>
  9 *
 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.
 13 */
 14
 15/* Supports:
 16 * SDHCI support for MMP2/PXA910/PXA168
 17 *
 18 * Refer to sdhci-s3c.c.
 19 */
 20
 21#include <linux/delay.h>
 22#include <linux/platform_device.h>
 23#include <linux/mmc/host.h>
 24#include <linux/clk.h>
 25#include <linux/io.h>
 26#include <linux/err.h>
 27#include <plat/sdhci.h>
 28#include "sdhci.h"
 29
 30#define DRIVER_NAME	"sdhci-pxa"
 31
 32#define SD_FIFO_PARAM		0x104
 33#define DIS_PAD_SD_CLK_GATE	0x400
 34
 35struct sdhci_pxa {
 36	struct sdhci_host		*host;
 37	struct sdhci_pxa_platdata	*pdata;
 38	struct clk			*clk;
 39	struct resource			*res;
 40
 41	u8 clk_enable;
 42};
 43
 44/*****************************************************************************\
 45 *                                                                           *
 46 * SDHCI core callbacks                                                      *
 47 *                                                                           *
 48\*****************************************************************************/
 49static void set_clock(struct sdhci_host *host, unsigned int clock)
 50{
 51	struct sdhci_pxa *pxa = sdhci_priv(host);
 52	u32 tmp = 0;
 53
 54	if (clock == 0) {
 55		if (pxa->clk_enable) {
 56			clk_disable(pxa->clk);
 57			pxa->clk_enable = 0;
 58		}
 59	} else {
 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);
 65			}
 66			clk_enable(pxa->clk);
 67			pxa->clk_enable = 1;
 68		}
 69	}
 70}
 71
 72static int set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
 73{
 74	u16 ctrl_2;
 75
 76	/*
 77	 * Set V18_EN -- UHS modes do not work without this.
 78	 * does not change signaling voltage
 79	 */
 80	ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 81
 82	/* Select Bus Speed Mode for host */
 83	ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
 84	switch (uhs) {
 85	case MMC_TIMING_UHS_SDR12:
 86		ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
 87		break;
 88	case MMC_TIMING_UHS_SDR25:
 89		ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
 90		break;
 91	case MMC_TIMING_UHS_SDR50:
 92		ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180;
 93		break;
 94	case MMC_TIMING_UHS_SDR104:
 95		ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180;
 96		break;
 97	case MMC_TIMING_UHS_DDR50:
 98		ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180;
 99		break;
100	}
101
102	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
103	pr_debug("%s:%s uhs = %d, ctrl_2 = %04X\n",
104		__func__, mmc_hostname(host->mmc), uhs, ctrl_2);
105
106	return 0;
107}
108
109static struct sdhci_ops sdhci_pxa_ops = {
110	.set_uhs_signaling = set_uhs_signaling,
111	.set_clock = set_clock,
112};
113
114/*****************************************************************************\
115 *                                                                           *
116 * Device probing/removal                                                    *
117 *                                                                           *
118\*****************************************************************************/
119
120static int __devinit sdhci_pxa_probe(struct platform_device *pdev)
121{
122	struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
123	struct device *dev = &pdev->dev;
124	struct sdhci_host *host = NULL;
125	struct resource *iomem = NULL;
126	struct sdhci_pxa *pxa = NULL;
127	int ret, irq;
128
129	irq = platform_get_irq(pdev, 0);
130	if (irq < 0) {
131		dev_err(dev, "no irq specified\n");
132		return irq;
133	}
134
135	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
136	if (!iomem) {
137		dev_err(dev, "no memory specified\n");
138		return -ENOENT;
139	}
140
141	host = sdhci_alloc_host(&pdev->dev, sizeof(struct sdhci_pxa));
142	if (IS_ERR(host)) {
143		dev_err(dev, "failed to alloc host\n");
144		return PTR_ERR(host);
145	}
146
147	pxa = sdhci_priv(host);
148	pxa->host = host;
149	pxa->pdata = pdata;
150	pxa->clk_enable = 0;
151
152	pxa->clk = clk_get(dev, "PXA-SDHCLK");
153	if (IS_ERR(pxa->clk)) {
154		dev_err(dev, "failed to get io clock\n");
155		ret = PTR_ERR(pxa->clk);
156		goto out;
157	}
158
159	pxa->res = request_mem_region(iomem->start, resource_size(iomem),
160				      mmc_hostname(host->mmc));
161	if (!pxa->res) {
162		dev_err(&pdev->dev, "cannot request region\n");
163		ret = -EBUSY;
164		goto out;
165	}
166
167	host->ioaddr = ioremap(iomem->start, resource_size(iomem));
168	if (!host->ioaddr) {
169		dev_err(&pdev->dev, "failed to remap registers\n");
170		ret = -ENOMEM;
171		goto out;
172	}
173
174	host->hw_name = "MMC";
175	host->ops = &sdhci_pxa_ops;
176	host->irq = irq;
177	host->quirks = SDHCI_QUIRK_BROKEN_ADMA
178		| SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
179		| SDHCI_QUIRK_32BIT_DMA_ADDR
180		| SDHCI_QUIRK_32BIT_DMA_SIZE
181		| SDHCI_QUIRK_32BIT_ADMA_SIZE
182		| SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC;
183
184	if (pdata->quirks)
185		host->quirks |= pdata->quirks;
186
187	/* enable 1/8V DDR capable */
188	host->mmc->caps |= MMC_CAP_1_8V_DDR;
189
190	/* If slot design supports 8 bit data, indicate this to MMC. */
191	if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
192		host->mmc->caps |= MMC_CAP_8_BIT_DATA;
193
194	ret = sdhci_add_host(host);
195	if (ret) {
196		dev_err(&pdev->dev, "failed to add host\n");
197		goto out;
198	}
199
200	if (pxa->pdata->max_speed)
201		host->mmc->f_max = pxa->pdata->max_speed;
202
203	platform_set_drvdata(pdev, host);
204
205	return 0;
206out:
207	if (host) {
208		clk_put(pxa->clk);
209		if (host->ioaddr)
210			iounmap(host->ioaddr);
211		if (pxa->res)
212			release_mem_region(pxa->res->start,
213					   resource_size(pxa->res));
214		sdhci_free_host(host);
215	}
216
217	return ret;
218}
219
220static int __devexit sdhci_pxa_remove(struct platform_device *pdev)
221{
222	struct sdhci_host *host = platform_get_drvdata(pdev);
223	struct sdhci_pxa *pxa = sdhci_priv(host);
224	int dead = 0;
225	u32 scratch;
226
227	if (host) {
228		scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
229		if (scratch == (u32)-1)
230			dead = 1;
231
232		sdhci_remove_host(host, dead);
233
234		if (host->ioaddr)
235			iounmap(host->ioaddr);
236		if (pxa->res)
237			release_mem_region(pxa->res->start,
238					   resource_size(pxa->res));
239		if (pxa->clk_enable) {
240			clk_disable(pxa->clk);
241			pxa->clk_enable = 0;
242		}
243		clk_put(pxa->clk);
244
245		sdhci_free_host(host);
246		platform_set_drvdata(pdev, NULL);
247	}
248
249	return 0;
250}
251
252#ifdef CONFIG_PM
253static int sdhci_pxa_suspend(struct platform_device *dev, pm_message_t state)
254{
255	struct sdhci_host *host = platform_get_drvdata(dev);
256
257	return sdhci_suspend_host(host, state);
258}
259
260static int sdhci_pxa_resume(struct platform_device *dev)
261{
262	struct sdhci_host *host = platform_get_drvdata(dev);
263
264	return sdhci_resume_host(host);
265}
266#else
267#define sdhci_pxa_suspend	NULL
268#define sdhci_pxa_resume	NULL
269#endif
270
271static struct platform_driver sdhci_pxa_driver = {
272	.probe		= sdhci_pxa_probe,
273	.remove		= __devexit_p(sdhci_pxa_remove),
274	.suspend	= sdhci_pxa_suspend,
275	.resume		= sdhci_pxa_resume,
276	.driver		= {
277		.name	= DRIVER_NAME,
278		.owner	= THIS_MODULE,
279	},
280};
281
282/*****************************************************************************\
283 *                                                                           *
284 * Driver init/exit                                                          *
285 *                                                                           *
286\*****************************************************************************/
287
288static int __init sdhci_pxa_init(void)
289{
290	return platform_driver_register(&sdhci_pxa_driver);
291}
292
293static void __exit sdhci_pxa_exit(void)
294{
295	platform_driver_unregister(&sdhci_pxa_driver);
296}
297
298module_init(sdhci_pxa_init);
299module_exit(sdhci_pxa_exit);
300
301MODULE_DESCRIPTION("SDH controller driver for PXA168/PXA910/MMP2");
302MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>");
303MODULE_LICENSE("GPL v2");