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1/*
2 * sdhci-pltfm.c Support for SDHCI platform devices
3 * Copyright (c) 2009 Intel Corporation
4 *
5 * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc.
6 * Copyright (c) 2009 MontaVista Software, Inc.
7 *
8 * Authors: Xiaobo Xie <X.Xie@freescale.com>
9 *	    Anton Vorontsov <avorontsov@ru.mvista.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25/* Supports:
26 * SDHCI platform devices
27 *
28 * Inspired by sdhci-pci.c, by Pierre Ossman
29 */
30
31#include <linux/err.h>
32#include <linux/module.h>
33#include <linux/of.h>
34#ifdef CONFIG_PPC
35#include <asm/machdep.h>
36#endif
37#include "sdhci-pltfm.h"
38
39unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host)
40{
41	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
42
43	return clk_get_rate(pltfm_host->clk);
44}
45EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock);
46
47static const struct sdhci_ops sdhci_pltfm_ops = {
48	.set_clock = sdhci_set_clock,
49	.set_bus_width = sdhci_set_bus_width,
50	.reset = sdhci_reset,
51	.set_uhs_signaling = sdhci_set_uhs_signaling,
52};
53
54#ifdef CONFIG_OF
55static bool sdhci_of_wp_inverted(struct device_node *np)
56{
57	if (of_get_property(np, "sdhci,wp-inverted", NULL) ||
58	    of_get_property(np, "wp-inverted", NULL))
59		return true;
60
61	/* Old device trees don't have the wp-inverted property. */
62#ifdef CONFIG_PPC
63	return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
64#else
65	return false;
66#endif /* CONFIG_PPC */
67}
68
69void sdhci_get_of_property(struct platform_device *pdev)
70{
71	struct device_node *np = pdev->dev.of_node;
72	struct sdhci_host *host = platform_get_drvdata(pdev);
73	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
74	const __be32 *clk;
75	u32 bus_width;
76	int size;
77
78	if (of_device_is_available(np)) {
79		if (of_get_property(np, "sdhci,auto-cmd12", NULL))
80			host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
81
82		if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
83		    (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
84		    bus_width == 1))
85			host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
86
87		if (sdhci_of_wp_inverted(np))
88			host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
89
90		if (of_get_property(np, "broken-cd", NULL))
91			host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
92
93		if (of_get_property(np, "no-1-8-v", NULL))
94			host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
95
96		if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
97			host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
98
99		if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
100		    of_device_is_compatible(np, "fsl,p1010-esdhc") ||
101		    of_device_is_compatible(np, "fsl,t4240-esdhc") ||
102		    of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
103			host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
104
105		clk = of_get_property(np, "clock-frequency", &size);
106		if (clk && size == sizeof(*clk) && *clk)
107			pltfm_host->clock = be32_to_cpup(clk);
108
109		if (of_find_property(np, "keep-power-in-suspend", NULL))
110			host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
111
112		if (of_find_property(np, "enable-sdio-wakeup", NULL))
113			host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
114	}
115}
116#else
117void sdhci_get_of_property(struct platform_device *pdev) {}
118#endif /* CONFIG_OF */
119EXPORT_SYMBOL_GPL(sdhci_get_of_property);
120
121struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
122				    const struct sdhci_pltfm_data *pdata,
123				    size_t priv_size)
124{
125	struct sdhci_host *host;
126	struct resource *iomem;
127	int ret;
128
129	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
130	if (!iomem) {
131		ret = -ENOMEM;
132		goto err;
133	}
134
135	if (resource_size(iomem) < 0x100)
136		dev_err(&pdev->dev, "Invalid iomem size!\n");
137
138	host = sdhci_alloc_host(&pdev->dev,
139		sizeof(struct sdhci_pltfm_host) + priv_size);
140
141	if (IS_ERR(host)) {
142		ret = PTR_ERR(host);
143		goto err;
144	}
145
146	host->hw_name = dev_name(&pdev->dev);
147	if (pdata && pdata->ops)
148		host->ops = pdata->ops;
149	else
150		host->ops = &sdhci_pltfm_ops;
151	if (pdata) {
152		host->quirks = pdata->quirks;
153		host->quirks2 = pdata->quirks2;
154	}
155
156	host->irq = platform_get_irq(pdev, 0);
157
158	if (!request_mem_region(iomem->start, resource_size(iomem),
159		mmc_hostname(host->mmc))) {
160		dev_err(&pdev->dev, "cannot request region\n");
161		ret = -EBUSY;
162		goto err_request;
163	}
164
165	host->ioaddr = ioremap(iomem->start, resource_size(iomem));
166	if (!host->ioaddr) {
167		dev_err(&pdev->dev, "failed to remap registers\n");
168		ret = -ENOMEM;
169		goto err_remap;
170	}
171
172	/*
173	 * Some platforms need to probe the controller to be able to
174	 * determine which caps should be used.
175	 */
176	if (host->ops && host->ops->platform_init)
177		host->ops->platform_init(host);
178
179	platform_set_drvdata(pdev, host);
180
181	return host;
182
183err_remap:
184	release_mem_region(iomem->start, resource_size(iomem));
185err_request:
186	sdhci_free_host(host);
187err:
188	dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
189	return ERR_PTR(ret);
190}
191EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
192
193void sdhci_pltfm_free(struct platform_device *pdev)
194{
195	struct sdhci_host *host = platform_get_drvdata(pdev);
196	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
197
198	iounmap(host->ioaddr);
199	release_mem_region(iomem->start, resource_size(iomem));
200	sdhci_free_host(host);
201}
202EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
203
204int sdhci_pltfm_register(struct platform_device *pdev,
205			const struct sdhci_pltfm_data *pdata,
206			size_t priv_size)
207{
208	struct sdhci_host *host;
209	int ret = 0;
210
211	host = sdhci_pltfm_init(pdev, pdata, priv_size);
212	if (IS_ERR(host))
213		return PTR_ERR(host);
214
215	sdhci_get_of_property(pdev);
216
217	ret = sdhci_add_host(host);
218	if (ret)
219		sdhci_pltfm_free(pdev);
220
221	return ret;
222}
223EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
224
225int sdhci_pltfm_unregister(struct platform_device *pdev)
226{
227	struct sdhci_host *host = platform_get_drvdata(pdev);
228	int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
229
230	sdhci_remove_host(host, dead);
231	sdhci_pltfm_free(pdev);
232
233	return 0;
234}
235EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
236
237#ifdef CONFIG_PM
238int sdhci_pltfm_suspend(struct device *dev)
239{
240	struct sdhci_host *host = dev_get_drvdata(dev);
241
242	return sdhci_suspend_host(host);
243}
244EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
245
246int sdhci_pltfm_resume(struct device *dev)
247{
248	struct sdhci_host *host = dev_get_drvdata(dev);
249
250	return sdhci_resume_host(host);
251}
252EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
253
254const struct dev_pm_ops sdhci_pltfm_pmops = {
255	.suspend	= sdhci_pltfm_suspend,
256	.resume		= sdhci_pltfm_resume,
257};
258EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
259#endif	/* CONFIG_PM */
260
261static int __init sdhci_pltfm_drv_init(void)
262{
263	pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
264
265	return 0;
266}
267module_init(sdhci_pltfm_drv_init);
268
269static void __exit sdhci_pltfm_drv_exit(void)
270{
271}
272module_exit(sdhci_pltfm_drv_exit);
273
274MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
275MODULE_AUTHOR("Intel Corporation");
276MODULE_LICENSE("GPL v2");
277