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_get_property(np, "sdhci,auto-cmd12", NULL))
79		host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
80
81	if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
82	    (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
83	    bus_width == 1))
84		host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
85
86	if (sdhci_of_wp_inverted(np))
87		host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
88
89	if (of_get_property(np, "broken-cd", NULL))
90		host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
91
92	if (of_get_property(np, "no-1-8-v", NULL))
93		host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
94
95	if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
96		host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
97
98	if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
99	    of_device_is_compatible(np, "fsl,p1010-esdhc") ||
100	    of_device_is_compatible(np, "fsl,t4240-esdhc") ||
101	    of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
102		host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
103
104	clk = of_get_property(np, "clock-frequency", &size);
105	if (clk && size == sizeof(*clk) && *clk)
106		pltfm_host->clock = be32_to_cpup(clk);
107
108	if (of_find_property(np, "keep-power-in-suspend", NULL))
109		host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
110
111	if (of_find_property(np, "enable-sdio-wakeup", NULL))
112		host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
113}
114#else
115void sdhci_get_of_property(struct platform_device *pdev) {}
116#endif /* CONFIG_OF */
117EXPORT_SYMBOL_GPL(sdhci_get_of_property);
118
119struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
120				    const struct sdhci_pltfm_data *pdata,
121				    size_t priv_size)
122{
123	struct sdhci_host *host;
124	struct resource *iomem;
125	int ret;
126
127	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
128	if (!iomem) {
129		ret = -ENOMEM;
130		goto err;
131	}
132
133	if (resource_size(iomem) < 0x100)
134		dev_err(&pdev->dev, "Invalid iomem size!\n");
135
136	host = sdhci_alloc_host(&pdev->dev,
137		sizeof(struct sdhci_pltfm_host) + priv_size);
138
139	if (IS_ERR(host)) {
140		ret = PTR_ERR(host);
141		goto err;
142	}
143
144	host->hw_name = dev_name(&pdev->dev);
145	if (pdata && pdata->ops)
146		host->ops = pdata->ops;
147	else
148		host->ops = &sdhci_pltfm_ops;
149	if (pdata) {
150		host->quirks = pdata->quirks;
151		host->quirks2 = pdata->quirks2;
152	}
153
154	host->irq = platform_get_irq(pdev, 0);
155
156	if (!request_mem_region(iomem->start, resource_size(iomem),
157		mmc_hostname(host->mmc))) {
158		dev_err(&pdev->dev, "cannot request region\n");
159		ret = -EBUSY;
160		goto err_request;
161	}
162
163	host->ioaddr = ioremap(iomem->start, resource_size(iomem));
164	if (!host->ioaddr) {
165		dev_err(&pdev->dev, "failed to remap registers\n");
166		ret = -ENOMEM;
167		goto err_remap;
168	}
169
170	/*
171	 * Some platforms need to probe the controller to be able to
172	 * determine which caps should be used.
173	 */
174	if (host->ops && host->ops->platform_init)
175		host->ops->platform_init(host);
176
177	platform_set_drvdata(pdev, host);
178
179	return host;
180
181err_remap:
182	release_mem_region(iomem->start, resource_size(iomem));
183err_request:
184	sdhci_free_host(host);
185err:
186	dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
187	return ERR_PTR(ret);
188}
189EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
190
191void sdhci_pltfm_free(struct platform_device *pdev)
192{
193	struct sdhci_host *host = platform_get_drvdata(pdev);
194	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
195
196	iounmap(host->ioaddr);
197	release_mem_region(iomem->start, resource_size(iomem));
198	sdhci_free_host(host);
199}
200EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
201
202int sdhci_pltfm_register(struct platform_device *pdev,
203			const struct sdhci_pltfm_data *pdata,
204			size_t priv_size)
205{
206	struct sdhci_host *host;
207	int ret = 0;
208
209	host = sdhci_pltfm_init(pdev, pdata, priv_size);
210	if (IS_ERR(host))
211		return PTR_ERR(host);
212
213	sdhci_get_of_property(pdev);
214
215	ret = sdhci_add_host(host);
216	if (ret)
217		sdhci_pltfm_free(pdev);
218
219	return ret;
220}
221EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
222
223int sdhci_pltfm_unregister(struct platform_device *pdev)
224{
225	struct sdhci_host *host = platform_get_drvdata(pdev);
226	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
227	int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
228
229	sdhci_remove_host(host, dead);
230	clk_disable_unprepare(pltfm_host->clk);
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