1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * sdhci-pltfm.c Support for SDHCI platform devices
4 * Copyright (c) 2009 Intel Corporation
5 *
6 * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc.
7 * Copyright (c) 2009 MontaVista Software, Inc.
8 *
9 * Authors: Xiaobo Xie <X.Xie@freescale.com>
10 *	    Anton Vorontsov <avorontsov@ru.mvista.com>
11 */
12
13/* Supports:
14 * SDHCI platform devices
15 *
16 * Inspired by sdhci-pci.c, by Pierre Ossman
17 */
18
19#include <linux/err.h>
20#include <linux/module.h>
21#include <linux/property.h>
22#ifdef CONFIG_PPC
23#include <asm/machdep.h>
24#endif
25#include "sdhci-pltfm.h"
26
27unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host)
28{
29	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
30
31	return clk_get_rate(pltfm_host->clk);
32}
33EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock);
34
35static const struct sdhci_ops sdhci_pltfm_ops = {
36	.set_clock = sdhci_set_clock,
37	.set_bus_width = sdhci_set_bus_width,
38	.reset = sdhci_reset,
39	.set_uhs_signaling = sdhci_set_uhs_signaling,
40};
41
42static bool sdhci_wp_inverted(struct device *dev)
43{
44	if (device_property_present(dev, "sdhci,wp-inverted") ||
45	    device_property_present(dev, "wp-inverted"))
46		return true;
47
48	/* Old device trees don't have the wp-inverted property. */
49#ifdef CONFIG_PPC
50	return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
51#else
52	return false;
53#endif /* CONFIG_PPC */
54}
55
56static void sdhci_get_compatibility(struct platform_device *pdev)
57{
58	struct device *dev = &pdev->dev;
59	struct sdhci_host *host = platform_get_drvdata(pdev);
60
61	if (device_is_compatible(dev, "fsl,p2020-rev1-esdhc"))
62		host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
63
64	if (device_is_compatible(dev, "fsl,p2020-esdhc") ||
65	    device_is_compatible(dev, "fsl,p1010-esdhc") ||
66	    device_is_compatible(dev, "fsl,t4240-esdhc") ||
67	    device_is_compatible(dev, "fsl,mpc8536-esdhc"))
68		host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
69}
70
71void sdhci_get_property(struct platform_device *pdev)
72{
73	struct device *dev = &pdev->dev;
74	struct sdhci_host *host = platform_get_drvdata(pdev);
75	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
76	u32 bus_width;
77
78	if (device_property_present(dev, "sdhci,auto-cmd12"))
79		host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
80
81	if (device_property_present(dev, "sdhci,1-bit-only") ||
82	    (device_property_read_u32(dev, "bus-width", &bus_width) == 0 &&
83	    bus_width == 1))
84		host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
85
86	if (sdhci_wp_inverted(dev))
87		host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
88
89	if (device_property_present(dev, "broken-cd"))
90		host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
91
92	if (device_property_present(dev, "no-1-8-v"))
93		host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
94
95	sdhci_get_compatibility(pdev);
96
97	device_property_read_u32(dev, "clock-frequency", &pltfm_host->clock);
98
99	if (device_property_present(dev, "keep-power-in-suspend"))
100		host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
101
102	if (device_property_read_bool(dev, "wakeup-source") ||
103	    device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
104		host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
105}
106EXPORT_SYMBOL_GPL(sdhci_get_property);
107
108struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
109				    const struct sdhci_pltfm_data *pdata,
110				    size_t priv_size)
111{
112	struct sdhci_host *host;
113	void __iomem *ioaddr;
114	int irq;
115
116	ioaddr = devm_platform_ioremap_resource(pdev, 0);
117	if (IS_ERR(ioaddr))
118		return ERR_CAST(ioaddr);
119
120	irq = platform_get_irq(pdev, 0);
121	if (irq < 0)
122		return ERR_PTR(irq);
123
124	host = sdhci_alloc_host(&pdev->dev,
125		sizeof(struct sdhci_pltfm_host) + priv_size);
126	if (IS_ERR(host)) {
127		dev_err(&pdev->dev, "%s failed %pe\n", __func__, host);
128		return ERR_CAST(host);
129	}
130
131	host->ioaddr = ioaddr;
132	host->irq = irq;
133	host->hw_name = dev_name(&pdev->dev);
134	if (pdata && pdata->ops)
135		host->ops = pdata->ops;
136	else
137		host->ops = &sdhci_pltfm_ops;
138	if (pdata) {
139		host->quirks = pdata->quirks;
140		host->quirks2 = pdata->quirks2;
141	}
142
143	platform_set_drvdata(pdev, host);
144
145	return host;
146}
147EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
148
149void sdhci_pltfm_free(struct platform_device *pdev)
150{
151	struct sdhci_host *host = platform_get_drvdata(pdev);
152
153	sdhci_free_host(host);
154}
155EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
156
157int sdhci_pltfm_init_and_add_host(struct platform_device *pdev,
158				  const struct sdhci_pltfm_data *pdata,
159				  size_t priv_size)
160{
161	struct sdhci_host *host;
162	int ret = 0;
163
164	host = sdhci_pltfm_init(pdev, pdata, priv_size);
165	if (IS_ERR(host))
166		return PTR_ERR(host);
167
168	sdhci_get_property(pdev);
169
170	ret = sdhci_add_host(host);
171	if (ret)
172		sdhci_pltfm_free(pdev);
173
174	return ret;
175}
176EXPORT_SYMBOL_GPL(sdhci_pltfm_init_and_add_host);
177
178void sdhci_pltfm_remove(struct platform_device *pdev)
179{
180	struct sdhci_host *host = platform_get_drvdata(pdev);
181	int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
182
183	sdhci_remove_host(host, dead);
184	sdhci_pltfm_free(pdev);
185}
186EXPORT_SYMBOL_GPL(sdhci_pltfm_remove);
187
188#ifdef CONFIG_PM_SLEEP
189int sdhci_pltfm_suspend(struct device *dev)
190{
191	struct sdhci_host *host = dev_get_drvdata(dev);
192	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
193	int ret;
194
195	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
196		mmc_retune_needed(host->mmc);
197
198	ret = sdhci_suspend_host(host);
199	if (ret)
200		return ret;
201
202	clk_disable_unprepare(pltfm_host->clk);
203
204	return 0;
205}
206EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
207
208int sdhci_pltfm_resume(struct device *dev)
209{
210	struct sdhci_host *host = dev_get_drvdata(dev);
211	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
212	int ret;
213
214	ret = clk_prepare_enable(pltfm_host->clk);
215	if (ret)
216		return ret;
217
218	ret = sdhci_resume_host(host);
219	if (ret)
220		clk_disable_unprepare(pltfm_host->clk);
221
222	return ret;
223}
224EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
225#endif
226
227const struct dev_pm_ops sdhci_pltfm_pmops = {
228	SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume)
229};
230EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
231
232static int __init sdhci_pltfm_drv_init(void)
233{
234	pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
235
236	return 0;
237}
238module_init(sdhci_pltfm_drv_init);
239
240static void __exit sdhci_pltfm_drv_exit(void)
241{
242}
243module_exit(sdhci_pltfm_drv_exit);
244
245MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
246MODULE_AUTHOR("Intel Corporation");
247MODULE_LICENSE("GPL v2");
248