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#include <linux/of.h>
23#ifdef CONFIG_PPC
24#include <asm/machdep.h>
25#endif
26#include "sdhci-pltfm.h"
27
28unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host)
29{
30	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
31
32	return clk_get_rate(pltfm_host->clk);
33}
34EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock);
35
36static const struct sdhci_ops sdhci_pltfm_ops = {
37	.set_clock = sdhci_set_clock,
38	.set_bus_width = sdhci_set_bus_width,
39	.reset = sdhci_reset,
40	.set_uhs_signaling = sdhci_set_uhs_signaling,
41};
42
43static bool sdhci_wp_inverted(struct device *dev)
44{
45	if (device_property_present(dev, "sdhci,wp-inverted") ||
46	    device_property_present(dev, "wp-inverted"))
47		return true;
48
49	/* Old device trees don't have the wp-inverted property. */
50#ifdef CONFIG_PPC
51	return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
52#else
53	return false;
54#endif /* CONFIG_PPC */
55}
56
57static void sdhci_get_compatibility(struct platform_device *pdev)
58{
59	struct sdhci_host *host = platform_get_drvdata(pdev);
60	struct device_node *np = pdev->dev.of_node;
61
62	if (!np)
63		return;
64
65	if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
66		host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
67
68	if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
69	    of_device_is_compatible(np, "fsl,p1010-esdhc") ||
70	    of_device_is_compatible(np, "fsl,t4240-esdhc") ||
71	    of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
72		host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
73}
74
75void sdhci_get_property(struct platform_device *pdev)
76{
77	struct device *dev = &pdev->dev;
78	struct sdhci_host *host = platform_get_drvdata(pdev);
79	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
80	u32 bus_width;
81
82	if (device_property_present(dev, "sdhci,auto-cmd12"))
83		host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
84
85	if (device_property_present(dev, "sdhci,1-bit-only") ||
86	    (device_property_read_u32(dev, "bus-width", &bus_width) == 0 &&
87	    bus_width == 1))
88		host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
89
90	if (sdhci_wp_inverted(dev))
91		host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
92
93	if (device_property_present(dev, "broken-cd"))
94		host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
95
96	if (device_property_present(dev, "no-1-8-v"))
97		host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
98
99	sdhci_get_compatibility(pdev);
100
101	device_property_read_u32(dev, "clock-frequency", &pltfm_host->clock);
102
103	if (device_property_present(dev, "keep-power-in-suspend"))
104		host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
105
106	if (device_property_read_bool(dev, "wakeup-source") ||
107	    device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
108		host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
109}
110EXPORT_SYMBOL_GPL(sdhci_get_property);
111
112struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
113				    const struct sdhci_pltfm_data *pdata,
114				    size_t priv_size)
115{
116	struct sdhci_host *host;
117	void __iomem *ioaddr;
118	int irq, ret;
119
120	ioaddr = devm_platform_ioremap_resource(pdev, 0);
121	if (IS_ERR(ioaddr)) {
122		ret = PTR_ERR(ioaddr);
123		goto err;
124	}
125
126	irq = platform_get_irq(pdev, 0);
127	if (irq < 0) {
128		ret = irq;
129		goto err;
130	}
131
132	host = sdhci_alloc_host(&pdev->dev,
133		sizeof(struct sdhci_pltfm_host) + priv_size);
134
135	if (IS_ERR(host)) {
136		ret = PTR_ERR(host);
137		goto err;
138	}
139
140	host->ioaddr = ioaddr;
141	host->irq = irq;
142	host->hw_name = dev_name(&pdev->dev);
143	if (pdata && pdata->ops)
144		host->ops = pdata->ops;
145	else
146		host->ops = &sdhci_pltfm_ops;
147	if (pdata) {
148		host->quirks = pdata->quirks;
149		host->quirks2 = pdata->quirks2;
150	}
151
152	platform_set_drvdata(pdev, host);
153
154	return host;
155err:
156	dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
157	return ERR_PTR(ret);
158}
159EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
160
161void sdhci_pltfm_free(struct platform_device *pdev)
162{
163	struct sdhci_host *host = platform_get_drvdata(pdev);
164
165	sdhci_free_host(host);
166}
167EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
168
169int sdhci_pltfm_init_and_add_host(struct platform_device *pdev,
170				  const struct sdhci_pltfm_data *pdata,
171				  size_t priv_size)
172{
173	struct sdhci_host *host;
174	int ret = 0;
175
176	host = sdhci_pltfm_init(pdev, pdata, priv_size);
177	if (IS_ERR(host))
178		return PTR_ERR(host);
179
180	sdhci_get_property(pdev);
181
182	ret = sdhci_add_host(host);
183	if (ret)
184		sdhci_pltfm_free(pdev);
185
186	return ret;
187}
188EXPORT_SYMBOL_GPL(sdhci_pltfm_init_and_add_host);
189
190void sdhci_pltfm_remove(struct platform_device *pdev)
191{
192	struct sdhci_host *host = platform_get_drvdata(pdev);
193	int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
194
195	sdhci_remove_host(host, dead);
196	sdhci_pltfm_free(pdev);
197}
198EXPORT_SYMBOL_GPL(sdhci_pltfm_remove);
199
200#ifdef CONFIG_PM_SLEEP
201int sdhci_pltfm_suspend(struct device *dev)
202{
203	struct sdhci_host *host = dev_get_drvdata(dev);
204	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
205	int ret;
206
207	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
208		mmc_retune_needed(host->mmc);
209
210	ret = sdhci_suspend_host(host);
211	if (ret)
212		return ret;
213
214	clk_disable_unprepare(pltfm_host->clk);
215
216	return 0;
217}
218EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
219
220int sdhci_pltfm_resume(struct device *dev)
221{
222	struct sdhci_host *host = dev_get_drvdata(dev);
223	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
224	int ret;
225
226	ret = clk_prepare_enable(pltfm_host->clk);
227	if (ret)
228		return ret;
229
230	ret = sdhci_resume_host(host);
231	if (ret)
232		clk_disable_unprepare(pltfm_host->clk);
233
234	return ret;
235}
236EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
237#endif
238
239const struct dev_pm_ops sdhci_pltfm_pmops = {
240	SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume)
241};
242EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
243
244static int __init sdhci_pltfm_drv_init(void)
245{
246	pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
247
248	return 0;
249}
250module_init(sdhci_pltfm_drv_init);
251
252static void __exit sdhci_pltfm_drv_exit(void)
253{
254}
255module_exit(sdhci_pltfm_drv_exit);
256
257MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
258MODULE_AUTHOR("Intel Corporation");
259MODULE_LICENSE("GPL v2");
260