sdhci-pltfm.c

  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
149int sdhci_pltfm_init_and_add_host(struct platform_device *pdev,
150				  const struct sdhci_pltfm_data *pdata,
151				  size_t priv_size)
152{
153	struct sdhci_host *host;
154
155	host = sdhci_pltfm_init(pdev, pdata, priv_size);
156	if (IS_ERR(host))
157		return PTR_ERR(host);
158
159	sdhci_get_property(pdev);
160
161	return sdhci_add_host(host);
162}
163EXPORT_SYMBOL_GPL(sdhci_pltfm_init_and_add_host);
164
165void sdhci_pltfm_remove(struct platform_device *pdev)
166{
167	struct sdhci_host *host = platform_get_drvdata(pdev);
168	int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
169
170	sdhci_remove_host(host, dead);
171}
172EXPORT_SYMBOL_GPL(sdhci_pltfm_remove);
173
174#ifdef CONFIG_PM_SLEEP
175int sdhci_pltfm_suspend(struct device *dev)
176{
177	struct sdhci_host *host = dev_get_drvdata(dev);
178	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
179	int ret;
180
181	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
182		mmc_retune_needed(host->mmc);
183
184	ret = sdhci_suspend_host(host);
185	if (ret)
186		return ret;
187
188	clk_disable_unprepare(pltfm_host->clk);
189
190	return 0;
191}
192EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
193
194int sdhci_pltfm_resume(struct device *dev)
195{
196	struct sdhci_host *host = dev_get_drvdata(dev);
197	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
198	int ret;
199
200	ret = clk_prepare_enable(pltfm_host->clk);
201	if (ret)
202		return ret;
203
204	ret = sdhci_resume_host(host);
205	if (ret)
206		clk_disable_unprepare(pltfm_host->clk);
207
208	return ret;
209}
210EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
211#endif
212
213const struct dev_pm_ops sdhci_pltfm_pmops = {
214	SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume)
215};
216EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
217
218static int __init sdhci_pltfm_drv_init(void)
219{
220	pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
221
222	return 0;
223}
224module_init(sdhci_pltfm_drv_init);
225
226static void __exit sdhci_pltfm_drv_exit(void)
227{
228}
229module_exit(sdhci_pltfm_drv_exit);
230
231MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
232MODULE_AUTHOR("Intel Corporation");
233MODULE_LICENSE("GPL v2");