2 * Arasan Secure Digital Host Controller Interface.
3 * Copyright (C) 2011 - 2012 Michal Simek <monstr@monstr.eu>
4 * Copyright (c) 2012 Wind River Systems, Inc.
5 * Copyright (C) 2013 Pengutronix e.K.
6 * Copyright (C) 2013 Xilinx Inc.
8 * Based on sdhci-of-esdhc.c
10 * Copyright (c) 2007 Freescale Semiconductor, Inc.
11 * Copyright (c) 2009 MontaVista Software, Inc.
13 * Authors: Xiaobo Xie <X.Xie@freescale.com>
14 * Anton Vorontsov <avorontsov@ru.mvista.com>
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or (at
19 * your option) any later version.
22 #include <linux/module.h>
23 #include <linux/of_device.h>
24 #include <linux/phy/phy.h>
25 #include "sdhci-pltfm.h"
27 #define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c
29 #define CLK_CTRL_TIMEOUT_SHIFT 16
30 #define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT)
31 #define CLK_CTRL_TIMEOUT_MIN_EXP 13
34 * struct sdhci_arasan_data
35 * @clk_ahb: Pointer to the AHB clock
36 * @phy: Pointer to the generic phy
38 struct sdhci_arasan_data {
43 static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
47 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
49 div = readl(host->ioaddr + SDHCI_ARASAN_CLK_CTRL_OFFSET);
50 div = (div & CLK_CTRL_TIMEOUT_MASK) >> CLK_CTRL_TIMEOUT_SHIFT;
52 freq = clk_get_rate(pltfm_host->clk);
53 freq /= 1 << (CLK_CTRL_TIMEOUT_MIN_EXP + div);
58 static struct sdhci_ops sdhci_arasan_ops = {
59 .set_clock = sdhci_set_clock,
60 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
61 .get_timeout_clock = sdhci_arasan_get_timeout_clock,
62 .set_bus_width = sdhci_set_bus_width,
64 .set_uhs_signaling = sdhci_set_uhs_signaling,
67 static struct sdhci_pltfm_data sdhci_arasan_pdata = {
68 .ops = &sdhci_arasan_ops,
69 .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
70 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
71 SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
74 #ifdef CONFIG_PM_SLEEP
76 * sdhci_arasan_suspend - Suspend method for the driver
77 * @dev: Address of the device structure
78 * Returns 0 on success and error value on error
80 * Put the device in a low power state.
82 static int sdhci_arasan_suspend(struct device *dev)
84 struct platform_device *pdev = to_platform_device(dev);
85 struct sdhci_host *host = platform_get_drvdata(pdev);
86 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
87 struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
90 ret = sdhci_suspend_host(host);
94 if (!IS_ERR(sdhci_arasan->phy)) {
95 ret = phy_power_off(sdhci_arasan->phy);
97 dev_err(dev, "Cannot power off phy.\n");
98 sdhci_resume_host(host);
103 clk_disable(pltfm_host->clk);
104 clk_disable(sdhci_arasan->clk_ahb);
110 * sdhci_arasan_resume - Resume method for the driver
111 * @dev: Address of the device structure
112 * Returns 0 on success and error value on error
114 * Resume operation after suspend
116 static int sdhci_arasan_resume(struct device *dev)
118 struct platform_device *pdev = to_platform_device(dev);
119 struct sdhci_host *host = platform_get_drvdata(pdev);
120 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
121 struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
124 ret = clk_enable(sdhci_arasan->clk_ahb);
126 dev_err(dev, "Cannot enable AHB clock.\n");
130 ret = clk_enable(pltfm_host->clk);
132 dev_err(dev, "Cannot enable SD clock.\n");
136 if (!IS_ERR(sdhci_arasan->phy)) {
137 ret = phy_power_on(sdhci_arasan->phy);
139 dev_err(dev, "Cannot power on phy.\n");
144 return sdhci_resume_host(host);
146 #endif /* ! CONFIG_PM_SLEEP */
148 static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
149 sdhci_arasan_resume);
151 static int sdhci_arasan_probe(struct platform_device *pdev)
155 struct sdhci_host *host;
156 struct sdhci_pltfm_host *pltfm_host;
157 struct sdhci_arasan_data *sdhci_arasan;
159 host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata,
160 sizeof(*sdhci_arasan));
162 return PTR_ERR(host);
164 pltfm_host = sdhci_priv(host);
165 sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
167 sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
168 if (IS_ERR(sdhci_arasan->clk_ahb)) {
169 dev_err(&pdev->dev, "clk_ahb clock not found.\n");
170 ret = PTR_ERR(sdhci_arasan->clk_ahb);
174 clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
175 if (IS_ERR(clk_xin)) {
176 dev_err(&pdev->dev, "clk_xin clock not found.\n");
177 ret = PTR_ERR(clk_xin);
181 ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
183 dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
187 ret = clk_prepare_enable(clk_xin);
189 dev_err(&pdev->dev, "Unable to enable SD clock.\n");
193 sdhci_get_of_property(pdev);
194 pltfm_host->clk = clk_xin;
196 ret = mmc_of_parse(host->mmc);
198 dev_err(&pdev->dev, "parsing dt failed (%u)\n", ret);
199 goto clk_disable_all;
202 sdhci_arasan->phy = ERR_PTR(-ENODEV);
203 if (of_device_is_compatible(pdev->dev.of_node,
204 "arasan,sdhci-5.1")) {
205 sdhci_arasan->phy = devm_phy_get(&pdev->dev,
207 if (IS_ERR(sdhci_arasan->phy)) {
208 ret = PTR_ERR(sdhci_arasan->phy);
209 dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");
210 goto clk_disable_all;
213 ret = phy_init(sdhci_arasan->phy);
215 dev_err(&pdev->dev, "phy_init err.\n");
216 goto clk_disable_all;
219 ret = phy_power_on(sdhci_arasan->phy);
221 dev_err(&pdev->dev, "phy_power_on err.\n");
226 ret = sdhci_add_host(host);
233 if (!IS_ERR(sdhci_arasan->phy))
234 phy_power_off(sdhci_arasan->phy);
236 if (!IS_ERR(sdhci_arasan->phy))
237 phy_exit(sdhci_arasan->phy);
239 clk_disable_unprepare(clk_xin);
241 clk_disable_unprepare(sdhci_arasan->clk_ahb);
243 sdhci_pltfm_free(pdev);
247 static int sdhci_arasan_remove(struct platform_device *pdev)
250 struct sdhci_host *host = platform_get_drvdata(pdev);
251 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
252 struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
253 struct clk *clk_ahb = sdhci_arasan->clk_ahb;
255 if (!IS_ERR(sdhci_arasan->phy)) {
256 phy_power_off(sdhci_arasan->phy);
257 phy_exit(sdhci_arasan->phy);
260 ret = sdhci_pltfm_unregister(pdev);
262 clk_disable_unprepare(clk_ahb);
267 static const struct of_device_id sdhci_arasan_of_match[] = {
268 { .compatible = "arasan,sdhci-8.9a" },
269 { .compatible = "arasan,sdhci-5.1" },
270 { .compatible = "arasan,sdhci-4.9a" },
273 MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
275 static struct platform_driver sdhci_arasan_driver = {
277 .name = "sdhci-arasan",
278 .of_match_table = sdhci_arasan_of_match,
279 .pm = &sdhci_arasan_dev_pm_ops,
281 .probe = sdhci_arasan_probe,
282 .remove = sdhci_arasan_remove,
285 module_platform_driver(sdhci_arasan_driver);
287 MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
288 MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
289 MODULE_LICENSE("GPL");