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 void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
60 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
61 struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
62 bool ctrl_phy = false;
64 if (clock > MMC_HIGH_52_MAX_DTR && (!IS_ERR(sdhci_arasan->phy)))
68 phy_power_off(sdhci_arasan->phy);
70 sdhci_set_clock(host, clock);
73 phy_power_on(sdhci_arasan->phy);
76 static struct sdhci_ops sdhci_arasan_ops = {
77 .set_clock = sdhci_arasan_set_clock,
78 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
79 .get_timeout_clock = sdhci_arasan_get_timeout_clock,
80 .set_bus_width = sdhci_set_bus_width,
82 .set_uhs_signaling = sdhci_set_uhs_signaling,
85 static struct sdhci_pltfm_data sdhci_arasan_pdata = {
86 .ops = &sdhci_arasan_ops,
87 .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
88 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
89 SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
92 #ifdef CONFIG_PM_SLEEP
94 * sdhci_arasan_suspend - Suspend method for the driver
95 * @dev: Address of the device structure
96 * Return: 0 on success and error value on error
98 * Put the device in a low power state.
100 static int sdhci_arasan_suspend(struct device *dev)
102 struct platform_device *pdev = to_platform_device(dev);
103 struct sdhci_host *host = platform_get_drvdata(pdev);
104 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
105 struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
108 ret = sdhci_suspend_host(host);
112 if (!IS_ERR(sdhci_arasan->phy)) {
113 ret = phy_power_off(sdhci_arasan->phy);
115 dev_err(dev, "Cannot power off phy.\n");
116 sdhci_resume_host(host);
121 clk_disable(pltfm_host->clk);
122 clk_disable(sdhci_arasan->clk_ahb);
128 * sdhci_arasan_resume - Resume method for the driver
129 * @dev: Address of the device structure
130 * Return: 0 on success and error value on error
132 * Resume operation after suspend
134 static int sdhci_arasan_resume(struct device *dev)
136 struct platform_device *pdev = to_platform_device(dev);
137 struct sdhci_host *host = platform_get_drvdata(pdev);
138 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
139 struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
142 ret = clk_enable(sdhci_arasan->clk_ahb);
144 dev_err(dev, "Cannot enable AHB clock.\n");
148 ret = clk_enable(pltfm_host->clk);
150 dev_err(dev, "Cannot enable SD clock.\n");
154 if (!IS_ERR(sdhci_arasan->phy)) {
155 ret = phy_power_on(sdhci_arasan->phy);
157 dev_err(dev, "Cannot power on phy.\n");
162 return sdhci_resume_host(host);
164 #endif /* ! CONFIG_PM_SLEEP */
166 static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
167 sdhci_arasan_resume);
169 static int sdhci_arasan_probe(struct platform_device *pdev)
173 struct sdhci_host *host;
174 struct sdhci_pltfm_host *pltfm_host;
175 struct sdhci_arasan_data *sdhci_arasan;
177 sdhci_arasan = devm_kzalloc(&pdev->dev, sizeof(*sdhci_arasan),
182 sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
183 if (IS_ERR(sdhci_arasan->clk_ahb)) {
184 dev_err(&pdev->dev, "clk_ahb clock not found.\n");
185 ret = PTR_ERR(sdhci_arasan->clk_ahb);
189 clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
190 if (IS_ERR(clk_xin)) {
191 dev_err(&pdev->dev, "clk_xin clock not found.\n");
192 ret = PTR_ERR(clk_xin);
196 ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
198 dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
202 ret = clk_prepare_enable(clk_xin);
204 dev_err(&pdev->dev, "Unable to enable SD clock.\n");
208 host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, 0);
211 goto clk_disable_all;
214 if (of_device_is_compatible(pdev->dev.of_node, "arasan,sdhci-4.9a")) {
215 host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
216 host->quirks2 |= SDHCI_QUIRK2_HOST_NO_CMD23;
219 sdhci_get_of_property(pdev);
220 pltfm_host = sdhci_priv(host);
221 pltfm_host->priv = sdhci_arasan;
222 pltfm_host->clk = clk_xin;
224 ret = mmc_of_parse(host->mmc);
226 dev_err(&pdev->dev, "parsing dt failed (%u)\n", ret);
227 goto clk_disable_all;
230 sdhci_arasan->phy = ERR_PTR(-ENODEV);
231 if (of_device_is_compatible(pdev->dev.of_node,
232 "arasan,sdhci-5.1")) {
233 sdhci_arasan->phy = devm_phy_get(&pdev->dev,
235 if (IS_ERR(sdhci_arasan->phy)) {
236 ret = PTR_ERR(sdhci_arasan->phy);
237 dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");
238 goto clk_disable_all;
241 ret = phy_init(sdhci_arasan->phy);
243 dev_err(&pdev->dev, "phy_init err.\n");
244 goto clk_disable_all;
247 ret = phy_power_on(sdhci_arasan->phy);
249 dev_err(&pdev->dev, "phy_power_on err.\n");
254 ret = sdhci_add_host(host);
261 if (!IS_ERR(sdhci_arasan->phy))
262 phy_power_off(sdhci_arasan->phy);
264 if (!IS_ERR(sdhci_arasan->phy))
265 phy_exit(sdhci_arasan->phy);
267 clk_disable_unprepare(clk_xin);
269 clk_disable_unprepare(sdhci_arasan->clk_ahb);
271 sdhci_pltfm_free(pdev);
275 static int sdhci_arasan_remove(struct platform_device *pdev)
278 struct sdhci_host *host = platform_get_drvdata(pdev);
279 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
280 struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
282 if (!IS_ERR(sdhci_arasan->phy)) {
283 phy_power_off(sdhci_arasan->phy);
284 phy_exit(sdhci_arasan->phy);
287 ret = sdhci_pltfm_unregister(pdev);
289 clk_disable_unprepare(sdhci_arasan->clk_ahb);
294 static const struct of_device_id sdhci_arasan_of_match[] = {
295 { .compatible = "arasan,sdhci-8.9a" },
296 { .compatible = "arasan,sdhci-5.1" },
297 { .compatible = "arasan,sdhci-4.9a" },
300 MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
302 static struct platform_driver sdhci_arasan_driver = {
304 .name = "sdhci-arasan",
305 .of_match_table = sdhci_arasan_of_match,
306 .pm = &sdhci_arasan_dev_pm_ops,
308 .probe = sdhci_arasan_probe,
309 .remove = sdhci_arasan_remove,
312 module_platform_driver(sdhci_arasan_driver);
314 MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
315 MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
316 MODULE_LICENSE("GPL");