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 = sdhci_pltfm_priv(pltfm_host);
62 bool ctrl_phy = false;
64 if (clock > MMC_HIGH_52_MAX_DTR && (!IS_ERR(sdhci_arasan->phy)))
68 spin_unlock_irq(&host->lock);
69 phy_power_off(sdhci_arasan->phy);
70 spin_lock_irq(&host->lock);
73 sdhci_set_clock(host, clock);
76 spin_unlock_irq(&host->lock);
77 phy_power_on(sdhci_arasan->phy);
78 spin_lock_irq(&host->lock);
82 static struct sdhci_ops sdhci_arasan_ops = {
83 .set_clock = sdhci_arasan_set_clock,
84 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
85 .get_timeout_clock = sdhci_arasan_get_timeout_clock,
86 .set_bus_width = sdhci_set_bus_width,
88 .set_uhs_signaling = sdhci_set_uhs_signaling,
91 static struct sdhci_pltfm_data sdhci_arasan_pdata = {
92 .ops = &sdhci_arasan_ops,
93 .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
94 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
95 SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
98 #ifdef CONFIG_PM_SLEEP
100 * sdhci_arasan_suspend - Suspend method for the driver
101 * @dev: Address of the device structure
102 * Returns 0 on success and error value on error
104 * Put the device in a low power state.
106 static int sdhci_arasan_suspend(struct device *dev)
108 struct platform_device *pdev = to_platform_device(dev);
109 struct sdhci_host *host = platform_get_drvdata(pdev);
110 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
111 struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
114 ret = sdhci_suspend_host(host);
118 if (!IS_ERR(sdhci_arasan->phy)) {
119 ret = phy_power_off(sdhci_arasan->phy);
121 dev_err(dev, "Cannot power off phy.\n");
122 sdhci_resume_host(host);
127 clk_disable(pltfm_host->clk);
128 clk_disable(sdhci_arasan->clk_ahb);
134 * sdhci_arasan_resume - Resume method for the driver
135 * @dev: Address of the device structure
136 * Returns 0 on success and error value on error
138 * Resume operation after suspend
140 static int sdhci_arasan_resume(struct device *dev)
142 struct platform_device *pdev = to_platform_device(dev);
143 struct sdhci_host *host = platform_get_drvdata(pdev);
144 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
145 struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
148 ret = clk_enable(sdhci_arasan->clk_ahb);
150 dev_err(dev, "Cannot enable AHB clock.\n");
154 ret = clk_enable(pltfm_host->clk);
156 dev_err(dev, "Cannot enable SD clock.\n");
160 if (!IS_ERR(sdhci_arasan->phy)) {
161 ret = phy_power_on(sdhci_arasan->phy);
163 dev_err(dev, "Cannot power on phy.\n");
168 return sdhci_resume_host(host);
170 #endif /* ! CONFIG_PM_SLEEP */
172 static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
173 sdhci_arasan_resume);
175 static int sdhci_arasan_probe(struct platform_device *pdev)
179 struct sdhci_host *host;
180 struct sdhci_pltfm_host *pltfm_host;
181 struct sdhci_arasan_data *sdhci_arasan;
183 host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata,
184 sizeof(*sdhci_arasan));
186 return PTR_ERR(host);
188 pltfm_host = sdhci_priv(host);
189 sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
191 sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
192 if (IS_ERR(sdhci_arasan->clk_ahb)) {
193 dev_err(&pdev->dev, "clk_ahb clock not found.\n");
194 ret = PTR_ERR(sdhci_arasan->clk_ahb);
198 clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
199 if (IS_ERR(clk_xin)) {
200 dev_err(&pdev->dev, "clk_xin clock not found.\n");
201 ret = PTR_ERR(clk_xin);
205 ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
207 dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
211 ret = clk_prepare_enable(clk_xin);
213 dev_err(&pdev->dev, "Unable to enable SD clock.\n");
217 sdhci_get_of_property(pdev);
218 pltfm_host->clk = clk_xin;
220 ret = mmc_of_parse(host->mmc);
222 dev_err(&pdev->dev, "parsing dt failed (%u)\n", ret);
223 goto clk_disable_all;
226 sdhci_arasan->phy = ERR_PTR(-ENODEV);
227 if (of_device_is_compatible(pdev->dev.of_node,
228 "arasan,sdhci-5.1")) {
229 sdhci_arasan->phy = devm_phy_get(&pdev->dev,
231 if (IS_ERR(sdhci_arasan->phy)) {
232 ret = PTR_ERR(sdhci_arasan->phy);
233 dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");
234 goto clk_disable_all;
237 ret = phy_init(sdhci_arasan->phy);
239 dev_err(&pdev->dev, "phy_init err.\n");
240 goto clk_disable_all;
243 ret = phy_power_on(sdhci_arasan->phy);
245 dev_err(&pdev->dev, "phy_power_on err.\n");
250 ret = sdhci_add_host(host);
257 if (!IS_ERR(sdhci_arasan->phy))
258 phy_power_off(sdhci_arasan->phy);
260 if (!IS_ERR(sdhci_arasan->phy))
261 phy_exit(sdhci_arasan->phy);
263 clk_disable_unprepare(clk_xin);
265 clk_disable_unprepare(sdhci_arasan->clk_ahb);
267 sdhci_pltfm_free(pdev);
271 static int sdhci_arasan_remove(struct platform_device *pdev)
274 struct sdhci_host *host = platform_get_drvdata(pdev);
275 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
276 struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
277 struct clk *clk_ahb = sdhci_arasan->clk_ahb;
279 if (!IS_ERR(sdhci_arasan->phy)) {
280 phy_power_off(sdhci_arasan->phy);
281 phy_exit(sdhci_arasan->phy);
284 ret = sdhci_pltfm_unregister(pdev);
286 clk_disable_unprepare(clk_ahb);
291 static const struct of_device_id sdhci_arasan_of_match[] = {
292 { .compatible = "arasan,sdhci-8.9a" },
293 { .compatible = "arasan,sdhci-5.1" },
294 { .compatible = "arasan,sdhci-4.9a" },
297 MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
299 static struct platform_driver sdhci_arasan_driver = {
301 .name = "sdhci-arasan",
302 .of_match_table = sdhci_arasan_of_match,
303 .pm = &sdhci_arasan_dev_pm_ops,
305 .probe = sdhci_arasan_probe,
306 .remove = sdhci_arasan_remove,
309 module_platform_driver(sdhci_arasan_driver);
311 MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
312 MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
313 MODULE_LICENSE("GPL");