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
28 #define SDHCI_ARASAN_VENDOR_REGISTER 0x78
30 #define VENDOR_ENHANCED_STROBE BIT(0)
31 #define CLK_CTRL_TIMEOUT_SHIFT 16
32 #define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT)
33 #define CLK_CTRL_TIMEOUT_MIN_EXP 13
36 * struct sdhci_arasan_data
37 * @clk_ahb: Pointer to the AHB clock
38 * @phy: Pointer to the generic phy
39 * @phy_on: True if the PHY is turned on.
41 struct sdhci_arasan_data {
47 static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
51 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
53 div = readl(host->ioaddr + SDHCI_ARASAN_CLK_CTRL_OFFSET);
54 div = (div & CLK_CTRL_TIMEOUT_MASK) >> CLK_CTRL_TIMEOUT_SHIFT;
56 freq = clk_get_rate(pltfm_host->clk);
57 freq /= 1 << (CLK_CTRL_TIMEOUT_MIN_EXP + div);
62 static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
64 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
65 struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
67 if (sdhci_arasan->phy_on && !IS_ERR(sdhci_arasan->phy)) {
68 sdhci_arasan->phy_on = false;
70 spin_unlock_irq(&host->lock);
71 phy_power_off(sdhci_arasan->phy);
72 spin_lock_irq(&host->lock);
75 sdhci_set_clock(host, clock);
77 if (host->mmc->actual_clock && !IS_ERR(sdhci_arasan->phy)) {
78 sdhci_arasan->phy_on = true;
80 spin_unlock_irq(&host->lock);
81 phy_power_on(sdhci_arasan->phy);
82 spin_lock_irq(&host->lock);
86 static void sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc,
90 struct sdhci_host *host = mmc_priv(mmc);
92 vendor = readl(host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER);
93 if (ios->enhanced_strobe)
94 vendor |= VENDOR_ENHANCED_STROBE;
96 vendor &= ~VENDOR_ENHANCED_STROBE;
98 writel(vendor, host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER);
101 static struct sdhci_ops sdhci_arasan_ops = {
102 .set_clock = sdhci_arasan_set_clock,
103 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
104 .get_timeout_clock = sdhci_arasan_get_timeout_clock,
105 .set_bus_width = sdhci_set_bus_width,
106 .reset = sdhci_reset,
107 .set_uhs_signaling = sdhci_set_uhs_signaling,
110 static struct sdhci_pltfm_data sdhci_arasan_pdata = {
111 .ops = &sdhci_arasan_ops,
112 .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
113 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
114 SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
117 #ifdef CONFIG_PM_SLEEP
119 * sdhci_arasan_suspend - Suspend method for the driver
120 * @dev: Address of the device structure
121 * Returns 0 on success and error value on error
123 * Put the device in a low power state.
125 static int sdhci_arasan_suspend(struct device *dev)
127 struct platform_device *pdev = to_platform_device(dev);
128 struct sdhci_host *host = platform_get_drvdata(pdev);
129 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
130 struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
133 ret = sdhci_suspend_host(host);
137 if (!IS_ERR(sdhci_arasan->phy)) {
138 ret = phy_power_off(sdhci_arasan->phy);
140 dev_err(dev, "Cannot power off phy.\n");
141 sdhci_resume_host(host);
146 clk_disable(pltfm_host->clk);
147 clk_disable(sdhci_arasan->clk_ahb);
153 * sdhci_arasan_resume - Resume method for the driver
154 * @dev: Address of the device structure
155 * Returns 0 on success and error value on error
157 * Resume operation after suspend
159 static int sdhci_arasan_resume(struct device *dev)
161 struct platform_device *pdev = to_platform_device(dev);
162 struct sdhci_host *host = platform_get_drvdata(pdev);
163 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
164 struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
167 ret = clk_enable(sdhci_arasan->clk_ahb);
169 dev_err(dev, "Cannot enable AHB clock.\n");
173 ret = clk_enable(pltfm_host->clk);
175 dev_err(dev, "Cannot enable SD clock.\n");
179 if (!IS_ERR(sdhci_arasan->phy)) {
180 ret = phy_power_on(sdhci_arasan->phy);
182 dev_err(dev, "Cannot power on phy.\n");
187 return sdhci_resume_host(host);
189 #endif /* ! CONFIG_PM_SLEEP */
191 static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
192 sdhci_arasan_resume);
194 static int sdhci_arasan_probe(struct platform_device *pdev)
198 struct sdhci_host *host;
199 struct sdhci_pltfm_host *pltfm_host;
200 struct sdhci_arasan_data *sdhci_arasan;
202 host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata,
203 sizeof(*sdhci_arasan));
205 return PTR_ERR(host);
207 pltfm_host = sdhci_priv(host);
208 sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
210 sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
211 if (IS_ERR(sdhci_arasan->clk_ahb)) {
212 dev_err(&pdev->dev, "clk_ahb clock not found.\n");
213 ret = PTR_ERR(sdhci_arasan->clk_ahb);
217 clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
218 if (IS_ERR(clk_xin)) {
219 dev_err(&pdev->dev, "clk_xin clock not found.\n");
220 ret = PTR_ERR(clk_xin);
224 ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
226 dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
230 ret = clk_prepare_enable(clk_xin);
232 dev_err(&pdev->dev, "Unable to enable SD clock.\n");
236 sdhci_get_of_property(pdev);
237 pltfm_host->clk = clk_xin;
239 ret = mmc_of_parse(host->mmc);
241 dev_err(&pdev->dev, "parsing dt failed (%u)\n", ret);
242 goto clk_disable_all;
245 sdhci_arasan->phy = ERR_PTR(-ENODEV);
246 if (of_device_is_compatible(pdev->dev.of_node,
247 "arasan,sdhci-5.1")) {
248 sdhci_arasan->phy = devm_phy_get(&pdev->dev,
250 if (IS_ERR(sdhci_arasan->phy)) {
251 ret = PTR_ERR(sdhci_arasan->phy);
252 dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");
253 goto clk_disable_all;
256 ret = phy_init(sdhci_arasan->phy);
258 dev_err(&pdev->dev, "phy_init err.\n");
259 goto clk_disable_all;
262 host->mmc_host_ops.hs400_enhanced_strobe =
263 sdhci_arasan_hs400_enhanced_strobe;
266 ret = sdhci_add_host(host);
273 if (!IS_ERR(sdhci_arasan->phy))
274 phy_exit(sdhci_arasan->phy);
276 clk_disable_unprepare(clk_xin);
278 clk_disable_unprepare(sdhci_arasan->clk_ahb);
280 sdhci_pltfm_free(pdev);
284 static int sdhci_arasan_remove(struct platform_device *pdev)
287 struct sdhci_host *host = platform_get_drvdata(pdev);
288 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
289 struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
290 struct clk *clk_ahb = sdhci_arasan->clk_ahb;
292 if (!IS_ERR(sdhci_arasan->phy)) {
293 phy_power_off(sdhci_arasan->phy);
294 phy_exit(sdhci_arasan->phy);
297 ret = sdhci_pltfm_unregister(pdev);
299 clk_disable_unprepare(clk_ahb);
304 static const struct of_device_id sdhci_arasan_of_match[] = {
305 { .compatible = "arasan,sdhci-8.9a" },
306 { .compatible = "arasan,sdhci-5.1" },
307 { .compatible = "arasan,sdhci-4.9a" },
310 MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
312 static struct platform_driver sdhci_arasan_driver = {
314 .name = "sdhci-arasan",
315 .of_match_table = sdhci_arasan_of_match,
316 .pm = &sdhci_arasan_dev_pm_ops,
318 .probe = sdhci_arasan_probe,
319 .remove = sdhci_arasan_remove,
322 module_platform_driver(sdhci_arasan_driver);
324 MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
325 MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
326 MODULE_LICENSE("GPL");