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 "sdhci-pltfm.h"
26 #define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c
28 #define CLK_CTRL_TIMEOUT_SHIFT 16
29 #define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT)
30 #define CLK_CTRL_TIMEOUT_MIN_EXP 13
33 * struct sdhci_arasan_data
34 * @clk_ahb: Pointer to the AHB clock
36 struct sdhci_arasan_data {
40 static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
44 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
46 div = readl(host->ioaddr + SDHCI_ARASAN_CLK_CTRL_OFFSET);
47 div = (div & CLK_CTRL_TIMEOUT_MASK) >> CLK_CTRL_TIMEOUT_SHIFT;
49 freq = clk_get_rate(pltfm_host->clk);
50 freq /= 1 << (CLK_CTRL_TIMEOUT_MIN_EXP + div);
55 static struct sdhci_ops sdhci_arasan_ops = {
56 .set_clock = sdhci_set_clock,
57 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
58 .get_timeout_clock = sdhci_arasan_get_timeout_clock,
59 .set_bus_width = sdhci_set_bus_width,
61 .set_uhs_signaling = sdhci_set_uhs_signaling,
64 static struct sdhci_pltfm_data sdhci_arasan_pdata = {
65 .ops = &sdhci_arasan_ops,
68 #ifdef CONFIG_PM_SLEEP
70 * sdhci_arasan_suspend - Suspend method for the driver
71 * @dev: Address of the device structure
72 * Returns 0 on success and error value on error
74 * Put the device in a low power state.
76 static int sdhci_arasan_suspend(struct device *dev)
78 struct platform_device *pdev = to_platform_device(dev);
79 struct sdhci_host *host = platform_get_drvdata(pdev);
80 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
81 struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
84 ret = sdhci_suspend_host(host);
88 clk_disable(pltfm_host->clk);
89 clk_disable(sdhci_arasan->clk_ahb);
95 * sdhci_arasan_resume - Resume method for the driver
96 * @dev: Address of the device structure
97 * Returns 0 on success and error value on error
99 * Resume operation after suspend
101 static int sdhci_arasan_resume(struct device *dev)
103 struct platform_device *pdev = to_platform_device(dev);
104 struct sdhci_host *host = platform_get_drvdata(pdev);
105 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
106 struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
109 ret = clk_enable(sdhci_arasan->clk_ahb);
111 dev_err(dev, "Cannot enable AHB clock.\n");
115 ret = clk_enable(pltfm_host->clk);
117 dev_err(dev, "Cannot enable SD clock.\n");
118 clk_disable(sdhci_arasan->clk_ahb);
122 return sdhci_resume_host(host);
124 #endif /* ! CONFIG_PM_SLEEP */
126 static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
127 sdhci_arasan_resume);
129 static int sdhci_arasan_probe(struct platform_device *pdev)
133 struct sdhci_host *host;
134 struct sdhci_pltfm_host *pltfm_host;
135 struct sdhci_arasan_data *sdhci_arasan;
137 sdhci_arasan = devm_kzalloc(&pdev->dev, sizeof(*sdhci_arasan),
142 sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
143 if (IS_ERR(sdhci_arasan->clk_ahb)) {
144 dev_err(&pdev->dev, "clk_ahb clock not found.\n");
145 return PTR_ERR(sdhci_arasan->clk_ahb);
148 clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
149 if (IS_ERR(clk_xin)) {
150 dev_err(&pdev->dev, "clk_xin clock not found.\n");
151 return PTR_ERR(clk_xin);
154 ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
156 dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
160 ret = clk_prepare_enable(clk_xin);
162 dev_err(&pdev->dev, "Unable to enable SD clock.\n");
166 host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, 0);
169 goto clk_disable_all;
172 if (of_device_is_compatible(pdev->dev.of_node, "arasan,sdhci-4.9a")) {
173 host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
174 host->quirks2 |= SDHCI_QUIRK2_HOST_NO_CMD23;
177 sdhci_get_of_property(pdev);
178 pltfm_host = sdhci_priv(host);
179 pltfm_host->priv = sdhci_arasan;
180 pltfm_host->clk = clk_xin;
182 ret = mmc_of_parse(host->mmc);
184 dev_err(&pdev->dev, "parsing dt failed (%u)\n", ret);
185 goto clk_disable_all;
188 ret = sdhci_add_host(host);
195 sdhci_pltfm_free(pdev);
197 clk_disable_unprepare(clk_xin);
199 clk_disable_unprepare(sdhci_arasan->clk_ahb);
204 static int sdhci_arasan_remove(struct platform_device *pdev)
206 struct sdhci_host *host = platform_get_drvdata(pdev);
207 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
208 struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
210 clk_disable_unprepare(sdhci_arasan->clk_ahb);
212 return sdhci_pltfm_unregister(pdev);
215 static const struct of_device_id sdhci_arasan_of_match[] = {
216 { .compatible = "arasan,sdhci-8.9a" },
217 { .compatible = "arasan,sdhci-4.9a" },
220 MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
222 static struct platform_driver sdhci_arasan_driver = {
224 .name = "sdhci-arasan",
225 .of_match_table = sdhci_arasan_of_match,
226 .pm = &sdhci_arasan_dev_pm_ops,
228 .probe = sdhci_arasan_probe,
229 .remove = sdhci_arasan_remove,
232 module_platform_driver(sdhci_arasan_driver);
234 MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
235 MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
236 MODULE_LICENSE("GPL");