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 "sdhci-pltfm.h"
25 #define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c
27 #define CLK_CTRL_TIMEOUT_SHIFT 16
28 #define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT)
29 #define CLK_CTRL_TIMEOUT_MIN_EXP 13
32 * struct sdhci_arasan_data
33 * @clk_ahb: Pointer to the AHB clock
35 struct sdhci_arasan_data {
39 static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
43 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
45 div = readl(host->ioaddr + SDHCI_ARASAN_CLK_CTRL_OFFSET);
46 div = (div & CLK_CTRL_TIMEOUT_MASK) >> CLK_CTRL_TIMEOUT_SHIFT;
48 freq = clk_get_rate(pltfm_host->clk);
49 freq /= 1 << (CLK_CTRL_TIMEOUT_MIN_EXP + div);
54 static struct sdhci_ops sdhci_arasan_ops = {
55 .set_clock = sdhci_set_clock,
56 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
57 .get_timeout_clock = sdhci_arasan_get_timeout_clock,
58 .set_bus_width = sdhci_set_bus_width,
60 .set_uhs_signaling = sdhci_set_uhs_signaling,
63 static struct sdhci_pltfm_data sdhci_arasan_pdata = {
64 .ops = &sdhci_arasan_ops,
67 #ifdef CONFIG_PM_SLEEP
69 * sdhci_arasan_suspend - Suspend method for the driver
70 * @dev: Address of the device structure
71 * Returns 0 on success and error value on error
73 * Put the device in a low power state.
75 static int sdhci_arasan_suspend(struct device *dev)
77 struct platform_device *pdev = to_platform_device(dev);
78 struct sdhci_host *host = platform_get_drvdata(pdev);
79 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
80 struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
83 ret = sdhci_suspend_host(host);
87 clk_disable(pltfm_host->clk);
88 clk_disable(sdhci_arasan->clk_ahb);
94 * sdhci_arasan_resume - Resume method for the driver
95 * @dev: Address of the device structure
96 * Returns 0 on success and error value on error
98 * Resume operation after suspend
100 static int sdhci_arasan_resume(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 = clk_enable(sdhci_arasan->clk_ahb);
110 dev_err(dev, "Cannot enable AHB clock.\n");
114 ret = clk_enable(pltfm_host->clk);
116 dev_err(dev, "Cannot enable SD clock.\n");
117 clk_disable(sdhci_arasan->clk_ahb);
121 return sdhci_resume_host(host);
123 #endif /* ! CONFIG_PM_SLEEP */
125 static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
126 sdhci_arasan_resume);
128 static int sdhci_arasan_probe(struct platform_device *pdev)
132 struct sdhci_host *host;
133 struct sdhci_pltfm_host *pltfm_host;
134 struct sdhci_arasan_data *sdhci_arasan;
136 sdhci_arasan = devm_kzalloc(&pdev->dev, sizeof(*sdhci_arasan),
141 sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
142 if (IS_ERR(sdhci_arasan->clk_ahb)) {
143 dev_err(&pdev->dev, "clk_ahb clock not found.\n");
144 return PTR_ERR(sdhci_arasan->clk_ahb);
147 clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
148 if (IS_ERR(clk_xin)) {
149 dev_err(&pdev->dev, "clk_xin clock not found.\n");
150 return PTR_ERR(clk_xin);
153 ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
155 dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
159 ret = clk_prepare_enable(clk_xin);
161 dev_err(&pdev->dev, "Unable to enable SD clock.\n");
165 host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, 0);
168 goto clk_disable_all;
171 sdhci_get_of_property(pdev);
172 pltfm_host = sdhci_priv(host);
173 pltfm_host->priv = sdhci_arasan;
174 pltfm_host->clk = clk_xin;
176 ret = mmc_of_parse(host->mmc);
178 dev_err(&pdev->dev, "parsing dt failed (%u)\n", ret);
179 goto clk_disable_all;
182 ret = sdhci_add_host(host);
189 sdhci_pltfm_free(pdev);
191 clk_disable_unprepare(clk_xin);
193 clk_disable_unprepare(sdhci_arasan->clk_ahb);
198 static int sdhci_arasan_remove(struct platform_device *pdev)
200 struct sdhci_host *host = platform_get_drvdata(pdev);
201 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
202 struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
204 clk_disable_unprepare(sdhci_arasan->clk_ahb);
206 return sdhci_pltfm_unregister(pdev);
209 static const struct of_device_id sdhci_arasan_of_match[] = {
210 { .compatible = "arasan,sdhci-8.9a" },
213 MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
215 static struct platform_driver sdhci_arasan_driver = {
217 .name = "sdhci-arasan",
218 .of_match_table = sdhci_arasan_of_match,
219 .pm = &sdhci_arasan_dev_pm_ops,
221 .probe = sdhci_arasan_probe,
222 .remove = sdhci_arasan_remove,
225 module_platform_driver(sdhci_arasan_driver);
227 MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
228 MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
229 MODULE_LICENSE("GPL");