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Soren Brinkmanne3ec3a32013-12-02 10:02:36 -08001/*
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.
7 *
8 * Based on sdhci-of-esdhc.c
9 *
10 * Copyright (c) 2007 Freescale Semiconductor, Inc.
11 * Copyright (c) 2009 MontaVista Software, Inc.
12 *
13 * Authors: Xiaobo Xie <X.Xie@freescale.com>
14 * Anton Vorontsov <avorontsov@ru.mvista.com>
15 *
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.
20 */
21
22#include <linux/module.h>
23#include "sdhci-pltfm.h"
24
25#define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c
26
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
30
31/**
32 * struct sdhci_arasan_data
33 * @clk_ahb: Pointer to the AHB clock
34 */
35struct sdhci_arasan_data {
36 struct clk *clk_ahb;
37};
38
39static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
40{
41 u32 div;
42 unsigned long freq;
43 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
44
45 div = readl(host->ioaddr + SDHCI_ARASAN_CLK_CTRL_OFFSET);
46 div = (div & CLK_CTRL_TIMEOUT_MASK) >> CLK_CTRL_TIMEOUT_SHIFT;
47
48 freq = clk_get_rate(pltfm_host->clk);
49 freq /= 1 << (CLK_CTRL_TIMEOUT_MIN_EXP + div);
50
51 return freq;
52}
53
54static struct sdhci_ops sdhci_arasan_ops = {
55 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
56 .get_timeout_clock = sdhci_arasan_get_timeout_clock,
Russell King2317f562014-04-25 12:57:07 +010057 .set_bus_width = sdhci_set_bus_width,
Soren Brinkmanne3ec3a32013-12-02 10:02:36 -080058};
59
60static struct sdhci_pltfm_data sdhci_arasan_pdata = {
61 .ops = &sdhci_arasan_ops,
62};
63
64#ifdef CONFIG_PM_SLEEP
65/**
66 * sdhci_arasan_suspend - Suspend method for the driver
67 * @dev: Address of the device structure
68 * Returns 0 on success and error value on error
69 *
70 * Put the device in a low power state.
71 */
72static int sdhci_arasan_suspend(struct device *dev)
73{
74 struct platform_device *pdev = to_platform_device(dev);
75 struct sdhci_host *host = platform_get_drvdata(pdev);
76 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
77 struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
78 int ret;
79
80 ret = sdhci_suspend_host(host);
81 if (ret)
82 return ret;
83
84 clk_disable(pltfm_host->clk);
85 clk_disable(sdhci_arasan->clk_ahb);
86
87 return 0;
88}
89
90/**
91 * sdhci_arasan_resume - Resume method for the driver
92 * @dev: Address of the device structure
93 * Returns 0 on success and error value on error
94 *
95 * Resume operation after suspend
96 */
97static int sdhci_arasan_resume(struct device *dev)
98{
99 struct platform_device *pdev = to_platform_device(dev);
100 struct sdhci_host *host = platform_get_drvdata(pdev);
101 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
102 struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
103 int ret;
104
105 ret = clk_enable(sdhci_arasan->clk_ahb);
106 if (ret) {
107 dev_err(dev, "Cannot enable AHB clock.\n");
108 return ret;
109 }
110
111 ret = clk_enable(pltfm_host->clk);
112 if (ret) {
113 dev_err(dev, "Cannot enable SD clock.\n");
114 clk_disable(sdhci_arasan->clk_ahb);
115 return ret;
116 }
117
118 return sdhci_resume_host(host);
119}
120#endif /* ! CONFIG_PM_SLEEP */
121
122static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
123 sdhci_arasan_resume);
124
125static int sdhci_arasan_probe(struct platform_device *pdev)
126{
127 int ret;
128 struct clk *clk_xin;
129 struct sdhci_host *host;
130 struct sdhci_pltfm_host *pltfm_host;
131 struct sdhci_arasan_data *sdhci_arasan;
132
133 sdhci_arasan = devm_kzalloc(&pdev->dev, sizeof(*sdhci_arasan),
134 GFP_KERNEL);
135 if (!sdhci_arasan)
136 return -ENOMEM;
137
138 sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
139 if (IS_ERR(sdhci_arasan->clk_ahb)) {
140 dev_err(&pdev->dev, "clk_ahb clock not found.\n");
141 return PTR_ERR(sdhci_arasan->clk_ahb);
142 }
143
144 clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
145 if (IS_ERR(clk_xin)) {
146 dev_err(&pdev->dev, "clk_xin clock not found.\n");
147 return PTR_ERR(clk_xin);
148 }
149
150 ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
151 if (ret) {
152 dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
153 return ret;
154 }
155
156 ret = clk_prepare_enable(clk_xin);
157 if (ret) {
158 dev_err(&pdev->dev, "Unable to enable SD clock.\n");
159 goto clk_dis_ahb;
160 }
161
162 host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, 0);
163 if (IS_ERR(host)) {
164 ret = PTR_ERR(host);
165 dev_err(&pdev->dev, "platform init failed (%u)\n", ret);
166 goto clk_disable_all;
167 }
168
169 sdhci_get_of_property(pdev);
170 pltfm_host = sdhci_priv(host);
171 pltfm_host->priv = sdhci_arasan;
172 pltfm_host->clk = clk_xin;
173
174 ret = sdhci_add_host(host);
175 if (ret) {
176 dev_err(&pdev->dev, "platform register failed (%u)\n", ret);
177 goto err_pltfm_free;
178 }
179
180 return 0;
181
182err_pltfm_free:
183 sdhci_pltfm_free(pdev);
184clk_disable_all:
185 clk_disable_unprepare(clk_xin);
186clk_dis_ahb:
187 clk_disable_unprepare(sdhci_arasan->clk_ahb);
188
189 return ret;
190}
191
192static int sdhci_arasan_remove(struct platform_device *pdev)
193{
194 struct sdhci_host *host = platform_get_drvdata(pdev);
195 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
196 struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
197
198 clk_disable_unprepare(pltfm_host->clk);
199 clk_disable_unprepare(sdhci_arasan->clk_ahb);
200
201 return sdhci_pltfm_unregister(pdev);
202}
203
204static const struct of_device_id sdhci_arasan_of_match[] = {
205 { .compatible = "arasan,sdhci-8.9a" },
206 { }
207};
208MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
209
210static struct platform_driver sdhci_arasan_driver = {
211 .driver = {
212 .name = "sdhci-arasan",
213 .owner = THIS_MODULE,
214 .of_match_table = sdhci_arasan_of_match,
215 .pm = &sdhci_arasan_dev_pm_ops,
216 },
217 .probe = sdhci_arasan_probe,
218 .remove = sdhci_arasan_remove,
219};
220
221module_platform_driver(sdhci_arasan_driver);
222
223MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
224MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
225MODULE_LICENSE("GPL");