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
= sdhci_add_host(host
);
183 sdhci_pltfm_free(pdev
);
185 clk_disable_unprepare(clk_xin
);
187 clk_disable_unprepare(sdhci_arasan
->clk_ahb
);
192 static int sdhci_arasan_remove(struct platform_device
*pdev
)
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
;
198 clk_disable_unprepare(pltfm_host
->clk
);
199 clk_disable_unprepare(sdhci_arasan
->clk_ahb
);
201 return sdhci_pltfm_unregister(pdev
);
204 static const struct of_device_id sdhci_arasan_of_match
[] = {
205 { .compatible
= "arasan,sdhci-8.9a" },
208 MODULE_DEVICE_TABLE(of
, sdhci_arasan_of_match
);
210 static struct platform_driver sdhci_arasan_driver
= {
212 .name
= "sdhci-arasan",
213 .of_match_table
= sdhci_arasan_of_match
,
214 .pm
= &sdhci_arasan_dev_pm_ops
,
216 .probe
= sdhci_arasan_probe
,
217 .remove
= sdhci_arasan_remove
,
220 module_platform_driver(sdhci_arasan_driver
);
222 MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
223 MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
224 MODULE_LICENSE("GPL");