aboutsummaryrefslogtreecommitdiff
path: root/drivers/mmc/host/sdhci-dove.c
blob: b514f68d6f1b608ff6edce0edd48b8aa6cb68880 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
/*
 * sdhci-dove.c Support for SDHCI on Marvell's Dove SoC
 *
 * Author: Saeed Bishara <saeed@marvell.com>
 *	   Mike Rapoport <mike@compulab.co.il>
 * Based on sdhci-cns3xxx.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>

#include "sdhci-pltfm.h"

struct sdhci_dove_priv {
	struct clk *clk;
	int gpio_cd;
};

static irqreturn_t sdhci_dove_carddetect_irq(int irq, void *data)
{
	struct sdhci_host *host = data;

	tasklet_schedule(&host->card_tasklet);
	return IRQ_HANDLED;
}

static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
{
	u16 ret;

	switch (reg) {
	case SDHCI_HOST_VERSION:
	case SDHCI_SLOT_INT_STATUS:
		/* those registers don't exist */
		return 0;
	default:
		ret = readw(host->ioaddr + reg);
	}
	return ret;
}

static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_dove_priv *priv = pltfm_host->priv;
	u32 ret;

	ret = readl(host->ioaddr + reg);

	switch (reg) {
	case SDHCI_CAPABILITIES:
		/* Mask the support for 3.0V */
		ret &= ~SDHCI_CAN_VDD_300;
		break;
	case SDHCI_PRESENT_STATE:
		if (gpio_is_valid(priv->gpio_cd)) {
			if (gpio_get_value(priv->gpio_cd) == 0)
				ret |= SDHCI_CARD_PRESENT;
			else
				ret &= ~SDHCI_CARD_PRESENT;
		}
		break;
	}
	return ret;
}

static struct sdhci_ops sdhci_dove_ops = {
	.read_w	= sdhci_dove_readw,
	.read_l	= sdhci_dove_readl,
};

static const struct sdhci_pltfm_data sdhci_dove_pdata = {
	.ops	= &sdhci_dove_ops,
	.quirks	= SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
		  SDHCI_QUIRK_NO_BUSY_IRQ |
		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
		  SDHCI_QUIRK_FORCE_DMA |
		  SDHCI_QUIRK_NO_HISPD_BIT,
};

static int sdhci_dove_probe(struct platform_device *pdev)
{
	struct sdhci_host *host;
	struct sdhci_pltfm_host *pltfm_host;
	struct sdhci_dove_priv *priv;
	int ret;

	priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv),
			    GFP_KERNEL);
	if (!priv) {
		dev_err(&pdev->dev, "unable to allocate private data");
		return -ENOMEM;
	}

	priv->clk = devm_clk_get(&pdev->dev, NULL);

	if (pdev->dev.of_node) {
		priv->gpio_cd = of_get_named_gpio(pdev->dev.of_node,
						  "cd-gpios", 0);
	} else {
		priv->gpio_cd = -EINVAL;
	}

	if (gpio_is_valid(priv->gpio_cd)) {
		ret = gpio_request(priv->gpio_cd, "sdhci-cd");
		if (ret) {
			dev_err(&pdev->dev, "card detect gpio request failed: %d\n",
				ret);
			return ret;
		}
		gpio_direction_input(priv->gpio_cd);
	}

	host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata);
	if (IS_ERR(host)) {
		ret = PTR_ERR(host);
		goto err_sdhci_pltfm_init;
	}

	pltfm_host = sdhci_priv(host);
	pltfm_host->priv = priv;

	if (!IS_ERR(priv->clk))
		clk_prepare_enable(priv->clk);

	sdhci_get_of_property(pdev);

	ret = sdhci_add_host(host);
	if (ret)
		goto err_sdhci_add;

	/*
	 * We must request the IRQ after sdhci_add_host(), as the tasklet only
	 * gets setup in sdhci_add_host() and we oops.
	 */
	if (gpio_is_valid(priv->gpio_cd)) {
		ret = request_irq(gpio_to_irq(priv->gpio_cd),
				  sdhci_dove_carddetect_irq,
				  IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
				  mmc_hostname(host->mmc), host);
		if (ret) {
			dev_err(&pdev->dev, "card detect irq request failed: %d\n",
				ret);
			goto err_request_irq;
		}
	}

	return 0;

err_request_irq:
	sdhci_remove_host(host, 0);
err_sdhci_add:
	if (!IS_ERR(priv->clk))
		clk_disable_unprepare(priv->clk);
	sdhci_pltfm_free(pdev);
err_sdhci_pltfm_init:
	if (gpio_is_valid(priv->gpio_cd))
		gpio_free(priv->gpio_cd);
	return ret;
}

static int sdhci_dove_remove(struct platform_device *pdev)
{
	struct sdhci_host *host = platform_get_drvdata(pdev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_dove_priv *priv = pltfm_host->priv;

	sdhci_pltfm_unregister(pdev);

	if (gpio_is_valid(priv->gpio_cd)) {
		free_irq(gpio_to_irq(priv->gpio_cd), host);
		gpio_free(priv->gpio_cd);
	}

	if (!IS_ERR(priv->clk))
		clk_disable_unprepare(priv->clk);

	return 0;
}

static const struct of_device_id sdhci_dove_of_match_table[] = {
	{ .compatible = "marvell,dove-sdhci", },
	{}
};
MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);

static struct platform_driver sdhci_dove_driver = {
	.driver		= {
		.name	= "sdhci-dove",
		.owner	= THIS_MODULE,
		.pm	= SDHCI_PLTFM_PMOPS,
		.of_match_table = of_match_ptr(sdhci_dove_of_match_table),
	},
	.probe		= sdhci_dove_probe,
	.remove		= sdhci_dove_remove,
};

module_platform_driver(sdhci_dove_driver);

MODULE_DESCRIPTION("SDHCI driver for Dove");
MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
	      "Mike Rapoport <mike@compulab.co.il>");
MODULE_LICENSE("GPL v2");