summaryrefslogtreecommitdiffstats
path: root/drivers/mmc/host/sdhci-tegra.c
blob: f7e1f964395fd5bb46264e98c0e474046204293b (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
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
/*
 * Copyright (C) 2010 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 */

#include <linux/err.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>

#include <mach/gpio.h>
#include <mach/sdhci.h>

#include "sdhci.h"
#include "sdhci-pltfm.h"

static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg)
{
	u32 val;

	if (unlikely(reg == SDHCI_PRESENT_STATE)) {
		/* Use wp_gpio here instead? */
		val = readl(host->ioaddr + reg);
		return val | SDHCI_WRITE_PROTECT;
	}

	return readl(host->ioaddr + reg);
}

static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
{
	if (unlikely(reg == SDHCI_HOST_VERSION)) {
		/* Erratum: Version register is invalid in HW. */
		return SDHCI_SPEC_200;
	}

	return readw(host->ioaddr + reg);
}

static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
{
	/* Seems like we're getting spurious timeout and crc errors, so
	 * disable signalling of them. In case of real errors software
	 * timers should take care of eventually detecting them.
	 */
	if (unlikely(reg == SDHCI_SIGNAL_ENABLE))
		val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC);

	writel(val, host->ioaddr + reg);

	if (unlikely(reg == SDHCI_INT_ENABLE)) {
		/* Erratum: Must enable block gap interrupt detection */
		u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
		if (val & SDHCI_INT_CARD_INT)
			gap_ctrl |= 0x8;
		else
			gap_ctrl &= ~0x8;
		writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
	}
}

static unsigned int tegra_sdhci_get_ro(struct sdhci_host *sdhci)
{
	struct platform_device *pdev = to_platform_device(mmc_dev(sdhci->mmc));
	struct tegra_sdhci_platform_data *plat;

	plat = pdev->dev.platform_data;

	if (!gpio_is_valid(plat->wp_gpio))
		return -1;

	return gpio_get_value(plat->wp_gpio);
}

static irqreturn_t carddetect_irq(int irq, void *data)
{
	struct sdhci_host *sdhost = (struct sdhci_host *)data;

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

static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
{
	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
	struct tegra_sdhci_platform_data *plat;
	u32 ctrl;

	plat = pdev->dev.platform_data;

	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
	if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
		ctrl &= ~SDHCI_CTRL_4BITBUS;
		ctrl |= SDHCI_CTRL_8BITBUS;
	} else {
		ctrl &= ~SDHCI_CTRL_8BITBUS;
		if (bus_width == MMC_BUS_WIDTH_4)
			ctrl |= SDHCI_CTRL_4BITBUS;
		else
			ctrl &= ~SDHCI_CTRL_4BITBUS;
	}
	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
	return 0;
}


static int tegra_sdhci_pltfm_init(struct sdhci_host *host,
				  struct sdhci_pltfm_data *pdata)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
	struct tegra_sdhci_platform_data *plat;
	struct clk *clk;
	int rc;

	plat = pdev->dev.platform_data;
	if (plat == NULL) {
		dev_err(mmc_dev(host->mmc), "missing platform data\n");
		return -ENXIO;
	}

	if (gpio_is_valid(plat->power_gpio)) {
		rc = gpio_request(plat->power_gpio, "sdhci_power");
		if (rc) {
			dev_err(mmc_dev(host->mmc),
				"failed to allocate power gpio\n");
			goto out;
		}
		tegra_gpio_enable(plat->power_gpio);
		gpio_direction_output(plat->power_gpio, 1);
	}

	if (gpio_is_valid(plat->cd_gpio)) {
		rc = gpio_request(plat->cd_gpio, "sdhci_cd");
		if (rc) {
			dev_err(mmc_dev(host->mmc),
				"failed to allocate cd gpio\n");
			goto out_power;
		}
		tegra_gpio_enable(plat->cd_gpio);
		gpio_direction_input(plat->cd_gpio);

		rc = request_irq(gpio_to_irq(plat->cd_gpio), carddetect_irq,
				 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
				 mmc_hostname(host->mmc), host);

		if (rc)	{
			dev_err(mmc_dev(host->mmc), "request irq error\n");
			goto out_cd;
		}

	}

	if (gpio_is_valid(plat->wp_gpio)) {
		rc = gpio_request(plat->wp_gpio, "sdhci_wp");
		if (rc) {
			dev_err(mmc_dev(host->mmc),
				"failed to allocate wp gpio\n");
			goto out_irq;
		}
		tegra_gpio_enable(plat->wp_gpio);
		gpio_direction_input(plat->wp_gpio);
	}

	clk = clk_get(mmc_dev(host->mmc), NULL);
	if (IS_ERR(clk)) {
		dev_err(mmc_dev(host->mmc), "clk err\n");
		rc = PTR_ERR(clk);
		goto out_wp;
	}
	clk_enable(clk);
	pltfm_host->clk = clk;

	if (plat->is_8bit)
		host->mmc->caps |= MMC_CAP_8_BIT_DATA;

	return 0;

out_wp:
	if (gpio_is_valid(plat->wp_gpio)) {
		tegra_gpio_disable(plat->wp_gpio);
		gpio_free(plat->wp_gpio);
	}

out_irq:
	if (gpio_is_valid(plat->cd_gpio))
		free_irq(gpio_to_irq(plat->cd_gpio), host);
out_cd:
	if (gpio_is_valid(plat->cd_gpio)) {
		tegra_gpio_disable(plat->cd_gpio);
		gpio_free(plat->cd_gpio);
	}

out_power:
	if (gpio_is_valid(plat->power_gpio)) {
		tegra_gpio_disable(plat->power_gpio);
		gpio_free(plat->power_gpio);
	}

out:
	return rc;
}

static void tegra_sdhci_pltfm_exit(struct sdhci_host *host)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
	struct tegra_sdhci_platform_data *plat;

	plat = pdev->dev.platform_data;

	if (gpio_is_valid(plat->wp_gpio)) {
		tegra_gpio_disable(plat->wp_gpio);
		gpio_free(plat->wp_gpio);
	}

	if (gpio_is_valid(plat->cd_gpio)) {
		free_irq(gpio_to_irq(plat->cd_gpio), host);
		tegra_gpio_disable(plat->cd_gpio);
		gpio_free(plat->cd_gpio);
	}

	if (gpio_is_valid(plat->power_gpio)) {
		tegra_gpio_disable(plat->power_gpio);
		gpio_free(plat->power_gpio);
	}

	clk_disable(pltfm_host->clk);
	clk_put(pltfm_host->clk);
}

static struct sdhci_ops tegra_sdhci_ops = {
	.get_ro     = tegra_sdhci_get_ro,
	.read_l     = tegra_sdhci_readl,
	.read_w     = tegra_sdhci_readw,
	.write_l    = tegra_sdhci_writel,
	.platform_8bit_width = tegra_sdhci_8bit,
};

struct sdhci_pltfm_data sdhci_tegra_pdata = {
	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
		  SDHCI_QUIRK_NO_HISPD_BIT |
		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
	.ops  = &tegra_sdhci_ops,
	.init = tegra_sdhci_pltfm_init,
	.exit = tegra_sdhci_pltfm_exit,
};