summaryrefslogtreecommitdiffstats
path: root/drivers/mmc/host/tmio_mmc.c
blob: 53a2ad9a24b87a858f802c533e5cc095b468b6f7 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for the MMC / SD / SDIO cell found in:
 *
 * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
 *
 * Copyright (C) 2017 Renesas Electronics Corporation
 * Copyright (C) 2017 Horms Solutions, Simon Horman
 * Copyright (C) 2007 Ian Molton
 * Copyright (C) 2004 Ian Molton
 */

#include <linux/delay.h>
#include <linux/device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/scatterlist.h>

#include "tmio_mmc.h"

/* Registers specific to this variant */
#define CTL_SDIO_REGS		0x100
#define CTL_CLK_AND_WAIT_CTL	0x138
#define CTL_RESET_SDIO		0x1e0

static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
{
	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
		sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));

	usleep_range(10000, 11000);
	sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
	usleep_range(10000, 11000);
}

static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
{
	sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
	usleep_range(10000, 11000);

	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
		sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));

	usleep_range(10000, 11000);
}

static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
			       unsigned int new_clock)
{
	unsigned int divisor;
	u32 clk = 0;
	int clk_sel;

	if (new_clock == 0) {
		tmio_mmc_clk_stop(host);
		return;
	}

	divisor = host->pdata->hclk / new_clock;

	/* bit7 set: 1/512, ... bit0 set: 1/4, all bits clear: 1/2 */
	clk_sel = (divisor <= 1);
	clk = clk_sel ? 0 : (roundup_pow_of_two(divisor) >> 2);

	host->pdata->set_clk_div(host->pdev, clk_sel);

	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
			sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
	usleep_range(10000, 11000);

	tmio_mmc_clk_start(host);
}

static void tmio_mmc_reset(struct tmio_mmc_host *host, bool preserve)
{
	sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
	usleep_range(10000, 11000);
	sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
	usleep_range(10000, 11000);
}

#ifdef CONFIG_PM_SLEEP
static int tmio_mmc_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	const struct mfd_cell *cell = mfd_get_cell(pdev);
	int ret;

	ret = pm_runtime_force_suspend(dev);

	/* Tell MFD core it can disable us now.*/
	if (!ret && cell->disable)
		cell->disable(pdev);

	return ret;
}

static int tmio_mmc_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	const struct mfd_cell *cell = mfd_get_cell(pdev);
	int ret = 0;

	/* Tell the MFD core we are ready to be enabled */
	if (cell->resume)
		ret = cell->resume(pdev);

	if (!ret)
		ret = pm_runtime_force_resume(dev);

	return ret;
}
#endif

static int tmio_mmc_probe(struct platform_device *pdev)
{
	const struct mfd_cell *cell = mfd_get_cell(pdev);
	struct tmio_mmc_data *pdata;
	struct tmio_mmc_host *host;
	struct resource *res;
	int ret = -EINVAL, irq;

	if (pdev->num_resources != 2)
		goto out;

	pdata = pdev->dev.platform_data;
	if (!pdata || !pdata->hclk)
		goto out;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		ret = irq;
		goto out;
	}

	/* Tell the MFD core we are ready to be enabled */
	if (cell->enable) {
		ret = cell->enable(pdev);
		if (ret)
			goto out;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		ret = -EINVAL;
		goto cell_disable;
	}

	host = tmio_mmc_host_alloc(pdev, pdata);
	if (IS_ERR(host)) {
		ret = PTR_ERR(host);
		goto cell_disable;
	}

	/* SD control register space size is 0x200, 0x400 for bus_shift=1 */
	host->bus_shift = resource_size(res) >> 10;
	host->set_clock = tmio_mmc_set_clock;
	host->reset = tmio_mmc_reset;

	host->mmc->f_max = pdata->hclk;
	host->mmc->f_min = pdata->hclk / 512;

	ret = tmio_mmc_host_probe(host);
	if (ret)
		goto host_free;

	ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq,
			       IRQF_TRIGGER_FALLING,
			       dev_name(&pdev->dev), host);
	if (ret)
		goto host_remove;

	pr_info("%s at 0x%p irq %d\n", mmc_hostname(host->mmc), host->ctl, irq);

	return 0;

host_remove:
	tmio_mmc_host_remove(host);
host_free:
	tmio_mmc_host_free(host);
cell_disable:
	if (cell->disable)
		cell->disable(pdev);
out:
	return ret;
}

static int tmio_mmc_remove(struct platform_device *pdev)
{
	const struct mfd_cell *cell = mfd_get_cell(pdev);
	struct tmio_mmc_host *host = platform_get_drvdata(pdev);

	tmio_mmc_host_remove(host);
	if (cell->disable)
		cell->disable(pdev);

	return 0;
}

/* ------------------- device registration ----------------------- */

static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume)
	SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
			   tmio_mmc_host_runtime_resume, NULL)
};

static struct platform_driver tmio_mmc_driver = {
	.driver = {
		.name = "tmio-mmc",
		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
		.pm = &tmio_mmc_dev_pm_ops,
	},
	.probe = tmio_mmc_probe,
	.remove = tmio_mmc_remove,
};

module_platform_driver(tmio_mmc_driver);

MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tmio-mmc");