summaryrefslogtreecommitdiff
path: root/drivers/scsi/ufs/ufshcd-pltfrm.c
blob: 51e47c429a1f0f1d04d5c2cbaa4c4daf371a799b (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
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
/*
 * Universal Flash Storage Host controller Platform bus based glue driver
 *
 * This code is based on drivers/scsi/ufs/ufshcd-pltfrm.c
 * Copyright (C) 2011-2013 Samsung India Software Operations
 *
 * Authors:
 *	Santosh Yaraganavi <santosh.sy@samsung.com>
 *	Vinayak Holikatti <h.vinayak@samsung.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * See the COPYING file in the top-level directory or visit
 * <http://www.gnu.org/licenses/gpl-2.0.html>
 *
 * 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.
 *
 * This program is provided "AS IS" and "WITH ALL FAULTS" and
 * without warranty of any kind. You are solely responsible for
 * determining the appropriateness of using and distributing
 * the program and assume all risks associated with your exercise
 * of rights with respect to the program, including but not limited
 * to infringement of third party rights, the risks and costs of
 * program errors, damage to or loss of data, programs or equipment,
 * and unavailability or interruption of operations. Under no
 * circumstances will the contributor of this Program be liable for
 * any damages of any kind arising from your use or distribution of
 * this program.
 */

#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>

#include "ufshcd.h"

static const struct of_device_id ufs_of_match[];
static struct ufs_hba_variant_ops *get_variant_ops(struct device *dev)
{
	if (dev->of_node) {
		const struct of_device_id *match;

		match = of_match_node(ufs_of_match, dev->of_node);
		if (match)
			return (struct ufs_hba_variant_ops *)match->data;
	}

	return NULL;
}

#define MAX_PROP_SIZE 32
static int ufshcd_populate_vreg(struct device *dev, const char *name,
		struct ufs_vreg **out_vreg)
{
	int ret = 0;
	char prop_name[MAX_PROP_SIZE];
	struct ufs_vreg *vreg = NULL;
	struct device_node *np = dev->of_node;

	if (!np) {
		dev_err(dev, "%s: non DT initialization\n", __func__);
		goto out;
	}

	snprintf(prop_name, MAX_PROP_SIZE, "%s-supply", name);
	if (!of_parse_phandle(np, prop_name, 0)) {
		dev_info(dev, "%s: Unable to find %s regulator, assuming enabled\n",
				__func__, prop_name);
		goto out;
	}

	vreg = devm_kzalloc(dev, sizeof(*vreg), GFP_KERNEL);
	if (!vreg) {
		dev_err(dev, "No memory for %s regulator\n", name);
		goto out;
	}

	vreg->name = kstrdup(name, GFP_KERNEL);

	snprintf(prop_name, MAX_PROP_SIZE, "%s-max-microamp", name);
	ret = of_property_read_u32(np, prop_name, &vreg->max_uA);
	if (ret) {
		dev_err(dev, "%s: unable to find %s err %d\n",
				__func__, prop_name, ret);
		goto out_free;
	}

	vreg->min_uA = 0;
	if (!strcmp(name, "vcc")) {
		if (of_property_read_bool(np, "vcc-supply-1p8")) {
			vreg->min_uV = UFS_VREG_VCC_1P8_MIN_UV;
			vreg->max_uV = UFS_VREG_VCC_1P8_MAX_UV;
		} else {
			vreg->min_uV = UFS_VREG_VCC_MIN_UV;
			vreg->max_uV = UFS_VREG_VCC_MAX_UV;
		}
	} else if (!strcmp(name, "vccq")) {
		vreg->min_uV = UFS_VREG_VCCQ_MIN_UV;
		vreg->max_uV = UFS_VREG_VCCQ_MAX_UV;
	} else if (!strcmp(name, "vccq2")) {
		vreg->min_uV = UFS_VREG_VCCQ2_MIN_UV;
		vreg->max_uV = UFS_VREG_VCCQ2_MAX_UV;
	}

	goto out;

out_free:
	devm_kfree(dev, vreg);
	vreg = NULL;
out:
	if (!ret)
		*out_vreg = vreg;
	return ret;
}

/**
 * ufshcd_parse_regulator_info - get regulator info from device tree
 * @hba: per adapter instance
 *
 * Get regulator info from device tree for vcc, vccq, vccq2 power supplies.
 * If any of the supplies are not defined it is assumed that they are always-on
 * and hence return zero. If the property is defined but parsing is failed
 * then return corresponding error.
 */
static int ufshcd_parse_regulator_info(struct ufs_hba *hba)
{
	int err;
	struct device *dev = hba->dev;
	struct ufs_vreg_info *info = &hba->vreg_info;

	err = ufshcd_populate_vreg(dev, "vcc", &info->vcc);
	if (err)
		goto out;

	err = ufshcd_populate_vreg(dev, "vccq", &info->vccq);
	if (err)
		goto out;

	err = ufshcd_populate_vreg(dev, "vccq2", &info->vccq2);
out:
	return err;
}

#ifdef CONFIG_PM
/**
 * ufshcd_pltfrm_suspend - suspend power management function
 * @dev: pointer to device handle
 *
 *
 * Returns 0
 */
static int ufshcd_pltfrm_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct ufs_hba *hba =  platform_get_drvdata(pdev);

	/*
	 * TODO:
	 * 1. Call ufshcd_suspend
	 * 2. Do bus specific power management
	 */

	disable_irq(hba->irq);

	return 0;
}

/**
 * ufshcd_pltfrm_resume - resume power management function
 * @dev: pointer to device handle
 *
 * Returns 0
 */
static int ufshcd_pltfrm_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct ufs_hba *hba =  platform_get_drvdata(pdev);

	/*
	 * TODO:
	 * 1. Call ufshcd_resume.
	 * 2. Do bus specific wake up
	 */

	enable_irq(hba->irq);

	return 0;
}
#else
#define ufshcd_pltfrm_suspend	NULL
#define ufshcd_pltfrm_resume	NULL
#endif

#ifdef CONFIG_PM_RUNTIME
static int ufshcd_pltfrm_runtime_suspend(struct device *dev)
{
	struct ufs_hba *hba =  dev_get_drvdata(dev);

	if (!hba)
		return 0;

	return ufshcd_runtime_suspend(hba);
}
static int ufshcd_pltfrm_runtime_resume(struct device *dev)
{
	struct ufs_hba *hba =  dev_get_drvdata(dev);

	if (!hba)
		return 0;

	return ufshcd_runtime_resume(hba);
}
static int ufshcd_pltfrm_runtime_idle(struct device *dev)
{
	struct ufs_hba *hba =  dev_get_drvdata(dev);

	if (!hba)
		return 0;

	return ufshcd_runtime_idle(hba);
}
#else /* !CONFIG_PM_RUNTIME */
#define ufshcd_pltfrm_runtime_suspend	NULL
#define ufshcd_pltfrm_runtime_resume	NULL
#define ufshcd_pltfrm_runtime_idle	NULL
#endif /* CONFIG_PM_RUNTIME */

/**
 * ufshcd_pltfrm_probe - probe routine of the driver
 * @pdev: pointer to Platform device handle
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_pltfrm_probe(struct platform_device *pdev)
{
	struct ufs_hba *hba;
	void __iomem *mmio_base;
	struct resource *mem_res;
	int irq, err;
	struct device *dev = &pdev->dev;

	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	mmio_base = devm_ioremap_resource(dev, mem_res);
	if (IS_ERR(*(void **)&mmio_base)) {
		err = PTR_ERR(*(void **)&mmio_base);
		goto out;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(dev, "IRQ resource not available\n");
		err = -ENODEV;
		goto out;
	}

	err = ufshcd_alloc_host(dev, &hba);
	if (err) {
		dev_err(&pdev->dev, "Allocation failed\n");
		goto out;
	}

	hba->vops = get_variant_ops(&pdev->dev);

	err = ufshcd_parse_regulator_info(hba);
	if (err) {
		dev_err(&pdev->dev, "%s: regulator init failed %d\n",
				__func__, err);
		goto out;
	}

	pm_runtime_set_active(&pdev->dev);
	pm_runtime_enable(&pdev->dev);

	err = ufshcd_init(hba, mmio_base, irq);
	if (err) {
		dev_err(dev, "Intialization failed\n");
		goto out_disable_rpm;
	}

	platform_set_drvdata(pdev, hba);

	return 0;

out_disable_rpm:
	pm_runtime_disable(&pdev->dev);
	pm_runtime_set_suspended(&pdev->dev);
out:
	return err;
}

/**
 * ufshcd_pltfrm_remove - remove platform driver routine
 * @pdev: pointer to platform device handle
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_pltfrm_remove(struct platform_device *pdev)
{
	struct ufs_hba *hba =  platform_get_drvdata(pdev);

	pm_runtime_get_sync(&(pdev)->dev);
	ufshcd_remove(hba);
	return 0;
}

static const struct of_device_id ufs_of_match[] = {
	{ .compatible = "jedec,ufs-1.1"},
	{},
};

static const struct dev_pm_ops ufshcd_dev_pm_ops = {
	.suspend	= ufshcd_pltfrm_suspend,
	.resume		= ufshcd_pltfrm_resume,
	.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
	.runtime_resume  = ufshcd_pltfrm_runtime_resume,
	.runtime_idle    = ufshcd_pltfrm_runtime_idle,
};

static struct platform_driver ufshcd_pltfrm_driver = {
	.probe	= ufshcd_pltfrm_probe,
	.remove	= ufshcd_pltfrm_remove,
	.driver	= {
		.name	= "ufshcd",
		.owner	= THIS_MODULE,
		.pm	= &ufshcd_dev_pm_ops,
		.of_match_table = ufs_of_match,
	},
};

module_platform_driver(ufshcd_pltfrm_driver);

MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
MODULE_DESCRIPTION("UFS host controller Pltform bus based glue driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(UFSHCD_DRIVER_VERSION);