summaryrefslogtreecommitdiffstats
path: root/drivers/clk/samsung/clk-exynos5-subcmu.c
blob: 8ae44b5db4c2f59dbdb821e0564e6e82c6a5efd2 (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
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2018 Samsung Electronics Co., Ltd.
// Author: Marek Szyprowski <m.szyprowski@samsung.com>
// Common Clock Framework support for Exynos5 power-domain dependent clocks

#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>

#include "clk.h"
#include "clk-exynos5-subcmu.h"

static struct samsung_clk_provider *ctx;
static const struct exynos5_subcmu_info *cmu;
static int nr_cmus;

static void exynos5_subcmu_clk_save(void __iomem *base,
				    struct exynos5_subcmu_reg_dump *rd,
				    unsigned int num_regs)
{
	for (; num_regs > 0; --num_regs, ++rd) {
		rd->save = readl(base + rd->offset);
		writel((rd->save & ~rd->mask) | rd->value, base + rd->offset);
		rd->save &= rd->mask;
	}
};

static void exynos5_subcmu_clk_restore(void __iomem *base,
				       struct exynos5_subcmu_reg_dump *rd,
				       unsigned int num_regs)
{
	for (; num_regs > 0; --num_regs, ++rd)
		writel((readl(base + rd->offset) & ~rd->mask) | rd->save,
		       base + rd->offset);
}

static void exynos5_subcmu_defer_gate(struct samsung_clk_provider *ctx,
			      const struct samsung_gate_clock *list, int nr_clk)
{
	while (nr_clk--)
		samsung_clk_add_lookup(ctx, ERR_PTR(-EPROBE_DEFER), list++->id);
}

/*
 * Pass the needed clock provider context and register sub-CMU clocks
 *
 * NOTE: This function has to be called from the main, OF_CLK_DECLARE-
 * initialized clock provider driver. This happens very early during boot
 * process. Then this driver, during core_initcall registers two platform
 * drivers: one which binds to the same device-tree node as OF_CLK_DECLARE
 * driver and second, for handling its per-domain child-devices. Those
 * platform drivers are bound to their devices a bit later in arch_initcall,
 * when OF-core populates all device-tree nodes.
 */
void exynos5_subcmus_init(struct samsung_clk_provider *_ctx, int _nr_cmus,
			  const struct exynos5_subcmu_info *_cmu)
{
	ctx = _ctx;
	cmu = _cmu;
	nr_cmus = _nr_cmus;

	for (; _nr_cmus--; _cmu++) {
		exynos5_subcmu_defer_gate(ctx, _cmu->gate_clks,
					  _cmu->nr_gate_clks);
		exynos5_subcmu_clk_save(ctx->reg_base, _cmu->suspend_regs,
					_cmu->nr_suspend_regs);
	}
}

static int __maybe_unused exynos5_subcmu_suspend(struct device *dev)
{
	struct exynos5_subcmu_info *info = dev_get_drvdata(dev);
	unsigned long flags;

	spin_lock_irqsave(&ctx->lock, flags);
	exynos5_subcmu_clk_save(ctx->reg_base, info->suspend_regs,
				info->nr_suspend_regs);
	spin_unlock_irqrestore(&ctx->lock, flags);

	return 0;
}

static int __maybe_unused exynos5_subcmu_resume(struct device *dev)
{
	struct exynos5_subcmu_info *info = dev_get_drvdata(dev);
	unsigned long flags;

	spin_lock_irqsave(&ctx->lock, flags);
	exynos5_subcmu_clk_restore(ctx->reg_base, info->suspend_regs,
				   info->nr_suspend_regs);
	spin_unlock_irqrestore(&ctx->lock, flags);

	return 0;
}

static int __init exynos5_subcmu_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct exynos5_subcmu_info *info = dev_get_drvdata(dev);

	pm_runtime_set_suspended(dev);
	pm_runtime_enable(dev);
	pm_runtime_get(dev);

	ctx->dev = dev;
	samsung_clk_register_div(ctx, info->div_clks, info->nr_div_clks);
	samsung_clk_register_gate(ctx, info->gate_clks, info->nr_gate_clks);
	ctx->dev = NULL;

	pm_runtime_put_sync(dev);

	return 0;
}

static const struct dev_pm_ops exynos5_subcmu_pm_ops = {
	SET_RUNTIME_PM_OPS(exynos5_subcmu_suspend,
			   exynos5_subcmu_resume, NULL)
	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
				     pm_runtime_force_resume)
};

static struct platform_driver exynos5_subcmu_driver __refdata = {
	.driver	= {
		.name = "exynos5-subcmu",
		.suppress_bind_attrs = true,
		.pm = &exynos5_subcmu_pm_ops,
	},
	.probe = exynos5_subcmu_probe,
};

static int __init exynos5_clk_register_subcmu(struct device *parent,
					 const struct exynos5_subcmu_info *info,
					      struct device_node *pd_node)
{
	struct of_phandle_args genpdspec = { .np = pd_node };
	struct platform_device *pdev;
	int ret;

	pdev = platform_device_alloc("exynos5-subcmu", PLATFORM_DEVID_AUTO);
	if (!pdev)
		return -ENOMEM;

	pdev->dev.parent = parent;
	platform_set_drvdata(pdev, (void *)info);
	of_genpd_add_device(&genpdspec, &pdev->dev);
	ret = platform_device_add(pdev);
	if (ret)
		platform_device_put(pdev);

	return ret;
}

static int __init exynos5_clk_probe(struct platform_device *pdev)
{
	struct device_node *np;
	const char *name;
	int i;

	for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
		if (of_property_read_string(np, "label", &name) < 0)
			continue;
		for (i = 0; i < nr_cmus; i++)
			if (strcmp(cmu[i].pd_name, name) == 0)
				exynos5_clk_register_subcmu(&pdev->dev,
							    &cmu[i], np);
	}
	return 0;
}

static const struct of_device_id exynos5_clk_of_match[] = {
	{ .compatible = "samsung,exynos5250-clock", },
	{ .compatible = "samsung,exynos5420-clock", },
	{ .compatible = "samsung,exynos5800-clock", },
	{ },
};

static struct platform_driver exynos5_clk_driver __refdata = {
	.driver	= {
		.name = "exynos5-clock",
		.of_match_table = exynos5_clk_of_match,
		.suppress_bind_attrs = true,
	},
	.probe = exynos5_clk_probe,
};

static int __init exynos5_clk_drv_init(void)
{
	platform_driver_register(&exynos5_clk_driver);
	platform_driver_register(&exynos5_subcmu_driver);
	return 0;
}
core_initcall(exynos5_clk_drv_init);