summaryrefslogtreecommitdiffstats
path: root/drivers/clk/at91/pmc.c
blob: 5aa9c1f1c8866d20766b80f9616f3ef017970e25 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
 */

#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clk/at91_pmc.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/mfd/syscon.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/syscore_ops.h>

#include <asm/proc-fns.h>

#include "pmc.h"

#define PMC_MAX_IDS 128
#define PMC_MAX_PCKS 8

int of_at91_get_clk_range(struct device_node *np, const char *propname,
			  struct clk_range *range)
{
	u32 min, max;
	int ret;

	ret = of_property_read_u32_index(np, propname, 0, &min);
	if (ret)
		return ret;

	ret = of_property_read_u32_index(np, propname, 1, &max);
	if (ret)
		return ret;

	if (range) {
		range->min = min;
		range->max = max;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(of_at91_get_clk_range);

struct clk_hw *of_clk_hw_pmc_get(struct of_phandle_args *clkspec, void *data)
{
	unsigned int type = clkspec->args[0];
	unsigned int idx = clkspec->args[1];
	struct pmc_data *pmc_data = data;

	switch (type) {
	case PMC_TYPE_CORE:
		if (idx < pmc_data->ncore)
			return pmc_data->chws[idx];
		break;
	case PMC_TYPE_SYSTEM:
		if (idx < pmc_data->nsystem)
			return pmc_data->shws[idx];
		break;
	case PMC_TYPE_PERIPHERAL:
		if (idx < pmc_data->nperiph)
			return pmc_data->phws[idx];
		break;
	case PMC_TYPE_GCK:
		if (idx < pmc_data->ngck)
			return pmc_data->ghws[idx];
		break;
	case PMC_TYPE_PROGRAMMABLE:
		if (idx < pmc_data->npck)
			return pmc_data->pchws[idx];
		break;
	default:
		break;
	}

	pr_err("%s: invalid type (%u) or index (%u)\n", __func__, type, idx);

	return ERR_PTR(-EINVAL);
}

struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
				   unsigned int nperiph, unsigned int ngck,
				   unsigned int npck)
{
	unsigned int num_clks = ncore + nsystem + nperiph + ngck + npck;
	struct pmc_data *pmc_data;

	pmc_data = kzalloc(struct_size(pmc_data, hwtable, num_clks),
			   GFP_KERNEL);
	if (!pmc_data)
		return NULL;

	pmc_data->ncore = ncore;
	pmc_data->chws = pmc_data->hwtable;

	pmc_data->nsystem = nsystem;
	pmc_data->shws = pmc_data->chws + ncore;

	pmc_data->nperiph = nperiph;
	pmc_data->phws = pmc_data->shws + nsystem;

	pmc_data->ngck = ngck;
	pmc_data->ghws = pmc_data->phws + nperiph;

	pmc_data->npck = npck;
	pmc_data->pchws = pmc_data->ghws + ngck;

	return pmc_data;
}

#ifdef CONFIG_PM

/* Address in SECURAM that say if we suspend to backup mode. */
static void __iomem *at91_pmc_backup_suspend;

static int at91_pmc_suspend(void)
{
	unsigned int backup;

	if (!at91_pmc_backup_suspend)
		return 0;

	backup = readl_relaxed(at91_pmc_backup_suspend);
	if (!backup)
		return 0;

	return clk_save_context();
}

static void at91_pmc_resume(void)
{
	unsigned int backup;

	if (!at91_pmc_backup_suspend)
		return;

	backup = readl_relaxed(at91_pmc_backup_suspend);
	if (!backup)
		return;

	clk_restore_context();
}

static struct syscore_ops pmc_syscore_ops = {
	.suspend = at91_pmc_suspend,
	.resume = at91_pmc_resume,
};

static const struct of_device_id pmc_dt_ids[] = {
	{ .compatible = "atmel,sama5d2-pmc" },
	{ .compatible = "microchip,sama7g5-pmc", },
	{ /* sentinel */ }
};

static int __init pmc_register_ops(void)
{
	struct device_node *np;

	np = of_find_matching_node(NULL, pmc_dt_ids);
	if (!np)
		return -ENODEV;

	if (!of_device_is_available(np)) {
		of_node_put(np);
		return -ENODEV;
	}
	of_node_put(np);

	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
	if (!np)
		return -ENODEV;

	if (!of_device_is_available(np)) {
		of_node_put(np);
		return -ENODEV;
	}
	of_node_put(np);

	at91_pmc_backup_suspend = of_iomap(np, 0);
	if (!at91_pmc_backup_suspend) {
		pr_warn("%s(): unable to map securam\n", __func__);
		return -ENOMEM;
	}

	register_syscore_ops(&pmc_syscore_ops);

	return 0;
}
/* This has to happen before arch_initcall because of the tcb_clksrc driver */
postcore_initcall(pmc_register_ops);
#endif