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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2013 Boris BREZILLON <[email protected]>
4 */
5
6#include <linux/clk.h>
7#include <linux/clk-provider.h>
8#include <linux/clkdev.h>
9#include <linux/clk/at91_pmc.h>
10#include <linux/of.h>
11#include <linux/of_address.h>
12#include <linux/mfd/syscon.h>
13#include <linux/platform_device.h>
14#include <linux/regmap.h>
15#include <linux/syscore_ops.h>
16
17#include <asm/proc-fns.h>
18
19#include "pmc.h"
20
21#define PMC_MAX_IDS 128
22#define PMC_MAX_PCKS 8
23
24int of_at91_get_clk_range(struct device_node *np, const char *propname,
25 struct clk_range *range)
26{
27 u32 min, max;
28 int ret;
29
30 ret = of_property_read_u32_index(np, propname, 0, &min);
31 if (ret)
32 return ret;
33
34 ret = of_property_read_u32_index(np, propname, 1, &max);
35 if (ret)
36 return ret;
37
38 if (range) {
39 range->min = min;
40 range->max = max;
41 }
42
43 return 0;
44}
45EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
46
47struct clk_hw *of_clk_hw_pmc_get(struct of_phandle_args *clkspec, void *data)
48{
49 unsigned int type = clkspec->args[0];
50 unsigned int idx = clkspec->args[1];
51 struct pmc_data *pmc_data = data;
52
53 switch (type) {
54 case PMC_TYPE_CORE:
55 if (idx < pmc_data->ncore)
56 return pmc_data->chws[idx];
57 break;
58 case PMC_TYPE_SYSTEM:
59 if (idx < pmc_data->nsystem)
60 return pmc_data->shws[idx];
61 break;
62 case PMC_TYPE_PERIPHERAL:
63 if (idx < pmc_data->nperiph)
64 return pmc_data->phws[idx];
65 break;
66 case PMC_TYPE_GCK:
67 if (idx < pmc_data->ngck)
68 return pmc_data->ghws[idx];
69 break;
70 case PMC_TYPE_PROGRAMMABLE:
71 if (idx < pmc_data->npck)
72 return pmc_data->pchws[idx];
73 break;
74 default:
75 break;
76 }
77
78 pr_err("%s: invalid type (%u) or index (%u)\n", __func__, type, idx);
79
80 return ERR_PTR(-EINVAL);
81}
82
83struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
84 unsigned int nperiph, unsigned int ngck,
85 unsigned int npck)
86{
87 unsigned int num_clks = ncore + nsystem + nperiph + ngck + npck;
88 struct pmc_data *pmc_data;
89
90 pmc_data = kzalloc_flex(*pmc_data, hwtable, num_clks);
91 if (!pmc_data)
92 return NULL;
93
94 pmc_data->ncore = ncore;
95 pmc_data->chws = pmc_data->hwtable;
96
97 pmc_data->nsystem = nsystem;
98 pmc_data->shws = pmc_data->chws + ncore;
99
100 pmc_data->nperiph = nperiph;
101 pmc_data->phws = pmc_data->shws + nsystem;
102
103 pmc_data->ngck = ngck;
104 pmc_data->ghws = pmc_data->phws + nperiph;
105
106 pmc_data->npck = npck;
107 pmc_data->pchws = pmc_data->ghws + ngck;
108
109 return pmc_data;
110}
111
112#ifdef CONFIG_PM
113
114/* Address in SECURAM that say if we suspend to backup mode. */
115static void __iomem *at91_pmc_backup_suspend;
116
117static int at91_pmc_suspend(void *data)
118{
119 unsigned int backup;
120
121 if (!at91_pmc_backup_suspend)
122 return 0;
123
124 backup = readl_relaxed(at91_pmc_backup_suspend);
125 if (!backup)
126 return 0;
127
128 return clk_save_context();
129}
130
131static void at91_pmc_resume(void *data)
132{
133 unsigned int backup;
134
135 if (!at91_pmc_backup_suspend)
136 return;
137
138 backup = readl_relaxed(at91_pmc_backup_suspend);
139 if (!backup)
140 return;
141
142 clk_restore_context();
143}
144
145static const struct syscore_ops pmc_syscore_ops = {
146 .suspend = at91_pmc_suspend,
147 .resume = at91_pmc_resume,
148};
149
150static struct syscore pmc_syscore = {
151 .ops = &pmc_syscore_ops,
152};
153
154static const struct of_device_id pmc_dt_ids[] = {
155 { .compatible = "atmel,sama5d2-pmc" },
156 { .compatible = "microchip,sama7g5-pmc", },
157 { .compatible = "microchip,sama7d65-pmc", },
158 { /* sentinel */ }
159};
160
161static int __init pmc_register_ops(void)
162{
163 struct device_node *np;
164
165 np = of_find_matching_node(NULL, pmc_dt_ids);
166 if (!np)
167 return -ENODEV;
168
169 if (!of_device_is_available(np)) {
170 of_node_put(np);
171 return -ENODEV;
172 }
173 of_node_put(np);
174
175 np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
176 if (!np)
177 return -ENODEV;
178
179 if (!of_device_is_available(np)) {
180 of_node_put(np);
181 return -ENODEV;
182 }
183
184 at91_pmc_backup_suspend = of_iomap(np, 0);
185 of_node_put(np);
186 if (!at91_pmc_backup_suspend) {
187 pr_warn("%s(): unable to map securam\n", __func__);
188 return -ENOMEM;
189 }
190
191 register_syscore(&pmc_syscore);
192
193 return 0;
194}
195/* This has to happen before arch_initcall because of the tcb_clksrc driver */
196postcore_initcall(pmc_register_ops);
197#endif