1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
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
of_at91_get_clk_range(struct device_node * np,const char * propname,struct clk_range * range)24 int 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 }
45 EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
46
of_clk_hw_pmc_get(struct of_phandle_args * clkspec,void * data)47 struct 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
pmc_data_allocate(unsigned int ncore,unsigned int nsystem,unsigned int nperiph,unsigned int ngck,unsigned int npck)83 struct 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(struct_size(pmc_data, hwtable, num_clks),
91 GFP_KERNEL);
92 if (!pmc_data)
93 return NULL;
94
95 pmc_data->ncore = ncore;
96 pmc_data->chws = pmc_data->hwtable;
97
98 pmc_data->nsystem = nsystem;
99 pmc_data->shws = pmc_data->chws + ncore;
100
101 pmc_data->nperiph = nperiph;
102 pmc_data->phws = pmc_data->shws + nsystem;
103
104 pmc_data->ngck = ngck;
105 pmc_data->ghws = pmc_data->phws + nperiph;
106
107 pmc_data->npck = npck;
108 pmc_data->pchws = pmc_data->ghws + ngck;
109
110 return pmc_data;
111 }
112
113 #ifdef CONFIG_PM
114
115 /* Address in SECURAM that say if we suspend to backup mode. */
116 static void __iomem *at91_pmc_backup_suspend;
117
at91_pmc_suspend(void)118 static int at91_pmc_suspend(void)
119 {
120 unsigned int backup;
121
122 if (!at91_pmc_backup_suspend)
123 return 0;
124
125 backup = readl_relaxed(at91_pmc_backup_suspend);
126 if (!backup)
127 return 0;
128
129 return clk_save_context();
130 }
131
at91_pmc_resume(void)132 static void at91_pmc_resume(void)
133 {
134 unsigned int backup;
135
136 if (!at91_pmc_backup_suspend)
137 return;
138
139 backup = readl_relaxed(at91_pmc_backup_suspend);
140 if (!backup)
141 return;
142
143 clk_restore_context();
144 }
145
146 static struct syscore_ops pmc_syscore_ops = {
147 .suspend = at91_pmc_suspend,
148 .resume = at91_pmc_resume,
149 };
150
151 static const struct of_device_id pmc_dt_ids[] = {
152 { .compatible = "atmel,sama5d2-pmc" },
153 { .compatible = "microchip,sama7g5-pmc", },
154 { /* sentinel */ }
155 };
156
pmc_register_ops(void)157 static int __init pmc_register_ops(void)
158 {
159 struct device_node *np;
160
161 np = of_find_matching_node(NULL, pmc_dt_ids);
162 if (!np)
163 return -ENODEV;
164
165 if (!of_device_is_available(np)) {
166 of_node_put(np);
167 return -ENODEV;
168 }
169 of_node_put(np);
170
171 np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
172 if (!np)
173 return -ENODEV;
174
175 if (!of_device_is_available(np)) {
176 of_node_put(np);
177 return -ENODEV;
178 }
179 of_node_put(np);
180
181 at91_pmc_backup_suspend = of_iomap(np, 0);
182 if (!at91_pmc_backup_suspend) {
183 pr_warn("%s(): unable to map securam\n", __func__);
184 return -ENOMEM;
185 }
186
187 register_syscore_ops(&pmc_syscore_ops);
188
189 return 0;
190 }
191 /* This has to happen before arch_initcall because of the tcb_clksrc driver */
192 postcore_initcall(pmc_register_ops);
193 #endif
194