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10#include <linux/cpu.h>
11#include <linux/device.h>
12#include <linux/errno.h>
13#include <linux/init.h>
14#include <linux/mfd/syscon.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/of_device.h>
18#include <linux/platform_device.h>
19#include <linux/pm_opp.h>
20#include <linux/regmap.h>
21#include <linux/soc/samsung/exynos-chipid.h>
22
23#include "exynos-asv.h"
24#include "exynos5422-asv.h"
25
26#define MHZ 1000000U
27
28static int exynos_asv_update_cpu_opps(struct exynos_asv *asv,
29 struct device *cpu)
30{
31 struct exynos_asv_subsys *subsys = NULL;
32 struct dev_pm_opp *opp;
33 unsigned int opp_freq;
34 int i;
35
36 for (i = 0; i < ARRAY_SIZE(asv->subsys); i++) {
37 if (of_device_is_compatible(cpu->of_node,
38 asv->subsys[i].cpu_dt_compat)) {
39 subsys = &asv->subsys[i];
40 break;
41 }
42 }
43 if (!subsys)
44 return -EINVAL;
45
46 for (i = 0; i < subsys->table.num_rows; i++) {
47 unsigned int new_volt, volt;
48 int ret;
49
50 opp_freq = exynos_asv_opp_get_frequency(subsys, i);
51
52 opp = dev_pm_opp_find_freq_exact(cpu, opp_freq * MHZ, true);
53 if (IS_ERR(opp)) {
54 dev_info(asv->dev, "cpu%d opp%d, freq: %u missing\n",
55 cpu->id, i, opp_freq);
56
57 continue;
58 }
59
60 volt = dev_pm_opp_get_voltage(opp);
61 new_volt = asv->opp_get_voltage(subsys, i, volt);
62 dev_pm_opp_put(opp);
63
64 if (new_volt == volt)
65 continue;
66
67 ret = dev_pm_opp_adjust_voltage(cpu, opp_freq * MHZ,
68 new_volt, new_volt, new_volt);
69 if (ret < 0)
70 dev_err(asv->dev,
71 "Failed to adjust OPP %u Hz/%u uV for cpu%d\n",
72 opp_freq, new_volt, cpu->id);
73 else
74 dev_dbg(asv->dev,
75 "Adjusted OPP %u Hz/%u -> %u uV, cpu%d\n",
76 opp_freq, volt, new_volt, cpu->id);
77 }
78
79 return 0;
80}
81
82static int exynos_asv_update_opps(struct exynos_asv *asv)
83{
84 struct opp_table *last_opp_table = NULL;
85 struct device *cpu;
86 int ret, cpuid;
87
88 for_each_possible_cpu(cpuid) {
89 struct opp_table *opp_table;
90
91 cpu = get_cpu_device(cpuid);
92 if (!cpu)
93 continue;
94
95 opp_table = dev_pm_opp_get_opp_table(cpu);
96 if (IS_ERR(opp_table))
97 continue;
98
99 if (!last_opp_table || opp_table != last_opp_table) {
100 last_opp_table = opp_table;
101
102 ret = exynos_asv_update_cpu_opps(asv, cpu);
103 if (ret < 0)
104 dev_err(asv->dev, "Couldn't udate OPPs for cpu%d\n",
105 cpuid);
106 }
107
108 dev_pm_opp_put_opp_table(opp_table);
109 }
110
111 return 0;
112}
113
114static int exynos_asv_probe(struct platform_device *pdev)
115{
116 int (*probe_func)(struct exynos_asv *asv);
117 struct exynos_asv *asv;
118 struct device *cpu_dev;
119 u32 product_id = 0;
120 int ret, i;
121
122 cpu_dev = get_cpu_device(0);
123 ret = dev_pm_opp_get_opp_count(cpu_dev);
124 if (ret < 0)
125 return -EPROBE_DEFER;
126
127 asv = devm_kzalloc(&pdev->dev, sizeof(*asv), GFP_KERNEL);
128 if (!asv)
129 return -ENOMEM;
130
131 asv->chipid_regmap = device_node_to_regmap(pdev->dev.of_node);
132 if (IS_ERR(asv->chipid_regmap)) {
133 dev_err(&pdev->dev, "Could not find syscon regmap\n");
134 return PTR_ERR(asv->chipid_regmap);
135 }
136
137 regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
138
139 switch (product_id & EXYNOS_MASK) {
140 case 0xE5422000:
141 probe_func = exynos5422_asv_init;
142 break;
143 default:
144 return -ENODEV;
145 }
146
147 ret = of_property_read_u32(pdev->dev.of_node, "samsung,asv-bin",
148 &asv->of_bin);
149 if (ret < 0)
150 asv->of_bin = -EINVAL;
151
152 asv->dev = &pdev->dev;
153 dev_set_drvdata(&pdev->dev, asv);
154
155 for (i = 0; i < ARRAY_SIZE(asv->subsys); i++)
156 asv->subsys[i].asv = asv;
157
158 ret = probe_func(asv);
159 if (ret < 0)
160 return ret;
161
162 return exynos_asv_update_opps(asv);
163}
164
165static const struct of_device_id exynos_asv_of_device_ids[] = {
166 { .compatible = "samsung,exynos4210-chipid" },
167 {}
168};
169
170static struct platform_driver exynos_asv_driver = {
171 .driver = {
172 .name = "exynos-asv",
173 .of_match_table = exynos_asv_of_device_ids,
174 },
175 .probe = exynos_asv_probe,
176};
177module_platform_driver(exynos_asv_driver);
178
