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f15107f4 JN |
1 | /* |
2 | * Copyright (C) 2015 Linaro Ltd. | |
3 | * | |
4 | * Author: Jun Nie <jun.nie@linaro.org> | |
5 | * License terms: GNU General Public License (GPL) version 2 | |
6 | */ | |
7 | #include <linux/delay.h> | |
8 | #include <linux/err.h> | |
9 | #include <linux/io.h> | |
10 | #include <linux/of.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/pm_domain.h> | |
13 | #include <linux/slab.h> | |
14 | ||
15 | #define PCU_DM_CLKEN 0x18 | |
16 | #define PCU_DM_RSTEN 0x1C | |
17 | #define PCU_DM_ISOEN 0x20 | |
18 | #define PCU_DM_PWRDN 0x24 | |
19 | #define PCU_DM_ACK_SYNC 0x28 | |
20 | ||
21 | enum { | |
22 | PCU_DM_NEON0 = 0, | |
23 | PCU_DM_NEON1, | |
24 | PCU_DM_GPU, | |
25 | PCU_DM_DECPPU, | |
26 | PCU_DM_VOU, | |
27 | PCU_DM_R2D, | |
28 | PCU_DM_TOP, | |
29 | }; | |
30 | ||
31 | static void __iomem *pcubase; | |
32 | ||
33 | struct zx_pm_domain { | |
34 | struct generic_pm_domain dm; | |
35 | unsigned int bit; | |
36 | }; | |
37 | ||
38 | static int normal_power_off(struct generic_pm_domain *domain) | |
39 | { | |
40 | struct zx_pm_domain *zpd = (struct zx_pm_domain *)domain; | |
41 | unsigned long loop = 1000; | |
42 | u32 tmp; | |
43 | ||
44 | tmp = readl_relaxed(pcubase + PCU_DM_CLKEN); | |
45 | tmp &= ~BIT(zpd->bit); | |
46 | writel_relaxed(tmp, pcubase + PCU_DM_CLKEN); | |
47 | udelay(5); | |
48 | ||
49 | tmp = readl_relaxed(pcubase + PCU_DM_ISOEN); | |
50 | tmp &= ~BIT(zpd->bit); | |
51 | writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_ISOEN); | |
52 | udelay(5); | |
53 | ||
54 | tmp = readl_relaxed(pcubase + PCU_DM_RSTEN); | |
55 | tmp &= ~BIT(zpd->bit); | |
56 | writel_relaxed(tmp, pcubase + PCU_DM_RSTEN); | |
57 | udelay(5); | |
58 | ||
59 | tmp = readl_relaxed(pcubase + PCU_DM_PWRDN); | |
60 | tmp &= ~BIT(zpd->bit); | |
61 | writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_PWRDN); | |
62 | do { | |
63 | tmp = readl_relaxed(pcubase + PCU_DM_ACK_SYNC) & BIT(zpd->bit); | |
64 | } while (--loop && !tmp); | |
65 | ||
66 | if (!loop) { | |
67 | pr_err("Error: %s %s fail\n", __func__, domain->name); | |
68 | return -EIO; | |
69 | } | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | static int normal_power_on(struct generic_pm_domain *domain) | |
75 | { | |
76 | struct zx_pm_domain *zpd = (struct zx_pm_domain *)domain; | |
77 | unsigned long loop = 10000; | |
78 | u32 tmp; | |
79 | ||
80 | tmp = readl_relaxed(pcubase + PCU_DM_PWRDN); | |
81 | tmp &= ~BIT(zpd->bit); | |
82 | writel_relaxed(tmp, pcubase + PCU_DM_PWRDN); | |
83 | do { | |
84 | tmp = readl_relaxed(pcubase + PCU_DM_ACK_SYNC) & BIT(zpd->bit); | |
85 | } while (--loop && tmp); | |
86 | ||
87 | if (!loop) { | |
88 | pr_err("Error: %s %s fail\n", __func__, domain->name); | |
89 | return -EIO; | |
90 | } | |
91 | ||
92 | tmp = readl_relaxed(pcubase + PCU_DM_RSTEN); | |
93 | tmp &= ~BIT(zpd->bit); | |
94 | writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_RSTEN); | |
95 | udelay(5); | |
96 | ||
97 | tmp = readl_relaxed(pcubase + PCU_DM_ISOEN); | |
98 | tmp &= ~BIT(zpd->bit); | |
99 | writel_relaxed(tmp, pcubase + PCU_DM_ISOEN); | |
100 | udelay(5); | |
101 | ||
102 | tmp = readl_relaxed(pcubase + PCU_DM_CLKEN); | |
103 | tmp &= ~BIT(zpd->bit); | |
104 | writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_CLKEN); | |
105 | udelay(5); | |
106 | return 0; | |
107 | } | |
108 | ||
109 | static struct zx_pm_domain gpu_domain = { | |
110 | .dm = { | |
111 | .name = "gpu_domain", | |
112 | .power_off = normal_power_off, | |
113 | .power_on = normal_power_on, | |
114 | }, | |
115 | .bit = PCU_DM_GPU, | |
116 | }; | |
117 | ||
118 | static struct zx_pm_domain decppu_domain = { | |
119 | .dm = { | |
120 | .name = "decppu_domain", | |
121 | .power_off = normal_power_off, | |
122 | .power_on = normal_power_on, | |
123 | }, | |
124 | .bit = PCU_DM_DECPPU, | |
125 | }; | |
126 | ||
127 | static struct zx_pm_domain vou_domain = { | |
128 | .dm = { | |
129 | .name = "vou_domain", | |
130 | .power_off = normal_power_off, | |
131 | .power_on = normal_power_on, | |
132 | }, | |
133 | .bit = PCU_DM_VOU, | |
134 | }; | |
135 | ||
136 | static struct zx_pm_domain r2d_domain = { | |
137 | .dm = { | |
138 | .name = "r2d_domain", | |
139 | .power_off = normal_power_off, | |
140 | .power_on = normal_power_on, | |
141 | }, | |
142 | .bit = PCU_DM_R2D, | |
143 | }; | |
144 | ||
145 | static struct generic_pm_domain *zx296702_pm_domains[] = { | |
146 | &vou_domain.dm, | |
147 | &gpu_domain.dm, | |
148 | &decppu_domain.dm, | |
149 | &r2d_domain.dm, | |
150 | }; | |
151 | ||
152 | static int zx296702_pd_probe(struct platform_device *pdev) | |
153 | { | |
154 | struct genpd_onecell_data *genpd_data; | |
155 | struct resource *res; | |
156 | int i; | |
157 | ||
158 | genpd_data = devm_kzalloc(&pdev->dev, sizeof(*genpd_data), GFP_KERNEL); | |
159 | if (!genpd_data) | |
160 | return -ENOMEM; | |
161 | ||
162 | genpd_data->domains = zx296702_pm_domains; | |
163 | genpd_data->num_domains = ARRAY_SIZE(zx296702_pm_domains); | |
164 | ||
165 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
166 | if (!res) { | |
167 | dev_err(&pdev->dev, "no memory resource defined\n"); | |
168 | return -ENODEV; | |
169 | } | |
170 | ||
171 | pcubase = devm_ioremap_resource(&pdev->dev, res); | |
172 | if (!pcubase) { | |
173 | dev_err(&pdev->dev, "ioremap fail.\n"); | |
174 | return -EIO; | |
175 | } | |
176 | ||
177 | for (i = 0; i < ARRAY_SIZE(zx296702_pm_domains); ++i) | |
178 | pm_genpd_init(zx296702_pm_domains[i], NULL, false); | |
179 | ||
180 | of_genpd_add_provider_onecell(pdev->dev.of_node, genpd_data); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static const struct of_device_id zx296702_pm_domain_matches[] __initconst = { | |
185 | { .compatible = "zte,zx296702-pcu", }, | |
186 | { }, | |
187 | }; | |
188 | ||
189 | static struct platform_driver zx296702_pd_driver __initdata = { | |
190 | .driver = { | |
191 | .name = "zx-powerdomain", | |
192 | .owner = THIS_MODULE, | |
193 | .of_match_table = zx296702_pm_domain_matches, | |
194 | }, | |
195 | .probe = zx296702_pd_probe, | |
196 | }; | |
197 | ||
198 | static int __init zx296702_pd_init(void) | |
199 | { | |
200 | return platform_driver_register(&zx296702_pd_driver); | |
201 | } | |
202 | subsys_initcall(zx296702_pd_init); |