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ee4df236 LR |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * MMP PMU power island support | |
4 | * | |
5 | * Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk> | |
6 | */ | |
7 | ||
8 | #include <linux/pm_domain.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/io.h> | |
11 | ||
12 | #include "clk.h" | |
13 | ||
14 | #define to_mmp_pm_domain(genpd) container_of(genpd, struct mmp_pm_domain, genpd) | |
15 | ||
16 | struct mmp_pm_domain { | |
17 | struct generic_pm_domain genpd; | |
18 | void __iomem *reg; | |
19 | spinlock_t *lock; | |
20 | u32 power_on; | |
21 | u32 reset; | |
22 | u32 clock_enable; | |
23 | unsigned int flags; | |
24 | }; | |
25 | ||
26 | static int mmp_pm_domain_power_on(struct generic_pm_domain *genpd) | |
27 | { | |
28 | struct mmp_pm_domain *pm_domain = to_mmp_pm_domain(genpd); | |
29 | unsigned long flags = 0; | |
30 | u32 val; | |
31 | ||
32 | if (pm_domain->lock) | |
33 | spin_lock_irqsave(pm_domain->lock, flags); | |
34 | ||
35 | val = readl(pm_domain->reg); | |
36 | ||
37 | /* Turn on the power island */ | |
38 | val |= pm_domain->power_on; | |
39 | writel(val, pm_domain->reg); | |
40 | ||
41 | /* Disable isolation */ | |
42 | val |= 0x100; | |
43 | writel(val, pm_domain->reg); | |
44 | ||
45 | /* Some blocks need to be reset after a power up */ | |
46 | if (pm_domain->reset || pm_domain->clock_enable) { | |
47 | u32 after_power_on = val; | |
48 | ||
49 | val &= ~pm_domain->reset; | |
50 | writel(val, pm_domain->reg); | |
51 | ||
52 | val |= pm_domain->clock_enable; | |
53 | writel(val, pm_domain->reg); | |
54 | ||
55 | val |= pm_domain->reset; | |
56 | writel(val, pm_domain->reg); | |
57 | ||
58 | writel(after_power_on, pm_domain->reg); | |
59 | } | |
60 | ||
61 | if (pm_domain->lock) | |
62 | spin_unlock_irqrestore(pm_domain->lock, flags); | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static int mmp_pm_domain_power_off(struct generic_pm_domain *genpd) | |
68 | { | |
69 | struct mmp_pm_domain *pm_domain = to_mmp_pm_domain(genpd); | |
70 | unsigned long flags = 0; | |
71 | u32 val; | |
72 | ||
73 | if (pm_domain->flags & MMP_PM_DOMAIN_NO_DISABLE) | |
74 | return 0; | |
75 | ||
76 | if (pm_domain->lock) | |
77 | spin_lock_irqsave(pm_domain->lock, flags); | |
78 | ||
7c55e8ef | 79 | /* Turn off and isolate the power island. */ |
ee4df236 LR |
80 | val = readl(pm_domain->reg); |
81 | val &= ~pm_domain->power_on; | |
82 | val &= ~0x100; | |
83 | writel(val, pm_domain->reg); | |
84 | ||
85 | if (pm_domain->lock) | |
86 | spin_unlock_irqrestore(pm_domain->lock, flags); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | struct generic_pm_domain *mmp_pm_domain_register(const char *name, | |
92 | void __iomem *reg, | |
93 | u32 power_on, u32 reset, u32 clock_enable, | |
94 | unsigned int flags, spinlock_t *lock) | |
95 | { | |
96 | struct mmp_pm_domain *pm_domain; | |
97 | ||
98 | pm_domain = kzalloc(sizeof(*pm_domain), GFP_KERNEL); | |
99 | if (!pm_domain) | |
100 | return ERR_PTR(-ENOMEM); | |
101 | ||
102 | pm_domain->reg = reg; | |
103 | pm_domain->power_on = power_on; | |
104 | pm_domain->reset = reset; | |
105 | pm_domain->clock_enable = clock_enable; | |
106 | pm_domain->flags = flags; | |
107 | pm_domain->lock = lock; | |
108 | ||
109 | pm_genpd_init(&pm_domain->genpd, NULL, true); | |
110 | pm_domain->genpd.name = name; | |
111 | pm_domain->genpd.power_on = mmp_pm_domain_power_on; | |
112 | pm_domain->genpd.power_off = mmp_pm_domain_power_off; | |
113 | ||
114 | return &pm_domain->genpd; | |
115 | } |