Commit | Line | Data |
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3d81277b LW |
1 | /* |
2 | * arch/arm/mach-u300/regulator.c | |
3 | * | |
4 | * Copyright (C) 2009 ST-Ericsson AB | |
5 | * License terms: GNU General Public License (GPL) version 2 | |
6 | * Handle board-bound regulators and board power not related | |
7 | * to any devices. | |
8 | * Author: Linus Walleij <linus.walleij@stericsson.com> | |
9 | */ | |
10 | #include <linux/device.h> | |
11 | #include <linux/signal.h> | |
12 | #include <linux/err.h> | |
4d3ab5ec LW |
13 | #include <linux/of.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/regulator/machine.h> | |
3d81277b LW |
17 | #include <linux/regulator/consumer.h> |
18 | /* Those are just for writing in syscon */ | |
19 | #include <linux/io.h> | |
b0bdd8bc | 20 | #include "u300-regs.h" |
0004b017 LW |
21 | |
22 | /* Power Management Control 16bit (R/W) */ | |
23 | #define U300_SYSCON_PMCR (0x50) | |
24 | #define U300_SYSCON_PMCR_DCON_ENABLE (0x0002) | |
25 | #define U300_SYSCON_PMCR_PWR_MGNT_ENABLE (0x0001) | |
3d81277b LW |
26 | |
27 | /* | |
28 | * Regulators that power the board and chip and which are | |
29 | * not copuled to specific drivers are hogged in these | |
30 | * instances. | |
31 | */ | |
32 | static struct regulator *main_power_15; | |
33 | ||
34 | /* | |
35 | * This function is used from pm.h to shut down the system by | |
36 | * resetting all regulators in turn and then disable regulator | |
37 | * LDO D (main power). | |
38 | */ | |
39 | void u300_pm_poweroff(void) | |
40 | { | |
41 | sigset_t old, all; | |
42 | ||
43 | sigfillset(&all); | |
44 | if (!sigprocmask(SIG_BLOCK, &all, &old)) { | |
45 | /* Disable LDO D to shut down the system */ | |
46 | if (main_power_15) | |
47 | regulator_disable(main_power_15); | |
48 | else | |
49 | pr_err("regulator not available to shut down system\n"); | |
50 | (void) sigprocmask(SIG_SETMASK, &old, NULL); | |
51 | } | |
52 | return; | |
53 | } | |
54 | ||
55 | /* | |
56 | * Hog the regulators needed to power up the board. | |
57 | */ | |
4d3ab5ec | 58 | static int __init __u300_init_boardpower(struct platform_device *pdev) |
3d81277b LW |
59 | { |
60 | int err; | |
61 | u32 val; | |
62 | ||
63 | pr_info("U300: setting up board power\n"); | |
75a7f3f1 | 64 | main_power_15 = regulator_get(&pdev->dev, "vana15"); |
4d3ab5ec | 65 | |
3d81277b LW |
66 | if (IS_ERR(main_power_15)) { |
67 | pr_err("could not get vana15"); | |
68 | return PTR_ERR(main_power_15); | |
69 | } | |
70 | err = regulator_enable(main_power_15); | |
71 | if (err) { | |
72 | pr_err("could not enable vana15\n"); | |
73 | return err; | |
74 | } | |
75 | ||
76 | /* | |
77 | * On U300 a special system controller register pulls up the DC | |
78 | * until the vana15 (LDO D) regulator comes up. At this point, all | |
79 | * regulators are set and we do not need power control via | |
80 | * DC ON anymore. This function will likely be moved whenever | |
81 | * the rest of the U300 power management is implemented. | |
82 | */ | |
83 | pr_info("U300: disable system controller pull-up\n"); | |
84 | val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMCR); | |
85 | val &= ~U300_SYSCON_PMCR_DCON_ENABLE; | |
86 | writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMCR); | |
87 | ||
88 | /* Register globally exported PM poweroff hook */ | |
89 | pm_power_off = u300_pm_poweroff; | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
4d3ab5ec LW |
94 | static int __init s365_board_probe(struct platform_device *pdev) |
95 | { | |
96 | return __u300_init_boardpower(pdev); | |
97 | } | |
98 | ||
99 | static const struct of_device_id s365_board_match[] = { | |
100 | { .compatible = "stericsson,s365" }, | |
101 | {}, | |
102 | }; | |
103 | ||
104 | static struct platform_driver s365_board_driver = { | |
105 | .driver = { | |
106 | .name = "s365-board", | |
107 | .owner = THIS_MODULE, | |
108 | .of_match_table = s365_board_match, | |
109 | }, | |
110 | }; | |
111 | ||
3d81277b LW |
112 | /* |
113 | * So at module init time we hog the regulator! | |
114 | */ | |
4d3ab5ec LW |
115 | static int __init u300_init_boardpower(void) |
116 | { | |
75a7f3f1 LW |
117 | return platform_driver_probe(&s365_board_driver, |
118 | s365_board_probe); | |
4d3ab5ec LW |
119 | } |
120 | ||
121 | device_initcall(u300_init_boardpower); |