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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 | 17 | #include <linux/regulator/consumer.h> |
7fca1f20 LW |
18 | #include <linux/mfd/syscon.h> |
19 | #include <linux/regmap.h> | |
0004b017 LW |
20 | |
21 | /* Power Management Control 16bit (R/W) */ | |
22 | #define U300_SYSCON_PMCR (0x50) | |
23 | #define U300_SYSCON_PMCR_DCON_ENABLE (0x0002) | |
24 | #define U300_SYSCON_PMCR_PWR_MGNT_ENABLE (0x0001) | |
3d81277b LW |
25 | |
26 | /* | |
27 | * Regulators that power the board and chip and which are | |
28 | * not copuled to specific drivers are hogged in these | |
29 | * instances. | |
30 | */ | |
31 | static struct regulator *main_power_15; | |
32 | ||
33 | /* | |
34 | * This function is used from pm.h to shut down the system by | |
35 | * resetting all regulators in turn and then disable regulator | |
36 | * LDO D (main power). | |
37 | */ | |
38 | void u300_pm_poweroff(void) | |
39 | { | |
40 | sigset_t old, all; | |
41 | ||
42 | sigfillset(&all); | |
43 | if (!sigprocmask(SIG_BLOCK, &all, &old)) { | |
44 | /* Disable LDO D to shut down the system */ | |
45 | if (main_power_15) | |
46 | regulator_disable(main_power_15); | |
47 | else | |
48 | pr_err("regulator not available to shut down system\n"); | |
49 | (void) sigprocmask(SIG_SETMASK, &old, NULL); | |
50 | } | |
51 | return; | |
52 | } | |
53 | ||
54 | /* | |
55 | * Hog the regulators needed to power up the board. | |
56 | */ | |
4d3ab5ec | 57 | static int __init __u300_init_boardpower(struct platform_device *pdev) |
3d81277b | 58 | { |
cf0ce095 LW |
59 | struct device_node *np = pdev->dev.of_node; |
60 | struct device_node *syscon_np; | |
7fca1f20 | 61 | struct regmap *regmap; |
3d81277b | 62 | int err; |
3d81277b LW |
63 | |
64 | pr_info("U300: setting up board power\n"); | |
cf0ce095 LW |
65 | |
66 | syscon_np = of_parse_phandle(np, "syscon", 0); | |
67 | if (!syscon_np) { | |
68 | pr_crit("U300: no syscon node\n"); | |
69 | return -ENODEV; | |
70 | } | |
7fca1f20 | 71 | regmap = syscon_node_to_regmap(syscon_np); |
1e74de30 | 72 | if (IS_ERR(regmap)) { |
7fca1f20 | 73 | pr_crit("U300: could not locate syscon regmap\n"); |
1e74de30 | 74 | return PTR_ERR(regmap); |
cf0ce095 LW |
75 | } |
76 | ||
75a7f3f1 | 77 | main_power_15 = regulator_get(&pdev->dev, "vana15"); |
4d3ab5ec | 78 | |
3d81277b LW |
79 | if (IS_ERR(main_power_15)) { |
80 | pr_err("could not get vana15"); | |
81 | return PTR_ERR(main_power_15); | |
82 | } | |
83 | err = regulator_enable(main_power_15); | |
84 | if (err) { | |
85 | pr_err("could not enable vana15\n"); | |
86 | return err; | |
87 | } | |
88 | ||
89 | /* | |
90 | * On U300 a special system controller register pulls up the DC | |
91 | * until the vana15 (LDO D) regulator comes up. At this point, all | |
92 | * regulators are set and we do not need power control via | |
93 | * DC ON anymore. This function will likely be moved whenever | |
94 | * the rest of the U300 power management is implemented. | |
95 | */ | |
96 | pr_info("U300: disable system controller pull-up\n"); | |
7fca1f20 LW |
97 | regmap_update_bits(regmap, U300_SYSCON_PMCR, |
98 | U300_SYSCON_PMCR_DCON_ENABLE, 0); | |
3d81277b LW |
99 | |
100 | /* Register globally exported PM poweroff hook */ | |
101 | pm_power_off = u300_pm_poweroff; | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
4d3ab5ec LW |
106 | static int __init s365_board_probe(struct platform_device *pdev) |
107 | { | |
108 | return __u300_init_boardpower(pdev); | |
109 | } | |
110 | ||
111 | static const struct of_device_id s365_board_match[] = { | |
112 | { .compatible = "stericsson,s365" }, | |
113 | {}, | |
114 | }; | |
115 | ||
116 | static struct platform_driver s365_board_driver = { | |
117 | .driver = { | |
118 | .name = "s365-board", | |
4d3ab5ec LW |
119 | .of_match_table = s365_board_match, |
120 | }, | |
121 | }; | |
122 | ||
3d81277b LW |
123 | /* |
124 | * So at module init time we hog the regulator! | |
125 | */ | |
4d3ab5ec LW |
126 | static int __init u300_init_boardpower(void) |
127 | { | |
75a7f3f1 LW |
128 | return platform_driver_probe(&s365_board_driver, |
129 | s365_board_probe); | |
4d3ab5ec LW |
130 | } |
131 | ||
132 | device_initcall(u300_init_boardpower); | |
d697ff6d AB |
133 | MODULE_LICENSE("GPL v2"); |
134 | MODULE_AUTHOR("Linus Walleij"); |