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134 lines
3.3 KiB
134 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* arch/arm/mach-u300/regulator.c |
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* |
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* Copyright (C) 2009 ST-Ericsson AB |
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* Handle board-bound regulators and board power not related |
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* to any devices. |
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* Author: Linus Walleij <[email protected]> |
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*/ |
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#include <linux/device.h> |
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#include <linux/signal.h> |
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#include <linux/err.h> |
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#include <linux/of.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/regulator/machine.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/regmap.h> |
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/* Power Management Control 16bit (R/W) */ |
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#define U300_SYSCON_PMCR (0x50) |
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#define U300_SYSCON_PMCR_DCON_ENABLE (0x0002) |
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#define U300_SYSCON_PMCR_PWR_MGNT_ENABLE (0x0001) |
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/* |
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* Regulators that power the board and chip and which are |
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* not copuled to specific drivers are hogged in these |
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* instances. |
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*/ |
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static struct regulator *main_power_15; |
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/* |
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* This function is used from pm.h to shut down the system by |
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* resetting all regulators in turn and then disable regulator |
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* LDO D (main power). |
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*/ |
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void u300_pm_poweroff(void) |
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{ |
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sigset_t old, all; |
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sigfillset(&all); |
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if (!sigprocmask(SIG_BLOCK, &all, &old)) { |
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/* Disable LDO D to shut down the system */ |
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if (main_power_15) |
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regulator_disable(main_power_15); |
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else |
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pr_err("regulator not available to shut down system\n"); |
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(void) sigprocmask(SIG_SETMASK, &old, NULL); |
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} |
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return; |
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} |
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/* |
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* Hog the regulators needed to power up the board. |
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*/ |
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static int __init __u300_init_boardpower(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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struct device_node *syscon_np; |
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struct regmap *regmap; |
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int err; |
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pr_info("U300: setting up board power\n"); |
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syscon_np = of_parse_phandle(np, "syscon", 0); |
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if (!syscon_np) { |
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pr_crit("U300: no syscon node\n"); |
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return -ENODEV; |
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} |
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regmap = syscon_node_to_regmap(syscon_np); |
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if (IS_ERR(regmap)) { |
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pr_crit("U300: could not locate syscon regmap\n"); |
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return PTR_ERR(regmap); |
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} |
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main_power_15 = regulator_get(&pdev->dev, "vana15"); |
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if (IS_ERR(main_power_15)) { |
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pr_err("could not get vana15"); |
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return PTR_ERR(main_power_15); |
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} |
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err = regulator_enable(main_power_15); |
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if (err) { |
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pr_err("could not enable vana15\n"); |
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return err; |
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} |
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/* |
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* On U300 a special system controller register pulls up the DC |
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* until the vana15 (LDO D) regulator comes up. At this point, all |
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* regulators are set and we do not need power control via |
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* DC ON anymore. This function will likely be moved whenever |
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* the rest of the U300 power management is implemented. |
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*/ |
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pr_info("U300: disable system controller pull-up\n"); |
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regmap_update_bits(regmap, U300_SYSCON_PMCR, |
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U300_SYSCON_PMCR_DCON_ENABLE, 0); |
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/* Register globally exported PM poweroff hook */ |
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pm_power_off = u300_pm_poweroff; |
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return 0; |
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} |
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static int __init s365_board_probe(struct platform_device *pdev) |
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{ |
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return __u300_init_boardpower(pdev); |
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} |
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static const struct of_device_id s365_board_match[] = { |
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{ .compatible = "stericsson,s365" }, |
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{}, |
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}; |
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static struct platform_driver s365_board_driver = { |
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.driver = { |
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.name = "s365-board", |
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.of_match_table = s365_board_match, |
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}, |
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}; |
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/* |
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* So at module init time we hog the regulator! |
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*/ |
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static int __init u300_init_boardpower(void) |
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{ |
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return platform_driver_probe(&s365_board_driver, |
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s365_board_probe); |
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} |
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device_initcall(u300_init_boardpower); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Linus Walleij");
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