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4d3ab5ec20
This adds support for setting up the board power from the device tree on the U300. We use a board-specific node in the device tree for the S365 board and bind a regulator for the board power to this node. Cc: Mark Brown <broonie@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
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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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* License terms: GNU General Public License (GPL) version 2
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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 <linus.walleij@stericsson.com>
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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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/* Those are just for writing in syscon */
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#include <linux/io.h>
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#include <asm/mach-types.h>
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#include <mach/hardware.h>
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#include <mach/syscon.h>
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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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int err;
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u32 val;
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pr_info("U300: setting up board power\n");
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if (pdev)
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main_power_15 = regulator_get(&pdev->dev, "vana15");
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else
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main_power_15 = regulator_get(NULL, "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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val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMCR);
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val &= ~U300_SYSCON_PMCR_DCON_ENABLE;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMCR);
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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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.owner = THIS_MODULE,
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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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if (of_have_populated_dt())
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return platform_driver_probe(&s365_board_driver,
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s365_board_probe);
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/* Only call this on non-DT boots */
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return __u300_init_boardpower(NULL);
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}
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device_initcall(u300_init_boardpower);
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