blob: 9c53f01c62ebe36151b1b114af9b31572005d468 [file] [log] [blame]
* arch/arm/mach-u300/regulator.c
* Copyright (C) 2009 ST-Ericsson AB
* License terms: GNU General Public License (GPL) version 2
* Handle board-bound regulators and board power not related
* to any devices.
* Author: Linus Walleij <>
#include <linux/device.h>
#include <linux/signal.h>
#include <linux/err.h>
#include <linux/regulator/consumer.h>
/* Those are just for writing in syscon */
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/syscon.h>
* Regulators that power the board and chip and which are
* not copuled to specific drivers are hogged in these
* instances.
static struct regulator *main_power_15;
* This function is used from pm.h to shut down the system by
* resetting all regulators in turn and then disable regulator
* LDO D (main power).
void u300_pm_poweroff(void)
sigset_t old, all;
if (!sigprocmask(SIG_BLOCK, &all, &old)) {
/* Disable LDO D to shut down the system */
if (main_power_15)
pr_err("regulator not available to shut down system\n");
(void) sigprocmask(SIG_SETMASK, &old, NULL);
* Hog the regulators needed to power up the board.
static int __init u300_init_boardpower(void)
int err;
u32 val;
pr_info("U300: setting up board power\n");
main_power_15 = regulator_get(NULL, "vana15");
if (IS_ERR(main_power_15)) {
pr_err("could not get vana15");
return PTR_ERR(main_power_15);
err = regulator_enable(main_power_15);
if (err) {
pr_err("could not enable vana15\n");
return err;
* On U300 a special system controller register pulls up the DC
* until the vana15 (LDO D) regulator comes up. At this point, all
* regulators are set and we do not need power control via
* DC ON anymore. This function will likely be moved whenever
* the rest of the U300 power management is implemented.
pr_info("U300: disable system controller pull-up\n");
val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMCR);
writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMCR);
/* Register globally exported PM poweroff hook */
pm_power_off = u300_pm_poweroff;
return 0;
* So at module init time we hog the regulator!