mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 16:54:20 +08:00
1e74de30e0
In case of error, the function syscon_node_to_regmap() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
/*
|
|
* 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 <linus.walleij@stericsson.com>
|
|
*/
|
|
#include <linux/device.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/err.h>
|
|
#include <linux/of.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regulator/machine.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/regmap.h>
|
|
|
|
/* Power Management Control 16bit (R/W) */
|
|
#define U300_SYSCON_PMCR (0x50)
|
|
#define U300_SYSCON_PMCR_DCON_ENABLE (0x0002)
|
|
#define U300_SYSCON_PMCR_PWR_MGNT_ENABLE (0x0001)
|
|
|
|
/*
|
|
* 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;
|
|
|
|
sigfillset(&all);
|
|
if (!sigprocmask(SIG_BLOCK, &all, &old)) {
|
|
/* Disable LDO D to shut down the system */
|
|
if (main_power_15)
|
|
regulator_disable(main_power_15);
|
|
else
|
|
pr_err("regulator not available to shut down system\n");
|
|
(void) sigprocmask(SIG_SETMASK, &old, NULL);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Hog the regulators needed to power up the board.
|
|
*/
|
|
static int __init __u300_init_boardpower(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct device_node *syscon_np;
|
|
struct regmap *regmap;
|
|
int err;
|
|
|
|
pr_info("U300: setting up board power\n");
|
|
|
|
syscon_np = of_parse_phandle(np, "syscon", 0);
|
|
if (!syscon_np) {
|
|
pr_crit("U300: no syscon node\n");
|
|
return -ENODEV;
|
|
}
|
|
regmap = syscon_node_to_regmap(syscon_np);
|
|
if (IS_ERR(regmap)) {
|
|
pr_crit("U300: could not locate syscon regmap\n");
|
|
return PTR_ERR(regmap);
|
|
}
|
|
|
|
main_power_15 = regulator_get(&pdev->dev, "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");
|
|
regmap_update_bits(regmap, U300_SYSCON_PMCR,
|
|
U300_SYSCON_PMCR_DCON_ENABLE, 0);
|
|
|
|
/* Register globally exported PM poweroff hook */
|
|
pm_power_off = u300_pm_poweroff;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init s365_board_probe(struct platform_device *pdev)
|
|
{
|
|
return __u300_init_boardpower(pdev);
|
|
}
|
|
|
|
static const struct of_device_id s365_board_match[] = {
|
|
{ .compatible = "stericsson,s365" },
|
|
{},
|
|
};
|
|
|
|
static struct platform_driver s365_board_driver = {
|
|
.driver = {
|
|
.name = "s365-board",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = s365_board_match,
|
|
},
|
|
};
|
|
|
|
/*
|
|
* So at module init time we hog the regulator!
|
|
*/
|
|
static int __init u300_init_boardpower(void)
|
|
{
|
|
return platform_driver_probe(&s365_board_driver,
|
|
s365_board_probe);
|
|
}
|
|
|
|
device_initcall(u300_init_boardpower);
|