cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ab8500-sysctrl.c (3711B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * AB8500 system control driver
      4 *
      5 * Copyright (C) ST-Ericsson SA 2010
      6 * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
      7 */
      8
      9#include <linux/err.h>
     10#include <linux/init.h>
     11#include <linux/export.h>
     12#include <linux/platform_device.h>
     13#include <linux/pm.h>
     14#include <linux/reboot.h>
     15#include <linux/signal.h>
     16#include <linux/power_supply.h>
     17#include <linux/mfd/abx500.h>
     18#include <linux/mfd/abx500/ab8500.h>
     19#include <linux/mfd/abx500/ab8500-sysctrl.h>
     20
     21/* RtcCtrl bits */
     22#define AB8500_ALARM_MIN_LOW  0x08
     23#define AB8500_ALARM_MIN_MID 0x09
     24#define RTC_CTRL 0x0B
     25#define RTC_ALARM_ENABLE 0x4
     26
     27static struct device *sysctrl_dev;
     28
     29static void ab8500_power_off(void)
     30{
     31	sigset_t old;
     32	sigset_t all;
     33	static const char * const pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
     34	int i;
     35	bool charger_present = false;
     36	union power_supply_propval val;
     37	struct power_supply *psy;
     38	int ret;
     39
     40	if (sysctrl_dev == NULL) {
     41		pr_err("%s: sysctrl not initialized\n", __func__);
     42		return;
     43	}
     44
     45	/*
     46	 * If we have a charger connected and we're powering off,
     47	 * reboot into charge-only mode.
     48	 */
     49
     50	for (i = 0; i < ARRAY_SIZE(pss); i++) {
     51		psy = power_supply_get_by_name(pss[i]);
     52		if (!psy)
     53			continue;
     54
     55		ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
     56				&val);
     57		power_supply_put(psy);
     58
     59		if (!ret && val.intval) {
     60			charger_present = true;
     61			break;
     62		}
     63	}
     64
     65	if (!charger_present)
     66		goto shutdown;
     67
     68	/* Check if battery is known */
     69	psy = power_supply_get_by_name("ab8500_btemp");
     70	if (psy) {
     71		ret = power_supply_get_property(psy,
     72				POWER_SUPPLY_PROP_TECHNOLOGY, &val);
     73		if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
     74			pr_info("Charger '%s' is connected with known battery",
     75				pss[i]);
     76			pr_info(" - Rebooting.\n");
     77			machine_restart("charging");
     78		}
     79		power_supply_put(psy);
     80	}
     81
     82shutdown:
     83	sigfillset(&all);
     84
     85	if (!sigprocmask(SIG_BLOCK, &all, &old)) {
     86		(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
     87					 AB8500_STW4500CTRL1_SWOFF |
     88					 AB8500_STW4500CTRL1_SWRESET4500N);
     89		(void)sigprocmask(SIG_SETMASK, &old, NULL);
     90	}
     91}
     92
     93static inline bool valid_bank(u8 bank)
     94{
     95	return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
     96		(bank == AB8500_SYS_CTRL2_BLOCK));
     97}
     98
     99int ab8500_sysctrl_read(u16 reg, u8 *value)
    100{
    101	u8 bank;
    102
    103	if (sysctrl_dev == NULL)
    104		return -EPROBE_DEFER;
    105
    106	bank = (reg >> 8);
    107	if (!valid_bank(bank))
    108		return -EINVAL;
    109
    110	return abx500_get_register_interruptible(sysctrl_dev, bank,
    111		(u8)(reg & 0xFF), value);
    112}
    113EXPORT_SYMBOL(ab8500_sysctrl_read);
    114
    115int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
    116{
    117	u8 bank;
    118
    119	if (sysctrl_dev == NULL)
    120		return -EPROBE_DEFER;
    121
    122	bank = (reg >> 8);
    123	if (!valid_bank(bank)) {
    124		pr_err("invalid bank\n");
    125		return -EINVAL;
    126	}
    127
    128	return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
    129		(u8)(reg & 0xFF), mask, value);
    130}
    131EXPORT_SYMBOL(ab8500_sysctrl_write);
    132
    133static int ab8500_sysctrl_probe(struct platform_device *pdev)
    134{
    135	sysctrl_dev = &pdev->dev;
    136
    137	if (!pm_power_off)
    138		pm_power_off = ab8500_power_off;
    139
    140	return 0;
    141}
    142
    143static int ab8500_sysctrl_remove(struct platform_device *pdev)
    144{
    145	sysctrl_dev = NULL;
    146
    147	if (pm_power_off == ab8500_power_off)
    148		pm_power_off = NULL;
    149
    150	return 0;
    151}
    152
    153static const struct of_device_id ab8500_sysctrl_match[] = {
    154	{ .compatible = "stericsson,ab8500-sysctrl", },
    155	{}
    156};
    157
    158static struct platform_driver ab8500_sysctrl_driver = {
    159	.driver = {
    160		.name = "ab8500-sysctrl",
    161		.of_match_table = ab8500_sysctrl_match,
    162	},
    163	.probe = ab8500_sysctrl_probe,
    164	.remove = ab8500_sysctrl_remove,
    165};
    166
    167static int __init ab8500_sysctrl_init(void)
    168{
    169	return platform_driver_register(&ab8500_sysctrl_driver);
    170}
    171arch_initcall(ab8500_sysctrl_init);