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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reset.c (1601B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *
      4 * Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com>
      5 * Copyright (C) 2012 John Crispin <john@phrozen.org>
      6 */
      7
      8#include <linux/init.h>
      9#include <linux/io.h>
     10#include <linux/pm.h>
     11#include <asm/reboot.h>
     12#include <linux/export.h>
     13
     14#include <lantiq_soc.h>
     15
     16/*
     17 * Dummy implementation.  Used to allow platform code to find out what
     18 * source was booted from
     19 */
     20unsigned char ltq_boot_select(void)
     21{
     22	return BS_SPI;
     23}
     24
     25#define BOOT_REG_BASE	(KSEG1 | 0x1F200000)
     26#define BOOT_PW1_REG	(BOOT_REG_BASE | 0x20)
     27#define BOOT_PW2_REG	(BOOT_REG_BASE | 0x24)
     28#define BOOT_PW1	0x4C545100
     29#define BOOT_PW2	0x0051544C
     30
     31#define WDT_REG_BASE	(KSEG1 | 0x1F8803F0)
     32#define WDT_PW1		0x00BE0000
     33#define WDT_PW2		0x00DC0000
     34
     35static void machine_restart(char *command)
     36{
     37	local_irq_disable();
     38
     39	/* reboot magic */
     40	ltq_w32(BOOT_PW1, (void *)BOOT_PW1_REG); /* 'LTQ\0' */
     41	ltq_w32(BOOT_PW2, (void *)BOOT_PW2_REG); /* '\0QTL' */
     42	ltq_w32(0, (void *)BOOT_REG_BASE); /* reset Bootreg RVEC */
     43
     44	/* watchdog magic */
     45	ltq_w32(WDT_PW1, (void *)WDT_REG_BASE);
     46	ltq_w32(WDT_PW2 |
     47		(0x3 << 26) | /* PWL */
     48		(0x2 << 24) | /* CLKDIV */
     49		(0x1 << 31) | /* enable */
     50		(1), /* reload */
     51		(void *)WDT_REG_BASE);
     52	unreachable();
     53}
     54
     55static void machine_halt(void)
     56{
     57	local_irq_disable();
     58	unreachable();
     59}
     60
     61static void machine_power_off(void)
     62{
     63	local_irq_disable();
     64	unreachable();
     65}
     66
     67static int __init mips_reboot_setup(void)
     68{
     69	_machine_restart = machine_restart;
     70	_machine_halt = machine_halt;
     71	pm_power_off = machine_power_off;
     72	return 0;
     73}
     74
     75arch_initcall(mips_reboot_setup);