1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * arch/xtensa/platform-iss/setup.c
5 *
6 * Platform specific initialization.
7 *
8 * Authors: Chris Zankel <chris@zankel.net>
9 *          Joe Taylor <joe@tensilica.com>
10 *
11 * Copyright 2001 - 2005 Tensilica Inc.
12 * Copyright 2017 Cadence Design Systems Inc.
13 */
14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/notifier.h>
17#include <linux/panic_notifier.h>
18#include <linux/printk.h>
19#include <linux/reboot.h>
20#include <linux/string.h>
21
22#include <asm/platform.h>
23#include <asm/setup.h>
24
25#include <platform/simcall.h>
26
27
28static int iss_power_off(struct sys_off_data *unused)
29{
30	pr_info(" ** Called platform_power_off() **\n");
31	simc_exit(0);
32	return NOTIFY_DONE;
33}
34
35static int iss_restart(struct notifier_block *this,
36		       unsigned long event, void *ptr)
37{
38	/* Flush and reset the mmu, simulate a processor reset, and
39	 * jump to the reset vector. */
40	cpu_reset();
41
42	return NOTIFY_DONE;
43}
44
45static struct notifier_block iss_restart_block = {
46	.notifier_call = iss_restart,
47};
48
49static int
50iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
51{
52	simc_exit(1);
53	return NOTIFY_DONE;
54}
55
56static struct notifier_block iss_panic_block = {
57	.notifier_call = iss_panic_event,
58};
59
60void __init platform_setup(char **p_cmdline)
61{
62	static void *argv[COMMAND_LINE_SIZE / sizeof(void *)] __initdata;
63	static char cmdline[COMMAND_LINE_SIZE] __initdata;
64	int argc = simc_argc();
65	int argv_size = simc_argv_size();
66
67	if (argc > 1) {
68		if (argv_size > sizeof(argv)) {
69			pr_err("%s: command line too long: argv_size = %d\n",
70			       __func__, argv_size);
71		} else {
72			int i;
73
74			cmdline[0] = 0;
75			simc_argv((void *)argv);
76
77			for (i = 1; i < argc; ++i) {
78				if (i > 1)
79					strcat(cmdline, " ");
80				strcat(cmdline, argv[i]);
81			}
82			*p_cmdline = cmdline;
83		}
84	}
85
86	atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block);
87	register_restart_handler(&iss_restart_block);
88	register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
89				 SYS_OFF_PRIO_PLATFORM,
90				 iss_power_off, NULL);
91}
92