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/printk.h>
18#include <linux/string.h>
19
20#include <asm/platform.h>
21#include <asm/setup.h>
22
23#include <platform/simcall.h>
24
25
26void platform_halt(void)
27{
28	pr_info(" ** Called platform_halt() **\n");
29	simc_exit(0);
30}
31
32void platform_power_off(void)
33{
34	pr_info(" ** Called platform_power_off() **\n");
35	simc_exit(0);
36}
37
38void platform_restart(void)
39{
40	/* Flush and reset the mmu, simulate a processor reset, and
41	 * jump to the reset vector. */
42	cpu_reset();
43	/* control never gets here */
44}
45
46static int
47iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
48{
49	simc_exit(1);
50	return NOTIFY_DONE;
51}
52
53static struct notifier_block iss_panic_block = {
54	.notifier_call = iss_panic_event,
55};
56
57void __init platform_setup(char **p_cmdline)
58{
59	static void *argv[COMMAND_LINE_SIZE / sizeof(void *)] __initdata;
60	static char cmdline[COMMAND_LINE_SIZE] __initdata;
61	int argc = simc_argc();
62	int argv_size = simc_argv_size();
63
64	if (argc > 1) {
65		if (argv_size > sizeof(argv)) {
66			pr_err("%s: command line too long: argv_size = %d\n",
67			       __func__, argv_size);
68		} else {
69			int i;
70
71			cmdline[0] = 0;
72			simc_argv((void *)argv);
73
74			for (i = 1; i < argc; ++i) {
75				if (i > 1)
76					strcat(cmdline, " ");
77				strcat(cmdline, argv[i]);
78			}
79			*p_cmdline = cmdline;
80		}
81	}
82
83	atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block);
84}
85