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
platform_halt(void)26 void platform_halt(void)
27 {
28 pr_info(" ** Called platform_halt() **\n");
29 simc_exit(0);
30 }
31
platform_power_off(void)32 void platform_power_off(void)
33 {
34 pr_info(" ** Called platform_power_off() **\n");
35 simc_exit(0);
36 }
37
platform_restart(void)38 void 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
46 static int
iss_panic_event(struct notifier_block * this,unsigned long event,void * ptr)47 iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
48 {
49 simc_exit(1);
50 return NOTIFY_DONE;
51 }
52
53 static struct notifier_block iss_panic_block = {
54 .notifier_call = iss_panic_event,
55 };
56
platform_setup(char ** p_cmdline)57 void __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