xref: /openbmc/linux/arch/xtensa/platforms/iss/setup.c (revision 7561dfbf)
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 
iss_power_off(struct sys_off_data * unused)28 static 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 
iss_restart(struct notifier_block * this,unsigned long event,void * ptr)35 static 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 
45 static struct notifier_block iss_restart_block = {
46 	.notifier_call = iss_restart,
47 };
48 
49 static int
iss_panic_event(struct notifier_block * this,unsigned long event,void * ptr)50 iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
51 {
52 	simc_exit(1);
53 	return NOTIFY_DONE;
54 }
55 
56 static struct notifier_block iss_panic_block = {
57 	.notifier_call = iss_panic_event,
58 };
59 
platform_setup(char ** p_cmdline)60 void __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