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 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 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 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 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