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/string.h> 20 21 #include <asm/platform.h> 22 #include <asm/setup.h> 23 24 #include <platform/simcall.h> 25 26 27 void platform_halt(void) 28 { 29 pr_info(" ** Called platform_halt() **\n"); 30 simc_exit(0); 31 } 32 33 void platform_power_off(void) 34 { 35 pr_info(" ** Called platform_power_off() **\n"); 36 simc_exit(0); 37 } 38 39 void platform_restart(void) 40 { 41 /* Flush and reset the mmu, simulate a processor reset, and 42 * jump to the reset vector. */ 43 cpu_reset(); 44 /* control never gets here */ 45 } 46 47 static int 48 iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr) 49 { 50 simc_exit(1); 51 return NOTIFY_DONE; 52 } 53 54 static struct notifier_block iss_panic_block = { 55 .notifier_call = iss_panic_event, 56 }; 57 58 void __init platform_setup(char **p_cmdline) 59 { 60 static void *argv[COMMAND_LINE_SIZE / sizeof(void *)] __initdata; 61 static char cmdline[COMMAND_LINE_SIZE] __initdata; 62 int argc = simc_argc(); 63 int argv_size = simc_argv_size(); 64 65 if (argc > 1) { 66 if (argv_size > sizeof(argv)) { 67 pr_err("%s: command line too long: argv_size = %d\n", 68 __func__, argv_size); 69 } else { 70 int i; 71 72 cmdline[0] = 0; 73 simc_argv((void *)argv); 74 75 for (i = 1; i < argc; ++i) { 76 if (i > 1) 77 strcat(cmdline, " "); 78 strcat(cmdline, argv[i]); 79 } 80 *p_cmdline = cmdline; 81 } 82 } 83 84 atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block); 85 } 86