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 26 void platform_halt(void) 27 { 28 pr_info(" ** Called platform_halt() **\n"); 29 simc_exit(0); 30 } 31 32 void platform_power_off(void) 33 { 34 pr_info(" ** Called platform_power_off() **\n"); 35 simc_exit(0); 36 } 37 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 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 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