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/memblock.h> 15 #include <linux/stddef.h> 16 #include <linux/kernel.h> 17 #include <linux/init.h> 18 #include <linux/errno.h> 19 #include <linux/reboot.h> 20 #include <linux/kdev_t.h> 21 #include <linux/types.h> 22 #include <linux/major.h> 23 #include <linux/blkdev.h> 24 #include <linux/console.h> 25 #include <linux/delay.h> 26 #include <linux/stringify.h> 27 #include <linux/notifier.h> 28 29 #include <asm/platform.h> 30 #include <asm/bootparam.h> 31 #include <asm/setup.h> 32 33 #include <platform/simcall.h> 34 35 36 void __init platform_init(bp_tag_t* bootparam) 37 { 38 } 39 40 void platform_halt(void) 41 { 42 pr_info(" ** Called platform_halt() **\n"); 43 simc_exit(0); 44 } 45 46 void platform_power_off(void) 47 { 48 pr_info(" ** Called platform_power_off() **\n"); 49 simc_exit(0); 50 } 51 void platform_restart(void) 52 { 53 /* Flush and reset the mmu, simulate a processor reset, and 54 * jump to the reset vector. */ 55 cpu_reset(); 56 /* control never gets here */ 57 } 58 59 void platform_heartbeat(void) 60 { 61 } 62 63 static int 64 iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr) 65 { 66 simc_exit(1); 67 return NOTIFY_DONE; 68 } 69 70 static struct notifier_block iss_panic_block = { 71 .notifier_call = iss_panic_event, 72 }; 73 74 void __init platform_setup(char **p_cmdline) 75 { 76 static void *argv[COMMAND_LINE_SIZE / sizeof(void *)] __initdata; 77 static char cmdline[COMMAND_LINE_SIZE] __initdata; 78 int argc = simc_argc(); 79 int argv_size = simc_argv_size(); 80 81 if (argc > 1) { 82 if (argv_size > sizeof(argv)) { 83 pr_err("%s: command line too long: argv_size = %d\n", 84 __func__, argv_size); 85 } else { 86 int i; 87 88 cmdline[0] = 0; 89 simc_argv((void *)argv); 90 91 for (i = 1; i < argc; ++i) { 92 if (i > 1) 93 strcat(cmdline, " "); 94 strcat(cmdline, argv[i]); 95 } 96 *p_cmdline = cmdline; 97 } 98 } 99 100 atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block); 101 } 102