arch/xtensa/platforms/iss/setup.c

   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 }