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 <[email protected]>
   9  *          Joe Taylor <[email protected]>
  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 }