arch/xtensa/platforms/iss/setup.c

   1 /*
   2  *
   3  * arch/xtensa/platform-iss/setup.c
   4  *
   5  * Platform specific initialization.
   6  *
   7  * Authors: Chris Zankel <chris@zankel.net>
   8  *          Joe Taylor <joe@tensilica.com>
   9  *
  10  * Copyright 2001 - 2005 Tensilica Inc.
  11  * Copyright 2017 Cadence Design Systems Inc.
  12  *
  13  * This program is free software; you can redistribute  it and/or modify it
  14  * under  the terms of  the GNU General  Public License as published by the
  15  * Free Software Foundation;  either version 2 of the  License, or (at your
  16  * option) any later version.
  17  *
  18  */
  19 #include <linux/bootmem.h>
  20 #include <linux/stddef.h>
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23 #include <linux/errno.h>
  24 #include <linux/reboot.h>
  25 #include <linux/kdev_t.h>
  26 #include <linux/types.h>
  27 #include <linux/major.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/console.h>
  30 #include <linux/delay.h>
  31 #include <linux/stringify.h>
  32 #include <linux/notifier.h>
  33
  34 #include <asm/platform.h>
  35 #include <asm/bootparam.h>
  36 #include <asm/setup.h>
  37
  38 #include <platform/simcall.h>
  39
  40
  41 void __init platform_init(bp_tag_t* bootparam)
  42 {
  43 }
  44
  45 void platform_halt(void)
  46 {
  47         pr_info(" ** Called platform_halt() **\n");
  48         simc_exit(0);
  49 }
  50
  51 void platform_power_off(void)
  52 {
  53         pr_info(" ** Called platform_power_off() **\n");
  54         simc_exit(0);
  55 }
  56 void platform_restart(void)
  57 {
  58         /* Flush and reset the mmu, simulate a processor reset, and
  59          * jump to the reset vector. */
  60         cpu_reset();
  61         /* control never gets here */
  62 }
  63
  64 void platform_heartbeat(void)
  65 {
  66 }
  67
  68 static int
  69 iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
  70 {
  71         simc_exit(1);
  72         return NOTIFY_DONE;
  73 }
  74
  75 static struct notifier_block iss_panic_block = {
  76         .notifier_call = iss_panic_event,
  77 };
  78
  79 void __init platform_setup(char **p_cmdline)
  80 {
  81         static void *argv[COMMAND_LINE_SIZE / sizeof(void *)] __initdata;
  82         static char cmdline[COMMAND_LINE_SIZE] __initdata;
  83         int argc = simc_argc();
  84         int argv_size = simc_argv_size();
  85
  86         if (argc > 1) {
  87                 if (argv_size > sizeof(argv)) {
  88                         pr_err("%s: command line too long: argv_size = %d\n",
  89                                __func__, argv_size);
  90                 } else {
  91                         int i;
  92
  93                         cmdline[0] = 0;
  94                         simc_argv((void *)argv);
  95
  96                         for (i = 1; i < argc; ++i) {
  97                                 if (i > 1)
  98                                         strcat(cmdline, " ");
  99                                 strcat(cmdline, argv[i]);
 100                         }
 101                         *p_cmdline = cmdline;
 102                 }
 103         }
 104
 105         atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block);
 106 }