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/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 }