LXR linux/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
  36void __init platform_init(bp_tag_t* bootparam)
  37{
  38}
  39
  40void platform_halt(void)
  41{
  42        pr_info(" ** Called platform_halt() **\n");
  43        simc_exit(0);
  44}
  45
  46void platform_power_off(void)
  47{
  48        pr_info(" ** Called platform_power_off() **\n");
  49        simc_exit(0);
  50}
  51void 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
  59void platform_heartbeat(void)
  60{
  61}
  62
  63static int
  64iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
  65{
  66        simc_exit(1);
  67        return NOTIFY_DONE;
  68}
  69
  70static struct notifier_block iss_panic_block = {
  71        .notifier_call = iss_panic_event,
  72};
  73
  74void __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