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  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  *
  17  */
  18 #include <linux/stddef.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/errno.h>
  22 #include <linux/reboot.h>
  23 #include <linux/kdev_t.h>
  24 #include <linux/types.h>
  25 #include <linux/major.h>
  26 #include <linux/blkdev.h>
  27 #include <linux/console.h>
  28 #include <linux/delay.h>
  29 #include <linux/stringify.h>
  30 #include <linux/notifier.h>
  31
  32 #include <asm/platform.h>
  33 #include <asm/bootparam.h>
  34
  35
  36 void __init platform_init(bp_tag_t* bootparam)
  37 {
  38
  39 }
  40
  41 void platform_halt(void)
  42 {
  43         pr_info(" ** Called platform_halt() **\n");
  44         __asm__ __volatile__("movi a2, 1\nsimcall\n");
  45 }
  46
  47 void platform_power_off(void)
  48 {
  49         pr_info(" ** Called platform_power_off() **\n");
  50         __asm__ __volatile__("movi a2, 1\nsimcall\n");
  51 }
  52 void platform_restart(void)
  53 {
  54         /* Flush and reset the mmu, simulate a processor reset, and
  55          * jump to the reset vector. */
  56
  57         __asm__ __volatile__("movi      a2, 15\n\t"
  58                              "wsr       a2, icountlevel\n\t"
  59                              "movi      a2, 0\n\t"
  60                              "wsr       a2, icount\n\t"
  61 #if XCHAL_NUM_IBREAK > 0
  62                              "wsr       a2, ibreakenable\n\t"
  63 #endif
  64 #if XCHAL_HAVE_LOOPS
  65                              "wsr       a2, lcount\n\t"
  66 #endif
  67                              "movi      a2, 0x1f\n\t"
  68                              "wsr       a2, ps\n\t"
  69                              "isync\n\t"
  70                              "jx        %0\n\t"
  71                              :
  72                              : "a" (XCHAL_RESET_VECTOR_VADDR)
  73                              : "a2");
  74
  75         /* control never gets here */
  76 }
  77
  78 extern void iss_net_poll(void);
  79
  80 const char twirl[]="|/-\\|/-\\";
  81
  82 void platform_heartbeat(void)
  83 {
  84 #if 0
  85         static int i = 0, j = 0;
  86
  87         if (--i < 0) {
  88                 i = 99;
  89                 printk("\r%c\r", twirl[j++]);
  90                 if (j == 8)
  91                         j = 0;
  92         }
  93 #endif
  94 }
  95
  96
  97
  98 static int
  99 iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
 100 {
 101         __asm__ __volatile__("movi a2, -1; simcall\n");
 102         return NOTIFY_DONE;
 103 }
 104
 105 static struct notifier_block iss_panic_block = {
 106         iss_panic_event,
 107         NULL,
 108         0
 109 };
 110
 111 void __init platform_setup(char **p_cmdline)
 112 {
 113         atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block);
 114 }