LXR linux/arch/blackfin/mach-bf561/hotplug.c

   1/*
   2 * Copyright 2007-2009 Analog Devices Inc.
   3 *               Graff Yang <graf.yang@analog.com>
   4 *
   5 * Licensed under the GPL-2 or later.
   6 */
   7
   8#include <linux/smp.h>
   9#include <asm/blackfin.h>
  10#include <asm/cacheflush.h>
  11#include <mach/pll.h>
  12
  13int hotplug_coreb;
  14
  15void platform_cpu_die(void)
  16{
  17        unsigned long iwr;
  18
  19        hotplug_coreb = 1;
  20
  21        /*
  22         * When CoreB wakes up, the code in _coreb_trampoline_start cannot
  23         * turn off the data cache. This causes the CoreB failed to boot.
  24         * As a workaround, we invalidate all the data cache before sleep.
  25         */
  26        blackfin_invalidate_entire_dcache();
  27
  28        /* disable core timer */
  29        bfin_write_TCNTL(0);
  30
  31        /* clear ipi interrupt IRQ_SUPPLE_0 of CoreB */
  32        bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (10 + 1)));
  33        SSYNC();
  34
  35        /* set CoreB wakeup by ipi0, iwr will be discarded */
  36        bfin_iwr_set_sup0(&iwr, &iwr, &iwr);
  37        SSYNC();
  38
  39        coreb_die();
  40}
  41