linux-stable/arch/tile/kernel/reboot.c
Chris Metcalf bda0f5bad8 tile: various console improvements
This change improves and cleans up the tile console.

- We enable HVC_IRQ support on tilegx, with the addition of a new
  Tilera hypervisor API for tilegx to allow a console IPI.  If IPI
  support is not available we fall back to the previous polling mode.

- We simplify the earlyprintk code to use CON_BOOT and eliminate some
  of the other supporting earlyprintk code.

- A new tile_console_write() primitive is used to send output to
  the console and is factored out of the hvc_tile driver.
  This lets us support a "sim_console" boot argument to allow using
  simulator hooks to send output to the "console" as a slightly
  faster alternative to emulating the hardware more directly.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-12 14:46:18 -04:00

51 lines
1.2 KiB
C

/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
#include <linux/stddef.h>
#include <linux/reboot.h>
#include <linux/smp.h>
#include <linux/pm.h>
#include <linux/export.h>
#include <asm/page.h>
#include <asm/setup.h>
#include <hv/hypervisor.h>
#ifndef CONFIG_SMP
#define smp_send_stop()
#endif
void machine_halt(void)
{
arch_local_irq_disable_all();
smp_send_stop();
hv_halt();
}
void machine_power_off(void)
{
arch_local_irq_disable_all();
smp_send_stop();
hv_power_off();
}
void machine_restart(char *cmd)
{
arch_local_irq_disable_all();
smp_send_stop();
hv_restart((HV_VirtAddr) "vmlinux", (HV_VirtAddr) cmd);
}
/* No interesting distinction to be made here. */
void (*pm_power_off)(void) = NULL;
EXPORT_SYMBOL(pm_power_off);