kernel-ark/arch/arm/mach-shmobile/smp-sh73a0.c
Magnus Damm 8e8bffffda ARM: shmobile: sh73a0: Add Multiplatform support
Enable sh73a0 Multiplatform support for the generic sh73a0
machine vector. No board support is enabled, and the board
code for KZM9G DT Reference is left by itself.

Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
2015-02-24 08:22:45 +09:00

76 lines
2.1 KiB
C

/*
* SMP support for R-Mobile / SH-Mobile - sh73a0 portion
*
* Copyright (C) 2010 Magnus Damm
* Copyright (C) 2010 Takashi Yoshii
*
* 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 of the License.
*
* 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. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <asm/smp_plat.h>
#include <asm/smp_twd.h>
#include "common.h"
#include "sh73a0.h"
#define WUPCR IOMEM(0xe6151010)
#define SRESCR IOMEM(0xe6151018)
#define PSTR IOMEM(0xe6151040)
#define SBAR IOMEM(0xe6180020)
#define APARMBAREA IOMEM(0xe6f10020)
#define SH73A0_SCU_BASE 0xf0000000
#if defined(CONFIG_HAVE_ARM_TWD) && !defined(CONFIG_ARCH_MULTIPLATFORM)
static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, SH73A0_SCU_BASE + 0x600, 29);
void __init sh73a0_register_twd(void)
{
twd_local_timer_register(&twd_local_timer);
}
#endif
static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
unsigned int lcpu = cpu_logical_map(cpu);
if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3)
__raw_writel(1 << lcpu, WUPCR); /* wake up */
else
__raw_writel(1 << lcpu, SRESCR); /* reset */
return 0;
}
static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
{
/* Map the reset vector (in headsmp.S) */
__raw_writel(0, APARMBAREA); /* 4k */
__raw_writel(__pa(shmobile_boot_vector), SBAR);
/* setup sh73a0 specific SCU bits */
shmobile_scu_base = IOMEM(SH73A0_SCU_BASE);
shmobile_smp_scu_prepare_cpus(max_cpus);
}
struct smp_operations sh73a0_smp_ops __initdata = {
.smp_prepare_cpus = sh73a0_smp_prepare_cpus,
.smp_boot_secondary = sh73a0_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_disable = shmobile_smp_cpu_disable,
.cpu_die = shmobile_smp_scu_cpu_die,
.cpu_kill = shmobile_smp_scu_cpu_kill,
#endif
};