/* * 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 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_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus); } const struct smp_operations sh73a0_smp_ops __initconst = { .smp_prepare_cpus = sh73a0_smp_prepare_cpus, .smp_boot_secondary = sh73a0_boot_secondary, #ifdef [31mCONFIG_HOTPLUG_CPU[0m .cpu_can_disable = shmobile_smp_cpu_can_disable, .cpu_die = shmobile_smp_scu_cpu_die, .cpu_kill = shmobile_smp_scu_cpu_kill, #endif }; |