c706c7eb0d
Pull ARM development updates from Russell King:
"Included in this update:
- moving PSCI code from ARM64/ARM to drivers/
- removal of some architecture internals from global kernel view
- addition of software based "privileged no access" support using the
old domains register to turn off the ability for kernel
loads/stores to access userspace. Only the proper accessors will
be usable.
- addition of early fixup support for early console
- re-addition (and reimplementation) of OMAP special interconnect
barrier
- removal of finish_arch_switch()
- only expose cpuX/online in sysfs if hotpluggable
- a number of code cleanups"
* 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm: (41 commits)
ARM: software-based priviledged-no-access support
ARM: entry: provide uaccess assembly macro hooks
ARM: entry: get rid of multiple macro definitions
ARM: 8421/1: smp: Collapse arch_cpu_idle_dead() into cpu_die()
ARM: uaccess: provide uaccess_save_and_enable() and uaccess_restore()
ARM: mm: improve do_ldrd_abort macro
ARM: entry: ensure that IRQs are enabled when calling syscall_trace_exit()
ARM: entry: efficiency cleanups
ARM: entry: get rid of asm_trace_hardirqs_on_cond
ARM: uaccess: simplify user access assembly
ARM: domains: remove DOMAIN_TABLE
ARM: domains: keep vectors in separate domain
ARM: domains: get rid of manager mode for user domain
ARM: domains: move initial domain setting value to asm/domains.h
ARM: domains: provide domain_mask()
ARM: domains: switch to keeping domain value in register
ARM: 8419/1: dma-mapping: harmonize definition of DMA_ERROR_CODE
ARM: 8417/1: refactor bitops functions with BIT_MASK() and BIT_WORD()
ARM: 8416/1: Feroceon: use of_iomap() to map register base
ARM: 8415/1: early fixmap support for earlycon
...
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/*
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* SMP support for R-Mobile / SH-Mobile - sh73a0 portion
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*
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* Copyright (C) 2010 Magnus Damm
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* Copyright (C) 2010 Takashi Yoshii
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <asm/smp_plat.h>
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#include <asm/smp_twd.h>
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#include "common.h"
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#include "sh73a0.h"
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#define WUPCR IOMEM(0xe6151010)
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#define SRESCR IOMEM(0xe6151018)
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#define PSTR IOMEM(0xe6151040)
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#define SBAR IOMEM(0xe6180020)
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#define APARMBAREA IOMEM(0xe6f10020)
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#define SH73A0_SCU_BASE 0xf0000000
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static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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unsigned int lcpu = cpu_logical_map(cpu);
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if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3)
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__raw_writel(1 << lcpu, WUPCR); /* wake up */
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else
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__raw_writel(1 << lcpu, SRESCR); /* reset */
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return 0;
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}
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static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
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{
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/* Map the reset vector (in headsmp.S) */
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__raw_writel(0, APARMBAREA); /* 4k */
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__raw_writel(__pa(shmobile_boot_vector), SBAR);
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/* setup sh73a0 specific SCU bits */
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shmobile_scu_base = IOMEM(SH73A0_SCU_BASE);
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shmobile_smp_scu_prepare_cpus(max_cpus);
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}
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struct smp_operations sh73a0_smp_ops __initdata = {
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.smp_prepare_cpus = sh73a0_smp_prepare_cpus,
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.smp_boot_secondary = sh73a0_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_can_disable = shmobile_smp_cpu_can_disable,
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.cpu_die = shmobile_smp_scu_cpu_die,
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.cpu_kill = shmobile_smp_scu_cpu_kill,
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#endif
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};
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