mirror of https://gitee.com/openkylin/linux.git
257 lines
6.7 KiB
C
257 lines
6.7 KiB
C
/*
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* OMAP4 SMP source file. It contains platform specific fucntions
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* needed for the linux smp kernel.
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*
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* Copyright (C) 2009 Texas Instruments, Inc.
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*
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* Author:
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* Santosh Shilimkar <santosh.shilimkar@ti.com>
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*
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* Platform file needed for the OMAP4 SMP. This file is based on arm
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* realview smp platform.
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* * Copyright (c) 2002 ARM Limited.
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/smp.h>
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#include <linux/io.h>
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#include <asm/cacheflush.h>
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#include <asm/hardware/gic.h>
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#include <asm/smp_scu.h>
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#include "omap-secure.h"
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#include "omap-wakeupgen.h"
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#include <asm/cputype.h>
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#include "soc.h"
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#include "iomap.h"
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#include "common.h"
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#include "clockdomain.h"
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#include "pm.h"
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#define CPU_MASK 0xff0ffff0
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#define CPU_CORTEX_A9 0x410FC090
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#define CPU_CORTEX_A15 0x410FC0F0
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#define OMAP5_CORE_COUNT 0x2
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u16 pm44xx_errata;
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/* SCU base address */
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static void __iomem *scu_base;
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static DEFINE_SPINLOCK(boot_lock);
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void __iomem *omap4_get_scu_base(void)
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{
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return scu_base;
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}
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static void __cpuinit omap4_secondary_init(unsigned int cpu)
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{
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/*
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* Configure ACTRL and enable NS SMP bit access on CPU1 on HS device.
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* OMAP44XX EMU/HS devices - CPU0 SMP bit access is enabled in PPA
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* init and for CPU1, a secure PPA API provided. CPU0 must be ON
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* while executing NS_SMP API on CPU1 and PPA version must be 1.4.0+.
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* OMAP443X GP devices- SMP bit isn't accessible.
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* OMAP446X GP devices - SMP bit access is enabled on both CPUs.
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*/
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if (cpu_is_omap443x() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
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omap_secure_dispatcher(OMAP4_PPA_CPU_ACTRL_SMP_INDEX,
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4, 0, 0, 0, 0, 0);
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/*
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* If any interrupts are already enabled for the primary
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* core (e.g. timer irq), then they will not have been enabled
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* for us: do so
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*/
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gic_secondary_init(0);
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/*
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* Synchronise with the boot thread.
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*/
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spin_lock(&boot_lock);
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spin_unlock(&boot_lock);
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}
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static int __cpuinit omap4_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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static struct clockdomain *cpu1_clkdm;
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static bool booted;
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void __iomem *base = omap_get_wakeupgen_base();
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/*
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* Set synchronisation state between this boot processor
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* and the secondary one
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*/
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spin_lock(&boot_lock);
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/*
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* Update the AuxCoreBoot0 with boot state for secondary core.
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* omap_secondary_startup() routine will hold the secondary core till
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* the AuxCoreBoot1 register is updated with cpu state
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* A barrier is added to ensure that write buffer is drained
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*/
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if (omap_secure_apis_support())
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omap_modify_auxcoreboot0(0x200, 0xfffffdff);
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else
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__raw_writel(0x20, base + OMAP_AUX_CORE_BOOT_0);
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flush_cache_all();
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smp_wmb();
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if (!cpu1_clkdm)
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cpu1_clkdm = clkdm_lookup("mpu1_clkdm");
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/*
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* The SGI(Software Generated Interrupts) are not wakeup capable
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* from low power states. This is known limitation on OMAP4 and
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* needs to be worked around by using software forced clockdomain
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* wake-up. To wakeup CPU1, CPU0 forces the CPU1 clockdomain to
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* software force wakeup. The clockdomain is then put back to
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* hardware supervised mode.
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* More details can be found in OMAP4430 TRM - Version J
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* Section :
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* 4.3.4.2 Power States of CPU0 and CPU1
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*/
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if (booted) {
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/*
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* GIC distributor control register has changed between
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* CortexA9 r1pX and r2pX. The Control Register secure
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* banked version is now composed of 2 bits:
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* bit 0 == Secure Enable
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* bit 1 == Non-Secure Enable
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* The Non-Secure banked register has not changed
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* Because the ROM Code is based on the r1pX GIC, the CPU1
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* GIC restoration will cause a problem to CPU0 Non-Secure SW.
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* The workaround must be:
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* 1) Before doing the CPU1 wakeup, CPU0 must disable
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* the GIC distributor
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* 2) CPU1 must re-enable the GIC distributor on
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* it's wakeup path.
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*/
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if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) {
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local_irq_disable();
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gic_dist_disable();
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}
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clkdm_wakeup(cpu1_clkdm);
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clkdm_allow_idle(cpu1_clkdm);
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if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) {
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while (gic_dist_disabled()) {
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udelay(1);
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cpu_relax();
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}
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gic_timer_retrigger();
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local_irq_enable();
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}
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} else {
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dsb_sev();
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booted = true;
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}
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arch_send_wakeup_ipi_mask(cpumask_of(cpu));
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/*
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* Now the secondary core is starting up let it run its
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* calibrations, then wait for it to finish
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*/
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spin_unlock(&boot_lock);
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return 0;
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}
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static void __init wakeup_secondary(void)
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{
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void *startup_addr = omap_secondary_startup;
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void __iomem *base = omap_get_wakeupgen_base();
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if (cpu_is_omap446x()) {
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startup_addr = omap_secondary_startup_4460;
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pm44xx_errata |= PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD;
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}
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/*
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* Write the address of secondary startup routine into the
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* AuxCoreBoot1 where ROM code will jump and start executing
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* on secondary core once out of WFE
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* A barrier is added to ensure that write buffer is drained
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*/
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if (omap_secure_apis_support())
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omap_auxcoreboot_addr(virt_to_phys(startup_addr));
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else
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__raw_writel(virt_to_phys(omap5_secondary_startup),
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base + OMAP_AUX_CORE_BOOT_1);
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smp_wmb();
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/*
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* Send a 'sev' to wake the secondary core from WFE.
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* Drain the outstanding writes to memory
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*/
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dsb_sev();
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mb();
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}
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/*
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* Initialise the CPU possible map early - this describes the CPUs
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* which may be present or become present in the system.
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*/
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static void __init omap4_smp_init_cpus(void)
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{
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unsigned int i = 0, ncores = 1, cpu_id;
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/* Use ARM cpuid check here, as SoC detection will not work so early */
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cpu_id = read_cpuid(CPUID_ID) & CPU_MASK;
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if (cpu_id == CPU_CORTEX_A9) {
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/*
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* Currently we can't call ioremap here because
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* SoC detection won't work until after init_early.
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*/
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scu_base = OMAP2_L4_IO_ADDRESS(OMAP44XX_SCU_BASE);
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BUG_ON(!scu_base);
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ncores = scu_get_core_count(scu_base);
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} else if (cpu_id == CPU_CORTEX_A15) {
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ncores = OMAP5_CORE_COUNT;
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}
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/* sanity check */
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if (ncores > nr_cpu_ids) {
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pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
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ncores, nr_cpu_ids);
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ncores = nr_cpu_ids;
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}
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for (i = 0; i < ncores; i++)
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set_cpu_possible(i, true);
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}
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static void __init omap4_smp_prepare_cpus(unsigned int max_cpus)
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{
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/*
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* Initialise the SCU and wake up the secondary core using
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* wakeup_secondary().
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*/
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if (scu_base)
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scu_enable(scu_base);
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wakeup_secondary();
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}
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struct smp_operations omap4_smp_ops __initdata = {
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.smp_init_cpus = omap4_smp_init_cpus,
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.smp_prepare_cpus = omap4_smp_prepare_cpus,
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.smp_secondary_init = omap4_secondary_init,
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.smp_boot_secondary = omap4_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_die = omap4_cpu_die,
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#endif
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};
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