forked from Minki/linux
66a8950949
The MSM code has some antiquated register writes to set up the PPIs to be edge triggered. Now that we have the percpu irq interface we don't need this code so let's remove it and update the percpu irq user (msm_timer) to set the irq type. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: David Brown <davidb@codeaurora.org>
167 lines
4.0 KiB
C
167 lines
4.0 KiB
C
/*
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* Copyright (C) 2002 ARM Ltd.
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* All Rights Reserved
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* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
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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/errno.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/jiffies.h>
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#include <linux/smp.h>
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#include <linux/io.h>
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#include <asm/hardware/gic.h>
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#include <asm/cacheflush.h>
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#include <asm/cputype.h>
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#include <asm/mach-types.h>
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#include <asm/smp_plat.h>
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#include "scm-boot.h"
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#define VDD_SC1_ARRAY_CLAMP_GFS_CTL 0x15A0
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#define SCSS_CPU1CORE_RESET 0xD80
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#define SCSS_DBG_STATUS_CORE_PWRDUP 0xE64
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extern void msm_secondary_startup(void);
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/*
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* control for which core is the next to come out of the secondary
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* boot "holding pen".
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*/
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volatile int pen_release = -1;
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static DEFINE_SPINLOCK(boot_lock);
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static inline int get_core_count(void)
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{
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/* 1 + the PART[1:0] field of MIDR */
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return ((read_cpuid_id() >> 4) & 3) + 1;
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}
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void __cpuinit platform_secondary_init(unsigned int cpu)
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{
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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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* let the primary processor know we're out of the
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* pen, then head off into the C entry point
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*/
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pen_release = -1;
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smp_wmb();
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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 __cpuinit void prepare_cold_cpu(unsigned int cpu)
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{
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int ret;
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ret = scm_set_boot_addr(virt_to_phys(msm_secondary_startup),
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SCM_FLAG_COLDBOOT_CPU1);
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if (ret == 0) {
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void __iomem *sc1_base_ptr;
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sc1_base_ptr = ioremap_nocache(0x00902000, SZ_4K*2);
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if (sc1_base_ptr) {
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writel(0, sc1_base_ptr + VDD_SC1_ARRAY_CLAMP_GFS_CTL);
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writel(0, sc1_base_ptr + SCSS_CPU1CORE_RESET);
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writel(3, sc1_base_ptr + SCSS_DBG_STATUS_CORE_PWRDUP);
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iounmap(sc1_base_ptr);
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}
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} else
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printk(KERN_DEBUG "Failed to set secondary core boot "
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"address\n");
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}
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int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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unsigned long timeout;
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static int cold_boot_done;
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/* Only need to bring cpu out of reset this way once */
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if (cold_boot_done == false) {
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prepare_cold_cpu(cpu);
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cold_boot_done = true;
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}
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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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* The secondary processor is waiting to be released from
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* the holding pen - release it, then wait for it to flag
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* that it has been released by resetting pen_release.
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*
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* Note that "pen_release" is the hardware CPU ID, whereas
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* "cpu" is Linux's internal ID.
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*/
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pen_release = cpu_logical_map(cpu);
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__cpuc_flush_dcache_area((void *)&pen_release, sizeof(pen_release));
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outer_clean_range(__pa(&pen_release), __pa(&pen_release + 1));
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/*
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* Send the secondary CPU a soft interrupt, thereby causing
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* the boot monitor to read the system wide flags register,
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* and branch to the address found there.
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*/
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gic_raise_softirq(cpumask_of(cpu), 1);
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timeout = jiffies + (1 * HZ);
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while (time_before(jiffies, timeout)) {
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smp_rmb();
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if (pen_release == -1)
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break;
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udelay(10);
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}
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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 pen_release != -1 ? -ENOSYS : 0;
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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. The msm8x60
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* does not support the ARM SCU, so just set the possible cpu mask to
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* NR_CPUS.
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*/
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void __init smp_init_cpus(void)
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{
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unsigned int i, ncores = get_core_count();
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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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set_smp_cross_call(gic_raise_softirq);
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}
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void __init platform_smp_prepare_cpus(unsigned int max_cpus)
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{
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}
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