diff options
Diffstat (limited to 'arch/arm/mach-s5pv310/platsmp.c')
| -rw-r--r-- | arch/arm/mach-s5pv310/platsmp.c | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/arch/arm/mach-s5pv310/platsmp.c b/arch/arm/mach-s5pv310/platsmp.c deleted file mode 100644 index d357c198ede..00000000000 --- a/arch/arm/mach-s5pv310/platsmp.c +++ /dev/null @@ -1,192 +0,0 @@ -/* linux/arch/arm/mach-s5pv310/platsmp.c - * - * Copyright (c) 2010 Samsung Electronics Co., Ltd. - * http://www.samsung.com/ - * - * Cloned from linux/arch/arm/mach-vexpress/platsmp.c - * - * Copyright (C) 2002 ARM Ltd. - * All Rights Reserved - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. -*/ - -#include <linux/init.h> -#include <linux/errno.h> -#include <linux/delay.h> -#include <linux/device.h> -#include <linux/jiffies.h> -#include <linux/smp.h> -#include <linux/io.h> - -#include <asm/cacheflush.h> -#include <asm/localtimer.h> -#include <asm/smp_scu.h> -#include <asm/unified.h> - -#include <mach/hardware.h> -#include <mach/regs-clock.h> - -extern void s5pv310_secondary_startup(void); - -/* - * control for which core is the next to come out of the secondary - * boot "holding pen" - */ - -volatile int __cpuinitdata pen_release = -1; - -static void __iomem *scu_base_addr(void) -{ - return (void __iomem *)(S5P_VA_SCU); -} - -static DEFINE_SPINLOCK(boot_lock); - -void __cpuinit platform_secondary_init(unsigned int cpu) -{ - trace_hardirqs_off(); - - /* - * if any interrupts are already enabled for the primary - * core (e.g. timer irq), then they will not have been enabled - * for us: do so - */ - gic_cpu_init(0, gic_cpu_base_addr); - - /* - * let the primary processor know we're out of the - * pen, then head off into the C entry point - */ - pen_release = -1; - smp_wmb(); - - /* - * Synchronise with the boot thread. - */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); -} - -int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) -{ - unsigned long timeout; - - /* - * Set synchronisation state between this boot processor - * and the secondary one - */ - spin_lock(&boot_lock); - - /* - * The secondary processor is waiting to be released from - * the holding pen - release it, then wait for it to flag - * that it has been released by resetting pen_release. - * - * Note that "pen_release" is the hardware CPU ID, whereas - * "cpu" is Linux's internal ID. - */ - pen_release = cpu; - __cpuc_flush_dcache_area((void *)&pen_release, sizeof(pen_release)); - outer_clean_range(__pa(&pen_release), __pa(&pen_release + 1)); - - /* - * Send the secondary CPU a soft interrupt, thereby causing - * the boot monitor to read the system wide flags register, - * and branch to the address found there. - */ - smp_cross_call(cpumask_of(cpu)); - - timeout = jiffies + (1 * HZ); - while (time_before(jiffies, timeout)) { - smp_rmb(); - if (pen_release == -1) - break; - - udelay(10); - } - - /* - * now the secondary core is starting up let it run its - * calibrations, then wait for it to finish - */ - spin_unlock(&boot_lock); - - return pen_release != -1 ? -ENOSYS : 0; -} - -/* - * Initialise the CPU possible map early - this describes the CPUs - * which may be present or become present in the system. - */ - -void __init smp_init_cpus(void) -{ - void __iomem *scu_base = scu_base_addr(); - unsigned int i, ncores; - - ncores = scu_base ? scu_get_core_count(scu_base) : 1; - - /* sanity check */ - if (ncores == 0) { - printk(KERN_ERR - "S5PV310: strange CM count of 0? Default to 1\n"); - - ncores = 1; - } - - if (ncores > NR_CPUS) { - printk(KERN_WARNING - "S5PV310: no. of cores (%d) greater than configured " - "maximum of %d - clipping\n", - ncores, NR_CPUS); - ncores = NR_CPUS; - } - - for (i = 0; i < ncores; i++) - set_cpu_possible(i, true); -} - -void __init smp_prepare_cpus(unsigned int max_cpus) -{ - unsigned int ncores = num_possible_cpus(); - unsigned int cpu = smp_processor_id(); - int i; - - smp_store_cpu_info(cpu); - - /* are we trying to boot more cores than exist? */ - if (max_cpus > ncores) - max_cpus = ncores; - - /* - * Initialise the present map, which describes the set of CPUs - * actually populated at the present time. - */ - for (i = 0; i < max_cpus; i++) - set_cpu_present(i, true); - - /* - * Initialise the SCU if there are more than one CPU and let - * them know where to start. - */ - if (max_cpus > 1) { - /* - * Enable the local timer or broadcast device for the - * boot CPU, but only if we have more than one CPU. - */ - percpu_timer_setup(); - - scu_enable(scu_base_addr()); - - /* - * Write the address of secondary startup into the - * system-wide flags register. The boot monitor waits - * until it receives a soft interrupt, and then the - * secondary CPU branches to this address. - */ - __raw_writel(BSYM(virt_to_phys(s5pv310_secondary_startup)), S5P_VA_SYSRAM); - } -} |