summaryrefslogtreecommitdiffstats
path: root/arch/blackfin/mach-common/smp.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/blackfin/mach-common/smp.c')
-rw-r--r--arch/blackfin/mach-common/smp.c432
1 files changed, 0 insertions, 432 deletions
diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c
deleted file mode 100644
index b32ddab7966c..000000000000
--- a/arch/blackfin/mach-common/smp.c
+++ /dev/null
@@ -1,432 +0,0 @@
-/*
- * IPI management based on arch/arm/kernel/smp.c (Copyright 2002 ARM Limited)
- *
- * Copyright 2007-2009 Analog Devices Inc.
- * Philippe Gerum <rpm@xenomai.org>
- *
- * Licensed under the GPL-2.
- */
-
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-#include <linux/sched/mm.h>
-#include <linux/sched/task_stack.h>
-#include <linux/interrupt.h>
-#include <linux/cache.h>
-#include <linux/clockchips.h>
-#include <linux/profile.h>
-#include <linux/errno.h>
-#include <linux/mm.h>
-#include <linux/cpu.h>
-#include <linux/smp.h>
-#include <linux/cpumask.h>
-#include <linux/seq_file.h>
-#include <linux/irq.h>
-#include <linux/slab.h>
-#include <linux/atomic.h>
-#include <asm/cacheflush.h>
-#include <asm/irq_handler.h>
-#include <asm/mmu_context.h>
-#include <asm/pgtable.h>
-#include <asm/pgalloc.h>
-#include <asm/processor.h>
-#include <asm/ptrace.h>
-#include <asm/cpu.h>
-#include <asm/time.h>
-#include <linux/err.h>
-
-/*
- * Anomaly notes:
- * 05000120 - we always define corelock as 32-bit integer in L2
- */
-struct corelock_slot corelock __attribute__ ((__section__(".l2.bss")));
-
-#ifdef CONFIG_ICACHE_FLUSH_L1
-unsigned long blackfin_iflush_l1_entry[NR_CPUS];
-#endif
-
-struct blackfin_initial_pda initial_pda_coreb;
-
-enum ipi_message_type {
- BFIN_IPI_NONE,
- BFIN_IPI_TIMER,
- BFIN_IPI_RESCHEDULE,
- BFIN_IPI_CALL_FUNC,
- BFIN_IPI_CPU_STOP,
-};
-
-struct blackfin_flush_data {
- unsigned long start;
- unsigned long end;
-};
-
-void *secondary_stack;
-
-static struct blackfin_flush_data smp_flush_data;
-
-static DEFINE_SPINLOCK(stop_lock);
-
-/* A magic number - stress test shows this is safe for common cases */
-#define BFIN_IPI_MSGQ_LEN 5
-
-/* Simple FIFO buffer, overflow leads to panic */
-struct ipi_data {
- atomic_t count;
- atomic_t bits;
-};
-
-static DEFINE_PER_CPU(struct ipi_data, bfin_ipi);
-
-static void ipi_cpu_stop(unsigned int cpu)
-{
- spin_lock(&stop_lock);
- printk(KERN_CRIT "CPU%u: stopping\n", cpu);
- dump_stack();
- spin_unlock(&stop_lock);
-
- set_cpu_online(cpu, false);
-
- local_irq_disable();
-
- while (1)
- SSYNC();
-}
-
-static void ipi_flush_icache(void *info)
-{
- struct blackfin_flush_data *fdata = info;
-
- /* Invalidate the memory holding the bounds of the flushed region. */
- blackfin_dcache_invalidate_range((unsigned long)fdata,
- (unsigned long)fdata + sizeof(*fdata));
-
- /* Make sure all write buffers in the data side of the core
- * are flushed before trying to invalidate the icache. This
- * needs to be after the data flush and before the icache
- * flush so that the SSYNC does the right thing in preventing
- * the instruction prefetcher from hitting things in cached
- * memory at the wrong time -- it runs much further ahead than
- * the pipeline.
- */
- SSYNC();
-
- /* ipi_flaush_icache is invoked by generic flush_icache_range,
- * so call blackfin arch icache flush directly here.
- */
- blackfin_icache_flush_range(fdata->start, fdata->end);
-}
-
-/* Use IRQ_SUPPLE_0 to request reschedule.
- * When returning from interrupt to user space,
- * there is chance to reschedule */
-static irqreturn_t ipi_handler_int0(int irq, void *dev_instance)
-{
- unsigned int cpu = smp_processor_id();
-
- platform_clear_ipi(cpu, IRQ_SUPPLE_0);
- return IRQ_HANDLED;
-}
-
-DECLARE_PER_CPU(struct clock_event_device, coretmr_events);
-void ipi_timer(void)
-{
- int cpu = smp_processor_id();
- struct clock_event_device *evt = &per_cpu(coretmr_events, cpu);
- evt->event_handler(evt);
-}
-
-static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
-{
- struct ipi_data *bfin_ipi_data;
- unsigned int cpu = smp_processor_id();
- unsigned long pending;
- unsigned long msg;
-
- platform_clear_ipi(cpu, IRQ_SUPPLE_1);
-
- smp_rmb();
- bfin_ipi_data = this_cpu_ptr(&bfin_ipi);
- while ((pending = atomic_xchg(&bfin_ipi_data->bits, 0)) != 0) {
- msg = 0;
- do {
- msg = find_next_bit(&pending, BITS_PER_LONG, msg + 1);
- switch (msg) {
- case BFIN_IPI_TIMER:
- ipi_timer();
- break;
- case BFIN_IPI_RESCHEDULE:
- scheduler_ipi();
- break;
- case BFIN_IPI_CALL_FUNC:
- generic_smp_call_function_interrupt();
- break;
- case BFIN_IPI_CPU_STOP:
- ipi_cpu_stop(cpu);
- break;
- default:
- goto out;
- }
- atomic_dec(&bfin_ipi_data->count);
- } while (msg < BITS_PER_LONG);
-
- }
-out:
- return IRQ_HANDLED;
-}
-
-static void bfin_ipi_init(void)
-{
- unsigned int cpu;
- struct ipi_data *bfin_ipi_data;
- for_each_possible_cpu(cpu) {
- bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
- atomic_set(&bfin_ipi_data->bits, 0);
- atomic_set(&bfin_ipi_data->count, 0);
- }
-}
-
-void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
-{
- unsigned int cpu;
- struct ipi_data *bfin_ipi_data;
- unsigned long flags;
-
- local_irq_save(flags);
- for_each_cpu(cpu, cpumask) {
- bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
- atomic_or((1 << msg), &bfin_ipi_data->bits);
- atomic_inc(&bfin_ipi_data->count);
- }
- local_irq_restore(flags);
- smp_wmb();
- for_each_cpu(cpu, cpumask)
- platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1);
-}
-
-void arch_send_call_function_single_ipi(int cpu)
-{
- send_ipi(cpumask_of(cpu), BFIN_IPI_CALL_FUNC);
-}
-
-void arch_send_call_function_ipi_mask(const struct cpumask *mask)
-{
- send_ipi(mask, BFIN_IPI_CALL_FUNC);
-}
-
-void smp_send_reschedule(int cpu)
-{
- send_ipi(cpumask_of(cpu), BFIN_IPI_RESCHEDULE);
-
- return;
-}
-
-void smp_send_msg(const struct cpumask *mask, unsigned long type)
-{
- send_ipi(mask, type);
-}
-
-void smp_timer_broadcast(const struct cpumask *mask)
-{
- smp_send_msg(mask, BFIN_IPI_TIMER);
-}
-
-void smp_send_stop(void)
-{
- cpumask_t callmap;
-
- preempt_disable();
- cpumask_copy(&callmap, cpu_online_mask);
- cpumask_clear_cpu(smp_processor_id(), &callmap);
- if (!cpumask_empty(&callmap))
- send_ipi(&callmap, BFIN_IPI_CPU_STOP);
-
- preempt_enable();
-
- return;
-}
-
-int __cpu_up(unsigned int cpu, struct task_struct *idle)
-{
- int ret;
-
- secondary_stack = task_stack_page(idle) + THREAD_SIZE;
-
- ret = platform_boot_secondary(cpu, idle);
-
- secondary_stack = NULL;
-
- return ret;
-}
-
-static void setup_secondary(unsigned int cpu)
-{
- unsigned long ilat;
-
- bfin_write_IMASK(0);
- CSYNC();
- ilat = bfin_read_ILAT();
- CSYNC();
- bfin_write_ILAT(ilat);
- CSYNC();
-
- /* Enable interrupt levels IVG7-15. IARs have been already
- * programmed by the boot CPU. */
- bfin_irq_flags |= IMASK_IVG15 |
- IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
- IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;
-}
-
-void secondary_start_kernel(void)
-{
- unsigned int cpu = smp_processor_id();
- struct mm_struct *mm = &init_mm;
-
- if (_bfin_swrst & SWRST_DBL_FAULT_B) {
- printk(KERN_EMERG "CoreB Recovering from DOUBLE FAULT event\n");
-#ifdef CONFIG_DEBUG_DOUBLEFAULT
- printk(KERN_EMERG " While handling exception (EXCAUSE = %#x) at %pF\n",
- initial_pda_coreb.seqstat_doublefault & SEQSTAT_EXCAUSE,
- initial_pda_coreb.retx_doublefault);
- printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %pF\n",
- initial_pda_coreb.dcplb_doublefault_addr);
- printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %pF\n",
- initial_pda_coreb.icplb_doublefault_addr);
-#endif
- printk(KERN_NOTICE " The instruction at %pF caused a double exception\n",
- initial_pda_coreb.retx);
- }
-
- /*
- * We want the D-cache to be enabled early, in case the atomic
- * support code emulates cache coherence (see
- * __ARCH_SYNC_CORE_DCACHE).
- */
- init_exception_vectors();
-
- local_irq_disable();
-
- /* Attach the new idle task to the global mm. */
- mmget(mm);
- mmgrab(mm);
- current->active_mm = mm;
-
- preempt_disable();
-
- setup_secondary(cpu);
-
- platform_secondary_init(cpu);
- /* setup local core timer */
- bfin_local_timer_setup();
-
- local_irq_enable();
-
- bfin_setup_caches(cpu);
-
- notify_cpu_starting(cpu);
- /*
- * Calibrate loops per jiffy value.
- * IRQs need to be enabled here - D-cache can be invalidated
- * in timer irq handler, so core B can read correct jiffies.
- */
- calibrate_delay();
-
- /* We are done with local CPU inits, unblock the boot CPU. */
- set_cpu_online(cpu, true);
- cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
-}
-
-void __init smp_prepare_boot_cpu(void)
-{
-}
-
-void __init smp_prepare_cpus(unsigned int max_cpus)
-{
- platform_prepare_cpus(max_cpus);
- bfin_ipi_init();
- platform_request_ipi(IRQ_SUPPLE_0, ipi_handler_int0);
- platform_request_ipi(IRQ_SUPPLE_1, ipi_handler_int1);
-}
-
-void __init smp_cpus_done(unsigned int max_cpus)
-{
- unsigned long bogosum = 0;
- unsigned int cpu;
-
- for_each_online_cpu(cpu)
- bogosum += loops_per_jiffy;
-
- printk(KERN_INFO "SMP: Total of %d processors activated "
- "(%lu.%02lu BogoMIPS).\n",
- num_online_cpus(),
- bogosum / (500000/HZ),
- (bogosum / (5000/HZ)) % 100);
-}
-
-void smp_icache_flush_range_others(unsigned long start, unsigned long end)
-{
- smp_flush_data.start = start;
- smp_flush_data.end = end;
-
- preempt_disable();
- if (smp_call_function(&ipi_flush_icache, &smp_flush_data, 1))
- printk(KERN_WARNING "SMP: failed to run I-cache flush request on other CPUs\n");
- preempt_enable();
-}
-EXPORT_SYMBOL_GPL(smp_icache_flush_range_others);
-
-#ifdef __ARCH_SYNC_CORE_ICACHE
-unsigned long icache_invld_count[NR_CPUS];
-void resync_core_icache(void)
-{
- unsigned int cpu = get_cpu();
- blackfin_invalidate_entire_icache();
- icache_invld_count[cpu]++;
- put_cpu();
-}
-EXPORT_SYMBOL(resync_core_icache);
-#endif
-
-#ifdef __ARCH_SYNC_CORE_DCACHE
-unsigned long dcache_invld_count[NR_CPUS];
-unsigned long barrier_mask __attribute__ ((__section__(".l2.bss")));
-
-void resync_core_dcache(void)
-{
- unsigned int cpu = get_cpu();
- blackfin_invalidate_entire_dcache();
- dcache_invld_count[cpu]++;
- put_cpu();
-}
-EXPORT_SYMBOL(resync_core_dcache);
-#endif
-
-#ifdef CONFIG_HOTPLUG_CPU
-int __cpu_disable(void)
-{
- unsigned int cpu = smp_processor_id();
-
- if (cpu == 0)
- return -EPERM;
-
- set_cpu_online(cpu, false);
- return 0;
-}
-
-int __cpu_die(unsigned int cpu)
-{
- return cpu_wait_death(cpu, 5);
-}
-
-void cpu_die(void)
-{
- (void)cpu_report_death();
-
- atomic_dec(&init_mm.mm_users);
- atomic_dec(&init_mm.mm_count);
-
- local_irq_disable();
- platform_cpu_die();
-}
-#endif