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@@ -0,0 +1,468 @@
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+/* leon_smp.c: Sparc-Leon SMP support.
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+ *
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+ * based on sun4m_smp.c
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+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
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+ * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
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+ * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
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+ */
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+
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+#include <asm/head.h>
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+
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+#include <linux/kernel.h>
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+#include <linux/sched.h>
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+#include <linux/threads.h>
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+#include <linux/smp.h>
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+#include <linux/smp_lock.h>
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+#include <linux/interrupt.h>
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+#include <linux/kernel_stat.h>
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+#include <linux/init.h>
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+#include <linux/spinlock.h>
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+#include <linux/mm.h>
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+#include <linux/swap.h>
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+#include <linux/profile.h>
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+#include <linux/pm.h>
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+#include <linux/delay.h>
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+
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+#include <asm/cacheflush.h>
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+#include <asm/tlbflush.h>
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+
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+#include <asm/ptrace.h>
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+#include <asm/atomic.h>
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+#include <asm/irq_regs.h>
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+
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+#include <asm/delay.h>
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+#include <asm/irq.h>
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+#include <asm/page.h>
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+#include <asm/pgalloc.h>
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+#include <asm/pgtable.h>
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+#include <asm/oplib.h>
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+#include <asm/cpudata.h>
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+#include <asm/asi.h>
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+#include <asm/leon.h>
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+#include <asm/leon_amba.h>
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+
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+#ifdef CONFIG_SPARC_LEON
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+
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+#include "irq.h"
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+
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+extern ctxd_t *srmmu_ctx_table_phys;
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+static int smp_processors_ready;
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+extern volatile unsigned long cpu_callin_map[NR_CPUS];
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+extern unsigned char boot_cpu_id;
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+extern cpumask_t smp_commenced_mask;
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+void __init leon_configure_cache_smp(void);
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+
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+static inline unsigned long do_swap(volatile unsigned long *ptr,
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+ unsigned long val)
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+{
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+ __asm__ __volatile__("swapa [%1] %2, %0\n\t" : "=&r"(val)
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+ : "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
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+ : "memory");
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+ return val;
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+}
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+
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+static void smp_setup_percpu_timer(void);
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+
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+void __cpuinit leon_callin(void)
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+{
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+ int cpuid = hard_smpleon_processor_id();
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+
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+ local_flush_cache_all();
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+ local_flush_tlb_all();
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+ leon_configure_cache_smp();
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+
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+ /* Get our local ticker going. */
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+ smp_setup_percpu_timer();
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+
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+ calibrate_delay();
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+ smp_store_cpu_info(cpuid);
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+
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+ local_flush_cache_all();
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+ local_flush_tlb_all();
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+
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+ /*
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+ * Unblock the master CPU _only_ when the scheduler state
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+ * of all secondary CPUs will be up-to-date, so after
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+ * the SMP initialization the master will be just allowed
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+ * to call the scheduler code.
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+ * Allow master to continue.
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+ */
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+ do_swap(&cpu_callin_map[cpuid], 1);
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+
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+ local_flush_cache_all();
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+ local_flush_tlb_all();
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+
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+ cpu_probe();
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+
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+ /* Fix idle thread fields. */
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+ __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(¤t_set[cpuid])
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+ : "memory" /* paranoid */);
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+
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+ /* Attach to the address space of init_task. */
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+ atomic_inc(&init_mm.mm_count);
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+ current->active_mm = &init_mm;
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+
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+ while (!cpu_isset(cpuid, smp_commenced_mask))
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+ mb();
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+
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+ local_irq_enable();
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+ cpu_set(cpuid, cpu_online_map);
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+}
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+
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+/*
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+ * Cycle through the processors asking the PROM to start each one.
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+ */
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+
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+extern struct linux_prom_registers smp_penguin_ctable;
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+
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+void __init leon_configure_cache_smp(void)
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+{
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+ unsigned long cfg = sparc_leon3_get_dcachecfg();
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+ int me = smp_processor_id();
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+
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+ if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
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+ printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
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+ (unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
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+ (unsigned int)cfg, (unsigned int)me);
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+ sparc_leon3_disable_cache();
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+ } else {
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+ if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
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+ sparc_leon3_enable_snooping();
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+ } else {
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+ printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
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+ me);
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+ sparc_leon3_disable_cache();
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+ }
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+ }
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+
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+ local_flush_cache_all();
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+ local_flush_tlb_all();
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+}
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+
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+void leon_smp_setbroadcast(unsigned int mask)
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+{
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+ int broadcast =
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+ ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
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+ LEON3_IRQMPSTATUS_BROADCAST) & 1);
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+ if (!broadcast) {
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+ prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
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+ leon_smp_nrcpus());
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+ if (leon_smp_nrcpus() > 1) {
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+ BUG();
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+ } else {
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+ prom_printf("continue anyway\n");
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+ return;
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+ }
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+ }
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+ LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
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+}
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+
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+unsigned int leon_smp_getbroadcast(void)
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+{
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+ unsigned int mask;
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+ mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast));
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+ return mask;
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+}
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+
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+int leon_smp_nrcpus(void)
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+{
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+ int nrcpu =
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+ ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
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+ LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
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+ return nrcpu;
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+}
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+
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+void __init leon_boot_cpus(void)
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+{
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+ int nrcpu = leon_smp_nrcpus();
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+ int me = smp_processor_id();
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+
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+ printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x \n", (unsigned int)me,
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+ (unsigned int)nrcpu, (unsigned int)NR_CPUS,
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+ (unsigned int)&(leon3_irqctrl_regs->mpstatus));
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+
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+ leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
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+ leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
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+ leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, me);
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+
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+ leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
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+
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+ leon_configure_cache_smp();
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+ smp_setup_percpu_timer();
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+ local_flush_cache_all();
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+
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+}
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+
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+int __cpuinit leon_boot_one_cpu(int i)
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+{
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+
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+ struct task_struct *p;
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+ int timeout;
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+
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+ /* Cook up an idler for this guy. */
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+ p = fork_idle(i);
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+
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+ current_set[i] = task_thread_info(p);
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+
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+ /* See trampoline.S:leon_smp_cpu_startup for details...
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+ * Initialize the contexts table
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+ * Since the call to prom_startcpu() trashes the structure,
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+ * we need to re-initialize it for each cpu
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+ */
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+ smp_penguin_ctable.which_io = 0;
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+ smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys;
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+ smp_penguin_ctable.reg_size = 0;
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+
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+ /* whirrr, whirrr, whirrrrrrrrr... */
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+ printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
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+ (unsigned int)&leon3_irqctrl_regs->mpstatus);
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+ local_flush_cache_all();
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+
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+ LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
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+
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+ /* wheee... it's going... */
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+ for (timeout = 0; timeout < 10000; timeout++) {
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+ if (cpu_callin_map[i])
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+ break;
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+ udelay(200);
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+ }
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+ printk(KERN_INFO "Started CPU %d \n", (unsigned int)i);
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+
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+ if (!(cpu_callin_map[i])) {
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+ printk(KERN_ERR "Processor %d is stuck.\n", i);
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+ return -ENODEV;
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+ } else {
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+ leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
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+ leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
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+ leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, i);
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+ }
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+
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+ local_flush_cache_all();
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+ return 0;
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+}
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+
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+void __init leon_smp_done(void)
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+{
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+
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+ int i, first;
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+ int *prev;
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+
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+ /* setup cpu list for irq rotation */
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+ first = 0;
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+ prev = &first;
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+ for (i = 0; i < NR_CPUS; i++) {
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+ if (cpu_online(i)) {
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+ *prev = i;
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+ prev = &cpu_data(i).next;
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+ }
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+ }
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+ *prev = first;
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+ local_flush_cache_all();
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+
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+ /* Free unneeded trap tables */
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+ if (!cpu_isset(1, cpu_present_map)) {
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+ ClearPageReserved(virt_to_page(trapbase_cpu1));
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+ init_page_count(virt_to_page(trapbase_cpu1));
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+ free_page((unsigned long)trapbase_cpu1);
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+ totalram_pages++;
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+ num_physpages++;
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+ }
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+ if (!cpu_isset(2, cpu_present_map)) {
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+ ClearPageReserved(virt_to_page(trapbase_cpu2));
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+ init_page_count(virt_to_page(trapbase_cpu2));
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+ free_page((unsigned long)trapbase_cpu2);
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+ totalram_pages++;
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+ num_physpages++;
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+ }
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+ if (!cpu_isset(3, cpu_present_map)) {
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+ ClearPageReserved(virt_to_page(trapbase_cpu3));
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+ init_page_count(virt_to_page(trapbase_cpu3));
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+ free_page((unsigned long)trapbase_cpu3);
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+ totalram_pages++;
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+ num_physpages++;
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+ }
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+ /* Ok, they are spinning and ready to go. */
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+ smp_processors_ready = 1;
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+
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+}
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+
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+void leon_irq_rotate(int cpu)
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+{
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+}
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+
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+static struct smp_funcall {
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+ smpfunc_t func;
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+ unsigned long arg1;
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+ unsigned long arg2;
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+ unsigned long arg3;
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+ unsigned long arg4;
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+ unsigned long arg5;
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+ unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */
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+ unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
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+} ccall_info;
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+
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+static DEFINE_SPINLOCK(cross_call_lock);
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+
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+/* Cross calls must be serialized, at least currently. */
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+static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
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+ unsigned long arg2, unsigned long arg3,
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+ unsigned long arg4)
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+{
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+ if (smp_processors_ready) {
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+ register int high = NR_CPUS - 1;
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&cross_call_lock, flags);
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+
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+ {
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+ /* If you make changes here, make sure gcc generates proper code... */
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+ register smpfunc_t f asm("i0") = func;
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+ register unsigned long a1 asm("i1") = arg1;
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+ register unsigned long a2 asm("i2") = arg2;
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+ register unsigned long a3 asm("i3") = arg3;
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+ register unsigned long a4 asm("i4") = arg4;
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+ register unsigned long a5 asm("i5") = 0;
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+
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+ __asm__ __volatile__("std %0, [%6]\n\t"
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+ "std %2, [%6 + 8]\n\t"
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+ "std %4, [%6 + 16]\n\t" : :
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+ "r"(f), "r"(a1), "r"(a2), "r"(a3),
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+ "r"(a4), "r"(a5),
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+ "r"(&ccall_info.func));
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+ }
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+
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+ /* Init receive/complete mapping, plus fire the IPI's off. */
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+ {
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+ register int i;
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+
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+ cpu_clear(smp_processor_id(), mask);
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+ cpus_and(mask, cpu_online_map, mask);
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+ for (i = 0; i <= high; i++) {
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+ if (cpu_isset(i, mask)) {
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+ ccall_info.processors_in[i] = 0;
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+ ccall_info.processors_out[i] = 0;
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+ set_cpu_int(i, LEON3_IRQ_CROSS_CALL);
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+
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+ }
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+ }
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+ }
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+
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+ {
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+ register int i;
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+
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+ i = 0;
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+ do {
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+ if (!cpu_isset(i, mask))
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+ continue;
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+
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+ while (!ccall_info.processors_in[i])
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+ barrier();
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+ } while (++i <= high);
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+
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+ i = 0;
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+ do {
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+ if (!cpu_isset(i, mask))
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+ continue;
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+
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+ while (!ccall_info.processors_out[i])
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+ barrier();
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+ } while (++i <= high);
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+ }
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+
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+ spin_unlock_irqrestore(&cross_call_lock, flags);
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+ }
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+}
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+
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+/* Running cross calls. */
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+void leon_cross_call_irq(void)
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+{
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+ int i = smp_processor_id();
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+
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+ ccall_info.processors_in[i] = 1;
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+ ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
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+ ccall_info.arg4, ccall_info.arg5);
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+ ccall_info.processors_out[i] = 1;
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+}
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+
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+void leon_percpu_timer_interrupt(struct pt_regs *regs)
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+{
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+ struct pt_regs *old_regs;
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+ int cpu = smp_processor_id();
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+
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+ old_regs = set_irq_regs(regs);
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+
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+ leon_clear_profile_irq(cpu);
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+
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+ profile_tick(CPU_PROFILING);
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+
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+ if (!--prof_counter(cpu)) {
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+ int user = user_mode(regs);
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+
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+ irq_enter();
|
|
|
+ update_process_times(user);
|
|
|
+ irq_exit();
|
|
|
+
|
|
|
+ prof_counter(cpu) = prof_multiplier(cpu);
|
|
|
+ }
|
|
|
+ set_irq_regs(old_regs);
|
|
|
+}
|
|
|
+
|
|
|
+static void __init smp_setup_percpu_timer(void)
|
|
|
+{
|
|
|
+ int cpu = smp_processor_id();
|
|
|
+
|
|
|
+ prof_counter(cpu) = prof_multiplier(cpu) = 1;
|
|
|
+}
|
|
|
+
|
|
|
+void __init leon_blackbox_id(unsigned *addr)
|
|
|
+{
|
|
|
+ int rd = *addr & 0x3e000000;
|
|
|
+ int rs1 = rd >> 11;
|
|
|
+
|
|
|
+ /* patch places where ___b_hard_smp_processor_id appears */
|
|
|
+ addr[0] = 0x81444000 | rd; /* rd %asr17, reg */
|
|
|
+ addr[1] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */
|
|
|
+ addr[2] = 0x01000000; /* nop */
|
|
|
+}
|
|
|
+
|
|
|
+void __init leon_blackbox_current(unsigned *addr)
|
|
|
+{
|
|
|
+ int rd = *addr & 0x3e000000;
|
|
|
+ int rs1 = rd >> 11;
|
|
|
+
|
|
|
+ /* patch LOAD_CURRENT macro where ___b_load_current appears */
|
|
|
+ addr[0] = 0x81444000 | rd; /* rd %asr17, reg */
|
|
|
+ addr[2] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */
|
|
|
+ addr[4] = 0x81282002 | rd | rs1; /* sll reg, 0x2, reg */
|
|
|
+
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * CPU idle callback function
|
|
|
+ * See .../arch/sparc/kernel/process.c
|
|
|
+ */
|
|
|
+void pmc_leon_idle(void)
|
|
|
+{
|
|
|
+ __asm__ volatile ("mov %g0, %asr19");
|
|
|
+}
|
|
|
+
|
|
|
+void __init leon_init_smp(void)
|
|
|
+{
|
|
|
+ /* Patch ipi15 trap table */
|
|
|
+ t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
|
|
|
+
|
|
|
+ BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id);
|
|
|
+ BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current);
|
|
|
+ BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
|
|
|
+ BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
|
|
|
+ BTFIXUPCALL_NORM);
|
|
|
+
|
|
|
+#ifndef PMC_NO_IDLE
|
|
|
+ /* Assign power management IDLE handler */
|
|
|
+ pm_idle = pmc_leon_idle;
|
|
|
+ printk(KERN_INFO "leon: power management initialized\n");
|
|
|
+#endif
|
|
|
+
|
|
|
+}
|
|
|
+
|
|
|
+#endif /* CONFIG_SPARC_LEON */
|
Konrad Eisele