470 lines
11 KiB
C
470 lines
11 KiB
C
/* 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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#include <asm/head.h>
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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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#include <linux/gfp.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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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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#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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#ifdef CONFIG_SPARC_LEON
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#include "irq.h"
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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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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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static void smp_setup_percpu_timer(void);
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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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local_flush_cache_all();
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local_flush_tlb_all();
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leon_configure_cache_smp();
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/* Get our local ticker going. */
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smp_setup_percpu_timer();
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calibrate_delay();
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smp_store_cpu_info(cpuid);
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local_flush_cache_all();
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local_flush_tlb_all();
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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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local_flush_cache_all();
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local_flush_tlb_all();
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cpu_probe();
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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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/* 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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while (!cpu_isset(cpuid, smp_commenced_mask))
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mb();
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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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* Cycle through the processors asking the PROM to start each one.
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*/
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extern struct linux_prom_registers smp_penguin_ctable;
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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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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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local_flush_cache_all();
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local_flush_tlb_all();
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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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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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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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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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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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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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leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
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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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int __cpuinit leon_boot_one_cpu(int i)
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{
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struct task_struct *p;
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int timeout;
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/* Cook up an idler for this guy. */
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p = fork_idle(i);
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current_set[i] = task_thread_info(p);
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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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/* 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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LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
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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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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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local_flush_cache_all();
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return 0;
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}
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void __init leon_smp_done(void)
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{
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int i, first;
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int *prev;
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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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/* 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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void leon_irq_rotate(int cpu)
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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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static DEFINE_SPINLOCK(cross_call_lock);
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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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spin_lock_irqsave(&cross_call_lock, flags);
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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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__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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/* 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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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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register int i;
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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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while (!ccall_info.processors_in[i])
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barrier();
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} while (++i <= high);
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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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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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spin_unlock_irqrestore(&cross_call_lock, flags);
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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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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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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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old_regs = set_irq_regs(regs);
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leon_clear_profile_irq(cpu);
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profile_tick(CPU_PROFILING);
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if (!--prof_counter(cpu)) {
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int user = user_mode(regs);
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irq_enter();
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update_process_times(user);
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irq_exit();
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prof_counter(cpu) = prof_multiplier(cpu);
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}
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set_irq_regs(old_regs);
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}
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static void __init smp_setup_percpu_timer(void)
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{
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int cpu = smp_processor_id();
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prof_counter(cpu) = prof_multiplier(cpu) = 1;
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}
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void __init leon_blackbox_id(unsigned *addr)
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{
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int rd = *addr & 0x3e000000;
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int rs1 = rd >> 11;
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/* patch places where ___b_hard_smp_processor_id appears */
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addr[0] = 0x81444000 | rd; /* rd %asr17, reg */
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addr[1] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */
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addr[2] = 0x01000000; /* nop */
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}
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void __init leon_blackbox_current(unsigned *addr)
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{
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int rd = *addr & 0x3e000000;
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int rs1 = rd >> 11;
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/* patch LOAD_CURRENT macro where ___b_load_current appears */
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addr[0] = 0x81444000 | rd; /* rd %asr17, reg */
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addr[2] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */
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addr[4] = 0x81282002 | rd | rs1; /* sll reg, 0x2, reg */
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}
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/*
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* CPU idle callback function
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* See .../arch/sparc/kernel/process.c
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*/
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void pmc_leon_idle(void)
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{
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__asm__ volatile ("mov %g0, %asr19");
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}
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void __init leon_init_smp(void)
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{
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/* Patch ipi15 trap table */
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t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
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BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id);
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BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current);
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BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
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BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
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BTFIXUPCALL_NORM);
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#ifndef PMC_NO_IDLE
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/* Assign power management IDLE handler */
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pm_idle = pmc_leon_idle;
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printk(KERN_INFO "leon: power management initialized\n");
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#endif
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}
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#endif /* CONFIG_SPARC_LEON */
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