mirror of https://gitee.com/openkylin/linux.git
105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
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/*
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* Author: Andy Fleming <afleming@freescale.com>
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* Kumar Gala <galak@kernel.crashing.org>
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*
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* Copyright 2006-2008 Freescale Semiconductor Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/of.h>
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#include <asm/machdep.h>
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#include <asm/pgtable.h>
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#include <asm/page.h>
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#include <asm/mpic.h>
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#include <asm/cacheflush.h>
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#include <sysdev/fsl_soc.h>
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extern volatile unsigned long __secondary_hold_acknowledge;
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extern void __early_start(void);
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#define BOOT_ENTRY_ADDR_UPPER 0
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#define BOOT_ENTRY_ADDR_LOWER 1
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#define BOOT_ENTRY_R3_UPPER 2
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#define BOOT_ENTRY_R3_LOWER 3
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#define BOOT_ENTRY_RESV 4
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#define BOOT_ENTRY_PIR 5
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#define BOOT_ENTRY_R6_UPPER 6
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#define BOOT_ENTRY_R6_LOWER 7
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#define NUM_BOOT_ENTRY 8
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#define SIZE_BOOT_ENTRY (NUM_BOOT_ENTRY * sizeof(u32))
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static void __init
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smp_85xx_kick_cpu(int nr)
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{
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unsigned long flags;
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const u64 *cpu_rel_addr;
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__iomem u32 *bptr_vaddr;
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struct device_node *np;
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int n = 0;
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WARN_ON (nr < 0 || nr >= NR_CPUS);
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pr_debug("smp_85xx_kick_cpu: kick CPU #%d\n", nr);
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local_irq_save(flags);
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np = of_get_cpu_node(nr, NULL);
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cpu_rel_addr = of_get_property(np, "cpu-release-addr", NULL);
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if (cpu_rel_addr == NULL) {
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printk(KERN_ERR "No cpu-release-addr for cpu %d\n", nr);
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return;
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}
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/* Map the spin table */
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bptr_vaddr = ioremap(*cpu_rel_addr, SIZE_BOOT_ENTRY);
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out_be32(bptr_vaddr + BOOT_ENTRY_PIR, nr);
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out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start));
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/* Wait a bit for the CPU to ack. */
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while ((__secondary_hold_acknowledge != nr) && (++n < 1000))
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mdelay(1);
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iounmap(bptr_vaddr);
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local_irq_restore(flags);
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pr_debug("waited %d msecs for CPU #%d.\n", n, nr);
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}
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static void __init
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smp_85xx_setup_cpu(int cpu_nr)
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{
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mpic_setup_this_cpu();
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/* Clear any pending timer interrupts */
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mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);
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/* Enable decrementer interrupt */
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mtspr(SPRN_TCR, TCR_DIE);
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}
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struct smp_ops_t smp_85xx_ops = {
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.message_pass = smp_mpic_message_pass,
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.probe = smp_mpic_probe,
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.kick_cpu = smp_85xx_kick_cpu,
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.setup_cpu = smp_85xx_setup_cpu,
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};
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void __init
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mpc85xx_smp_init(void)
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{
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smp_ops = &smp_85xx_ops;
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}
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