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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/platforms/86xx/mpc86xx_smp.c
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// SPDX-License-Identifier: GPL-2.0-or-later

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/*

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 * Author: Xianghua Xiao <[email protected]>

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 *         Zhang Wei <[email protected]>

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 *

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 * Copyright 2006 Freescale Semiconductor Inc.

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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/pgtable.h>

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#include <asm/text-patching.h>

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#include <asm/page.h>

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#include <asm/pci-bridge.h>

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#include <asm/mpic.h>

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#include <asm/cacheflush.h>

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#include <asm/inst.h>

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#include <sysdev/fsl_soc.h>

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#include "mpc86xx.h"

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extern void __secondary_start_mpc86xx(void);

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#define MCM_PORT_CONFIG_OFFSET	0x10

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/* Offset from CCSRBAR */

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#define MPC86xx_MCM_OFFSET      (0x1000)

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#define MPC86xx_MCM_SIZE        (0x1000)

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static void __init

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smp_86xx_release_core(int nr)

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{

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	__be32 __iomem *mcm_vaddr;

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	unsigned long pcr;

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	if (nr < 0 || nr >= NR_CPUS)

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		return;

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	/*

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	 * Startup Core #nr.

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	 */

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	mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET,

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			    MPC86xx_MCM_SIZE);

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	pcr = in_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2));

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	pcr |= 1 << (nr + 24);

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	out_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2), pcr);

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	iounmap(mcm_vaddr);

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}

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static int __init

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smp_86xx_kick_cpu(int nr)

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{

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	unsigned int save_vector;

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	unsigned long target, flags;

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	int n = 0;

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	unsigned int *vector = (unsigned int *)(KERNELBASE + 0x100);

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	if (nr < 0 || nr >= NR_CPUS)

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		return -ENOENT;

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	pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr);

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	local_irq_save(flags);

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	/* Save reset vector */

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	save_vector = *vector;

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	/* Setup fake reset vector to call __secondary_start_mpc86xx. */

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	target = (unsigned long) __secondary_start_mpc86xx;

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	patch_branch(vector, target, BRANCH_SET_LINK);

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	/* Kick that CPU */

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	smp_86xx_release_core(nr);

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	/* Wait a bit for the CPU to take the exception. */

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	while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000))

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		mdelay(1);

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	/* Restore the exception vector */

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	patch_instruction(vector, ppc_inst(save_vector));

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	local_irq_restore(flags);

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	pr_debug("wait CPU #%d for %d msecs.\n", nr, n);

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	return 0;

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}

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static void __init

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smp_86xx_setup_cpu(int cpu_nr)

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{

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	mpic_setup_this_cpu();

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}

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struct smp_ops_t smp_86xx_ops = {

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	.cause_nmi_ipi = NULL,

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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_86xx_kick_cpu,

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	.setup_cpu = smp_86xx_setup_cpu,

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	.take_timebase = smp_generic_take_timebase,

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	.give_timebase = smp_generic_give_timebase,

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};

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void __init

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mpc86xx_smp_init(void)

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{

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	smp_ops = &smp_86xx_ops;

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}

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