mpc86xx_smp.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Author: Xianghua Xiao <x.xiao@freescale.com>
  4 *         Zhang Wei <wei.zhang@freescale.com>
  5 *
  6 * Copyright 2006 Freescale Semiconductor Inc.
  7 */
  8
  9#include <linux/stddef.h>
 10#include <linux/kernel.h>
 11#include <linux/init.h>
 12#include <linux/delay.h>
 13#include <linux/pgtable.h>
 14
 15#include <asm/text-patching.h>
 16#include <asm/page.h>
 17#include <asm/pci-bridge.h>
 18#include <asm/mpic.h>
 19#include <asm/cacheflush.h>
 20#include <asm/inst.h>
 21
 22#include <sysdev/fsl_soc.h>
 23
 24#include "mpc86xx.h"
 25
 26extern void __secondary_start_mpc86xx(void);
 27
 28#define MCM_PORT_CONFIG_OFFSET	0x10
 29
 30/* Offset from CCSRBAR */
 31#define MPC86xx_MCM_OFFSET      (0x1000)
 32#define MPC86xx_MCM_SIZE        (0x1000)
 33
 34static void __init
 35smp_86xx_release_core(int nr)
 36{
 37	__be32 __iomem *mcm_vaddr;
 38	unsigned long pcr;
 39
 40	if (nr < 0 || nr >= NR_CPUS)
 41		return;
 42
 43	/*
 44	 * Startup Core #nr.
 45	 */
 46	mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET,
 47			    MPC86xx_MCM_SIZE);
 48	pcr = in_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2));
 49	pcr |= 1 << (nr + 24);
 50	out_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2), pcr);
 51
 52	iounmap(mcm_vaddr);
 53}
 54
 55
 56static int __init
 57smp_86xx_kick_cpu(int nr)
 58{
 59	unsigned int save_vector;
 60	unsigned long target, flags;
 61	int n = 0;
 62	unsigned int *vector = (unsigned int *)(KERNELBASE + 0x100);
 63
 64	if (nr < 0 || nr >= NR_CPUS)
 65		return -ENOENT;
 66
 67	pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr);
 68
 69	local_irq_save(flags);
 70
 71	/* Save reset vector */
 72	save_vector = *vector;
 73
 74	/* Setup fake reset vector to call __secondary_start_mpc86xx. */
 75	target = (unsigned long) __secondary_start_mpc86xx;
 76	patch_branch(vector, target, BRANCH_SET_LINK);
 77
 78	/* Kick that CPU */
 79	smp_86xx_release_core(nr);
 80
 81	/* Wait a bit for the CPU to take the exception. */
 82	while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000))
 83		mdelay(1);
 84
 85	/* Restore the exception vector */
 86	patch_instruction(vector, ppc_inst(save_vector));
 87
 88	local_irq_restore(flags);
 89
 90	pr_debug("wait CPU #%d for %d msecs.\n", nr, n);
 91
 92	return 0;
 93}
 94
 95
 96static void __init
 97smp_86xx_setup_cpu(int cpu_nr)
 98{
 99	mpic_setup_this_cpu();
100}
101
102
103struct smp_ops_t smp_86xx_ops = {
104	.cause_nmi_ipi = NULL,
105	.message_pass = smp_mpic_message_pass,
106	.probe = smp_mpic_probe,
107	.kick_cpu = smp_86xx_kick_cpu,
108	.setup_cpu = smp_86xx_setup_cpu,
109	.take_timebase = smp_generic_take_timebase,
110	.give_timebase = smp_generic_give_timebase,
111};
112
113
114void __init
115mpc86xx_smp_init(void)
116{
117	smp_ops = &smp_86xx_ops;
118}