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}
119

source code of linux/arch/powerpc/platforms/86xx/mpc86xx_smp.c