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/code-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