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 
26 extern 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 
34 static void __init
35 smp_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 
56 static int __init
57 smp_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((struct ppc_inst *)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((struct ppc_inst *)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 
96 static void __init
97 smp_86xx_setup_cpu(int cpu_nr)
98 {
99 	mpic_setup_this_cpu();
100 }
101 
102 
103 struct 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 
114 void __init
115 mpc86xx_smp_init(void)
116 {
117 	smp_ops = &smp_86xx_ops;
118 }
119