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