1 /*
2 * Author: Andy Fleming <afleming@freescale.com>
3 * Kumar Gala <galak@kernel.crashing.org>
4 *
5 * Copyright 2006-2008 Freescale Semiconductor Inc.
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13 #include <linux/stddef.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/delay.h>
17 #include <linux/of.h>
18
19 #include <asm/machdep.h>
20 #include <asm/pgtable.h>
21 #include <asm/page.h>
22 #include <asm/mpic.h>
23 #include <asm/cacheflush.h>
24
25 #include <sysdev/fsl_soc.h>
26
27 extern volatile unsigned long __secondary_hold_acknowledge;
28 extern void __early_start(void);
29
30 #define BOOT_ENTRY_ADDR_UPPER 0
31 #define BOOT_ENTRY_ADDR_LOWER 1
32 #define BOOT_ENTRY_R3_UPPER 2
33 #define BOOT_ENTRY_R3_LOWER 3
34 #define BOOT_ENTRY_RESV 4
35 #define BOOT_ENTRY_PIR 5
36 #define BOOT_ENTRY_R6_UPPER 6
37 #define BOOT_ENTRY_R6_LOWER 7
38 #define NUM_BOOT_ENTRY 8
39 #define SIZE_BOOT_ENTRY (NUM_BOOT_ENTRY * sizeof(u32))
40
41 static void __init
smp_85xx_kick_cpu(int nr)42 smp_85xx_kick_cpu(int nr)
43 {
44 unsigned long flags;
45 const u64 *cpu_rel_addr;
46 __iomem u32 *bptr_vaddr;
47 struct device_node *np;
48 int n = 0;
49
50 WARN_ON (nr < 0 || nr >= NR_CPUS);
51
52 pr_debug("smp_85xx_kick_cpu: kick CPU #%d\n", nr);
53
54 local_irq_save(flags);
55
56 np = of_get_cpu_node(nr, NULL);
57 cpu_rel_addr = of_get_property(np, "cpu-release-addr", NULL);
58
59 if (cpu_rel_addr == NULL) {
60 printk(KERN_ERR "No cpu-release-addr for cpu %d\n", nr);
61 local_irq_restore(flags);
62 return;
63 }
64
65 /* Map the spin table */
66 bptr_vaddr = ioremap(*cpu_rel_addr, SIZE_BOOT_ENTRY);
67
68 out_be32(bptr_vaddr + BOOT_ENTRY_PIR, nr);
69 out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start));
70
71 /* Wait a bit for the CPU to ack. */
72 while ((__secondary_hold_acknowledge != nr) && (++n < 1000))
73 mdelay(1);
74
75 iounmap(bptr_vaddr);
76
77 local_irq_restore(flags);
78
79 pr_debug("waited %d msecs for CPU #%d.\n", n, nr);
80 }
81
82 static void __init
smp_85xx_setup_cpu(int cpu_nr)83 smp_85xx_setup_cpu(int cpu_nr)
84 {
85 mpic_setup_this_cpu();
86
87 /* Clear any pending timer interrupts */
88 mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);
89
90 /* Enable decrementer interrupt */
91 mtspr(SPRN_TCR, TCR_DIE);
92 }
93
94 struct smp_ops_t smp_85xx_ops = {
95 .message_pass = smp_mpic_message_pass,
96 .probe = smp_mpic_probe,
97 .kick_cpu = smp_85xx_kick_cpu,
98 .setup_cpu = smp_85xx_setup_cpu,
99 };
100
101 void __init
mpc85xx_smp_init(void)102 mpc85xx_smp_init(void)
103 {
104 smp_ops = &smp_85xx_ops;
105 }
106