2 * Author: Andy Fleming <afleming@freescale.com>
3 * Kumar Gala <galak@kernel.crashing.org>
5 * Copyright 2006-2008 Freescale Semiconductor Inc.
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.
13 #include <linux/stddef.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/delay.h>
18 #include <linux/kexec.h>
20 #include <asm/machdep.h>
21 #include <asm/pgtable.h>
24 #include <asm/cacheflush.h>
25 #include <asm/dbell.h>
27 #include <sysdev/fsl_soc.h>
28 #include <sysdev/mpic.h>
30 extern void __early_start(void);
32 #define BOOT_ENTRY_ADDR_UPPER 0
33 #define BOOT_ENTRY_ADDR_LOWER 1
34 #define BOOT_ENTRY_R3_UPPER 2
35 #define BOOT_ENTRY_R3_LOWER 3
36 #define BOOT_ENTRY_RESV 4
37 #define BOOT_ENTRY_PIR 5
38 #define BOOT_ENTRY_R6_UPPER 6
39 #define BOOT_ENTRY_R6_LOWER 7
40 #define NUM_BOOT_ENTRY 8
41 #define SIZE_BOOT_ENTRY (NUM_BOOT_ENTRY * sizeof(u32))
44 smp_85xx_kick_cpu(int nr)
47 const u64 *cpu_rel_addr;
48 __iomem u32 *bptr_vaddr;
49 struct device_node *np;
53 WARN_ON (nr < 0 || nr >= NR_CPUS);
55 pr_debug("smp_85xx_kick_cpu: kick CPU #%d\n", nr);
57 np = of_get_cpu_node(nr, NULL);
58 cpu_rel_addr = of_get_property(np, "cpu-release-addr", NULL);
60 if (cpu_rel_addr == NULL) {
61 printk(KERN_ERR "No cpu-release-addr for cpu %d\n", nr);
66 * A secondary core could be in a spinloop in the bootpage
67 * (0xfffff000), somewhere in highmem, or somewhere in lowmem.
68 * The bootpage and highmem can be accessed via ioremap(), but
69 * we need to directly access the spinloop if its in lowmem.
71 ioremappable = *cpu_rel_addr > virt_to_phys(high_memory);
73 /* Map the spin table */
75 bptr_vaddr = ioremap(*cpu_rel_addr, SIZE_BOOT_ENTRY);
77 bptr_vaddr = phys_to_virt(*cpu_rel_addr);
79 local_irq_save(flags);
81 out_be32(bptr_vaddr + BOOT_ENTRY_PIR, nr);
83 out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start));
86 flush_dcache_range((ulong)bptr_vaddr,
87 (ulong)(bptr_vaddr + SIZE_BOOT_ENTRY));
89 /* Wait a bit for the CPU to ack. */
90 while ((__secondary_hold_acknowledge != nr) && (++n < 1000))
93 out_be64((u64 *)(bptr_vaddr + BOOT_ENTRY_ADDR_UPPER),
94 __pa((u64)*((unsigned long long *) generic_secondary_smp_init)));
96 smp_generic_kick_cpu(nr);
99 local_irq_restore(flags);
104 pr_debug("waited %d msecs for CPU #%d.\n", n, nr);
108 smp_85xx_setup_cpu(int cpu_nr)
110 mpic_setup_this_cpu();
111 if (cpu_has_feature(CPU_FTR_DBELL))
112 doorbell_setup_this_cpu();
115 struct smp_ops_t smp_85xx_ops = {
116 .kick_cpu = smp_85xx_kick_cpu,
118 .give_timebase = smp_generic_give_timebase,
119 .take_timebase = smp_generic_take_timebase,
124 atomic_t kexec_down_cpus = ATOMIC_INIT(0);
126 void mpc85xx_smp_kexec_cpu_down(int crash_shutdown, int secondary)
131 atomic_inc(&kexec_down_cpus);
137 static void mpc85xx_smp_kexec_down(void *arg)
139 if (ppc_md.kexec_cpu_down)
140 ppc_md.kexec_cpu_down(0,1);
143 static void mpc85xx_smp_machine_kexec(struct kimage *image)
145 int timeout = INT_MAX;
146 int i, num_cpus = num_present_cpus();
149 if (image->type == KEXEC_TYPE_DEFAULT)
150 smp_call_function(mpc85xx_smp_kexec_down, NULL, 0);
152 while ( (atomic_read(&kexec_down_cpus) != (num_cpus - 1)) &&
159 printk(KERN_ERR "Unable to bring down secondary cpu(s)");
161 for (i = 0; i < num_cpus; i++)
163 if ( i == smp_processor_id() ) continue;
167 default_machine_kexec(image);
169 #endif /* CONFIG_KEXEC */
171 void __init mpc85xx_smp_init(void)
173 struct device_node *np;
175 np = of_find_node_by_type(NULL, "open-pic");
177 smp_85xx_ops.probe = smp_mpic_probe;
178 smp_85xx_ops.setup_cpu = smp_85xx_setup_cpu;
179 smp_85xx_ops.message_pass = smp_mpic_message_pass;
182 if (cpu_has_feature(CPU_FTR_DBELL))
183 smp_85xx_ops.message_pass = doorbell_message_pass;
185 BUG_ON(!smp_85xx_ops.message_pass);
187 smp_ops = &smp_85xx_ops;
190 ppc_md.kexec_cpu_down = mpc85xx_smp_kexec_cpu_down;
191 ppc_md.machine_kexec = mpc85xx_smp_machine_kexec;