2 * Author: Andy Fleming <afleming@freescale.com>
3 * Kumar Gala <galak@kernel.crashing.org>
5 * Copyright 2006-2008, 2011 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>
19 #include <linux/highmem.h>
21 #include <asm/machdep.h>
22 #include <asm/pgtable.h>
25 #include <asm/cacheflush.h>
26 #include <asm/dbell.h>
28 #include <sysdev/fsl_soc.h>
29 #include <sysdev/mpic.h>
31 extern void __early_start(void);
33 #define BOOT_ENTRY_ADDR_UPPER 0
34 #define BOOT_ENTRY_ADDR_LOWER 1
35 #define BOOT_ENTRY_R3_UPPER 2
36 #define BOOT_ENTRY_R3_LOWER 3
37 #define BOOT_ENTRY_RESV 4
38 #define BOOT_ENTRY_PIR 5
39 #define BOOT_ENTRY_R6_UPPER 6
40 #define BOOT_ENTRY_R6_LOWER 7
41 #define NUM_BOOT_ENTRY 8
42 #define SIZE_BOOT_ENTRY (NUM_BOOT_ENTRY * sizeof(u32))
45 smp_85xx_kick_cpu(int nr)
48 const u64 *cpu_rel_addr;
49 __iomem u32 *bptr_vaddr;
50 struct device_node *np;
51 int n = 0, hw_cpu = get_hard_smp_processor_id(nr);
54 WARN_ON(nr < 0 || nr >= NR_CPUS);
55 WARN_ON(hw_cpu < 0 || hw_cpu >= NR_CPUS);
57 pr_debug("smp_85xx_kick_cpu: kick CPU #%d\n", nr);
59 np = of_get_cpu_node(nr, NULL);
60 cpu_rel_addr = of_get_property(np, "cpu-release-addr", NULL);
62 if (cpu_rel_addr == NULL) {
63 printk(KERN_ERR "No cpu-release-addr for cpu %d\n", nr);
68 * A secondary core could be in a spinloop in the bootpage
69 * (0xfffff000), somewhere in highmem, or somewhere in lowmem.
70 * The bootpage and highmem can be accessed via ioremap(), but
71 * we need to directly access the spinloop if its in lowmem.
73 ioremappable = *cpu_rel_addr > virt_to_phys(high_memory);
75 /* Map the spin table */
77 bptr_vaddr = ioremap(*cpu_rel_addr, SIZE_BOOT_ENTRY);
79 bptr_vaddr = phys_to_virt(*cpu_rel_addr);
81 local_irq_save(flags);
83 out_be32(bptr_vaddr + BOOT_ENTRY_PIR, hw_cpu);
85 out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start));
88 flush_dcache_range((ulong)bptr_vaddr,
89 (ulong)(bptr_vaddr + SIZE_BOOT_ENTRY));
91 /* Wait a bit for the CPU to ack. */
92 while ((__secondary_hold_acknowledge != hw_cpu) && (++n < 1000))
95 smp_generic_kick_cpu(nr);
97 out_be64((u64 *)(bptr_vaddr + BOOT_ENTRY_ADDR_UPPER),
98 __pa((u64)*((unsigned long long *) generic_secondary_smp_init)));
101 flush_dcache_range((ulong)bptr_vaddr,
102 (ulong)(bptr_vaddr + SIZE_BOOT_ENTRY));
105 local_irq_restore(flags);
110 pr_debug("waited %d msecs for CPU #%d.\n", n, nr);
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 map_and_flush(unsigned long paddr)
145 struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
146 unsigned long kaddr = (unsigned long)kmap(page);
148 flush_dcache_range(kaddr, kaddr + PAGE_SIZE);
153 * Before we reset the other cores, we need to flush relevant cache
154 * out to memory so we don't get anything corrupted, some of these flushes
155 * are performed out of an overabundance of caution as interrupts are not
156 * disabled yet and we can switch cores
158 static void mpc85xx_smp_flush_dcache_kexec(struct kimage *image)
160 kimage_entry_t *ptr, entry;
164 if (image->type == KEXEC_TYPE_DEFAULT) {
165 /* normal kexec images are stored in temporary pages */
166 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
167 ptr = (entry & IND_INDIRECTION) ?
168 phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
169 if (!(entry & IND_DESTINATION)) {
170 map_and_flush(entry);
173 /* flush out last IND_DONE page */
174 map_and_flush(entry);
176 /* crash type kexec images are copied to the crash region */
177 for (i = 0; i < image->nr_segments; i++) {
178 struct kexec_segment *seg = &image->segment[i];
179 for (paddr = seg->mem; paddr < seg->mem + seg->memsz;
180 paddr += PAGE_SIZE) {
181 map_and_flush(paddr);
186 /* also flush the kimage struct to be passed in as well */
187 flush_dcache_range((unsigned long)image,
188 (unsigned long)image + sizeof(*image));
191 static void mpc85xx_smp_machine_kexec(struct kimage *image)
193 int timeout = INT_MAX;
194 int i, num_cpus = num_present_cpus();
196 mpc85xx_smp_flush_dcache_kexec(image);
198 if (image->type == KEXEC_TYPE_DEFAULT)
199 smp_call_function(mpc85xx_smp_kexec_down, NULL, 0);
201 while ( (atomic_read(&kexec_down_cpus) != (num_cpus - 1)) &&
208 printk(KERN_ERR "Unable to bring down secondary cpu(s)");
210 for_each_online_cpu(i)
212 if ( i == smp_processor_id() ) continue;
216 default_machine_kexec(image);
218 #endif /* CONFIG_KEXEC */
221 smp_85xx_setup_cpu(int cpu_nr)
223 if (smp_85xx_ops.probe == smp_mpic_probe)
224 mpic_setup_this_cpu();
226 if (cpu_has_feature(CPU_FTR_DBELL))
227 doorbell_setup_this_cpu();
230 void __init mpc85xx_smp_init(void)
232 struct device_node *np;
234 smp_85xx_ops.setup_cpu = smp_85xx_setup_cpu;
236 np = of_find_node_by_type(NULL, "open-pic");
238 smp_85xx_ops.probe = smp_mpic_probe;
239 smp_85xx_ops.message_pass = smp_mpic_message_pass;
242 if (cpu_has_feature(CPU_FTR_DBELL)) {
244 * If left NULL, .message_pass defaults to
245 * smp_muxed_ipi_message_pass
247 smp_85xx_ops.message_pass = NULL;
248 smp_85xx_ops.cause_ipi = doorbell_cause_ipi;
251 smp_ops = &smp_85xx_ops;
254 ppc_md.kexec_cpu_down = mpc85xx_smp_kexec_cpu_down;
255 ppc_md.machine_kexec = mpc85xx_smp_machine_kexec;