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Linux/arch/powerpc/platforms/85xx/smp.c

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  1 /*
  2  * Author: Andy Fleming <afleming@freescale.com>
  3  *         Kumar Gala <galak@kernel.crashing.org>
  4  *
  5  * Copyright 2006-2008, 2011 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 #include <linux/kexec.h>
 19 #include <linux/highmem.h>
 20 
 21 #include <asm/machdep.h>
 22 #include <asm/pgtable.h>
 23 #include <asm/page.h>
 24 #include <asm/mpic.h>
 25 #include <asm/cacheflush.h>
 26 #include <asm/dbell.h>
 27 
 28 #include <sysdev/fsl_soc.h>
 29 #include <sysdev/mpic.h>
 30 #include "smp.h"
 31 
 32 extern void __early_start(void);
 33 
 34 #define BOOT_ENTRY_ADDR_UPPER   0
 35 #define BOOT_ENTRY_ADDR_LOWER   1
 36 #define BOOT_ENTRY_R3_UPPER     2
 37 #define BOOT_ENTRY_R3_LOWER     3
 38 #define BOOT_ENTRY_RESV         4
 39 #define BOOT_ENTRY_PIR          5
 40 #define BOOT_ENTRY_R6_UPPER     6
 41 #define BOOT_ENTRY_R6_LOWER     7
 42 #define NUM_BOOT_ENTRY          8
 43 #define SIZE_BOOT_ENTRY         (NUM_BOOT_ENTRY * sizeof(u32))
 44 
 45 static int __init
 46 smp_85xx_kick_cpu(int nr)
 47 {
 48         unsigned long flags;
 49         const u64 *cpu_rel_addr;
 50         __iomem u32 *bptr_vaddr;
 51         struct device_node *np;
 52         int n = 0, hw_cpu = get_hard_smp_processor_id(nr);
 53         int ioremappable;
 54 
 55         WARN_ON(nr < 0 || nr >= NR_CPUS);
 56         WARN_ON(hw_cpu < 0 || hw_cpu >= NR_CPUS);
 57 
 58         pr_debug("smp_85xx_kick_cpu: kick CPU #%d\n", nr);
 59 
 60         np = of_get_cpu_node(nr, NULL);
 61         cpu_rel_addr = of_get_property(np, "cpu-release-addr", NULL);
 62 
 63         if (cpu_rel_addr == NULL) {
 64                 printk(KERN_ERR "No cpu-release-addr for cpu %d\n", nr);
 65                 return -ENOENT;
 66         }
 67 
 68         /*
 69          * A secondary core could be in a spinloop in the bootpage
 70          * (0xfffff000), somewhere in highmem, or somewhere in lowmem.
 71          * The bootpage and highmem can be accessed via ioremap(), but
 72          * we need to directly access the spinloop if its in lowmem.
 73          */
 74         ioremappable = *cpu_rel_addr > virt_to_phys(high_memory);
 75 
 76         /* Map the spin table */
 77         if (ioremappable)
 78                 bptr_vaddr = ioremap(*cpu_rel_addr, SIZE_BOOT_ENTRY);
 79         else
 80                 bptr_vaddr = phys_to_virt(*cpu_rel_addr);
 81 
 82         local_irq_save(flags);
 83 
 84         out_be32(bptr_vaddr + BOOT_ENTRY_PIR, hw_cpu);
 85 #ifdef CONFIG_PPC32
 86         out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start));
 87 
 88         if (!ioremappable)
 89                 flush_dcache_range((ulong)bptr_vaddr,
 90                                 (ulong)(bptr_vaddr + SIZE_BOOT_ENTRY));
 91 
 92         /* Wait a bit for the CPU to ack. */
 93         while ((__secondary_hold_acknowledge != hw_cpu) && (++n < 1000))
 94                 mdelay(1);
 95 #else
 96         smp_generic_kick_cpu(nr);
 97 
 98         out_be64((u64 *)(bptr_vaddr + BOOT_ENTRY_ADDR_UPPER),
 99                 __pa((u64)*((unsigned long long *) generic_secondary_smp_init)));
100 
101         if (!ioremappable)
102                 flush_dcache_range((ulong)bptr_vaddr,
103                                 (ulong)(bptr_vaddr + SIZE_BOOT_ENTRY));
104 #endif
105 
106         local_irq_restore(flags);
107 
108         if (ioremappable)
109                 iounmap(bptr_vaddr);
110 
111         pr_debug("waited %d msecs for CPU #%d.\n", n, nr);
112 
113         return 0;
114 }
115 
116 struct smp_ops_t smp_85xx_ops = {
117         .kick_cpu = smp_85xx_kick_cpu,
118 #ifdef CONFIG_KEXEC
119         .give_timebase  = smp_generic_give_timebase,
120         .take_timebase  = smp_generic_take_timebase,
121 #endif
122 };
123 
124 #ifdef CONFIG_KEXEC
125 atomic_t kexec_down_cpus = ATOMIC_INIT(0);
126 
127 void mpc85xx_smp_kexec_cpu_down(int crash_shutdown, int secondary)
128 {
129         local_irq_disable();
130 
131         if (secondary) {
132                 atomic_inc(&kexec_down_cpus);
133                 /* loop forever */
134                 while (1);
135         }
136 }
137 
138 static void mpc85xx_smp_kexec_down(void *arg)
139 {
140         if (ppc_md.kexec_cpu_down)
141                 ppc_md.kexec_cpu_down(0,1);
142 }
143 
144 static void map_and_flush(unsigned long paddr)
145 {
146         struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
147         unsigned long kaddr  = (unsigned long)kmap(page);
148 
149         flush_dcache_range(kaddr, kaddr + PAGE_SIZE);
150         kunmap(page);
151 }
152 
153 /**
154  * Before we reset the other cores, we need to flush relevant cache
155  * out to memory so we don't get anything corrupted, some of these flushes
156  * are performed out of an overabundance of caution as interrupts are not
157  * disabled yet and we can switch cores
158  */
159 static void mpc85xx_smp_flush_dcache_kexec(struct kimage *image)
160 {
161         kimage_entry_t *ptr, entry;
162         unsigned long paddr;
163         int i;
164 
165         if (image->type == KEXEC_TYPE_DEFAULT) {
166                 /* normal kexec images are stored in temporary pages */
167                 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
168                      ptr = (entry & IND_INDIRECTION) ?
169                                 phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
170                         if (!(entry & IND_DESTINATION)) {
171                                 map_and_flush(entry);
172                         }
173                 }
174                 /* flush out last IND_DONE page */
175                 map_and_flush(entry);
176         } else {
177                 /* crash type kexec images are copied to the crash region */
178                 for (i = 0; i < image->nr_segments; i++) {
179                         struct kexec_segment *seg = &image->segment[i];
180                         for (paddr = seg->mem; paddr < seg->mem + seg->memsz;
181                              paddr += PAGE_SIZE) {
182                                 map_and_flush(paddr);
183                         }
184                 }
185         }
186 
187         /* also flush the kimage struct to be passed in as well */
188         flush_dcache_range((unsigned long)image,
189                            (unsigned long)image + sizeof(*image));
190 }
191 
192 static void mpc85xx_smp_machine_kexec(struct kimage *image)
193 {
194         int timeout = INT_MAX;
195         int i, num_cpus = num_present_cpus();
196 
197         mpc85xx_smp_flush_dcache_kexec(image);
198 
199         if (image->type == KEXEC_TYPE_DEFAULT)
200                 smp_call_function(mpc85xx_smp_kexec_down, NULL, 0);
201 
202         while ( (atomic_read(&kexec_down_cpus) != (num_cpus - 1)) &&
203                 ( timeout > 0 ) )
204         {
205                 timeout--;
206         }
207 
208         if ( !timeout )
209                 printk(KERN_ERR "Unable to bring down secondary cpu(s)");
210 
211         for_each_online_cpu(i)
212         {
213                 if ( i == smp_processor_id() ) continue;
214                 mpic_reset_core(i);
215         }
216 
217         default_machine_kexec(image);
218 }
219 #endif /* CONFIG_KEXEC */
220 
221 static void __init
222 smp_85xx_setup_cpu(int cpu_nr)
223 {
224         if (smp_85xx_ops.probe == smp_mpic_probe)
225                 mpic_setup_this_cpu();
226 
227         if (cpu_has_feature(CPU_FTR_DBELL))
228                 doorbell_setup_this_cpu();
229 }
230 
231 void __init mpc85xx_smp_init(void)
232 {
233         struct device_node *np;
234 
235         smp_85xx_ops.setup_cpu = smp_85xx_setup_cpu;
236 
237         np = of_find_node_by_type(NULL, "open-pic");
238         if (np) {
239                 smp_85xx_ops.probe = smp_mpic_probe;
240                 smp_85xx_ops.message_pass = smp_mpic_message_pass;
241         }
242 
243         if (cpu_has_feature(CPU_FTR_DBELL)) {
244                 /*
245                  * If left NULL, .message_pass defaults to
246                  * smp_muxed_ipi_message_pass
247                  */
248                 smp_85xx_ops.message_pass = NULL;
249                 smp_85xx_ops.cause_ipi = doorbell_cause_ipi;
250         }
251 
252         smp_ops = &smp_85xx_ops;
253 
254 #ifdef CONFIG_KEXEC
255         ppc_md.kexec_cpu_down = mpc85xx_smp_kexec_cpu_down;
256         ppc_md.machine_kexec = mpc85xx_smp_machine_kexec;
257 #endif
258 }
259 

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