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