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Diffstat (limited to 'arch/powerpc/platforms/85xx/smp.c')
-rw-r--r--arch/powerpc/platforms/85xx/smp.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c
index 04160a4cc699..a15f582300d8 100644
--- a/arch/powerpc/platforms/85xx/smp.c
+++ b/arch/powerpc/platforms/85xx/smp.c
@@ -46,6 +46,7 @@ smp_85xx_kick_cpu(int nr)
46 __iomem u32 *bptr_vaddr; 46 __iomem u32 *bptr_vaddr;
47 struct device_node *np; 47 struct device_node *np;
48 int n = 0; 48 int n = 0;
49 int ioremappable;
49 50
50 WARN_ON (nr < 0 || nr >= NR_CPUS); 51 WARN_ON (nr < 0 || nr >= NR_CPUS);
51 52
@@ -59,21 +60,37 @@ smp_85xx_kick_cpu(int nr)
59 return; 60 return;
60 } 61 }
61 62
63 /*
64 * A secondary core could be in a spinloop in the bootpage
65 * (0xfffff000), somewhere in highmem, or somewhere in lowmem.
66 * The bootpage and highmem can be accessed via ioremap(), but
67 * we need to directly access the spinloop if its in lowmem.
68 */
69 ioremappable = *cpu_rel_addr > virt_to_phys(high_memory);
70
62 /* Map the spin table */ 71 /* Map the spin table */
63 bptr_vaddr = ioremap(*cpu_rel_addr, SIZE_BOOT_ENTRY); 72 if (ioremappable)
73 bptr_vaddr = ioremap(*cpu_rel_addr, SIZE_BOOT_ENTRY);
74 else
75 bptr_vaddr = phys_to_virt(*cpu_rel_addr);
64 76
65 local_irq_save(flags); 77 local_irq_save(flags);
66 78
67 out_be32(bptr_vaddr + BOOT_ENTRY_PIR, nr); 79 out_be32(bptr_vaddr + BOOT_ENTRY_PIR, nr);
68 out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start)); 80 out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start));
69 81
82 if (!ioremappable)
83 flush_dcache_range((ulong)bptr_vaddr,
84 (ulong)(bptr_vaddr + SIZE_BOOT_ENTRY));
85
70 /* Wait a bit for the CPU to ack. */ 86 /* Wait a bit for the CPU to ack. */
71 while ((__secondary_hold_acknowledge != nr) && (++n < 1000)) 87 while ((__secondary_hold_acknowledge != nr) && (++n < 1000))
72 mdelay(1); 88 mdelay(1);
73 89
74 local_irq_restore(flags); 90 local_irq_restore(flags);
75 91
76 iounmap(bptr_vaddr); 92 if (ioremappable)
93 iounmap(bptr_vaddr);
77 94
78 pr_debug("waited %d msecs for CPU #%d.\n", n, nr); 95 pr_debug("waited %d msecs for CPU #%d.\n", n, nr);
79} 96}