Merge of rsync://rsync.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
diff --git a/arch/sparc64/kernel/setup.c b/arch/sparc64/kernel/setup.c
index 12c3d84b..b7e6a91 100644
--- a/arch/sparc64/kernel/setup.c
+++ b/arch/sparc64/kernel/setup.c
@@ -383,6 +383,17 @@
/* Use PROM debug console. */
register_console(&prom_debug_console);
break;
+ case 'P':
+ /* Force UltraSPARC-III P-Cache on. */
+ if (tlb_type != cheetah) {
+ printk("BOOT: Ignoring P-Cache force option.\n");
+ break;
+ }
+ cheetah_pcache_forced_on = 1;
+ add_taint(TAINT_MACHINE_CHECK);
+ cheetah_enable_pcache();
+ break;
+
default:
printk("Unknown boot switch (-%c)\n", c);
break;
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 6dff06a..e5b9c7a 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -123,6 +123,9 @@
smp_setup_percpu_timer();
+ if (cheetah_pcache_forced_on)
+ cheetah_enable_pcache();
+
local_irq_enable();
calibrate_delay();
diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index 56b203a..a9f4596 100644
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -421,6 +421,25 @@
}
}
+int cheetah_pcache_forced_on;
+
+void cheetah_enable_pcache(void)
+{
+ unsigned long dcr;
+
+ printk("CHEETAH: Enabling P-Cache on cpu %d.\n",
+ smp_processor_id());
+
+ __asm__ __volatile__("ldxa [%%g0] %1, %0"
+ : "=r" (dcr)
+ : "i" (ASI_DCU_CONTROL_REG));
+ dcr |= (DCU_PE | DCU_HPE | DCU_SPE | DCU_SL);
+ __asm__ __volatile__("stxa %0, [%%g0] %1\n\t"
+ "membar #Sync"
+ : /* no outputs */
+ : "r" (dcr), "i" (ASI_DCU_CONTROL_REG));
+}
+
/* Cheetah error trap handling. */
static unsigned long ecache_flush_physbase;
static unsigned long ecache_flush_linesize;
diff --git a/include/asm-sparc64/spitfire.h b/include/asm-sparc64/spitfire.h
index ad78ce6..9d7613e 100644
--- a/include/asm-sparc64/spitfire.h
+++ b/include/asm-sparc64/spitfire.h
@@ -48,6 +48,9 @@
extern enum ultra_tlb_layout tlb_type;
+extern int cheetah_pcache_forced_on;
+extern void cheetah_enable_pcache(void);
+
#define sparc64_highest_locked_tlbent() \
(tlb_type == spitfire ? \
SPITFIRE_HIGHEST_LOCKED_TLBENT : \