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authorThomas Bogendoerfer <tsbogend@alpha.franken.de>2008-03-18 22:47:56 +0100
committerRalf Baechle <ralf@linux-mips.org>2008-07-15 18:44:32 +0100
commit7a2852e49fe2d19296812c0f0f833b0ee3043bbb (patch)
treeecee76f7532b5478109d4ee38b7da93522c3084c
parentc3dd3de789630b9b1ac8f5175f1c21bbf1cca939 (diff)
downloadop-kernel-dev-7a2852e49fe2d19296812c0f0f833b0ee3043bbb.zip
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[MIPS] IP28: switch to "normal" mode after PROM no longer needed
SGI-IP28 is running in so called slow mode, when kernel is started from the PROM. PROM calls must be done in slow mode otherwise the PROM will issue an error. To get better memory performance we now switch to normal mode, when the PROM is no longer needed. Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/sgi-ip22/ip22-mc.c26
-rw-r--r--include/asm-mips/barrier.h14
2 files changed, 40 insertions, 0 deletions
diff --git a/arch/mips/sgi-ip22/ip22-mc.c b/arch/mips/sgi-ip22/ip22-mc.c
index 3f35d63..5268ac1 100644
--- a/arch/mips/sgi-ip22/ip22-mc.c
+++ b/arch/mips/sgi-ip22/ip22-mc.c
@@ -208,4 +208,30 @@ void __init sgimc_init(void)
void __init prom_meminit(void) {}
void __init prom_free_prom_memory(void)
{
+#ifdef CONFIG_SGI_IP28
+ u32 mconfig1;
+ unsigned long flags;
+ spinlock_t lock;
+
+ /*
+ * because ARCS accesses memory uncached we wait until ARCS
+ * isn't needed any longer, before we switch from slow to
+ * normal mode
+ */
+ spin_lock_irqsave(&lock, flags);
+ mconfig1 = sgimc->mconfig1;
+ /* map ECC register */
+ sgimc->mconfig1 = (mconfig1 & 0xffff0000) | 0x2060;
+ iob();
+ /* switch to normal mode */
+ *(unsigned long *)PHYS_TO_XKSEG_UNCACHED(0x60000000) = 0;
+ iob();
+ /* reduce WR_COL */
+ sgimc->cmacc = (sgimc->cmacc & ~0xf) | 4;
+ iob();
+ /* restore old config */
+ sgimc->mconfig1 = mconfig1;
+ iob();
+ spin_unlock_irqrestore(&lock, flags);
+#endif
}
diff --git a/include/asm-mips/barrier.h b/include/asm-mips/barrier.h
index 9d8cfbb..8e9ac31 100644
--- a/include/asm-mips/barrier.h
+++ b/include/asm-mips/barrier.h
@@ -92,11 +92,25 @@
#define fast_wmb() __sync()
#define fast_rmb() __sync()
#define fast_mb() __sync()
+#ifdef CONFIG_SGI_IP28
+#define fast_iob() \
+ __asm__ __volatile__( \
+ ".set push\n\t" \
+ ".set noreorder\n\t" \
+ "lw $0,%0\n\t" \
+ "sync\n\t" \
+ "lw $0,%0\n\t" \
+ ".set pop" \
+ : /* no output */ \
+ : "m" (*(int *)CKSEG1ADDR(0x1fa00004)) \
+ : "memory")
+#else
#define fast_iob() \
do { \
__sync(); \
__fast_iob(); \
} while (0)
+#endif
#ifdef CONFIG_CPU_HAS_WB
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