From 7a2852e49fe2d19296812c0f0f833b0ee3043bbb Mon Sep 17 00:00:00 2001 From: Thomas Bogendoerfer Date: Tue, 18 Mar 2008 22:47:56 +0100 Subject: [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 Signed-off-by: Ralf Baechle --- arch/mips/sgi-ip22/ip22-mc.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'arch/mips/sgi-ip22') diff --git a/arch/mips/sgi-ip22/ip22-mc.c b/arch/mips/sgi-ip22/ip22-mc.c index 3f35d6367be..5268ac187bb 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 } -- cgit v1.2.3