diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/sgi-ip22/ip22-mc.c | 26 |
1 files changed, 26 insertions, 0 deletions
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 } |