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authorThomas Bogendoerfer <tsbogend@alpha.franken.de>2008-03-18 17:47:56 -0400
committerRalf Baechle <ralf@linux-mips.org>2008-07-15 13:44:32 -0400
commit7a2852e49fe2d19296812c0f0f833b0ee3043bbb (patch)
treeecee76f7532b5478109d4ee38b7da93522c3084c /arch
parentc3dd3de789630b9b1ac8f5175f1c21bbf1cca939 (diff)
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/sgi-ip22/ip22-mc.c26
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 3f35d6367bec..5268ac187bbd 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)
208void __init prom_meminit(void) {} 208void __init prom_meminit(void) {}
209void __init prom_free_prom_memory(void) 209void __init prom_free_prom_memory(void)
210{ 210{
211#ifdef CONFIG_SGI_IP28
212 u32 mconfig1;
213 unsigned long flags;
214 spinlock_t lock;
215
216 /*
217 * because ARCS accesses memory uncached we wait until ARCS
218 * isn't needed any longer, before we switch from slow to
219 * normal mode
220 */
221 spin_lock_irqsave(&lock, flags);
222 mconfig1 = sgimc->mconfig1;
223 /* map ECC register */
224 sgimc->mconfig1 = (mconfig1 & 0xffff0000) | 0x2060;
225 iob();
226 /* switch to normal mode */
227 *(unsigned long *)PHYS_TO_XKSEG_UNCACHED(0x60000000) = 0;
228 iob();
229 /* reduce WR_COL */
230 sgimc->cmacc = (sgimc->cmacc & ~0xf) | 4;
231 iob();
232 /* restore old config */
233 sgimc->mconfig1 = mconfig1;
234 iob();
235 spin_unlock_irqrestore(&lock, flags);
236#endif
211} 237}