From 5a1970959053143f6674f6d98c259452763a2f22 Mon Sep 17 00:00:00 2001 From: Andrew Sharp Date: Fri, 23 Mar 2007 12:15:18 -0700 Subject: [MIPS] 64-bit TO_PHYS_MASK macro for RM9000 processors Signed-off-by: Andrew Sharp Signed-off-by: Ralf Baechle --- include/asm-mips/addrspace.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include') diff --git a/include/asm-mips/addrspace.h b/include/asm-mips/addrspace.h index c6275088cf65..964c5eddc21b 100644 --- a/include/asm-mips/addrspace.h +++ b/include/asm-mips/addrspace.h @@ -133,6 +133,7 @@ || defined (CONFIG_CPU_R4X00) \ || defined (CONFIG_CPU_R5000) \ || defined (CONFIG_CPU_RM7000) \ + || defined (CONFIG_CPU_RM9000) \ || defined (CONFIG_CPU_NEVADA) \ || defined (CONFIG_CPU_TX49XX) \ || defined (CONFIG_CPU_MIPS64) -- cgit v1.2.3 From 075c733e19ce7530b53b78151cc4d303c8f64548 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Thu, 5 Jul 2007 08:14:21 +0100 Subject: [MIPS] RM7000: Enable ICACHE_REFILLS_WORKAROUND_WAR. The RM7000 processors and the E9000 cores have a bug (though PMC-Sierra opposes it being called that) where invalid instructions in the same I-cache line worth of instructions being fetched may case spurious exceptions. The workaround for this was only enabled for E9000 cores; enable it also for all RM7000-based platforms. Signed-off-by: Ralf Baechle --- include/asm-mips/war.h | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) (limited to 'include') diff --git a/include/asm-mips/war.h b/include/asm-mips/war.h index 13a3502eef44..ec0eeebd8802 100644 --- a/include/asm-mips/war.h +++ b/include/asm-mips/war.h @@ -177,18 +177,22 @@ #endif /* - * The RM9000 has a bug (though PMC-Sierra opposes it being called that) - * where invalid instructions in the same I-cache line worth of instructions - * being fetched may case spurious exceptions. - */ -#if defined(CONFIG_MOMENCO_JAGUAR_ATX) || defined(CONFIG_MOMENCO_OCELOT_3) || \ - defined(CONFIG_PMC_YOSEMITE) || defined(CONFIG_BASLER_EXCITE) + * The RM7000 processors and the E9000 cores have a bug (though PMC-Sierra + * opposes it being called that) where invalid instructions in the same + * I-cache line worth of instructions being fetched may case spurious + * exceptions. + */ +#if defined(CONFIG_BASLER_EXCITE) || defined(CONFIG_MOMENCO_JAGUAR_ATX) || \ + defined(CONFIG_MIPS_ATLAS) || defined(CONFIG_MIPS_MALTA) || \ + defined(CONFIG_MOMENCO_OCELOT) || defined(CONFIG_MOMENCO_OCELOT_3) || \ + defined(CONFIG_MOMENCO_OCELOT_C) || defined(CONFIG_PMC_YOSEMITE) || \ + defined(CONFIG_SGI_IP32) || defined(CONFIG_WR_PPMC) #define ICACHE_REFILLS_WORKAROUND_WAR 1 #endif /* - * ON the R10000 upto version 2.6 (not sure about 2.7) there is a bug that + * On the R10000 upto version 2.6 (not sure about 2.7) there is a bug that * may cause ll / sc and lld / scd sequences to execute non-atomically. */ #ifdef CONFIG_SGI_IP27 -- cgit v1.2.3 From fde97822a295da9dffa4af643b49a58ffc4516ad Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Fri, 6 Jul 2007 14:40:05 +0100 Subject: [MIPS] Add macros to encode processor revisions. Older processors used to encode processor version and revision in two 4-bit bitfields, the 4K seems to simply count up and even newer MTI cores have switched to use the 8-bits as 3:3:2 bitfield with the last field as the patch number. Signed-off-by: Ralf Baechle --- include/asm-mips/cpu.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include') diff --git a/include/asm-mips/cpu.h b/include/asm-mips/cpu.h index d38fdbf845b2..2924069075e0 100644 --- a/include/asm-mips/cpu.h +++ b/include/asm-mips/cpu.h @@ -124,6 +124,17 @@ #define PRID_REV_VR4181A 0x0070 /* Same as VR4122 */ #define PRID_REV_VR4130 0x0080 +/* + * Older processors used to encode processor version and revision in two + * 4-bit bitfields, the 4K seems to simply count up and even newer MTI cores + * have switched to use the 8-bits as 3:3:2 bitfield with the last field as + * the patch number. *ARGH* + */ +#define PRID_REV_ENCODE_44(ver, rev) \ + ((ver) << 4 | (rev)) +#define PRID_REV_ENCODE_332(ver, rev, patch) \ + ((ver) << 5 | (rev) << 2 | (patch)) + /* * FPU implementation/revision register (CP1 control register 0). * -- cgit v1.2.3 From 4b3e975e4a06f1710693c5aa51b8f98facfa9863 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Thu, 21 Jun 2007 00:22:34 +0100 Subject: [MIPS] Fix scheduling latency issue on 24K, 34K and 74K cores The idle loop goes to sleep using the WAIT instruction if !need_resched(). This has is suffering from from a race condition that if if just after need_resched has returned 0 an interrupt might set TIF_NEED_RESCHED but we've just completed the test so go to sleep anyway. This would be trivial to fix by just disabling interrupts during that sequence as in: local_irq_disable(); if (!need_resched()) __asm__("wait"); local_irq_enable(); but the processor architecture leaves it undefined if a processor calling WAIT with interrupts disabled will ever restart its pipeline and indeed some processors have made use of the freedom provided by the architecture definition. This has been resolved and the Config7.WII bit indicates that the use of WAIT is safe on 24K, 24KE and 34K cores. It also is safe on 74K starting revision 2.1.0 so enable the use of WAIT with interrupts disabled for 74K based on a c0_prid of at least that. Signed-off-by: Ralf Baechle --- arch/mips/kernel/cpu-probe.c | 15 +++++++++++++-- include/asm-mips/mipsregs.h | 2 ++ 2 files changed, 15 insertions(+), 2 deletions(-) (limited to 'include') diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index 0fc90ba16ae1..b12eeee0e974 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -137,13 +137,24 @@ static inline void check_wait(void) case CPU_4KEC: case CPU_4KSC: case CPU_5KC: - case CPU_24K: case CPU_25KF: + case CPU_PR4450: + cpu_wait = r4k_wait; + break; + + case CPU_24K: case CPU_34K: + cpu_wait = r4k_wait; + if (read_c0_config7() & MIPS_CONF7_WII) + cpu_wait = r4k_wait_irqoff; + break; + case CPU_74K: - case CPU_PR4450: cpu_wait = r4k_wait; + if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0)) + cpu_wait = r4k_wait_irqoff; break; + case CPU_TX49XX: cpu_wait = r4k_wait_irqoff; break; diff --git a/include/asm-mips/mipsregs.h b/include/asm-mips/mipsregs.h index 9985cb7c16e7..89c81922d47c 100644 --- a/include/asm-mips/mipsregs.h +++ b/include/asm-mips/mipsregs.h @@ -534,6 +534,8 @@ #define MIPS_CONF3_LPA (_ULCAST_(1) << 7) #define MIPS_CONF3_DSP (_ULCAST_(1) << 10) +#define MIPS_CONF7_WII (_ULCAST_(1) << 31) + /* * Bits in the MIPS32/64 coprocessor 1 (FPU) revision register. */ -- cgit v1.2.3