- Better memory I/O space distinguishing in amd_mtrr.c

  This is way to much code duplication but for now things work.
- Fix the typo in amd8111_lpc.c
- Remove an unused macro, use continue instead of break in mtrr.c


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1704 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 89 insertions, 4 deletions

diff --git a/src/cpu/amd/mtrr/amd_mtrr.c b/src/cpu/amd/mtrr/amd_mtrr.c
index ab6bc2bbee..0247fd00d3 100644
--- a/src/cpu/amd/mtrr/amd_mtrr.c
+++ b/src/cpu/amd/mtrr/amd_mtrr.c
@@ -17,6 +17,66 @@ static unsigned long resk(uint64_t value)
 	return resultk;
 }
 
+#if 1
+static unsigned fixed_mtrr_index(unsigned long addrk)
+{
+	unsigned index;
+	index = (addrk - 0) >> 6;
+	if (index >= 8) {
+		index = ((addrk - 8*64) >> 4) + 8;
+	}
+	if (index >= 24) {
+		index = ((addrk - (8*64 + 16*16)) >> 2) + 24;
+	}
+	if (index > NUM_FIXED_RANGES) {
+		index = NUM_FIXED_RANGES;
+	}
+	return index;
+}
+
+
+static unsigned int mtrr_msr[] = {
+	MTRRfix64K_00000_MSR, MTRRfix16K_80000_MSR, MTRRfix16K_A0000_MSR,
+	MTRRfix4K_C0000_MSR, MTRRfix4K_C8000_MSR, MTRRfix4K_D0000_MSR, MTRRfix4K_D8000_MSR,
+	MTRRfix4K_E0000_MSR, MTRRfix4K_E8000_MSR, MTRRfix4K_F0000_MSR, MTRRfix4K_F8000_MSR,
+};
+
+static void set_fixed_mtrrs(unsigned int first, unsigned int last, unsigned char type)
+{
+	unsigned int i;
+	unsigned int fixed_msr = NUM_FIXED_RANGES >> 3;
+	msr_t msr;
+	msr.lo = msr.hi = 0; /* Shut up gcc */
+	for (i = first; i < last; i++) {
+		/* When I switch to a new msr read it in */
+		if (fixed_msr != i >> 3) {
+			/* But first write out the old msr */
+			if (fixed_msr < (NUM_FIXED_RANGES >> 3)) {
+				disable_cache();
+				wrmsr(mtrr_msr[fixed_msr], msr);
+				enable_cache();
+			}
+			fixed_msr = i>>3;
+			msr = rdmsr(mtrr_msr[fixed_msr]);
+		}
+		if ((i & 7) < 4) {
+			msr.lo &= ~(0xff << ((i&3)*8));
+			msr.lo |= type << ((i&3)*8);
+		} else {
+			msr.hi &= ~(0xff << ((i&3)*8));
+			msr.hi |= type << ((i&3)*8);
+		}
+	}
+	/* Write out the final msr */
+	if (fixed_msr < (NUM_FIXED_RANGES >> 3)) {
+		disable_cache();
+		wrmsr(mtrr_msr[fixed_msr], msr);
+		enable_cache();
+	}
+}
+
+#endif
+
 void amd_setup_mtrrs(void)
 {
 	unsigned long mmio_basek, tomk;
@@ -24,12 +84,16 @@ void amd_setup_mtrrs(void)
 	device_t dev;
 	msr_t msr;
 
-	/* Disable the access to AMD RdDram and WrDram extension bits */
+	/* Enable the access to AMD RdDram and WrDram extension bits */
 	msr = rdmsr(SYSCFG_MSR);
-	msr.lo &= ~SYSCFG_MSR_MtrrFixDramModEn;
+	msr.lo |= SYSCFG_MSR_MtrrFixDramModEn;
 	wrmsr(SYSCFG_MSR, msr);
 
-	x86_setup_mtrrs();
+	printk_debug("\n");
+	/* Initialized the fixed_mtrrs to uncached */
+	printk_debug("Setting fixed MTRRs(%d-%d) type: UC\n", 
+		0, NUM_FIXED_RANGES);
+	set_fixed_mtrrs(0, NUM_FIXED_RANGES, MTRR_TYPE_UNCACHEABLE);
 
 	/* Except for the PCI MMIO hole just before 4GB there are no
 	 * significant holes in the address space, so just account
@@ -41,6 +105,7 @@ void amd_setup_mtrrs(void)
 		last = &dev->resource[dev->resources];
 		for(res = &dev->resource[0]; res < last; res++) {
 			unsigned long topk;
+			unsigned long start_mtrr, last_mtrr;
 			if (!(res->flags & IORESOURCE_MEM) ||
 				(!(res->flags & IORESOURCE_CACHEABLE))) {
 				continue;
@@ -52,8 +117,18 @@ void amd_setup_mtrrs(void)
 			if ((topk < 4*1024*1024) && (mmio_basek < topk)) {
 				mmio_basek = topk;
 			}
+
+			start_mtrr = fixed_mtrr_index(resk(res->base));
+			last_mtrr  = fixed_mtrr_index(resk(res->base + res->size));
+			if (start_mtrr >= NUM_FIXED_RANGES) {
+				continue;
+			}
+			printk_debug("Setting fixed MTRRs(%d-%d) Type: WB\n",
+				start_mtrr, last_mtrr);
+			set_fixed_mtrrs(start_mtrr, last_mtrr, MTRR_TYPE_WRBACK | MTRR_READ_MEM | MTRR_WRITE_MEM);
 		}
 	}
+	printk_debug("DONE fixed MTRRs\n");
 	if (mmio_basek > tomk) {
 		mmio_basek = tomk;
 	}
@@ -82,9 +157,19 @@ void amd_setup_mtrrs(void)
 		wrmsr(i, msr);
 	}
 
+	/* Enable Variable Mtrrs 
+	 * Enable the RdMem and WrMem bits in the fixed mtrrs.
+	 * Disable access to the RdMem and WrMem in the fixed mtrr.
+	 */
 	msr = rdmsr(SYSCFG_MSR);
-	msr.lo |= SYSCFG_MSR_MtrrVarDramEn | SYSCFG_MSR_TOM2En;
+	msr.lo |= SYSCFG_MSR_MtrrVarDramEn | SYSCFG_MSR_MtrrFixDramEn | SYSCFG_MSR_TOM2En;
+	msr.lo &= ~SYSCFG_MSR_MtrrFixDramModEn;
 	wrmsr(SYSCFG_MSR, msr);
 
 	enable_cache();
+
+	/* Now that I have mapped what is memory and what is not
+	 * Setup the mtrrs so we can cache the memory.
+	 */
+	x86_setup_mtrrs();
 }