cpu/x86: Support CPUs without rdmsr/wrmsr instructions

Quark does not support the rdmsr and wrmsr instructions.  In this case
use a SOC specific routine to support the setting of the MTRRs.  Migrate
the code from FSP 1.1 to be x86 CPU common.

Since all rdmsr/wrmsr accesses are being converted, fix the build
failure for quark in lib/reg_script.c.  Move the soc_msr_x routines and
their depencies from romstage/mtrr.c to reg_access.c.

TEST=Build and run on Galileo Gen2

Change-Id: Ibc68e696d8066fbe2322f446d8c983d3f86052ea
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15839
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 88 insertions, 0 deletions

diff --git a/src/soc/intel/quark/reg_access.c b/src/soc/intel/quark/reg_access.c
index 25a52ff7627c..4f14173586af 100644
--- a/src/soc/intel/quark/reg_access.c
+++ b/src/soc/intel/quark/reg_access.c
@@ -15,6 +15,7 @@
 
 #define __SIMPLE_DEVICE__
 
+#include <cpu/x86/mtrr.h>
 #include <console/console.h>
 #include <soc/pci_devs.h>
 #include <soc/ramstage.h>
@@ -71,6 +72,33 @@ static uint16_t get_legacy_gpio_address(uint32_t reg_address)
 	return (uint16_t)(gpio_base_address + reg_address);
 }
 
+static uint32_t mtrr_index_to_host_bridge_register_offset(unsigned long index)
+{
+	uint32_t offset;
+
+	/* Convert from MTRR index to host brigde offset (Datasheet 12.7.2) */
+	if (index == MTRR_CAP_MSR)
+		offset = QUARK_NC_HOST_BRIDGE_IA32_MTRR_CAP;
+	else if (index == MTRR_DEF_TYPE_MSR)
+		offset = QUARK_NC_HOST_BRIDGE_IA32_MTRR_DEF_TYPE;
+	else if (index == MTRR_FIX_64K_00000)
+		offset = QUARK_NC_HOST_BRIDGE_MTRR_FIX64K_00000;
+	else if ((index >= MTRR_FIX_16K_80000) && (index <= MTRR_FIX_16K_A0000))
+		offset = ((index - MTRR_FIX_16K_80000) << 1)
+			+ QUARK_NC_HOST_BRIDGE_MTRR_FIX16K_80000;
+	else if ((index >= MTRR_FIX_4K_C0000) && (index <= MTRR_FIX_4K_F8000))
+		offset = ((index - MTRR_FIX_4K_C0000) << 1)
+			+ QUARK_NC_HOST_BRIDGE_IA32_MTRR_PHYSBASE0;
+	else if ((index >= MTRR_PHYS_BASE(0)) && (index <= MTRR_PHYS_MASK(7)))
+		offset = (index - MTRR_PHYS_BASE(0))
+			+ QUARK_NC_HOST_BRIDGE_IA32_MTRR_PHYSBASE0;
+	else {
+		printk(BIOS_DEBUG, "index: 0x%08lx\n", index);
+		die("Invalid MTRR index specified!\n");
+	}
+	return offset;
+}
+
 void mcr_write(uint8_t opcode, uint8_t port, uint32_t reg_address)
 {
 	pci_write_config32(MC_BDF, QNC_ACCESS_PORT_MCR,
@@ -96,6 +124,22 @@ void mea_write(uint32_t reg_address)
 		& QNC_MEA_MASK);
 }
 
+uint32_t port_reg_read(uint8_t port, uint32_t offset)
+{
+	/* Read the port register */
+	mea_write(offset);
+	mcr_write(QUARK_OPCODE_READ, port, offset);
+	return mdr_read();
+}
+
+void port_reg_write(uint8_t port, uint32_t offset, uint32_t value)
+{
+	/* Write the port register */
+	mea_write(offset);
+	mdr_write(value);
+	mcr_write(QUARK_OPCODE_WRITE, port, offset);
+}
+
 static uint32_t reg_gpe0_read(uint32_t reg_address)
 {
 	/* Read the GPE0 register */
@@ -348,6 +392,50 @@ static void reg_write(struct reg_script_context *ctx)
 	}
 }
 
+msr_t soc_msr_read(unsigned index)
+{
+	uint32_t offset;
+	union {
+		uint64_t u64;
+		msr_t msr;
+	} value;
+
+	/* Read the low 32-bits of the register */
+	offset = mtrr_index_to_host_bridge_register_offset(index);
+	value.u64 = port_reg_read(QUARK_NC_HOST_BRIDGE_SB_PORT_ID, offset);
+
+	/* For 64-bit registers, read the upper 32-bits */
+	if ((offset >=  QUARK_NC_HOST_BRIDGE_MTRR_FIX64K_00000)
+		&& (offset <= QUARK_NC_HOST_BRIDGE_MTRR_FIX4K_F8000)) {
+		offset += 1;
+		value.u64 |= port_reg_read(QUARK_NC_HOST_BRIDGE_SB_PORT_ID,
+					   offset);
+	}
+	return value.msr;
+}
+
+void soc_msr_write(unsigned index, msr_t msr)
+{
+	uint32_t offset;
+	union {
+		uint32_t u32[2];
+		msr_t msr;
+	} value;
+
+	/* Write the low 32-bits of the register */
+	value.msr = msr;
+	offset = mtrr_index_to_host_bridge_register_offset(index);
+	port_reg_write(QUARK_NC_HOST_BRIDGE_SB_PORT_ID, offset, value.u32[0]);
+
+	/* For 64-bit registers, write the upper 32-bits */
+	if ((offset >=  QUARK_NC_HOST_BRIDGE_MTRR_FIX64K_00000)
+		&& (offset <= QUARK_NC_HOST_BRIDGE_MTRR_FIX4K_F8000)) {
+		offset += 1;
+		port_reg_write(QUARK_NC_HOST_BRIDGE_SB_PORT_ID, offset,
+				value.u32[1]);
+	}
+}
+
 const struct reg_script_bus_entry soc_reg_script_bus_table = {
 	SOC_TYPE, reg_read, reg_write
 };