soc/intel/quark: Support access to CPU CR registers

Add support to access CR0 and CR4.

TEST=Build and run on Galileo Gen2.

Change-Id: I8084b7824ae9fbcd55e11a7b5eec142591a7e279
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/16004
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

2 files changed, 61 insertions, 0 deletions

diff --git a/src/soc/intel/quark/include/soc/reg_access.h b/src/soc/intel/quark/include/soc/reg_access.h
index 0e64917177..8be7f83e88 100644
--- a/src/soc/intel/quark/include/soc/reg_access.h
+++ b/src/soc/intel/quark/include/soc/reg_access.h
@@ -19,6 +19,7 @@
 #define __SIMPLE_DEVICE__
 
 #include <arch/io.h>
+#include <cpu/x86/cr.h>
 #include <cpu/x86/msr.h>
 #include <cpu/x86/mtrr.h>
 #include <delay.h>
@@ -39,6 +40,7 @@ enum {
 	PCIE_RESET,
 	GPE0_REGS,
 	HOST_BRIDGE,
+	CPU_CR,
 };
 
 enum {
@@ -50,6 +52,27 @@ enum {
 	_REG_SCRIPT_ENCODE_RAW(REG_SCRIPT_COMMAND_##cmd_, SOC_TYPE,        \
 			       size_, reg_, mask_, value_, timeout_, reg_set_)
 
+/* CPU CRx register access macros */
+#define REG_CPU_CR_ACCESS(cmd_, reg_, mask_, value_, timeout_) \
+	SOC_ACCESS(cmd_, reg_, REG_SCRIPT_SIZE_32, mask_, value_, timeout_, \
+		CPU_CR)
+#define REG_CPU_CR_READ(reg_) \
+	REG_CPU_CR_ACCESS(READ, reg_, 0, 0, 0)
+#define REG_CPU_CR_WRITE(reg_, value_) \
+	REG_CPU_CR_ACCESS(WRITE, reg_, 0, value_, 0)
+#define REG_CPU_CR_AND(reg_, value_) \
+	REG_CPU_CR_RMW(reg_, value_, 0)
+#define REG_CPU_CR_RMW(reg_, mask_, value_) \
+	REG_CPU_CR_ACCESS(RMW, reg_, mask_, value_, 0)
+#define REG_CPU_CR_RXW(reg_, mask_, value_) \
+	REG_CPU_CR_ACCESS(RXW, reg_, mask_, value_, 0)
+#define REG_CPU_CR_OR(reg_, value_) \
+	REG_CPU_CR_RMW(reg_, 0xffffffff, value_)
+#define REG_CPU_CR_POLL(reg_, mask_, value_, timeout_) \
+	REG_CPU_CR_ACCESS(POLL, reg_, mask_, value_, timeout_)
+#define REG_CPU_CR_XOR(reg_, value_) \
+	REG_CPU_CR_RXW(reg_, 0xffffffff, value_)
+
 /* GPE0 controller register access macros */
 #define REG_GPE0_ACCESS(cmd_, reg_, mask_, value_, timeout_) \
 	SOC_ACCESS(cmd_, reg_, REG_SCRIPT_SIZE_32, mask_, value_, timeout_, \
diff --git a/src/soc/intel/quark/reg_access.c b/src/soc/intel/quark/reg_access.c
index 368417b694..e5c0f0b6dc 100644
--- a/src/soc/intel/quark/reg_access.c
+++ b/src/soc/intel/quark/reg_access.c
@@ -141,6 +141,34 @@ void port_reg_write(uint8_t port, uint32_t offset, uint32_t value)
 	mcr_write(QUARK_OPCODE_WRITE, port, offset);
 }
 
+static CRx_TYPE reg_cpu_cr_read(uint32_t reg_address)
+{
+	/* Read the CPU CRx register */
+	switch(reg_address) {
+	case 0:
+		return read_cr0();
+
+	case 4:
+		return read_cr4();
+	}
+	die("ERROR - Unsupported CPU register!\n");
+}
+
+static void reg_cpu_cr_write(uint32_t reg_address, CRx_TYPE value)
+{
+	/* Write the CPU CRx register */
+	switch(reg_address) {
+	default:
+		die("ERROR - Unsupported CPU register!\n");
+
+	case 0:
+		write_cr0(value);
+
+	case 4:
+		write_cr4(value);
+	}
+}
+
 static uint32_t reg_gpe0_read(uint32_t reg_address)
 {
 	/* Read the GPE0 register */
@@ -278,6 +306,11 @@ static uint64_t reg_read(struct reg_script_context *ctx)
 		ctx->display_features = REG_SCRIPT_DISPLAY_NOTHING;
 		return 0;
 
+	case CPU_CR:
+		ctx->display_prefix = "CPU CR";
+		value = reg_cpu_cr_read(step->reg);
+		break;
+
 	case GPE0_REGS:
 		ctx->display_prefix = "GPE0";
 		value = reg_gpe0_read(step->reg);
@@ -333,6 +366,11 @@ static void reg_write(struct reg_script_context *ctx)
 		ctx->display_features = REG_SCRIPT_DISPLAY_NOTHING;
 		return;
 
+	case CPU_CR:
+		ctx->display_prefix = "CPU CR";
+		reg_cpu_cr_write(step->reg, step->value);
+		break;
+
 	case GPE0_REGS:
 		ctx->display_prefix = "GPE0";
 		reg_gpe0_write(step->reg, (uint32_t)step->value);