x86: ivybridge: Add LAPIC support

The local advanced programmable interrupt controller is not used much in
U-Boot but we do need to set it up. Add basic support for this, which will
be extended as needed.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/x86/cpu/ivybridge/cpu.c

@@ -16,6 +16,7 @@
 #include <fdtdec.h>
 #include <asm/cpu.h>
 #include <asm/io.h>
+#include <asm/lapic.h>
 #include <asm/msr.h>
 #include <asm/mtrr.h>
 #include <asm/pci.h>
@@ -283,6 +284,8 @@ int print_cpuinfo(void)
 	if (ret)
 		return ret;
 
+	enable_lapic();
+
 	ret = microcode_update_intel();
 	if (ret && ret != -ENOENT && ret != -EEXIST)
 		return ret;

arch/x86/include/asm/lapic.h

@@ -0,0 +1,59 @@
+/*
+ * From Coreboot file of same name
+ *
+ * Copyright (C) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#ifndef _ARCH_ASM_LAPIC_H
+#define _ARCH_ASM_LAPIC_H
+
+#include <asm/io.h>
+#include <asm/lapic_def.h>
+#include <asm/msr.h>
+#include <asm/processor.h>
+
+static inline __attribute__((always_inline))
+		unsigned long lapic_read(unsigned long reg)
+{
+	return readl(LAPIC_DEFAULT_BASE + reg);
+}
+
+static inline __attribute__((always_inline))
+		void lapic_write(unsigned long reg, unsigned long val)
+{
+	writel(val, LAPIC_DEFAULT_BASE + reg);
+}
+
+static inline __attribute__((always_inline)) void lapic_wait_icr_idle(void)
+{
+	do { } while (lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY);
+}
+
+static inline void enable_lapic(void)
+{
+	msr_t msr;
+
+	msr = msr_read(LAPIC_BASE_MSR);
+	msr.hi &= 0xffffff00;
+	msr.lo &= 0x000007ff;
+	msr.lo |= LAPIC_DEFAULT_BASE | (1 << 11);
+	msr_write(LAPIC_BASE_MSR, msr);
+}
+
+static inline void disable_lapic(void)
+{
+	msr_t msr;
+
+	msr = msr_read(LAPIC_BASE_MSR);
+	msr.lo &= ~(1 << 11);
+	msr_write(LAPIC_BASE_MSR, msr);
+}
+
+static inline __attribute__((always_inline)) unsigned long lapicid(void)
+{
+	return lapic_read(LAPIC_ID) >> 24;
+}
+
+#endif

arch/x86/include/asm/lapic_def.h

@@ -0,0 +1,101 @@
+/*
+ * Taken from the Coreboot file of the same name
+ *
+ * (C) Copyright 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#ifndef _ASM_LAPIC_DEF_H
+#define _ASM_LAPIC_DEF_H
+
+#define LAPIC_BASE_MSR			0x1B
+#define LAPIC_BASE_MSR_BOOTSTRAP_PROCESSOR	(1 << 8)
+#define LAPIC_BASE_MSR_ENABLE		(1 << 11)
+#define LAPIC_BASE_MSR_ADDR_MASK	0xFFFFF000
+
+#define LOCAL_APIC_ADDR			0xfee00000
+#define LAPIC_DEFAULT_BASE		LOCAL_APIC_ADDR
+
+#define LAPIC_ID			0x020
+#define LAPIC_LVR			0x030
+#define LAPIC_TASKPRI			0x80
+#define LAPIC_TPRI_MASK			0xFF
+#define LAPIC_ARBID			0x090
+#define LAPIC_RRR			0x0C0
+#define LAPIC_SVR			0x0f0
+#define LAPIC_SPIV			0x0f0
+#define LAPIC_SPIV_ENABLE		0x100
+#define LAPIC_ESR			0x280
+#define LAPIC_ESR_SEND_CS		0x00001
+#define LAPIC_ESR_RECV_CS		0x00002
+#define LAPIC_ESR_SEND_ACC		0x00004
+#define LAPIC_ESR_RECV_ACC		0x00008
+#define LAPIC_ESR_SENDILL		0x00020
+#define LAPIC_ESR_RECVILL		0x00040
+#define LAPIC_ESR_ILLREGA		0x00080
+#define LAPIC_ICR			0x300
+#define LAPIC_DEST_SELF			0x40000
+#define LAPIC_DEST_ALLINC		0x80000
+#define LAPIC_DEST_ALLBUT		0xC0000
+#define LAPIC_ICR_RR_MASK		0x30000
+#define LAPIC_ICR_RR_INVALID		0x00000
+#define LAPIC_ICR_RR_INPROG		0x10000
+#define LAPIC_ICR_RR_VALID		0x20000
+#define LAPIC_INT_LEVELTRIG		0x08000
+#define LAPIC_INT_ASSERT		0x04000
+#define LAPIC_ICR_BUSY			0x01000
+#define LAPIC_DEST_LOGICAL		0x00800
+#define LAPIC_DM_FIXED			0x00000
+#define LAPIC_DM_LOWEST			0x00100
+#define LAPIC_DM_SMI			0x00200
+#define LAPIC_DM_REMRD			0x00300
+#define LAPIC_DM_NMI			0x00400
+#define LAPIC_DM_INIT			0x00500
+#define LAPIC_DM_STARTUP		0x00600
+#define LAPIC_DM_EXTINT			0x00700
+#define LAPIC_VECTOR_MASK		0x000FF
+#define LAPIC_ICR2			0x310
+#define GET_LAPIC_DEST_FIELD(x)		(((x) >> 24) & 0xFF)
+#define SET_LAPIC_DEST_FIELD(x)		((x) << 24)
+#define LAPIC_LVTT			0x320
+#define LAPIC_LVTPC			0x340
+#define LAPIC_LVT0			0x350
+#define LAPIC_LVT_TIMER_BASE_MASK	(0x3 << 18)
+#define GET_LAPIC_TIMER_BASE(x)		(((x) >> 18) & 0x3)
+#define SET_LAPIC_TIMER_BASE(x)		(((x) << 18))
+#define LAPIC_TIMER_BASE_CLKIN		0x0
+#define LAPIC_TIMER_BASE_TMBASE		0x1
+#define LAPIC_TIMER_BASE_DIV		0x2
+#define LAPIC_LVT_TIMER_PERIODIC	(1 << 17)
+#define LAPIC_LVT_MASKED		(1 << 16)
+#define LAPIC_LVT_LEVEL_TRIGGER		(1 << 15)
+#define LAPIC_LVT_REMOTE_IRR		(1 << 14)
+#define LAPIC_INPUT_POLARITY		(1 << 13)
+#define LAPIC_SEND_PENDING		(1 << 12)
+#define LAPIC_LVT_RESERVED_1		(1 << 11)
+#define LAPIC_DELIVERY_MODE_MASK	(7 << 8)
+#define LAPIC_DELIVERY_MODE_FIXED	(0 << 8)
+#define LAPIC_DELIVERY_MODE_NMI		(4 << 8)
+#define LAPIC_DELIVERY_MODE_EXTINT	(7 << 8)
+#define GET_LAPIC_DELIVERY_MODE(x)	(((x) >> 8) & 0x7)
+#define SET_LAPIC_DELIVERY_MODE(x, y)	(((x) & ~0x700)|((y) << 8))
+#define LAPIC_MODE_FIXED		0x0
+#define LAPIC_MODE_NMI			0x4
+#define LAPIC_MODE_EXINT		0x7
+#define LAPIC_LVT1			0x360
+#define LAPIC_LVTERR			0x370
+#define LAPIC_TMICT			0x380
+#define LAPIC_TMCCT			0x390
+#define LAPIC_TDCR			0x3E0
+#define LAPIC_TDR_DIV_TMBASE		(1 << 2)
+#define LAPIC_TDR_DIV_1			0xB
+#define LAPIC_TDR_DIV_2			0x0
+#define LAPIC_TDR_DIV_4			0x1
+#define LAPIC_TDR_DIV_8			0x2
+#define LAPIC_TDR_DIV_16		0x3
+#define LAPIC_TDR_DIV_32		0x8
+#define LAPIC_TDR_DIV_64		0x9
+#define LAPIC_TDR_DIV_128		0xA
+
+#endif