/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2007-2009 coresystems GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <string.h>
#include <cpu/cpu.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/lapic.h>
#include <cpu/intel/microcode.h>
#include <cpu/intel/hyperthreading.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/mtrr.h>
#include <usbdebug.h>

static const uint32_t microcode_updates[] = {
	#include "microcode-2963-M01106C2217.h"
	#include "microcode-2964-M04106C2218.h"
	#include "microcode-2965-M08106C2219.h"
	#include "microcode-3101-M04106CA107.h"
	#include "microcode-3104-M08106CA107.h"
	#include "microcode-3107-M10106CA107.h"

	/*  Dummy terminator  */
        0x0, 0x0, 0x0, 0x0,
        0x0, 0x0, 0x0, 0x0,
        0x0, 0x0, 0x0, 0x0,
        0x0, 0x0, 0x0, 0x0,
};

static inline void strcpy(char *dst, char *src)
{
	while (*src) *dst++ = *src++;
}

static void fill_processor_name(char *processor_name)
{
	struct cpuid_result regs;
	char temp_processor_name[49];
	char *processor_name_start;
	unsigned int *name_as_ints = (unsigned int *)temp_processor_name;
	int i;

	for (i=0; i<3; i++) {
		regs = cpuid(0x80000002 + i);
		name_as_ints[i*4 + 0] = regs.eax;
		name_as_ints[i*4 + 1] = regs.ebx;
		name_as_ints[i*4 + 2] = regs.ecx;
		name_as_ints[i*4 + 3] = regs.edx;
	}

	temp_processor_name[48] = 0;

	/* Skip leading spaces */
	processor_name_start = temp_processor_name;
	while (*processor_name_start == ' ')
		processor_name_start++;

	memset(processor_name, 0, 49);
	strcpy(processor_name, processor_name_start);
}

#define IA32_FEATURE_CONTROL 0x003a

#define CPUID_VMX (1 << 5)
#define CPUID_SMX (1 << 6)
static void enable_vmx(void)
{
	struct cpuid_result regs;
	msr_t msr;

	msr = rdmsr(IA32_FEATURE_CONTROL);

	if (msr.lo & (1 << 0)) {
		/* VMX locked. If we set it again we get an illegal
		 * instruction
		 */
		return;
	}

	regs = cpuid(1);
	if (regs.ecx & CPUID_VMX) {
		msr.lo |= (1 << 2);
		if (regs.ecx & CPUID_SMX)
			msr.lo |= (1 << 1);
	}

	wrmsr(IA32_FEATURE_CONTROL, msr);

	msr.lo |= (1 << 0); /* Set lock bit */

	wrmsr(IA32_FEATURE_CONTROL, msr);
}

#define PMG_CST_CONFIG_CONTROL	0xe2
#define PMG_IO_BASE_ADDR	0xe3
#define PMG_IO_CAPTURE_ADDR	0xe4
#define PMB0 0x510 /* analogous to P_BLK in cpu.asl */
#define PMB1 0x0	/* IO port that triggers SMI once cores are in the same state.
			See CSM Trigger, at PMG_CST_CONFIG_CONTROL[6:4] */
#define HIGHEST_CLEVEL		3
static void configure_c_states(void)
{
	msr_t msr;

	msr = rdmsr(PMG_CST_CONFIG_CONTROL);
	msr.lo |= (1 << 15); // Lock configuration
	msr.lo |= (1 << 10); // redirect IO-based CState transition requests to MWAIT
	msr.lo &= ~(1 << 9); // Issue a single stop grant cycle upon stpclk
	msr.lo &= ~7; msr.lo |= HIGHEST_CLEVEL; // support at most C3
	// TODO Do we want Deep C4 and  Dynamic L2 shrinking?
	wrmsr(PMG_CST_CONFIG_CONTROL, msr);

	// set P_BLK address
	msr = rdmsr(PMG_IO_BASE_ADDR);
	msr.lo = (PMB0 + 4) | (PMB1 << 16);
	wrmsr(PMG_IO_BASE_ADDR, msr);

	// set C_LVL controls
	msr = rdmsr(PMG_IO_CAPTURE_ADDR);
	msr.lo = (PMB0 + 4) | ((HIGHEST_CLEVEL - 2) << 16); // -2 because LVL0+1 aren't counted
	wrmsr(PMG_IO_CAPTURE_ADDR, msr);
}

#define IA32_MISC_ENABLE	0x1a0
static void configure_misc(void)
{
	msr_t msr;

	msr = rdmsr(IA32_MISC_ENABLE);
	msr.lo |= (1 << 3); 	/* TM1 enable */
	msr.lo |= (1 << 13);	/* TM2 enable */
	msr.lo |= (1 << 17);	/* Bidirectional PROCHOT# */

	msr.lo |= (1 << 10);	/* FERR# multiplexing */

	// TODO: Only if  IA32_PLATFORM_ID[17] = 0 and IA32_PLATFORM_ID[50] = 1
	msr.lo |= (1 << 16);	/* Enhanced SpeedStep Enable */

	// TODO Do we want Deep C4 and  Dynamic L2 shrinking?
	wrmsr(IA32_MISC_ENABLE, msr);

	msr.lo |= (1 << 20);	/* Lock Enhanced SpeedStep Enable */
	wrmsr(IA32_MISC_ENABLE, msr);
}

#if CONFIG_USBDEBUG
static unsigned ehci_debug_addr;
#endif

static void model_106cx_init(device_t cpu)
{
	char processor_name[49];

	/* Turn on caching if we haven't already */
	x86_enable_cache();

	/* Update the microcode */
	intel_update_microcode(microcode_updates);

	/* Print processor name */
	fill_processor_name(processor_name);
	printk(BIOS_INFO, "CPU: %s.\n", processor_name);

#if CONFIG_USBDEBUG
	// Is this caution really needed?
	if(!ehci_debug_addr)
		ehci_debug_addr = get_ehci_debug();
	set_ehci_debug(0);
#endif

	/* Setup MTRRs */
	x86_setup_mtrrs(32);
	x86_mtrr_check();

#if CONFIG_USBDEBUG
	set_ehci_debug(ehci_debug_addr);
#endif

	/* Enable the local cpu apics */
	setup_lapic();

	/* Enable virtualization */
	enable_vmx();

	/* Configure C States */
	configure_c_states();

	/* Configure Enhanced SpeedStep and Thermal Sensors */
	configure_misc();

	/* TODO: PIC thermal sensor control */

	/* Start up my cpu siblings */
	intel_sibling_init(cpu);
}

static struct device_operations cpu_dev_ops = {
	.init     = model_106cx_init,
};

static struct cpu_device_id cpu_table[] = {
	{ X86_VENDOR_INTEL, 0x106c0 }, /* Intel Atom 230 */
	{ 0, 0 },
};

static const struct cpu_driver driver __cpu_driver = {
	.ops      = &cpu_dev_ops,
	.id_table = cpu_table,
};

