path: root/src/cpu/amd/model_fxx/model_fxx_init.c

/* Needed so the AMD K8 runs correctly.  */
#include <console/console.h>
#include <cpu/x86/msr.h>
#include <cpu/amd/mtrr.h>
#include <device/device.h>
#include <device/device.h>
#include <device/pci.h>
#include <string.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/pae.h>
#include <pc80/mc146818rtc.h>
#include <cpu/x86/lapic.h>
#include "../../../northbridge/amd/amdk8/amdk8.h"
#include "../../../northbridge/amd/amdk8/cpu_rev.c"
#include <cpu/cpu.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/mem.h>
#include "model_fxx_msr.h"

#define MCI_STATUS 0x401

static inline msr_t rdmsr_amd(unsigned index)
{
        msr_t result;
        __asm__ __volatile__ (
                "rdmsr"
                : "=a" (result.lo), "=d" (result.hi)
                : "c" (index), "D" (0x9c5a203a)
                );
        return result;
}

static inline void wrmsr_amd(unsigned index, msr_t msr)
{
        __asm__ __volatile__ (
                "wrmsr"
                : /* No outputs */
                : "c" (index), "a" (msr.lo), "d" (msr.hi), "D" (0x9c5a203a)
                );
}



#define MTRR_COUNT 8
#define ZERO_CHUNK_KB 0x800UL /* 2M */
#define TOLM_KB 0x400000UL

struct mtrr {
	msr_t base;
	msr_t mask;
};
struct mtrr_state {
	struct mtrr mtrrs[MTRR_COUNT];
	msr_t top_mem, top_mem2;
	msr_t def_type;
};

static void save_mtrr_state(struct mtrr_state *state)
{
	int i;
	for(i = 0; i < MTRR_COUNT; i++) {
		state->mtrrs[i].base = rdmsr(MTRRphysBase_MSR(i));
		state->mtrrs[i].mask = rdmsr(MTRRphysMask_MSR(i));
	}
	state->top_mem  = rdmsr(TOP_MEM);
	state->top_mem2 = rdmsr(TOP_MEM2);
	state->def_type = rdmsr(MTRRdefType_MSR);
}

static void restore_mtrr_state(struct mtrr_state *state)
{
	int i;
	disable_cache();

	for(i = 0; i < MTRR_COUNT; i++) {
		wrmsr(MTRRphysBase_MSR(i), state->mtrrs[i].base);
		wrmsr(MTRRphysMask_MSR(i), state->mtrrs[i].mask);
	}
	wrmsr(TOP_MEM,         state->top_mem);
	wrmsr(TOP_MEM2,        state->top_mem2);
	wrmsr(MTRRdefType_MSR, state->def_type);

	enable_cache();
}


#if 0
static void print_mtrr_state(struct mtrr_state *state)
{
	int i;
	for(i = 0; i < MTRR_COUNT; i++) {
		printk_debug("var mtrr %d: %08x%08x mask: %08x%08x\n",
			i,
			state->mtrrs[i].base.hi, state->mtrrs[i].base.lo,
			state->mtrrs[i].mask.hi, state->mtrrs[i].mask.lo);
	}
	printk_debug("top_mem:  %08x%08x\n",
		state->top_mem.hi, state->top_mem.lo);
	printk_debug("top_mem2: %08x%08x\n",
		state->top_mem2.hi, state->top_mem2.lo);
	printk_debug("def_type: %08x%08x\n",
		state->def_type.hi, state->def_type.lo);
}
#endif

static void set_init_ecc_mtrrs(void)
{
	msr_t msr;
	int i;
	disable_cache();

	/* First clear all of the msrs to be safe */
	for(i = 0; i < MTRR_COUNT; i++) {
		msr_t zero;
		zero.lo = zero.hi = 0;
		wrmsr(MTRRphysBase_MSR(i), zero);
		wrmsr(MTRRphysMask_MSR(i), zero);
	}

	/* Write back cache the first 1MB */
	msr.hi = 0x00000000;
	msr.lo = 0x00000000 | MTRR_TYPE_WRBACK;
	wrmsr(MTRRphysBase_MSR(0), msr);
	msr.hi = 0x000000ff;
	msr.lo = ~((CONFIG_LB_MEM_TOPK << 10) - 1) | 0x800;
	wrmsr(MTRRphysMask_MSR(0), msr);

	/* Set the default type to write combining */
	msr.hi = 0x00000000;
	msr.lo = 0xc00 | MTRR_TYPE_WRCOMB;
	wrmsr(MTRRdefType_MSR, msr);

	/* Set TOP_MEM to 4G */
	msr.hi = 0x00000001;
	msr.lo = 0x00000000;
	wrmsr(TOP_MEM, msr);

	enable_cache();
}


static void init_ecc_memory(void)
{
	unsigned long startk, begink, endk;
	unsigned long basek;
	struct mtrr_state mtrr_state;
	device_t f1_dev, f2_dev, f3_dev;
	int node_id;
	int enable_scrubbing;
	uint32_t dcl;
	
	/* For now there is a 1-1 mapping between node_id and cpu_id */
	node_id = lapicid();

	f1_dev = dev_find_slot(0, PCI_DEVFN(0x18 + node_id, 1));
	if (!f1_dev) {
		die("Cannot find cpu function 1\n");
	}
	f2_dev = dev_find_slot(0, PCI_DEVFN(0x18 + node_id, 2));
	if (!f2_dev) {
		die("Cannot find cpu function 2\n");
	}
	f3_dev = dev_find_slot(0, PCI_DEVFN(0x18 + node_id, 3));
	if (!f3_dev) {
		die("Cannot find cpu function 3\n");
	}

	/* See if we scrubbing should be enabled */
	enable_scrubbing = 1;
	get_option(&enable_scrubbing, "hw_scrubber");

	/* Enable cache scrubbing at the lowest possible rate */
	if (enable_scrubbing) {
		pci_write_config32(f3_dev, SCRUB_CONTROL,
			(SCRUB_84ms << 16) | (SCRUB_84ms << 8) | (SCRUB_NONE << 0));
	} else {
		pci_write_config32(f3_dev, SCRUB_CONTROL,
			(SCRUB_NONE << 16) | (SCRUB_NONE << 8) | (SCRUB_NONE << 0));
		printk_debug("Scrubbing Disabled\n");
	}
	

	/* If ecc support is not enabled don't touch memory */
	dcl = pci_read_config32(f2_dev, DRAM_CONFIG_LOW);
	if (!(dcl & DCL_DimmEccEn)) {
		return;
	}

	startk = (pci_read_config32(f1_dev, 0x40 + (node_id*8)) & 0xffff0000) >> 2;
	endk   = ((pci_read_config32(f1_dev, 0x44 + (node_id*8)) & 0xffff0000) >> 2) + 0x4000;

	/* Don't start too early */
	begink = startk;
	if (begink < CONFIG_LB_MEM_TOPK) {
		begink = CONFIG_LB_MEM_TOPK;
	}
	printk_debug("Clearing memory %uK - %uK: ", startk, endk);

	/* Save the normal state */
	save_mtrr_state(&mtrr_state);

	/* Switch to the init ecc state */
	set_init_ecc_mtrrs();
	disable_lapic();

	/* Walk through 2M chunks and zero them */
	for(basek = begink; basek < endk; basek = ((basek + ZERO_CHUNK_KB) & ~(ZERO_CHUNK_KB - 1))) {
		unsigned long limitk;
		unsigned long size;
		void *addr;

		/* Report every 64M */
		if ((basek % (64*1024)) == 0) {
			/* Restore the normal state */
			map_2M_page(0);
			restore_mtrr_state(&mtrr_state);
			enable_lapic();

			/* Print a status message */
			printk_debug("%c", (basek >= TOLM_KB)?'+':'-');

			/* Return to the initialization state */
			set_init_ecc_mtrrs();
			disable_lapic();
		}
		limitk = (basek + ZERO_CHUNK_KB) & ~(ZERO_CHUNK_KB - 1);
		if (limitk > endk) {
			limitk = endk;
		}
		size = (limitk - basek) << 10;
		addr = map_2M_page(basek >> 11);
		addr = (void *)(((uint32_t)addr) | ((basek & 0x7ff) << 10));
		if (addr == MAPPING_ERROR) {
			continue;
		}

		/* clear memory 2M (limitk - basek) */
		clear_memory(addr, size);
	}
	/* Restore the normal state */
	map_2M_page(0);
	restore_mtrr_state(&mtrr_state);
	enable_lapic();

	/* Set the scrub base address registers */
	pci_write_config32(f3_dev, SCRUB_ADDR_LOW,  startk << 10);
	pci_write_config32(f3_dev, SCRUB_ADDR_HIGH, startk >> 22);

	/* Enable the scrubber? */
	if (enable_scrubbing) {
		/* Enable scrubbing at the lowest possible rate */
		pci_write_config32(f3_dev, SCRUB_CONTROL,
			(SCRUB_84ms << 16) | (SCRUB_84ms << 8) | (SCRUB_84ms << 0));
	}

	printk_debug(" done\n");
}

static inline void k8_errata(void)
{
	msr_t msr;
	if (is_cpu_pre_c0()) {
		/* Erratum 63... */
		msr = rdmsr(HWCR_MSR);
		msr.lo |= (1 << 6);
		wrmsr(HWCR_MSR, msr);

		/* Erratum 69... */
		msr = rdmsr_amd(BU_CFG_MSR);
		msr.hi |= (1 << (45 - 32));
		wrmsr_amd(BU_CFG_MSR, msr);

		/* Erratum 81... */
		msr = rdmsr_amd(DC_CFG_MSR);
		msr.lo |=  (1 << 10);
		wrmsr_amd(DC_CFG_MSR, msr);
			
	}
	/* I can't touch this msr on early buggy cpus */
	if (!is_cpu_pre_b3()) {

		/* Erratum 89 ... */
		msr = rdmsr(NB_CFG_MSR);
		msr.lo |= 1 << 3;
		
		if (!is_cpu_pre_c0()) {
			/* Erratum 86 Disable data masking on C0 and 
			 * later processor revs.
			 * FIXME this is only needed if ECC is enabled.
			 */
			msr.hi |= 1 << (36 - 32);
		}	
		wrmsr(NB_CFG_MSR, msr);
	}
	
	/* Erratum 97 ... */
	if (!is_cpu_pre_c0()) {
		msr = rdmsr_amd(DC_CFG_MSR);
		msr.lo |= 1 << 3;
		wrmsr_amd(DC_CFG_MSR, msr);
	}	
	
	/* Erratum 94 ... */
	msr = rdmsr_amd(IC_CFG_MSR);
	msr.lo |= 1 << 11;
	wrmsr_amd(IC_CFG_MSR, msr);

	/* Erratum 91 prefetch miss is handled in the kernel */
}

void model_fxx_init(device_t dev)
{
	unsigned long mmio_basek, tomk;
	unsigned long i;
	msr_t msr;

	/* Turn on caching if we haven't already */
	x86_enable_cache();
	amd_setup_mtrrs();
	x86_mtrr_check();

	disable_cache();
	
	/* zero the machine check error status registers */
	msr.lo = 0;
	msr.hi = 0;
	for(i=0; i<5; i++) {
		wrmsr(MCI_STATUS + (i*4),msr);
	}

	k8_errata();
	
	enable_cache();

	/* Is this a bad location?  In particular can another node prefecth
	 * data from this node before we have initialized it?
	 */
	init_ecc_memory();

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

static struct device_operations cpu_dev_ops = {
	.init = model_fxx_init,
};
static struct cpu_device_id cpu_table[] = {
	{ X86_VENDOR_AMD, 0xf50 }, /* B3 */
	{ X86_VENDOR_AMD, 0xf51 }, /* SH7-B3 */
	{ X86_VENDOR_AMD, 0xf58 }, /* SH7-C0 */
	{ X86_VENDOR_AMD, 0xf48 },
#if 1
	{ X86_VENDOR_AMD, 0xf5A }, /* SH7-CG */
	{ X86_VENDOR_AMD, 0xf4A },
	{ X86_VENDOR_AMD, 0xf7A },
	{ X86_VENDOR_AMD, 0xfc0 }, /* DH7-CG */
	{ X86_VENDOR_AMD, 0xfe0 },
	{ X86_VENDOR_AMD, 0xff0 },
	{ X86_VENDOR_AMD, 0xf82 }, /* CH7-CG */
	{ X86_VENDOR_AMD, 0xfb2 },
#endif
	{ 0, 0 },
};
static struct cpu_driver model_fxx __cpu_driver = {
	.ops      = &cpu_dev_ops,
	.id_table = cpu_table,
};