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northbridge/amd/amdht: Allow mainboards to set HT frequency limit 

This is useful when the PCB layout of a mainboard does not allow
stable operation at the increased HyperTransport speeds of newer
processors.

Change-Id: Idc93a1294608178ddf38ca72d40e6bad7deb9004
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/8464
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
This commit is contained in:
Timothy Pearson 2015-02-16 14:57:06 -06:00 committed by Marc Jones
parent 668828d3b3
commit 586d6e2a88
4 changed files with 49 additions and 4 deletions
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7
src/northbridge/amd/amdfam10/amdfam10.h
View File

@ -1,6 +1,7 @@
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
* Copyright (C) 2007 Advanced Micro Devices, Inc.
*
* This program is free software; you can redistribute it and/or modify
@ -1002,6 +1003,10 @@ struct nodes_info_t {
u32 up_planes; // down planes will be [up_planes, planes)
} __attribute__((packed));
struct ht_link_config {
uint8_t ht_speed_limit; // Speed in MHz; 0 for autodetect (default)
};
/* be careful with the alignment of sysinfo, bacause sysinfo may be shared by coreboot_car and ramstage stage. and ramstage may be running at 64bit later.*/
struct sys_info {
@ -1015,6 +1020,8 @@ struct sys_info {
u8 host_link_freq[NODE_NUMS*8]; // record freq for every link from cpu, 0x0f means don't need to touch it
u16 host_link_freq_cap[NODE_NUMS*8]; //cap
struct ht_link_config ht_link_cfg;
u32 segbit;
u32 sbdn;
u32 sblk;

40
src/northbridge/amd/amdht/h3finit.c
View File

@ -75,6 +75,41 @@ static const uint16_t ht_speed_limit[16] =
0x00FF, 0x007F, 0x003F, 0x001F,
0x000F, 0x0007, 0x0003, 0x0001};
static const struct ht_speed_limit_map_t {
uint16_t mhz;
uint8_t config;
} ht_speed_limit_map[] = {
{0, NVRAM_LIMIT_HT_SPEED_AUTO},
{200, NVRAM_LIMIT_HT_SPEED_200},
{300, NVRAM_LIMIT_HT_SPEED_300},
{400, NVRAM_LIMIT_HT_SPEED_400},
{500, NVRAM_LIMIT_HT_SPEED_500},
{600, NVRAM_LIMIT_HT_SPEED_600},
{800, NVRAM_LIMIT_HT_SPEED_800},
{1000, NVRAM_LIMIT_HT_SPEED_1000},
{1200, NVRAM_LIMIT_HT_SPEED_1200},
{1400, NVRAM_LIMIT_HT_SPEED_1400},
{1600, NVRAM_LIMIT_HT_SPEED_1600},
{1800, NVRAM_LIMIT_HT_SPEED_1800},
{2000, NVRAM_LIMIT_HT_SPEED_2000},
{2200, NVRAM_LIMIT_HT_SPEED_2200},
{2400, NVRAM_LIMIT_HT_SPEED_2400},
{2600, NVRAM_LIMIT_HT_SPEED_2600},
};
static const uint16_t ht_speed_mhz_to_hw(uint16_t mhz)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(ht_speed_limit_map); i++)
if (ht_speed_limit_map[i].mhz == mhz)
return ht_speed_limit_map[i].config;
printk(BIOS_WARNING,
"WARNING: Invalid HT link limit frequency %d specified, ignoring...\n",
mhz);
return ht_speed_limit[NVRAM_LIMIT_HT_SPEED_AUTO];
}
/*----------------------------------------------------------------------------
* TYPEDEFS AND STRUCTURES
*
@ -1359,10 +1394,9 @@ static void selectOptimalWidthAndFrequency(sMainData *pDat)
for (i = 0; i < pDat->TotalLinks*2; i += 2)
{
/* FIXME
* Mainboards need to be able to set cbPCBFreqLimit
*/
cbPCBFreqLimit = 0xFFFF; // Maximum allowed by autoconfiguration
if (pDat->HtBlock->ht_link_configuration)
cbPCBFreqLimit = ht_speed_mhz_to_hw(pDat->HtBlock->ht_link_configuration->ht_speed_limit);
cbPCBFreqLimit = min(cbPCBFreqLimit, cbPCBFreqLimit_NVRAM);
#if CONFIG_EXPERT && CONFIG_LIMIT_HT_DOWN_WIDTH_8

3
src/northbridge/amd/amdht/h3finit.h
View File

@ -1,6 +1,7 @@
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
* Copyright (C) 2007 Advanced Micro Devices, Inc.
*
* This program is free software; you can redistribute it and/or modify
@ -462,6 +463,8 @@ typedef struct {
const u8 *pEventData0
);
const struct ht_link_config *ht_link_configuration;
} AMD_HTBLOCK;
/*

3
src/northbridge/amd/amdht/ht_wrapper.c
View File

@ -139,7 +139,8 @@ static void amd_ht_init(struct sys_info *sysinfo)
NULL, // BOOL (*AMD_CB_CustomizeBuffers)();
NULL, // void (*AMD_CB_OverrideDevicePort)();
NULL, // void (*AMD_CB_OverrideCpuPort)();
AMD_CB_EventNotify // void (*AMD_CB_EventNotify) ();
AMD_CB_EventNotify, // void (*AMD_CB_EventNotify) ();
&sysinfo->ht_link_cfg // struct ht_link_config*
};
printk(BIOS_DEBUG, "Enter amd_ht_init()\n");