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authorTimothy Pearson <tpearson@raptorengineeringinc.com>2015-02-16 14:57:06 -0600
committerMarc Jones <marc.jones@se-eng.com>2015-03-13 21:17:58 +0100
commit586d6e2a8800f29cdfb6111a91d6e8fc8f4fc43c (patch)
tree6411cb4093f6a7bb1fb2207b25350e37114b8374 /src/northbridge/amd/amdht
parent668828d3b3ffbe2891d6176379d990e99ae29be7 (diff)
downloadcoreboot-586d6e2a8800f29cdfb6111a91d6e8fc8f4fc43c.tar.xz
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>
Diffstat (limited to 'src/northbridge/amd/amdht')
-rw-r--r--src/northbridge/amd/amdht/h3finit.c40
-rw-r--r--src/northbridge/amd/amdht/h3finit.h3
-rw-r--r--src/northbridge/amd/amdht/ht_wrapper.c3
3 files changed, 42 insertions, 4 deletions
diff --git a/src/northbridge/amd/amdht/h3finit.c b/src/northbridge/amd/amdht/h3finit.c
index 4059182c54..47bf80972f 100644
--- a/src/northbridge/amd/amdht/h3finit.c
+++ b/src/northbridge/amd/amdht/h3finit.c
@@ -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
diff --git a/src/northbridge/amd/amdht/h3finit.h b/src/northbridge/amd/amdht/h3finit.h
index 136a5cf735..a56c2464e3 100644
--- a/src/northbridge/amd/amdht/h3finit.h
+++ b/src/northbridge/amd/amdht/h3finit.h
@@ -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;
/*
diff --git a/src/northbridge/amd/amdht/ht_wrapper.c b/src/northbridge/amd/amdht/ht_wrapper.c
index 3bf81c6bc4..a38caa463e 100644
--- a/src/northbridge/amd/amdht/ht_wrapper.c
+++ b/src/northbridge/amd/amdht/ht_wrapper.c
@@ -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");