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authorTimothy Pearson <tpearson@raptorengineeringinc.com>2015-02-15 17:11:14 -0600
committerAlexandru Gagniuc <mr.nuke.me@gmail.com>2015-02-16 21:04:55 +0100
commit03259a8794d82fdb85289bb51e90c2607f8c7016 (patch)
tree85bade5122beaa16ab1ce79fdca3db7f3e42e9c3 /src/northbridge
parent033bb4bc8d620288ed82fe982a32f567060499b6 (diff)
downloadcoreboot-03259a8794d82fdb85289bb51e90c2607f8c7016.tar.xz
northbridge/amd/amdht: Get maximum HT link frequency from NVRAM
This patch allows the user to set a maximum HT link frequency in NVRAM, paralleling a similar option available in the proprietary BIOS on some mainboards. Change-Id: Iba3789262eefa52421e76533cbf14d9da2ef1de8 Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com> Reviewed-on: http://review.coreboot.org/8462 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Diffstat (limited to 'src/northbridge')
-rw-r--r--src/northbridge/amd/amdht/h3finit.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/src/northbridge/amd/amdht/h3finit.c b/src/northbridge/amd/amdht/h3finit.c
index faa2636a59..4059182c54 100644
--- a/src/northbridge/amd/amdht/h3finit.c
+++ b/src/northbridge/amd/amdht/h3finit.c
@@ -52,6 +52,29 @@
#define APIC_Base_BSP 8
#define APIC_Base 0x1b
+#define NVRAM_LIMIT_HT_SPEED_200 0xf
+#define NVRAM_LIMIT_HT_SPEED_300 0xe
+#define NVRAM_LIMIT_HT_SPEED_400 0xd
+#define NVRAM_LIMIT_HT_SPEED_500 0xc
+#define NVRAM_LIMIT_HT_SPEED_600 0xb
+#define NVRAM_LIMIT_HT_SPEED_800 0xa
+#define NVRAM_LIMIT_HT_SPEED_1000 0x9
+#define NVRAM_LIMIT_HT_SPEED_1200 0x8
+#define NVRAM_LIMIT_HT_SPEED_1400 0x7
+#define NVRAM_LIMIT_HT_SPEED_1600 0x6
+#define NVRAM_LIMIT_HT_SPEED_1800 0x5
+#define NVRAM_LIMIT_HT_SPEED_2000 0x4
+#define NVRAM_LIMIT_HT_SPEED_2200 0x3
+#define NVRAM_LIMIT_HT_SPEED_2400 0x2
+#define NVRAM_LIMIT_HT_SPEED_2600 0x1
+#define NVRAM_LIMIT_HT_SPEED_AUTO 0x0
+
+static const uint16_t ht_speed_limit[16] =
+ {0xFFFF, 0x7FFF, 0x3FFF, 0x1FFF,
+ 0x0FFF, 0x07FF, 0x03FF, 0x01FF,
+ 0x00FF, 0x007F, 0x003F, 0x001F,
+ 0x000F, 0x0007, 0x0003, 0x0001};
+
/*----------------------------------------------------------------------------
* TYPEDEFS AND STRUCTURES
*
@@ -1326,15 +1349,21 @@ static void selectOptimalWidthAndFrequency(sMainData *pDat)
u8 i, j;
u32 temp;
u16 cbPCBFreqLimit;
+ u16 cbPCBFreqLimit_NVRAM;
u8 cbPCBABDownstreamWidth;
u8 cbPCBBAUpstreamWidth;
+ cbPCBFreqLimit_NVRAM = 0xFFFF;
+ if (get_option(&temp, "hypertransport_speed_limit") == CB_SUCCESS)
+ cbPCBFreqLimit_NVRAM = ht_speed_limit[temp & 0xf];
+
for (i = 0; i < pDat->TotalLinks*2; i += 2)
{
/* FIXME
* Mainboards need to be able to set cbPCBFreqLimit
*/
cbPCBFreqLimit = 0xFFFF; // Maximum allowed by autoconfiguration
+ cbPCBFreqLimit = min(cbPCBFreqLimit, cbPCBFreqLimit_NVRAM);
#if CONFIG_EXPERT && CONFIG_LIMIT_HT_DOWN_WIDTH_8
cbPCBABDownstreamWidth = 8;