diff options
| author | Timothy Pearson <tpearson@raptorengineeringinc.com> | 2015-02-15 17:11:14 -0600 |
|---|---|---|
| committer | Alexandru Gagniuc <mr.nuke.me@gmail.com> | 2015-02-16 21:04:55 +0100 |
| commit | 03259a8794d82fdb85289bb51e90c2607f8c7016 (patch) | |
| tree | 85bade5122beaa16ab1ce79fdca3db7f3e42e9c3 /src/northbridge | |
| parent | 033bb4bc8d620288ed82fe982a32f567060499b6 (diff) | |
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.c | 29 |
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; |