diff options
Diffstat (limited to 'src/southbridge/amd/cimx/sb800/acpi/smbus.asl')
-rw-r--r-- | src/southbridge/amd/cimx/sb800/acpi/smbus.asl | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/src/southbridge/amd/cimx/sb800/acpi/smbus.asl b/src/southbridge/amd/cimx/sb800/acpi/smbus.asl new file mode 100644 index 0000000000..19ae92b5c3 --- /dev/null +++ b/src/southbridge/amd/cimx/sb800/acpi/smbus.asl @@ -0,0 +1,114 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2011 Advanced Micro Devices, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* SMBUS Support */ +Mutex (SBX0, 0x00) +OperationRegion (SMB0, SystemIO, 0xB00, 0x0C) + Field (SMB0, ByteAcc, NoLock, Preserve) { + HSTS, 8, /* SMBUS status */ + SSTS, 8, /* SMBUS slave status */ + HCNT, 8, /* SMBUS control */ + HCMD, 8, /* SMBUS host cmd */ + HADD, 8, /* SMBUS address */ + DAT0, 8, /* SMBUS data0 */ + DAT1, 8, /* SMBUS data1 */ + BLKD, 8, /* SMBUS block data */ + SCNT, 8, /* SMBUS slave control */ + SCMD, 8, /* SMBUS shaow cmd */ + SEVT, 8, /* SMBUS slave event */ + SDAT, 8 /* SMBUS slave data */ +} + +Method (WCLR, 0, NotSerialized) { /* clear SMBUS status register */ + Store (0x1E, HSTS) + Store (0xFA, Local0) + While (LAnd (LNotEqual (And (HSTS, 0x1E), Zero), LGreater (Local0, Zero))) { + Stall (0x64) + Decrement (Local0) + } + + Return (Local0) +} + +Method (SWTC, 1, NotSerialized) { + Store (Arg0, Local0) + Store (0x07, Local2) + Store (One, Local1) + While (LEqual (Local1, One)) { + Store (And (HSTS, 0x1E), Local3) + If (LNotEqual (Local3, Zero)) { /* read sucess */ + If (LEqual (Local3, 0x02)) { + Store (Zero, Local2) + } + + Store (Zero, Local1) + } + Else { + If (LLess (Local0, 0x0A)) { /* read failure */ + Store (0x10, Local2) + Store (Zero, Local1) + } + Else { + Sleep (0x0A) /* 10 ms, try again */ + Subtract (Local0, 0x0A, Local0) + } + } + } + + Return (Local2) +} + +Method (SMBR, 3, NotSerialized) { + Store (0x07, Local0) + If (LEqual (Acquire (SBX0, 0xFFFF), Zero)) { + Store (WCLR (), Local0) /* clear SMBUS status register before read data */ + If (LEqual (Local0, Zero)) { + Release (SBX0) + Return (0x0) + } + + Store (0x1F, HSTS) + Store (Or (ShiftLeft (Arg1, One), One), HADD) + Store (Arg2, HCMD) + If (LEqual (Arg0, 0x07)) { + Store (0x48, HCNT) /* read byte */ + } + + Store (SWTC (0x03E8), Local1) /* 1000 ms */ + If (LEqual (Local1, Zero)) { + If (LEqual (Arg0, 0x07)) { + Store (DAT0, Local0) + } + } + Else { + Store (Local1, Local0) + } + + Release (SBX0) + } + + /* DBGO("the value of SMBusData0 register ") */ + /* DBGO(Arg2) */ + /* DBGO(" is ") */ + /* DBGO(Local0) */ + /* DBGO("\n") */ + + Return (Local0) +} + |