| Mike Loptien | 573a1d6 | 2013-03-18 11:19:26 -0600 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2011 Advanced Micro Devices, Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| Patrick Georgi | b890a12 | 2015-03-26 15:17:45 +0100 | [diff] [blame] | 17 | * Foundation, Inc. |
| Mike Loptien | 573a1d6 | 2013-03-18 11:19:26 -0600 | [diff] [blame] | 18 | */ |
| 19 | |
| 20 | /* SMBUS Support */ |
| 21 | Mutex (SBX0, 0x00) |
| 22 | OperationRegion (SMB0, SystemIO, 0xB00, 0x0C) |
| 23 | Field (SMB0, ByteAcc, NoLock, Preserve) { |
| Paul Menzel | 7b1a8a7 | 2015-06-14 11:55:27 +0200 | [diff] [blame^] | 24 | HSTS, 8, /* SMBUS status */ |
| Mike Loptien | 573a1d6 | 2013-03-18 11:19:26 -0600 | [diff] [blame] | 25 | SSTS, 8, /* SMBUS slave status */ |
| 26 | HCNT, 8, /* SMBUS control */ |
| 27 | HCMD, 8, /* SMBUS host cmd */ |
| 28 | HADD, 8, /* SMBUS address */ |
| 29 | DAT0, 8, /* SMBUS data0 */ |
| 30 | DAT1, 8, /* SMBUS data1 */ |
| 31 | BLKD, 8, /* SMBUS block data */ |
| 32 | SCNT, 8, /* SMBUS slave control */ |
| Paul Menzel | 4159a80 | 2013-07-14 00:24:31 +0200 | [diff] [blame] | 33 | SCMD, 8, /* SMBUS shadow cmd */ |
| Mike Loptien | 573a1d6 | 2013-03-18 11:19:26 -0600 | [diff] [blame] | 34 | SEVT, 8, /* SMBUS slave event */ |
| Paul Menzel | 7b1a8a7 | 2015-06-14 11:55:27 +0200 | [diff] [blame^] | 35 | SDAT, 8 /* SMBUS slave data */ |
| Mike Loptien | 573a1d6 | 2013-03-18 11:19:26 -0600 | [diff] [blame] | 36 | } |
| 37 | |
| 38 | Method (WCLR, 0, NotSerialized) { /* clear SMBUS status register */ |
| 39 | Store (0x1E, HSTS) |
| 40 | Store (0xFA, Local0) |
| 41 | While (LAnd (LNotEqual (And (HSTS, 0x1E), Zero), LGreater (Local0, Zero))) { |
| 42 | Stall (0x64) |
| 43 | Decrement (Local0) |
| 44 | } |
| 45 | |
| 46 | Return (Local0) |
| 47 | } |
| 48 | |
| 49 | Method (SWTC, 1, NotSerialized) { |
| 50 | Store (Arg0, Local0) |
| 51 | Store (0x07, Local2) |
| 52 | Store (One, Local1) |
| 53 | While (LEqual (Local1, One)) { |
| 54 | Store (And (HSTS, 0x1E), Local3) |
| 55 | If (LNotEqual (Local3, Zero)) { /* read sucess */ |
| 56 | If (LEqual (Local3, 0x02)) { |
| 57 | Store (Zero, Local2) |
| 58 | } |
| 59 | |
| 60 | Store (Zero, Local1) |
| 61 | } |
| 62 | Else { |
| 63 | If (LLess (Local0, 0x0A)) { /* read failure */ |
| 64 | Store (0x10, Local2) |
| 65 | Store (Zero, Local1) |
| 66 | } |
| 67 | Else { |
| 68 | Sleep (0x0A) /* 10 ms, try again */ |
| 69 | Subtract (Local0, 0x0A, Local0) |
| 70 | } |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | Return (Local2) |
| 75 | } |
| 76 | |
| 77 | Method (SMBR, 3, NotSerialized) { |
| 78 | Store (0x07, Local0) |
| 79 | If (LEqual (Acquire (SBX0, 0xFFFF), Zero)) { |
| 80 | Store (WCLR (), Local0) /* clear SMBUS status register before read data */ |
| 81 | If (LEqual (Local0, Zero)) { |
| 82 | Release (SBX0) |
| 83 | Return (0x0) |
| 84 | } |
| 85 | |
| 86 | Store (0x1F, HSTS) |
| 87 | Store (Or (ShiftLeft (Arg1, One), One), HADD) |
| 88 | Store (Arg2, HCMD) |
| 89 | If (LEqual (Arg0, 0x07)) { |
| 90 | Store (0x48, HCNT) /* read byte */ |
| 91 | } |
| 92 | |
| 93 | Store (SWTC (0x03E8), Local1) /* 1000 ms */ |
| 94 | If (LEqual (Local1, Zero)) { |
| 95 | If (LEqual (Arg0, 0x07)) { |
| 96 | Store (DAT0, Local0) |
| 97 | } |
| 98 | } |
| 99 | Else { |
| 100 | Store (Local1, Local0) |
| 101 | } |
| 102 | |
| 103 | Release (SBX0) |
| 104 | } |
| 105 | |
| 106 | /* DBGO("the value of SMBusData0 register ") */ |
| 107 | /* DBGO(Arg2) */ |
| 108 | /* DBGO(" is ") */ |
| 109 | /* DBGO(Local0) */ |
| 110 | /* DBGO("\n") */ |
| 111 | |
| 112 | Return (Local0) |
| 113 | } |