summaryrefslogtreecommitdiff
path: root/src/southbridge/intel/common/acpi/smbus.asl
blob: cc9c4e2b0a7cf2b6a43d589dd253d4113d4f4186 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
/* SPDX-License-Identifier: GPL-2.0-only */

// Intel SMBus Controller 0:1f.3

Device (SBUS)
{
	Name (_ADR, 0x001f0003)

#ifdef ENABLE_SMBUS_METHODS
	OperationRegion (SMBP, PCI_Config, 0x00, 0x100)
	Field(SMBP, DWordAcc, NoLock, Preserve)
	{
		Offset(0x40),
		,	2,
		I2CE,	1
	}

	OperationRegion (SMBI, SystemIO, SMBUS_IO_BASE, 0x20)
	Field (SMBI, ByteAcc, NoLock, Preserve)
	{
		HSTS,	8,	// Host Status
		,	8,
		HCNT,	8,	// Host Control
		HCMD,	8,	// Host Command
		TXSA,	8,	// Transmit Slave Address
		DAT0,	8,	// Host Data 0
		DAT1,	8,	// Host Data 1
		HBDB,	8,	// Host Block Data Byte
		PECK,	8,	// Packet Error Check
		RXSA,	8,	// Receive Slave Address
		RXDA,	16,	// Receive Slave Data
		AUXS,	8,	// Auxiliary Status
		AUXC,	8,	// Auxiliary Control
		SLPC,	8,	// SMLink Pin Control
		SBPC,	8,	// SMBus Pin Control
		SSTS,	8,	// Slave Status
		SCMD,	8,	// Slave Command
		NADR,	8,	// Notify Device Address
		NDLB,	8,	// Notify Data Low Byte
		NDLH,	8,	// Notify Data High Byte
	}

	// Kill all SMBus communication
	Method (KILL, 0, Serialized)
	{
		HCNT |= 0x02	// Send Kill
		HSTS |= 0xff	// Clean Status
	}

	// Check if last operation completed
	// return	Failure = 0, Success = 1
	Method (CMPL, 0, Serialized)
	{
		Local0 = 4000		// Timeout 200ms in 50us steps
		While (Local0) {
			If (HSTS & 0x02) {	// Completion Status?
				Return (1)	// Operation Completed
			} Else {
				Stall (50)
				Local0--
				If (Local0 == 0) {
					KILL()
				}
			}
		}

		Return (0)		//  Failure
	}


	// Wait for SMBus to become ready
	Method (SRDY, 0, Serialized)
	{
		Local0 = 200	// Timeout 200ms
		While (Local0) {
			If (HSTS & 0x40) {		// IN_USE?
				Sleep(1)		// Wait 1ms
				Local0--	// timeout--
				If (Local0 == 0) {
					Return (1)
				}
			} Else {
				Local0 = 0	// We're ready
			}
		}

		Local0 = 4000	// Timeout 200ms (50us * 4000)
		While (Local0) {
			If (HSTS & 0x01) {		// Host Busy?
				Stall(50)		// Wait 50us
				Local0--	// timeout--
				If (Local0 == 0) {
					KILL()
				}
			} Else {
				Return (0)		// Success
			}
		}

		Return (1)		// Failure
	}

	// SMBus Send Byte
	// Arg0:	Address
	// Arg1:	Data
	// Return:	1 = Success, 0=Failure

	Method (SSXB, 2, Serialized)
	{

		// Is the SMBus Controller Ready?
		If (SRDY()) {
			Return (0)
		}

		// Send Byte
		I2CE = 0		// SMBus Enable
		HSTS = 0xbf
		TXSA = Arg0	// Write Address
		HCMD = Arg1	// Write Data

		HCNT = 0x48	// Start + Byte Data Protocol

		If (CMPL()) {
			HSTS |= 0xff	// Clean up
			Return (1)		// Success
		}

		Return (0)
	}


	// SMBus Receive Byte
	// Arg0:	Address
	// Return:	0xffff = Failure, Data (8bit) = Success

	Method (SRXB, 2, Serialized)
	{

		// Is the SMBus Controller Ready?
		If (SRDY()) {
			Return (0xffff)
		}

		// Receive Byte
		I2CE = 0		// SMBus Enable
		HSTS = 0xbf
		TXSA = Arg0 | 1	// Write Address

		HCNT = 0x44	// Start

		If (CMPL()) {
			HSTS |= 0xff	// Clean up
			Return (DAT0)		// Success
		}

		Return (0xffff)
	}


	// SMBus Write Byte
	// Arg0:	Address
	// Arg1:	Command
	// Arg2:	Data
	// Return:	1 = Success, 0=Failure

	Method (SWRB, 3, Serialized)
	{

		// Is the SMBus Controller Ready?
		If (SRDY()) {
			Return (0)
		}

		// Send Byte
		I2CE = 0		// SMBus Enable
		HSTS = 0xbf
		TXSA = Arg0	// Write Address
		HCMD = Arg1	// Write Command
		DAT0 = Arg2	// Write Data

		HCNT = 0x48	// Start + Byte Protocol

		If (CMPL()) {
			HSTS |= 0xff	// Clean up
			Return (1)		// Success
		}

		Return (0)
	}


	// SMBus Read Byte
	// Arg0:	Address
	// Arg1:	Command
	// Return:	0xffff = Failure, Data (8bit) = Success

	Method (SRDB, 2, Serialized)
	{

		// Is the SMBus Controller Ready?
		If (SRDY()) {
			Return (0xffff)
		}

		// Receive Byte
		I2CE = 0			// SMBus Enable
		HSTS = 0xbf
		TXSA = Arg0 | 1	// Write Address
		HCMD = Arg1		// Command

		HCNT = 0x48		// Start

		If (CMPL()) {
			HSTS |= 0xff	// Clean up
			Return (DAT0)		// Success
		}

		Return (0xffff)
	}
#endif
}