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/* 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
}
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