[edk2-devel] [edk2-platforms][PATCH v3 1/7] KabylakeOpenBoardPkg/BaseEcLib: Add some common EC commands
Benjamin Doron
benjamin.doron00 at gmail.com
Wed Aug 18 18:48:56 UTC 2021
Add EC read (0x80) and write (0x81) commands, as defined by ACPI.
Cc: Chasel Chiu <chasel.chiu at intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone at intel.com>
Cc: Isaac Oram <isaac.w.oram at intel.com>
Cc: Michael Kubacki <michael.kubacki at microsoft.com>
Signed-off-by: Benjamin Doron <benjamin.doron00 at gmail.com>
---
Platform/Intel/KabylakeOpenBoardPkg/Include/Library/EcLib.h | 32 +++++++++
Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/Include/EcCommands.h | 2 +
Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/BaseEcLib.c | 4 +-
Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/BaseEcLib.inf | 1 +
Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/EcCommands.c | 76 ++++++++++++++++++++
5 files changed, 114 insertions(+), 1 deletion(-)
diff --git a/Platform/Intel/KabylakeOpenBoardPkg/Include/Library/EcLib.h b/Platform/Intel/KabylakeOpenBoardPkg/Include/Library/EcLib.h
index 04ce076f91b7..7c58e592d965 100644
--- a/Platform/Intel/KabylakeOpenBoardPkg/Include/Library/EcLib.h
+++ b/Platform/Intel/KabylakeOpenBoardPkg/Include/Library/EcLib.h
@@ -103,4 +103,36 @@ LpcEcInterface (
IN OUT UINT8 *DataBuffer
);
+/**
+ Read a byte of EC RAM.
+
+ @param[in] Address Address to read
+ @param[out] Data Data received
+
+ @retval EFI_SUCCESS Command success
+ @retval EFI_DEVICE_ERROR Command error
+ @retval EFI_TIMEOUT Command timeout
+**/
+EFI_STATUS
+EcRead (
+ IN UINT8 Address,
+ OUT UINT8 *Data
+ );
+
+/**
+ Write a byte of EC RAM.
+
+ @param[in] Address Address to write
+ @param[in] Data Data to write
+
+ @retval EFI_SUCCESS Command success
+ @retval EFI_DEVICE_ERROR Command error
+ @retval EFI_TIMEOUT Command timeout
+**/
+EFI_STATUS
+EcWrite (
+ IN UINT8 Address,
+ IN UINT8 Data
+ );
+
#endif
diff --git a/Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/Include/EcCommands.h b/Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/Include/EcCommands.h
index be56d134edc7..a4ab192d8ce1 100644
--- a/Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/Include/EcCommands.h
+++ b/Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/Include/EcCommands.h
@@ -40,5 +40,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
// Data read from the EC data port is valid only when OBF=1.
//
#define EC_C_FAB_ID 0x0D // Get the board fab ID in the lower 3 bits
+#define EC_C_ACPI_READ 0x80 // Read a byte of EC RAM
+#define EC_C_ACPI_WRITE 0x81 // Write a byte of EC RAM
#endif // EC_COMMANDS_H_
diff --git a/Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/BaseEcLib.c b/Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/BaseEcLib.c
index eda6f7d2e142..66bd478906fb 100644
--- a/Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/BaseEcLib.c
+++ b/Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/BaseEcLib.c
@@ -32,7 +32,9 @@ typedef struct {
} EC_COMMAND_TABLE;
EC_COMMAND_TABLE mEcCommand[] = {
- {EC_C_FAB_ID , 0, 2, TRUE} // Get the board fab ID in the lower 3 bits
+ {EC_C_FAB_ID , 0, 2, TRUE}, // Get the board fab ID in the lower 3 bits
+ {EC_C_ACPI_READ , 1, 1, TRUE}, // Read a byte of EC RAM
+ {EC_C_ACPI_WRITE , 2, 0, TRUE} // Write a byte of EC RAM
};
//
diff --git a/Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/BaseEcLib.inf b/Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/BaseEcLib.inf
index c7de77d80f3d..f0b4c67fffc2 100644
--- a/Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/BaseEcLib.inf
+++ b/Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/BaseEcLib.inf
@@ -27,3 +27,4 @@
[Sources]
BaseEcLib.c
+ EcCommands.c
diff --git a/Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/EcCommands.c b/Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/EcCommands.c
new file mode 100644
index 000000000000..d14edb75de36
--- /dev/null
+++ b/Platform/Intel/KabylakeOpenBoardPkg/Library/BaseEcLib/EcCommands.c
@@ -0,0 +1,76 @@
+/** @file
+ Common EC commands.
+
+Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Uefi.h>
+#include <Library/EcLib.h>
+
+/**
+ Read a byte of EC RAM.
+
+ @param[in] Address Address to read
+ @param[out] Data Data received
+
+ @retval EFI_SUCCESS Command success
+ @retval EFI_DEVICE_ERROR Command error
+ @retval EFI_TIMEOUT Command timeout
+**/
+EFI_STATUS
+EcRead (
+ IN UINT8 Address,
+ OUT UINT8 *Data
+ )
+{
+ UINT8 DataSize;
+ UINT8 DataBuffer[1];
+ EFI_STATUS Status;
+
+ if (Data == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ // Prepare arguments for LpcEcInterface()
+ DataSize = 1;
+ DataBuffer[0] = Address;
+
+ Status = LpcEcInterface (EC_C_ACPI_READ, &DataSize, DataBuffer);
+ if (EFI_ERROR(Status)) {
+ return Status;
+ }
+
+ // Write caller's pointer from returned data and return success
+ *Data = DataBuffer[0];
+ return EFI_SUCCESS;
+}
+
+/**
+ Write a byte of EC RAM.
+
+ @param[in] Address Address to write
+ @param[in] Data Data to write
+
+ @retval EFI_SUCCESS Command success
+ @retval EFI_DEVICE_ERROR Command error
+ @retval EFI_TIMEOUT Command timeout
+**/
+EFI_STATUS
+EcWrite (
+ IN UINT8 Address,
+ IN UINT8 Data
+ )
+{
+ UINT8 DataSize;
+ UINT8 DataBuffer[2];
+
+ // Prepare arguments for LpcEcInterface()
+ DataSize = 2;
+ DataBuffer[0] = Address;
+ DataBuffer[1] = Data;
+
+ return LpcEcInterface (EC_C_ACPI_WRITE, &DataSize, DataBuffer);
+}
--
2.31.1
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