c418d4eb9e
Make use of the SMFI command interface to forward logs from edk2 to System76 EC. Signed-off-by: Jeremy Soller <jeremy@system76.com> Signed-off-by: Tim Crawford <tcrawford@system76.com>
145 lines
2.5 KiB
C
145 lines
2.5 KiB
C
/** @file
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System76 EC logging
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Copyright (c) 2020 System76, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/IoLib.h>
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// From coreboot/src/drivers/system76_ec/system76_ec.c {
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#define SYSTEM76_EC_BASE 0x0E00
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static inline UINT8 system76_ec_read(UINT8 addr) {
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return IoRead8(SYSTEM76_EC_BASE + (UINT16)addr);
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}
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static inline void system76_ec_write(UINT8 addr, UINT8 data) {
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IoWrite8(SYSTEM76_EC_BASE + (UINT16)addr, data);
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}
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void system76_ec_init(void) {
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// Clear entire command region
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for (int i = 0; i < 256; i++) {
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system76_ec_write((UINT8)i, 0);
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}
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}
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void system76_ec_flush(void) {
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// Send command
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system76_ec_write(0, 4);
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// Wait for command completion
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while (system76_ec_read(0) != 0) {}
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// Clear length
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system76_ec_write(3, 0);
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}
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void system76_ec_print(UINT8 byte) {
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// Read length
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UINT8 len = system76_ec_read(3);
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// Write data at offset
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system76_ec_write(len + 4, byte);
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// Update length
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system76_ec_write(3, len + 1);
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// If we hit the end of the buffer, or were given a newline, flush
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if (byte == '\n' || len >= 128) {
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system76_ec_flush();
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}
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}
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// } From coreboot/src/drivers/system76_ec/system76_ec.c
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// Implement SerialPortLib {
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#include <Library/SerialPortLib.h>
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RETURN_STATUS
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EFIAPI
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SerialPortInitialize (
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VOID
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)
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{
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system76_ec_init();
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return RETURN_SUCCESS;
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}
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UINTN
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EFIAPI
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SerialPortWrite (
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IN UINT8 *Buffer,
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IN UINTN NumberOfBytes
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)
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{
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if (Buffer == NULL) {
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return 0;
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}
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if (NumberOfBytes == 0) {
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system76_ec_flush();
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return 0;
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}
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for(UINTN i = 0; i < NumberOfBytes; i++) {
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system76_ec_print(Buffer[i]);
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}
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return NumberOfBytes;
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}
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BOOLEAN
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EFIAPI
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SerialPortPoll (
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VOID
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)
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{
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return FALSE;
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}
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RETURN_STATUS
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EFIAPI
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SerialPortGetControl (
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OUT UINT32 *Control
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)
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{
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return RETURN_UNSUPPORTED;
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}
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RETURN_STATUS
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EFIAPI
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SerialPortSetControl (
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IN UINT32 Control
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)
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{
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return RETURN_UNSUPPORTED;
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}
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RETURN_STATUS
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EFIAPI
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SerialPortSetAttributes (
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IN OUT UINT64 *BaudRate,
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IN OUT UINT32 *ReceiveFifoDepth,
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IN OUT UINT32 *Timeout,
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IN OUT EFI_PARITY_TYPE *Parity,
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IN OUT UINT8 *DataBits,
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IN OUT EFI_STOP_BITS_TYPE *StopBits
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)
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{
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return RETURN_UNSUPPORTED;
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}
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// } Implement SerialPortLib
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// Implement PlatformHookLib {
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#include <Library/PlatformHookLib.h>
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RETURN_STATUS
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EFIAPI
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PlatformHookSerialPortInitialize (
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VOID
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)
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{
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return RETURN_SUCCESS;
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}
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// } Implement PlatformHookLib
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