diff options
Diffstat (limited to 'MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c')
| -rw-r--r-- | MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c | 2282 |
1 files changed, 1141 insertions, 1141 deletions
diff --git a/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c b/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c index e413cea4b3..794efaaca5 100644 --- a/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c +++ b/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c @@ -1,1141 +1,1141 @@ -/** @file
- 16550 UART Serial Port library functions
-
- (C) Copyright 2014 Hewlett-Packard Development Company, L.P.<BR>
- Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
- Copyright (c) 2018, AMD Incorporated. All rights reserved.<BR>
- Copyright (c) 2020, ARM Limited. All rights reserved.
-
- SPDX-License-Identifier: BSD-2-Clause-Patent
-
-**/
-
-#include <Base.h>
-#include <IndustryStandard/Pci.h>
-#include <Library/SerialPortLib.h>
-#include <Library/PcdLib.h>
-#include <Library/IoLib.h>
-#include <Library/PciLib.h>
-#include <Library/PlatformHookLib.h>
-#include <Library/BaseLib.h>
-
-//
-// PCI Defintions.
-//
-#define PCI_BRIDGE_32_BIT_IO_SPACE 0x01
-
-//
-// 16550 UART register offsets and bitfields
-//
-#define R_UART_RXBUF 0 // LCR_DLAB = 0
-#define R_UART_TXBUF 0 // LCR_DLAB = 0
-#define R_UART_BAUD_LOW 0 // LCR_DLAB = 1
-#define R_UART_BAUD_HIGH 1 // LCR_DLAB = 1
-#define R_UART_IER 1 // LCR_DLAB = 0
-#define R_UART_FCR 2
-#define B_UART_FCR_FIFOE BIT0
-#define B_UART_FCR_FIFO64 BIT5
-#define R_UART_LCR 3
-#define B_UART_LCR_DLAB BIT7
-#define R_UART_MCR 4
-#define B_UART_MCR_DTRC BIT0
-#define B_UART_MCR_RTS BIT1
-#define R_UART_LSR 5
-#define B_UART_LSR_RXRDY BIT0
-#define B_UART_LSR_TXRDY BIT5
-#define B_UART_LSR_TEMT BIT6
-#define R_UART_MSR 6
-#define B_UART_MSR_CTS BIT4
-#define B_UART_MSR_DSR BIT5
-#define B_UART_MSR_RI BIT6
-#define B_UART_MSR_DCD BIT7
-
-//
-// 4-byte structure for each PCI node in PcdSerialPciDeviceInfo
-//
-typedef struct {
- UINT8 Device;
- UINT8 Function;
- UINT16 PowerManagementStatusAndControlRegister;
-} PCI_UART_DEVICE_INFO;
-
-/**
- Read an 8-bit 16550 register. If PcdSerialUseMmio is TRUE, then the value is read from
- MMIO space. If PcdSerialUseMmio is FALSE, then the value is read from I/O space. The
- parameter Offset is added to the base address of the 16550 registers that is specified
- by PcdSerialRegisterBase. PcdSerialRegisterAccessWidth specifies the MMIO space access
- width and defaults to 8 bit access, and supports 8 or 32 bit access.
-
- @param Base The base address register of UART device.
- @param Offset The offset of the 16550 register to read.
-
- @return The value read from the 16550 register.
-
-**/
-UINT8
-SerialPortReadRegister (
- UINTN Base,
- UINTN Offset
- )
-{
- if (PcdGetBool (PcdSerialUseMmio)) {
- if (PcdGet8 (PcdSerialRegisterAccessWidth) == 32) {
- return (UINT8)MmioRead32 (Base + Offset * PcdGet32 (PcdSerialRegisterStride));
- }
-
- return MmioRead8 (Base + Offset * PcdGet32 (PcdSerialRegisterStride));
- } else {
- return IoRead8 (Base + Offset * PcdGet32 (PcdSerialRegisterStride));
- }
-}
-
-/**
- Write an 8-bit 16550 register. If PcdSerialUseMmio is TRUE, then the value is written to
- MMIO space. If PcdSerialUseMmio is FALSE, then the value is written to I/O space. The
- parameter Offset is added to the base address of the 16550 registers that is specified
- by PcdSerialRegisterBase. PcdSerialRegisterAccessWidth specifies the MMIO space access
- width and defaults to 8 bit access, and supports 8 or 32 bit access.
-
- @param Base The base address register of UART device.
- @param Offset The offset of the 16550 register to write.
- @param Value The value to write to the 16550 register specified by Offset.
-
- @return The value written to the 16550 register.
-
-**/
-UINT8
-SerialPortWriteRegister (
- UINTN Base,
- UINTN Offset,
- UINT8 Value
- )
-{
- if (PcdGetBool (PcdSerialUseMmio)) {
- if (PcdGet8 (PcdSerialRegisterAccessWidth) == 32) {
- return (UINT8)MmioWrite32 (Base + Offset * PcdGet32 (PcdSerialRegisterStride), (UINT8)Value);
- }
-
- return MmioWrite8 (Base + Offset * PcdGet32 (PcdSerialRegisterStride), Value);
- } else {
- return IoWrite8 (Base + Offset * PcdGet32 (PcdSerialRegisterStride), Value);
- }
-}
-
-/**
- Update the value of an 16-bit PCI configuration register in a PCI device. If the
- PCI Configuration register specified by PciAddress is already programmed with a
- non-zero value, then return the current value. Otherwise update the PCI configuration
- register specified by PciAddress with the value specified by Value and return the
- value programmed into the PCI configuration register. All values must be masked
- using the bitmask specified by Mask.
-
- @param PciAddress PCI Library address of the PCI Configuration register to update.
- @param Value The value to program into the PCI Configuration Register.
- @param Mask Bitmask of the bits to check and update in the PCI configuration register.
-
-**/
-UINT16
-SerialPortLibUpdatePciRegister16 (
- UINTN PciAddress,
- UINT16 Value,
- UINT16 Mask
- )
-{
- UINT16 CurrentValue;
-
- CurrentValue = PciRead16 (PciAddress) & Mask;
- if (CurrentValue != 0) {
- return CurrentValue;
- }
-
- return PciWrite16 (PciAddress, Value & Mask);
-}
-
-/**
- Update the value of an 32-bit PCI configuration register in a PCI device. If the
- PCI Configuration register specified by PciAddress is already programmed with a
- non-zero value, then return the current value. Otherwise update the PCI configuration
- register specified by PciAddress with the value specified by Value and return the
- value programmed into the PCI configuration register. All values must be masked
- using the bitmask specified by Mask.
-
- @param PciAddress PCI Library address of the PCI Configuration register to update.
- @param Value The value to program into the PCI Configuration Register.
- @param Mask Bitmask of the bits to check and update in the PCI configuration register.
-
- @return The Secondary bus number that is actually programed into the PCI to PCI Bridge device.
-
-**/
-UINT32
-SerialPortLibUpdatePciRegister32 (
- UINTN PciAddress,
- UINT32 Value,
- UINT32 Mask
- )
-{
- UINT32 CurrentValue;
-
- CurrentValue = PciRead32 (PciAddress) & Mask;
- if (CurrentValue != 0) {
- return CurrentValue;
- }
-
- return PciWrite32 (PciAddress, Value & Mask);
-}
-
-/**
- Retrieve the I/O or MMIO base address register for the PCI UART device.
-
- This function assumes Root Bus Numer is Zero, and enables I/O and MMIO in PCI UART
- Device if they are not already enabled.
-
- @return The base address register of the UART device.
-
-**/
-UINTN
-GetSerialRegisterBase (
- VOID
- )
-{
- UINTN PciLibAddress;
- UINTN BusNumber;
- UINTN SubordinateBusNumber;
- UINT32 ParentIoBase;
- UINT32 ParentIoLimit;
- UINT16 ParentMemoryBase;
- UINT16 ParentMemoryLimit;
- UINT32 IoBase;
- UINT32 IoLimit;
- UINT16 MemoryBase;
- UINT16 MemoryLimit;
- UINTN SerialRegisterBase;
- UINTN BarIndex;
- UINT32 RegisterBaseMask;
- PCI_UART_DEVICE_INFO *DeviceInfo;
-
- //
- // Get PCI Device Info
- //
- DeviceInfo = (PCI_UART_DEVICE_INFO *)PcdGetPtr (PcdSerialPciDeviceInfo);
-
- //
- // If PCI Device Info is empty, then assume fixed address UART and return PcdSerialRegisterBase
- //
- if (DeviceInfo->Device == 0xff) {
- return (UINTN)PcdGet64 (PcdSerialRegisterBase);
- }
-
- //
- // Assume PCI Bus 0 I/O window is 0-64KB and MMIO windows is 0-4GB
- //
- ParentMemoryBase = 0 >> 16;
- ParentMemoryLimit = 0xfff00000 >> 16;
- ParentIoBase = 0 >> 12;
- ParentIoLimit = 0xf000 >> 12;
-
- //
- // Enable I/O and MMIO in PCI Bridge
- // Assume Root Bus Numer is Zero.
- //
- for (BusNumber = 0; (DeviceInfo + 1)->Device != 0xff; DeviceInfo++) {
- //
- // Compute PCI Lib Address to PCI to PCI Bridge
- //
- PciLibAddress = PCI_LIB_ADDRESS (BusNumber, DeviceInfo->Device, DeviceInfo->Function, 0);
-
- //
- // Retrieve and verify the bus numbers in the PCI to PCI Bridge
- //
- BusNumber = PciRead8 (PciLibAddress + PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET);
- SubordinateBusNumber = PciRead8 (PciLibAddress + PCI_BRIDGE_SUBORDINATE_BUS_REGISTER_OFFSET);
- if ((BusNumber == 0) || (BusNumber > SubordinateBusNumber)) {
- return 0;
- }
-
- //
- // Retrieve and verify the I/O or MMIO decode window in the PCI to PCI Bridge
- //
- if (PcdGetBool (PcdSerialUseMmio)) {
- MemoryLimit = PciRead16 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.MemoryLimit)) & 0xfff0;
- MemoryBase = PciRead16 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.MemoryBase)) & 0xfff0;
-
- //
- // If PCI Bridge MMIO window is disabled, then return 0
- //
- if (MemoryLimit < MemoryBase) {
- return 0;
- }
-
- //
- // If PCI Bridge MMIO window is not in the address range decoded by the parent PCI Bridge, then return 0
- //
- if ((MemoryBase < ParentMemoryBase) || (MemoryBase > ParentMemoryLimit) || (MemoryLimit > ParentMemoryLimit)) {
- return 0;
- }
-
- ParentMemoryBase = MemoryBase;
- ParentMemoryLimit = MemoryLimit;
- } else {
- IoLimit = PciRead8 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.IoLimit));
- if ((IoLimit & PCI_BRIDGE_32_BIT_IO_SPACE) == 0) {
- IoLimit = IoLimit >> 4;
- } else {
- IoLimit = (PciRead16 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.IoLimitUpper16)) << 4) | (IoLimit >> 4);
- }
-
- IoBase = PciRead8 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.IoBase));
- if ((IoBase & PCI_BRIDGE_32_BIT_IO_SPACE) == 0) {
- IoBase = IoBase >> 4;
- } else {
- IoBase = (PciRead16 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.IoBaseUpper16)) << 4) | (IoBase >> 4);
- }
-
- //
- // If PCI Bridge I/O window is disabled, then return 0
- //
- if (IoLimit < IoBase) {
- return 0;
- }
-
- //
- // If PCI Bridge I/O window is not in the address range decoded by the parent PCI Bridge, then return 0
- //
- if ((IoBase < ParentIoBase) || (IoBase > ParentIoLimit) || (IoLimit > ParentIoLimit)) {
- return 0;
- }
-
- ParentIoBase = IoBase;
- ParentIoLimit = IoLimit;
- }
- }
-
- //
- // Compute PCI Lib Address to PCI UART
- //
- PciLibAddress = PCI_LIB_ADDRESS (BusNumber, DeviceInfo->Device, DeviceInfo->Function, 0);
-
- //
- // Find the first IO or MMIO BAR
- //
- RegisterBaseMask = 0xFFFFFFF0;
- for (BarIndex = 0; BarIndex < PCI_MAX_BAR; BarIndex++) {
- SerialRegisterBase = PciRead32 (PciLibAddress + PCI_BASE_ADDRESSREG_OFFSET + BarIndex * 4);
- if (PcdGetBool (PcdSerialUseMmio) && ((SerialRegisterBase & BIT0) == 0)) {
- //
- // MMIO BAR is found
- //
- RegisterBaseMask = 0xFFFFFFF0;
- break;
- }
-
- if ((!PcdGetBool (PcdSerialUseMmio)) && ((SerialRegisterBase & BIT0) != 0)) {
- //
- // IO BAR is found
- //
- RegisterBaseMask = 0xFFFFFFF8;
- break;
- }
- }
-
- //
- // MMIO or IO BAR is not found.
- //
- if (BarIndex == PCI_MAX_BAR) {
- return 0;
- }
-
- //
- // Program UART BAR
- //
- SerialRegisterBase = SerialPortLibUpdatePciRegister32 (
- PciLibAddress + PCI_BASE_ADDRESSREG_OFFSET + BarIndex * 4,
- (UINT32)PcdGet64 (PcdSerialRegisterBase),
- RegisterBaseMask
- );
-
- //
- // Verify that the UART BAR is in the address range decoded by the parent PCI Bridge
- //
- if (PcdGetBool (PcdSerialUseMmio)) {
- if ((((SerialRegisterBase >> 16) & 0xfff0) < ParentMemoryBase) || (((SerialRegisterBase >> 16) & 0xfff0) > ParentMemoryLimit)) {
- return 0;
- }
- } else {
- if (((SerialRegisterBase >> 12) < ParentIoBase) || ((SerialRegisterBase >> 12) > ParentIoLimit)) {
- return 0;
- }
- }
-
- //
- // Enable I/O and MMIO in PCI UART Device if they are not already enabled
- //
- PciOr16 (
- PciLibAddress + PCI_COMMAND_OFFSET,
- PcdGetBool (PcdSerialUseMmio) ? EFI_PCI_COMMAND_MEMORY_SPACE : EFI_PCI_COMMAND_IO_SPACE
- );
-
- //
- // Force D0 state if a Power Management and Status Register is specified
- //
- if (DeviceInfo->PowerManagementStatusAndControlRegister != 0x00) {
- if ((PciRead16 (PciLibAddress + DeviceInfo->PowerManagementStatusAndControlRegister) & (BIT0 | BIT1)) != 0x00) {
- PciAnd16 (PciLibAddress + DeviceInfo->PowerManagementStatusAndControlRegister, (UINT16) ~(BIT0 | BIT1));
- //
- // If PCI UART was not in D0, then make sure FIFOs are enabled, but do not reset FIFOs
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_FCR, (UINT8)(PcdGet8 (PcdSerialFifoControl) & (B_UART_FCR_FIFOE | B_UART_FCR_FIFO64)));
- }
- }
-
- //
- // Get PCI Device Info
- //
- DeviceInfo = (PCI_UART_DEVICE_INFO *)PcdGetPtr (PcdSerialPciDeviceInfo);
-
- //
- // Enable I/O or MMIO in PCI Bridge
- // Assume Root Bus Numer is Zero.
- //
- for (BusNumber = 0; (DeviceInfo + 1)->Device != 0xff; DeviceInfo++) {
- //
- // Compute PCI Lib Address to PCI to PCI Bridge
- //
- PciLibAddress = PCI_LIB_ADDRESS (BusNumber, DeviceInfo->Device, DeviceInfo->Function, 0);
-
- //
- // Enable the I/O or MMIO decode windows in the PCI to PCI Bridge
- //
- PciOr16 (
- PciLibAddress + PCI_COMMAND_OFFSET,
- PcdGetBool (PcdSerialUseMmio) ? EFI_PCI_COMMAND_MEMORY_SPACE : EFI_PCI_COMMAND_IO_SPACE
- );
-
- //
- // Force D0 state if a Power Management and Status Register is specified
- //
- if (DeviceInfo->PowerManagementStatusAndControlRegister != 0x00) {
- if ((PciRead16 (PciLibAddress + DeviceInfo->PowerManagementStatusAndControlRegister) & (BIT0 | BIT1)) != 0x00) {
- PciAnd16 (PciLibAddress + DeviceInfo->PowerManagementStatusAndControlRegister, (UINT16) ~(BIT0 | BIT1));
- }
- }
-
- BusNumber = PciRead8 (PciLibAddress + PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET);
- }
-
- return SerialRegisterBase;
-}
-
-/**
- Return whether the hardware flow control signal allows writing.
-
- @param SerialRegisterBase The base address register of UART device.
-
- @retval TRUE The serial port is writable.
- @retval FALSE The serial port is not writable.
-**/
-BOOLEAN
-SerialPortWritable (
- UINTN SerialRegisterBase
- )
-{
- if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {
- if (PcdGetBool (PcdSerialDetectCable)) {
- //
- // Wait for both DSR and CTS to be set
- // DSR is set if a cable is connected.
- // CTS is set if it is ok to transmit data
- //
- // DSR CTS Description Action
- // === === ======================================== ========
- // 0 0 No cable connected. Wait
- // 0 1 No cable connected. Wait
- // 1 0 Cable connected, but not clear to send. Wait
- // 1 1 Cable connected, and clear to send. Transmit
- //
- return (BOOLEAN)((SerialPortReadRegister (SerialRegisterBase, R_UART_MSR) & (B_UART_MSR_DSR | B_UART_MSR_CTS)) == (B_UART_MSR_DSR | B_UART_MSR_CTS));
- } else {
- //
- // Wait for both DSR and CTS to be set OR for DSR to be clear.
- // DSR is set if a cable is connected.
- // CTS is set if it is ok to transmit data
- //
- // DSR CTS Description Action
- // === === ======================================== ========
- // 0 0 No cable connected. Transmit
- // 0 1 No cable connected. Transmit
- // 1 0 Cable connected, but not clear to send. Wait
- // 1 1 Cable connected, and clar to send. Transmit
- //
- return (BOOLEAN)((SerialPortReadRegister (SerialRegisterBase, R_UART_MSR) & (B_UART_MSR_DSR | B_UART_MSR_CTS)) != (B_UART_MSR_DSR));
- }
- }
-
- return TRUE;
-}
-
-/**
- Initialize the serial device hardware.
-
- If no initialization is required, then return RETURN_SUCCESS.
- If the serial device was successfully initialized, then return RETURN_SUCCESS.
- If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.
-
- @retval RETURN_SUCCESS The serial device was initialized.
- @retval RETURN_DEVICE_ERROR The serial device could not be initialized.
-
-**/
-RETURN_STATUS
-EFIAPI
-SerialPortInitialize (
- VOID
- )
-{
- RETURN_STATUS Status;
- UINTN SerialRegisterBase;
- UINT32 Divisor;
- UINT32 CurrentDivisor;
- BOOLEAN Initialized;
-
- //
- // Perform platform specific initialization required to enable use of the 16550 device
- // at the location specified by PcdSerialUseMmio and PcdSerialRegisterBase.
- //
- Status = PlatformHookSerialPortInitialize ();
- if (RETURN_ERROR (Status)) {
- return Status;
- }
-
- //
- // Calculate divisor for baud generator
- // Ref_Clk_Rate / Baud_Rate / 16
- //
- Divisor = PcdGet32 (PcdSerialClockRate) / (PcdGet32 (PcdSerialBaudRate) * 16);
- if ((PcdGet32 (PcdSerialClockRate) % (PcdGet32 (PcdSerialBaudRate) * 16)) >= PcdGet32 (PcdSerialBaudRate) * 8) {
- Divisor++;
- }
-
- //
- // Get the base address of the serial port in either I/O or MMIO space
- //
- SerialRegisterBase = GetSerialRegisterBase ();
- if (SerialRegisterBase == 0) {
- return RETURN_DEVICE_ERROR;
- }
-
- //
- // See if the serial port is already initialized
- //
- Initialized = TRUE;
- if ((SerialPortReadRegister (SerialRegisterBase, R_UART_LCR) & 0x3F) != (PcdGet8 (PcdSerialLineControl) & 0x3F)) {
- Initialized = FALSE;
- }
-
- SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_LCR) | B_UART_LCR_DLAB));
- CurrentDivisor = SerialPortReadRegister (SerialRegisterBase, R_UART_BAUD_HIGH) << 8;
- CurrentDivisor |= (UINT32)SerialPortReadRegister (SerialRegisterBase, R_UART_BAUD_LOW);
- SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_LCR) & ~B_UART_LCR_DLAB));
- if (CurrentDivisor != Divisor) {
- Initialized = FALSE;
- }
-
- if (Initialized) {
- return RETURN_SUCCESS;
- }
-
- //
- // Wait for the serial port to be ready.
- // Verify that both the transmit FIFO and the shift register are empty.
- //
- while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) != (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) {
- }
-
- //
- // Configure baud rate
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, B_UART_LCR_DLAB);
- SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_HIGH, (UINT8)(Divisor >> 8));
- SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_LOW, (UINT8)(Divisor & 0xff));
-
- //
- // Clear DLAB and configure Data Bits, Parity, and Stop Bits.
- // Strip reserved bits from PcdSerialLineControl
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8)(PcdGet8 (PcdSerialLineControl) & 0x3F));
-
- //
- // Enable and reset FIFOs
- // Strip reserved bits from PcdSerialFifoControl
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_FCR, 0x00);
- SerialPortWriteRegister (SerialRegisterBase, R_UART_FCR, (UINT8)(PcdGet8 (PcdSerialFifoControl) & (B_UART_FCR_FIFOE | B_UART_FCR_FIFO64)));
-
- //
- // Set FIFO Polled Mode by clearing IER after setting FCR
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_IER, 0x00);
-
- //
- // Put Modem Control Register(MCR) into its reset state of 0x00.
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, 0x00);
-
- return RETURN_SUCCESS;
-}
-
-/**
- Write data from buffer to serial device.
-
- Writes NumberOfBytes data bytes from Buffer to the serial device.
- The number of bytes actually written to the serial device is returned.
- If the return value is less than NumberOfBytes, then the write operation failed.
-
- If Buffer is NULL, then ASSERT().
-
- If NumberOfBytes is zero, then return 0.
-
- @param Buffer Pointer to the data buffer to be written.
- @param NumberOfBytes Number of bytes to written to the serial device.
-
- @retval 0 NumberOfBytes is 0.
- @retval >0 The number of bytes written to the serial device.
- If this value is less than NumberOfBytes, then the write operation failed.
-
-**/
-UINTN
-EFIAPI
-SerialPortWrite (
- IN UINT8 *Buffer,
- IN UINTN NumberOfBytes
- )
-{
- UINTN SerialRegisterBase;
- UINTN Result;
- UINTN Index;
- UINTN FifoSize;
-
- if (Buffer == NULL) {
- return 0;
- }
-
- SerialRegisterBase = GetSerialRegisterBase ();
- if (SerialRegisterBase == 0) {
- return 0;
- }
-
- if (NumberOfBytes == 0) {
- //
- // Flush the hardware
- //
-
- //
- // Wait for both the transmit FIFO and shift register empty.
- //
- while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) != (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) {
- }
-
- //
- // Wait for the hardware flow control signal
- //
- while (!SerialPortWritable (SerialRegisterBase)) {
- }
-
- return 0;
- }
-
- //
- // Compute the maximum size of the Tx FIFO
- //
- FifoSize = 1;
- if ((PcdGet8 (PcdSerialFifoControl) & B_UART_FCR_FIFOE) != 0) {
- if ((PcdGet8 (PcdSerialFifoControl) & B_UART_FCR_FIFO64) == 0) {
- FifoSize = 16;
- } else {
- FifoSize = PcdGet32 (PcdSerialExtendedTxFifoSize);
- }
- }
-
- Result = NumberOfBytes;
- while (NumberOfBytes != 0) {
- //
- // Wait for the serial port to be ready, to make sure both the transmit FIFO
- // and shift register empty.
- //
- while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) != (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) {
- }
-
- //
- // Fill then entire Tx FIFO
- //
- for (Index = 0; Index < FifoSize && NumberOfBytes != 0; Index++, NumberOfBytes--, Buffer++) {
- //
- // Wait for the hardware flow control signal
- //
- while (!SerialPortWritable (SerialRegisterBase)) {
- }
-
- //
- // Write byte to the transmit buffer.
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_TXBUF, *Buffer);
- }
- }
-
- return Result;
-}
-
-/**
- Reads data from a serial device into a buffer.
-
- @param Buffer Pointer to the data buffer to store the data read from the serial device.
- @param NumberOfBytes Number of bytes to read from the serial device.
-
- @retval 0 NumberOfBytes is 0.
- @retval >0 The number of bytes read from the serial device.
- If this value is less than NumberOfBytes, then the read operation failed.
-
-**/
-UINTN
-EFIAPI
-SerialPortRead (
- OUT UINT8 *Buffer,
- IN UINTN NumberOfBytes
- )
-{
- UINTN SerialRegisterBase;
- UINTN Result;
- UINT8 Mcr;
-
- if (NULL == Buffer) {
- return 0;
- }
-
- SerialRegisterBase = GetSerialRegisterBase ();
- if (SerialRegisterBase == 0) {
- return 0;
- }
-
- Mcr = (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_MCR) & ~B_UART_MCR_RTS);
-
- for (Result = 0; NumberOfBytes-- != 0; Result++, Buffer++) {
- //
- // Wait for the serial port to have some data.
- //
- while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & B_UART_LSR_RXRDY) == 0) {
- if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {
- //
- // Set RTS to let the peer send some data
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, (UINT8)(Mcr | B_UART_MCR_RTS));
- }
- }
-
- if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {
- //
- // Clear RTS to prevent peer from sending data
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, Mcr);
- }
-
- //
- // Read byte from the receive buffer.
- //
- *Buffer = SerialPortReadRegister (SerialRegisterBase, R_UART_RXBUF);
- }
-
- return Result;
-}
-
-/**
- Polls a serial device to see if there is any data waiting to be read.
-
- Polls aserial device to see if there is any data waiting to be read.
- If there is data waiting to be read from the serial device, then TRUE is returned.
- If there is no data waiting to be read from the serial device, then FALSE is returned.
-
- @retval TRUE Data is waiting to be read from the serial device.
- @retval FALSE There is no data waiting to be read from the serial device.
-
-**/
-BOOLEAN
-EFIAPI
-SerialPortPoll (
- VOID
- )
-{
- UINTN SerialRegisterBase;
-
- SerialRegisterBase = GetSerialRegisterBase ();
- if (SerialRegisterBase == 0) {
- return FALSE;
- }
-
- //
- // Read the serial port status
- //
- if ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & B_UART_LSR_RXRDY) != 0) {
- if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {
- //
- // Clear RTS to prevent peer from sending data
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_MCR) & ~B_UART_MCR_RTS));
- }
-
- return TRUE;
- }
-
- if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {
- //
- // Set RTS to let the peer send some data
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_MCR) | B_UART_MCR_RTS));
- }
-
- return FALSE;
-}
-
-/**
- Sets the control bits on a serial device.
-
- @param Control Sets the bits of Control that are settable.
-
- @retval RETURN_SUCCESS The new control bits were set on the serial device.
- @retval RETURN_UNSUPPORTED The serial device does not support this operation.
- @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
-
-**/
-RETURN_STATUS
-EFIAPI
-SerialPortSetControl (
- IN UINT32 Control
- )
-{
- UINTN SerialRegisterBase;
- UINT8 Mcr;
-
- //
- // First determine the parameter is invalid.
- //
- if ((Control & (~(EFI_SERIAL_REQUEST_TO_SEND | EFI_SERIAL_DATA_TERMINAL_READY |
- EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE))) != 0)
- {
- return RETURN_UNSUPPORTED;
- }
-
- SerialRegisterBase = GetSerialRegisterBase ();
- if (SerialRegisterBase == 0) {
- return RETURN_UNSUPPORTED;
- }
-
- //
- // Read the Modem Control Register.
- //
- Mcr = SerialPortReadRegister (SerialRegisterBase, R_UART_MCR);
- Mcr &= (~(B_UART_MCR_DTRC | B_UART_MCR_RTS));
-
- if ((Control & EFI_SERIAL_DATA_TERMINAL_READY) == EFI_SERIAL_DATA_TERMINAL_READY) {
- Mcr |= B_UART_MCR_DTRC;
- }
-
- if ((Control & EFI_SERIAL_REQUEST_TO_SEND) == EFI_SERIAL_REQUEST_TO_SEND) {
- Mcr |= B_UART_MCR_RTS;
- }
-
- //
- // Write the Modem Control Register.
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, Mcr);
-
- return RETURN_SUCCESS;
-}
-
-/**
- Retrieve the status of the control bits on a serial device.
-
- @param Control A pointer to return the current control signals from the serial device.
-
- @retval RETURN_SUCCESS The control bits were read from the serial device.
- @retval RETURN_UNSUPPORTED The serial device does not support this operation.
- @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
-
-**/
-RETURN_STATUS
-EFIAPI
-SerialPortGetControl (
- OUT UINT32 *Control
- )
-{
- UINTN SerialRegisterBase;
- UINT8 Msr;
- UINT8 Mcr;
- UINT8 Lsr;
-
- SerialRegisterBase = GetSerialRegisterBase ();
- if (SerialRegisterBase == 0) {
- return RETURN_UNSUPPORTED;
- }
-
- *Control = 0;
-
- //
- // Read the Modem Status Register.
- //
- Msr = SerialPortReadRegister (SerialRegisterBase, R_UART_MSR);
-
- if ((Msr & B_UART_MSR_CTS) == B_UART_MSR_CTS) {
- *Control |= EFI_SERIAL_CLEAR_TO_SEND;
- }
-
- if ((Msr & B_UART_MSR_DSR) == B_UART_MSR_DSR) {
- *Control |= EFI_SERIAL_DATA_SET_READY;
- }
-
- if ((Msr & B_UART_MSR_RI) == B_UART_MSR_RI) {
- *Control |= EFI_SERIAL_RING_INDICATE;
- }
-
- if ((Msr & B_UART_MSR_DCD) == B_UART_MSR_DCD) {
- *Control |= EFI_SERIAL_CARRIER_DETECT;
- }
-
- //
- // Read the Modem Control Register.
- //
- Mcr = SerialPortReadRegister (SerialRegisterBase, R_UART_MCR);
-
- if ((Mcr & B_UART_MCR_DTRC) == B_UART_MCR_DTRC) {
- *Control |= EFI_SERIAL_DATA_TERMINAL_READY;
- }
-
- if ((Mcr & B_UART_MCR_RTS) == B_UART_MCR_RTS) {
- *Control |= EFI_SERIAL_REQUEST_TO_SEND;
- }
-
- if (PcdGetBool (PcdSerialUseHardwareFlowControl)) {
- *Control |= EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE;
- }
-
- //
- // Read the Line Status Register.
- //
- Lsr = SerialPortReadRegister (SerialRegisterBase, R_UART_LSR);
-
- if ((Lsr & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) == (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) {
- *Control |= EFI_SERIAL_OUTPUT_BUFFER_EMPTY;
- }
-
- if ((Lsr & B_UART_LSR_RXRDY) == 0) {
- *Control |= EFI_SERIAL_INPUT_BUFFER_EMPTY;
- }
-
- return RETURN_SUCCESS;
-}
-
-/**
- Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
- data bits, and stop bits on a serial device.
-
- @param BaudRate The requested baud rate. A BaudRate value of 0 will use the
- device's default interface speed.
- On output, the value actually set.
- @param ReveiveFifoDepth The requested depth of the FIFO on the receive side of the
- serial interface. A ReceiveFifoDepth value of 0 will use
- the device's default FIFO depth.
- On output, the value actually set.
- @param Timeout The requested time out for a single character in microseconds.
- This timeout applies to both the transmit and receive side of the
- interface. A Timeout value of 0 will use the device's default time
- out value.
- On output, the value actually set.
- @param Parity The type of parity to use on this serial device. A Parity value of
- DefaultParity will use the device's default parity value.
- On output, the value actually set.
- @param DataBits The number of data bits to use on the serial device. A DataBits
- vaule of 0 will use the device's default data bit setting.
- On output, the value actually set.
- @param StopBits The number of stop bits to use on this serial device. A StopBits
- value of DefaultStopBits will use the device's default number of
- stop bits.
- On output, the value actually set.
-
- @retval RETURN_SUCCESS The new attributes were set on the serial device.
- @retval RETURN_UNSUPPORTED The serial device does not support this operation.
- @retval RETURN_INVALID_PARAMETER One or more of the attributes has an unsupported value.
- @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
-
-**/
-RETURN_STATUS
-EFIAPI
-SerialPortSetAttributes (
- IN OUT UINT64 *BaudRate,
- IN OUT UINT32 *ReceiveFifoDepth,
- IN OUT UINT32 *Timeout,
- IN OUT EFI_PARITY_TYPE *Parity,
- IN OUT UINT8 *DataBits,
- IN OUT EFI_STOP_BITS_TYPE *StopBits
- )
-{
- UINTN SerialRegisterBase;
- UINT32 SerialBaudRate;
- UINTN Divisor;
- UINT8 Lcr;
- UINT8 LcrData;
- UINT8 LcrParity;
- UINT8 LcrStop;
-
- SerialRegisterBase = GetSerialRegisterBase ();
- if (SerialRegisterBase == 0) {
- return RETURN_UNSUPPORTED;
- }
-
- //
- // Check for default settings and fill in actual values.
- //
- if (*BaudRate == 0) {
- *BaudRate = PcdGet32 (PcdSerialBaudRate);
- }
-
- SerialBaudRate = (UINT32)*BaudRate;
-
- if (*DataBits == 0) {
- LcrData = (UINT8)(PcdGet8 (PcdSerialLineControl) & 0x3);
- *DataBits = LcrData + 5;
- } else {
- if ((*DataBits < 5) || (*DataBits > 8)) {
- return RETURN_INVALID_PARAMETER;
- }
-
- //
- // Map 5..8 to 0..3
- //
- LcrData = (UINT8)(*DataBits - (UINT8)5);
- }
-
- if (*Parity == DefaultParity) {
- LcrParity = (UINT8)((PcdGet8 (PcdSerialLineControl) >> 3) & 0x7);
- switch (LcrParity) {
- case 0:
- *Parity = NoParity;
- break;
-
- case 3:
- *Parity = EvenParity;
- break;
-
- case 1:
- *Parity = OddParity;
- break;
-
- case 7:
- *Parity = SpaceParity;
- break;
-
- case 5:
- *Parity = MarkParity;
- break;
-
- default:
- break;
- }
- } else {
- switch (*Parity) {
- case NoParity:
- LcrParity = 0;
- break;
-
- case EvenParity:
- LcrParity = 3;
- break;
-
- case OddParity:
- LcrParity = 1;
- break;
-
- case SpaceParity:
- LcrParity = 7;
- break;
-
- case MarkParity:
- LcrParity = 5;
- break;
-
- default:
- return RETURN_INVALID_PARAMETER;
- }
- }
-
- if (*StopBits == DefaultStopBits) {
- LcrStop = (UINT8)((PcdGet8 (PcdSerialLineControl) >> 2) & 0x1);
- switch (LcrStop) {
- case 0:
- *StopBits = OneStopBit;
- break;
-
- case 1:
- if (*DataBits == 5) {
- *StopBits = OneFiveStopBits;
- } else {
- *StopBits = TwoStopBits;
- }
-
- break;
-
- default:
- break;
- }
- } else {
- switch (*StopBits) {
- case OneStopBit:
- LcrStop = 0;
- break;
-
- case OneFiveStopBits:
- case TwoStopBits:
- LcrStop = 1;
- break;
-
- default:
- return RETURN_INVALID_PARAMETER;
- }
- }
-
- //
- // Calculate divisor for baud generator
- // Ref_Clk_Rate / Baud_Rate / 16
- //
- Divisor = PcdGet32 (PcdSerialClockRate) / (SerialBaudRate * 16);
- if ((PcdGet32 (PcdSerialClockRate) % (SerialBaudRate * 16)) >= SerialBaudRate * 8) {
- Divisor++;
- }
-
- //
- // Configure baud rate
- //
- SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, B_UART_LCR_DLAB);
- SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_HIGH, (UINT8)(Divisor >> 8));
- SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_LOW, (UINT8)(Divisor & 0xff));
-
- //
- // Clear DLAB and configure Data Bits, Parity, and Stop Bits.
- // Strip reserved bits from line control value
- //
- Lcr = (UINT8)((LcrParity << 3) | (LcrStop << 2) | LcrData);
- SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8)(Lcr & 0x3F));
-
- return RETURN_SUCCESS;
-}
-
-/** Base Serial Port 16550 Library Constructor
-
- @retval RETURN_SUCCESS Success.
-**/
-EFI_STATUS
-EFIAPI
-BaseSerialPortLib16550 (
- VOID
- )
-{
- // Nothing to do here. This constructor is added to
- // enable the chain of constructor invocation for
- // dependent libraries.
- return RETURN_SUCCESS;
-}
+/** @file + 16550 UART Serial Port library functions + + (C) Copyright 2014 Hewlett-Packard Development Company, L.P.<BR> + Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR> + Copyright (c) 2018, AMD Incorporated. All rights reserved.<BR> + Copyright (c) 2020, ARM Limited. All rights reserved. + + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +#include <Base.h> +#include <IndustryStandard/Pci.h> +#include <Library/SerialPortLib.h> +#include <Library/PcdLib.h> +#include <Library/IoLib.h> +#include <Library/PciLib.h> +#include <Library/PlatformHookLib.h> +#include <Library/BaseLib.h> + +// +// PCI Defintions. +// +#define PCI_BRIDGE_32_BIT_IO_SPACE 0x01 + +// +// 16550 UART register offsets and bitfields +// +#define R_UART_RXBUF 0 // LCR_DLAB = 0 +#define R_UART_TXBUF 0 // LCR_DLAB = 0 +#define R_UART_BAUD_LOW 0 // LCR_DLAB = 1 +#define R_UART_BAUD_HIGH 1 // LCR_DLAB = 1 +#define R_UART_IER 1 // LCR_DLAB = 0 +#define R_UART_FCR 2 +#define B_UART_FCR_FIFOE BIT0 +#define B_UART_FCR_FIFO64 BIT5 +#define R_UART_LCR 3 +#define B_UART_LCR_DLAB BIT7 +#define R_UART_MCR 4 +#define B_UART_MCR_DTRC BIT0 +#define B_UART_MCR_RTS BIT1 +#define R_UART_LSR 5 +#define B_UART_LSR_RXRDY BIT0 +#define B_UART_LSR_TXRDY BIT5 +#define B_UART_LSR_TEMT BIT6 +#define R_UART_MSR 6 +#define B_UART_MSR_CTS BIT4 +#define B_UART_MSR_DSR BIT5 +#define B_UART_MSR_RI BIT6 +#define B_UART_MSR_DCD BIT7 + +// +// 4-byte structure for each PCI node in PcdSerialPciDeviceInfo +// +typedef struct { + UINT8 Device; + UINT8 Function; + UINT16 PowerManagementStatusAndControlRegister; +} PCI_UART_DEVICE_INFO; + +/** + Read an 8-bit 16550 register. If PcdSerialUseMmio is TRUE, then the value is read from + MMIO space. If PcdSerialUseMmio is FALSE, then the value is read from I/O space. The + parameter Offset is added to the base address of the 16550 registers that is specified + by PcdSerialRegisterBase. PcdSerialRegisterAccessWidth specifies the MMIO space access + width and defaults to 8 bit access, and supports 8 or 32 bit access. + + @param Base The base address register of UART device. + @param Offset The offset of the 16550 register to read. + + @return The value read from the 16550 register. + +**/ +UINT8 +SerialPortReadRegister ( + UINTN Base, + UINTN Offset + ) +{ + if (PcdGetBool (PcdSerialUseMmio)) { + if (PcdGet8 (PcdSerialRegisterAccessWidth) == 32) { + return (UINT8)MmioRead32 (Base + Offset * PcdGet32 (PcdSerialRegisterStride)); + } + + return MmioRead8 (Base + Offset * PcdGet32 (PcdSerialRegisterStride)); + } else { + return IoRead8 (Base + Offset * PcdGet32 (PcdSerialRegisterStride)); + } +} + +/** + Write an 8-bit 16550 register. If PcdSerialUseMmio is TRUE, then the value is written to + MMIO space. If PcdSerialUseMmio is FALSE, then the value is written to I/O space. The + parameter Offset is added to the base address of the 16550 registers that is specified + by PcdSerialRegisterBase. PcdSerialRegisterAccessWidth specifies the MMIO space access + width and defaults to 8 bit access, and supports 8 or 32 bit access. + + @param Base The base address register of UART device. + @param Offset The offset of the 16550 register to write. + @param Value The value to write to the 16550 register specified by Offset. + + @return The value written to the 16550 register. + +**/ +UINT8 +SerialPortWriteRegister ( + UINTN Base, + UINTN Offset, + UINT8 Value + ) +{ + if (PcdGetBool (PcdSerialUseMmio)) { + if (PcdGet8 (PcdSerialRegisterAccessWidth) == 32) { + return (UINT8)MmioWrite32 (Base + Offset * PcdGet32 (PcdSerialRegisterStride), (UINT8)Value); + } + + return MmioWrite8 (Base + Offset * PcdGet32 (PcdSerialRegisterStride), Value); + } else { + return IoWrite8 (Base + Offset * PcdGet32 (PcdSerialRegisterStride), Value); + } +} + +/** + Update the value of an 16-bit PCI configuration register in a PCI device. If the + PCI Configuration register specified by PciAddress is already programmed with a + non-zero value, then return the current value. Otherwise update the PCI configuration + register specified by PciAddress with the value specified by Value and return the + value programmed into the PCI configuration register. All values must be masked + using the bitmask specified by Mask. + + @param PciAddress PCI Library address of the PCI Configuration register to update. + @param Value The value to program into the PCI Configuration Register. + @param Mask Bitmask of the bits to check and update in the PCI configuration register. + +**/ +UINT16 +SerialPortLibUpdatePciRegister16 ( + UINTN PciAddress, + UINT16 Value, + UINT16 Mask + ) +{ + UINT16 CurrentValue; + + CurrentValue = PciRead16 (PciAddress) & Mask; + if (CurrentValue != 0) { + return CurrentValue; + } + + return PciWrite16 (PciAddress, Value & Mask); +} + +/** + Update the value of an 32-bit PCI configuration register in a PCI device. If the + PCI Configuration register specified by PciAddress is already programmed with a + non-zero value, then return the current value. Otherwise update the PCI configuration + register specified by PciAddress with the value specified by Value and return the + value programmed into the PCI configuration register. All values must be masked + using the bitmask specified by Mask. + + @param PciAddress PCI Library address of the PCI Configuration register to update. + @param Value The value to program into the PCI Configuration Register. + @param Mask Bitmask of the bits to check and update in the PCI configuration register. + + @return The Secondary bus number that is actually programed into the PCI to PCI Bridge device. + +**/ +UINT32 +SerialPortLibUpdatePciRegister32 ( + UINTN PciAddress, + UINT32 Value, + UINT32 Mask + ) +{ + UINT32 CurrentValue; + + CurrentValue = PciRead32 (PciAddress) & Mask; + if (CurrentValue != 0) { + return CurrentValue; + } + + return PciWrite32 (PciAddress, Value & Mask); +} + +/** + Retrieve the I/O or MMIO base address register for the PCI UART device. + + This function assumes Root Bus Numer is Zero, and enables I/O and MMIO in PCI UART + Device if they are not already enabled. + + @return The base address register of the UART device. + +**/ +UINTN +GetSerialRegisterBase ( + VOID + ) +{ + UINTN PciLibAddress; + UINTN BusNumber; + UINTN SubordinateBusNumber; + UINT32 ParentIoBase; + UINT32 ParentIoLimit; + UINT16 ParentMemoryBase; + UINT16 ParentMemoryLimit; + UINT32 IoBase; + UINT32 IoLimit; + UINT16 MemoryBase; + UINT16 MemoryLimit; + UINTN SerialRegisterBase; + UINTN BarIndex; + UINT32 RegisterBaseMask; + PCI_UART_DEVICE_INFO *DeviceInfo; + + // + // Get PCI Device Info + // + DeviceInfo = (PCI_UART_DEVICE_INFO *)PcdGetPtr (PcdSerialPciDeviceInfo); + + // + // If PCI Device Info is empty, then assume fixed address UART and return PcdSerialRegisterBase + // + if (DeviceInfo->Device == 0xff) { + return (UINTN)PcdGet64 (PcdSerialRegisterBase); + } + + // + // Assume PCI Bus 0 I/O window is 0-64KB and MMIO windows is 0-4GB + // + ParentMemoryBase = 0 >> 16; + ParentMemoryLimit = 0xfff00000 >> 16; + ParentIoBase = 0 >> 12; + ParentIoLimit = 0xf000 >> 12; + + // + // Enable I/O and MMIO in PCI Bridge + // Assume Root Bus Numer is Zero. + // + for (BusNumber = 0; (DeviceInfo + 1)->Device != 0xff; DeviceInfo++) { + // + // Compute PCI Lib Address to PCI to PCI Bridge + // + PciLibAddress = PCI_LIB_ADDRESS (BusNumber, DeviceInfo->Device, DeviceInfo->Function, 0); + + // + // Retrieve and verify the bus numbers in the PCI to PCI Bridge + // + BusNumber = PciRead8 (PciLibAddress + PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET); + SubordinateBusNumber = PciRead8 (PciLibAddress + PCI_BRIDGE_SUBORDINATE_BUS_REGISTER_OFFSET); + if ((BusNumber == 0) || (BusNumber > SubordinateBusNumber)) { + return 0; + } + + // + // Retrieve and verify the I/O or MMIO decode window in the PCI to PCI Bridge + // + if (PcdGetBool (PcdSerialUseMmio)) { + MemoryLimit = PciRead16 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.MemoryLimit)) & 0xfff0; + MemoryBase = PciRead16 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.MemoryBase)) & 0xfff0; + + // + // If PCI Bridge MMIO window is disabled, then return 0 + // + if (MemoryLimit < MemoryBase) { + return 0; + } + + // + // If PCI Bridge MMIO window is not in the address range decoded by the parent PCI Bridge, then return 0 + // + if ((MemoryBase < ParentMemoryBase) || (MemoryBase > ParentMemoryLimit) || (MemoryLimit > ParentMemoryLimit)) { + return 0; + } + + ParentMemoryBase = MemoryBase; + ParentMemoryLimit = MemoryLimit; + } else { + IoLimit = PciRead8 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.IoLimit)); + if ((IoLimit & PCI_BRIDGE_32_BIT_IO_SPACE) == 0) { + IoLimit = IoLimit >> 4; + } else { + IoLimit = (PciRead16 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.IoLimitUpper16)) << 4) | (IoLimit >> 4); + } + + IoBase = PciRead8 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.IoBase)); + if ((IoBase & PCI_BRIDGE_32_BIT_IO_SPACE) == 0) { + IoBase = IoBase >> 4; + } else { + IoBase = (PciRead16 (PciLibAddress + OFFSET_OF (PCI_TYPE01, Bridge.IoBaseUpper16)) << 4) | (IoBase >> 4); + } + + // + // If PCI Bridge I/O window is disabled, then return 0 + // + if (IoLimit < IoBase) { + return 0; + } + + // + // If PCI Bridge I/O window is not in the address range decoded by the parent PCI Bridge, then return 0 + // + if ((IoBase < ParentIoBase) || (IoBase > ParentIoLimit) || (IoLimit > ParentIoLimit)) { + return 0; + } + + ParentIoBase = IoBase; + ParentIoLimit = IoLimit; + } + } + + // + // Compute PCI Lib Address to PCI UART + // + PciLibAddress = PCI_LIB_ADDRESS (BusNumber, DeviceInfo->Device, DeviceInfo->Function, 0); + + // + // Find the first IO or MMIO BAR + // + RegisterBaseMask = 0xFFFFFFF0; + for (BarIndex = 0; BarIndex < PCI_MAX_BAR; BarIndex++) { + SerialRegisterBase = PciRead32 (PciLibAddress + PCI_BASE_ADDRESSREG_OFFSET + BarIndex * 4); + if (PcdGetBool (PcdSerialUseMmio) && ((SerialRegisterBase & BIT0) == 0)) { + // + // MMIO BAR is found + // + RegisterBaseMask = 0xFFFFFFF0; + break; + } + + if ((!PcdGetBool (PcdSerialUseMmio)) && ((SerialRegisterBase & BIT0) != 0)) { + // + // IO BAR is found + // + RegisterBaseMask = 0xFFFFFFF8; + break; + } + } + + // + // MMIO or IO BAR is not found. + // + if (BarIndex == PCI_MAX_BAR) { + return 0; + } + + // + // Program UART BAR + // + SerialRegisterBase = SerialPortLibUpdatePciRegister32 ( + PciLibAddress + PCI_BASE_ADDRESSREG_OFFSET + BarIndex * 4, + (UINT32)PcdGet64 (PcdSerialRegisterBase), + RegisterBaseMask + ); + + // + // Verify that the UART BAR is in the address range decoded by the parent PCI Bridge + // + if (PcdGetBool (PcdSerialUseMmio)) { + if ((((SerialRegisterBase >> 16) & 0xfff0) < ParentMemoryBase) || (((SerialRegisterBase >> 16) & 0xfff0) > ParentMemoryLimit)) { + return 0; + } + } else { + if (((SerialRegisterBase >> 12) < ParentIoBase) || ((SerialRegisterBase >> 12) > ParentIoLimit)) { + return 0; + } + } + + // + // Enable I/O and MMIO in PCI UART Device if they are not already enabled + // + PciOr16 ( + PciLibAddress + PCI_COMMAND_OFFSET, + PcdGetBool (PcdSerialUseMmio) ? EFI_PCI_COMMAND_MEMORY_SPACE : EFI_PCI_COMMAND_IO_SPACE + ); + + // + // Force D0 state if a Power Management and Status Register is specified + // + if (DeviceInfo->PowerManagementStatusAndControlRegister != 0x00) { + if ((PciRead16 (PciLibAddress + DeviceInfo->PowerManagementStatusAndControlRegister) & (BIT0 | BIT1)) != 0x00) { + PciAnd16 (PciLibAddress + DeviceInfo->PowerManagementStatusAndControlRegister, (UINT16) ~(BIT0 | BIT1)); + // + // If PCI UART was not in D0, then make sure FIFOs are enabled, but do not reset FIFOs + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_FCR, (UINT8)(PcdGet8 (PcdSerialFifoControl) & (B_UART_FCR_FIFOE | B_UART_FCR_FIFO64))); + } + } + + // + // Get PCI Device Info + // + DeviceInfo = (PCI_UART_DEVICE_INFO *)PcdGetPtr (PcdSerialPciDeviceInfo); + + // + // Enable I/O or MMIO in PCI Bridge + // Assume Root Bus Numer is Zero. + // + for (BusNumber = 0; (DeviceInfo + 1)->Device != 0xff; DeviceInfo++) { + // + // Compute PCI Lib Address to PCI to PCI Bridge + // + PciLibAddress = PCI_LIB_ADDRESS (BusNumber, DeviceInfo->Device, DeviceInfo->Function, 0); + + // + // Enable the I/O or MMIO decode windows in the PCI to PCI Bridge + // + PciOr16 ( + PciLibAddress + PCI_COMMAND_OFFSET, + PcdGetBool (PcdSerialUseMmio) ? EFI_PCI_COMMAND_MEMORY_SPACE : EFI_PCI_COMMAND_IO_SPACE + ); + + // + // Force D0 state if a Power Management and Status Register is specified + // + if (DeviceInfo->PowerManagementStatusAndControlRegister != 0x00) { + if ((PciRead16 (PciLibAddress + DeviceInfo->PowerManagementStatusAndControlRegister) & (BIT0 | BIT1)) != 0x00) { + PciAnd16 (PciLibAddress + DeviceInfo->PowerManagementStatusAndControlRegister, (UINT16) ~(BIT0 | BIT1)); + } + } + + BusNumber = PciRead8 (PciLibAddress + PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET); + } + + return SerialRegisterBase; +} + +/** + Return whether the hardware flow control signal allows writing. + + @param SerialRegisterBase The base address register of UART device. + + @retval TRUE The serial port is writable. + @retval FALSE The serial port is not writable. +**/ +BOOLEAN +SerialPortWritable ( + UINTN SerialRegisterBase + ) +{ + if (PcdGetBool (PcdSerialUseHardwareFlowControl)) { + if (PcdGetBool (PcdSerialDetectCable)) { + // + // Wait for both DSR and CTS to be set + // DSR is set if a cable is connected. + // CTS is set if it is ok to transmit data + // + // DSR CTS Description Action + // === === ======================================== ======== + // 0 0 No cable connected. Wait + // 0 1 No cable connected. Wait + // 1 0 Cable connected, but not clear to send. Wait + // 1 1 Cable connected, and clear to send. Transmit + // + return (BOOLEAN)((SerialPortReadRegister (SerialRegisterBase, R_UART_MSR) & (B_UART_MSR_DSR | B_UART_MSR_CTS)) == (B_UART_MSR_DSR | B_UART_MSR_CTS)); + } else { + // + // Wait for both DSR and CTS to be set OR for DSR to be clear. + // DSR is set if a cable is connected. + // CTS is set if it is ok to transmit data + // + // DSR CTS Description Action + // === === ======================================== ======== + // 0 0 No cable connected. Transmit + // 0 1 No cable connected. Transmit + // 1 0 Cable connected, but not clear to send. Wait + // 1 1 Cable connected, and clar to send. Transmit + // + return (BOOLEAN)((SerialPortReadRegister (SerialRegisterBase, R_UART_MSR) & (B_UART_MSR_DSR | B_UART_MSR_CTS)) != (B_UART_MSR_DSR)); + } + } + + return TRUE; +} + +/** + Initialize the serial device hardware. + + If no initialization is required, then return RETURN_SUCCESS. + If the serial device was successfully initialized, then return RETURN_SUCCESS. + If the serial device could not be initialized, then return RETURN_DEVICE_ERROR. + + @retval RETURN_SUCCESS The serial device was initialized. + @retval RETURN_DEVICE_ERROR The serial device could not be initialized. + +**/ +RETURN_STATUS +EFIAPI +SerialPortInitialize ( + VOID + ) +{ + RETURN_STATUS Status; + UINTN SerialRegisterBase; + UINT32 Divisor; + UINT32 CurrentDivisor; + BOOLEAN Initialized; + + // + // Perform platform specific initialization required to enable use of the 16550 device + // at the location specified by PcdSerialUseMmio and PcdSerialRegisterBase. + // + Status = PlatformHookSerialPortInitialize (); + if (RETURN_ERROR (Status)) { + return Status; + } + + // + // Calculate divisor for baud generator + // Ref_Clk_Rate / Baud_Rate / 16 + // + Divisor = PcdGet32 (PcdSerialClockRate) / (PcdGet32 (PcdSerialBaudRate) * 16); + if ((PcdGet32 (PcdSerialClockRate) % (PcdGet32 (PcdSerialBaudRate) * 16)) >= PcdGet32 (PcdSerialBaudRate) * 8) { + Divisor++; + } + + // + // Get the base address of the serial port in either I/O or MMIO space + // + SerialRegisterBase = GetSerialRegisterBase (); + if (SerialRegisterBase == 0) { + return RETURN_DEVICE_ERROR; + } + + // + // See if the serial port is already initialized + // + Initialized = TRUE; + if ((SerialPortReadRegister (SerialRegisterBase, R_UART_LCR) & 0x3F) != (PcdGet8 (PcdSerialLineControl) & 0x3F)) { + Initialized = FALSE; + } + + SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_LCR) | B_UART_LCR_DLAB)); + CurrentDivisor = SerialPortReadRegister (SerialRegisterBase, R_UART_BAUD_HIGH) << 8; + CurrentDivisor |= (UINT32)SerialPortReadRegister (SerialRegisterBase, R_UART_BAUD_LOW); + SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_LCR) & ~B_UART_LCR_DLAB)); + if (CurrentDivisor != Divisor) { + Initialized = FALSE; + } + + if (Initialized) { + return RETURN_SUCCESS; + } + + // + // Wait for the serial port to be ready. + // Verify that both the transmit FIFO and the shift register are empty. + // + while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) != (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) { + } + + // + // Configure baud rate + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, B_UART_LCR_DLAB); + SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_HIGH, (UINT8)(Divisor >> 8)); + SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_LOW, (UINT8)(Divisor & 0xff)); + + // + // Clear DLAB and configure Data Bits, Parity, and Stop Bits. + // Strip reserved bits from PcdSerialLineControl + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8)(PcdGet8 (PcdSerialLineControl) & 0x3F)); + + // + // Enable and reset FIFOs + // Strip reserved bits from PcdSerialFifoControl + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_FCR, 0x00); + SerialPortWriteRegister (SerialRegisterBase, R_UART_FCR, (UINT8)(PcdGet8 (PcdSerialFifoControl) & (B_UART_FCR_FIFOE | B_UART_FCR_FIFO64))); + + // + // Set FIFO Polled Mode by clearing IER after setting FCR + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_IER, 0x00); + + // + // Put Modem Control Register(MCR) into its reset state of 0x00. + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, 0x00); + + return RETURN_SUCCESS; +} + +/** + Write data from buffer to serial device. + + Writes NumberOfBytes data bytes from Buffer to the serial device. + The number of bytes actually written to the serial device is returned. + If the return value is less than NumberOfBytes, then the write operation failed. + + If Buffer is NULL, then ASSERT(). + + If NumberOfBytes is zero, then return 0. + + @param Buffer Pointer to the data buffer to be written. + @param NumberOfBytes Number of bytes to written to the serial device. + + @retval 0 NumberOfBytes is 0. + @retval >0 The number of bytes written to the serial device. + If this value is less than NumberOfBytes, then the write operation failed. + +**/ +UINTN +EFIAPI +SerialPortWrite ( + IN UINT8 *Buffer, + IN UINTN NumberOfBytes + ) +{ + UINTN SerialRegisterBase; + UINTN Result; + UINTN Index; + UINTN FifoSize; + + if (Buffer == NULL) { + return 0; + } + + SerialRegisterBase = GetSerialRegisterBase (); + if (SerialRegisterBase == 0) { + return 0; + } + + if (NumberOfBytes == 0) { + // + // Flush the hardware + // + + // + // Wait for both the transmit FIFO and shift register empty. + // + while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) != (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) { + } + + // + // Wait for the hardware flow control signal + // + while (!SerialPortWritable (SerialRegisterBase)) { + } + + return 0; + } + + // + // Compute the maximum size of the Tx FIFO + // + FifoSize = 1; + if ((PcdGet8 (PcdSerialFifoControl) & B_UART_FCR_FIFOE) != 0) { + if ((PcdGet8 (PcdSerialFifoControl) & B_UART_FCR_FIFO64) == 0) { + FifoSize = 16; + } else { + FifoSize = PcdGet32 (PcdSerialExtendedTxFifoSize); + } + } + + Result = NumberOfBytes; + while (NumberOfBytes != 0) { + // + // Wait for the serial port to be ready, to make sure both the transmit FIFO + // and shift register empty. + // + while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) != (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) { + } + + // + // Fill then entire Tx FIFO + // + for (Index = 0; Index < FifoSize && NumberOfBytes != 0; Index++, NumberOfBytes--, Buffer++) { + // + // Wait for the hardware flow control signal + // + while (!SerialPortWritable (SerialRegisterBase)) { + } + + // + // Write byte to the transmit buffer. + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_TXBUF, *Buffer); + } + } + + return Result; +} + +/** + Reads data from a serial device into a buffer. + + @param Buffer Pointer to the data buffer to store the data read from the serial device. + @param NumberOfBytes Number of bytes to read from the serial device. + + @retval 0 NumberOfBytes is 0. + @retval >0 The number of bytes read from the serial device. + If this value is less than NumberOfBytes, then the read operation failed. + +**/ +UINTN +EFIAPI +SerialPortRead ( + OUT UINT8 *Buffer, + IN UINTN NumberOfBytes + ) +{ + UINTN SerialRegisterBase; + UINTN Result; + UINT8 Mcr; + + if (NULL == Buffer) { + return 0; + } + + SerialRegisterBase = GetSerialRegisterBase (); + if (SerialRegisterBase == 0) { + return 0; + } + + Mcr = (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_MCR) & ~B_UART_MCR_RTS); + + for (Result = 0; NumberOfBytes-- != 0; Result++, Buffer++) { + // + // Wait for the serial port to have some data. + // + while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & B_UART_LSR_RXRDY) == 0) { + if (PcdGetBool (PcdSerialUseHardwareFlowControl)) { + // + // Set RTS to let the peer send some data + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, (UINT8)(Mcr | B_UART_MCR_RTS)); + } + } + + if (PcdGetBool (PcdSerialUseHardwareFlowControl)) { + // + // Clear RTS to prevent peer from sending data + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, Mcr); + } + + // + // Read byte from the receive buffer. + // + *Buffer = SerialPortReadRegister (SerialRegisterBase, R_UART_RXBUF); + } + + return Result; +} + +/** + Polls a serial device to see if there is any data waiting to be read. + + Polls aserial device to see if there is any data waiting to be read. + If there is data waiting to be read from the serial device, then TRUE is returned. + If there is no data waiting to be read from the serial device, then FALSE is returned. + + @retval TRUE Data is waiting to be read from the serial device. + @retval FALSE There is no data waiting to be read from the serial device. + +**/ +BOOLEAN +EFIAPI +SerialPortPoll ( + VOID + ) +{ + UINTN SerialRegisterBase; + + SerialRegisterBase = GetSerialRegisterBase (); + if (SerialRegisterBase == 0) { + return FALSE; + } + + // + // Read the serial port status + // + if ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & B_UART_LSR_RXRDY) != 0) { + if (PcdGetBool (PcdSerialUseHardwareFlowControl)) { + // + // Clear RTS to prevent peer from sending data + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_MCR) & ~B_UART_MCR_RTS)); + } + + return TRUE; + } + + if (PcdGetBool (PcdSerialUseHardwareFlowControl)) { + // + // Set RTS to let the peer send some data + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, (UINT8)(SerialPortReadRegister (SerialRegisterBase, R_UART_MCR) | B_UART_MCR_RTS)); + } + + return FALSE; +} + +/** + Sets the control bits on a serial device. + + @param Control Sets the bits of Control that are settable. + + @retval RETURN_SUCCESS The new control bits were set on the serial device. + @retval RETURN_UNSUPPORTED The serial device does not support this operation. + @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly. + +**/ +RETURN_STATUS +EFIAPI +SerialPortSetControl ( + IN UINT32 Control + ) +{ + UINTN SerialRegisterBase; + UINT8 Mcr; + + // + // First determine the parameter is invalid. + // + if ((Control & (~(EFI_SERIAL_REQUEST_TO_SEND | EFI_SERIAL_DATA_TERMINAL_READY | + EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE))) != 0) + { + return RETURN_UNSUPPORTED; + } + + SerialRegisterBase = GetSerialRegisterBase (); + if (SerialRegisterBase == 0) { + return RETURN_UNSUPPORTED; + } + + // + // Read the Modem Control Register. + // + Mcr = SerialPortReadRegister (SerialRegisterBase, R_UART_MCR); + Mcr &= (~(B_UART_MCR_DTRC | B_UART_MCR_RTS)); + + if ((Control & EFI_SERIAL_DATA_TERMINAL_READY) == EFI_SERIAL_DATA_TERMINAL_READY) { + Mcr |= B_UART_MCR_DTRC; + } + + if ((Control & EFI_SERIAL_REQUEST_TO_SEND) == EFI_SERIAL_REQUEST_TO_SEND) { + Mcr |= B_UART_MCR_RTS; + } + + // + // Write the Modem Control Register. + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_MCR, Mcr); + + return RETURN_SUCCESS; +} + +/** + Retrieve the status of the control bits on a serial device. + + @param Control A pointer to return the current control signals from the serial device. + + @retval RETURN_SUCCESS The control bits were read from the serial device. + @retval RETURN_UNSUPPORTED The serial device does not support this operation. + @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly. + +**/ +RETURN_STATUS +EFIAPI +SerialPortGetControl ( + OUT UINT32 *Control + ) +{ + UINTN SerialRegisterBase; + UINT8 Msr; + UINT8 Mcr; + UINT8 Lsr; + + SerialRegisterBase = GetSerialRegisterBase (); + if (SerialRegisterBase == 0) { + return RETURN_UNSUPPORTED; + } + + *Control = 0; + + // + // Read the Modem Status Register. + // + Msr = SerialPortReadRegister (SerialRegisterBase, R_UART_MSR); + + if ((Msr & B_UART_MSR_CTS) == B_UART_MSR_CTS) { + *Control |= EFI_SERIAL_CLEAR_TO_SEND; + } + + if ((Msr & B_UART_MSR_DSR) == B_UART_MSR_DSR) { + *Control |= EFI_SERIAL_DATA_SET_READY; + } + + if ((Msr & B_UART_MSR_RI) == B_UART_MSR_RI) { + *Control |= EFI_SERIAL_RING_INDICATE; + } + + if ((Msr & B_UART_MSR_DCD) == B_UART_MSR_DCD) { + *Control |= EFI_SERIAL_CARRIER_DETECT; + } + + // + // Read the Modem Control Register. + // + Mcr = SerialPortReadRegister (SerialRegisterBase, R_UART_MCR); + + if ((Mcr & B_UART_MCR_DTRC) == B_UART_MCR_DTRC) { + *Control |= EFI_SERIAL_DATA_TERMINAL_READY; + } + + if ((Mcr & B_UART_MCR_RTS) == B_UART_MCR_RTS) { + *Control |= EFI_SERIAL_REQUEST_TO_SEND; + } + + if (PcdGetBool (PcdSerialUseHardwareFlowControl)) { + *Control |= EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE; + } + + // + // Read the Line Status Register. + // + Lsr = SerialPortReadRegister (SerialRegisterBase, R_UART_LSR); + + if ((Lsr & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) == (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) { + *Control |= EFI_SERIAL_OUTPUT_BUFFER_EMPTY; + } + + if ((Lsr & B_UART_LSR_RXRDY) == 0) { + *Control |= EFI_SERIAL_INPUT_BUFFER_EMPTY; + } + + return RETURN_SUCCESS; +} + +/** + Sets the baud rate, receive FIFO depth, transmit/receice time out, parity, + data bits, and stop bits on a serial device. + + @param BaudRate The requested baud rate. A BaudRate value of 0 will use the + device's default interface speed. + On output, the value actually set. + @param ReveiveFifoDepth The requested depth of the FIFO on the receive side of the + serial interface. A ReceiveFifoDepth value of 0 will use + the device's default FIFO depth. + On output, the value actually set. + @param Timeout The requested time out for a single character in microseconds. + This timeout applies to both the transmit and receive side of the + interface. A Timeout value of 0 will use the device's default time + out value. + On output, the value actually set. + @param Parity The type of parity to use on this serial device. A Parity value of + DefaultParity will use the device's default parity value. + On output, the value actually set. + @param DataBits The number of data bits to use on the serial device. A DataBits + vaule of 0 will use the device's default data bit setting. + On output, the value actually set. + @param StopBits The number of stop bits to use on this serial device. A StopBits + value of DefaultStopBits will use the device's default number of + stop bits. + On output, the value actually set. + + @retval RETURN_SUCCESS The new attributes were set on the serial device. + @retval RETURN_UNSUPPORTED The serial device does not support this operation. + @retval RETURN_INVALID_PARAMETER One or more of the attributes has an unsupported value. + @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly. + +**/ +RETURN_STATUS +EFIAPI +SerialPortSetAttributes ( + IN OUT UINT64 *BaudRate, + IN OUT UINT32 *ReceiveFifoDepth, + IN OUT UINT32 *Timeout, + IN OUT EFI_PARITY_TYPE *Parity, + IN OUT UINT8 *DataBits, + IN OUT EFI_STOP_BITS_TYPE *StopBits + ) +{ + UINTN SerialRegisterBase; + UINT32 SerialBaudRate; + UINTN Divisor; + UINT8 Lcr; + UINT8 LcrData; + UINT8 LcrParity; + UINT8 LcrStop; + + SerialRegisterBase = GetSerialRegisterBase (); + if (SerialRegisterBase == 0) { + return RETURN_UNSUPPORTED; + } + + // + // Check for default settings and fill in actual values. + // + if (*BaudRate == 0) { + *BaudRate = PcdGet32 (PcdSerialBaudRate); + } + + SerialBaudRate = (UINT32)*BaudRate; + + if (*DataBits == 0) { + LcrData = (UINT8)(PcdGet8 (PcdSerialLineControl) & 0x3); + *DataBits = LcrData + 5; + } else { + if ((*DataBits < 5) || (*DataBits > 8)) { + return RETURN_INVALID_PARAMETER; + } + + // + // Map 5..8 to 0..3 + // + LcrData = (UINT8)(*DataBits - (UINT8)5); + } + + if (*Parity == DefaultParity) { + LcrParity = (UINT8)((PcdGet8 (PcdSerialLineControl) >> 3) & 0x7); + switch (LcrParity) { + case 0: + *Parity = NoParity; + break; + + case 3: + *Parity = EvenParity; + break; + + case 1: + *Parity = OddParity; + break; + + case 7: + *Parity = SpaceParity; + break; + + case 5: + *Parity = MarkParity; + break; + + default: + break; + } + } else { + switch (*Parity) { + case NoParity: + LcrParity = 0; + break; + + case EvenParity: + LcrParity = 3; + break; + + case OddParity: + LcrParity = 1; + break; + + case SpaceParity: + LcrParity = 7; + break; + + case MarkParity: + LcrParity = 5; + break; + + default: + return RETURN_INVALID_PARAMETER; + } + } + + if (*StopBits == DefaultStopBits) { + LcrStop = (UINT8)((PcdGet8 (PcdSerialLineControl) >> 2) & 0x1); + switch (LcrStop) { + case 0: + *StopBits = OneStopBit; + break; + + case 1: + if (*DataBits == 5) { + *StopBits = OneFiveStopBits; + } else { + *StopBits = TwoStopBits; + } + + break; + + default: + break; + } + } else { + switch (*StopBits) { + case OneStopBit: + LcrStop = 0; + break; + + case OneFiveStopBits: + case TwoStopBits: + LcrStop = 1; + break; + + default: + return RETURN_INVALID_PARAMETER; + } + } + + // + // Calculate divisor for baud generator + // Ref_Clk_Rate / Baud_Rate / 16 + // + Divisor = PcdGet32 (PcdSerialClockRate) / (SerialBaudRate * 16); + if ((PcdGet32 (PcdSerialClockRate) % (SerialBaudRate * 16)) >= SerialBaudRate * 8) { + Divisor++; + } + + // + // Configure baud rate + // + SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, B_UART_LCR_DLAB); + SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_HIGH, (UINT8)(Divisor >> 8)); + SerialPortWriteRegister (SerialRegisterBase, R_UART_BAUD_LOW, (UINT8)(Divisor & 0xff)); + + // + // Clear DLAB and configure Data Bits, Parity, and Stop Bits. + // Strip reserved bits from line control value + // + Lcr = (UINT8)((LcrParity << 3) | (LcrStop << 2) | LcrData); + SerialPortWriteRegister (SerialRegisterBase, R_UART_LCR, (UINT8)(Lcr & 0x3F)); + + return RETURN_SUCCESS; +} + +/** Base Serial Port 16550 Library Constructor + + @retval RETURN_SUCCESS Success. +**/ +EFI_STATUS +EFIAPI +BaseSerialPortLib16550 ( + VOID + ) +{ + // Nothing to do here. This constructor is added to + // enable the chain of constructor invocation for + // dependent libraries. + return RETURN_SUCCESS; +} |