From: Vu Nguyen <vungu...@os.amperecomputing.com>
The DwI2cLib library provides basic functions to control the I2C
controller on Ampere Altra processor.
Cc: Thang Nguyen <th...@os.amperecomputing.com>
Cc: Chuong Tran <chu...@os.amperecomputing.com>
Cc: Phong Vo <ph...@os.amperecomputing.com>
Cc: Leif Lindholm <l...@nuviainc.com>
Cc: Michael D Kinney <michael.d.kin...@intel.com>
Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
Cc: Nate DeSimone <nathaniel.l.desim...@intel.com>
Signed-off-by: Vu Nguyen <vungu...@os.amperecomputing.com>
---
Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dec | 3 +
Silicon/Ampere/AmpereAltraPkg/Library/DwI2cLib/DwI2cLib.inf | 38 +
Silicon/Ampere/AmpereAltraPkg/Include/Library/I2cLib.h | 100 +++
Silicon/Ampere/AmpereAltraPkg/Library/DwI2cLib/DwI2cLib.c | 883
++++++++++++++++++++
4 files changed, 1024 insertions(+)
diff --git a/Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dec
b/Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dec
index 73097afaf841..8be6a329bb26 100644
--- a/Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dec
+++ b/Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dec
@@ -28,6 +28,9 @@ [LibraryClasses]
## @libraryclass Defines a set of methods to communicate with SCP.
SystemFirmwareInterfaceLib|Silicon/Ampere/AmpereAltraPkg/Include/Library/SystemFirmwareInterfaceLib.h
+ ## @libraryclass Defines a set of methods to read/write to I2C devices.
+ I2cLib|Silicon/Ampere/AmpereAltraPkg/Include/Library/I2cLib.h
+
## @libraryclass Defines a set of methods to communicate with secure
parition over MM interface.
MmCommunicationLib|Silicon/Ampere/AmpereAltraPkg/Include/Library/MmCommunicationLib.h
diff --git a/Silicon/Ampere/AmpereAltraPkg/Library/DwI2cLib/DwI2cLib.inf
b/Silicon/Ampere/AmpereAltraPkg/Library/DwI2cLib/DwI2cLib.inf
new file mode 100644
index 000000000000..091f5f9b310c
--- /dev/null
+++ b/Silicon/Ampere/AmpereAltraPkg/Library/DwI2cLib/DwI2cLib.inf
@@ -0,0 +1,38 @@
+## @file
+# Component description for DwI2cLib library for the Designware I2C controller.
+#
+# Copyright (c) 2020 - 2021, Ampere Computing LLC. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x0001001B
+ BASE_NAME = DwI2cLib
+ FILE_GUID = 222609E2-C181-11E6-A4A6-CEC0C932CE01
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = I2cLib
+ CONSTRUCTOR = I2cLibConstructor
+
+[Sources]
+ DwI2cLib.c
+
+[Packages]
+ ArmPkg/ArmPkg.dec
+ ArmPlatformPkg/ArmPlatformPkg.dec
+ MdePkg/MdePkg.dec
+ Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ BaseMemoryLib
+ DebugLib
+ HobLib
+ IoLib
+ TimerLib
+
+[Guids]
+ gEfiEventVirtualAddressChangeGuid
+ gPlatformHobGuid
diff --git a/Silicon/Ampere/AmpereAltraPkg/Include/Library/I2cLib.h
b/Silicon/Ampere/AmpereAltraPkg/Include/Library/I2cLib.h
new file mode 100644
index 000000000000..f13794171029
--- /dev/null
+++ b/Silicon/Ampere/AmpereAltraPkg/Include/Library/I2cLib.h
@@ -0,0 +1,100 @@
+/** @file
+ Library implementation for the Designware I2C controller.
+
+ Copyright (c) 2020 - 2021, Ampere Computing LLC. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef I2C_LIB_H_
+#define I2C_LIB_H_
+
+#include <Uefi/UefiBaseType.h>
+
+/**
+ Write to I2C bus.
+
+ @param[in] Bus I2C bus Id.
+ @param[in] SlaveAddr The address of slave device on the bus.
+ @param[in,out] Buf Buffer that holds data to write.
+ @param[in,out] WriteLength Pointer to length of buffer.
+
+ @return EFI_SUCCESS Write successfully.
+ @return EFI_INVALID_PARAMETER A parameter is invalid.
+ @return EFI_UNSUPPORTED The bus is not supported.
+ @return EFI_NOT_READY The device/bus is not ready.
+ @return EFI_TIMEOUT Timeout why transferring data.
+
+**/
+EFI_STATUS
+EFIAPI
+I2cWrite (
+ IN UINT32 Bus,
+ IN UINT32 SlaveAddr,
+ IN OUT UINT8 *Buf,
+ IN OUT UINT32 *WriteLength
+ );
+
+/**
+ Read data from I2C bus.
+
+ @param[in] Bus I2C bus Id.
+ @param[in] SlaveAddr The address of slave device on the bus.
+ @param[in] BufCmd Buffer where to send the command.
+ @param[in] CmdLength Pointer to length of BufCmd.
+ @param[in,out] Buf Buffer where to put the read data to.
+ @param[in,out] ReadLength Pointer to length of buffer.
+
+ @return EFI_SUCCESS Read successfully.
+ @return EFI_INVALID_PARAMETER A parameter is invalid.
+ @return EFI_UNSUPPORTED The bus is not supported.
+ @return EFI_NOT_READY The device/bus is not ready.
+ @return EFI_TIMEOUT Timeout why transferring data.
+ @return EFI_CRC_ERROR There are errors on receiving data.
+
+**/
+EFI_STATUS
+EFIAPI
+I2cRead (
+ IN UINT32 Bus,
+ IN UINT32 SlaveAddr,
+ IN UINT8 *BufCmd,
+ IN UINT32 CmdLength,
+ IN OUT UINT8 *Buf,
+ IN OUT UINT32 *ReadLength
+ );
+
+/**
+ Setup new transaction with I2C slave device.
+
+ @param[in] Bus I2C bus Id.
+ @param[in] BusSpeed I2C bus speed in Hz.
+
+ @retval EFI_SUCCESS Success.
+ @retval EFI_INVALID_PARAMETER A parameter is invalid.
+
+**/
+EFI_STATUS
+EFIAPI
+I2cProbe (
+ IN UINT32 Bus,
+ IN UINTN BusSpeed
+ );
+
+/**
+ Setup a bus that to be used in runtime service.
+
+ @param[in] Bus I2C bus Id.
+
+ @retval EFI_SUCCESS Success.
+ @retval Otherwise Error code.
+
+**/
+EFI_STATUS
+EFIAPI
+I2cSetupRuntime (
+ IN UINT32 Bus
+ );
+
+#endif /* I2C_LIB_H_ */
diff --git a/Silicon/Ampere/AmpereAltraPkg/Library/DwI2cLib/DwI2cLib.c
b/Silicon/Ampere/AmpereAltraPkg/Library/DwI2cLib/DwI2cLib.c
new file mode 100644
index 000000000000..5e7cd020223c
--- /dev/null
+++ b/Silicon/Ampere/AmpereAltraPkg/Library/DwI2cLib/DwI2cLib.c
@@ -0,0 +1,883 @@
+/** @file
+
+ Copyright (c) 2020 - 2021, Ampere Computing LLC. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiDxe.h>
+#include <Uefi.h>
+
+#include <Guid/PlatformInfoHobGuid.h>
+#include <Library/DebugLib.h>
+#include <Library/DxeServicesTableLib.h>
+#include <Library/HobLib.h>
+#include <Library/I2cLib.h>
+#include <Library/IoLib.h>
+#include <Library/TimerLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiRuntimeLib.h>
+#include <PlatformInfoHob.h>
+
+#define I2cSync() { asm volatile ("dmb ish" : : : "memory"); }
+
+//
+// Runtime needs to be 64K alignment
+//
+#define RUNTIME_ADDRESS_MASK (~(SIZE_64KB - 1))
+#define RUNTIME_ADDRESS_LENGTH SIZE_64KB
+
+//
+// Private I2C bus data
+//
+typedef struct {
+ UINTN Base;
+ UINT32 BusSpeed;
+ UINT32 RxFifo;
+ UINT32 TxFifo;
+ UINT32 PollingTime;
+ UINT32 Enabled;
+} DW_I2C_CONTEXT_T;
+
+//
+// I2C SCL counter macros
+//
+typedef enum {
+ I2cSpeedModeStandard = 0,
+ I2cSpeedModeFast,
+} I2C_SPEED_MODE;
+
+#define DW_I2C_MAXIMUM_SPEED_HZ 400000
+
+typedef enum {
+ I2cSclSpkLen = 0,
+ I2cSclHcnt,
+ I2cSclLcnt,
+} I2C_SCL_PARAM;
+
+STATIC UINT32 I2cSclParam[][3] = {
+ /* SPK_LEN, HCNT, LCNT */
+ [I2cSpeedModeStandard] = { 10, 0x3E2, 0x47D }, // SS (Standard Speed)
+ [I2cSpeedModeFast] = { 10, 0xA4, 0x13F }, // FS (Fast Speed)
+};
+
+STATIC BOOLEAN mI2cRuntimeEnableArray[MAX_PLATFORM_I2C_BUS_NUM] =
{FALSE};
+STATIC UINTN mI2cBaseArray[MAX_PLATFORM_I2C_BUS_NUM] =
{PLATFORM_I2C_REGISTER_BASE};
+STATIC DW_I2C_CONTEXT_T mI2cBusList[MAX_PLATFORM_I2C_BUS_NUM];
+STATIC UINTN mI2cClock = 0;
+STATIC EFI_EVENT mVirtualAddressChangeEvent = NULL;
+
+//
+// Registers
+//
+#define DW_IC_CON 0x0
+#define DW_IC_CON_MASTER BIT0
+#define DW_IC_CON_SPEED_STD BIT1
+#define DW_IC_CON_SPEED_FAST BIT2
+#define DW_IC_CON_10BITADDR_MASTER BIT4
+#define DW_IC_CON_RESTART_EN BIT5
+#define DW_IC_CON_SLAVE_DISABLE BIT6
+#define DW_IC_TAR 0x4
+#define DW_IC_TAR_10BITS BIT12
+#define DW_IC_SAR 0x8
+#define DW_IC_DATA_CMD 0x10
+#define DW_IC_DATA_CMD_RESTART BIT10
+#define DW_IC_DATA_CMD_STOP BIT9
+#define DW_IC_DATA_CMD_CMD BIT8
+#define DW_IC_DATA_CMD_DAT_MASK 0xFF
+#define DW_IC_SS_SCL_HCNT 0x14
+#define DW_IC_SS_SCL_LCNT 0x18
+#define DW_IC_FS_SCL_HCNT 0x1c
+#define DW_IC_FS_SCL_LCNT 0x20
+#define DW_IC_HS_SCL_HCNT 0x24
+#define DW_IC_HS_SCL_LCNT 0x28
+#define DW_IC_INTR_STAT 0x2c
+#define DW_IC_INTR_MASK 0x30
+#define DW_IC_INTR_RX_UNDER BIT0
+#define DW_IC_INTR_RX_OVER BIT1
+#define DW_IC_INTR_RX_FULL BIT2
+#define DW_IC_INTR_TX_EMPTY BIT4
+#define DW_IC_INTR_TX_ABRT BIT6
+#define DW_IC_INTR_ACTIVITY BIT8
+#define DW_IC_INTR_STOP_DET BIT9
+#define DW_IC_INTR_START_DET BIT10
+#define DW_IC_ERR_CONDITION \
+ (DW_IC_INTR_RX_UNDER | DW_IC_INTR_RX_OVER | DW_IC_INTR_TX_ABRT)
+#define DW_IC_RAW_INTR_STAT 0x34
+#define DW_IC_CLR_INTR 0x40
+#define DW_IC_CLR_RX_UNDER 0x44
+#define DW_IC_CLR_RX_OVER 0x48
+#define DW_IC_CLR_TX_ABRT 0x54
+#define DW_IC_CLR_ACTIVITY 0x5c
+#define DW_IC_CLR_STOP_DET 0x60
+#define DW_IC_CLR_START_DET 0x64
+#define DW_IC_ENABLE 0x6c
+#define DW_IC_STATUS 0x70
+#define DW_IC_STATUS_ACTIVITY BIT0
+#define DW_IC_STATUS_TFE BIT2
+#define DW_IC_STATUS_RFNE BIT3
+#define DW_IC_STATUS_MST_ACTIVITY BIT5
+#define DW_IC_TXFLR 0x74
+#define DW_IC_RXFLR 0x78
+#define DW_IC_SDA_HOLD 0x7c
+#define DW_IC_TX_ABRT_SOURCE 0x80
+#define DW_IC_ENABLE_STATUS 0x9c
+#define DW_IC_COMP_PARAM_1 0xf4
+#define DW_IC_COMP_PARAM_1_RX_BUFFER_DEPTH(x) \
+ ((((x) >> 8) & 0xFF) + 1)
+#define DW_IC_COMP_PARAM_1_TX_BUFFER_DEPTH(x) \
+ ((((x) >> 16) & 0xFF) + 1)
+#define DW_IC_COMP_TYPE 0xfc
+#define SB_DW_IC_CON 0xa8
+#define SB_DW_IC_SCL_TMO_CNT 0xac
+#define SB_DW_IC_RX_PEC 0xb0
+#define SB_DW_IC_ACK 0xb4
+#define SB_DW_IC_FLG 0xb8
+#define SB_DW_IC_FLG_CLR 0xbc
+#define SB_DW_IC_INTR_STAT 0xc0
+#define SB_DW_IC_INTR_STAT_MASK 0xc4
+#define SB_DW_IC_DEBUG_SEL 0xec
+#define SB_DW_IC_ACK_DEBUG 0xf0
+#define DW_IC_FS_SPKLEN 0xa0
+#define DW_IC_HS_SPKLEN 0xa4
+
+//
+// Timeout interval
+//
+// The interval is equal to the 10 times the signaling period
+// for the highest I2C transfer speed used in the system.
+//
+#define DW_POLL_INTERVAL_US(x) (10 * (1000000 / (x)))
+
+//
+// Maximum timeout count
+//
+#define DW_MAX_TRANSFER_POLL_COUNT 100000 // Maximum timeout: 10s
+#define DW_MAX_STATUS_POLL_COUNT 100
+
+#define DW_POLL_MST_ACTIVITY_INTERVAL_US 1000 // 1ms
+#define DW_MAX_MST_ACTIVITY_POLL_COUNT 20
+
+/**
+ Initialize I2C Bus
+ **/
+VOID
+I2cHWInit (
+ UINT32 Bus
+ )
+{
+ UINT32 Param;
+
+ mI2cBusList[Bus].Base = mI2cBaseArray[Bus];
+
+ Param = MmioRead32 (mI2cBusList[Bus].Base + DW_IC_COMP_PARAM_1);
+
+ mI2cBusList[Bus].PollingTime = DW_POLL_INTERVAL_US
(mI2cBusList[Bus].BusSpeed);
+ mI2cBusList[Bus].RxFifo = DW_IC_COMP_PARAM_1_RX_BUFFER_DEPTH (Param);
+ mI2cBusList[Bus].TxFifo = DW_IC_COMP_PARAM_1_TX_BUFFER_DEPTH (Param);
+ mI2cBusList[Bus].Enabled = 0;
+
+ DEBUG ((DEBUG_VERBOSE, "%a: Bus %d, Rx_Buffer %d, Tx_Buffer %d\n",
+ __FUNCTION__,
+ Bus,
+ mI2cBusList[Bus].RxFifo,
+ mI2cBusList[Bus].TxFifo
+ ));
+}
+
+/**
+ Enable or disable I2C Bus
+ */
+VOID
+I2cEnable (
+ UINT32 Bus,
+ UINT32 Enable
+ )
+{
+ UINT32 I2cStatusCnt;
+ UINTN Base;
+
+ Base = mI2cBusList[Bus].Base;
+ I2cStatusCnt = DW_MAX_STATUS_POLL_COUNT;
+ mI2cBusList[Bus].Enabled = Enable;
+
+ MmioWrite32 (Base + DW_IC_ENABLE, Enable);
+
+ do {
+ if ((MmioRead32 (Base + DW_IC_ENABLE_STATUS) & 0x01) == Enable) {
+ break;
+ }
+ MicroSecondDelay (mI2cBusList[Bus].PollingTime);
+ } while (I2cStatusCnt-- != 0);
+
+ if (I2cStatusCnt == 0) {
+ DEBUG ((DEBUG_ERROR, "%a: Enable/disable timeout\n", __FUNCTION__));
+ }
+
+ if ((Enable == 0) || (I2cStatusCnt == 0)) {
+ /* Unset the target adddress */
+ MmioWrite32 (Base + DW_IC_TAR, 0);
+ mI2cBusList[Bus].Enabled = 0;
+ }
+}
+
+/**
+ Setup Slave address
+ **/
+VOID
+I2cSetSlaveAddr (
+ UINT32 Bus,
+ UINT32 SlaveAddr
+ )
+{
+ UINTN Base;
+ UINT32 OldEnableStatus;
+
+ Base = mI2cBusList[Bus].Base;
+ OldEnableStatus = mI2cBusList[Bus].Enabled;
+
+ I2cEnable (Bus, 0);
+ MmioWrite32 (Base + DW_IC_TAR, SlaveAddr);
+ if (OldEnableStatus != 0) {
+ I2cEnable (Bus, 1);
+ }
+}
+
+/**
+ Check for errors on I2C Bus
+ **/
+UINT32
+I2cCheckErrors (
+ UINT32 Bus
+ )
+{
+ UINTN Base;
+ UINT32 ErrorStatus;
+
+ Base = mI2cBusList[Bus].Base;
+
+ ErrorStatus = MmioRead32 (Base + DW_IC_RAW_INTR_STAT) & DW_IC_ERR_CONDITION;
+
+ if ((ErrorStatus & DW_IC_INTR_RX_UNDER) != 0) {
+ DEBUG ((DEBUG_ERROR, "%a: RX_UNDER error on i2c bus %d error status
%08x\n",
+ __FUNCTION__,
+ Bus,
+ ErrorStatus
+ ));
+ MmioRead32 (Base + DW_IC_CLR_RX_UNDER);
+ }
+
+ if ((ErrorStatus & DW_IC_INTR_RX_OVER) != 0) {
+ DEBUG ((DEBUG_ERROR, "%a: RX_OVER error on i2c bus %d error status %08x\n",
+ __FUNCTION__,
+ Bus,
+ ErrorStatus
+ ));
+ MmioRead32 (Base + DW_IC_CLR_RX_OVER);
+ }
+
+ if ((ErrorStatus & DW_IC_INTR_TX_ABRT) != 0) {
+ DEBUG ((DEBUG_VERBOSE, "%a: TX_ABORT at source %08x\n",
+ __FUNCTION__,
+ MmioRead32 (Base + DW_IC_TX_ABRT_SOURCE)
+ ));
+ MmioRead32 (Base + DW_IC_CLR_TX_ABRT);
+ }
+
+ return ErrorStatus;
+}
+
+/**
+ Waiting for bus to not be busy
+ **/
+BOOLEAN
+I2cWaitBusNotBusy (
+ UINT32 Bus
+ )
+{
+ UINTN Base;
+ UINTN PollCount;
+
+ Base = mI2cBusList[Bus].Base;
+ PollCount = DW_MAX_MST_ACTIVITY_POLL_COUNT;
+
+ while ((MmioRead32 (Base + DW_IC_STATUS) & DW_IC_STATUS_MST_ACTIVITY) != 0) {
+ if (PollCount == 0) {
+ DEBUG ((DEBUG_VERBOSE, "%a: Timeout while waiting for bus ready\n",
__FUNCTION__));
+ return FALSE;
+ }
+ PollCount--;
+ /*
+ * A delay isn't absolutely necessary.
+ * But to ensure that we don't hammer the bus constantly,
+ * delay for DW_POLL_MST_ACTIVITY_INTERVAL_US as with other implementation.
+ */
+ MicroSecondDelay (DW_POLL_MST_ACTIVITY_INTERVAL_US);
+ }
+
+ return TRUE;
+}
+
+/**
+ Waiting for TX FIFO buffer available
+ **/
+EFI_STATUS
+I2cWaitTxData (
+ UINT32 Bus
+ )
+{
+ UINTN Base;
+ UINTN PollCount;
+
+ Base = mI2cBusList[Bus].Base;
+ PollCount = 0;
+
+ while (MmioRead32 (Base + DW_IC_TXFLR) == mI2cBusList[Bus].TxFifo) {
+ if (PollCount++ >= DW_MAX_TRANSFER_POLL_COUNT) {
+ DEBUG ((DEBUG_ERROR, "%a: Timeout waiting for TX buffer available\n",
__FUNCTION__));
+ return EFI_TIMEOUT;
+ }
+ MicroSecondDelay (mI2cBusList[Bus].PollingTime);
+ }
+
+ return EFI_SUCCESS;
+}
+
+/**
+ Waiting for RX FIFO buffer available
+ **/
+EFI_STATUS
+I2cWaitRxData (
+ UINT32 Bus
+ )
+{
+ UINTN Base;
+ UINTN PollCount;
+
+ Base = mI2cBusList[Bus].Base;
+ PollCount = 0;
+
+ while ((MmioRead32 (Base + DW_IC_STATUS) & DW_IC_STATUS_RFNE) == 0) {
+ if (PollCount++ >= DW_MAX_TRANSFER_POLL_COUNT) {
+ DEBUG ((DEBUG_ERROR, "%a: Timeout waiting for RX buffer available\n",
__FUNCTION__));
+ return EFI_TIMEOUT;
+ }
+
+ if ((I2cCheckErrors (Bus) & DW_IC_INTR_TX_ABRT) != 0) {
+ return EFI_ABORTED;
+ }
+
+ MicroSecondDelay (mI2cBusList[Bus].PollingTime);
+ }
+
+ return EFI_SUCCESS;
+}
+
+/**
+ Initialize the Designware I2C SCL Counts
+
+ This functions configures SCL clock Count for Standard Speed (SS) and Fast
Speed (FS) mode.
+ **/
+VOID
+I2cSclInit (
+ UINT32 Bus,
+ UINT32 I2cClkFreq,
+ UINT32 I2cSpeed
+ )
+{
+ UINT16 IcCon;
+ UINTN Base;
+ UINT32 I2cSpeedKhz;
+
+ Base = mI2cBusList[Bus].Base;
+ I2cSpeedKhz = I2cSpeed / 1000;
+
+ DEBUG ((DEBUG_VERBOSE, "%a: Bus %d I2cClkFreq %d I2cSpeed %d\n",
+ __FUNCTION__,
+ Bus,
+ I2cClkFreq,
+ I2cSpeed
+ ));
+
+ IcCon = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | DW_IC_CON_RESTART_EN;
+
+ if (I2cSpeedKhz <= 100) {
+ IcCon |= DW_IC_CON_SPEED_STD;
+ // Standard speed mode
+ MmioWrite32 (Base + DW_IC_FS_SPKLEN,
I2cSclParam[I2cSpeedModeStandard][I2cSclSpkLen]);
+ MmioWrite32 (Base + DW_IC_SS_SCL_HCNT,
I2cSclParam[I2cSpeedModeStandard][I2cSclHcnt]);
+ MmioWrite32 (Base + DW_IC_SS_SCL_LCNT,
I2cSclParam[I2cSpeedModeStandard][I2cSclLcnt]);
+ } else if (I2cSpeedKhz > 100 && I2cSpeedKhz <= 400) {
+ IcCon |= DW_IC_CON_SPEED_FAST;
+ // Fast speed mode
+ MmioWrite32 (Base + DW_IC_FS_SPKLEN,
I2cSclParam[I2cSpeedModeFast][I2cSclSpkLen]);
+ MmioWrite32 (Base + DW_IC_FS_SCL_HCNT,
I2cSclParam[I2cSpeedModeFast][I2cSclHcnt]);
+ MmioWrite32 (Base + DW_IC_FS_SCL_LCNT,
I2cSclParam[I2cSpeedModeFast][I2cSclLcnt]);
+ }
+ MmioWrite32 (Base + DW_IC_CON, IcCon);
+}
+
+/**
+ Initialize the designware i2c master hardware
+ **/
+EFI_STATUS
+I2cInit (
+ UINT32 Bus,
+ UINTN BusSpeed
+ )
+{
+ UINTN Base;
+
+ ASSERT (mI2cClock != 0);
+
+ mI2cBusList[Bus].BusSpeed = BusSpeed;
+ I2cHWInit (Bus);
+
+ Base = mI2cBusList[Bus].Base;
+
+ /* Disable the adapter and interrupt */
+ I2cEnable (Bus, 0);
+ MmioWrite32 (Base + DW_IC_INTR_MASK, 0);
+
+ /* Set standard and fast speed divider for high/low periods */
+ I2cSclInit (Bus, mI2cClock, BusSpeed);
+ MmioWrite32 (Base + DW_IC_SDA_HOLD, 0x4b);
+
+ return EFI_SUCCESS;
+}
+
+/**
+ Wait the transaction finished
+ **/
+EFI_STATUS
+I2cFinish (
+ UINT32 Bus
+ )
+{
+ UINTN Base;
+ UINTN PollCount;
+
+ Base = mI2cBusList[Bus].Base;
+ PollCount = 0;
+
+ /* Wait for TX FIFO empty */
+ do {
+ if ((MmioRead32 (Base + DW_IC_STATUS) & DW_IC_STATUS_TFE) != 0) {
+ break;
+ }
+ MicroSecondDelay (mI2cBusList[Bus].PollingTime);
+ } while (PollCount++ < DW_MAX_TRANSFER_POLL_COUNT);
+
+ if (PollCount >= DW_MAX_TRANSFER_POLL_COUNT) {
+ DEBUG ((DEBUG_ERROR, "%a: Timeout waiting for TX FIFO empty\n",
__FUNCTION__));
+ return EFI_TIMEOUT;
+ }
+
+ /* Wait for STOP signal detected on the bus */
+ PollCount = 0;
+ do {
+ if ((MmioRead32 (Base + DW_IC_RAW_INTR_STAT) & DW_IC_INTR_STOP_DET) != 0) {
+ MmioRead32 (Base + DW_IC_CLR_STOP_DET);
+ return EFI_SUCCESS;
+ }
+ MicroSecondDelay (mI2cBusList[Bus].PollingTime);
+ } while (PollCount++ < DW_MAX_TRANSFER_POLL_COUNT);
+
+ DEBUG ((DEBUG_ERROR, "%a: Timeout waiting for transaction finished\n",
__FUNCTION__));
+ return EFI_TIMEOUT;
+}
+
+EFI_STATUS
+InternalI2cWrite (
+ UINT32 Bus,
+ UINT8 *Buf,
+ UINT32 *Length
+ )
+{
+ EFI_STATUS Status;
+ UINTN WriteCount;
+ UINTN Base;
+
+ Status = EFI_SUCCESS;
+ Base = mI2cBusList[Bus].Base;
+
+ DEBUG ((DEBUG_VERBOSE, "%a: Write Bus %d Buf %p Length %d\n",
+ __FUNCTION__,
+ Bus,
+ Buf,
+ *Length
+ ));
+ I2cEnable (Bus, 1);
+
+ WriteCount = 0;
+ while ((*Length - WriteCount) != 0) {
+ Status = I2cWaitTxData (Bus);
+ if (EFI_ERROR (Status)) {
+ MmioWrite32 (Base + DW_IC_DATA_CMD, DW_IC_DATA_CMD_STOP);
+ I2cSync ();
+ goto Exit;
+ }
+
+ if (WriteCount == *Length - 1) {
+ MmioWrite32 (
+ Base + DW_IC_DATA_CMD,
+ (Buf[WriteCount] & DW_IC_DATA_CMD_DAT_MASK) | DW_IC_DATA_CMD_STOP
+ );
+ } else {
+ MmioWrite32 (
+ Base + DW_IC_DATA_CMD,
+ Buf[WriteCount] & DW_IC_DATA_CMD_DAT_MASK
+ );
+ }
+ I2cSync ();
+ WriteCount++;
+ }
+
+Exit:
+ *Length = WriteCount;
+ I2cFinish (Bus);
+ I2cWaitBusNotBusy (Bus);
+ I2cEnable (Bus, 0);
+
+ return Status;
+}
+
+EFI_STATUS
+InternalI2cRead (
+ UINT32 Bus,
+ UINT8 *BufCmd,
+ UINT32 CmdLength,
+ UINT8 *Buf,
+ UINT32 *Length
+ )
+{
+ EFI_STATUS Status;
+ UINTN Base;
+ UINT32 CmdSend;
+ UINT32 TxLimit, RxLimit;
+ UINTN Idx;
+ UINTN Count;
+ UINTN ReadCount;
+ UINTN WriteCount;
+
+ Status = EFI_SUCCESS;
+ Base = mI2cBusList[Bus].Base;
+ Count = 0;
+
+ DEBUG ((DEBUG_VERBOSE, "%a: Read Bus %d Buf %p Length:%d\n",
+ __FUNCTION__,
+ Bus,
+ Buf,
+ *Length
+ ));
+
+ I2cEnable (Bus, 1);
+
+ /* Write command data */
+ WriteCount = 0;
+ while (CmdLength != 0) {
+ TxLimit = mI2cBusList[Bus].TxFifo - MmioRead32 (Base + DW_IC_TXFLR);
+ Count = CmdLength > TxLimit ? TxLimit : CmdLength;
+
+ for (Idx = 0; Idx < Count; Idx++ ) {
+ CmdSend = BufCmd[WriteCount++] & DW_IC_DATA_CMD_DAT_MASK;
+ MmioWrite32 (Base + DW_IC_DATA_CMD, CmdSend);
+ I2cSync ();
+
+ if (I2cCheckErrors (Bus) != 0) {
+ Status = EFI_CRC_ERROR;
+ goto Exit;
+ }
+ CmdLength--;
+ }
+
+ Status = I2cWaitTxData (Bus);
+ if (EFI_ERROR (Status)) {
+ MmioWrite32 (Base + DW_IC_DATA_CMD, DW_IC_DATA_CMD_STOP);
+ I2cSync ();
+ goto Exit;
+ }
+ }
+
+ ReadCount = 0;
+ WriteCount = 0;
+ while ((*Length - ReadCount) != 0) {
+ TxLimit = mI2cBusList[Bus].TxFifo - MmioRead32 (Base + DW_IC_TXFLR);
+ RxLimit = mI2cBusList[Bus].RxFifo - MmioRead32 (Base + DW_IC_RXFLR);
+ Count = *Length - ReadCount;
+ Count = Count > RxLimit ? RxLimit : Count;
+ Count = Count > TxLimit ? TxLimit : Count;
+
+ for (Idx = 0; Idx < Count; Idx++ ) {
+ CmdSend = DW_IC_DATA_CMD_CMD;
+ if (WriteCount == *Length - 1) {
+ CmdSend |= DW_IC_DATA_CMD_STOP;
+ }
+ MmioWrite32 (Base + DW_IC_DATA_CMD, CmdSend);
+ I2cSync ();
+ WriteCount++;
+
+ if (I2cCheckErrors (Bus) != 0) {
+ DEBUG ((DEBUG_VERBOSE,
+ "%a: Sending reading command remaining length %d CRC error\n",
+ __FUNCTION__,
+ *Length
+ ));
+ Status = EFI_CRC_ERROR;
+ goto Exit;
+ }
+ }
+
+ for (Idx = 0; Idx < Count; Idx++ ) {
+ Status = I2cWaitRxData (Bus);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((DEBUG_VERBOSE,
+ "%a: Reading remaining length %d failed to wait data\n",
+ __FUNCTION__,
+ *Length
+ ));
+
+ if (Status != EFI_ABORTED) {
+ MmioWrite32 (Base + DW_IC_DATA_CMD, DW_IC_DATA_CMD_STOP);
+ I2cSync ();
+ }
+
+ goto Exit;
+ }
+
+ Buf[ReadCount++] = MmioRead32 (Base + DW_IC_DATA_CMD) &
DW_IC_DATA_CMD_DAT_MASK;
+ I2cSync ();
+
+ if (I2cCheckErrors (Bus) != 0) {
+ DEBUG ((DEBUG_VERBOSE, "%a: Reading remaining length %d CRC error\n",
+ __FUNCTION__,
+ *Length
+ ));
+ Status = EFI_CRC_ERROR;
+ goto Exit;
+ }
+ }
+ }
+
+Exit:
+ *Length = ReadCount;
+ I2cFinish (Bus);
+ I2cWaitBusNotBusy (Bus);
+ I2cEnable (Bus, 0);
+
+ return Status;
+}
+
+/**
+ Write to I2C bus.
+
+ @param[in] Bus I2C bus Id.
+ @param[in] SlaveAddr The address of slave device on the bus.
+ @param[in,out] Buf Buffer that holds data to write.
+ @param[in,out] WriteLength Pointer to length of buffer.
+
+ @return EFI_SUCCESS Write successfully.
+ @return EFI_INVALID_PARAMETER A parameter is invalid.
+ @return EFI_UNSUPPORTED The bus is not supported.
+ @return EFI_NOT_READY The device/bus is not ready.
+ @return EFI_TIMEOUT Timeout why transferring data.
+
+**/
+EFI_STATUS
+EFIAPI
+I2cWrite (
+ IN UINT32 Bus,
+ IN UINT32 SlaveAddr,
+ IN OUT UINT8 *Buf,
+ IN OUT UINT32 *WriteLength
+ )
+{
+ if (Bus >= MAX_PLATFORM_I2C_BUS_NUM
+ || Buf == NULL
+ || WriteLength == NULL)
+ {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ I2cSetSlaveAddr (Bus, SlaveAddr);
+
+ return InternalI2cWrite (Bus, Buf, WriteLength);
+}
+
+/**
+ Read data from I2C bus.
+
+ @param[in] Bus I2C bus Id.
+ @param[in] SlaveAddr The address of slave device on the bus.
+ @param[in] BufCmd Buffer where to send the command.
+ @param[in] CmdLength Pointer to length of BufCmd.
+ @param[in,out] Buf Buffer where to put the read data to.
+ @param[in,out] ReadLength Pointer to length of buffer.
+
+ @return EFI_SUCCESS Read successfully.
+ @return EFI_INVALID_PARAMETER A parameter is invalid.
+ @return EFI_UNSUPPORTED The bus is not supported.
+ @return EFI_NOT_READY The device/bus is not ready.
+ @return EFI_TIMEOUT Timeout why transferring data.
+ @return EFI_CRC_ERROR There are errors on receiving data.
+
+**/
+EFI_STATUS
+EFIAPI
+I2cRead (
+ IN UINT32 Bus,
+ IN UINT32 SlaveAddr,
+ IN UINT8 *BufCmd,
+ IN UINT32 CmdLength,
+ IN OUT UINT8 *Buf,
+ IN OUT UINT32 *ReadLength
+ )
+{
+ if (Bus >= MAX_PLATFORM_I2C_BUS_NUM
+ || Buf == NULL
+ || ReadLength == NULL)
+ {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ I2cSetSlaveAddr (Bus, SlaveAddr);
+
+ return InternalI2cRead (Bus, BufCmd, CmdLength, Buf, ReadLength);
+}
+
+/**
+ Setup new transaction with I2C slave device.
+
+ @param[in] Bus I2C bus Id.
+ @param[in] BusSpeed I2C bus speed in Hz.
+
+ @retval EFI_SUCCESS Success.
+ @retval EFI_INVALID_PARAMETER A parameter is invalid.
+
+**/
+EFI_STATUS
+EFIAPI
+I2cProbe (
+ IN UINT32 Bus,
+ IN UINTN BusSpeed
+ )
+{
+ if (Bus >= MAX_PLATFORM_I2C_BUS_NUM
+ || BusSpeed > DW_I2C_MAXIMUM_SPEED_HZ)
+ {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ return I2cInit (Bus, BusSpeed);
+}
+
+/**
+ * Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.
+ *
+ * This is a notification function registered on
EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.
+ * It convers pointer to new virtual address.
+ *
+ * @param Event Event whose notification function is being invoked.
+ * @param Context Pointer to the notification function's context.
+ */
+VOID
+EFIAPI
+I2cVirtualAddressChangeEvent (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+ UINTN Count;
+
+ EfiConvertPointer (0x0, (VOID **)&mI2cBusList);
+ EfiConvertPointer (0x0, (VOID **)&mI2cBaseArray);
+ EfiConvertPointer (0x0, (VOID **)&mI2cClock);
+ for (Count = 0; Count < MAX_PLATFORM_I2C_BUS_NUM; Count++) {
+ if (!mI2cRuntimeEnableArray[Count]) {
+ continue;
+ }
+ EfiConvertPointer (0x0, (VOID **)&mI2cBaseArray[Count]);
+ EfiConvertPointer (0x0, (VOID **)&mI2cBusList[Count].Base);
+ }
+}
+
+/**
+ Setup a bus that to be used in runtime service.
+
+ @param[in] Bus I2C bus Id.
+
+ @retval EFI_SUCCESS Success.
+ @retval Otherwise Error code.
+
+**/
+EFI_STATUS
+EFIAPI
+I2cSetupRuntime (
+ IN UINT32 Bus
+ )
+{
+ EFI_STATUS Status;
+ EFI_GCD_MEMORY_SPACE_DESCRIPTOR Descriptor;
+
+ if (Bus >= MAX_PLATFORM_I2C_BUS_NUM) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if (mVirtualAddressChangeEvent == NULL) {
+ /*
+ * Register for the virtual address change event
+ */
+ Status = gBS->CreateEventEx (
+ EVT_NOTIFY_SIGNAL,
+ TPL_NOTIFY,
+ I2cVirtualAddressChangeEvent,
+ NULL,
+ &gEfiEventVirtualAddressChangeGuid,
+ &mVirtualAddressChangeEvent
+ );
+ ASSERT_EFI_ERROR (Status);
+ }
+
+ Status = gDS->GetMemorySpaceDescriptor (
+ mI2cBaseArray[Bus] & RUNTIME_ADDRESS_MASK,
+ &Descriptor
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ Status = gDS->SetMemorySpaceAttributes (
+ mI2cBaseArray[Bus] & RUNTIME_ADDRESS_MASK,
+ RUNTIME_ADDRESS_LENGTH,
+ Descriptor.Attributes | EFI_MEMORY_RUNTIME
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ mI2cRuntimeEnableArray[Bus] = TRUE;
+
+ return Status;
+}
+
+EFI_STATUS
+EFIAPI
+I2cLibConstructor (
+ VOID
+ )
+{
+ VOID *Hob;
+ PLATFORM_INFO_HOB *PlatformHob;
+
+ /* Get I2C Clock from the Platform HOB */
+ Hob = GetFirstGuidHob (&gPlatformHobGuid);
+ if (Hob == NULL) {
+ return EFI_NOT_FOUND;
+ }
+ PlatformHob = (PLATFORM_INFO_HOB *)GET_GUID_HOB_DATA (Hob);
+ mI2cClock = PlatformHob->AhbClk;
+ ASSERT (mI2cClock != 0);
+
+ return EFI_SUCCESS;
+}
--
2.17.1
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