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[2a00:1098:0:86:1000:23:0:2]) by smtp.gmail.com with ESMTPSA id 79sm7353791wmb.7.2019.10.10.08.21.10 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Oct 2019 08:21:11 -0700 (PDT) Resent-From: Leif Lindholm Resent-Date: Thu, 10 Oct 2019 16:21:09 +0100 Resent-Message-ID: <20191010152109.GK25504@bivouac.eciton.net> Resent-To: devel@edk2.groups.io Return-Path: Received: from bivouac.eciton.net (bivouac.eciton.net. [2a00:1098:0:86:1000:23:0:2]) by smtp.gmail.com with ESMTPSA id z125sm7285961wme.37.2019.10.10.07.51.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Oct 2019 07:51:45 -0700 (PDT) Date: Thu, 10 Oct 2019 15:51:43 +0100 From: "Leif Lindholm" To: Meenakshi Aggarwal Cc: ard.biesheuvel@linaro.org, michael.d.kinney@intel.com, edk2-devel@lists.01.org, v.sethi@nxp.com Subject: Re: [PATCH edk2-platforms 06/12] Silicon/NXP: Add support for I2c driver Message-ID: <20191010145143.GE25504@bivouac.eciton.net> References: <1543417315-5763-1-git-send-email-meenakshi.aggarwal@nxp.com> <1570639758-30355-1-git-send-email-meenakshi.aggarwal@nxp.com> <1570639758-30355-7-git-send-email-meenakshi.aggarwal@nxp.com> MIME-Version: 1.0 In-Reply-To: <1570639758-30355-7-git-send-email-meenakshi.aggarwal@nxp.com> User-Agent: Mutt/1.10.1 (2018-07-13) Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Oct 09, 2019 at 10:19:12PM +0530, Meenakshi Aggarwal wrote: > I2C driver produces gEfiI2cMasterProtocolGuid which can be > used by other modules. A few minor comments on this one, inline below. > Signed-off-by: Meenakshi Aggarwal > --- > Silicon/NXP/Drivers/I2cDxe/ComponentName.c | 179 ++++++++ > Silicon/NXP/Drivers/I2cDxe/DriverBinding.c | 235 ++++++++++ > Silicon/NXP/Drivers/I2cDxe/I2cDxe.c | 690 +++++++++++++++++++++++++++++ > Silicon/NXP/Drivers/I2cDxe/I2cDxe.h | 100 +++++ > Silicon/NXP/Drivers/I2cDxe/I2cDxe.inf | 58 +++ > 5 files changed, 1262 insertions(+) > create mode 100644 Silicon/NXP/Drivers/I2cDxe/ComponentName.c > create mode 100644 Silicon/NXP/Drivers/I2cDxe/DriverBinding.c > create mode 100644 Silicon/NXP/Drivers/I2cDxe/I2cDxe.c > create mode 100644 Silicon/NXP/Drivers/I2cDxe/I2cDxe.h > create mode 100644 Silicon/NXP/Drivers/I2cDxe/I2cDxe.inf > > diff --git a/Silicon/NXP/Drivers/I2cDxe/ComponentName.c b/Silicon/NXP/Drivers/I2cDxe/ComponentName.c > new file mode 100644 > index 0000000..a71d75c > --- /dev/null > +++ b/Silicon/NXP/Drivers/I2cDxe/ComponentName.c > @@ -0,0 +1,179 @@ > +/** @file > + > + Copyright 2018-2019 NXP > + > + SPDX-License-Identifier: BSD-2-Clause-Patent > + > +**/ > + > +#include "I2cDxe.h" > + > +STATIC EFI_UNICODE_STRING_TABLE mNxpI2cDriverNameTable[] = { > + { > + "en", > + (CHAR16 *)L"Nxp I2C Driver" This should not need an explicit cast. The type is already (CHAR16 *). > + }, > + { } > +}; > + > +STATIC EFI_UNICODE_STRING_TABLE mNxpI2cControllerNameTable[] = { > + { > + "en", > + (CHAR16 *)L"Nxp I2C Controller" This should not need an explicit cast. The type is already (CHAR16 *). > + }, > + { } > +}; > + > +/** > + Retrieves a Unicode string that is the user readable name of the driver. > + > + This function retrieves the user readable name of a driver in the form of a > + Unicode string. If the driver specified by This has a user readable name in > + the language specified by Language, then a pointer to the driver name is > + returned in DriverName, and EFI_SUCCESS is returned. If the driver specified > + by This does not support the language specified by Language, > + then EFI_UNSUPPORTED is returned. > + > + @param This[in] A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or > + EFI_COMPONENT_NAME_PROTOCOL instance. > + > + @param Language[in] A pointer to a Null-terminated ASCII string > + array indicating the language. This is the > + language of the driver name that the caller is > + requesting, and it must match one of the > + languages specified in SupportedLanguages. The > + number of languages supported by a driver is up > + to the driver writer. Language is specified > + in RFC 4646 or ISO 639-2 language code format. > + > + @param DriverName[out] A pointer to the Unicode string to return. > + This Unicode string is the name of the > + driver specified by This in the language > + specified by Language. > + > + @retval EFI_SUCCESS The Unicode string for the Driver specified by > + This and the language specified by Language was > + returned in DriverName. > + > + @retval EFI_INVALID_PARAMETER Language is NULL. > + > + @retval EFI_INVALID_PARAMETER DriverName is NULL. > + > + @retval EFI_UNSUPPORTED The driver specified by This does not support > + the language specified by Language. > + > +**/ > +STATIC > +EFI_STATUS > +EFIAPI > +NxpI2cGetDriverName ( > + IN EFI_COMPONENT_NAME2_PROTOCOL *This, > + IN CHAR8 *Language, > + OUT CHAR16 **DriverName > + ) > +{ > + return LookupUnicodeString2 (Language, > + This->SupportedLanguages, > + mNxpI2cDriverNameTable, > + DriverName, > + FALSE); > +} > + > +/** > + Retrieves a Unicode string that is the user readable name of the controller > + that is being managed by a driver. > + > + This function retrieves the user readable name of the controller specified by > + ControllerHandle and ChildHandle in the form of a Unicode string. If the > + driver specified by This has a user readable name in the language specified by > + Language, then a pointer to the controller name is returned in ControllerName, > + and EFI_SUCCESS is returned. If the driver specified by This is not currently > + managing the controller specified by ControllerHandle and ChildHandle, > + then EFI_UNSUPPORTED is returned. If the driver specified by This does not > + support the language specified by Language, then EFI_UNSUPPORTED is returned. > + > + @param This[in] A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or > + EFI_COMPONENT_NAME_PROTOCOL instance. > + > + @param ControllerHandle[in] The handle of a controller that the driver > + specified by This is managing. This handle > + specifies the controller whose name is to be > + returned. > + > + @param ChildHandle[in] The handle of the child controller to retrieve > + the name of. This is an optional parameter that > + may be NULL. It will be NULL for device > + drivers. It will also be NULL for a bus drivers > + that wish to retrieve the name of the bus > + controller. It will not be NULL for a bus > + driver that wishes to retrieve the name of a > + child controller. > + > + @param Language[in] A pointer to a Null-terminated ASCII string > + array indicating the language. This is the > + language of the driver name that the caller is > + requesting, and it must match one of the > + languages specified in SupportedLanguages. The > + number of languages supported by a driver is up > + to the driver writer. Language is specified in > + RFC 4646 or ISO 639-2 language code format. > + > + @param ControllerName[out] A pointer to the Unicode string to return. > + This Unicode string is the name of the > + controller specified by ControllerHandle and > + ChildHandle in the language specified by > + Language from the point of view of the driver > + specified by This. > + > + @retval EFI_SUCCESS The Unicode string for the user readable name in > + the language specified by Language for the > + driver specified by This was returned in > + DriverName. > + > + @retval EFI_INVALID_PARAMETER ControllerHandle is NULL. > + > + @retval EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid > + EFI_HANDLE. > + > + @retval EFI_INVALID_PARAMETER Language is NULL. > + > + @retval EFI_INVALID_PARAMETER ControllerName is NULL. > + > + @retval EFI_UNSUPPORTED The driver specified by This is not currently > + managing the controller specified by > + ControllerHandle and ChildHandle. > + > + @retval EFI_UNSUPPORTED The driver specified by This does not support > + the language specified by Language. > + > +**/ > +STATIC > +EFI_STATUS > +EFIAPI > +NxpI2cGetControllerName ( > + IN EFI_COMPONENT_NAME2_PROTOCOL *This, > + IN EFI_HANDLE ControllerHandle, > + IN EFI_HANDLE ChildHandle OPTIONAL, > + IN CHAR8 *Language, > + OUT CHAR16 **ControllerName > + ) > +{ > + if (ChildHandle != NULL) { > + return EFI_UNSUPPORTED; > + } > + > + return LookupUnicodeString2 (Language, > + This->SupportedLanguages, > + mNxpI2cControllerNameTable, > + ControllerName, > + FALSE); > +} > + > +// > +// EFI Component Name 2 Protocol > +// > +EFI_COMPONENT_NAME2_PROTOCOL gNxpI2cDriverComponentName2 = { > + NxpI2cGetDriverName, > + NxpI2cGetControllerName, > + "en" > +}; > diff --git a/Silicon/NXP/Drivers/I2cDxe/DriverBinding.c b/Silicon/NXP/Drivers/I2cDxe/DriverBinding.c > new file mode 100644 > index 0000000..5932044 > --- /dev/null > +++ b/Silicon/NXP/Drivers/I2cDxe/DriverBinding.c > @@ -0,0 +1,235 @@ > +/** @file > + > + Copyright 2018-2019 NXP > + > + SPDX-License-Identifier: BSD-2-Clause-Patent > + > +**/ > + > +#include > +#include > +#include > + > +#include > + > +#include "I2cDxe.h" > + > +/** > + Tests to see if this driver supports a given controller. > + > + @param This[in] A pointer to the EFI_DRIVER_BINDING_PROTOCOL > + instance. > + @param ControllerHandle[in] The handle of the controller to test. > + @param RemainingDevicePath[in] The remaining device path. > + (Ignored - this is not a bus driver.) > + > + @retval EFI_SUCCESS The driver supports this controller. > + @retval EFI_ALREADY_STARTED The device specified by ControllerHandle is > + already being managed by the driver specified > + by This. > + @retval EFI_UNSUPPORTED The device specified by ControllerHandle is > + not supported by the driver specified by This. > + > +**/ > +EFI_STATUS > +EFIAPI > +NxpI2cDriverBindingSupported ( > + IN EFI_DRIVER_BINDING_PROTOCOL *This, > + IN EFI_HANDLE ControllerHandle, > + IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath > + ) > +{ > + NON_DISCOVERABLE_DEVICE *Dev; > + EFI_STATUS Status; > + > + // > + // Connect to the non-discoverable device > + // > + Status = gBS->OpenProtocol (ControllerHandle, > + &gEdkiiNonDiscoverableDeviceProtocolGuid, > + (VOID **) &Dev, > + This->DriverBindingHandle, > + ControllerHandle, > + EFI_OPEN_PROTOCOL_BY_DRIVER); > + if (EFI_ERROR (Status)) { > + return Status; > + } > + > + if (CompareGuid (Dev->Type, &gNxpNonDiscoverableI2cMasterGuid)) { > + Status = EFI_SUCCESS; > + } else { > + Status = EFI_UNSUPPORTED; > + } > + > + // > + // Clean up. > + // > + gBS->CloseProtocol (ControllerHandle, > + &gEdkiiNonDiscoverableDeviceProtocolGuid, > + This->DriverBindingHandle, > + ControllerHandle); > + > + return Status; > +} > + > + > +/** > + Starts a device controller or a bus controller. > + > + @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL > + instance. > + @param[in] ControllerHandle The handle of the device to start. This > + handle must support a protocol interface that > + supplies an I/O abstraction to the driver. > + @param[in] RemainingDevicePath The remaining portion of the device path. > + (Ignored - this is not a bus driver.) > + > + @retval EFI_SUCCESS The device was started. > + @retval EFI_DEVICE_ERROR The device could not be started due to a > + device error. > + @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a > + lack of resources. > + > +**/ > +EFI_STATUS > +EFIAPI > +NxpI2cDriverBindingStart ( > + IN EFI_DRIVER_BINDING_PROTOCOL *This, > + IN EFI_HANDLE ControllerHandle, > + IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL > + ) > +{ > + return NxpI2cInit (This->DriverBindingHandle, ControllerHandle); > +} > + > + > +/** > + Stops a device controller or a bus controller. > + > + @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL > + instance. > + @param[in] ControllerHandle A handle to the device being stopped. The handle > + must support a bus specific I/O protocol for the > + driver to use to stop the device. > + @param[in] NumberOfChildren The number of child device handles in > + ChildHandleBuffer. > + @param[in] ChildHandleBuffer An array of child handles to be freed. May be > + NULL if NumberOfChildren is 0. > + > + @retval EFI_SUCCESS The device was stopped. > + @retval EFI_DEVICE_ERROR The device could not be stopped due to a device > + error. > + > +**/ > +EFI_STATUS > +EFIAPI > +NxpI2cDriverBindingStop ( > + IN EFI_DRIVER_BINDING_PROTOCOL *This, > + IN EFI_HANDLE ControllerHandle, > + IN UINTN NumberOfChildren, > + IN EFI_HANDLE *ChildHandleBuffer OPTIONAL > + ) > +{ > + return NxpI2cRelease (This->DriverBindingHandle, ControllerHandle); > +} > + > + > +STATIC EFI_DRIVER_BINDING_PROTOCOL gNxpI2cDriverBinding = { > + NxpI2cDriverBindingSupported, > + NxpI2cDriverBindingStart, > + NxpI2cDriverBindingStop, > + 0xa, > + NULL, > + NULL > +}; > + > + > +/** > + The entry point of I2c UEFI Driver. > + > + @param ImageHandle The image handle of the UEFI Driver. > + @param SystemTable A pointer to the EFI System Table. > + > + @retval EFI_SUCCESS The Driver or UEFI Driver exited normally. > + @retval EFI_INCOMPATIBLE_VERSION _gUefiDriverRevision is greater than > + SystemTable->Hdr.Revision. > + > +**/ > +EFI_STATUS > +EFIAPI > +I2cDxeEntryPoint ( > + IN EFI_HANDLE ImageHandle, > + IN EFI_SYSTEM_TABLE *SystemTable > + ) > +{ > + EFI_STATUS Status; > + > + // > + // Add the driver to the list of drivers > + // > + Status = EfiLibInstallDriverBindingComponentName2 ( > + ImageHandle, SystemTable, &gNxpI2cDriverBinding, ImageHandle, > + NULL, &gNxpI2cDriverComponentName2); > + ASSERT_EFI_ERROR (Status); > + > + return EFI_SUCCESS; > +} > + > + > +/** > + Unload function for the I2c UEFI Driver. > + > + @param ImageHandle[in] The allocated handle for the EFI image > + > + @retval EFI_SUCCESS The driver was unloaded successfully > + @retval EFI_INVALID_PARAMETER ImageHandle is not a valid image handle. > + > +**/ > +EFI_STATUS > +EFIAPI > +I2cDxeUnload ( > + IN EFI_HANDLE ImageHandle > + ) > +{ > + EFI_STATUS Status; > + EFI_HANDLE *HandleBuffer; > + UINTN HandleCount; > + UINTN Index; > + > + // > + // Retrieve all USB I/O handles in the handle database > + // > + Status = gBS->LocateHandleBuffer (ByProtocol, > + &gEdkiiNonDiscoverableDeviceProtocolGuid, > + NULL, > + &HandleCount, > + &HandleBuffer); > + if (EFI_ERROR (Status)) { > + return Status; > + } > + > + // > + // Disconnect the driver from the handles in the handle database > + // > + for (Index = 0; Index < HandleCount; Index++) { > + Status = gBS->DisconnectController (HandleBuffer[Index], > + gImageHandle, > + NULL); > + } > + > + // > + // Free the handle array > + // > + gBS->FreePool (HandleBuffer); > + > + // > + // Uninstall protocols installed by the driver in its entrypoint > + // > + Status = gBS->UninstallMultipleProtocolInterfaces (ImageHandle, > + &gEfiDriverBindingProtocolGuid, > + &gNxpI2cDriverBinding, > + NULL > + ); > + > + return EFI_SUCCESS; > +} > diff --git a/Silicon/NXP/Drivers/I2cDxe/I2cDxe.c b/Silicon/NXP/Drivers/I2cDxe/I2cDxe.c > new file mode 100644 > index 0000000..7c04b76 > --- /dev/null > +++ b/Silicon/NXP/Drivers/I2cDxe/I2cDxe.c > @@ -0,0 +1,690 @@ > +/** I2cDxe.c > + I2c driver APIs for read, write, initialize, set speed and reset > + > + Copyright 2017-2019 NXP > + > + SPDX-License-Identifier: BSD-2-Clause-Patent > + > +**/ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include "I2cDxe.h" > + > +STATIC CONST CLK_DIV mClkDiv[] = { > + { 20, 0x00 }, { 22, 0x01 }, { 24, 0x02 }, { 26, 0x03 }, > + { 28, 0x04 }, { 30, 0x05 }, { 32, 0x09 }, { 34, 0x06 }, > + { 36, 0x0A }, { 40, 0x07 }, { 44, 0x0C }, { 48, 0x0D }, > + { 52, 0x43 }, { 56, 0x0E }, { 60, 0x45 }, { 64, 0x12 }, > + { 68, 0x0F }, { 72, 0x13 }, { 80, 0x14 }, { 88, 0x15 }, > + { 96, 0x19 }, { 104, 0x16 }, { 112, 0x1A }, { 128, 0x17 }, > + { 136, 0x4F }, { 144, 0x1C }, { 160, 0x1D }, { 176, 0x55 }, > + { 192, 0x1E }, { 208, 0x56 }, { 224, 0x22 }, { 228, 0x24 }, > + { 240, 0x1F }, { 256, 0x23 }, { 288, 0x5C }, { 320, 0x25 }, > + { 384, 0x26 }, { 448, 0x2A }, { 480, 0x27 }, { 512, 0x2B }, > + { 576, 0x2C }, { 640, 0x2D }, { 768, 0x31 }, { 896, 0x32 }, > + { 960, 0x2F }, { 1024, 0x33 }, { 1152, 0x34 }, { 1280, 0x35 }, > + { 1536, 0x36 }, { 1792, 0x3A }, { 1920, 0x37 }, { 2048, 0x3B }, > + { 2304, 0x3C }, { 2560, 0x3D }, { 3072, 0x3E }, { 3584, 0x7A }, > + { 3840, 0x3F }, { 4096, 0x7B }, { 5120, 0x7D }, { 6144, 0x7E } > +}; > + > +/** > + Calculate and return proper clock divider > + > + @param Rate desired clock rate > + > + @retval ClkDiv Index value used to get Bus Clock Rate > + > +**/ > +STATIC > +UINT8 > +GetClkDivIndex ( > + IN UINT32 Rate > + ) > +{ > + UINTN ClkRate; > + UINT32 Div; > + UINT8 Index; > + > + Index = 0; > + ClkRate = GetBusFrequency (); > + > + Div = (ClkRate + Rate - 1) / Rate; > + > + if (Div < mClkDiv[0].SCLDivider) { > + return 0; > + } > + > + do { > + if (mClkDiv[Index].SCLDivider >= Div ) { > + return Index; > + } > + } while (Index < ARRAY_SIZE (mClkDiv)); > + > + return ARRAY_SIZE (mClkDiv) - 1; > +} > + > +/** > + Function used to check if i2c is in mentioned state or not > + > + @param I2cRegs Pointer to I2C registers > + @param State i2c state need to be checked > + > + @retval EFI_NOT_READY Arbitration was lost > + @retval EFI_TIMEOUT Timeout occured > + @retval CurrState Value of state register > + > +**/ > +STATIC > +EFI_STATUS > +WaitForI2cState ( > + IN I2C_REGS *I2cRegs, > + IN UINT32 State > + ) > +{ > + UINT8 CurrState; > + UINT64 Count; > + > + for (Count = 0; Count < I2C_STATE_RETRIES; Count++) { > + MemoryFence (); > + CurrState = MmioRead8 ((UINTN)&I2cRegs->I2cSr); > + if (CurrState & I2C_SR_IAL) { > + MmioWrite8 ((UINTN)&I2cRegs->I2cSr, CurrState | I2C_SR_IAL); > + return EFI_NOT_READY; Indentation funky - both lines should be 2 spaces deeper than if. > + } > + > + if ((CurrState & (State >> 8)) == (UINT8)State) { > + return CurrState; > + } > + } > + > + return EFI_TIMEOUT; > +} > + > +/** > + Function to transfer byte on i2c > + > + @param I2cRegs Pointer to i2c registers > + @param Byte Byte to be transferred on i2c bus > + > + @retval EFI_NOT_READY Arbitration was lost > + @retval EFI_TIMEOUT Timeout occured > + @retval EFI_NOT_FOUND ACK was not recieved > + @retval EFI_SUCCESS Data transfer was succesful > + > +**/ > +STATIC > +EFI_STATUS > +TransferByte ( > + IN I2C_REGS *I2cRegs, > + IN UINT8 Byte > + ) > +{ > + EFI_STATUS RetVal; > + > + MmioWrite8 ((UINTN)&I2cRegs->I2cSr, I2C_SR_IIF_CLEAR); > + MmioWrite8 ((UINTN)&I2cRegs->I2cDr, Byte); > + > + RetVal = WaitForI2cState (I2cRegs, IIF); > + if ((RetVal == EFI_TIMEOUT) || (RetVal == EFI_NOT_READY)) { > + return RetVal; > + } > + > + if (RetVal & I2C_SR_RX_NO_AK) { > + return EFI_NOT_FOUND; > + } > + > + return EFI_SUCCESS; > +} > + > +/** > + Function to stop transaction on i2c bus > + > + @param I2cRegs Pointer to i2c registers > + > + @retval EFI_NOT_READY Arbitration was lost > + @retval EFI_TIMEOUT Timeout occured > + @retval EFI_SUCCESS Stop operation was successful > + > +**/ > +STATIC > +EFI_STATUS > +I2cStop ( > + IN I2C_REGS *I2cRegs > + ) > +{ > + EFI_STATUS RetVal; > + UINT32 Temp; > + > + Temp = MmioRead8 ((UINTN)&I2cRegs->I2cCr); > + > + Temp &= ~(I2C_CR_MSTA | I2C_CR_MTX); > + MmioWrite8 ((UINTN)&I2cRegs->I2cCr, Temp); > + > + RetVal = WaitForI2cState (I2cRegs, BUS_IDLE); > + > + if (RetVal < 0) { > + return RetVal; > + } else { > + return EFI_SUCCESS; > + } > +} > + > +/** > + Function to send start signal, Chip Address and > + memory offset > + > + @param I2cRegs Pointer to i2c base registers > + @param Chip Chip Address > + @param Offset Slave memory's offset > + @param AddressLength length of chip address > + > + @retval EFI_NOT_READY Arbitration lost > + @retval EFI_TIMEOUT Failed to initialize data transfer in predefined time > + @retval EFI_NOT_FOUND ACK was not recieved > + @retval EFI_SUCCESS Read was successful > + > +**/ > +STATIC > +EFI_STATUS > +InitTransfer ( > + IN I2C_REGS *I2cRegs, > + IN UINT8 Chip, > + IN UINT32 Offset, > + IN INT32 AddressLength > + ) > +{ > + UINT32 Temp; > + EFI_STATUS RetVal; > + > + // Enable I2C controller > + if (MmioRead8 ((UINTN)&I2cRegs->I2cCr) & I2C_CR_IDIS) { > + MmioWrite8 ((UINTN)&I2cRegs->I2cCr, I2C_CR_IEN); > + } > + > + if (MmioRead8 ((UINTN)&I2cRegs->I2cAdr) == (Chip << 1)) { > + MmioWrite8 ((UINTN)&I2cRegs->I2cAdr, (Chip << 1) ^ 2); > + } > + > + MmioWrite8 ((UINTN)&I2cRegs->I2cSr, I2C_SR_IIF_CLEAR); > + RetVal = WaitForI2cState (I2cRegs, BUS_IDLE); > + if ((RetVal == EFI_TIMEOUT) || (RetVal == EFI_NOT_READY)) { > + return RetVal; > + } > + > + // Start I2C transaction > + Temp = MmioRead8 ((UINTN)&I2cRegs->I2cCr); > + // set to master mode > + Temp |= I2C_CR_MSTA; > + MmioWrite8 ((UINTN)&I2cRegs->I2cCr, Temp); > + > + RetVal = WaitForI2cState (I2cRegs, BUS_BUSY); > + if ((RetVal == EFI_TIMEOUT) || (RetVal == EFI_NOT_READY)) { > + return RetVal; > + } > + > + Temp |= I2C_CR_MTX | I2C_CR_TX_NO_AK; > + MmioWrite8 ((UINTN)&I2cRegs->I2cCr, Temp); > + > + // write slave Address > + RetVal = TransferByte (I2cRegs, Chip << 1); > + if (RetVal != EFI_SUCCESS) { > + return RetVal; > + } > + > + if (AddressLength >= 0) { > + while (AddressLength--) { > + RetVal = TransferByte (I2cRegs, (Offset >> (AddressLength * 8)) & 0xff); > + if (RetVal != EFI_SUCCESS) > + return RetVal; > + } > + } > + return EFI_SUCCESS; > +} > + > +/** > + Function to check if i2c bus is idle > + > + @param Base Pointer to base address of I2c controller > + > + @retval EFI_SUCCESS > + > +**/ > +STATIC > +INT32 > +I2cBusIdle ( > + IN VOID *Base > + ) > +{ > + return EFI_SUCCESS; > +} > + > +/** > + Function to initiate data transfer on i2c bus > + > + @param I2cRegs Pointer to i2c base registers > + @param Chip Chip Address > + @param Offset Slave memory's offset > + @param AddressLength length of chip address > + > + @retval EFI_NOT_READY Arbitration lost > + @retval EFI_TIMEOUT Failed to initialize data transfer in predefined time > + @retval EFI_NOT_FOUND ACK was not recieved > + @retval EFI_SUCCESS Read was successful > + > +**/ > +STATIC > +EFI_STATUS > +InitDataTransfer ( > + IN I2C_REGS *I2cRegs, > + IN UINT8 Chip, > + IN UINT32 Offset, > + IN INT32 AddressLength > + ) > +{ > + EFI_STATUS RetVal; > + INT32 Retry; > + > + for (Retry = 0; Retry < RETRY_COUNT; Retry++) { > + RetVal = InitTransfer (I2cRegs, Chip, Offset, AddressLength); > + if (RetVal == EFI_SUCCESS) { > + return EFI_SUCCESS; > + } > + > + I2cStop (I2cRegs); > + > + if (EFI_NOT_FOUND == RetVal) { > + return RetVal; > + } > + > + // Disable controller > + if (RetVal != EFI_NOT_READY) { > + MmioWrite8 ((UINTN)&I2cRegs->I2cCr, I2C_CR_IDIS); > + } > + > + if (I2cBusIdle (I2cRegs) < 0) { > + break; > + } > + } > + return RetVal; > +} > + > +/** > + Function to read data using i2c bus > + > + @param BaseAddr I2c Controller Base Address > + @param Chip Address of slave device from where data to be read > + @param Offset Offset of slave memory > + @param AddressLength Address length of slave > + @param Buffer A pointer to the destination buffer for the data > + @param Len Length of data to be read > + > + @retval EFI_NOT_READY Arbitration lost > + @retval EFI_TIMEOUT Failed to initialize data transfer in predefined time > + @retval EFI_NOT_FOUND ACK was not recieved > + @retval EFI_SUCCESS Read was successful > + > +**/ > +STATIC > +EFI_STATUS > +I2cDataRead ( > + IN UINTN BaseAddr, > + IN UINT8 Chip, > + IN UINT32 Offset, > + IN UINT32 AddressLength, > + IN UINT8 *Buffer, > + IN UINT32 Len > + ) > +{ > + EFI_STATUS RetVal; > + UINT32 Temp; > + INT32 I; > + I2C_REGS *I2cRegs; > + > + I2cRegs = (I2C_REGS *)(BaseAddr); > + > + RetVal = InitDataTransfer (I2cRegs, Chip, Offset, AddressLength); > + if (RetVal != EFI_SUCCESS) { > + return RetVal; > + } > + > + Temp = MmioRead8 ((UINTN)&I2cRegs->I2cCr); > + Temp |= I2C_CR_RSTA; > + MmioWrite8 ((UINTN)&I2cRegs->I2cCr, Temp); > + > + RetVal = TransferByte (I2cRegs, (Chip << 1) | 1); > + if (RetVal != EFI_SUCCESS) { > + I2cStop (I2cRegs); > + return RetVal; > + } > + > + // setup bus to read data > + Temp = MmioRead8 ((UINTN)&I2cRegs->I2cCr); > + Temp &= ~(I2C_CR_MTX | I2C_CR_TX_NO_AK); > + if (Len == 1) { > + Temp |= I2C_CR_TX_NO_AK; > + } > + > + MmioWrite8 ((UINTN)&I2cRegs->I2cCr, Temp); > + MmioWrite8 ((UINTN)&I2cRegs->I2cSr, I2C_SR_IIF_CLEAR); > + > + // Dummy Read to initiate recieve operation > + MmioRead8 ((UINTN)&I2cRegs->I2cDr); > + > + for (I = 0; I < Len; I++) { > + RetVal = WaitForI2cState (I2cRegs, IIF); > + if ((RetVal == EFI_TIMEOUT) || (RetVal == EFI_NOT_READY)) { > + I2cStop (I2cRegs); > + return RetVal; > + } > + // > + // It must generate STOP before read I2DR to prevent > + // controller from generating another clock cycle > + // > + if (I == (Len - 1)) { > + I2cStop (I2cRegs); > + } else if (I == (Len - 2)) { > + Temp = MmioRead8 ((UINTN)&I2cRegs->I2cCr); > + Temp |= I2C_CR_TX_NO_AK; > + MmioWrite8 ((UINTN)&I2cRegs->I2cCr, Temp); > + } > + MmioWrite8 ((UINTN)&I2cRegs->I2cSr, I2C_SR_IIF_CLEAR); > + Buffer[I] = MmioRead8 ((UINTN)&I2cRegs->I2cDr); > + } > + > + I2cStop (I2cRegs); > + > + return EFI_SUCCESS; > +} > + > +/** > + Function to write data using i2c bus > + > + @param BaseAddr I2c Controller Base Address > + @param Chip Address of slave device where data to be written > + @param Offset Offset of slave memory > + @param AddressLength Address length of slave > + @param Buffer A pointer to the source buffer for the data > + @param Len Length of data to be write > + > + @retval EFI_NOT_READY Arbitration lost > + @retval EFI_TIMEOUT Failed to initialize data transfer in predefined time > + @retval EFI_NOT_FOUND ACK was not recieved > + @retval EFI_SUCCESS Read was successful > + > +**/ > +STATIC > +EFI_STATUS > +I2cDataWrite ( > + IN UINTN BaseAddr, > + IN UINT8 Chip, > + IN UINT32 Offset, > + IN INT32 AddressLength, > + OUT UINT8 *Buffer, > + IN INT32 Len > + ) > +{ > + EFI_STATUS RetVal; > + I2C_REGS *I2cRegs; > + INT32 I; > + > + I2cRegs = (I2C_REGS *)BaseAddr; > + > + RetVal = InitDataTransfer (I2cRegs, Chip, Offset, AddressLength); > + if (RetVal != EFI_SUCCESS) { > + return RetVal; > + } > + > + // Write operation > + for (I = 0; I < Len; I++) { > + RetVal = TransferByte (I2cRegs, Buffer[I]); > + if (RetVal != EFI_SUCCESS) { > + break; > + } > + } > + > + I2cStop (I2cRegs); > + return RetVal; > +} > + > +/** > + Function to set i2c bus frequency > + > + @param This Pointer to I2c master protocol > + @param BusClockHertz value to be set > + > + @retval EFI_SUCCESS Operation successfull > +**/ > +STATIC > +EFI_STATUS > +EFIAPI > +SetBusFrequency ( > + IN CONST EFI_I2C_MASTER_PROTOCOL *This, > + IN OUT UINTN *BusClockHertz > + ) > +{ > + I2C_REGS *I2cRegs; > + UINT8 ClkId; > + UINT8 SpeedId; > + NXP_I2C_MASTER *I2c; > + > + I2c = NXP_I2C_FROM_THIS (This); > + > + I2cRegs = (I2C_REGS *)(I2c->Dev->Resources[0].AddrRangeMin); > + > + ClkId = GetClkDivIndex (*BusClockHertz); > + SpeedId = mClkDiv[ClkId].BusClockRate; > + > + // Store divider value > + MmioWrite8 ((UINTN)&I2cRegs->I2cFdr, SpeedId); > + > + MemoryFence (); > + > + return EFI_SUCCESS; > +} > + > +/** > + Function to reset I2c Controller > + > + @param This Pointer to I2c master protocol > + > + @return EFI_SUCCESS Operation successfull > +**/ > +STATIC > +EFI_STATUS > +EFIAPI > +Reset ( > + IN CONST EFI_I2C_MASTER_PROTOCOL *This > + ) > +{ > + I2C_REGS *I2cRegs; > + NXP_I2C_MASTER *I2c; > + > + I2c = NXP_I2C_FROM_THIS (This); > + > + I2cRegs = (I2C_REGS *)(I2c->Dev->Resources[0].AddrRangeMin); > + > + // Reset module > + MmioWrite8 ((UINTN)&I2cRegs->I2cCr, I2C_CR_IDIS); > + MmioWrite8 ((UINTN)&I2cRegs->I2cSr, 0); > + > + MemoryFence (); > + > + return EFI_SUCCESS; > +} > + > +STATIC > +EFI_STATUS > +EFIAPI > +StartRequest ( > + IN CONST EFI_I2C_MASTER_PROTOCOL *This, > + IN UINTN SlaveAddress, > + IN EFI_I2C_REQUEST_PACKET *RequestPacket, > + IN EFI_EVENT Event OPTIONAL, > + OUT EFI_STATUS *I2cStatus OPTIONAL > + ) > +{ > + NXP_I2C_MASTER *I2c; > + UINT32 Count; > + INT32 RetVal; > + UINT32 Length; > + UINT8 *Buffer; > + UINT32 Flag; > + UINT32 RegAddress; > + UINT32 OffsetLength; > + > + RegAddress = 0; > + > + I2c = NXP_I2C_FROM_THIS (This); > + > + if (RequestPacket->OperationCount <= 0) { > + DEBUG ((DEBUG_ERROR,"%a: Operation count is not valid %d\n", > + __FUNCTION__, RequestPacket->OperationCount)); > + return EFI_INVALID_PARAMETER; > + } > + > + OffsetLength = RequestPacket->Operation[0].LengthInBytes; > + RegAddress = *RequestPacket->Operation[0].Buffer; > + > + for (Count = 1; Count < RequestPacket->OperationCount; Count++) { > + Flag = RequestPacket->Operation[Count].Flags; > + Length = RequestPacket->Operation[Count].LengthInBytes; > + Buffer = RequestPacket->Operation[Count].Buffer; > + > + if (Length <= 0) { > + DEBUG ((DEBUG_ERROR,"%a: Invalid length of buffer %d\n", > + __FUNCTION__, Length)); > + return EFI_INVALID_PARAMETER; > + } > + > + if (Flag == I2C_FLAG_READ) { > + RetVal = I2cDataRead (I2c->Dev->Resources[0].AddrRangeMin, SlaveAddress, > + RegAddress, OffsetLength, Buffer, Length); Funky indentation. > + if (RetVal != EFI_SUCCESS) { > + DEBUG ((DEBUG_ERROR,"%a: I2c read operation failed (error %d)\n", > + __FUNCTION__, RetVal)); > + return RetVal; > + } > + } else if (Flag == I2C_FLAG_WRITE) { > + RetVal = I2cDataWrite (I2c->Dev->Resources[0].AddrRangeMin, SlaveAddress, > + RegAddress, OffsetLength, Buffer, Length); Funky indentation. > + if (RetVal != EFI_SUCCESS) { > + DEBUG ((DEBUG_ERROR,"%a: I2c write operation failed (error %d)\n", > + __FUNCTION__, RetVal)); > + return RetVal; > + } > + } else { > + DEBUG ((DEBUG_ERROR,"%a: Invalid Flag %d\n", > + __FUNCTION__, Flag)); > + return EFI_INVALID_PARAMETER; > + } > + } > + > + return EFI_SUCCESS; > +} > + > +STATIC CONST EFI_I2C_CONTROLLER_CAPABILITIES I2cControllerCapabilities = { STATIC global variables should have 'm' prefix, and be defined before all functions. / Leif > + 0, > + 0, > + 0, > + 0 > +}; > + > +EFI_STATUS > +NxpI2cInit ( > + IN EFI_HANDLE DriverBindingHandle, > + IN EFI_HANDLE ControllerHandle > + ) > +{ > + EFI_STATUS RetVal; > + NON_DISCOVERABLE_DEVICE *Dev; > + NXP_I2C_MASTER *I2c; > + > + RetVal = gBS->OpenProtocol (ControllerHandle, > + &gEdkiiNonDiscoverableDeviceProtocolGuid, > + (VOID **)&Dev, DriverBindingHandle, > + ControllerHandle, EFI_OPEN_PROTOCOL_BY_DRIVER); > + if (EFI_ERROR (RetVal)) { > + return RetVal; > + } > + > + I2c = AllocateZeroPool (sizeof (NXP_I2C_MASTER)); > + > + I2c->Signature = NXP_I2C_SIGNATURE; > + I2c->I2cMaster.SetBusFrequency = SetBusFrequency; > + I2c->I2cMaster.Reset = Reset; > + I2c->I2cMaster.StartRequest = StartRequest; > + I2c->I2cMaster.I2cControllerCapabilities = &I2cControllerCapabilities; > + I2c->Dev = Dev; > + > + CopyGuid (&I2c->DevicePath.Vendor.Guid, &gEfiCallerIdGuid); > + I2c->DevicePath.MmioBase = I2c->Dev->Resources[0].AddrRangeMin; > + SetDevicePathNodeLength (&I2c->DevicePath.Vendor, > + sizeof (I2c->DevicePath) - sizeof (I2c->DevicePath.End)); > + SetDevicePathEndNode (&I2c->DevicePath.End); > + > + RetVal = gBS->InstallMultipleProtocolInterfaces (&ControllerHandle, > + &gEfiI2cMasterProtocolGuid, (VOID**)&I2c->I2cMaster, > + &gEfiDevicePathProtocolGuid, &I2c->DevicePath, > + NULL); > + > + if (EFI_ERROR (RetVal)) { > + FreePool (I2c); > + gBS->CloseProtocol (ControllerHandle, > + &gEdkiiNonDiscoverableDeviceProtocolGuid, > + DriverBindingHandle, > + ControllerHandle); > + } > + > + return RetVal; > +} > + > +EFI_STATUS > +NxpI2cRelease ( > + IN EFI_HANDLE DriverBindingHandle, > + IN EFI_HANDLE ControllerHandle > + ) > +{ > + EFI_I2C_MASTER_PROTOCOL *I2cMaster; > + EFI_STATUS RetVal; > + NXP_I2C_MASTER *I2c; > + > + RetVal = gBS->HandleProtocol (ControllerHandle, > + &gEfiI2cMasterProtocolGuid, > + (VOID **)&I2cMaster); > + ASSERT_EFI_ERROR (RetVal); > + if (EFI_ERROR (RetVal)) { > + return RetVal; > + } > + > + I2c = NXP_I2C_FROM_THIS (I2cMaster); > + > + RetVal = gBS->UninstallMultipleProtocolInterfaces (ControllerHandle, > + &gEfiI2cMasterProtocolGuid, I2cMaster, > + &gEfiDevicePathProtocolGuid, &I2c->DevicePath, > + NULL); > + if (EFI_ERROR (RetVal)) { > + return RetVal; > + } > + > + RetVal = gBS->CloseProtocol (ControllerHandle, > + &gEdkiiNonDiscoverableDeviceProtocolGuid, > + DriverBindingHandle, > + ControllerHandle); > + ASSERT_EFI_ERROR (RetVal); > + if (EFI_ERROR (RetVal)) { > + return RetVal; > + } > + > + gBS->FreePool (I2c); > + > + return EFI_SUCCESS; > +} > diff --git a/Silicon/NXP/Drivers/I2cDxe/I2cDxe.h b/Silicon/NXP/Drivers/I2cDxe/I2cDxe.h > new file mode 100644 > index 0000000..02a29a5 > --- /dev/null > +++ b/Silicon/NXP/Drivers/I2cDxe/I2cDxe.h > @@ -0,0 +1,100 @@ > +/** I2cDxe.h > + Header defining the constant, base address amd function for I2C controller > + > + Copyright 2017-2019 NXP > + > + SPDX-License-Identifier: BSD-2-Clause-Patent > + > +**/ > + > +#ifndef I2C_DXE_H_ > +#define I2C_DXE_H_ > + > +#include > +#include > + > +#include > +#include > + > +#define I2C_CR_IIEN (1 << 6) > +#define I2C_CR_MSTA (1 << 5) > +#define I2C_CR_MTX (1 << 4) > +#define I2C_CR_TX_NO_AK (1 << 3) > +#define I2C_CR_RSTA (1 << 2) > + > +#define I2C_SR_ICF (1 << 7) > +#define I2C_SR_IBB (1 << 5) > +#define I2C_SR_IAL (1 << 4) > +#define I2C_SR_IIF (1 << 1) > +#define I2C_SR_RX_NO_AK (1 << 0) > + > +#define I2C_CR_IEN (0 << 7) > +#define I2C_CR_IDIS (1 << 7) > +#define I2C_SR_IIF_CLEAR (1 << 1) > + > +#define BUS_IDLE (0 | (I2C_SR_IBB << 8)) > +#define BUS_BUSY (I2C_SR_IBB | (I2C_SR_IBB << 8)) > +#define IIF (I2C_SR_IIF | (I2C_SR_IIF << 8)) > + > +#define I2C_FLAG_WRITE 0x0 > + > +#define I2C_STATE_RETRIES 50000 > + > +#define RETRY_COUNT 3 > + > +#define NXP_I2C_SIGNATURE SIGNATURE_32 ('N', 'I', '2', 'C') > +#define NXP_I2C_FROM_THIS(a) CR ((a), NXP_I2C_MASTER, \ > + I2cMaster, NXP_I2C_SIGNATURE) > + > +extern EFI_COMPONENT_NAME2_PROTOCOL gNxpI2cDriverComponentName2; > + > +#pragma pack(1) > +typedef struct { > + VENDOR_DEVICE_PATH Vendor; > + UINT64 MmioBase; > + EFI_DEVICE_PATH_PROTOCOL End; > +} NXP_I2C_DEVICE_PATH; > +#pragma pack() > + > +typedef struct { > + UINT32 Signature; > + EFI_I2C_MASTER_PROTOCOL I2cMaster; > + NXP_I2C_DEVICE_PATH DevicePath; > + NON_DISCOVERABLE_DEVICE *Dev; > +} NXP_I2C_MASTER; > + > +/** > + Record defining i2c registers > +**/ > +typedef struct { > + UINT8 I2cAdr; > + UINT8 I2cFdr; > + UINT8 I2cCr; > + UINT8 I2cSr; > + UINT8 I2cDr; > +} I2C_REGS; > + > +typedef struct { > + UINT16 SCLDivider; > + UINT16 BusClockRate; > +} CLK_DIV; > + > +extern > +UINT64 > +GetBusFrequency ( > + VOID > + ); > + > +EFI_STATUS > +NxpI2cInit ( > + IN EFI_HANDLE DriverBindingHandle, > + IN EFI_HANDLE ControllerHandle > + ); > + > +EFI_STATUS > +NxpI2cRelease ( > + IN EFI_HANDLE DriverBindingHandle, > + IN EFI_HANDLE ControllerHandle > + ); > + > +#endif //I2C_DXE_H_ > diff --git a/Silicon/NXP/Drivers/I2cDxe/I2cDxe.inf b/Silicon/NXP/Drivers/I2cDxe/I2cDxe.inf > new file mode 100644 > index 0000000..0c0bf63 > --- /dev/null > +++ b/Silicon/NXP/Drivers/I2cDxe/I2cDxe.inf > @@ -0,0 +1,58 @@ > +# @file > +# > +# Component description file for I2c driver > +# > +# Copyright (c) 2015, Freescale Semiconductor, Inc. All rights reserved. > +# Copyright 2017-2019 NXP > +# > +# SPDX-License-Identifier: BSD-2-Clause-Patent > +# > +# > + > +[Defines] > + INF_VERSION = 0x0001001A > + BASE_NAME = I2cDxe > + FILE_GUID = 5f2927ba-1b04-4d5f-8bef-2b50c635d1e7 > + MODULE_TYPE = DXE_DRIVER > + VERSION_STRING = 1.0 > + ENTRY_POINT = I2cDxeEntryPoint > + UNLOAD = I2cDxeUnload > + > +[Sources.common] > + ComponentName.c > + DriverBinding.c > + I2cDxe.c > + > +[LibraryClasses] > + ArmLib > + BaseMemoryLib > + DevicePathLib > + IoLib > + MemoryAllocationLib > + PcdLib > + SocLib > + TimerLib > + UefiBootServicesTableLib > + UefiDriverEntryPoint > + UefiLib > + > +[Guids] > + gNxpNonDiscoverableI2cMasterGuid > + > +[Packages] > + MdeModulePkg/MdeModulePkg.dec > + MdePkg/MdePkg.dec > + Silicon/NXP/NxpQoriqLs.dec > + > +[Protocols] > + gEdkiiNonDiscoverableDeviceProtocolGuid ## TO_START > + gEfiI2cMasterProtocolGuid ## BY_START > + > +[Pcd] > + gNxpQoriqLsTokenSpaceGuid.PcdI2cSpeed > + gNxpQoriqLsTokenSpaceGuid.PcdI2c0BaseAddr > + gNxpQoriqLsTokenSpaceGuid.PcdI2cSize > + gNxpQoriqLsTokenSpaceGuid.PcdNumI2cController > + > +[Depex] > + TRUE > -- > 1.9.1 >