/** @file
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Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiPei.h>
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#include <Library/IoLib.h>
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#include <Library/PeiServicesLib.h>
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#include <Platform/MemoryMap.h>
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#include <Ppi/EmbeddedGpio.h>
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#define PDR(x) (SYNQUACER_GPIO_BASE + 4 * (GPIO_PIN (x) >> 3))
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#define DDR(x) (SYNQUACER_GPIO_BASE + 0x10 + 4 * (GPIO_PIN (x) >> 3))
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#define PFR(x) (SYNQUACER_GPIO_BASE + 0x20 + 4 * (GPIO_PIN (x) >> 3))
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#define GPIO_BIT(x) (1U << (GPIO_PIN (x) % 8))
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STATIC CONST UINTN mGpioPinCount = 32;
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/**
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Gets the state of a GPIO pin
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@param This Pointer to protocol
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@param Gpio Which pin to read
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@param Value State of the pin
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@retval EFI_SUCCESS GPIO state returned in Value
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@retval EFI_INVALID_PARAMETER Value is NULL
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@retval EFI_NOT_FOUND Pin does not exit
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**/
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STATIC
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EFI_STATUS
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EFIAPI
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GpioGet (
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IN EMBEDDED_GPIO_PPI *This,
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IN EMBEDDED_GPIO_PIN Gpio,
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OUT UINTN *Value
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)
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{
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if (Value == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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if (GPIO_PORT (Gpio) > 0 || GPIO_PIN (Gpio) >= mGpioPinCount) {
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return EFI_NOT_FOUND;
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}
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*Value = ((MmioRead32 (PDR (GPIO_PIN (Gpio))) & GPIO_BIT (Gpio)) != 0);
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return EFI_SUCCESS;
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}
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/**
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Sets the state of a GPIO pin
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@param This Pointer to protocol
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@param Gpio Which pin to modify
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@param Mode Mode to set
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@retval EFI_SUCCESS GPIO set as requested
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@retval EFI_INVALID_PARAMETER Invalid mode
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@retval EFI_NOT_FOUND Pin does not exit
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**/
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STATIC
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EFI_STATUS
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EFIAPI
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GpioSet (
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IN EMBEDDED_GPIO_PPI *This,
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IN EMBEDDED_GPIO_PIN Gpio,
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IN EMBEDDED_GPIO_MODE Mode
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)
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{
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if (GPIO_PORT (Gpio) > 0 || GPIO_PIN (Gpio) >= mGpioPinCount) {
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return EFI_NOT_FOUND;
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}
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switch (Mode) {
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case GPIO_MODE_INPUT:
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MmioAnd32 (DDR (GPIO_PIN (Gpio)), ~GPIO_BIT (Gpio));
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break;
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case GPIO_MODE_OUTPUT_0:
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MmioOr32 (DDR (GPIO_PIN (Gpio)), GPIO_BIT (Gpio));
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MmioAnd32 (PDR (GPIO_PIN (Gpio)), ~GPIO_BIT (Gpio));
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break;
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case GPIO_MODE_OUTPUT_1:
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MmioOr32 (DDR (GPIO_PIN (Gpio)), GPIO_BIT (Gpio));
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MmioOr32 (PDR (GPIO_PIN (Gpio)), GPIO_BIT (Gpio));
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break;
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default:
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return EFI_INVALID_PARAMETER;
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}
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return EFI_SUCCESS;
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}
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/**
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Gets the mode (function) of a GPIO pin
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@param This Pointer to protocol
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@param Gpio Which pin
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@param Mode Pointer to output mode value
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@retval EFI_SUCCESS Mode value retrieved
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@retval EFI_INVALID_PARAMETER Mode is NULL
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@retval EFI_NOT_FOUND Pin does not exit
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**/
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STATIC
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EFI_STATUS
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EFIAPI
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GpioGetMode (
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IN EMBEDDED_GPIO_PPI *This,
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IN EMBEDDED_GPIO_PIN Gpio,
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OUT EMBEDDED_GPIO_MODE *Mode
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)
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{
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if (Mode == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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if (GPIO_PORT (Gpio) > 0 || GPIO_PIN (Gpio) >= mGpioPinCount) {
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return EFI_NOT_FOUND;
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}
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if (!(MmioRead32 (DDR (GPIO_PIN (Gpio))) & GPIO_BIT (Gpio))) {
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*Mode = GPIO_MODE_INPUT;
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} else if (!(MmioRead32 (PDR (GPIO_PIN (Gpio))) & GPIO_BIT (Gpio))) {
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*Mode = GPIO_MODE_OUTPUT_0;
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} else {
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*Mode = GPIO_MODE_OUTPUT_1;
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}
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return EFI_SUCCESS;
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}
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/**
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Sets the pull-up / pull-down resistor of a GPIO pin
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@param This Pointer to PPI
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@param Gpio Port/pin index
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@param Pull The pullup/pulldown mode to set
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@retval EFI_SUCCESS Mode was set
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@retval EFI_NOT_FOUND Pin does not exist
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@retval EFI_UNSUPPORTED Action not supported
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**/
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STATIC
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EFI_STATUS
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EFIAPI
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GpioSetPull (
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IN EMBEDDED_GPIO_PPI *This,
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IN EMBEDDED_GPIO_PIN Gpio,
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IN EMBEDDED_GPIO_PULL Pull
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)
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{
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if (Pull != GPIO_PULL_NONE) {
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return EFI_UNSUPPORTED;
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}
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if (GPIO_PORT (Gpio) > 0 || GPIO_PIN (Gpio) >= mGpioPinCount) {
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return EFI_NOT_FOUND;
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}
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return EFI_SUCCESS;
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}
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STATIC EMBEDDED_GPIO_PPI mGpioPpi = {
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GpioGet,
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GpioSet,
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GpioGetMode,
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GpioSetPull,
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};
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STATIC CONST EFI_PEI_PPI_DESCRIPTOR mEmbeddedGpioPpiDescriptor = {
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EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
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&gEdkiiEmbeddedGpioPpiGuid,
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&mGpioPpi
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};
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EFI_STATUS
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EFIAPI
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SynQuacerGpioPeiEntryPoint (
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IN EFI_PEI_FILE_HANDLE FfsHeader,
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IN CONST EFI_PEI_SERVICES **PeiServices
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)
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{
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return PeiServicesInstallPpi (&mEmbeddedGpioPpiDescriptor);
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}
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