/* SPDX-License-Identifier: GPL-2.0 */ /* * LPC variant I/O for Microchip EC * * Copyright (C) 2016 Google, Inc */ #ifndef __CROS_EC_LPC_MEC_H #define __CROS_EC_LPC_MEC_H #include <linux/acpi.h> enum cros_ec_lpc_mec_emi_access_mode { … }; enum cros_ec_lpc_mec_io_type { … }; /* EMI registers are relative to base */ #define MEC_EMI_HOST_TO_EC(MEC_EMI_BASE) … #define MEC_EMI_EC_TO_HOST(MEC_EMI_BASE) … #define MEC_EMI_EC_ADDRESS_B0(MEC_EMI_BASE) … #define MEC_EMI_EC_ADDRESS_B1(MEC_EMI_BASE) … #define MEC_EMI_EC_DATA_B0(MEC_EMI_BASE) … #define MEC_EMI_EC_DATA_B1(MEC_EMI_BASE) … #define MEC_EMI_EC_DATA_B2(MEC_EMI_BASE) … #define MEC_EMI_EC_DATA_B3(MEC_EMI_BASE) … /** * cros_ec_lpc_mec_init() - Initialize MEC I/O. * * @base: MEC EMI Base address * @end: MEC EMI End address */ void cros_ec_lpc_mec_init(unsigned int base, unsigned int end); /** * cros_ec_lpc_mec_acpi_mutex() - Find and set ACPI mutex for MEC * * @adev: Parent ACPI device * @pathname: Name of AML mutex * @return: Negative error code, or zero for success */ int cros_ec_lpc_mec_acpi_mutex(struct acpi_device *adev, const char *pathname); /** * cros_ec_lpc_mec_in_range() - Determine if addresses are in MEC EMI range. * * @offset: Address offset * @length: Number of bytes to check * * Return: 1 if in range, 0 if not, and -EINVAL on failure * such as the mec range not being initialized */ int cros_ec_lpc_mec_in_range(unsigned int offset, unsigned int length); /** * cros_ec_lpc_io_bytes_mec - Read / write bytes to MEC EMI port * * @io_type: MEC_IO_READ or MEC_IO_WRITE, depending on request * @offset: Base read / write address * @length: Number of bytes to read / write * @buf: Destination / source buffer * * @return: A negative error code on error, or 8-bit checksum of all * bytes read / written */ int cros_ec_lpc_io_bytes_mec(enum cros_ec_lpc_mec_io_type io_type, unsigned int offset, unsigned int length, u8 *buf); #endif /* __CROS_EC_LPC_MEC_H */
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