/* 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 enum cros_ec_lpc_mec_emi_access_mode { /* 8-bit access */ ACCESS_TYPE_BYTE = 0x0, /* 16-bit access */ ACCESS_TYPE_WORD = 0x1, /* 32-bit access */ ACCESS_TYPE_LONG = 0x2, /* * 32-bit access, read or write of MEC_EMI_EC_DATA_B3 causes the * EC data register to be incremented. */ ACCESS_TYPE_LONG_AUTO_INCREMENT = 0x3, }; enum cros_ec_lpc_mec_io_type { MEC_IO_READ, MEC_IO_WRITE, }; /* EMI registers are relative to base */ #define MEC_EMI_HOST_TO_EC(MEC_EMI_BASE) ((MEC_EMI_BASE) + 0) #define MEC_EMI_EC_TO_HOST(MEC_EMI_BASE) ((MEC_EMI_BASE) + 1) #define MEC_EMI_EC_ADDRESS_B0(MEC_EMI_BASE) ((MEC_EMI_BASE) + 2) #define MEC_EMI_EC_ADDRESS_B1(MEC_EMI_BASE) ((MEC_EMI_BASE) + 3) #define MEC_EMI_EC_DATA_B0(MEC_EMI_BASE) ((MEC_EMI_BASE) + 4) #define MEC_EMI_EC_DATA_B1(MEC_EMI_BASE) ((MEC_EMI_BASE) + 5) #define MEC_EMI_EC_DATA_B2(MEC_EMI_BASE) ((MEC_EMI_BASE) + 6) #define MEC_EMI_EC_DATA_B3(MEC_EMI_BASE) ((MEC_EMI_BASE) + 7) /** * 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_destroy * * Cleanup MEC I/O. */ void cros_ec_lpc_mec_destroy(void); /** * 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 8-bit checksum of all bytes read / written */ u8 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 */