73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* LPC variant I/O for Microchip EC
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*
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* Copyright (C) 2016 Google, Inc
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*/
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#ifndef __CROS_EC_LPC_MEC_H
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#define __CROS_EC_LPC_MEC_H
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enum cros_ec_lpc_mec_emi_access_mode {
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/* 8-bit access */
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ACCESS_TYPE_BYTE = 0x0,
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/* 16-bit access */
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ACCESS_TYPE_WORD = 0x1,
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/* 32-bit access */
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ACCESS_TYPE_LONG = 0x2,
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/*
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* 32-bit access, read or write of MEC_EMI_EC_DATA_B3 causes the
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* EC data register to be incremented.
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*/
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ACCESS_TYPE_LONG_AUTO_INCREMENT = 0x3,
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};
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enum cros_ec_lpc_mec_io_type {
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MEC_IO_READ,
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MEC_IO_WRITE,
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};
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/* EMI registers are relative to base */
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#define MEC_EMI_HOST_TO_EC(MEC_EMI_BASE) ((MEC_EMI_BASE) + 0)
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#define MEC_EMI_EC_TO_HOST(MEC_EMI_BASE) ((MEC_EMI_BASE) + 1)
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#define MEC_EMI_EC_ADDRESS_B0(MEC_EMI_BASE) ((MEC_EMI_BASE) + 2)
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#define MEC_EMI_EC_ADDRESS_B1(MEC_EMI_BASE) ((MEC_EMI_BASE) + 3)
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#define MEC_EMI_EC_DATA_B0(MEC_EMI_BASE) ((MEC_EMI_BASE) + 4)
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#define MEC_EMI_EC_DATA_B1(MEC_EMI_BASE) ((MEC_EMI_BASE) + 5)
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#define MEC_EMI_EC_DATA_B2(MEC_EMI_BASE) ((MEC_EMI_BASE) + 6)
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#define MEC_EMI_EC_DATA_B3(MEC_EMI_BASE) ((MEC_EMI_BASE) + 7)
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/**
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* cros_ec_lpc_mec_init() - Initialize MEC I/O.
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*
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* @base: MEC EMI Base address
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* @end: MEC EMI End address
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*/
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void cros_ec_lpc_mec_init(unsigned int base, unsigned int end);
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/**
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* cros_ec_lpc_mec_in_range() - Determine if addresses are in MEC EMI range.
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*
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* @offset: Address offset
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* @length: Number of bytes to check
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*
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* Return: 1 if in range, 0 if not, and -EINVAL on failure
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* such as the mec range not being initialized
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*/
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int cros_ec_lpc_mec_in_range(unsigned int offset, unsigned int length);
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/**
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* cros_ec_lpc_io_bytes_mec - Read / write bytes to MEC EMI port
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*
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* @io_type: MEC_IO_READ or MEC_IO_WRITE, depending on request
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* @offset: Base read / write address
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* @length: Number of bytes to read / write
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* @buf: Destination / source buffer
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*
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* @return 8-bit checksum of all bytes read / written
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*/
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u8 cros_ec_lpc_io_bytes_mec(enum cros_ec_lpc_mec_io_type io_type,
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unsigned int offset, unsigned int length, u8 *buf);
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#endif /* __CROS_EC_LPC_MEC_H */
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