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79 lines
2.2 KiB
79 lines
2.2 KiB
/* 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_destroy |
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* |
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* Cleanup MEC I/O. |
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*/ |
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void cros_ec_lpc_mec_destroy(void); |
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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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