1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * LPC variant I/O for Microchip EC 4 * 5 * Copyright (C) 2016 Google, Inc 6 */ 7 8 #ifndef __CROS_EC_LPC_MEC_H 9 #define __CROS_EC_LPC_MEC_H 10 11 enum cros_ec_lpc_mec_emi_access_mode { 12 /* 8-bit access */ 13 ACCESS_TYPE_BYTE = 0x0, 14 /* 16-bit access */ 15 ACCESS_TYPE_WORD = 0x1, 16 /* 32-bit access */ 17 ACCESS_TYPE_LONG = 0x2, 18 /* 19 * 32-bit access, read or write of MEC_EMI_EC_DATA_B3 causes the 20 * EC data register to be incremented. 21 */ 22 ACCESS_TYPE_LONG_AUTO_INCREMENT = 0x3, 23 }; 24 25 enum cros_ec_lpc_mec_io_type { 26 MEC_IO_READ, 27 MEC_IO_WRITE, 28 }; 29 30 /* EMI registers are relative to base */ 31 #define MEC_EMI_HOST_TO_EC(MEC_EMI_BASE) ((MEC_EMI_BASE) + 0) 32 #define MEC_EMI_EC_TO_HOST(MEC_EMI_BASE) ((MEC_EMI_BASE) + 1) 33 #define MEC_EMI_EC_ADDRESS_B0(MEC_EMI_BASE) ((MEC_EMI_BASE) + 2) 34 #define MEC_EMI_EC_ADDRESS_B1(MEC_EMI_BASE) ((MEC_EMI_BASE) + 3) 35 #define MEC_EMI_EC_DATA_B0(MEC_EMI_BASE) ((MEC_EMI_BASE) + 4) 36 #define MEC_EMI_EC_DATA_B1(MEC_EMI_BASE) ((MEC_EMI_BASE) + 5) 37 #define MEC_EMI_EC_DATA_B2(MEC_EMI_BASE) ((MEC_EMI_BASE) + 6) 38 #define MEC_EMI_EC_DATA_B3(MEC_EMI_BASE) ((MEC_EMI_BASE) + 7) 39 40 /** 41 * cros_ec_lpc_mec_init() - Initialize MEC I/O. 42 * 43 * @base: MEC EMI Base address 44 * @end: MEC EMI End address 45 */ 46 void cros_ec_lpc_mec_init(unsigned int base, unsigned int end); 47 48 /** 49 * cros_ec_lpc_mec_in_range() - Determine if addresses are in MEC EMI range. 50 * 51 * @offset: Address offset 52 * @length: Number of bytes to check 53 * 54 * Return: 1 if in range, 0 if not, and -EINVAL on failure 55 * such as the mec range not being initialized 56 */ 57 int cros_ec_lpc_mec_in_range(unsigned int offset, unsigned int length); 58 59 /** 60 * cros_ec_lpc_io_bytes_mec - Read / write bytes to MEC EMI port 61 * 62 * @io_type: MEC_IO_READ or MEC_IO_WRITE, depending on request 63 * @offset: Base read / write address 64 * @length: Number of bytes to read / write 65 * @buf: Destination / source buffer 66 * 67 * @return 8-bit checksum of all bytes read / written 68 */ 69 u8 cros_ec_lpc_io_bytes_mec(enum cros_ec_lpc_mec_io_type io_type, 70 unsigned int offset, unsigned int length, u8 *buf); 71 72 #endif /* __CROS_EC_LPC_MEC_H */ 73