102 lines
2.0 KiB
C
102 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// LPC interface for ChromeOS Embedded Controller
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//
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// Copyright (C) 2016 Google, Inc
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#include <linux/io.h>
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#include <linux/mfd/cros_ec.h>
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#include <linux/mfd/cros_ec_commands.h>
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#include "cros_ec_lpc_mec.h"
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static u8 lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest)
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{
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int i;
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int sum = 0;
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for (i = 0; i < length; ++i) {
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dest[i] = inb(offset + i);
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sum += dest[i];
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}
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/* Return checksum of all bytes read */
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return sum;
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}
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static u8 lpc_write_bytes(unsigned int offset, unsigned int length, u8 *msg)
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{
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int i;
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int sum = 0;
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for (i = 0; i < length; ++i) {
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outb(msg[i], offset + i);
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sum += msg[i];
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}
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/* Return checksum of all bytes written */
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return sum;
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}
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#ifdef CONFIG_CROS_EC_LPC_MEC
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u8 cros_ec_lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest)
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{
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int in_range = cros_ec_lpc_mec_in_range(offset, length);
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if (in_range < 0)
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return 0;
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return in_range ?
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cros_ec_lpc_io_bytes_mec(MEC_IO_READ,
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offset - EC_HOST_CMD_REGION0,
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length, dest) :
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lpc_read_bytes(offset, length, dest);
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}
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u8 cros_ec_lpc_write_bytes(unsigned int offset, unsigned int length, u8 *msg)
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{
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int in_range = cros_ec_lpc_mec_in_range(offset, length);
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if (in_range < 0)
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return 0;
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return in_range ?
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cros_ec_lpc_io_bytes_mec(MEC_IO_WRITE,
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offset - EC_HOST_CMD_REGION0,
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length, msg) :
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lpc_write_bytes(offset, length, msg);
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}
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void cros_ec_lpc_reg_init(void)
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{
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cros_ec_lpc_mec_init(EC_HOST_CMD_REGION0,
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EC_LPC_ADDR_MEMMAP + EC_MEMMAP_SIZE);
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}
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void cros_ec_lpc_reg_destroy(void)
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{
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cros_ec_lpc_mec_destroy();
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}
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#else /* CONFIG_CROS_EC_LPC_MEC */
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u8 cros_ec_lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest)
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{
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return lpc_read_bytes(offset, length, dest);
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}
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u8 cros_ec_lpc_write_bytes(unsigned int offset, unsigned int length, u8 *msg)
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{
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return lpc_write_bytes(offset, length, msg);
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}
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void cros_ec_lpc_reg_init(void)
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{
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}
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void cros_ec_lpc_reg_destroy(void)
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{
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}
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#endif /* CONFIG_CROS_EC_LPC_MEC */
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