eb4ded6925
EC's output could be considered as a queue, and sometimes (observed on Thinkpad T400s during cold boot) a few (only one observed) garbage bytes may detained in such queue after power up. Those garbage bytes should be checked and discarded first before real interactions, otherwise they may disrupt the interaction during EC's enablement, causing a locked rfkill. Change-Id: Iee031306c02f5211a4512c6b4ec90f7f0db196ae Signed-off-by: Bill XIE <persmule@gmail.com> Reviewed-on: https://review.coreboot.org/22180 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Rudolph <siro@das-labor.org>
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2008-2009 coresystems GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _EC_ACPI_H
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#define _EC_ACPI_H
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#include <stdint.h>
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#define EC_DATA 0x62
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#define EC_SC 0x66
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/* EC_SC input */
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#define EC_SMI_EVT (1 << 6) // 1: SMI event pending
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#define EC_SCI_EVT (1 << 5) // 1: SCI event pending
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#define EC_BURST (1 << 4) // controller is in burst mode
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#define EC_CMD (1 << 3) // 1: byte in data register is command
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// 0: byte in data register is data
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#define EC_IBF (1 << 1) // 1: input buffer full (data ready for ec)
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#define EC_OBF (1 << 0) // 1: output buffer full (data ready for host)
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/* EC_SC output */
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#define RD_EC 0x80 // Read Embedded Controller
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#define WR_EC 0x81 // Write Embedded Controller
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#define BE_EC 0x82 // Burst Enable Embedded Controller
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#define BD_EC 0x83 // Burst Disable Embedded Controller
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#define QR_EC 0x84 // Query Embedded Controller
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int send_ec_command(u8 command);
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int send_ec_data(u8 data);
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int send_ec_data_nowait(u8 data);
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u8 recv_ec_data(void);
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void ec_clear_out_queue(void);
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u8 ec_status(void);
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u8 ec_query(void);
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u8 ec_read(u8 addr);
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int ec_write(u8 addr, u8 data);
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void ec_set_bit(u8 addr, u8 bit);
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void ec_clr_bit(u8 addr, u8 bit);
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void ec_set_ports(u16 cmd_reg, u16 data_reg);
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#endif /* _EC_ACPI_H */
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