55 lines
1.7 KiB
Plaintext
55 lines
1.7 KiB
Plaintext
/*
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* Copyright (c) 2009, ETH Zurich. All rights reserved.
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*
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* This file is distributed under the terms in the attached LICENSE file.
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* If you do not find this file, copies can be found by writing to:
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* ETH Zurich D-INFK, Universitaetstrasse 6, CH-8092 Zurich. Attn: Systems Group.
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*/
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/*
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* acpi_ec.dev
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*
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* DESCRIPTION: ACPI Embedded Controller (EC)
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*
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* This file describes the interface to the ACPI standard embedded controller.
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* See ACPI specification v4.0 section 12.2 (p445).
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*
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* The EC device consists of two 8-bit registers: status/command and data.
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*
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* FIXME: according to the ACPI spec (12.11) the controller may reside in
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* either IO or memory space. This driver assumes IO (because supporting
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* both in Mackerel would be quite clunky).
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*/
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device acpi_ec_mem msbfirst (addr data, addr sc) "ACPI embedded controller" {
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// 12.2.1
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regtype status "Status" {
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_ 1;
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smi_evt 1 "SMI event pending";
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sci_evt 1 "SCI event pending";
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burst 1 "Controller is in burst mode";
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cmd 1 "Byte in data register is a command byte";
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_ 1;
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ibf 1 "Input buffer is full";
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obf 1 "Output buffer is full";
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};
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// 12.3
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constants commands width(8) "Command encodings" {
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read = 0x80 "Read";
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write = 0x81 "Write";
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burst_en = 0x82 "Burst enable";
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burst_dis = 0x83 "Burst disable";
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query = 0x84 "Query";
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};
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// 12.2.1
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register status ro addr(sc, 0) "Status" type(status);
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// 12.2.2
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register cmd wo also addr(sc, 0) "Command" type(commands);
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// 12.2.3
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register data rw addr(data, 0) "Data" type(uint8);
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};
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