2 * Copyright (c) 2014 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com> and was subsequently ported
6 * to FreeBSD by Michael Gmelin <freebsd@grem.de>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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38 #ifndef _ICHIIC_IG4_VAR_H_
39 #define _ICHIIC_IG4_VAR_H_
42 #include "device_if.h"
44 #include "iicbus_if.h"
46 #define IG4_RBUFSIZE 128
47 #define IG4_RBUFMASK (IG4_RBUFSIZE - 1)
49 enum ig4_op { IG4_IDLE, IG4_READ, IG4_WRITE };
53 struct intr_config_hook enum_hook;
55 struct resource *regs_res;
57 struct resource *intr_res;
65 char rbuf[IG4_RBUFSIZE];
68 int platform_attached : 1;
72 int write_started : 1;
77 * Functions implementing the icbus interface that interact
78 * with the controller acquire an exclusive lock on call_lock
79 * to prevent interleaving of calls to the interface and a lock on
80 * io_lock right afterwards, to synchronize controller I/O activity.
82 * The interrupt handler can only read data while no iicbus call
83 * is in progress or while io_lock is dropped during mtx_sleep in
84 * wait_status and set_controller. It is safe to drop io_lock in those
85 * places, because the interrupt handler only accesses those registers:
87 * - IG4_REG_I2C_STA (I2C Status)
88 * - IG4_REG_DATA_CMD (Data Buffer and Command)
89 * - IG4_REG_CLR_INTR (Clear Interrupt)
91 * Locking outside of those places is required to make the content
92 * of rpos/rnext predictable (e.g. whenever data_read is called and in
99 typedef struct ig4iic_softc ig4iic_softc_t;
101 /* Attach/Detach called from ig4iic_pci_*() */
102 int ig4iic_attach(ig4iic_softc_t *sc);
103 int ig4iic_detach(ig4iic_softc_t *sc);
106 extern iicbus_transfer_t ig4iic_transfer;
107 extern iicbus_reset_t ig4iic_reset;
109 #endif /* _ICHIIC_IG4_VAR_H_ */