1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2004, 2005 MIPS Technologies, Inc.  All rights reserved.
7 * Copyright (C) 2013 Imagination Technologies Ltd.
8 */
9#ifndef __ASM_RTLX_H_
10#define __ASM_RTLX_H_
11
12#include <irq.h>
13
14#define RTLX_MODULE_NAME "rtlx"
15
16#define LX_NODE_BASE 10
17
18#define MIPS_CPU_RTLX_IRQ 0
19
20#define RTLX_VERSION 2
21#define RTLX_xID 0x12345600
22#define RTLX_ID (RTLX_xID | RTLX_VERSION)
23#define RTLX_BUFFER_SIZE 2048
24#define RTLX_CHANNELS 8
25
26#define RTLX_CHANNEL_STDIO	0
27#define RTLX_CHANNEL_DBG	1
28#define RTLX_CHANNEL_SYSIO	2
29
30void rtlx_starting(int vpe);
31void rtlx_stopping(int vpe);
32
33int rtlx_open(int index, int can_sleep);
34int rtlx_release(int index);
35ssize_t rtlx_read(int index, void __user *buff, size_t count);
36ssize_t rtlx_write(int index, const void __user *buffer, size_t count);
37unsigned int rtlx_read_poll(int index, int can_sleep);
38unsigned int rtlx_write_poll(int index);
39
40int __init rtlx_module_init(void);
41void __exit rtlx_module_exit(void);
42
43void _interrupt_sp(void);
44
45extern struct vpe_notifications rtlx_notify;
46extern const struct file_operations rtlx_fops;
47extern void (*aprp_hook)(void);
48
49enum rtlx_state {
50	RTLX_STATE_UNUSED = 0,
51	RTLX_STATE_INITIALISED,
52	RTLX_STATE_REMOTE_READY,
53	RTLX_STATE_OPENED
54};
55
56extern struct chan_waitqueues {
57	wait_queue_head_t rt_queue;
58	wait_queue_head_t lx_queue;
59	atomic_t in_open;
60	struct mutex mutex;
61} channel_wqs[RTLX_CHANNELS];
62
63/* each channel supports read and write.
64   linux (vpe0) reads lx_buffer and writes rt_buffer
65   SP (vpe1) reads rt_buffer and writes lx_buffer
66*/
67struct rtlx_channel {
68	enum rtlx_state rt_state;
69	enum rtlx_state lx_state;
70
71	int buffer_size;
72
73	/* read and write indexes per buffer */
74	int rt_write, rt_read;
75	char *rt_buffer;
76
77	int lx_write, lx_read;
78	char *lx_buffer;
79};
80
81extern struct rtlx_info {
82	unsigned long id;
83	enum rtlx_state state;
84
85	struct rtlx_channel channel[RTLX_CHANNELS];
86} *rtlx;
87#endif /* __ASM_RTLX_H_ */
88