aboutsummaryrefslogtreecommitdiff
path: root/include/net/caif/caif_hsi.h
blob: bcb9cc3ce98bbb4f95382e9040b056cd035d1677 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
/*
 * Copyright (C) ST-Ericsson AB 2010
 * Contact: Sjur Brendeland / sjur.brandeland@stericsson.com
 * Author:  Daniel Martensson / daniel.martensson@stericsson.com
 *	    Dmitry.Tarnyagin  / dmitry.tarnyagin@stericsson.com
 * License terms: GNU General Public License (GPL) version 2
 */

#ifndef CAIF_HSI_H_
#define CAIF_HSI_H_

#include <net/caif/caif_layer.h>
#include <net/caif/caif_device.h>
#include <linux/atomic.h>

/*
 * Maximum number of CAIF frames that can reside in the same HSI frame.
 */
#define CFHSI_MAX_PKTS 15

/*
 * Maximum number of bytes used for the frame that can be embedded in the
 * HSI descriptor.
 */
#define CFHSI_MAX_EMB_FRM_SZ 96

/*
 * Decides if HSI buffers should be prefilled with 0xFF pattern for easier
 * debugging. Both TX and RX buffers will be filled before the transfer.
 */
#define CFHSI_DBG_PREFILL		0

/* Structure describing a HSI packet descriptor. */
#pragma pack(1) /* Byte alignment. */
struct cfhsi_desc {
	u8 header;
	u8 offset;
	u16 cffrm_len[CFHSI_MAX_PKTS];
	u8 emb_frm[CFHSI_MAX_EMB_FRM_SZ];
};
#pragma pack() /* Default alignment. */

/* Size of the complete HSI packet descriptor. */
#define CFHSI_DESC_SZ (sizeof(struct cfhsi_desc))

/*
 * Size of the complete HSI packet descriptor excluding the optional embedded
 * CAIF frame.
 */
#define CFHSI_DESC_SHORT_SZ (CFHSI_DESC_SZ - CFHSI_MAX_EMB_FRM_SZ)

/*
 * Maximum bytes transferred in one transfer.
 */
#define CFHSI_MAX_CAIF_FRAME_SZ 4096

#define CFHSI_MAX_PAYLOAD_SZ (CFHSI_MAX_PKTS * CFHSI_MAX_CAIF_FRAME_SZ)

/* Size of the complete HSI TX buffer. */
#define CFHSI_BUF_SZ_TX (CFHSI_DESC_SZ + CFHSI_MAX_PAYLOAD_SZ)

/* Size of the complete HSI RX buffer. */
#define CFHSI_BUF_SZ_RX ((2 * CFHSI_DESC_SZ) + CFHSI_MAX_PAYLOAD_SZ)

/* Bitmasks for the HSI descriptor. */
#define CFHSI_PIGGY_DESC		(0x01 << 7)

#define CFHSI_TX_STATE_IDLE			0
#define CFHSI_TX_STATE_XFER			1

#define CFHSI_RX_STATE_DESC			0
#define CFHSI_RX_STATE_PAYLOAD			1

/* Bitmasks for power management. */
#define CFHSI_WAKE_UP				0
#define CFHSI_WAKE_UP_ACK			1
#define CFHSI_WAKE_DOWN_ACK			2
#define CFHSI_AWAKE				3
#define CFHSI_WAKELOCK_HELD			4
#define CFHSI_SHUTDOWN				5
#define CFHSI_FLUSH_FIFO			6

#ifndef CFHSI_INACTIVITY_TOUT
#define CFHSI_INACTIVITY_TOUT			(1 * HZ)
#endif /* CFHSI_INACTIVITY_TOUT */

#ifndef CFHSI_WAKE_TOUT
#define CFHSI_WAKE_TOUT			(3 * HZ)
#endif /* CFHSI_WAKE_TOUT */

#ifndef CFHSI_MAX_RX_RETRIES
#define CFHSI_MAX_RX_RETRIES		(10 * HZ)
#endif

/* Structure implemented by the CAIF HSI driver. */
struct cfhsi_cb_ops {
	void (*tx_done_cb) (struct cfhsi_cb_ops *drv);
	void (*rx_done_cb) (struct cfhsi_cb_ops *drv);
	void (*wake_up_cb) (struct cfhsi_cb_ops *drv);
	void (*wake_down_cb) (struct cfhsi_cb_ops *drv);
};

/* Structure implemented by HSI device. */
struct cfhsi_ops {
	int (*cfhsi_up) (struct cfhsi_ops *dev);
	int (*cfhsi_down) (struct cfhsi_ops *dev);
	int (*cfhsi_tx) (u8 *ptr, int len, struct cfhsi_ops *dev);
	int (*cfhsi_rx) (u8 *ptr, int len, struct cfhsi_ops *dev);
	int (*cfhsi_wake_up) (struct cfhsi_ops *dev);
	int (*cfhsi_wake_down) (struct cfhsi_ops *dev);
	int (*cfhsi_get_peer_wake) (struct cfhsi_ops *dev, bool *status);
	int (*cfhsi_fifo_occupancy) (struct cfhsi_ops *dev, size_t *occupancy);
	int (*cfhsi_rx_cancel)(struct cfhsi_ops *dev);
	struct cfhsi_cb_ops *cb_ops;
};

/* Structure holds status of received CAIF frames processing */
struct cfhsi_rx_state {
	int state;
	int nfrms;
	int pld_len;
	int retries;
	bool piggy_desc;
};

/* Priority mapping */
enum {
	CFHSI_PRIO_CTL = 0,
	CFHSI_PRIO_VI,
	CFHSI_PRIO_VO,
	CFHSI_PRIO_BEBK,
	CFHSI_PRIO_LAST,
};

struct cfhsi_config {
	u32 inactivity_timeout;
	u32 aggregation_timeout;
	u32 head_align;
	u32 tail_align;
	u32 q_high_mark;
	u32 q_low_mark;
};

/* Structure implemented by CAIF HSI drivers. */
struct cfhsi {
	struct caif_dev_common cfdev;
	struct net_device *ndev;
	struct platform_device *pdev;
	struct sk_buff_head qhead[CFHSI_PRIO_LAST];
	struct cfhsi_cb_ops cb_ops;
	struct cfhsi_ops *ops;
	int tx_state;
	struct cfhsi_rx_state rx_state;
	struct cfhsi_config cfg;
	int rx_len;
	u8 *rx_ptr;
	u8 *tx_buf;
	u8 *rx_buf;
	u8 *rx_flip_buf;
	spinlock_t lock;
	int flow_off_sent;
	struct list_head list;
	struct work_struct wake_up_work;
	struct work_struct wake_down_work;
	struct work_struct out_of_sync_work;
	struct workqueue_struct *wq;
	wait_queue_head_t wake_up_wait;
	wait_queue_head_t wake_down_wait;
	wait_queue_head_t flush_fifo_wait;
	struct timer_list inactivity_timer;
	struct timer_list rx_slowpath_timer;

	/* TX aggregation */
	int aggregation_len;
	struct timer_list aggregation_timer;

	unsigned long bits;
};
extern struct platform_driver cfhsi_driver;

/**
 * enum ifla_caif_hsi - CAIF HSI NetlinkRT parameters.
 * @IFLA_CAIF_HSI_INACTIVITY_TOUT: Inactivity timeout before
 *			taking the HSI wakeline down, in milliseconds.
 * When using RT Netlink to create, destroy or configure a CAIF HSI interface,
 * enum ifla_caif_hsi is used to specify the configuration attributes.
 */
enum ifla_caif_hsi {
	__IFLA_CAIF_HSI_UNSPEC,
	__IFLA_CAIF_HSI_INACTIVITY_TOUT,
	__IFLA_CAIF_HSI_AGGREGATION_TOUT,
	__IFLA_CAIF_HSI_HEAD_ALIGN,
	__IFLA_CAIF_HSI_TAIL_ALIGN,
	__IFLA_CAIF_HSI_QHIGH_WATERMARK,
	__IFLA_CAIF_HSI_QLOW_WATERMARK,
	__IFLA_CAIF_HSI_MAX
};

extern struct cfhsi_ops *cfhsi_get_ops(void);

#endif		/* CAIF_HSI_H_ */