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1da177e4 LT |
1 | /* |
2 | * IEEE 1394 for Linux | |
3 | * | |
4 | * kernel ISO transmission/reception | |
5 | * | |
6 | * Copyright (C) 2002 Maas Digital LLC | |
7 | * | |
8 | * This code is licensed under the GPL. See the file COPYING in the root | |
9 | * directory of the kernel sources for details. | |
10 | */ | |
11 | ||
12 | #ifndef IEEE1394_ISO_H | |
13 | #define IEEE1394_ISO_H | |
14 | ||
de4394f1 | 15 | #include <linux/spinlock_types.h> |
612262a5 | 16 | #include <linux/wait.h> |
de4394f1 SR |
17 | #include <asm/atomic.h> |
18 | #include <asm/types.h> | |
19 | ||
1da177e4 LT |
20 | #include "dma.h" |
21 | ||
de4394f1 SR |
22 | struct hpsb_host; |
23 | ||
1da177e4 LT |
24 | /* high-level ISO interface */ |
25 | ||
e1d118f1 SR |
26 | /* |
27 | * This API sends and receives isochronous packets on a large, | |
28 | * virtually-contiguous kernel memory buffer. The buffer may be mapped | |
29 | * into a user-space process for zero-copy transmission and reception. | |
30 | * | |
31 | * There are no explicit boundaries between packets in the buffer. A | |
32 | * packet may be transmitted or received at any location. However, | |
33 | * low-level drivers may impose certain restrictions on alignment or | |
34 | * size of packets. (e.g. in OHCI no packet may cross a page boundary, | |
35 | * and packets should be quadlet-aligned) | |
36 | */ | |
1da177e4 LT |
37 | |
38 | /* Packet descriptor - the API maintains a ring buffer of these packet | |
e1d118f1 | 39 | * descriptors in kernel memory (hpsb_iso.infos[]). */ |
1da177e4 LT |
40 | struct hpsb_iso_packet_info { |
41 | /* offset of data payload relative to the first byte of the buffer */ | |
42 | __u32 offset; | |
43 | ||
e1d118f1 SR |
44 | /* length of the data payload, in bytes (not including the isochronous |
45 | * header) */ | |
1da177e4 LT |
46 | __u16 len; |
47 | ||
e1d118f1 SR |
48 | /* (recv only) the cycle number (mod 8000) on which the packet was |
49 | * received */ | |
1da177e4 LT |
50 | __u16 cycle; |
51 | ||
52 | /* (recv only) channel on which the packet was received */ | |
53 | __u8 channel; | |
54 | ||
55 | /* 2-bit 'tag' and 4-bit 'sy' fields of the isochronous header */ | |
56 | __u8 tag; | |
57 | __u8 sy; | |
1934b8b6 | 58 | |
e1d118f1 SR |
59 | /* length in bytes of the packet including header/trailer. |
60 | * MUST be at structure end, since the first part of this structure is | |
61 | * also defined in raw1394.h (i.e. struct raw1394_iso_packet_info), is | |
62 | * copied to userspace and is accessed there through libraw1394. */ | |
1934b8b6 | 63 | __u16 total_len; |
1da177e4 LT |
64 | }; |
65 | ||
66 | enum hpsb_iso_type { HPSB_ISO_RECV = 0, HPSB_ISO_XMIT = 1 }; | |
67 | ||
68 | /* The mode of the dma when receiving iso data. Must be supported by chip */ | |
69 | enum raw1394_iso_dma_recv_mode { | |
70 | HPSB_ISO_DMA_DEFAULT = -1, | |
71 | HPSB_ISO_DMA_OLD_ABI = 0, | |
72 | HPSB_ISO_DMA_BUFFERFILL = 1, | |
73 | HPSB_ISO_DMA_PACKET_PER_BUFFER = 2 | |
74 | }; | |
75 | ||
76 | struct hpsb_iso { | |
77 | enum hpsb_iso_type type; | |
78 | ||
79 | /* pointer to low-level driver and its private data */ | |
80 | struct hpsb_host *host; | |
81 | void *hostdata; | |
82 | ||
83 | /* a function to be called (from interrupt context) after | |
e1d118f1 SR |
84 | * outgoing packets have been sent, or incoming packets have |
85 | * arrived */ | |
1da177e4 LT |
86 | void (*callback)(struct hpsb_iso*); |
87 | ||
88 | /* wait for buffer space */ | |
89 | wait_queue_head_t waitq; | |
90 | ||
91 | int speed; /* IEEE1394_SPEED_100, 200, or 400 */ | |
92 | int channel; /* -1 if multichannel */ | |
93 | int dma_mode; /* dma receive mode */ | |
94 | ||
95 | ||
96 | /* greatest # of packets between interrupts - controls | |
e1d118f1 | 97 | * the maximum latency of the buffer */ |
1da177e4 LT |
98 | int irq_interval; |
99 | ||
100 | /* the buffer for packet data payloads */ | |
101 | struct dma_region data_buf; | |
102 | ||
103 | /* size of data_buf, in bytes (always a multiple of PAGE_SIZE) */ | |
104 | unsigned int buf_size; | |
105 | ||
106 | /* # of packets in the ringbuffer */ | |
107 | unsigned int buf_packets; | |
108 | ||
109 | /* protects packet cursors */ | |
110 | spinlock_t lock; | |
111 | ||
112 | /* the index of the next packet that will be produced | |
113 | or consumed by the user */ | |
114 | int first_packet; | |
115 | ||
116 | /* the index of the next packet that will be transmitted | |
117 | or received by the 1394 hardware */ | |
118 | int pkt_dma; | |
119 | ||
120 | /* how many packets, starting at first_packet: | |
e1d118f1 SR |
121 | * (transmit) are ready to be filled with data |
122 | * (receive) contain received data */ | |
1da177e4 LT |
123 | int n_ready_packets; |
124 | ||
125 | /* how many times the buffer has overflowed or underflowed */ | |
126 | atomic_t overflows; | |
cc9429bc PP |
127 | /* how many cycles were skipped for a given context */ |
128 | atomic_t skips; | |
1da177e4 | 129 | |
1934b8b6 BC |
130 | /* Current number of bytes lost in discarded packets */ |
131 | int bytes_discarded; | |
132 | ||
1da177e4 LT |
133 | /* private flags to track initialization progress */ |
134 | #define HPSB_ISO_DRIVER_INIT (1<<0) | |
135 | #define HPSB_ISO_DRIVER_STARTED (1<<1) | |
136 | unsigned int flags; | |
137 | ||
138 | /* # of packets left to prebuffer (xmit only) */ | |
139 | int prebuffer; | |
140 | ||
141 | /* starting cycle for DMA (xmit only) */ | |
142 | int start_cycle; | |
143 | ||
144 | /* cycle at which next packet will be transmitted, | |
e1d118f1 | 145 | * -1 if not known */ |
1da177e4 LT |
146 | int xmit_cycle; |
147 | ||
148 | /* ringbuffer of packet descriptors in regular kernel memory | |
149 | * XXX Keep this last, since we use over-allocated memory from | |
150 | * this entry to fill this field. */ | |
151 | struct hpsb_iso_packet_info *infos; | |
152 | }; | |
153 | ||
154 | /* functions available to high-level drivers (e.g. raw1394) */ | |
155 | ||
1da177e4 LT |
156 | struct hpsb_iso* hpsb_iso_xmit_init(struct hpsb_host *host, |
157 | unsigned int data_buf_size, | |
158 | unsigned int buf_packets, | |
159 | int channel, | |
160 | int speed, | |
161 | int irq_interval, | |
162 | void (*callback)(struct hpsb_iso*)); | |
1da177e4 LT |
163 | struct hpsb_iso* hpsb_iso_recv_init(struct hpsb_host *host, |
164 | unsigned int data_buf_size, | |
165 | unsigned int buf_packets, | |
166 | int channel, | |
167 | int dma_mode, | |
168 | int irq_interval, | |
169 | void (*callback)(struct hpsb_iso*)); | |
1da177e4 LT |
170 | int hpsb_iso_recv_listen_channel(struct hpsb_iso *iso, unsigned char channel); |
171 | int hpsb_iso_recv_unlisten_channel(struct hpsb_iso *iso, unsigned char channel); | |
172 | int hpsb_iso_recv_set_channel_mask(struct hpsb_iso *iso, u64 mask); | |
e1d118f1 SR |
173 | int hpsb_iso_xmit_start(struct hpsb_iso *iso, int start_on_cycle, |
174 | int prebuffer); | |
175 | int hpsb_iso_recv_start(struct hpsb_iso *iso, int start_on_cycle, | |
176 | int tag_mask, int sync); | |
1da177e4 | 177 | void hpsb_iso_stop(struct hpsb_iso *iso); |
1da177e4 | 178 | void hpsb_iso_shutdown(struct hpsb_iso *iso); |
e1d118f1 SR |
179 | int hpsb_iso_xmit_queue_packet(struct hpsb_iso *iso, u32 offset, u16 len, |
180 | u8 tag, u8 sy); | |
1da177e4 | 181 | int hpsb_iso_xmit_sync(struct hpsb_iso *iso); |
afd6546d SR |
182 | int hpsb_iso_recv_release_packets(struct hpsb_iso *recv, |
183 | unsigned int n_packets); | |
1da177e4 | 184 | int hpsb_iso_recv_flush(struct hpsb_iso *iso); |
1da177e4 LT |
185 | int hpsb_iso_n_ready(struct hpsb_iso *iso); |
186 | ||
187 | /* the following are callbacks available to low-level drivers */ | |
188 | ||
1da177e4 | 189 | void hpsb_iso_packet_sent(struct hpsb_iso *iso, int cycle, int error); |
1da177e4 | 190 | void hpsb_iso_packet_received(struct hpsb_iso *iso, u32 offset, u16 len, |
e1d118f1 SR |
191 | u16 total_len, u16 cycle, u8 channel, u8 tag, |
192 | u8 sy); | |
1da177e4 LT |
193 | void hpsb_iso_wake(struct hpsb_iso *iso); |
194 | ||
195 | #endif /* IEEE1394_ISO_H */ |