1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2 /* Copyright (c) 2010-2012 Broadcom. All rights reserved. */
7 /*******************************************************************************
8 * Defines in this first section are part of the VCHI API and may be examined by
10 ******************************************************************************/
13 * Required alignment of base addresses for bulk transfer, if unaligned
14 * transfers are not enabled
15 * Really determined by the message driver, and should be available from
18 #ifndef VCHI_BULK_ALIGN
19 # if __VCCOREVER__ >= 0x04000000
20 # define VCHI_BULK_ALIGN 32 // Allows for the need to do cache cleans
22 # define VCHI_BULK_ALIGN 16
27 * Required length multiple for bulk transfers, if unaligned transfers are
29 * May be less than or greater than VCHI_BULK_ALIGN
30 * Really determined by the message driver, and should be available from
33 #ifndef VCHI_BULK_GRANULARITY
34 # if __VCCOREVER__ >= 0x04000000
35 # define VCHI_BULK_GRANULARITY 32 // Allows for the need to do cache cleans
37 # define VCHI_BULK_GRANULARITY 16
41 /* The largest possible message to be queued with vchi_msg_queue. */
42 #ifndef VCHI_MAX_MSG_SIZE
43 # if defined VCHI_LOCAL_HOST_PORT
44 # define VCHI_MAX_MSG_SIZE 16384 // makes file transfers fast, but should they be using bulk?
46 # define VCHI_MAX_MSG_SIZE 4096 // NOTE: THIS MUST BE LARGER THAN OR EQUAL TO THE SIZE OF THE KHRONOS MERGE BUFFER!!
50 /******************************************************************************
51 * Defines below are system configuration options, and should not be used by
53 ******************************************************************************/
56 * How many connections can we support? A localhost implementation uses
57 * 2 connections, 1 for host-app, 1 for VMCS, and these are hooked together
58 * by a loopback MPHI VCFW driver.
60 #ifndef VCHI_MAX_NUM_CONNECTIONS
61 # define VCHI_MAX_NUM_CONNECTIONS 3
65 * How many services can we open per connection? Extending this doesn't cost
66 * processing time, just a small amount of static memory.
68 #ifndef VCHI_MAX_SERVICES_PER_CONNECTION
69 # define VCHI_MAX_SERVICES_PER_CONNECTION 36
72 /* Adjust if using a message driver that supports more logical TX channels */
73 #ifndef VCHI_MAX_BULK_TX_CHANNELS_PER_CONNECTION
74 # define VCHI_MAX_BULK_TX_CHANNELS_PER_CONNECTION 9 // 1 MPHI + 8 CCP2 logical channels
77 /* Adjust if using a message driver that supports more logical RX channels */
78 #ifndef VCHI_MAX_BULK_RX_CHANNELS_PER_CONNECTION
79 # define VCHI_MAX_BULK_RX_CHANNELS_PER_CONNECTION 1 // 1 MPHI
83 * How many receive slots do we use. This times VCHI_MAX_MSG_SIZE gives the
84 * effective receive queue space, less message headers.
86 #ifndef VCHI_NUM_READ_SLOTS
87 # if defined(VCHI_LOCAL_HOST_PORT)
88 # define VCHI_NUM_READ_SLOTS 4
90 # define VCHI_NUM_READ_SLOTS 48
95 * Do we utilise overrun facility for receive message slots? Can aid peer
96 * transmit performance. Only define on VideoCore end, talking to host.
98 //#define VCHI_MSG_RX_OVERRUN
101 * How many transmit slots do we use. Generally don't need many,
102 * as the hardware driver underneath VCHI will usually have its own buffering.
104 #ifndef VCHI_NUM_WRITE_SLOTS
105 # define VCHI_NUM_WRITE_SLOTS 4
109 * If a service has held or queued received messages in VCHI_XOFF_THRESHOLD or
110 * more slots, then it's taking up too much buffer space,
111 * and the peer service will be told to stop transmitting with an XOFF message.
112 * For this to be effective, the VCHI_NUM_READ_SLOTS needs to be considerably
113 * bigger than VCHI_NUM_WRITE_SLOTS, or the transmit latency is too high.
115 #ifndef VCHI_XOFF_THRESHOLD
116 # define VCHI_XOFF_THRESHOLD (VCHI_NUM_READ_SLOTS / 2)
120 * After we've sent an XOFF, the peer will be told to resume transmission
121 * once the local service has dequeued/released enough messages that it's now
122 * occupying VCHI_XON_THRESHOLD slots or fewer.
124 #ifndef VCHI_XON_THRESHOLD
125 # define VCHI_XON_THRESHOLD (VCHI_NUM_READ_SLOTS / 4)
129 * A size below which a bulk transfer omits the handshake completely and always
130 * goes via the message channel, if bulk auxiliary is being sent on that
131 * service. (The user can guarantee this by enabling unaligned transmits).
134 #ifndef VCHI_MIN_BULK_SIZE
135 # define VCHI_MIN_BULK_SIZE (VCHI_MAX_MSG_SIZE / 2 < 4096 ? VCHI_MAX_MSG_SIZE / 2 : 4096)
139 * Maximum size of bulk transmission chunks, for each interface type.
140 * A trade-off between speed and latency; the smaller the chunk size the better
141 * change of messages and other bulk transmissions getting in when big bulk
142 * transfers are happening. Set to 0 to not break transmissions into chunks.
144 #ifndef VCHI_MAX_BULK_CHUNK_SIZE_MPHI
145 # define VCHI_MAX_BULK_CHUNK_SIZE_MPHI (16 * 1024)
149 * NB Chunked CCP2 transmissions violate the letter of the CCP2 spec
150 * by using "JPEG8" mode with multiple-line frames. Only use if the receiver
153 #ifndef VCHI_MAX_BULK_CHUNK_SIZE_CCP2
154 # define VCHI_MAX_BULK_CHUNK_SIZE_CCP2 0
158 * How many TX messages can we have pending in our transmit slots.
159 * Once exhausted, vchi_msg_queue will be blocked.
161 #ifndef VCHI_TX_MSG_QUEUE_SIZE
162 # define VCHI_TX_MSG_QUEUE_SIZE 256
166 * How many RX messages can we have parsed in the receive slots. Once exhausted,
167 * parsing will be suspended until older messages are dequeued/released.
169 #ifndef VCHI_RX_MSG_QUEUE_SIZE
170 # define VCHI_RX_MSG_QUEUE_SIZE 256
174 * Really should be able to cope if we run out of received message descriptors,
175 * by suspending parsing as the comment above says, but we don't.
176 * This sweeps the issue under the carpet.
178 #if VCHI_RX_MSG_QUEUE_SIZE < (VCHI_MAX_MSG_SIZE / 16 + 1) * VCHI_NUM_READ_SLOTS
179 # undef VCHI_RX_MSG_QUEUE_SIZE
180 # define VCHI_RX_MSG_QUEUE_SIZE ((VCHI_MAX_MSG_SIZE / 16 + 1) * VCHI_NUM_READ_SLOTS)
184 * How many bulk transmits can we have pending. Once exhausted,
185 * vchi_bulk_queue_transmit will be blocked.
187 #ifndef VCHI_TX_BULK_QUEUE_SIZE
188 # define VCHI_TX_BULK_QUEUE_SIZE 64
192 * How many bulk receives can we have pending. Once exhausted,
193 *vchi_bulk_queue_receive will be blocked.
195 #ifndef VCHI_RX_BULK_QUEUE_SIZE
196 # define VCHI_RX_BULK_QUEUE_SIZE 64
200 * A limit on how many outstanding bulk requests we expect the peer to give us.
201 * If the peer asks for more than this, VCHI will fail and assert.
202 * The number is determined by the peer's hardware
203 * - it's the number of outstanding requests that can be queued
204 * on all bulk channels. VC3's MPHI peripheral allows 16.
206 #ifndef VCHI_MAX_PEER_BULK_REQUESTS
207 # define VCHI_MAX_PEER_BULK_REQUESTS 32
211 * Define VCHI_CCP2TX_MANUAL_POWER if the host tells us when to turn the CCP2
212 * transmitter on and off.
214 /*#define VCHI_CCP2TX_MANUAL_POWER*/
216 #ifndef VCHI_CCP2TX_MANUAL_POWER
219 * Timeout (in milliseconds) for putting the CCP2TX interface into IDLE state.
220 * Set negative for no IDLE.
222 # ifndef VCHI_CCP2TX_IDLE_TIMEOUT
223 # define VCHI_CCP2TX_IDLE_TIMEOUT 5
227 * Timeout (in milliseconds) for putting the CCP2TX interface into OFF state.
228 * Set negative for no OFF.
230 # ifndef VCHI_CCP2TX_OFF_TIMEOUT
231 # define VCHI_CCP2TX_OFF_TIMEOUT 1000
234 #endif /* VCHI_CCP2TX_MANUAL_POWER */
236 #endif /* VCHI_CFG_H_ */
238 /****************************** End of file **********************************/