6 * Copyright (C) 1999 Andreas E. Bombe
8 * This code is licensed under the GPL. See the file COPYING in the root
9 * directory of the kernel sources for details.
12 #include <linux/bitops.h>
13 #include <linux/compiler.h>
14 #include <linux/hardirq.h>
15 #include <linux/spinlock.h>
16 #include <linux/string.h>
17 #include <linux/sched.h> /* because linux/wait.h is broken if CONFIG_SMP=n */
18 #include <linux/wait.h>
21 #include <asm/errno.h>
22 #include <asm/system.h>
25 #include "ieee1394_types.h"
27 #include "ieee1394_core.h"
28 #include "ieee1394_transactions.h"
30 #define PREP_ASYNC_HEAD_ADDRESS(tc) \
32 packet->header[0] = (packet->node_id << 16) | (packet->tlabel << 10) \
33 | (1 << 8) | (tc << 4); \
34 packet->header[1] = (packet->host->node_id << 16) | (addr >> 32); \
35 packet->header[2] = addr & 0xffffffff
37 #ifndef HPSB_DEBUG_TLABELS
40 DEFINE_SPINLOCK(hpsb_tlabel_lock
);
42 static DECLARE_WAIT_QUEUE_HEAD(tlabel_wq
);
44 static void fill_async_readquad(struct hpsb_packet
*packet
, u64 addr
)
46 PREP_ASYNC_HEAD_ADDRESS(TCODE_READQ
);
47 packet
->header_size
= 12;
48 packet
->data_size
= 0;
49 packet
->expect_response
= 1;
52 static void fill_async_readblock(struct hpsb_packet
*packet
, u64 addr
,
55 PREP_ASYNC_HEAD_ADDRESS(TCODE_READB
);
56 packet
->header
[3] = length
<< 16;
57 packet
->header_size
= 16;
58 packet
->data_size
= 0;
59 packet
->expect_response
= 1;
62 static void fill_async_writequad(struct hpsb_packet
*packet
, u64 addr
,
65 PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEQ
);
66 packet
->header
[3] = data
;
67 packet
->header_size
= 16;
68 packet
->data_size
= 0;
69 packet
->expect_response
= 1;
72 static void fill_async_writeblock(struct hpsb_packet
*packet
, u64 addr
,
75 PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEB
);
76 packet
->header
[3] = length
<< 16;
77 packet
->header_size
= 16;
78 packet
->expect_response
= 1;
79 packet
->data_size
= length
+ (length
% 4 ? 4 - (length
% 4) : 0);
82 static void fill_async_lock(struct hpsb_packet
*packet
, u64 addr
, int extcode
,
85 PREP_ASYNC_HEAD_ADDRESS(TCODE_LOCK_REQUEST
);
86 packet
->header
[3] = (length
<< 16) | extcode
;
87 packet
->header_size
= 16;
88 packet
->data_size
= length
;
89 packet
->expect_response
= 1;
92 static void fill_phy_packet(struct hpsb_packet
*packet
, quadlet_t data
)
94 packet
->header
[0] = data
;
95 packet
->header
[1] = ~data
;
96 packet
->header_size
= 8;
97 packet
->data_size
= 0;
98 packet
->expect_response
= 0;
99 packet
->type
= hpsb_raw
; /* No CRC added */
100 packet
->speed_code
= IEEE1394_SPEED_100
; /* Force speed to be 100Mbps */
103 static void fill_async_stream_packet(struct hpsb_packet
*packet
, int length
,
104 int channel
, int tag
, int sync
)
106 packet
->header
[0] = (length
<< 16) | (tag
<< 14) | (channel
<< 8)
107 | (TCODE_STREAM_DATA
<< 4) | sync
;
109 packet
->header_size
= 4;
110 packet
->data_size
= length
;
111 packet
->type
= hpsb_async
;
112 packet
->tcode
= TCODE_ISO_DATA
;
115 /* same as hpsb_get_tlabel, except that it returns immediately */
116 static int hpsb_get_tlabel_atomic(struct hpsb_packet
*packet
)
118 unsigned long flags
, *tp
;
120 int tlabel
, n
= NODEID_TO_NODE(packet
->node_id
);
122 /* Broadcast transactions are complete once the request has been sent.
123 * Use the same transaction label for all broadcast transactions. */
124 if (unlikely(n
== ALL_NODES
)) {
128 tp
= packet
->host
->tl_pool
[n
].map
;
129 next
= &packet
->host
->next_tl
[n
];
131 spin_lock_irqsave(&hpsb_tlabel_lock
, flags
);
132 tlabel
= find_next_zero_bit(tp
, 64, *next
);
134 tlabel
= find_first_zero_bit(tp
, 64);
136 spin_unlock_irqrestore(&hpsb_tlabel_lock
, flags
);
139 __set_bit(tlabel
, tp
);
140 *next
= (tlabel
+ 1) & 63;
141 spin_unlock_irqrestore(&hpsb_tlabel_lock
, flags
);
143 packet
->tlabel
= tlabel
;
148 * hpsb_get_tlabel - allocate a transaction label
149 * @packet: the packet whose tlabel and tl_pool we set
151 * Every asynchronous transaction on the 1394 bus needs a transaction
152 * label to match the response to the request. This label has to be
153 * different from any other transaction label in an outstanding request to
154 * the same node to make matching possible without ambiguity.
156 * There are 64 different tlabels, so an allocated tlabel has to be freed
157 * with hpsb_free_tlabel() after the transaction is complete (unless it's
158 * reused again for the same target node).
160 * Return value: Zero on success, otherwise non-zero. A non-zero return
161 * generally means there are no available tlabels. If this is called out
162 * of interrupt or atomic context, then it will sleep until can return a
163 * tlabel or a signal is received.
165 int hpsb_get_tlabel(struct hpsb_packet
*packet
)
167 if (irqs_disabled() || in_atomic())
168 return hpsb_get_tlabel_atomic(packet
);
170 /* NB: The macro wait_event_interruptible() is called with a condition
171 * argument with side effect. This is only possible because the side
172 * effect does not occur until the condition became true, and
173 * wait_event_interruptible() won't evaluate the condition again after
175 return wait_event_interruptible(tlabel_wq
,
176 !hpsb_get_tlabel_atomic(packet
));
180 * hpsb_free_tlabel - free an allocated transaction label
181 * @packet: packet whose tlabel and tl_pool needs to be cleared
183 * Frees the transaction label allocated with hpsb_get_tlabel(). The
184 * tlabel has to be freed after the transaction is complete (i.e. response
185 * was received for a split transaction or packet was sent for a unified
188 * A tlabel must not be freed twice.
190 void hpsb_free_tlabel(struct hpsb_packet
*packet
)
192 unsigned long flags
, *tp
;
193 int tlabel
, n
= NODEID_TO_NODE(packet
->node_id
);
195 if (unlikely(n
== ALL_NODES
))
197 tp
= packet
->host
->tl_pool
[n
].map
;
198 tlabel
= packet
->tlabel
;
199 BUG_ON(tlabel
> 63 || tlabel
< 0);
201 spin_lock_irqsave(&hpsb_tlabel_lock
, flags
);
202 BUG_ON(!__test_and_clear_bit(tlabel
, tp
));
203 spin_unlock_irqrestore(&hpsb_tlabel_lock
, flags
);
205 wake_up_interruptible(&tlabel_wq
);
209 * hpsb_packet_success - Make sense of the ack and reply codes
211 * Make sense of the ack and reply codes and return more convenient error codes:
212 * 0 = success. -%EBUSY = node is busy, try again. -%EAGAIN = error which can
213 * probably resolved by retry. -%EREMOTEIO = node suffers from an internal
214 * error. -%EACCES = this transaction is not allowed on requested address.
215 * -%EINVAL = invalid address at node.
217 int hpsb_packet_success(struct hpsb_packet
*packet
)
219 switch (packet
->ack_code
) {
221 switch ((packet
->header
[1] >> 12) & 0xf) {
224 case RCODE_CONFLICT_ERROR
:
226 case RCODE_DATA_ERROR
:
228 case RCODE_TYPE_ERROR
:
230 case RCODE_ADDRESS_ERROR
:
233 HPSB_ERR("received reserved rcode %d from node %d",
234 (packet
->header
[1] >> 12) & 0xf,
248 if (packet
->tcode
== TCODE_WRITEQ
249 || packet
->tcode
== TCODE_WRITEB
) {
252 HPSB_ERR("impossible ack_complete from node %d "
253 "(tcode %d)", packet
->node_id
, packet
->tcode
);
258 if (packet
->tcode
== TCODE_WRITEB
259 || packet
->tcode
== TCODE_LOCK_REQUEST
) {
262 HPSB_ERR("impossible ack_data_error from node %d "
263 "(tcode %d)", packet
->node_id
, packet
->tcode
);
267 case ACK_ADDRESS_ERROR
:
271 case ACK_CONFLICT_ERROR
:
273 case ACKX_SEND_ERROR
:
276 /* error while sending */
280 HPSB_ERR("got invalid ack %d from node %d (tcode %d)",
281 packet
->ack_code
, packet
->node_id
, packet
->tcode
);
286 struct hpsb_packet
*hpsb_make_readpacket(struct hpsb_host
*host
, nodeid_t node
,
287 u64 addr
, size_t length
)
289 struct hpsb_packet
*packet
;
294 packet
= hpsb_alloc_packet(length
);
299 packet
->node_id
= node
;
301 if (hpsb_get_tlabel(packet
)) {
302 hpsb_free_packet(packet
);
307 fill_async_readquad(packet
, addr
);
309 fill_async_readblock(packet
, addr
, length
);
314 struct hpsb_packet
*hpsb_make_writepacket(struct hpsb_host
*host
, nodeid_t node
,
315 u64 addr
, quadlet_t
* buffer
,
318 struct hpsb_packet
*packet
;
323 packet
= hpsb_alloc_packet(length
);
327 if (length
% 4) { /* zero padding bytes */
328 packet
->data
[length
>> 2] = 0;
331 packet
->node_id
= node
;
333 if (hpsb_get_tlabel(packet
)) {
334 hpsb_free_packet(packet
);
339 fill_async_writequad(packet
, addr
, buffer
? *buffer
: 0);
341 fill_async_writeblock(packet
, addr
, length
);
343 memcpy(packet
->data
, buffer
, length
);
349 struct hpsb_packet
*hpsb_make_streampacket(struct hpsb_host
*host
, u8
* buffer
,
350 int length
, int channel
, int tag
,
353 struct hpsb_packet
*packet
;
358 packet
= hpsb_alloc_packet(length
);
362 if (length
% 4) { /* zero padding bytes */
363 packet
->data
[length
>> 2] = 0;
367 /* Because it is too difficult to determine all PHY speeds and link
368 * speeds here, we use S100... */
369 packet
->speed_code
= IEEE1394_SPEED_100
;
371 /* ...and prevent hpsb_send_packet() from overriding it. */
372 packet
->node_id
= LOCAL_BUS
| ALL_NODES
;
374 if (hpsb_get_tlabel(packet
)) {
375 hpsb_free_packet(packet
);
379 fill_async_stream_packet(packet
, length
, channel
, tag
, sync
);
381 memcpy(packet
->data
, buffer
, length
);
386 struct hpsb_packet
*hpsb_make_lockpacket(struct hpsb_host
*host
, nodeid_t node
,
387 u64 addr
, int extcode
,
388 quadlet_t
* data
, quadlet_t arg
)
390 struct hpsb_packet
*p
;
393 p
= hpsb_alloc_packet(8);
399 if (hpsb_get_tlabel(p
)) {
405 case EXTCODE_FETCH_ADD
:
406 case EXTCODE_LITTLE_ADD
:
419 fill_async_lock(p
, addr
, extcode
, length
);
424 struct hpsb_packet
*hpsb_make_lock64packet(struct hpsb_host
*host
,
425 nodeid_t node
, u64 addr
, int extcode
,
426 octlet_t
* data
, octlet_t arg
)
428 struct hpsb_packet
*p
;
431 p
= hpsb_alloc_packet(16);
437 if (hpsb_get_tlabel(p
)) {
443 case EXTCODE_FETCH_ADD
:
444 case EXTCODE_LITTLE_ADD
:
447 p
->data
[0] = *data
>> 32;
448 p
->data
[1] = *data
& 0xffffffff;
454 p
->data
[0] = arg
>> 32;
455 p
->data
[1] = arg
& 0xffffffff;
456 p
->data
[2] = *data
>> 32;
457 p
->data
[3] = *data
& 0xffffffff;
461 fill_async_lock(p
, addr
, extcode
, length
);
466 struct hpsb_packet
*hpsb_make_phypacket(struct hpsb_host
*host
, quadlet_t data
)
468 struct hpsb_packet
*p
;
470 p
= hpsb_alloc_packet(0);
475 fill_phy_packet(p
, data
);
481 * FIXME - these functions should probably read from / write to user space to
482 * avoid in kernel buffers for user space callers
486 * hpsb_read - generic read function
488 * Recognizes the local node ID and act accordingly. Automatically uses a
489 * quadlet read request if @length == 4 and and a block read request otherwise.
490 * It does not yet support lengths that are not a multiple of 4.
492 * You must explicitly specifiy the @generation for which the node ID is valid,
493 * to avoid sending packets to the wrong nodes when we race with a bus reset.
495 int hpsb_read(struct hpsb_host
*host
, nodeid_t node
, unsigned int generation
,
496 u64 addr
, quadlet_t
* buffer
, size_t length
)
498 struct hpsb_packet
*packet
;
504 packet
= hpsb_make_readpacket(host
, node
, addr
, length
);
510 packet
->generation
= generation
;
511 retval
= hpsb_send_packet_and_wait(packet
);
515 retval
= hpsb_packet_success(packet
);
519 *buffer
= packet
->header
[3];
521 memcpy(buffer
, packet
->data
, length
);
526 hpsb_free_tlabel(packet
);
527 hpsb_free_packet(packet
);
533 * hpsb_write - generic write function
535 * Recognizes the local node ID and act accordingly. Automatically uses a
536 * quadlet write request if @length == 4 and and a block write request
537 * otherwise. It does not yet support lengths that are not a multiple of 4.
539 * You must explicitly specifiy the @generation for which the node ID is valid,
540 * to avoid sending packets to the wrong nodes when we race with a bus reset.
542 int hpsb_write(struct hpsb_host
*host
, nodeid_t node
, unsigned int generation
,
543 u64 addr
, quadlet_t
* buffer
, size_t length
)
545 struct hpsb_packet
*packet
;
551 packet
= hpsb_make_writepacket(host
, node
, addr
, buffer
, length
);
556 packet
->generation
= generation
;
557 retval
= hpsb_send_packet_and_wait(packet
);
559 goto hpsb_write_fail
;
561 retval
= hpsb_packet_success(packet
);
564 hpsb_free_tlabel(packet
);
565 hpsb_free_packet(packet
);
570 int hpsb_lock(struct hpsb_host
*host
, nodeid_t node
, unsigned int generation
,
571 u64 addr
, int extcode
, quadlet_t
*data
, quadlet_t arg
)
573 struct hpsb_packet
*packet
;
576 packet
= hpsb_make_lockpacket(host
, node
, addr
, extcode
, data
, arg
);
580 packet
->generation
= generation
;
581 retval
= hpsb_send_packet_and_wait(packet
);
585 retval
= hpsb_packet_success(packet
);
588 *data
= packet
->data
[0];
591 hpsb_free_tlabel(packet
);
592 hpsb_free_packet(packet
);
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