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[BNX2]: Use msleep().
[linux-2.6/verdex.git] / drivers / ieee1394 / ohci1394.c
blob5667c8102efc0dcc56d14a786e602a7437ab4596
1 /*
2 * ohci1394.c - driver for OHCI 1394 boards
3 * Copyright (C)1999,2000 Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>
4 * Gord Peters <GordPeters@smarttech.com>
5 * 2001 Ben Collins <bcollins@debian.org>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software Foundation,
19 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 */
21
22 /*
23 * Things known to be working:
24 * . Async Request Transmit
25 * . Async Response Receive
26 * . Async Request Receive
27 * . Async Response Transmit
28 * . Iso Receive
29 * . DMA mmap for iso receive
30 * . Config ROM generation
31 *
32 * Things implemented, but still in test phase:
33 * . Iso Transmit
34 * . Async Stream Packets Transmit (Receive done via Iso interface)
35 *
36 * Things not implemented:
37 * . DMA error recovery
38 *
39 * Known bugs:
40 * . devctl BUS_RESET arg confusion (reset type or root holdoff?)
41 * added LONG_RESET_ROOT and SHORT_RESET_ROOT for root holdoff --kk
42 */
43
44 /*
45 * Acknowledgments:
46 *
47 * Adam J Richter <adam@yggdrasil.com>
48 * . Use of pci_class to find device
49 *
50 * Emilie Chung <emilie.chung@axis.com>
51 * . Tip on Async Request Filter
52 *
53 * Pascal Drolet <pascal.drolet@informission.ca>
54 * . Various tips for optimization and functionnalities
55 *
56 * Robert Ficklin <rficklin@westengineering.com>
57 * . Loop in irq_handler
58 *
59 * James Goodwin <jamesg@Filanet.com>
60 * . Various tips on initialization, self-id reception, etc.
61 *
62 * Albrecht Dress <ad@mpifr-bonn.mpg.de>
63 * . Apple PowerBook detection
64 *
65 * Daniel Kobras <daniel.kobras@student.uni-tuebingen.de>
66 * . Reset the board properly before leaving + misc cleanups
67 *
68 * Leon van Stuivenberg <leonvs@iae.nl>
69 * . Bug fixes
70 *
71 * Ben Collins <bcollins@debian.org>
72 * . Working big-endian support
73 * . Updated to 2.4.x module scheme (PCI aswell)
74 * . Config ROM generation
75 *
76 * Manfred Weihs <weihs@ict.tuwien.ac.at>
77 * . Reworked code for initiating bus resets
78 * (long, short, with or without hold-off)
79 *
80 * Nandu Santhi <contactnandu@users.sourceforge.net>
81 * . Added support for nVidia nForce2 onboard Firewire chipset
82 *
83 */
84
85 #include <linux/kernel.h>
86 #include <linux/list.h>
87 #include <linux/slab.h>
88 #include <linux/interrupt.h>
89 #include <linux/wait.h>
90 #include <linux/errno.h>
91 #include <linux/module.h>
92 #include <linux/moduleparam.h>
93 #include <linux/pci.h>
94 #include <linux/fs.h>
95 #include <linux/poll.h>
96 #include <asm/byteorder.h>
97 #include <asm/atomic.h>
98 #include <asm/uaccess.h>
99 #include <linux/delay.h>
100 #include <linux/spinlock.h>
101
102 #include <asm/pgtable.h>
103 #include <asm/page.h>
104 #include <asm/irq.h>
105 #include <linux/types.h>
106 #include <linux/vmalloc.h>
107 #include <linux/init.h>
108
109 #ifdef CONFIG_PPC_PMAC
110 #include <asm/machdep.h>
111 #include <asm/pmac_feature.h>
112 #include <asm/prom.h>
113 #include <asm/pci-bridge.h>
114 #endif
115
116 #include "csr1212.h"
117 #include "ieee1394.h"
118 #include "ieee1394_types.h"
119 #include "hosts.h"
120 #include "dma.h"
121 #include "iso.h"
122 #include "ieee1394_core.h"
123 #include "highlevel.h"
124 #include "ohci1394.h"
125
126 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
127 #define OHCI1394_DEBUG
128 #endif
129
130 #ifdef DBGMSG
131 #undef DBGMSG
132 #endif
133
134 #ifdef OHCI1394_DEBUG
135 #define DBGMSG(fmt, args...) \
136 printk(KERN_INFO "%s: fw-host%d: " fmt "\n" , OHCI1394_DRIVER_NAME, ohci->host->id , ## args)
137 #else
138 #define DBGMSG(fmt, args...) do {} while (0)
139 #endif
140
141 /* print general (card independent) information */
142 #define PRINT_G(level, fmt, args...) \
143 printk(level "%s: " fmt "\n" , OHCI1394_DRIVER_NAME , ## args)
144
145 /* print card specific information */
146 #define PRINT(level, fmt, args...) \
147 printk(level "%s: fw-host%d: " fmt "\n" , OHCI1394_DRIVER_NAME, ohci->host->id , ## args)
148
149 /* Module Parameters */
150 static int phys_dma = 1;
151 module_param(phys_dma, int, 0444);
152 MODULE_PARM_DESC(phys_dma, "Enable physical dma (default = 1).");
153
154 static void dma_trm_tasklet(unsigned long data);
155 static void dma_trm_reset(struct dma_trm_ctx *d);
156
157 static int alloc_dma_rcv_ctx(struct ti_ohci *ohci, struct dma_rcv_ctx *d,
158 enum context_type type, int ctx, int num_desc,
159 int buf_size, int split_buf_size, int context_base);
160 static void free_dma_rcv_ctx(struct dma_rcv_ctx *d);
161
162 static int alloc_dma_trm_ctx(struct ti_ohci *ohci, struct dma_trm_ctx *d,
163 enum context_type type, int ctx, int num_desc,
164 int context_base);
165
166 static void ohci1394_pci_remove(struct pci_dev *pdev);
167
168 #ifndef __LITTLE_ENDIAN
169 static const size_t hdr_sizes[] = {
170 3, /* TCODE_WRITEQ */
171 4, /* TCODE_WRITEB */
172 3, /* TCODE_WRITE_RESPONSE */
173 0, /* reserved */
174 3, /* TCODE_READQ */
175 4, /* TCODE_READB */
176 3, /* TCODE_READQ_RESPONSE */
177 4, /* TCODE_READB_RESPONSE */
178 1, /* TCODE_CYCLE_START */
179 4, /* TCODE_LOCK_REQUEST */
180 2, /* TCODE_ISO_DATA */
181 4, /* TCODE_LOCK_RESPONSE */
182 /* rest is reserved or link-internal */
183 };
184
185 static inline void header_le32_to_cpu(quadlet_t *data, unsigned char tcode)
186 {
187 size_t size;
188
189 if (unlikely(tcode >= ARRAY_SIZE(hdr_sizes)))
190 return;
191
192 size = hdr_sizes[tcode];
193 while (size--)
194 data[size] = le32_to_cpu(data[size]);
195 }
196 #else
197 #define header_le32_to_cpu(w,x) do {} while (0)
198 #endif /* !LITTLE_ENDIAN */
199
200 /***********************************
201 * IEEE-1394 functionality section *
202 ***********************************/
203
204 static u8 get_phy_reg(struct ti_ohci *ohci, u8 addr)
205 {
206 int i;
207 unsigned long flags;
208 quadlet_t r;
209
210 spin_lock_irqsave (&ohci->phy_reg_lock, flags);
211
212 reg_write(ohci, OHCI1394_PhyControl, (addr << 8) | 0x00008000);
213
214 for (i = 0; i < OHCI_LOOP_COUNT; i++) {
215 if (reg_read(ohci, OHCI1394_PhyControl) & 0x80000000)
216 break;
217
218 mdelay(1);
219 }
220
221 r = reg_read(ohci, OHCI1394_PhyControl);
222
223 if (i >= OHCI_LOOP_COUNT)
224 PRINT (KERN_ERR, "Get PHY Reg timeout [0x%08x/0x%08x/%d]",
225 r, r & 0x80000000, i);
226
227 spin_unlock_irqrestore (&ohci->phy_reg_lock, flags);
228
229 return (r & 0x00ff0000) >> 16;
230 }
231
232 static void set_phy_reg(struct ti_ohci *ohci, u8 addr, u8 data)
233 {
234 int i;
235 unsigned long flags;
236 u32 r = 0;
237
238 spin_lock_irqsave (&ohci->phy_reg_lock, flags);
239
240 reg_write(ohci, OHCI1394_PhyControl, (addr << 8) | data | 0x00004000);
241
242 for (i = 0; i < OHCI_LOOP_COUNT; i++) {
243 r = reg_read(ohci, OHCI1394_PhyControl);
244 if (!(r & 0x00004000))
245 break;
246
247 mdelay(1);
248 }
249
250 if (i == OHCI_LOOP_COUNT)
251 PRINT (KERN_ERR, "Set PHY Reg timeout [0x%08x/0x%08x/%d]",
252 r, r & 0x00004000, i);
253
254 spin_unlock_irqrestore (&ohci->phy_reg_lock, flags);
255
256 return;
257 }
258
259 /* Or's our value into the current value */
260 static void set_phy_reg_mask(struct ti_ohci *ohci, u8 addr, u8 data)
261 {
262 u8 old;
263
264 old = get_phy_reg (ohci, addr);
265 old |= data;
266 set_phy_reg (ohci, addr, old);
267
268 return;
269 }
270
271 static void handle_selfid(struct ti_ohci *ohci, struct hpsb_host *host,
272 int phyid, int isroot)
273 {
274 quadlet_t *q = ohci->selfid_buf_cpu;
275 quadlet_t self_id_count=reg_read(ohci, OHCI1394_SelfIDCount);
276 size_t size;
277 quadlet_t q0, q1;
278
279 /* Check status of self-id reception */
280
281 if (ohci->selfid_swap)
282 q0 = le32_to_cpu(q[0]);
283 else
284 q0 = q[0];
285
286 if ((self_id_count & 0x80000000) ||
287 ((self_id_count & 0x00FF0000) != (q0 & 0x00FF0000))) {
288 PRINT(KERN_ERR,
289 "Error in reception of SelfID packets [0x%08x/0x%08x] (count: %d)",
290 self_id_count, q0, ohci->self_id_errors);
291
292 /* Tip by James Goodwin <jamesg@Filanet.com>:
293 * We had an error, generate another bus reset in response. */
294 if (ohci->self_id_errors<OHCI1394_MAX_SELF_ID_ERRORS) {
295 set_phy_reg_mask (ohci, 1, 0x40);
296 ohci->self_id_errors++;
297 } else {
298 PRINT(KERN_ERR,
299 "Too many errors on SelfID error reception, giving up!");
300 }
301 return;
302 }
303
304 /* SelfID Ok, reset error counter. */
305 ohci->self_id_errors = 0;
306
307 size = ((self_id_count & 0x00001FFC) >> 2) - 1;
308 q++;
309
310 while (size > 0) {
311 if (ohci->selfid_swap) {
312 q0 = le32_to_cpu(q[0]);
313 q1 = le32_to_cpu(q[1]);
314 } else {
315 q0 = q[0];
316 q1 = q[1];
317 }
318
319 if (q0 == ~q1) {
320 DBGMSG ("SelfID packet 0x%x received", q0);
321 hpsb_selfid_received(host, cpu_to_be32(q0));
322 if (((q0 & 0x3f000000) >> 24) == phyid)
323 DBGMSG ("SelfID for this node is 0x%08x", q0);
324 } else {
325 PRINT(KERN_ERR,
326 "SelfID is inconsistent [0x%08x/0x%08x]", q0, q1);
327 }
328 q += 2;
329 size -= 2;
330 }
331
332 DBGMSG("SelfID complete");
333
334 return;
335 }
336
337 static void ohci_soft_reset(struct ti_ohci *ohci) {
338 int i;
339
340 reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_softReset);
341
342 for (i = 0; i < OHCI_LOOP_COUNT; i++) {
343 if (!(reg_read(ohci, OHCI1394_HCControlSet) & OHCI1394_HCControl_softReset))
344 break;
345 mdelay(1);
346 }
347 DBGMSG ("Soft reset finished");
348 }
349
350
351 /* Generate the dma receive prgs and start the context */
352 static void initialize_dma_rcv_ctx(struct dma_rcv_ctx *d, int generate_irq)
353 {
354 struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
355 int i;
356
357 ohci1394_stop_context(ohci, d->ctrlClear, NULL);
358
359 for (i=0; i<d->num_desc; i++) {
360 u32 c;
361
362 c = DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE | DMA_CTL_BRANCH;
363 if (generate_irq)
364 c |= DMA_CTL_IRQ;
365
366 d->prg_cpu[i]->control = cpu_to_le32(c | d->buf_size);
367
368 /* End of descriptor list? */
369 if (i + 1 < d->num_desc) {
370 d->prg_cpu[i]->branchAddress =
371 cpu_to_le32((d->prg_bus[i+1] & 0xfffffff0) | 0x1);
372 } else {
373 d->prg_cpu[i]->branchAddress =
374 cpu_to_le32((d->prg_bus[0] & 0xfffffff0));
375 }
376
377 d->prg_cpu[i]->address = cpu_to_le32(d->buf_bus[i]);
378 d->prg_cpu[i]->status = cpu_to_le32(d->buf_size);
379 }
380
381 d->buf_ind = 0;
382 d->buf_offset = 0;
383
384 if (d->type == DMA_CTX_ISO) {
385 /* Clear contextControl */
386 reg_write(ohci, d->ctrlClear, 0xffffffff);
387
388 /* Set bufferFill, isochHeader, multichannel for IR context */
389 reg_write(ohci, d->ctrlSet, 0xd0000000);
390
391 /* Set the context match register to match on all tags */
392 reg_write(ohci, d->ctxtMatch, 0xf0000000);
393
394 /* Clear the multi channel mask high and low registers */
395 reg_write(ohci, OHCI1394_IRMultiChanMaskHiClear, 0xffffffff);
396 reg_write(ohci, OHCI1394_IRMultiChanMaskLoClear, 0xffffffff);
397
398 /* Set up isoRecvIntMask to generate interrupts */
399 reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1 << d->ctx);
400 }
401
402 /* Tell the controller where the first AR program is */
403 reg_write(ohci, d->cmdPtr, d->prg_bus[0] | 0x1);
404
405 /* Run context */
406 reg_write(ohci, d->ctrlSet, 0x00008000);
407
408 DBGMSG("Receive DMA ctx=%d initialized", d->ctx);
409 }
410
411 /* Initialize the dma transmit context */
412 static void initialize_dma_trm_ctx(struct dma_trm_ctx *d)
413 {
414 struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
415
416 /* Stop the context */
417 ohci1394_stop_context(ohci, d->ctrlClear, NULL);
418
419 d->prg_ind = 0;
420 d->sent_ind = 0;
421 d->free_prgs = d->num_desc;
422 d->branchAddrPtr = NULL;
423 INIT_LIST_HEAD(&d->fifo_list);
424 INIT_LIST_HEAD(&d->pending_list);
425
426 if (d->type == DMA_CTX_ISO) {
427 /* enable interrupts */
428 reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1 << d->ctx);
429 }
430
431 DBGMSG("Transmit DMA ctx=%d initialized", d->ctx);
432 }
433
434 /* Count the number of available iso contexts */
435 static int get_nb_iso_ctx(struct ti_ohci *ohci, int reg)
436 {
437 int i,ctx=0;
438 u32 tmp;
439
440 reg_write(ohci, reg, 0xffffffff);
441 tmp = reg_read(ohci, reg);
442
443 DBGMSG("Iso contexts reg: %08x implemented: %08x", reg, tmp);
444
445 /* Count the number of contexts */
446 for (i=0; i<32; i++) {
447 if (tmp & 1) ctx++;
448 tmp >>= 1;
449 }
450 return ctx;
451 }
452
453 /* Global initialization */
454 static void ohci_initialize(struct ti_ohci *ohci)
455 {
456 quadlet_t buf;
457 int num_ports, i;
458
459 spin_lock_init(&ohci->phy_reg_lock);
460
461 /* Put some defaults to these undefined bus options */
462 buf = reg_read(ohci, OHCI1394_BusOptions);
463 buf |= 0x60000000; /* Enable CMC and ISC */
464 if (hpsb_disable_irm)
465 buf &= ~0x80000000;
466 else
467 buf |= 0x80000000; /* Enable IRMC */
468 buf &= ~0x00ff0000; /* XXX: Set cyc_clk_acc to zero for now */
469 buf &= ~0x18000000; /* Disable PMC and BMC */
470 reg_write(ohci, OHCI1394_BusOptions, buf);
471
472 /* Set the bus number */
473 reg_write(ohci, OHCI1394_NodeID, 0x0000ffc0);
474
475 /* Enable posted writes */
476 reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_postedWriteEnable);
477
478 /* Clear link control register */
479 reg_write(ohci, OHCI1394_LinkControlClear, 0xffffffff);
480
481 /* Enable cycle timer and cycle master and set the IRM
482 * contender bit in our self ID packets if appropriate. */
483 reg_write(ohci, OHCI1394_LinkControlSet,
484 OHCI1394_LinkControl_CycleTimerEnable |
485 OHCI1394_LinkControl_CycleMaster);
486 i = get_phy_reg(ohci, 4) | PHY_04_LCTRL;
487 if (hpsb_disable_irm)
488 i &= ~PHY_04_CONTENDER;
489 else
490 i |= PHY_04_CONTENDER;
491 set_phy_reg(ohci, 4, i);
492
493 /* Set up self-id dma buffer */
494 reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->selfid_buf_bus);
495
496 /* enable self-id */
497 reg_write(ohci, OHCI1394_LinkControlSet, OHCI1394_LinkControl_RcvSelfID);
498
499 /* Set the Config ROM mapping register */
500 reg_write(ohci, OHCI1394_ConfigROMmap, ohci->csr_config_rom_bus);
501
502 /* Now get our max packet size */
503 ohci->max_packet_size =
504 1<<(((reg_read(ohci, OHCI1394_BusOptions)>>12)&0xf)+1);
505
506 /* Clear the interrupt mask */
507 reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, 0xffffffff);
508 reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 0xffffffff);
509
510 /* Clear the interrupt mask */
511 reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, 0xffffffff);
512 reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 0xffffffff);
513
514 /* Initialize AR dma */
515 initialize_dma_rcv_ctx(&ohci->ar_req_context, 0);
516 initialize_dma_rcv_ctx(&ohci->ar_resp_context, 0);
517
518 /* Initialize AT dma */
519 initialize_dma_trm_ctx(&ohci->at_req_context);
520 initialize_dma_trm_ctx(&ohci->at_resp_context);
521
522 /* Accept AR requests from all nodes */
523 reg_write(ohci, OHCI1394_AsReqFilterHiSet, 0x80000000);
524
525 /* Set the address range of the physical response unit.
526 * Most controllers do not implement it as a writable register though.
527 * They will keep a hardwired offset of 0x00010000 and show 0x0 as
528 * register content.
529 * To actually enable physical responses is the job of our interrupt
530 * handler which programs the physical request filter. */
531 reg_write(ohci, OHCI1394_PhyUpperBound,
532 OHCI1394_PHYS_UPPER_BOUND_PROGRAMMED >> 16);
533
534 DBGMSG("physUpperBoundOffset=%08x",
535 reg_read(ohci, OHCI1394_PhyUpperBound));
536
537 /* Specify AT retries */
538 reg_write(ohci, OHCI1394_ATRetries,
539 OHCI1394_MAX_AT_REQ_RETRIES |
540 (OHCI1394_MAX_AT_RESP_RETRIES<<4) |
541 (OHCI1394_MAX_PHYS_RESP_RETRIES<<8));
542
543 /* We don't want hardware swapping */
544 reg_write(ohci, OHCI1394_HCControlClear, OHCI1394_HCControl_noByteSwap);
545
546 /* Enable interrupts */
547 reg_write(ohci, OHCI1394_IntMaskSet,
548 OHCI1394_unrecoverableError |
549 OHCI1394_masterIntEnable |
550 OHCI1394_busReset |
551 OHCI1394_selfIDComplete |
552 OHCI1394_RSPkt |
553 OHCI1394_RQPkt |
554 OHCI1394_respTxComplete |
555 OHCI1394_reqTxComplete |
556 OHCI1394_isochRx |
557 OHCI1394_isochTx |
558 OHCI1394_postedWriteErr |
559 OHCI1394_cycleTooLong |
560 OHCI1394_cycleInconsistent);
561
562 /* Enable link */
563 reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_linkEnable);
564
565 buf = reg_read(ohci, OHCI1394_Version);
566 PRINT(KERN_INFO, "OHCI-1394 %d.%d (PCI): IRQ=[%d] "
567 "MMIO=[%llx-%llx] Max Packet=[%d] IR/IT contexts=[%d/%d]",
568 ((((buf) >> 16) & 0xf) + (((buf) >> 20) & 0xf) * 10),
569 ((((buf) >> 4) & 0xf) + ((buf) & 0xf) * 10), ohci->dev->irq,
570 (unsigned long long)pci_resource_start(ohci->dev, 0),
571 (unsigned long long)pci_resource_start(ohci->dev, 0) + OHCI1394_REGISTER_SIZE - 1,
572 ohci->max_packet_size,
573 ohci->nb_iso_rcv_ctx, ohci->nb_iso_xmit_ctx);
574
575 /* Check all of our ports to make sure that if anything is
576 * connected, we enable that port. */
577 num_ports = get_phy_reg(ohci, 2) & 0xf;
578 for (i = 0; i < num_ports; i++) {
579 unsigned int status;
580
581 set_phy_reg(ohci, 7, i);
582 status = get_phy_reg(ohci, 8);
583
584 if (status & 0x20)
585 set_phy_reg(ohci, 8, status & ~1);
586 }
587
588 /* Serial EEPROM Sanity check. */
589 if ((ohci->max_packet_size < 512) ||
590 (ohci->max_packet_size > 4096)) {
591 /* Serial EEPROM contents are suspect, set a sane max packet
592 * size and print the raw contents for bug reports if verbose
593 * debug is enabled. */
594 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
595 int i;
596 #endif
597
598 PRINT(KERN_DEBUG, "Serial EEPROM has suspicious values, "
599 "attempting to set max_packet_size to 512 bytes");
600 reg_write(ohci, OHCI1394_BusOptions,
601 (reg_read(ohci, OHCI1394_BusOptions) & 0xf007) | 0x8002);
602 ohci->max_packet_size = 512;
603 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
604 PRINT(KERN_DEBUG, " EEPROM Present: %d",
605 (reg_read(ohci, OHCI1394_Version) >> 24) & 0x1);
606 reg_write(ohci, OHCI1394_GUID_ROM, 0x80000000);
607
608 for (i = 0;
609 ((i < 1000) &&
610 (reg_read(ohci, OHCI1394_GUID_ROM) & 0x80000000)); i++)
611 udelay(10);
612
613 for (i = 0; i < 0x20; i++) {
614 reg_write(ohci, OHCI1394_GUID_ROM, 0x02000000);
615 PRINT(KERN_DEBUG, " EEPROM %02x: %02x", i,
616 (reg_read(ohci, OHCI1394_GUID_ROM) >> 16) & 0xff);
617 }
618 #endif
619 }
620 }
621
622 /*
623 * Insert a packet in the DMA fifo and generate the DMA prg
624 * FIXME: rewrite the program in order to accept packets crossing
625 * page boundaries.
626 * check also that a single dma descriptor doesn't cross a
627 * page boundary.
628 */
629 static void insert_packet(struct ti_ohci *ohci,
630 struct dma_trm_ctx *d, struct hpsb_packet *packet)
631 {
632 u32 cycleTimer;
633 int idx = d->prg_ind;
634
635 DBGMSG("Inserting packet for node " NODE_BUS_FMT
636 ", tlabel=%d, tcode=0x%x, speed=%d",
637 NODE_BUS_ARGS(ohci->host, packet->node_id), packet->tlabel,
638 packet->tcode, packet->speed_code);
639
640 d->prg_cpu[idx]->begin.address = 0;
641 d->prg_cpu[idx]->begin.branchAddress = 0;
642
643 if (d->type == DMA_CTX_ASYNC_RESP) {
644 /*
645 * For response packets, we need to put a timeout value in
646 * the 16 lower bits of the status... let's try 1 sec timeout
647 */
648 cycleTimer = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
649 d->prg_cpu[idx]->begin.status = cpu_to_le32(
650 (((((cycleTimer>>25)&0x7)+1)&0x7)<<13) |
651 ((cycleTimer&0x01fff000)>>12));
652
653 DBGMSG("cycleTimer: %08x timeStamp: %08x",
654 cycleTimer, d->prg_cpu[idx]->begin.status);
655 } else
656 d->prg_cpu[idx]->begin.status = 0;
657
658 if ( (packet->type == hpsb_async) || (packet->type == hpsb_raw) ) {
659
660 if (packet->type == hpsb_raw) {
661 d->prg_cpu[idx]->data[0] = cpu_to_le32(OHCI1394_TCODE_PHY<<4);
662 d->prg_cpu[idx]->data[1] = cpu_to_le32(packet->header[0]);
663 d->prg_cpu[idx]->data[2] = cpu_to_le32(packet->header[1]);
664 } else {
665 d->prg_cpu[idx]->data[0] = packet->speed_code<<16 |
666 (packet->header[0] & 0xFFFF);
667
668 if (packet->tcode == TCODE_ISO_DATA) {
669 /* Sending an async stream packet */
670 d->prg_cpu[idx]->data[1] = packet->header[0] & 0xFFFF0000;
671 } else {
672 /* Sending a normal async request or response */
673 d->prg_cpu[idx]->data[1] =
674 (packet->header[1] & 0xFFFF) |
675 (packet->header[0] & 0xFFFF0000);
676 d->prg_cpu[idx]->data[2] = packet->header[2];
677 d->prg_cpu[idx]->data[3] = packet->header[3];
678 }
679 header_le32_to_cpu(d->prg_cpu[idx]->data, packet->tcode);
680 }
681
682 if (packet->data_size) { /* block transmit */
683 if (packet->tcode == TCODE_STREAM_DATA){
684 d->prg_cpu[idx]->begin.control =
685 cpu_to_le32(DMA_CTL_OUTPUT_MORE |
686 DMA_CTL_IMMEDIATE | 0x8);
687 } else {
688 d->prg_cpu[idx]->begin.control =
689 cpu_to_le32(DMA_CTL_OUTPUT_MORE |
690 DMA_CTL_IMMEDIATE | 0x10);
691 }
692 d->prg_cpu[idx]->end.control =
693 cpu_to_le32(DMA_CTL_OUTPUT_LAST |
694 DMA_CTL_IRQ |
695 DMA_CTL_BRANCH |
696 packet->data_size);
697 /*
698 * Check that the packet data buffer
699 * does not cross a page boundary.
700 *
701 * XXX Fix this some day. eth1394 seems to trigger
702 * it, but ignoring it doesn't seem to cause a
703 * problem.
704 */
705 #if 0
706 if (cross_bound((unsigned long)packet->data,
707 packet->data_size)>0) {
708 /* FIXME: do something about it */
709 PRINT(KERN_ERR,
710 "%s: packet data addr: %p size %Zd bytes "
711 "cross page boundary", __FUNCTION__,
712 packet->data, packet->data_size);
713 }
714 #endif
715 d->prg_cpu[idx]->end.address = cpu_to_le32(
716 pci_map_single(ohci->dev, packet->data,
717 packet->data_size,
718 PCI_DMA_TODEVICE));
719
720 d->prg_cpu[idx]->end.branchAddress = 0;
721 d->prg_cpu[idx]->end.status = 0;
722 if (d->branchAddrPtr)
723 *(d->branchAddrPtr) =
724 cpu_to_le32(d->prg_bus[idx] | 0x3);
725 d->branchAddrPtr =
726 &(d->prg_cpu[idx]->end.branchAddress);
727 } else { /* quadlet transmit */
728 if (packet->type == hpsb_raw)
729 d->prg_cpu[idx]->begin.control =
730 cpu_to_le32(DMA_CTL_OUTPUT_LAST |
731 DMA_CTL_IMMEDIATE |
732 DMA_CTL_IRQ |
733 DMA_CTL_BRANCH |
734 (packet->header_size + 4));
735 else
736 d->prg_cpu[idx]->begin.control =
737 cpu_to_le32(DMA_CTL_OUTPUT_LAST |
738 DMA_CTL_IMMEDIATE |
739 DMA_CTL_IRQ |
740 DMA_CTL_BRANCH |
741 packet->header_size);
742
743 if (d->branchAddrPtr)
744 *(d->branchAddrPtr) =
745 cpu_to_le32(d->prg_bus[idx] | 0x2);
746 d->branchAddrPtr =
747 &(d->prg_cpu[idx]->begin.branchAddress);
748 }
749
750 } else { /* iso packet */
751 d->prg_cpu[idx]->data[0] = packet->speed_code<<16 |
752 (packet->header[0] & 0xFFFF);
753 d->prg_cpu[idx]->data[1] = packet->header[0] & 0xFFFF0000;
754 header_le32_to_cpu(d->prg_cpu[idx]->data, packet->tcode);
755
756 d->prg_cpu[idx]->begin.control =
757 cpu_to_le32(DMA_CTL_OUTPUT_MORE |
758 DMA_CTL_IMMEDIATE | 0x8);
759 d->prg_cpu[idx]->end.control =
760 cpu_to_le32(DMA_CTL_OUTPUT_LAST |
761 DMA_CTL_UPDATE |
762 DMA_CTL_IRQ |
763 DMA_CTL_BRANCH |
764 packet->data_size);
765 d->prg_cpu[idx]->end.address = cpu_to_le32(
766 pci_map_single(ohci->dev, packet->data,
767 packet->data_size, PCI_DMA_TODEVICE));
768
769 d->prg_cpu[idx]->end.branchAddress = 0;
770 d->prg_cpu[idx]->end.status = 0;
771 DBGMSG("Iso xmit context info: header[%08x %08x]\n"
772 " begin=%08x %08x %08x %08x\n"
773 " %08x %08x %08x %08x\n"
774 " end =%08x %08x %08x %08x",
775 d->prg_cpu[idx]->data[0], d->prg_cpu[idx]->data[1],
776 d->prg_cpu[idx]->begin.control,
777 d->prg_cpu[idx]->begin.address,
778 d->prg_cpu[idx]->begin.branchAddress,
779 d->prg_cpu[idx]->begin.status,
780 d->prg_cpu[idx]->data[0],
781 d->prg_cpu[idx]->data[1],
782 d->prg_cpu[idx]->data[2],
783 d->prg_cpu[idx]->data[3],
784 d->prg_cpu[idx]->end.control,
785 d->prg_cpu[idx]->end.address,
786 d->prg_cpu[idx]->end.branchAddress,
787 d->prg_cpu[idx]->end.status);
788 if (d->branchAddrPtr)
789 *(d->branchAddrPtr) = cpu_to_le32(d->prg_bus[idx] | 0x3);
790 d->branchAddrPtr = &(d->prg_cpu[idx]->end.branchAddress);
791 }
792 d->free_prgs--;
793
794 /* queue the packet in the appropriate context queue */
795 list_add_tail(&packet->driver_list, &d->fifo_list);
796 d->prg_ind = (d->prg_ind + 1) % d->num_desc;
797 }
798
799 /*
800 * This function fills the FIFO with the (eventual) pending packets
801 * and runs or wakes up the DMA prg if necessary.
802 *
803 * The function MUST be called with the d->lock held.
804 */
805 static void dma_trm_flush(struct ti_ohci *ohci, struct dma_trm_ctx *d)
806 {
807 struct hpsb_packet *packet, *ptmp;
808 int idx = d->prg_ind;
809 int z = 0;
810
811 /* insert the packets into the dma fifo */
812 list_for_each_entry_safe(packet, ptmp, &d->pending_list, driver_list) {
813 if (!d->free_prgs)
814 break;
815
816 /* For the first packet only */
817 if (!z)
818 z = (packet->data_size) ? 3 : 2;
819
820 /* Insert the packet */
821 list_del_init(&packet->driver_list);
822 insert_packet(ohci, d, packet);
823 }
824
825 /* Nothing must have been done, either no free_prgs or no packets */
826 if (z == 0)
827 return;
828
829 /* Is the context running ? (should be unless it is
830 the first packet to be sent in this context) */
831 if (!(reg_read(ohci, d->ctrlSet) & 0x8000)) {
832 u32 nodeId = reg_read(ohci, OHCI1394_NodeID);
833
834 DBGMSG("Starting transmit DMA ctx=%d",d->ctx);
835 reg_write(ohci, d->cmdPtr, d->prg_bus[idx] | z);
836
837 /* Check that the node id is valid, and not 63 */
838 if (!(nodeId & 0x80000000) || (nodeId & 0x3f) == 63)
839 PRINT(KERN_ERR, "Running dma failed because Node ID is not valid");
840 else
841 reg_write(ohci, d->ctrlSet, 0x8000);
842 } else {
843 /* Wake up the dma context if necessary */
844 if (!(reg_read(ohci, d->ctrlSet) & 0x400))
845 DBGMSG("Waking transmit DMA ctx=%d",d->ctx);
846
847 /* do this always, to avoid race condition */
848 reg_write(ohci, d->ctrlSet, 0x1000);
849 }
850
851 return;
852 }
853
854 /* Transmission of an async or iso packet */
855 static int ohci_transmit(struct hpsb_host *host, struct hpsb_packet *packet)
856 {
857 struct ti_ohci *ohci = host->hostdata;
858 struct dma_trm_ctx *d;
859 unsigned long flags;
860
861 if (packet->data_size > ohci->max_packet_size) {
862 PRINT(KERN_ERR,
863 "Transmit packet size %Zd is too big",
864 packet->data_size);
865 return -EOVERFLOW;
866 }
867
868 if (packet->type == hpsb_raw)
869 d = &ohci->at_req_context;
870 else if ((packet->tcode & 0x02) && (packet->tcode != TCODE_ISO_DATA))
871 d = &ohci->at_resp_context;
872 else
873 d = &ohci->at_req_context;
874
875 spin_lock_irqsave(&d->lock,flags);
876
877 list_add_tail(&packet->driver_list, &d->pending_list);
878
879 dma_trm_flush(ohci, d);
880
881 spin_unlock_irqrestore(&d->lock,flags);
882
883 return 0;
884 }
885
886 static int ohci_devctl(struct hpsb_host *host, enum devctl_cmd cmd, int arg)
887 {
888 struct ti_ohci *ohci = host->hostdata;
889 int retval = 0, phy_reg;
890
891 switch (cmd) {
892 case RESET_BUS:
893 switch (arg) {
894 case SHORT_RESET:
895 phy_reg = get_phy_reg(ohci, 5);
896 phy_reg |= 0x40;
897 set_phy_reg(ohci, 5, phy_reg); /* set ISBR */
898 break;
899 case LONG_RESET:
900 phy_reg = get_phy_reg(ohci, 1);
901 phy_reg |= 0x40;
902 set_phy_reg(ohci, 1, phy_reg); /* set IBR */
903 break;
904 case SHORT_RESET_NO_FORCE_ROOT:
905 phy_reg = get_phy_reg(ohci, 1);
906 if (phy_reg & 0x80) {
907 phy_reg &= ~0x80;
908 set_phy_reg(ohci, 1, phy_reg); /* clear RHB */
909 }
910
911 phy_reg = get_phy_reg(ohci, 5);
912 phy_reg |= 0x40;
913 set_phy_reg(ohci, 5, phy_reg); /* set ISBR */
914 break;
915 case LONG_RESET_NO_FORCE_ROOT:
916 phy_reg = get_phy_reg(ohci, 1);
917 phy_reg &= ~0x80;
918 phy_reg |= 0x40;
919 set_phy_reg(ohci, 1, phy_reg); /* clear RHB, set IBR */
920 break;
921 case SHORT_RESET_FORCE_ROOT:
922 phy_reg = get_phy_reg(ohci, 1);
923 if (!(phy_reg & 0x80)) {
924 phy_reg |= 0x80;
925 set_phy_reg(ohci, 1, phy_reg); /* set RHB */
926 }
927
928 phy_reg = get_phy_reg(ohci, 5);
929 phy_reg |= 0x40;
930 set_phy_reg(ohci, 5, phy_reg); /* set ISBR */
931 break;
932 case LONG_RESET_FORCE_ROOT:
933 phy_reg = get_phy_reg(ohci, 1);
934 phy_reg |= 0xc0;
935 set_phy_reg(ohci, 1, phy_reg); /* set RHB and IBR */
936 break;
937 default:
938 retval = -1;
939 }
940 break;
941
942 case GET_CYCLE_COUNTER:
943 retval = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
944 break;
945
946 case SET_CYCLE_COUNTER:
947 reg_write(ohci, OHCI1394_IsochronousCycleTimer, arg);
948 break;
949
950 case SET_BUS_ID:
951 PRINT(KERN_ERR, "devctl command SET_BUS_ID err");
952 break;
953
954 case ACT_CYCLE_MASTER:
955 if (arg) {
956 /* check if we are root and other nodes are present */
957 u32 nodeId = reg_read(ohci, OHCI1394_NodeID);
958 if ((nodeId & (1<<30)) && (nodeId & 0x3f)) {
959 /*
960 * enable cycleTimer, cycleMaster
961 */
962 DBGMSG("Cycle master enabled");
963 reg_write(ohci, OHCI1394_LinkControlSet,
964 OHCI1394_LinkControl_CycleTimerEnable |
965 OHCI1394_LinkControl_CycleMaster);
966 }
967 } else {
968 /* disable cycleTimer, cycleMaster, cycleSource */
969 reg_write(ohci, OHCI1394_LinkControlClear,
970 OHCI1394_LinkControl_CycleTimerEnable |
971 OHCI1394_LinkControl_CycleMaster |
972 OHCI1394_LinkControl_CycleSource);
973 }
974 break;
975
976 case CANCEL_REQUESTS:
977 DBGMSG("Cancel request received");
978 dma_trm_reset(&ohci->at_req_context);
979 dma_trm_reset(&ohci->at_resp_context);
980 break;
981
982 default:
983 PRINT_G(KERN_ERR, "ohci_devctl cmd %d not implemented yet",
984 cmd);
985 break;
986 }
987 return retval;
988 }
989
990 /***********************************
991 * rawiso ISO reception *
992 ***********************************/
993
994 /*
995 We use either buffer-fill or packet-per-buffer DMA mode. The DMA
996 buffer is split into "blocks" (regions described by one DMA
997 descriptor). Each block must be one page or less in size, and
998 must not cross a page boundary.
999
1000 There is one little wrinkle with buffer-fill mode: a packet that
1001 starts in the final block may wrap around into the first block. But
1002 the user API expects all packets to be contiguous. Our solution is
1003 to keep the very last page of the DMA buffer in reserve - if a
1004 packet spans the gap, we copy its tail into this page.
1005 */
1006
1007 struct ohci_iso_recv {
1008 struct ti_ohci *ohci;
1009
1010 struct ohci1394_iso_tasklet task;
1011 int task_active;
1012
1013 enum { BUFFER_FILL_MODE = 0,
1014 PACKET_PER_BUFFER_MODE = 1 } dma_mode;
1015
1016 /* memory and PCI mapping for the DMA descriptors */
1017 struct dma_prog_region prog;
1018 struct dma_cmd *block; /* = (struct dma_cmd*) prog.virt */
1019
1020 /* how many DMA blocks fit in the buffer */
1021 unsigned int nblocks;
1022
1023 /* stride of DMA blocks */
1024 unsigned int buf_stride;
1025
1026 /* number of blocks to batch between interrupts */
1027 int block_irq_interval;
1028
1029 /* block that DMA will finish next */
1030 int block_dma;
1031
1032 /* (buffer-fill only) block that the reader will release next */
1033 int block_reader;
1034
1035 /* (buffer-fill only) bytes of buffer the reader has released,
1036 less than one block */
1037 int released_bytes;
1038
1039 /* (buffer-fill only) buffer offset at which the next packet will appear */
1040 int dma_offset;
1041
1042 /* OHCI DMA context control registers */
1043 u32 ContextControlSet;
1044 u32 ContextControlClear;
1045 u32 CommandPtr;
1046 u32 ContextMatch;
1047 };
1048
1049 static void ohci_iso_recv_task(unsigned long data);
1050 static void ohci_iso_recv_stop(struct hpsb_iso *iso);
1051 static void ohci_iso_recv_shutdown(struct hpsb_iso *iso);
1052 static int ohci_iso_recv_start(struct hpsb_iso *iso, int cycle, int tag_mask, int sync);
1053 static void ohci_iso_recv_program(struct hpsb_iso *iso);
1054
1055 static int ohci_iso_recv_init(struct hpsb_iso *iso)
1056 {
1057 struct ti_ohci *ohci = iso->host->hostdata;
1058 struct ohci_iso_recv *recv;
1059 int ctx;
1060 int ret = -ENOMEM;
1061
1062 recv = kmalloc(sizeof(*recv), GFP_KERNEL);
1063 if (!recv)
1064 return -ENOMEM;
1065
1066 iso->hostdata = recv;
1067 recv->ohci = ohci;
1068 recv->task_active = 0;
1069 dma_prog_region_init(&recv->prog);
1070 recv->block = NULL;
1071
1072 /* use buffer-fill mode, unless irq_interval is 1
1073 (note: multichannel requires buffer-fill) */
1074
1075 if (((iso->irq_interval == 1 && iso->dma_mode == HPSB_ISO_DMA_OLD_ABI) ||
1076 iso->dma_mode == HPSB_ISO_DMA_PACKET_PER_BUFFER) && iso->channel != -1) {
1077 recv->dma_mode = PACKET_PER_BUFFER_MODE;
1078 } else {
1079 recv->dma_mode = BUFFER_FILL_MODE;
1080 }
1081
1082 /* set nblocks, buf_stride, block_irq_interval */
1083
1084 if (recv->dma_mode == BUFFER_FILL_MODE) {
1085 recv->buf_stride = PAGE_SIZE;
1086
1087 /* one block per page of data in the DMA buffer, minus the final guard page */
1088 recv->nblocks = iso->buf_size/PAGE_SIZE - 1;
1089 if (recv->nblocks < 3) {
1090 DBGMSG("ohci_iso_recv_init: DMA buffer too small");
1091 goto err;
1092 }
1093
1094 /* iso->irq_interval is in packets - translate that to blocks */
1095 if (iso->irq_interval == 1)
1096 recv->block_irq_interval = 1;
1097 else
1098 recv->block_irq_interval = iso->irq_interval *
1099 ((recv->nblocks+1)/iso->buf_packets);
1100 if (recv->block_irq_interval*4 > recv->nblocks)
1101 recv->block_irq_interval = recv->nblocks/4;
1102 if (recv->block_irq_interval < 1)
1103 recv->block_irq_interval = 1;
1104
1105 } else {
1106 int max_packet_size;
1107
1108 recv->nblocks = iso->buf_packets;
1109 recv->block_irq_interval = iso->irq_interval;
1110 if (recv->block_irq_interval * 4 > iso->buf_packets)
1111 recv->block_irq_interval = iso->buf_packets / 4;
1112 if (recv->block_irq_interval < 1)
1113 recv->block_irq_interval = 1;
1114
1115 /* choose a buffer stride */
1116 /* must be a power of 2, and <= PAGE_SIZE */
1117
1118 max_packet_size = iso->buf_size / iso->buf_packets;
1119
1120 for (recv->buf_stride = 8; recv->buf_stride < max_packet_size;
1121 recv->buf_stride *= 2);
1122
1123 if (recv->buf_stride*iso->buf_packets > iso->buf_size ||
1124 recv->buf_stride > PAGE_SIZE) {
1125 /* this shouldn't happen, but anyway... */
1126 DBGMSG("ohci_iso_recv_init: problem choosing a buffer stride");
1127 goto err;
1128 }
1129 }
1130
1131 recv->block_reader = 0;
1132 recv->released_bytes = 0;
1133 recv->block_dma = 0;
1134 recv->dma_offset = 0;
1135
1136 /* size of DMA program = one descriptor per block */
1137 if (dma_prog_region_alloc(&recv->prog,
1138 sizeof(struct dma_cmd) * recv->nblocks,
1139 recv->ohci->dev))
1140 goto err;
1141
1142 recv->block = (struct dma_cmd*) recv->prog.kvirt;
1143
1144 ohci1394_init_iso_tasklet(&recv->task,
1145 iso->channel == -1 ? OHCI_ISO_MULTICHANNEL_RECEIVE :
1146 OHCI_ISO_RECEIVE,
1147 ohci_iso_recv_task, (unsigned long) iso);
1148
1149 if (ohci1394_register_iso_tasklet(recv->ohci, &recv->task) < 0) {
1150 ret = -EBUSY;
1151 goto err;
1152 }
1153
1154 recv->task_active = 1;
1155
1156 /* recv context registers are spaced 32 bytes apart */
1157 ctx = recv->task.context;
1158 recv->ContextControlSet = OHCI1394_IsoRcvContextControlSet + 32 * ctx;
1159 recv->ContextControlClear = OHCI1394_IsoRcvContextControlClear + 32 * ctx;
1160 recv->CommandPtr = OHCI1394_IsoRcvCommandPtr + 32 * ctx;
1161 recv->ContextMatch = OHCI1394_IsoRcvContextMatch + 32 * ctx;
1162
1163 if (iso->channel == -1) {
1164 /* clear multi-channel selection mask */
1165 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskHiClear, 0xFFFFFFFF);
1166 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskLoClear, 0xFFFFFFFF);
1167 }
1168
1169 /* write the DMA program */
1170 ohci_iso_recv_program(iso);
1171
1172 DBGMSG("ohci_iso_recv_init: %s mode, DMA buffer is %lu pages"
1173 " (%u bytes), using %u blocks, buf_stride %u, block_irq_interval %d",
1174 recv->dma_mode == BUFFER_FILL_MODE ?
1175 "buffer-fill" : "packet-per-buffer",
1176 iso->buf_size/PAGE_SIZE, iso->buf_size,
1177 recv->nblocks, recv->buf_stride, recv->block_irq_interval);
1178
1179 return 0;
1180
1181 err:
1182 ohci_iso_recv_shutdown(iso);
1183 return ret;
1184 }
1185
1186 static void ohci_iso_recv_stop(struct hpsb_iso *iso)
1187 {
1188 struct ohci_iso_recv *recv = iso->hostdata;
1189
1190 /* disable interrupts */
1191 reg_write(recv->ohci, OHCI1394_IsoRecvIntMaskClear, 1 << recv->task.context);
1192
1193 /* halt DMA */
1194 ohci1394_stop_context(recv->ohci, recv->ContextControlClear, NULL);
1195 }
1196
1197 static void ohci_iso_recv_shutdown(struct hpsb_iso *iso)
1198 {
1199 struct ohci_iso_recv *recv = iso->hostdata;
1200
1201 if (recv->task_active) {
1202 ohci_iso_recv_stop(iso);
1203 ohci1394_unregister_iso_tasklet(recv->ohci, &recv->task);
1204 recv->task_active = 0;
1205 }
1206
1207 dma_prog_region_free(&recv->prog);
1208 kfree(recv);
1209 iso->hostdata = NULL;
1210 }
1211
1212 /* set up a "gapped" ring buffer DMA program */
1213 static void ohci_iso_recv_program(struct hpsb_iso *iso)
1214 {
1215 struct ohci_iso_recv *recv = iso->hostdata;
1216 int blk;
1217
1218 /* address of 'branch' field in previous DMA descriptor */
1219 u32 *prev_branch = NULL;
1220
1221 for (blk = 0; blk < recv->nblocks; blk++) {
1222 u32 control;
1223
1224 /* the DMA descriptor */
1225 struct dma_cmd *cmd = &recv->block[blk];
1226
1227 /* offset of the DMA descriptor relative to the DMA prog buffer */
1228 unsigned long prog_offset = blk * sizeof(struct dma_cmd);
1229
1230 /* offset of this packet's data within the DMA buffer */
1231 unsigned long buf_offset = blk * recv->buf_stride;
1232
1233 if (recv->dma_mode == BUFFER_FILL_MODE) {
1234 control = 2 << 28; /* INPUT_MORE */
1235 } else {
1236 control = 3 << 28; /* INPUT_LAST */
1237 }
1238
1239 control |= 8 << 24; /* s = 1, update xferStatus and resCount */
1240
1241 /* interrupt on last block, and at intervals */
1242 if (blk == recv->nblocks-1 || (blk % recv->block_irq_interval) == 0) {
1243 control |= 3 << 20; /* want interrupt */
1244 }
1245
1246 control |= 3 << 18; /* enable branch to address */
1247 control |= recv->buf_stride;
1248
1249 cmd->control = cpu_to_le32(control);
1250 cmd->address = cpu_to_le32(dma_region_offset_to_bus(&iso->data_buf, buf_offset));
1251 cmd->branchAddress = 0; /* filled in on next loop */
1252 cmd->status = cpu_to_le32(recv->buf_stride);
1253
1254 /* link the previous descriptor to this one */
1255 if (prev_branch) {
1256 *prev_branch = cpu_to_le32(dma_prog_region_offset_to_bus(&recv->prog, prog_offset) | 1);
1257 }
1258
1259 prev_branch = &cmd->branchAddress;
1260 }
1261
1262 /* the final descriptor's branch address and Z should be left at 0 */
1263 }
1264
1265 /* listen or unlisten to a specific channel (multi-channel mode only) */
1266 static void ohci_iso_recv_change_channel(struct hpsb_iso *iso, unsigned char channel, int listen)
1267 {
1268 struct ohci_iso_recv *recv = iso->hostdata;
1269 int reg, i;
1270
1271 if (channel < 32) {
1272 reg = listen ? OHCI1394_IRMultiChanMaskLoSet : OHCI1394_IRMultiChanMaskLoClear;
1273 i = channel;
1274 } else {
1275 reg = listen ? OHCI1394_IRMultiChanMaskHiSet : OHCI1394_IRMultiChanMaskHiClear;
1276 i = channel - 32;
1277 }
1278
1279 reg_write(recv->ohci, reg, (1 << i));
1280
1281 /* issue a dummy read to force all PCI writes to be posted immediately */
1282 mb();
1283 reg_read(recv->ohci, OHCI1394_IsochronousCycleTimer);
1284 }
1285
1286 static void ohci_iso_recv_set_channel_mask(struct hpsb_iso *iso, u64 mask)
1287 {
1288 struct ohci_iso_recv *recv = iso->hostdata;
1289 int i;
1290
1291 for (i = 0; i < 64; i++) {
1292 if (mask & (1ULL << i)) {
1293 if (i < 32)
1294 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskLoSet, (1 << i));
1295 else
1296 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskHiSet, (1 << (i-32)));
1297 } else {
1298 if (i < 32)
1299 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskLoClear, (1 << i));
1300 else
1301 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskHiClear, (1 << (i-32)));
1302 }
1303 }
1304
1305 /* issue a dummy read to force all PCI writes to be posted immediately */
1306 mb();
1307 reg_read(recv->ohci, OHCI1394_IsochronousCycleTimer);
1308 }
1309
1310 static int ohci_iso_recv_start(struct hpsb_iso *iso, int cycle, int tag_mask, int sync)
1311 {
1312 struct ohci_iso_recv *recv = iso->hostdata;
1313 struct ti_ohci *ohci = recv->ohci;
1314 u32 command, contextMatch;
1315
1316 reg_write(recv->ohci, recv->ContextControlClear, 0xFFFFFFFF);
1317 wmb();
1318
1319 /* always keep ISO headers */
1320 command = (1 << 30);
1321
1322 if (recv->dma_mode == BUFFER_FILL_MODE)
1323 command |= (1 << 31);
1324
1325 reg_write(recv->ohci, recv->ContextControlSet, command);
1326
1327 /* match on specified tags */
1328 contextMatch = tag_mask << 28;
1329
1330 if (iso->channel == -1) {
1331 /* enable multichannel reception */
1332 reg_write(recv->ohci, recv->ContextControlSet, (1 << 28));
1333 } else {
1334 /* listen on channel */
1335 contextMatch |= iso->channel;
1336 }
1337
1338 if (cycle != -1) {
1339 u32 seconds;
1340
1341 /* enable cycleMatch */
1342 reg_write(recv->ohci, recv->ContextControlSet, (1 << 29));
1343
1344 /* set starting cycle */
1345 cycle &= 0x1FFF;
1346
1347 /* 'cycle' is only mod 8000, but we also need two 'seconds' bits -
1348 just snarf them from the current time */
1349 seconds = reg_read(recv->ohci, OHCI1394_IsochronousCycleTimer) >> 25;
1350
1351 /* advance one second to give some extra time for DMA to start */
1352 seconds += 1;
1353
1354 cycle |= (seconds & 3) << 13;
1355
1356 contextMatch |= cycle << 12;
1357 }
1358
1359 if (sync != -1) {
1360 /* set sync flag on first DMA descriptor */
1361 struct dma_cmd *cmd = &recv->block[recv->block_dma];
1362 cmd->control |= cpu_to_le32(DMA_CTL_WAIT);
1363
1364 /* match sync field */
1365 contextMatch |= (sync&0xf)<<8;
1366 }
1367
1368 reg_write(recv->ohci, recv->ContextMatch, contextMatch);
1369
1370 /* address of first descriptor block */
1371 command = dma_prog_region_offset_to_bus(&recv->prog,
1372 recv->block_dma * sizeof(struct dma_cmd));
1373 command |= 1; /* Z=1 */
1374
1375 reg_write(recv->ohci, recv->CommandPtr, command);
1376
1377 /* enable interrupts */
1378 reg_write(recv->ohci, OHCI1394_IsoRecvIntMaskSet, 1 << recv->task.context);
1379
1380 wmb();
1381
1382 /* run */
1383 reg_write(recv->ohci, recv->ContextControlSet, 0x8000);
1384
1385 /* issue a dummy read of the cycle timer register to force
1386 all PCI writes to be posted immediately */
1387 mb();
1388 reg_read(recv->ohci, OHCI1394_IsochronousCycleTimer);
1389
1390 /* check RUN */
1391 if (!(reg_read(recv->ohci, recv->ContextControlSet) & 0x8000)) {
1392 PRINT(KERN_ERR,
1393 "Error starting IR DMA (ContextControl 0x%08x)\n",
1394 reg_read(recv->ohci, recv->ContextControlSet));
1395 return -1;
1396 }
1397
1398 return 0;
1399 }
1400
1401 static void ohci_iso_recv_release_block(struct ohci_iso_recv *recv, int block)
1402 {
1403 /* re-use the DMA descriptor for the block */
1404 /* by linking the previous descriptor to it */
1405
1406 int next_i = block;
1407 int prev_i = (next_i == 0) ? (recv->nblocks - 1) : (next_i - 1);
1408
1409 struct dma_cmd *next = &recv->block[next_i];
1410 struct dma_cmd *prev = &recv->block[prev_i];
1411
1412 /* ignore out-of-range requests */
1413 if ((block < 0) || (block > recv->nblocks))
1414 return;
1415
1416 /* 'next' becomes the new end of the DMA chain,
1417 so disable branch and enable interrupt */
1418 next->branchAddress = 0;
1419 next->control |= cpu_to_le32(3 << 20);
1420 next->status = cpu_to_le32(recv->buf_stride);
1421
1422 /* link prev to next */
1423 prev->branchAddress = cpu_to_le32(dma_prog_region_offset_to_bus(&recv->prog,
1424 sizeof(struct dma_cmd) * next_i)
1425 | 1); /* Z=1 */
1426
1427 /* disable interrupt on previous DMA descriptor, except at intervals */
1428 if ((prev_i % recv->block_irq_interval) == 0) {
1429 prev->control |= cpu_to_le32(3 << 20); /* enable interrupt */
1430 } else {
1431 prev->control &= cpu_to_le32(~(3<<20)); /* disable interrupt */
1432 }
1433 wmb();
1434
1435 /* wake up DMA in case it fell asleep */
1436 reg_write(recv->ohci, recv->ContextControlSet, (1 << 12));
1437 }
1438
1439 static void ohci_iso_recv_bufferfill_release(struct ohci_iso_recv *recv,
1440 struct hpsb_iso_packet_info *info)
1441 {
1442 /* release the memory where the packet was */
1443 recv->released_bytes += info->total_len;
1444
1445 /* have we released enough memory for one block? */
1446 while (recv->released_bytes > recv->buf_stride) {
1447 ohci_iso_recv_release_block(recv, recv->block_reader);
1448 recv->block_reader = (recv->block_reader + 1) % recv->nblocks;
1449 recv->released_bytes -= recv->buf_stride;
1450 }
1451 }
1452
1453 static inline void ohci_iso_recv_release(struct hpsb_iso *iso, struct hpsb_iso_packet_info *info)
1454 {
1455 struct ohci_iso_recv *recv = iso->hostdata;
1456 if (recv->dma_mode == BUFFER_FILL_MODE) {
1457 ohci_iso_recv_bufferfill_release(recv, info);
1458 } else {
1459 ohci_iso_recv_release_block(recv, info - iso->infos);
1460 }
1461 }
1462
1463 /* parse all packets from blocks that have been fully received */
1464 static void ohci_iso_recv_bufferfill_parse(struct hpsb_iso *iso, struct ohci_iso_recv *recv)
1465 {
1466 int wake = 0;
1467 int runaway = 0;
1468 struct ti_ohci *ohci = recv->ohci;
1469
1470 while (1) {
1471 /* we expect the next parsable packet to begin at recv->dma_offset */
1472 /* note: packet layout is as shown in section 10.6.1.1 of the OHCI spec */
1473
1474 unsigned int offset;
1475 unsigned short len, cycle, total_len;
1476 unsigned char channel, tag, sy;
1477
1478 unsigned char *p = iso->data_buf.kvirt;
1479
1480 unsigned int this_block = recv->dma_offset/recv->buf_stride;
1481
1482 /* don't loop indefinitely */
1483 if (runaway++ > 100000) {
1484 atomic_inc(&iso->overflows);
1485 PRINT(KERN_ERR,
1486 "IR DMA error - Runaway during buffer parsing!\n");
1487 break;
1488 }
1489
1490 /* stop parsing once we arrive at block_dma (i.e. don't get ahead of DMA) */
1491 if (this_block == recv->block_dma)
1492 break;
1493
1494 wake = 1;
1495
1496 /* parse data length, tag, channel, and sy */
1497
1498 /* note: we keep our own local copies of 'len' and 'offset'
1499 so the user can't mess with them by poking in the mmap area */
1500
1501 len = p[recv->dma_offset+2] | (p[recv->dma_offset+3] << 8);
1502
1503 if (len > 4096) {
1504 PRINT(KERN_ERR,
1505 "IR DMA error - bogus 'len' value %u\n", len);
1506 }
1507
1508 channel = p[recv->dma_offset+1] & 0x3F;
1509 tag = p[recv->dma_offset+1] >> 6;
1510 sy = p[recv->dma_offset+0] & 0xF;
1511
1512 /* advance to data payload */
1513 recv->dma_offset += 4;
1514
1515 /* check for wrap-around */
1516 if (recv->dma_offset >= recv->buf_stride*recv->nblocks) {
1517 recv->dma_offset -= recv->buf_stride*recv->nblocks;
1518 }
1519
1520 /* dma_offset now points to the first byte of the data payload */
1521 offset = recv->dma_offset;
1522
1523 /* advance to xferStatus/timeStamp */
1524 recv->dma_offset += len;
1525
1526 total_len = len + 8; /* 8 bytes header+trailer in OHCI packet */
1527 /* payload is padded to 4 bytes */
1528 if (len % 4) {
1529 recv->dma_offset += 4 - (len%4);
1530 total_len += 4 - (len%4);
1531 }
1532
1533 /* check for wrap-around */
1534 if (recv->dma_offset >= recv->buf_stride*recv->nblocks) {
1535 /* uh oh, the packet data wraps from the last
1536 to the first DMA block - make the packet
1537 contiguous by copying its "tail" into the
1538 guard page */
1539
1540 int guard_off = recv->buf_stride*recv->nblocks;
1541 int tail_len = len - (guard_off - offset);
1542
1543 if (tail_len > 0 && tail_len < recv->buf_stride) {
1544 memcpy(iso->data_buf.kvirt + guard_off,
1545 iso->data_buf.kvirt,
1546 tail_len);
1547 }
1548
1549 recv->dma_offset -= recv->buf_stride*recv->nblocks;
1550 }
1551
1552 /* parse timestamp */
1553 cycle = p[recv->dma_offset+0] | (p[recv->dma_offset+1]<<8);
1554 cycle &= 0x1FFF;
1555
1556 /* advance to next packet */
1557 recv->dma_offset += 4;
1558
1559 /* check for wrap-around */
1560 if (recv->dma_offset >= recv->buf_stride*recv->nblocks) {
1561 recv->dma_offset -= recv->buf_stride*recv->nblocks;
1562 }
1563
1564 hpsb_iso_packet_received(iso, offset, len, total_len, cycle, channel, tag, sy);
1565 }
1566
1567 if (wake)
1568 hpsb_iso_wake(iso);
1569 }
1570
1571 static void ohci_iso_recv_bufferfill_task(struct hpsb_iso *iso, struct ohci_iso_recv *recv)
1572 {
1573 int loop;
1574 struct ti_ohci *ohci = recv->ohci;
1575
1576 /* loop over all blocks */
1577 for (loop = 0; loop < recv->nblocks; loop++) {
1578
1579 /* check block_dma to see if it's done */
1580 struct dma_cmd *im = &recv->block[recv->block_dma];
1581
1582 /* check the DMA descriptor for new writes to xferStatus */
1583 u16 xferstatus = le32_to_cpu(im->status) >> 16;
1584
1585 /* rescount is the number of bytes *remaining to be written* in the block */
1586 u16 rescount = le32_to_cpu(im->status) & 0xFFFF;
1587
1588 unsigned char event = xferstatus & 0x1F;
1589
1590 if (!event) {
1591 /* nothing has happened to this block yet */
1592 break;
1593 }
1594
1595 if (event != 0x11) {
1596 atomic_inc(&iso->overflows);
1597 PRINT(KERN_ERR,
1598 "IR DMA error - OHCI error code 0x%02x\n", event);
1599 }
1600
1601 if (rescount != 0) {
1602 /* the card is still writing to this block;
1603 we can't touch it until it's done */
1604 break;
1605 }
1606
1607 /* OK, the block is finished... */
1608
1609 /* sync our view of the block */
1610 dma_region_sync_for_cpu(&iso->data_buf, recv->block_dma*recv->buf_stride, recv->buf_stride);
1611
1612 /* reset the DMA descriptor */
1613 im->status = recv->buf_stride;
1614
1615 /* advance block_dma */
1616 recv->block_dma = (recv->block_dma + 1) % recv->nblocks;
1617
1618 if ((recv->block_dma+1) % recv->nblocks == recv->block_reader) {
1619 atomic_inc(&iso->overflows);
1620 DBGMSG("ISO reception overflow - "
1621 "ran out of DMA blocks");
1622 }
1623 }
1624
1625 /* parse any packets that have arrived */
1626 ohci_iso_recv_bufferfill_parse(iso, recv);
1627 }
1628
1629 static void ohci_iso_recv_packetperbuf_task(struct hpsb_iso *iso, struct ohci_iso_recv *recv)
1630 {
1631 int count;
1632 int wake = 0;
1633 struct ti_ohci *ohci = recv->ohci;
1634
1635 /* loop over the entire buffer */
1636 for (count = 0; count < recv->nblocks; count++) {
1637 u32 packet_len = 0;
1638
1639 /* pointer to the DMA descriptor */
1640 struct dma_cmd *il = ((struct dma_cmd*) recv->prog.kvirt) + iso->pkt_dma;
1641
1642 /* check the DMA descriptor for new writes to xferStatus */
1643 u16 xferstatus = le32_to_cpu(il->status) >> 16;
1644 u16 rescount = le32_to_cpu(il->status) & 0xFFFF;
1645
1646 unsigned char event = xferstatus & 0x1F;
1647
1648 if (!event) {
1649 /* this packet hasn't come in yet; we are done for now */
1650 goto out;
1651 }
1652
1653 if (event == 0x11) {
1654 /* packet received successfully! */
1655
1656 /* rescount is the number of bytes *remaining* in the packet buffer,
1657 after the packet was written */
1658 packet_len = recv->buf_stride - rescount;
1659
1660 } else if (event == 0x02) {
1661 PRINT(KERN_ERR, "IR DMA error - packet too long for buffer\n");
1662 } else if (event) {
1663 PRINT(KERN_ERR, "IR DMA error - OHCI error code 0x%02x\n", event);
1664 }
1665
1666 /* sync our view of the buffer */
1667 dma_region_sync_for_cpu(&iso->data_buf, iso->pkt_dma * recv->buf_stride, recv->buf_stride);
1668
1669 /* record the per-packet info */
1670 {
1671 /* iso header is 8 bytes ahead of the data payload */
1672 unsigned char *hdr;
1673
1674 unsigned int offset;
1675 unsigned short cycle;
1676 unsigned char channel, tag, sy;
1677
1678 offset = iso->pkt_dma * recv->buf_stride;
1679 hdr = iso->data_buf.kvirt + offset;
1680
1681 /* skip iso header */
1682 offset += 8;
1683 packet_len -= 8;
1684
1685 cycle = (hdr[0] | (hdr[1] << 8)) & 0x1FFF;
1686 channel = hdr[5] & 0x3F;
1687 tag = hdr[5] >> 6;
1688 sy = hdr[4] & 0xF;
1689
1690 hpsb_iso_packet_received(iso, offset, packet_len,
1691 recv->buf_stride, cycle, channel, tag, sy);
1692 }
1693
1694 /* reset the DMA descriptor */
1695 il->status = recv->buf_stride;
1696
1697 wake = 1;
1698 recv->block_dma = iso->pkt_dma;
1699 }
1700
1701 out:
1702 if (wake)
1703 hpsb_iso_wake(iso);
1704 }
1705
1706 static void ohci_iso_recv_task(unsigned long data)
1707 {
1708 struct hpsb_iso *iso = (struct hpsb_iso*) data;
1709 struct ohci_iso_recv *recv = iso->hostdata;
1710
1711 if (recv->dma_mode == BUFFER_FILL_MODE)
1712 ohci_iso_recv_bufferfill_task(iso, recv);
1713 else
1714 ohci_iso_recv_packetperbuf_task(iso, recv);
1715 }
1716
1717 /***********************************
1718 * rawiso ISO transmission *
1719 ***********************************/
1720
1721 struct ohci_iso_xmit {
1722 struct ti_ohci *ohci;
1723 struct dma_prog_region prog;
1724 struct ohci1394_iso_tasklet task;
1725 int task_active;
1726
1727 u32 ContextControlSet;
1728 u32 ContextControlClear;
1729 u32 CommandPtr;
1730 };
1731
1732 /* transmission DMA program:
1733 one OUTPUT_MORE_IMMEDIATE for the IT header
1734 one OUTPUT_LAST for the buffer data */
1735
1736 struct iso_xmit_cmd {
1737 struct dma_cmd output_more_immediate;
1738 u8 iso_hdr[8];
1739 u32 unused[2];
1740 struct dma_cmd output_last;
1741 };
1742
1743 static int ohci_iso_xmit_init(struct hpsb_iso *iso);
1744 static int ohci_iso_xmit_start(struct hpsb_iso *iso, int cycle);
1745 static void ohci_iso_xmit_shutdown(struct hpsb_iso *iso);
1746 static void ohci_iso_xmit_task(unsigned long data);
1747
1748 static int ohci_iso_xmit_init(struct hpsb_iso *iso)
1749 {
1750 struct ohci_iso_xmit *xmit;
1751 unsigned int prog_size;
1752 int ctx;
1753 int ret = -ENOMEM;
1754
1755 xmit = kmalloc(sizeof(*xmit), GFP_KERNEL);
1756 if (!xmit)
1757 return -ENOMEM;
1758
1759 iso->hostdata = xmit;
1760 xmit->ohci = iso->host->hostdata;
1761 xmit->task_active = 0;
1762
1763 dma_prog_region_init(&xmit->prog);
1764
1765 prog_size = sizeof(struct iso_xmit_cmd) * iso->buf_packets;
1766
1767 if (dma_prog_region_alloc(&xmit->prog, prog_size, xmit->ohci->dev))
1768 goto err;
1769
1770 ohci1394_init_iso_tasklet(&xmit->task, OHCI_ISO_TRANSMIT,
1771 ohci_iso_xmit_task, (unsigned long) iso);
1772
1773 if (ohci1394_register_iso_tasklet(xmit->ohci, &xmit->task) < 0) {
1774 ret = -EBUSY;
1775 goto err;
1776 }
1777
1778 xmit->task_active = 1;
1779
1780 /* xmit context registers are spaced 16 bytes apart */
1781 ctx = xmit->task.context;
1782 xmit->ContextControlSet = OHCI1394_IsoXmitContextControlSet + 16 * ctx;
1783 xmit->ContextControlClear = OHCI1394_IsoXmitContextControlClear + 16 * ctx;
1784 xmit->CommandPtr = OHCI1394_IsoXmitCommandPtr + 16 * ctx;
1785
1786 return 0;
1787
1788 err:
1789 ohci_iso_xmit_shutdown(iso);
1790 return ret;
1791 }
1792
1793 static void ohci_iso_xmit_stop(struct hpsb_iso *iso)
1794 {
1795 struct ohci_iso_xmit *xmit = iso->hostdata;
1796 struct ti_ohci *ohci = xmit->ohci;
1797
1798 /* disable interrupts */
1799 reg_write(xmit->ohci, OHCI1394_IsoXmitIntMaskClear, 1 << xmit->task.context);
1800
1801 /* halt DMA */
1802 if (ohci1394_stop_context(xmit->ohci, xmit->ContextControlClear, NULL)) {
1803 /* XXX the DMA context will lock up if you try to send too much data! */
1804 PRINT(KERN_ERR,
1805 "you probably exceeded the OHCI card's bandwidth limit - "
1806 "reload the module and reduce xmit bandwidth");
1807 }
1808 }
1809
1810 static void ohci_iso_xmit_shutdown(struct hpsb_iso *iso)
1811 {
1812 struct ohci_iso_xmit *xmit = iso->hostdata;
1813
1814 if (xmit->task_active) {
1815 ohci_iso_xmit_stop(iso);
1816 ohci1394_unregister_iso_tasklet(xmit->ohci, &xmit->task);
1817 xmit->task_active = 0;
1818 }
1819
1820 dma_prog_region_free(&xmit->prog);
1821 kfree(xmit);
1822 iso->hostdata = NULL;
1823 }
1824
1825 static void ohci_iso_xmit_task(unsigned long data)
1826 {
1827 struct hpsb_iso *iso = (struct hpsb_iso*) data;
1828 struct ohci_iso_xmit *xmit = iso->hostdata;
1829 struct ti_ohci *ohci = xmit->ohci;
1830 int wake = 0;
1831 int count;
1832
1833 /* check the whole buffer if necessary, starting at pkt_dma */
1834 for (count = 0; count < iso->buf_packets; count++) {
1835 int cycle;
1836
1837 /* DMA descriptor */
1838 struct iso_xmit_cmd *cmd = dma_region_i(&xmit->prog, struct iso_xmit_cmd, iso->pkt_dma);
1839
1840 /* check for new writes to xferStatus */
1841 u16 xferstatus = le32_to_cpu(cmd->output_last.status) >> 16;
1842 u8 event = xferstatus & 0x1F;
1843
1844 if (!event) {
1845 /* packet hasn't been sent yet; we are done for now */
1846 break;
1847 }
1848
1849 if (event != 0x11)
1850 PRINT(KERN_ERR,
1851 "IT DMA error - OHCI error code 0x%02x\n", event);
1852
1853 /* at least one packet went out, so wake up the writer */
1854 wake = 1;
1855
1856 /* parse cycle */
1857 cycle = le32_to_cpu(cmd->output_last.status) & 0x1FFF;
1858
1859 /* tell the subsystem the packet has gone out */
1860 hpsb_iso_packet_sent(iso, cycle, event != 0x11);
1861
1862 /* reset the DMA descriptor for next time */
1863 cmd->output_last.status = 0;
1864 }
1865
1866 if (wake)
1867 hpsb_iso_wake(iso);
1868 }
1869
1870 static int ohci_iso_xmit_queue(struct hpsb_iso *iso, struct hpsb_iso_packet_info *info)
1871 {
1872 struct ohci_iso_xmit *xmit = iso->hostdata;
1873 struct ti_ohci *ohci = xmit->ohci;
1874
1875 int next_i, prev_i;
1876 struct iso_xmit_cmd *next, *prev;
1877
1878 unsigned int offset;
1879 unsigned short len;
1880 unsigned char tag, sy;
1881
1882 /* check that the packet doesn't cross a page boundary
1883 (we could allow this if we added OUTPUT_MORE descriptor support) */
1884 if (cross_bound(info->offset, info->len)) {
1885 PRINT(KERN_ERR,
1886 "rawiso xmit: packet %u crosses a page boundary",
1887 iso->first_packet);
1888 return -EINVAL;
1889 }
1890
1891 offset = info->offset;
1892 len = info->len;
1893 tag = info->tag;
1894 sy = info->sy;
1895
1896 /* sync up the card's view of the buffer */
1897 dma_region_sync_for_device(&iso->data_buf, offset, len);
1898
1899 /* append first_packet to the DMA chain */
1900 /* by linking the previous descriptor to it */
1901 /* (next will become the new end of the DMA chain) */
1902
1903 next_i = iso->first_packet;
1904 prev_i = (next_i == 0) ? (iso->buf_packets - 1) : (next_i - 1);
1905
1906 next = dma_region_i(&xmit->prog, struct iso_xmit_cmd, next_i);
1907 prev = dma_region_i(&xmit->prog, struct iso_xmit_cmd, prev_i);
1908
1909 /* set up the OUTPUT_MORE_IMMEDIATE descriptor */
1910 memset(next, 0, sizeof(struct iso_xmit_cmd));
1911 next->output_more_immediate.control = cpu_to_le32(0x02000008);
1912
1913 /* ISO packet header is embedded in the OUTPUT_MORE_IMMEDIATE */
1914
1915 /* tcode = 0xA, and sy */
1916 next->iso_hdr[0] = 0xA0 | (sy & 0xF);
1917
1918 /* tag and channel number */
1919 next->iso_hdr[1] = (tag << 6) | (iso->channel & 0x3F);
1920
1921 /* transmission speed */
1922 next->iso_hdr[2] = iso->speed & 0x7;
1923
1924 /* payload size */
1925 next->iso_hdr[6] = len & 0xFF;
1926 next->iso_hdr[7] = len >> 8;
1927
1928 /* set up the OUTPUT_LAST */
1929 next->output_last.control = cpu_to_le32(1 << 28);
1930 next->output_last.control |= cpu_to_le32(1 << 27); /* update timeStamp */
1931 next->output_last.control |= cpu_to_le32(3 << 20); /* want interrupt */
1932 next->output_last.control |= cpu_to_le32(3 << 18); /* enable branch */
1933 next->output_last.control |= cpu_to_le32(len);
1934
1935 /* payload bus address */
1936 next->output_last.address = cpu_to_le32(dma_region_offset_to_bus(&iso->data_buf, offset));
1937
1938 /* leave branchAddress at zero for now */
1939
1940 /* re-write the previous DMA descriptor to chain to this one */
1941
1942 /* set prev branch address to point to next (Z=3) */
1943 prev->output_last.branchAddress = cpu_to_le32(
1944 dma_prog_region_offset_to_bus(&xmit->prog, sizeof(struct iso_xmit_cmd) * next_i) | 3);
1945
1946 /* disable interrupt, unless required by the IRQ interval */
1947 if (prev_i % iso->irq_interval) {
1948 prev->output_last.control &= cpu_to_le32(~(3 << 20)); /* no interrupt */
1949 } else {
1950 prev->output_last.control |= cpu_to_le32(3 << 20); /* enable interrupt */
1951 }
1952
1953 wmb();
1954
1955 /* wake DMA in case it is sleeping */
1956 reg_write(xmit->ohci, xmit->ContextControlSet, 1 << 12);
1957
1958 /* issue a dummy read of the cycle timer to force all PCI
1959 writes to be posted immediately */
1960 mb();
1961 reg_read(xmit->ohci, OHCI1394_IsochronousCycleTimer);
1962
1963 return 0;
1964 }
1965
1966 static int ohci_iso_xmit_start(struct hpsb_iso *iso, int cycle)
1967 {
1968 struct ohci_iso_xmit *xmit = iso->hostdata;
1969 struct ti_ohci *ohci = xmit->ohci;
1970
1971 /* clear out the control register */
1972 reg_write(xmit->ohci, xmit->ContextControlClear, 0xFFFFFFFF);
1973 wmb();
1974
1975 /* address and length of first descriptor block (Z=3) */
1976 reg_write(xmit->ohci, xmit->CommandPtr,
1977 dma_prog_region_offset_to_bus(&xmit->prog, iso->pkt_dma * sizeof(struct iso_xmit_cmd)) | 3);
1978
1979 /* cycle match */
1980 if (cycle != -1) {
1981 u32 start = cycle & 0x1FFF;
1982
1983 /* 'cycle' is only mod 8000, but we also need two 'seconds' bits -
1984 just snarf them from the current time */
1985 u32 seconds = reg_read(xmit->ohci, OHCI1394_IsochronousCycleTimer) >> 25;
1986
1987 /* advance one second to give some extra time for DMA to start */
1988 seconds += 1;
1989
1990 start |= (seconds & 3) << 13;
1991
1992 reg_write(xmit->ohci, xmit->ContextControlSet, 0x80000000 | (start << 16));
1993 }
1994
1995 /* enable interrupts */
1996 reg_write(xmit->ohci, OHCI1394_IsoXmitIntMaskSet, 1 << xmit->task.context);
1997
1998 /* run */
1999 reg_write(xmit->ohci, xmit->ContextControlSet, 0x8000);
2000 mb();
2001
2002 /* wait 100 usec to give the card time to go active */
2003 udelay(100);
2004
2005 /* check the RUN bit */
2006 if (!(reg_read(xmit->ohci, xmit->ContextControlSet) & 0x8000)) {
2007 PRINT(KERN_ERR, "Error starting IT DMA (ContextControl 0x%08x)\n",
2008 reg_read(xmit->ohci, xmit->ContextControlSet));
2009 return -1;
2010 }
2011
2012 return 0;
2013 }
2014
2015 static int ohci_isoctl(struct hpsb_iso *iso, enum isoctl_cmd cmd, unsigned long arg)
2016 {
2017
2018 switch(cmd) {
2019 case XMIT_INIT:
2020 return ohci_iso_xmit_init(iso);
2021 case XMIT_START:
2022 return ohci_iso_xmit_start(iso, arg);
2023 case XMIT_STOP:
2024 ohci_iso_xmit_stop(iso);
2025 return 0;
2026 case XMIT_QUEUE:
2027 return ohci_iso_xmit_queue(iso, (struct hpsb_iso_packet_info*) arg);
2028 case XMIT_SHUTDOWN:
2029 ohci_iso_xmit_shutdown(iso);
2030 return 0;
2031
2032 case RECV_INIT:
2033 return ohci_iso_recv_init(iso);
2034 case RECV_START: {
2035 int *args = (int*) arg;
2036 return ohci_iso_recv_start(iso, args[0], args[1], args[2]);
2037 }
2038 case RECV_STOP:
2039 ohci_iso_recv_stop(iso);
2040 return 0;
2041 case RECV_RELEASE:
2042 ohci_iso_recv_release(iso, (struct hpsb_iso_packet_info*) arg);
2043 return 0;
2044 case RECV_FLUSH:
2045 ohci_iso_recv_task((unsigned long) iso);
2046 return 0;
2047 case RECV_SHUTDOWN:
2048 ohci_iso_recv_shutdown(iso);
2049 return 0;
2050 case RECV_LISTEN_CHANNEL:
2051 ohci_iso_recv_change_channel(iso, arg, 1);
2052 return 0;
2053 case RECV_UNLISTEN_CHANNEL:
2054 ohci_iso_recv_change_channel(iso, arg, 0);
2055 return 0;
2056 case RECV_SET_CHANNEL_MASK:
2057 ohci_iso_recv_set_channel_mask(iso, *((u64*) arg));
2058 return 0;
2059
2060 default:
2061 PRINT_G(KERN_ERR, "ohci_isoctl cmd %d not implemented yet",
2062 cmd);
2063 break;
2064 }
2065 return -EINVAL;
2066 }
2067
2068 /***************************************
2069 * IEEE-1394 functionality section END *
2070 ***************************************/
2071
2072
2073 /********************************************************
2074 * Global stuff (interrupt handler, init/shutdown code) *
2075 ********************************************************/
2076
2077 static void dma_trm_reset(struct dma_trm_ctx *d)
2078 {
2079 unsigned long flags;
2080 LIST_HEAD(packet_list);
2081 struct ti_ohci *ohci = d->ohci;
2082 struct hpsb_packet *packet, *ptmp;
2083
2084 ohci1394_stop_context(ohci, d->ctrlClear, NULL);
2085
2086 /* Lock the context, reset it and release it. Move the packets
2087 * that were pending in the context to packet_list and free
2088 * them after releasing the lock. */
2089
2090 spin_lock_irqsave(&d->lock, flags);
2091
2092 list_splice(&d->fifo_list, &packet_list);
2093 list_splice(&d->pending_list, &packet_list);
2094 INIT_LIST_HEAD(&d->fifo_list);
2095 INIT_LIST_HEAD(&d->pending_list);
2096
2097 d->branchAddrPtr = NULL;
2098 d->sent_ind = d->prg_ind;
2099 d->free_prgs = d->num_desc;
2100
2101 spin_unlock_irqrestore(&d->lock, flags);
2102
2103 if (list_empty(&packet_list))
2104 return;
2105
2106 PRINT(KERN_INFO, "AT dma reset ctx=%d, aborting transmission", d->ctx);
2107
2108 /* Now process subsystem callbacks for the packets from this
2109 * context. */
2110 list_for_each_entry_safe(packet, ptmp, &packet_list, driver_list) {
2111 list_del_init(&packet->driver_list);
2112 hpsb_packet_sent(ohci->host, packet, ACKX_ABORTED);
2113 }
2114 }
2115
2116 static void ohci_schedule_iso_tasklets(struct ti_ohci *ohci,
2117 quadlet_t rx_event,
2118 quadlet_t tx_event)
2119 {
2120 struct ohci1394_iso_tasklet *t;
2121 unsigned long mask;
2122 unsigned long flags;
2123
2124 spin_lock_irqsave(&ohci->iso_tasklet_list_lock, flags);
2125
2126 list_for_each_entry(t, &ohci->iso_tasklet_list, link) {
2127 mask = 1 << t->context;
2128
2129 if (t->type == OHCI_ISO_TRANSMIT && tx_event & mask)
2130 tasklet_schedule(&t->tasklet);
2131 else if (rx_event & mask)
2132 tasklet_schedule(&t->tasklet);
2133 }
2134
2135 spin_unlock_irqrestore(&ohci->iso_tasklet_list_lock, flags);
2136 }
2137
2138 static irqreturn_t ohci_irq_handler(int irq, void *dev_id)
2139 {
2140 quadlet_t event, node_id;
2141 struct ti_ohci *ohci = (struct ti_ohci *)dev_id;
2142 struct hpsb_host *host = ohci->host;
2143 int phyid = -1, isroot = 0;
2144 unsigned long flags;
2145
2146 /* Read and clear the interrupt event register. Don't clear
2147 * the busReset event, though. This is done when we get the
2148 * selfIDComplete interrupt. */
2149 spin_lock_irqsave(&ohci->event_lock, flags);
2150 event = reg_read(ohci, OHCI1394_IntEventClear);
2151 reg_write(ohci, OHCI1394_IntEventClear, event & ~OHCI1394_busReset);
2152 spin_unlock_irqrestore(&ohci->event_lock, flags);
2153
2154 if (!event)
2155 return IRQ_NONE;
2156
2157 /* If event is ~(u32)0 cardbus card was ejected. In this case
2158 * we just return, and clean up in the ohci1394_pci_remove
2159 * function. */
2160 if (event == ~(u32) 0) {
2161 DBGMSG("Device removed.");
2162 return IRQ_NONE;
2163 }
2164
2165 DBGMSG("IntEvent: %08x", event);
2166
2167 if (event & OHCI1394_unrecoverableError) {
2168 int ctx;
2169 PRINT(KERN_ERR, "Unrecoverable error!");
2170
2171 if (reg_read(ohci, OHCI1394_AsReqTrContextControlSet) & 0x800)
2172 PRINT(KERN_ERR, "Async Req Tx Context died: "
2173 "ctrl[%08x] cmdptr[%08x]",
2174 reg_read(ohci, OHCI1394_AsReqTrContextControlSet),
2175 reg_read(ohci, OHCI1394_AsReqTrCommandPtr));
2176
2177 if (reg_read(ohci, OHCI1394_AsRspTrContextControlSet) & 0x800)
2178 PRINT(KERN_ERR, "Async Rsp Tx Context died: "
2179 "ctrl[%08x] cmdptr[%08x]",
2180 reg_read(ohci, OHCI1394_AsRspTrContextControlSet),
2181 reg_read(ohci, OHCI1394_AsRspTrCommandPtr));
2182
2183 if (reg_read(ohci, OHCI1394_AsReqRcvContextControlSet) & 0x800)
2184 PRINT(KERN_ERR, "Async Req Rcv Context died: "
2185 "ctrl[%08x] cmdptr[%08x]",
2186 reg_read(ohci, OHCI1394_AsReqRcvContextControlSet),
2187 reg_read(ohci, OHCI1394_AsReqRcvCommandPtr));
2188
2189 if (reg_read(ohci, OHCI1394_AsRspRcvContextControlSet) & 0x800)
2190 PRINT(KERN_ERR, "Async Rsp Rcv Context died: "
2191 "ctrl[%08x] cmdptr[%08x]",
2192 reg_read(ohci, OHCI1394_AsRspRcvContextControlSet),
2193 reg_read(ohci, OHCI1394_AsRspRcvCommandPtr));
2194
2195 for (ctx = 0; ctx < ohci->nb_iso_xmit_ctx; ctx++) {
2196 if (reg_read(ohci, OHCI1394_IsoXmitContextControlSet + (16 * ctx)) & 0x800)
2197 PRINT(KERN_ERR, "Iso Xmit %d Context died: "
2198 "ctrl[%08x] cmdptr[%08x]", ctx,
2199 reg_read(ohci, OHCI1394_IsoXmitContextControlSet + (16 * ctx)),
2200 reg_read(ohci, OHCI1394_IsoXmitCommandPtr + (16 * ctx)));
2201 }
2202
2203 for (ctx = 0; ctx < ohci->nb_iso_rcv_ctx; ctx++) {
2204 if (reg_read(ohci, OHCI1394_IsoRcvContextControlSet + (32 * ctx)) & 0x800)
2205 PRINT(KERN_ERR, "Iso Recv %d Context died: "
2206 "ctrl[%08x] cmdptr[%08x] match[%08x]", ctx,
2207 reg_read(ohci, OHCI1394_IsoRcvContextControlSet + (32 * ctx)),
2208 reg_read(ohci, OHCI1394_IsoRcvCommandPtr + (32 * ctx)),
2209 reg_read(ohci, OHCI1394_IsoRcvContextMatch + (32 * ctx)));
2210 }
2211
2212 event &= ~OHCI1394_unrecoverableError;
2213 }
2214 if (event & OHCI1394_postedWriteErr) {
2215 PRINT(KERN_ERR, "physical posted write error");
2216 /* no recovery strategy yet, had to involve protocol drivers */
2217 event &= ~OHCI1394_postedWriteErr;
2218 }
2219 if (event & OHCI1394_cycleTooLong) {
2220 if(printk_ratelimit())
2221 PRINT(KERN_WARNING, "isochronous cycle too long");
2222 else
2223 DBGMSG("OHCI1394_cycleTooLong");
2224 reg_write(ohci, OHCI1394_LinkControlSet,
2225 OHCI1394_LinkControl_CycleMaster);
2226 event &= ~OHCI1394_cycleTooLong;
2227 }
2228 if (event & OHCI1394_cycleInconsistent) {
2229 /* We subscribe to the cycleInconsistent event only to
2230 * clear the corresponding event bit... otherwise,
2231 * isochronous cycleMatch DMA won't work. */
2232 DBGMSG("OHCI1394_cycleInconsistent");
2233 event &= ~OHCI1394_cycleInconsistent;
2234 }
2235 if (event & OHCI1394_busReset) {
2236 /* The busReset event bit can't be cleared during the
2237 * selfID phase, so we disable busReset interrupts, to
2238 * avoid burying the cpu in interrupt requests. */
2239 spin_lock_irqsave(&ohci->event_lock, flags);
2240 reg_write(ohci, OHCI1394_IntMaskClear, OHCI1394_busReset);
2241
2242 if (ohci->check_busreset) {
2243 int loop_count = 0;
2244
2245 udelay(10);
2246
2247 while (reg_read(ohci, OHCI1394_IntEventSet) & OHCI1394_busReset) {
2248 reg_write(ohci, OHCI1394_IntEventClear, OHCI1394_busReset);
2249
2250 spin_unlock_irqrestore(&ohci->event_lock, flags);
2251 udelay(10);
2252 spin_lock_irqsave(&ohci->event_lock, flags);
2253
2254 /* The loop counter check is to prevent the driver
2255 * from remaining in this state forever. For the
2256 * initial bus reset, the loop continues for ever
2257 * and the system hangs, until some device is plugged-in
2258 * or out manually into a port! The forced reset seems
2259 * to solve this problem. This mainly effects nForce2. */
2260 if (loop_count > 10000) {
2261 ohci_devctl(host, RESET_BUS, LONG_RESET);
2262 DBGMSG("Detected bus-reset loop. Forced a bus reset!");
2263 loop_count = 0;
2264 }
2265
2266 loop_count++;
2267 }
2268 }
2269 spin_unlock_irqrestore(&ohci->event_lock, flags);
2270 if (!host->in_bus_reset) {
2271 DBGMSG("irq_handler: Bus reset requested");
2272
2273 /* Subsystem call */
2274 hpsb_bus_reset(ohci->host);
2275 }
2276 event &= ~OHCI1394_busReset;
2277 }
2278 if (event & OHCI1394_reqTxComplete) {
2279 struct dma_trm_ctx *d = &ohci->at_req_context;
2280 DBGMSG("Got reqTxComplete interrupt "
2281 "status=0x%08X", reg_read(ohci, d->ctrlSet));
2282 if (reg_read(ohci, d->ctrlSet) & 0x800)
2283 ohci1394_stop_context(ohci, d->ctrlClear,
2284 "reqTxComplete");
2285 else
2286 dma_trm_tasklet((unsigned long)d);
2287 //tasklet_schedule(&d->task);
2288 event &= ~OHCI1394_reqTxComplete;
2289 }
2290 if (event & OHCI1394_respTxComplete) {
2291 struct dma_trm_ctx *d = &ohci->at_resp_context;
2292 DBGMSG("Got respTxComplete interrupt "
2293 "status=0x%08X", reg_read(ohci, d->ctrlSet));
2294 if (reg_read(ohci, d->ctrlSet) & 0x800)
2295 ohci1394_stop_context(ohci, d->ctrlClear,
2296 "respTxComplete");
2297 else
2298 tasklet_schedule(&d->task);
2299 event &= ~OHCI1394_respTxComplete;
2300 }
2301 if (event & OHCI1394_RQPkt) {
2302 struct dma_rcv_ctx *d = &ohci->ar_req_context;
2303 DBGMSG("Got RQPkt interrupt status=0x%08X",
2304 reg_read(ohci, d->ctrlSet));
2305 if (reg_read(ohci, d->ctrlSet) & 0x800)
2306 ohci1394_stop_context(ohci, d->ctrlClear, "RQPkt");
2307 else
2308 tasklet_schedule(&d->task);
2309 event &= ~OHCI1394_RQPkt;
2310 }
2311 if (event & OHCI1394_RSPkt) {
2312 struct dma_rcv_ctx *d = &ohci->ar_resp_context;
2313 DBGMSG("Got RSPkt interrupt status=0x%08X",
2314 reg_read(ohci, d->ctrlSet));
2315 if (reg_read(ohci, d->ctrlSet) & 0x800)
2316 ohci1394_stop_context(ohci, d->ctrlClear, "RSPkt");
2317 else
2318 tasklet_schedule(&d->task);
2319 event &= ~OHCI1394_RSPkt;
2320 }
2321 if (event & OHCI1394_isochRx) {
2322 quadlet_t rx_event;
2323
2324 rx_event = reg_read(ohci, OHCI1394_IsoRecvIntEventSet);
2325 reg_write(ohci, OHCI1394_IsoRecvIntEventClear, rx_event);
2326 ohci_schedule_iso_tasklets(ohci, rx_event, 0);
2327 event &= ~OHCI1394_isochRx;
2328 }
2329 if (event & OHCI1394_isochTx) {
2330 quadlet_t tx_event;
2331
2332 tx_event = reg_read(ohci, OHCI1394_IsoXmitIntEventSet);
2333 reg_write(ohci, OHCI1394_IsoXmitIntEventClear, tx_event);
2334 ohci_schedule_iso_tasklets(ohci, 0, tx_event);
2335 event &= ~OHCI1394_isochTx;
2336 }
2337 if (event & OHCI1394_selfIDComplete) {
2338 if (host->in_bus_reset) {
2339 node_id = reg_read(ohci, OHCI1394_NodeID);
2340
2341 if (!(node_id & 0x80000000)) {
2342 PRINT(KERN_ERR,
2343 "SelfID received, but NodeID invalid "
2344 "(probably new bus reset occurred): %08X",
2345 node_id);
2346 goto selfid_not_valid;
2347 }
2348
2349 phyid = node_id & 0x0000003f;
2350 isroot = (node_id & 0x40000000) != 0;
2351
2352 DBGMSG("SelfID interrupt received "
2353 "(phyid %d, %s)", phyid,
2354 (isroot ? "root" : "not root"));
2355
2356 handle_selfid(ohci, host, phyid, isroot);
2357
2358 /* Clear the bus reset event and re-enable the
2359 * busReset interrupt. */
2360 spin_lock_irqsave(&ohci->event_lock, flags);
2361 reg_write(ohci, OHCI1394_IntEventClear, OHCI1394_busReset);
2362 reg_write(ohci, OHCI1394_IntMaskSet, OHCI1394_busReset);
2363 spin_unlock_irqrestore(&ohci->event_lock, flags);
2364
2365 /* Turn on phys dma reception.
2366 *
2367 * TODO: Enable some sort of filtering management.
2368 */
2369 if (phys_dma) {
2370 reg_write(ohci, OHCI1394_PhyReqFilterHiSet,
2371 0xffffffff);
2372 reg_write(ohci, OHCI1394_PhyReqFilterLoSet,
2373 0xffffffff);
2374 }
2375
2376 DBGMSG("PhyReqFilter=%08x%08x",
2377 reg_read(ohci, OHCI1394_PhyReqFilterHiSet),
2378 reg_read(ohci, OHCI1394_PhyReqFilterLoSet));
2379
2380 hpsb_selfid_complete(host, phyid, isroot);
2381 } else
2382 PRINT(KERN_ERR,
2383 "SelfID received outside of bus reset sequence");
2384
2385 selfid_not_valid:
2386 event &= ~OHCI1394_selfIDComplete;
2387 }
2388
2389 /* Make sure we handle everything, just in case we accidentally
2390 * enabled an interrupt that we didn't write a handler for. */
2391 if (event)
2392 PRINT(KERN_ERR, "Unhandled interrupt(s) 0x%08x",
2393 event);
2394
2395 return IRQ_HANDLED;
2396 }
2397
2398 /* Put the buffer back into the dma context */
2399 static void insert_dma_buffer(struct dma_rcv_ctx *d, int idx)
2400 {
2401 struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
2402 DBGMSG("Inserting dma buf ctx=%d idx=%d", d->ctx, idx);
2403
2404 d->prg_cpu[idx]->status = cpu_to_le32(d->buf_size);
2405 d->prg_cpu[idx]->branchAddress &= le32_to_cpu(0xfffffff0);
2406 idx = (idx + d->num_desc - 1 ) % d->num_desc;
2407 d->prg_cpu[idx]->branchAddress |= le32_to_cpu(0x00000001);
2408
2409 /* To avoid a race, ensure 1394 interface hardware sees the inserted
2410 * context program descriptors before it sees the wakeup bit set. */
2411 wmb();
2412
2413 /* wake up the dma context if necessary */
2414 if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
2415 PRINT(KERN_INFO,
2416 "Waking dma ctx=%d ... processing is probably too slow",
2417 d->ctx);
2418 }
2419
2420 /* do this always, to avoid race condition */
2421 reg_write(ohci, d->ctrlSet, 0x1000);
2422 }
2423
2424 #define cond_le32_to_cpu(data, noswap) \
2425 (noswap ? data : le32_to_cpu(data))
2426
2427 static const int TCODE_SIZE[16] = {20, 0, 16, -1, 16, 20, 20, 0,
2428 -1, 0, -1, 0, -1, -1, 16, -1};
2429
2430 /*
2431 * Determine the length of a packet in the buffer
2432 * Optimization suggested by Pascal Drolet <pascal.drolet@informission.ca>
2433 */
2434 static inline int packet_length(struct dma_rcv_ctx *d, int idx,
2435 quadlet_t *buf_ptr, int offset,
2436 unsigned char tcode, int noswap)
2437 {
2438 int length = -1;
2439
2440 if (d->type == DMA_CTX_ASYNC_REQ || d->type == DMA_CTX_ASYNC_RESP) {
2441 length = TCODE_SIZE[tcode];
2442 if (length == 0) {
2443 if (offset + 12 >= d->buf_size) {
2444 length = (cond_le32_to_cpu(d->buf_cpu[(idx + 1) % d->num_desc]
2445 [3 - ((d->buf_size - offset) >> 2)], noswap) >> 16);
2446 } else {
2447 length = (cond_le32_to_cpu(buf_ptr[3], noswap) >> 16);
2448 }
2449 length += 20;
2450 }
2451 } else if (d->type == DMA_CTX_ISO) {
2452 /* Assumption: buffer fill mode with header/trailer */
2453 length = (cond_le32_to_cpu(buf_ptr[0], noswap) >> 16) + 8;
2454 }
2455
2456 if (length > 0 && length % 4)
2457 length += 4 - (length % 4);
2458
2459 return length;
2460 }
2461
2462 /* Tasklet that processes dma receive buffers */
2463 static void dma_rcv_tasklet (unsigned long data)
2464 {
2465 struct dma_rcv_ctx *d = (struct dma_rcv_ctx*)data;
2466 struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
2467 unsigned int split_left, idx, offset, rescount;
2468 unsigned char tcode;
2469 int length, bytes_left, ack;
2470 unsigned long flags;
2471 quadlet_t *buf_ptr;
2472 char *split_ptr;
2473 char msg[256];
2474
2475 spin_lock_irqsave(&d->lock, flags);
2476
2477 idx = d->buf_ind;
2478 offset = d->buf_offset;
2479 buf_ptr = d->buf_cpu[idx] + offset/4;
2480
2481 rescount = le32_to_cpu(d->prg_cpu[idx]->status) & 0xffff;
2482 bytes_left = d->buf_size - rescount - offset;
2483
2484 while (bytes_left > 0) {
2485 tcode = (cond_le32_to_cpu(buf_ptr[0], ohci->no_swap_incoming) >> 4) & 0xf;
2486
2487 /* packet_length() will return < 4 for an error */
2488 length = packet_length(d, idx, buf_ptr, offset, tcode, ohci->no_swap_incoming);
2489
2490 if (length < 4) { /* something is wrong */
2491 sprintf(msg,"Unexpected tcode 0x%x(0x%08x) in AR ctx=%d, length=%d",
2492 tcode, cond_le32_to_cpu(buf_ptr[0], ohci->no_swap_incoming),
2493 d->ctx, length);
2494 ohci1394_stop_context(ohci, d->ctrlClear, msg);
2495 spin_unlock_irqrestore(&d->lock, flags);
2496 return;
2497 }
2498
2499 /* The first case is where we have a packet that crosses
2500 * over more than one descriptor. The next case is where
2501 * it's all in the first descriptor. */
2502 if ((offset + length) > d->buf_size) {
2503 DBGMSG("Split packet rcv'd");
2504 if (length > d->split_buf_size) {
2505 ohci1394_stop_context(ohci, d->ctrlClear,
2506 "Split packet size exceeded");
2507 d->buf_ind = idx;
2508 d->buf_offset = offset;
2509 spin_unlock_irqrestore(&d->lock, flags);
2510 return;
2511 }
2512
2513 if (le32_to_cpu(d->prg_cpu[(idx+1)%d->num_desc]->status)
2514 == d->buf_size) {
2515 /* Other part of packet not written yet.
2516 * this should never happen I think
2517 * anyway we'll get it on the next call. */
2518 PRINT(KERN_INFO,
2519 "Got only half a packet!");
2520 d->buf_ind = idx;
2521 d->buf_offset = offset;
2522 spin_unlock_irqrestore(&d->lock, flags);
2523 return;
2524 }
2525
2526 split_left = length;
2527 split_ptr = (char *)d->spb;
2528 memcpy(split_ptr,buf_ptr,d->buf_size-offset);
2529 split_left -= d->buf_size-offset;
2530 split_ptr += d->buf_size-offset;
2531 insert_dma_buffer(d, idx);
2532 idx = (idx+1) % d->num_desc;
2533 buf_ptr = d->buf_cpu[idx];
2534 offset=0;
2535
2536 while (split_left >= d->buf_size) {
2537 memcpy(split_ptr,buf_ptr,d->buf_size);
2538 split_ptr += d->buf_size;
2539 split_left -= d->buf_size;
2540 insert_dma_buffer(d, idx);
2541 idx = (idx+1) % d->num_desc;
2542 buf_ptr = d->buf_cpu[idx];
2543 }
2544
2545 if (split_left > 0) {
2546 memcpy(split_ptr, buf_ptr, split_left);
2547 offset = split_left;
2548 buf_ptr += offset/4;
2549 }
2550 } else {
2551 DBGMSG("Single packet rcv'd");
2552 memcpy(d->spb, buf_ptr, length);
2553 offset += length;
2554 buf_ptr += length/4;
2555 if (offset==d->buf_size) {
2556 insert_dma_buffer(d, idx);
2557 idx = (idx+1) % d->num_desc;
2558 buf_ptr = d->buf_cpu[idx];
2559 offset=0;
2560 }
2561 }
2562
2563 /* We get one phy packet to the async descriptor for each
2564 * bus reset. We always ignore it. */
2565 if (tcode != OHCI1394_TCODE_PHY) {
2566 if (!ohci->no_swap_incoming)
2567 header_le32_to_cpu(d->spb, tcode);
2568 DBGMSG("Packet received from node"
2569 " %d ack=0x%02X spd=%d tcode=0x%X"
2570 " length=%d ctx=%d tlabel=%d",
2571 (d->spb[1]>>16)&0x3f,
2572 (cond_le32_to_cpu(d->spb[length/4-1], ohci->no_swap_incoming)>>16)&0x1f,
2573 (cond_le32_to_cpu(d->spb[length/4-1], ohci->no_swap_incoming)>>21)&0x3,
2574 tcode, length, d->ctx,
2575 (d->spb[0]>>10)&0x3f);
2576
2577 ack = (((cond_le32_to_cpu(d->spb[length/4-1], ohci->no_swap_incoming)>>16)&0x1f)
2578 == 0x11) ? 1 : 0;
2579
2580 hpsb_packet_received(ohci->host, d->spb,
2581 length-4, ack);
2582 }
2583 #ifdef OHCI1394_DEBUG
2584 else
2585 PRINT (KERN_DEBUG, "Got phy packet ctx=%d ... discarded",
2586 d->ctx);
2587 #endif
2588
2589 rescount = le32_to_cpu(d->prg_cpu[idx]->status) & 0xffff;
2590
2591 bytes_left = d->buf_size - rescount - offset;
2592
2593 }
2594
2595 d->buf_ind = idx;
2596 d->buf_offset = offset;
2597
2598 spin_unlock_irqrestore(&d->lock, flags);
2599 }
2600
2601 /* Bottom half that processes sent packets */
2602 static void dma_trm_tasklet (unsigned long data)
2603 {
2604 struct dma_trm_ctx *d = (struct dma_trm_ctx*)data;
2605 struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
2606 struct hpsb_packet *packet, *ptmp;
2607 unsigned long flags;
2608 u32 status, ack;
2609 size_t datasize;
2610
2611 spin_lock_irqsave(&d->lock, flags);
2612
2613 list_for_each_entry_safe(packet, ptmp, &d->fifo_list, driver_list) {
2614 datasize = packet->data_size;
2615 if (datasize && packet->type != hpsb_raw)
2616 status = le32_to_cpu(
2617 d->prg_cpu[d->sent_ind]->end.status) >> 16;
2618 else
2619 status = le32_to_cpu(
2620 d->prg_cpu[d->sent_ind]->begin.status) >> 16;
2621
2622 if (status == 0)
2623 /* this packet hasn't been sent yet*/
2624 break;
2625
2626 #ifdef OHCI1394_DEBUG
2627 if (datasize)
2628 if (((le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>4)&0xf) == 0xa)
2629 DBGMSG("Stream packet sent to channel %d tcode=0x%X "
2630 "ack=0x%X spd=%d dataLength=%d ctx=%d",
2631 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>8)&0x3f,
2632 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>4)&0xf,
2633 status&0x1f, (status>>5)&0x3,
2634 le32_to_cpu(d->prg_cpu[d->sent_ind]->data[1])>>16,
2635 d->ctx);
2636 else
2637 DBGMSG("Packet sent to node %d tcode=0x%X tLabel="
2638 "%d ack=0x%X spd=%d dataLength=%d ctx=%d",
2639 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[1])>>16)&0x3f,
2640 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>4)&0xf,
2641 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>10)&0x3f,
2642 status&0x1f, (status>>5)&0x3,
2643 le32_to_cpu(d->prg_cpu[d->sent_ind]->data[3])>>16,
2644 d->ctx);
2645 else
2646 DBGMSG("Packet sent to node %d tcode=0x%X tLabel="
2647 "%d ack=0x%X spd=%d data=0x%08X ctx=%d",
2648 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[1])
2649 >>16)&0x3f,
2650 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])
2651 >>4)&0xf,
2652 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])
2653 >>10)&0x3f,
2654 status&0x1f, (status>>5)&0x3,
2655 le32_to_cpu(d->prg_cpu[d->sent_ind]->data[3]),
2656 d->ctx);
2657 #endif
2658
2659 if (status & 0x10) {
2660 ack = status & 0xf;
2661 } else {
2662 switch (status & 0x1f) {
2663 case EVT_NO_STATUS: /* that should never happen */
2664 case EVT_RESERVED_A: /* that should never happen */
2665 case EVT_LONG_PACKET: /* that should never happen */
2666 PRINT(KERN_WARNING, "Received OHCI evt_* error 0x%x", status & 0x1f);
2667 ack = ACKX_SEND_ERROR;
2668 break;
2669 case EVT_MISSING_ACK:
2670 ack = ACKX_TIMEOUT;
2671 break;
2672 case EVT_UNDERRUN:
2673 ack = ACKX_SEND_ERROR;
2674 break;
2675 case EVT_OVERRUN: /* that should never happen */
2676 PRINT(KERN_WARNING, "Received OHCI evt_* error 0x%x", status & 0x1f);
2677 ack = ACKX_SEND_ERROR;
2678 break;
2679 case EVT_DESCRIPTOR_READ:
2680 case EVT_DATA_READ:
2681 case EVT_DATA_WRITE:
2682 ack = ACKX_SEND_ERROR;
2683 break;
2684 case EVT_BUS_RESET: /* that should never happen */
2685 PRINT(KERN_WARNING, "Received OHCI evt_* error 0x%x", status & 0x1f);
2686 ack = ACKX_SEND_ERROR;
2687 break;
2688 case EVT_TIMEOUT:
2689 ack = ACKX_TIMEOUT;
2690 break;
2691 case EVT_TCODE_ERR:
2692 ack = ACKX_SEND_ERROR;
2693 break;
2694 case EVT_RESERVED_B: /* that should never happen */
2695 case EVT_RESERVED_C: /* that should never happen */
2696 PRINT(KERN_WARNING, "Received OHCI evt_* error 0x%x", status & 0x1f);
2697 ack = ACKX_SEND_ERROR;
2698 break;
2699 case EVT_UNKNOWN:
2700 case EVT_FLUSHED:
2701 ack = ACKX_SEND_ERROR;
2702 break;
2703 default:
2704 PRINT(KERN_ERR, "Unhandled OHCI evt_* error 0x%x", status & 0x1f);
2705 ack = ACKX_SEND_ERROR;
2706 BUG();
2707 }
2708 }
2709
2710 list_del_init(&packet->driver_list);
2711 hpsb_packet_sent(ohci->host, packet, ack);
2712
2713 if (datasize)
2714 pci_unmap_single(ohci->dev,
2715 cpu_to_le32(d->prg_cpu[d->sent_ind]->end.address),
2716 datasize, PCI_DMA_TODEVICE);
2717
2718 d->sent_ind = (d->sent_ind+1)%d->num_desc;
2719 d->free_prgs++;
2720 }
2721
2722 dma_trm_flush(ohci, d);
2723
2724 spin_unlock_irqrestore(&d->lock, flags);
2725 }
2726
2727 static void free_dma_rcv_ctx(struct dma_rcv_ctx *d)
2728 {
2729 int i;
2730 struct ti_ohci *ohci = d->ohci;
2731
2732 if (ohci == NULL)
2733 return;
2734
2735 DBGMSG("Freeing dma_rcv_ctx %d", d->ctx);
2736
2737 if (d->buf_cpu) {
2738 for (i=0; i<d->num_desc; i++)
2739 if (d->buf_cpu[i] && d->buf_bus[i])
2740 pci_free_consistent(
2741 ohci->dev, d->buf_size,
2742 d->buf_cpu[i], d->buf_bus[i]);
2743 kfree(d->buf_cpu);
2744 kfree(d->buf_bus);
2745 }
2746 if (d->prg_cpu) {
2747 for (i=0; i<d->num_desc; i++)
2748 if (d->prg_cpu[i] && d->prg_bus[i])
2749 pci_pool_free(d->prg_pool, d->prg_cpu[i],
2750 d->prg_bus[i]);
2751 pci_pool_destroy(d->prg_pool);
2752 kfree(d->prg_cpu);
2753 kfree(d->prg_bus);
2754 }
2755 kfree(d->spb);
2756
2757 /* Mark this context as freed. */
2758 d->ohci = NULL;
2759 }
2760
2761 static int
2762 alloc_dma_rcv_ctx(struct ti_ohci *ohci, struct dma_rcv_ctx *d,
2763 enum context_type type, int ctx, int num_desc,
2764 int buf_size, int split_buf_size, int context_base)
2765 {
2766 int i, len;
2767 static int num_allocs;
2768 static char pool_name[20];
2769
2770 d->ohci = ohci;
2771 d->type = type;
2772 d->ctx = ctx;
2773
2774 d->num_desc = num_desc;
2775 d->buf_size = buf_size;
2776 d->split_buf_size = split_buf_size;
2777
2778 d->ctrlSet = 0;
2779 d->ctrlClear = 0;
2780 d->cmdPtr = 0;
2781
2782 d->buf_cpu = kzalloc(d->num_desc * sizeof(*d->buf_cpu), GFP_ATOMIC);
2783 d->buf_bus = kzalloc(d->num_desc * sizeof(*d->buf_bus), GFP_ATOMIC);
2784
2785 if (d->buf_cpu == NULL || d->buf_bus == NULL) {
2786 PRINT(KERN_ERR, "Failed to allocate dma buffer");
2787 free_dma_rcv_ctx(d);
2788 return -ENOMEM;
2789 }
2790
2791 d->prg_cpu = kzalloc(d->num_desc * sizeof(*d->prg_cpu), GFP_ATOMIC);
2792 d->prg_bus = kzalloc(d->num_desc * sizeof(*d->prg_bus), GFP_ATOMIC);
2793
2794 if (d->prg_cpu == NULL || d->prg_bus == NULL) {
2795 PRINT(KERN_ERR, "Failed to allocate dma prg");
2796 free_dma_rcv_ctx(d);
2797 return -ENOMEM;
2798 }
2799
2800 d->spb = kmalloc(d->split_buf_size, GFP_ATOMIC);
2801
2802 if (d->spb == NULL) {
2803 PRINT(KERN_ERR, "Failed to allocate split buffer");
2804 free_dma_rcv_ctx(d);
2805 return -ENOMEM;
2806 }
2807
2808 len = sprintf(pool_name, "ohci1394_rcv_prg");
2809 sprintf(pool_name+len, "%d", num_allocs);
2810 d->prg_pool = pci_pool_create(pool_name, ohci->dev,
2811 sizeof(struct dma_cmd), 4, 0);
2812 if(d->prg_pool == NULL)
2813 {
2814 PRINT(KERN_ERR, "pci_pool_create failed for %s", pool_name);
2815 free_dma_rcv_ctx(d);
2816 return -ENOMEM;
2817 }
2818 num_allocs++;
2819
2820 for (i=0; i<d->num_desc; i++) {
2821 d->buf_cpu[i] = pci_alloc_consistent(ohci->dev,
2822 d->buf_size,
2823 d->buf_bus+i);
2824
2825 if (d->buf_cpu[i] != NULL) {
2826 memset(d->buf_cpu[i], 0, d->buf_size);
2827 } else {
2828 PRINT(KERN_ERR,
2829 "Failed to allocate dma buffer");
2830 free_dma_rcv_ctx(d);
2831 return -ENOMEM;
2832 }
2833
2834 d->prg_cpu[i] = pci_pool_alloc(d->prg_pool, GFP_KERNEL, d->prg_bus+i);
2835
2836 if (d->prg_cpu[i] != NULL) {
2837 memset(d->prg_cpu[i], 0, sizeof(struct dma_cmd));
2838 } else {
2839 PRINT(KERN_ERR,
2840 "Failed to allocate dma prg");
2841 free_dma_rcv_ctx(d);
2842 return -ENOMEM;
2843 }
2844 }
2845
2846 spin_lock_init(&d->lock);
2847
2848 d->ctrlSet = context_base + OHCI1394_ContextControlSet;
2849 d->ctrlClear = context_base + OHCI1394_ContextControlClear;
2850 d->cmdPtr = context_base + OHCI1394_ContextCommandPtr;
2851
2852 tasklet_init(&d->task, dma_rcv_tasklet, (unsigned long) d);
2853 return 0;
2854 }
2855
2856 static void free_dma_trm_ctx(struct dma_trm_ctx *d)
2857 {
2858 int i;
2859 struct ti_ohci *ohci = d->ohci;
2860
2861 if (ohci == NULL)
2862 return;
2863
2864 DBGMSG("Freeing dma_trm_ctx %d", d->ctx);
2865
2866 if (d->prg_cpu) {
2867 for (i=0; i<d->num_desc; i++)
2868 if (d->prg_cpu[i] && d->prg_bus[i])
2869 pci_pool_free(d->prg_pool, d->prg_cpu[i],
2870 d->prg_bus[i]);
2871 pci_pool_destroy(d->prg_pool);
2872 kfree(d->prg_cpu);
2873 kfree(d->prg_bus);
2874 }
2875
2876 /* Mark this context as freed. */
2877 d->ohci = NULL;
2878 }
2879
2880 static int
2881 alloc_dma_trm_ctx(struct ti_ohci *ohci, struct dma_trm_ctx *d,
2882 enum context_type type, int ctx, int num_desc,
2883 int context_base)
2884 {
2885 int i, len;
2886 static char pool_name[20];
2887 static int num_allocs=0;
2888
2889 d->ohci = ohci;
2890 d->type = type;
2891 d->ctx = ctx;
2892 d->num_desc = num_desc;
2893 d->ctrlSet = 0;
2894 d->ctrlClear = 0;
2895 d->cmdPtr = 0;
2896
2897 d->prg_cpu = kzalloc(d->num_desc * sizeof(*d->prg_cpu), GFP_KERNEL);
2898 d->prg_bus = kzalloc(d->num_desc * sizeof(*d->prg_bus), GFP_KERNEL);
2899
2900 if (d->prg_cpu == NULL || d->prg_bus == NULL) {
2901 PRINT(KERN_ERR, "Failed to allocate at dma prg");
2902 free_dma_trm_ctx(d);
2903 return -ENOMEM;
2904 }
2905
2906 len = sprintf(pool_name, "ohci1394_trm_prg");
2907 sprintf(pool_name+len, "%d", num_allocs);
2908 d->prg_pool = pci_pool_create(pool_name, ohci->dev,
2909 sizeof(struct at_dma_prg), 4, 0);
2910 if (d->prg_pool == NULL) {
2911 PRINT(KERN_ERR, "pci_pool_create failed for %s", pool_name);
2912 free_dma_trm_ctx(d);
2913 return -ENOMEM;
2914 }
2915 num_allocs++;
2916
2917 for (i = 0; i < d->num_desc; i++) {
2918 d->prg_cpu[i] = pci_pool_alloc(d->prg_pool, GFP_KERNEL, d->prg_bus+i);
2919
2920 if (d->prg_cpu[i] != NULL) {
2921 memset(d->prg_cpu[i], 0, sizeof(struct at_dma_prg));
2922 } else {
2923 PRINT(KERN_ERR,
2924 "Failed to allocate at dma prg");
2925 free_dma_trm_ctx(d);
2926 return -ENOMEM;
2927 }
2928 }
2929
2930 spin_lock_init(&d->lock);
2931
2932 /* initialize tasklet */
2933 d->ctrlSet = context_base + OHCI1394_ContextControlSet;
2934 d->ctrlClear = context_base + OHCI1394_ContextControlClear;
2935 d->cmdPtr = context_base + OHCI1394_ContextCommandPtr;
2936 tasklet_init(&d->task, dma_trm_tasklet, (unsigned long)d);
2937 return 0;
2938 }
2939
2940 static void ohci_set_hw_config_rom(struct hpsb_host *host, quadlet_t *config_rom)
2941 {
2942 struct ti_ohci *ohci = host->hostdata;
2943
2944 reg_write(ohci, OHCI1394_ConfigROMhdr, be32_to_cpu(config_rom[0]));
2945 reg_write(ohci, OHCI1394_BusOptions, be32_to_cpu(config_rom[2]));
2946
2947 memcpy(ohci->csr_config_rom_cpu, config_rom, OHCI_CONFIG_ROM_LEN);
2948 }
2949
2950
2951 static quadlet_t ohci_hw_csr_reg(struct hpsb_host *host, int reg,
2952 quadlet_t data, quadlet_t compare)
2953 {
2954 struct ti_ohci *ohci = host->hostdata;
2955 int i;
2956
2957 reg_write(ohci, OHCI1394_CSRData, data);
2958 reg_write(ohci, OHCI1394_CSRCompareData, compare);
2959 reg_write(ohci, OHCI1394_CSRControl, reg & 0x3);
2960
2961 for (i = 0; i < OHCI_LOOP_COUNT; i++) {
2962 if (reg_read(ohci, OHCI1394_CSRControl) & 0x80000000)
2963 break;
2964
2965 mdelay(1);
2966 }
2967
2968 return reg_read(ohci, OHCI1394_CSRData);
2969 }
2970
2971 static struct hpsb_host_driver ohci1394_driver = {
2972 .owner = THIS_MODULE,
2973 .name = OHCI1394_DRIVER_NAME,
2974 .set_hw_config_rom = ohci_set_hw_config_rom,
2975 .transmit_packet = ohci_transmit,
2976 .devctl = ohci_devctl,
2977 .isoctl = ohci_isoctl,
2978 .hw_csr_reg = ohci_hw_csr_reg,
2979 };
2980
2981 /***********************************
2982 * PCI Driver Interface functions *
2983 ***********************************/
2984
2985 #define FAIL(err, fmt, args...) \
2986 do { \
2987 PRINT_G(KERN_ERR, fmt , ## args); \
2988 ohci1394_pci_remove(dev); \
2989 return err; \
2990 } while (0)
2991
2992 static int __devinit ohci1394_pci_probe(struct pci_dev *dev,
2993 const struct pci_device_id *ent)
2994 {
2995 struct hpsb_host *host;
2996 struct ti_ohci *ohci; /* shortcut to currently handled device */
2997 resource_size_t ohci_base;
2998
2999 #ifdef CONFIG_PPC_PMAC
3000 /* Necessary on some machines if ohci1394 was loaded/ unloaded before */
3001 if (machine_is(powermac)) {
3002 struct device_node *ofn = pci_device_to_OF_node(dev);
3003
3004 if (ofn) {
3005 pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, ofn, 0, 1);
3006 pmac_call_feature(PMAC_FTR_1394_ENABLE, ofn, 0, 1);
3007 }
3008 }
3009 #endif /* CONFIG_PPC_PMAC */
3010
3011 if (pci_enable_device(dev))
3012 FAIL(-ENXIO, "Failed to enable OHCI hardware");
3013 pci_set_master(dev);
3014
3015 host = hpsb_alloc_host(&ohci1394_driver, sizeof(struct ti_ohci), &dev->dev);
3016 if (!host) FAIL(-ENOMEM, "Failed to allocate host structure");
3017
3018 ohci = host->hostdata;
3019 ohci->dev = dev;
3020 ohci->host = host;
3021 ohci->init_state = OHCI_INIT_ALLOC_HOST;
3022 host->pdev = dev;
3023 pci_set_drvdata(dev, ohci);
3024
3025 /* We don't want hardware swapping */
3026 pci_write_config_dword(dev, OHCI1394_PCI_HCI_Control, 0);
3027
3028 /* Some oddball Apple controllers do not order the selfid
3029 * properly, so we make up for it here. */
3030 #ifndef __LITTLE_ENDIAN
3031 /* XXX: Need a better way to check this. I'm wondering if we can
3032 * read the values of the OHCI1394_PCI_HCI_Control and the
3033 * noByteSwapData registers to see if they were not cleared to
3034 * zero. Should this work? Obviously it's not defined what these
3035 * registers will read when they aren't supported. Bleh! */
3036 if (dev->vendor == PCI_VENDOR_ID_APPLE &&
3037 dev->device == PCI_DEVICE_ID_APPLE_UNI_N_FW) {
3038 ohci->no_swap_incoming = 1;
3039 ohci->selfid_swap = 0;
3040 } else
3041 ohci->selfid_swap = 1;
3042 #endif
3043
3044
3045 #ifndef PCI_DEVICE_ID_NVIDIA_NFORCE2_FW
3046 #define PCI_DEVICE_ID_NVIDIA_NFORCE2_FW 0x006e
3047 #endif
3048
3049 /* These chipsets require a bit of extra care when checking after
3050 * a busreset. */
3051 if ((dev->vendor == PCI_VENDOR_ID_APPLE &&
3052 dev->device == PCI_DEVICE_ID_APPLE_UNI_N_FW) ||
3053 (dev->vendor == PCI_VENDOR_ID_NVIDIA &&
3054 dev->device == PCI_DEVICE_ID_NVIDIA_NFORCE2_FW))
3055 ohci->check_busreset = 1;
3056
3057 /* We hardwire the MMIO length, since some CardBus adaptors
3058 * fail to report the right length. Anyway, the ohci spec
3059 * clearly says it's 2kb, so this shouldn't be a problem. */
3060 ohci_base = pci_resource_start(dev, 0);
3061 if (pci_resource_len(dev, 0) < OHCI1394_REGISTER_SIZE)
3062 PRINT(KERN_WARNING, "PCI resource length of 0x%llx too small!",
3063 (unsigned long long)pci_resource_len(dev, 0));
3064
3065 if (!request_mem_region(ohci_base, OHCI1394_REGISTER_SIZE,
3066 OHCI1394_DRIVER_NAME))
3067 FAIL(-ENOMEM, "MMIO resource (0x%llx - 0x%llx) unavailable",
3068 (unsigned long long)ohci_base,
3069 (unsigned long long)ohci_base + OHCI1394_REGISTER_SIZE);
3070 ohci->init_state = OHCI_INIT_HAVE_MEM_REGION;
3071
3072 ohci->registers = ioremap(ohci_base, OHCI1394_REGISTER_SIZE);
3073 if (ohci->registers == NULL)
3074 FAIL(-ENXIO, "Failed to remap registers - card not accessible");
3075 ohci->init_state = OHCI_INIT_HAVE_IOMAPPING;
3076 DBGMSG("Remapped memory spaces reg 0x%p", ohci->registers);
3077
3078 /* csr_config rom allocation */
3079 ohci->csr_config_rom_cpu =
3080 pci_alloc_consistent(ohci->dev, OHCI_CONFIG_ROM_LEN,
3081 &ohci->csr_config_rom_bus);
3082 if (ohci->csr_config_rom_cpu == NULL)
3083 FAIL(-ENOMEM, "Failed to allocate buffer config rom");
3084 ohci->init_state = OHCI_INIT_HAVE_CONFIG_ROM_BUFFER;
3085
3086 /* self-id dma buffer allocation */
3087 ohci->selfid_buf_cpu =
3088 pci_alloc_consistent(ohci->dev, OHCI1394_SI_DMA_BUF_SIZE,
3089 &ohci->selfid_buf_bus);
3090 if (ohci->selfid_buf_cpu == NULL)
3091 FAIL(-ENOMEM, "Failed to allocate DMA buffer for self-id packets");
3092 ohci->init_state = OHCI_INIT_HAVE_SELFID_BUFFER;
3093
3094 if ((unsigned long)ohci->selfid_buf_cpu & 0x1fff)
3095 PRINT(KERN_INFO, "SelfID buffer %p is not aligned on "
3096 "8Kb boundary... may cause problems on some CXD3222 chip",
3097 ohci->selfid_buf_cpu);
3098
3099 /* No self-id errors at startup */
3100 ohci->self_id_errors = 0;
3101
3102 ohci->init_state = OHCI_INIT_HAVE_TXRX_BUFFERS__MAYBE;
3103 /* AR DMA request context allocation */
3104 if (alloc_dma_rcv_ctx(ohci, &ohci->ar_req_context,
3105 DMA_CTX_ASYNC_REQ, 0, AR_REQ_NUM_DESC,
3106 AR_REQ_BUF_SIZE, AR_REQ_SPLIT_BUF_SIZE,
3107 OHCI1394_AsReqRcvContextBase) < 0)
3108 FAIL(-ENOMEM, "Failed to allocate AR Req context");
3109
3110 /* AR DMA response context allocation */
3111 if (alloc_dma_rcv_ctx(ohci, &ohci->ar_resp_context,
3112 DMA_CTX_ASYNC_RESP, 0, AR_RESP_NUM_DESC,
3113 AR_RESP_BUF_SIZE, AR_RESP_SPLIT_BUF_SIZE,
3114 OHCI1394_AsRspRcvContextBase) < 0)
3115 FAIL(-ENOMEM, "Failed to allocate AR Resp context");
3116
3117 /* AT DMA request context */
3118 if (alloc_dma_trm_ctx(ohci, &ohci->at_req_context,
3119 DMA_CTX_ASYNC_REQ, 0, AT_REQ_NUM_DESC,
3120 OHCI1394_AsReqTrContextBase) < 0)
3121 FAIL(-ENOMEM, "Failed to allocate AT Req context");
3122
3123 /* AT DMA response context */
3124 if (alloc_dma_trm_ctx(ohci, &ohci->at_resp_context,
3125 DMA_CTX_ASYNC_RESP, 1, AT_RESP_NUM_DESC,
3126 OHCI1394_AsRspTrContextBase) < 0)
3127 FAIL(-ENOMEM, "Failed to allocate AT Resp context");
3128
3129 /* Start off with a soft reset, to clear everything to a sane
3130 * state. */
3131 ohci_soft_reset(ohci);
3132
3133 /* Now enable LPS, which we need in order to start accessing
3134 * most of the registers. In fact, on some cards (ALI M5251),
3135 * accessing registers in the SClk domain without LPS enabled
3136 * will lock up the machine. Wait 50msec to make sure we have
3137 * full link enabled. */
3138 reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_LPS);
3139
3140 /* Disable and clear interrupts */
3141 reg_write(ohci, OHCI1394_IntEventClear, 0xffffffff);
3142 reg_write(ohci, OHCI1394_IntMaskClear, 0xffffffff);
3143
3144 mdelay(50);
3145
3146 /* Determine the number of available IR and IT contexts. */
3147 ohci->nb_iso_rcv_ctx =
3148 get_nb_iso_ctx(ohci, OHCI1394_IsoRecvIntMaskSet);
3149 ohci->nb_iso_xmit_ctx =
3150 get_nb_iso_ctx(ohci, OHCI1394_IsoXmitIntMaskSet);
3151
3152 /* Set the usage bits for non-existent contexts so they can't
3153 * be allocated */
3154 ohci->ir_ctx_usage = ~0 << ohci->nb_iso_rcv_ctx;
3155 ohci->it_ctx_usage = ~0 << ohci->nb_iso_xmit_ctx;
3156
3157 INIT_LIST_HEAD(&ohci->iso_tasklet_list);
3158 spin_lock_init(&ohci->iso_tasklet_list_lock);
3159 ohci->ISO_channel_usage = 0;
3160 spin_lock_init(&ohci->IR_channel_lock);
3161
3162 spin_lock_init(&ohci->event_lock);
3163
3164 /*
3165 * interrupts are disabled, all right, but... due to IRQF_SHARED we
3166 * might get called anyway. We'll see no event, of course, but
3167 * we need to get to that "no event", so enough should be initialized
3168 * by that point.
3169 */
3170 if (request_irq(dev->irq, ohci_irq_handler, IRQF_SHARED,
3171 OHCI1394_DRIVER_NAME, ohci))
3172 FAIL(-ENOMEM, "Failed to allocate shared interrupt %d", dev->irq);
3173
3174 ohci->init_state = OHCI_INIT_HAVE_IRQ;
3175 ohci_initialize(ohci);
3176
3177 /* Set certain csr values */
3178 host->csr.guid_hi = reg_read(ohci, OHCI1394_GUIDHi);
3179 host->csr.guid_lo = reg_read(ohci, OHCI1394_GUIDLo);
3180 host->csr.cyc_clk_acc = 100; /* how do we determine clk accuracy? */
3181 host->csr.max_rec = (reg_read(ohci, OHCI1394_BusOptions) >> 12) & 0xf;
3182 host->csr.lnk_spd = reg_read(ohci, OHCI1394_BusOptions) & 0x7;
3183
3184 if (phys_dma) {
3185 host->low_addr_space =
3186 (u64) reg_read(ohci, OHCI1394_PhyUpperBound) << 16;
3187 if (!host->low_addr_space)
3188 host->low_addr_space = OHCI1394_PHYS_UPPER_BOUND_FIXED;
3189 }
3190 host->middle_addr_space = OHCI1394_MIDDLE_ADDRESS_SPACE;
3191
3192 /* Tell the highlevel this host is ready */
3193 if (hpsb_add_host(host))
3194 FAIL(-ENOMEM, "Failed to register host with highlevel");
3195
3196 ohci->init_state = OHCI_INIT_DONE;
3197
3198 return 0;
3199 #undef FAIL
3200 }
3201
3202 static void ohci1394_pci_remove(struct pci_dev *pdev)
3203 {
3204 struct ti_ohci *ohci;
3205 struct device *dev;
3206
3207 ohci = pci_get_drvdata(pdev);
3208 if (!ohci)
3209 return;
3210
3211 dev = get_device(&ohci->host->device);
3212
3213 switch (ohci->init_state) {
3214 case OHCI_INIT_DONE:
3215 hpsb_remove_host(ohci->host);
3216
3217 /* Clear out BUS Options */
3218 reg_write(ohci, OHCI1394_ConfigROMhdr, 0);
3219 reg_write(ohci, OHCI1394_BusOptions,
3220 (reg_read(ohci, OHCI1394_BusOptions) & 0x0000f007) |
3221 0x00ff0000);
3222 memset(ohci->csr_config_rom_cpu, 0, OHCI_CONFIG_ROM_LEN);
3223
3224 case OHCI_INIT_HAVE_IRQ:
3225 /* Clear interrupt registers */
3226 reg_write(ohci, OHCI1394_IntMaskClear, 0xffffffff);
3227 reg_write(ohci, OHCI1394_IntEventClear, 0xffffffff);
3228 reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, 0xffffffff);
3229 reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 0xffffffff);
3230 reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, 0xffffffff);
3231 reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 0xffffffff);
3232
3233 /* Disable IRM Contender */
3234 set_phy_reg(ohci, 4, ~0xc0 & get_phy_reg(ohci, 4));
3235
3236 /* Clear link control register */
3237 reg_write(ohci, OHCI1394_LinkControlClear, 0xffffffff);
3238
3239 /* Let all other nodes know to ignore us */
3240 ohci_devctl(ohci->host, RESET_BUS, LONG_RESET_NO_FORCE_ROOT);
3241
3242 /* Soft reset before we start - this disables
3243 * interrupts and clears linkEnable and LPS. */
3244 ohci_soft_reset(ohci);
3245 free_irq(ohci->dev->irq, ohci);
3246
3247 case OHCI_INIT_HAVE_TXRX_BUFFERS__MAYBE:
3248 /* The ohci_soft_reset() stops all DMA contexts, so we
3249 * dont need to do this. */
3250 free_dma_rcv_ctx(&ohci->ar_req_context);
3251 free_dma_rcv_ctx(&ohci->ar_resp_context);
3252 free_dma_trm_ctx(&ohci->at_req_context);
3253 free_dma_trm_ctx(&ohci->at_resp_context);
3254
3255 case OHCI_INIT_HAVE_SELFID_BUFFER:
3256 pci_free_consistent(ohci->dev, OHCI1394_SI_DMA_BUF_SIZE,
3257 ohci->selfid_buf_cpu,
3258 ohci->selfid_buf_bus);
3259
3260 case OHCI_INIT_HAVE_CONFIG_ROM_BUFFER:
3261 pci_free_consistent(ohci->dev, OHCI_CONFIG_ROM_LEN,
3262 ohci->csr_config_rom_cpu,
3263 ohci->csr_config_rom_bus);
3264
3265 case OHCI_INIT_HAVE_IOMAPPING:
3266 iounmap(ohci->registers);
3267
3268 case OHCI_INIT_HAVE_MEM_REGION:
3269 release_mem_region(pci_resource_start(ohci->dev, 0),
3270 OHCI1394_REGISTER_SIZE);
3271
3272 #ifdef CONFIG_PPC_PMAC
3273 /* On UniNorth, power down the cable and turn off the chip clock
3274 * to save power on laptops */
3275 if (machine_is(powermac)) {
3276 struct device_node* ofn = pci_device_to_OF_node(ohci->dev);
3277
3278 if (ofn) {
3279 pmac_call_feature(PMAC_FTR_1394_ENABLE, ofn, 0, 0);
3280 pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, ofn, 0, 0);
3281 }
3282 }
3283 #endif /* CONFIG_PPC_PMAC */
3284
3285 case OHCI_INIT_ALLOC_HOST:
3286 pci_set_drvdata(ohci->dev, NULL);
3287 }
3288
3289 if (dev)
3290 put_device(dev);
3291 }
3292
3293 #ifdef CONFIG_PM
3294 static int ohci1394_pci_suspend(struct pci_dev *pdev, pm_message_t state)
3295 {
3296 int err;
3297 struct ti_ohci *ohci = pci_get_drvdata(pdev);
3298
3299 if (!ohci) {
3300 printk(KERN_ERR "%s: tried to suspend nonexisting host\n",
3301 OHCI1394_DRIVER_NAME);
3302 return -ENXIO;
3303 }
3304 DBGMSG("suspend called");
3305
3306 /* Clear the async DMA contexts and stop using the controller */
3307 hpsb_bus_reset(ohci->host);
3308
3309 /* See ohci1394_pci_remove() for comments on this sequence */
3310 reg_write(ohci, OHCI1394_ConfigROMhdr, 0);
3311 reg_write(ohci, OHCI1394_BusOptions,
3312 (reg_read(ohci, OHCI1394_BusOptions) & 0x0000f007) |
3313 0x00ff0000);
3314 reg_write(ohci, OHCI1394_IntMaskClear, 0xffffffff);
3315 reg_write(ohci, OHCI1394_IntEventClear, 0xffffffff);
3316 reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, 0xffffffff);
3317 reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 0xffffffff);
3318 reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, 0xffffffff);
3319 reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 0xffffffff);
3320 set_phy_reg(ohci, 4, ~0xc0 & get_phy_reg(ohci, 4));
3321 reg_write(ohci, OHCI1394_LinkControlClear, 0xffffffff);
3322 ohci_devctl(ohci->host, RESET_BUS, LONG_RESET_NO_FORCE_ROOT);
3323 ohci_soft_reset(ohci);
3324
3325 err = pci_save_state(pdev);
3326 if (err) {
3327 PRINT(KERN_ERR, "pci_save_state failed with %d", err);
3328 return err;
3329 }
3330 err = pci_set_power_state(pdev, pci_choose_state(pdev, state));
3331 if (err)
3332 DBGMSG("pci_set_power_state failed with %d", err);
3333
3334 /* PowerMac suspend code comes last */
3335 #ifdef CONFIG_PPC_PMAC
3336 if (machine_is(powermac)) {
3337 struct device_node *ofn = pci_device_to_OF_node(pdev);
3338
3339 if (ofn)
3340 pmac_call_feature(PMAC_FTR_1394_ENABLE, ofn, 0, 0);
3341 }
3342 #endif /* CONFIG_PPC_PMAC */
3343
3344 return 0;
3345 }
3346
3347 static int ohci1394_pci_resume(struct pci_dev *pdev)
3348 {
3349 int err;
3350 struct ti_ohci *ohci = pci_get_drvdata(pdev);
3351
3352 if (!ohci) {
3353 printk(KERN_ERR "%s: tried to resume nonexisting host\n",
3354 OHCI1394_DRIVER_NAME);
3355 return -ENXIO;
3356 }
3357 DBGMSG("resume called");
3358
3359 /* PowerMac resume code comes first */
3360 #ifdef CONFIG_PPC_PMAC
3361 if (machine_is(powermac)) {
3362 struct device_node *ofn = pci_device_to_OF_node(pdev);
3363
3364 if (ofn)
3365 pmac_call_feature(PMAC_FTR_1394_ENABLE, ofn, 0, 1);
3366 }
3367 #endif /* CONFIG_PPC_PMAC */
3368
3369 pci_set_power_state(pdev, PCI_D0);
3370 pci_restore_state(pdev);
3371 err = pci_enable_device(pdev);
3372 if (err) {
3373 PRINT(KERN_ERR, "pci_enable_device failed with %d", err);
3374 return err;
3375 }
3376
3377 /* See ohci1394_pci_probe() for comments on this sequence */
3378 ohci_soft_reset(ohci);
3379 reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_LPS);
3380 reg_write(ohci, OHCI1394_IntEventClear, 0xffffffff);
3381 reg_write(ohci, OHCI1394_IntMaskClear, 0xffffffff);
3382 mdelay(50);
3383 ohci_initialize(ohci);
3384
3385 hpsb_resume_host(ohci->host);
3386 return 0;
3387 }
3388 #endif /* CONFIG_PM */
3389
3390 static struct pci_device_id ohci1394_pci_tbl[] = {
3391 {
3392 .class = PCI_CLASS_SERIAL_FIREWIRE_OHCI,
3393 .class_mask = PCI_ANY_ID,
3394 .vendor = PCI_ANY_ID,
3395 .device = PCI_ANY_ID,
3396 .subvendor = PCI_ANY_ID,
3397 .subdevice = PCI_ANY_ID,
3398 },
3399 { 0, },
3400 };
3401
3402 MODULE_DEVICE_TABLE(pci, ohci1394_pci_tbl);
3403
3404 static struct pci_driver ohci1394_pci_driver = {
3405 .name = OHCI1394_DRIVER_NAME,
3406 .id_table = ohci1394_pci_tbl,
3407 .probe = ohci1394_pci_probe,
3408 .remove = ohci1394_pci_remove,
3409 #ifdef CONFIG_PM
3410 .resume = ohci1394_pci_resume,
3411 .suspend = ohci1394_pci_suspend,
3412 #endif
3413 };
3414
3415 /***********************************
3416 * OHCI1394 Video Interface *
3417 ***********************************/
3418
3419 /* essentially the only purpose of this code is to allow another
3420 module to hook into ohci's interrupt handler */
3421
3422 /* returns zero if successful, one if DMA context is locked up */
3423 int ohci1394_stop_context(struct ti_ohci *ohci, int reg, char *msg)
3424 {
3425 int i=0;
3426
3427 /* stop the channel program if it's still running */
3428 reg_write(ohci, reg, 0x8000);
3429
3430 /* Wait until it effectively stops */
3431 while (reg_read(ohci, reg) & 0x400) {
3432 i++;
3433 if (i>5000) {
3434 PRINT(KERN_ERR,
3435 "Runaway loop while stopping context: %s...", msg ? msg : "");
3436 return 1;
3437 }
3438
3439 mb();
3440 udelay(10);
3441 }
3442 if (msg) PRINT(KERN_ERR, "%s: dma prg stopped", msg);
3443 return 0;
3444 }
3445
3446 void ohci1394_init_iso_tasklet(struct ohci1394_iso_tasklet *tasklet, int type,
3447 void (*func)(unsigned long), unsigned long data)
3448 {
3449 tasklet_init(&tasklet->tasklet, func, data);
3450 tasklet->type = type;
3451 /* We init the tasklet->link field, so we can list_del() it
3452 * without worrying whether it was added to the list or not. */
3453 INIT_LIST_HEAD(&tasklet->link);
3454 }
3455
3456 int ohci1394_register_iso_tasklet(struct ti_ohci *ohci,
3457 struct ohci1394_iso_tasklet *tasklet)
3458 {
3459 unsigned long flags, *usage;
3460 int n, i, r = -EBUSY;
3461
3462 if (tasklet->type == OHCI_ISO_TRANSMIT) {
3463 n = ohci->nb_iso_xmit_ctx;
3464 usage = &ohci->it_ctx_usage;
3465 }
3466 else {
3467 n = ohci->nb_iso_rcv_ctx;
3468 usage = &ohci->ir_ctx_usage;
3469
3470 /* only one receive context can be multichannel (OHCI sec 10.4.1) */
3471 if (tasklet->type == OHCI_ISO_MULTICHANNEL_RECEIVE) {
3472 if (test_and_set_bit(0, &ohci->ir_multichannel_used)) {
3473 return r;
3474 }
3475 }
3476 }
3477
3478 spin_lock_irqsave(&ohci->iso_tasklet_list_lock, flags);
3479
3480 for (i = 0; i < n; i++)
3481 if (!test_and_set_bit(i, usage)) {
3482 tasklet->context = i;
3483 list_add_tail(&tasklet->link, &ohci->iso_tasklet_list);
3484 r = 0;
3485 break;
3486 }
3487
3488 spin_unlock_irqrestore(&ohci->iso_tasklet_list_lock, flags);
3489
3490 return r;
3491 }
3492
3493 void ohci1394_unregister_iso_tasklet(struct ti_ohci *ohci,
3494 struct ohci1394_iso_tasklet *tasklet)
3495 {
3496 unsigned long flags;
3497
3498 tasklet_kill(&tasklet->tasklet);
3499
3500 spin_lock_irqsave(&ohci->iso_tasklet_list_lock, flags);
3501
3502 if (tasklet->type == OHCI_ISO_TRANSMIT)
3503 clear_bit(tasklet->context, &ohci->it_ctx_usage);
3504 else {
3505 clear_bit(tasklet->context, &ohci->ir_ctx_usage);
3506
3507 if (tasklet->type == OHCI_ISO_MULTICHANNEL_RECEIVE) {
3508 clear_bit(0, &ohci->ir_multichannel_used);
3509 }
3510 }
3511
3512 list_del(&tasklet->link);
3513
3514 spin_unlock_irqrestore(&ohci->iso_tasklet_list_lock, flags);
3515 }
3516
3517 EXPORT_SYMBOL(ohci1394_stop_context);
3518 EXPORT_SYMBOL(ohci1394_init_iso_tasklet);
3519 EXPORT_SYMBOL(ohci1394_register_iso_tasklet);
3520 EXPORT_SYMBOL(ohci1394_unregister_iso_tasklet);
3521
3522 /***********************************
3523 * General module initialization *
3524 ***********************************/
3525
3526 MODULE_AUTHOR("Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>");
3527 MODULE_DESCRIPTION("Driver for PCI OHCI IEEE-1394 controllers");
3528 MODULE_LICENSE("GPL");
3529
3530 static void __exit ohci1394_cleanup (void)
3531 {
3532 pci_unregister_driver(&ohci1394_pci_driver);
3533 }
3534
3535 static int __init ohci1394_init(void)
3536 {
3537 return pci_register_driver(&ohci1394_pci_driver);
3538 }
3539
3540 /* Register before most other device drivers.
3541 * Useful for remote debugging via physical DMA, e.g. using firescope. */
3542 fs_initcall(ohci1394_init);
3543 module_exit(ohci1394_cleanup);
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