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merge sock_alloc_fd/sock_attach_fd into a new helper
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / ieee1394 / ohci1394.c
blobd0dc1db80b295adc31ad88eb38bb82a3106f6175
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/bitops.h>
86 #include <linux/kernel.h>
87 #include <linux/list.h>
88 #include <linux/slab.h>
89 #include <linux/interrupt.h>
90 #include <linux/wait.h>
91 #include <linux/errno.h>
92 #include <linux/module.h>
93 #include <linux/moduleparam.h>
94 #include <linux/pci.h>
95 #include <linux/fs.h>
96 #include <linux/poll.h>
97 #include <asm/byteorder.h>
98 #include <asm/atomic.h>
99 #include <asm/uaccess.h>
100 #include <linux/delay.h>
101 #include <linux/spinlock.h>
102
103 #include <asm/pgtable.h>
104 #include <asm/page.h>
105 #include <asm/irq.h>
106 #include <linux/types.h>
107 #include <linux/vmalloc.h>
108 #include <linux/init.h>
109
110 #ifdef CONFIG_PPC_PMAC
111 #include <asm/machdep.h>
112 #include <asm/pmac_feature.h>
113 #include <asm/prom.h>
114 #include <asm/pci-bridge.h>
115 #endif
116
117 #include "csr1212.h"
118 #include "ieee1394.h"
119 #include "ieee1394_types.h"
120 #include "hosts.h"
121 #include "dma.h"
122 #include "iso.h"
123 #include "ieee1394_core.h"
124 #include "highlevel.h"
125 #include "ohci1394.h"
126
127 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
128 #define OHCI1394_DEBUG
129 #endif
130
131 #ifdef DBGMSG
132 #undef DBGMSG
133 #endif
134
135 #ifdef OHCI1394_DEBUG
136 #define DBGMSG(fmt, args...) \
137 printk(KERN_INFO "%s: fw-host%d: " fmt "\n" , OHCI1394_DRIVER_NAME, ohci->host->id , ## args)
138 #else
139 #define DBGMSG(fmt, args...) do {} while (0)
140 #endif
141
142 /* print general (card independent) information */
143 #define PRINT_G(level, fmt, args...) \
144 printk(level "%s: " fmt "\n" , OHCI1394_DRIVER_NAME , ## args)
145
146 /* print card specific information */
147 #define PRINT(level, fmt, args...) \
148 printk(level "%s: fw-host%d: " fmt "\n" , OHCI1394_DRIVER_NAME, ohci->host->id , ## args)
149
150 /* Module Parameters */
151 static int phys_dma = 1;
152 module_param(phys_dma, int, 0444);
153 MODULE_PARM_DESC(phys_dma, "Enable physical DMA (default = 1).");
154
155 static void dma_trm_tasklet(unsigned long data);
156 static void dma_trm_reset(struct dma_trm_ctx *d);
157
158 static int alloc_dma_rcv_ctx(struct ti_ohci *ohci, struct dma_rcv_ctx *d,
159 enum context_type type, int ctx, int num_desc,
160 int buf_size, int split_buf_size, int context_base);
161 static void free_dma_rcv_ctx(struct dma_rcv_ctx *d);
162
163 static int alloc_dma_trm_ctx(struct ti_ohci *ohci, struct dma_trm_ctx *d,
164 enum context_type type, int ctx, int num_desc,
165 int context_base);
166
167 static void ohci1394_pci_remove(struct pci_dev *pdev);
168
169 #ifndef __LITTLE_ENDIAN
170 static const size_t hdr_sizes[] = {
171 3, /* TCODE_WRITEQ */
172 4, /* TCODE_WRITEB */
173 3, /* TCODE_WRITE_RESPONSE */
174 0, /* reserved */
175 3, /* TCODE_READQ */
176 4, /* TCODE_READB */
177 3, /* TCODE_READQ_RESPONSE */
178 4, /* TCODE_READB_RESPONSE */
179 1, /* TCODE_CYCLE_START */
180 4, /* TCODE_LOCK_REQUEST */
181 2, /* TCODE_ISO_DATA */
182 4, /* TCODE_LOCK_RESPONSE */
183 /* rest is reserved or link-internal */
184 };
185
186 static inline void header_le32_to_cpu(quadlet_t *data, unsigned char tcode)
187 {
188 size_t size;
189
190 if (unlikely(tcode >= ARRAY_SIZE(hdr_sizes)))
191 return;
192
193 size = hdr_sizes[tcode];
194 while (size--)
195 data[size] = le32_to_cpu(data[size]);
196 }
197 #else
198 #define header_le32_to_cpu(w,x) do {} while (0)
199 #endif /* !LITTLE_ENDIAN */
200
201 /***********************************
202 * IEEE-1394 functionality section *
203 ***********************************/
204
205 static u8 get_phy_reg(struct ti_ohci *ohci, u8 addr)
206 {
207 int i;
208 unsigned long flags;
209 quadlet_t r;
210
211 spin_lock_irqsave (&ohci->phy_reg_lock, flags);
212
213 reg_write(ohci, OHCI1394_PhyControl, (addr << 8) | 0x00008000);
214
215 for (i = 0; i < OHCI_LOOP_COUNT; i++) {
216 if (reg_read(ohci, OHCI1394_PhyControl) & 0x80000000)
217 break;
218
219 mdelay(1);
220 }
221
222 r = reg_read(ohci, OHCI1394_PhyControl);
223
224 if (i >= OHCI_LOOP_COUNT)
225 PRINT (KERN_ERR, "Get PHY Reg timeout [0x%08x/0x%08x/%d]",
226 r, r & 0x80000000, i);
227
228 spin_unlock_irqrestore (&ohci->phy_reg_lock, flags);
229
230 return (r & 0x00ff0000) >> 16;
231 }
232
233 static void set_phy_reg(struct ti_ohci *ohci, u8 addr, u8 data)
234 {
235 int i;
236 unsigned long flags;
237 u32 r = 0;
238
239 spin_lock_irqsave (&ohci->phy_reg_lock, flags);
240
241 reg_write(ohci, OHCI1394_PhyControl, (addr << 8) | data | 0x00004000);
242
243 for (i = 0; i < OHCI_LOOP_COUNT; i++) {
244 r = reg_read(ohci, OHCI1394_PhyControl);
245 if (!(r & 0x00004000))
246 break;
247
248 mdelay(1);
249 }
250
251 if (i == OHCI_LOOP_COUNT)
252 PRINT (KERN_ERR, "Set PHY Reg timeout [0x%08x/0x%08x/%d]",
253 r, r & 0x00004000, i);
254
255 spin_unlock_irqrestore (&ohci->phy_reg_lock, flags);
256
257 return;
258 }
259
260 /* Or's our value into the current value */
261 static void set_phy_reg_mask(struct ti_ohci *ohci, u8 addr, u8 data)
262 {
263 u8 old;
264
265 old = get_phy_reg (ohci, addr);
266 old |= data;
267 set_phy_reg (ohci, addr, old);
268
269 return;
270 }
271
272 static void handle_selfid(struct ti_ohci *ohci, struct hpsb_host *host,
273 int phyid, int isroot)
274 {
275 quadlet_t *q = ohci->selfid_buf_cpu;
276 quadlet_t self_id_count=reg_read(ohci, OHCI1394_SelfIDCount);
277 size_t size;
278 quadlet_t q0, q1;
279
280 /* Check status of self-id reception */
281
282 if (ohci->selfid_swap)
283 q0 = le32_to_cpu(q[0]);
284 else
285 q0 = q[0];
286
287 if ((self_id_count & 0x80000000) ||
288 ((self_id_count & 0x00FF0000) != (q0 & 0x00FF0000))) {
289 PRINT(KERN_ERR,
290 "Error in reception of SelfID packets [0x%08x/0x%08x] (count: %d)",
291 self_id_count, q0, ohci->self_id_errors);
292
293 /* Tip by James Goodwin <jamesg@Filanet.com>:
294 * We had an error, generate another bus reset in response. */
295 if (ohci->self_id_errors<OHCI1394_MAX_SELF_ID_ERRORS) {
296 set_phy_reg_mask (ohci, 1, 0x40);
297 ohci->self_id_errors++;
298 } else {
299 PRINT(KERN_ERR,
300 "Too many errors on SelfID error reception, giving up!");
301 }
302 return;
303 }
304
305 /* SelfID Ok, reset error counter. */
306 ohci->self_id_errors = 0;
307
308 size = ((self_id_count & 0x00001FFC) >> 2) - 1;
309 q++;
310
311 while (size > 0) {
312 if (ohci->selfid_swap) {
313 q0 = le32_to_cpu(q[0]);
314 q1 = le32_to_cpu(q[1]);
315 } else {
316 q0 = q[0];
317 q1 = q[1];
318 }
319
320 if (q0 == ~q1) {
321 DBGMSG ("SelfID packet 0x%x received", q0);
322 hpsb_selfid_received(host, cpu_to_be32(q0));
323 if (((q0 & 0x3f000000) >> 24) == phyid)
324 DBGMSG ("SelfID for this node is 0x%08x", q0);
325 } else {
326 PRINT(KERN_ERR,
327 "SelfID is inconsistent [0x%08x/0x%08x]", q0, q1);
328 }
329 q += 2;
330 size -= 2;
331 }
332
333 DBGMSG("SelfID complete");
334
335 return;
336 }
337
338 static void ohci_soft_reset(struct ti_ohci *ohci) {
339 int i;
340
341 reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_softReset);
342
343 for (i = 0; i < OHCI_LOOP_COUNT; i++) {
344 if (!(reg_read(ohci, OHCI1394_HCControlSet) & OHCI1394_HCControl_softReset))
345 break;
346 mdelay(1);
347 }
348 DBGMSG ("Soft reset finished");
349 }
350
351
352 /* Generate the dma receive prgs and start the context */
353 static void initialize_dma_rcv_ctx(struct dma_rcv_ctx *d, int generate_irq)
354 {
355 struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
356 int i;
357
358 ohci1394_stop_context(ohci, d->ctrlClear, NULL);
359
360 for (i=0; i<d->num_desc; i++) {
361 u32 c;
362
363 c = DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE | DMA_CTL_BRANCH;
364 if (generate_irq)
365 c |= DMA_CTL_IRQ;
366
367 d->prg_cpu[i]->control = cpu_to_le32(c | d->buf_size);
368
369 /* End of descriptor list? */
370 if (i + 1 < d->num_desc) {
371 d->prg_cpu[i]->branchAddress =
372 cpu_to_le32((d->prg_bus[i+1] & 0xfffffff0) | 0x1);
373 } else {
374 d->prg_cpu[i]->branchAddress =
375 cpu_to_le32((d->prg_bus[0] & 0xfffffff0));
376 }
377
378 d->prg_cpu[i]->address = cpu_to_le32(d->buf_bus[i]);
379 d->prg_cpu[i]->status = cpu_to_le32(d->buf_size);
380 }
381
382 d->buf_ind = 0;
383 d->buf_offset = 0;
384
385 if (d->type == DMA_CTX_ISO) {
386 /* Clear contextControl */
387 reg_write(ohci, d->ctrlClear, 0xffffffff);
388
389 /* Set bufferFill, isochHeader, multichannel for IR context */
390 reg_write(ohci, d->ctrlSet, 0xd0000000);
391
392 /* Set the context match register to match on all tags */
393 reg_write(ohci, d->ctxtMatch, 0xf0000000);
394
395 /* Clear the multi channel mask high and low registers */
396 reg_write(ohci, OHCI1394_IRMultiChanMaskHiClear, 0xffffffff);
397 reg_write(ohci, OHCI1394_IRMultiChanMaskLoClear, 0xffffffff);
398
399 /* Set up isoRecvIntMask to generate interrupts */
400 reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1 << d->ctx);
401 }
402
403 /* Tell the controller where the first AR program is */
404 reg_write(ohci, d->cmdPtr, d->prg_bus[0] | 0x1);
405
406 /* Run context */
407 reg_write(ohci, d->ctrlSet, 0x00008000);
408
409 DBGMSG("Receive DMA ctx=%d initialized", d->ctx);
410 }
411
412 /* Initialize the dma transmit context */
413 static void initialize_dma_trm_ctx(struct dma_trm_ctx *d)
414 {
415 struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
416
417 /* Stop the context */
418 ohci1394_stop_context(ohci, d->ctrlClear, NULL);
419
420 d->prg_ind = 0;
421 d->sent_ind = 0;
422 d->free_prgs = d->num_desc;
423 d->branchAddrPtr = NULL;
424 INIT_LIST_HEAD(&d->fifo_list);
425 INIT_LIST_HEAD(&d->pending_list);
426
427 if (d->type == DMA_CTX_ISO) {
428 /* enable interrupts */
429 reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1 << d->ctx);
430 }
431
432 DBGMSG("Transmit DMA ctx=%d initialized", d->ctx);
433 }
434
435 /* Count the number of available iso contexts */
436 static int get_nb_iso_ctx(struct ti_ohci *ohci, int reg)
437 {
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 return hweight32(tmp);
447 }
448
449 /* Global initialization */
450 static void ohci_initialize(struct ti_ohci *ohci)
451 {
452 quadlet_t buf;
453 int num_ports, i;
454
455 spin_lock_init(&ohci->phy_reg_lock);
456
457 /* Put some defaults to these undefined bus options */
458 buf = reg_read(ohci, OHCI1394_BusOptions);
459 buf |= 0x60000000; /* Enable CMC and ISC */
460 if (hpsb_disable_irm)
461 buf &= ~0x80000000;
462 else
463 buf |= 0x80000000; /* Enable IRMC */
464 buf &= ~0x00ff0000; /* XXX: Set cyc_clk_acc to zero for now */
465 buf &= ~0x18000000; /* Disable PMC and BMC */
466 reg_write(ohci, OHCI1394_BusOptions, buf);
467
468 /* Set the bus number */
469 reg_write(ohci, OHCI1394_NodeID, 0x0000ffc0);
470
471 /* Enable posted writes */
472 reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_postedWriteEnable);
473
474 /* Clear link control register */
475 reg_write(ohci, OHCI1394_LinkControlClear, 0xffffffff);
476
477 /* Enable cycle timer and cycle master and set the IRM
478 * contender bit in our self ID packets if appropriate. */
479 reg_write(ohci, OHCI1394_LinkControlSet,
480 OHCI1394_LinkControl_CycleTimerEnable |
481 OHCI1394_LinkControl_CycleMaster);
482 i = get_phy_reg(ohci, 4) | PHY_04_LCTRL;
483 if (hpsb_disable_irm)
484 i &= ~PHY_04_CONTENDER;
485 else
486 i |= PHY_04_CONTENDER;
487 set_phy_reg(ohci, 4, i);
488
489 /* Set up self-id dma buffer */
490 reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->selfid_buf_bus);
491
492 /* enable self-id */
493 reg_write(ohci, OHCI1394_LinkControlSet, OHCI1394_LinkControl_RcvSelfID);
494
495 /* Set the Config ROM mapping register */
496 reg_write(ohci, OHCI1394_ConfigROMmap, ohci->csr_config_rom_bus);
497
498 /* Now get our max packet size */
499 ohci->max_packet_size =
500 1<<(((reg_read(ohci, OHCI1394_BusOptions)>>12)&0xf)+1);
501
502 /* Clear the interrupt mask */
503 reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, 0xffffffff);
504 reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 0xffffffff);
505
506 /* Clear the interrupt mask */
507 reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, 0xffffffff);
508 reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 0xffffffff);
509
510 /* Initialize AR dma */
511 initialize_dma_rcv_ctx(&ohci->ar_req_context, 0);
512 initialize_dma_rcv_ctx(&ohci->ar_resp_context, 0);
513
514 /* Initialize AT dma */
515 initialize_dma_trm_ctx(&ohci->at_req_context);
516 initialize_dma_trm_ctx(&ohci->at_resp_context);
517
518 /* Accept AR requests from all nodes */
519 reg_write(ohci, OHCI1394_AsReqFilterHiSet, 0x80000000);
520
521 /* Set the address range of the physical response unit.
522 * Most controllers do not implement it as a writable register though.
523 * They will keep a hardwired offset of 0x00010000 and show 0x0 as
524 * register content.
525 * To actually enable physical responses is the job of our interrupt
526 * handler which programs the physical request filter. */
527 reg_write(ohci, OHCI1394_PhyUpperBound,
528 OHCI1394_PHYS_UPPER_BOUND_PROGRAMMED >> 16);
529
530 DBGMSG("physUpperBoundOffset=%08x",
531 reg_read(ohci, OHCI1394_PhyUpperBound));
532
533 /* Specify AT retries */
534 reg_write(ohci, OHCI1394_ATRetries,
535 OHCI1394_MAX_AT_REQ_RETRIES |
536 (OHCI1394_MAX_AT_RESP_RETRIES<<4) |
537 (OHCI1394_MAX_PHYS_RESP_RETRIES<<8));
538
539 /* We don't want hardware swapping */
540 reg_write(ohci, OHCI1394_HCControlClear, OHCI1394_HCControl_noByteSwap);
541
542 /* Enable interrupts */
543 reg_write(ohci, OHCI1394_IntMaskSet,
544 OHCI1394_unrecoverableError |
545 OHCI1394_masterIntEnable |
546 OHCI1394_busReset |
547 OHCI1394_selfIDComplete |
548 OHCI1394_RSPkt |
549 OHCI1394_RQPkt |
550 OHCI1394_respTxComplete |
551 OHCI1394_reqTxComplete |
552 OHCI1394_isochRx |
553 OHCI1394_isochTx |
554 OHCI1394_postedWriteErr |
555 OHCI1394_cycleTooLong |
556 OHCI1394_cycleInconsistent);
557
558 /* Enable link */
559 reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_linkEnable);
560
561 buf = reg_read(ohci, OHCI1394_Version);
562 PRINT(KERN_INFO, "OHCI-1394 %d.%d (PCI): IRQ=[%d] "
563 "MMIO=[%llx-%llx] Max Packet=[%d] IR/IT contexts=[%d/%d]",
564 ((((buf) >> 16) & 0xf) + (((buf) >> 20) & 0xf) * 10),
565 ((((buf) >> 4) & 0xf) + ((buf) & 0xf) * 10), ohci->dev->irq,
566 (unsigned long long)pci_resource_start(ohci->dev, 0),
567 (unsigned long long)pci_resource_start(ohci->dev, 0) + OHCI1394_REGISTER_SIZE - 1,
568 ohci->max_packet_size,
569 ohci->nb_iso_rcv_ctx, ohci->nb_iso_xmit_ctx);
570
571 /* Check all of our ports to make sure that if anything is
572 * connected, we enable that port. */
573 num_ports = get_phy_reg(ohci, 2) & 0xf;
574 for (i = 0; i < num_ports; i++) {
575 unsigned int status;
576
577 set_phy_reg(ohci, 7, i);
578 status = get_phy_reg(ohci, 8);
579
580 if (status & 0x20)
581 set_phy_reg(ohci, 8, status & ~1);
582 }
583
584 /* Serial EEPROM Sanity check. */
585 if ((ohci->max_packet_size < 512) ||
586 (ohci->max_packet_size > 4096)) {
587 /* Serial EEPROM contents are suspect, set a sane max packet
588 * size and print the raw contents for bug reports if verbose
589 * debug is enabled. */
590 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
591 int i;
592 #endif
593
594 PRINT(KERN_DEBUG, "Serial EEPROM has suspicious values, "
595 "attempting to set max_packet_size to 512 bytes");
596 reg_write(ohci, OHCI1394_BusOptions,
597 (reg_read(ohci, OHCI1394_BusOptions) & 0xf007) | 0x8002);
598 ohci->max_packet_size = 512;
599 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
600 PRINT(KERN_DEBUG, " EEPROM Present: %d",
601 (reg_read(ohci, OHCI1394_Version) >> 24) & 0x1);
602 reg_write(ohci, OHCI1394_GUID_ROM, 0x80000000);
603
604 for (i = 0;
605 ((i < 1000) &&
606 (reg_read(ohci, OHCI1394_GUID_ROM) & 0x80000000)); i++)
607 udelay(10);
608
609 for (i = 0; i < 0x20; i++) {
610 reg_write(ohci, OHCI1394_GUID_ROM, 0x02000000);
611 PRINT(KERN_DEBUG, " EEPROM %02x: %02x", i,
612 (reg_read(ohci, OHCI1394_GUID_ROM) >> 16) & 0xff);
613 }
614 #endif
615 }
616 }
617
618 /*
619 * Insert a packet in the DMA fifo and generate the DMA prg
620 * FIXME: rewrite the program in order to accept packets crossing
621 * page boundaries.
622 * check also that a single dma descriptor doesn't cross a
623 * page boundary.
624 */
625 static void insert_packet(struct ti_ohci *ohci,
626 struct dma_trm_ctx *d, struct hpsb_packet *packet)
627 {
628 u32 cycleTimer;
629 int idx = d->prg_ind;
630
631 DBGMSG("Inserting packet for node " NODE_BUS_FMT
632 ", tlabel=%d, tcode=0x%x, speed=%d",
633 NODE_BUS_ARGS(ohci->host, packet->node_id), packet->tlabel,
634 packet->tcode, packet->speed_code);
635
636 d->prg_cpu[idx]->begin.address = 0;
637 d->prg_cpu[idx]->begin.branchAddress = 0;
638
639 if (d->type == DMA_CTX_ASYNC_RESP) {
640 /*
641 * For response packets, we need to put a timeout value in
642 * the 16 lower bits of the status... let's try 1 sec timeout
643 */
644 cycleTimer = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
645 d->prg_cpu[idx]->begin.status = cpu_to_le32(
646 (((((cycleTimer>>25)&0x7)+1)&0x7)<<13) |
647 ((cycleTimer&0x01fff000)>>12));
648
649 DBGMSG("cycleTimer: %08x timeStamp: %08x",
650 cycleTimer, d->prg_cpu[idx]->begin.status);
651 } else
652 d->prg_cpu[idx]->begin.status = 0;
653
654 if ( (packet->type == hpsb_async) || (packet->type == hpsb_raw) ) {
655
656 if (packet->type == hpsb_raw) {
657 d->prg_cpu[idx]->data[0] = cpu_to_le32(OHCI1394_TCODE_PHY<<4);
658 d->prg_cpu[idx]->data[1] = cpu_to_le32(packet->header[0]);
659 d->prg_cpu[idx]->data[2] = cpu_to_le32(packet->header[1]);
660 } else {
661 d->prg_cpu[idx]->data[0] = packet->speed_code<<16 |
662 (packet->header[0] & 0xFFFF);
663
664 if (packet->tcode == TCODE_ISO_DATA) {
665 /* Sending an async stream packet */
666 d->prg_cpu[idx]->data[1] = packet->header[0] & 0xFFFF0000;
667 } else {
668 /* Sending a normal async request or response */
669 d->prg_cpu[idx]->data[1] =
670 (packet->header[1] & 0xFFFF) |
671 (packet->header[0] & 0xFFFF0000);
672 d->prg_cpu[idx]->data[2] = packet->header[2];
673 d->prg_cpu[idx]->data[3] = packet->header[3];
674 }
675 header_le32_to_cpu(d->prg_cpu[idx]->data, packet->tcode);
676 }
677
678 if (packet->data_size) { /* block transmit */
679 if (packet->tcode == TCODE_STREAM_DATA){
680 d->prg_cpu[idx]->begin.control =
681 cpu_to_le32(DMA_CTL_OUTPUT_MORE |
682 DMA_CTL_IMMEDIATE | 0x8);
683 } else {
684 d->prg_cpu[idx]->begin.control =
685 cpu_to_le32(DMA_CTL_OUTPUT_MORE |
686 DMA_CTL_IMMEDIATE | 0x10);
687 }
688 d->prg_cpu[idx]->end.control =
689 cpu_to_le32(DMA_CTL_OUTPUT_LAST |
690 DMA_CTL_IRQ |
691 DMA_CTL_BRANCH |
692 packet->data_size);
693 /*
694 * Check that the packet data buffer
695 * does not cross a page boundary.
696 *
697 * XXX Fix this some day. eth1394 seems to trigger
698 * it, but ignoring it doesn't seem to cause a
699 * problem.
700 */
701 #if 0
702 if (cross_bound((unsigned long)packet->data,
703 packet->data_size)>0) {
704 /* FIXME: do something about it */
705 PRINT(KERN_ERR,
706 "%s: packet data addr: %p size %Zd bytes "
707 "cross page boundary", __func__,
708 packet->data, packet->data_size);
709 }
710 #endif
711 d->prg_cpu[idx]->end.address = cpu_to_le32(
712 pci_map_single(ohci->dev, packet->data,
713 packet->data_size,
714 PCI_DMA_TODEVICE));
715
716 d->prg_cpu[idx]->end.branchAddress = 0;
717 d->prg_cpu[idx]->end.status = 0;
718 if (d->branchAddrPtr)
719 *(d->branchAddrPtr) =
720 cpu_to_le32(d->prg_bus[idx] | 0x3);
721 d->branchAddrPtr =
722 &(d->prg_cpu[idx]->end.branchAddress);
723 } else { /* quadlet transmit */
724 if (packet->type == hpsb_raw)
725 d->prg_cpu[idx]->begin.control =
726 cpu_to_le32(DMA_CTL_OUTPUT_LAST |
727 DMA_CTL_IMMEDIATE |
728 DMA_CTL_IRQ |
729 DMA_CTL_BRANCH |
730 (packet->header_size + 4));
731 else
732 d->prg_cpu[idx]->begin.control =
733 cpu_to_le32(DMA_CTL_OUTPUT_LAST |
734 DMA_CTL_IMMEDIATE |
735 DMA_CTL_IRQ |
736 DMA_CTL_BRANCH |
737 packet->header_size);
738
739 if (d->branchAddrPtr)
740 *(d->branchAddrPtr) =
741 cpu_to_le32(d->prg_bus[idx] | 0x2);
742 d->branchAddrPtr =
743 &(d->prg_cpu[idx]->begin.branchAddress);
744 }
745
746 } else { /* iso packet */
747 d->prg_cpu[idx]->data[0] = packet->speed_code<<16 |
748 (packet->header[0] & 0xFFFF);
749 d->prg_cpu[idx]->data[1] = packet->header[0] & 0xFFFF0000;
750 header_le32_to_cpu(d->prg_cpu[idx]->data, packet->tcode);
751
752 d->prg_cpu[idx]->begin.control =
753 cpu_to_le32(DMA_CTL_OUTPUT_MORE |
754 DMA_CTL_IMMEDIATE | 0x8);
755 d->prg_cpu[idx]->end.control =
756 cpu_to_le32(DMA_CTL_OUTPUT_LAST |
757 DMA_CTL_UPDATE |
758 DMA_CTL_IRQ |
759 DMA_CTL_BRANCH |
760 packet->data_size);
761 d->prg_cpu[idx]->end.address = cpu_to_le32(
762 pci_map_single(ohci->dev, packet->data,
763 packet->data_size, PCI_DMA_TODEVICE));
764
765 d->prg_cpu[idx]->end.branchAddress = 0;
766 d->prg_cpu[idx]->end.status = 0;
767 DBGMSG("Iso xmit context info: header[%08x %08x]\n"
768 " begin=%08x %08x %08x %08x\n"
769 " %08x %08x %08x %08x\n"
770 " end =%08x %08x %08x %08x",
771 d->prg_cpu[idx]->data[0], d->prg_cpu[idx]->data[1],
772 d->prg_cpu[idx]->begin.control,
773 d->prg_cpu[idx]->begin.address,
774 d->prg_cpu[idx]->begin.branchAddress,
775 d->prg_cpu[idx]->begin.status,
776 d->prg_cpu[idx]->data[0],
777 d->prg_cpu[idx]->data[1],
778 d->prg_cpu[idx]->data[2],
779 d->prg_cpu[idx]->data[3],
780 d->prg_cpu[idx]->end.control,
781 d->prg_cpu[idx]->end.address,
782 d->prg_cpu[idx]->end.branchAddress,
783 d->prg_cpu[idx]->end.status);
784 if (d->branchAddrPtr)
785 *(d->branchAddrPtr) = cpu_to_le32(d->prg_bus[idx] | 0x3);
786 d->branchAddrPtr = &(d->prg_cpu[idx]->end.branchAddress);
787 }
788 d->free_prgs--;
789
790 /* queue the packet in the appropriate context queue */
791 list_add_tail(&packet->driver_list, &d->fifo_list);
792 d->prg_ind = (d->prg_ind + 1) % d->num_desc;
793 }
794
795 /*
796 * This function fills the FIFO with the (eventual) pending packets
797 * and runs or wakes up the DMA prg if necessary.
798 *
799 * The function MUST be called with the d->lock held.
800 */
801 static void dma_trm_flush(struct ti_ohci *ohci, struct dma_trm_ctx *d)
802 {
803 struct hpsb_packet *packet, *ptmp;
804 int idx = d->prg_ind;
805 int z = 0;
806
807 /* insert the packets into the dma fifo */
808 list_for_each_entry_safe(packet, ptmp, &d->pending_list, driver_list) {
809 if (!d->free_prgs)
810 break;
811
812 /* For the first packet only */
813 if (!z)
814 z = (packet->data_size) ? 3 : 2;
815
816 /* Insert the packet */
817 list_del_init(&packet->driver_list);
818 insert_packet(ohci, d, packet);
819 }
820
821 /* Nothing must have been done, either no free_prgs or no packets */
822 if (z == 0)
823 return;
824
825 /* Is the context running ? (should be unless it is
826 the first packet to be sent in this context) */
827 if (!(reg_read(ohci, d->ctrlSet) & 0x8000)) {
828 u32 nodeId = reg_read(ohci, OHCI1394_NodeID);
829
830 DBGMSG("Starting transmit DMA ctx=%d",d->ctx);
831 reg_write(ohci, d->cmdPtr, d->prg_bus[idx] | z);
832
833 /* Check that the node id is valid, and not 63 */
834 if (!(nodeId & 0x80000000) || (nodeId & 0x3f) == 63)
835 PRINT(KERN_ERR, "Running dma failed because Node ID is not valid");
836 else
837 reg_write(ohci, d->ctrlSet, 0x8000);
838 } else {
839 /* Wake up the dma context if necessary */
840 if (!(reg_read(ohci, d->ctrlSet) & 0x400))
841 DBGMSG("Waking transmit DMA ctx=%d",d->ctx);
842
843 /* do this always, to avoid race condition */
844 reg_write(ohci, d->ctrlSet, 0x1000);
845 }
846
847 return;
848 }
849
850 /* Transmission of an async or iso packet */
851 static int ohci_transmit(struct hpsb_host *host, struct hpsb_packet *packet)
852 {
853 struct ti_ohci *ohci = host->hostdata;
854 struct dma_trm_ctx *d;
855 unsigned long flags;
856
857 if (packet->data_size > ohci->max_packet_size) {
858 PRINT(KERN_ERR,
859 "Transmit packet size %Zd is too big",
860 packet->data_size);
861 return -EOVERFLOW;
862 }
863
864 if (packet->type == hpsb_raw)
865 d = &ohci->at_req_context;
866 else if ((packet->tcode & 0x02) && (packet->tcode != TCODE_ISO_DATA))
867 d = &ohci->at_resp_context;
868 else
869 d = &ohci->at_req_context;
870
871 spin_lock_irqsave(&d->lock,flags);
872
873 list_add_tail(&packet->driver_list, &d->pending_list);
874
875 dma_trm_flush(ohci, d);
876
877 spin_unlock_irqrestore(&d->lock,flags);
878
879 return 0;
880 }
881
882 static int ohci_devctl(struct hpsb_host *host, enum devctl_cmd cmd, int arg)
883 {
884 struct ti_ohci *ohci = host->hostdata;
885 int retval = 0, phy_reg;
886
887 switch (cmd) {
888 case RESET_BUS:
889 switch (arg) {
890 case SHORT_RESET:
891 phy_reg = get_phy_reg(ohci, 5);
892 phy_reg |= 0x40;
893 set_phy_reg(ohci, 5, phy_reg); /* set ISBR */
894 break;
895 case LONG_RESET:
896 phy_reg = get_phy_reg(ohci, 1);
897 phy_reg |= 0x40;
898 set_phy_reg(ohci, 1, phy_reg); /* set IBR */
899 break;
900 case SHORT_RESET_NO_FORCE_ROOT:
901 phy_reg = get_phy_reg(ohci, 1);
902 if (phy_reg & 0x80) {
903 phy_reg &= ~0x80;
904 set_phy_reg(ohci, 1, phy_reg); /* clear RHB */
905 }
906
907 phy_reg = get_phy_reg(ohci, 5);
908 phy_reg |= 0x40;
909 set_phy_reg(ohci, 5, phy_reg); /* set ISBR */
910 break;
911 case LONG_RESET_NO_FORCE_ROOT:
912 phy_reg = get_phy_reg(ohci, 1);
913 phy_reg &= ~0x80;
914 phy_reg |= 0x40;
915 set_phy_reg(ohci, 1, phy_reg); /* clear RHB, set IBR */
916 break;
917 case SHORT_RESET_FORCE_ROOT:
918 phy_reg = get_phy_reg(ohci, 1);
919 if (!(phy_reg & 0x80)) {
920 phy_reg |= 0x80;
921 set_phy_reg(ohci, 1, phy_reg); /* set RHB */
922 }
923
924 phy_reg = get_phy_reg(ohci, 5);
925 phy_reg |= 0x40;
926 set_phy_reg(ohci, 5, phy_reg); /* set ISBR */
927 break;
928 case LONG_RESET_FORCE_ROOT:
929 phy_reg = get_phy_reg(ohci, 1);
930 phy_reg |= 0xc0;
931 set_phy_reg(ohci, 1, phy_reg); /* set RHB and IBR */
932 break;
933 default:
934 retval = -1;
935 }
936 break;
937
938 case GET_CYCLE_COUNTER:
939 retval = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
940 break;
941
942 case SET_CYCLE_COUNTER:
943 reg_write(ohci, OHCI1394_IsochronousCycleTimer, arg);
944 break;
945
946 case SET_BUS_ID:
947 PRINT(KERN_ERR, "devctl command SET_BUS_ID err");
948 break;
949
950 case ACT_CYCLE_MASTER:
951 if (arg) {
952 /* check if we are root and other nodes are present */
953 u32 nodeId = reg_read(ohci, OHCI1394_NodeID);
954 if ((nodeId & (1<<30)) && (nodeId & 0x3f)) {
955 /*
956 * enable cycleTimer, cycleMaster
957 */
958 DBGMSG("Cycle master enabled");
959 reg_write(ohci, OHCI1394_LinkControlSet,
960 OHCI1394_LinkControl_CycleTimerEnable |
961 OHCI1394_LinkControl_CycleMaster);
962 }
963 } else {
964 /* disable cycleTimer, cycleMaster, cycleSource */
965 reg_write(ohci, OHCI1394_LinkControlClear,
966 OHCI1394_LinkControl_CycleTimerEnable |
967 OHCI1394_LinkControl_CycleMaster |
968 OHCI1394_LinkControl_CycleSource);
969 }
970 break;
971
972 case CANCEL_REQUESTS:
973 DBGMSG("Cancel request received");
974 dma_trm_reset(&ohci->at_req_context);
975 dma_trm_reset(&ohci->at_resp_context);
976 break;
977
978 default:
979 PRINT_G(KERN_ERR, "ohci_devctl cmd %d not implemented yet",
980 cmd);
981 break;
982 }
983 return retval;
984 }
985
986 /***********************************
987 * rawiso ISO reception *
988 ***********************************/
989
990 /*
991 We use either buffer-fill or packet-per-buffer DMA mode. The DMA
992 buffer is split into "blocks" (regions described by one DMA
993 descriptor). Each block must be one page or less in size, and
994 must not cross a page boundary.
995
996 There is one little wrinkle with buffer-fill mode: a packet that
997 starts in the final block may wrap around into the first block. But
998 the user API expects all packets to be contiguous. Our solution is
999 to keep the very last page of the DMA buffer in reserve - if a
1000 packet spans the gap, we copy its tail into this page.
1001 */
1002
1003 struct ohci_iso_recv {
1004 struct ti_ohci *ohci;
1005
1006 struct ohci1394_iso_tasklet task;
1007 int task_active;
1008
1009 enum { BUFFER_FILL_MODE = 0,
1010 PACKET_PER_BUFFER_MODE = 1 } dma_mode;
1011
1012 /* memory and PCI mapping for the DMA descriptors */
1013 struct dma_prog_region prog;
1014 struct dma_cmd *block; /* = (struct dma_cmd*) prog.virt */
1015
1016 /* how many DMA blocks fit in the buffer */
1017 unsigned int nblocks;
1018
1019 /* stride of DMA blocks */
1020 unsigned int buf_stride;
1021
1022 /* number of blocks to batch between interrupts */
1023 int block_irq_interval;
1024
1025 /* block that DMA will finish next */
1026 int block_dma;
1027
1028 /* (buffer-fill only) block that the reader will release next */
1029 int block_reader;
1030
1031 /* (buffer-fill only) bytes of buffer the reader has released,
1032 less than one block */
1033 int released_bytes;
1034
1035 /* (buffer-fill only) buffer offset at which the next packet will appear */
1036 int dma_offset;
1037
1038 /* OHCI DMA context control registers */
1039 u32 ContextControlSet;
1040 u32 ContextControlClear;
1041 u32 CommandPtr;
1042 u32 ContextMatch;
1043 };
1044
1045 static void ohci_iso_recv_task(unsigned long data);
1046 static void ohci_iso_recv_stop(struct hpsb_iso *iso);
1047 static void ohci_iso_recv_shutdown(struct hpsb_iso *iso);
1048 static int ohci_iso_recv_start(struct hpsb_iso *iso, int cycle, int tag_mask, int sync);
1049 static void ohci_iso_recv_program(struct hpsb_iso *iso);
1050
1051 static int ohci_iso_recv_init(struct hpsb_iso *iso)
1052 {
1053 struct ti_ohci *ohci = iso->host->hostdata;
1054 struct ohci_iso_recv *recv;
1055 int ctx;
1056 int ret = -ENOMEM;
1057
1058 recv = kmalloc(sizeof(*recv), GFP_KERNEL);
1059 if (!recv)
1060 return -ENOMEM;
1061
1062 iso->hostdata = recv;
1063 recv->ohci = ohci;
1064 recv->task_active = 0;
1065 dma_prog_region_init(&recv->prog);
1066 recv->block = NULL;
1067
1068 /* use buffer-fill mode, unless irq_interval is 1
1069 (note: multichannel requires buffer-fill) */
1070
1071 if (((iso->irq_interval == 1 && iso->dma_mode == HPSB_ISO_DMA_OLD_ABI) ||
1072 iso->dma_mode == HPSB_ISO_DMA_PACKET_PER_BUFFER) && iso->channel != -1) {
1073 recv->dma_mode = PACKET_PER_BUFFER_MODE;
1074 } else {
1075 recv->dma_mode = BUFFER_FILL_MODE;
1076 }
1077
1078 /* set nblocks, buf_stride, block_irq_interval */
1079
1080 if (recv->dma_mode == BUFFER_FILL_MODE) {
1081 recv->buf_stride = PAGE_SIZE;
1082
1083 /* one block per page of data in the DMA buffer, minus the final guard page */
1084 recv->nblocks = iso->buf_size/PAGE_SIZE - 1;
1085 if (recv->nblocks < 3) {
1086 DBGMSG("ohci_iso_recv_init: DMA buffer too small");
1087 goto err;
1088 }
1089
1090 /* iso->irq_interval is in packets - translate that to blocks */
1091 if (iso->irq_interval == 1)
1092 recv->block_irq_interval = 1;
1093 else
1094 recv->block_irq_interval = iso->irq_interval *
1095 ((recv->nblocks+1)/iso->buf_packets);
1096 if (recv->block_irq_interval*4 > recv->nblocks)
1097 recv->block_irq_interval = recv->nblocks/4;
1098 if (recv->block_irq_interval < 1)
1099 recv->block_irq_interval = 1;
1100
1101 } else {
1102 int max_packet_size;
1103
1104 recv->nblocks = iso->buf_packets;
1105 recv->block_irq_interval = iso->irq_interval;
1106 if (recv->block_irq_interval * 4 > iso->buf_packets)
1107 recv->block_irq_interval = iso->buf_packets / 4;
1108 if (recv->block_irq_interval < 1)
1109 recv->block_irq_interval = 1;
1110
1111 /* choose a buffer stride */
1112 /* must be a power of 2, and <= PAGE_SIZE */
1113
1114 max_packet_size = iso->buf_size / iso->buf_packets;
1115
1116 for (recv->buf_stride = 8; recv->buf_stride < max_packet_size;
1117 recv->buf_stride *= 2);
1118
1119 if (recv->buf_stride*iso->buf_packets > iso->buf_size ||
1120 recv->buf_stride > PAGE_SIZE) {
1121 /* this shouldn't happen, but anyway... */
1122 DBGMSG("ohci_iso_recv_init: problem choosing a buffer stride");
1123 goto err;
1124 }
1125 }
1126
1127 recv->block_reader = 0;
1128 recv->released_bytes = 0;
1129 recv->block_dma = 0;
1130 recv->dma_offset = 0;
1131
1132 /* size of DMA program = one descriptor per block */
1133 if (dma_prog_region_alloc(&recv->prog,
1134 sizeof(struct dma_cmd) * recv->nblocks,
1135 recv->ohci->dev))
1136 goto err;
1137
1138 recv->block = (struct dma_cmd*) recv->prog.kvirt;
1139
1140 ohci1394_init_iso_tasklet(&recv->task,
1141 iso->channel == -1 ? OHCI_ISO_MULTICHANNEL_RECEIVE :
1142 OHCI_ISO_RECEIVE,
1143 ohci_iso_recv_task, (unsigned long) iso);
1144
1145 if (ohci1394_register_iso_tasklet(recv->ohci, &recv->task) < 0) {
1146 ret = -EBUSY;
1147 goto err;
1148 }
1149
1150 recv->task_active = 1;
1151
1152 /* recv context registers are spaced 32 bytes apart */
1153 ctx = recv->task.context;
1154 recv->ContextControlSet = OHCI1394_IsoRcvContextControlSet + 32 * ctx;
1155 recv->ContextControlClear = OHCI1394_IsoRcvContextControlClear + 32 * ctx;
1156 recv->CommandPtr = OHCI1394_IsoRcvCommandPtr + 32 * ctx;
1157 recv->ContextMatch = OHCI1394_IsoRcvContextMatch + 32 * ctx;
1158
1159 if (iso->channel == -1) {
1160 /* clear multi-channel selection mask */
1161 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskHiClear, 0xFFFFFFFF);
1162 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskLoClear, 0xFFFFFFFF);
1163 }
1164
1165 /* write the DMA program */
1166 ohci_iso_recv_program(iso);
1167
1168 DBGMSG("ohci_iso_recv_init: %s mode, DMA buffer is %lu pages"
1169 " (%u bytes), using %u blocks, buf_stride %u, block_irq_interval %d",
1170 recv->dma_mode == BUFFER_FILL_MODE ?
1171 "buffer-fill" : "packet-per-buffer",
1172 iso->buf_size/PAGE_SIZE, iso->buf_size,
1173 recv->nblocks, recv->buf_stride, recv->block_irq_interval);
1174
1175 return 0;
1176
1177 err:
1178 ohci_iso_recv_shutdown(iso);
1179 return ret;
1180 }
1181
1182 static void ohci_iso_recv_stop(struct hpsb_iso *iso)
1183 {
1184 struct ohci_iso_recv *recv = iso->hostdata;
1185
1186 /* disable interrupts */
1187 reg_write(recv->ohci, OHCI1394_IsoRecvIntMaskClear, 1 << recv->task.context);
1188
1189 /* halt DMA */
1190 ohci1394_stop_context(recv->ohci, recv->ContextControlClear, NULL);
1191 }
1192
1193 static void ohci_iso_recv_shutdown(struct hpsb_iso *iso)
1194 {
1195 struct ohci_iso_recv *recv = iso->hostdata;
1196
1197 if (recv->task_active) {
1198 ohci_iso_recv_stop(iso);
1199 ohci1394_unregister_iso_tasklet(recv->ohci, &recv->task);
1200 recv->task_active = 0;
1201 }
1202
1203 dma_prog_region_free(&recv->prog);
1204 kfree(recv);
1205 iso->hostdata = NULL;
1206 }
1207
1208 /* set up a "gapped" ring buffer DMA program */
1209 static void ohci_iso_recv_program(struct hpsb_iso *iso)
1210 {
1211 struct ohci_iso_recv *recv = iso->hostdata;
1212 int blk;
1213
1214 /* address of 'branch' field in previous DMA descriptor */
1215 u32 *prev_branch = NULL;
1216
1217 for (blk = 0; blk < recv->nblocks; blk++) {
1218 u32 control;
1219
1220 /* the DMA descriptor */
1221 struct dma_cmd *cmd = &recv->block[blk];
1222
1223 /* offset of the DMA descriptor relative to the DMA prog buffer */
1224 unsigned long prog_offset = blk * sizeof(struct dma_cmd);
1225
1226 /* offset of this packet's data within the DMA buffer */
1227 unsigned long buf_offset = blk * recv->buf_stride;
1228
1229 if (recv->dma_mode == BUFFER_FILL_MODE) {
1230 control = 2 << 28; /* INPUT_MORE */
1231 } else {
1232 control = 3 << 28; /* INPUT_LAST */
1233 }
1234
1235 control |= 8 << 24; /* s = 1, update xferStatus and resCount */
1236
1237 /* interrupt on last block, and at intervals */
1238 if (blk == recv->nblocks-1 || (blk % recv->block_irq_interval) == 0) {
1239 control |= 3 << 20; /* want interrupt */
1240 }
1241
1242 control |= 3 << 18; /* enable branch to address */
1243 control |= recv->buf_stride;
1244
1245 cmd->control = cpu_to_le32(control);
1246 cmd->address = cpu_to_le32(dma_region_offset_to_bus(&iso->data_buf, buf_offset));
1247 cmd->branchAddress = 0; /* filled in on next loop */
1248 cmd->status = cpu_to_le32(recv->buf_stride);
1249
1250 /* link the previous descriptor to this one */
1251 if (prev_branch) {
1252 *prev_branch = cpu_to_le32(dma_prog_region_offset_to_bus(&recv->prog, prog_offset) | 1);
1253 }
1254
1255 prev_branch = &cmd->branchAddress;
1256 }
1257
1258 /* the final descriptor's branch address and Z should be left at 0 */
1259 }
1260
1261 /* listen or unlisten to a specific channel (multi-channel mode only) */
1262 static void ohci_iso_recv_change_channel(struct hpsb_iso *iso, unsigned char channel, int listen)
1263 {
1264 struct ohci_iso_recv *recv = iso->hostdata;
1265 int reg, i;
1266
1267 if (channel < 32) {
1268 reg = listen ? OHCI1394_IRMultiChanMaskLoSet : OHCI1394_IRMultiChanMaskLoClear;
1269 i = channel;
1270 } else {
1271 reg = listen ? OHCI1394_IRMultiChanMaskHiSet : OHCI1394_IRMultiChanMaskHiClear;
1272 i = channel - 32;
1273 }
1274
1275 reg_write(recv->ohci, reg, (1 << i));
1276
1277 /* issue a dummy read to force all PCI writes to be posted immediately */
1278 mb();
1279 reg_read(recv->ohci, OHCI1394_IsochronousCycleTimer);
1280 }
1281
1282 static void ohci_iso_recv_set_channel_mask(struct hpsb_iso *iso, u64 mask)
1283 {
1284 struct ohci_iso_recv *recv = iso->hostdata;
1285 int i;
1286
1287 for (i = 0; i < 64; i++) {
1288 if (mask & (1ULL << i)) {
1289 if (i < 32)
1290 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskLoSet, (1 << i));
1291 else
1292 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskHiSet, (1 << (i-32)));
1293 } else {
1294 if (i < 32)
1295 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskLoClear, (1 << i));
1296 else
1297 reg_write(recv->ohci, OHCI1394_IRMultiChanMaskHiClear, (1 << (i-32)));
1298 }
1299 }
1300
1301 /* issue a dummy read to force all PCI writes to be posted immediately */
1302 mb();
1303 reg_read(recv->ohci, OHCI1394_IsochronousCycleTimer);
1304 }
1305
1306 static int ohci_iso_recv_start(struct hpsb_iso *iso, int cycle, int tag_mask, int sync)
1307 {
1308 struct ohci_iso_recv *recv = iso->hostdata;
1309 struct ti_ohci *ohci = recv->ohci;
1310 u32 command, contextMatch;
1311
1312 reg_write(recv->ohci, recv->ContextControlClear, 0xFFFFFFFF);
1313 wmb();
1314
1315 /* always keep ISO headers */
1316 command = (1 << 30);
1317
1318 if (recv->dma_mode == BUFFER_FILL_MODE)
1319 command |= (1 << 31);
1320
1321 reg_write(recv->ohci, recv->ContextControlSet, command);
1322
1323 /* match on specified tags */
1324 contextMatch = tag_mask << 28;
1325
1326 if (iso->channel == -1) {
1327 /* enable multichannel reception */
1328 reg_write(recv->ohci, recv->ContextControlSet, (1 << 28));
1329 } else {
1330 /* listen on channel */
1331 contextMatch |= iso->channel;
1332 }
1333
1334 if (cycle != -1) {
1335 u32 seconds;
1336
1337 /* enable cycleMatch */
1338 reg_write(recv->ohci, recv->ContextControlSet, (1 << 29));
1339
1340 /* set starting cycle */
1341 cycle &= 0x1FFF;
1342
1343 /* 'cycle' is only mod 8000, but we also need two 'seconds' bits -
1344 just snarf them from the current time */
1345 seconds = reg_read(recv->ohci, OHCI1394_IsochronousCycleTimer) >> 25;
1346
1347 /* advance one second to give some extra time for DMA to start */
1348 seconds += 1;
1349
1350 cycle |= (seconds & 3) << 13;
1351
1352 contextMatch |= cycle << 12;
1353 }
1354
1355 if (sync != -1) {
1356 /* set sync flag on first DMA descriptor */
1357 struct dma_cmd *cmd = &recv->block[recv->block_dma];
1358 cmd->control |= cpu_to_le32(DMA_CTL_WAIT);
1359
1360 /* match sync field */
1361 contextMatch |= (sync&0xf)<<8;
1362 }
1363
1364 reg_write(recv->ohci, recv->ContextMatch, contextMatch);
1365
1366 /* address of first descriptor block */
1367 command = dma_prog_region_offset_to_bus(&recv->prog,
1368 recv->block_dma * sizeof(struct dma_cmd));
1369 command |= 1; /* Z=1 */
1370
1371 reg_write(recv->ohci, recv->CommandPtr, command);
1372
1373 /* enable interrupts */
1374 reg_write(recv->ohci, OHCI1394_IsoRecvIntMaskSet, 1 << recv->task.context);
1375
1376 wmb();
1377
1378 /* run */
1379 reg_write(recv->ohci, recv->ContextControlSet, 0x8000);
1380
1381 /* issue a dummy read of the cycle timer register to force
1382 all PCI writes to be posted immediately */
1383 mb();
1384 reg_read(recv->ohci, OHCI1394_IsochronousCycleTimer);
1385
1386 /* check RUN */
1387 if (!(reg_read(recv->ohci, recv->ContextControlSet) & 0x8000)) {
1388 PRINT(KERN_ERR,
1389 "Error starting IR DMA (ContextControl 0x%08x)\n",
1390 reg_read(recv->ohci, recv->ContextControlSet));
1391 return -1;
1392 }
1393
1394 return 0;
1395 }
1396
1397 static void ohci_iso_recv_release_block(struct ohci_iso_recv *recv, int block)
1398 {
1399 /* re-use the DMA descriptor for the block */
1400 /* by linking the previous descriptor to it */
1401
1402 int next_i = block;
1403 int prev_i = (next_i == 0) ? (recv->nblocks - 1) : (next_i - 1);
1404
1405 struct dma_cmd *next = &recv->block[next_i];
1406 struct dma_cmd *prev = &recv->block[prev_i];
1407
1408 /* ignore out-of-range requests */
1409 if ((block < 0) || (block > recv->nblocks))
1410 return;
1411
1412 /* 'next' becomes the new end of the DMA chain,
1413 so disable branch and enable interrupt */
1414 next->branchAddress = 0;
1415 next->control |= cpu_to_le32(3 << 20);
1416 next->status = cpu_to_le32(recv->buf_stride);
1417
1418 /* link prev to next */
1419 prev->branchAddress = cpu_to_le32(dma_prog_region_offset_to_bus(&recv->prog,
1420 sizeof(struct dma_cmd) * next_i)
1421 | 1); /* Z=1 */
1422
1423 /* disable interrupt on previous DMA descriptor, except at intervals */
1424 if ((prev_i % recv->block_irq_interval) == 0) {
1425 prev->control |= cpu_to_le32(3 << 20); /* enable interrupt */
1426 } else {
1427 prev->control &= cpu_to_le32(~(3<<20)); /* disable interrupt */
1428 }
1429 wmb();
1430
1431 /* wake up DMA in case it fell asleep */
1432 reg_write(recv->ohci, recv->ContextControlSet, (1 << 12));
1433 }
1434
1435 static void ohci_iso_recv_bufferfill_release(struct ohci_iso_recv *recv,
1436 struct hpsb_iso_packet_info *info)
1437 {
1438 /* release the memory where the packet was */
1439 recv->released_bytes += info->total_len;
1440
1441 /* have we released enough memory for one block? */
1442 while (recv->released_bytes > recv->buf_stride) {
1443 ohci_iso_recv_release_block(recv, recv->block_reader);
1444 recv->block_reader = (recv->block_reader + 1) % recv->nblocks;
1445 recv->released_bytes -= recv->buf_stride;
1446 }
1447 }
1448
1449 static inline void ohci_iso_recv_release(struct hpsb_iso *iso, struct hpsb_iso_packet_info *info)
1450 {
1451 struct ohci_iso_recv *recv = iso->hostdata;
1452 if (recv->dma_mode == BUFFER_FILL_MODE) {
1453 ohci_iso_recv_bufferfill_release(recv, info);
1454 } else {
1455 ohci_iso_recv_release_block(recv, info - iso->infos);
1456 }
1457 }
1458
1459 /* parse all packets from blocks that have been fully received */
1460 static void ohci_iso_recv_bufferfill_parse(struct hpsb_iso *iso, struct ohci_iso_recv *recv)
1461 {
1462 int wake = 0;
1463 int runaway = 0;
1464 struct ti_ohci *ohci = recv->ohci;
1465
1466 while (1) {
1467 /* we expect the next parsable packet to begin at recv->dma_offset */
1468 /* note: packet layout is as shown in section 10.6.1.1 of the OHCI spec */
1469
1470 unsigned int offset;
1471 unsigned short len, cycle, total_len;
1472 unsigned char channel, tag, sy;
1473
1474 unsigned char *p = iso->data_buf.kvirt;
1475
1476 unsigned int this_block = recv->dma_offset/recv->buf_stride;
1477
1478 /* don't loop indefinitely */
1479 if (runaway++ > 100000) {
1480 atomic_inc(&iso->overflows);
1481 PRINT(KERN_ERR,
1482 "IR DMA error - Runaway during buffer parsing!\n");
1483 break;
1484 }
1485
1486 /* stop parsing once we arrive at block_dma (i.e. don't get ahead of DMA) */
1487 if (this_block == recv->block_dma)
1488 break;
1489
1490 wake = 1;
1491
1492 /* parse data length, tag, channel, and sy */
1493
1494 /* note: we keep our own local copies of 'len' and 'offset'
1495 so the user can't mess with them by poking in the mmap area */
1496
1497 len = p[recv->dma_offset+2] | (p[recv->dma_offset+3] << 8);
1498
1499 if (len > 4096) {
1500 PRINT(KERN_ERR,
1501 "IR DMA error - bogus 'len' value %u\n", len);
1502 }
1503
1504 channel = p[recv->dma_offset+1] & 0x3F;
1505 tag = p[recv->dma_offset+1] >> 6;
1506 sy = p[recv->dma_offset+0] & 0xF;
1507
1508 /* advance to data payload */
1509 recv->dma_offset += 4;
1510
1511 /* check for wrap-around */
1512 if (recv->dma_offset >= recv->buf_stride*recv->nblocks) {
1513 recv->dma_offset -= recv->buf_stride*recv->nblocks;
1514 }
1515
1516 /* dma_offset now points to the first byte of the data payload */
1517 offset = recv->dma_offset;
1518
1519 /* advance to xferStatus/timeStamp */
1520 recv->dma_offset += len;
1521
1522 total_len = len + 8; /* 8 bytes header+trailer in OHCI packet */
1523 /* payload is padded to 4 bytes */
1524 if (len % 4) {
1525 recv->dma_offset += 4 - (len%4);
1526 total_len += 4 - (len%4);
1527 }
1528
1529 /* check for wrap-around */
1530 if (recv->dma_offset >= recv->buf_stride*recv->nblocks) {
1531 /* uh oh, the packet data wraps from the last
1532 to the first DMA block - make the packet
1533 contiguous by copying its "tail" into the
1534 guard page */
1535
1536 int guard_off = recv->buf_stride*recv->nblocks;
1537 int tail_len = len - (guard_off - offset);
1538
1539 if (tail_len > 0 && tail_len < recv->buf_stride) {
1540 memcpy(iso->data_buf.kvirt + guard_off,
1541 iso->data_buf.kvirt,
1542 tail_len);
1543 }
1544
1545 recv->dma_offset -= recv->buf_stride*recv->nblocks;
1546 }
1547
1548 /* parse timestamp */
1549 cycle = p[recv->dma_offset+0] | (p[recv->dma_offset+1]<<8);
1550 cycle &= 0x1FFF;
1551
1552 /* advance to next packet */
1553 recv->dma_offset += 4;
1554
1555 /* check for wrap-around */
1556 if (recv->dma_offset >= recv->buf_stride*recv->nblocks) {
1557 recv->dma_offset -= recv->buf_stride*recv->nblocks;
1558 }
1559
1560 hpsb_iso_packet_received(iso, offset, len, total_len, cycle, channel, tag, sy);
1561 }
1562
1563 if (wake)
1564 hpsb_iso_wake(iso);
1565 }
1566
1567 static void ohci_iso_recv_bufferfill_task(struct hpsb_iso *iso, struct ohci_iso_recv *recv)
1568 {
1569 int loop;
1570 struct ti_ohci *ohci = recv->ohci;
1571
1572 /* loop over all blocks */
1573 for (loop = 0; loop < recv->nblocks; loop++) {
1574
1575 /* check block_dma to see if it's done */
1576 struct dma_cmd *im = &recv->block[recv->block_dma];
1577
1578 /* check the DMA descriptor for new writes to xferStatus */
1579 u16 xferstatus = le32_to_cpu(im->status) >> 16;
1580
1581 /* rescount is the number of bytes *remaining to be written* in the block */
1582 u16 rescount = le32_to_cpu(im->status) & 0xFFFF;
1583
1584 unsigned char event = xferstatus & 0x1F;
1585
1586 if (!event) {
1587 /* nothing has happened to this block yet */
1588 break;
1589 }
1590
1591 if (event != 0x11) {
1592 atomic_inc(&iso->overflows);
1593 PRINT(KERN_ERR,
1594 "IR DMA error - OHCI error code 0x%02x\n", event);
1595 }
1596
1597 if (rescount != 0) {
1598 /* the card is still writing to this block;
1599 we can't touch it until it's done */
1600 break;
1601 }
1602
1603 /* OK, the block is finished... */
1604
1605 /* sync our view of the block */
1606 dma_region_sync_for_cpu(&iso->data_buf, recv->block_dma*recv->buf_stride, recv->buf_stride);
1607
1608 /* reset the DMA descriptor */
1609 im->status = recv->buf_stride;
1610
1611 /* advance block_dma */
1612 recv->block_dma = (recv->block_dma + 1) % recv->nblocks;
1613
1614 if ((recv->block_dma+1) % recv->nblocks == recv->block_reader) {
1615 atomic_inc(&iso->overflows);
1616 DBGMSG("ISO reception overflow - "
1617 "ran out of DMA blocks");
1618 }
1619 }
1620
1621 /* parse any packets that have arrived */
1622 ohci_iso_recv_bufferfill_parse(iso, recv);
1623 }
1624
1625 static void ohci_iso_recv_packetperbuf_task(struct hpsb_iso *iso, struct ohci_iso_recv *recv)
1626 {
1627 int count;
1628 int wake = 0;
1629 struct ti_ohci *ohci = recv->ohci;
1630
1631 /* loop over the entire buffer */
1632 for (count = 0; count < recv->nblocks; count++) {
1633 u32 packet_len = 0;
1634
1635 /* pointer to the DMA descriptor */
1636 struct dma_cmd *il = ((struct dma_cmd*) recv->prog.kvirt) + iso->pkt_dma;
1637
1638 /* check the DMA descriptor for new writes to xferStatus */
1639 u16 xferstatus = le32_to_cpu(il->status) >> 16;
1640 u16 rescount = le32_to_cpu(il->status) & 0xFFFF;
1641
1642 unsigned char event = xferstatus & 0x1F;
1643
1644 if (!event) {
1645 /* this packet hasn't come in yet; we are done for now */
1646 goto out;
1647 }
1648
1649 if (event == 0x11) {
1650 /* packet received successfully! */
1651
1652 /* rescount is the number of bytes *remaining* in the packet buffer,
1653 after the packet was written */
1654 packet_len = recv->buf_stride - rescount;
1655
1656 } else if (event == 0x02) {
1657 PRINT(KERN_ERR, "IR DMA error - packet too long for buffer\n");
1658 } else if (event) {
1659 PRINT(KERN_ERR, "IR DMA error - OHCI error code 0x%02x\n", event);
1660 }
1661
1662 /* sync our view of the buffer */
1663 dma_region_sync_for_cpu(&iso->data_buf, iso->pkt_dma * recv->buf_stride, recv->buf_stride);
1664
1665 /* record the per-packet info */
1666 {
1667 /* iso header is 8 bytes ahead of the data payload */
1668 unsigned char *hdr;
1669
1670 unsigned int offset;
1671 unsigned short cycle;
1672 unsigned char channel, tag, sy;
1673
1674 offset = iso->pkt_dma * recv->buf_stride;
1675 hdr = iso->data_buf.kvirt + offset;
1676
1677 /* skip iso header */
1678 offset += 8;
1679 packet_len -= 8;
1680
1681 cycle = (hdr[0] | (hdr[1] << 8)) & 0x1FFF;
1682 channel = hdr[5] & 0x3F;
1683 tag = hdr[5] >> 6;
1684 sy = hdr[4] & 0xF;
1685
1686 hpsb_iso_packet_received(iso, offset, packet_len,
1687 recv->buf_stride, cycle, channel, tag, sy);
1688 }
1689
1690 /* reset the DMA descriptor */
1691 il->status = recv->buf_stride;
1692
1693 wake = 1;
1694 recv->block_dma = iso->pkt_dma;
1695 }
1696
1697 out:
1698 if (wake)
1699 hpsb_iso_wake(iso);
1700 }
1701
1702 static void ohci_iso_recv_task(unsigned long data)
1703 {
1704 struct hpsb_iso *iso = (struct hpsb_iso*) data;
1705 struct ohci_iso_recv *recv = iso->hostdata;
1706
1707 if (recv->dma_mode == BUFFER_FILL_MODE)
1708 ohci_iso_recv_bufferfill_task(iso, recv);
1709 else
1710 ohci_iso_recv_packetperbuf_task(iso, recv);
1711 }
1712
1713 /***********************************
1714 * rawiso ISO transmission *
1715 ***********************************/
1716
1717 struct ohci_iso_xmit {
1718 struct ti_ohci *ohci;
1719 struct dma_prog_region prog;
1720 struct ohci1394_iso_tasklet task;
1721 int task_active;
1722 int last_cycle;
1723 atomic_t skips;
1724
1725 u32 ContextControlSet;
1726 u32 ContextControlClear;
1727 u32 CommandPtr;
1728 };
1729
1730 /* transmission DMA program:
1731 one OUTPUT_MORE_IMMEDIATE for the IT header
1732 one OUTPUT_LAST for the buffer data */
1733
1734 struct iso_xmit_cmd {
1735 struct dma_cmd output_more_immediate;
1736 u8 iso_hdr[8];
1737 u32 unused[2];
1738 struct dma_cmd output_last;
1739 };
1740
1741 static int ohci_iso_xmit_init(struct hpsb_iso *iso);
1742 static int ohci_iso_xmit_start(struct hpsb_iso *iso, int cycle);
1743 static void ohci_iso_xmit_shutdown(struct hpsb_iso *iso);
1744 static void ohci_iso_xmit_task(unsigned long data);
1745
1746 static int ohci_iso_xmit_init(struct hpsb_iso *iso)
1747 {
1748 struct ohci_iso_xmit *xmit;
1749 unsigned int prog_size;
1750 int ctx;
1751 int ret = -ENOMEM;
1752
1753 xmit = kmalloc(sizeof(*xmit), GFP_KERNEL);
1754 if (!xmit)
1755 return -ENOMEM;
1756
1757 iso->hostdata = xmit;
1758 xmit->ohci = iso->host->hostdata;
1759 xmit->task_active = 0;
1760 xmit->last_cycle = -1;
1761 atomic_set(&iso->skips, 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 if (xmit->last_cycle > -1) {
1860 int cycle_diff = cycle - xmit->last_cycle;
1861 int skip;
1862
1863 /* unwrap */
1864 if (cycle_diff < 0) {
1865 cycle_diff += 8000;
1866 if (cycle_diff < 0)
1867 PRINT(KERN_ERR, "bogus cycle diff %d\n",
1868 cycle_diff);
1869 }
1870
1871 skip = cycle_diff - 1;
1872 if (skip > 0) {
1873 DBGMSG("skipped %d cycles without packet loss", skip);
1874 atomic_add(skip, &iso->skips);
1875 }
1876 }
1877 xmit->last_cycle = cycle;
1878
1879 /* tell the subsystem the packet has gone out */
1880 hpsb_iso_packet_sent(iso, cycle, event != 0x11);
1881
1882 /* reset the DMA descriptor for next time */
1883 cmd->output_last.status = 0;
1884 }
1885
1886 if (wake)
1887 hpsb_iso_wake(iso);
1888 }
1889
1890 static int ohci_iso_xmit_queue(struct hpsb_iso *iso, struct hpsb_iso_packet_info *info)
1891 {
1892 struct ohci_iso_xmit *xmit = iso->hostdata;
1893 struct ti_ohci *ohci = xmit->ohci;
1894
1895 int next_i, prev_i;
1896 struct iso_xmit_cmd *next, *prev;
1897
1898 unsigned int offset;
1899 unsigned short len;
1900 unsigned char tag, sy;
1901
1902 /* check that the packet doesn't cross a page boundary
1903 (we could allow this if we added OUTPUT_MORE descriptor support) */
1904 if (cross_bound(info->offset, info->len)) {
1905 PRINT(KERN_ERR,
1906 "rawiso xmit: packet %u crosses a page boundary",
1907 iso->first_packet);
1908 return -EINVAL;
1909 }
1910
1911 offset = info->offset;
1912 len = info->len;
1913 tag = info->tag;
1914 sy = info->sy;
1915
1916 /* sync up the card's view of the buffer */
1917 dma_region_sync_for_device(&iso->data_buf, offset, len);
1918
1919 /* append first_packet to the DMA chain */
1920 /* by linking the previous descriptor to it */
1921 /* (next will become the new end of the DMA chain) */
1922
1923 next_i = iso->first_packet;
1924 prev_i = (next_i == 0) ? (iso->buf_packets - 1) : (next_i - 1);
1925
1926 next = dma_region_i(&xmit->prog, struct iso_xmit_cmd, next_i);
1927 prev = dma_region_i(&xmit->prog, struct iso_xmit_cmd, prev_i);
1928
1929 /* set up the OUTPUT_MORE_IMMEDIATE descriptor */
1930 memset(next, 0, sizeof(struct iso_xmit_cmd));
1931 next->output_more_immediate.control = cpu_to_le32(0x02000008);
1932
1933 /* ISO packet header is embedded in the OUTPUT_MORE_IMMEDIATE */
1934
1935 /* tcode = 0xA, and sy */
1936 next->iso_hdr[0] = 0xA0 | (sy & 0xF);
1937
1938 /* tag and channel number */
1939 next->iso_hdr[1] = (tag << 6) | (iso->channel & 0x3F);
1940
1941 /* transmission speed */
1942 next->iso_hdr[2] = iso->speed & 0x7;
1943
1944 /* payload size */
1945 next->iso_hdr[6] = len & 0xFF;
1946 next->iso_hdr[7] = len >> 8;
1947
1948 /* set up the OUTPUT_LAST */
1949 next->output_last.control = cpu_to_le32(1 << 28);
1950 next->output_last.control |= cpu_to_le32(1 << 27); /* update timeStamp */
1951 next->output_last.control |= cpu_to_le32(3 << 20); /* want interrupt */
1952 next->output_last.control |= cpu_to_le32(3 << 18); /* enable branch */
1953 next->output_last.control |= cpu_to_le32(len);
1954
1955 /* payload bus address */
1956 next->output_last.address = cpu_to_le32(dma_region_offset_to_bus(&iso->data_buf, offset));
1957
1958 /* leave branchAddress at zero for now */
1959
1960 /* re-write the previous DMA descriptor to chain to this one */
1961
1962 /* set prev branch address to point to next (Z=3) */
1963 prev->output_last.branchAddress = cpu_to_le32(
1964 dma_prog_region_offset_to_bus(&xmit->prog, sizeof(struct iso_xmit_cmd) * next_i) | 3);
1965
1966 /*
1967 * Link the skip address to this descriptor itself. This causes a
1968 * context to skip a cycle whenever lost cycles or FIFO overruns occur,
1969 * without dropping the data at that point the application should then
1970 * decide whether this is an error condition or not. Some protocols
1971 * can deal with this by dropping some rate-matching padding packets.
1972 */
1973 next->output_more_immediate.branchAddress =
1974 prev->output_last.branchAddress;
1975
1976 /* disable interrupt, unless required by the IRQ interval */
1977 if (prev_i % iso->irq_interval) {
1978 prev->output_last.control &= cpu_to_le32(~(3 << 20)); /* no interrupt */
1979 } else {
1980 prev->output_last.control |= cpu_to_le32(3 << 20); /* enable interrupt */
1981 }
1982
1983 wmb();
1984
1985 /* wake DMA in case it is sleeping */
1986 reg_write(xmit->ohci, xmit->ContextControlSet, 1 << 12);
1987
1988 /* issue a dummy read of the cycle timer to force all PCI
1989 writes to be posted immediately */
1990 mb();
1991 reg_read(xmit->ohci, OHCI1394_IsochronousCycleTimer);
1992
1993 return 0;
1994 }
1995
1996 static int ohci_iso_xmit_start(struct hpsb_iso *iso, int cycle)
1997 {
1998 struct ohci_iso_xmit *xmit = iso->hostdata;
1999 struct ti_ohci *ohci = xmit->ohci;
2000
2001 /* clear out the control register */
2002 reg_write(xmit->ohci, xmit->ContextControlClear, 0xFFFFFFFF);
2003 wmb();
2004
2005 /* address and length of first descriptor block (Z=3) */
2006 reg_write(xmit->ohci, xmit->CommandPtr,
2007 dma_prog_region_offset_to_bus(&xmit->prog, iso->pkt_dma * sizeof(struct iso_xmit_cmd)) | 3);
2008
2009 /* cycle match */
2010 if (cycle != -1) {
2011 u32 start = cycle & 0x1FFF;
2012
2013 /* 'cycle' is only mod 8000, but we also need two 'seconds' bits -
2014 just snarf them from the current time */
2015 u32 seconds = reg_read(xmit->ohci, OHCI1394_IsochronousCycleTimer) >> 25;
2016
2017 /* advance one second to give some extra time for DMA to start */
2018 seconds += 1;
2019
2020 start |= (seconds & 3) << 13;
2021
2022 reg_write(xmit->ohci, xmit->ContextControlSet, 0x80000000 | (start << 16));
2023 }
2024
2025 /* enable interrupts */
2026 reg_write(xmit->ohci, OHCI1394_IsoXmitIntMaskSet, 1 << xmit->task.context);
2027
2028 /* run */
2029 reg_write(xmit->ohci, xmit->ContextControlSet, 0x8000);
2030 mb();
2031
2032 /* wait 100 usec to give the card time to go active */
2033 udelay(100);
2034
2035 /* check the RUN bit */
2036 if (!(reg_read(xmit->ohci, xmit->ContextControlSet) & 0x8000)) {
2037 PRINT(KERN_ERR, "Error starting IT DMA (ContextControl 0x%08x)\n",
2038 reg_read(xmit->ohci, xmit->ContextControlSet));
2039 return -1;
2040 }
2041
2042 return 0;
2043 }
2044
2045 static int ohci_isoctl(struct hpsb_iso *iso, enum isoctl_cmd cmd, unsigned long arg)
2046 {
2047
2048 switch(cmd) {
2049 case XMIT_INIT:
2050 return ohci_iso_xmit_init(iso);
2051 case XMIT_START:
2052 return ohci_iso_xmit_start(iso, arg);
2053 case XMIT_STOP:
2054 ohci_iso_xmit_stop(iso);
2055 return 0;
2056 case XMIT_QUEUE:
2057 return ohci_iso_xmit_queue(iso, (struct hpsb_iso_packet_info*) arg);
2058 case XMIT_SHUTDOWN:
2059 ohci_iso_xmit_shutdown(iso);
2060 return 0;
2061
2062 case RECV_INIT:
2063 return ohci_iso_recv_init(iso);
2064 case RECV_START: {
2065 int *args = (int*) arg;
2066 return ohci_iso_recv_start(iso, args[0], args[1], args[2]);
2067 }
2068 case RECV_STOP:
2069 ohci_iso_recv_stop(iso);
2070 return 0;
2071 case RECV_RELEASE:
2072 ohci_iso_recv_release(iso, (struct hpsb_iso_packet_info*) arg);
2073 return 0;
2074 case RECV_FLUSH:
2075 ohci_iso_recv_task((unsigned long) iso);
2076 return 0;
2077 case RECV_SHUTDOWN:
2078 ohci_iso_recv_shutdown(iso);
2079 return 0;
2080 case RECV_LISTEN_CHANNEL:
2081 ohci_iso_recv_change_channel(iso, arg, 1);
2082 return 0;
2083 case RECV_UNLISTEN_CHANNEL:
2084 ohci_iso_recv_change_channel(iso, arg, 0);
2085 return 0;
2086 case RECV_SET_CHANNEL_MASK:
2087 ohci_iso_recv_set_channel_mask(iso, *((u64*) arg));
2088 return 0;
2089
2090 default:
2091 PRINT_G(KERN_ERR, "ohci_isoctl cmd %d not implemented yet",
2092 cmd);
2093 break;
2094 }
2095 return -EINVAL;
2096 }
2097
2098 /***************************************
2099 * IEEE-1394 functionality section END *
2100 ***************************************/
2101
2102
2103 /********************************************************
2104 * Global stuff (interrupt handler, init/shutdown code) *
2105 ********************************************************/
2106
2107 static void dma_trm_reset(struct dma_trm_ctx *d)
2108 {
2109 unsigned long flags;
2110 LIST_HEAD(packet_list);
2111 struct ti_ohci *ohci = d->ohci;
2112 struct hpsb_packet *packet, *ptmp;
2113
2114 ohci1394_stop_context(ohci, d->ctrlClear, NULL);
2115
2116 /* Lock the context, reset it and release it. Move the packets
2117 * that were pending in the context to packet_list and free
2118 * them after releasing the lock. */
2119
2120 spin_lock_irqsave(&d->lock, flags);
2121
2122 list_splice_init(&d->fifo_list, &packet_list);
2123 list_splice_init(&d->pending_list, &packet_list);
2124
2125 d->branchAddrPtr = NULL;
2126 d->sent_ind = d->prg_ind;
2127 d->free_prgs = d->num_desc;
2128
2129 spin_unlock_irqrestore(&d->lock, flags);
2130
2131 if (list_empty(&packet_list))
2132 return;
2133
2134 PRINT(KERN_INFO, "AT dma reset ctx=%d, aborting transmission", d->ctx);
2135
2136 /* Now process subsystem callbacks for the packets from this
2137 * context. */
2138 list_for_each_entry_safe(packet, ptmp, &packet_list, driver_list) {
2139 list_del_init(&packet->driver_list);
2140 hpsb_packet_sent(ohci->host, packet, ACKX_ABORTED);
2141 }
2142 }
2143
2144 static void ohci_schedule_iso_tasklets(struct ti_ohci *ohci,
2145 quadlet_t rx_event,
2146 quadlet_t tx_event)
2147 {
2148 struct ohci1394_iso_tasklet *t;
2149 unsigned long mask;
2150 unsigned long flags;
2151
2152 spin_lock_irqsave(&ohci->iso_tasklet_list_lock, flags);
2153
2154 list_for_each_entry(t, &ohci->iso_tasklet_list, link) {
2155 mask = 1 << t->context;
2156
2157 if (t->type == OHCI_ISO_TRANSMIT) {
2158 if (tx_event & mask)
2159 tasklet_schedule(&t->tasklet);
2160 } else {
2161 /* OHCI_ISO_RECEIVE or OHCI_ISO_MULTICHANNEL_RECEIVE */
2162 if (rx_event & mask)
2163 tasklet_schedule(&t->tasklet);
2164 }
2165 }
2166
2167 spin_unlock_irqrestore(&ohci->iso_tasklet_list_lock, flags);
2168 }
2169
2170 static irqreturn_t ohci_irq_handler(int irq, void *dev_id)
2171 {
2172 quadlet_t event, node_id;
2173 struct ti_ohci *ohci = (struct ti_ohci *)dev_id;
2174 struct hpsb_host *host = ohci->host;
2175 int phyid = -1, isroot = 0;
2176 unsigned long flags;
2177
2178 /* Read and clear the interrupt event register. Don't clear
2179 * the busReset event, though. This is done when we get the
2180 * selfIDComplete interrupt. */
2181 spin_lock_irqsave(&ohci->event_lock, flags);
2182 event = reg_read(ohci, OHCI1394_IntEventClear);
2183 reg_write(ohci, OHCI1394_IntEventClear, event & ~OHCI1394_busReset);
2184 spin_unlock_irqrestore(&ohci->event_lock, flags);
2185
2186 if (!event)
2187 return IRQ_NONE;
2188
2189 /* If event is ~(u32)0 cardbus card was ejected. In this case
2190 * we just return, and clean up in the ohci1394_pci_remove
2191 * function. */
2192 if (event == ~(u32) 0) {
2193 DBGMSG("Device removed.");
2194 return IRQ_NONE;
2195 }
2196
2197 DBGMSG("IntEvent: %08x", event);
2198
2199 if (event & OHCI1394_unrecoverableError) {
2200 int ctx;
2201 PRINT(KERN_ERR, "Unrecoverable error!");
2202
2203 if (reg_read(ohci, OHCI1394_AsReqTrContextControlSet) & 0x800)
2204 PRINT(KERN_ERR, "Async Req Tx Context died: "
2205 "ctrl[%08x] cmdptr[%08x]",
2206 reg_read(ohci, OHCI1394_AsReqTrContextControlSet),
2207 reg_read(ohci, OHCI1394_AsReqTrCommandPtr));
2208
2209 if (reg_read(ohci, OHCI1394_AsRspTrContextControlSet) & 0x800)
2210 PRINT(KERN_ERR, "Async Rsp Tx Context died: "
2211 "ctrl[%08x] cmdptr[%08x]",
2212 reg_read(ohci, OHCI1394_AsRspTrContextControlSet),
2213 reg_read(ohci, OHCI1394_AsRspTrCommandPtr));
2214
2215 if (reg_read(ohci, OHCI1394_AsReqRcvContextControlSet) & 0x800)
2216 PRINT(KERN_ERR, "Async Req Rcv Context died: "
2217 "ctrl[%08x] cmdptr[%08x]",
2218 reg_read(ohci, OHCI1394_AsReqRcvContextControlSet),
2219 reg_read(ohci, OHCI1394_AsReqRcvCommandPtr));
2220
2221 if (reg_read(ohci, OHCI1394_AsRspRcvContextControlSet) & 0x800)
2222 PRINT(KERN_ERR, "Async Rsp Rcv Context died: "
2223 "ctrl[%08x] cmdptr[%08x]",
2224 reg_read(ohci, OHCI1394_AsRspRcvContextControlSet),
2225 reg_read(ohci, OHCI1394_AsRspRcvCommandPtr));
2226
2227 for (ctx = 0; ctx < ohci->nb_iso_xmit_ctx; ctx++) {
2228 if (reg_read(ohci, OHCI1394_IsoXmitContextControlSet + (16 * ctx)) & 0x800)
2229 PRINT(KERN_ERR, "Iso Xmit %d Context died: "
2230 "ctrl[%08x] cmdptr[%08x]", ctx,
2231 reg_read(ohci, OHCI1394_IsoXmitContextControlSet + (16 * ctx)),
2232 reg_read(ohci, OHCI1394_IsoXmitCommandPtr + (16 * ctx)));
2233 }
2234
2235 for (ctx = 0; ctx < ohci->nb_iso_rcv_ctx; ctx++) {
2236 if (reg_read(ohci, OHCI1394_IsoRcvContextControlSet + (32 * ctx)) & 0x800)
2237 PRINT(KERN_ERR, "Iso Recv %d Context died: "
2238 "ctrl[%08x] cmdptr[%08x] match[%08x]", ctx,
2239 reg_read(ohci, OHCI1394_IsoRcvContextControlSet + (32 * ctx)),
2240 reg_read(ohci, OHCI1394_IsoRcvCommandPtr + (32 * ctx)),
2241 reg_read(ohci, OHCI1394_IsoRcvContextMatch + (32 * ctx)));
2242 }
2243
2244 event &= ~OHCI1394_unrecoverableError;
2245 }
2246 if (event & OHCI1394_postedWriteErr) {
2247 PRINT(KERN_ERR, "physical posted write error");
2248 /* no recovery strategy yet, had to involve protocol drivers */
2249 event &= ~OHCI1394_postedWriteErr;
2250 }
2251 if (event & OHCI1394_cycleTooLong) {
2252 if(printk_ratelimit())
2253 PRINT(KERN_WARNING, "isochronous cycle too long");
2254 else
2255 DBGMSG("OHCI1394_cycleTooLong");
2256 reg_write(ohci, OHCI1394_LinkControlSet,
2257 OHCI1394_LinkControl_CycleMaster);
2258 event &= ~OHCI1394_cycleTooLong;
2259 }
2260 if (event & OHCI1394_cycleInconsistent) {
2261 /* We subscribe to the cycleInconsistent event only to
2262 * clear the corresponding event bit... otherwise,
2263 * isochronous cycleMatch DMA won't work. */
2264 DBGMSG("OHCI1394_cycleInconsistent");
2265 event &= ~OHCI1394_cycleInconsistent;
2266 }
2267 if (event & OHCI1394_busReset) {
2268 /* The busReset event bit can't be cleared during the
2269 * selfID phase, so we disable busReset interrupts, to
2270 * avoid burying the cpu in interrupt requests. */
2271 spin_lock_irqsave(&ohci->event_lock, flags);
2272 reg_write(ohci, OHCI1394_IntMaskClear, OHCI1394_busReset);
2273
2274 if (ohci->check_busreset) {
2275 int loop_count = 0;
2276
2277 udelay(10);
2278
2279 while (reg_read(ohci, OHCI1394_IntEventSet) & OHCI1394_busReset) {
2280 reg_write(ohci, OHCI1394_IntEventClear, OHCI1394_busReset);
2281
2282 spin_unlock_irqrestore(&ohci->event_lock, flags);
2283 udelay(10);
2284 spin_lock_irqsave(&ohci->event_lock, flags);
2285
2286 /* The loop counter check is to prevent the driver
2287 * from remaining in this state forever. For the
2288 * initial bus reset, the loop continues for ever
2289 * and the system hangs, until some device is plugged-in
2290 * or out manually into a port! The forced reset seems
2291 * to solve this problem. This mainly effects nForce2. */
2292 if (loop_count > 10000) {
2293 ohci_devctl(host, RESET_BUS, LONG_RESET);
2294 DBGMSG("Detected bus-reset loop. Forced a bus reset!");
2295 loop_count = 0;
2296 }
2297
2298 loop_count++;
2299 }
2300 }
2301 spin_unlock_irqrestore(&ohci->event_lock, flags);
2302 if (!host->in_bus_reset) {
2303 DBGMSG("irq_handler: Bus reset requested");
2304
2305 /* Subsystem call */
2306 hpsb_bus_reset(ohci->host);
2307 }
2308 event &= ~OHCI1394_busReset;
2309 }
2310 if (event & OHCI1394_reqTxComplete) {
2311 struct dma_trm_ctx *d = &ohci->at_req_context;
2312 DBGMSG("Got reqTxComplete interrupt "
2313 "status=0x%08X", reg_read(ohci, d->ctrlSet));
2314 if (reg_read(ohci, d->ctrlSet) & 0x800)
2315 ohci1394_stop_context(ohci, d->ctrlClear,
2316 "reqTxComplete");
2317 else
2318 dma_trm_tasklet((unsigned long)d);
2319 //tasklet_schedule(&d->task);
2320 event &= ~OHCI1394_reqTxComplete;
2321 }
2322 if (event & OHCI1394_respTxComplete) {
2323 struct dma_trm_ctx *d = &ohci->at_resp_context;
2324 DBGMSG("Got respTxComplete interrupt "
2325 "status=0x%08X", reg_read(ohci, d->ctrlSet));
2326 if (reg_read(ohci, d->ctrlSet) & 0x800)
2327 ohci1394_stop_context(ohci, d->ctrlClear,
2328 "respTxComplete");
2329 else
2330 tasklet_schedule(&d->task);
2331 event &= ~OHCI1394_respTxComplete;
2332 }
2333 if (event & OHCI1394_RQPkt) {
2334 struct dma_rcv_ctx *d = &ohci->ar_req_context;
2335 DBGMSG("Got RQPkt interrupt status=0x%08X",
2336 reg_read(ohci, d->ctrlSet));
2337 if (reg_read(ohci, d->ctrlSet) & 0x800)
2338 ohci1394_stop_context(ohci, d->ctrlClear, "RQPkt");
2339 else
2340 tasklet_schedule(&d->task);
2341 event &= ~OHCI1394_RQPkt;
2342 }
2343 if (event & OHCI1394_RSPkt) {
2344 struct dma_rcv_ctx *d = &ohci->ar_resp_context;
2345 DBGMSG("Got RSPkt interrupt status=0x%08X",
2346 reg_read(ohci, d->ctrlSet));
2347 if (reg_read(ohci, d->ctrlSet) & 0x800)
2348 ohci1394_stop_context(ohci, d->ctrlClear, "RSPkt");
2349 else
2350 tasklet_schedule(&d->task);
2351 event &= ~OHCI1394_RSPkt;
2352 }
2353 if (event & OHCI1394_isochRx) {
2354 quadlet_t rx_event;
2355
2356 rx_event = reg_read(ohci, OHCI1394_IsoRecvIntEventSet);
2357 reg_write(ohci, OHCI1394_IsoRecvIntEventClear, rx_event);
2358 ohci_schedule_iso_tasklets(ohci, rx_event, 0);
2359 event &= ~OHCI1394_isochRx;
2360 }
2361 if (event & OHCI1394_isochTx) {
2362 quadlet_t tx_event;
2363
2364 tx_event = reg_read(ohci, OHCI1394_IsoXmitIntEventSet);
2365 reg_write(ohci, OHCI1394_IsoXmitIntEventClear, tx_event);
2366 ohci_schedule_iso_tasklets(ohci, 0, tx_event);
2367 event &= ~OHCI1394_isochTx;
2368 }
2369 if (event & OHCI1394_selfIDComplete) {
2370 if (host->in_bus_reset) {
2371 node_id = reg_read(ohci, OHCI1394_NodeID);
2372
2373 if (!(node_id & 0x80000000)) {
2374 PRINT(KERN_ERR,
2375 "SelfID received, but NodeID invalid "
2376 "(probably new bus reset occurred): %08X",
2377 node_id);
2378 goto selfid_not_valid;
2379 }
2380
2381 phyid = node_id & 0x0000003f;
2382 isroot = (node_id & 0x40000000) != 0;
2383
2384 DBGMSG("SelfID interrupt received "
2385 "(phyid %d, %s)", phyid,
2386 (isroot ? "root" : "not root"));
2387
2388 handle_selfid(ohci, host, phyid, isroot);
2389
2390 /* Clear the bus reset event and re-enable the
2391 * busReset interrupt. */
2392 spin_lock_irqsave(&ohci->event_lock, flags);
2393 reg_write(ohci, OHCI1394_IntEventClear, OHCI1394_busReset);
2394 reg_write(ohci, OHCI1394_IntMaskSet, OHCI1394_busReset);
2395 spin_unlock_irqrestore(&ohci->event_lock, flags);
2396
2397 /* Turn on phys dma reception.
2398 *
2399 * TODO: Enable some sort of filtering management.
2400 */
2401 if (phys_dma) {
2402 reg_write(ohci, OHCI1394_PhyReqFilterHiSet,
2403 0xffffffff);
2404 reg_write(ohci, OHCI1394_PhyReqFilterLoSet,
2405 0xffffffff);
2406 }
2407
2408 DBGMSG("PhyReqFilter=%08x%08x",
2409 reg_read(ohci, OHCI1394_PhyReqFilterHiSet),
2410 reg_read(ohci, OHCI1394_PhyReqFilterLoSet));
2411
2412 hpsb_selfid_complete(host, phyid, isroot);
2413 } else
2414 PRINT(KERN_ERR,
2415 "SelfID received outside of bus reset sequence");
2416
2417 selfid_not_valid:
2418 event &= ~OHCI1394_selfIDComplete;
2419 }
2420
2421 /* Make sure we handle everything, just in case we accidentally
2422 * enabled an interrupt that we didn't write a handler for. */
2423 if (event)
2424 PRINT(KERN_ERR, "Unhandled interrupt(s) 0x%08x",
2425 event);
2426
2427 return IRQ_HANDLED;
2428 }
2429
2430 /* Put the buffer back into the dma context */
2431 static void insert_dma_buffer(struct dma_rcv_ctx *d, int idx)
2432 {
2433 struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
2434 DBGMSG("Inserting dma buf ctx=%d idx=%d", d->ctx, idx);
2435
2436 d->prg_cpu[idx]->status = cpu_to_le32(d->buf_size);
2437 d->prg_cpu[idx]->branchAddress &= le32_to_cpu(0xfffffff0);
2438 idx = (idx + d->num_desc - 1 ) % d->num_desc;
2439 d->prg_cpu[idx]->branchAddress |= le32_to_cpu(0x00000001);
2440
2441 /* To avoid a race, ensure 1394 interface hardware sees the inserted
2442 * context program descriptors before it sees the wakeup bit set. */
2443 wmb();
2444
2445 /* wake up the dma context if necessary */
2446 if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
2447 PRINT(KERN_INFO,
2448 "Waking dma ctx=%d ... processing is probably too slow",
2449 d->ctx);
2450 }
2451
2452 /* do this always, to avoid race condition */
2453 reg_write(ohci, d->ctrlSet, 0x1000);
2454 }
2455
2456 #define cond_le32_to_cpu(data, noswap) \
2457 (noswap ? data : le32_to_cpu(data))
2458
2459 static const int TCODE_SIZE[16] = {20, 0, 16, -1, 16, 20, 20, 0,
2460 -1, 0, -1, 0, -1, -1, 16, -1};
2461
2462 /*
2463 * Determine the length of a packet in the buffer
2464 * Optimization suggested by Pascal Drolet <pascal.drolet@informission.ca>
2465 */
2466 static inline int packet_length(struct dma_rcv_ctx *d, int idx,
2467 quadlet_t *buf_ptr, int offset,
2468 unsigned char tcode, int noswap)
2469 {
2470 int length = -1;
2471
2472 if (d->type == DMA_CTX_ASYNC_REQ || d->type == DMA_CTX_ASYNC_RESP) {
2473 length = TCODE_SIZE[tcode];
2474 if (length == 0) {
2475 if (offset + 12 >= d->buf_size) {
2476 length = (cond_le32_to_cpu(d->buf_cpu[(idx + 1) % d->num_desc]
2477 [3 - ((d->buf_size - offset) >> 2)], noswap) >> 16);
2478 } else {
2479 length = (cond_le32_to_cpu(buf_ptr[3], noswap) >> 16);
2480 }
2481 length += 20;
2482 }
2483 } else if (d->type == DMA_CTX_ISO) {
2484 /* Assumption: buffer fill mode with header/trailer */
2485 length = (cond_le32_to_cpu(buf_ptr[0], noswap) >> 16) + 8;
2486 }
2487
2488 if (length > 0 && length % 4)
2489 length += 4 - (length % 4);
2490
2491 return length;
2492 }
2493
2494 /* Tasklet that processes dma receive buffers */
2495 static void dma_rcv_tasklet (unsigned long data)
2496 {
2497 struct dma_rcv_ctx *d = (struct dma_rcv_ctx*)data;
2498 struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
2499 unsigned int split_left, idx, offset, rescount;
2500 unsigned char tcode;
2501 int length, bytes_left, ack;
2502 unsigned long flags;
2503 quadlet_t *buf_ptr;
2504 char *split_ptr;
2505 char msg[256];
2506
2507 spin_lock_irqsave(&d->lock, flags);
2508
2509 idx = d->buf_ind;
2510 offset = d->buf_offset;
2511 buf_ptr = d->buf_cpu[idx] + offset/4;
2512
2513 rescount = le32_to_cpu(d->prg_cpu[idx]->status) & 0xffff;
2514 bytes_left = d->buf_size - rescount - offset;
2515
2516 while (bytes_left > 0) {
2517 tcode = (cond_le32_to_cpu(buf_ptr[0], ohci->no_swap_incoming) >> 4) & 0xf;
2518
2519 /* packet_length() will return < 4 for an error */
2520 length = packet_length(d, idx, buf_ptr, offset, tcode, ohci->no_swap_incoming);
2521
2522 if (length < 4) { /* something is wrong */
2523 sprintf(msg,"Unexpected tcode 0x%x(0x%08x) in AR ctx=%d, length=%d",
2524 tcode, cond_le32_to_cpu(buf_ptr[0], ohci->no_swap_incoming),
2525 d->ctx, length);
2526 ohci1394_stop_context(ohci, d->ctrlClear, msg);
2527 spin_unlock_irqrestore(&d->lock, flags);
2528 return;
2529 }
2530
2531 /* The first case is where we have a packet that crosses
2532 * over more than one descriptor. The next case is where
2533 * it's all in the first descriptor. */
2534 if ((offset + length) > d->buf_size) {
2535 DBGMSG("Split packet rcv'd");
2536 if (length > d->split_buf_size) {
2537 ohci1394_stop_context(ohci, d->ctrlClear,
2538 "Split packet size exceeded");
2539 d->buf_ind = idx;
2540 d->buf_offset = offset;
2541 spin_unlock_irqrestore(&d->lock, flags);
2542 return;
2543 }
2544
2545 if (le32_to_cpu(d->prg_cpu[(idx+1)%d->num_desc]->status)
2546 == d->buf_size) {
2547 /* Other part of packet not written yet.
2548 * this should never happen I think
2549 * anyway we'll get it on the next call. */
2550 PRINT(KERN_INFO,
2551 "Got only half a packet!");
2552 d->buf_ind = idx;
2553 d->buf_offset = offset;
2554 spin_unlock_irqrestore(&d->lock, flags);
2555 return;
2556 }
2557
2558 split_left = length;
2559 split_ptr = (char *)d->spb;
2560 memcpy(split_ptr,buf_ptr,d->buf_size-offset);
2561 split_left -= d->buf_size-offset;
2562 split_ptr += d->buf_size-offset;
2563 insert_dma_buffer(d, idx);
2564 idx = (idx+1) % d->num_desc;
2565 buf_ptr = d->buf_cpu[idx];
2566 offset=0;
2567
2568 while (split_left >= d->buf_size) {
2569 memcpy(split_ptr,buf_ptr,d->buf_size);
2570 split_ptr += d->buf_size;
2571 split_left -= d->buf_size;
2572 insert_dma_buffer(d, idx);
2573 idx = (idx+1) % d->num_desc;
2574 buf_ptr = d->buf_cpu[idx];
2575 }
2576
2577 if (split_left > 0) {
2578 memcpy(split_ptr, buf_ptr, split_left);
2579 offset = split_left;
2580 buf_ptr += offset/4;
2581 }
2582 } else {
2583 DBGMSG("Single packet rcv'd");
2584 memcpy(d->spb, buf_ptr, length);
2585 offset += length;
2586 buf_ptr += length/4;
2587 if (offset==d->buf_size) {
2588 insert_dma_buffer(d, idx);
2589 idx = (idx+1) % d->num_desc;
2590 buf_ptr = d->buf_cpu[idx];
2591 offset=0;
2592 }
2593 }
2594
2595 /* We get one phy packet to the async descriptor for each
2596 * bus reset. We always ignore it. */
2597 if (tcode != OHCI1394_TCODE_PHY) {
2598 if (!ohci->no_swap_incoming)
2599 header_le32_to_cpu(d->spb, tcode);
2600 DBGMSG("Packet received from node"
2601 " %d ack=0x%02X spd=%d tcode=0x%X"
2602 " length=%d ctx=%d tlabel=%d",
2603 (d->spb[1]>>16)&0x3f,
2604 (cond_le32_to_cpu(d->spb[length/4-1], ohci->no_swap_incoming)>>16)&0x1f,
2605 (cond_le32_to_cpu(d->spb[length/4-1], ohci->no_swap_incoming)>>21)&0x3,
2606 tcode, length, d->ctx,
2607 (d->spb[0]>>10)&0x3f);
2608
2609 ack = (((cond_le32_to_cpu(d->spb[length/4-1], ohci->no_swap_incoming)>>16)&0x1f)
2610 == 0x11) ? 1 : 0;
2611
2612 hpsb_packet_received(ohci->host, d->spb,
2613 length-4, ack);
2614 }
2615 #ifdef OHCI1394_DEBUG
2616 else
2617 PRINT (KERN_DEBUG, "Got phy packet ctx=%d ... discarded",
2618 d->ctx);
2619 #endif
2620
2621 rescount = le32_to_cpu(d->prg_cpu[idx]->status) & 0xffff;
2622
2623 bytes_left = d->buf_size - rescount - offset;
2624
2625 }
2626
2627 d->buf_ind = idx;
2628 d->buf_offset = offset;
2629
2630 spin_unlock_irqrestore(&d->lock, flags);
2631 }
2632
2633 /* Bottom half that processes sent packets */
2634 static void dma_trm_tasklet (unsigned long data)
2635 {
2636 struct dma_trm_ctx *d = (struct dma_trm_ctx*)data;
2637 struct ti_ohci *ohci = (struct ti_ohci*)(d->ohci);
2638 struct hpsb_packet *packet, *ptmp;
2639 unsigned long flags;
2640 u32 status, ack;
2641 size_t datasize;
2642
2643 spin_lock_irqsave(&d->lock, flags);
2644
2645 list_for_each_entry_safe(packet, ptmp, &d->fifo_list, driver_list) {
2646 datasize = packet->data_size;
2647 if (datasize && packet->type != hpsb_raw)
2648 status = le32_to_cpu(
2649 d->prg_cpu[d->sent_ind]->end.status) >> 16;
2650 else
2651 status = le32_to_cpu(
2652 d->prg_cpu[d->sent_ind]->begin.status) >> 16;
2653
2654 if (status == 0)
2655 /* this packet hasn't been sent yet*/
2656 break;
2657
2658 #ifdef OHCI1394_DEBUG
2659 if (datasize)
2660 if (((le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>4)&0xf) == 0xa)
2661 DBGMSG("Stream packet sent to channel %d tcode=0x%X "
2662 "ack=0x%X spd=%d dataLength=%d ctx=%d",
2663 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>8)&0x3f,
2664 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>4)&0xf,
2665 status&0x1f, (status>>5)&0x3,
2666 le32_to_cpu(d->prg_cpu[d->sent_ind]->data[1])>>16,
2667 d->ctx);
2668 else
2669 DBGMSG("Packet sent to node %d tcode=0x%X tLabel="
2670 "%d ack=0x%X spd=%d dataLength=%d ctx=%d",
2671 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[1])>>16)&0x3f,
2672 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>4)&0xf,
2673 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])>>10)&0x3f,
2674 status&0x1f, (status>>5)&0x3,
2675 le32_to_cpu(d->prg_cpu[d->sent_ind]->data[3])>>16,
2676 d->ctx);
2677 else
2678 DBGMSG("Packet sent to node %d tcode=0x%X tLabel="
2679 "%d ack=0x%X spd=%d data=0x%08X ctx=%d",
2680 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[1])
2681 >>16)&0x3f,
2682 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])
2683 >>4)&0xf,
2684 (le32_to_cpu(d->prg_cpu[d->sent_ind]->data[0])
2685 >>10)&0x3f,
2686 status&0x1f, (status>>5)&0x3,
2687 le32_to_cpu(d->prg_cpu[d->sent_ind]->data[3]),
2688 d->ctx);
2689 #endif
2690
2691 if (status & 0x10) {
2692 ack = status & 0xf;
2693 } else {
2694 switch (status & 0x1f) {
2695 case EVT_NO_STATUS: /* that should never happen */
2696 case EVT_RESERVED_A: /* that should never happen */
2697 case EVT_LONG_PACKET: /* that should never happen */
2698 PRINT(KERN_WARNING, "Received OHCI evt_* error 0x%x", status & 0x1f);
2699 ack = ACKX_SEND_ERROR;
2700 break;
2701 case EVT_MISSING_ACK:
2702 ack = ACKX_TIMEOUT;
2703 break;
2704 case EVT_UNDERRUN:
2705 ack = ACKX_SEND_ERROR;
2706 break;
2707 case EVT_OVERRUN: /* that should never happen */
2708 PRINT(KERN_WARNING, "Received OHCI evt_* error 0x%x", status & 0x1f);
2709 ack = ACKX_SEND_ERROR;
2710 break;
2711 case EVT_DESCRIPTOR_READ:
2712 case EVT_DATA_READ:
2713 case EVT_DATA_WRITE:
2714 ack = ACKX_SEND_ERROR;
2715 break;
2716 case EVT_BUS_RESET: /* that should never happen */
2717 PRINT(KERN_WARNING, "Received OHCI evt_* error 0x%x", status & 0x1f);
2718 ack = ACKX_SEND_ERROR;
2719 break;
2720 case EVT_TIMEOUT:
2721 ack = ACKX_TIMEOUT;
2722 break;
2723 case EVT_TCODE_ERR:
2724 ack = ACKX_SEND_ERROR;
2725 break;
2726 case EVT_RESERVED_B: /* that should never happen */
2727 case EVT_RESERVED_C: /* that should never happen */
2728 PRINT(KERN_WARNING, "Received OHCI evt_* error 0x%x", status & 0x1f);
2729 ack = ACKX_SEND_ERROR;
2730 break;
2731 case EVT_UNKNOWN:
2732 case EVT_FLUSHED:
2733 ack = ACKX_SEND_ERROR;
2734 break;
2735 default:
2736 PRINT(KERN_ERR, "Unhandled OHCI evt_* error 0x%x", status & 0x1f);
2737 ack = ACKX_SEND_ERROR;
2738 BUG();
2739 }
2740 }
2741
2742 list_del_init(&packet->driver_list);
2743 hpsb_packet_sent(ohci->host, packet, ack);
2744
2745 if (datasize)
2746 pci_unmap_single(ohci->dev,
2747 cpu_to_le32(d->prg_cpu[d->sent_ind]->end.address),
2748 datasize, PCI_DMA_TODEVICE);
2749
2750 d->sent_ind = (d->sent_ind+1)%d->num_desc;
2751 d->free_prgs++;
2752 }
2753
2754 dma_trm_flush(ohci, d);
2755
2756 spin_unlock_irqrestore(&d->lock, flags);
2757 }
2758
2759 static void free_dma_rcv_ctx(struct dma_rcv_ctx *d)
2760 {
2761 int i;
2762 struct ti_ohci *ohci = d->ohci;
2763
2764 if (ohci == NULL)
2765 return;
2766
2767 DBGMSG("Freeing dma_rcv_ctx %d", d->ctx);
2768
2769 if (d->buf_cpu) {
2770 for (i=0; i<d->num_desc; i++)
2771 if (d->buf_cpu[i] && d->buf_bus[i])
2772 pci_free_consistent(
2773 ohci->dev, d->buf_size,
2774 d->buf_cpu[i], d->buf_bus[i]);
2775 kfree(d->buf_cpu);
2776 kfree(d->buf_bus);
2777 }
2778 if (d->prg_cpu) {
2779 for (i=0; i<d->num_desc; i++)
2780 if (d->prg_cpu[i] && d->prg_bus[i])
2781 pci_pool_free(d->prg_pool, d->prg_cpu[i],
2782 d->prg_bus[i]);
2783 pci_pool_destroy(d->prg_pool);
2784 kfree(d->prg_cpu);
2785 kfree(d->prg_bus);
2786 }
2787 kfree(d->spb);
2788
2789 /* Mark this context as freed. */
2790 d->ohci = NULL;
2791 }
2792
2793 static int
2794 alloc_dma_rcv_ctx(struct ti_ohci *ohci, struct dma_rcv_ctx *d,
2795 enum context_type type, int ctx, int num_desc,
2796 int buf_size, int split_buf_size, int context_base)
2797 {
2798 int i, len;
2799 static int num_allocs;
2800 static char pool_name[20];
2801
2802 d->ohci = ohci;
2803 d->type = type;
2804 d->ctx = ctx;
2805
2806 d->num_desc = num_desc;
2807 d->buf_size = buf_size;
2808 d->split_buf_size = split_buf_size;
2809
2810 d->ctrlSet = 0;
2811 d->ctrlClear = 0;
2812 d->cmdPtr = 0;
2813
2814 d->buf_cpu = kzalloc(d->num_desc * sizeof(*d->buf_cpu), GFP_ATOMIC);
2815 d->buf_bus = kzalloc(d->num_desc * sizeof(*d->buf_bus), GFP_ATOMIC);
2816
2817 if (d->buf_cpu == NULL || d->buf_bus == NULL) {
2818 PRINT(KERN_ERR, "Failed to allocate %s", "DMA buffer");
2819 free_dma_rcv_ctx(d);
2820 return -ENOMEM;
2821 }
2822
2823 d->prg_cpu = kzalloc(d->num_desc * sizeof(*d->prg_cpu), GFP_ATOMIC);
2824 d->prg_bus = kzalloc(d->num_desc * sizeof(*d->prg_bus), GFP_ATOMIC);
2825
2826 if (d->prg_cpu == NULL || d->prg_bus == NULL) {
2827 PRINT(KERN_ERR, "Failed to allocate %s", "DMA prg");
2828 free_dma_rcv_ctx(d);
2829 return -ENOMEM;
2830 }
2831
2832 d->spb = kmalloc(d->split_buf_size, GFP_ATOMIC);
2833
2834 if (d->spb == NULL) {
2835 PRINT(KERN_ERR, "Failed to allocate %s", "split buffer");
2836 free_dma_rcv_ctx(d);
2837 return -ENOMEM;
2838 }
2839
2840 len = sprintf(pool_name, "ohci1394_rcv_prg");
2841 sprintf(pool_name+len, "%d", num_allocs);
2842 d->prg_pool = pci_pool_create(pool_name, ohci->dev,
2843 sizeof(struct dma_cmd), 4, 0);
2844 if(d->prg_pool == NULL)
2845 {
2846 PRINT(KERN_ERR, "pci_pool_create failed for %s", pool_name);
2847 free_dma_rcv_ctx(d);
2848 return -ENOMEM;
2849 }
2850 num_allocs++;
2851
2852 for (i=0; i<d->num_desc; i++) {
2853 d->buf_cpu[i] = pci_alloc_consistent(ohci->dev,
2854 d->buf_size,
2855 d->buf_bus+i);
2856
2857 if (d->buf_cpu[i] != NULL) {
2858 memset(d->buf_cpu[i], 0, d->buf_size);
2859 } else {
2860 PRINT(KERN_ERR,
2861 "Failed to allocate %s", "DMA buffer");
2862 free_dma_rcv_ctx(d);
2863 return -ENOMEM;
2864 }
2865
2866 d->prg_cpu[i] = pci_pool_alloc(d->prg_pool, GFP_KERNEL, d->prg_bus+i);
2867
2868 if (d->prg_cpu[i] != NULL) {
2869 memset(d->prg_cpu[i], 0, sizeof(struct dma_cmd));
2870 } else {
2871 PRINT(KERN_ERR,
2872 "Failed to allocate %s", "DMA prg");
2873 free_dma_rcv_ctx(d);
2874 return -ENOMEM;
2875 }
2876 }
2877
2878 spin_lock_init(&d->lock);
2879
2880 d->ctrlSet = context_base + OHCI1394_ContextControlSet;
2881 d->ctrlClear = context_base + OHCI1394_ContextControlClear;
2882 d->cmdPtr = context_base + OHCI1394_ContextCommandPtr;
2883
2884 tasklet_init(&d->task, dma_rcv_tasklet, (unsigned long) d);
2885 return 0;
2886 }
2887
2888 static void free_dma_trm_ctx(struct dma_trm_ctx *d)
2889 {
2890 int i;
2891 struct ti_ohci *ohci = d->ohci;
2892
2893 if (ohci == NULL)
2894 return;
2895
2896 DBGMSG("Freeing dma_trm_ctx %d", d->ctx);
2897
2898 if (d->prg_cpu) {
2899 for (i=0; i<d->num_desc; i++)
2900 if (d->prg_cpu[i] && d->prg_bus[i])
2901 pci_pool_free(d->prg_pool, d->prg_cpu[i],
2902 d->prg_bus[i]);
2903 pci_pool_destroy(d->prg_pool);
2904 kfree(d->prg_cpu);
2905 kfree(d->prg_bus);
2906 }
2907
2908 /* Mark this context as freed. */
2909 d->ohci = NULL;
2910 }
2911
2912 static int
2913 alloc_dma_trm_ctx(struct ti_ohci *ohci, struct dma_trm_ctx *d,
2914 enum context_type type, int ctx, int num_desc,
2915 int context_base)
2916 {
2917 int i, len;
2918 static char pool_name[20];
2919 static int num_allocs=0;
2920
2921 d->ohci = ohci;
2922 d->type = type;
2923 d->ctx = ctx;
2924 d->num_desc = num_desc;
2925 d->ctrlSet = 0;
2926 d->ctrlClear = 0;
2927 d->cmdPtr = 0;
2928
2929 d->prg_cpu = kzalloc(d->num_desc * sizeof(*d->prg_cpu), GFP_KERNEL);
2930 d->prg_bus = kzalloc(d->num_desc * sizeof(*d->prg_bus), GFP_KERNEL);
2931
2932 if (d->prg_cpu == NULL || d->prg_bus == NULL) {
2933 PRINT(KERN_ERR, "Failed to allocate %s", "AT DMA prg");
2934 free_dma_trm_ctx(d);
2935 return -ENOMEM;
2936 }
2937
2938 len = sprintf(pool_name, "ohci1394_trm_prg");
2939 sprintf(pool_name+len, "%d", num_allocs);
2940 d->prg_pool = pci_pool_create(pool_name, ohci->dev,
2941 sizeof(struct at_dma_prg), 4, 0);
2942 if (d->prg_pool == NULL) {
2943 PRINT(KERN_ERR, "pci_pool_create failed for %s", pool_name);
2944 free_dma_trm_ctx(d);
2945 return -ENOMEM;
2946 }
2947 num_allocs++;
2948
2949 for (i = 0; i < d->num_desc; i++) {
2950 d->prg_cpu[i] = pci_pool_alloc(d->prg_pool, GFP_KERNEL, d->prg_bus+i);
2951
2952 if (d->prg_cpu[i] != NULL) {
2953 memset(d->prg_cpu[i], 0, sizeof(struct at_dma_prg));
2954 } else {
2955 PRINT(KERN_ERR,
2956 "Failed to allocate %s", "AT DMA prg");
2957 free_dma_trm_ctx(d);
2958 return -ENOMEM;
2959 }
2960 }
2961
2962 spin_lock_init(&d->lock);
2963
2964 /* initialize tasklet */
2965 d->ctrlSet = context_base + OHCI1394_ContextControlSet;
2966 d->ctrlClear = context_base + OHCI1394_ContextControlClear;
2967 d->cmdPtr = context_base + OHCI1394_ContextCommandPtr;
2968 tasklet_init(&d->task, dma_trm_tasklet, (unsigned long)d);
2969 return 0;
2970 }
2971
2972 static void ohci_set_hw_config_rom(struct hpsb_host *host, __be32 *config_rom)
2973 {
2974 struct ti_ohci *ohci = host->hostdata;
2975
2976 reg_write(ohci, OHCI1394_ConfigROMhdr, be32_to_cpu(config_rom[0]));
2977 reg_write(ohci, OHCI1394_BusOptions, be32_to_cpu(config_rom[2]));
2978
2979 memcpy(ohci->csr_config_rom_cpu, config_rom, OHCI_CONFIG_ROM_LEN);
2980 }
2981
2982
2983 static quadlet_t ohci_hw_csr_reg(struct hpsb_host *host, int reg,
2984 quadlet_t data, quadlet_t compare)
2985 {
2986 struct ti_ohci *ohci = host->hostdata;
2987 int i;
2988
2989 reg_write(ohci, OHCI1394_CSRData, data);
2990 reg_write(ohci, OHCI1394_CSRCompareData, compare);
2991 reg_write(ohci, OHCI1394_CSRControl, reg & 0x3);
2992
2993 for (i = 0; i < OHCI_LOOP_COUNT; i++) {
2994 if (reg_read(ohci, OHCI1394_CSRControl) & 0x80000000)
2995 break;
2996
2997 mdelay(1);
2998 }
2999
3000 return reg_read(ohci, OHCI1394_CSRData);
3001 }
3002
3003 static struct hpsb_host_driver ohci1394_driver = {
3004 .owner = THIS_MODULE,
3005 .name = OHCI1394_DRIVER_NAME,
3006 .set_hw_config_rom = ohci_set_hw_config_rom,
3007 .transmit_packet = ohci_transmit,
3008 .devctl = ohci_devctl,
3009 .isoctl = ohci_isoctl,
3010 .hw_csr_reg = ohci_hw_csr_reg,
3011 };
3012
3013 /***********************************
3014 * PCI Driver Interface functions *
3015 ***********************************/
3016
3017 #ifdef CONFIG_PPC_PMAC
3018 static void ohci1394_pmac_on(struct pci_dev *dev)
3019 {
3020 if (machine_is(powermac)) {
3021 struct device_node *ofn = pci_device_to_OF_node(dev);
3022
3023 if (ofn) {
3024 pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, ofn, 0, 1);
3025 pmac_call_feature(PMAC_FTR_1394_ENABLE, ofn, 0, 1);
3026 }
3027 }
3028 }
3029
3030 static void ohci1394_pmac_off(struct pci_dev *dev)
3031 {
3032 if (machine_is(powermac)) {
3033 struct device_node *ofn = pci_device_to_OF_node(dev);
3034
3035 if (ofn) {
3036 pmac_call_feature(PMAC_FTR_1394_ENABLE, ofn, 0, 0);
3037 pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, ofn, 0, 0);
3038 }
3039 }
3040 }
3041 #else
3042 #define ohci1394_pmac_on(dev)
3043 #define ohci1394_pmac_off(dev)
3044 #endif /* CONFIG_PPC_PMAC */
3045
3046 static int __devinit ohci1394_pci_probe(struct pci_dev *dev,
3047 const struct pci_device_id *ent)
3048 {
3049 struct hpsb_host *host;
3050 struct ti_ohci *ohci; /* shortcut to currently handled device */
3051 resource_size_t ohci_base;
3052 int err = -ENOMEM;
3053
3054 ohci1394_pmac_on(dev);
3055 if (pci_enable_device(dev)) {
3056 PRINT_G(KERN_ERR, "Failed to enable OHCI hardware");
3057 err = -ENXIO;
3058 goto err;
3059 }
3060 pci_set_master(dev);
3061
3062 host = hpsb_alloc_host(&ohci1394_driver, sizeof(struct ti_ohci), &dev->dev);
3063 if (!host) {
3064 PRINT_G(KERN_ERR, "Failed to allocate %s", "host structure");
3065 goto err;
3066 }
3067 ohci = host->hostdata;
3068 ohci->dev = dev;
3069 ohci->host = host;
3070 ohci->init_state = OHCI_INIT_ALLOC_HOST;
3071 host->pdev = dev;
3072 pci_set_drvdata(dev, ohci);
3073
3074 /* We don't want hardware swapping */
3075 pci_write_config_dword(dev, OHCI1394_PCI_HCI_Control, 0);
3076
3077 /* Some oddball Apple controllers do not order the selfid
3078 * properly, so we make up for it here. */
3079 #ifndef __LITTLE_ENDIAN
3080 /* XXX: Need a better way to check this. I'm wondering if we can
3081 * read the values of the OHCI1394_PCI_HCI_Control and the
3082 * noByteSwapData registers to see if they were not cleared to
3083 * zero. Should this work? Obviously it's not defined what these
3084 * registers will read when they aren't supported. Bleh! */
3085 if (dev->vendor == PCI_VENDOR_ID_APPLE &&
3086 dev->device == PCI_DEVICE_ID_APPLE_UNI_N_FW) {
3087 ohci->no_swap_incoming = 1;
3088 ohci->selfid_swap = 0;
3089 } else
3090 ohci->selfid_swap = 1;
3091 #endif
3092
3093
3094 #ifndef PCI_DEVICE_ID_NVIDIA_NFORCE2_FW
3095 #define PCI_DEVICE_ID_NVIDIA_NFORCE2_FW 0x006e
3096 #endif
3097
3098 /* These chipsets require a bit of extra care when checking after
3099 * a busreset. */
3100 if ((dev->vendor == PCI_VENDOR_ID_APPLE &&
3101 dev->device == PCI_DEVICE_ID_APPLE_UNI_N_FW) ||
3102 (dev->vendor == PCI_VENDOR_ID_NVIDIA &&
3103 dev->device == PCI_DEVICE_ID_NVIDIA_NFORCE2_FW))
3104 ohci->check_busreset = 1;
3105
3106 /* We hardwire the MMIO length, since some CardBus adaptors
3107 * fail to report the right length. Anyway, the ohci spec
3108 * clearly says it's 2kb, so this shouldn't be a problem. */
3109 ohci_base = pci_resource_start(dev, 0);
3110 if (pci_resource_len(dev, 0) < OHCI1394_REGISTER_SIZE)
3111 PRINT(KERN_WARNING, "PCI resource length of 0x%llx too small!",
3112 (unsigned long long)pci_resource_len(dev, 0));
3113
3114 if (!request_mem_region(ohci_base, OHCI1394_REGISTER_SIZE,
3115 OHCI1394_DRIVER_NAME)) {
3116 PRINT_G(KERN_ERR, "MMIO resource (0x%llx - 0x%llx) unavailable",
3117 (unsigned long long)ohci_base,
3118 (unsigned long long)ohci_base + OHCI1394_REGISTER_SIZE);
3119 goto err;
3120 }
3121 ohci->init_state = OHCI_INIT_HAVE_MEM_REGION;
3122
3123 ohci->registers = ioremap(ohci_base, OHCI1394_REGISTER_SIZE);
3124 if (ohci->registers == NULL) {
3125 PRINT_G(KERN_ERR, "Failed to remap registers");
3126 err = -ENXIO;
3127 goto err;
3128 }
3129 ohci->init_state = OHCI_INIT_HAVE_IOMAPPING;
3130 DBGMSG("Remapped memory spaces reg 0x%p", ohci->registers);
3131
3132 /* csr_config rom allocation */
3133 ohci->csr_config_rom_cpu =
3134 pci_alloc_consistent(ohci->dev, OHCI_CONFIG_ROM_LEN,
3135 &ohci->csr_config_rom_bus);
3136 if (ohci->csr_config_rom_cpu == NULL) {
3137 PRINT_G(KERN_ERR, "Failed to allocate %s", "buffer config rom");
3138 goto err;
3139 }
3140 ohci->init_state = OHCI_INIT_HAVE_CONFIG_ROM_BUFFER;
3141
3142 /* self-id dma buffer allocation */
3143 ohci->selfid_buf_cpu =
3144 pci_alloc_consistent(ohci->dev, OHCI1394_SI_DMA_BUF_SIZE,
3145 &ohci->selfid_buf_bus);
3146 if (ohci->selfid_buf_cpu == NULL) {
3147 PRINT_G(KERN_ERR, "Failed to allocate %s", "self-ID buffer");
3148 goto err;
3149 }
3150 ohci->init_state = OHCI_INIT_HAVE_SELFID_BUFFER;
3151
3152 if ((unsigned long)ohci->selfid_buf_cpu & 0x1fff)
3153 PRINT(KERN_INFO, "SelfID buffer %p is not aligned on "
3154 "8Kb boundary... may cause problems on some CXD3222 chip",
3155 ohci->selfid_buf_cpu);
3156
3157 /* No self-id errors at startup */
3158 ohci->self_id_errors = 0;
3159
3160 ohci->init_state = OHCI_INIT_HAVE_TXRX_BUFFERS__MAYBE;
3161 /* AR DMA request context allocation */
3162 if (alloc_dma_rcv_ctx(ohci, &ohci->ar_req_context,
3163 DMA_CTX_ASYNC_REQ, 0, AR_REQ_NUM_DESC,
3164 AR_REQ_BUF_SIZE, AR_REQ_SPLIT_BUF_SIZE,
3165 OHCI1394_AsReqRcvContextBase) < 0) {
3166 PRINT_G(KERN_ERR, "Failed to allocate %s", "AR Req context");
3167 goto err;
3168 }
3169 /* AR DMA response context allocation */
3170 if (alloc_dma_rcv_ctx(ohci, &ohci->ar_resp_context,
3171 DMA_CTX_ASYNC_RESP, 0, AR_RESP_NUM_DESC,
3172 AR_RESP_BUF_SIZE, AR_RESP_SPLIT_BUF_SIZE,
3173 OHCI1394_AsRspRcvContextBase) < 0) {
3174 PRINT_G(KERN_ERR, "Failed to allocate %s", "AR Resp context");
3175 goto err;
3176 }
3177 /* AT DMA request context */
3178 if (alloc_dma_trm_ctx(ohci, &ohci->at_req_context,
3179 DMA_CTX_ASYNC_REQ, 0, AT_REQ_NUM_DESC,
3180 OHCI1394_AsReqTrContextBase) < 0) {
3181 PRINT_G(KERN_ERR, "Failed to allocate %s", "AT Req context");
3182 goto err;
3183 }
3184 /* AT DMA response context */
3185 if (alloc_dma_trm_ctx(ohci, &ohci->at_resp_context,
3186 DMA_CTX_ASYNC_RESP, 1, AT_RESP_NUM_DESC,
3187 OHCI1394_AsRspTrContextBase) < 0) {
3188 PRINT_G(KERN_ERR, "Failed to allocate %s", "AT Resp context");
3189 goto err;
3190 }
3191 /* Start off with a soft reset, to clear everything to a sane
3192 * state. */
3193 ohci_soft_reset(ohci);
3194
3195 /* Now enable LPS, which we need in order to start accessing
3196 * most of the registers. In fact, on some cards (ALI M5251),
3197 * accessing registers in the SClk domain without LPS enabled
3198 * will lock up the machine. */
3199 reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_LPS);
3200
3201 /* Disable and clear interrupts */
3202 reg_write(ohci, OHCI1394_IntEventClear, 0xffffffff);
3203 reg_write(ohci, OHCI1394_IntMaskClear, 0xffffffff);
3204
3205 /* Flush MMIO writes and wait to make sure we have full link enabled. */
3206 reg_read(ohci, OHCI1394_Version);
3207 msleep(50);
3208
3209 /* Determine the number of available IR and IT contexts. */
3210 ohci->nb_iso_rcv_ctx =
3211 get_nb_iso_ctx(ohci, OHCI1394_IsoRecvIntMaskSet);
3212 ohci->nb_iso_xmit_ctx =
3213 get_nb_iso_ctx(ohci, OHCI1394_IsoXmitIntMaskSet);
3214
3215 /* Set the usage bits for non-existent contexts so they can't
3216 * be allocated */
3217 ohci->ir_ctx_usage = ~0 << ohci->nb_iso_rcv_ctx;
3218 ohci->it_ctx_usage = ~0 << ohci->nb_iso_xmit_ctx;
3219
3220 INIT_LIST_HEAD(&ohci->iso_tasklet_list);
3221 spin_lock_init(&ohci->iso_tasklet_list_lock);
3222 ohci->ISO_channel_usage = 0;
3223 spin_lock_init(&ohci->IR_channel_lock);
3224
3225 spin_lock_init(&ohci->event_lock);
3226
3227 /*
3228 * interrupts are disabled, all right, but... due to IRQF_SHARED we
3229 * might get called anyway. We'll see no event, of course, but
3230 * we need to get to that "no event", so enough should be initialized
3231 * by that point.
3232 */
3233 err = request_irq(dev->irq, ohci_irq_handler, IRQF_SHARED,
3234 OHCI1394_DRIVER_NAME, ohci);
3235 if (err) {
3236 PRINT_G(KERN_ERR, "Failed to allocate interrupt %d", dev->irq);
3237 goto err;
3238 }
3239 ohci->init_state = OHCI_INIT_HAVE_IRQ;
3240 ohci_initialize(ohci);
3241
3242 /* Set certain csr values */
3243 host->csr.guid_hi = reg_read(ohci, OHCI1394_GUIDHi);
3244 host->csr.guid_lo = reg_read(ohci, OHCI1394_GUIDLo);
3245 host->csr.cyc_clk_acc = 100; /* how do we determine clk accuracy? */
3246 host->csr.max_rec = (reg_read(ohci, OHCI1394_BusOptions) >> 12) & 0xf;
3247 host->csr.lnk_spd = reg_read(ohci, OHCI1394_BusOptions) & 0x7;
3248
3249 if (phys_dma) {
3250 host->low_addr_space =
3251 (u64) reg_read(ohci, OHCI1394_PhyUpperBound) << 16;
3252 if (!host->low_addr_space)
3253 host->low_addr_space = OHCI1394_PHYS_UPPER_BOUND_FIXED;
3254 }
3255 host->middle_addr_space = OHCI1394_MIDDLE_ADDRESS_SPACE;
3256
3257 /* Tell the highlevel this host is ready */
3258 if (hpsb_add_host(host)) {
3259 PRINT_G(KERN_ERR, "Failed to register host with highlevel");
3260 goto err;
3261 }
3262 ohci->init_state = OHCI_INIT_DONE;
3263
3264 return 0;
3265 err:
3266 ohci1394_pci_remove(dev);
3267 return err;
3268 }
3269
3270 static void ohci1394_pci_remove(struct pci_dev *dev)
3271 {
3272 struct ti_ohci *ohci;
3273 struct device *device;
3274
3275 ohci = pci_get_drvdata(dev);
3276 if (!ohci)
3277 goto out;
3278
3279 device = get_device(&ohci->host->device);
3280
3281 switch (ohci->init_state) {
3282 case OHCI_INIT_DONE:
3283 hpsb_remove_host(ohci->host);
3284
3285 /* Clear out BUS Options */
3286 reg_write(ohci, OHCI1394_ConfigROMhdr, 0);
3287 reg_write(ohci, OHCI1394_BusOptions,
3288 (reg_read(ohci, OHCI1394_BusOptions) & 0x0000f007) |
3289 0x00ff0000);
3290 memset(ohci->csr_config_rom_cpu, 0, OHCI_CONFIG_ROM_LEN);
3291
3292 case OHCI_INIT_HAVE_IRQ:
3293 /* Clear interrupt registers */
3294 reg_write(ohci, OHCI1394_IntMaskClear, 0xffffffff);
3295 reg_write(ohci, OHCI1394_IntEventClear, 0xffffffff);
3296 reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, 0xffffffff);
3297 reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 0xffffffff);
3298 reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, 0xffffffff);
3299 reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 0xffffffff);
3300
3301 /* Disable IRM Contender */
3302 set_phy_reg(ohci, 4, ~0xc0 & get_phy_reg(ohci, 4));
3303
3304 /* Clear link control register */
3305 reg_write(ohci, OHCI1394_LinkControlClear, 0xffffffff);
3306
3307 /* Let all other nodes know to ignore us */
3308 ohci_devctl(ohci->host, RESET_BUS, LONG_RESET_NO_FORCE_ROOT);
3309
3310 /* Soft reset before we start - this disables
3311 * interrupts and clears linkEnable and LPS. */
3312 ohci_soft_reset(ohci);
3313 free_irq(dev->irq, ohci);
3314
3315 case OHCI_INIT_HAVE_TXRX_BUFFERS__MAYBE:
3316 /* The ohci_soft_reset() stops all DMA contexts, so we
3317 * dont need to do this. */
3318 free_dma_rcv_ctx(&ohci->ar_req_context);
3319 free_dma_rcv_ctx(&ohci->ar_resp_context);
3320 free_dma_trm_ctx(&ohci->at_req_context);
3321 free_dma_trm_ctx(&ohci->at_resp_context);
3322
3323 case OHCI_INIT_HAVE_SELFID_BUFFER:
3324 pci_free_consistent(dev, OHCI1394_SI_DMA_BUF_SIZE,
3325 ohci->selfid_buf_cpu,
3326 ohci->selfid_buf_bus);
3327
3328 case OHCI_INIT_HAVE_CONFIG_ROM_BUFFER:
3329 pci_free_consistent(dev, OHCI_CONFIG_ROM_LEN,
3330 ohci->csr_config_rom_cpu,
3331 ohci->csr_config_rom_bus);
3332
3333 case OHCI_INIT_HAVE_IOMAPPING:
3334 iounmap(ohci->registers);
3335
3336 case OHCI_INIT_HAVE_MEM_REGION:
3337 release_mem_region(pci_resource_start(dev, 0),
3338 OHCI1394_REGISTER_SIZE);
3339
3340 case OHCI_INIT_ALLOC_HOST:
3341 pci_set_drvdata(dev, NULL);
3342 }
3343
3344 if (device)
3345 put_device(device);
3346 out:
3347 ohci1394_pmac_off(dev);
3348 }
3349
3350 #ifdef CONFIG_PM
3351 static int ohci1394_pci_suspend(struct pci_dev *dev, pm_message_t state)
3352 {
3353 int err;
3354 struct ti_ohci *ohci = pci_get_drvdata(dev);
3355
3356 if (!ohci) {
3357 printk(KERN_ERR "%s: tried to suspend nonexisting host\n",
3358 OHCI1394_DRIVER_NAME);
3359 return -ENXIO;
3360 }
3361 DBGMSG("suspend called");
3362
3363 /* Clear the async DMA contexts and stop using the controller */
3364 hpsb_bus_reset(ohci->host);
3365
3366 /* See ohci1394_pci_remove() for comments on this sequence */
3367 reg_write(ohci, OHCI1394_ConfigROMhdr, 0);
3368 reg_write(ohci, OHCI1394_BusOptions,
3369 (reg_read(ohci, OHCI1394_BusOptions) & 0x0000f007) |
3370 0x00ff0000);
3371 reg_write(ohci, OHCI1394_IntMaskClear, 0xffffffff);
3372 reg_write(ohci, OHCI1394_IntEventClear, 0xffffffff);
3373 reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, 0xffffffff);
3374 reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 0xffffffff);
3375 reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, 0xffffffff);
3376 reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 0xffffffff);
3377 set_phy_reg(ohci, 4, ~0xc0 & get_phy_reg(ohci, 4));
3378 reg_write(ohci, OHCI1394_LinkControlClear, 0xffffffff);
3379 ohci_devctl(ohci->host, RESET_BUS, LONG_RESET_NO_FORCE_ROOT);
3380 ohci_soft_reset(ohci);
3381
3382 free_irq(dev->irq, ohci);
3383 err = pci_save_state(dev);
3384 if (err) {
3385 PRINT(KERN_ERR, "pci_save_state failed with %d", err);
3386 return err;
3387 }
3388 err = pci_set_power_state(dev, pci_choose_state(dev, state));
3389 if (err)
3390 DBGMSG("pci_set_power_state failed with %d", err);
3391 ohci1394_pmac_off(dev);
3392
3393 return 0;
3394 }
3395
3396 static int ohci1394_pci_resume(struct pci_dev *dev)
3397 {
3398 int err;
3399 struct ti_ohci *ohci = pci_get_drvdata(dev);
3400
3401 if (!ohci) {
3402 printk(KERN_ERR "%s: tried to resume nonexisting host\n",
3403 OHCI1394_DRIVER_NAME);
3404 return -ENXIO;
3405 }
3406 DBGMSG("resume called");
3407
3408 ohci1394_pmac_on(dev);
3409 pci_set_power_state(dev, PCI_D0);
3410 pci_restore_state(dev);
3411 err = pci_enable_device(dev);
3412 if (err) {
3413 PRINT(KERN_ERR, "pci_enable_device failed with %d", err);
3414 return err;
3415 }
3416
3417 /* See ohci1394_pci_probe() for comments on this sequence */
3418 ohci_soft_reset(ohci);
3419 reg_write(ohci, OHCI1394_HCControlSet, OHCI1394_HCControl_LPS);
3420 reg_write(ohci, OHCI1394_IntEventClear, 0xffffffff);
3421 reg_write(ohci, OHCI1394_IntMaskClear, 0xffffffff);
3422 reg_read(ohci, OHCI1394_Version);
3423 msleep(50);
3424
3425 err = request_irq(dev->irq, ohci_irq_handler, IRQF_SHARED,
3426 OHCI1394_DRIVER_NAME, ohci);
3427 if (err) {
3428 PRINT_G(KERN_ERR, "Failed to allocate interrupt %d", dev->irq);
3429 return err;
3430 }
3431
3432 ohci_initialize(ohci);
3433
3434 hpsb_resume_host(ohci->host);
3435 return 0;
3436 }
3437 #endif /* CONFIG_PM */
3438
3439 static struct pci_device_id ohci1394_pci_tbl[] = {
3440 {
3441 .class = PCI_CLASS_SERIAL_FIREWIRE_OHCI,
3442 .class_mask = PCI_ANY_ID,
3443 .vendor = PCI_ANY_ID,
3444 .device = PCI_ANY_ID,
3445 .subvendor = PCI_ANY_ID,
3446 .subdevice = PCI_ANY_ID,
3447 },
3448 { 0, },
3449 };
3450
3451 MODULE_DEVICE_TABLE(pci, ohci1394_pci_tbl);
3452
3453 static struct pci_driver ohci1394_pci_driver = {
3454 .name = OHCI1394_DRIVER_NAME,
3455 .id_table = ohci1394_pci_tbl,
3456 .probe = ohci1394_pci_probe,
3457 .remove = ohci1394_pci_remove,
3458 #ifdef CONFIG_PM
3459 .resume = ohci1394_pci_resume,
3460 .suspend = ohci1394_pci_suspend,
3461 #endif
3462 };
3463
3464 /***********************************
3465 * OHCI1394 Video Interface *
3466 ***********************************/
3467
3468 /* essentially the only purpose of this code is to allow another
3469 module to hook into ohci's interrupt handler */
3470
3471 /* returns zero if successful, one if DMA context is locked up */
3472 int ohci1394_stop_context(struct ti_ohci *ohci, int reg, char *msg)
3473 {
3474 int i=0;
3475
3476 /* stop the channel program if it's still running */
3477 reg_write(ohci, reg, 0x8000);
3478
3479 /* Wait until it effectively stops */
3480 while (reg_read(ohci, reg) & 0x400) {
3481 i++;
3482 if (i>5000) {
3483 PRINT(KERN_ERR,
3484 "Runaway loop while stopping context: %s...", msg ? msg : "");
3485 return 1;
3486 }
3487
3488 mb();
3489 udelay(10);
3490 }
3491 if (msg) PRINT(KERN_ERR, "%s: dma prg stopped", msg);
3492 return 0;
3493 }
3494
3495 void ohci1394_init_iso_tasklet(struct ohci1394_iso_tasklet *tasklet, int type,
3496 void (*func)(unsigned long), unsigned long data)
3497 {
3498 tasklet_init(&tasklet->tasklet, func, data);
3499 tasklet->type = type;
3500 /* We init the tasklet->link field, so we can list_del() it
3501 * without worrying whether it was added to the list or not. */
3502 INIT_LIST_HEAD(&tasklet->link);
3503 }
3504
3505 int ohci1394_register_iso_tasklet(struct ti_ohci *ohci,
3506 struct ohci1394_iso_tasklet *tasklet)
3507 {
3508 unsigned long flags, *usage;
3509 int n, i, r = -EBUSY;
3510
3511 if (tasklet->type == OHCI_ISO_TRANSMIT) {
3512 n = ohci->nb_iso_xmit_ctx;
3513 usage = &ohci->it_ctx_usage;
3514 }
3515 else {
3516 n = ohci->nb_iso_rcv_ctx;
3517 usage = &ohci->ir_ctx_usage;
3518
3519 /* only one receive context can be multichannel (OHCI sec 10.4.1) */
3520 if (tasklet->type == OHCI_ISO_MULTICHANNEL_RECEIVE) {
3521 if (test_and_set_bit(0, &ohci->ir_multichannel_used)) {
3522 return r;
3523 }
3524 }
3525 }
3526
3527 spin_lock_irqsave(&ohci->iso_tasklet_list_lock, flags);
3528
3529 for (i = 0; i < n; i++)
3530 if (!test_and_set_bit(i, usage)) {
3531 tasklet->context = i;
3532 list_add_tail(&tasklet->link, &ohci->iso_tasklet_list);
3533 r = 0;
3534 break;
3535 }
3536
3537 spin_unlock_irqrestore(&ohci->iso_tasklet_list_lock, flags);
3538
3539 return r;
3540 }
3541
3542 void ohci1394_unregister_iso_tasklet(struct ti_ohci *ohci,
3543 struct ohci1394_iso_tasklet *tasklet)
3544 {
3545 unsigned long flags;
3546
3547 tasklet_kill(&tasklet->tasklet);
3548
3549 spin_lock_irqsave(&ohci->iso_tasklet_list_lock, flags);
3550
3551 if (tasklet->type == OHCI_ISO_TRANSMIT)
3552 clear_bit(tasklet->context, &ohci->it_ctx_usage);
3553 else {
3554 clear_bit(tasklet->context, &ohci->ir_ctx_usage);
3555
3556 if (tasklet->type == OHCI_ISO_MULTICHANNEL_RECEIVE) {
3557 clear_bit(0, &ohci->ir_multichannel_used);
3558 }
3559 }
3560
3561 list_del(&tasklet->link);
3562
3563 spin_unlock_irqrestore(&ohci->iso_tasklet_list_lock, flags);
3564 }
3565
3566 EXPORT_SYMBOL(ohci1394_stop_context);
3567 EXPORT_SYMBOL(ohci1394_init_iso_tasklet);
3568 EXPORT_SYMBOL(ohci1394_register_iso_tasklet);
3569 EXPORT_SYMBOL(ohci1394_unregister_iso_tasklet);
3570
3571 /***********************************
3572 * General module initialization *
3573 ***********************************/
3574
3575 MODULE_AUTHOR("Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>");
3576 MODULE_DESCRIPTION("Driver for PCI OHCI IEEE-1394 controllers");
3577 MODULE_LICENSE("GPL");
3578
3579 static void __exit ohci1394_cleanup (void)
3580 {
3581 pci_unregister_driver(&ohci1394_pci_driver);
3582 }
3583
3584 static int __init ohci1394_init(void)
3585 {
3586 return pci_register_driver(&ohci1394_pci_driver);
3587 }
3588
3589 module_init(ohci1394_init);
3590 module_exit(ohci1394_cleanup);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree