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Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6
[linux-2.6-block.git] / drivers / ieee1394 / csr.c
CommitLineData
1da177e4
LT		 1/*
2 * IEEE 1394 for Linux
3 *
4 * CSR implementation, iso/bus manager implementation.
5 *
6 * Copyright (C) 1999 Andreas E. Bombe
7 * 2002 Manfred Weihs <weihs@ict.tuwien.ac.at>
8 *
9 * This code is licensed under the GPL. See the file COPYING in the root
10 * directory of the kernel sources for details.
11 *
12 *
13 * Contributions:
14 *
15 * Manfred Weihs <weihs@ict.tuwien.ac.at>
16 * configuration ROM manipulation
17 *
18 */
19
f0cbefe6
SR		 20#include <linux/jiffies.h>
21#include <linux/kernel.h>
1da177e4
LT		 22#include <linux/module.h>
23#include <linux/moduleparam.h>
24#include <linux/param.h>
25#include <linux/spinlock.h>
f0cbefe6 26#include <linux/string.h>
1da177e4
LT		 27
28#include "csr1212.h"
29#include "ieee1394_types.h"
30#include "hosts.h"
31#include "ieee1394.h"
32#include "highlevel.h"
1934b8b6 33#include "ieee1394_core.h"
1da177e4
LT		 34
35/* Module Parameters */
36/* this module parameter can be used to disable mapping of the FCP registers */
37
38static int fcp = 1;
39module_param(fcp, int, 0444);
40MODULE_PARM_DESC(fcp, "Map FCP registers (default = 1, disable = 0).");
41
42static struct csr1212_keyval *node_cap = NULL;
43
44static void add_host(struct hpsb_host *host);
45static void remove_host(struct hpsb_host *host);
46static void host_reset(struct hpsb_host *host);
47static int read_maps(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
48 u64 addr, size_t length, u16 fl);
49static int write_fcp(struct hpsb_host *host, int nodeid, int dest,
50 quadlet_t *data, u64 addr, size_t length, u16 flags);
51static int read_regs(struct hpsb_host *host, int nodeid, quadlet_t *buf,
52 u64 addr, size_t length, u16 flags);
53static int write_regs(struct hpsb_host *host, int nodeid, int destid,
54 quadlet_t *data, u64 addr, size_t length, u16 flags);
55static int lock_regs(struct hpsb_host *host, int nodeid, quadlet_t *store,
56 u64 addr, quadlet_t data, quadlet_t arg, int extcode, u16 fl);
57static int lock64_regs(struct hpsb_host *host, int nodeid, octlet_t * store,
58 u64 addr, octlet_t data, octlet_t arg, int extcode, u16 fl);
59static int read_config_rom(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
60 u64 addr, size_t length, u16 fl);
61static u64 allocate_addr_range(u64 size, u32 alignment, void *__host);
62static void release_addr_range(u64 addr, void *__host);
63
64static struct hpsb_highlevel csr_highlevel = {
65 .name = "standard registers",
66 .add_host = add_host,
67 .remove_host = remove_host,
68 .host_reset = host_reset,
69};
70
1c4fb577 71static const struct hpsb_address_ops map_ops = {
1da177e4
LT		 72 .read = read_maps,
73};
74
1c4fb577 75static const struct hpsb_address_ops fcp_ops = {
1da177e4
LT		 76 .write = write_fcp,
77};
78
1c4fb577 79static const struct hpsb_address_ops reg_ops = {
1da177e4
LT		 80 .read = read_regs,
81 .write = write_regs,
82 .lock = lock_regs,
83 .lock64 = lock64_regs,
84};
85
1c4fb577 86static const struct hpsb_address_ops config_rom_ops = {
1da177e4
LT		 87 .read = read_config_rom,
88};
89
90struct csr1212_bus_ops csr_bus_ops = {
91 .allocate_addr_range = allocate_addr_range,
92 .release_addr = release_addr_range,
93};
94
95
96static u16 csr_crc16(unsigned *data, int length)
97{
98 int check=0, i;
99 int shift, sum, next=0;
100
101 for (i = length; i; i--) {
102 for (next = check, shift = 28; shift >= 0; shift -= 4 ) {
103 sum = ((next >> 12) ^ (be32_to_cpu(*data) >> shift)) & 0xf;
104 next = (next << 4) ^ (sum << 12) ^ (sum << 5) ^ (sum);
105 }
106 check = next & 0xffff;
107 data++;
108 }
109
110 return check;
111}
112
113static void host_reset(struct hpsb_host *host)
114{
115 host->csr.state &= 0x300;
116
117 host->csr.bus_manager_id = 0x3f;
118 host->csr.bandwidth_available = 4915;
119 host->csr.channels_available_hi = 0xfffffffe; /* pre-alloc ch 31 per 1394a-2000 */
120 host->csr.channels_available_lo = ~0;
121 host->csr.broadcast_channel = 0x80000000 | 31;
122
123 if (host->is_irm) {
124 if (host->driver->hw_csr_reg) {
125 host->driver->hw_csr_reg(host, 2, 0xfffffffe, ~0);
126 }
127 }
128
129 host->csr.node_ids = host->node_id << 16;
130
131 if (!host->is_root) {
132 /* clear cmstr bit */
133 host->csr.state &= ~0x100;
134 }
135
63995d46 136 be32_add_cpu(&host->csr.topology_map[1], 1);
1da177e4
LT		 137 host->csr.topology_map[2] = cpu_to_be32(host->node_count << 16
138 | host->selfid_count);
139 host->csr.topology_map[0] =
140 cpu_to_be32((host->selfid_count + 2) << 16
141 | csr_crc16(host->csr.topology_map + 1,
142 host->selfid_count + 2));
143
63995d46 144 be32_add_cpu(&host->csr.speed_map[1], 1);
1da177e4
LT		 145 host->csr.speed_map[0] = cpu_to_be32(0x3f1 << 16
146 | csr_crc16(host->csr.speed_map+1,
147 0x3f1));
148}
149
150/*
151 * HI == seconds (bits 0:2)
f0cbefe6 152 * LO == fractions of a second in units of 125usec (bits 19:31)
1da177e4 153 *
f0cbefe6
SR		 154 * Convert SPLIT_TIMEOUT to jiffies.
155 * The default and minimum as per 1394a-2000 clause 8.3.2.2.6 is 100ms.
1da177e4
LT		 156 */
157static inline void calculate_expire(struct csr_control *csr)
158{
b63d4fe9
SR		 159 unsigned int usecs = (csr->split_timeout_hi & 7) * 1000000 +
160 (csr->split_timeout_lo >> 19) * 125;
1da177e4 161
b63d4fe9 162 csr->expire = usecs_to_jiffies(usecs > 100000 ? usecs : 100000);
1da177e4
LT		 163 HPSB_VERBOSE("CSR: setting expire to %lu, HZ=%u", csr->expire, HZ);
164}
165
166
167static void add_host(struct hpsb_host *host)
168{
169 struct csr1212_keyval *root;
170 quadlet_t bus_info[CSR_BUS_INFO_SIZE];
171
172 hpsb_register_addrspace(&csr_highlevel, host, &reg_ops,
173 CSR_REGISTER_BASE,
174 CSR_REGISTER_BASE + CSR_CONFIG_ROM);
175 hpsb_register_addrspace(&csr_highlevel, host, &config_rom_ops,
176 CSR_REGISTER_BASE + CSR_CONFIG_ROM,
177 CSR_REGISTER_BASE + CSR_CONFIG_ROM_END);
178 if (fcp) {
179 hpsb_register_addrspace(&csr_highlevel, host, &fcp_ops,
180 CSR_REGISTER_BASE + CSR_FCP_COMMAND,
181 CSR_REGISTER_BASE + CSR_FCP_END);
182 }
183 hpsb_register_addrspace(&csr_highlevel, host, &map_ops,
184 CSR_REGISTER_BASE + CSR_TOPOLOGY_MAP,
185 CSR_REGISTER_BASE + CSR_TOPOLOGY_MAP_END);
186 hpsb_register_addrspace(&csr_highlevel, host, &map_ops,
187 CSR_REGISTER_BASE + CSR_SPEED_MAP,
188 CSR_REGISTER_BASE + CSR_SPEED_MAP_END);
189
190 spin_lock_init(&host->csr.lock);
191
192 host->csr.state = 0;
193 host->csr.node_ids = 0;
194 host->csr.split_timeout_hi = 0;
195 host->csr.split_timeout_lo = 800 << 19;
196 calculate_expire(&host->csr);
197 host->csr.cycle_time = 0;
198 host->csr.bus_time = 0;
199 host->csr.bus_manager_id = 0x3f;
200 host->csr.bandwidth_available = 4915;
201 host->csr.channels_available_hi = 0xfffffffe; /* pre-alloc ch 31 per 1394a-2000 */
202 host->csr.channels_available_lo = ~0;
203 host->csr.broadcast_channel = 0x80000000 | 31;
204
205 if (host->is_irm) {
206 if (host->driver->hw_csr_reg) {
207 host->driver->hw_csr_reg(host, 2, 0xfffffffe, ~0);
208 }
209 }
210
211 if (host->csr.max_rec >= 9)
212 host->csr.max_rom = 2;
213 else if (host->csr.max_rec >= 5)
214 host->csr.max_rom = 1;
215 else
216 host->csr.max_rom = 0;
217
218 host->csr.generation = 2;
219
c1fc58d6 220 bus_info[1] = IEEE1394_BUSID_MAGIC;
1934b8b6 221 bus_info[2] = cpu_to_be32((hpsb_disable_irm ? 0 : 1 << CSR_IRMC_SHIFT) |
1da177e4
LT		 222 (1 << CSR_CMC_SHIFT) |
223 (1 << CSR_ISC_SHIFT) |
224 (0 << CSR_BMC_SHIFT) |
225 (0 << CSR_PMC_SHIFT) |
226 (host->csr.cyc_clk_acc << CSR_CYC_CLK_ACC_SHIFT) |
227 (host->csr.max_rec << CSR_MAX_REC_SHIFT) |
228 (host->csr.max_rom << CSR_MAX_ROM_SHIFT) |
229 (host->csr.generation << CSR_GENERATION_SHIFT) |
230 host->csr.lnk_spd);
231
232 bus_info[3] = cpu_to_be32(host->csr.guid_hi);
233 bus_info[4] = cpu_to_be32(host->csr.guid_lo);
234
235 /* The hardware copy of the bus info block will be set later when a
236 * bus reset is issued. */
237
238 csr1212_init_local_csr(host->csr.rom, bus_info, host->csr.max_rom);
239
240 root = host->csr.rom->root_kv;
241
242 if(csr1212_attach_keyval_to_directory(root, node_cap) != CSR1212_SUCCESS) {
243 HPSB_ERR("Failed to attach Node Capabilities to root directory");
244 }
245
246 host->update_config_rom = 1;
247}
248
249static void remove_host(struct hpsb_host *host)
250{
251 quadlet_t bus_info[CSR_BUS_INFO_SIZE];
252
c1fc58d6 253 bus_info[1] = IEEE1394_BUSID_MAGIC;
1da177e4
LT		 254 bus_info[2] = cpu_to_be32((0 << CSR_IRMC_SHIFT) |
255 (0 << CSR_CMC_SHIFT) |
256 (0 << CSR_ISC_SHIFT) |
257 (0 << CSR_BMC_SHIFT) |
258 (0 << CSR_PMC_SHIFT) |
259 (host->csr.cyc_clk_acc << CSR_CYC_CLK_ACC_SHIFT) |
260 (host->csr.max_rec << CSR_MAX_REC_SHIFT) |
261 (0 << CSR_MAX_ROM_SHIFT) |
262 (0 << CSR_GENERATION_SHIFT) |
263 host->csr.lnk_spd);
264
265 bus_info[3] = cpu_to_be32(host->csr.guid_hi);
266 bus_info[4] = cpu_to_be32(host->csr.guid_lo);
267
268 csr1212_detach_keyval_from_directory(host->csr.rom->root_kv, node_cap);
269
270 csr1212_init_local_csr(host->csr.rom, bus_info, 0);
271 host->update_config_rom = 1;
272}
273
274
275int hpsb_update_config_rom(struct hpsb_host *host, const quadlet_t *new_rom,
276 size_t buffersize, unsigned char rom_version)
277{
278 unsigned long flags;
279 int ret;
280
281 HPSB_NOTICE("hpsb_update_config_rom() is deprecated");
282
283 spin_lock_irqsave(&host->csr.lock, flags);
284 if (rom_version != host->csr.generation)
285 ret = -1;
286 else if (buffersize > host->csr.rom->cache_head->size)
287 ret = -2;
288 else {
289 /* Just overwrite the generated ConfigROM image with new data,
290 * it can be regenerated later. */
291 memcpy(host->csr.rom->cache_head->data, new_rom, buffersize);
292 host->csr.rom->cache_head->len = buffersize;
293
294 if (host->driver->set_hw_config_rom)
295 host->driver->set_hw_config_rom(host, host->csr.rom->bus_info_data);
296 /* Increment the generation number to keep some sort of sync
297 * with the newer ConfigROM manipulation method. */
298 host->csr.generation++;
299 if (host->csr.generation > 0xf || host->csr.generation < 2)
300 host->csr.generation = 2;
301 ret=0;
302 }
303 spin_unlock_irqrestore(&host->csr.lock, flags);
304 return ret;
305}
306
307
308/* Read topology / speed maps and configuration ROM */
309static int read_maps(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
310 u64 addr, size_t length, u16 fl)
311{
312 unsigned long flags;
313 int csraddr = addr - CSR_REGISTER_BASE;
314 const char *src;
315
316 spin_lock_irqsave(&host->csr.lock, flags);
317
318 if (csraddr < CSR_SPEED_MAP) {
319 src = ((char *)host->csr.topology_map) + csraddr
320 - CSR_TOPOLOGY_MAP;
321 } else {
322 src = ((char *)host->csr.speed_map) + csraddr - CSR_SPEED_MAP;
323 }
324
325 memcpy(buffer, src, length);
326 spin_unlock_irqrestore(&host->csr.lock, flags);
327 return RCODE_COMPLETE;
328}
329
330
331#define out if (--length == 0) break
332
333static int read_regs(struct hpsb_host *host, int nodeid, quadlet_t *buf,
334 u64 addr, size_t length, u16 flags)
335{
336 int csraddr = addr - CSR_REGISTER_BASE;
337 int oldcycle;
338 quadlet_t ret;
339
340 if ((csraddr | length) & 0x3)
341 return RCODE_TYPE_ERROR;
342
343 length /= 4;
344
345 switch (csraddr) {
346 case CSR_STATE_CLEAR:
347 *(buf++) = cpu_to_be32(host->csr.state);
348 out;
349 case CSR_STATE_SET:
350 *(buf++) = cpu_to_be32(host->csr.state);
351 out;
352 case CSR_NODE_IDS:
353 *(buf++) = cpu_to_be32(host->csr.node_ids);
354 out;
355
356 case CSR_RESET_START:
357 return RCODE_TYPE_ERROR;
358
359 /* address gap - handled by default below */
360
361 case CSR_SPLIT_TIMEOUT_HI:
362 *(buf++) = cpu_to_be32(host->csr.split_timeout_hi);
363 out;
364 case CSR_SPLIT_TIMEOUT_LO:
365 *(buf++) = cpu_to_be32(host->csr.split_timeout_lo);
366 out;
367
368 /* address gap */
369 return RCODE_ADDRESS_ERROR;
370
371 case CSR_CYCLE_TIME:
372 oldcycle = host->csr.cycle_time;
373 host->csr.cycle_time =
374 host->driver->devctl(host, GET_CYCLE_COUNTER, 0);
375
376 if (oldcycle > host->csr.cycle_time) {
377 /* cycle time wrapped around */
378 host->csr.bus_time += 1 << 7;
379 }
380 *(buf++) = cpu_to_be32(host->csr.cycle_time);
381 out;
382 case CSR_BUS_TIME:
383 oldcycle = host->csr.cycle_time;
384 host->csr.cycle_time =
385 host->driver->devctl(host, GET_CYCLE_COUNTER, 0);
386
387 if (oldcycle > host->csr.cycle_time) {
388 /* cycle time wrapped around */
389 host->csr.bus_time += (1 << 7);
390 }
391 *(buf++) = cpu_to_be32(host->csr.bus_time
392 | (host->csr.cycle_time >> 25));
393 out;
394
395 /* address gap */
396 return RCODE_ADDRESS_ERROR;
397
398 case CSR_BUSY_TIMEOUT:
399 /* not yet implemented */
400 return RCODE_ADDRESS_ERROR;
401
402 case CSR_BUS_MANAGER_ID:
403 if (host->driver->hw_csr_reg)
404 ret = host->driver->hw_csr_reg(host, 0, 0, 0);
405 else
406 ret = host->csr.bus_manager_id;
407
408 *(buf++) = cpu_to_be32(ret);
409 out;
410 case CSR_BANDWIDTH_AVAILABLE:
411 if (host->driver->hw_csr_reg)
412 ret = host->driver->hw_csr_reg(host, 1, 0, 0);
413 else
414 ret = host->csr.bandwidth_available;
415
416 *(buf++) = cpu_to_be32(ret);
417 out;
418 case CSR_CHANNELS_AVAILABLE_HI:
419 if (host->driver->hw_csr_reg)
420 ret = host->driver->hw_csr_reg(host, 2, 0, 0);
421 else
422 ret = host->csr.channels_available_hi;
423
424 *(buf++) = cpu_to_be32(ret);
425 out;
426 case CSR_CHANNELS_AVAILABLE_LO:
427 if (host->driver->hw_csr_reg)
428 ret = host->driver->hw_csr_reg(host, 3, 0, 0);
429 else
430 ret = host->csr.channels_available_lo;
431
432 *(buf++) = cpu_to_be32(ret);
433 out;
434
435 case CSR_BROADCAST_CHANNEL:
436 *(buf++) = cpu_to_be32(host->csr.broadcast_channel);
437 out;
438
439 /* address gap to end - fall through to default */
440 default:
441 return RCODE_ADDRESS_ERROR;
442 }
443
444 return RCODE_COMPLETE;
445}
446
447static int write_regs(struct hpsb_host *host, int nodeid, int destid,
448 quadlet_t *data, u64 addr, size_t length, u16 flags)
449{
450 int csraddr = addr - CSR_REGISTER_BASE;
451
452 if ((csraddr | length) & 0x3)
453 return RCODE_TYPE_ERROR;
454
455 length /= 4;
456
457 switch (csraddr) {
458 case CSR_STATE_CLEAR:
459 /* FIXME FIXME FIXME */
460 printk("doh, someone wants to mess with state clear\n");
461 out;
462 case CSR_STATE_SET:
463 printk("doh, someone wants to mess with state set\n");
464 out;
465
466 case CSR_NODE_IDS:
467 host->csr.node_ids &= NODE_MASK << 16;
468 host->csr.node_ids |= be32_to_cpu(*(data++)) & (BUS_MASK << 16);
469 host->node_id = host->csr.node_ids >> 16;
470 host->driver->devctl(host, SET_BUS_ID, host->node_id >> 6);
471 out;
472
473 case CSR_RESET_START:
474 /* FIXME - perform command reset */
475 out;
476
477 /* address gap */
478 return RCODE_ADDRESS_ERROR;
479
480 case CSR_SPLIT_TIMEOUT_HI:
481 host->csr.split_timeout_hi =
482 be32_to_cpu(*(data++)) & 0x00000007;
483 calculate_expire(&host->csr);
484 out;
485 case CSR_SPLIT_TIMEOUT_LO:
486 host->csr.split_timeout_lo =
487 be32_to_cpu(*(data++)) & 0xfff80000;
488 calculate_expire(&host->csr);
489 out;
490
491 /* address gap */
492 return RCODE_ADDRESS_ERROR;
493
494 case CSR_CYCLE_TIME:
495 /* should only be set by cycle start packet, automatically */
496 host->csr.cycle_time = be32_to_cpu(*data);
497 host->driver->devctl(host, SET_CYCLE_COUNTER,
498 be32_to_cpu(*(data++)));
499 out;
500 case CSR_BUS_TIME:
501 host->csr.bus_time = be32_to_cpu(*(data++)) & 0xffffff80;
502 out;
503
504 /* address gap */
505 return RCODE_ADDRESS_ERROR;
506
507 case CSR_BUSY_TIMEOUT:
508 /* not yet implemented */
509 return RCODE_ADDRESS_ERROR;
510
511 case CSR_BUS_MANAGER_ID:
512 case CSR_BANDWIDTH_AVAILABLE:
513 case CSR_CHANNELS_AVAILABLE_HI:
514 case CSR_CHANNELS_AVAILABLE_LO:
515 /* these are not writable, only lockable */
516 return RCODE_TYPE_ERROR;
517
518 case CSR_BROADCAST_CHANNEL:
519 /* only the valid bit can be written */
520 host->csr.broadcast_channel = (host->csr.broadcast_channel & ~0x40000000)
521 | (be32_to_cpu(*data) & 0x40000000);
522 out;
523
524 /* address gap to end - fall through */
525 default:
526 return RCODE_ADDRESS_ERROR;
527 }
528
529 return RCODE_COMPLETE;
530}
531
532#undef out
533
534
535static int lock_regs(struct hpsb_host *host, int nodeid, quadlet_t *store,
536 u64 addr, quadlet_t data, quadlet_t arg, int extcode, u16 fl)
537{
538 int csraddr = addr - CSR_REGISTER_BASE;
539 unsigned long flags;
540 quadlet_t *regptr = NULL;
541
542 if (csraddr & 0x3)
543 return RCODE_TYPE_ERROR;
544
545 if (csraddr < CSR_BUS_MANAGER_ID || csraddr > CSR_CHANNELS_AVAILABLE_LO
546 || extcode != EXTCODE_COMPARE_SWAP)
547 goto unsupported_lockreq;
548
549 data = be32_to_cpu(data);
550 arg = be32_to_cpu(arg);
551
552 /* Is somebody releasing the broadcast_channel on us? */
553 if (csraddr == CSR_CHANNELS_AVAILABLE_HI && (data & 0x1)) {
554 /* Note: this is may not be the right way to handle
555 * the problem, so we should look into the proper way
556 * eventually. */
557 HPSB_WARN("Node [" NODE_BUS_FMT "] wants to release "
558 "broadcast channel 31. Ignoring.",
559 NODE_BUS_ARGS(host, nodeid));
560
561 data &= ~0x1; /* keep broadcast channel allocated */
562 }
563
564 if (host->driver->hw_csr_reg) {
565 quadlet_t old;
566
567 old = host->driver->
568 hw_csr_reg(host, (csraddr - CSR_BUS_MANAGER_ID) >> 2,
569 data, arg);
570
571 *store = cpu_to_be32(old);
572 return RCODE_COMPLETE;
573 }
574
575 spin_lock_irqsave(&host->csr.lock, flags);
576
577 switch (csraddr) {
578 case CSR_BUS_MANAGER_ID:
579 regptr = &host->csr.bus_manager_id;
580 *store = cpu_to_be32(*regptr);
581 if (*regptr == arg)
582 *regptr = data;
583 break;
584
585 case CSR_BANDWIDTH_AVAILABLE:
586 {
587 quadlet_t bandwidth;
588 quadlet_t old;
589 quadlet_t new;
590
591 regptr = &host->csr.bandwidth_available;
592 old = *regptr;
593
594 /* bandwidth available algorithm adapted from IEEE 1394a-2000 spec */
595 if (arg > 0x1fff) {
596 *store = cpu_to_be32(old); /* change nothing */
597 break;
598 }
599 data &= 0x1fff;
600 if (arg >= data) {
601 /* allocate bandwidth */
602 bandwidth = arg - data;
603 if (old >= bandwidth) {
604 new = old - bandwidth;
605 *store = cpu_to_be32(arg);
606 *regptr = new;
607 } else {
608 *store = cpu_to_be32(old);
609 }
610 } else {
611 /* deallocate bandwidth */
612 bandwidth = data - arg;
613 if (old + bandwidth < 0x2000) {
614 new = old + bandwidth;
615 *store = cpu_to_be32(arg);
616 *regptr = new;
617 } else {
618 *store = cpu_to_be32(old);
619 }
620 }
621 break;
622 }
623
624 case CSR_CHANNELS_AVAILABLE_HI:
625 {
626 /* Lock algorithm for CHANNELS_AVAILABLE as recommended by 1394a-2000 */
627 quadlet_t affected_channels = arg ^ data;
628
629 regptr = &host->csr.channels_available_hi;
630
631 if ((arg & affected_channels) == (*regptr & affected_channels)) {
632 *regptr ^= affected_channels;
633 *store = cpu_to_be32(arg);
634 } else {
635 *store = cpu_to_be32(*regptr);
636 }
637
638 break;
639 }
640
641 case CSR_CHANNELS_AVAILABLE_LO:
642 {
643 /* Lock algorithm for CHANNELS_AVAILABLE as recommended by 1394a-2000 */
644 quadlet_t affected_channels = arg ^ data;
645
646 regptr = &host->csr.channels_available_lo;
647
648 if ((arg & affected_channels) == (*regptr & affected_channels)) {
649 *regptr ^= affected_channels;
650 *store = cpu_to_be32(arg);
651 } else {
652 *store = cpu_to_be32(*regptr);
653 }
654 break;
655 }
656 }
657
658 spin_unlock_irqrestore(&host->csr.lock, flags);
659
660 return RCODE_COMPLETE;
661
662 unsupported_lockreq:
663 switch (csraddr) {
664 case CSR_STATE_CLEAR:
665 case CSR_STATE_SET:
666 case CSR_RESET_START:
667 case CSR_NODE_IDS:
668 case CSR_SPLIT_TIMEOUT_HI:
669 case CSR_SPLIT_TIMEOUT_LO:
670 case CSR_CYCLE_TIME:
671 case CSR_BUS_TIME:
672 case CSR_BROADCAST_CHANNEL:
673 return RCODE_TYPE_ERROR;
674
675 case CSR_BUSY_TIMEOUT:
676 /* not yet implemented - fall through */
677 default:
678 return RCODE_ADDRESS_ERROR;
679 }
680}
681
682static int lock64_regs(struct hpsb_host *host, int nodeid, octlet_t * store,
683 u64 addr, octlet_t data, octlet_t arg, int extcode, u16 fl)
684{
685 int csraddr = addr - CSR_REGISTER_BASE;
686 unsigned long flags;
687
688 data = be64_to_cpu(data);
689 arg = be64_to_cpu(arg);
690
691 if (csraddr & 0x3)
692 return RCODE_TYPE_ERROR;
693
694 if (csraddr != CSR_CHANNELS_AVAILABLE
695 || extcode != EXTCODE_COMPARE_SWAP)
696 goto unsupported_lock64req;
697
698 /* Is somebody releasing the broadcast_channel on us? */
699 if (csraddr == CSR_CHANNELS_AVAILABLE_HI && (data & 0x100000000ULL)) {
700 /* Note: this is may not be the right way to handle
701 * the problem, so we should look into the proper way
702 * eventually. */
703 HPSB_WARN("Node [" NODE_BUS_FMT "] wants to release "
704 "broadcast channel 31. Ignoring.",
705 NODE_BUS_ARGS(host, nodeid));
706
707 data &= ~0x100000000ULL; /* keep broadcast channel allocated */
708 }
709
710 if (host->driver->hw_csr_reg) {
711 quadlet_t data_hi, data_lo;
712 quadlet_t arg_hi, arg_lo;
713 quadlet_t old_hi, old_lo;
714
715 data_hi = data >> 32;
716 data_lo = data & 0xFFFFFFFF;
717 arg_hi = arg >> 32;
718 arg_lo = arg & 0xFFFFFFFF;
719
720 old_hi = host->driver->hw_csr_reg(host, (csraddr - CSR_BUS_MANAGER_ID) >> 2,
721 data_hi, arg_hi);
722
723 old_lo = host->driver->hw_csr_reg(host, ((csraddr + 4) - CSR_BUS_MANAGER_ID) >> 2,
724 data_lo, arg_lo);
725
726 *store = cpu_to_be64(((octlet_t)old_hi << 32) | old_lo);
727 } else {
728 octlet_t old;
729 octlet_t affected_channels = arg ^ data;
730
731 spin_lock_irqsave(&host->csr.lock, flags);
732
733 old = ((octlet_t)host->csr.channels_available_hi << 32) | host->csr.channels_available_lo;
734
735 if ((arg & affected_channels) == (old & affected_channels)) {
736 host->csr.channels_available_hi ^= (affected_channels >> 32);
737 host->csr.channels_available_lo ^= (affected_channels & 0xffffffff);
738 *store = cpu_to_be64(arg);
739 } else {
740 *store = cpu_to_be64(old);
741 }
742
743 spin_unlock_irqrestore(&host->csr.lock, flags);
744 }
745
746 /* Is somebody erroneously releasing the broadcast_channel on us? */
747 if (host->csr.channels_available_hi & 0x1)
748 host->csr.channels_available_hi &= ~0x1;
749
750 return RCODE_COMPLETE;
751
752 unsupported_lock64req:
753 switch (csraddr) {
754 case CSR_STATE_CLEAR:
755 case CSR_STATE_SET:
756 case CSR_RESET_START:
757 case CSR_NODE_IDS:
758 case CSR_SPLIT_TIMEOUT_HI:
759 case CSR_SPLIT_TIMEOUT_LO:
760 case CSR_CYCLE_TIME:
761 case CSR_BUS_TIME:
762 case CSR_BUS_MANAGER_ID:
763 case CSR_BROADCAST_CHANNEL:
764 case CSR_BUSY_TIMEOUT:
765 case CSR_BANDWIDTH_AVAILABLE:
766 return RCODE_TYPE_ERROR;
767
768 default:
769 return RCODE_ADDRESS_ERROR;
770 }
771}
772
773static int write_fcp(struct hpsb_host *host, int nodeid, int dest,
774 quadlet_t *data, u64 addr, size_t length, u16 flags)
775{
776 int csraddr = addr - CSR_REGISTER_BASE;
777
778 if (length > 512)
779 return RCODE_TYPE_ERROR;
780
781 switch (csraddr) {
782 case CSR_FCP_COMMAND:
783 highlevel_fcp_request(host, nodeid, 0, (u8 *)data, length);
784 break;
785 case CSR_FCP_RESPONSE:
786 highlevel_fcp_request(host, nodeid, 1, (u8 *)data, length);
787 break;
788 default:
789 return RCODE_TYPE_ERROR;
790 }
791
792 return RCODE_COMPLETE;
793}
794
795static int read_config_rom(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
796 u64 addr, size_t length, u16 fl)
797{
798 u32 offset = addr - CSR1212_REGISTER_SPACE_BASE;
799
800 if (csr1212_read(host->csr.rom, offset, buffer, length) == CSR1212_SUCCESS)
801 return RCODE_COMPLETE;
802 else
803 return RCODE_ADDRESS_ERROR;
804}
805
806static u64 allocate_addr_range(u64 size, u32 alignment, void *__host)
807{
808 struct hpsb_host *host = (struct hpsb_host*)__host;
809
810 return hpsb_allocate_and_register_addrspace(&csr_highlevel,
811 host,
812 &config_rom_ops,
813 size, alignment,
814 CSR1212_UNITS_SPACE_BASE,
815 CSR1212_UNITS_SPACE_END);
816}
817
818static void release_addr_range(u64 addr, void *__host)
819{
820 struct hpsb_host *host = (struct hpsb_host*)__host;
821 hpsb_unregister_addrspace(&csr_highlevel, host, addr);
822}
823
824
825int init_csr(void)
826{
827 node_cap = csr1212_new_immediate(CSR1212_KV_ID_NODE_CAPABILITIES, 0x0083c0);
828 if (!node_cap) {
829 HPSB_ERR("Failed to allocate memory for Node Capabilties ConfigROM entry!");
830 return -ENOMEM;
831 }
832
833 hpsb_register_highlevel(&csr_highlevel);
834
835 return 0;
836}
837
838void cleanup_csr(void)
839{
840 if (node_cap)
841 csr1212_release_keyval(node_cap);
842 hpsb_unregister_highlevel(&csr_highlevel);
843}
Linux 6.x block layer and io_uring tree(s)