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Add cmpxchg64 and cmpxchg64_local to powerpc
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / ieee1394 / csr.c
blob52ac83e0ebee9bb510fd3b2a0051bffe2b1d0a25
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
20 #include <linux/jiffies.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/param.h>
25 #include <linux/spinlock.h>
26 #include <linux/string.h>
27
28 #include "csr1212.h"
29 #include "ieee1394_types.h"
30 #include "hosts.h"
31 #include "ieee1394.h"
32 #include "highlevel.h"
33 #include "ieee1394_core.h"
34
35 /* Module Parameters */
36 /* this module parameter can be used to disable mapping of the FCP registers */
37
38 static int fcp = 1;
39 module_param(fcp, int, 0444);
40 MODULE_PARM_DESC(fcp, "Map FCP registers (default = 1, disable = 0).");
41
42 static struct csr1212_keyval *node_cap = NULL;
43
44 static void add_host(struct hpsb_host *host);
45 static void remove_host(struct hpsb_host *host);
46 static void host_reset(struct hpsb_host *host);
47 static int read_maps(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
48 u64 addr, size_t length, u16 fl);
49 static int write_fcp(struct hpsb_host *host, int nodeid, int dest,
50 quadlet_t *data, u64 addr, size_t length, u16 flags);
51 static int read_regs(struct hpsb_host *host, int nodeid, quadlet_t *buf,
52 u64 addr, size_t length, u16 flags);
53 static int write_regs(struct hpsb_host *host, int nodeid, int destid,
54 quadlet_t *data, u64 addr, size_t length, u16 flags);
55 static 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);
57 static 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);
59 static int read_config_rom(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
60 u64 addr, size_t length, u16 fl);
61 static u64 allocate_addr_range(u64 size, u32 alignment, void *__host);
62 static void release_addr_range(u64 addr, void *__host);
63
64 static 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
71 static struct hpsb_address_ops map_ops = {
72 .read = read_maps,
73 };
74
75 static struct hpsb_address_ops fcp_ops = {
76 .write = write_fcp,
77 };
78
79 static struct hpsb_address_ops reg_ops = {
80 .read = read_regs,
81 .write = write_regs,
82 .lock = lock_regs,
83 .lock64 = lock64_regs,
84 };
85
86 static struct hpsb_address_ops config_rom_ops = {
87 .read = read_config_rom,
88 };
89
90 struct csr1212_bus_ops csr_bus_ops = {
91 .allocate_addr_range = allocate_addr_range,
92 .release_addr = release_addr_range,
93 };
94
95
96 static 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
113 static 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
136 host->csr.topology_map[1] =
137 cpu_to_be32(be32_to_cpu(host->csr.topology_map[1]) + 1);
138 host->csr.topology_map[2] = cpu_to_be32(host->node_count << 16
139 | host->selfid_count);
140 host->csr.topology_map[0] =
141 cpu_to_be32((host->selfid_count + 2) << 16
142 | csr_crc16(host->csr.topology_map + 1,
143 host->selfid_count + 2));
144
145 host->csr.speed_map[1] =
146 cpu_to_be32(be32_to_cpu(host->csr.speed_map[1]) + 1);
147 host->csr.speed_map[0] = cpu_to_be32(0x3f1 << 16
148 | csr_crc16(host->csr.speed_map+1,
149 0x3f1));
150 }
151
152 /*
153 * HI == seconds (bits 0:2)
154 * LO == fractions of a second in units of 125usec (bits 19:31)
155 *
156 * Convert SPLIT_TIMEOUT to jiffies.
157 * The default and minimum as per 1394a-2000 clause 8.3.2.2.6 is 100ms.
158 */
159 static inline void calculate_expire(struct csr_control *csr)
160 {
161 unsigned int usecs = (csr->split_timeout_hi & 7) * 1000000 +
162 (csr->split_timeout_lo >> 19) * 125;
163
164 csr->expire = usecs_to_jiffies(usecs > 100000 ? usecs : 100000);
165 HPSB_VERBOSE("CSR: setting expire to %lu, HZ=%u", csr->expire, HZ);
166 }
167
168
169 static void add_host(struct hpsb_host *host)
170 {
171 struct csr1212_keyval *root;
172 quadlet_t bus_info[CSR_BUS_INFO_SIZE];
173
174 hpsb_register_addrspace(&csr_highlevel, host, &reg_ops,
175 CSR_REGISTER_BASE,
176 CSR_REGISTER_BASE + CSR_CONFIG_ROM);
177 hpsb_register_addrspace(&csr_highlevel, host, &config_rom_ops,
178 CSR_REGISTER_BASE + CSR_CONFIG_ROM,
179 CSR_REGISTER_BASE + CSR_CONFIG_ROM_END);
180 if (fcp) {
181 hpsb_register_addrspace(&csr_highlevel, host, &fcp_ops,
182 CSR_REGISTER_BASE + CSR_FCP_COMMAND,
183 CSR_REGISTER_BASE + CSR_FCP_END);
184 }
185 hpsb_register_addrspace(&csr_highlevel, host, &map_ops,
186 CSR_REGISTER_BASE + CSR_TOPOLOGY_MAP,
187 CSR_REGISTER_BASE + CSR_TOPOLOGY_MAP_END);
188 hpsb_register_addrspace(&csr_highlevel, host, &map_ops,
189 CSR_REGISTER_BASE + CSR_SPEED_MAP,
190 CSR_REGISTER_BASE + CSR_SPEED_MAP_END);
191
192 spin_lock_init(&host->csr.lock);
193
194 host->csr.state = 0;
195 host->csr.node_ids = 0;
196 host->csr.split_timeout_hi = 0;
197 host->csr.split_timeout_lo = 800 << 19;
198 calculate_expire(&host->csr);
199 host->csr.cycle_time = 0;
200 host->csr.bus_time = 0;
201 host->csr.bus_manager_id = 0x3f;
202 host->csr.bandwidth_available = 4915;
203 host->csr.channels_available_hi = 0xfffffffe; /* pre-alloc ch 31 per 1394a-2000 */
204 host->csr.channels_available_lo = ~0;
205 host->csr.broadcast_channel = 0x80000000 | 31;
206
207 if (host->is_irm) {
208 if (host->driver->hw_csr_reg) {
209 host->driver->hw_csr_reg(host, 2, 0xfffffffe, ~0);
210 }
211 }
212
213 if (host->csr.max_rec >= 9)
214 host->csr.max_rom = 2;
215 else if (host->csr.max_rec >= 5)
216 host->csr.max_rom = 1;
217 else
218 host->csr.max_rom = 0;
219
220 host->csr.generation = 2;
221
222 bus_info[1] = __constant_cpu_to_be32(0x31333934);
223 bus_info[2] = cpu_to_be32((hpsb_disable_irm ? 0 : 1 << CSR_IRMC_SHIFT) |
224 (1 << CSR_CMC_SHIFT) |
225 (1 << CSR_ISC_SHIFT) |
226 (0 << CSR_BMC_SHIFT) |
227 (0 << CSR_PMC_SHIFT) |
228 (host->csr.cyc_clk_acc << CSR_CYC_CLK_ACC_SHIFT) |
229 (host->csr.max_rec << CSR_MAX_REC_SHIFT) |
230 (host->csr.max_rom << CSR_MAX_ROM_SHIFT) |
231 (host->csr.generation << CSR_GENERATION_SHIFT) |
232 host->csr.lnk_spd);
233
234 bus_info[3] = cpu_to_be32(host->csr.guid_hi);
235 bus_info[4] = cpu_to_be32(host->csr.guid_lo);
236
237 /* The hardware copy of the bus info block will be set later when a
238 * bus reset is issued. */
239
240 csr1212_init_local_csr(host->csr.rom, bus_info, host->csr.max_rom);
241
242 root = host->csr.rom->root_kv;
243
244 if(csr1212_attach_keyval_to_directory(root, node_cap) != CSR1212_SUCCESS) {
245 HPSB_ERR("Failed to attach Node Capabilities to root directory");
246 }
247
248 host->update_config_rom = 1;
249 }
250
251 static void remove_host(struct hpsb_host *host)
252 {
253 quadlet_t bus_info[CSR_BUS_INFO_SIZE];
254
255 bus_info[1] = __constant_cpu_to_be32(0x31333934);
256 bus_info[2] = cpu_to_be32((0 << CSR_IRMC_SHIFT) |
257 (0 << CSR_CMC_SHIFT) |
258 (0 << CSR_ISC_SHIFT) |
259 (0 << CSR_BMC_SHIFT) |
260 (0 << CSR_PMC_SHIFT) |
261 (host->csr.cyc_clk_acc << CSR_CYC_CLK_ACC_SHIFT) |
262 (host->csr.max_rec << CSR_MAX_REC_SHIFT) |
263 (0 << CSR_MAX_ROM_SHIFT) |
264 (0 << CSR_GENERATION_SHIFT) |
265 host->csr.lnk_spd);
266
267 bus_info[3] = cpu_to_be32(host->csr.guid_hi);
268 bus_info[4] = cpu_to_be32(host->csr.guid_lo);
269
270 csr1212_detach_keyval_from_directory(host->csr.rom->root_kv, node_cap);
271
272 csr1212_init_local_csr(host->csr.rom, bus_info, 0);
273 host->update_config_rom = 1;
274 }
275
276
277 int hpsb_update_config_rom(struct hpsb_host *host, const quadlet_t *new_rom,
278 size_t buffersize, unsigned char rom_version)
279 {
280 unsigned long flags;
281 int ret;
282
283 HPSB_NOTICE("hpsb_update_config_rom() is deprecated");
284
285 spin_lock_irqsave(&host->csr.lock, flags);
286 if (rom_version != host->csr.generation)
287 ret = -1;
288 else if (buffersize > host->csr.rom->cache_head->size)
289 ret = -2;
290 else {
291 /* Just overwrite the generated ConfigROM image with new data,
292 * it can be regenerated later. */
293 memcpy(host->csr.rom->cache_head->data, new_rom, buffersize);
294 host->csr.rom->cache_head->len = buffersize;
295
296 if (host->driver->set_hw_config_rom)
297 host->driver->set_hw_config_rom(host, host->csr.rom->bus_info_data);
298 /* Increment the generation number to keep some sort of sync
299 * with the newer ConfigROM manipulation method. */
300 host->csr.generation++;
301 if (host->csr.generation > 0xf || host->csr.generation < 2)
302 host->csr.generation = 2;
303 ret=0;
304 }
305 spin_unlock_irqrestore(&host->csr.lock, flags);
306 return ret;
307 }
308
309
310 /* Read topology / speed maps and configuration ROM */
311 static int read_maps(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
312 u64 addr, size_t length, u16 fl)
313 {
314 unsigned long flags;
315 int csraddr = addr - CSR_REGISTER_BASE;
316 const char *src;
317
318 spin_lock_irqsave(&host->csr.lock, flags);
319
320 if (csraddr < CSR_SPEED_MAP) {
321 src = ((char *)host->csr.topology_map) + csraddr
322 - CSR_TOPOLOGY_MAP;
323 } else {
324 src = ((char *)host->csr.speed_map) + csraddr - CSR_SPEED_MAP;
325 }
326
327 memcpy(buffer, src, length);
328 spin_unlock_irqrestore(&host->csr.lock, flags);
329 return RCODE_COMPLETE;
330 }
331
332
333 #define out if (--length == 0) break
334
335 static int read_regs(struct hpsb_host *host, int nodeid, quadlet_t *buf,
336 u64 addr, size_t length, u16 flags)
337 {
338 int csraddr = addr - CSR_REGISTER_BASE;
339 int oldcycle;
340 quadlet_t ret;
341
342 if ((csraddr | length) & 0x3)
343 return RCODE_TYPE_ERROR;
344
345 length /= 4;
346
347 switch (csraddr) {
348 case CSR_STATE_CLEAR:
349 *(buf++) = cpu_to_be32(host->csr.state);
350 out;
351 case CSR_STATE_SET:
352 *(buf++) = cpu_to_be32(host->csr.state);
353 out;
354 case CSR_NODE_IDS:
355 *(buf++) = cpu_to_be32(host->csr.node_ids);
356 out;
357
358 case CSR_RESET_START:
359 return RCODE_TYPE_ERROR;
360
361 /* address gap - handled by default below */
362
363 case CSR_SPLIT_TIMEOUT_HI:
364 *(buf++) = cpu_to_be32(host->csr.split_timeout_hi);
365 out;
366 case CSR_SPLIT_TIMEOUT_LO:
367 *(buf++) = cpu_to_be32(host->csr.split_timeout_lo);
368 out;
369
370 /* address gap */
371 return RCODE_ADDRESS_ERROR;
372
373 case CSR_CYCLE_TIME:
374 oldcycle = host->csr.cycle_time;
375 host->csr.cycle_time =
376 host->driver->devctl(host, GET_CYCLE_COUNTER, 0);
377
378 if (oldcycle > host->csr.cycle_time) {
379 /* cycle time wrapped around */
380 host->csr.bus_time += 1 << 7;
381 }
382 *(buf++) = cpu_to_be32(host->csr.cycle_time);
383 out;
384 case CSR_BUS_TIME:
385 oldcycle = host->csr.cycle_time;
386 host->csr.cycle_time =
387 host->driver->devctl(host, GET_CYCLE_COUNTER, 0);
388
389 if (oldcycle > host->csr.cycle_time) {
390 /* cycle time wrapped around */
391 host->csr.bus_time += (1 << 7);
392 }
393 *(buf++) = cpu_to_be32(host->csr.bus_time
394 | (host->csr.cycle_time >> 25));
395 out;
396
397 /* address gap */
398 return RCODE_ADDRESS_ERROR;
399
400 case CSR_BUSY_TIMEOUT:
401 /* not yet implemented */
402 return RCODE_ADDRESS_ERROR;
403
404 case CSR_BUS_MANAGER_ID:
405 if (host->driver->hw_csr_reg)
406 ret = host->driver->hw_csr_reg(host, 0, 0, 0);
407 else
408 ret = host->csr.bus_manager_id;
409
410 *(buf++) = cpu_to_be32(ret);
411 out;
412 case CSR_BANDWIDTH_AVAILABLE:
413 if (host->driver->hw_csr_reg)
414 ret = host->driver->hw_csr_reg(host, 1, 0, 0);
415 else
416 ret = host->csr.bandwidth_available;
417
418 *(buf++) = cpu_to_be32(ret);
419 out;
420 case CSR_CHANNELS_AVAILABLE_HI:
421 if (host->driver->hw_csr_reg)
422 ret = host->driver->hw_csr_reg(host, 2, 0, 0);
423 else
424 ret = host->csr.channels_available_hi;
425
426 *(buf++) = cpu_to_be32(ret);
427 out;
428 case CSR_CHANNELS_AVAILABLE_LO:
429 if (host->driver->hw_csr_reg)
430 ret = host->driver->hw_csr_reg(host, 3, 0, 0);
431 else
432 ret = host->csr.channels_available_lo;
433
434 *(buf++) = cpu_to_be32(ret);
435 out;
436
437 case CSR_BROADCAST_CHANNEL:
438 *(buf++) = cpu_to_be32(host->csr.broadcast_channel);
439 out;
440
441 /* address gap to end - fall through to default */
442 default:
443 return RCODE_ADDRESS_ERROR;
444 }
445
446 return RCODE_COMPLETE;
447 }
448
449 static int write_regs(struct hpsb_host *host, int nodeid, int destid,
450 quadlet_t *data, u64 addr, size_t length, u16 flags)
451 {
452 int csraddr = addr - CSR_REGISTER_BASE;
453
454 if ((csraddr | length) & 0x3)
455 return RCODE_TYPE_ERROR;
456
457 length /= 4;
458
459 switch (csraddr) {
460 case CSR_STATE_CLEAR:
461 /* FIXME FIXME FIXME */
462 printk("doh, someone wants to mess with state clear\n");
463 out;
464 case CSR_STATE_SET:
465 printk("doh, someone wants to mess with state set\n");
466 out;
467
468 case CSR_NODE_IDS:
469 host->csr.node_ids &= NODE_MASK << 16;
470 host->csr.node_ids |= be32_to_cpu(*(data++)) & (BUS_MASK << 16);
471 host->node_id = host->csr.node_ids >> 16;
472 host->driver->devctl(host, SET_BUS_ID, host->node_id >> 6);
473 out;
474
475 case CSR_RESET_START:
476 /* FIXME - perform command reset */
477 out;
478
479 /* address gap */
480 return RCODE_ADDRESS_ERROR;
481
482 case CSR_SPLIT_TIMEOUT_HI:
483 host->csr.split_timeout_hi =
484 be32_to_cpu(*(data++)) & 0x00000007;
485 calculate_expire(&host->csr);
486 out;
487 case CSR_SPLIT_TIMEOUT_LO:
488 host->csr.split_timeout_lo =
489 be32_to_cpu(*(data++)) & 0xfff80000;
490 calculate_expire(&host->csr);
491 out;
492
493 /* address gap */
494 return RCODE_ADDRESS_ERROR;
495
496 case CSR_CYCLE_TIME:
497 /* should only be set by cycle start packet, automatically */
498 host->csr.cycle_time = be32_to_cpu(*data);
499 host->driver->devctl(host, SET_CYCLE_COUNTER,
500 be32_to_cpu(*(data++)));
501 out;
502 case CSR_BUS_TIME:
503 host->csr.bus_time = be32_to_cpu(*(data++)) & 0xffffff80;
504 out;
505
506 /* address gap */
507 return RCODE_ADDRESS_ERROR;
508
509 case CSR_BUSY_TIMEOUT:
510 /* not yet implemented */
511 return RCODE_ADDRESS_ERROR;
512
513 case CSR_BUS_MANAGER_ID:
514 case CSR_BANDWIDTH_AVAILABLE:
515 case CSR_CHANNELS_AVAILABLE_HI:
516 case CSR_CHANNELS_AVAILABLE_LO:
517 /* these are not writable, only lockable */
518 return RCODE_TYPE_ERROR;
519
520 case CSR_BROADCAST_CHANNEL:
521 /* only the valid bit can be written */
522 host->csr.broadcast_channel = (host->csr.broadcast_channel & ~0x40000000)
523 | (be32_to_cpu(*data) & 0x40000000);
524 out;
525
526 /* address gap to end - fall through */
527 default:
528 return RCODE_ADDRESS_ERROR;
529 }
530
531 return RCODE_COMPLETE;
532 }
533
534 #undef out
535
536
537 static int lock_regs(struct hpsb_host *host, int nodeid, quadlet_t *store,
538 u64 addr, quadlet_t data, quadlet_t arg, int extcode, u16 fl)
539 {
540 int csraddr = addr - CSR_REGISTER_BASE;
541 unsigned long flags;
542 quadlet_t *regptr = NULL;
543
544 if (csraddr & 0x3)
545 return RCODE_TYPE_ERROR;
546
547 if (csraddr < CSR_BUS_MANAGER_ID || csraddr > CSR_CHANNELS_AVAILABLE_LO
548 || extcode != EXTCODE_COMPARE_SWAP)
549 goto unsupported_lockreq;
550
551 data = be32_to_cpu(data);
552 arg = be32_to_cpu(arg);
553
554 /* Is somebody releasing the broadcast_channel on us? */
555 if (csraddr == CSR_CHANNELS_AVAILABLE_HI && (data & 0x1)) {
556 /* Note: this is may not be the right way to handle
557 * the problem, so we should look into the proper way
558 * eventually. */
559 HPSB_WARN("Node [" NODE_BUS_FMT "] wants to release "
560 "broadcast channel 31. Ignoring.",
561 NODE_BUS_ARGS(host, nodeid));
562
563 data &= ~0x1; /* keep broadcast channel allocated */
564 }
565
566 if (host->driver->hw_csr_reg) {
567 quadlet_t old;
568
569 old = host->driver->
570 hw_csr_reg(host, (csraddr - CSR_BUS_MANAGER_ID) >> 2,
571 data, arg);
572
573 *store = cpu_to_be32(old);
574 return RCODE_COMPLETE;
575 }
576
577 spin_lock_irqsave(&host->csr.lock, flags);
578
579 switch (csraddr) {
580 case CSR_BUS_MANAGER_ID:
581 regptr = &host->csr.bus_manager_id;
582 *store = cpu_to_be32(*regptr);
583 if (*regptr == arg)
584 *regptr = data;
585 break;
586
587 case CSR_BANDWIDTH_AVAILABLE:
588 {
589 quadlet_t bandwidth;
590 quadlet_t old;
591 quadlet_t new;
592
593 regptr = &host->csr.bandwidth_available;
594 old = *regptr;
595
596 /* bandwidth available algorithm adapted from IEEE 1394a-2000 spec */
597 if (arg > 0x1fff) {
598 *store = cpu_to_be32(old); /* change nothing */
599 break;
600 }
601 data &= 0x1fff;
602 if (arg >= data) {
603 /* allocate bandwidth */
604 bandwidth = arg - data;
605 if (old >= bandwidth) {
606 new = old - bandwidth;
607 *store = cpu_to_be32(arg);
608 *regptr = new;
609 } else {
610 *store = cpu_to_be32(old);
611 }
612 } else {
613 /* deallocate bandwidth */
614 bandwidth = data - arg;
615 if (old + bandwidth < 0x2000) {
616 new = old + bandwidth;
617 *store = cpu_to_be32(arg);
618 *regptr = new;
619 } else {
620 *store = cpu_to_be32(old);
621 }
622 }
623 break;
624 }
625
626 case CSR_CHANNELS_AVAILABLE_HI:
627 {
628 /* Lock algorithm for CHANNELS_AVAILABLE as recommended by 1394a-2000 */
629 quadlet_t affected_channels = arg ^ data;
630
631 regptr = &host->csr.channels_available_hi;
632
633 if ((arg & affected_channels) == (*regptr & affected_channels)) {
634 *regptr ^= affected_channels;
635 *store = cpu_to_be32(arg);
636 } else {
637 *store = cpu_to_be32(*regptr);
638 }
639
640 break;
641 }
642
643 case CSR_CHANNELS_AVAILABLE_LO:
644 {
645 /* Lock algorithm for CHANNELS_AVAILABLE as recommended by 1394a-2000 */
646 quadlet_t affected_channels = arg ^ data;
647
648 regptr = &host->csr.channels_available_lo;
649
650 if ((arg & affected_channels) == (*regptr & affected_channels)) {
651 *regptr ^= affected_channels;
652 *store = cpu_to_be32(arg);
653 } else {
654 *store = cpu_to_be32(*regptr);
655 }
656 break;
657 }
658 }
659
660 spin_unlock_irqrestore(&host->csr.lock, flags);
661
662 return RCODE_COMPLETE;
663
664 unsupported_lockreq:
665 switch (csraddr) {
666 case CSR_STATE_CLEAR:
667 case CSR_STATE_SET:
668 case CSR_RESET_START:
669 case CSR_NODE_IDS:
670 case CSR_SPLIT_TIMEOUT_HI:
671 case CSR_SPLIT_TIMEOUT_LO:
672 case CSR_CYCLE_TIME:
673 case CSR_BUS_TIME:
674 case CSR_BROADCAST_CHANNEL:
675 return RCODE_TYPE_ERROR;
676
677 case CSR_BUSY_TIMEOUT:
678 /* not yet implemented - fall through */
679 default:
680 return RCODE_ADDRESS_ERROR;
681 }
682 }
683
684 static int lock64_regs(struct hpsb_host *host, int nodeid, octlet_t * store,
685 u64 addr, octlet_t data, octlet_t arg, int extcode, u16 fl)
686 {
687 int csraddr = addr - CSR_REGISTER_BASE;
688 unsigned long flags;
689
690 data = be64_to_cpu(data);
691 arg = be64_to_cpu(arg);
692
693 if (csraddr & 0x3)
694 return RCODE_TYPE_ERROR;
695
696 if (csraddr != CSR_CHANNELS_AVAILABLE
697 || extcode != EXTCODE_COMPARE_SWAP)
698 goto unsupported_lock64req;
699
700 /* Is somebody releasing the broadcast_channel on us? */
701 if (csraddr == CSR_CHANNELS_AVAILABLE_HI && (data & 0x100000000ULL)) {
702 /* Note: this is may not be the right way to handle
703 * the problem, so we should look into the proper way
704 * eventually. */
705 HPSB_WARN("Node [" NODE_BUS_FMT "] wants to release "
706 "broadcast channel 31. Ignoring.",
707 NODE_BUS_ARGS(host, nodeid));
708
709 data &= ~0x100000000ULL; /* keep broadcast channel allocated */
710 }
711
712 if (host->driver->hw_csr_reg) {
713 quadlet_t data_hi, data_lo;
714 quadlet_t arg_hi, arg_lo;
715 quadlet_t old_hi, old_lo;
716
717 data_hi = data >> 32;
718 data_lo = data & 0xFFFFFFFF;
719 arg_hi = arg >> 32;
720 arg_lo = arg & 0xFFFFFFFF;
721
722 old_hi = host->driver->hw_csr_reg(host, (csraddr - CSR_BUS_MANAGER_ID) >> 2,
723 data_hi, arg_hi);
724
725 old_lo = host->driver->hw_csr_reg(host, ((csraddr + 4) - CSR_BUS_MANAGER_ID) >> 2,
726 data_lo, arg_lo);
727
728 *store = cpu_to_be64(((octlet_t)old_hi << 32) | old_lo);
729 } else {
730 octlet_t old;
731 octlet_t affected_channels = arg ^ data;
732
733 spin_lock_irqsave(&host->csr.lock, flags);
734
735 old = ((octlet_t)host->csr.channels_available_hi << 32) | host->csr.channels_available_lo;
736
737 if ((arg & affected_channels) == (old & affected_channels)) {
738 host->csr.channels_available_hi ^= (affected_channels >> 32);
739 host->csr.channels_available_lo ^= (affected_channels & 0xffffffff);
740 *store = cpu_to_be64(arg);
741 } else {
742 *store = cpu_to_be64(old);
743 }
744
745 spin_unlock_irqrestore(&host->csr.lock, flags);
746 }
747
748 /* Is somebody erroneously releasing the broadcast_channel on us? */
749 if (host->csr.channels_available_hi & 0x1)
750 host->csr.channels_available_hi &= ~0x1;
751
752 return RCODE_COMPLETE;
753
754 unsupported_lock64req:
755 switch (csraddr) {
756 case CSR_STATE_CLEAR:
757 case CSR_STATE_SET:
758 case CSR_RESET_START:
759 case CSR_NODE_IDS:
760 case CSR_SPLIT_TIMEOUT_HI:
761 case CSR_SPLIT_TIMEOUT_LO:
762 case CSR_CYCLE_TIME:
763 case CSR_BUS_TIME:
764 case CSR_BUS_MANAGER_ID:
765 case CSR_BROADCAST_CHANNEL:
766 case CSR_BUSY_TIMEOUT:
767 case CSR_BANDWIDTH_AVAILABLE:
768 return RCODE_TYPE_ERROR;
769
770 default:
771 return RCODE_ADDRESS_ERROR;
772 }
773 }
774
775 static int write_fcp(struct hpsb_host *host, int nodeid, int dest,
776 quadlet_t *data, u64 addr, size_t length, u16 flags)
777 {
778 int csraddr = addr - CSR_REGISTER_BASE;
779
780 if (length > 512)
781 return RCODE_TYPE_ERROR;
782
783 switch (csraddr) {
784 case CSR_FCP_COMMAND:
785 highlevel_fcp_request(host, nodeid, 0, (u8 *)data, length);
786 break;
787 case CSR_FCP_RESPONSE:
788 highlevel_fcp_request(host, nodeid, 1, (u8 *)data, length);
789 break;
790 default:
791 return RCODE_TYPE_ERROR;
792 }
793
794 return RCODE_COMPLETE;
795 }
796
797 static int read_config_rom(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
798 u64 addr, size_t length, u16 fl)
799 {
800 u32 offset = addr - CSR1212_REGISTER_SPACE_BASE;
801
802 if (csr1212_read(host->csr.rom, offset, buffer, length) == CSR1212_SUCCESS)
803 return RCODE_COMPLETE;
804 else
805 return RCODE_ADDRESS_ERROR;
806 }
807
808 static u64 allocate_addr_range(u64 size, u32 alignment, void *__host)
809 {
810 struct hpsb_host *host = (struct hpsb_host*)__host;
811
812 return hpsb_allocate_and_register_addrspace(&csr_highlevel,
813 host,
814 &config_rom_ops,
815 size, alignment,
816 CSR1212_UNITS_SPACE_BASE,
817 CSR1212_UNITS_SPACE_END);
818 }
819
820 static void release_addr_range(u64 addr, void *__host)
821 {
822 struct hpsb_host *host = (struct hpsb_host*)__host;
823 hpsb_unregister_addrspace(&csr_highlevel, host, addr);
824 }
825
826
827 int init_csr(void)
828 {
829 node_cap = csr1212_new_immediate(CSR1212_KV_ID_NODE_CAPABILITIES, 0x0083c0);
830 if (!node_cap) {
831 HPSB_ERR("Failed to allocate memory for Node Capabilties ConfigROM entry!");
832 return -ENOMEM;
833 }
834
835 hpsb_register_highlevel(&csr_highlevel);
836
837 return 0;
838 }
839
840 void cleanup_csr(void)
841 {
842 if (node_cap)
843 csr1212_release_keyval(node_cap);
844 hpsb_unregister_highlevel(&csr_highlevel);
845 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree