1 // SPDX-License-Identifier: GPL-2.0
2
3 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
4 * Copyright (C) 2019-2021 Linaro Ltd.
5 */
6
7 #include <linux/types.h>
8 #include <linux/device.h>
9 #include <linux/slab.h>
10 #include <linux/bitfield.h>
11 #include <linux/dma-direction.h>
12
13 #include "gsi.h"
14 #include "gsi_trans.h"
15 #include "ipa.h"
16 #include "ipa_endpoint.h"
17 #include "ipa_table.h"
18 #include "ipa_cmd.h"
19 #include "ipa_mem.h"
20
21 /**
22 * DOC: IPA Immediate Commands
23 *
24 * The AP command TX endpoint is used to issue immediate commands to the IPA.
25 * An immediate command is generally used to request the IPA do something
26 * other than data transfer to another endpoint.
27 *
28 * Immediate commands are represented by GSI transactions just like other
29 * transfer requests, represented by a single GSI TRE. Each immediate
30 * command has a well-defined format, having a payload of a known length.
31 * This allows the transfer element's length field to be used to hold an
32 * immediate command's opcode. The payload for a command resides in DRAM
33 * and is described by a single scatterlist entry in its transaction.
34 * Commands do not require a transaction completion callback. To commit
35 * an immediate command transaction, either gsi_trans_commit_wait() or
36 * gsi_trans_commit_wait_timeout() is used.
37 */
38
39 /* Some commands can wait until indicated pipeline stages are clear */
40 enum pipeline_clear_options {
41 pipeline_clear_hps = 0,
42 pipeline_clear_src_grp = 1,
43 pipeline_clear_full = 2,
44 };
45
46 /* IPA_CMD_IP_V{4,6}_{FILTER,ROUTING}_INIT */
47
48 struct ipa_cmd_hw_ip_fltrt_init {
49 __le64 hash_rules_addr;
50 __le64 flags;
51 __le64 nhash_rules_addr;
52 };
53
54 /* Field masks for ipa_cmd_hw_ip_fltrt_init structure fields */
55 #define IP_FLTRT_FLAGS_HASH_SIZE_FMASK GENMASK_ULL(11, 0)
56 #define IP_FLTRT_FLAGS_HASH_ADDR_FMASK GENMASK_ULL(27, 12)
57 #define IP_FLTRT_FLAGS_NHASH_SIZE_FMASK GENMASK_ULL(39, 28)
58 #define IP_FLTRT_FLAGS_NHASH_ADDR_FMASK GENMASK_ULL(55, 40)
59
60 /* IPA_CMD_HDR_INIT_LOCAL */
61
62 struct ipa_cmd_hw_hdr_init_local {
63 __le64 hdr_table_addr;
64 __le32 flags;
65 __le32 reserved;
66 };
67
68 /* Field masks for ipa_cmd_hw_hdr_init_local structure fields */
69 #define HDR_INIT_LOCAL_FLAGS_TABLE_SIZE_FMASK GENMASK(11, 0)
70 #define HDR_INIT_LOCAL_FLAGS_HDR_ADDR_FMASK GENMASK(27, 12)
71
72 /* IPA_CMD_REGISTER_WRITE */
73
74 /* For IPA v4.0+, this opcode gets modified with pipeline clear options */
75
76 #define REGISTER_WRITE_OPCODE_SKIP_CLEAR_FMASK GENMASK(8, 8)
77 #define REGISTER_WRITE_OPCODE_CLEAR_OPTION_FMASK GENMASK(10, 9)
78
79 struct ipa_cmd_register_write {
80 __le16 flags; /* Unused/reserved for IPA v3.5.1 */
81 __le16 offset;
82 __le32 value;
83 __le32 value_mask;
84 __le32 clear_options; /* Unused/reserved for IPA v4.0+ */
85 };
86
87 /* Field masks for ipa_cmd_register_write structure fields */
88 /* The next field is present for IPA v4.0 and above */
89 #define REGISTER_WRITE_FLAGS_OFFSET_HIGH_FMASK GENMASK(14, 11)
90 /* The next field is present for IPA v3.5.1 only */
91 #define REGISTER_WRITE_FLAGS_SKIP_CLEAR_FMASK GENMASK(15, 15)
92
93 /* The next field and its values are present for IPA v3.5.1 only */
94 #define REGISTER_WRITE_CLEAR_OPTIONS_FMASK GENMASK(1, 0)
95
96 /* IPA_CMD_IP_PACKET_INIT */
97
98 struct ipa_cmd_ip_packet_init {
99 u8 dest_endpoint;
100 u8 reserved[7];
101 };
102
103 /* Field masks for ipa_cmd_ip_packet_init dest_endpoint field */
104 #define IPA_PACKET_INIT_DEST_ENDPOINT_FMASK GENMASK(4, 0)
105
106 /* IPA_CMD_DMA_SHARED_MEM */
107
108 /* For IPA v4.0+, this opcode gets modified with pipeline clear options */
109
110 #define DMA_SHARED_MEM_OPCODE_SKIP_CLEAR_FMASK GENMASK(8, 8)
111 #define DMA_SHARED_MEM_OPCODE_CLEAR_OPTION_FMASK GENMASK(10, 9)
112
113 struct ipa_cmd_hw_dma_mem_mem {
114 __le16 clear_after_read; /* 0 or DMA_SHARED_MEM_CLEAR_AFTER_READ */
115 __le16 size;
116 __le16 local_addr;
117 __le16 flags;
118 __le64 system_addr;
119 };
120
121 /* Flag allowing atomic clear of target region after reading data (v4.0+)*/
122 #define DMA_SHARED_MEM_CLEAR_AFTER_READ GENMASK(15, 15)
123
124 /* Field masks for ipa_cmd_hw_dma_mem_mem structure fields */
125 #define DMA_SHARED_MEM_FLAGS_DIRECTION_FMASK GENMASK(0, 0)
126 /* The next two fields are present for IPA v3.5.1 only. */
127 #define DMA_SHARED_MEM_FLAGS_SKIP_CLEAR_FMASK GENMASK(1, 1)
128 #define DMA_SHARED_MEM_FLAGS_CLEAR_OPTIONS_FMASK GENMASK(3, 2)
129
130 /* IPA_CMD_IP_PACKET_TAG_STATUS */
131
132 struct ipa_cmd_ip_packet_tag_status {
133 __le64 tag;
134 };
135
136 #define IP_PACKET_TAG_STATUS_TAG_FMASK GENMASK_ULL(63, 16)
137
138 /* Immediate command payload */
139 union ipa_cmd_payload {
140 struct ipa_cmd_hw_ip_fltrt_init table_init;
141 struct ipa_cmd_hw_hdr_init_local hdr_init_local;
142 struct ipa_cmd_register_write register_write;
143 struct ipa_cmd_ip_packet_init ip_packet_init;
144 struct ipa_cmd_hw_dma_mem_mem dma_shared_mem;
145 struct ipa_cmd_ip_packet_tag_status ip_packet_tag_status;
146 };
147
ipa_cmd_validate_build(void)148 static void ipa_cmd_validate_build(void)
149 {
150 /* The sizes of a filter and route tables need to fit into fields
151 * in the ipa_cmd_hw_ip_fltrt_init structure. Although hashed tables
152 * might not be used, non-hashed and hashed tables have the same
153 * maximum size. IPv4 and IPv6 filter tables have the same number
154 * of entries, as and IPv4 and IPv6 route tables have the same number
155 * of entries.
156 */
157 #define TABLE_SIZE (TABLE_COUNT_MAX * sizeof(__le64))
158 #define TABLE_COUNT_MAX max_t(u32, IPA_ROUTE_COUNT_MAX, IPA_FILTER_COUNT_MAX)
159 BUILD_BUG_ON(TABLE_SIZE > field_max(IP_FLTRT_FLAGS_HASH_SIZE_FMASK));
160 BUILD_BUG_ON(TABLE_SIZE > field_max(IP_FLTRT_FLAGS_NHASH_SIZE_FMASK));
161 #undef TABLE_COUNT_MAX
162 #undef TABLE_SIZE
163 }
164
165 #ifdef IPA_VALIDATE
166
167 /* Validate a memory region holding a table */
ipa_cmd_table_valid(struct ipa * ipa,const struct ipa_mem * mem,bool route,bool ipv6,bool hashed)168 bool ipa_cmd_table_valid(struct ipa *ipa, const struct ipa_mem *mem,
169 bool route, bool ipv6, bool hashed)
170 {
171 struct device *dev = &ipa->pdev->dev;
172 u32 offset_max;
173
174 offset_max = hashed ? field_max(IP_FLTRT_FLAGS_HASH_ADDR_FMASK)
175 : field_max(IP_FLTRT_FLAGS_NHASH_ADDR_FMASK);
176 if (mem->offset > offset_max ||
177 ipa->mem_offset > offset_max - mem->offset) {
178 dev_err(dev, "IPv%c %s%s table region offset too large\n",
179 ipv6 ? '6' : '4', hashed ? "hashed " : "",
180 route ? "route" : "filter");
181 dev_err(dev, " (0x%04x + 0x%04x > 0x%04x)\n",
182 ipa->mem_offset, mem->offset, offset_max);
183
184 return false;
185 }
186
187 if (mem->offset > ipa->mem_size ||
188 mem->size > ipa->mem_size - mem->offset) {
189 dev_err(dev, "IPv%c %s%s table region out of range\n",
190 ipv6 ? '6' : '4', hashed ? "hashed " : "",
191 route ? "route" : "filter");
192 dev_err(dev, " (0x%04x + 0x%04x > 0x%04x)\n",
193 mem->offset, mem->size, ipa->mem_size);
194
195 return false;
196 }
197
198 return true;
199 }
200
201 /* Validate the memory region that holds headers */
ipa_cmd_header_valid(struct ipa * ipa)202 static bool ipa_cmd_header_valid(struct ipa *ipa)
203 {
204 const struct ipa_mem *mem = &ipa->mem[IPA_MEM_MODEM_HEADER];
205 struct device *dev = &ipa->pdev->dev;
206 u32 offset_max;
207 u32 size_max;
208 u32 size;
209
210 /* In ipa_cmd_hdr_init_local_add() we record the offset and size
211 * of the header table memory area. Make sure the offset and size
212 * fit in the fields that need to hold them, and that the entire
213 * range is within the overall IPA memory range.
214 */
215 offset_max = field_max(HDR_INIT_LOCAL_FLAGS_HDR_ADDR_FMASK);
216 if (mem->offset > offset_max ||
217 ipa->mem_offset > offset_max - mem->offset) {
218 dev_err(dev, "header table region offset too large\n");
219 dev_err(dev, " (0x%04x + 0x%04x > 0x%04x)\n",
220 ipa->mem_offset, mem->offset, offset_max);
221
222 return false;
223 }
224
225 size_max = field_max(HDR_INIT_LOCAL_FLAGS_TABLE_SIZE_FMASK);
226 size = ipa->mem[IPA_MEM_MODEM_HEADER].size;
227 size += ipa->mem[IPA_MEM_AP_HEADER].size;
228
229 if (size > size_max) {
230 dev_err(dev, "header table region size too large\n");
231 dev_err(dev, " (0x%04x > 0x%08x)\n", size, size_max);
232
233 return false;
234 }
235 if (size > ipa->mem_size || mem->offset > ipa->mem_size - size) {
236 dev_err(dev, "header table region out of range\n");
237 dev_err(dev, " (0x%04x + 0x%04x > 0x%04x)\n",
238 mem->offset, size, ipa->mem_size);
239
240 return false;
241 }
242
243 return true;
244 }
245
246 /* Indicate whether an offset can be used with a register_write command */
ipa_cmd_register_write_offset_valid(struct ipa * ipa,const char * name,u32 offset)247 static bool ipa_cmd_register_write_offset_valid(struct ipa *ipa,
248 const char *name, u32 offset)
249 {
250 struct ipa_cmd_register_write *payload;
251 struct device *dev = &ipa->pdev->dev;
252 u32 offset_max;
253 u32 bit_count;
254
255 /* The maximum offset in a register_write immediate command depends
256 * on the version of IPA. IPA v3.5.1 supports a 16 bit offset, but
257 * newer versions allow some additional high-order bits.
258 */
259 bit_count = BITS_PER_BYTE * sizeof(payload->offset);
260 if (ipa->version != IPA_VERSION_3_5_1)
261 bit_count += hweight32(REGISTER_WRITE_FLAGS_OFFSET_HIGH_FMASK);
262 BUILD_BUG_ON(bit_count > 32);
263 offset_max = ~0U >> (32 - bit_count);
264
265 /* Make sure the offset can be represented by the field(s)
266 * that holds it. Also make sure the offset is not outside
267 * the overall IPA memory range.
268 */
269 if (offset > offset_max || ipa->mem_offset > offset_max - offset) {
270 dev_err(dev, "%s offset too large 0x%04x + 0x%04x > 0x%04x)\n",
271 name, ipa->mem_offset, offset, offset_max);
272 return false;
273 }
274
275 return true;
276 }
277
278 /* Check whether offsets passed to register_write are valid */
ipa_cmd_register_write_valid(struct ipa * ipa)279 static bool ipa_cmd_register_write_valid(struct ipa *ipa)
280 {
281 const char *name;
282 u32 offset;
283
284 /* If hashed tables are supported, ensure the hash flush register
285 * offset will fit in a register write IPA immediate command.
286 */
287 if (ipa->version != IPA_VERSION_4_2) {
288 offset = ipa_reg_filt_rout_hash_flush_offset(ipa->version);
289 name = "filter/route hash flush";
290 if (!ipa_cmd_register_write_offset_valid(ipa, name, offset))
291 return false;
292 }
293
294 /* Each endpoint can have a status endpoint associated with it,
295 * and this is recorded in an endpoint register. If the modem
296 * crashes, we reset the status endpoint for all modem endpoints
297 * using a register write IPA immediate command. Make sure the
298 * worst case (highest endpoint number) offset of that endpoint
299 * fits in the register write command field(s) that must hold it.
300 */
301 offset = IPA_REG_ENDP_STATUS_N_OFFSET(IPA_ENDPOINT_COUNT - 1);
302 name = "maximal endpoint status";
303 if (!ipa_cmd_register_write_offset_valid(ipa, name, offset))
304 return false;
305
306 return true;
307 }
308
ipa_cmd_data_valid(struct ipa * ipa)309 bool ipa_cmd_data_valid(struct ipa *ipa)
310 {
311 if (!ipa_cmd_header_valid(ipa))
312 return false;
313
314 if (!ipa_cmd_register_write_valid(ipa))
315 return false;
316
317 return true;
318 }
319
320 #endif /* IPA_VALIDATE */
321
ipa_cmd_pool_init(struct gsi_channel * channel,u32 tre_max)322 int ipa_cmd_pool_init(struct gsi_channel *channel, u32 tre_max)
323 {
324 struct gsi_trans_info *trans_info = &channel->trans_info;
325 struct device *dev = channel->gsi->dev;
326 int ret;
327
328 /* This is as good a place as any to validate build constants */
329 ipa_cmd_validate_build();
330
331 /* Even though command payloads are allocated one at a time,
332 * a single transaction can require up to tlv_count of them,
333 * so we treat them as if that many can be allocated at once.
334 */
335 ret = gsi_trans_pool_init_dma(dev, &trans_info->cmd_pool,
336 sizeof(union ipa_cmd_payload),
337 tre_max, channel->tlv_count);
338 if (ret)
339 return ret;
340
341 /* Each TRE needs a command info structure */
342 ret = gsi_trans_pool_init(&trans_info->info_pool,
343 sizeof(struct ipa_cmd_info),
344 tre_max, channel->tlv_count);
345 if (ret)
346 gsi_trans_pool_exit_dma(dev, &trans_info->cmd_pool);
347
348 return ret;
349 }
350
ipa_cmd_pool_exit(struct gsi_channel * channel)351 void ipa_cmd_pool_exit(struct gsi_channel *channel)
352 {
353 struct gsi_trans_info *trans_info = &channel->trans_info;
354 struct device *dev = channel->gsi->dev;
355
356 gsi_trans_pool_exit(&trans_info->info_pool);
357 gsi_trans_pool_exit_dma(dev, &trans_info->cmd_pool);
358 }
359
360 static union ipa_cmd_payload *
ipa_cmd_payload_alloc(struct ipa * ipa,dma_addr_t * addr)361 ipa_cmd_payload_alloc(struct ipa *ipa, dma_addr_t *addr)
362 {
363 struct gsi_trans_info *trans_info;
364 struct ipa_endpoint *endpoint;
365
366 endpoint = ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX];
367 trans_info = &ipa->gsi.channel[endpoint->channel_id].trans_info;
368
369 return gsi_trans_pool_alloc_dma(&trans_info->cmd_pool, addr);
370 }
371
372 /* If hash_size is 0, hash_offset and hash_addr ignored. */
ipa_cmd_table_init_add(struct gsi_trans * trans,enum ipa_cmd_opcode opcode,u16 size,u32 offset,dma_addr_t addr,u16 hash_size,u32 hash_offset,dma_addr_t hash_addr)373 void ipa_cmd_table_init_add(struct gsi_trans *trans,
374 enum ipa_cmd_opcode opcode, u16 size, u32 offset,
375 dma_addr_t addr, u16 hash_size, u32 hash_offset,
376 dma_addr_t hash_addr)
377 {
378 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
379 enum dma_data_direction direction = DMA_TO_DEVICE;
380 struct ipa_cmd_hw_ip_fltrt_init *payload;
381 union ipa_cmd_payload *cmd_payload;
382 dma_addr_t payload_addr;
383 u64 val;
384
385 /* Record the non-hash table offset and size */
386 offset += ipa->mem_offset;
387 val = u64_encode_bits(offset, IP_FLTRT_FLAGS_NHASH_ADDR_FMASK);
388 val |= u64_encode_bits(size, IP_FLTRT_FLAGS_NHASH_SIZE_FMASK);
389
390 /* The hash table offset and address are zero if its size is 0 */
391 if (hash_size) {
392 /* Record the hash table offset and size */
393 hash_offset += ipa->mem_offset;
394 val |= u64_encode_bits(hash_offset,
395 IP_FLTRT_FLAGS_HASH_ADDR_FMASK);
396 val |= u64_encode_bits(hash_size,
397 IP_FLTRT_FLAGS_HASH_SIZE_FMASK);
398 }
399
400 cmd_payload = ipa_cmd_payload_alloc(ipa, &payload_addr);
401 payload = &cmd_payload->table_init;
402
403 /* Fill in all offsets and sizes and the non-hash table address */
404 if (hash_size)
405 payload->hash_rules_addr = cpu_to_le64(hash_addr);
406 payload->flags = cpu_to_le64(val);
407 payload->nhash_rules_addr = cpu_to_le64(addr);
408
409 gsi_trans_cmd_add(trans, payload, sizeof(*payload), payload_addr,
410 direction, opcode);
411 }
412
413 /* Initialize header space in IPA-local memory */
ipa_cmd_hdr_init_local_add(struct gsi_trans * trans,u32 offset,u16 size,dma_addr_t addr)414 void ipa_cmd_hdr_init_local_add(struct gsi_trans *trans, u32 offset, u16 size,
415 dma_addr_t addr)
416 {
417 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
418 enum ipa_cmd_opcode opcode = IPA_CMD_HDR_INIT_LOCAL;
419 enum dma_data_direction direction = DMA_TO_DEVICE;
420 struct ipa_cmd_hw_hdr_init_local *payload;
421 union ipa_cmd_payload *cmd_payload;
422 dma_addr_t payload_addr;
423 u32 flags;
424
425 offset += ipa->mem_offset;
426
427 /* With this command we tell the IPA where in its local memory the
428 * header tables reside. The content of the buffer provided is
429 * also written via DMA into that space. The IPA hardware owns
430 * the table, but the AP must initialize it.
431 */
432 cmd_payload = ipa_cmd_payload_alloc(ipa, &payload_addr);
433 payload = &cmd_payload->hdr_init_local;
434
435 payload->hdr_table_addr = cpu_to_le64(addr);
436 flags = u32_encode_bits(size, HDR_INIT_LOCAL_FLAGS_TABLE_SIZE_FMASK);
437 flags |= u32_encode_bits(offset, HDR_INIT_LOCAL_FLAGS_HDR_ADDR_FMASK);
438 payload->flags = cpu_to_le32(flags);
439
440 gsi_trans_cmd_add(trans, payload, sizeof(*payload), payload_addr,
441 direction, opcode);
442 }
443
ipa_cmd_register_write_add(struct gsi_trans * trans,u32 offset,u32 value,u32 mask,bool clear_full)444 void ipa_cmd_register_write_add(struct gsi_trans *trans, u32 offset, u32 value,
445 u32 mask, bool clear_full)
446 {
447 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
448 struct ipa_cmd_register_write *payload;
449 union ipa_cmd_payload *cmd_payload;
450 u32 opcode = IPA_CMD_REGISTER_WRITE;
451 dma_addr_t payload_addr;
452 u32 clear_option;
453 u32 options;
454 u16 flags;
455
456 /* pipeline_clear_src_grp is not used */
457 clear_option = clear_full ? pipeline_clear_full : pipeline_clear_hps;
458
459 if (ipa->version != IPA_VERSION_3_5_1) {
460 u16 offset_high;
461 u32 val;
462
463 /* Opcode encodes pipeline clear options */
464 /* SKIP_CLEAR is always 0 (don't skip pipeline clear) */
465 val = u16_encode_bits(clear_option,
466 REGISTER_WRITE_OPCODE_CLEAR_OPTION_FMASK);
467 opcode |= val;
468
469 /* Extract the high 4 bits from the offset */
470 offset_high = (u16)u32_get_bits(offset, GENMASK(19, 16));
471 offset &= (1 << 16) - 1;
472
473 /* Extract the top 4 bits and encode it into the flags field */
474 flags = u16_encode_bits(offset_high,
475 REGISTER_WRITE_FLAGS_OFFSET_HIGH_FMASK);
476 options = 0; /* reserved */
477
478 } else {
479 flags = 0; /* SKIP_CLEAR flag is always 0 */
480 options = u16_encode_bits(clear_option,
481 REGISTER_WRITE_CLEAR_OPTIONS_FMASK);
482 }
483
484 cmd_payload = ipa_cmd_payload_alloc(ipa, &payload_addr);
485 payload = &cmd_payload->register_write;
486
487 payload->flags = cpu_to_le16(flags);
488 payload->offset = cpu_to_le16((u16)offset);
489 payload->value = cpu_to_le32(value);
490 payload->value_mask = cpu_to_le32(mask);
491 payload->clear_options = cpu_to_le32(options);
492
493 gsi_trans_cmd_add(trans, payload, sizeof(*payload), payload_addr,
494 DMA_NONE, opcode);
495 }
496
497 /* Skip IP packet processing on the next data transfer on a TX channel */
ipa_cmd_ip_packet_init_add(struct gsi_trans * trans,u8 endpoint_id)498 static void ipa_cmd_ip_packet_init_add(struct gsi_trans *trans, u8 endpoint_id)
499 {
500 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
501 enum ipa_cmd_opcode opcode = IPA_CMD_IP_PACKET_INIT;
502 enum dma_data_direction direction = DMA_TO_DEVICE;
503 struct ipa_cmd_ip_packet_init *payload;
504 union ipa_cmd_payload *cmd_payload;
505 dma_addr_t payload_addr;
506
507 /* assert(endpoint_id <
508 field_max(IPA_PACKET_INIT_DEST_ENDPOINT_FMASK)); */
509
510 cmd_payload = ipa_cmd_payload_alloc(ipa, &payload_addr);
511 payload = &cmd_payload->ip_packet_init;
512
513 payload->dest_endpoint = u8_encode_bits(endpoint_id,
514 IPA_PACKET_INIT_DEST_ENDPOINT_FMASK);
515
516 gsi_trans_cmd_add(trans, payload, sizeof(*payload), payload_addr,
517 direction, opcode);
518 }
519
520 /* Use a DMA command to read or write a block of IPA-resident memory */
ipa_cmd_dma_shared_mem_add(struct gsi_trans * trans,u32 offset,u16 size,dma_addr_t addr,bool toward_ipa)521 void ipa_cmd_dma_shared_mem_add(struct gsi_trans *trans, u32 offset, u16 size,
522 dma_addr_t addr, bool toward_ipa)
523 {
524 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
525 enum ipa_cmd_opcode opcode = IPA_CMD_DMA_SHARED_MEM;
526 struct ipa_cmd_hw_dma_mem_mem *payload;
527 union ipa_cmd_payload *cmd_payload;
528 enum dma_data_direction direction;
529 dma_addr_t payload_addr;
530 u16 flags;
531
532 /* size and offset must fit in 16 bit fields */
533 /* assert(size > 0 && size <= U16_MAX); */
534 /* assert(offset <= U16_MAX && ipa->mem_offset <= U16_MAX - offset); */
535
536 offset += ipa->mem_offset;
537
538 cmd_payload = ipa_cmd_payload_alloc(ipa, &payload_addr);
539 payload = &cmd_payload->dma_shared_mem;
540
541 /* payload->clear_after_read was reserved prior to IPA v4.0. It's
542 * never needed for current code, so it's 0 regardless of version.
543 */
544 payload->size = cpu_to_le16(size);
545 payload->local_addr = cpu_to_le16(offset);
546 /* payload->flags:
547 * direction: 0 = write to IPA, 1 read from IPA
548 * Starting at v4.0 these are reserved; either way, all zero:
549 * pipeline clear: 0 = wait for pipeline clear (don't skip)
550 * clear_options: 0 = pipeline_clear_hps
551 * Instead, for v4.0+ these are encoded in the opcode. But again
552 * since both values are 0 we won't bother OR'ing them in.
553 */
554 flags = toward_ipa ? 0 : DMA_SHARED_MEM_FLAGS_DIRECTION_FMASK;
555 payload->flags = cpu_to_le16(flags);
556 payload->system_addr = cpu_to_le64(addr);
557
558 direction = toward_ipa ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
559
560 gsi_trans_cmd_add(trans, payload, sizeof(*payload), payload_addr,
561 direction, opcode);
562 }
563
ipa_cmd_ip_tag_status_add(struct gsi_trans * trans,u64 tag)564 static void ipa_cmd_ip_tag_status_add(struct gsi_trans *trans, u64 tag)
565 {
566 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
567 enum ipa_cmd_opcode opcode = IPA_CMD_IP_PACKET_TAG_STATUS;
568 enum dma_data_direction direction = DMA_TO_DEVICE;
569 struct ipa_cmd_ip_packet_tag_status *payload;
570 union ipa_cmd_payload *cmd_payload;
571 dma_addr_t payload_addr;
572
573 /* assert(tag <= field_max(IP_PACKET_TAG_STATUS_TAG_FMASK)); */
574
575 cmd_payload = ipa_cmd_payload_alloc(ipa, &payload_addr);
576 payload = &cmd_payload->ip_packet_tag_status;
577
578 payload->tag = u64_encode_bits(tag, IP_PACKET_TAG_STATUS_TAG_FMASK);
579
580 gsi_trans_cmd_add(trans, payload, sizeof(*payload), payload_addr,
581 direction, opcode);
582 }
583
584 /* Issue a small command TX data transfer */
ipa_cmd_transfer_add(struct gsi_trans * trans,u16 size)585 static void ipa_cmd_transfer_add(struct gsi_trans *trans, u16 size)
586 {
587 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
588 enum dma_data_direction direction = DMA_TO_DEVICE;
589 enum ipa_cmd_opcode opcode = IPA_CMD_NONE;
590 union ipa_cmd_payload *payload;
591 dma_addr_t payload_addr;
592
593 /* assert(size <= sizeof(*payload)); */
594
595 /* Just transfer a zero-filled payload structure */
596 payload = ipa_cmd_payload_alloc(ipa, &payload_addr);
597
598 gsi_trans_cmd_add(trans, payload, sizeof(*payload), payload_addr,
599 direction, opcode);
600 }
601
ipa_cmd_tag_process_add(struct gsi_trans * trans)602 void ipa_cmd_tag_process_add(struct gsi_trans *trans)
603 {
604 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
605 struct ipa_endpoint *endpoint;
606
607 endpoint = ipa->name_map[IPA_ENDPOINT_AP_LAN_RX];
608
609 ipa_cmd_register_write_add(trans, 0, 0, 0, true);
610 ipa_cmd_ip_packet_init_add(trans, endpoint->endpoint_id);
611 ipa_cmd_ip_tag_status_add(trans, 0xcba987654321);
612 ipa_cmd_transfer_add(trans, 4);
613 }
614
615 /* Returns the number of commands required for the tag process */
ipa_cmd_tag_process_count(void)616 u32 ipa_cmd_tag_process_count(void)
617 {
618 return 4;
619 }
620
ipa_cmd_tag_process(struct ipa * ipa)621 void ipa_cmd_tag_process(struct ipa *ipa)
622 {
623 u32 count = ipa_cmd_tag_process_count();
624 struct gsi_trans *trans;
625
626 trans = ipa_cmd_trans_alloc(ipa, count);
627 if (trans) {
628 ipa_cmd_tag_process_add(trans);
629 gsi_trans_commit_wait(trans);
630 } else {
631 dev_err(&ipa->pdev->dev,
632 "error allocating %u entry tag transaction\n", count);
633 }
634 }
635
636 static struct ipa_cmd_info *
ipa_cmd_info_alloc(struct ipa_endpoint * endpoint,u32 tre_count)637 ipa_cmd_info_alloc(struct ipa_endpoint *endpoint, u32 tre_count)
638 {
639 struct gsi_channel *channel;
640
641 channel = &endpoint->ipa->gsi.channel[endpoint->channel_id];
642
643 return gsi_trans_pool_alloc(&channel->trans_info.info_pool, tre_count);
644 }
645
646 /* Allocate a transaction for the command TX endpoint */
ipa_cmd_trans_alloc(struct ipa * ipa,u32 tre_count)647 struct gsi_trans *ipa_cmd_trans_alloc(struct ipa *ipa, u32 tre_count)
648 {
649 struct ipa_endpoint *endpoint;
650 struct gsi_trans *trans;
651
652 endpoint = ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX];
653
654 trans = gsi_channel_trans_alloc(&ipa->gsi, endpoint->channel_id,
655 tre_count, DMA_NONE);
656 if (trans)
657 trans->info = ipa_cmd_info_alloc(endpoint, tre_count);
658
659 return trans;
660 }
661