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1// SPDX-License-Identifier: GPL-2.0
2
3/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
4 * Copyright (C) 2019-2024 Linaro Ltd.
5 */
6
7#include <linux/bitfield.h>
8#include <linux/bits.h>
9#include <linux/device.h>
10#include <linux/dma-direction.h>
11#include <linux/types.h>
12
13#include "gsi.h"
14#include "gsi_trans.h"
15#include "ipa.h"
16#include "ipa_cmd.h"
17#include "ipa_endpoint.h"
18#include "ipa_mem.h"
19#include "ipa_reg.h"
20#include "ipa_table.h"
21
22/**
23 * DOC: IPA Immediate Commands
24 *
25 * The AP command TX endpoint is used to issue immediate commands to the IPA.
26 * An immediate command is generally used to request the IPA do something
27 * other than data transfer to another endpoint.
28 *
29 * Immediate commands are represented by GSI transactions just like other
30 * transfer requests, and use a single GSI TRE. Each immediate command
31 * has a well-defined format, having a payload of a known length. This
32 * allows the transfer element's length field to be used to hold an
33 * immediate command's opcode. The payload for a command resides in AP
34 * memory and is described by a single scatterlist entry in its transaction.
35 * Commands do not require a transaction completion callback, and are
36 * always issued using gsi_trans_commit_wait().
37 */
38
39/* Some commands can wait until indicated pipeline stages are clear */
40enum pipeline_clear_options {
41 pipeline_clear_hps = 0x0,
42 pipeline_clear_src_grp = 0x1,
43 pipeline_clear_full = 0x2,
44};
45
46/* IPA_CMD_IP_V{4,6}_{FILTER,ROUTING}_INIT */
47
48struct 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
62struct 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+, the pipeline clear options are encoded in the opcode */
75#define REGISTER_WRITE_OPCODE_SKIP_CLEAR_FMASK GENMASK(8, 8)
76#define REGISTER_WRITE_OPCODE_CLEAR_OPTION_FMASK GENMASK(10, 9)
77
78struct ipa_cmd_register_write {
79 __le16 flags; /* Unused/reserved prior to IPA v4.0 */
80 __le16 offset;
81 __le32 value;
82 __le32 value_mask;
83 __le32 clear_options; /* Unused/reserved for IPA v4.0+ */
84};
85
86/* Field masks for ipa_cmd_register_write structure fields */
87/* The next field is present for IPA v4.0+ */
88#define REGISTER_WRITE_FLAGS_OFFSET_HIGH_FMASK GENMASK(14, 11)
89/* The next field is not present for IPA v4.0+ */
90#define REGISTER_WRITE_FLAGS_SKIP_CLEAR_FMASK GENMASK(15, 15)
91
92/* The next field and its values are not present for IPA v4.0+ */
93#define REGISTER_WRITE_CLEAR_OPTIONS_FMASK GENMASK(1, 0)
94
95/* IPA_CMD_IP_PACKET_INIT */
96
97struct ipa_cmd_ip_packet_init {
98 u8 dest_endpoint; /* Full 8 bits used for IPA v5.0+ */
99 u8 reserved[7];
100};
101
102/* Field mask for ipa_cmd_ip_packet_init dest_endpoint field (unused v5.0+) */
103#define IPA_PACKET_INIT_DEST_ENDPOINT_FMASK GENMASK(4, 0)
104
105/* IPA_CMD_DMA_SHARED_MEM */
106
107/* For IPA v4.0+, this opcode gets modified with pipeline clear options */
108
109#define DMA_SHARED_MEM_OPCODE_SKIP_CLEAR_FMASK GENMASK(8, 8)
110#define DMA_SHARED_MEM_OPCODE_CLEAR_OPTION_FMASK GENMASK(10, 9)
111
112struct ipa_cmd_hw_dma_mem_mem {
113 __le16 clear_after_read; /* 0 or DMA_SHARED_MEM_CLEAR_AFTER_READ */
114 __le16 size;
115 __le16 local_addr;
116 __le16 flags;
117 __le64 system_addr;
118};
119
120/* Flag allowing atomic clear of target region after reading data (v4.0+)*/
121#define DMA_SHARED_MEM_CLEAR_AFTER_READ GENMASK(15, 15)
122
123/* Field masks for ipa_cmd_hw_dma_mem_mem structure fields */
124#define DMA_SHARED_MEM_FLAGS_DIRECTION_FMASK GENMASK(0, 0)
125/* The next two fields are not present for IPA v4.0+ */
126#define DMA_SHARED_MEM_FLAGS_SKIP_CLEAR_FMASK GENMASK(1, 1)
127#define DMA_SHARED_MEM_FLAGS_CLEAR_OPTIONS_FMASK GENMASK(3, 2)
128
129/* IPA_CMD_IP_PACKET_TAG_STATUS */
130
131struct ipa_cmd_ip_packet_tag_status {
132 __le64 tag;
133};
134
135#define IP_PACKET_TAG_STATUS_TAG_FMASK GENMASK_ULL(63, 16)
136
137/* Immediate command payload */
138union ipa_cmd_payload {
139 struct ipa_cmd_hw_ip_fltrt_init table_init;
140 struct ipa_cmd_hw_hdr_init_local hdr_init_local;
141 struct ipa_cmd_register_write register_write;
142 struct ipa_cmd_ip_packet_init ip_packet_init;
143 struct ipa_cmd_hw_dma_mem_mem dma_shared_mem;
144 struct ipa_cmd_ip_packet_tag_status ip_packet_tag_status;
145};
146
147static void ipa_cmd_validate_build(void)
148{
149 /* The size of a filter table needs to fit into fields in the
150 * ipa_cmd_hw_ip_fltrt_init structure. Although hashed tables
151 * might not be used, non-hashed and hashed tables have the same
152 * maximum size. IPv4 and IPv6 filter tables have the same number
153 * of entries.
154 */
155 /* Hashed and non-hashed fields are assumed to be the same size */
156 BUILD_BUG_ON(field_max(IP_FLTRT_FLAGS_HASH_SIZE_FMASK) !=
157 field_max(IP_FLTRT_FLAGS_NHASH_SIZE_FMASK));
158 BUILD_BUG_ON(field_max(IP_FLTRT_FLAGS_HASH_ADDR_FMASK) !=
159 field_max(IP_FLTRT_FLAGS_NHASH_ADDR_FMASK));
160
161 /* Prior to IPA v5.0, we supported no more than 32 endpoints,
162 * and this was reflected in some 5-bit fields that held
163 * endpoint numbers. Starting with IPA v5.0, the widths of
164 * these fields were extended to 8 bits, meaning up to 256
165 * endpoints. If the driver claims to support more than
166 * that it's an error.
167 */
168 BUILD_BUG_ON(IPA_ENDPOINT_MAX - 1 > U8_MAX);
169}
170
171/* Validate a memory region holding a table */
172bool ipa_cmd_table_init_valid(struct ipa *ipa, const struct ipa_mem *mem,
173 bool route)
174{
175 u32 offset_max = field_max(IP_FLTRT_FLAGS_NHASH_ADDR_FMASK);
176 u32 size_max = field_max(IP_FLTRT_FLAGS_NHASH_SIZE_FMASK);
177 const char *table = route ? "route" : "filter";
178 struct device *dev = ipa->dev;
179 u32 size;
180
181 size = route ? ipa->route_count : ipa->filter_count + 1;
182 size *= sizeof(__le64);
183
184 /* Size must fit in the immediate command field that holds it */
185 if (size > size_max) {
186 dev_err(dev, "%s table region size too large\n", table);
187 dev_err(dev, " (0x%04x > 0x%04x)\n", size, size_max);
188
189 return false;
190 }
191
192 /* Offset must fit in the immediate command field that holds it */
193 if (mem->offset > offset_max ||
194 ipa->mem_offset > offset_max - mem->offset) {
195 dev_err(dev, "%s table region offset too large\n", table);
196 dev_err(dev, " (0x%04x + 0x%04x > 0x%04x)\n",
197 ipa->mem_offset, mem->offset, offset_max);
198
199 return false;
200 }
201
202 return true;
203}
204
205/* Validate the memory region that holds headers */
206static bool ipa_cmd_header_init_local_valid(struct ipa *ipa)
207{
208 struct device *dev = ipa->dev;
209 const struct ipa_mem *mem;
210 u32 offset_max;
211 u32 size_max;
212 u32 offset;
213 u32 size;
214
215 /* In ipa_cmd_hdr_init_local_add() we record the offset and size of
216 * the header table memory area in an immediate command. Make sure
217 * the offset and size fit in the fields that need to hold them, and
218 * that the entire range is within the overall IPA memory range.
219 */
220 offset_max = field_max(HDR_INIT_LOCAL_FLAGS_HDR_ADDR_FMASK);
221 size_max = field_max(HDR_INIT_LOCAL_FLAGS_TABLE_SIZE_FMASK);
222
223 /* The header memory area contains both the modem and AP header
224 * regions. The modem portion defines the address of the region.
225 */
226 mem = ipa_mem_find(ipa, mem_id: IPA_MEM_MODEM_HEADER);
227 offset = mem->offset;
228 size = mem->size;
229
230 /* Make sure the offset fits in the IPA command */
231 if (offset > offset_max || ipa->mem_offset > offset_max - offset) {
232 dev_err(dev, "header table region offset too large\n");
233 dev_err(dev, " (0x%04x + 0x%04x > 0x%04x)\n",
234 ipa->mem_offset, offset, offset_max);
235
236 return false;
237 }
238
239 /* Add the size of the AP portion (if defined) to the combined size */
240 mem = ipa_mem_find(ipa, mem_id: IPA_MEM_AP_HEADER);
241 if (mem)
242 size += mem->size;
243
244 /* Make sure the combined size fits in the IPA command */
245 if (size > size_max) {
246 dev_err(dev, "header table region size too large\n");
247 dev_err(dev, " (0x%04x > 0x%08x)\n", size, size_max);
248
249 return false;
250 }
251
252 return true;
253}
254
255/* Indicate whether an offset can be used with a register_write command */
256static bool ipa_cmd_register_write_offset_valid(struct ipa *ipa,
257 const char *name, u32 offset)
258{
259 struct ipa_cmd_register_write *payload;
260 struct device *dev = ipa->dev;
261 u32 offset_max;
262 u32 bit_count;
263
264 /* The maximum offset in a register_write immediate command depends
265 * on the version of IPA. A 16 bit offset is always supported,
266 * but starting with IPA v4.0 some additional high-order bits are
267 * allowed.
268 */
269 bit_count = BITS_PER_BYTE * sizeof(payload->offset);
270 if (ipa->version >= IPA_VERSION_4_0)
271 bit_count += hweight32(REGISTER_WRITE_FLAGS_OFFSET_HIGH_FMASK);
272 BUILD_BUG_ON(bit_count > 32);
273 offset_max = ~0U >> (32 - bit_count);
274
275 /* Make sure the offset can be represented by the field(s)
276 * that holds it. Also make sure the offset is not outside
277 * the overall IPA memory range.
278 */
279 if (offset > offset_max || ipa->mem_offset > offset_max - offset) {
280 dev_err(dev, "%s offset too large 0x%04x + 0x%04x > 0x%04x)\n",
281 name, ipa->mem_offset, offset, offset_max);
282 return false;
283 }
284
285 return true;
286}
287
288/* Check whether offsets passed to register_write are valid */
289static bool ipa_cmd_register_write_valid(struct ipa *ipa)
290{
291 const struct reg *reg;
292 const char *name;
293 u32 offset;
294
295 /* If hashed tables are supported, ensure the hash flush register
296 * offset will fit in a register write IPA immediate command.
297 */
298 if (ipa_table_hash_support(ipa)) {
299 if (ipa->version < IPA_VERSION_5_0)
300 reg = ipa_reg(ipa, reg_id: FILT_ROUT_HASH_FLUSH);
301 else
302 reg = ipa_reg(ipa, reg_id: FILT_ROUT_CACHE_FLUSH);
303
304 offset = reg_offset(reg);
305 name = "filter/route hash flush";
306 if (!ipa_cmd_register_write_offset_valid(ipa, name, offset))
307 return false;
308 }
309
310 /* Each endpoint can have a status endpoint associated with it,
311 * and this is recorded in an endpoint register. If the modem
312 * crashes, we reset the status endpoint for all modem endpoints
313 * using a register write IPA immediate command. Make sure the
314 * worst case (highest endpoint number) offset of that endpoint
315 * fits in the register write command field(s) that must hold it.
316 */
317 reg = ipa_reg(ipa, reg_id: ENDP_STATUS);
318 offset = reg_n_offset(reg, n: IPA_ENDPOINT_COUNT - 1);
319 name = "maximal endpoint status";
320 if (!ipa_cmd_register_write_offset_valid(ipa, name, offset))
321 return false;
322
323 return true;
324}
325
326int ipa_cmd_pool_init(struct gsi_channel *channel, u32 tre_max)
327{
328 struct gsi_trans_info *trans_info = &channel->trans_info;
329 struct device *dev = channel->gsi->dev;
330
331 /* Command payloads are allocated one at a time, but a single
332 * transaction can require up to the maximum supported by the
333 * channel; treat them as if they were allocated all at once.
334 */
335 return gsi_trans_pool_init_dma(dev, pool: &trans_info->cmd_pool,
336 size: sizeof(union ipa_cmd_payload),
337 count: tre_max, max_alloc: channel->trans_tre_max);
338}
339
340void ipa_cmd_pool_exit(struct gsi_channel *channel)
341{
342 struct gsi_trans_info *trans_info = &channel->trans_info;
343 struct device *dev = channel->gsi->dev;
344
345 gsi_trans_pool_exit_dma(dev, pool: &trans_info->cmd_pool);
346}
347
348static union ipa_cmd_payload *
349ipa_cmd_payload_alloc(struct ipa *ipa, dma_addr_t *addr)
350{
351 struct gsi_trans_info *trans_info;
352 struct ipa_endpoint *endpoint;
353
354 endpoint = ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX];
355 trans_info = &ipa->gsi.channel[endpoint->channel_id].trans_info;
356
357 return gsi_trans_pool_alloc_dma(pool: &trans_info->cmd_pool, addr);
358}
359
360/* If hash_size is 0, hash_offset and hash_addr ignored. */
361void ipa_cmd_table_init_add(struct gsi_trans *trans,
362 enum ipa_cmd_opcode opcode, u16 size, u32 offset,
363 dma_addr_t addr, u16 hash_size, u32 hash_offset,
364 dma_addr_t hash_addr)
365{
366 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
367 struct ipa_cmd_hw_ip_fltrt_init *payload;
368 union ipa_cmd_payload *cmd_payload;
369 dma_addr_t payload_addr;
370 u64 val;
371
372 /* Record the non-hash table offset and size */
373 offset += ipa->mem_offset;
374 val = u64_encode_bits(v: offset, IP_FLTRT_FLAGS_NHASH_ADDR_FMASK);
375 val |= u64_encode_bits(v: size, IP_FLTRT_FLAGS_NHASH_SIZE_FMASK);
376
377 /* The hash table offset and address are zero if its size is 0 */
378 if (hash_size) {
379 /* Record the hash table offset and size */
380 hash_offset += ipa->mem_offset;
381 val |= u64_encode_bits(v: hash_offset,
382 IP_FLTRT_FLAGS_HASH_ADDR_FMASK);
383 val |= u64_encode_bits(v: hash_size,
384 IP_FLTRT_FLAGS_HASH_SIZE_FMASK);
385 }
386
387 cmd_payload = ipa_cmd_payload_alloc(ipa, addr: &payload_addr);
388 payload = &cmd_payload->table_init;
389
390 /* Fill in all offsets and sizes and the non-hash table address */
391 if (hash_size)
392 payload->hash_rules_addr = cpu_to_le64(hash_addr);
393 payload->flags = cpu_to_le64(val);
394 payload->nhash_rules_addr = cpu_to_le64(addr);
395
396 gsi_trans_cmd_add(trans, buf: payload, size: sizeof(*payload), addr: payload_addr,
397 opcode);
398}
399
400/* Initialize header space in IPA-local memory */
401void ipa_cmd_hdr_init_local_add(struct gsi_trans *trans, u32 offset, u16 size,
402 dma_addr_t addr)
403{
404 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
405 enum ipa_cmd_opcode opcode = IPA_CMD_HDR_INIT_LOCAL;
406 struct ipa_cmd_hw_hdr_init_local *payload;
407 union ipa_cmd_payload *cmd_payload;
408 dma_addr_t payload_addr;
409 u32 flags;
410
411 offset += ipa->mem_offset;
412
413 /* With this command we tell the IPA where in its local memory the
414 * header tables reside. The content of the buffer provided is
415 * also written via DMA into that space. The IPA hardware owns
416 * the table, but the AP must initialize it.
417 */
418 cmd_payload = ipa_cmd_payload_alloc(ipa, addr: &payload_addr);
419 payload = &cmd_payload->hdr_init_local;
420
421 payload->hdr_table_addr = cpu_to_le64(addr);
422 flags = u32_encode_bits(v: size, HDR_INIT_LOCAL_FLAGS_TABLE_SIZE_FMASK);
423 flags |= u32_encode_bits(v: offset, HDR_INIT_LOCAL_FLAGS_HDR_ADDR_FMASK);
424 payload->flags = cpu_to_le32(flags);
425
426 gsi_trans_cmd_add(trans, buf: payload, size: sizeof(*payload), addr: payload_addr,
427 opcode);
428}
429
430void ipa_cmd_register_write_add(struct gsi_trans *trans, u32 offset, u32 value,
431 u32 mask, bool clear_full)
432{
433 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
434 struct ipa_cmd_register_write *payload;
435 union ipa_cmd_payload *cmd_payload;
436 u32 opcode = IPA_CMD_REGISTER_WRITE;
437 dma_addr_t payload_addr;
438 u32 clear_option;
439 u32 options;
440 u16 flags;
441
442 /* pipeline_clear_src_grp is not used */
443 clear_option = clear_full ? pipeline_clear_full : pipeline_clear_hps;
444
445 /* IPA v4.0+ represents the pipeline clear options in the opcode. It
446 * also supports a larger offset by encoding additional high-order
447 * bits in the payload flags field.
448 */
449 if (ipa->version >= IPA_VERSION_4_0) {
450 u16 offset_high;
451 u32 val;
452
453 /* Opcode encodes pipeline clear options */
454 /* SKIP_CLEAR is always 0 (don't skip pipeline clear) */
455 val = u16_encode_bits(v: clear_option,
456 REGISTER_WRITE_OPCODE_CLEAR_OPTION_FMASK);
457 opcode |= val;
458
459 /* Extract the high 4 bits from the offset */
460 offset_high = (u16)u32_get_bits(v: offset, GENMASK(19, 16));
461 offset &= (1 << 16) - 1;
462
463 /* Extract the top 4 bits and encode it into the flags field */
464 flags = u16_encode_bits(v: offset_high,
465 REGISTER_WRITE_FLAGS_OFFSET_HIGH_FMASK);
466 options = 0; /* reserved */
467
468 } else {
469 flags = 0; /* SKIP_CLEAR flag is always 0 */
470 options = u16_encode_bits(v: clear_option,
471 REGISTER_WRITE_CLEAR_OPTIONS_FMASK);
472 }
473
474 cmd_payload = ipa_cmd_payload_alloc(ipa, addr: &payload_addr);
475 payload = &cmd_payload->register_write;
476
477 payload->flags = cpu_to_le16(flags);
478 payload->offset = cpu_to_le16((u16)offset);
479 payload->value = cpu_to_le32(value);
480 payload->value_mask = cpu_to_le32(mask);
481 payload->clear_options = cpu_to_le32(options);
482
483 gsi_trans_cmd_add(trans, buf: payload, size: sizeof(*payload), addr: payload_addr,
484 opcode);
485}
486
487/* Skip IP packet processing on the next data transfer on a TX channel */
488static void ipa_cmd_ip_packet_init_add(struct gsi_trans *trans, u8 endpoint_id)
489{
490 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
491 enum ipa_cmd_opcode opcode = IPA_CMD_IP_PACKET_INIT;
492 struct ipa_cmd_ip_packet_init *payload;
493 union ipa_cmd_payload *cmd_payload;
494 dma_addr_t payload_addr;
495
496 cmd_payload = ipa_cmd_payload_alloc(ipa, addr: &payload_addr);
497 payload = &cmd_payload->ip_packet_init;
498
499 if (ipa->version < IPA_VERSION_5_0) {
500 payload->dest_endpoint =
501 u8_encode_bits(v: endpoint_id,
502 IPA_PACKET_INIT_DEST_ENDPOINT_FMASK);
503 } else {
504 payload->dest_endpoint = endpoint_id;
505 }
506
507 gsi_trans_cmd_add(trans, buf: payload, size: sizeof(*payload), addr: payload_addr,
508 opcode);
509}
510
511/* Use a DMA command to read or write a block of IPA-resident memory */
512void ipa_cmd_dma_shared_mem_add(struct gsi_trans *trans, u32 offset, u16 size,
513 dma_addr_t addr, bool toward_ipa)
514{
515 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
516 enum ipa_cmd_opcode opcode = IPA_CMD_DMA_SHARED_MEM;
517 struct ipa_cmd_hw_dma_mem_mem *payload;
518 union ipa_cmd_payload *cmd_payload;
519 dma_addr_t payload_addr;
520 u16 flags;
521
522 /* size and offset must fit in 16 bit fields */
523 WARN_ON(!size);
524 WARN_ON(size > U16_MAX);
525 WARN_ON(offset > U16_MAX || ipa->mem_offset > U16_MAX - offset);
526
527 offset += ipa->mem_offset;
528
529 cmd_payload = ipa_cmd_payload_alloc(ipa, addr: &payload_addr);
530 payload = &cmd_payload->dma_shared_mem;
531
532 /* payload->clear_after_read was reserved prior to IPA v4.0. It's
533 * never needed for current code, so it's 0 regardless of version.
534 */
535 payload->size = cpu_to_le16(size);
536 payload->local_addr = cpu_to_le16(offset);
537 /* payload->flags:
538 * direction: 0 = write to IPA, 1 read from IPA
539 * Starting at v4.0 these are reserved; either way, all zero:
540 * pipeline clear: 0 = wait for pipeline clear (don't skip)
541 * clear_options: 0 = pipeline_clear_hps
542 * Instead, for v4.0+ these are encoded in the opcode. But again
543 * since both values are 0 we won't bother OR'ing them in.
544 */
545 flags = toward_ipa ? 0 : DMA_SHARED_MEM_FLAGS_DIRECTION_FMASK;
546 payload->flags = cpu_to_le16(flags);
547 payload->system_addr = cpu_to_le64(addr);
548
549 gsi_trans_cmd_add(trans, buf: payload, size: sizeof(*payload), addr: payload_addr,
550 opcode);
551}
552
553static void ipa_cmd_ip_tag_status_add(struct gsi_trans *trans)
554{
555 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
556 enum ipa_cmd_opcode opcode = IPA_CMD_IP_PACKET_TAG_STATUS;
557 struct ipa_cmd_ip_packet_tag_status *payload;
558 union ipa_cmd_payload *cmd_payload;
559 dma_addr_t payload_addr;
560
561 cmd_payload = ipa_cmd_payload_alloc(ipa, addr: &payload_addr);
562 payload = &cmd_payload->ip_packet_tag_status;
563
564 payload->tag = le64_encode_bits(v: 0, IP_PACKET_TAG_STATUS_TAG_FMASK);
565
566 gsi_trans_cmd_add(trans, buf: payload, size: sizeof(*payload), addr: payload_addr,
567 opcode);
568}
569
570/* Issue a small command TX data transfer */
571static void ipa_cmd_transfer_add(struct gsi_trans *trans)
572{
573 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
574 enum ipa_cmd_opcode opcode = IPA_CMD_NONE;
575 union ipa_cmd_payload *payload;
576 dma_addr_t payload_addr;
577
578 /* Just transfer a zero-filled payload structure */
579 payload = ipa_cmd_payload_alloc(ipa, addr: &payload_addr);
580
581 gsi_trans_cmd_add(trans, buf: payload, size: sizeof(*payload), addr: payload_addr,
582 opcode);
583}
584
585/* Add immediate commands to a transaction to clear the hardware pipeline */
586void ipa_cmd_pipeline_clear_add(struct gsi_trans *trans)
587{
588 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
589 struct ipa_endpoint *endpoint;
590
591 /* This will complete when the transfer is received */
592 reinit_completion(x: &ipa->completion);
593
594 /* Issue a no-op register write command (mask 0 means no write) */
595 ipa_cmd_register_write_add(trans, offset: 0, value: 0, mask: 0, clear_full: true);
596
597 /* Send a data packet through the IPA pipeline. The packet_init
598 * command says to send the next packet directly to the exception
599 * endpoint without any other IPA processing. The tag_status
600 * command requests that status be generated on completion of
601 * that transfer, and that it will be tagged with a value.
602 * Finally, the transfer command sends a small packet of data
603 * (instead of a command) using the command endpoint.
604 */
605 endpoint = ipa->name_map[IPA_ENDPOINT_AP_LAN_RX];
606 ipa_cmd_ip_packet_init_add(trans, endpoint_id: endpoint->endpoint_id);
607 ipa_cmd_ip_tag_status_add(trans);
608 ipa_cmd_transfer_add(trans);
609}
610
611/* Returns the number of commands required to clear the pipeline */
612u32 ipa_cmd_pipeline_clear_count(void)
613{
614 return 4;
615}
616
617void ipa_cmd_pipeline_clear_wait(struct ipa *ipa)
618{
619 wait_for_completion(&ipa->completion);
620}
621
622/* Allocate a transaction for the command TX endpoint */
623struct gsi_trans *ipa_cmd_trans_alloc(struct ipa *ipa, u32 tre_count)
624{
625 struct ipa_endpoint *endpoint;
626
627 if (WARN_ON(tre_count > IPA_COMMAND_TRANS_TRE_MAX))
628 return NULL;
629
630 endpoint = ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX];
631
632 return gsi_channel_trans_alloc(gsi: &ipa->gsi, channel_id: endpoint->channel_id,
633 tre_count, direction: DMA_NONE);
634}
635
636/* Init function for immediate commands; there is no ipa_cmd_exit() */
637int ipa_cmd_init(struct ipa *ipa)
638{
639 ipa_cmd_validate_build();
640
641 if (!ipa_cmd_header_init_local_valid(ipa))
642 return -EINVAL;
643
644 if (!ipa_cmd_register_write_valid(ipa))
645 return -EINVAL;
646
647 return 0;
648}
649

source code of linux/drivers/net/ipa/ipa_cmd.c