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1/******************************************************************************
2 *
3 * This file is provided under a dual BSD/GPLv2 license. When using or
4 * redistributing this file, you may do so under either license.
5 *
6 * GPL LICENSE SUMMARY
7 *
8 * Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
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29 * Intel Linux Wireless <linuxwifi@intel.com>
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33 *
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64 *****************************************************************************/
65#ifndef __iwl_trans_h__
66#define __iwl_trans_h__
67
68#include <linux/ieee80211.h>
69#include <linux/mm.h> /* for page_address */
70#include <linux/lockdep.h>
71#include <linux/kernel.h>
72
73#include "iwl-debug.h"
74#include "iwl-config.h"
75#include "iwl-fw.h"
76#include "iwl-op-mode.h"
77
78/**
79 * DOC: Transport layer - what is it ?
80 *
81 * The transport layer is the layer that deals with the HW directly. It provides
82 * an abstraction of the underlying HW to the upper layer. The transport layer
83 * doesn't provide any policy, algorithm or anything of this kind, but only
84 * mechanisms to make the HW do something. It is not completely stateless but
85 * close to it.
86 * We will have an implementation for each different supported bus.
87 */
88
89/**
90 * DOC: Life cycle of the transport layer
91 *
92 * The transport layer has a very precise life cycle.
93 *
94 * 1) A helper function is called during the module initialization and
95 * registers the bus driver's ops with the transport's alloc function.
96 * 2) Bus's probe calls to the transport layer's allocation functions.
97 * Of course this function is bus specific.
98 * 3) This allocation functions will spawn the upper layer which will
99 * register mac80211.
100 *
101 * 4) At some point (i.e. mac80211's start call), the op_mode will call
102 * the following sequence:
103 * start_hw
104 * start_fw
105 *
106 * 5) Then when finished (or reset):
107 * stop_device
108 *
109 * 6) Eventually, the free function will be called.
110 */
111
112/**
113 * DOC: Host command section
114 *
115 * A host command is a command issued by the upper layer to the fw. There are
116 * several versions of fw that have several APIs. The transport layer is
117 * completely agnostic to these differences.
118 * The transport does provide helper functionality (i.e. SYNC / ASYNC mode),
119 */
120#define SEQ_TO_QUEUE(s) (((s) >> 8) & 0x1f)
121#define QUEUE_TO_SEQ(q) (((q) & 0x1f) << 8)
122#define SEQ_TO_INDEX(s) ((s) & 0xff)
123#define INDEX_TO_SEQ(i) ((i) & 0xff)
124#define SEQ_RX_FRAME cpu_to_le16(0x8000)
125
126/*
127 * those functions retrieve specific information from
128 * the id field in the iwl_host_cmd struct which contains
129 * the command id, the group id and the version of the command
130 * and vice versa
131*/
132static inline u8 iwl_cmd_opcode(u32 cmdid)
133{
134 return cmdid & 0xFF;
135}
136
137static inline u8 iwl_cmd_groupid(u32 cmdid)
138{
139 return ((cmdid & 0xFF00) >> 8);
140}
141
142static inline u8 iwl_cmd_version(u32 cmdid)
143{
144 return ((cmdid & 0xFF0000) >> 16);
145}
146
147static inline u32 iwl_cmd_id(u8 opcode, u8 groupid, u8 version)
148{
149 return opcode + (groupid << 8) + (version << 16);
150}
151
152/* make u16 wide id out of u8 group and opcode */
153#define WIDE_ID(grp, opcode) ((grp << 8) | opcode)
154
155/* due to the conversion, this group is special; new groups
156 * should be defined in the appropriate fw-api header files
157 */
158#define IWL_ALWAYS_LONG_GROUP 1
159
160/**
161 * struct iwl_cmd_header
162 *
163 * This header format appears in the beginning of each command sent from the
164 * driver, and each response/notification received from uCode.
165 */
166struct iwl_cmd_header {
167 u8 cmd; /* Command ID: REPLY_RXON, etc. */
168 u8 group_id;
169 /*
170 * The driver sets up the sequence number to values of its choosing.
171 * uCode does not use this value, but passes it back to the driver
172 * when sending the response to each driver-originated command, so
173 * the driver can match the response to the command. Since the values
174 * don't get used by uCode, the driver may set up an arbitrary format.
175 *
176 * There is one exception: uCode sets bit 15 when it originates
177 * the response/notification, i.e. when the response/notification
178 * is not a direct response to a command sent by the driver. For
179 * example, uCode issues REPLY_RX when it sends a received frame
180 * to the driver; it is not a direct response to any driver command.
181 *
182 * The Linux driver uses the following format:
183 *
184 * 0:7 tfd index - position within TX queue
185 * 8:12 TX queue id
186 * 13:14 reserved
187 * 15 unsolicited RX or uCode-originated notification
188 */
189 __le16 sequence;
190} __packed;
191
192/**
193 * struct iwl_cmd_header_wide
194 *
195 * This header format appears in the beginning of each command sent from the
196 * driver, and each response/notification received from uCode.
197 * this is the wide version that contains more information about the command
198 * like length, version and command type
199 */
200struct iwl_cmd_header_wide {
201 u8 cmd;
202 u8 group_id;
203 __le16 sequence;
204 __le16 length;
205 u8 reserved;
206 u8 version;
207} __packed;
208
209#define FH_RSCSR_FRAME_SIZE_MSK 0x00003FFF /* bits 0-13 */
210#define FH_RSCSR_FRAME_INVALID 0x55550000
211#define FH_RSCSR_FRAME_ALIGN 0x40
212
213struct iwl_rx_packet {
214 /*
215 * The first 4 bytes of the RX frame header contain both the RX frame
216 * size and some flags.
217 * Bit fields:
218 * 31: flag flush RB request
219 * 30: flag ignore TC (terminal counter) request
220 * 29: flag fast IRQ request
221 * 28-14: Reserved
222 * 13-00: RX frame size
223 */
224 __le32 len_n_flags;
225 struct iwl_cmd_header hdr;
226 u8 data[];
227} __packed;
228
229static inline u32 iwl_rx_packet_len(const struct iwl_rx_packet *pkt)
230{
231 return le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
232}
233
234static inline u32 iwl_rx_packet_payload_len(const struct iwl_rx_packet *pkt)
235{
236 return iwl_rx_packet_len(pkt) - sizeof(pkt->hdr);
237}
238
239/**
240 * enum CMD_MODE - how to send the host commands ?
241 *
242 * @CMD_ASYNC: Return right away and don't wait for the response
243 * @CMD_WANT_SKB: Not valid with CMD_ASYNC. The caller needs the buffer of
244 * the response. The caller needs to call iwl_free_resp when done.
245 * @CMD_HIGH_PRIO: The command is high priority - it goes to the front of the
246 * command queue, but after other high priority commands. Valid only
247 * with CMD_ASYNC.
248 * @CMD_SEND_IN_IDLE: The command should be sent even when the trans is idle.
249 * @CMD_MAKE_TRANS_IDLE: The command response should mark the trans as idle.
250 * @CMD_WAKE_UP_TRANS: The command response should wake up the trans
251 * (i.e. mark it as non-idle).
252 * @CMD_WANT_ASYNC_CALLBACK: the op_mode's async callback function must be
253 * called after this command completes. Valid only with CMD_ASYNC.
254 * @CMD_TB_BITMAP_POS: Position of the first bit for the TB bitmap. We need to
255 * check that we leave enough room for the TBs bitmap which needs 20 bits.
256 */
257enum CMD_MODE {
258 CMD_ASYNC = BIT(0),
259 CMD_WANT_SKB = BIT(1),
260 CMD_SEND_IN_RFKILL = BIT(2),
261 CMD_HIGH_PRIO = BIT(3),
262 CMD_SEND_IN_IDLE = BIT(4),
263 CMD_MAKE_TRANS_IDLE = BIT(5),
264 CMD_WAKE_UP_TRANS = BIT(6),
265 CMD_WANT_ASYNC_CALLBACK = BIT(7),
266
267 CMD_TB_BITMAP_POS = 11,
268};
269
270#define DEF_CMD_PAYLOAD_SIZE 320
271
272/**
273 * struct iwl_device_cmd
274 *
275 * For allocation of the command and tx queues, this establishes the overall
276 * size of the largest command we send to uCode, except for commands that
277 * aren't fully copied and use other TFD space.
278 */
279struct iwl_device_cmd {
280 union {
281 struct {
282 struct iwl_cmd_header hdr; /* uCode API */
283 u8 payload[DEF_CMD_PAYLOAD_SIZE];
284 };
285 struct {
286 struct iwl_cmd_header_wide hdr_wide;
287 u8 payload_wide[DEF_CMD_PAYLOAD_SIZE -
288 sizeof(struct iwl_cmd_header_wide) +
289 sizeof(struct iwl_cmd_header)];
290 };
291 };
292} __packed;
293
294#define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_device_cmd))
295
296/*
297 * number of transfer buffers (fragments) per transmit frame descriptor;
298 * this is just the driver's idea, the hardware supports 20
299 */
300#define IWL_MAX_CMD_TBS_PER_TFD 2
301
302/**
303 * struct iwl_hcmd_dataflag - flag for each one of the chunks of the command
304 *
305 * @IWL_HCMD_DFL_NOCOPY: By default, the command is copied to the host command's
306 * ring. The transport layer doesn't map the command's buffer to DMA, but
307 * rather copies it to a previously allocated DMA buffer. This flag tells
308 * the transport layer not to copy the command, but to map the existing
309 * buffer (that is passed in) instead. This saves the memcpy and allows
310 * commands that are bigger than the fixed buffer to be submitted.
311 * Note that a TFD entry after a NOCOPY one cannot be a normal copied one.
312 * @IWL_HCMD_DFL_DUP: Only valid without NOCOPY, duplicate the memory for this
313 * chunk internally and free it again after the command completes. This
314 * can (currently) be used only once per command.
315 * Note that a TFD entry after a DUP one cannot be a normal copied one.
316 */
317enum iwl_hcmd_dataflag {
318 IWL_HCMD_DFL_NOCOPY = BIT(0),
319 IWL_HCMD_DFL_DUP = BIT(1),
320};
321
322/**
323 * struct iwl_host_cmd - Host command to the uCode
324 *
325 * @data: array of chunks that composes the data of the host command
326 * @resp_pkt: response packet, if %CMD_WANT_SKB was set
327 * @_rx_page_order: (internally used to free response packet)
328 * @_rx_page_addr: (internally used to free response packet)
329 * @flags: can be CMD_*
330 * @len: array of the lengths of the chunks in data
331 * @dataflags: IWL_HCMD_DFL_*
332 * @id: command id of the host command, for wide commands encoding the
333 * version and group as well
334 */
335struct iwl_host_cmd {
336 const void *data[IWL_MAX_CMD_TBS_PER_TFD];
337 struct iwl_rx_packet *resp_pkt;
338 unsigned long _rx_page_addr;
339 u32 _rx_page_order;
340
341 u32 flags;
342 u32 id;
343 u16 len[IWL_MAX_CMD_TBS_PER_TFD];
344 u8 dataflags[IWL_MAX_CMD_TBS_PER_TFD];
345};
346
347static inline void iwl_free_resp(struct iwl_host_cmd *cmd)
348{
349 free_pages(cmd->_rx_page_addr, cmd->_rx_page_order);
350}
351
352struct iwl_rx_cmd_buffer {
353 struct page *_page;
354 int _offset;
355 bool _page_stolen;
356 u32 _rx_page_order;
357 unsigned int truesize;
358};
359
360static inline void *rxb_addr(struct iwl_rx_cmd_buffer *r)
361{
362 return (void *)((unsigned long)page_address(r->_page) + r->_offset);
363}
364
365static inline int rxb_offset(struct iwl_rx_cmd_buffer *r)
366{
367 return r->_offset;
368}
369
370static inline struct page *rxb_steal_page(struct iwl_rx_cmd_buffer *r)
371{
372 r->_page_stolen = true;
373 get_page(r->_page);
374 return r->_page;
375}
376
377static inline void iwl_free_rxb(struct iwl_rx_cmd_buffer *r)
378{
379 __free_pages(r->_page, r->_rx_page_order);
380}
381
382#define MAX_NO_RECLAIM_CMDS 6
383
384/*
385 * The first entry in driver_data array in ieee80211_tx_info
386 * that can be used by the transport.
387 */
388#define IWL_TRANS_FIRST_DRIVER_DATA 2
389#define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))
390
391/*
392 * Maximum number of HW queues the transport layer
393 * currently supports
394 */
395#define IWL_MAX_HW_QUEUES 32
396#define IWL_MAX_TID_COUNT 8
397#define IWL_FRAME_LIMIT 64
398#define IWL_MAX_RX_HW_QUEUES 16
399
400/**
401 * enum iwl_wowlan_status - WoWLAN image/device status
402 * @IWL_D3_STATUS_ALIVE: firmware is still running after resume
403 * @IWL_D3_STATUS_RESET: device was reset while suspended
404 */
405enum iwl_d3_status {
406 IWL_D3_STATUS_ALIVE,
407 IWL_D3_STATUS_RESET,
408};
409
410/**
411 * enum iwl_trans_status: transport status flags
412 * @STATUS_SYNC_HCMD_ACTIVE: a SYNC command is being processed
413 * @STATUS_DEVICE_ENABLED: APM is enabled
414 * @STATUS_TPOWER_PMI: the device might be asleep (need to wake it up)
415 * @STATUS_INT_ENABLED: interrupts are enabled
416 * @STATUS_RFKILL: the HW RFkill switch is in KILL position
417 * @STATUS_FW_ERROR: the fw is in error state
418 * @STATUS_TRANS_GOING_IDLE: shutting down the trans, only special commands
419 * are sent
420 * @STATUS_TRANS_IDLE: the trans is idle - general commands are not to be sent
421 * @STATUS_TRANS_DEAD: trans is dead - avoid any read/write operation
422 */
423enum iwl_trans_status {
424 STATUS_SYNC_HCMD_ACTIVE,
425 STATUS_DEVICE_ENABLED,
426 STATUS_TPOWER_PMI,
427 STATUS_INT_ENABLED,
428 STATUS_RFKILL,
429 STATUS_FW_ERROR,
430 STATUS_TRANS_GOING_IDLE,
431 STATUS_TRANS_IDLE,
432 STATUS_TRANS_DEAD,
433};
434
435static inline int
436iwl_trans_get_rb_size_order(enum iwl_amsdu_size rb_size)
437{
438 switch (rb_size) {
439 case IWL_AMSDU_4K:
440 return get_order(4 * 1024);
441 case IWL_AMSDU_8K:
442 return get_order(8 * 1024);
443 case IWL_AMSDU_12K:
444 return get_order(12 * 1024);
445 default:
446 WARN_ON(1);
447 return -1;
448 }
449}
450
451struct iwl_hcmd_names {
452 u8 cmd_id;
453 const char *const cmd_name;
454};
455
456#define HCMD_NAME(x) \
457 { .cmd_id = x, .cmd_name = #x }
458
459struct iwl_hcmd_arr {
460 const struct iwl_hcmd_names *arr;
461 int size;
462};
463
464#define HCMD_ARR(x) \
465 { .arr = x, .size = ARRAY_SIZE(x) }
466
467/**
468 * struct iwl_trans_config - transport configuration
469 *
470 * @op_mode: pointer to the upper layer.
471 * @cmd_queue: the index of the command queue.
472 * Must be set before start_fw.
473 * @cmd_fifo: the fifo for host commands
474 * @cmd_q_wdg_timeout: the timeout of the watchdog timer for the command queue.
475 * @no_reclaim_cmds: Some devices erroneously don't set the
476 * SEQ_RX_FRAME bit on some notifications, this is the
477 * list of such notifications to filter. Max length is
478 * %MAX_NO_RECLAIM_CMDS.
479 * @n_no_reclaim_cmds: # of commands in list
480 * @rx_buf_size: RX buffer size needed for A-MSDUs
481 * if unset 4k will be the RX buffer size
482 * @bc_table_dword: set to true if the BC table expects the byte count to be
483 * in DWORD (as opposed to bytes)
484 * @scd_set_active: should the transport configure the SCD for HCMD queue
485 * @wide_cmd_header: firmware supports wide host command header
486 * @sw_csum_tx: transport should compute the TCP checksum
487 * @command_groups: array of command groups, each member is an array of the
488 * commands in the group; for debugging only
489 * @command_groups_size: number of command groups, to avoid illegal access
490 * @sdio_adma_addr: the default address to set for the ADMA in SDIO mode until
491 * we get the ALIVE from the uCode
492 */
493struct iwl_trans_config {
494 struct iwl_op_mode *op_mode;
495
496 u8 cmd_queue;
497 u8 cmd_fifo;
498 unsigned int cmd_q_wdg_timeout;
499 const u8 *no_reclaim_cmds;
500 unsigned int n_no_reclaim_cmds;
501
502 enum iwl_amsdu_size rx_buf_size;
503 bool bc_table_dword;
504 bool scd_set_active;
505 bool wide_cmd_header;
506 bool sw_csum_tx;
507 const struct iwl_hcmd_arr *command_groups;
508 int command_groups_size;
509
510 u32 sdio_adma_addr;
511};
512
513struct iwl_trans_dump_data {
514 u32 len;
515 u8 data[];
516};
517
518struct iwl_trans;
519
520struct iwl_trans_txq_scd_cfg {
521 u8 fifo;
522 s8 sta_id;
523 u8 tid;
524 bool aggregate;
525 int frame_limit;
526};
527
528/**
529 * struct iwl_trans_ops - transport specific operations
530 *
531 * All the handlers MUST be implemented
532 *
533 * @start_hw: starts the HW. If low_power is true, the NIC needs to be taken
534 * out of a low power state. From that point on, the HW can send
535 * interrupts. May sleep.
536 * @op_mode_leave: Turn off the HW RF kill indication if on
537 * May sleep
538 * @start_fw: allocates and inits all the resources for the transport
539 * layer. Also kick a fw image.
540 * May sleep
541 * @fw_alive: called when the fw sends alive notification. If the fw provides
542 * the SCD base address in SRAM, then provide it here, or 0 otherwise.
543 * May sleep
544 * @stop_device: stops the whole device (embedded CPU put to reset) and stops
545 * the HW. If low_power is true, the NIC will be put in low power state.
546 * From that point on, the HW will be stopped but will still issue an
547 * interrupt if the HW RF kill switch is triggered.
548 * This callback must do the right thing and not crash even if %start_hw()
549 * was called but not &start_fw(). May sleep.
550 * @d3_suspend: put the device into the correct mode for WoWLAN during
551 * suspend. This is optional, if not implemented WoWLAN will not be
552 * supported. This callback may sleep.
553 * @d3_resume: resume the device after WoWLAN, enabling the opmode to
554 * talk to the WoWLAN image to get its status. This is optional, if not
555 * implemented WoWLAN will not be supported. This callback may sleep.
556 * @send_cmd:send a host command. Must return -ERFKILL if RFkill is asserted.
557 * If RFkill is asserted in the middle of a SYNC host command, it must
558 * return -ERFKILL straight away.
559 * May sleep only if CMD_ASYNC is not set
560 * @tx: send an skb. The transport relies on the op_mode to zero the
561 * the ieee80211_tx_info->driver_data. If the MPDU is an A-MSDU, all
562 * the CSUM will be taken care of (TCP CSUM and IP header in case of
563 * IPv4). If the MPDU is a single MSDU, the op_mode must compute the IP
564 * header if it is IPv4.
565 * Must be atomic
566 * @reclaim: free packet until ssn. Returns a list of freed packets.
567 * Must be atomic
568 * @txq_enable: setup a queue. To setup an AC queue, use the
569 * iwl_trans_ac_txq_enable wrapper. fw_alive must have been called before
570 * this one. The op_mode must not configure the HCMD queue. The scheduler
571 * configuration may be %NULL, in which case the hardware will not be
572 * configured. May sleep.
573 * @txq_disable: de-configure a Tx queue to send AMPDUs
574 * Must be atomic
575 * @wait_tx_queue_empty: wait until tx queues are empty. May sleep.
576 * @freeze_txq_timer: prevents the timer of the queue from firing until the
577 * queue is set to awake. Must be atomic.
578 * @block_txq_ptrs: stop updating the write pointers of the Tx queues. Note
579 * that the transport needs to refcount the calls since this function
580 * will be called several times with block = true, and then the queues
581 * need to be unblocked only after the same number of calls with
582 * block = false.
583 * @write8: write a u8 to a register at offset ofs from the BAR
584 * @write32: write a u32 to a register at offset ofs from the BAR
585 * @read32: read a u32 register at offset ofs from the BAR
586 * @read_prph: read a DWORD from a periphery register
587 * @write_prph: write a DWORD to a periphery register
588 * @read_mem: read device's SRAM in DWORD
589 * @write_mem: write device's SRAM in DWORD. If %buf is %NULL, then the memory
590 * will be zeroed.
591 * @configure: configure parameters required by the transport layer from
592 * the op_mode. May be called several times before start_fw, can't be
593 * called after that.
594 * @set_pmi: set the power pmi state
595 * @grab_nic_access: wake the NIC to be able to access non-HBUS regs.
596 * Sleeping is not allowed between grab_nic_access and
597 * release_nic_access.
598 * @release_nic_access: let the NIC go to sleep. The "flags" parameter
599 * must be the same one that was sent before to the grab_nic_access.
600 * @set_bits_mask - set SRAM register according to value and mask.
601 * @ref: grab a reference to the transport/FW layers, disallowing
602 * certain low power states
603 * @unref: release a reference previously taken with @ref. Note that
604 * initially the reference count is 1, making an initial @unref
605 * necessary to allow low power states.
606 * @dump_data: return a vmalloc'ed buffer with debug data, maybe containing last
607 * TX'ed commands and similar. The buffer will be vfree'd by the caller.
608 * Note that the transport must fill in the proper file headers.
609 */
610struct iwl_trans_ops {
611
612 int (*start_hw)(struct iwl_trans *iwl_trans, bool low_power);
613 void (*op_mode_leave)(struct iwl_trans *iwl_trans);
614 int (*start_fw)(struct iwl_trans *trans, const struct fw_img *fw,
615 bool run_in_rfkill);
616 int (*update_sf)(struct iwl_trans *trans,
617 struct iwl_sf_region *st_fwrd_space);
618 void (*fw_alive)(struct iwl_trans *trans, u32 scd_addr);
619 void (*stop_device)(struct iwl_trans *trans, bool low_power);
620
621 void (*d3_suspend)(struct iwl_trans *trans, bool test, bool reset);
622 int (*d3_resume)(struct iwl_trans *trans, enum iwl_d3_status *status,
623 bool test, bool reset);
624
625 int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
626
627 int (*tx)(struct iwl_trans *trans, struct sk_buff *skb,
628 struct iwl_device_cmd *dev_cmd, int queue);
629 void (*reclaim)(struct iwl_trans *trans, int queue, int ssn,
630 struct sk_buff_head *skbs);
631
632 void (*txq_enable)(struct iwl_trans *trans, int queue, u16 ssn,
633 const struct iwl_trans_txq_scd_cfg *cfg,
634 unsigned int queue_wdg_timeout);
635 void (*txq_disable)(struct iwl_trans *trans, int queue,
636 bool configure_scd);
637
638 int (*wait_tx_queue_empty)(struct iwl_trans *trans, u32 txq_bm);
639 void (*freeze_txq_timer)(struct iwl_trans *trans, unsigned long txqs,
640 bool freeze);
641 void (*block_txq_ptrs)(struct iwl_trans *trans, bool block);
642
643 void (*write8)(struct iwl_trans *trans, u32 ofs, u8 val);
644 void (*write32)(struct iwl_trans *trans, u32 ofs, u32 val);
645 u32 (*read32)(struct iwl_trans *trans, u32 ofs);
646 u32 (*read_prph)(struct iwl_trans *trans, u32 ofs);
647 void (*write_prph)(struct iwl_trans *trans, u32 ofs, u32 val);
648 int (*read_mem)(struct iwl_trans *trans, u32 addr,
649 void *buf, int dwords);
650 int (*write_mem)(struct iwl_trans *trans, u32 addr,
651 const void *buf, int dwords);
652 void (*configure)(struct iwl_trans *trans,
653 const struct iwl_trans_config *trans_cfg);
654 void (*set_pmi)(struct iwl_trans *trans, bool state);
655 bool (*grab_nic_access)(struct iwl_trans *trans, unsigned long *flags);
656 void (*release_nic_access)(struct iwl_trans *trans,
657 unsigned long *flags);
658 void (*set_bits_mask)(struct iwl_trans *trans, u32 reg, u32 mask,
659 u32 value);
660 void (*ref)(struct iwl_trans *trans);
661 void (*unref)(struct iwl_trans *trans);
662 int (*suspend)(struct iwl_trans *trans);
663 void (*resume)(struct iwl_trans *trans);
664
665 struct iwl_trans_dump_data *(*dump_data)(struct iwl_trans *trans,
666 const struct iwl_fw_dbg_trigger_tlv
667 *trigger);
668};
669
670/**
671 * enum iwl_trans_state - state of the transport layer
672 *
673 * @IWL_TRANS_NO_FW: no fw has sent an alive response
674 * @IWL_TRANS_FW_ALIVE: a fw has sent an alive response
675 */
676enum iwl_trans_state {
677 IWL_TRANS_NO_FW = 0,
678 IWL_TRANS_FW_ALIVE = 1,
679};
680
681/**
682 * DOC: Platform power management
683 *
684 * There are two types of platform power management: system-wide
685 * (WoWLAN) and runtime.
686 *
687 * In system-wide power management the entire platform goes into a low
688 * power state (e.g. idle or suspend to RAM) at the same time and the
689 * device is configured as a wakeup source for the entire platform.
690 * This is usually triggered by userspace activity (e.g. the user
691 * presses the suspend button or a power management daemon decides to
692 * put the platform in low power mode). The device's behavior in this
693 * mode is dictated by the wake-on-WLAN configuration.
694 *
695 * In runtime power management, only the devices which are themselves
696 * idle enter a low power state. This is done at runtime, which means
697 * that the entire system is still running normally. This mode is
698 * usually triggered automatically by the device driver and requires
699 * the ability to enter and exit the low power modes in a very short
700 * time, so there is not much impact in usability.
701 *
702 * The terms used for the device's behavior are as follows:
703 *
704 * - D0: the device is fully powered and the host is awake;
705 * - D3: the device is in low power mode and only reacts to
706 * specific events (e.g. magic-packet received or scan
707 * results found);
708 * - D0I3: the device is in low power mode and reacts to any
709 * activity (e.g. RX);
710 *
711 * These terms reflect the power modes in the firmware and are not to
712 * be confused with the physical device power state. The NIC can be
713 * in D0I3 mode even if, for instance, the PCI device is in D3 state.
714 */
715
716/**
717 * enum iwl_plat_pm_mode - platform power management mode
718 *
719 * This enumeration describes the device's platform power management
720 * behavior when in idle mode (i.e. runtime power management) or when
721 * in system-wide suspend (i.e WoWLAN).
722 *
723 * @IWL_PLAT_PM_MODE_DISABLED: power management is disabled for this
724 * device. At runtime, this means that nothing happens and the
725 * device always remains in active. In system-wide suspend mode,
726 * it means that the all connections will be closed automatically
727 * by mac80211 before the platform is suspended.
728 * @IWL_PLAT_PM_MODE_D3: the device goes into D3 mode (i.e. WoWLAN).
729 * For runtime power management, this mode is not officially
730 * supported.
731 * @IWL_PLAT_PM_MODE_D0I3: the device goes into D0I3 mode.
732 */
733enum iwl_plat_pm_mode {
734 IWL_PLAT_PM_MODE_DISABLED,
735 IWL_PLAT_PM_MODE_D3,
736 IWL_PLAT_PM_MODE_D0I3,
737};
738
739/* Max time to wait for trans to become idle/non-idle on d0i3
740 * enter/exit (in msecs).
741 */
742#define IWL_TRANS_IDLE_TIMEOUT 2000
743
744/**
745 * struct iwl_trans - transport common data
746 *
747 * @ops - pointer to iwl_trans_ops
748 * @op_mode - pointer to the op_mode
749 * @cfg - pointer to the configuration
750 * @status: a bit-mask of transport status flags
751 * @dev - pointer to struct device * that represents the device
752 * @max_skb_frags: maximum number of fragments an SKB can have when transmitted.
753 * 0 indicates that frag SKBs (NETIF_F_SG) aren't supported.
754 * @hw_id: a u32 with the ID of the device / sub-device.
755 * Set during transport allocation.
756 * @hw_id_str: a string with info about HW ID. Set during transport allocation.
757 * @pm_support: set to true in start_hw if link pm is supported
758 * @ltr_enabled: set to true if the LTR is enabled
759 * @num_rx_queues: number of RX queues allocated by the transport;
760 * the transport must set this before calling iwl_drv_start()
761 * @dev_cmd_pool: pool for Tx cmd allocation - for internal use only.
762 * The user should use iwl_trans_{alloc,free}_tx_cmd.
763 * @dev_cmd_headroom: room needed for the transport's private use before the
764 * device_cmd for Tx - for internal use only
765 * The user should use iwl_trans_{alloc,free}_tx_cmd.
766 * @rx_mpdu_cmd: MPDU RX command ID, must be assigned by opmode before
767 * starting the firmware, used for tracing
768 * @rx_mpdu_cmd_hdr_size: used for tracing, amount of data before the
769 * start of the 802.11 header in the @rx_mpdu_cmd
770 * @dflt_pwr_limit: default power limit fetched from the platform (ACPI)
771 * @dbg_dest_tlv: points to the destination TLV for debug
772 * @dbg_conf_tlv: array of pointers to configuration TLVs for debug
773 * @dbg_trigger_tlv: array of pointers to triggers TLVs for debug
774 * @dbg_dest_reg_num: num of reg_ops in %dbg_dest_tlv
775 * @paging_req_addr: The location were the FW will upload / download the pages
776 * from. The address is set by the opmode
777 * @paging_db: Pointer to the opmode paging data base, the pointer is set by
778 * the opmode.
779 * @paging_download_buf: Buffer used for copying all of the pages before
780 * downloading them to the FW. The buffer is allocated in the opmode
781 * @system_pm_mode: the system-wide power management mode in use.
782 * This mode is set dynamically, depending on the WoWLAN values
783 * configured from the userspace at runtime.
784 * @runtime_pm_mode: the runtime power management mode in use. This
785 * mode is set during the initialization phase and is not
786 * supposed to change during runtime.
787 */
788struct iwl_trans {
789 const struct iwl_trans_ops *ops;
790 struct iwl_op_mode *op_mode;
791 const struct iwl_cfg *cfg;
792 enum iwl_trans_state state;
793 unsigned long status;
794
795 struct device *dev;
796 u32 max_skb_frags;
797 u32 hw_rev;
798 u32 hw_id;
799 char hw_id_str[52];
800
801 u8 rx_mpdu_cmd, rx_mpdu_cmd_hdr_size;
802
803 bool pm_support;
804 bool ltr_enabled;
805
806 const struct iwl_hcmd_arr *command_groups;
807 int command_groups_size;
808
809 u8 num_rx_queues;
810
811 /* The following fields are internal only */
812 struct kmem_cache *dev_cmd_pool;
813 size_t dev_cmd_headroom;
814 char dev_cmd_pool_name[50];
815
816 struct dentry *dbgfs_dir;
817
818#ifdef CONFIG_LOCKDEP
819 struct lockdep_map sync_cmd_lockdep_map;
820#endif
821
822 u64 dflt_pwr_limit;
823
824 const struct iwl_fw_dbg_dest_tlv *dbg_dest_tlv;
825 const struct iwl_fw_dbg_conf_tlv *dbg_conf_tlv[FW_DBG_CONF_MAX];
826 struct iwl_fw_dbg_trigger_tlv * const *dbg_trigger_tlv;
827 u8 dbg_dest_reg_num;
828
829 /*
830 * Paging parameters - All of the parameters should be set by the
831 * opmode when paging is enabled
832 */
833 u32 paging_req_addr;
834 struct iwl_fw_paging *paging_db;
835 void *paging_download_buf;
836
837 enum iwl_plat_pm_mode system_pm_mode;
838 enum iwl_plat_pm_mode runtime_pm_mode;
839 bool suspending;
840
841 /* pointer to trans specific struct */
842 /*Ensure that this pointer will always be aligned to sizeof pointer */
843 char trans_specific[0] __aligned(sizeof(void *));
844};
845
846const char *iwl_get_cmd_string(struct iwl_trans *trans, u32 id);
847int iwl_cmd_groups_verify_sorted(const struct iwl_trans_config *trans);
848
849static inline void iwl_trans_configure(struct iwl_trans *trans,
850 const struct iwl_trans_config *trans_cfg)
851{
852 trans->op_mode = trans_cfg->op_mode;
853
854 trans->ops->configure(trans, trans_cfg);
855 WARN_ON(iwl_cmd_groups_verify_sorted(trans_cfg));
856}
857
858static inline int _iwl_trans_start_hw(struct iwl_trans *trans, bool low_power)
859{
860 might_sleep();
861
862 return trans->ops->start_hw(trans, low_power);
863}
864
865static inline int iwl_trans_start_hw(struct iwl_trans *trans)
866{
867 return trans->ops->start_hw(trans, true);
868}
869
870static inline void iwl_trans_op_mode_leave(struct iwl_trans *trans)
871{
872 might_sleep();
873
874 if (trans->ops->op_mode_leave)
875 trans->ops->op_mode_leave(trans);
876
877 trans->op_mode = NULL;
878
879 trans->state = IWL_TRANS_NO_FW;
880}
881
882static inline void iwl_trans_fw_alive(struct iwl_trans *trans, u32 scd_addr)
883{
884 might_sleep();
885
886 trans->state = IWL_TRANS_FW_ALIVE;
887
888 trans->ops->fw_alive(trans, scd_addr);
889}
890
891static inline int iwl_trans_start_fw(struct iwl_trans *trans,
892 const struct fw_img *fw,
893 bool run_in_rfkill)
894{
895 might_sleep();
896
897 WARN_ON_ONCE(!trans->rx_mpdu_cmd);
898
899 clear_bit(STATUS_FW_ERROR, &trans->status);
900 return trans->ops->start_fw(trans, fw, run_in_rfkill);
901}
902
903static inline int iwl_trans_update_sf(struct iwl_trans *trans,
904 struct iwl_sf_region *st_fwrd_space)
905{
906 might_sleep();
907
908 if (trans->ops->update_sf)
909 return trans->ops->update_sf(trans, st_fwrd_space);
910
911 return 0;
912}
913
914static inline void _iwl_trans_stop_device(struct iwl_trans *trans,
915 bool low_power)
916{
917 might_sleep();
918
919 trans->ops->stop_device(trans, low_power);
920
921 trans->state = IWL_TRANS_NO_FW;
922}
923
924static inline void iwl_trans_stop_device(struct iwl_trans *trans)
925{
926 _iwl_trans_stop_device(trans, true);
927}
928
929static inline void iwl_trans_d3_suspend(struct iwl_trans *trans, bool test,
930 bool reset)
931{
932 might_sleep();
933 if (trans->ops->d3_suspend)
934 trans->ops->d3_suspend(trans, test, reset);
935}
936
937static inline int iwl_trans_d3_resume(struct iwl_trans *trans,
938 enum iwl_d3_status *status,
939 bool test, bool reset)
940{
941 might_sleep();
942 if (!trans->ops->d3_resume)
943 return 0;
944
945 return trans->ops->d3_resume(trans, status, test, reset);
946}
947
948static inline void iwl_trans_ref(struct iwl_trans *trans)
949{
950 if (trans->ops->ref)
951 trans->ops->ref(trans);
952}
953
954static inline void iwl_trans_unref(struct iwl_trans *trans)
955{
956 if (trans->ops->unref)
957 trans->ops->unref(trans);
958}
959
960static inline int iwl_trans_suspend(struct iwl_trans *trans)
961{
962 if (!trans->ops->suspend)
963 return 0;
964
965 return trans->ops->suspend(trans);
966}
967
968static inline void iwl_trans_resume(struct iwl_trans *trans)
969{
970 if (trans->ops->resume)
971 trans->ops->resume(trans);
972}
973
974static inline struct iwl_trans_dump_data *
975iwl_trans_dump_data(struct iwl_trans *trans,
976 const struct iwl_fw_dbg_trigger_tlv *trigger)
977{
978 if (!trans->ops->dump_data)
979 return NULL;
980 return trans->ops->dump_data(trans, trigger);
981}
982
983static inline struct iwl_device_cmd *
984iwl_trans_alloc_tx_cmd(struct iwl_trans *trans)
985{
986 u8 *dev_cmd_ptr = kmem_cache_alloc(trans->dev_cmd_pool, GFP_ATOMIC);
987
988 if (unlikely(dev_cmd_ptr == NULL))
989 return NULL;
990
991 return (struct iwl_device_cmd *)
992 (dev_cmd_ptr + trans->dev_cmd_headroom);
993}
994
995int iwl_trans_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
996
997static inline void iwl_trans_free_tx_cmd(struct iwl_trans *trans,
998 struct iwl_device_cmd *dev_cmd)
999{
1000 u8 *dev_cmd_ptr = (u8 *)dev_cmd - trans->dev_cmd_headroom;
1001
1002 kmem_cache_free(trans->dev_cmd_pool, dev_cmd_ptr);
1003}
1004
1005static inline int iwl_trans_tx(struct iwl_trans *trans, struct sk_buff *skb,
1006 struct iwl_device_cmd *dev_cmd, int queue)
1007{
1008 if (unlikely(test_bit(STATUS_FW_ERROR, &trans->status)))
1009 return -EIO;
1010
1011 if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
1012 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
1013 return -EIO;
1014 }
1015
1016 return trans->ops->tx(trans, skb, dev_cmd, queue);
1017}
1018
1019static inline void iwl_trans_reclaim(struct iwl_trans *trans, int queue,
1020 int ssn, struct sk_buff_head *skbs)
1021{
1022 if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
1023 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
1024 return;
1025 }
1026
1027 trans->ops->reclaim(trans, queue, ssn, skbs);
1028}
1029
1030static inline void iwl_trans_txq_disable(struct iwl_trans *trans, int queue,
1031 bool configure_scd)
1032{
1033 trans->ops->txq_disable(trans, queue, configure_scd);
1034}
1035
1036static inline void
1037iwl_trans_txq_enable_cfg(struct iwl_trans *trans, int queue, u16 ssn,
1038 const struct iwl_trans_txq_scd_cfg *cfg,
1039 unsigned int queue_wdg_timeout)
1040{
1041 might_sleep();
1042
1043 if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
1044 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
1045 return;
1046 }
1047
1048 trans->ops->txq_enable(trans, queue, ssn, cfg, queue_wdg_timeout);
1049}
1050
1051static inline void iwl_trans_txq_enable(struct iwl_trans *trans, int queue,
1052 int fifo, int sta_id, int tid,
1053 int frame_limit, u16 ssn,
1054 unsigned int queue_wdg_timeout)
1055{
1056 struct iwl_trans_txq_scd_cfg cfg = {
1057 .fifo = fifo,
1058 .sta_id = sta_id,
1059 .tid = tid,
1060 .frame_limit = frame_limit,
1061 .aggregate = sta_id >= 0,
1062 };
1063
1064 iwl_trans_txq_enable_cfg(trans, queue, ssn, &cfg, queue_wdg_timeout);
1065}
1066
1067static inline
1068void iwl_trans_ac_txq_enable(struct iwl_trans *trans, int queue, int fifo,
1069 unsigned int queue_wdg_timeout)
1070{
1071 struct iwl_trans_txq_scd_cfg cfg = {
1072 .fifo = fifo,
1073 .sta_id = -1,
1074 .tid = IWL_MAX_TID_COUNT,
1075 .frame_limit = IWL_FRAME_LIMIT,
1076 .aggregate = false,
1077 };
1078
1079 iwl_trans_txq_enable_cfg(trans, queue, 0, &cfg, queue_wdg_timeout);
1080}
1081
1082static inline void iwl_trans_freeze_txq_timer(struct iwl_trans *trans,
1083 unsigned long txqs,
1084 bool freeze)
1085{
1086 if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
1087 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
1088 return;
1089 }
1090
1091 if (trans->ops->freeze_txq_timer)
1092 trans->ops->freeze_txq_timer(trans, txqs, freeze);
1093}
1094
1095static inline void iwl_trans_block_txq_ptrs(struct iwl_trans *trans,
1096 bool block)
1097{
1098 if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
1099 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
1100 return;
1101 }
1102
1103 if (trans->ops->block_txq_ptrs)
1104 trans->ops->block_txq_ptrs(trans, block);
1105}
1106
1107static inline int iwl_trans_wait_tx_queue_empty(struct iwl_trans *trans,
1108 u32 txqs)
1109{
1110 if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
1111 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
1112 return -EIO;
1113 }
1114
1115 return trans->ops->wait_tx_queue_empty(trans, txqs);
1116}
1117
1118static inline void iwl_trans_write8(struct iwl_trans *trans, u32 ofs, u8 val)
1119{
1120 trans->ops->write8(trans, ofs, val);
1121}
1122
1123static inline void iwl_trans_write32(struct iwl_trans *trans, u32 ofs, u32 val)
1124{
1125 trans->ops->write32(trans, ofs, val);
1126}
1127
1128static inline u32 iwl_trans_read32(struct iwl_trans *trans, u32 ofs)
1129{
1130 return trans->ops->read32(trans, ofs);
1131}
1132
1133static inline u32 iwl_trans_read_prph(struct iwl_trans *trans, u32 ofs)
1134{
1135 return trans->ops->read_prph(trans, ofs);
1136}
1137
1138static inline void iwl_trans_write_prph(struct iwl_trans *trans, u32 ofs,
1139 u32 val)
1140{
1141 return trans->ops->write_prph(trans, ofs, val);
1142}
1143
1144static inline int iwl_trans_read_mem(struct iwl_trans *trans, u32 addr,
1145 void *buf, int dwords)
1146{
1147 return trans->ops->read_mem(trans, addr, buf, dwords);
1148}
1149
1150#define iwl_trans_read_mem_bytes(trans, addr, buf, bufsize) \
1151 do { \
1152 if (__builtin_constant_p(bufsize)) \
1153 BUILD_BUG_ON((bufsize) % sizeof(u32)); \
1154 iwl_trans_read_mem(trans, addr, buf, (bufsize) / sizeof(u32));\
1155 } while (0)
1156
1157static inline u32 iwl_trans_read_mem32(struct iwl_trans *trans, u32 addr)
1158{
1159 u32 value;
1160
1161 if (WARN_ON(iwl_trans_read_mem(trans, addr, &value, 1)))
1162 return 0xa5a5a5a5;
1163
1164 return value;
1165}
1166
1167static inline int iwl_trans_write_mem(struct iwl_trans *trans, u32 addr,
1168 const void *buf, int dwords)
1169{
1170 return trans->ops->write_mem(trans, addr, buf, dwords);
1171}
1172
1173static inline u32 iwl_trans_write_mem32(struct iwl_trans *trans, u32 addr,
1174 u32 val)
1175{
1176 return iwl_trans_write_mem(trans, addr, &val, 1);
1177}
1178
1179static inline void iwl_trans_set_pmi(struct iwl_trans *trans, bool state)
1180{
1181 if (trans->ops->set_pmi)
1182 trans->ops->set_pmi(trans, state);
1183}
1184
1185static inline void
1186iwl_trans_set_bits_mask(struct iwl_trans *trans, u32 reg, u32 mask, u32 value)
1187{
1188 trans->ops->set_bits_mask(trans, reg, mask, value);
1189}
1190
1191#define iwl_trans_grab_nic_access(trans, flags) \
1192 __cond_lock(nic_access, \
1193 likely((trans)->ops->grab_nic_access(trans, flags)))
1194
1195static inline void __releases(nic_access)
1196iwl_trans_release_nic_access(struct iwl_trans *trans, unsigned long *flags)
1197{
1198 trans->ops->release_nic_access(trans, flags);
1199 __release(nic_access);
1200}
1201
1202static inline void iwl_trans_fw_error(struct iwl_trans *trans)
1203{
1204 if (WARN_ON_ONCE(!trans->op_mode))
1205 return;
1206
1207 /* prevent double restarts due to the same erroneous FW */
1208 if (!test_and_set_bit(STATUS_FW_ERROR, &trans->status))
1209 iwl_op_mode_nic_error(trans->op_mode);
1210}
1211
1212/*****************************************************
1213 * transport helper functions
1214 *****************************************************/
1215struct iwl_trans *iwl_trans_alloc(unsigned int priv_size,
1216 struct device *dev,
1217 const struct iwl_cfg *cfg,
1218 const struct iwl_trans_ops *ops,
1219 size_t dev_cmd_headroom);
1220void iwl_trans_free(struct iwl_trans *trans);
1221
1222/*****************************************************
1223* driver (transport) register/unregister functions
1224******************************************************/
1225int __must_check iwl_pci_register_driver(void);
1226void iwl_pci_unregister_driver(void);
1227
1228#endif /* __iwl_trans_h__ */