1 /******************************************************************************
3 * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
5 * Portions of this file are derived from the ipw3945 project, as well
6 * as portions of the ieee80211 subsystem header files.
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of version 2 of the GNU General Public License as
10 * published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
21 * The full GNU General Public License is included in this distribution in the
22 * file called LICENSE.
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
28 *****************************************************************************/
29 #include <linux/sched.h>
30 #include <linux/wait.h>
31 #include <linux/gfp.h>
33 /*TODO: Remove include to iwl-core.h*/
36 #include "iwl-trans-pcie-int.h"
38 #include "iwl-op-mode.h"
40 #ifdef CONFIG_IWLWIFI_IDI
44 /******************************************************************************
48 ******************************************************************************/
51 * Rx theory of operation
53 * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
54 * each of which point to Receive Buffers to be filled by the NIC. These get
55 * used not only for Rx frames, but for any command response or notification
56 * from the NIC. The driver and NIC manage the Rx buffers by means
57 * of indexes into the circular buffer.
60 * The host/firmware share two index registers for managing the Rx buffers.
62 * The READ index maps to the first position that the firmware may be writing
63 * to -- the driver can read up to (but not including) this position and get
65 * The READ index is managed by the firmware once the card is enabled.
67 * The WRITE index maps to the last position the driver has read from -- the
68 * position preceding WRITE is the last slot the firmware can place a packet.
70 * The queue is empty (no good data) if WRITE = READ - 1, and is full if
73 * During initialization, the host sets up the READ queue position to the first
74 * INDEX position, and WRITE to the last (READ - 1 wrapped)
76 * When the firmware places a packet in a buffer, it will advance the READ index
77 * and fire the RX interrupt. The driver can then query the READ index and
78 * process as many packets as possible, moving the WRITE index forward as it
79 * resets the Rx queue buffers with new memory.
81 * The management in the driver is as follows:
82 * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free. When
83 * iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
84 * to replenish the iwl->rxq->rx_free.
85 * + In iwl_rx_replenish (scheduled) if 'processed' != 'read' then the
86 * iwl->rxq is replenished and the READ INDEX is updated (updating the
87 * 'processed' and 'read' driver indexes as well)
88 * + A received packet is processed and handed to the kernel network stack,
89 * detached from the iwl->rxq. The driver 'processed' index is updated.
90 * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
91 * list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
92 * INDEX is not incremented and iwl->status(RX_STALLED) is set. If there
93 * were enough free buffers and RX_STALLED is set it is cleared.
98 * iwl_rx_queue_alloc() Allocates rx_free
99 * iwl_rx_replenish() Replenishes rx_free list from rx_used, and calls
100 * iwl_rx_queue_restock
101 * iwl_rx_queue_restock() Moves available buffers from rx_free into Rx
102 * queue, updates firmware pointers, and updates
103 * the WRITE index. If insufficient rx_free buffers
104 * are available, schedules iwl_rx_replenish
106 * -- enable interrupts --
107 * ISR - iwl_rx() Detach iwl_rx_mem_buffers from pool up to the
108 * READ INDEX, detaching the SKB from the pool.
109 * Moves the packet buffer from queue to rx_used.
110 * Calls iwl_rx_queue_restock to refill any empty
117 * iwl_rx_queue_space - Return number of free slots available in queue.
119 static int iwl_rx_queue_space(const struct iwl_rx_queue
*q
)
121 int s
= q
->read
- q
->write
;
124 /* keep some buffer to not confuse full and empty queue */
132 * iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue
134 void iwl_rx_queue_update_write_ptr(struct iwl_trans
*trans
,
135 struct iwl_rx_queue
*q
)
140 spin_lock_irqsave(&q
->lock
, flags
);
142 if (q
->need_update
== 0)
145 if (hw_params(trans
).shadow_reg_enable
) {
146 /* shadow register enabled */
147 /* Device expects a multiple of 8 */
148 q
->write_actual
= (q
->write
& ~0x7);
149 iwl_write32(trans
, FH_RSCSR_CHNL0_WPTR
, q
->write_actual
);
151 /* If power-saving is in use, make sure device is awake */
152 if (test_bit(STATUS_POWER_PMI
, &trans
->shrd
->status
)) {
153 reg
= iwl_read32(trans
, CSR_UCODE_DRV_GP1
);
155 if (reg
& CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP
) {
156 IWL_DEBUG_INFO(trans
,
157 "Rx queue requesting wakeup,"
158 " GP1 = 0x%x\n", reg
);
159 iwl_set_bit(trans
, CSR_GP_CNTRL
,
160 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ
);
164 q
->write_actual
= (q
->write
& ~0x7);
165 iwl_write_direct32(trans
, FH_RSCSR_CHNL0_WPTR
,
168 /* Else device is assumed to be awake */
170 /* Device expects a multiple of 8 */
171 q
->write_actual
= (q
->write
& ~0x7);
172 iwl_write_direct32(trans
, FH_RSCSR_CHNL0_WPTR
,
179 spin_unlock_irqrestore(&q
->lock
, flags
);
183 * iwlagn_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
185 static inline __le32
iwlagn_dma_addr2rbd_ptr(dma_addr_t dma_addr
)
187 return cpu_to_le32((u32
)(dma_addr
>> 8));
191 * iwlagn_rx_queue_restock - refill RX queue from pre-allocated pool
193 * If there are slots in the RX queue that need to be restocked,
194 * and we have free pre-allocated buffers, fill the ranks as much
195 * as we can, pulling from rx_free.
197 * This moves the 'write' index forward to catch up with 'processed', and
198 * also updates the memory address in the firmware to reference the new
201 static void iwlagn_rx_queue_restock(struct iwl_trans
*trans
)
203 struct iwl_trans_pcie
*trans_pcie
=
204 IWL_TRANS_GET_PCIE_TRANS(trans
);
206 struct iwl_rx_queue
*rxq
= &trans_pcie
->rxq
;
207 struct list_head
*element
;
208 struct iwl_rx_mem_buffer
*rxb
;
211 spin_lock_irqsave(&rxq
->lock
, flags
);
212 while ((iwl_rx_queue_space(rxq
) > 0) && (rxq
->free_count
)) {
213 /* The overwritten rxb must be a used one */
214 rxb
= rxq
->queue
[rxq
->write
];
215 BUG_ON(rxb
&& rxb
->page
);
217 /* Get next free Rx buffer, remove from free list */
218 element
= rxq
->rx_free
.next
;
219 rxb
= list_entry(element
, struct iwl_rx_mem_buffer
, list
);
222 /* Point to Rx buffer via next RBD in circular buffer */
223 rxq
->bd
[rxq
->write
] = iwlagn_dma_addr2rbd_ptr(rxb
->page_dma
);
224 rxq
->queue
[rxq
->write
] = rxb
;
225 rxq
->write
= (rxq
->write
+ 1) & RX_QUEUE_MASK
;
228 spin_unlock_irqrestore(&rxq
->lock
, flags
);
229 /* If the pre-allocated buffer pool is dropping low, schedule to
231 if (rxq
->free_count
<= RX_LOW_WATERMARK
)
232 schedule_work(&trans_pcie
->rx_replenish
);
235 /* If we've added more space for the firmware to place data, tell it.
236 * Increment device's write pointer in multiples of 8. */
237 if (rxq
->write_actual
!= (rxq
->write
& ~0x7)) {
238 spin_lock_irqsave(&rxq
->lock
, flags
);
239 rxq
->need_update
= 1;
240 spin_unlock_irqrestore(&rxq
->lock
, flags
);
241 iwl_rx_queue_update_write_ptr(trans
, rxq
);
246 * iwlagn_rx_replenish - Move all used packet from rx_used to rx_free
248 * When moving to rx_free an SKB is allocated for the slot.
250 * Also restock the Rx queue via iwl_rx_queue_restock.
251 * This is called as a scheduled work item (except for during initialization)
253 static void iwlagn_rx_allocate(struct iwl_trans
*trans
, gfp_t priority
)
255 struct iwl_trans_pcie
*trans_pcie
=
256 IWL_TRANS_GET_PCIE_TRANS(trans
);
258 struct iwl_rx_queue
*rxq
= &trans_pcie
->rxq
;
259 struct list_head
*element
;
260 struct iwl_rx_mem_buffer
*rxb
;
263 gfp_t gfp_mask
= priority
;
266 spin_lock_irqsave(&rxq
->lock
, flags
);
267 if (list_empty(&rxq
->rx_used
)) {
268 spin_unlock_irqrestore(&rxq
->lock
, flags
);
271 spin_unlock_irqrestore(&rxq
->lock
, flags
);
273 if (rxq
->free_count
> RX_LOW_WATERMARK
)
274 gfp_mask
|= __GFP_NOWARN
;
276 if (hw_params(trans
).rx_page_order
> 0)
277 gfp_mask
|= __GFP_COMP
;
279 /* Alloc a new receive buffer */
280 page
= alloc_pages(gfp_mask
,
281 hw_params(trans
).rx_page_order
);
284 IWL_DEBUG_INFO(trans
, "alloc_pages failed, "
286 hw_params(trans
).rx_page_order
);
288 if ((rxq
->free_count
<= RX_LOW_WATERMARK
) &&
290 IWL_CRIT(trans
, "Failed to alloc_pages with %s."
291 "Only %u free buffers remaining.\n",
292 priority
== GFP_ATOMIC
?
293 "GFP_ATOMIC" : "GFP_KERNEL",
295 /* We don't reschedule replenish work here -- we will
296 * call the restock method and if it still needs
297 * more buffers it will schedule replenish */
301 spin_lock_irqsave(&rxq
->lock
, flags
);
303 if (list_empty(&rxq
->rx_used
)) {
304 spin_unlock_irqrestore(&rxq
->lock
, flags
);
305 __free_pages(page
, hw_params(trans
).rx_page_order
);
308 element
= rxq
->rx_used
.next
;
309 rxb
= list_entry(element
, struct iwl_rx_mem_buffer
, list
);
312 spin_unlock_irqrestore(&rxq
->lock
, flags
);
316 /* Get physical address of the RB */
317 rxb
->page_dma
= dma_map_page(trans
->dev
, page
, 0,
318 PAGE_SIZE
<< hw_params(trans
).rx_page_order
,
320 /* dma address must be no more than 36 bits */
321 BUG_ON(rxb
->page_dma
& ~DMA_BIT_MASK(36));
322 /* and also 256 byte aligned! */
323 BUG_ON(rxb
->page_dma
& DMA_BIT_MASK(8));
325 spin_lock_irqsave(&rxq
->lock
, flags
);
327 list_add_tail(&rxb
->list
, &rxq
->rx_free
);
330 spin_unlock_irqrestore(&rxq
->lock
, flags
);
334 void iwlagn_rx_replenish(struct iwl_trans
*trans
)
336 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
339 iwlagn_rx_allocate(trans
, GFP_KERNEL
);
341 spin_lock_irqsave(&trans_pcie
->irq_lock
, flags
);
342 iwlagn_rx_queue_restock(trans
);
343 spin_unlock_irqrestore(&trans_pcie
->irq_lock
, flags
);
346 static void iwlagn_rx_replenish_now(struct iwl_trans
*trans
)
348 iwlagn_rx_allocate(trans
, GFP_ATOMIC
);
350 iwlagn_rx_queue_restock(trans
);
353 void iwl_bg_rx_replenish(struct work_struct
*data
)
355 struct iwl_trans_pcie
*trans_pcie
=
356 container_of(data
, struct iwl_trans_pcie
, rx_replenish
);
358 iwlagn_rx_replenish(trans_pcie
->trans
);
362 * iwl_rx_handle - Main entry function for receiving responses from uCode
364 * Uses the priv->rx_handlers callback function array to invoke
365 * the appropriate handlers, including command responses,
366 * frame-received notifications, and other notifications.
368 static void iwl_rx_handle(struct iwl_trans
*trans
)
370 struct iwl_rx_mem_buffer
*rxb
;
371 struct iwl_rx_packet
*pkt
;
372 struct iwl_trans_pcie
*trans_pcie
=
373 IWL_TRANS_GET_PCIE_TRANS(trans
);
374 struct iwl_rx_queue
*rxq
= &trans_pcie
->rxq
;
375 struct iwl_tx_queue
*txq
= &trans_pcie
->txq
[trans
->shrd
->cmd_queue
];
376 struct iwl_device_cmd
*cmd
;
383 int index
, cmd_index
;
385 /* uCode's read index (stored in shared DRAM) indicates the last Rx
386 * buffer that the driver may process (last buffer filled by ucode). */
387 r
= le16_to_cpu(rxq
->rb_stts
->closed_rb_num
) & 0x0FFF;
390 /* Rx interrupt, but nothing sent from uCode */
392 IWL_DEBUG_RX(trans
, "r = %d, i = %d\n", r
, i
);
394 /* calculate total frames need to be restock after handling RX */
395 total_empty
= r
- rxq
->write_actual
;
397 total_empty
+= RX_QUEUE_SIZE
;
399 if (total_empty
> (RX_QUEUE_SIZE
/ 2))
408 /* If an RXB doesn't have a Rx queue slot associated with it,
409 * then a bug has been introduced in the queue refilling
410 * routines -- catch it here */
411 if (WARN_ON(rxb
== NULL
)) {
412 i
= (i
+ 1) & RX_QUEUE_MASK
;
416 rxq
->queue
[i
] = NULL
;
418 dma_unmap_page(trans
->dev
, rxb
->page_dma
,
419 PAGE_SIZE
<< hw_params(trans
).rx_page_order
,
423 IWL_DEBUG_RX(trans
, "r = %d, i = %d, %s, 0x%02x\n", r
,
424 i
, get_cmd_string(pkt
->hdr
.cmd
), pkt
->hdr
.cmd
);
426 len
= le32_to_cpu(pkt
->len_n_flags
) & FH_RSCSR_FRAME_SIZE_MSK
;
427 len
+= sizeof(u32
); /* account for status word */
428 trace_iwlwifi_dev_rx(priv(trans
), pkt
, len
);
430 /* Reclaim a command buffer only if this packet is a response
431 * to a (driver-originated) command.
432 * If the packet (e.g. Rx frame) originated from uCode,
433 * there is no command buffer to reclaim.
434 * Ucode should set SEQ_RX_FRAME bit if ucode-originated,
435 * but apparently a few don't get set; catch them here. */
436 reclaim
= !(pkt
->hdr
.sequence
& SEQ_RX_FRAME
) &&
437 (pkt
->hdr
.cmd
!= REPLY_RX_PHY_CMD
) &&
438 (pkt
->hdr
.cmd
!= REPLY_RX
) &&
439 (pkt
->hdr
.cmd
!= REPLY_RX_MPDU_CMD
) &&
440 (pkt
->hdr
.cmd
!= REPLY_COMPRESSED_BA
) &&
441 (pkt
->hdr
.cmd
!= STATISTICS_NOTIFICATION
) &&
442 (pkt
->hdr
.cmd
!= REPLY_TX
);
444 sequence
= le16_to_cpu(pkt
->hdr
.sequence
);
445 index
= SEQ_TO_INDEX(sequence
);
446 cmd_index
= get_cmd_index(&txq
->q
, index
);
449 cmd
= txq
->cmd
[cmd_index
];
453 /* warn if this is cmd response / notification and the uCode
454 * didn't set the SEQ_RX_FRAME for a frame that is
456 * If you saw this code after the second half of 2012, then
459 WARN(pkt
->hdr
.cmd
!= REPLY_TX
&& reclaim
== false &&
460 (!(pkt
->hdr
.sequence
& SEQ_RX_FRAME
)),
461 "reclaim is false, SEQ_RX_FRAME unset: %s\n",
462 get_cmd_string(pkt
->hdr
.cmd
));
464 err
= iwl_op_mode_rx(trans
->op_mode
, rxb
, cmd
);
467 * XXX: After here, we should always check rxb->page
468 * against NULL before touching it or its virtual
469 * memory (pkt). Because some rx_handler might have
470 * already taken or freed the pages.
474 /* Invoke any callbacks, transfer the buffer to caller,
475 * and fire off the (possibly) blocking
476 * iwl_trans_send_cmd()
477 * as we reclaim the driver command queue */
479 iwl_tx_cmd_complete(trans
, rxb
, err
);
481 IWL_WARN(trans
, "Claim null rxb?\n");
484 /* Reuse the page if possible. For notification packets and
485 * SKBs that fail to Rx correctly, add them back into the
486 * rx_free list for reuse later. */
487 spin_lock_irqsave(&rxq
->lock
, flags
);
488 if (rxb
->page
!= NULL
) {
489 rxb
->page_dma
= dma_map_page(trans
->dev
, rxb
->page
,
491 hw_params(trans
).rx_page_order
,
493 list_add_tail(&rxb
->list
, &rxq
->rx_free
);
496 list_add_tail(&rxb
->list
, &rxq
->rx_used
);
498 spin_unlock_irqrestore(&rxq
->lock
, flags
);
500 i
= (i
+ 1) & RX_QUEUE_MASK
;
501 /* If there are a lot of unused frames,
502 * restock the Rx queue so ucode wont assert. */
507 iwlagn_rx_replenish_now(trans
);
513 /* Backtrack one entry */
516 iwlagn_rx_replenish_now(trans
);
518 iwlagn_rx_queue_restock(trans
);
521 static const char * const desc_lookup_text
[] = {
530 "HW_ERROR_TUNE_LOCK",
531 "HW_ERROR_TEMPERATURE",
535 "NMI_INTERRUPT_HOST",
536 "NMI_INTERRUPT_ACTION_PT",
537 "NMI_INTERRUPT_UNKNOWN",
538 "UCODE_VERSION_MISMATCH",
540 "HW_ERROR_CAL_LOCK_FAIL",
541 "NMI_INTERRUPT_INST_ACTION_PT",
542 "NMI_INTERRUPT_DATA_ACTION_PT",
545 "NMI_INTERRUPT_BREAK_POINT",
552 static struct { char *name
; u8 num
; } advanced_lookup
[] = {
553 { "NMI_INTERRUPT_WDG", 0x34 },
554 { "SYSASSERT", 0x35 },
555 { "UCODE_VERSION_MISMATCH", 0x37 },
556 { "BAD_COMMAND", 0x38 },
557 { "NMI_INTERRUPT_DATA_ACTION_PT", 0x3C },
558 { "FATAL_ERROR", 0x3D },
559 { "NMI_TRM_HW_ERR", 0x46 },
560 { "NMI_INTERRUPT_TRM", 0x4C },
561 { "NMI_INTERRUPT_BREAK_POINT", 0x54 },
562 { "NMI_INTERRUPT_WDG_RXF_FULL", 0x5C },
563 { "NMI_INTERRUPT_WDG_NO_RBD_RXF_FULL", 0x64 },
564 { "NMI_INTERRUPT_HOST", 0x66 },
565 { "NMI_INTERRUPT_ACTION_PT", 0x7C },
566 { "NMI_INTERRUPT_UNKNOWN", 0x84 },
567 { "NMI_INTERRUPT_INST_ACTION_PT", 0x86 },
568 { "ADVANCED_SYSASSERT", 0 },
571 static const char *desc_lookup(u32 num
)
574 int max
= ARRAY_SIZE(desc_lookup_text
);
577 return desc_lookup_text
[num
];
579 max
= ARRAY_SIZE(advanced_lookup
) - 1;
580 for (i
= 0; i
< max
; i
++) {
581 if (advanced_lookup
[i
].num
== num
)
584 return advanced_lookup
[i
].name
;
587 #define ERROR_START_OFFSET (1 * sizeof(u32))
588 #define ERROR_ELEM_SIZE (7 * sizeof(u32))
590 static void iwl_dump_nic_error_log(struct iwl_trans
*trans
)
593 struct iwl_error_event_table table
;
594 struct iwl_nic
*nic
= nic(trans
);
595 struct iwl_trans_pcie
*trans_pcie
=
596 IWL_TRANS_GET_PCIE_TRANS(trans
);
598 base
= trans
->shrd
->device_pointers
.error_event_table
;
599 if (trans
->shrd
->ucode_type
== IWL_UCODE_INIT
) {
601 base
= nic
->init_errlog_ptr
;
604 base
= nic
->inst_errlog_ptr
;
607 if (!iwlagn_hw_valid_rtc_data_addr(base
)) {
609 "Not valid error log pointer 0x%08X for %s uCode\n",
611 (trans
->shrd
->ucode_type
== IWL_UCODE_INIT
)
616 iwl_read_targ_mem_words(trans
, base
, &table
, sizeof(table
));
618 if (ERROR_START_OFFSET
<= table
.valid
* ERROR_ELEM_SIZE
) {
619 IWL_ERR(trans
, "Start IWL Error Log Dump:\n");
620 IWL_ERR(trans
, "Status: 0x%08lX, count: %d\n",
621 trans
->shrd
->status
, table
.valid
);
624 trans_pcie
->isr_stats
.err_code
= table
.error_id
;
626 trace_iwlwifi_dev_ucode_error(priv(nic
), table
.error_id
, table
.tsf_low
,
627 table
.data1
, table
.data2
, table
.line
,
628 table
.blink1
, table
.blink2
, table
.ilink1
,
629 table
.ilink2
, table
.bcon_time
, table
.gp1
,
630 table
.gp2
, table
.gp3
, table
.ucode_ver
,
631 table
.hw_ver
, table
.brd_ver
);
632 IWL_ERR(trans
, "0x%08X | %-28s\n", table
.error_id
,
633 desc_lookup(table
.error_id
));
634 IWL_ERR(trans
, "0x%08X | uPc\n", table
.pc
);
635 IWL_ERR(trans
, "0x%08X | branchlink1\n", table
.blink1
);
636 IWL_ERR(trans
, "0x%08X | branchlink2\n", table
.blink2
);
637 IWL_ERR(trans
, "0x%08X | interruptlink1\n", table
.ilink1
);
638 IWL_ERR(trans
, "0x%08X | interruptlink2\n", table
.ilink2
);
639 IWL_ERR(trans
, "0x%08X | data1\n", table
.data1
);
640 IWL_ERR(trans
, "0x%08X | data2\n", table
.data2
);
641 IWL_ERR(trans
, "0x%08X | line\n", table
.line
);
642 IWL_ERR(trans
, "0x%08X | beacon time\n", table
.bcon_time
);
643 IWL_ERR(trans
, "0x%08X | tsf low\n", table
.tsf_low
);
644 IWL_ERR(trans
, "0x%08X | tsf hi\n", table
.tsf_hi
);
645 IWL_ERR(trans
, "0x%08X | time gp1\n", table
.gp1
);
646 IWL_ERR(trans
, "0x%08X | time gp2\n", table
.gp2
);
647 IWL_ERR(trans
, "0x%08X | time gp3\n", table
.gp3
);
648 IWL_ERR(trans
, "0x%08X | uCode version\n", table
.ucode_ver
);
649 IWL_ERR(trans
, "0x%08X | hw version\n", table
.hw_ver
);
650 IWL_ERR(trans
, "0x%08X | board version\n", table
.brd_ver
);
651 IWL_ERR(trans
, "0x%08X | hcmd\n", table
.hcmd
);
653 IWL_ERR(trans
, "0x%08X | isr0\n", table
.isr0
);
654 IWL_ERR(trans
, "0x%08X | isr1\n", table
.isr1
);
655 IWL_ERR(trans
, "0x%08X | isr2\n", table
.isr2
);
656 IWL_ERR(trans
, "0x%08X | isr3\n", table
.isr3
);
657 IWL_ERR(trans
, "0x%08X | isr4\n", table
.isr4
);
658 IWL_ERR(trans
, "0x%08X | isr_pref\n", table
.isr_pref
);
659 IWL_ERR(trans
, "0x%08X | wait_event\n", table
.wait_event
);
660 IWL_ERR(trans
, "0x%08X | l2p_control\n", table
.l2p_control
);
661 IWL_ERR(trans
, "0x%08X | l2p_duration\n", table
.l2p_duration
);
662 IWL_ERR(trans
, "0x%08X | l2p_mhvalid\n", table
.l2p_mhvalid
);
663 IWL_ERR(trans
, "0x%08X | l2p_addr_match\n", table
.l2p_addr_match
);
664 IWL_ERR(trans
, "0x%08X | lmpm_pmg_sel\n", table
.lmpm_pmg_sel
);
665 IWL_ERR(trans
, "0x%08X | timestamp\n", table
.u_timestamp
);
666 IWL_ERR(trans
, "0x%08X | flow_handler\n", table
.flow_handler
);
670 * iwl_irq_handle_error - called for HW or SW error interrupt from card
672 static void iwl_irq_handle_error(struct iwl_trans
*trans
)
674 /* W/A for WiFi/WiMAX coex and WiMAX own the RF */
675 if (cfg(trans
)->internal_wimax_coex
&&
676 (!(iwl_read_prph(trans
, APMG_CLK_CTRL_REG
) &
677 APMS_CLK_VAL_MRB_FUNC_MODE
) ||
678 (iwl_read_prph(trans
, APMG_PS_CTRL_REG
) &
679 APMG_PS_CTRL_VAL_RESET_REQ
))) {
681 * Keep the restart process from trying to send host
682 * commands by clearing the ready bit.
684 clear_bit(STATUS_READY
, &trans
->shrd
->status
);
685 clear_bit(STATUS_HCMD_ACTIVE
, &trans
->shrd
->status
);
686 wake_up(&trans
->shrd
->wait_command_queue
);
687 IWL_ERR(trans
, "RF is used by WiMAX\n");
691 IWL_ERR(trans
, "Loaded firmware version: %s\n",
692 nic(trans
)->fw
.fw_version
);
694 iwl_dump_nic_error_log(trans
);
696 iwl_dump_fh(trans
, NULL
, false);
697 iwl_dump_nic_event_log(trans
, false, NULL
, false);
698 #ifdef CONFIG_IWLWIFI_DEBUG
699 if (iwl_get_debug_level(trans
->shrd
) & IWL_DL_FW_ERRORS
)
700 iwl_print_rx_config_cmd(priv(trans
), IWL_RXON_CTX_BSS
);
703 iwl_op_mode_nic_error(trans
->op_mode
);
706 #define EVENT_START_OFFSET (4 * sizeof(u32))
709 * iwl_print_event_log - Dump error event log to syslog
712 static int iwl_print_event_log(struct iwl_trans
*trans
, u32 start_idx
,
713 u32 num_events
, u32 mode
,
714 int pos
, char **buf
, size_t bufsz
)
717 u32 base
; /* SRAM byte address of event log header */
718 u32 event_size
; /* 2 u32s, or 3 u32s if timestamp recorded */
719 u32 ptr
; /* SRAM byte address of log data */
720 u32 ev
, time
, data
; /* event log data */
721 unsigned long reg_flags
;
722 struct iwl_nic
*nic
= nic(trans
);
727 base
= trans
->shrd
->device_pointers
.log_event_table
;
728 if (trans
->shrd
->ucode_type
== IWL_UCODE_INIT
) {
730 base
= nic
->init_evtlog_ptr
;
733 base
= nic
->inst_evtlog_ptr
;
737 event_size
= 2 * sizeof(u32
);
739 event_size
= 3 * sizeof(u32
);
741 ptr
= base
+ EVENT_START_OFFSET
+ (start_idx
* event_size
);
743 /* Make sure device is powered up for SRAM reads */
744 spin_lock_irqsave(&trans
->reg_lock
, reg_flags
);
745 iwl_grab_nic_access(trans
);
747 /* Set starting address; reads will auto-increment */
748 iwl_write32(trans
, HBUS_TARG_MEM_RADDR
, ptr
);
751 /* "time" is actually "data" for mode 0 (no timestamp).
752 * place event id # at far right for easier visual parsing. */
753 for (i
= 0; i
< num_events
; i
++) {
754 ev
= iwl_read32(trans
, HBUS_TARG_MEM_RDAT
);
755 time
= iwl_read32(trans
, HBUS_TARG_MEM_RDAT
);
759 pos
+= scnprintf(*buf
+ pos
, bufsz
- pos
,
760 "EVT_LOG:0x%08x:%04u\n",
763 trace_iwlwifi_dev_ucode_event(priv(trans
), 0,
765 IWL_ERR(trans
, "EVT_LOG:0x%08x:%04u\n",
769 data
= iwl_read32(trans
, HBUS_TARG_MEM_RDAT
);
771 pos
+= scnprintf(*buf
+ pos
, bufsz
- pos
,
772 "EVT_LOGT:%010u:0x%08x:%04u\n",
775 IWL_ERR(trans
, "EVT_LOGT:%010u:0x%08x:%04u\n",
777 trace_iwlwifi_dev_ucode_event(priv(trans
), time
,
783 /* Allow device to power down */
784 iwl_release_nic_access(trans
);
785 spin_unlock_irqrestore(&trans
->reg_lock
, reg_flags
);
790 * iwl_print_last_event_logs - Dump the newest # of event log to syslog
792 static int iwl_print_last_event_logs(struct iwl_trans
*trans
, u32 capacity
,
793 u32 num_wraps
, u32 next_entry
,
795 int pos
, char **buf
, size_t bufsz
)
798 * display the newest DEFAULT_LOG_ENTRIES entries
799 * i.e the entries just before the next ont that uCode would fill.
802 if (next_entry
< size
) {
803 pos
= iwl_print_event_log(trans
,
804 capacity
- (size
- next_entry
),
805 size
- next_entry
, mode
,
807 pos
= iwl_print_event_log(trans
, 0,
811 pos
= iwl_print_event_log(trans
, next_entry
- size
,
812 size
, mode
, pos
, buf
, bufsz
);
814 if (next_entry
< size
) {
815 pos
= iwl_print_event_log(trans
, 0, next_entry
,
816 mode
, pos
, buf
, bufsz
);
818 pos
= iwl_print_event_log(trans
, next_entry
- size
,
819 size
, mode
, pos
, buf
, bufsz
);
825 #define DEFAULT_DUMP_EVENT_LOG_ENTRIES (20)
827 int iwl_dump_nic_event_log(struct iwl_trans
*trans
, bool full_log
,
828 char **buf
, bool display
)
830 u32 base
; /* SRAM byte address of event log header */
831 u32 capacity
; /* event log capacity in # entries */
832 u32 mode
; /* 0 - no timestamp, 1 - timestamp recorded */
833 u32 num_wraps
; /* # times uCode wrapped to top of log */
834 u32 next_entry
; /* index of next entry to be written by uCode */
835 u32 size
; /* # entries that we'll print */
839 struct iwl_nic
*nic
= nic(trans
);
841 base
= trans
->shrd
->device_pointers
.log_event_table
;
842 if (trans
->shrd
->ucode_type
== IWL_UCODE_INIT
) {
843 logsize
= nic
->init_evtlog_size
;
845 base
= nic
->init_evtlog_ptr
;
847 logsize
= nic
->inst_evtlog_size
;
849 base
= nic
->inst_evtlog_ptr
;
852 if (!iwlagn_hw_valid_rtc_data_addr(base
)) {
854 "Invalid event log pointer 0x%08X for %s uCode\n",
856 (trans
->shrd
->ucode_type
== IWL_UCODE_INIT
)
861 /* event log header */
862 capacity
= iwl_read_targ_mem(trans
, base
);
863 mode
= iwl_read_targ_mem(trans
, base
+ (1 * sizeof(u32
)));
864 num_wraps
= iwl_read_targ_mem(trans
, base
+ (2 * sizeof(u32
)));
865 next_entry
= iwl_read_targ_mem(trans
, base
+ (3 * sizeof(u32
)));
867 if (capacity
> logsize
) {
868 IWL_ERR(trans
, "Log capacity %d is bogus, limit to %d "
869 "entries\n", capacity
, logsize
);
873 if (next_entry
> logsize
) {
874 IWL_ERR(trans
, "Log write index %d is bogus, limit to %d\n",
875 next_entry
, logsize
);
876 next_entry
= logsize
;
879 size
= num_wraps
? capacity
: next_entry
;
881 /* bail out if nothing in log */
883 IWL_ERR(trans
, "Start IWL Event Log Dump: nothing in log\n");
887 #ifdef CONFIG_IWLWIFI_DEBUG
888 if (!(iwl_get_debug_level(trans
->shrd
) & IWL_DL_FW_ERRORS
) && !full_log
)
889 size
= (size
> DEFAULT_DUMP_EVENT_LOG_ENTRIES
)
890 ? DEFAULT_DUMP_EVENT_LOG_ENTRIES
: size
;
892 size
= (size
> DEFAULT_DUMP_EVENT_LOG_ENTRIES
)
893 ? DEFAULT_DUMP_EVENT_LOG_ENTRIES
: size
;
895 IWL_ERR(trans
, "Start IWL Event Log Dump: display last %u entries\n",
898 #ifdef CONFIG_IWLWIFI_DEBUG
901 bufsz
= capacity
* 48;
904 *buf
= kmalloc(bufsz
, GFP_KERNEL
);
908 if ((iwl_get_debug_level(trans
->shrd
) & IWL_DL_FW_ERRORS
) || full_log
) {
910 * if uCode has wrapped back to top of log,
911 * start at the oldest entry,
912 * i.e the next one that uCode would fill.
915 pos
= iwl_print_event_log(trans
, next_entry
,
916 capacity
- next_entry
, mode
,
918 /* (then/else) start at top of log */
919 pos
= iwl_print_event_log(trans
, 0,
920 next_entry
, mode
, pos
, buf
, bufsz
);
922 pos
= iwl_print_last_event_logs(trans
, capacity
, num_wraps
,
923 next_entry
, size
, mode
,
926 pos
= iwl_print_last_event_logs(trans
, capacity
, num_wraps
,
927 next_entry
, size
, mode
,
933 /* tasklet for iwlagn interrupt */
934 void iwl_irq_tasklet(struct iwl_trans
*trans
)
940 #ifdef CONFIG_IWLWIFI_DEBUG
944 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
945 struct isr_statistics
*isr_stats
= &trans_pcie
->isr_stats
;
948 spin_lock_irqsave(&trans_pcie
->irq_lock
, flags
);
950 /* Ack/clear/reset pending uCode interrupts.
951 * Note: Some bits in CSR_INT are "OR" of bits in CSR_FH_INT_STATUS,
953 /* There is a hardware bug in the interrupt mask function that some
954 * interrupts (i.e. CSR_INT_BIT_SCD) can still be generated even if
955 * they are disabled in the CSR_INT_MASK register. Furthermore the
956 * ICT interrupt handling mechanism has another bug that might cause
957 * these unmasked interrupts fail to be detected. We workaround the
958 * hardware bugs here by ACKing all the possible interrupts so that
959 * interrupt coalescing can still be achieved.
961 iwl_write32(trans
, CSR_INT
,
962 trans_pcie
->inta
| ~trans_pcie
->inta_mask
);
964 inta
= trans_pcie
->inta
;
966 #ifdef CONFIG_IWLWIFI_DEBUG
967 if (iwl_get_debug_level(trans
->shrd
) & IWL_DL_ISR
) {
969 inta_mask
= iwl_read32(trans
, CSR_INT_MASK
);
970 IWL_DEBUG_ISR(trans
, "inta 0x%08x, enabled 0x%08x\n ",
975 /* saved interrupt in inta variable now we can reset trans_pcie->inta */
976 trans_pcie
->inta
= 0;
978 spin_unlock_irqrestore(&trans_pcie
->irq_lock
, flags
);
980 /* Now service all interrupt bits discovered above. */
981 if (inta
& CSR_INT_BIT_HW_ERR
) {
982 IWL_ERR(trans
, "Hardware error detected. Restarting.\n");
984 /* Tell the device to stop sending interrupts */
985 iwl_disable_interrupts(trans
);
988 iwl_irq_handle_error(trans
);
990 handled
|= CSR_INT_BIT_HW_ERR
;
995 #ifdef CONFIG_IWLWIFI_DEBUG
996 if (iwl_get_debug_level(trans
->shrd
) & (IWL_DL_ISR
)) {
997 /* NIC fires this, but we don't use it, redundant with WAKEUP */
998 if (inta
& CSR_INT_BIT_SCD
) {
999 IWL_DEBUG_ISR(trans
, "Scheduler finished to transmit "
1000 "the frame/frames.\n");
1004 /* Alive notification via Rx interrupt will do the real work */
1005 if (inta
& CSR_INT_BIT_ALIVE
) {
1006 IWL_DEBUG_ISR(trans
, "Alive interrupt\n");
1011 /* Safely ignore these bits for debug checks below */
1012 inta
&= ~(CSR_INT_BIT_SCD
| CSR_INT_BIT_ALIVE
);
1014 /* HW RF KILL switch toggled */
1015 if (inta
& CSR_INT_BIT_RF_KILL
) {
1017 if (!(iwl_read32(trans
, CSR_GP_CNTRL
) &
1018 CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW
))
1021 IWL_WARN(trans
, "RF_KILL bit toggled to %s.\n",
1022 hw_rf_kill
? "disable radio" : "enable radio");
1024 isr_stats
->rfkill
++;
1026 /* driver only loads ucode once setting the interface up.
1027 * the driver allows loading the ucode even if the radio
1028 * is killed. Hence update the killswitch state here. The
1029 * rfkill handler will care about restarting if needed.
1031 if (!test_bit(STATUS_ALIVE
, &trans
->shrd
->status
)) {
1033 set_bit(STATUS_RF_KILL_HW
,
1034 &trans
->shrd
->status
);
1036 clear_bit(STATUS_RF_KILL_HW
,
1037 &trans
->shrd
->status
);
1038 iwl_op_mode_hw_rf_kill(trans
->op_mode
, hw_rf_kill
);
1041 handled
|= CSR_INT_BIT_RF_KILL
;
1044 /* Chip got too hot and stopped itself */
1045 if (inta
& CSR_INT_BIT_CT_KILL
) {
1046 IWL_ERR(trans
, "Microcode CT kill error detected.\n");
1047 isr_stats
->ctkill
++;
1048 handled
|= CSR_INT_BIT_CT_KILL
;
1051 /* Error detected by uCode */
1052 if (inta
& CSR_INT_BIT_SW_ERR
) {
1053 IWL_ERR(trans
, "Microcode SW error detected. "
1054 " Restarting 0x%X.\n", inta
);
1056 iwl_irq_handle_error(trans
);
1057 handled
|= CSR_INT_BIT_SW_ERR
;
1060 /* uCode wakes up after power-down sleep */
1061 if (inta
& CSR_INT_BIT_WAKEUP
) {
1062 IWL_DEBUG_ISR(trans
, "Wakeup interrupt\n");
1063 iwl_rx_queue_update_write_ptr(trans
, &trans_pcie
->rxq
);
1064 for (i
= 0; i
< hw_params(trans
).max_txq_num
; i
++)
1065 iwl_txq_update_write_ptr(trans
,
1066 &trans_pcie
->txq
[i
]);
1068 isr_stats
->wakeup
++;
1070 handled
|= CSR_INT_BIT_WAKEUP
;
1073 /* All uCode command responses, including Tx command responses,
1074 * Rx "responses" (frame-received notification), and other
1075 * notifications from uCode come through here*/
1076 if (inta
& (CSR_INT_BIT_FH_RX
| CSR_INT_BIT_SW_RX
|
1077 CSR_INT_BIT_RX_PERIODIC
)) {
1078 IWL_DEBUG_ISR(trans
, "Rx interrupt\n");
1079 if (inta
& (CSR_INT_BIT_FH_RX
| CSR_INT_BIT_SW_RX
)) {
1080 handled
|= (CSR_INT_BIT_FH_RX
| CSR_INT_BIT_SW_RX
);
1081 iwl_write32(trans
, CSR_FH_INT_STATUS
,
1082 CSR_FH_INT_RX_MASK
);
1084 if (inta
& CSR_INT_BIT_RX_PERIODIC
) {
1085 handled
|= CSR_INT_BIT_RX_PERIODIC
;
1087 CSR_INT
, CSR_INT_BIT_RX_PERIODIC
);
1089 /* Sending RX interrupt require many steps to be done in the
1091 * 1- write interrupt to current index in ICT table.
1093 * 3- update RX shared data to indicate last write index.
1094 * 4- send interrupt.
1095 * This could lead to RX race, driver could receive RX interrupt
1096 * but the shared data changes does not reflect this;
1097 * periodic interrupt will detect any dangling Rx activity.
1100 /* Disable periodic interrupt; we use it as just a one-shot. */
1101 iwl_write8(trans
, CSR_INT_PERIODIC_REG
,
1102 CSR_INT_PERIODIC_DIS
);
1103 #ifdef CONFIG_IWLWIFI_IDI
1104 iwl_amfh_rx_handler();
1106 iwl_rx_handle(trans
);
1109 * Enable periodic interrupt in 8 msec only if we received
1110 * real RX interrupt (instead of just periodic int), to catch
1111 * any dangling Rx interrupt. If it was just the periodic
1112 * interrupt, there was no dangling Rx activity, and no need
1113 * to extend the periodic interrupt; one-shot is enough.
1115 if (inta
& (CSR_INT_BIT_FH_RX
| CSR_INT_BIT_SW_RX
))
1116 iwl_write8(trans
, CSR_INT_PERIODIC_REG
,
1117 CSR_INT_PERIODIC_ENA
);
1122 /* This "Tx" DMA channel is used only for loading uCode */
1123 if (inta
& CSR_INT_BIT_FH_TX
) {
1124 iwl_write32(trans
, CSR_FH_INT_STATUS
, CSR_FH_INT_TX_MASK
);
1125 IWL_DEBUG_ISR(trans
, "uCode load interrupt\n");
1127 handled
|= CSR_INT_BIT_FH_TX
;
1128 /* Wake up uCode load routine, now that load is complete */
1129 trans
->ucode_write_complete
= 1;
1130 wake_up(&trans
->shrd
->wait_command_queue
);
1133 if (inta
& ~handled
) {
1134 IWL_ERR(trans
, "Unhandled INTA bits 0x%08x\n", inta
& ~handled
);
1135 isr_stats
->unhandled
++;
1138 if (inta
& ~(trans_pcie
->inta_mask
)) {
1139 IWL_WARN(trans
, "Disabled INTA bits 0x%08x were pending\n",
1140 inta
& ~trans_pcie
->inta_mask
);
1143 /* Re-enable all interrupts */
1144 /* only Re-enable if disabled by irq */
1145 if (test_bit(STATUS_INT_ENABLED
, &trans
->shrd
->status
))
1146 iwl_enable_interrupts(trans
);
1147 /* Re-enable RF_KILL if it occurred */
1148 else if (handled
& CSR_INT_BIT_RF_KILL
) {
1149 IWL_DEBUG_ISR(trans
, "Enabling rfkill interrupt\n");
1150 iwl_write32(trans
, CSR_INT_MASK
, CSR_INT_BIT_RF_KILL
);
1154 /******************************************************************************
1158 ******************************************************************************/
1160 /* a device (PCI-E) page is 4096 bytes long */
1161 #define ICT_SHIFT 12
1162 #define ICT_SIZE (1 << ICT_SHIFT)
1163 #define ICT_COUNT (ICT_SIZE / sizeof(u32))
1165 /* Free dram table */
1166 void iwl_free_isr_ict(struct iwl_trans
*trans
)
1168 struct iwl_trans_pcie
*trans_pcie
=
1169 IWL_TRANS_GET_PCIE_TRANS(trans
);
1171 if (trans_pcie
->ict_tbl
) {
1172 dma_free_coherent(trans
->dev
, ICT_SIZE
,
1173 trans_pcie
->ict_tbl
,
1174 trans_pcie
->ict_tbl_dma
);
1175 trans_pcie
->ict_tbl
= NULL
;
1176 trans_pcie
->ict_tbl_dma
= 0;
1182 * allocate dram shared table, it is an aligned memory
1183 * block of ICT_SIZE.
1184 * also reset all data related to ICT table interrupt.
1186 int iwl_alloc_isr_ict(struct iwl_trans
*trans
)
1188 struct iwl_trans_pcie
*trans_pcie
=
1189 IWL_TRANS_GET_PCIE_TRANS(trans
);
1191 trans_pcie
->ict_tbl
=
1192 dma_alloc_coherent(trans
->dev
, ICT_SIZE
,
1193 &trans_pcie
->ict_tbl_dma
,
1195 if (!trans_pcie
->ict_tbl
)
1198 /* just an API sanity check ... it is guaranteed to be aligned */
1199 if (WARN_ON(trans_pcie
->ict_tbl_dma
& (ICT_SIZE
- 1))) {
1200 iwl_free_isr_ict(trans
);
1204 IWL_DEBUG_ISR(trans
, "ict dma addr %Lx\n",
1205 (unsigned long long)trans_pcie
->ict_tbl_dma
);
1207 IWL_DEBUG_ISR(trans
, "ict vir addr %p\n", trans_pcie
->ict_tbl
);
1209 /* reset table and index to all 0 */
1210 memset(trans_pcie
->ict_tbl
, 0, ICT_SIZE
);
1211 trans_pcie
->ict_index
= 0;
1213 /* add periodic RX interrupt */
1214 trans_pcie
->inta_mask
|= CSR_INT_BIT_RX_PERIODIC
;
1218 /* Device is going up inform it about using ICT interrupt table,
1219 * also we need to tell the driver to start using ICT interrupt.
1221 void iwl_reset_ict(struct iwl_trans
*trans
)
1224 unsigned long flags
;
1225 struct iwl_trans_pcie
*trans_pcie
=
1226 IWL_TRANS_GET_PCIE_TRANS(trans
);
1228 if (!trans_pcie
->ict_tbl
)
1231 spin_lock_irqsave(&trans_pcie
->irq_lock
, flags
);
1232 iwl_disable_interrupts(trans
);
1234 memset(trans_pcie
->ict_tbl
, 0, ICT_SIZE
);
1236 val
= trans_pcie
->ict_tbl_dma
>> ICT_SHIFT
;
1238 val
|= CSR_DRAM_INT_TBL_ENABLE
;
1239 val
|= CSR_DRAM_INIT_TBL_WRAP_CHECK
;
1241 IWL_DEBUG_ISR(trans
, "CSR_DRAM_INT_TBL_REG =0x%x\n", val
);
1243 iwl_write32(trans
, CSR_DRAM_INT_TBL_REG
, val
);
1244 trans_pcie
->use_ict
= true;
1245 trans_pcie
->ict_index
= 0;
1246 iwl_write32(trans
, CSR_INT
, trans_pcie
->inta_mask
);
1247 iwl_enable_interrupts(trans
);
1248 spin_unlock_irqrestore(&trans_pcie
->irq_lock
, flags
);
1251 /* Device is going down disable ict interrupt usage */
1252 void iwl_disable_ict(struct iwl_trans
*trans
)
1254 struct iwl_trans_pcie
*trans_pcie
=
1255 IWL_TRANS_GET_PCIE_TRANS(trans
);
1257 unsigned long flags
;
1259 spin_lock_irqsave(&trans_pcie
->irq_lock
, flags
);
1260 trans_pcie
->use_ict
= false;
1261 spin_unlock_irqrestore(&trans_pcie
->irq_lock
, flags
);
1264 static irqreturn_t
iwl_isr(int irq
, void *data
)
1266 struct iwl_trans
*trans
= data
;
1267 struct iwl_trans_pcie
*trans_pcie
;
1268 u32 inta
, inta_mask
;
1269 unsigned long flags
;
1270 #ifdef CONFIG_IWLWIFI_DEBUG
1276 trace_iwlwifi_dev_irq(priv(trans
));
1278 trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
1280 spin_lock_irqsave(&trans_pcie
->irq_lock
, flags
);
1282 /* Disable (but don't clear!) interrupts here to avoid
1283 * back-to-back ISRs and sporadic interrupts from our NIC.
1284 * If we have something to service, the tasklet will re-enable ints.
1285 * If we *don't* have something, we'll re-enable before leaving here. */
1286 inta_mask
= iwl_read32(trans
, CSR_INT_MASK
); /* just for debug */
1287 iwl_write32(trans
, CSR_INT_MASK
, 0x00000000);
1289 /* Discover which interrupts are active/pending */
1290 inta
= iwl_read32(trans
, CSR_INT
);
1292 /* Ignore interrupt if there's nothing in NIC to service.
1293 * This may be due to IRQ shared with another device,
1294 * or due to sporadic interrupts thrown from our NIC. */
1296 IWL_DEBUG_ISR(trans
, "Ignore interrupt, inta == 0\n");
1300 if ((inta
== 0xFFFFFFFF) || ((inta
& 0xFFFFFFF0) == 0xa5a5a5a0)) {
1301 /* Hardware disappeared. It might have already raised
1303 IWL_WARN(trans
, "HARDWARE GONE?? INTA == 0x%08x\n", inta
);
1307 #ifdef CONFIG_IWLWIFI_DEBUG
1308 if (iwl_get_debug_level(trans
->shrd
) & (IWL_DL_ISR
)) {
1309 inta_fh
= iwl_read32(trans
, CSR_FH_INT_STATUS
);
1310 IWL_DEBUG_ISR(trans
, "ISR inta 0x%08x, enabled 0x%08x, "
1311 "fh 0x%08x\n", inta
, inta_mask
, inta_fh
);
1315 trans_pcie
->inta
|= inta
;
1316 /* iwl_irq_tasklet() will service interrupts and re-enable them */
1318 tasklet_schedule(&trans_pcie
->irq_tasklet
);
1319 else if (test_bit(STATUS_INT_ENABLED
, &trans
->shrd
->status
) &&
1321 iwl_enable_interrupts(trans
);
1324 spin_unlock_irqrestore(&trans_pcie
->irq_lock
, flags
);
1328 /* re-enable interrupts here since we don't have anything to service. */
1329 /* only Re-enable if disabled by irq and no schedules tasklet. */
1330 if (test_bit(STATUS_INT_ENABLED
, &trans
->shrd
->status
) &&
1332 iwl_enable_interrupts(trans
);
1334 spin_unlock_irqrestore(&trans_pcie
->irq_lock
, flags
);
1338 /* interrupt handler using ict table, with this interrupt driver will
1339 * stop using INTA register to get device's interrupt, reading this register
1340 * is expensive, device will write interrupts in ICT dram table, increment
1341 * index then will fire interrupt to driver, driver will OR all ICT table
1342 * entries from current index up to table entry with 0 value. the result is
1343 * the interrupt we need to service, driver will set the entries back to 0 and
1346 irqreturn_t
iwl_isr_ict(int irq
, void *data
)
1348 struct iwl_trans
*trans
= data
;
1349 struct iwl_trans_pcie
*trans_pcie
;
1350 u32 inta
, inta_mask
;
1353 unsigned long flags
;
1358 trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
1360 /* dram interrupt table not set yet,
1361 * use legacy interrupt.
1363 if (!trans_pcie
->use_ict
)
1364 return iwl_isr(irq
, data
);
1366 trace_iwlwifi_dev_irq(priv(trans
));
1368 spin_lock_irqsave(&trans_pcie
->irq_lock
, flags
);
1370 /* Disable (but don't clear!) interrupts here to avoid
1371 * back-to-back ISRs and sporadic interrupts from our NIC.
1372 * If we have something to service, the tasklet will re-enable ints.
1373 * If we *don't* have something, we'll re-enable before leaving here.
1375 inta_mask
= iwl_read32(trans
, CSR_INT_MASK
); /* just for debug */
1376 iwl_write32(trans
, CSR_INT_MASK
, 0x00000000);
1379 /* Ignore interrupt if there's nothing in NIC to service.
1380 * This may be due to IRQ shared with another device,
1381 * or due to sporadic interrupts thrown from our NIC. */
1382 read
= le32_to_cpu(trans_pcie
->ict_tbl
[trans_pcie
->ict_index
]);
1383 trace_iwlwifi_dev_ict_read(priv(trans
), trans_pcie
->ict_index
, read
);
1385 IWL_DEBUG_ISR(trans
, "Ignore interrupt, inta == 0\n");
1390 * Collect all entries up to the first 0, starting from ict_index;
1391 * note we already read at ict_index.
1395 IWL_DEBUG_ISR(trans
, "ICT index %d value 0x%08X\n",
1396 trans_pcie
->ict_index
, read
);
1397 trans_pcie
->ict_tbl
[trans_pcie
->ict_index
] = 0;
1398 trans_pcie
->ict_index
=
1399 iwl_queue_inc_wrap(trans_pcie
->ict_index
, ICT_COUNT
);
1401 read
= le32_to_cpu(trans_pcie
->ict_tbl
[trans_pcie
->ict_index
]);
1402 trace_iwlwifi_dev_ict_read(priv(trans
), trans_pcie
->ict_index
,
1406 /* We should not get this value, just ignore it. */
1407 if (val
== 0xffffffff)
1411 * this is a w/a for a h/w bug. the h/w bug may cause the Rx bit
1412 * (bit 15 before shifting it to 31) to clear when using interrupt
1413 * coalescing. fortunately, bits 18 and 19 stay set when this happens
1414 * so we use them to decide on the real state of the Rx bit.
1415 * In order words, bit 15 is set if bit 18 or bit 19 are set.
1420 inta
= (0xff & val
) | ((0xff00 & val
) << 16);
1421 IWL_DEBUG_ISR(trans
, "ISR inta 0x%08x, enabled 0x%08x ict 0x%08x\n",
1422 inta
, inta_mask
, val
);
1424 inta
&= trans_pcie
->inta_mask
;
1425 trans_pcie
->inta
|= inta
;
1427 /* iwl_irq_tasklet() will service interrupts and re-enable them */
1429 tasklet_schedule(&trans_pcie
->irq_tasklet
);
1430 else if (test_bit(STATUS_INT_ENABLED
, &trans
->shrd
->status
) &&
1431 !trans_pcie
->inta
) {
1432 /* Allow interrupt if was disabled by this handler and
1433 * no tasklet was schedules, We should not enable interrupt,
1434 * tasklet will enable it.
1436 iwl_enable_interrupts(trans
);
1439 spin_unlock_irqrestore(&trans_pcie
->irq_lock
, flags
);
1443 /* re-enable interrupts here since we don't have anything to service.
1444 * only Re-enable if disabled by irq.
1446 if (test_bit(STATUS_INT_ENABLED
, &trans
->shrd
->status
) &&
1448 iwl_enable_interrupts(trans
);
1450 spin_unlock_irqrestore(&trans_pcie
->irq_lock
, flags
);