3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2013-2014, Intel Corporation.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 #include <linux/pci.h>
18 #include <linux/jiffies.h>
19 #include <linux/delay.h>
20 #include <linux/kthread.h>
21 #include <linux/irqreturn.h>
23 #include <linux/mei.h>
31 * mei_txe_reg_read - Reads 32bit data from the device
33 * @base_addr: registers base address
34 * @offset: register offset
37 static inline u32 mei_txe_reg_read(void __iomem *base_addr,
40 return ioread32(base_addr + offset);
44 * mei_txe_reg_write - Writes 32bit data to the device
46 * @base_addr: registers base address
47 * @offset: register offset
48 * @value: the value to write
50 static inline void mei_txe_reg_write(void __iomem *base_addr,
51 unsigned long offset, u32 value)
53 iowrite32(value, base_addr + offset);
57 * mei_txe_sec_reg_read_silent - Reads 32bit data from the SeC BAR
59 * @dev: the device structure
60 * @offset: register offset
62 * Doesn't check for aliveness while Reads 32bit data from the SeC BAR
64 static inline u32 mei_txe_sec_reg_read_silent(struct mei_txe_hw *hw,
67 return mei_txe_reg_read(hw->mem_addr[SEC_BAR], offset);
71 * mei_txe_sec_reg_read - Reads 32bit data from the SeC BAR
73 * @dev: the device structure
74 * @offset: register offset
76 * Reads 32bit data from the SeC BAR and shout loud if aliveness is not set
78 static inline u32 mei_txe_sec_reg_read(struct mei_txe_hw *hw,
81 WARN(!hw->aliveness, "sec read: aliveness not asserted\n");
82 return mei_txe_sec_reg_read_silent(hw, offset);
85 * mei_txe_sec_reg_write_silent - Writes 32bit data to the SeC BAR
86 * doesn't check for aliveness
88 * @dev: the device structure
89 * @offset: register offset
90 * @value: value to write
92 * Doesn't check for aliveness while writes 32bit data from to the SeC BAR
94 static inline void mei_txe_sec_reg_write_silent(struct mei_txe_hw *hw,
95 unsigned long offset, u32 value)
97 mei_txe_reg_write(hw->mem_addr[SEC_BAR], offset, value);
101 * mei_txe_sec_reg_write - Writes 32bit data to the SeC BAR
103 * @dev: the device structure
104 * @offset: register offset
105 * @value: value to write
107 * Writes 32bit data from the SeC BAR and shout loud if aliveness is not set
109 static inline void mei_txe_sec_reg_write(struct mei_txe_hw *hw,
110 unsigned long offset, u32 value)
112 WARN(!hw->aliveness, "sec write: aliveness not asserted\n");
113 mei_txe_sec_reg_write_silent(hw, offset, value);
116 * mei_txe_br_reg_read - Reads 32bit data from the Bridge BAR
118 * @hw: the device structure
119 * @offset: offset from which to read the data
122 static inline u32 mei_txe_br_reg_read(struct mei_txe_hw *hw,
123 unsigned long offset)
125 return mei_txe_reg_read(hw->mem_addr[BRIDGE_BAR], offset);
129 * mei_txe_br_reg_write - Writes 32bit data to the Bridge BAR
131 * @hw: the device structure
132 * @offset: offset from which to write the data
133 * @value: the byte to write
135 static inline void mei_txe_br_reg_write(struct mei_txe_hw *hw,
136 unsigned long offset, u32 value)
138 mei_txe_reg_write(hw->mem_addr[BRIDGE_BAR], offset, value);
142 * mei_txe_aliveness_set - request for aliveness change
144 * @dev: the device structure
145 * @req: requested aliveness value
147 * Request for aliveness change and returns true if the change is
148 * really needed and false if aliveness is already
149 * in the requested state
150 * Requires device lock to be held
152 static bool mei_txe_aliveness_set(struct mei_device *dev, u32 req)
155 struct mei_txe_hw *hw = to_txe_hw(dev);
156 bool do_req = hw->aliveness != req;
158 dev_dbg(&dev->pdev->dev, "Aliveness current=%d request=%d\n",
161 dev->pg_event = MEI_PG_EVENT_WAIT;
162 mei_txe_br_reg_write(hw, SICR_HOST_ALIVENESS_REQ_REG, req);
169 * mei_txe_aliveness_req_get - get aliveness requested register value
171 * @dev: the device structure
173 * Extract HICR_HOST_ALIVENESS_RESP_ACK bit from
174 * from HICR_HOST_ALIVENESS_REQ register value
176 static u32 mei_txe_aliveness_req_get(struct mei_device *dev)
178 struct mei_txe_hw *hw = to_txe_hw(dev);
180 reg = mei_txe_br_reg_read(hw, SICR_HOST_ALIVENESS_REQ_REG);
181 return reg & SICR_HOST_ALIVENESS_REQ_REQUESTED;
185 * mei_txe_aliveness_get - get aliveness response register value
186 * @dev: the device structure
188 * Extract HICR_HOST_ALIVENESS_RESP_ACK bit
189 * from HICR_HOST_ALIVENESS_RESP register value
191 static u32 mei_txe_aliveness_get(struct mei_device *dev)
193 struct mei_txe_hw *hw = to_txe_hw(dev);
195 reg = mei_txe_br_reg_read(hw, HICR_HOST_ALIVENESS_RESP_REG);
196 return reg & HICR_HOST_ALIVENESS_RESP_ACK;
200 * mei_txe_aliveness_poll - waits for aliveness to settle
202 * @dev: the device structure
203 * @expected: expected aliveness value
205 * Polls for HICR_HOST_ALIVENESS_RESP.ALIVENESS_RESP to be set
206 * returns > 0 if the expected value was received, -ETIME otherwise
208 static int mei_txe_aliveness_poll(struct mei_device *dev, u32 expected)
210 struct mei_txe_hw *hw = to_txe_hw(dev);
214 hw->aliveness = mei_txe_aliveness_get(dev);
215 if (hw->aliveness == expected) {
216 dev->pg_event = MEI_PG_EVENT_IDLE;
217 dev_dbg(&dev->pdev->dev,
218 "aliveness settled after %d msecs\n", t);
221 mutex_unlock(&dev->device_lock);
222 msleep(MSEC_PER_SEC / 5);
223 mutex_lock(&dev->device_lock);
224 t += MSEC_PER_SEC / 5;
225 } while (t < SEC_ALIVENESS_WAIT_TIMEOUT);
227 dev->pg_event = MEI_PG_EVENT_IDLE;
228 dev_err(&dev->pdev->dev, "aliveness timed out\n");
233 * mei_txe_aliveness_wait - waits for aliveness to settle
235 * @dev: the device structure
236 * @expected: expected aliveness value
238 * Waits for HICR_HOST_ALIVENESS_RESP.ALIVENESS_RESP to be set
239 * returns returns 0 on success and < 0 otherwise
241 static int mei_txe_aliveness_wait(struct mei_device *dev, u32 expected)
243 struct mei_txe_hw *hw = to_txe_hw(dev);
244 const unsigned long timeout =
245 msecs_to_jiffies(SEC_ALIVENESS_WAIT_TIMEOUT);
249 hw->aliveness = mei_txe_aliveness_get(dev);
250 if (hw->aliveness == expected)
253 mutex_unlock(&dev->device_lock);
254 err = wait_event_timeout(hw->wait_aliveness_resp,
255 dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout);
256 mutex_lock(&dev->device_lock);
258 hw->aliveness = mei_txe_aliveness_get(dev);
259 ret = hw->aliveness == expected ? 0 : -ETIME;
262 dev_warn(&dev->pdev->dev, "aliveness timed out = %ld aliveness = %d event = %d\n",
263 err, hw->aliveness, dev->pg_event);
265 dev_dbg(&dev->pdev->dev, "aliveness settled after = %d msec aliveness = %d event = %d\n",
266 jiffies_to_msecs(timeout - err),
267 hw->aliveness, dev->pg_event);
269 dev->pg_event = MEI_PG_EVENT_IDLE;
274 * mei_txe_aliveness_set_sync - sets an wait for aliveness to complete
276 * @dev: the device structure
278 * returns returns 0 on success and < 0 otherwise
280 int mei_txe_aliveness_set_sync(struct mei_device *dev, u32 req)
282 if (mei_txe_aliveness_set(dev, req))
283 return mei_txe_aliveness_wait(dev, req);
288 * mei_txe_pg_is_enabled - detect if PG is supported by HW
290 * @dev: the device structure
292 * returns: true is pg supported, false otherwise
294 static bool mei_txe_pg_is_enabled(struct mei_device *dev)
300 * mei_txe_pg_state - translate aliveness register value
301 * to the mei power gating state
303 * @dev: the device structure
305 * returns: MEI_PG_OFF if aliveness is on and MEI_PG_ON otherwise
307 static inline enum mei_pg_state mei_txe_pg_state(struct mei_device *dev)
309 struct mei_txe_hw *hw = to_txe_hw(dev);
310 return hw->aliveness ? MEI_PG_OFF : MEI_PG_ON;
314 * mei_txe_input_ready_interrupt_enable - sets the Input Ready Interrupt
316 * @dev: the device structure
318 static void mei_txe_input_ready_interrupt_enable(struct mei_device *dev)
320 struct mei_txe_hw *hw = to_txe_hw(dev);
322 /* Enable the SEC_IPC_HOST_INT_MASK_IN_RDY interrupt */
323 hintmsk = mei_txe_sec_reg_read(hw, SEC_IPC_HOST_INT_MASK_REG);
324 hintmsk |= SEC_IPC_HOST_INT_MASK_IN_RDY;
325 mei_txe_sec_reg_write(hw, SEC_IPC_HOST_INT_MASK_REG, hintmsk);
329 * mei_txe_input_doorbell_set
330 * - Sets bit 0 in SEC_IPC_INPUT_DOORBELL.IPC_INPUT_DOORBELL.
331 * @dev: the device structure
333 static void mei_txe_input_doorbell_set(struct mei_txe_hw *hw)
335 /* Clear the interrupt cause */
336 clear_bit(TXE_INTR_IN_READY_BIT, &hw->intr_cause);
337 mei_txe_sec_reg_write(hw, SEC_IPC_INPUT_DOORBELL_REG, 1);
341 * mei_txe_output_ready_set - Sets the SICR_SEC_IPC_OUTPUT_STATUS bit to 1
343 * @dev: the device structure
345 static void mei_txe_output_ready_set(struct mei_txe_hw *hw)
347 mei_txe_br_reg_write(hw,
348 SICR_SEC_IPC_OUTPUT_STATUS_REG,
349 SEC_IPC_OUTPUT_STATUS_RDY);
353 * mei_txe_is_input_ready - check if TXE is ready for receiving data
355 * @dev: the device structure
357 static bool mei_txe_is_input_ready(struct mei_device *dev)
359 struct mei_txe_hw *hw = to_txe_hw(dev);
361 status = mei_txe_sec_reg_read(hw, SEC_IPC_INPUT_STATUS_REG);
362 return !!(SEC_IPC_INPUT_STATUS_RDY & status);
366 * mei_txe_intr_clear - clear all interrupts
368 * @dev: the device structure
370 static inline void mei_txe_intr_clear(struct mei_device *dev)
372 struct mei_txe_hw *hw = to_txe_hw(dev);
373 mei_txe_sec_reg_write_silent(hw, SEC_IPC_HOST_INT_STATUS_REG,
374 SEC_IPC_HOST_INT_STATUS_PENDING);
375 mei_txe_br_reg_write(hw, HISR_REG, HISR_INT_STS_MSK);
376 mei_txe_br_reg_write(hw, HHISR_REG, IPC_HHIER_MSK);
380 * mei_txe_intr_disable - disable all interrupts
382 * @dev: the device structure
384 static void mei_txe_intr_disable(struct mei_device *dev)
386 struct mei_txe_hw *hw = to_txe_hw(dev);
387 mei_txe_br_reg_write(hw, HHIER_REG, 0);
388 mei_txe_br_reg_write(hw, HIER_REG, 0);
391 * mei_txe_intr_disable - enable all interrupts
393 * @dev: the device structure
395 static void mei_txe_intr_enable(struct mei_device *dev)
397 struct mei_txe_hw *hw = to_txe_hw(dev);
398 mei_txe_br_reg_write(hw, HHIER_REG, IPC_HHIER_MSK);
399 mei_txe_br_reg_write(hw, HIER_REG, HIER_INT_EN_MSK);
403 * mei_txe_pending_interrupts - check if there are pending interrupts
404 * only Aliveness, Input ready, and output doorbell are of relevance
406 * @dev: the device structure
408 * Checks if there are pending interrupts
409 * only Aliveness, Readiness, Input ready, and Output doorbell are relevant
411 static bool mei_txe_pending_interrupts(struct mei_device *dev)
414 struct mei_txe_hw *hw = to_txe_hw(dev);
415 bool ret = (hw->intr_cause & (TXE_INTR_READINESS |
421 dev_dbg(&dev->pdev->dev,
422 "Pending Interrupts InReady=%01d Readiness=%01d, Aliveness=%01d, OutDoor=%01d\n",
423 !!(hw->intr_cause & TXE_INTR_IN_READY),
424 !!(hw->intr_cause & TXE_INTR_READINESS),
425 !!(hw->intr_cause & TXE_INTR_ALIVENESS),
426 !!(hw->intr_cause & TXE_INTR_OUT_DB));
432 * mei_txe_input_payload_write - write a dword to the host buffer
435 * @dev: the device structure
436 * @idx: index in the host buffer
439 static void mei_txe_input_payload_write(struct mei_device *dev,
440 unsigned long idx, u32 value)
442 struct mei_txe_hw *hw = to_txe_hw(dev);
443 mei_txe_sec_reg_write(hw, SEC_IPC_INPUT_PAYLOAD_REG +
444 (idx * sizeof(u32)), value);
448 * mei_txe_out_data_read - read dword from the device buffer
451 * @dev: the device structure
452 * @idx: index in the device buffer
454 * returns register value at index
456 static u32 mei_txe_out_data_read(const struct mei_device *dev,
459 struct mei_txe_hw *hw = to_txe_hw(dev);
460 return mei_txe_br_reg_read(hw,
461 BRIDGE_IPC_OUTPUT_PAYLOAD_REG + (idx * sizeof(u32)));
467 * mei_txe_readiness_set_host_rdy
469 * @dev: the device structure
471 static void mei_txe_readiness_set_host_rdy(struct mei_device *dev)
473 struct mei_txe_hw *hw = to_txe_hw(dev);
474 mei_txe_br_reg_write(hw,
475 SICR_HOST_IPC_READINESS_REQ_REG,
476 SICR_HOST_IPC_READINESS_HOST_RDY);
480 * mei_txe_readiness_clear
482 * @dev: the device structure
484 static void mei_txe_readiness_clear(struct mei_device *dev)
486 struct mei_txe_hw *hw = to_txe_hw(dev);
487 mei_txe_br_reg_write(hw, SICR_HOST_IPC_READINESS_REQ_REG,
488 SICR_HOST_IPC_READINESS_RDY_CLR);
491 * mei_txe_readiness_get - Reads and returns
492 * the HICR_SEC_IPC_READINESS register value
494 * @dev: the device structure
496 static u32 mei_txe_readiness_get(struct mei_device *dev)
498 struct mei_txe_hw *hw = to_txe_hw(dev);
499 return mei_txe_br_reg_read(hw, HICR_SEC_IPC_READINESS_REG);
504 * mei_txe_readiness_is_sec_rdy - check readiness
505 * for HICR_SEC_IPC_READINESS_SEC_RDY
507 * @readiness - cached readiness state
509 static inline bool mei_txe_readiness_is_sec_rdy(u32 readiness)
511 return !!(readiness & HICR_SEC_IPC_READINESS_SEC_RDY);
515 * mei_txe_hw_is_ready - check if the hw is ready
517 * @dev: the device structure
519 static bool mei_txe_hw_is_ready(struct mei_device *dev)
521 u32 readiness = mei_txe_readiness_get(dev);
522 return mei_txe_readiness_is_sec_rdy(readiness);
526 * mei_txe_host_is_ready - check if the host is ready
528 * @dev: the device structure
530 static inline bool mei_txe_host_is_ready(struct mei_device *dev)
532 struct mei_txe_hw *hw = to_txe_hw(dev);
533 u32 reg = mei_txe_br_reg_read(hw, HICR_SEC_IPC_READINESS_REG);
534 return !!(reg & HICR_SEC_IPC_READINESS_HOST_RDY);
538 * mei_txe_readiness_wait - wait till readiness settles
540 * @dev: the device structure
542 * returns 0 on success and -ETIME on timeout
544 static int mei_txe_readiness_wait(struct mei_device *dev)
546 if (mei_txe_hw_is_ready(dev))
549 mutex_unlock(&dev->device_lock);
550 wait_event_timeout(dev->wait_hw_ready, dev->recvd_hw_ready,
551 msecs_to_jiffies(SEC_RESET_WAIT_TIMEOUT));
552 mutex_lock(&dev->device_lock);
553 if (!dev->recvd_hw_ready) {
554 dev_err(&dev->pdev->dev, "wait for readiness failed\n");
558 dev->recvd_hw_ready = false;
563 * mei_txe_hw_config - configure hardware at the start of the devices
565 * @dev: the device structure
567 * Configure hardware at the start of the device should be done only
568 * once at the device probe time
570 static void mei_txe_hw_config(struct mei_device *dev)
573 struct mei_txe_hw *hw = to_txe_hw(dev);
574 /* Doesn't change in runtime */
575 dev->hbuf_depth = PAYLOAD_SIZE / 4;
577 hw->aliveness = mei_txe_aliveness_get(dev);
578 hw->readiness = mei_txe_readiness_get(dev);
580 dev_dbg(&dev->pdev->dev, "aliveness_resp = 0x%08x, readiness = 0x%08x.\n",
581 hw->aliveness, hw->readiness);
586 * mei_txe_write - writes a message to device.
588 * @dev: the device structure
589 * @header: header of message
590 * @buf: message buffer will be written
591 * returns 1 if success, 0 - otherwise.
594 static int mei_txe_write(struct mei_device *dev,
595 struct mei_msg_hdr *header, unsigned char *buf)
597 struct mei_txe_hw *hw = to_txe_hw(dev);
599 unsigned long length;
600 int slots = dev->hbuf_depth;
601 u32 *reg_buf = (u32 *)buf;
605 if (WARN_ON(!header || !buf))
608 length = header->length;
610 dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(header));
612 dw_cnt = mei_data2slots(length);
616 if (WARN(!hw->aliveness, "txe write: aliveness not asserted\n"))
619 /* Enable Input Ready Interrupt. */
620 mei_txe_input_ready_interrupt_enable(dev);
622 if (!mei_txe_is_input_ready(dev)) {
623 dev_err(&dev->pdev->dev, "Input is not ready");
627 mei_txe_input_payload_write(dev, 0, *((u32 *)header));
629 for (i = 0; i < length / 4; i++)
630 mei_txe_input_payload_write(dev, i + 1, reg_buf[i]);
635 memcpy(®, &buf[length - rem], rem);
636 mei_txe_input_payload_write(dev, i + 1, reg);
639 /* after each write the whole buffer is consumed */
642 /* Set Input-Doorbell */
643 mei_txe_input_doorbell_set(hw);
649 * mei_txe_hbuf_max_len - mimics the me hbuf circular buffer
651 * @dev: the device structure
653 * returns the PAYLOAD_SIZE - 4
655 static size_t mei_txe_hbuf_max_len(const struct mei_device *dev)
657 return PAYLOAD_SIZE - sizeof(struct mei_msg_hdr);
661 * mei_txe_hbuf_empty_slots - mimics the me hbuf circular buffer
663 * @dev: the device structure
665 * returns always hbuf_depth
667 static int mei_txe_hbuf_empty_slots(struct mei_device *dev)
669 struct mei_txe_hw *hw = to_txe_hw(dev);
674 * mei_txe_count_full_read_slots - mimics the me device circular buffer
676 * @dev: the device structure
678 * returns always buffer size in dwords count
680 static int mei_txe_count_full_read_slots(struct mei_device *dev)
682 /* read buffers has static size */
683 return PAYLOAD_SIZE / 4;
687 * mei_txe_read_hdr - read message header which is always in 4 first bytes
689 * @dev: the device structure
691 * returns mei message header
694 static u32 mei_txe_read_hdr(const struct mei_device *dev)
696 return mei_txe_out_data_read(dev, 0);
699 * mei_txe_read - reads a message from the txe device.
701 * @dev: the device structure
702 * @buf: message buffer will be written
703 * @len: message size will be read
705 * returns -EINVAL on error wrong argument and 0 on success
707 static int mei_txe_read(struct mei_device *dev,
708 unsigned char *buf, unsigned long len)
711 struct mei_txe_hw *hw = to_txe_hw(dev);
713 u32 *reg_buf = (u32 *)buf;
716 if (WARN_ON(!buf || !len))
719 dev_dbg(&dev->pdev->dev,
720 "buffer-length = %lu buf[0]0x%08X\n",
721 len, mei_txe_out_data_read(dev, 0));
723 for (i = 0; i < len / 4; i++) {
724 /* skip header: index starts from 1 */
725 u32 reg = mei_txe_out_data_read(dev, i + 1);
726 dev_dbg(&dev->pdev->dev, "buf[%d] = 0x%08X\n", i, reg);
731 u32 reg = mei_txe_out_data_read(dev, i + 1);
732 memcpy(reg_buf, ®, rem);
735 mei_txe_output_ready_set(hw);
740 * mei_txe_hw_reset - resets host and fw.
742 * @dev: the device structure
743 * @intr_enable: if interrupt should be enabled after reset.
745 * returns 0 on success and < 0 in case of error
747 static int mei_txe_hw_reset(struct mei_device *dev, bool intr_enable)
749 struct mei_txe_hw *hw = to_txe_hw(dev);
753 * read input doorbell to ensure consistency between Bridge and SeC
754 * return value might be garbage return
756 (void)mei_txe_sec_reg_read_silent(hw, SEC_IPC_INPUT_DOORBELL_REG);
758 aliveness_req = mei_txe_aliveness_req_get(dev);
759 hw->aliveness = mei_txe_aliveness_get(dev);
761 /* Disable interrupts in this stage we will poll */
762 mei_txe_intr_disable(dev);
765 * If Aliveness Request and Aliveness Response are not equal then
766 * wait for them to be equal
767 * Since we might have interrupts disabled - poll for it
769 if (aliveness_req != hw->aliveness)
770 if (mei_txe_aliveness_poll(dev, aliveness_req) < 0) {
771 dev_err(&dev->pdev->dev,
772 "wait for aliveness settle failed ... bailing out\n");
777 * If Aliveness Request and Aliveness Response are set then clear them
780 mei_txe_aliveness_set(dev, 0);
781 if (mei_txe_aliveness_poll(dev, 0) < 0) {
782 dev_err(&dev->pdev->dev,
783 "wait for aliveness failed ... bailing out\n");
789 * Set rediness RDY_CLR bit
791 mei_txe_readiness_clear(dev);
797 * mei_txe_hw_start - start the hardware after reset
799 * @dev: the device structure
801 * returns 0 on success and < 0 in case of error
803 static int mei_txe_hw_start(struct mei_device *dev)
805 struct mei_txe_hw *hw = to_txe_hw(dev);
810 /* bring back interrupts */
811 mei_txe_intr_enable(dev);
813 ret = mei_txe_readiness_wait(dev);
815 dev_err(&dev->pdev->dev, "wating for readiness failed\n");
820 * If HISR.INT2_STS interrupt status bit is set then clear it.
822 hisr = mei_txe_br_reg_read(hw, HISR_REG);
823 if (hisr & HISR_INT_2_STS)
824 mei_txe_br_reg_write(hw, HISR_REG, HISR_INT_2_STS);
826 /* Clear the interrupt cause of OutputDoorbell */
827 clear_bit(TXE_INTR_OUT_DB_BIT, &hw->intr_cause);
829 ret = mei_txe_aliveness_set_sync(dev, 1);
831 dev_err(&dev->pdev->dev, "wait for aliveness failed ... bailing out\n");
835 /* enable input ready interrupts:
836 * SEC_IPC_HOST_INT_MASK.IPC_INPUT_READY_INT_MASK
838 mei_txe_input_ready_interrupt_enable(dev);
841 /* Set the SICR_SEC_IPC_OUTPUT_STATUS.IPC_OUTPUT_READY bit */
842 mei_txe_output_ready_set(hw);
844 /* Set bit SICR_HOST_IPC_READINESS.HOST_RDY
846 mei_txe_readiness_set_host_rdy(dev);
852 * mei_txe_check_and_ack_intrs - translate multi BAR interrupt into
853 * single bit mask and acknowledge the interrupts
855 * @dev: the device structure
856 * @do_ack: acknowledge interrupts
858 static bool mei_txe_check_and_ack_intrs(struct mei_device *dev, bool do_ack)
860 struct mei_txe_hw *hw = to_txe_hw(dev);
867 /* read interrupt registers */
868 hhisr = mei_txe_br_reg_read(hw, HHISR_REG);
869 generated = (hhisr & IPC_HHIER_MSK);
873 hisr = mei_txe_br_reg_read(hw, HISR_REG);
875 aliveness = mei_txe_aliveness_get(dev);
876 if (hhisr & IPC_HHIER_SEC && aliveness)
877 ipc_isr = mei_txe_sec_reg_read_silent(hw,
878 SEC_IPC_HOST_INT_STATUS_REG);
882 generated = generated ||
883 (hisr & HISR_INT_STS_MSK) ||
884 (ipc_isr & SEC_IPC_HOST_INT_STATUS_PENDING);
886 if (generated && do_ack) {
887 /* Save the interrupt causes */
888 hw->intr_cause |= hisr & HISR_INT_STS_MSK;
889 if (ipc_isr & SEC_IPC_HOST_INT_STATUS_IN_RDY)
890 hw->intr_cause |= TXE_INTR_IN_READY;
893 mei_txe_intr_disable(dev);
894 /* Clear the interrupts in hierarchy:
895 * IPC and Bridge, than the High Level */
896 mei_txe_sec_reg_write_silent(hw,
897 SEC_IPC_HOST_INT_STATUS_REG, ipc_isr);
898 mei_txe_br_reg_write(hw, HISR_REG, hisr);
899 mei_txe_br_reg_write(hw, HHISR_REG, hhisr);
907 * mei_txe_irq_quick_handler - The ISR of the MEI device
909 * @irq: The irq number
910 * @dev_id: pointer to the device structure
912 * returns irqreturn_t
914 irqreturn_t mei_txe_irq_quick_handler(int irq, void *dev_id)
916 struct mei_device *dev = dev_id;
918 if (mei_txe_check_and_ack_intrs(dev, true))
919 return IRQ_WAKE_THREAD;
925 * mei_txe_irq_thread_handler - txe interrupt thread
927 * @irq: The irq number
928 * @dev_id: pointer to the device structure
930 * returns irqreturn_t
933 irqreturn_t mei_txe_irq_thread_handler(int irq, void *dev_id)
935 struct mei_device *dev = (struct mei_device *) dev_id;
936 struct mei_txe_hw *hw = to_txe_hw(dev);
937 struct mei_cl_cb complete_list;
941 dev_dbg(&dev->pdev->dev, "irq thread: Interrupt Registers HHISR|HISR|SEC=%02X|%04X|%02X\n",
942 mei_txe_br_reg_read(hw, HHISR_REG),
943 mei_txe_br_reg_read(hw, HISR_REG),
944 mei_txe_sec_reg_read_silent(hw, SEC_IPC_HOST_INT_STATUS_REG));
947 /* initialize our complete list */
948 mutex_lock(&dev->device_lock);
949 mei_io_list_init(&complete_list);
951 if (pci_dev_msi_enabled(dev->pdev))
952 mei_txe_check_and_ack_intrs(dev, true);
954 /* show irq events */
955 mei_txe_pending_interrupts(dev);
957 hw->aliveness = mei_txe_aliveness_get(dev);
958 hw->readiness = mei_txe_readiness_get(dev);
961 * Detection of TXE driver going through reset
962 * or TXE driver resetting the HECI interface.
964 if (test_and_clear_bit(TXE_INTR_READINESS_BIT, &hw->intr_cause)) {
965 dev_dbg(&dev->pdev->dev, "Readiness Interrupt was received...\n");
967 /* Check if SeC is going through reset */
968 if (mei_txe_readiness_is_sec_rdy(hw->readiness)) {
969 dev_dbg(&dev->pdev->dev, "we need to start the dev.\n");
970 dev->recvd_hw_ready = true;
972 dev->recvd_hw_ready = false;
973 if (dev->dev_state != MEI_DEV_RESETTING) {
975 dev_warn(&dev->pdev->dev, "FW not ready: resetting.\n");
976 schedule_work(&dev->reset_work);
981 wake_up(&dev->wait_hw_ready);
984 /************************************************************/
985 /* Check interrupt cause:
986 * Aliveness: Detection of SeC acknowledge of host request that
987 * it remain alive or host cancellation of that request.
990 if (test_and_clear_bit(TXE_INTR_ALIVENESS_BIT, &hw->intr_cause)) {
991 /* Clear the interrupt cause */
992 dev_dbg(&dev->pdev->dev,
993 "Aliveness Interrupt: Status: %d\n", hw->aliveness);
994 dev->pg_event = MEI_PG_EVENT_RECEIVED;
995 if (waitqueue_active(&hw->wait_aliveness_resp))
996 wake_up(&hw->wait_aliveness_resp);
1001 * Detection of SeC having sent output to host
1003 slots = mei_count_full_read_slots(dev);
1004 if (test_and_clear_bit(TXE_INTR_OUT_DB_BIT, &hw->intr_cause)) {
1006 rets = mei_irq_read_handler(dev, &complete_list, &slots);
1007 if (rets && dev->dev_state != MEI_DEV_RESETTING) {
1008 dev_err(&dev->pdev->dev,
1009 "mei_irq_read_handler ret = %d.\n", rets);
1011 schedule_work(&dev->reset_work);
1015 /* Input Ready: Detection if host can write to SeC */
1016 if (test_and_clear_bit(TXE_INTR_IN_READY_BIT, &hw->intr_cause)) {
1017 dev->hbuf_is_ready = true;
1018 hw->slots = dev->hbuf_depth;
1021 if (hw->aliveness && dev->hbuf_is_ready) {
1022 /* get the real register value */
1023 dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
1024 rets = mei_irq_write_handler(dev, &complete_list);
1025 if (rets && rets != -EMSGSIZE)
1026 dev_err(&dev->pdev->dev, "mei_irq_write_handler ret = %d.\n",
1028 dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
1031 mei_irq_compl_handler(dev, &complete_list);
1034 dev_dbg(&dev->pdev->dev, "interrupt thread end ret = %d\n", rets);
1036 mutex_unlock(&dev->device_lock);
1038 mei_enable_interrupts(dev);
1042 static const struct mei_hw_ops mei_txe_hw_ops = {
1044 .host_is_ready = mei_txe_host_is_ready,
1046 .pg_state = mei_txe_pg_state,
1048 .hw_is_ready = mei_txe_hw_is_ready,
1049 .hw_reset = mei_txe_hw_reset,
1050 .hw_config = mei_txe_hw_config,
1051 .hw_start = mei_txe_hw_start,
1053 .pg_is_enabled = mei_txe_pg_is_enabled,
1055 .intr_clear = mei_txe_intr_clear,
1056 .intr_enable = mei_txe_intr_enable,
1057 .intr_disable = mei_txe_intr_disable,
1059 .hbuf_free_slots = mei_txe_hbuf_empty_slots,
1060 .hbuf_is_ready = mei_txe_is_input_ready,
1061 .hbuf_max_len = mei_txe_hbuf_max_len,
1063 .write = mei_txe_write,
1065 .rdbuf_full_slots = mei_txe_count_full_read_slots,
1066 .read_hdr = mei_txe_read_hdr,
1068 .read = mei_txe_read,
1073 * mei_txe_dev_init - allocates and initializes txe hardware specific structure
1075 * @pdev - pci device
1076 * returns struct mei_device * on success or NULL;
1079 struct mei_device *mei_txe_dev_init(struct pci_dev *pdev)
1081 struct mei_device *dev;
1082 struct mei_txe_hw *hw;
1084 dev = kzalloc(sizeof(struct mei_device) +
1085 sizeof(struct mei_txe_hw), GFP_KERNEL);
1089 mei_device_init(dev);
1091 hw = to_txe_hw(dev);
1093 init_waitqueue_head(&hw->wait_aliveness_resp);
1095 dev->ops = &mei_txe_hw_ops;
1102 * mei_txe_setup_satt2 - SATT2 configuration for DMA support.
1104 * @dev: the device structure
1105 * @addr: physical address start of the range
1106 * @range: physical range size
1108 int mei_txe_setup_satt2(struct mei_device *dev, phys_addr_t addr, u32 range)
1110 struct mei_txe_hw *hw = to_txe_hw(dev);
1112 u32 lo32 = lower_32_bits(addr);
1113 u32 hi32 = upper_32_bits(addr);
1116 /* SATT is limited to 36 Bits */
1120 /* SATT has to be 16Byte aligned */
1124 /* SATT range has to be 4Bytes aligned */
1128 /* SATT is limited to 32 MB range*/
1129 if (range > SATT_RANGE_MAX)
1132 ctrl = SATT2_CTRL_VALID_MSK;
1133 ctrl |= hi32 << SATT2_CTRL_BR_BASE_ADDR_REG_SHIFT;
1135 mei_txe_br_reg_write(hw, SATT2_SAP_SIZE_REG, range);
1136 mei_txe_br_reg_write(hw, SATT2_BRG_BA_LSB_REG, lo32);
1137 mei_txe_br_reg_write(hw, SATT2_CTRL_REG, ctrl);
1138 dev_dbg(&dev->pdev->dev, "SATT2: SAP_SIZE_OFFSET=0x%08X, BRG_BA_LSB_OFFSET=0x%08X, CTRL_OFFSET=0x%08X\n",