1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (c) 2014-2016, Intel Corporation.
8 #include <linux/devm-helpers.h>
14 #include "hw-ish.h"
22  * ish_reg_read() - Read register
24  * @offset: Register offset
26  * Read 32 bit register at a given offset
31 	unsigned long offset)  in ish_reg_read()  argument
35 	return readl(hw->mem_addr + offset);  in ish_reg_read()
39  * ish_reg_write() - Write register
41  * @offset: Register offset
44  * Writes 32 bit register at a give offset
47 				 unsigned long offset,  in ish_reg_write()  argument
52 	writel(value, hw->mem_addr + offset);  in ish_reg_write()
56  * _ish_read_fw_sts_reg() - Read FW status register
69  * check_generated_interrupt() - Check if ISH interrupt
81 	if (dev->pdev->device == PCI_DEVICE_ID_INTEL_ISH_CHV) {  in check_generated_interrupt()
88 		/* only busy-clear bit is RW, others are RO */  in check_generated_interrupt()
97  * ish_is_input_ready() - Check if FW ready for RX
113  * set_host_ready() - Indicate host ready
120 	if (dev->pdev->device == PCI_DEVICE_ID_INTEL_ISH_CHV) {  in set_host_ready()
121 		if (dev->pdev->revision == REVISION_ID_CHT_A0 ||  in set_host_ready()
122 				(dev->pdev->revision & REVISION_ID_SI_MASK) ==  in set_host_ready()
125 		else if (dev->pdev->revision == REVISION_ID_CHT_B0 ||  in set_host_ready()
126 				(dev->pdev->revision & REVISION_ID_SI_MASK) ==  in set_host_ready()
128 				(dev->pdev->revision & REVISION_ID_SI_MASK) ==  in set_host_ready()
130 				(dev->pdev->revision & REVISION_ID_SI_MASK) ==  in set_host_ready()
154  * ishtp_fw_is_ready() - Check if FW ready
170  * ish_set_host_rdy() - Indicate host ready
184  * ish_clr_host_rdy() - Indicate host not ready
205  * ish_set_host_ready() - reconfig ipc host registers
213  * Return: 0 for success else error fault code
225  * _ishtp_read_hdr() - Read message header
238  * _ishtp_read - Read message
262  * write_ipc_from_queue() - try to write ipc msg from Tx queue to device
265  * Check if DRBL is cleared. if it is - write the first IPC msg,  then call
268  * Return: 0 for success else failure code
283 	if (dev->dev_state == ISHTP_DEV_DISABLED)  in write_ipc_from_queue()
284 		return -EINVAL;  in write_ipc_from_queue()
286 	spin_lock_irqsave(&dev->wr_processing_spinlock, flags);  in write_ipc_from_queue()
288 		spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);  in write_ipc_from_queue()
289 		return -EBUSY;  in write_ipc_from_queue()
293 	 * if tx send list is empty - return 0;  in write_ipc_from_queue()
296 	if (list_empty(&dev->wr_processing_list)) {  in write_ipc_from_queue()
297 		spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);  in write_ipc_from_queue()
301 	ipc_link = list_first_entry(&dev->wr_processing_list,  in write_ipc_from_queue()
304 	length = ipc_link->length - sizeof(uint32_t);  in write_ipc_from_queue()
305 	doorbell_val = *(uint32_t *)ipc_link->inline_data;  in write_ipc_from_queue()
306 	r_buf = (uint32_t *)(ipc_link->inline_data + sizeof(uint32_t));  in write_ipc_from_queue()
346 	++dev->ipc_tx_cnt;  in write_ipc_from_queue()
347 	dev->ipc_tx_bytes_cnt += IPC_HEADER_GET_LENGTH(doorbell_val);  in write_ipc_from_queue()
349 	ipc_send_compl = ipc_link->ipc_send_compl;  in write_ipc_from_queue()
350 	ipc_send_compl_prm = ipc_link->ipc_send_compl_prm;  in write_ipc_from_queue()
351 	list_del_init(&ipc_link->link);  in write_ipc_from_queue()
352 	list_add(&ipc_link->link, &dev->wr_free_list);  in write_ipc_from_queue()
353 	spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);  in write_ipc_from_queue()
366  * write_ipc_to_queue() - write ipc msg to Tx queue
374  *  Tx-to-write list then try to send the first IPC waiting msg
379  * Return: 0 for success else failure code
389 		return -EMSGSIZE;  in write_ipc_to_queue()
391 	spin_lock_irqsave(&dev->wr_processing_spinlock, flags);  in write_ipc_to_queue()
392 	if (list_empty(&dev->wr_free_list)) {  in write_ipc_to_queue()
393 		spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);  in write_ipc_to_queue()
394 		return -ENOMEM;  in write_ipc_to_queue()
396 	ipc_link = list_first_entry(&dev->wr_free_list,  in write_ipc_to_queue()
398 	list_del_init(&ipc_link->link);  in write_ipc_to_queue()
400 	ipc_link->ipc_send_compl = ipc_send_compl;  in write_ipc_to_queue()
401 	ipc_link->ipc_send_compl_prm = ipc_send_compl_prm;  in write_ipc_to_queue()
402 	ipc_link->length = length;  in write_ipc_to_queue()
403 	memcpy(ipc_link->inline_data, msg, length);  in write_ipc_to_queue()
405 	list_add_tail(&ipc_link->link, &dev->wr_processing_list);  in write_ipc_to_queue()
406 	spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);  in write_ipc_to_queue()
414  * ipc_send_mng_msg() - Send management message
416  * @msg_code: Message code
422  * Return: 0 for success else failure code
440  * timed_wait_for_timeout() - wait special event with timeout
449  * Return: 0 for success else failure code
463 			ret = -EINVAL;  in timed_wait_for_timeout()
471 			timeout -= (timeinc - left_time);  in timed_wait_for_timeout()
478 		ret = -EBUSY;  in timed_wait_for_timeout()
490  * ish_fw_reset_handler() - FW reset handler
495  * Return: 0 for success else failure code
506 	spin_lock_irqsave(&dev->wr_processing_spinlock, flags);  in ish_fw_reset_handler()
507 	list_splice_init(&dev->wr_processing_list, &dev->wr_free_list);  in ish_fw_reset_handler()
508 	spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);  in ish_fw_reset_handler()
519 		return	-EPIPE;  in ish_fw_reset_handler()
522 	ishtp_dev->prev_sync = 0;  in ish_fw_reset_handler()
526 	 * RESET_NOTIFY_ACK - FW will be checking for it  in ish_fw_reset_handler()
541 		dev_err(dev->devc,  in ish_fw_reset_handler()
542 			"[ishtp-ish]: completed reset, ISH is dead (FWSTS = %08X)\n",  in ish_fw_reset_handler()
544 		return -ENODEV;  in ish_fw_reset_handler()
552  * fw_reset_work_fn() - FW reset worker function
563 		/* ISH is ILUP & ISHTP-ready. Restart ISHTP */  in fw_reset_work_fn()
565 		ishtp_dev->recvd_hw_ready = 1;  in fw_reset_work_fn()
566 		wake_up_interruptible(&ishtp_dev->wait_hw_ready);  in fw_reset_work_fn()
572 		dev_err(ishtp_dev->devc, "[ishtp-ish]: FW reset failed (%d)\n",  in fw_reset_work_fn()
577  * _ish_sync_fw_clock() -Sync FW clock with the OS clock
580  * Sync FW and OS time
586 	if (dev->prev_sync && time_before(jiffies, dev->prev_sync + 20 * HZ))  in _ish_sync_fw_clock()
589 	dev->prev_sync = jiffies;  in _ish_sync_fw_clock()
595  * recv_ipc() - Receive and process IPC management messages
614 		if (dev->suspend_flag) {  in recv_ipc()
615 			dev->suspend_flag = 0;  in recv_ipc()
616 			wake_up_interruptible(&dev->suspend_wait);  in recv_ipc()
618 		if (dev->resume_flag) {  in recv_ipc()
619 			dev->resume_flag = 0;  in recv_ipc()
620 			wake_up_interruptible(&dev->resume_wait);  in recv_ipc()
634 		dev->recvd_hw_ready = 1;  in recv_ipc()
635 		wake_up_interruptible(&dev->wait_hw_ready);  in recv_ipc()
641  * ish_irq_handler() - ISH IRQ handler
664 	if (dev->dev_state == ISHTP_DEV_DISABLED)  in ish_irq_handler()
669 		dev_err(dev->devc,  in ish_irq_handler()
670 			"IPC hdr - bad length: %u; dropped\n",  in ish_irq_handler()
688 	++dev->ipc_rx_cnt;  in ish_irq_handler()
689 	dev->ipc_rx_bytes_cnt += IPC_HEADER_GET_LENGTH(doorbell_val);  in ish_irq_handler()
699  * ish_disable_dma() - disable dma communication between host and ISHFW
704  * Return: 0 for success else error code.
720 		dev_err(dev->devc,  in ish_disable_dma()
722 		return	-EBUSY;  in ish_disable_dma()
729  * ish_wakeup() - wakeup ishfw from waiting-for-host state
733  * it wil wakeup FW from waiting-for-host state.
751  * _ish_hw_reset() - HW reset
756  * Return: 0 for success else error fault code
760 	struct pci_dev *pdev = dev->pdev;  in _ish_hw_reset()
765 		return	-ENODEV;  in _ish_hw_reset()
769 		dev->dev_state = ISHTP_DEV_RESETTING;  in _ish_hw_reset()
771 	if (!pdev->pm_cap) {  in _ish_hw_reset()
772 		dev_err(&pdev->dev, "Can't reset - no PM caps\n");  in _ish_hw_reset()
773 		return	-EINVAL;  in _ish_hw_reset()
778 		dev_err(&pdev->dev,  in _ish_hw_reset()
779 			"Can't reset - stuck with DMA in-progress\n");  in _ish_hw_reset()
780 		return	-EBUSY;  in _ish_hw_reset()
783 	pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &csr);  in _ish_hw_reset()
787 	pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, csr);  in _ish_hw_reset()
789 	mdelay(pdev->d3hot_delay);  in _ish_hw_reset()
793 	pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, csr);  in _ish_hw_reset()
802  * _ish_ipc_reset() - IPC reset
807  * Return: 0 for success else error fault code
824 	dev->recvd_hw_ready = 0;  in _ish_ipc_reset()
830 		dev_err(dev->devc, "Failed to send IPC MNG_RESET_NOTIFY\n");  in _ish_ipc_reset()
834 	wait_event_interruptible_timeout(dev->wait_hw_ready,  in _ish_ipc_reset()
835 					 dev->recvd_hw_ready, 2 * HZ);  in _ish_ipc_reset()
836 	if (!dev->recvd_hw_ready) {  in _ish_ipc_reset()
837 		dev_err(dev->devc, "Timed out waiting for HW ready\n");  in _ish_ipc_reset()
838 		rv = -ENODEV;  in _ish_ipc_reset()
845  * ish_hw_start() -Start ISH HW
850  * Return: 0 for success else error fault code
861 	/* wait for FW-initiated reset flow */  in ish_hw_start()
862 	if (!dev->recvd_hw_ready)  in ish_hw_start()
863 		wait_event_interruptible_timeout(dev->wait_hw_ready,  in ish_hw_start()
864 						 dev->recvd_hw_ready,  in ish_hw_start()
867 	if (!dev->recvd_hw_ready) {  in ish_hw_start()
868 		dev_err(dev->devc,  in ish_hw_start()
869 			"[ishtp-ish]: Timed out waiting for FW-initiated reset\n");  in ish_hw_start()
870 		return	-ENODEV;  in ish_hw_start()
877  * ish_ipc_get_header() -Get doorbell value
911  * Return: false - has cache snooping capability
912  *         true - no cache snooping, need manually cache flush
916 	return (dev->pdev->device == PCI_DEVICE_ID_INTEL_ISH_EHL_Ax ||  in _dma_no_cache_snooping()
917 		dev->pdev->device == PCI_DEVICE_ID_INTEL_ISH_TGL_LP ||  in _dma_no_cache_snooping()
918 		dev->pdev->device == PCI_DEVICE_ID_INTEL_ISH_TGL_H ||  in _dma_no_cache_snooping()
919 		dev->pdev->device == PCI_DEVICE_ID_INTEL_ISH_ADL_S ||  in _dma_no_cache_snooping()
920 		dev->pdev->device == PCI_DEVICE_ID_INTEL_ISH_ADL_P);  in _dma_no_cache_snooping()
936  * ish_dev_init() -Initialize ISH devoce
949 	dev = devm_kzalloc(&pdev->dev,  in ish_dev_init()
955 	dev->devc = &pdev->dev;  in ish_dev_init()
958 	init_waitqueue_head(&dev->wait_hw_ready);  in ish_dev_init()
960 	spin_lock_init(&dev->wr_processing_spinlock);  in ish_dev_init()
963 	INIT_LIST_HEAD(&dev->wr_processing_list);  in ish_dev_init()
964 	INIT_LIST_HEAD(&dev->wr_free_list);  in ish_dev_init()
968 		tx_buf = devm_kzalloc(&pdev->dev,  in ish_dev_init()
974 			 * at all - although this shouldn't happen  in ish_dev_init()
976 			dev_err(dev->devc,  in ish_dev_init()
977 				"[ishtp-ish]: failure in Tx FIFO allocations (%d)\n",  in ish_dev_init()
981 		list_add_tail(&tx_buf->link, &dev->wr_free_list);  in ish_dev_init()
984 	ret = devm_work_autocancel(&pdev->dev, &fw_reset_work, fw_reset_work_fn);  in ish_dev_init()
986 		dev_err(dev->devc, "Failed to initialise FW reset work\n");  in ish_dev_init()
990 	dev->ops = &ish_hw_ops;  in ish_dev_init()
991 	dev->mtu = IPC_PAYLOAD_SIZE - sizeof(struct ishtp_msg_hdr);  in ish_dev_init()
996  * ish_device_disable() - Disable ISH device
1003 	struct pci_dev *pdev = dev->pdev;  in ish_device_disable()
1010 		dev_err(&pdev->dev,  in ish_device_disable()
1011 			"Can't reset - stuck with DMA in-progress\n");  in ish_device_disable()
1018 	dev->dev_state = ISHTP_DEV_DISABLED;  in ish_device_disable()