sound/soc/sof/core.c - linux - Git at Google

 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
 //
 // This file is provided under a dual BSD/GPLv2 license.  When using or
 // redistributing this file, you may do so under either license.
 //
 // Copyright(c) 2018 Intel Corporation. All rights reserved.
 //
 // Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
 //

 #include <linux/firmware.h>
 #include <linux/module.h>
 #include <sound/soc.h>
 #include <sound/sof.h>
 #include "sof-priv.h"
 #include "ops.h"

 /* see SOF_DBG_ flags */
 static int sof_core_debug =  IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_FIRMWARE_TRACE);
 module_param_named(sof_debug, sof_core_debug, int, 0444);
 MODULE_PARM_DESC(sof_debug, "SOF core debug options (0x0 all off)");

 /* SOF defaults if not provided by the platform in ms */
 #define TIMEOUT_DEFAULT_IPC_MS  500
 #define TIMEOUT_DEFAULT_BOOT_MS 2000

 /**
  * sof_debug_check_flag - check if a given flag(s) is set in sof_core_debug
  * @mask: Flag or combination of flags to check
  *
  * Returns true if all bits set in mask is also set in sof_core_debug, otherwise
  * false
  */
 bool sof_debug_check_flag(int mask)
 {
 	if ((sof_core_debug & mask) == mask)
 		return true;

 	return false;
 }
 EXPORT_SYMBOL(sof_debug_check_flag);

 /*
  * FW Panic/fault handling.
  */

 struct sof_panic_msg {
 	u32 id;
 	const char *msg;
 };

 /* standard FW panic types */
 static const struct sof_panic_msg panic_msg[] = {
 	{SOF_IPC_PANIC_MEM, "out of memory"},
 	{SOF_IPC_PANIC_WORK, "work subsystem init failed"},
 	{SOF_IPC_PANIC_IPC, "IPC subsystem init failed"},
 	{SOF_IPC_PANIC_ARCH, "arch init failed"},
 	{SOF_IPC_PANIC_PLATFORM, "platform init failed"},
 	{SOF_IPC_PANIC_TASK, "scheduler init failed"},
 	{SOF_IPC_PANIC_EXCEPTION, "runtime exception"},
 	{SOF_IPC_PANIC_DEADLOCK, "deadlock"},
 	{SOF_IPC_PANIC_STACK, "stack overflow"},
 	{SOF_IPC_PANIC_IDLE, "can't enter idle"},
 	{SOF_IPC_PANIC_WFI, "invalid wait state"},
 	{SOF_IPC_PANIC_ASSERT, "assertion failed"},
 };

 /**
  * sof_print_oops_and_stack - Handle the printing of DSP oops and stack trace
  * @sdev: Pointer to the device's sdev
  * @level: prink log level to use for the printing
  * @panic_code: the panic code
  * @tracep_code: tracepoint code
  * @oops: Pointer to DSP specific oops data
  * @panic_info: Pointer to the received panic information message
  * @stack: Pointer to the call stack data
  * @stack_words: Number of words in the stack data
  *
  * helper to be called from .dbg_dump callbacks. No error code is
  * provided, it's left as an exercise for the caller of .dbg_dump
  * (typically IPC or loader)
  */
 void sof_print_oops_and_stack(struct snd_sof_dev *sdev, const char *level,
 			      u32 panic_code, u32 tracep_code, void *oops,
 			      struct sof_ipc_panic_info *panic_info,
 			      void *stack, size_t stack_words)
 {
 	u32 code;
 	int i;

 	/* is firmware dead ? */
 	if ((panic_code & SOF_IPC_PANIC_MAGIC_MASK) != SOF_IPC_PANIC_MAGIC) {
 		dev_printk(level, sdev->dev, "unexpected fault %#010x trace %#010x\n",
 			   panic_code, tracep_code);
 		return; /* no fault ? */
 	}

 	code = panic_code & (SOF_IPC_PANIC_MAGIC_MASK | SOF_IPC_PANIC_CODE_MASK);

 	for (i = 0; i < ARRAY_SIZE(panic_msg); i++) {
 		if (panic_msg[i].id == code) {
 			dev_printk(level, sdev->dev, "reason: %s (%#x)\n",
 				   panic_msg[i].msg, code & SOF_IPC_PANIC_CODE_MASK);
 			dev_printk(level, sdev->dev, "trace point: %#010x\n", tracep_code);
 			goto out;
 		}
 	}

 	/* unknown error */
 	dev_printk(level, sdev->dev, "unknown panic code: %#x\n",
 		   code & SOF_IPC_PANIC_CODE_MASK);
 	dev_printk(level, sdev->dev, "trace point: %#010x\n", tracep_code);

 out:
 	dev_printk(level, sdev->dev, "panic at %s:%d\n", panic_info->filename,
 		   panic_info->linenum);
 	sof_oops(sdev, level, oops);
 	sof_stack(sdev, level, oops, stack, stack_words);
 }
 EXPORT_SYMBOL(sof_print_oops_and_stack);

 /* Helper to manage DSP state */
 void sof_set_fw_state(struct snd_sof_dev *sdev, enum sof_fw_state new_state)
 {
 	if (sdev->fw_state == new_state)
 		return;

 	dev_dbg(sdev->dev, "fw_state change: %d -> %d\n", sdev->fw_state, new_state);
 	sdev->fw_state = new_state;

 	switch (new_state) {
 	case SOF_FW_BOOT_NOT_STARTED:
 	case SOF_FW_BOOT_COMPLETE:
 	case SOF_FW_CRASHED:
 		sof_client_fw_state_dispatcher(sdev);
 		fallthrough;
 	default:
 		break;
 	}
 }
 EXPORT_SYMBOL(sof_set_fw_state);

 /*
  *			FW Boot State Transition Diagram
  *
  *    +----------------------------------------------------------------------+
  *    |									     |
  * ------------------	     ------------------				     |
  * |		    |	     |		      |				     |
  * |   BOOT_FAILED  |<-------|  READY_FAILED  |				     |
  * |		    |<--+    |	              |	   ------------------	     |
  * ------------------	|    ------------------	   |		    |	     |
  *	^		|	    ^		   |	CRASHED	    |---+    |
  *	|		|	    |		   |		    |	|    |
  * (FW Boot Timeout)	|	(FW_READY FAIL)	   ------------------	|    |
  *	|		|	    |		     ^			|    |
  *	|		|	    |		     |(DSP Panic)	|    |
  * ------------------	|	    |		   ------------------	|    |
  * |		    |	|	    |		   |		    |	|    |
  * |   IN_PROGRESS  |---------------+------------->|    COMPLETE    |	|    |
  * |		    | (FW Boot OK)   (FW_READY OK) |		    |	|    |
  * ------------------	|			   ------------------	|    |
  *	^		|				|		|    |
  *	|		|				|		|    |
  * (FW Loading OK)	|			(System Suspend/Runtime Suspend)
  *	|		|				|		|    |
  *	|	(FW Loading Fail)			|		|    |
  * ------------------	|	------------------	|		|    |
  * |		    |	|	|		 |<-----+		|    |
  * |   PREPARE	    |---+	|   NOT_STARTED  |<---------------------+    |
  * |		    |		|		 |<--------------------------+
  * ------------------		------------------
  *    |	    ^			    |	   ^
  *    |	    |			    |	   |
  *    |	    +-----------------------+	   |
  *    |		(DSP Probe OK)		   |
  *    |					   |
  *    |					   |
  *    +------------------------------------+
  *	(System Suspend/Runtime Suspend)
  */

 static int sof_probe_continue(struct snd_sof_dev *sdev)
 {
 	struct snd_sof_pdata *plat_data = sdev->pdata;
 	int ret;

 	/* probe the DSP hardware */
 	ret = snd_sof_probe(sdev);
 	if (ret < 0) {
 		dev_err(sdev->dev, "error: failed to probe DSP %d\n", ret);
 		return ret;
 	}

 	sof_set_fw_state(sdev, SOF_FW_BOOT_PREPARE);

 	/* check machine info */
 	ret = sof_machine_check(sdev);
 	if (ret < 0) {
 		dev_err(sdev->dev, "error: failed to get machine info %d\n",
 			ret);
 		goto dsp_err;
 	}

 	/* set up platform component driver */
 	snd_sof_new_platform_drv(sdev);

 	/* register any debug/trace capabilities */
 	ret = snd_sof_dbg_init(sdev);
 	if (ret < 0) {
 		/*
 		 * debugfs issues are suppressed in snd_sof_dbg_init() since
 		 * we cannot rely on debugfs
 		 * here we trap errors due to memory allocation only.
 		 */
 		dev_err(sdev->dev, "error: failed to init DSP trace/debug %d\n",
 			ret);
 		goto dbg_err;
 	}

 	/* init the IPC */
 	sdev->ipc = snd_sof_ipc_init(sdev);
 	if (!sdev->ipc) {
 		ret = -ENOMEM;
 		dev_err(sdev->dev, "error: failed to init DSP IPC %d\n", ret);
 		goto ipc_err;
 	}

 	/* load the firmware */
 	ret = snd_sof_load_firmware(sdev);
 	if (ret < 0) {
 		dev_err(sdev->dev, "error: failed to load DSP firmware %d\n",
 			ret);
 		sof_set_fw_state(sdev, SOF_FW_BOOT_FAILED);
 		goto fw_load_err;
 	}

 	sof_set_fw_state(sdev, SOF_FW_BOOT_IN_PROGRESS);

 	/*
 	 * Boot the firmware. The FW boot status will be modified
 	 * in snd_sof_run_firmware() depending on the outcome.
 	 */
 	ret = snd_sof_run_firmware(sdev);
 	if (ret < 0) {
 		dev_err(sdev->dev, "error: failed to boot DSP firmware %d\n",
 			ret);
 		sof_set_fw_state(sdev, SOF_FW_BOOT_FAILED);
 		goto fw_run_err;
 	}

 	if (sof_debug_check_flag(SOF_DBG_ENABLE_TRACE)) {
 		sdev->fw_trace_is_supported = true;

 		/* init firmware tracing */
 		ret = sof_fw_trace_init(sdev);
 		if (ret < 0) {
 			/* non fatal */
 			dev_warn(sdev->dev, "failed to initialize firmware tracing %d\n",
 				 ret);
 		}
 	} else {
 		dev_dbg(sdev->dev, "SOF firmware trace disabled\n");
 	}

 	/* hereafter all FW boot flows are for PM reasons */
 	sdev->first_boot = false;

 	/* now register audio DSP platform driver and dai */
 	ret = devm_snd_soc_register_component(sdev->dev, &sdev->plat_drv,
 					      sof_ops(sdev)->drv,
 					      sof_ops(sdev)->num_drv);
 	if (ret < 0) {
 		dev_err(sdev->dev,
 			"error: failed to register DSP DAI driver %d\n", ret);
 		goto fw_trace_err;
 	}

 	ret = snd_sof_machine_register(sdev, plat_data);
 	if (ret < 0) {
 		dev_err(sdev->dev,
 			"error: failed to register machine driver %d\n", ret);
 		goto fw_trace_err;
 	}

 	ret = sof_register_clients(sdev);
 	if (ret < 0) {
 		dev_err(sdev->dev, "failed to register clients %d\n", ret);
 		goto sof_machine_err;
 	}

 	/*
 	 * Some platforms in SOF, ex: BYT, may not have their platform PM
 	 * callbacks set. Increment the usage count so as to
 	 * prevent the device from entering runtime suspend.
 	 */
 	if (!sof_ops(sdev)->runtime_suspend || !sof_ops(sdev)->runtime_resume)
 		pm_runtime_get_noresume(sdev->dev);

 	if (plat_data->sof_probe_complete)
 		plat_data->sof_probe_complete(sdev->dev);

 	sdev->probe_completed = true;

 	return 0;

 sof_machine_err:
 	snd_sof_machine_unregister(sdev, plat_data);
 fw_trace_err:
 	sof_fw_trace_free(sdev);
 fw_run_err:
 	snd_sof_fw_unload(sdev);
 fw_load_err:
 	snd_sof_ipc_free(sdev);
 ipc_err:
 dbg_err:
 	snd_sof_free_debug(sdev);
 dsp_err:
 	snd_sof_remove(sdev);

 	/* all resources freed, update state to match */
 	sof_set_fw_state(sdev, SOF_FW_BOOT_NOT_STARTED);
 	sdev->first_boot = true;

 	return ret;
 }

 static void sof_probe_work(struct work_struct *work)
 {
 	struct snd_sof_dev *sdev =
 		container_of(work, struct snd_sof_dev, probe_work);
 	int ret;

 	ret = sof_probe_continue(sdev);
 	if (ret < 0) {
 		/* errors cannot be propagated, log */
 		dev_err(sdev->dev, "error: %s failed err: %d\n", __func__, ret);
 	}
 }

 int snd_sof_device_probe(struct device *dev, struct snd_sof_pdata *plat_data)
 {
 	struct snd_sof_dev *sdev;
 	int ret;

 	sdev = devm_kzalloc(dev, sizeof(*sdev), GFP_KERNEL);
 	if (!sdev)
 		return -ENOMEM;

 	/* initialize sof device */
 	sdev->dev = dev;

 	/* initialize default DSP power state */
 	sdev->dsp_power_state.state = SOF_DSP_PM_D0;

 	sdev->pdata = plat_data;
 	sdev->first_boot = true;
 	dev_set_drvdata(dev, sdev);

 	/* check IPC support */
 	if (!(BIT(plat_data->ipc_type) & plat_data->desc->ipc_supported_mask)) {
 		dev_err(dev, "ipc_type %d is not supported on this platform, mask is %#x\n",
 			plat_data->ipc_type, plat_data->desc->ipc_supported_mask);
 		return -EINVAL;
 	}

 	/* init ops, if necessary */
 	ret = sof_ops_init(sdev);
 	if (ret < 0)
 		return ret;

 	/* check all mandatory ops */
 	if (!sof_ops(sdev) || !sof_ops(sdev)->probe || !sof_ops(sdev)->run ||
 	    !sof_ops(sdev)->block_read || !sof_ops(sdev)->block_write ||
 	    !sof_ops(sdev)->send_msg || !sof_ops(sdev)->load_firmware ||
 	    !sof_ops(sdev)->ipc_msg_data) {
 		dev_err(dev, "error: missing mandatory ops\n");
 		return -EINVAL;
 	}

 	INIT_LIST_HEAD(&sdev->pcm_list);
 	INIT_LIST_HEAD(&sdev->kcontrol_list);
 	INIT_LIST_HEAD(&sdev->widget_list);
 	INIT_LIST_HEAD(&sdev->dai_list);
 	INIT_LIST_HEAD(&sdev->dai_link_list);
 	INIT_LIST_HEAD(&sdev->route_list);
 	INIT_LIST_HEAD(&sdev->ipc_client_list);
 	INIT_LIST_HEAD(&sdev->ipc_rx_handler_list);
 	INIT_LIST_HEAD(&sdev->fw_state_handler_list);
 	spin_lock_init(&sdev->ipc_lock);
 	spin_lock_init(&sdev->hw_lock);
 	mutex_init(&sdev->power_state_access);
 	mutex_init(&sdev->ipc_client_mutex);
 	mutex_init(&sdev->client_event_handler_mutex);

 	/* set default timeouts if none provided */
 	if (plat_data->desc->ipc_timeout == 0)
 		sdev->ipc_timeout = TIMEOUT_DEFAULT_IPC_MS;
 	else
 		sdev->ipc_timeout = plat_data->desc->ipc_timeout;
 	if (plat_data->desc->boot_timeout == 0)
 		sdev->boot_timeout = TIMEOUT_DEFAULT_BOOT_MS;
 	else
 		sdev->boot_timeout = plat_data->desc->boot_timeout;

 	sof_set_fw_state(sdev, SOF_FW_BOOT_NOT_STARTED);

 	if (IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE)) {
 		INIT_WORK(&sdev->probe_work, sof_probe_work);
 		schedule_work(&sdev->probe_work);
 		return 0;
 	}

 	return sof_probe_continue(sdev);
 }
 EXPORT_SYMBOL(snd_sof_device_probe);

 bool snd_sof_device_probe_completed(struct device *dev)
 {
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);

 	return sdev->probe_completed;
 }
 EXPORT_SYMBOL(snd_sof_device_probe_completed);

 int snd_sof_device_remove(struct device *dev)
 {
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
 	struct snd_sof_pdata *pdata = sdev->pdata;
 	int ret;

 	if (IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE))
 		cancel_work_sync(&sdev->probe_work);

 	/*
 	 * Unregister any registered client device first before IPC and debugfs
 	 * to allow client drivers to be removed cleanly
 	 */
 	sof_unregister_clients(sdev);

 	/*
 	 * Unregister machine driver. This will unbind the snd_card which
 	 * will remove the component driver and unload the topology
 	 * before freeing the snd_card.
 	 */
 	snd_sof_machine_unregister(sdev, pdata);

 	if (sdev->fw_state > SOF_FW_BOOT_NOT_STARTED) {
 		sof_fw_trace_free(sdev);
 		ret = snd_sof_dsp_power_down_notify(sdev);
 		if (ret < 0)
 			dev_warn(dev, "error: %d failed to prepare DSP for device removal",
 				 ret);

 		snd_sof_ipc_free(sdev);
 		snd_sof_free_debug(sdev);
 		snd_sof_remove(sdev);
 	}

 	/* release firmware */
 	snd_sof_fw_unload(sdev);

 	return 0;
 }
 EXPORT_SYMBOL(snd_sof_device_remove);

 int snd_sof_device_shutdown(struct device *dev)
 {
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
 	struct snd_sof_pdata *pdata = sdev->pdata;

 	if (IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE))
 		cancel_work_sync(&sdev->probe_work);

 	/*
 	 * make sure clients and machine driver(s) are unregistered to force
 	 * all userspace devices to be closed prior to the DSP shutdown sequence
 	 */
 	sof_unregister_clients(sdev);

 	snd_sof_machine_unregister(sdev, pdata);

 	if (sdev->fw_state == SOF_FW_BOOT_COMPLETE)
 		return snd_sof_shutdown(sdev);

 	return 0;
 }
 EXPORT_SYMBOL(snd_sof_device_shutdown);

 MODULE_AUTHOR("Liam Girdwood");
 MODULE_DESCRIPTION("Sound Open Firmware (SOF) Core");
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_ALIAS("platform:sof-audio");
 MODULE_IMPORT_NS(SND_SOC_SOF_CLIENT);
	// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
	//
	// This file is provided under a dual BSD/GPLv2 license. When using or
	// redistributing this file, you may do so under either license.
	//
	// Copyright(c) 2018 Intel Corporation. All rights reserved.
	//
	// Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
	//

	#include <linux/firmware.h>
	#include <linux/module.h>
	#include <sound/soc.h>
	#include <sound/sof.h>
	#include "sof-priv.h"
	#include "ops.h"

	/* see SOF_DBG_ flags */
	static int sof_core_debug = IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_FIRMWARE_TRACE);
	module_param_named(sof_debug, sof_core_debug, int, 0444);
	MODULE_PARM_DESC(sof_debug, "SOF core debug options (0x0 all off)");

	/* SOF defaults if not provided by the platform in ms */
	#define TIMEOUT_DEFAULT_IPC_MS 500
	#define TIMEOUT_DEFAULT_BOOT_MS 2000

	/**
	* sof_debug_check_flag - check if a given flag(s) is set in sof_core_debug
	* @mask: Flag or combination of flags to check
	*
	* Returns true if all bits set in mask is also set in sof_core_debug, otherwise
	* false
	*/
	bool sof_debug_check_flag(int mask)
	{
	if ((sof_core_debug & mask) == mask)
	return true;

	return false;
	}
	EXPORT_SYMBOL(sof_debug_check_flag);

	/*
	* FW Panic/fault handling.
	*/

	struct sof_panic_msg {
	u32 id;
	const char *msg;
	};

	/* standard FW panic types */
	static const struct sof_panic_msg panic_msg[] = {
	{SOF_IPC_PANIC_MEM, "out of memory"},
	{SOF_IPC_PANIC_WORK, "work subsystem init failed"},
	{SOF_IPC_PANIC_IPC, "IPC subsystem init failed"},
	{SOF_IPC_PANIC_ARCH, "arch init failed"},
	{SOF_IPC_PANIC_PLATFORM, "platform init failed"},
	{SOF_IPC_PANIC_TASK, "scheduler init failed"},
	{SOF_IPC_PANIC_EXCEPTION, "runtime exception"},
	{SOF_IPC_PANIC_DEADLOCK, "deadlock"},
	{SOF_IPC_PANIC_STACK, "stack overflow"},
	{SOF_IPC_PANIC_IDLE, "can't enter idle"},
	{SOF_IPC_PANIC_WFI, "invalid wait state"},
	{SOF_IPC_PANIC_ASSERT, "assertion failed"},
	};

	/**
	* sof_print_oops_and_stack - Handle the printing of DSP oops and stack trace
	* @sdev: Pointer to the device's sdev
	* @level: prink log level to use for the printing
	* @panic_code: the panic code
	* @tracep_code: tracepoint code
	* @oops: Pointer to DSP specific oops data
	* @panic_info: Pointer to the received panic information message
	* @stack: Pointer to the call stack data
	* @stack_words: Number of words in the stack data
	*
	* helper to be called from .dbg_dump callbacks. No error code is
	* provided, it's left as an exercise for the caller of .dbg_dump
	* (typically IPC or loader)
	*/
	void sof_print_oops_and_stack(struct snd_sof_dev sdev, const char level,
	u32 panic_code, u32 tracep_code, void *oops,
	struct sof_ipc_panic_info *panic_info,
	void *stack, size_t stack_words)
	{
	u32 code;
	int i;

	/* is firmware dead ? */
	if ((panic_code & SOF_IPC_PANIC_MAGIC_MASK) != SOF_IPC_PANIC_MAGIC) {
	dev_printk(level, sdev->dev, "unexpected fault %#010x trace %#010x\n",
	panic_code, tracep_code);
	return; /* no fault ? */
	}

	code = panic_code & (SOF_IPC_PANIC_MAGIC_MASK \| SOF_IPC_PANIC_CODE_MASK);

	for (i = 0; i < ARRAY_SIZE(panic_msg); i++) {
	if (panic_msg[i].id == code) {
	dev_printk(level, sdev->dev, "reason: %s (%#x)\n",
	panic_msg[i].msg, code & SOF_IPC_PANIC_CODE_MASK);
	dev_printk(level, sdev->dev, "trace point: %#010x\n", tracep_code);
	goto out;
	}
	}

	/* unknown error */
	dev_printk(level, sdev->dev, "unknown panic code: %#x\n",
	code & SOF_IPC_PANIC_CODE_MASK);
	dev_printk(level, sdev->dev, "trace point: %#010x\n", tracep_code);

	out:
	dev_printk(level, sdev->dev, "panic at %s:%d\n", panic_info->filename,
	panic_info->linenum);
	sof_oops(sdev, level, oops);
	sof_stack(sdev, level, oops, stack, stack_words);
	}
	EXPORT_SYMBOL(sof_print_oops_and_stack);

	/* Helper to manage DSP state */
	void sof_set_fw_state(struct snd_sof_dev *sdev, enum sof_fw_state new_state)
	{
	if (sdev->fw_state == new_state)
	return;

	dev_dbg(sdev->dev, "fw_state change: %d -> %d\n", sdev->fw_state, new_state);
	sdev->fw_state = new_state;

	switch (new_state) {
	case SOF_FW_BOOT_NOT_STARTED:
	case SOF_FW_BOOT_COMPLETE:
	case SOF_FW_CRASHED:
	sof_client_fw_state_dispatcher(sdev);
	fallthrough;
	default:
	break;
	}
	}
	EXPORT_SYMBOL(sof_set_fw_state);

	/*
	* FW Boot State Transition Diagram
	*
	* +----------------------------------------------------------------------+
	* \| \|
	* ------------------ ------------------ \|
	* \| \| \| \| \|
	* \| BOOT_FAILED \|<-------\| READY_FAILED \| \|
	* \| \|<--+ \| \| ------------------ \|
	* ------------------ \| ------------------ \| \| \|
	* ^ \| ^ \| CRASHED \|---+ \|
	* \| \| \| \| \| \| \|
	* (FW Boot Timeout) \| (FW_READY FAIL) ------------------ \| \|
	* \| \| \| ^ \| \|
	* \| \| \| \|(DSP Panic) \| \|
	* ------------------ \| \| ------------------ \| \|
	* \| \| \| \| \| \| \| \|
	* \| IN_PROGRESS \|---------------+------------->\| COMPLETE \| \| \|
	* \| \| (FW Boot OK) (FW_READY OK) \| \| \| \|
	* ------------------ \| ------------------ \| \|
	* ^ \| \| \| \|
	* \| \| \| \| \|
	* (FW Loading OK) \| (System Suspend/Runtime Suspend)
	* \| \| \| \| \|
	* \| (FW Loading Fail) \| \| \|
	* ------------------ \| ------------------ \| \| \|
	* \| \| \| \| \|<-----+ \| \|
	* \| PREPARE \|---+ \| NOT_STARTED \|<---------------------+ \|
	* \| \| \| \|<--------------------------+
	* ------------------ ------------------
	* \| ^ \| ^
	* \| \| \| \|
	* \| +-----------------------+ \|
	* \| (DSP Probe OK) \|
	* \| \|
	* \| \|
	* +------------------------------------+
	* (System Suspend/Runtime Suspend)
	*/

	static int sof_probe_continue(struct snd_sof_dev *sdev)
	{
	struct snd_sof_pdata *plat_data = sdev->pdata;
	int ret;

	/* probe the DSP hardware */
	ret = snd_sof_probe(sdev);
	if (ret < 0) {
	dev_err(sdev->dev, "error: failed to probe DSP %d\n", ret);
	return ret;
	}

	sof_set_fw_state(sdev, SOF_FW_BOOT_PREPARE);

	/* check machine info */
	ret = sof_machine_check(sdev);
	if (ret < 0) {
	dev_err(sdev->dev, "error: failed to get machine info %d\n",
	ret);
	goto dsp_err;
	}

	/* set up platform component driver */
	snd_sof_new_platform_drv(sdev);

	/* register any debug/trace capabilities */
	ret = snd_sof_dbg_init(sdev);
	if (ret < 0) {
	/*
	* debugfs issues are suppressed in snd_sof_dbg_init() since
	* we cannot rely on debugfs
	* here we trap errors due to memory allocation only.
	*/
	dev_err(sdev->dev, "error: failed to init DSP trace/debug %d\n",
	ret);
	goto dbg_err;
	}

	/* init the IPC */
	sdev->ipc = snd_sof_ipc_init(sdev);
	if (!sdev->ipc) {
	ret = -ENOMEM;
	dev_err(sdev->dev, "error: failed to init DSP IPC %d\n", ret);
	goto ipc_err;
	}

	/* load the firmware */
	ret = snd_sof_load_firmware(sdev);
	if (ret < 0) {
	dev_err(sdev->dev, "error: failed to load DSP firmware %d\n",
	ret);
	sof_set_fw_state(sdev, SOF_FW_BOOT_FAILED);
	goto fw_load_err;
	}

	sof_set_fw_state(sdev, SOF_FW_BOOT_IN_PROGRESS);

	/*
	* Boot the firmware. The FW boot status will be modified
	* in snd_sof_run_firmware() depending on the outcome.
	*/
	ret = snd_sof_run_firmware(sdev);
	if (ret < 0) {
	dev_err(sdev->dev, "error: failed to boot DSP firmware %d\n",
	ret);
	sof_set_fw_state(sdev, SOF_FW_BOOT_FAILED);
	goto fw_run_err;
	}

	if (sof_debug_check_flag(SOF_DBG_ENABLE_TRACE)) {
	sdev->fw_trace_is_supported = true;

	/* init firmware tracing */
	ret = sof_fw_trace_init(sdev);
	if (ret < 0) {
	/* non fatal */
	dev_warn(sdev->dev, "failed to initialize firmware tracing %d\n",
	ret);
	}
	} else {
	dev_dbg(sdev->dev, "SOF firmware trace disabled\n");
	}

	/* hereafter all FW boot flows are for PM reasons */
	sdev->first_boot = false;

	/* now register audio DSP platform driver and dai */
	ret = devm_snd_soc_register_component(sdev->dev, &sdev->plat_drv,
	sof_ops(sdev)->drv,
	sof_ops(sdev)->num_drv);
	if (ret < 0) {
	dev_err(sdev->dev,
	"error: failed to register DSP DAI driver %d\n", ret);
	goto fw_trace_err;
	}

	ret = snd_sof_machine_register(sdev, plat_data);
	if (ret < 0) {
	dev_err(sdev->dev,
	"error: failed to register machine driver %d\n", ret);
	goto fw_trace_err;
	}

	ret = sof_register_clients(sdev);
	if (ret < 0) {
	dev_err(sdev->dev, "failed to register clients %d\n", ret);
	goto sof_machine_err;
	}

	/*
	* Some platforms in SOF, ex: BYT, may not have their platform PM
	* callbacks set. Increment the usage count so as to
	* prevent the device from entering runtime suspend.
	*/
	if (!sof_ops(sdev)->runtime_suspend \|\| !sof_ops(sdev)->runtime_resume)
	pm_runtime_get_noresume(sdev->dev);

	if (plat_data->sof_probe_complete)
	plat_data->sof_probe_complete(sdev->dev);

	sdev->probe_completed = true;

	return 0;

	sof_machine_err:
	snd_sof_machine_unregister(sdev, plat_data);
	fw_trace_err:
	sof_fw_trace_free(sdev);
	fw_run_err:
	snd_sof_fw_unload(sdev);
	fw_load_err:
	snd_sof_ipc_free(sdev);
	ipc_err:
	dbg_err:
	snd_sof_free_debug(sdev);
	dsp_err:
	snd_sof_remove(sdev);

	/* all resources freed, update state to match */
	sof_set_fw_state(sdev, SOF_FW_BOOT_NOT_STARTED);
	sdev->first_boot = true;

	return ret;
	}

	static void sof_probe_work(struct work_struct *work)
	{
	struct snd_sof_dev *sdev =
	container_of(work, struct snd_sof_dev, probe_work);
	int ret;

	ret = sof_probe_continue(sdev);
	if (ret < 0) {
	/* errors cannot be propagated, log */
	dev_err(sdev->dev, "error: %s failed err: %d\n", __func__, ret);
	}
	}

	int snd_sof_device_probe(struct device dev, struct snd_sof_pdata plat_data)
	{
	struct snd_sof_dev *sdev;
	int ret;

	sdev = devm_kzalloc(dev, sizeof(*sdev), GFP_KERNEL);
	if (!sdev)
	return -ENOMEM;

	/* initialize sof device */
	sdev->dev = dev;

	/* initialize default DSP power state */
	sdev->dsp_power_state.state = SOF_DSP_PM_D0;

	sdev->pdata = plat_data;
	sdev->first_boot = true;
	dev_set_drvdata(dev, sdev);

	/* check IPC support */
	if (!(BIT(plat_data->ipc_type) & plat_data->desc->ipc_supported_mask)) {
	dev_err(dev, "ipc_type %d is not supported on this platform, mask is %#x\n",
	plat_data->ipc_type, plat_data->desc->ipc_supported_mask);
	return -EINVAL;
	}

	/* init ops, if necessary */
	ret = sof_ops_init(sdev);
	if (ret < 0)
	return ret;

	/* check all mandatory ops */
	if (!sof_ops(sdev) \|\| !sof_ops(sdev)->probe \|\| !sof_ops(sdev)->run \|\|
	!sof_ops(sdev)->block_read \|\| !sof_ops(sdev)->block_write \|\|
	!sof_ops(sdev)->send_msg \|\| !sof_ops(sdev)->load_firmware \|\|
	!sof_ops(sdev)->ipc_msg_data) {
	dev_err(dev, "error: missing mandatory ops\n");
	return -EINVAL;
	}

	INIT_LIST_HEAD(&sdev->pcm_list);
	INIT_LIST_HEAD(&sdev->kcontrol_list);
	INIT_LIST_HEAD(&sdev->widget_list);
	INIT_LIST_HEAD(&sdev->dai_list);
	INIT_LIST_HEAD(&sdev->dai_link_list);
	INIT_LIST_HEAD(&sdev->route_list);
	INIT_LIST_HEAD(&sdev->ipc_client_list);
	INIT_LIST_HEAD(&sdev->ipc_rx_handler_list);
	INIT_LIST_HEAD(&sdev->fw_state_handler_list);
	spin_lock_init(&sdev->ipc_lock);
	spin_lock_init(&sdev->hw_lock);
	mutex_init(&sdev->power_state_access);
	mutex_init(&sdev->ipc_client_mutex);
	mutex_init(&sdev->client_event_handler_mutex);

	/* set default timeouts if none provided */
	if (plat_data->desc->ipc_timeout == 0)
	sdev->ipc_timeout = TIMEOUT_DEFAULT_IPC_MS;
	else
	sdev->ipc_timeout = plat_data->desc->ipc_timeout;
	if (plat_data->desc->boot_timeout == 0)
	sdev->boot_timeout = TIMEOUT_DEFAULT_BOOT_MS;
	else
	sdev->boot_timeout = plat_data->desc->boot_timeout;

	sof_set_fw_state(sdev, SOF_FW_BOOT_NOT_STARTED);

	if (IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE)) {
	INIT_WORK(&sdev->probe_work, sof_probe_work);
	schedule_work(&sdev->probe_work);
	return 0;
	}

	return sof_probe_continue(sdev);
	}
	EXPORT_SYMBOL(snd_sof_device_probe);

	bool snd_sof_device_probe_completed(struct device *dev)
	{
	struct snd_sof_dev *sdev = dev_get_drvdata(dev);

	return sdev->probe_completed;
	}
	EXPORT_SYMBOL(snd_sof_device_probe_completed);

	int snd_sof_device_remove(struct device *dev)
	{
	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
	struct snd_sof_pdata *pdata = sdev->pdata;
	int ret;

	if (IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE))
	cancel_work_sync(&sdev->probe_work);

	/*
	* Unregister any registered client device first before IPC and debugfs
	* to allow client drivers to be removed cleanly
	*/
	sof_unregister_clients(sdev);

	/*
	* Unregister machine driver. This will unbind the snd_card which
	* will remove the component driver and unload the topology
	* before freeing the snd_card.
	*/
	snd_sof_machine_unregister(sdev, pdata);

	if (sdev->fw_state > SOF_FW_BOOT_NOT_STARTED) {
	sof_fw_trace_free(sdev);
	ret = snd_sof_dsp_power_down_notify(sdev);
	if (ret < 0)
	dev_warn(dev, "error: %d failed to prepare DSP for device removal",
	ret);

	snd_sof_ipc_free(sdev);
	snd_sof_free_debug(sdev);
	snd_sof_remove(sdev);
	}

	/* release firmware */
	snd_sof_fw_unload(sdev);

	return 0;
	}
	EXPORT_SYMBOL(snd_sof_device_remove);

	int snd_sof_device_shutdown(struct device *dev)
	{
	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
	struct snd_sof_pdata *pdata = sdev->pdata;

	if (IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE))
	cancel_work_sync(&sdev->probe_work);

	/*
	* make sure clients and machine driver(s) are unregistered to force
	* all userspace devices to be closed prior to the DSP shutdown sequence
	*/
	sof_unregister_clients(sdev);

	snd_sof_machine_unregister(sdev, pdata);

	if (sdev->fw_state == SOF_FW_BOOT_COMPLETE)
	return snd_sof_shutdown(sdev);

	return 0;
	}
	EXPORT_SYMBOL(snd_sof_device_shutdown);

	MODULE_AUTHOR("Liam Girdwood");
	MODULE_DESCRIPTION("Sound Open Firmware (SOF) Core");
	MODULE_LICENSE("Dual BSD/GPL");
	MODULE_ALIAS("platform:sof-audio");
	MODULE_IMPORT_NS(SND_SOC_SOF_CLIENT);