drivers/remoteproc/da8xx_remoteproc.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Remote processor machine-specific module for DA8XX
  *
  * Copyright (C) 2013 Texas Instruments, Inc.
  */

 #include <linux/bitops.h>
 #include <linux/clk.h>
 #include <linux/reset.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_reserved_mem.h>
 #include <linux/platform_device.h>
 #include <linux/remoteproc.h>

 #include "remoteproc_internal.h"

 static char *da8xx_fw_name;
 module_param(da8xx_fw_name, charp, 0444);
 MODULE_PARM_DESC(da8xx_fw_name,
 		 "Name of DSP firmware file in /lib/firmware (if not specified defaults to 'rproc-dsp-fw')");

 /*
  * OMAP-L138 Technical References:
  * http://www.ti.com/product/omap-l138
  */
 #define SYSCFG_CHIPSIG0 BIT(0)
 #define SYSCFG_CHIPSIG1 BIT(1)
 #define SYSCFG_CHIPSIG2 BIT(2)
 #define SYSCFG_CHIPSIG3 BIT(3)
 #define SYSCFG_CHIPSIG4 BIT(4)

 #define DA8XX_RPROC_LOCAL_ADDRESS_MASK	(SZ_16M - 1)

 /**
  * struct da8xx_rproc_mem - internal memory structure
  * @cpu_addr: MPU virtual address of the memory region
  * @bus_addr: Bus address used to access the memory region
  * @dev_addr: Device address of the memory region from DSP view
  * @size: Size of the memory region
  */
 struct da8xx_rproc_mem {
 	void __iomem *cpu_addr;
 	phys_addr_t bus_addr;
 	u32 dev_addr;
 	size_t size;
 };

 /**
  * struct da8xx_rproc - da8xx remote processor instance state
  * @rproc: rproc handle
  * @mem: internal memory regions data
  * @num_mems: number of internal memory regions
  * @dsp_clk: placeholder for platform's DSP clk
  * @ack_fxn: chip-specific ack function for ack'ing irq
  * @irq_data: ack_fxn function parameter
  * @chipsig: virt ptr to DSP interrupt registers (CHIPSIG & CHIPSIG_CLR)
  * @bootreg: virt ptr to DSP boot address register (HOST1CFG)
  * @irq: irq # used by this instance
  */
 struct da8xx_rproc {
 	struct rproc *rproc;
 	struct da8xx_rproc_mem *mem;
 	int num_mems;
 	struct clk *dsp_clk;
 	struct reset_control *dsp_reset;
 	void (*ack_fxn)(struct irq_data *data);
 	struct irq_data *irq_data;
 	void __iomem *chipsig;
 	void __iomem *bootreg;
 	int irq;
 };

 /**
  * handle_event() - inbound virtqueue message workqueue function
  *
  * This function is registered as a kernel thread and is scheduled by the
  * kernel handler.
  */
 static irqreturn_t handle_event(int irq, void *p)
 {
 	struct rproc *rproc = p;

 	/* Process incoming buffers on all our vrings */
 	rproc_vq_interrupt(rproc, 0);
 	rproc_vq_interrupt(rproc, 1);

 	return IRQ_HANDLED;
 }

 /**
  * da8xx_rproc_callback() - inbound virtqueue message handler
  *
  * This handler is invoked directly by the kernel whenever the remote
  * core (DSP) has modified the state of a virtqueue.  There is no
  * "payload" message indicating the virtqueue index as is the case with
  * mailbox-based implementations on OMAP4.  As such, this handler "polls"
  * each known virtqueue index for every invocation.
  */
 static irqreturn_t da8xx_rproc_callback(int irq, void *p)
 {
 	struct rproc *rproc = p;
 	struct da8xx_rproc *drproc = rproc->priv;
 	u32 chipsig;

 	chipsig = readl(drproc->chipsig);
 	if (chipsig & SYSCFG_CHIPSIG0) {
 		/* Clear interrupt level source */
 		writel(SYSCFG_CHIPSIG0, drproc->chipsig + 4);

 		/*
 		 * ACK intr to AINTC.
 		 *
 		 * It has already been ack'ed by the kernel before calling
 		 * this function, but since the ARM<->DSP interrupts in the
 		 * CHIPSIG register are "level" instead of "pulse" variety,
 		 * we need to ack it after taking down the level else we'll
 		 * be called again immediately after returning.
 		 */
 		drproc->ack_fxn(drproc->irq_data);

 		return IRQ_WAKE_THREAD;
 	}

 	return IRQ_HANDLED;
 }

 static int da8xx_rproc_start(struct rproc *rproc)
 {
 	struct device *dev = rproc->dev.parent;
 	struct da8xx_rproc *drproc = rproc->priv;
 	struct clk *dsp_clk = drproc->dsp_clk;
 	struct reset_control *dsp_reset = drproc->dsp_reset;
 	int ret;

 	/* hw requires the start (boot) address be on 1KB boundary */
 	if (rproc->bootaddr & 0x3ff) {
 		dev_err(dev, "invalid boot address: must be aligned to 1KB\n");

 		return -EINVAL;
 	}

 	writel(rproc->bootaddr, drproc->bootreg);

 	ret = clk_prepare_enable(dsp_clk);
 	if (ret) {
 		dev_err(dev, "clk_prepare_enable() failed: %d\n", ret);
 		return ret;
 	}

 	ret = reset_control_deassert(dsp_reset);
 	if (ret) {
 		dev_err(dev, "reset_control_deassert() failed: %d\n", ret);
 		clk_disable_unprepare(dsp_clk);
 		return ret;
 	}

 	return 0;
 }

 static int da8xx_rproc_stop(struct rproc *rproc)
 {
 	struct da8xx_rproc *drproc = rproc->priv;
 	struct device *dev = rproc->dev.parent;
 	int ret;

 	ret = reset_control_assert(drproc->dsp_reset);
 	if (ret) {
 		dev_err(dev, "reset_control_assert() failed: %d\n", ret);
 		return ret;
 	}

 	clk_disable_unprepare(drproc->dsp_clk);

 	return 0;
 }

 /* kick a virtqueue */
 static void da8xx_rproc_kick(struct rproc *rproc, int vqid)
 {
 	struct da8xx_rproc *drproc = rproc->priv;

 	/* Interrupt remote proc */
 	writel(SYSCFG_CHIPSIG2, drproc->chipsig);
 }

 static const struct rproc_ops da8xx_rproc_ops = {
 	.start = da8xx_rproc_start,
 	.stop = da8xx_rproc_stop,
 	.kick = da8xx_rproc_kick,
 };

 static int da8xx_rproc_get_internal_memories(struct platform_device *pdev,
 					     struct da8xx_rproc *drproc)
 {
 	static const char * const mem_names[] = {"l2sram", "l1pram", "l1dram"};
 	int num_mems = ARRAY_SIZE(mem_names);
 	struct device *dev = &pdev->dev;
 	struct resource *res;
 	int i;

 	drproc->mem = devm_kcalloc(dev, num_mems, sizeof(*drproc->mem),
 				   GFP_KERNEL);
 	if (!drproc->mem)
 		return -ENOMEM;

 	for (i = 0; i < num_mems; i++) {
 		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 						   mem_names[i]);
 		drproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
 		if (IS_ERR(drproc->mem[i].cpu_addr)) {
 			dev_err(dev, "failed to parse and map %s memory\n",
 				mem_names[i]);
 			return PTR_ERR(drproc->mem[i].cpu_addr);
 		}
 		drproc->mem[i].bus_addr = res->start;
 		drproc->mem[i].dev_addr =
 				res->start & DA8XX_RPROC_LOCAL_ADDRESS_MASK;
 		drproc->mem[i].size = resource_size(res);

 		dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %p da 0x%x\n",
 			mem_names[i], &drproc->mem[i].bus_addr,
 			drproc->mem[i].size, drproc->mem[i].cpu_addr,
 			drproc->mem[i].dev_addr);
 	}
 	drproc->num_mems = num_mems;

 	return 0;
 }

 static int da8xx_rproc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct da8xx_rproc *drproc;
 	struct rproc *rproc;
 	struct irq_data *irq_data;
 	struct resource *bootreg_res;
 	struct resource *chipsig_res;
 	struct clk *dsp_clk;
 	struct reset_control *dsp_reset;
 	void __iomem *chipsig;
 	void __iomem *bootreg;
 	int irq;
 	int ret;

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;

 	irq_data = irq_get_irq_data(irq);
 	if (!irq_data) {
 		dev_err(dev, "irq_get_irq_data(%d): NULL\n", irq);
 		return -EINVAL;
 	}

 	bootreg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 						   "host1cfg");
 	bootreg = devm_ioremap_resource(dev, bootreg_res);
 	if (IS_ERR(bootreg))
 		return PTR_ERR(bootreg);

 	chipsig_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 						   "chipsig");
 	chipsig = devm_ioremap_resource(dev, chipsig_res);
 	if (IS_ERR(chipsig))
 		return PTR_ERR(chipsig);

 	dsp_clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(dsp_clk)) {
 		dev_err(dev, "clk_get error: %ld\n", PTR_ERR(dsp_clk));

 		return PTR_ERR(dsp_clk);
 	}

 	dsp_reset = devm_reset_control_get_exclusive(dev, NULL);
 	if (IS_ERR(dsp_reset)) {
 		if (PTR_ERR(dsp_reset) != -EPROBE_DEFER)
 			dev_err(dev, "unable to get reset control: %ld\n",
 				PTR_ERR(dsp_reset));

 		return PTR_ERR(dsp_reset);
 	}

 	if (dev->of_node) {
 		ret = of_reserved_mem_device_init(dev);
 		if (ret) {
 			dev_err(dev, "device does not have specific CMA pool: %d\n",
 				ret);
 			return ret;
 		}
 	}

 	rproc = rproc_alloc(dev, "dsp", &da8xx_rproc_ops, da8xx_fw_name,
 		sizeof(*drproc));
 	if (!rproc) {
 		ret = -ENOMEM;
 		goto free_mem;
 	}

 	/* error recovery is not supported at present */
 	rproc->recovery_disabled = true;

 	drproc = rproc->priv;
 	drproc->rproc = rproc;
 	drproc->dsp_clk = dsp_clk;
 	drproc->dsp_reset = dsp_reset;
 	rproc->has_iommu = false;

 	ret = da8xx_rproc_get_internal_memories(pdev, drproc);
 	if (ret)
 		goto free_rproc;

 	platform_set_drvdata(pdev, rproc);

 	/* everything the ISR needs is now setup, so hook it up */
 	ret = devm_request_threaded_irq(dev, irq, da8xx_rproc_callback,
 					handle_event, 0, "da8xx-remoteproc",
 					rproc);
 	if (ret) {
 		dev_err(dev, "devm_request_threaded_irq error: %d\n", ret);
 		goto free_rproc;
 	}

 	/*
 	 * rproc_add() can end up enabling the DSP's clk with the DSP
 	 * *not* in reset, but da8xx_rproc_start() needs the DSP to be
 	 * held in reset at the time it is called.
 	 */
 	ret = reset_control_assert(dsp_reset);
 	if (ret)
 		goto free_rproc;

 	drproc->chipsig = chipsig;
 	drproc->bootreg = bootreg;
 	drproc->ack_fxn = irq_data->chip->irq_ack;
 	drproc->irq_data = irq_data;
 	drproc->irq = irq;

 	ret = rproc_add(rproc);
 	if (ret) {
 		dev_err(dev, "rproc_add failed: %d\n", ret);
 		goto free_rproc;
 	}

 	return 0;

 free_rproc:
 	rproc_free(rproc);
 free_mem:
 	if (dev->of_node)
 		of_reserved_mem_device_release(dev);
 	return ret;
 }

 static void da8xx_rproc_remove(struct platform_device *pdev)
 {
 	struct rproc *rproc = platform_get_drvdata(pdev);
 	struct da8xx_rproc *drproc = rproc->priv;
 	struct device *dev = &pdev->dev;

 	/*
 	 * The devm subsystem might end up releasing things before
 	 * freeing the irq, thus allowing an interrupt to sneak in while
 	 * the device is being removed.  This should prevent that.
 	 */
 	disable_irq(drproc->irq);

 	rproc_del(rproc);
 	rproc_free(rproc);
 	if (dev->of_node)
 		of_reserved_mem_device_release(dev);
 }

 static const struct of_device_id davinci_rproc_of_match[] __maybe_unused = {
 	{ .compatible = "ti,da850-dsp", },
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, davinci_rproc_of_match);

 static struct platform_driver da8xx_rproc_driver = {
 	.probe = da8xx_rproc_probe,
 	.remove_new = da8xx_rproc_remove,
 	.driver = {
 		.name = "davinci-rproc",
 		.of_match_table = of_match_ptr(davinci_rproc_of_match),
 	},
 };

 module_platform_driver(da8xx_rproc_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("DA8XX Remote Processor control driver");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Remote processor machine-specific module for DA8XX
	*
	* Copyright (C) 2013 Texas Instruments, Inc.
	*/

	#include <linux/bitops.h>
	#include <linux/clk.h>
	#include <linux/reset.h>
	#include <linux/err.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/irq.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of_reserved_mem.h>
	#include <linux/platform_device.h>
	#include <linux/remoteproc.h>

	#include "remoteproc_internal.h"

	static char *da8xx_fw_name;
	module_param(da8xx_fw_name, charp, 0444);
	MODULE_PARM_DESC(da8xx_fw_name,
	"Name of DSP firmware file in /lib/firmware (if not specified defaults to 'rproc-dsp-fw')");

	/*
	* OMAP-L138 Technical References:
	* http://www.ti.com/product/omap-l138
	*/
	#define SYSCFG_CHIPSIG0 BIT(0)
	#define SYSCFG_CHIPSIG1 BIT(1)
	#define SYSCFG_CHIPSIG2 BIT(2)
	#define SYSCFG_CHIPSIG3 BIT(3)
	#define SYSCFG_CHIPSIG4 BIT(4)

	#define DA8XX_RPROC_LOCAL_ADDRESS_MASK (SZ_16M - 1)

	/**
	* struct da8xx_rproc_mem - internal memory structure
	* @cpu_addr: MPU virtual address of the memory region
	* @bus_addr: Bus address used to access the memory region
	* @dev_addr: Device address of the memory region from DSP view
	* @size: Size of the memory region
	*/
	struct da8xx_rproc_mem {
	void __iomem *cpu_addr;
	phys_addr_t bus_addr;
	u32 dev_addr;
	size_t size;
	};

	/**
	* struct da8xx_rproc - da8xx remote processor instance state
	* @rproc: rproc handle
	* @mem: internal memory regions data
	* @num_mems: number of internal memory regions
	* @dsp_clk: placeholder for platform's DSP clk
	* @ack_fxn: chip-specific ack function for ack'ing irq
	* @irq_data: ack_fxn function parameter
	* @chipsig: virt ptr to DSP interrupt registers (CHIPSIG & CHIPSIG_CLR)
	* @bootreg: virt ptr to DSP boot address register (HOST1CFG)
	* @irq: irq # used by this instance
	*/
	struct da8xx_rproc {
	struct rproc *rproc;
	struct da8xx_rproc_mem *mem;
	int num_mems;
	struct clk *dsp_clk;
	struct reset_control *dsp_reset;
	void (ack_fxn)(struct irq_data data);
	struct irq_data *irq_data;
	void __iomem *chipsig;
	void __iomem *bootreg;
	int irq;
	};

	/**
	* handle_event() - inbound virtqueue message workqueue function
	*
	* This function is registered as a kernel thread and is scheduled by the
	* kernel handler.
	*/
	static irqreturn_t handle_event(int irq, void *p)
	{
	struct rproc *rproc = p;

	/* Process incoming buffers on all our vrings */
	rproc_vq_interrupt(rproc, 0);
	rproc_vq_interrupt(rproc, 1);

	return IRQ_HANDLED;
	}

	/**
	* da8xx_rproc_callback() - inbound virtqueue message handler
	*
	* This handler is invoked directly by the kernel whenever the remote
	* core (DSP) has modified the state of a virtqueue. There is no
	* "payload" message indicating the virtqueue index as is the case with
	* mailbox-based implementations on OMAP4. As such, this handler "polls"
	* each known virtqueue index for every invocation.
	*/
	static irqreturn_t da8xx_rproc_callback(int irq, void *p)
	{
	struct rproc *rproc = p;
	struct da8xx_rproc *drproc = rproc->priv;
	u32 chipsig;

	chipsig = readl(drproc->chipsig);
	if (chipsig & SYSCFG_CHIPSIG0) {
	/* Clear interrupt level source */
	writel(SYSCFG_CHIPSIG0, drproc->chipsig + 4);

	/*
	* ACK intr to AINTC.
	*
	* It has already been ack'ed by the kernel before calling
	* this function, but since the ARM<->DSP interrupts in the
	* CHIPSIG register are "level" instead of "pulse" variety,
	* we need to ack it after taking down the level else we'll
	* be called again immediately after returning.
	*/
	drproc->ack_fxn(drproc->irq_data);

	return IRQ_WAKE_THREAD;
	}

	return IRQ_HANDLED;
	}

	static int da8xx_rproc_start(struct rproc *rproc)
	{
	struct device *dev = rproc->dev.parent;
	struct da8xx_rproc *drproc = rproc->priv;
	struct clk *dsp_clk = drproc->dsp_clk;
	struct reset_control *dsp_reset = drproc->dsp_reset;
	int ret;

	/* hw requires the start (boot) address be on 1KB boundary */
	if (rproc->bootaddr & 0x3ff) {
	dev_err(dev, "invalid boot address: must be aligned to 1KB\n");

	return -EINVAL;
	}

	writel(rproc->bootaddr, drproc->bootreg);

	ret = clk_prepare_enable(dsp_clk);
	if (ret) {
	dev_err(dev, "clk_prepare_enable() failed: %d\n", ret);
	return ret;
	}

	ret = reset_control_deassert(dsp_reset);
	if (ret) {
	dev_err(dev, "reset_control_deassert() failed: %d\n", ret);
	clk_disable_unprepare(dsp_clk);
	return ret;
	}

	return 0;
	}

	static int da8xx_rproc_stop(struct rproc *rproc)
	{
	struct da8xx_rproc *drproc = rproc->priv;
	struct device *dev = rproc->dev.parent;
	int ret;

	ret = reset_control_assert(drproc->dsp_reset);
	if (ret) {
	dev_err(dev, "reset_control_assert() failed: %d\n", ret);
	return ret;
	}

	clk_disable_unprepare(drproc->dsp_clk);

	return 0;
	}

	/* kick a virtqueue */
	static void da8xx_rproc_kick(struct rproc *rproc, int vqid)
	{
	struct da8xx_rproc *drproc = rproc->priv;

	/* Interrupt remote proc */
	writel(SYSCFG_CHIPSIG2, drproc->chipsig);
	}

	static const struct rproc_ops da8xx_rproc_ops = {
	.start = da8xx_rproc_start,
	.stop = da8xx_rproc_stop,
	.kick = da8xx_rproc_kick,
	};

	static int da8xx_rproc_get_internal_memories(struct platform_device *pdev,
	struct da8xx_rproc *drproc)
	{
	static const char * const mem_names[] = {"l2sram", "l1pram", "l1dram"};
	int num_mems = ARRAY_SIZE(mem_names);
	struct device *dev = &pdev->dev;
	struct resource *res;
	int i;

	drproc->mem = devm_kcalloc(dev, num_mems, sizeof(*drproc->mem),
	GFP_KERNEL);
	if (!drproc->mem)
	return -ENOMEM;

	for (i = 0; i < num_mems; i++) {
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	mem_names[i]);
	drproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
	if (IS_ERR(drproc->mem[i].cpu_addr)) {
	dev_err(dev, "failed to parse and map %s memory\n",
	mem_names[i]);
	return PTR_ERR(drproc->mem[i].cpu_addr);
	}
	drproc->mem[i].bus_addr = res->start;
	drproc->mem[i].dev_addr =
	res->start & DA8XX_RPROC_LOCAL_ADDRESS_MASK;
	drproc->mem[i].size = resource_size(res);

	dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %p da 0x%x\n",
	mem_names[i], &drproc->mem[i].bus_addr,
	drproc->mem[i].size, drproc->mem[i].cpu_addr,
	drproc->mem[i].dev_addr);
	}
	drproc->num_mems = num_mems;

	return 0;
	}

	static int da8xx_rproc_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct da8xx_rproc *drproc;
	struct rproc *rproc;
	struct irq_data *irq_data;
	struct resource *bootreg_res;
	struct resource *chipsig_res;
	struct clk *dsp_clk;
	struct reset_control *dsp_reset;
	void __iomem *chipsig;
	void __iomem *bootreg;
	int irq;
	int ret;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;

	irq_data = irq_get_irq_data(irq);
	if (!irq_data) {
	dev_err(dev, "irq_get_irq_data(%d): NULL\n", irq);
	return -EINVAL;
	}

	bootreg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	"host1cfg");
	bootreg = devm_ioremap_resource(dev, bootreg_res);
	if (IS_ERR(bootreg))
	return PTR_ERR(bootreg);

	chipsig_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	"chipsig");
	chipsig = devm_ioremap_resource(dev, chipsig_res);
	if (IS_ERR(chipsig))
	return PTR_ERR(chipsig);

	dsp_clk = devm_clk_get(dev, NULL);
	if (IS_ERR(dsp_clk)) {
	dev_err(dev, "clk_get error: %ld\n", PTR_ERR(dsp_clk));

	return PTR_ERR(dsp_clk);
	}

	dsp_reset = devm_reset_control_get_exclusive(dev, NULL);
	if (IS_ERR(dsp_reset)) {
	if (PTR_ERR(dsp_reset) != -EPROBE_DEFER)
	dev_err(dev, "unable to get reset control: %ld\n",
	PTR_ERR(dsp_reset));

	return PTR_ERR(dsp_reset);
	}

	if (dev->of_node) {
	ret = of_reserved_mem_device_init(dev);
	if (ret) {
	dev_err(dev, "device does not have specific CMA pool: %d\n",
	ret);
	return ret;
	}
	}

	rproc = rproc_alloc(dev, "dsp", &da8xx_rproc_ops, da8xx_fw_name,
	sizeof(*drproc));
	if (!rproc) {
	ret = -ENOMEM;
	goto free_mem;
	}

	/* error recovery is not supported at present */
	rproc->recovery_disabled = true;

	drproc = rproc->priv;
	drproc->rproc = rproc;
	drproc->dsp_clk = dsp_clk;
	drproc->dsp_reset = dsp_reset;
	rproc->has_iommu = false;

	ret = da8xx_rproc_get_internal_memories(pdev, drproc);
	if (ret)
	goto free_rproc;

	platform_set_drvdata(pdev, rproc);

	/* everything the ISR needs is now setup, so hook it up */
	ret = devm_request_threaded_irq(dev, irq, da8xx_rproc_callback,
	handle_event, 0, "da8xx-remoteproc",
	rproc);
	if (ret) {
	dev_err(dev, "devm_request_threaded_irq error: %d\n", ret);
	goto free_rproc;
	}

	/*
	* rproc_add() can end up enabling the DSP's clk with the DSP
	* not in reset, but da8xx_rproc_start() needs the DSP to be
	* held in reset at the time it is called.
	*/
	ret = reset_control_assert(dsp_reset);
	if (ret)
	goto free_rproc;

	drproc->chipsig = chipsig;
	drproc->bootreg = bootreg;
	drproc->ack_fxn = irq_data->chip->irq_ack;
	drproc->irq_data = irq_data;
	drproc->irq = irq;

	ret = rproc_add(rproc);
	if (ret) {
	dev_err(dev, "rproc_add failed: %d\n", ret);
	goto free_rproc;
	}

	return 0;

	free_rproc:
	rproc_free(rproc);
	free_mem:
	if (dev->of_node)
	of_reserved_mem_device_release(dev);
	return ret;
	}

	static void da8xx_rproc_remove(struct platform_device *pdev)
	{
	struct rproc *rproc = platform_get_drvdata(pdev);
	struct da8xx_rproc *drproc = rproc->priv;
	struct device *dev = &pdev->dev;

	/*
	* The devm subsystem might end up releasing things before
	* freeing the irq, thus allowing an interrupt to sneak in while
	* the device is being removed. This should prevent that.
	*/
	disable_irq(drproc->irq);

	rproc_del(rproc);
	rproc_free(rproc);
	if (dev->of_node)
	of_reserved_mem_device_release(dev);
	}

	static const struct of_device_id davinci_rproc_of_match[] __maybe_unused = {
	{ .compatible = "ti,da850-dsp", },
	{ /* sentinel */ },
	};
	MODULE_DEVICE_TABLE(of, davinci_rproc_of_match);

	static struct platform_driver da8xx_rproc_driver = {
	.probe = da8xx_rproc_probe,
	.remove_new = da8xx_rproc_remove,
	.driver = {
	.name = "davinci-rproc",
	.of_match_table = of_match_ptr(davinci_rproc_of_match),
	},
	};

	module_platform_driver(da8xx_rproc_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("DA8XX Remote Processor control driver");