[linux-2.6-block.git] / drivers / remoteproc / da8xx_remoteproc.c

/*
 * Remote processor machine-specific module for DA8XX
 *
 * Copyright (C) 2013 Texas Instruments, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 */

#include <linux/bitops.h>
#include <linux/clk.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/platform_device.h>
#include <linux/remoteproc.h>

#include <mach/clock.h>   /* for davinci_clk_reset_assert/deassert() */

#include "remoteproc_internal.h"

static char *da8xx_fw_name;
module_param(da8xx_fw_name, charp, S_IRUGO);
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;
	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 = (struct 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 = (struct rproc *)p;
	struct da8xx_rproc *drproc = (struct da8xx_rproc *)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 = (struct da8xx_rproc *)rproc->priv;
	struct clk *dsp_clk = drproc->dsp_clk;

	/* 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);

	clk_enable(dsp_clk);
	davinci_clk_reset_deassert(dsp_clk);

	return 0;
}

static int da8xx_rproc_stop(struct rproc *rproc)
{
	struct da8xx_rproc *drproc = rproc->priv;

	davinci_clk_reset_assert(drproc->dsp_clk);
	clk_disable(drproc->dsp_clk);

	return 0;
}

/* kick a virtqueue */
static void da8xx_rproc_kick(struct rproc *rproc, int vqid)
{
	struct da8xx_rproc *drproc = (struct da8xx_rproc *)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%x 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;
	void __iomem *chipsig;
	void __iomem *bootreg;
	int irq;
	int ret;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(dev, "platform_get_irq(pdev, 0) error: %d\n", irq);
		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);
	}

	rproc = rproc_alloc(dev, "dsp", &da8xx_rproc_ops, da8xx_fw_name,
		sizeof(*drproc));
	if (!rproc)
		return -ENOMEM;

	drproc = rproc->priv;
	drproc->rproc = rproc;
	drproc->dsp_clk = dsp_clk;
	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 = davinci_clk_reset_assert(drproc->dsp_clk);
	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);

	return ret;
}

static int da8xx_rproc_remove(struct platform_device *pdev)
{
	struct rproc *rproc = platform_get_drvdata(pdev);
	struct da8xx_rproc *drproc = (struct da8xx_rproc *)rproc->priv;

	/*
	 * 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);

	return 0;
}

static struct platform_driver da8xx_rproc_driver = {
	.probe = da8xx_rproc_probe,
	.remove = da8xx_rproc_remove,
	.driver = {
		.name = "davinci-rproc",
	},
};

module_platform_driver(da8xx_rproc_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DA8XX Remote Processor control driver");
Commit	Line	Data
13be5432 RT	1	/*
	2	* Remote processor machine-specific module for DA8XX
	3	*
	4	* Copyright (C) 2013 Texas Instruments, Inc.
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* version 2 as published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/bitops.h>
	12	#include <linux/clk.h>
	13	#include <linux/err.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/io.h>
	16	#include <linux/irq.h>
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/remoteproc.h>
	21
	22	#include <mach/clock.h> /* for davinci_clk_reset_assert/deassert() */
	23
	24	#include "remoteproc_internal.h"
	25
	26	static char *da8xx_fw_name;
	27	module_param(da8xx_fw_name, charp, S_IRUGO);
	28	MODULE_PARM_DESC(da8xx_fw_name,
e17aee37	29	"Name of DSP firmware file in /lib/firmware (if not specified defaults to 'rproc-dsp-fw')");
13be5432 RT	30
	31	/*
	32	* OMAP-L138 Technical References:
	33	* http://www.ti.com/product/omap-l138
	34	*/
	35	#define SYSCFG_CHIPSIG0 BIT(0)
	36	#define SYSCFG_CHIPSIG1 BIT(1)
	37	#define SYSCFG_CHIPSIG2 BIT(2)
	38	#define SYSCFG_CHIPSIG3 BIT(3)
	39	#define SYSCFG_CHIPSIG4 BIT(4)
	40
59b2355f SA	41	#define DA8XX_RPROC_LOCAL_ADDRESS_MASK (SZ_16M - 1)
	42
	43	/**
	44	* struct da8xx_rproc_mem - internal memory structure
	45	* @cpu_addr: MPU virtual address of the memory region
	46	* @bus_addr: Bus address used to access the memory region
	47	* @dev_addr: Device address of the memory region from DSP view
	48	* @size: Size of the memory region
	49	*/
	50	struct da8xx_rproc_mem {
	51	void __iomem *cpu_addr;
	52	phys_addr_t bus_addr;
	53	u32 dev_addr;
	54	size_t size;
	55	};
	56
13be5432 RT	57	/**
	58	* struct da8xx_rproc - da8xx remote processor instance state
	59	* @rproc: rproc handle
59b2355f SA	60	* @mem: internal memory regions data
59b2355f SA	61	* @num_mems: number of internal memory regions
13be5432 RT	62	* @dsp_clk: placeholder for platform's DSP clk
	63	* @ack_fxn: chip-specific ack function for ack'ing irq
	64	* @irq_data: ack_fxn function parameter
	65	* @chipsig: virt ptr to DSP interrupt registers (CHIPSIG & CHIPSIG_CLR)
	66	* @bootreg: virt ptr to DSP boot address register (HOST1CFG)
	67	* @irq: irq # used by this instance
	68	*/
	69	struct da8xx_rproc {
	70	struct rproc *rproc;
59b2355f SA	71	struct da8xx_rproc_mem *mem;
59b2355f SA	72	int num_mems;
13be5432 RT	73	struct clk *dsp_clk;
	74	void (ack_fxn)(struct irq_data data);
	75	struct irq_data *irq_data;
	76	void __iomem *chipsig;
	77	void __iomem *bootreg;
	78	int irq;
	79	};
	80
	81	/**
	82	* handle_event() - inbound virtqueue message workqueue function
	83	*
	84	* This function is registered as a kernel thread and is scheduled by the
	85	* kernel handler.
	86	*/
	87	static irqreturn_t handle_event(int irq, void *p)
	88	{
	89	struct rproc rproc = (struct rproc )p;
	90
	91	/* Process incoming buffers on all our vrings */
	92	rproc_vq_interrupt(rproc, 0);
	93	rproc_vq_interrupt(rproc, 1);
	94
	95	return IRQ_HANDLED;
	96	}
	97
	98	/**
	99	* da8xx_rproc_callback() - inbound virtqueue message handler
	100	*
	101	* This handler is invoked directly by the kernel whenever the remote
	102	* core (DSP) has modified the state of a virtqueue. There is no
	103	* "payload" message indicating the virtqueue index as is the case with
	104	* mailbox-based implementations on OMAP4. As such, this handler "polls"
	105	* each known virtqueue index for every invocation.
	106	*/
	107	static irqreturn_t da8xx_rproc_callback(int irq, void *p)
	108	{
	109	struct rproc rproc = (struct rproc )p;
	110	struct da8xx_rproc drproc = (struct da8xx_rproc )rproc->priv;
	111	u32 chipsig;
	112
	113	chipsig = readl(drproc->chipsig);
	114	if (chipsig & SYSCFG_CHIPSIG0) {
	115	/* Clear interrupt level source */
	116	writel(SYSCFG_CHIPSIG0, drproc->chipsig + 4);
	117
	118	/*
	119	* ACK intr to AINTC.
	120	*
	121	* It has already been ack'ed by the kernel before calling
	122	* this function, but since the ARM<->DSP interrupts in the
	123	* CHIPSIG register are "level" instead of "pulse" variety,
	124	* we need to ack it after taking down the level else we'll
	125	* be called again immediately after returning.
	126	*/
	127	drproc->ack_fxn(drproc->irq_data);
	128
	129	return IRQ_WAKE_THREAD;
	130	}
	131
	132	return IRQ_HANDLED;
	133	}
	134
	135	static int da8xx_rproc_start(struct rproc *rproc)
	136	{
137	struct device *dev = rproc->dev.parent;
138	struct da8xx_rproc drproc = (struct da8xx_rproc )rproc->priv;
139	struct clk *dsp_clk = drproc->dsp_clk;
140
141	/* hw requires the start (boot) address be on 1KB boundary */
142	if (rproc->bootaddr & 0x3ff) {
143	dev_err(dev, "invalid boot address: must be aligned to 1KB\n");
144
145	return -EINVAL;
146	}
147
148	writel(rproc->bootaddr, drproc->bootreg);
149
150	clk_enable(dsp_clk);
151	davinci_clk_reset_deassert(dsp_clk);
152
153	return 0;
154	}
155
156	static int da8xx_rproc_stop(struct rproc *rproc)
157	{
158	struct da8xx_rproc *drproc = rproc->priv;
159
a63c70d4	160	davinci_clk_reset_assert(drproc->dsp_clk);
13be5432 RT	161	clk_disable(drproc->dsp_clk);
	162
	163	return 0;
	164	}
	165
	166	/* kick a virtqueue */
	167	static void da8xx_rproc_kick(struct rproc *rproc, int vqid)
	168	{
	169	struct da8xx_rproc drproc = (struct da8xx_rproc )rproc->priv;
	170
56324d7a	171	/* Interrupt remote proc */
13be5432 RT	172	writel(SYSCFG_CHIPSIG2, drproc->chipsig);
	173	}
	174
c008fad2	175	static const struct rproc_ops da8xx_rproc_ops = {
13be5432 RT	176	.start = da8xx_rproc_start,
	177	.stop = da8xx_rproc_stop,
	178	.kick = da8xx_rproc_kick,
	179	};
	180
59b2355f SA	181	static int da8xx_rproc_get_internal_memories(struct platform_device *pdev,
	182	struct da8xx_rproc *drproc)
	183	{
	184	static const char * const mem_names[] = {"l2sram", "l1pram", "l1dram"};
	185	int num_mems = ARRAY_SIZE(mem_names);
	186	struct device *dev = &pdev->dev;
	187	struct resource *res;
	188	int i;
	189
	190	drproc->mem = devm_kcalloc(dev, num_mems, sizeof(*drproc->mem),
	191	GFP_KERNEL);
	192	if (!drproc->mem)
	193	return -ENOMEM;
	194
	195	for (i = 0; i < num_mems; i++) {
	196	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	197	mem_names[i]);
	198	drproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
	199	if (IS_ERR(drproc->mem[i].cpu_addr)) {
	200	dev_err(dev, "failed to parse and map %s memory\n",
	201	mem_names[i]);
	202	return PTR_ERR(drproc->mem[i].cpu_addr);
	203	}
	204	drproc->mem[i].bus_addr = res->start;
	205	drproc->mem[i].dev_addr =
	206	res->start & DA8XX_RPROC_LOCAL_ADDRESS_MASK;
	207	drproc->mem[i].size = resource_size(res);
	208
	209	dev_dbg(dev, "memory %8s: bus addr %pa size 0x%x va %p da 0x%x\n",
	210	mem_names[i], &drproc->mem[i].bus_addr,
	211	drproc->mem[i].size, drproc->mem[i].cpu_addr,
	212	drproc->mem[i].dev_addr);
	213	}
	214	drproc->num_mems = num_mems;
	215
	216	return 0;
	217	}
	218
13be5432 RT	219	static int da8xx_rproc_probe(struct platform_device *pdev)
	220	{
	221	struct device *dev = &pdev->dev;
	222	struct da8xx_rproc *drproc;
	223	struct rproc *rproc;
	224	struct irq_data *irq_data;
	225	struct resource *bootreg_res;
	226	struct resource *chipsig_res;
	227	struct clk *dsp_clk;
	228	void __iomem *chipsig;
	229	void __iomem *bootreg;
	230	int irq;
	231	int ret;
	232
	233	irq = platform_get_irq(pdev, 0);
	234	if (irq < 0) {
	235	dev_err(dev, "platform_get_irq(pdev, 0) error: %d\n", irq);
	236	return irq;
	237	}
	238
	239	irq_data = irq_get_irq_data(irq);
	240	if (!irq_data) {
	241	dev_err(dev, "irq_get_irq_data(%d): NULL\n", irq);
	242	return -EINVAL;
	243	}
	244
6fb9a8f5 SA	245	bootreg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
6fb9a8f5 SA	246	"host1cfg");
13be5432 RT	247	bootreg = devm_ioremap_resource(dev, bootreg_res);
	248	if (IS_ERR(bootreg))
	249	return PTR_ERR(bootreg);
	250
6fb9a8f5 SA	251	chipsig_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
6fb9a8f5 SA	252	"chipsig");
13be5432 RT	253	chipsig = devm_ioremap_resource(dev, chipsig_res);
	254	if (IS_ERR(chipsig))
	255	return PTR_ERR(chipsig);
	256
	257	dsp_clk = devm_clk_get(dev, NULL);
	258	if (IS_ERR(dsp_clk)) {
	259	dev_err(dev, "clk_get error: %ld\n", PTR_ERR(dsp_clk));
	260
	261	return PTR_ERR(dsp_clk);
	262	}
	263
	264	rproc = rproc_alloc(dev, "dsp", &da8xx_rproc_ops, da8xx_fw_name,
	265	sizeof(*drproc));
	266	if (!rproc)
	267	return -ENOMEM;
	268
	269	drproc = rproc->priv;
	270	drproc->rproc = rproc;
470ac62f	271	drproc->dsp_clk = dsp_clk;
315491e5	272	rproc->has_iommu = false;
13be5432	273
59b2355f SA	274	ret = da8xx_rproc_get_internal_memories(pdev, drproc);
	275	if (ret)
	276	goto free_rproc;
	277
13be5432 RT	278	platform_set_drvdata(pdev, rproc);
	279
	280	/* everything the ISR needs is now setup, so hook it up */
	281	ret = devm_request_threaded_irq(dev, irq, da8xx_rproc_callback,
	282	handle_event, 0, "da8xx-remoteproc",
	283	rproc);
	284	if (ret) {
	285	dev_err(dev, "devm_request_threaded_irq error: %d\n", ret);
	286	goto free_rproc;
	287	}
	288
	289	/*
	290	* rproc_add() can end up enabling the DSP's clk with the DSP
	291	* not in reset, but da8xx_rproc_start() needs the DSP to be
	292	* held in reset at the time it is called.
	293	*/
470ac62f	294	ret = davinci_clk_reset_assert(drproc->dsp_clk);
13be5432 RT	295	if (ret)
	296	goto free_rproc;
	297
	298	drproc->chipsig = chipsig;
	299	drproc->bootreg = bootreg;
	300	drproc->ack_fxn = irq_data->chip->irq_ack;
	301	drproc->irq_data = irq_data;
	302	drproc->irq = irq;
13be5432 RT	303
	304	ret = rproc_add(rproc);
	305	if (ret) {
	306	dev_err(dev, "rproc_add failed: %d\n", ret);
	307	goto free_rproc;
	308	}
	309
	310	return 0;
	311
	312	free_rproc:
433c0e04	313	rproc_free(rproc);
13be5432 RT	314
	315	return ret;
	316	}
	317
	318	static int da8xx_rproc_remove(struct platform_device *pdev)
	319	{
13be5432 RT	320	struct rproc *rproc = platform_get_drvdata(pdev);
	321	struct da8xx_rproc drproc = (struct da8xx_rproc )rproc->priv;
	322
13be5432 RT	323	/*
	324	* The devm subsystem might end up releasing things before
	325	* freeing the irq, thus allowing an interrupt to sneak in while
	326	* the device is being removed. This should prevent that.
	327	*/
	328	disable_irq(drproc->irq);
	329
13be5432	330	rproc_del(rproc);
433c0e04	331	rproc_free(rproc);
13be5432 RT	332
	333	return 0;
	334	}
	335
	336	static struct platform_driver da8xx_rproc_driver = {
	337	.probe = da8xx_rproc_probe,
	338	.remove = da8xx_rproc_remove,
	339	.driver = {
	340	.name = "davinci-rproc",
13be5432 RT	341	},
	342	};
	343
	344	module_platform_driver(da8xx_rproc_driver);
	345
	346	MODULE_LICENSE("GPL v2");
	347	MODULE_DESCRIPTION("DA8XX Remote Processor control driver");