drivers/remoteproc/wkup_m3_rproc.c - linux - Git at Google

 /*
  * TI AMx3 Wakeup M3 Remote Processor driver
  *
  * Copyright (C) 2014-2015 Texas Instruments, Inc.
  *
  * Dave Gerlach <d-gerlach@ti.com>
  * Suman Anna <s-anna@ti.com>
  *
  * 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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/err.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/of_address.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/remoteproc.h>

 #include <linux/platform_data/wkup_m3.h>

 #include "remoteproc_internal.h"

 #define WKUPM3_MEM_MAX	2

 /**
  * struct wkup_m3_mem - WkupM3 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 from Wakeup M3 view
  * @size: Size of the memory region
  */
 struct wkup_m3_mem {
 	void __iomem *cpu_addr;
 	phys_addr_t bus_addr;
 	u32 dev_addr;
 	size_t size;
 };

 /**
  * struct wkup_m3_rproc - WkupM3 remote processor state
  * @rproc: rproc handle
  * @pdev: pointer to platform device
  * @mem: WkupM3 memory information
  */
 struct wkup_m3_rproc {
 	struct rproc *rproc;
 	struct platform_device *pdev;
 	struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
 };

 static int wkup_m3_rproc_start(struct rproc *rproc)
 {
 	struct wkup_m3_rproc *wkupm3 = rproc->priv;
 	struct platform_device *pdev = wkupm3->pdev;
 	struct device *dev = &pdev->dev;
 	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);

 	if (pdata->deassert_reset(pdev, pdata->reset_name)) {
 		dev_err(dev, "Unable to reset wkup_m3!\n");
 		return -ENODEV;
 	}

 	return 0;
 }

 static int wkup_m3_rproc_stop(struct rproc *rproc)
 {
 	struct wkup_m3_rproc *wkupm3 = rproc->priv;
 	struct platform_device *pdev = wkupm3->pdev;
 	struct device *dev = &pdev->dev;
 	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);

 	if (pdata->assert_reset(pdev, pdata->reset_name)) {
 		dev_err(dev, "Unable to assert reset of wkup_m3!\n");
 		return -ENODEV;
 	}

 	return 0;
 }

 static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
 {
 	struct wkup_m3_rproc *wkupm3 = rproc->priv;
 	void *va = NULL;
 	int i;
 	u32 offset;

 	if (len <= 0)
 		return NULL;

 	for (i = 0; i < WKUPM3_MEM_MAX; i++) {
 		if (da >= wkupm3->mem[i].dev_addr && da + len <=
 		    wkupm3->mem[i].dev_addr +  wkupm3->mem[i].size) {
 			offset = da -  wkupm3->mem[i].dev_addr;
 			/* __force to make sparse happy with type conversion */
 			va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
 			break;
 		}
 	}

 	return va;
 }

 static const struct rproc_ops wkup_m3_rproc_ops = {
 	.start		= wkup_m3_rproc_start,
 	.stop		= wkup_m3_rproc_stop,
 	.da_to_va	= wkup_m3_rproc_da_to_va,
 };

 static const struct of_device_id wkup_m3_rproc_of_match[] = {
 	{ .compatible = "ti,am3352-wkup-m3", },
 	{ .compatible = "ti,am4372-wkup-m3", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);

 static int wkup_m3_rproc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct wkup_m3_platform_data *pdata = dev->platform_data;
 	/* umem always needs to be processed first */
 	const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
 	struct wkup_m3_rproc *wkupm3;
 	const char *fw_name;
 	struct rproc *rproc;
 	struct resource *res;
 	const __be32 *addrp;
 	u32 l4_offset = 0;
 	u64 size;
 	int ret;
 	int i;

 	if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
 	      pdata->reset_name)) {
 		dev_err(dev, "Platform data missing!\n");
 		return -ENODEV;
 	}

 	ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
 				      &fw_name);
 	if (ret) {
 		dev_err(dev, "No firmware filename given\n");
 		return -ENODEV;
 	}

 	pm_runtime_enable(&pdev->dev);
 	ret = pm_runtime_get_sync(&pdev->dev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
 		goto err;
 	}

 	rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
 			    fw_name, sizeof(*wkupm3));
 	if (!rproc) {
 		ret = -ENOMEM;
 		goto err;
 	}

 	rproc->auto_boot = false;

 	wkupm3 = rproc->priv;
 	wkupm3->rproc = rproc;
 	wkupm3->pdev = pdev;

 	for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
 		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 						   mem_names[i]);
 		wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
 		if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
 			dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
 				i);
 			ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
 			goto err;
 		}
 		wkupm3->mem[i].bus_addr = res->start;
 		wkupm3->mem[i].size = resource_size(res);
 		addrp = of_get_address(dev->of_node, i, &size, NULL);
 		/*
 		 * The wkupm3 has umem at address 0 in its view, so the device
 		 * addresses for each memory region is computed as a relative
 		 * offset of the bus address for umem, and therefore needs to be
 		 * processed first.
 		 */
 		if (!strcmp(mem_names[i], "umem"))
 			l4_offset = be32_to_cpu(*addrp);
 		wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
 	}

 	dev_set_drvdata(dev, rproc);

 	ret = rproc_add(rproc);
 	if (ret) {
 		dev_err(dev, "rproc_add failed\n");
 		goto err_put_rproc;
 	}

 	return 0;

 err_put_rproc:
 	rproc_free(rproc);
 err:
 	pm_runtime_put_noidle(dev);
 	pm_runtime_disable(dev);
 	return ret;
 }

 static int wkup_m3_rproc_remove(struct platform_device *pdev)
 {
 	struct rproc *rproc = platform_get_drvdata(pdev);

 	rproc_del(rproc);
 	rproc_free(rproc);
 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);

 	return 0;
 }

 #ifdef CONFIG_PM
 static int wkup_m3_rpm_suspend(struct device *dev)
 {
 	return -EBUSY;
 }

 static int wkup_m3_rpm_resume(struct device *dev)
 {
 	return 0;
 }
 #endif

 static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
 	SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
 };

 static struct platform_driver wkup_m3_rproc_driver = {
 	.probe = wkup_m3_rproc_probe,
 	.remove = wkup_m3_rproc_remove,
 	.driver = {
 		.name = "wkup_m3_rproc",
 		.of_match_table = wkup_m3_rproc_of_match,
 		.pm = &wkup_m3_rproc_pm_ops,
 	},
 };

 module_platform_driver(wkup_m3_rproc_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
 MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
	/*
	* TI AMx3 Wakeup M3 Remote Processor driver
	*
	* Copyright (C) 2014-2015 Texas Instruments, Inc.
	*
	* Dave Gerlach <d-gerlach@ti.com>
	* Suman Anna <s-anna@ti.com>
	*
	* 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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/err.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/of_address.h>
	#include <linux/platform_device.h>
	#include <linux/pm_runtime.h>
	#include <linux/remoteproc.h>

	#include <linux/platform_data/wkup_m3.h>

	#include "remoteproc_internal.h"

	#define WKUPM3_MEM_MAX 2

	/**
	* struct wkup_m3_mem - WkupM3 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 from Wakeup M3 view
	* @size: Size of the memory region
	*/
	struct wkup_m3_mem {
	void __iomem *cpu_addr;
	phys_addr_t bus_addr;
	u32 dev_addr;
	size_t size;
	};

	/**
	* struct wkup_m3_rproc - WkupM3 remote processor state
	* @rproc: rproc handle
	* @pdev: pointer to platform device
	* @mem: WkupM3 memory information
	*/
	struct wkup_m3_rproc {
	struct rproc *rproc;
	struct platform_device *pdev;
	struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
	};

	static int wkup_m3_rproc_start(struct rproc *rproc)
	{
	struct wkup_m3_rproc *wkupm3 = rproc->priv;
	struct platform_device *pdev = wkupm3->pdev;
	struct device *dev = &pdev->dev;
	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);

	if (pdata->deassert_reset(pdev, pdata->reset_name)) {
	dev_err(dev, "Unable to reset wkup_m3!\n");
	return -ENODEV;
	}

	return 0;
	}

	static int wkup_m3_rproc_stop(struct rproc *rproc)
	{
	struct wkup_m3_rproc *wkupm3 = rproc->priv;
	struct platform_device *pdev = wkupm3->pdev;
	struct device *dev = &pdev->dev;
	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);

	if (pdata->assert_reset(pdev, pdata->reset_name)) {
	dev_err(dev, "Unable to assert reset of wkup_m3!\n");
	return -ENODEV;
	}

	return 0;
	}

	static void wkup_m3_rproc_da_to_va(struct rproc rproc, u64 da, int len)
	{
	struct wkup_m3_rproc *wkupm3 = rproc->priv;
	void *va = NULL;
	int i;
	u32 offset;

	if (len <= 0)
	return NULL;

	for (i = 0; i < WKUPM3_MEM_MAX; i++) {
	if (da >= wkupm3->mem[i].dev_addr && da + len <=
	wkupm3->mem[i].dev_addr + wkupm3->mem[i].size) {
	offset = da - wkupm3->mem[i].dev_addr;
	/* __force to make sparse happy with type conversion */
	va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
	break;
	}
	}

	return va;
	}

	static const struct rproc_ops wkup_m3_rproc_ops = {
	.start = wkup_m3_rproc_start,
	.stop = wkup_m3_rproc_stop,
	.da_to_va = wkup_m3_rproc_da_to_va,
	};

	static const struct of_device_id wkup_m3_rproc_of_match[] = {
	{ .compatible = "ti,am3352-wkup-m3", },
	{ .compatible = "ti,am4372-wkup-m3", },
	{},
	};
	MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);

	static int wkup_m3_rproc_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct wkup_m3_platform_data *pdata = dev->platform_data;
	/* umem always needs to be processed first */
	const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
	struct wkup_m3_rproc *wkupm3;
	const char *fw_name;
	struct rproc *rproc;
	struct resource *res;
	const __be32 *addrp;
	u32 l4_offset = 0;
	u64 size;
	int ret;
	int i;

	if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
	pdata->reset_name)) {
	dev_err(dev, "Platform data missing!\n");
	return -ENODEV;
	}

	ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
	&fw_name);
	if (ret) {
	dev_err(dev, "No firmware filename given\n");
	return -ENODEV;
	}

	pm_runtime_enable(&pdev->dev);
	ret = pm_runtime_get_sync(&pdev->dev);
	if (ret < 0) {
	dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
	goto err;
	}

	rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
	fw_name, sizeof(*wkupm3));
	if (!rproc) {
	ret = -ENOMEM;
	goto err;
	}

	rproc->auto_boot = false;

	wkupm3 = rproc->priv;
	wkupm3->rproc = rproc;
	wkupm3->pdev = pdev;

	for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	mem_names[i]);
	wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
	if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
	dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
	i);
	ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
	goto err;
	}
	wkupm3->mem[i].bus_addr = res->start;
	wkupm3->mem[i].size = resource_size(res);
	addrp = of_get_address(dev->of_node, i, &size, NULL);
	/*
	* The wkupm3 has umem at address 0 in its view, so the device
	* addresses for each memory region is computed as a relative
	* offset of the bus address for umem, and therefore needs to be
	* processed first.
	*/
	if (!strcmp(mem_names[i], "umem"))
	l4_offset = be32_to_cpu(*addrp);
	wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
	}

	dev_set_drvdata(dev, rproc);

	ret = rproc_add(rproc);
	if (ret) {
	dev_err(dev, "rproc_add failed\n");
	goto err_put_rproc;
	}

	return 0;

	err_put_rproc:
	rproc_free(rproc);
	err:
	pm_runtime_put_noidle(dev);
	pm_runtime_disable(dev);
	return ret;
	}

	static int wkup_m3_rproc_remove(struct platform_device *pdev)
	{
	struct rproc *rproc = platform_get_drvdata(pdev);

	rproc_del(rproc);
	rproc_free(rproc);
	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

	return 0;
	}

	#ifdef CONFIG_PM
	static int wkup_m3_rpm_suspend(struct device *dev)
	{
	return -EBUSY;
	}

	static int wkup_m3_rpm_resume(struct device *dev)
	{
	return 0;
	}
	#endif

	static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
	SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
	};

	static struct platform_driver wkup_m3_rproc_driver = {
	.probe = wkup_m3_rproc_probe,
	.remove = wkup_m3_rproc_remove,
	.driver = {
	.name = "wkup_m3_rproc",
	.of_match_table = wkup_m3_rproc_of_match,
	.pm = &wkup_m3_rproc_pm_ops,
	},
	};

	module_platform_driver(wkup_m3_rproc_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
	MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");