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Release 4.11 drivers/remoteproc/wkup_m3_rproc.c

/*
 * 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; }

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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; }

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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; }

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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; }

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Dave Gerlach46898.53%133.33%
Björn Andersson71.47%266.67%
Total475100.00%3100.00%


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; }

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Dave Gerlach4998.00%150.00%
Björn Andersson12.00%150.00%
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#ifdef CONFIG_PM
static int wkup_m3_rpm_suspend(struct device *dev) { return -EBUSY; }

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

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#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>");

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Dave Gerlach105599.15%240.00%
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Bhumika Goyal10.09%120.00%
Total1064100.00%5100.00%
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