linux-imx

/*

 * Remote Processor Framework

 *

 * Copyright (C) 2011 Texas Instruments, Inc.

 * Copyright (C) 2011 Google, Inc.

 *

 * Ohad Ben-Cohen <ohad@wizery.com>

 * Brian Swetland <swetland@google.com>

 * Mark Grosen <mgrosen@ti.com>

 * Fernando Guzman Lugo <fernando.lugo@ti.com>

 * Suman Anna <s-anna@ti.com>

 * Robert Tivy <rtivy@ti.com>

 * Armando Uribe De Leon <x0095078@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.

 */

​

#define pr_fmt(fmt)    "%s: " fmt, __func__

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/device.h>

#include <linux/slab.h>

#include <linux/mutex.h>

#include <linux/dma-mapping.h>

#include <linux/firmware.h>

#include <linux/string.h>

#include <linux/debugfs.h>

#include <linux/devcoredump.h>

#include <linux/remoteproc.h>

#include <linux/iommu.h>

#include <linux/idr.h>

#include <linux/elf.h>

#include <linux/crc32.h>

#include <linux/of_reserved_mem.h>

#include <linux/virtio_ids.h>

#include <linux/virtio_ring.h>

#include <asm/byteorder.h>

#include <linux/platform_device.h>

​

#include "remoteproc_internal.h"

​

#define HIGH_BITS_MASK 0xFFFFFFFF00000000ULL

​

static DEFINE_MUTEX(rproc_list_mutex);

static LIST_HEAD(rproc_list);

​

typedef int (*rproc_handle_resources_t)(struct rproc *rproc,

                struct resource_table *table, int len);

typedef int (*rproc_handle_resource_t)(struct rproc *rproc,

                 void *, int offset, int avail);

​

static int rproc_alloc_carveout(struct rproc *rproc,

                struct rproc_mem_entry *mem);

static int rproc_release_carveout(struct rproc *rproc,

                  struct rproc_mem_entry *mem);

​

/* Unique indices for remoteproc devices */

static DEFINE_IDA(rproc_dev_index);

​

static const char * const rproc_crash_names[] = {

    [RPROC_MMUFAULT]    = "mmufault",

    [RPROC_WATCHDOG]    = "watchdog",

    [RPROC_FATAL_ERROR] = "fatal error",

};

​

/* translate rproc_crash_type to string */

static const char *rproc_crash_to_string(enum rproc_crash_type type)

{

    if (type < ARRAY_SIZE(rproc_crash_names))

        return rproc_crash_names[type];

    return "unknown";

}

​

/*

 * This is the IOMMU fault handler we register with the IOMMU API

 * (when relevant; not all remote processors access memory through

 * an IOMMU).

 *

 * IOMMU core will invoke this handler whenever the remote processor

 * will try to access an unmapped device address.

 */

static int rproc_iommu_fault(struct iommu_domain *domain, struct device *dev,

                 unsigned long iova, int flags, void *token)

{