linux-imx

/*

 * TI Keystone DSP remoteproc driver

 *

 * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.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/module.h>

#include <linux/slab.h>

#include <linux/io.h>

#include <linux/interrupt.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/workqueue.h>

#include <linux/of_address.h>

#include <linux/of_reserved_mem.h>

#include <linux/of_gpio.h>

#include <linux/regmap.h>

#include <linux/mfd/syscon.h>

#include <linux/remoteproc.h>

#include <linux/reset.h>

​

#include "remoteproc_internal.h"

​

#define KEYSTONE_RPROC_LOCAL_ADDRESS_MASK   (SZ_16M - 1)

​

/**

 * struct keystone_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 keystone_rproc_mem {

    void __iomem *cpu_addr;

    phys_addr_t bus_addr;

    u32 dev_addr;

    size_t size;

};

​

/**

 * struct keystone_rproc - keystone remote processor driver structure

 * @dev: cached device pointer

 * @rproc: remoteproc device handle

 * @mem: internal memory regions data

 * @num_mems: number of internal memory regions

 * @dev_ctrl: device control regmap handle

 * @reset: reset control handle

 * @boot_offset: boot register offset in @dev_ctrl regmap

 * @irq_ring: irq entry for vring

 * @irq_fault: irq entry for exception

 * @kick_gpio: gpio used for virtio kicks

 * @workqueue: workqueue for processing virtio interrupts

 */

struct keystone_rproc {

    struct device *dev;

    struct rproc *rproc;

    struct keystone_rproc_mem *mem;

    int num_mems;

    struct regmap *dev_ctrl;

    struct reset_control *reset;

    u32 boot_offset;

    int irq_ring;

    int irq_fault;

    int kick_gpio;

    struct work_struct workqueue;

};

​

/* Put the DSP processor into reset */

static void keystone_rproc_dsp_reset(struct keystone_rproc *ksproc)

{

    reset_control_assert(ksproc->reset);

}

​

/* Configure the boot address and boot the DSP processor */

static int keystone_rproc_dsp_boot(struct keystone_rproc *ksproc, u32 boot_addr)

{

    int ret;

​

    if (boot_addr & (SZ_1K - 1)) {

        dev_err(ksproc->dev, "invalid boot address 0x%x, must be aligned on a 1KB boundary\n",

            boot_addr);

        return -EINVAL;

    }