linux-imx

/*

 * Bus driver for MIPS Common Device Memory Map (CDMM).

 *

 * Copyright (C) 2014-2015 Imagination Technologies Ltd.

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 */

​

#include <linux/atomic.h>

#include <linux/err.h>

#include <linux/cpu.h>

#include <linux/cpumask.h>

#include <linux/io.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/smp.h>

#include <asm/cdmm.h>

#include <asm/hazards.h>

#include <asm/mipsregs.h>

​

/* Access control and status register fields */

#define CDMM_ACSR_DEVTYPE_SHIFT 24

#define CDMM_ACSR_DEVTYPE   (255ul << CDMM_ACSR_DEVTYPE_SHIFT)

#define CDMM_ACSR_DEVSIZE_SHIFT 16

#define CDMM_ACSR_DEVSIZE   (31ul << CDMM_ACSR_DEVSIZE_SHIFT)

#define CDMM_ACSR_DEVREV_SHIFT  12

#define CDMM_ACSR_DEVREV    (15ul << CDMM_ACSR_DEVREV_SHIFT)

#define CDMM_ACSR_UW        (1ul << 3)

#define CDMM_ACSR_UR        (1ul << 2)

#define CDMM_ACSR_SW        (1ul << 1)

#define CDMM_ACSR_SR        (1ul << 0)

​

/* Each block of device registers is 64 bytes */

#define CDMM_DRB_SIZE       64

​

#define to_mips_cdmm_driver(d)  container_of(d, struct mips_cdmm_driver, drv)

​

/* Default physical base address */

static phys_addr_t mips_cdmm_default_base;

​

/* Bus operations */

​

static const struct mips_cdmm_device_id *

mips_cdmm_lookup(const struct mips_cdmm_device_id *table,

         struct mips_cdmm_device *dev)

{

    int ret = 0;

​

    for (; table->type; ++table) {

        ret = (dev->type == table->type);

        if (ret)

            break;

    }

​

    return ret ? table : NULL;

}

​

static int mips_cdmm_match(struct device *dev, struct device_driver *drv)

{

    struct mips_cdmm_device *cdev = to_mips_cdmm_device(dev);

    struct mips_cdmm_driver *cdrv = to_mips_cdmm_driver(drv);

​

    return mips_cdmm_lookup(cdrv->id_table, cdev) != NULL;

}

​

static int mips_cdmm_uevent(struct device *dev, struct kobj_uevent_env *env)

{

    struct mips_cdmm_device *cdev = to_mips_cdmm_device(dev);

    int retval = 0;

​

    retval = add_uevent_var(env, "CDMM_CPU=%u", cdev->cpu);

    if (retval)

        return retval;

​

    retval = add_uevent_var(env, "CDMM_TYPE=0x%02x", cdev->type);

    if (retval)

        return retval;

​

    retval = add_uevent_var(env, "CDMM_REV=%u", cdev->rev);

    if (retval)

        return retval;

​

    retval = add_uevent_var(env, "MODALIAS=mipscdmm:t%02X", cdev->type);

    return retval;

}

​

/* Device attributes */

​

#define CDMM_ATTR(name, fmt, arg...)                    \

static ssize_t name##_show(struct device *_dev,             \