linux-imx

/*

 * Copyright (C) 2015 Hisilicon Limited, All Rights Reserved.

 * Author: Jun Ma <majun258@huawei.com>

 * Author: Yun Wu <wuyun.wu@huawei.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.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

​

#include <linux/acpi.h>

#include <linux/interrupt.h>

#include <linux/irqchip.h>

#include <linux/module.h>

#include <linux/msi.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

​

/* Interrupt numbers per mbigen node supported */

#define IRQS_PER_MBIGEN_NODE        128

​

/* 64 irqs (Pin0-pin63) are reserved for each mbigen chip */

#define RESERVED_IRQ_PER_MBIGEN_CHIP    64

​

/* The maximum IRQ pin number of mbigen chip(start from 0) */

#define MAXIMUM_IRQ_PIN_NUM     1407

​

/**

 * In mbigen vector register

 * bit[21:12]:  event id value

 * bit[11:0]:   device id

 */

#define IRQ_EVENT_ID_SHIFT      12

#define IRQ_EVENT_ID_MASK       0x3ff

​

/* register range of each mbigen node */

#define MBIGEN_NODE_OFFSET      0x1000

​

/* offset of vector register in mbigen node */

#define REG_MBIGEN_VEC_OFFSET       0x200

​

/**

 * offset of clear register in mbigen node

 * This register is used to clear the status

 * of interrupt

 */

#define REG_MBIGEN_CLEAR_OFFSET     0xa000

​

/**

 * offset of interrupt type register

 * This register is used to configure interrupt

 * trigger type

 */

#define REG_MBIGEN_TYPE_OFFSET      0x0

​

/**

 * struct mbigen_device - holds the information of mbigen device.

 *

 * @pdev:       pointer to the platform device structure of mbigen chip.

 * @base:       mapped address of this mbigen chip.

 */

struct mbigen_device {

    struct platform_device  *pdev;

    void __iomem        *base;

};

​

static inline unsigned int get_mbigen_vec_reg(irq_hw_number_t hwirq)

{

    unsigned int nid, pin;

​

    hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;

    nid = hwirq / IRQS_PER_MBIGEN_NODE + 1;

    pin = hwirq % IRQS_PER_MBIGEN_NODE;

​

    return pin * 4 + nid * MBIGEN_NODE_OFFSET

            + REG_MBIGEN_VEC_OFFSET;

}

​

static inline void get_mbigen_type_reg(irq_hw_number_t hwirq,

                    u32 *mask, u32 *addr)

{