arch/arc/include/asm/idu.h

/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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.
 *
 *  Rajeshwar Ranga: Interrupt Distribution Unit API's
 */

#ifndef _ASM_ARC_IDU_H
#define _ASM_ARC_IDU_H

#include <linux/types.h>
#include <asm/arcregs.h>

// IDU supports 256 common interrupts
#define NR_IDU_IRQS     256


#define IDU_SET_COMMAND(irq,cmd)                                        \
    do {                                                                \
        uint32_t val;                                                   \
        val = (((irq & 0xFF) << 8) | (cmd & 0xFF));                     \
        write_new_aux_reg(ARC_AUX_IDU_REG_CMD, val);                    \
    } while (0)

#define IDU_SET_PARAM(par)  write_new_aux_reg(ARC_AUX_IDU_REG_PARAM, par)
#define IDU_GET_PARAM()     read_new_aux_reg(ARC_AUX_IDU_REG_PARAM)


// IDU Commands
#define IDU_DISABLE         0x00
#define IDU_ENABLE          0x01
#define IDU_IRQ_CLEAR       0x02
#define IDU_IRQ_ASSERT      0x03
#define IDU_IRQ_WMODE       0x04
#define IDU_IRQ_STATUS      0x05
#define IDU_IRQ_ACK         0x06
#define IDU_IRQ_PEND        0x07
#define IDU_IRQ_RMODE       0x08
#define IDU_IRQ_WBITMASK    0x09
#define IDU_IRQ_RBITMASK    0x0A


#define idu_enable()  IDU_SET_COMMAND(0, IDU_ENABLE)
#define idu_disable() IDU_SET_COMMAND(0, IDU_DISABLE)

#define idu_irq_assert(irq) IDU_SET_COMMAND(irq, IDU_IRQ_ASSERT)
#define idu_irq_clear(irq)  IDU_SET_COMMAND(irq, IDU_IRQ_CLEAR)



/* IDU Interrupt Mode - Destination Encoding
        idu_irq_mod_sendto_clearedBy         */

#define IDU_IRQ_MOD_DISABLE             0x00
#define IDU_IRQ_MOD_ROUND_RECP          0x01
#define IDU_IRQ_MOD_TCPU_FIRSTRECP      0x02
#define IDU_IRQ_MOD_TCPU_ALLRECP        0x03


// IDU Interrupt Mode Triggering Mode
#define IDU_IRQ_MODE_LEVEL_TRIG         0x00
#define IDU_IRQ_MODE_PULSE_TRIG         0x01

#define IDU_IRQ_MODE_PARAM(dest_mode, trig_mode)   \
        (((trig_mode & 0x01) << 15) | (dest_mode & 0xFF))


typedef struct {
    uint8_t irq;
    uint8_t dest_mode;
    uint8_t trig_mode;
} idu_irq_config_t;


typedef struct {
    uint8_t     irq;
    bool        enabled;
    bool        status;
    bool        ack;
    bool        pend;
    uint8_t     next_rr;
} idu_irq_status_t;


extern void idu_irq_set_mode(uint8_t irq, uint8_t dest_mode, uint8_t trig_mode);
extern idu_irq_config_t idu_irq_get_mode(uint8_t irq);
extern void idu_irq_set_tgtcpu(uint8_t irq, uint32_t mask);
extern uint32_t  idu_irq_get_tgtcpu(uint8_t irq);
extern idu_irq_status_t idu_irq_get_status (uint8_t irq);
extern bool idu_irq_get_ack (uint8_t irq);
extern bool idu_irq_get_pend (uint8_t irq);

#endif