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/*

 * Intel XScale PXA Programmable Interrupt Controller.

 *

 * Copyright (c) 2006 Openedhand Ltd.

 * Copyright (c) 2006 Thorsten Zitterell

 * Written by Andrzej Zaborowski <balrog@zabor.org>

 *

 * This code is licensed under the GPL.

 */

#include "hw.h"

#include "pxa.h"

#include "sysbus.h"

#define ICIP        0x00        /* Interrupt Controller IRQ Pending register */

#define ICMR        0x04        /* Interrupt Controller Mask register */

#define ICLR        0x08        /* Interrupt Controller Level register */

#define ICFP        0x0c        /* Interrupt Controller FIQ Pending register */

#define ICPR        0x10        /* Interrupt Controller Pending register */

#define ICCR        0x14        /* Interrupt Controller Control register */

#define ICHP        0x18        /* Interrupt Controller Highest Priority register */

#define IPR0        0x1c        /* Interrupt Controller Priority register 0 */

#define IPR31        0x98        /* Interrupt Controller Priority register 31 */

#define ICIP2        0x9c        /* Interrupt Controller IRQ Pending register 2 */

#define ICMR2        0xa0        /* Interrupt Controller Mask register 2 */

#define ICLR2        0xa4        /* Interrupt Controller Level register 2 */

#define ICFP2        0xa8        /* Interrupt Controller FIQ Pending register 2 */

#define ICPR2        0xac        /* Interrupt Controller Pending register 2 */

#define IPR32        0xb0        /* Interrupt Controller Priority register 32 */

#define IPR39        0xcc        /* Interrupt Controller Priority register 39 */

#define PXA2XX_PIC_SRCS        40

typedef struct {

    SysBusDevice busdev;

    MemoryRegion iomem;

    CPUState *cpu_env;

    uint32_t int_enabled[2];

    uint32_t int_pending[2];

    uint32_t is_fiq[2];

    uint32_t int_idle;

    uint32_t priority[PXA2XX_PIC_SRCS];

} PXA2xxPICState;

static void pxa2xx_pic_update(void *opaque)

{

    uint32_t mask[2];

    PXA2xxPICState *s = (PXA2xxPICState *) opaque;

    if (s->cpu_env->halted) {

        mask[0] = s->int_pending[0] & (s->int_enabled[0] | s->int_idle);

        mask[1] = s->int_pending[1] & (s->int_enabled[1] | s->int_idle);

        if (mask[0] || mask[1])

            cpu_interrupt(s->cpu_env, CPU_INTERRUPT_EXITTB);

    }

    mask[0] = s->int_pending[0] & s->int_enabled[0];

    mask[1] = s->int_pending[1] & s->int_enabled[1];

    if ((mask[0] & s->is_fiq[0]) || (mask[1] & s->is_fiq[1]))

        cpu_interrupt(s->cpu_env, CPU_INTERRUPT_FIQ);

    else

        cpu_reset_interrupt(s->cpu_env, CPU_INTERRUPT_FIQ);

    if ((mask[0] & ~s->is_fiq[0]) || (mask[1] & ~s->is_fiq[1]))

        cpu_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);

    else

        cpu_reset_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);

}

/* Note: Here level means state of the signal on a pin, not

 * IRQ/FIQ distinction as in PXA Developer Manual.  */

static void pxa2xx_pic_set_irq(void *opaque, int irq, int level)

{

    PXA2xxPICState *s = (PXA2xxPICState *) opaque;

    int int_set = (irq >= 32);

    irq &= 31;

    if (level)

        s->int_pending[int_set] |= 1 << irq;

    else

        s->int_pending[int_set] &= ~(1 << irq);

    pxa2xx_pic_update(opaque);

}

static inline uint32_t pxa2xx_pic_highest(PXA2xxPICState *s) {

    int i, int_set, irq;

    uint32_t bit, mask[2];

    uint32_t ichp = 0x003f003f;        /* Both IDs invalid */

    mask[0] = s->int_pending[0] & s->int_enabled[0];

    mask[1] = s->int_pending[1] & s->int_enabled[1];

    for (i = PXA2XX_PIC_SRCS - 1; i >= 0; i --) {

        irq = s->priority[i] & 0x3f;

        if ((s->priority[i] & (1 << 31)) && irq < PXA2XX_PIC_SRCS) {

            /* Source peripheral ID is valid.  */

            bit = 1 << (irq & 31);

            int_set = (irq >= 32);

            if (mask[int_set] & bit & s->is_fiq[int_set]) {

                /* FIQ asserted */

                ichp &= 0xffff0000;

                ichp |= (1 << 15) | irq;

            }

            if (mask[int_set] & bit & ~s->is_fiq[int_set]) {

                /* IRQ asserted */

                ichp &= 0x0000ffff;

                ichp |= (1 << 31) | (irq << 16);

            }

        }

    }

    return ichp;

}

static uint64_t pxa2xx_pic_mem_read(void *opaque, target_phys_addr_t offset,

                                    unsigned size)

{

    PXA2xxPICState *s = (PXA2xxPICState *) opaque;

    switch (offset) {

    case ICIP:        /* IRQ Pending register */

        return s->int_pending[0] & ~s->is_fiq[0] & s->int_enabled[0];

    case ICIP2:        /* IRQ Pending register 2 */

        return s->int_pending[1] & ~s->is_fiq[1] & s->int_enabled[1];

    case ICMR:        /* Mask register */

        return s->int_enabled[0];

    case ICMR2:        /* Mask register 2 */

        return s->int_enabled[1];

    case ICLR:        /* Level register */

        return s->is_fiq[0];

    case ICLR2:        /* Level register 2 */

        return s->is_fiq[1];

    case ICCR:        /* Idle mask */

        return (s->int_idle == 0);

    case ICFP:        /* FIQ Pending register */

        return s->int_pending[0] & s->is_fiq[0] & s->int_enabled[0];

    case ICFP2:        /* FIQ Pending register 2 */

        return s->int_pending[1] & s->is_fiq[1] & s->int_enabled[1];

    case ICPR:        /* Pending register */

        return s->int_pending[0];

    case ICPR2:        /* Pending register 2 */

        return s->int_pending[1];

    case IPR0  ... IPR31:

        return s->priority[0  + ((offset - IPR0 ) >> 2)];

    case IPR32 ... IPR39:

        return s->priority[32 + ((offset - IPR32) >> 2)];

    case ICHP:        /* Highest Priority register */

        return pxa2xx_pic_highest(s);

    default:

        printf("%s: Bad register offset " REG_FMT "\n", __FUNCTION__, offset);

        return 0;

    }

}

static void pxa2xx_pic_mem_write(void *opaque, target_phys_addr_t offset,

                                 uint64_t value, unsigned size)

{

    PXA2xxPICState *s = (PXA2xxPICState *) opaque;

    switch (offset) {

    case ICMR:        /* Mask register */

        s->int_enabled[0] = value;

        break;

    case ICMR2:        /* Mask register 2 */

        s->int_enabled[1] = value;

        break;

    case ICLR:        /* Level register */

        s->is_fiq[0] = value;

        break;

    case ICLR2:        /* Level register 2 */

        s->is_fiq[1] = value;

        break;

    case ICCR:        /* Idle mask */

        s->int_idle = (value & 1) ? 0 : ~0;

        break;

    case IPR0  ... IPR31:

        s->priority[0  + ((offset - IPR0 ) >> 2)] = value & 0x8000003f;

        break;

    case IPR32 ... IPR39:

        s->priority[32 + ((offset - IPR32) >> 2)] = value & 0x8000003f;

        break;

    default:

        printf("%s: Bad register offset " REG_FMT "\n", __FUNCTION__, offset);

        return;

    }

    pxa2xx_pic_update(opaque);

}

/* Interrupt Controller Coprocessor Space Register Mapping */

static const int pxa2xx_cp_reg_map[0x10] = {

    [0x0 ... 0xf] = -1,

    [0x0] = ICIP,

    [0x1] = ICMR,

    [0x2] = ICLR,

    [0x3] = ICFP,

    [0x4] = ICPR,

    [0x5] = ICHP,

    [0x6] = ICIP2,

    [0x7] = ICMR2,

    [0x8] = ICLR2,

    [0x9] = ICFP2,

    [0xa] = ICPR2,

};

static uint32_t pxa2xx_pic_cp_read(void *opaque, int op2, int reg, int crm)

{

    target_phys_addr_t offset;

    if (pxa2xx_cp_reg_map[reg] == -1) {

        printf("%s: Bad register 0x%x\n", __FUNCTION__, reg);

        return 0;

    }

    offset = pxa2xx_cp_reg_map[reg];

    return pxa2xx_pic_mem_read(opaque, offset, 4);

}

static void pxa2xx_pic_cp_write(void *opaque, int op2, int reg, int crm,

                uint32_t value)

{

    target_phys_addr_t offset;

    if (pxa2xx_cp_reg_map[reg] == -1) {

        printf("%s: Bad register 0x%x\n", __FUNCTION__, reg);

        return;

    }

    offset = pxa2xx_cp_reg_map[reg];

    pxa2xx_pic_mem_write(opaque, offset, value, 4);

}

static const MemoryRegionOps pxa2xx_pic_ops = {

    .read = pxa2xx_pic_mem_read,

    .write = pxa2xx_pic_mem_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

};

static int pxa2xx_pic_post_load(void *opaque, int version_id)

{

    pxa2xx_pic_update(opaque);

    return 0;

}

DeviceState *pxa2xx_pic_init(target_phys_addr_t base, CPUState *env)

{

    DeviceState *dev = qdev_create(NULL, "pxa2xx_pic");

    PXA2xxPICState *s = FROM_SYSBUS(PXA2xxPICState, sysbus_from_qdev(dev));

    s->cpu_env = env;

    s->int_pending[0] = 0;

    s->int_pending[1] = 0;

    s->int_enabled[0] = 0;

    s->int_enabled[1] = 0;

    s->is_fiq[0] = 0;

    s->is_fiq[1] = 0;

    qdev_init_nofail(dev);

    qdev_init_gpio_in(dev, pxa2xx_pic_set_irq, PXA2XX_PIC_SRCS);

    /* Enable IC memory-mapped registers access.  */

    memory_region_init_io(&s->iomem, &pxa2xx_pic_ops, s,

                          "pxa2xx-pic", 0x00100000);

    sysbus_init_mmio_region(sysbus_from_qdev(dev), &s->iomem);

    sysbus_mmio_map(sysbus_from_qdev(dev), 0, base);

    /* Enable IC coprocessor access.  */

    cpu_arm_set_cp_io(env, 6, pxa2xx_pic_cp_read, pxa2xx_pic_cp_write, s);

    return dev;

}

static VMStateDescription vmstate_pxa2xx_pic_regs = {

    .name = "pxa2xx_pic",

    .version_id = 0,

    .minimum_version_id = 0,

    .minimum_version_id_old = 0,

    .post_load = pxa2xx_pic_post_load,

    .fields = (VMStateField[]) {

        VMSTATE_UINT32_ARRAY(int_enabled, PXA2xxPICState, 2),

        VMSTATE_UINT32_ARRAY(int_pending, PXA2xxPICState, 2),

        VMSTATE_UINT32_ARRAY(is_fiq, PXA2xxPICState, 2),

        VMSTATE_UINT32(int_idle, PXA2xxPICState),

        VMSTATE_UINT32_ARRAY(priority, PXA2xxPICState, PXA2XX_PIC_SRCS),

        VMSTATE_END_OF_LIST(),

    },

};

static int pxa2xx_pic_initfn(SysBusDevice *dev)

{

    return 0;

}

static SysBusDeviceInfo pxa2xx_pic_info = {

    .init       = pxa2xx_pic_initfn,

    .qdev.name  = "pxa2xx_pic",

    .qdev.desc  = "PXA2xx PIC",

    .qdev.size  = sizeof(PXA2xxPICState),

    .qdev.vmsd  = &vmstate_pxa2xx_pic_regs,

};

static void pxa2xx_pic_register(void)

{

    sysbus_register_withprop(&pxa2xx_pic_info);

}

device_init(pxa2xx_pic_register);