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/*

 * QEMU Sparc SLAVIO interrupt controller emulation

 *

 * Copyright (c) 2003-2005 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "sun4m.h"

#include "monitor.h"

#include "sysbus.h"

#include "trace.h"

//#define DEBUG_IRQ_COUNT

/*

 * Registers of interrupt controller in sun4m.

 *

 * This is the interrupt controller part of chip STP2001 (Slave I/O), also

 * produced as NCR89C105. See

 * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C105.txt

 *

 * There is a system master controller and one for each cpu.

 *

 */

#define MAX_CPUS 16

#define MAX_PILS 16

struct SLAVIO_INTCTLState;

typedef struct SLAVIO_CPUINTCTLState {

    MemoryRegion iomem;

    struct SLAVIO_INTCTLState *master;

    uint32_t intreg_pending;

    uint32_t cpu;

    uint32_t irl_out;

} SLAVIO_CPUINTCTLState;

typedef struct SLAVIO_INTCTLState {

    SysBusDevice busdev;

    MemoryRegion iomem;

#ifdef DEBUG_IRQ_COUNT

    uint64_t irq_count[32];

#endif

    qemu_irq cpu_irqs[MAX_CPUS][MAX_PILS];

    SLAVIO_CPUINTCTLState slaves[MAX_CPUS];

    uint32_t intregm_pending;

    uint32_t intregm_disabled;

    uint32_t target_cpu;

} SLAVIO_INTCTLState;

#define INTCTL_MAXADDR 0xf

#define INTCTL_SIZE (INTCTL_MAXADDR + 1)

#define INTCTLM_SIZE 0x14

#define MASTER_IRQ_MASK ~0x0fa2007f

#define MASTER_DISABLE 0x80000000

#define CPU_SOFTIRQ_MASK 0xfffe0000

#define CPU_IRQ_INT15_IN (1 << 15)

#define CPU_IRQ_TIMER_IN (1 << 14)

static void slavio_check_interrupts(SLAVIO_INTCTLState *s, int set_irqs);

// per-cpu interrupt controller

static uint64_t slavio_intctl_mem_readl(void *opaque, hwaddr addr,

                                        unsigned size)

{

    SLAVIO_CPUINTCTLState *s = opaque;

    uint32_t saddr, ret;

    saddr = addr >> 2;

    switch (saddr) {

    case 0:

        ret = s->intreg_pending;

        break;

    default:

        ret = 0;

        break;

    }

    trace_slavio_intctl_mem_readl(s->cpu, addr, ret);

    return ret;

}

static void slavio_intctl_mem_writel(void *opaque, hwaddr addr,

                                     uint64_t val, unsigned size)

{

    SLAVIO_CPUINTCTLState *s = opaque;

    uint32_t saddr;

    saddr = addr >> 2;

    trace_slavio_intctl_mem_writel(s->cpu, addr, val);

    switch (saddr) {

    case 1: // clear pending softints

        val &= CPU_SOFTIRQ_MASK | CPU_IRQ_INT15_IN;

        s->intreg_pending &= ~val;

        slavio_check_interrupts(s->master, 1);

        trace_slavio_intctl_mem_writel_clear(s->cpu, val, s->intreg_pending);

        break;

    case 2: // set softint

        val &= CPU_SOFTIRQ_MASK;

        s->intreg_pending |= val;

        slavio_check_interrupts(s->master, 1);

        trace_slavio_intctl_mem_writel_set(s->cpu, val, s->intreg_pending);

        break;

    default:

        break;

    }

}

static const MemoryRegionOps slavio_intctl_mem_ops = {

    .read = slavio_intctl_mem_readl,

    .write = slavio_intctl_mem_writel,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 4,

        .max_access_size = 4,

    },

};

// master system interrupt controller

static uint64_t slavio_intctlm_mem_readl(void *opaque, hwaddr addr,

                                         unsigned size)

{

    SLAVIO_INTCTLState *s = opaque;

    uint32_t saddr, ret;

    saddr = addr >> 2;

    switch (saddr) {

    case 0:

        ret = s->intregm_pending & ~MASTER_DISABLE;

        break;

    case 1:

        ret = s->intregm_disabled & MASTER_IRQ_MASK;

        break;

    case 4:

        ret = s->target_cpu;

        break;

    default:

        ret = 0;

        break;

    }

    trace_slavio_intctlm_mem_readl(addr, ret);

    return ret;

}

static void slavio_intctlm_mem_writel(void *opaque, hwaddr addr,

                                      uint64_t val, unsigned size)

{

    SLAVIO_INTCTLState *s = opaque;

    uint32_t saddr;

    saddr = addr >> 2;

    trace_slavio_intctlm_mem_writel(addr, val);

    switch (saddr) {

    case 2: // clear (enable)

        // Force clear unused bits

        val &= MASTER_IRQ_MASK;

        s->intregm_disabled &= ~val;

        trace_slavio_intctlm_mem_writel_enable(val, s->intregm_disabled);

        slavio_check_interrupts(s, 1);

        break;

    case 3: // set (disable; doesn't affect pending)

        // Force clear unused bits

        val &= MASTER_IRQ_MASK;

        s->intregm_disabled |= val;

        slavio_check_interrupts(s, 1);

        trace_slavio_intctlm_mem_writel_disable(val, s->intregm_disabled);

        break;

    case 4:

        s->target_cpu = val & (MAX_CPUS - 1);

        slavio_check_interrupts(s, 1);

        trace_slavio_intctlm_mem_writel_target(s->target_cpu);

        break;

    default:

        break;

    }

}

static const MemoryRegionOps slavio_intctlm_mem_ops = {

    .read = slavio_intctlm_mem_readl,

    .write = slavio_intctlm_mem_writel,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 4,

        .max_access_size = 4,

    },

};

void slavio_pic_info(Monitor *mon, DeviceState *dev)

{

    SysBusDevice *sd;

    SLAVIO_INTCTLState *s;

    int i;

    sd = sysbus_from_qdev(dev);

    s = FROM_SYSBUS(SLAVIO_INTCTLState, sd);

    for (i = 0; i < MAX_CPUS; i++) {

        monitor_printf(mon, "per-cpu %d: pending 0x%08x\n", i,

                       s->slaves[i].intreg_pending);

    }

    monitor_printf(mon, "master: pending 0x%08x, disabled 0x%08x\n",

                   s->intregm_pending, s->intregm_disabled);

}

void slavio_irq_info(Monitor *mon, DeviceState *dev)

{

#ifndef DEBUG_IRQ_COUNT

    monitor_printf(mon, "irq statistic code not compiled.\n");

#else

    SysBusDevice *sd;

    SLAVIO_INTCTLState *s;

    int i;

    int64_t count;

    sd = sysbus_from_qdev(dev);

    s = FROM_SYSBUS(SLAVIO_INTCTLState, sd);

    monitor_printf(mon, "IRQ statistics:\n");

    for (i = 0; i < 32; i++) {

        count = s->irq_count[i];

        if (count > 0)

            monitor_printf(mon, "%2d: %" PRId64 "\n", i, count);

    }

#endif

}

static const uint32_t intbit_to_level[] = {

    2, 3, 5, 7, 9, 11, 13, 2,   3, 5, 7, 9, 11, 13, 12, 12,

    6, 13, 4, 10, 8, 9, 11, 0,  0, 0, 0, 15, 15, 15, 15, 0,

};

static void slavio_check_interrupts(SLAVIO_INTCTLState *s, int set_irqs)

{

    uint32_t pending = s->intregm_pending, pil_pending;

    unsigned int i, j;

    pending &= ~s->intregm_disabled;

    trace_slavio_check_interrupts(pending, s->intregm_disabled);

    for (i = 0; i < MAX_CPUS; i++) {

        pil_pending = 0;

        /* If we are the current interrupt target, get hard interrupts */

        if (pending && !(s->intregm_disabled & MASTER_DISABLE) &&

            (i == s->target_cpu)) {

            for (j = 0; j < 32; j++) {

                if ((pending & (1 << j)) && intbit_to_level[j]) {

                    pil_pending |= 1 << intbit_to_level[j];

                }

            }

        }

        /* Calculate current pending hard interrupts for display */

        s->slaves[i].intreg_pending &= CPU_SOFTIRQ_MASK | CPU_IRQ_INT15_IN |

            CPU_IRQ_TIMER_IN;

        if (i == s->target_cpu) {

            for (j = 0; j < 32; j++) {

                if ((s->intregm_pending & (1 << j)) && intbit_to_level[j]) {

                    s->slaves[i].intreg_pending |= 1 << intbit_to_level[j];

                }

            }

        }

        /* Level 15 and CPU timer interrupts are only masked when

           the MASTER_DISABLE bit is set */

        if (!(s->intregm_disabled & MASTER_DISABLE)) {

            pil_pending |= s->slaves[i].intreg_pending &

                (CPU_IRQ_INT15_IN | CPU_IRQ_TIMER_IN);

        }

        /* Add soft interrupts */

        pil_pending |= (s->slaves[i].intreg_pending & CPU_SOFTIRQ_MASK) >> 16;

        if (set_irqs) {

            /* Since there is not really an interrupt 0 (and pil_pending

             * and irl_out bit zero are thus always zero) there is no need

             * to do anything with cpu_irqs[i][0] and it is OK not to do

             * the j=0 iteration of this loop.

             */

            for (j = MAX_PILS-1; j > 0; j--) {

                if (pil_pending & (1 << j)) {

                    if (!(s->slaves[i].irl_out & (1 << j))) {

                        qemu_irq_raise(s->cpu_irqs[i][j]);

                    }

                } else {

                    if (s->slaves[i].irl_out & (1 << j)) {

                        qemu_irq_lower(s->cpu_irqs[i][j]);

                    }

                }

            }

        }

        s->slaves[i].irl_out = pil_pending;

    }

}

/*

 * "irq" here is the bit number in the system interrupt register to

 * separate serial and keyboard interrupts sharing a level.

 */

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

{

    SLAVIO_INTCTLState *s = opaque;

    uint32_t mask = 1 << irq;

    uint32_t pil = intbit_to_level[irq];

    unsigned int i;

    trace_slavio_set_irq(s->target_cpu, irq, pil, level);

    if (pil > 0) {

        if (level) {

#ifdef DEBUG_IRQ_COUNT

            s->irq_count[pil]++;

#endif

            s->intregm_pending |= mask;

            if (pil == 15) {

                for (i = 0; i < MAX_CPUS; i++) {

                    s->slaves[i].intreg_pending |= 1 << pil;

                }

            }

        } else {

            s->intregm_pending &= ~mask;

            if (pil == 15) {

                for (i = 0; i < MAX_CPUS; i++) {

                    s->slaves[i].intreg_pending &= ~(1 << pil);

                }

            }

        }

        slavio_check_interrupts(s, 1);

    }

}

static void slavio_set_timer_irq_cpu(void *opaque, int cpu, int level)

{

    SLAVIO_INTCTLState *s = opaque;

    trace_slavio_set_timer_irq_cpu(cpu, level);

    if (level) {

        s->slaves[cpu].intreg_pending |= CPU_IRQ_TIMER_IN;

    } else {

        s->slaves[cpu].intreg_pending &= ~CPU_IRQ_TIMER_IN;

    }

    slavio_check_interrupts(s, 1);

}

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

{

    if (irq < 32) {

        slavio_set_irq(opaque, irq, level);

    } else {

        slavio_set_timer_irq_cpu(opaque, irq - 32, level);

    }

}

static int vmstate_intctl_post_load(void *opaque, int version_id)

{

    SLAVIO_INTCTLState *s = opaque;

    slavio_check_interrupts(s, 0);

    return 0;

}

static const VMStateDescription vmstate_intctl_cpu = {

    .name ="slavio_intctl_cpu",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields      = (VMStateField []) {

        VMSTATE_UINT32(intreg_pending, SLAVIO_CPUINTCTLState),

        VMSTATE_END_OF_LIST()

    }

};

static const VMStateDescription vmstate_intctl = {

    .name ="slavio_intctl",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .post_load = vmstate_intctl_post_load,

    .fields      = (VMStateField []) {

        VMSTATE_STRUCT_ARRAY(slaves, SLAVIO_INTCTLState, MAX_CPUS, 1,

                             vmstate_intctl_cpu, SLAVIO_CPUINTCTLState),

        VMSTATE_UINT32(intregm_pending, SLAVIO_INTCTLState),

        VMSTATE_UINT32(intregm_disabled, SLAVIO_INTCTLState),

        VMSTATE_UINT32(target_cpu, SLAVIO_INTCTLState),

        VMSTATE_END_OF_LIST()

    }

};

static void slavio_intctl_reset(DeviceState *d)

{

    SLAVIO_INTCTLState *s = container_of(d, SLAVIO_INTCTLState, busdev.qdev);

    int i;

    for (i = 0; i < MAX_CPUS; i++) {

        s->slaves[i].intreg_pending = 0;

        s->slaves[i].irl_out = 0;

    }

    s->intregm_disabled = ~MASTER_IRQ_MASK;

    s->intregm_pending = 0;

    s->target_cpu = 0;

    slavio_check_interrupts(s, 0);

}

static int slavio_intctl_init1(SysBusDevice *dev)

{

    SLAVIO_INTCTLState *s = FROM_SYSBUS(SLAVIO_INTCTLState, dev);

    unsigned int i, j;

    char slave_name[45];

    qdev_init_gpio_in(&dev->qdev, slavio_set_irq_all, 32 + MAX_CPUS);

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

                          "master-interrupt-controller", INTCTLM_SIZE);

    sysbus_init_mmio(dev, &s->iomem);

    for (i = 0; i < MAX_CPUS; i++) {

        snprintf(slave_name, sizeof(slave_name),

                 "slave-interrupt-controller-%i", i);

        for (j = 0; j < MAX_PILS; j++) {

            sysbus_init_irq(dev, &s->cpu_irqs[i][j]);

        }

        memory_region_init_io(&s->slaves[i].iomem, &slavio_intctl_mem_ops,

                              &s->slaves[i], slave_name, INTCTL_SIZE);

        sysbus_init_mmio(dev, &s->slaves[i].iomem);

        s->slaves[i].cpu = i;

        s->slaves[i].master = s;

    }

    return 0;

}

static void slavio_intctl_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = slavio_intctl_init1;

    dc->reset = slavio_intctl_reset;

    dc->vmsd = &vmstate_intctl;

}

static TypeInfo slavio_intctl_info = {

    .name          = "slavio_intctl",

    .parent        = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(SLAVIO_INTCTLState),

    .class_init    = slavio_intctl_class_init,

};

static void slavio_intctl_register_types(void)

{

    type_register_static(&slavio_intctl_info);

}

type_init(slavio_intctl_register_types)