/*

 * QEMU Sparc SBI interrupt controller emulation

 *

 * Based on slavio_intctl, 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 "hw.h"

#include "sun4m.h"

#include "console.h"

//#define DEBUG_IRQ

#ifdef DEBUG_IRQ

#define DPRINTF(fmt, args...) \

do { printf("IRQ: " fmt , ##args); } while (0)

#else

#define DPRINTF(fmt, args...)

#endif

#define MAX_CPUS 16

#define SBI_NREGS 16

typedef struct SBIState {

    uint32_t regs[SBI_NREGS];

    uint32_t intreg_pending[MAX_CPUS];

    qemu_irq *cpu_irqs[MAX_CPUS];

    uint32_t pil_out[MAX_CPUS];

} SBIState;

#define SBI_SIZE (SBI_NREGS * 4)

static void sbi_check_interrupts(void *opaque)

{

}

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

{

}

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

{

}

static uint32_t sbi_mem_readl(void *opaque, target_phys_addr_t addr)

{

    SBIState *s = opaque;

    uint32_t saddr, ret;

    saddr = addr >> 2;

    switch (saddr) {

    default:

        ret = s->regs[saddr];

        break;

    }

    DPRINTF("read system reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);

    return ret;

}

static void sbi_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)

{

    SBIState *s = opaque;

    uint32_t saddr;

    saddr = addr >> 2;

    DPRINTF("write system reg 0x" TARGET_FMT_plx " = %x\n", addr, val);

    switch (saddr) {

    default:

        s->regs[saddr] = val;

        break;

    }

}

static CPUReadMemoryFunc *sbi_mem_read[3] = {

    NULL,

    NULL,

    sbi_mem_readl,

};

static CPUWriteMemoryFunc *sbi_mem_write[3] = {

    NULL,

    NULL,

    sbi_mem_writel,

};

static void sbi_save(QEMUFile *f, void *opaque)

{

    SBIState *s = opaque;

    unsigned int i;

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

        qemu_put_be32s(f, &s->intreg_pending[i]);

    }

}

static int sbi_load(QEMUFile *f, void *opaque, int version_id)

{

    SBIState *s = opaque;

    unsigned int i;

    if (version_id != 1)

        return -EINVAL;

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

        qemu_get_be32s(f, &s->intreg_pending[i]);

    }

    sbi_check_interrupts(s);

    return 0;

}

static void sbi_reset(void *opaque)

{

    SBIState *s = opaque;

    unsigned int i;

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

        s->intreg_pending[i] = 0;

    }

    sbi_check_interrupts(s);

}

void *sbi_init(target_phys_addr_t addr, qemu_irq **irq, qemu_irq **cpu_irq,

               qemu_irq **parent_irq)

{

    unsigned int i;

    int sbi_io_memory;

    SBIState *s;

    s = qemu_mallocz(sizeof(SBIState));

    if (!s)

        return NULL;

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

        s->cpu_irqs[i] = parent_irq[i];

    }

    sbi_io_memory = cpu_register_io_memory(0, sbi_mem_read, sbi_mem_write, s);

    cpu_register_physical_memory(addr, SBI_SIZE, sbi_io_memory);

    register_savevm("sbi", addr, 1, sbi_save, sbi_load, s);

    qemu_register_reset(sbi_reset, s);

    *irq = qemu_allocate_irqs(sbi_set_irq, s, 32);

    *cpu_irq = qemu_allocate_irqs(sbi_set_timer_irq_cpu, s, MAX_CPUS);

    sbi_reset(s);

    return s;

}