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/*

 * QEMU Sparc SLAVIO aux io port emulation

 * 

 * Copyright (c) 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 "vl.h"

/* debug misc */

//#define DEBUG_MISC

/*

 * This is the auxio port, chip control and system control 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

 *

 * This also includes the PMC CPU idle controller.

 */

#ifdef DEBUG_MISC

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

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

#else

#define MISC_DPRINTF(fmt, args...)

#endif

typedef struct MiscState {

    int irq;

    uint8_t config;

    uint8_t aux1, aux2;

    uint8_t diag, mctrl;

} MiscState;

#define MISC_MAXADDR 1

static void slavio_misc_update_irq(void *opaque)

{

    MiscState *s = opaque;

    if ((s->aux2 & 0x4) && (s->config & 0x8)) {

        pic_set_irq(s->irq, 1);

    } else {

        pic_set_irq(s->irq, 0);

    }

}

static void slavio_misc_reset(void *opaque)

{

    MiscState *s = opaque;

    // Diagnostic register not cleared in reset

    s->config = s->aux1 = s->aux2 = s->mctrl = 0;

}

void slavio_set_power_fail(void *opaque, int power_failing)

{

    MiscState *s = opaque;

    MISC_DPRINTF("Power fail: %d, config: %d\n", power_failing, s->config);

    if (power_failing && (s->config & 0x8)) {

        s->aux2 |= 0x4;

    } else {

        s->aux2 &= ~0x4;

    }

    slavio_misc_update_irq(s);

}

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

{

    MiscState *s = opaque;

    switch (addr & 0xfff0000) {

    case 0x1800000:

        MISC_DPRINTF("Write config %2.2x\n", val & 0xff);

        s->config = val & 0xff;

        slavio_misc_update_irq(s);

        break;

    case 0x1900000:

        MISC_DPRINTF("Write aux1 %2.2x\n", val & 0xff);

        s->aux1 = val & 0xff;

        break;

    case 0x1910000:

        val &= 0x3;

        MISC_DPRINTF("Write aux2 %2.2x\n", val);

        val |= s->aux2 & 0x4;

        if (val & 0x2) // Clear Power Fail int

            val &= 0x1;

        s->aux2 = val;

        if (val & 1)

            qemu_system_shutdown_request();

        slavio_misc_update_irq(s);

        break;

    case 0x1a00000:

        MISC_DPRINTF("Write diag %2.2x\n", val & 0xff);

        s->diag = val & 0xff;

        break;

    case 0x1b00000:

        MISC_DPRINTF("Write modem control %2.2x\n", val & 0xff);

        s->mctrl = val & 0xff;

        break;

    case 0x1f00000:

        MISC_DPRINTF("Write system control %2.2x\n", val & 0xff);

        if (val & 1)

            qemu_system_reset_request();

        break;

    case 0xa000000:

        MISC_DPRINTF("Write power management %2.2x\n", val & 0xff);

#if 0

        // XXX: halting CPU does not work

        raise_exception(EXCP_HLT);

        cpu_loop_exit();

#endif

        break;

    }

}

static uint32_t slavio_misc_mem_readb(void *opaque, target_phys_addr_t addr)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    switch (addr & 0xfff0000) {

    case 0x1800000:

        ret = s->config;

        MISC_DPRINTF("Read config %2.2x\n", ret);

        break;

    case 0x1900000:

        ret = s->aux1;

        MISC_DPRINTF("Read aux1 %2.2x\n", ret);

        break;

    case 0x1910000:

        ret = s->aux2;

        MISC_DPRINTF("Read aux2 %2.2x\n", ret);

        break;

    case 0x1a00000:

        ret = s->diag;

        MISC_DPRINTF("Read diag %2.2x\n", ret);

        break;

    case 0x1b00000:

        ret = s->mctrl;

        MISC_DPRINTF("Read modem control %2.2x\n", ret);

        break;

    case 0x1f00000:

        MISC_DPRINTF("Read system control %2.2x\n", ret);

        break;

    case 0xa000000:

        MISC_DPRINTF("Read power management %2.2x\n", ret);

        break;

    }

    return ret;

}

static CPUReadMemoryFunc *slavio_misc_mem_read[3] = {

    slavio_misc_mem_readb,

    slavio_misc_mem_readb,

    slavio_misc_mem_readb,

};

static CPUWriteMemoryFunc *slavio_misc_mem_write[3] = {

    slavio_misc_mem_writeb,

    slavio_misc_mem_writeb,

    slavio_misc_mem_writeb,

};

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

{

    MiscState *s = opaque;

    qemu_put_be32s(f, &s->irq);

    qemu_put_8s(f, &s->config);

    qemu_put_8s(f, &s->aux1);

    qemu_put_8s(f, &s->aux2);

    qemu_put_8s(f, &s->diag);

    qemu_put_8s(f, &s->mctrl);

}

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

{

    MiscState *s = opaque;

    if (version_id != 1)

        return -EINVAL;

    qemu_get_be32s(f, &s->irq);

    qemu_get_8s(f, &s->config);

    qemu_get_8s(f, &s->aux1);

    qemu_get_8s(f, &s->aux2);

    qemu_get_8s(f, &s->diag);

    qemu_get_8s(f, &s->mctrl);

    return 0;

}

void *slavio_misc_init(uint32_t base, int irq)

{

    int slavio_misc_io_memory;

    MiscState *s;

    s = qemu_mallocz(sizeof(MiscState));

    if (!s)

        return NULL;

    slavio_misc_io_memory = cpu_register_io_memory(0, slavio_misc_mem_read, slavio_misc_mem_write, s);

    // Slavio control

    cpu_register_physical_memory(base + 0x1800000, MISC_MAXADDR, slavio_misc_io_memory);

    // AUX 1

    cpu_register_physical_memory(base + 0x1900000, MISC_MAXADDR, slavio_misc_io_memory);

    // AUX 2

    cpu_register_physical_memory(base + 0x1910000, MISC_MAXADDR, slavio_misc_io_memory);

    // Diagnostics

    cpu_register_physical_memory(base + 0x1a00000, MISC_MAXADDR, slavio_misc_io_memory);

    // Modem control

    cpu_register_physical_memory(base + 0x1b00000, MISC_MAXADDR, slavio_misc_io_memory);

    // System control

    cpu_register_physical_memory(base + 0x1f00000, MISC_MAXADDR, slavio_misc_io_memory);

    // Power management

    cpu_register_physical_memory(base + 0xa000000, MISC_MAXADDR, slavio_misc_io_memory);

    s->irq = irq;

    register_savevm("slavio_misc", base, 1, slavio_misc_save, slavio_misc_load, s);

    qemu_register_reset(slavio_misc_reset, s);

    slavio_misc_reset(s);

    return s;

}