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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 "sysemu/sysemu.h"

#include "hw/sysbus.h"

#include "trace.h"

/*

 * 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.

 */

typedef struct MiscState {

    SysBusDevice busdev;

    MemoryRegion cfg_iomem;

    MemoryRegion diag_iomem;

    MemoryRegion mdm_iomem;

    MemoryRegion led_iomem;

    MemoryRegion sysctrl_iomem;

    MemoryRegion aux1_iomem;

    MemoryRegion aux2_iomem;

    qemu_irq irq;

    qemu_irq fdc_tc;

    uint32_t dummy;

    uint8_t config;

    uint8_t aux1, aux2;

    uint8_t diag, mctrl;

    uint8_t sysctrl;

    uint16_t leds;

} MiscState;

typedef struct APCState {

    SysBusDevice busdev;

    MemoryRegion iomem;

    qemu_irq cpu_halt;

} APCState;

#define MISC_SIZE 1

#define SYSCTRL_SIZE 4

#define AUX1_TC        0x02

#define AUX2_PWROFF    0x01

#define AUX2_PWRINTCLR 0x02

#define AUX2_PWRFAIL   0x20

#define CFG_PWRINTEN   0x08

#define SYS_RESET      0x01

#define SYS_RESETSTAT  0x02

static void slavio_misc_update_irq(void *opaque)

{

    MiscState *s = opaque;

    if ((s->aux2 & AUX2_PWRFAIL) && (s->config & CFG_PWRINTEN)) {

        trace_slavio_misc_update_irq_raise();

        qemu_irq_raise(s->irq);

    } else {

        trace_slavio_misc_update_irq_lower();

        qemu_irq_lower(s->irq);

    }

}

static void slavio_misc_reset(DeviceState *d)

{

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

    // Diagnostic and system control registers not cleared in reset

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

}

static void slavio_set_power_fail(void *opaque, int irq, int power_failing)

{

    MiscState *s = opaque;

    trace_slavio_set_power_fail(power_failing, s->config);

    if (power_failing && (s->config & CFG_PWRINTEN)) {

        s->aux2 |= AUX2_PWRFAIL;

    } else {

        s->aux2 &= ~AUX2_PWRFAIL;

    }

    slavio_misc_update_irq(s);

}

static void slavio_cfg_mem_writeb(void *opaque, hwaddr addr,

                                  uint64_t val, unsigned size)

{

    MiscState *s = opaque;

    trace_slavio_cfg_mem_writeb(val & 0xff);

    s->config = val & 0xff;

    slavio_misc_update_irq(s);

}

static uint64_t slavio_cfg_mem_readb(void *opaque, hwaddr addr,

                                     unsigned size)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    ret = s->config;

    trace_slavio_cfg_mem_readb(ret);

    return ret;

}

static const MemoryRegionOps slavio_cfg_mem_ops = {

    .read = slavio_cfg_mem_readb,

    .write = slavio_cfg_mem_writeb,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 1,

        .max_access_size = 1,

    },

};

static void slavio_diag_mem_writeb(void *opaque, hwaddr addr,

                                   uint64_t val, unsigned size)

{

    MiscState *s = opaque;

    trace_slavio_diag_mem_writeb(val & 0xff);

    s->diag = val & 0xff;

}

static uint64_t slavio_diag_mem_readb(void *opaque, hwaddr addr,

                                      unsigned size)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    ret = s->diag;

    trace_slavio_diag_mem_readb(ret);

    return ret;

}

static const MemoryRegionOps slavio_diag_mem_ops = {

    .read = slavio_diag_mem_readb,

    .write = slavio_diag_mem_writeb,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 1,

        .max_access_size = 1,

    },

};

static void slavio_mdm_mem_writeb(void *opaque, hwaddr addr,

                                  uint64_t val, unsigned size)

{

    MiscState *s = opaque;

    trace_slavio_mdm_mem_writeb(val & 0xff);

    s->mctrl = val & 0xff;

}

static uint64_t slavio_mdm_mem_readb(void *opaque, hwaddr addr,

                                     unsigned size)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    ret = s->mctrl;

    trace_slavio_mdm_mem_readb(ret);

    return ret;

}

static const MemoryRegionOps slavio_mdm_mem_ops = {

    .read = slavio_mdm_mem_readb,

    .write = slavio_mdm_mem_writeb,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 1,

        .max_access_size = 1,

    },

};

static void slavio_aux1_mem_writeb(void *opaque, hwaddr addr,

                                   uint64_t val, unsigned size)

{

    MiscState *s = opaque;

    trace_slavio_aux1_mem_writeb(val & 0xff);

    if (val & AUX1_TC) {

        // Send a pulse to floppy terminal count line

        if (s->fdc_tc) {

            qemu_irq_raise(s->fdc_tc);

            qemu_irq_lower(s->fdc_tc);

        }

        val &= ~AUX1_TC;

    }

    s->aux1 = val & 0xff;

}

static uint64_t slavio_aux1_mem_readb(void *opaque, hwaddr addr,

                                      unsigned size)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    ret = s->aux1;

    trace_slavio_aux1_mem_readb(ret);

    return ret;

}

static const MemoryRegionOps slavio_aux1_mem_ops = {

    .read = slavio_aux1_mem_readb,

    .write = slavio_aux1_mem_writeb,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 1,

        .max_access_size = 1,

    },

};

static void slavio_aux2_mem_writeb(void *opaque, hwaddr addr,

                                   uint64_t val, unsigned size)

{

    MiscState *s = opaque;

    val &= AUX2_PWRINTCLR | AUX2_PWROFF;

    trace_slavio_aux2_mem_writeb(val & 0xff);

    val |= s->aux2 & AUX2_PWRFAIL;

    if (val & AUX2_PWRINTCLR) // Clear Power Fail int

        val &= AUX2_PWROFF;

    s->aux2 = val;

    if (val & AUX2_PWROFF)

        qemu_system_shutdown_request();

    slavio_misc_update_irq(s);

}

static uint64_t slavio_aux2_mem_readb(void *opaque, hwaddr addr,

                                      unsigned size)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    ret = s->aux2;

    trace_slavio_aux2_mem_readb(ret);

    return ret;

}

static const MemoryRegionOps slavio_aux2_mem_ops = {

    .read = slavio_aux2_mem_readb,

    .write = slavio_aux2_mem_writeb,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 1,

        .max_access_size = 1,

    },

};

static void apc_mem_writeb(void *opaque, hwaddr addr,

                           uint64_t val, unsigned size)

{

    APCState *s = opaque;

    trace_apc_mem_writeb(val & 0xff);

    qemu_irq_raise(s->cpu_halt);

}

static uint64_t apc_mem_readb(void *opaque, hwaddr addr,

                              unsigned size)

{

    uint32_t ret = 0;

    trace_apc_mem_readb(ret);

    return ret;

}

static const MemoryRegionOps apc_mem_ops = {

    .read = apc_mem_readb,

    .write = apc_mem_writeb,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 1,

        .max_access_size = 1,

    }

};

static uint64_t slavio_sysctrl_mem_readl(void *opaque, hwaddr addr,

                                         unsigned size)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    switch (addr) {

    case 0:

        ret = s->sysctrl;

        break;

    default:

        break;

    }

    trace_slavio_sysctrl_mem_readl(ret);

    return ret;

}

static void slavio_sysctrl_mem_writel(void *opaque, hwaddr addr,

                                      uint64_t val, unsigned size)

{

    MiscState *s = opaque;

    trace_slavio_sysctrl_mem_writel(val);

    switch (addr) {

    case 0:

        if (val & SYS_RESET) {

            s->sysctrl = SYS_RESETSTAT;

            qemu_system_reset_request();

        }

        break;

    default:

        break;

    }

}

static const MemoryRegionOps slavio_sysctrl_mem_ops = {

    .read = slavio_sysctrl_mem_readl,

    .write = slavio_sysctrl_mem_writel,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 4,

        .max_access_size = 4,

    },

};

static uint64_t slavio_led_mem_readw(void *opaque, hwaddr addr,

                                     unsigned size)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    switch (addr) {

    case 0:

        ret = s->leds;

        break;

    default:

        break;

    }

    trace_slavio_led_mem_readw(ret);

    return ret;

}

static void slavio_led_mem_writew(void *opaque, hwaddr addr,

                                  uint64_t val, unsigned size)

{

    MiscState *s = opaque;

    trace_slavio_led_mem_readw(val & 0xffff);

    switch (addr) {

    case 0:

        s->leds = val;

        break;

    default:

        break;

    }

}

static const MemoryRegionOps slavio_led_mem_ops = {

    .read = slavio_led_mem_readw,

    .write = slavio_led_mem_writew,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 2,

        .max_access_size = 2,

    },

};

static const VMStateDescription vmstate_misc = {

    .name ="slavio_misc",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields      = (VMStateField []) {

        VMSTATE_UINT32(dummy, MiscState),

        VMSTATE_UINT8(config, MiscState),

        VMSTATE_UINT8(aux1, MiscState),

        VMSTATE_UINT8(aux2, MiscState),

        VMSTATE_UINT8(diag, MiscState),

        VMSTATE_UINT8(mctrl, MiscState),

        VMSTATE_UINT8(sysctrl, MiscState),

        VMSTATE_END_OF_LIST()

    }

};

static int apc_init1(SysBusDevice *dev)

{

    APCState *s = FROM_SYSBUS(APCState, dev);

    sysbus_init_irq(dev, &s->cpu_halt);

    /* Power management (APC) XXX: not a Slavio device */

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

                          "apc", MISC_SIZE);

    sysbus_init_mmio(dev, &s->iomem);

    return 0;

}

static int slavio_misc_init1(SysBusDevice *dev)

{

    MiscState *s = FROM_SYSBUS(MiscState, dev);

    sysbus_init_irq(dev, &s->irq);

    sysbus_init_irq(dev, &s->fdc_tc);

    /* 8 bit registers */

    /* Slavio control */

    memory_region_init_io(&s->cfg_iomem, &slavio_cfg_mem_ops, s,

                          "configuration", MISC_SIZE);

    sysbus_init_mmio(dev, &s->cfg_iomem);

    /* Diagnostics */

    memory_region_init_io(&s->diag_iomem, &slavio_diag_mem_ops, s,

                          "diagnostic", MISC_SIZE);

    sysbus_init_mmio(dev, &s->diag_iomem);

    /* Modem control */

    memory_region_init_io(&s->mdm_iomem, &slavio_mdm_mem_ops, s,

                          "modem", MISC_SIZE);

    sysbus_init_mmio(dev, &s->mdm_iomem);

    /* 16 bit registers */

    /* ss600mp diag LEDs */

    memory_region_init_io(&s->led_iomem, &slavio_led_mem_ops, s,

                          "leds", MISC_SIZE);

    sysbus_init_mmio(dev, &s->led_iomem);

    /* 32 bit registers */

    /* System control */

    memory_region_init_io(&s->sysctrl_iomem, &slavio_sysctrl_mem_ops, s,

                          "system-control", MISC_SIZE);

    sysbus_init_mmio(dev, &s->sysctrl_iomem);

    /* AUX 1 (Misc System Functions) */

    memory_region_init_io(&s->aux1_iomem, &slavio_aux1_mem_ops, s,

                          "misc-system-functions", MISC_SIZE);

    sysbus_init_mmio(dev, &s->aux1_iomem);

    /* AUX 2 (Software Powerdown Control) */

    memory_region_init_io(&s->aux2_iomem, &slavio_aux2_mem_ops, s,

                          "software-powerdown-control", MISC_SIZE);

    sysbus_init_mmio(dev, &s->aux2_iomem);

    qdev_init_gpio_in(&dev->qdev, slavio_set_power_fail, 1);

    return 0;

}

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

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = slavio_misc_init1;

    dc->reset = slavio_misc_reset;

    dc->vmsd = &vmstate_misc;

}

static const TypeInfo slavio_misc_info = {

    .name          = "slavio_misc",

    .parent        = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(MiscState),

    .class_init    = slavio_misc_class_init,

};

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

{

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = apc_init1;

}

static const TypeInfo apc_info = {

    .name          = "apc",

    .parent        = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(MiscState),

    .class_init    = apc_class_init,

};

static void slavio_misc_register_types(void)

{

    type_register_static(&slavio_misc_info);

    type_register_static(&apc_info);

}

type_init(slavio_misc_register_types)