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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 "sun4m.h"

#include "sysemu.h"

#include "sysbus.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, ...)                                  \

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

#else

#define MISC_DPRINTF(fmt, ...)

#endif

typedef struct MiscState {

    SysBusDevice busdev;

    qemu_irq irq;

    uint32_t dummy;

    uint8_t config;

    uint8_t aux1, aux2;

    uint8_t diag, mctrl;

    uint8_t sysctrl;

    uint16_t leds;

    qemu_irq fdc_tc;

} MiscState;

typedef struct APCState {

    SysBusDevice busdev;

    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)) {

        MISC_DPRINTF("Raise IRQ\n");

        qemu_irq_raise(s->irq);

    } else {

        MISC_DPRINTF("Lower IRQ\n");

        qemu_irq_lower(s->irq);

    }

}

static void slavio_misc_reset(void *opaque)

{

    MiscState *s = opaque;

    // 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;

    MISC_DPRINTF("Power fail: %d, config: %d\n", 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, target_phys_addr_t addr,

                                  uint32_t val)

{

    MiscState *s = opaque;

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

    s->config = val & 0xff;

    slavio_misc_update_irq(s);

}

static uint32_t slavio_cfg_mem_readb(void *opaque, target_phys_addr_t addr)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    ret = s->config;

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

    return ret;

}

static CPUReadMemoryFunc * const slavio_cfg_mem_read[3] = {

    slavio_cfg_mem_readb,

    NULL,

    NULL,

};

static CPUWriteMemoryFunc * const slavio_cfg_mem_write[3] = {

    slavio_cfg_mem_writeb,

    NULL,

    NULL,

};

static void slavio_diag_mem_writeb(void *opaque, target_phys_addr_t addr,

                                   uint32_t val)

{

    MiscState *s = opaque;

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

    s->diag = val & 0xff;

}

static uint32_t slavio_diag_mem_readb(void *opaque, target_phys_addr_t addr)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    ret = s->diag;

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

    return ret;

}

static CPUReadMemoryFunc * const slavio_diag_mem_read[3] = {

    slavio_diag_mem_readb,

    NULL,

    NULL,

};

static CPUWriteMemoryFunc * const slavio_diag_mem_write[3] = {

    slavio_diag_mem_writeb,

    NULL,

    NULL,

};

static void slavio_mdm_mem_writeb(void *opaque, target_phys_addr_t addr,

                                  uint32_t val)

{

    MiscState *s = opaque;

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

    s->mctrl = val & 0xff;

}

static uint32_t slavio_mdm_mem_readb(void *opaque, target_phys_addr_t addr)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    ret = s->mctrl;

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

    return ret;

}

static CPUReadMemoryFunc * const slavio_mdm_mem_read[3] = {

    slavio_mdm_mem_readb,

    NULL,

    NULL,

};

static CPUWriteMemoryFunc * const slavio_mdm_mem_write[3] = {

    slavio_mdm_mem_writeb,

    NULL,

    NULL,

};

static void slavio_aux1_mem_writeb(void *opaque, target_phys_addr_t addr,

                                   uint32_t val)

{

    MiscState *s = opaque;

    MISC_DPRINTF("Write aux1 %2.2x\n", 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 uint32_t slavio_aux1_mem_readb(void *opaque, target_phys_addr_t addr)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    ret = s->aux1;

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

    return ret;

}

static CPUReadMemoryFunc * const slavio_aux1_mem_read[3] = {

    slavio_aux1_mem_readb,

    NULL,

    NULL,

};

static CPUWriteMemoryFunc * const slavio_aux1_mem_write[3] = {

    slavio_aux1_mem_writeb,

    NULL,

    NULL,

};

static void slavio_aux2_mem_writeb(void *opaque, target_phys_addr_t addr,

                                   uint32_t val)

{

    MiscState *s = opaque;

    val &= AUX2_PWRINTCLR | AUX2_PWROFF;

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

    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 uint32_t slavio_aux2_mem_readb(void *opaque, target_phys_addr_t addr)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    ret = s->aux2;

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

    return ret;

}

static CPUReadMemoryFunc * const slavio_aux2_mem_read[3] = {

    slavio_aux2_mem_readb,

    NULL,

    NULL,

};

static CPUWriteMemoryFunc * const slavio_aux2_mem_write[3] = {

    slavio_aux2_mem_writeb,

    NULL,

    NULL,

};

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

{

    APCState *s = opaque;

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

    qemu_irq_raise(s->cpu_halt);

}

static uint32_t apc_mem_readb(void *opaque, target_phys_addr_t addr)

{

    uint32_t ret = 0;

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

    return ret;

}

static CPUReadMemoryFunc * const apc_mem_read[3] = {

    apc_mem_readb,

    NULL,

    NULL,

};

static CPUWriteMemoryFunc * const apc_mem_write[3] = {

    apc_mem_writeb,

    NULL,

    NULL,

};

static uint32_t slavio_sysctrl_mem_readl(void *opaque, target_phys_addr_t addr)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    switch (addr) {

    case 0:

        ret = s->sysctrl;

        break;

    default:

        break;

    }

    MISC_DPRINTF("Read system control %08x\n", ret);

    return ret;

}

static void slavio_sysctrl_mem_writel(void *opaque, target_phys_addr_t addr,

                                      uint32_t val)

{

    MiscState *s = opaque;

    MISC_DPRINTF("Write system control %08x\n", val);

    switch (addr) {

    case 0:

        if (val & SYS_RESET) {

            s->sysctrl = SYS_RESETSTAT;

            qemu_system_reset_request();

        }

        break;

    default:

        break;

    }

}

static CPUReadMemoryFunc * const slavio_sysctrl_mem_read[3] = {

    NULL,

    NULL,

    slavio_sysctrl_mem_readl,

};

static CPUWriteMemoryFunc * const slavio_sysctrl_mem_write[3] = {

    NULL,

    NULL,

    slavio_sysctrl_mem_writel,

};

static uint32_t slavio_led_mem_readw(void *opaque, target_phys_addr_t addr)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    switch (addr) {

    case 0:

        ret = s->leds;

        break;

    default:

        break;

    }

    MISC_DPRINTF("Read diagnostic LED %04x\n", ret);

    return ret;

}

static void slavio_led_mem_writew(void *opaque, target_phys_addr_t addr,

                                  uint32_t val)

{

    MiscState *s = opaque;

    MISC_DPRINTF("Write diagnostic LED %04x\n", val & 0xffff);

    switch (addr) {

    case 0:

        s->leds = val;

        break;

    default:

        break;

    }

}

static CPUReadMemoryFunc * const slavio_led_mem_read[3] = {

    NULL,

    slavio_led_mem_readw,

    NULL,

};

static CPUWriteMemoryFunc * const slavio_led_mem_write[3] = {

    NULL,

    slavio_led_mem_writew,

    NULL,

};

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);

    int io;

    sysbus_init_irq(dev, &s->cpu_halt);

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

    io = cpu_register_io_memory(apc_mem_read, apc_mem_write, s);

    sysbus_init_mmio(dev, MISC_SIZE, io);

    return 0;

}

static int slavio_misc_init1(SysBusDevice *dev)

{

    MiscState *s = FROM_SYSBUS(MiscState, dev);

    int io;

    sysbus_init_irq(dev, &s->irq);

    sysbus_init_irq(dev, &s->fdc_tc);

    /* 8 bit registers */

    /* Slavio control */

    io = cpu_register_io_memory(slavio_cfg_mem_read,

                                slavio_cfg_mem_write, s);

    sysbus_init_mmio(dev, MISC_SIZE, io);

    /* Diagnostics */

    io = cpu_register_io_memory(slavio_diag_mem_read,

                                slavio_diag_mem_write, s);

    sysbus_init_mmio(dev, MISC_SIZE, io);

    /* Modem control */

    io = cpu_register_io_memory(slavio_mdm_mem_read,

                                slavio_mdm_mem_write, s);

    sysbus_init_mmio(dev, MISC_SIZE, io);

    /* 16 bit registers */

    /* ss600mp diag LEDs */

    io = cpu_register_io_memory(slavio_led_mem_read,

                                slavio_led_mem_write, s);

    sysbus_init_mmio(dev, MISC_SIZE, io);

    /* 32 bit registers */

    /* System control */

    io = cpu_register_io_memory(slavio_sysctrl_mem_read,

                                slavio_sysctrl_mem_write, s);

    sysbus_init_mmio(dev, SYSCTRL_SIZE, io);

    /* AUX 1 (Misc System Functions) */

    io = cpu_register_io_memory(slavio_aux1_mem_read,

                                slavio_aux1_mem_write, s);

    sysbus_init_mmio(dev, MISC_SIZE, io);

    /* AUX 2 (Software Powerdown Control) */

    io = cpu_register_io_memory(slavio_aux2_mem_read,

                                slavio_aux2_mem_write, s);

    sysbus_init_mmio(dev, MISC_SIZE, io);

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

    vmstate_register(-1, &vmstate_misc, s);

    qemu_register_reset(slavio_misc_reset, s);

    slavio_misc_reset(s);

    return 0;

}

static SysBusDeviceInfo slavio_misc_info = {

    .init = slavio_misc_init1,

    .qdev.name  = "slavio_misc",

    .qdev.size  = sizeof(MiscState),

};

static SysBusDeviceInfo apc_info = {

    .init = apc_init1,

    .qdev.name  = "apc",

    .qdev.size  = sizeof(MiscState),

};

static void slavio_misc_register_devices(void)

{

    sysbus_register_withprop(&slavio_misc_info);

    sysbus_register_withprop(&apc_info);

}

device_init(slavio_misc_register_devices)