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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 "hw.h"

#include "sun4m.h"

#include "sysemu.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 {

    qemu_irq irq;

    uint8_t config;

    uint8_t aux1, aux2;

    uint8_t diag, mctrl;

    uint32_t sysctrl;

    uint16_t leds;

    CPUState *env;

    qemu_irq fdc_tc;

} MiscState;

#define MISC_SIZE 1

#define SYSCTRL_MAXADDR 3

#define SYSCTRL_SIZE (SYSCTRL_MAXADDR + 1)

#define LED_MAXADDR 1

#define LED_SIZE (LED_MAXADDR + 1)

#define MISC_MASK 0x0fff0000

#define MISC_LEDS 0x01600000

#define MISC_CFG  0x01800000

#define MISC_DIAG 0x01a00000

#define MISC_MDM  0x01b00000

#define MISC_SYS  0x01f00000

#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;

}

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 & CFG_PWRINTEN)) {

        s->aux2 |= AUX2_PWRFAIL;

    } else {

        s->aux2 &= ~AUX2_PWRFAIL;

    }

    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 & MISC_MASK) {

    case MISC_CFG:

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

        s->config = val & 0xff;

        slavio_misc_update_irq(s);

        break;

    case MISC_DIAG:

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

        s->diag = val & 0xff;

        break;

    case MISC_MDM:

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

        s->mctrl = val & 0xff;

        break;

    default:

        break;

    }

}

static uint32_t slavio_misc_mem_readb(void *opaque, target_phys_addr_t addr)

{

    MiscState *s = opaque;

    uint32_t ret = 0;

    switch (addr & MISC_MASK) {

    case MISC_CFG:

        ret = s->config;

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

        break;

    case MISC_DIAG:

        ret = s->diag;

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

        break;

    case MISC_MDM:

        ret = s->mctrl;

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

        break;

    default:

        break;

    }

    return ret;

}

static CPUReadMemoryFunc *slavio_misc_mem_read[3] = {

    slavio_misc_mem_readb,

    NULL,

    NULL,

};

static CPUWriteMemoryFunc *slavio_misc_mem_write[3] = {

    slavio_misc_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 *slavio_aux1_mem_read[3] = {

    slavio_aux1_mem_readb,

    NULL,

    NULL,

};

static CPUWriteMemoryFunc *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 *slavio_aux2_mem_read[3] = {

    slavio_aux2_mem_readb,

    NULL,

    NULL,

};

static CPUWriteMemoryFunc *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)

{

    MiscState *s = opaque;

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

    cpu_interrupt(s->env, CPU_INTERRUPT_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 *apc_mem_read[3] = {

    apc_mem_readb,

    NULL,

    NULL,

};

static CPUWriteMemoryFunc *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, saddr;

    saddr = addr & SYSCTRL_MAXADDR;

    switch (saddr) {

    case 0:

        ret = s->sysctrl;

        break;

    default:

        break;

    }

    MISC_DPRINTF("Read system control reg 0x" TARGET_FMT_plx " = %x\n", addr,

                 ret);

    return ret;

}

static void slavio_sysctrl_mem_writel(void *opaque, target_phys_addr_t addr,

                                      uint32_t val)

{

    MiscState *s = opaque;

    uint32_t saddr;

    saddr = addr & SYSCTRL_MAXADDR;

    MISC_DPRINTF("Write system control reg 0x" TARGET_FMT_plx " =  %x\n", addr,

                 val);

    switch (saddr) {

    case 0:

        if (val & SYS_RESET) {

            s->sysctrl = SYS_RESETSTAT;

            qemu_system_reset_request();

        }

        break;

    default:

        break;

    }

}

static CPUReadMemoryFunc *slavio_sysctrl_mem_read[3] = {

    NULL,

    NULL,

    slavio_sysctrl_mem_readl,

};

static CPUWriteMemoryFunc *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, saddr;

    saddr = addr & LED_MAXADDR;

    switch (saddr) {

    case 0:

        ret = s->leds;

        break;

    default:

        break;

    }

    MISC_DPRINTF("Read diagnostic LED reg 0x" TARGET_FMT_plx " = %x\n", addr,

                 ret);

    return ret;

}

static void slavio_led_mem_writew(void *opaque, target_phys_addr_t addr,

                                  uint32_t val)

{

    MiscState *s = opaque;

    uint32_t saddr;

    saddr = addr & LED_MAXADDR;

    MISC_DPRINTF("Write diagnostic LED reg 0x" TARGET_FMT_plx " =  %x\n", addr,

                 val);

    switch (saddr) {

    case 0:

        s->leds = val;

        break;

    default:

        break;

    }

}

static CPUReadMemoryFunc *slavio_led_mem_read[3] = {

    NULL,

    slavio_led_mem_readw,

    NULL,

};

static CPUWriteMemoryFunc *slavio_led_mem_write[3] = {

    NULL,

    slavio_led_mem_writew,

    NULL,

};

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

{

    MiscState *s = opaque;

    uint32_t tmp = 0;

    uint8_t tmp8;

    qemu_put_be32s(f, &tmp); /* ignored, was 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);

    tmp8 = s->sysctrl & 0xff;

    qemu_put_8s(f, &tmp8);

}

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

{

    MiscState *s = opaque;

    uint32_t tmp;

    uint8_t tmp8;

    if (version_id != 1)

        return -EINVAL;

    qemu_get_be32s(f, &tmp);

    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);

    qemu_get_8s(f, &tmp8);

    s->sysctrl = (uint32_t)tmp8;

    return 0;

}

void *slavio_misc_init(target_phys_addr_t base, target_phys_addr_t power_base,

                       target_phys_addr_t aux1_base,

                       target_phys_addr_t aux2_base, qemu_irq irq,

                       CPUState *env, qemu_irq **fdc_tc)

{

    int io;

    MiscState *s;

    s = qemu_mallocz(sizeof(MiscState));

    if (!s)

        return NULL;

    if (base) {

        /* 8 bit registers */

        io = cpu_register_io_memory(0, slavio_misc_mem_read,

                                    slavio_misc_mem_write, s);

        // Slavio control

        cpu_register_physical_memory(base + MISC_CFG, MISC_SIZE, io);

        // Diagnostics

        cpu_register_physical_memory(base + MISC_DIAG, MISC_SIZE, io);

        // Modem control

        cpu_register_physical_memory(base + MISC_MDM, MISC_SIZE, io);

        /* 16 bit registers */

        io = cpu_register_io_memory(0, slavio_led_mem_read,

                                    slavio_led_mem_write, s);

        /* ss600mp diag LEDs */

        cpu_register_physical_memory(base + MISC_LEDS, MISC_SIZE, io);

        /* 32 bit registers */

        io = cpu_register_io_memory(0, slavio_sysctrl_mem_read,

                                    slavio_sysctrl_mem_write, s);

        // System control

        cpu_register_physical_memory(base + MISC_SYS, SYSCTRL_SIZE, io);

    }

    // AUX 1 (Misc System Functions)

    if (aux1_base) {

        io = cpu_register_io_memory(0, slavio_aux1_mem_read,

                                    slavio_aux1_mem_write, s);

        cpu_register_physical_memory(aux1_base, MISC_SIZE, io);

    }

    // AUX 2 (Software Powerdown Control)

    if (aux2_base) {

        io = cpu_register_io_memory(0, slavio_aux2_mem_read,

                                    slavio_aux2_mem_write, s);

        cpu_register_physical_memory(aux2_base, MISC_SIZE, io);

    }

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

    if (power_base) {

        io = cpu_register_io_memory(0, apc_mem_read, apc_mem_write, s);

        cpu_register_physical_memory(power_base, MISC_SIZE, io);

    }

    s->irq = irq;

    s->env = env;

    *fdc_tc = &s->fdc_tc;

    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;

}