Archipelago » qemu

/*

 * Arm PrimeCell PL061 General Purpose IO with additional

 * Luminary Micro Stellaris bits.

 *

 * Copyright (c) 2007 CodeSourcery.

 * Written by Paul Brook

 *

 * This code is licensed under the GPL.

 */

#include "sysbus.h"

//#define DEBUG_PL061 1

#ifdef DEBUG_PL061

#define DPRINTF(fmt, ...) \

do { printf("pl061: " fmt , ## __VA_ARGS__); } while (0)

#define BADF(fmt, ...) \

do { fprintf(stderr, "pl061: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)

#else

#define DPRINTF(fmt, ...) do {} while(0)

#define BADF(fmt, ...) \

do { fprintf(stderr, "pl061: error: " fmt , ## __VA_ARGS__);} while (0)

#endif

static const uint8_t pl061_id[12] =

  { 0x00, 0x00, 0x00, 0x00, 0x61, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };

static const uint8_t pl061_id_luminary[12] =

  { 0x00, 0x00, 0x00, 0x00, 0x61, 0x00, 0x18, 0x01, 0x0d, 0xf0, 0x05, 0xb1 };

typedef struct {

    SysBusDevice busdev;

    uint32_t locked;

    uint32_t data;

    uint32_t old_data;

    uint32_t dir;

    uint32_t isense;

    uint32_t ibe;

    uint32_t iev;

    uint32_t im;

    uint32_t istate;

    uint32_t afsel;

    uint32_t dr2r;

    uint32_t dr4r;

    uint32_t dr8r;

    uint32_t odr;

    uint32_t pur;

    uint32_t pdr;

    uint32_t slr;

    uint32_t den;

    uint32_t cr;

    uint32_t float_high;

    uint32_t amsel;

    qemu_irq irq;

    qemu_irq out[8];

    const unsigned char *id;

} pl061_state;

static const VMStateDescription vmstate_pl061 = {

    .name = "pl061",

    .version_id = 2,

    .minimum_version_id = 1,

    .fields = (VMStateField[]) {

        VMSTATE_UINT32(locked, pl061_state),

        VMSTATE_UINT32(data, pl061_state),

        VMSTATE_UINT32(old_data, pl061_state),

        VMSTATE_UINT32(dir, pl061_state),

        VMSTATE_UINT32(isense, pl061_state),

        VMSTATE_UINT32(ibe, pl061_state),

        VMSTATE_UINT32(iev, pl061_state),

        VMSTATE_UINT32(im, pl061_state),

        VMSTATE_UINT32(istate, pl061_state),

        VMSTATE_UINT32(afsel, pl061_state),

        VMSTATE_UINT32(dr2r, pl061_state),

        VMSTATE_UINT32(dr4r, pl061_state),

        VMSTATE_UINT32(dr8r, pl061_state),

        VMSTATE_UINT32(odr, pl061_state),

        VMSTATE_UINT32(pur, pl061_state),

        VMSTATE_UINT32(pdr, pl061_state),

        VMSTATE_UINT32(slr, pl061_state),

        VMSTATE_UINT32(den, pl061_state),

        VMSTATE_UINT32(cr, pl061_state),

        VMSTATE_UINT32(float_high, pl061_state),

        VMSTATE_UINT32_V(amsel, pl061_state, 2),

        VMSTATE_END_OF_LIST()

    }

};

static void pl061_update(pl061_state *s)

{

    uint8_t changed;

    uint8_t mask;

    uint8_t out;

    int i;

    /* Outputs float high.  */

    /* FIXME: This is board dependent.  */

    out = (s->data & s->dir) | ~s->dir;

    changed = s->old_data ^ out;

    if (!changed)

        return;

    s->old_data = out;

    for (i = 0; i < 8; i++) {

        mask = 1 << i;

        if ((changed & mask) && s->out) {

            DPRINTF("Set output %d = %d\n", i, (out & mask) != 0);

            qemu_set_irq(s->out[i], (out & mask) != 0);

        }

    }

    /* FIXME: Implement input interrupts.  */

}

static uint32_t pl061_read(void *opaque, target_phys_addr_t offset)

{

    pl061_state *s = (pl061_state *)opaque;

    if (offset >= 0xfd0 && offset < 0x1000) {

        return s->id[(offset - 0xfd0) >> 2];

    }

    if (offset < 0x400) {

        return s->data & (offset >> 2);

    }

    switch (offset) {

    case 0x400: /* Direction */

        return s->dir;

    case 0x404: /* Interrupt sense */

        return s->isense;

    case 0x408: /* Interrupt both edges */

        return s->ibe;

    case 0x40c: /* Interrupt event */

        return s->iev;

    case 0x410: /* Interrupt mask */

        return s->im;

    case 0x414: /* Raw interrupt status */

        return s->istate;

    case 0x418: /* Masked interrupt status */

        return s->istate | s->im;

    case 0x420: /* Alternate function select */

        return s->afsel;

    case 0x500: /* 2mA drive */

        return s->dr2r;

    case 0x504: /* 4mA drive */

        return s->dr4r;

    case 0x508: /* 8mA drive */

        return s->dr8r;

    case 0x50c: /* Open drain */

        return s->odr;

    case 0x510: /* Pull-up */

        return s->pur;

    case 0x514: /* Pull-down */

        return s->pdr;

    case 0x518: /* Slew rate control */

        return s->slr;

    case 0x51c: /* Digital enable */

        return s->den;

    case 0x520: /* Lock */

        return s->locked;

    case 0x524: /* Commit */

        return s->cr;

    case 0x528: /* Analog mode select */

        return s->amsel;

    default:

        hw_error("pl061_read: Bad offset %x\n", (int)offset);

        return 0;

    }

}

static void pl061_write(void *opaque, target_phys_addr_t offset,

                        uint32_t value)

{

    pl061_state *s = (pl061_state *)opaque;

    uint8_t mask;

    if (offset < 0x400) {

        mask = (offset >> 2) & s->dir;

        s->data = (s->data & ~mask) | (value & mask);

        pl061_update(s);

        return;

    }

    switch (offset) {

    case 0x400: /* Direction */

        s->dir = value & 0xff;

        break;

    case 0x404: /* Interrupt sense */

        s->isense = value & 0xff;

        break;

    case 0x408: /* Interrupt both edges */

        s->ibe = value & 0xff;

        break;

    case 0x40c: /* Interrupt event */

        s->iev = value & 0xff;

        break;

    case 0x410: /* Interrupt mask */

        s->im = value & 0xff;

        break;

    case 0x41c: /* Interrupt clear */

        s->istate &= ~value;

        break;

    case 0x420: /* Alternate function select */

        mask = s->cr;

        s->afsel = (s->afsel & ~mask) | (value & mask);

        break;

    case 0x500: /* 2mA drive */

        s->dr2r = value & 0xff;

        break;

    case 0x504: /* 4mA drive */

        s->dr4r = value & 0xff;

        break;

    case 0x508: /* 8mA drive */

        s->dr8r = value & 0xff;

        break;

    case 0x50c: /* Open drain */

        s->odr = value & 0xff;

        break;

    case 0x510: /* Pull-up */

        s->pur = value & 0xff;

        break;

    case 0x514: /* Pull-down */

        s->pdr = value & 0xff;

        break;

    case 0x518: /* Slew rate control */

        s->slr = value & 0xff;

        break;

    case 0x51c: /* Digital enable */

        s->den = value & 0xff;

        break;

    case 0x520: /* Lock */

        s->locked = (value != 0xacce551);

        break;

    case 0x524: /* Commit */

        if (!s->locked)

            s->cr = value & 0xff;

        break;

    case 0x528:

        s->amsel = value & 0xff;

        break;

    default:

        hw_error("pl061_write: Bad offset %x\n", (int)offset);

    }

    pl061_update(s);

}

static void pl061_reset(pl061_state *s)

{

  s->locked = 1;

  s->cr = 0xff;

}

static void pl061_set_irq(void * opaque, int irq, int level)

{

    pl061_state *s = (pl061_state *)opaque;

    uint8_t mask;

    mask = 1 << irq;

    if ((s->dir & mask) == 0) {

        s->data &= ~mask;

        if (level)

            s->data |= mask;

        pl061_update(s);

    }

}

static CPUReadMemoryFunc * const pl061_readfn[] = {

   pl061_read,

   pl061_read,

   pl061_read

};

static CPUWriteMemoryFunc * const pl061_writefn[] = {

   pl061_write,

   pl061_write,

   pl061_write

};

static int pl061_init(SysBusDevice *dev, const unsigned char *id)

{

    int iomemtype;

    pl061_state *s = FROM_SYSBUS(pl061_state, dev);

    s->id = id;

    iomemtype = cpu_register_io_memory(pl061_readfn,

                                       pl061_writefn, s,

                                       DEVICE_NATIVE_ENDIAN);

    sysbus_init_mmio(dev, 0x1000, iomemtype);

    sysbus_init_irq(dev, &s->irq);

    qdev_init_gpio_in(&dev->qdev, pl061_set_irq, 8);

    qdev_init_gpio_out(&dev->qdev, s->out, 8);

    pl061_reset(s);

    return 0;

}

static int pl061_init_luminary(SysBusDevice *dev)

{

    return pl061_init(dev, pl061_id_luminary);

}

static int pl061_init_arm(SysBusDevice *dev)

{

    return pl061_init(dev, pl061_id);

}

static SysBusDeviceInfo pl061_info = {

    .init = pl061_init_arm,

    .qdev.name = "pl061",

    .qdev.size = sizeof(pl061_state),

    .qdev.vmsd = &vmstate_pl061,

};

static SysBusDeviceInfo pl061_luminary_info = {

    .init = pl061_init_luminary,

    .qdev.name = "pl061_luminary",

    .qdev.size = sizeof(pl061_state),

    .qdev.vmsd = &vmstate_pl061,

};

static void pl061_register_devices(void)

{

    sysbus_register_withprop(&pl061_info);

    sysbus_register_withprop(&pl061_luminary_info);

}

device_init(pl061_register_devices)