Archipelago » qemu

/*

 *  QEMU model of the Milkymist SoftUSB block.

 *

 *  Copyright (c) 2010 Michael Walle <michael@walle.cc>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 *

 *

 * Specification available at:

 *   not available yet

 */

#include "hw.h"

#include "sysbus.h"

#include "trace.h"

#include "console.h"

#include "hid.h"

#include "qemu-error.h"

enum {

    R_CTRL = 0,

    R_MAX

};

enum {

    CTRL_RESET = (1<<0),

};

#define COMLOC_DEBUG_PRODUCE 0x1000

#define COMLOC_DEBUG_BASE    0x1001

#define COMLOC_MEVT_PRODUCE  0x1101

#define COMLOC_MEVT_BASE     0x1102

#define COMLOC_KEVT_PRODUCE  0x1142

#define COMLOC_KEVT_BASE     0x1143

struct MilkymistSoftUsbState {

    SysBusDevice busdev;

    HIDState hid_kbd;

    HIDState hid_mouse;

    qemu_irq irq;

    /* device properties */

    uint32_t pmem_base;

    uint32_t pmem_size;

    uint32_t dmem_base;

    uint32_t dmem_size;

    /* device registers */

    uint32_t regs[R_MAX];

    /* mouse state */

    uint8_t mouse_hid_buffer[4];

    /* keyboard state */

    uint8_t kbd_hid_buffer[8];

};

typedef struct MilkymistSoftUsbState MilkymistSoftUsbState;

static uint32_t softusb_read(void *opaque, target_phys_addr_t addr)

{

    MilkymistSoftUsbState *s = opaque;

    uint32_t r = 0;

    addr >>= 2;

    switch (addr) {

    case R_CTRL:

        r = s->regs[addr];

        break;

    default:

        error_report("milkymist_softusb: read access to unknown register 0x"

                TARGET_FMT_plx, addr << 2);

        break;

    }

    trace_milkymist_softusb_memory_read(addr << 2, r);

    return r;

}

static void

softusb_write(void *opaque, target_phys_addr_t addr, uint32_t value)

{

    MilkymistSoftUsbState *s = opaque;

    trace_milkymist_softusb_memory_write(addr, value);

    addr >>= 2;

    switch (addr) {

    case R_CTRL:

        s->regs[addr] = value;

        break;

    default:

        error_report("milkymist_softusb: write access to unknown register 0x"

                TARGET_FMT_plx, addr << 2);

        break;

    }

}

static CPUReadMemoryFunc * const softusb_read_fn[] = {

    NULL,

    NULL,

    &softusb_read,

};

static CPUWriteMemoryFunc * const softusb_write_fn[] = {

    NULL,

    NULL,

    &softusb_write,

};

static inline void softusb_read_dmem(MilkymistSoftUsbState *s,

        uint32_t offset, uint8_t *buf, uint32_t len)

{

    if (offset + len >= s->dmem_size) {

        error_report("milkymist_softusb: read dmem out of bounds "

                "at offset 0x%x, len %d", offset, len);

        return;

    }

    cpu_physical_memory_read(s->dmem_base + offset, buf, len);

}

static inline void softusb_write_dmem(MilkymistSoftUsbState *s,

        uint32_t offset, uint8_t *buf, uint32_t len)

{

    if (offset + len >= s->dmem_size) {

        error_report("milkymist_softusb: write dmem out of bounds "

                "at offset 0x%x, len %d", offset, len);

        return;

    }

    cpu_physical_memory_write(s->dmem_base + offset, buf, len);

}

static inline void softusb_read_pmem(MilkymistSoftUsbState *s,

        uint32_t offset, uint8_t *buf, uint32_t len)

{

    if (offset + len >= s->pmem_size) {

        error_report("milkymist_softusb: read pmem out of bounds "

                "at offset 0x%x, len %d", offset, len);

        return;

    }

    cpu_physical_memory_read(s->pmem_base + offset, buf, len);

}

static inline void softusb_write_pmem(MilkymistSoftUsbState *s,

        uint32_t offset, uint8_t *buf, uint32_t len)

{

    if (offset + len >= s->pmem_size) {

        error_report("milkymist_softusb: write pmem out of bounds "

                "at offset 0x%x, len %d", offset, len);

        return;

    }

    cpu_physical_memory_write(s->pmem_base + offset, buf, len);

}

static void softusb_mouse_changed(MilkymistSoftUsbState *s)

{

    uint8_t m;

    softusb_read_dmem(s, COMLOC_MEVT_PRODUCE, &m, 1);

    trace_milkymist_softusb_mevt(m);

    softusb_write_dmem(s, COMLOC_MEVT_BASE + 4 * m, s->mouse_hid_buffer, 4);

    m = (m + 1) & 0xf;

    softusb_write_dmem(s, COMLOC_MEVT_PRODUCE, &m, 1);

    trace_milkymist_softusb_pulse_irq();

    qemu_irq_pulse(s->irq);

}

static void softusb_kbd_changed(MilkymistSoftUsbState *s)

{

    uint8_t m;

    softusb_read_dmem(s, COMLOC_KEVT_PRODUCE, &m, 1);

    trace_milkymist_softusb_kevt(m);

    softusb_write_dmem(s, COMLOC_KEVT_BASE + 8 * m, s->kbd_hid_buffer, 8);

    m = (m + 1) & 0x7;

    softusb_write_dmem(s, COMLOC_KEVT_PRODUCE, &m, 1);

    trace_milkymist_softusb_pulse_irq();

    qemu_irq_pulse(s->irq);

}

static void softusb_kbd_hid_datain(HIDState *hs)

{

    MilkymistSoftUsbState *s = container_of(hs, MilkymistSoftUsbState, hid_kbd);

    int len;

    /* if device is in reset, do nothing */

    if (s->regs[R_CTRL] & CTRL_RESET) {

        return;

    }

    len = hid_keyboard_poll(hs, s->kbd_hid_buffer, sizeof(s->kbd_hid_buffer));

    if (len == 8) {

        softusb_kbd_changed(s);

    }

}

static void softusb_mouse_hid_datain(HIDState *hs)

{

    MilkymistSoftUsbState *s =

            container_of(hs, MilkymistSoftUsbState, hid_mouse);

    int len;

    /* if device is in reset, do nothing */

    if (s->regs[R_CTRL] & CTRL_RESET) {

        return;

    }

    len = hid_pointer_poll(hs, s->mouse_hid_buffer,

            sizeof(s->mouse_hid_buffer));

    if (len == 4) {

        softusb_mouse_changed(s);

    }

}

static void milkymist_softusb_reset(DeviceState *d)

{

    MilkymistSoftUsbState *s =

            container_of(d, MilkymistSoftUsbState, busdev.qdev);

    int i;

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

        s->regs[i] = 0;

    }

    memset(s->kbd_hid_buffer, 0, sizeof(s->kbd_hid_buffer));

    memset(s->mouse_hid_buffer, 0, sizeof(s->mouse_hid_buffer));

    hid_reset(&s->hid_kbd);

    hid_reset(&s->hid_mouse);

    /* defaults */

    s->regs[R_CTRL] = CTRL_RESET;

}

static int milkymist_softusb_init(SysBusDevice *dev)

{

    MilkymistSoftUsbState *s = FROM_SYSBUS(typeof(*s), dev);

    int softusb_regs;

    ram_addr_t pmem_ram;

    ram_addr_t dmem_ram;

    sysbus_init_irq(dev, &s->irq);

    softusb_regs = cpu_register_io_memory(softusb_read_fn, softusb_write_fn, s,

            DEVICE_NATIVE_ENDIAN);

    sysbus_init_mmio(dev, R_MAX * 4, softusb_regs);

    /* register pmem and dmem */

    pmem_ram = qemu_ram_alloc(NULL, "milkymist_softusb.pmem", s->pmem_size);

    cpu_register_physical_memory(s->pmem_base, s->pmem_size,

            pmem_ram | IO_MEM_RAM);

    dmem_ram = qemu_ram_alloc(NULL, "milkymist_softusb.dmem", s->dmem_size);

    cpu_register_physical_memory(s->dmem_base, s->dmem_size,

            dmem_ram | IO_MEM_RAM);

    hid_init(&s->hid_kbd, HID_KEYBOARD, softusb_kbd_hid_datain);

    hid_init(&s->hid_mouse, HID_MOUSE, softusb_mouse_hid_datain);

    return 0;

}

static const VMStateDescription vmstate_milkymist_softusb = {

    .name = "milkymist-softusb",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields      = (VMStateField[]) {

        VMSTATE_UINT32_ARRAY(regs, MilkymistSoftUsbState, R_MAX),

        VMSTATE_HID_KEYBOARD_DEVICE(hid_kbd, MilkymistSoftUsbState),

        VMSTATE_HID_POINTER_DEVICE(hid_mouse, MilkymistSoftUsbState),

        VMSTATE_BUFFER(kbd_hid_buffer, MilkymistSoftUsbState),

        VMSTATE_BUFFER(mouse_hid_buffer, MilkymistSoftUsbState),

        VMSTATE_END_OF_LIST()

    }

};

static SysBusDeviceInfo milkymist_softusb_info = {

    .init = milkymist_softusb_init,

    .qdev.name  = "milkymist-softusb",

    .qdev.size  = sizeof(MilkymistSoftUsbState),

    .qdev.vmsd  = &vmstate_milkymist_softusb,

    .qdev.reset = milkymist_softusb_reset,

    .qdev.props = (Property[]) {

        DEFINE_PROP_UINT32(

                "pmem_base", MilkymistSoftUsbState, pmem_base, 0xa0000000

        ),

        DEFINE_PROP_UINT32(

                "pmem_size", MilkymistSoftUsbState, pmem_size, 0x00001000

        ),

        DEFINE_PROP_UINT32(

                "dmem_base", MilkymistSoftUsbState, dmem_base, 0xa0020000

        ),

        DEFINE_PROP_UINT32(

                "dmem_size", MilkymistSoftUsbState, dmem_size, 0x00002000

        ),

        DEFINE_PROP_END_OF_LIST(),

    }

};

static void milkymist_softusb_register(void)

{

    sysbus_register_withprop(&milkymist_softusb_info);

}

device_init(milkymist_softusb_register)