hw/input/milkymist-softusb.c - qemu - Git at Google

 /*
  *  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/hw.h"
 #include "hw/sysbus.h"
 #include "trace.h"
 #include "ui/console.h"
 #include "hw/input/hid.h"
 #include "qemu/error-report.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

 #define TYPE_MILKYMIST_SOFTUSB "milkymist-softusb"
 #define MILKYMIST_SOFTUSB(obj) \
     OBJECT_CHECK(MilkymistSoftUsbState, (obj), TYPE_MILKYMIST_SOFTUSB)

 struct MilkymistSoftUsbState {
     SysBusDevice parent_obj;

     HIDState hid_kbd;
     HIDState hid_mouse;

     MemoryRegion regs_region;
     MemoryRegion pmem;
     MemoryRegion dmem;
     qemu_irq irq;

     void *pmem_ptr;
     void *dmem_ptr;

     /* device properties */
     uint32_t pmem_size;
     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 uint64_t softusb_read(void *opaque, hwaddr addr,
                              unsigned size)
 {
     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, hwaddr addr, uint64_t value,
               unsigned size)
 {
     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 const MemoryRegionOps softusb_mmio_ops = {
     .read = softusb_read,
     .write = softusb_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
     .valid = {
         .min_access_size = 4,
         .max_access_size = 4,
     },
 };

 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);
         memset(buf, 0, len);
         return;
     }

     memcpy(buf, s->dmem_ptr + offset, 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;
     }

     memcpy(s->dmem_ptr + 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;
     }

     while (hid_has_events(hs)) {
         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;
     }

     while (hid_has_events(hs)) {
         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 = MILKYMIST_SOFTUSB(d);
     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 = MILKYMIST_SOFTUSB(dev);

     sysbus_init_irq(dev, &s->irq);

     memory_region_init_io(&s->regs_region, OBJECT(s), &softusb_mmio_ops, s,
                           "milkymist-softusb", R_MAX * 4);
     sysbus_init_mmio(dev, &s->regs_region);

     /* register pmem and dmem */
     memory_region_init_ram(&s->pmem, OBJECT(s), "milkymist-softusb.pmem",
                            s->pmem_size, &error_abort);
     vmstate_register_ram_global(&s->pmem);
     s->pmem_ptr = memory_region_get_ram_ptr(&s->pmem);
     sysbus_init_mmio(dev, &s->pmem);
     memory_region_init_ram(&s->dmem, OBJECT(s), "milkymist-softusb.dmem",
                            s->dmem_size, &error_abort);
     vmstate_register_ram_global(&s->dmem);
     s->dmem_ptr = memory_region_get_ram_ptr(&s->dmem);
     sysbus_init_mmio(dev, &s->dmem);

     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,
     .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 Property milkymist_softusb_properties[] = {
     DEFINE_PROP_UINT32("pmem_size", MilkymistSoftUsbState, pmem_size, 0x00001000),
     DEFINE_PROP_UINT32("dmem_size", MilkymistSoftUsbState, dmem_size, 0x00002000),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void milkymist_softusb_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

     k->init = milkymist_softusb_init;
     dc->reset = milkymist_softusb_reset;
     dc->vmsd = &vmstate_milkymist_softusb;
     dc->props = milkymist_softusb_properties;
 }

 static const TypeInfo milkymist_softusb_info = {
     .name          = TYPE_MILKYMIST_SOFTUSB,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(MilkymistSoftUsbState),
     .class_init    = milkymist_softusb_class_init,
 };

 static void milkymist_softusb_register_types(void)
 {
     type_register_static(&milkymist_softusb_info);
 }

 type_init(milkymist_softusb_register_types)
	/*
	* 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/hw.h"
	#include "hw/sysbus.h"
	#include "trace.h"
	#include "ui/console.h"
	#include "hw/input/hid.h"
	#include "qemu/error-report.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

	#define TYPE_MILKYMIST_SOFTUSB "milkymist-softusb"
	#define MILKYMIST_SOFTUSB(obj) \
	OBJECT_CHECK(MilkymistSoftUsbState, (obj), TYPE_MILKYMIST_SOFTUSB)

	struct MilkymistSoftUsbState {
	SysBusDevice parent_obj;

	HIDState hid_kbd;
	HIDState hid_mouse;

	MemoryRegion regs_region;
	MemoryRegion pmem;
	MemoryRegion dmem;
	qemu_irq irq;

	void *pmem_ptr;
	void *dmem_ptr;

	/* device properties */
	uint32_t pmem_size;
	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 uint64_t softusb_read(void *opaque, hwaddr addr,
	unsigned size)
	{
	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, hwaddr addr, uint64_t value,
	unsigned size)
	{
	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 const MemoryRegionOps softusb_mmio_ops = {
	.read = softusb_read,
	.write = softusb_write,
	.endianness = DEVICE_NATIVE_ENDIAN,
	.valid = {
	.min_access_size = 4,
	.max_access_size = 4,
	},
	};

	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);
	memset(buf, 0, len);
	return;
	}

	memcpy(buf, s->dmem_ptr + offset, 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;
	}

	memcpy(s->dmem_ptr + 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;
	}

	while (hid_has_events(hs)) {
	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;
	}

	while (hid_has_events(hs)) {
	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 = MILKYMIST_SOFTUSB(d);
	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 = MILKYMIST_SOFTUSB(dev);

	sysbus_init_irq(dev, &s->irq);

	memory_region_init_io(&s->regs_region, OBJECT(s), &softusb_mmio_ops, s,
	"milkymist-softusb", R_MAX * 4);
	sysbus_init_mmio(dev, &s->regs_region);

	/* register pmem and dmem */
	memory_region_init_ram(&s->pmem, OBJECT(s), "milkymist-softusb.pmem",
	s->pmem_size, &error_abort);
	vmstate_register_ram_global(&s->pmem);
	s->pmem_ptr = memory_region_get_ram_ptr(&s->pmem);
	sysbus_init_mmio(dev, &s->pmem);
	memory_region_init_ram(&s->dmem, OBJECT(s), "milkymist-softusb.dmem",
	s->dmem_size, &error_abort);
	vmstate_register_ram_global(&s->dmem);
	s->dmem_ptr = memory_region_get_ram_ptr(&s->dmem);
	sysbus_init_mmio(dev, &s->dmem);

	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,
	.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 Property milkymist_softusb_properties[] = {
	DEFINE_PROP_UINT32("pmem_size", MilkymistSoftUsbState, pmem_size, 0x00001000),
	DEFINE_PROP_UINT32("dmem_size", MilkymistSoftUsbState, dmem_size, 0x00002000),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void milkymist_softusb_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

	k->init = milkymist_softusb_init;
	dc->reset = milkymist_softusb_reset;
	dc->vmsd = &vmstate_milkymist_softusb;
	dc->props = milkymist_softusb_properties;
	}

	static const TypeInfo milkymist_softusb_info = {
	.name = TYPE_MILKYMIST_SOFTUSB,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(MilkymistSoftUsbState),
	.class_init = milkymist_softusb_class_init,
	};

	static void milkymist_softusb_register_types(void)
	{
	type_register_static(&milkymist_softusb_info);
	}

	type_init(milkymist_softusb_register_types)