hw/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.h"
 #include "sysbus.h"
 #include "trace.h"
 #include "console.h"
 #include "usb.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;
     USBBus usbbus;
     USBPort usbport[2];
     USBDevice *usbdev;

     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 */
     int mouse_dx;
     int mouse_dy;
     int mouse_dz;
     uint8_t mouse_buttons_state;

     /* keyboard state */
     uint8_t kbd_usb_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\n", 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\n", 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\n", 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\n", offset, len);
         return;
     }

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

 static void softusb_mouse_changed(MilkymistSoftUsbState *s)
 {
     uint8_t m;
     uint8_t buf[4];

     buf[0] = s->mouse_buttons_state;
     buf[1] = s->mouse_dx;
     buf[2] = s->mouse_dy;
     buf[3] = s->mouse_dz;

     softusb_read_dmem(s, COMLOC_MEVT_PRODUCE, &m, 1);
     trace_milkymist_softusb_mevt(m);
     softusb_write_dmem(s, COMLOC_MEVT_BASE + 4 * m, buf, 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_usb_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_mouse_event(void *opaque,
        int dx, int dy, int dz, int buttons_state)
 {
     MilkymistSoftUsbState *s = opaque;

     /* if device is in reset, do nothing */
     if (s->regs[R_CTRL] & CTRL_RESET) {
         return;
     }

     trace_milkymist_softusb_mouse_event(dx, dy, dz, buttons_state);

     s->mouse_dx = dx;
     s->mouse_dy = dy;
     s->mouse_dz = dz;
     s->mouse_buttons_state = buttons_state;

     softusb_mouse_changed(s);
 }

 static void softusb_usbdev_datain(void *opaque)
 {
     MilkymistSoftUsbState *s = opaque;

     USBPacket p;

     p.pid = USB_TOKEN_IN;
     p.devep = 1;
     p.data = s->kbd_usb_buffer;
     p.len = sizeof(s->kbd_usb_buffer);
     s->usbdev->info->handle_data(s->usbdev, &p);

     softusb_kbd_changed(s);
 }

 static void softusb_attach(USBPort *port)
 {
 }

 static void softusb_device_destroy(USBBus *bus, USBDevice *dev)
 {
 }

 static USBPortOps softusb_ops = {
     .attach = softusb_attach,
 };

 static USBBusOps softusb_bus_ops = {
     .device_destroy = softusb_device_destroy,
 };

 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;
     }
     s->mouse_dx = 0;
     s->mouse_dy = 0;
     s->mouse_dz = 0;
     s->mouse_buttons_state = 0;
     memset(s->kbd_usb_buffer, 0, sizeof(s->kbd_usb_buffer));

     /* 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);

     qemu_add_mouse_event_handler(softusb_mouse_event, s, 0, "Milkymist Mouse");

     /* create our usb bus */
     usb_bus_new(&s->usbbus, &softusb_bus_ops, NULL);

     /* our two ports */
     usb_register_port(&s->usbbus, &s->usbport[0], NULL, 0, &softusb_ops,
             USB_SPEED_MASK_LOW);
     usb_register_port(&s->usbbus, &s->usbport[1], NULL, 1, &softusb_ops,
             USB_SPEED_MASK_LOW);

     /* and finally create an usb keyboard */
     s->usbdev = usb_create_simple(&s->usbbus, "usb-kbd");
     usb_hid_datain_cb(s->usbdev, s, softusb_usbdev_datain);
     s->usbdev->info->handle_reset(s->usbdev);

     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_INT32(mouse_dx, MilkymistSoftUsbState),
         VMSTATE_INT32(mouse_dy, MilkymistSoftUsbState),
         VMSTATE_INT32(mouse_dz, MilkymistSoftUsbState),
         VMSTATE_UINT8(mouse_buttons_state, MilkymistSoftUsbState),
         VMSTATE_BUFFER(kbd_usb_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)
	/*
	* 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 "usb.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;
	USBBus usbbus;
	USBPort usbport[2];
	USBDevice *usbdev;

	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 */
	int mouse_dx;
	int mouse_dy;
	int mouse_dz;
	uint8_t mouse_buttons_state;

	/* keyboard state */
	uint8_t kbd_usb_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\n", 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\n", 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\n", 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\n", offset, len);
	return;
	}

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

	static void softusb_mouse_changed(MilkymistSoftUsbState *s)
	{
	uint8_t m;
	uint8_t buf[4];

	buf[0] = s->mouse_buttons_state;
	buf[1] = s->mouse_dx;
	buf[2] = s->mouse_dy;
	buf[3] = s->mouse_dz;

	softusb_read_dmem(s, COMLOC_MEVT_PRODUCE, &m, 1);
	trace_milkymist_softusb_mevt(m);
	softusb_write_dmem(s, COMLOC_MEVT_BASE + 4 * m, buf, 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_usb_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_mouse_event(void *opaque,
	int dx, int dy, int dz, int buttons_state)
	{
	MilkymistSoftUsbState *s = opaque;

	/* if device is in reset, do nothing */
	if (s->regs[R_CTRL] & CTRL_RESET) {
	return;
	}

	trace_milkymist_softusb_mouse_event(dx, dy, dz, buttons_state);

	s->mouse_dx = dx;
	s->mouse_dy = dy;
	s->mouse_dz = dz;
	s->mouse_buttons_state = buttons_state;

	softusb_mouse_changed(s);
	}

	static void softusb_usbdev_datain(void *opaque)
	{
	MilkymistSoftUsbState *s = opaque;

	USBPacket p;

	p.pid = USB_TOKEN_IN;
	p.devep = 1;
	p.data = s->kbd_usb_buffer;
	p.len = sizeof(s->kbd_usb_buffer);
	s->usbdev->info->handle_data(s->usbdev, &p);

	softusb_kbd_changed(s);
	}

	static void softusb_attach(USBPort *port)
	{
	}

	static void softusb_device_destroy(USBBus bus, USBDevice dev)
	{
	}

	static USBPortOps softusb_ops = {
	.attach = softusb_attach,
	};

	static USBBusOps softusb_bus_ops = {
	.device_destroy = softusb_device_destroy,
	};

	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;
	}
	s->mouse_dx = 0;
	s->mouse_dy = 0;
	s->mouse_dz = 0;
	s->mouse_buttons_state = 0;
	memset(s->kbd_usb_buffer, 0, sizeof(s->kbd_usb_buffer));

	/* 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);

	qemu_add_mouse_event_handler(softusb_mouse_event, s, 0, "Milkymist Mouse");

	/* create our usb bus */
	usb_bus_new(&s->usbbus, &softusb_bus_ops, NULL);

	/* our two ports */
	usb_register_port(&s->usbbus, &s->usbport[0], NULL, 0, &softusb_ops,
	USB_SPEED_MASK_LOW);
	usb_register_port(&s->usbbus, &s->usbport[1], NULL, 1, &softusb_ops,
	USB_SPEED_MASK_LOW);

	/* and finally create an usb keyboard */
	s->usbdev = usb_create_simple(&s->usbbus, "usb-kbd");
	usb_hid_datain_cb(s->usbdev, s, softusb_usbdev_datain);
	s->usbdev->info->handle_reset(s->usbdev);

	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_INT32(mouse_dx, MilkymistSoftUsbState),
	VMSTATE_INT32(mouse_dy, MilkymistSoftUsbState),
	VMSTATE_INT32(mouse_dz, MilkymistSoftUsbState),
	VMSTATE_UINT8(mouse_buttons_state, MilkymistSoftUsbState),
	VMSTATE_BUFFER(kbd_usb_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)