hw/milkymist-vgafb.c - qemu - Git at Google


 /*
  *  QEMU model of the Milkymist VGA framebuffer.
  *
  *  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:
  *   http://www.milkymist.org/socdoc/vgafb.pdf
  */

 #include "hw.h"
 #include "sysbus.h"
 #include "trace.h"
 #include "console.h"
 #include "framebuffer.h"
 #include "pixel_ops.h"
 #include "qemu-error.h"

 #define BITS 8
 #include "milkymist-vgafb_template.h"
 #define BITS 15
 #include "milkymist-vgafb_template.h"
 #define BITS 16
 #include "milkymist-vgafb_template.h"
 #define BITS 24
 #include "milkymist-vgafb_template.h"
 #define BITS 32
 #include "milkymist-vgafb_template.h"

 enum {
     R_CTRL = 0,
     R_HRES,
     R_HSYNC_START,
     R_HSYNC_END,
     R_HSCAN,
     R_VRES,
     R_VSYNC_START,
     R_VSYNC_END,
     R_VSCAN,
     R_BASEADDRESS,
     R_BASEADDRESS_ACT,
     R_BURST_COUNT,
     R_SOURCE_CLOCK,
     R_MAX
 };

 enum {
     CTRL_RESET = (1<<0),
 };

 struct MilkymistVgafbState {
     SysBusDevice busdev;
     DisplayState *ds;

     int invalidate;
     uint32_t fb_offset;
     uint32_t fb_mask;

     uint32_t regs[R_MAX];
 };
 typedef struct MilkymistVgafbState MilkymistVgafbState;

 static int vgafb_enabled(MilkymistVgafbState *s)
 {
     return !(s->regs[R_CTRL] & CTRL_RESET);
 }

 static void vgafb_update_display(void *opaque)
 {
     MilkymistVgafbState *s = opaque;
     int first = 0;
     int last = 0;
     drawfn fn;

     if (!vgafb_enabled(s)) {
         return;
     }

     int dest_width = s->regs[R_HRES];

     switch (ds_get_bits_per_pixel(s->ds)) {
     case 0:
         return;
     case 8:
         fn = draw_line_8;
         break;
     case 15:
         fn = draw_line_15;
         dest_width *= 2;
         break;
     case 16:
         fn = draw_line_16;
         dest_width *= 2;
         break;
     case 24:
         fn = draw_line_24;
         dest_width *= 3;
         break;
     case 32:
         fn = draw_line_32;
         dest_width *= 4;
         break;
     default:
         hw_error("milkymist_vgafb: bad color depth\n");
         break;
     }

     framebuffer_update_display(s->ds,
                                s->regs[R_BASEADDRESS] + s->fb_offset,
                                s->regs[R_HRES],
                                s->regs[R_VRES],
                                s->regs[R_HRES] * 2,
                                dest_width,
                                0,
                                s->invalidate,
                                fn,
                                NULL,
                                &first, &last);

     if (first >= 0) {
         dpy_update(s->ds, 0, first, s->regs[R_HRES], last - first + 1);
     }
     s->invalidate = 0;
 }

 static void vgafb_invalidate_display(void *opaque)
 {
     MilkymistVgafbState *s = opaque;
     s->invalidate = 1;
 }

 static void vgafb_resize(MilkymistVgafbState *s)
 {
     if (!vgafb_enabled(s)) {
         return;
     }

     qemu_console_resize(s->ds, s->regs[R_HRES], s->regs[R_VRES]);
     s->invalidate = 1;
 }

 static uint32_t vgafb_read(void *opaque, target_phys_addr_t addr)
 {
     MilkymistVgafbState *s = opaque;
     uint32_t r = 0;

     addr >>= 2;
     switch (addr) {
     case R_CTRL:
     case R_HRES:
     case R_HSYNC_START:
     case R_HSYNC_END:
     case R_HSCAN:
     case R_VRES:
     case R_VSYNC_START:
     case R_VSYNC_END:
     case R_VSCAN:
     case R_BASEADDRESS:
     case R_BURST_COUNT:
     case R_SOURCE_CLOCK:
         r = s->regs[addr];
     break;
     case R_BASEADDRESS_ACT:
         r = s->regs[R_BASEADDRESS];
     break;

     default:
         error_report("milkymist_vgafb: read access to unknown register 0x"
                 TARGET_FMT_plx, addr << 2);
         break;
     }

     trace_milkymist_vgafb_memory_read(addr << 2, r);

     return r;
 }

 static void
 vgafb_write(void *opaque, target_phys_addr_t addr, uint32_t value)
 {
     MilkymistVgafbState *s = opaque;

     trace_milkymist_vgafb_memory_write(addr, value);

     addr >>= 2;
     switch (addr) {
     case R_CTRL:
     case R_HSYNC_START:
     case R_HSYNC_END:
     case R_HSCAN:
     case R_VSYNC_START:
     case R_VSYNC_END:
     case R_VSCAN:
     case R_BURST_COUNT:
     case R_SOURCE_CLOCK:
         s->regs[addr] = value;
         break;
     case R_BASEADDRESS:
         if (value & 0x1f) {
             error_report("milkymist_vgafb: framebuffer base address have to "
                      "be 32 byte aligned");
             break;
         }
         s->regs[addr] = value & s->fb_mask;
         s->invalidate = 1;
         break;
     case R_HRES:
     case R_VRES:
         s->regs[addr] = value;
         vgafb_resize(s);
         break;
     case R_BASEADDRESS_ACT:
         error_report("milkymist_vgafb: write to read-only register 0x"
                 TARGET_FMT_plx, addr << 2);
         break;

     default:
         error_report("milkymist_vgafb: write access to unknown register 0x"
                 TARGET_FMT_plx, addr << 2);
         break;
     }
 }

 static CPUReadMemoryFunc * const vgafb_read_fn[] = {
    NULL,
    NULL,
    &vgafb_read
 };

 static CPUWriteMemoryFunc * const vgafb_write_fn[] = {
    NULL,
    NULL,
    &vgafb_write
 };

 static void milkymist_vgafb_reset(DeviceState *d)
 {
     MilkymistVgafbState *s = container_of(d, MilkymistVgafbState, busdev.qdev);
     int i;

     for (i = 0; i < R_MAX; i++) {
         s->regs[i] = 0;
     }

     /* defaults */
     s->regs[R_CTRL] = CTRL_RESET;
     s->regs[R_HRES] = 640;
     s->regs[R_VRES] = 480;
     s->regs[R_BASEADDRESS] = 0;
 }

 static int milkymist_vgafb_init(SysBusDevice *dev)
 {
     MilkymistVgafbState *s = FROM_SYSBUS(typeof(*s), dev);
     int vgafb_regs;

     vgafb_regs = cpu_register_io_memory(vgafb_read_fn, vgafb_write_fn, s,
             DEVICE_NATIVE_ENDIAN);
     sysbus_init_mmio(dev, R_MAX * 4, vgafb_regs);

     s->ds = graphic_console_init(vgafb_update_display,
                                  vgafb_invalidate_display,
                                  NULL, NULL, s);

     return 0;
 }

 static int vgafb_post_load(void *opaque, int version_id)
 {
     vgafb_invalidate_display(opaque);
     return 0;
 }

 static const VMStateDescription vmstate_milkymist_vgafb = {
     .name = "milkymist-vgafb",
     .version_id = 1,
     .minimum_version_id = 1,
     .minimum_version_id_old = 1,
     .post_load = vgafb_post_load,
     .fields      = (VMStateField[]) {
         VMSTATE_UINT32_ARRAY(regs, MilkymistVgafbState, R_MAX),
         VMSTATE_END_OF_LIST()
     }
 };

 static SysBusDeviceInfo milkymist_vgafb_info = {
     .init = milkymist_vgafb_init,
     .qdev.name  = "milkymist-vgafb",
     .qdev.size  = sizeof(MilkymistVgafbState),
     .qdev.vmsd  = &vmstate_milkymist_vgafb,
     .qdev.reset = milkymist_vgafb_reset,
     .qdev.props = (Property[]) {
         DEFINE_PROP_UINT32("fb_offset", MilkymistVgafbState, fb_offset, 0x0),
         DEFINE_PROP_UINT32("fb_mask", MilkymistVgafbState, fb_mask, 0xffffffff),
         DEFINE_PROP_END_OF_LIST(),
     }
 };

 static void milkymist_vgafb_register(void)
 {
     sysbus_register_withprop(&milkymist_vgafb_info);
 }

 device_init(milkymist_vgafb_register)

	/*
	* QEMU model of the Milkymist VGA framebuffer.
	*
	* 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:
	* http://www.milkymist.org/socdoc/vgafb.pdf
	*/

	#include "hw.h"
	#include "sysbus.h"
	#include "trace.h"
	#include "console.h"
	#include "framebuffer.h"
	#include "pixel_ops.h"
	#include "qemu-error.h"

	#define BITS 8
	#include "milkymist-vgafb_template.h"
	#define BITS 15
	#include "milkymist-vgafb_template.h"
	#define BITS 16
	#include "milkymist-vgafb_template.h"
	#define BITS 24
	#include "milkymist-vgafb_template.h"
	#define BITS 32
	#include "milkymist-vgafb_template.h"

	enum {
	R_CTRL = 0,
	R_HRES,
	R_HSYNC_START,
	R_HSYNC_END,
	R_HSCAN,
	R_VRES,
	R_VSYNC_START,
	R_VSYNC_END,
	R_VSCAN,
	R_BASEADDRESS,
	R_BASEADDRESS_ACT,
	R_BURST_COUNT,
	R_SOURCE_CLOCK,
	R_MAX
	};

	enum {
	CTRL_RESET = (1<<0),
	};

	struct MilkymistVgafbState {
	SysBusDevice busdev;
	DisplayState *ds;

	int invalidate;
	uint32_t fb_offset;
	uint32_t fb_mask;

	uint32_t regs[R_MAX];
	};
	typedef struct MilkymistVgafbState MilkymistVgafbState;

	static int vgafb_enabled(MilkymistVgafbState *s)
	{
	return !(s->regs[R_CTRL] & CTRL_RESET);
	}

	static void vgafb_update_display(void *opaque)
	{
	MilkymistVgafbState *s = opaque;
	int first = 0;
	int last = 0;
	drawfn fn;

	if (!vgafb_enabled(s)) {
	return;
	}

	int dest_width = s->regs[R_HRES];

	switch (ds_get_bits_per_pixel(s->ds)) {
	case 0:
	return;
	case 8:
	fn = draw_line_8;
	break;
	case 15:
	fn = draw_line_15;
	dest_width *= 2;
	break;
	case 16:
	fn = draw_line_16;
	dest_width *= 2;
	break;
	case 24:
	fn = draw_line_24;
	dest_width *= 3;
	break;
	case 32:
	fn = draw_line_32;
	dest_width *= 4;
	break;
	default:
	hw_error("milkymist_vgafb: bad color depth\n");
	break;
	}

	framebuffer_update_display(s->ds,
	s->regs[R_BASEADDRESS] + s->fb_offset,
	s->regs[R_HRES],
	s->regs[R_VRES],
	s->regs[R_HRES] * 2,
	dest_width,
	0,
	s->invalidate,
	fn,
	NULL,
	&first, &last);

	if (first >= 0) {
	dpy_update(s->ds, 0, first, s->regs[R_HRES], last - first + 1);
	}
	s->invalidate = 0;
	}

	static void vgafb_invalidate_display(void *opaque)
	{
	MilkymistVgafbState *s = opaque;
	s->invalidate = 1;
	}

	static void vgafb_resize(MilkymistVgafbState *s)
	{
	if (!vgafb_enabled(s)) {
	return;
	}

	qemu_console_resize(s->ds, s->regs[R_HRES], s->regs[R_VRES]);
	s->invalidate = 1;
	}

	static uint32_t vgafb_read(void *opaque, target_phys_addr_t addr)
	{
	MilkymistVgafbState *s = opaque;
	uint32_t r = 0;

	addr >>= 2;
	switch (addr) {
	case R_CTRL:
	case R_HRES:
	case R_HSYNC_START:
	case R_HSYNC_END:
	case R_HSCAN:
	case R_VRES:
	case R_VSYNC_START:
	case R_VSYNC_END:
	case R_VSCAN:
	case R_BASEADDRESS:
	case R_BURST_COUNT:
	case R_SOURCE_CLOCK:
	r = s->regs[addr];
	break;
	case R_BASEADDRESS_ACT:
	r = s->regs[R_BASEADDRESS];
	break;

	default:
	error_report("milkymist_vgafb: read access to unknown register 0x"
	TARGET_FMT_plx, addr << 2);
	break;
	}

	trace_milkymist_vgafb_memory_read(addr << 2, r);

	return r;
	}

	static void
	vgafb_write(void *opaque, target_phys_addr_t addr, uint32_t value)
	{
	MilkymistVgafbState *s = opaque;

	trace_milkymist_vgafb_memory_write(addr, value);

	addr >>= 2;
	switch (addr) {
	case R_CTRL:
	case R_HSYNC_START:
	case R_HSYNC_END:
	case R_HSCAN:
	case R_VSYNC_START:
	case R_VSYNC_END:
	case R_VSCAN:
	case R_BURST_COUNT:
	case R_SOURCE_CLOCK:
	s->regs[addr] = value;
	break;
	case R_BASEADDRESS:
	if (value & 0x1f) {
	error_report("milkymist_vgafb: framebuffer base address have to "
	"be 32 byte aligned");
	break;
	}
	s->regs[addr] = value & s->fb_mask;
	s->invalidate = 1;
	break;
	case R_HRES:
	case R_VRES:
	s->regs[addr] = value;
	vgafb_resize(s);
	break;
	case R_BASEADDRESS_ACT:
	error_report("milkymist_vgafb: write to read-only register 0x"
	TARGET_FMT_plx, addr << 2);
	break;

	default:
	error_report("milkymist_vgafb: write access to unknown register 0x"
	TARGET_FMT_plx, addr << 2);
	break;
	}
	}

	static CPUReadMemoryFunc * const vgafb_read_fn[] = {
	NULL,
	NULL,
	&vgafb_read
	};

	static CPUWriteMemoryFunc * const vgafb_write_fn[] = {
	NULL,
	NULL,
	&vgafb_write
	};

	static void milkymist_vgafb_reset(DeviceState *d)
	{
	MilkymistVgafbState *s = container_of(d, MilkymistVgafbState, busdev.qdev);
	int i;

	for (i = 0; i < R_MAX; i++) {
	s->regs[i] = 0;
	}

	/* defaults */
	s->regs[R_CTRL] = CTRL_RESET;
	s->regs[R_HRES] = 640;
	s->regs[R_VRES] = 480;
	s->regs[R_BASEADDRESS] = 0;
	}

	static int milkymist_vgafb_init(SysBusDevice *dev)
	{
	MilkymistVgafbState s = FROM_SYSBUS(typeof(s), dev);
	int vgafb_regs;

	vgafb_regs = cpu_register_io_memory(vgafb_read_fn, vgafb_write_fn, s,
	DEVICE_NATIVE_ENDIAN);
	sysbus_init_mmio(dev, R_MAX * 4, vgafb_regs);

	s->ds = graphic_console_init(vgafb_update_display,
	vgafb_invalidate_display,
	NULL, NULL, s);

	return 0;
	}

	static int vgafb_post_load(void *opaque, int version_id)
	{
	vgafb_invalidate_display(opaque);
	return 0;
	}

	static const VMStateDescription vmstate_milkymist_vgafb = {
	.name = "milkymist-vgafb",
	.version_id = 1,
	.minimum_version_id = 1,
	.minimum_version_id_old = 1,
	.post_load = vgafb_post_load,
	.fields = (VMStateField[]) {
	VMSTATE_UINT32_ARRAY(regs, MilkymistVgafbState, R_MAX),
	VMSTATE_END_OF_LIST()
	}
	};

	static SysBusDeviceInfo milkymist_vgafb_info = {
	.init = milkymist_vgafb_init,
	.qdev.name = "milkymist-vgafb",
	.qdev.size = sizeof(MilkymistVgafbState),
	.qdev.vmsd = &vmstate_milkymist_vgafb,
	.qdev.reset = milkymist_vgafb_reset,
	.qdev.props = (Property[]) {
	DEFINE_PROP_UINT32("fb_offset", MilkymistVgafbState, fb_offset, 0x0),
	DEFINE_PROP_UINT32("fb_mask", MilkymistVgafbState, fb_mask, 0xffffffff),
	DEFINE_PROP_END_OF_LIST(),
	}
	};

	static void milkymist_vgafb_register(void)
	{
	sysbus_register_withprop(&milkymist_vgafb_info);
	}

	device_init(milkymist_vgafb_register)