[qemu.git] / hw / milkymist-vgafb.c


/*
 *  QEMU model of the Milkymist VGA framebuffer.
 *
 *  Copyright (c) 2010 Michael Walle <[email protected]>
 *
 * 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:
        s->regs[addr] = value;
        vgafb_resize(s);
        break;
    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)
Commit	Line	Data
d23948b1 MW	1
	2	/*
	3	* QEMU model of the Milkymist VGA framebuffer.
	4	*
	5	* Copyright (c) 2010 Michael Walle <[email protected]>
	6	*
	7	* This library is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2 of the License, or (at your option) any later version.
	11	*
	12	* This library is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
	19	*
	20	*
	21	* Specification available at:
	22	* http://www.milkymist.org/socdoc/vgafb.pdf
	23	*/
	24
	25	#include "hw.h"
	26	#include "sysbus.h"
	27	#include "trace.h"
	28	#include "console.h"
	29	#include "framebuffer.h"
	30	#include "pixel_ops.h"
	31	#include "qemu-error.h"
	32
	33	#define BITS 8
	34	#include "milkymist-vgafb_template.h"
	35	#define BITS 15
	36	#include "milkymist-vgafb_template.h"
	37	#define BITS 16
	38	#include "milkymist-vgafb_template.h"
	39	#define BITS 24
	40	#include "milkymist-vgafb_template.h"
	41	#define BITS 32
	42	#include "milkymist-vgafb_template.h"
	43
	44	enum {
	45	R_CTRL = 0,
	46	R_HRES,
	47	R_HSYNC_START,
	48	R_HSYNC_END,
	49	R_HSCAN,
	50	R_VRES,
	51	R_VSYNC_START,
	52	R_VSYNC_END,
	53	R_VSCAN,
	54	R_BASEADDRESS,
	55	R_BASEADDRESS_ACT,
	56	R_BURST_COUNT,
	57	R_SOURCE_CLOCK,
	58	R_MAX
	59	};
	60
	61	enum {
	62	CTRL_RESET = (1<<0),
	63	};
	64
65	struct MilkymistVgafbState {
66	SysBusDevice busdev;
67	DisplayState *ds;
68
69	int invalidate;
70	uint32_t fb_offset;
71	uint32_t fb_mask;
72
73	uint32_t regs[R_MAX];
74	};
75	typedef struct MilkymistVgafbState MilkymistVgafbState;
76
77	static int vgafb_enabled(MilkymistVgafbState *s)
78	{
79	return !(s->regs[R_CTRL] & CTRL_RESET);
80	}
81
82	static void vgafb_update_display(void *opaque)
83	{
84	MilkymistVgafbState *s = opaque;
85	int first = 0;
86	int last = 0;
87	drawfn fn;
88
89	if (!vgafb_enabled(s)) {
90	return;
91	}
92
93	int dest_width = s->regs[R_HRES];
94
95	switch (ds_get_bits_per_pixel(s->ds)) {
96	case 0:
97	return;
98	case 8:
99	fn = draw_line_8;
100	break;
101	case 15:
102	fn = draw_line_15;
103	dest_width *= 2;
104	break;
105	case 16:
106	fn = draw_line_16;
107	dest_width *= 2;
108	break;
109	case 24:
110	fn = draw_line_24;
111	dest_width *= 3;
112	break;
113	case 32:
114	fn = draw_line_32;
115	dest_width *= 4;
116	break;
117	default:
118	hw_error("milkymist_vgafb: bad color depth\n");
119	break;
120	}
121
122	framebuffer_update_display(s->ds,
123	s->regs[R_BASEADDRESS] + s->fb_offset,
124	s->regs[R_HRES],
125	s->regs[R_VRES],
126	s->regs[R_HRES] * 2,
127	dest_width,
128	0,
129	s->invalidate,
130	fn,
131	NULL,
132	&first, &last);
133
134	if (first >= 0) {
135	dpy_update(s->ds, 0, first, s->regs[R_HRES], last - first + 1);
136	}
137	s->invalidate = 0;
138	}
139
140	static void vgafb_invalidate_display(void *opaque)
141	{
142	MilkymistVgafbState *s = opaque;
143	s->invalidate = 1;
144	}
145
146	static void vgafb_resize(MilkymistVgafbState *s)
147	{
148	if (!vgafb_enabled(s)) {
149	return;
150	}
151
152	qemu_console_resize(s->ds, s->regs[R_HRES], s->regs[R_VRES]);
153	s->invalidate = 1;
154	}
155
156	static uint32_t vgafb_read(void *opaque, target_phys_addr_t addr)
157	{
158	MilkymistVgafbState *s = opaque;
159	uint32_t r = 0;
160
161	addr >>= 2;
162	switch (addr) {
163	case R_CTRL:
164	case R_HRES:
165	case R_HSYNC_START:
166	case R_HSYNC_END:
167	case R_HSCAN:
168	case R_VRES:
169	case R_VSYNC_START:
170	case R_VSYNC_END:
171	case R_VSCAN:
172	case R_BASEADDRESS:
173	case R_BURST_COUNT:
174	case R_SOURCE_CLOCK:
175	r = s->regs[addr];
176	break;
177	case R_BASEADDRESS_ACT:
178	r = s->regs[R_BASEADDRESS];
179	break;
180
181	default:
182	error_report("milkymist_vgafb: read access to unknown register 0x"
183	TARGET_FMT_plx, addr << 2);
184	break;
185	}
186
187	trace_milkymist_vgafb_memory_read(addr << 2, r);
188
189	return r;
190	}
191
192	static void
193	vgafb_write(void *opaque, target_phys_addr_t addr, uint32_t value)
194	{
195	MilkymistVgafbState *s = opaque;
196
197	trace_milkymist_vgafb_memory_write(addr, value);
198
199	addr >>= 2;
200	switch (addr) {
201	case R_CTRL:
c07050dd MW	202	s->regs[addr] = value;
	203	vgafb_resize(s);
	204	break;
d23948b1 MW	205	case R_HSYNC_START:
	206	case R_HSYNC_END:
	207	case R_HSCAN:
	208	case R_VSYNC_START:
	209	case R_VSYNC_END:
	210	case R_VSCAN:
	211	case R_BURST_COUNT:
	212	case R_SOURCE_CLOCK:
	213	s->regs[addr] = value;
	214	break;
	215	case R_BASEADDRESS:
	216	if (value & 0x1f) {
	217	error_report("milkymist_vgafb: framebuffer base address have to "
	218	"be 32 byte aligned");
	219	break;
	220	}
	221	s->regs[addr] = value & s->fb_mask;
	222	s->invalidate = 1;
	223	break;
	224	case R_HRES:
	225	case R_VRES:
	226	s->regs[addr] = value;
	227	vgafb_resize(s);
	228	break;
	229	case R_BASEADDRESS_ACT:
	230	error_report("milkymist_vgafb: write to read-only register 0x"
	231	TARGET_FMT_plx, addr << 2);
	232	break;
	233
	234	default:
	235	error_report("milkymist_vgafb: write access to unknown register 0x"
	236	TARGET_FMT_plx, addr << 2);
	237	break;
	238	}
	239	}
	240
	241	static CPUReadMemoryFunc * const vgafb_read_fn[] = {
	242	NULL,
	243	NULL,
	244	&vgafb_read
	245	};
	246
	247	static CPUWriteMemoryFunc * const vgafb_write_fn[] = {
	248	NULL,
	249	NULL,
	250	&vgafb_write
	251	};
	252
	253	static void milkymist_vgafb_reset(DeviceState *d)
	254	{
	255	MilkymistVgafbState *s = container_of(d, MilkymistVgafbState, busdev.qdev);
	256	int i;
	257
	258	for (i = 0; i < R_MAX; i++) {
	259	s->regs[i] = 0;
	260	}
	261
	262	/* defaults */
	263	s->regs[R_CTRL] = CTRL_RESET;
	264	s->regs[R_HRES] = 640;
	265	s->regs[R_VRES] = 480;
	266	s->regs[R_BASEADDRESS] = 0;
	267	}
	268
269	static int milkymist_vgafb_init(SysBusDevice *dev)
270	{
271	MilkymistVgafbState s = FROM_SYSBUS(typeof(s), dev);
272	int vgafb_regs;
273
274	vgafb_regs = cpu_register_io_memory(vgafb_read_fn, vgafb_write_fn, s,
275	DEVICE_NATIVE_ENDIAN);
276	sysbus_init_mmio(dev, R_MAX * 4, vgafb_regs);
277
278	s->ds = graphic_console_init(vgafb_update_display,
279	vgafb_invalidate_display,
280	NULL, NULL, s);
281
282	return 0;
283	}
284
285	static int vgafb_post_load(void *opaque, int version_id)
286	{
287	vgafb_invalidate_display(opaque);
288	return 0;
289	}
290
291	static const VMStateDescription vmstate_milkymist_vgafb = {
292	.name = "milkymist-vgafb",
293	.version_id = 1,
294	.minimum_version_id = 1,
295	.minimum_version_id_old = 1,
296	.post_load = vgafb_post_load,
297	.fields = (VMStateField[]) {
298	VMSTATE_UINT32_ARRAY(regs, MilkymistVgafbState, R_MAX),
299	VMSTATE_END_OF_LIST()
300	}
301	};
302
303	static SysBusDeviceInfo milkymist_vgafb_info = {
304	.init = milkymist_vgafb_init,
305	.qdev.name = "milkymist-vgafb",
306	.qdev.size = sizeof(MilkymistVgafbState),
307	.qdev.vmsd = &vmstate_milkymist_vgafb,
308	.qdev.reset = milkymist_vgafb_reset,
309	.qdev.props = (Property[]) {
310	DEFINE_PROP_UINT32("fb_offset", MilkymistVgafbState, fb_offset, 0x0),
311	DEFINE_PROP_UINT32("fb_mask", MilkymistVgafbState, fb_mask, 0xffffffff),
312	DEFINE_PROP_END_OF_LIST(),
313	}
314	};
315
316	static void milkymist_vgafb_register(void)
317	{
318	sysbus_register_withprop(&milkymist_vgafb_info);
319	}
320
321	device_init(milkymist_vgafb_register)