1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
*/
#include <linux/pci.h>
#include <drm/drm_drv.h>
#include <drm/drm_fourcc.h>
#include "bochs.h"
/* ---------------------------------------------------------------------- */
static void bochs_vga_writeb(struct bochs_device *bochs, u16 ioport, u8 val)
{
if (WARN_ON(ioport < 0x3c0 || ioport > 0x3df))
return;
if (bochs->mmio) {
int offset = ioport - 0x3c0 + 0x400;
writeb(val, bochs->mmio + offset);
} else {
outb(val, ioport);
}
}
static u16 bochs_dispi_read(struct bochs_device *bochs, u16 reg)
{
u16 ret = 0;
if (bochs->mmio) {
int offset = 0x500 + (reg << 1);
ret = readw(bochs->mmio + offset);
} else {
outw(reg, VBE_DISPI_IOPORT_INDEX);
ret = inw(VBE_DISPI_IOPORT_DATA);
}
return ret;
}
static void bochs_dispi_write(struct bochs_device *bochs, u16 reg, u16 val)
{
if (bochs->mmio) {
int offset = 0x500 + (reg << 1);
writew(val, bochs->mmio + offset);
} else {
outw(reg, VBE_DISPI_IOPORT_INDEX);
outw(val, VBE_DISPI_IOPORT_DATA);
}
}
static void bochs_hw_set_big_endian(struct bochs_device *bochs)
{
if (bochs->qext_size < 8)
return;
writel(0xbebebebe, bochs->mmio + 0x604);
}
static void bochs_hw_set_little_endian(struct bochs_device *bochs)
{
if (bochs->qext_size < 8)
return;
writel(0x1e1e1e1e, bochs->mmio + 0x604);
}
#ifdef __BIG_ENDIAN
#define bochs_hw_set_native_endian(_b) bochs_hw_set_big_endian(_b)
#else
#define bochs_hw_set_native_endian(_b) bochs_hw_set_little_endian(_b)
#endif
static int bochs_get_edid_block(void *data, u8 *buf,
unsigned int block, size_t len)
{
struct bochs_device *bochs = data;
size_t i, start = block * EDID_LENGTH;
if (start + len > 0x400 /* vga register offset */)
return -1;
for (i = 0; i < len; i++) {
buf[i] = readb(bochs->mmio + start + i);
}
return 0;
}
int bochs_hw_load_edid(struct bochs_device *bochs)
{
u8 header[8];
if (!bochs->mmio)
return -1;
/* check header to detect whenever edid support is enabled in qemu */
bochs_get_edid_block(bochs, header, 0, ARRAY_SIZE(header));
if (drm_edid_header_is_valid(header) != 8)
return -1;
kfree(bochs->edid);
bochs->edid = drm_do_get_edid(&bochs->connector,
bochs_get_edid_block, bochs);
if (bochs->edid == NULL)
return -1;
return 0;
}
int bochs_hw_init(struct drm_device *dev)
{
struct bochs_device *bochs = dev->dev_private;
struct pci_dev *pdev = dev->pdev;
unsigned long addr, size, mem, ioaddr, iosize;
u16 id;
if (pdev->resource[2].flags & IORESOURCE_MEM) {
/* mmio bar with vga and bochs registers present */
if (pci_request_region(pdev, 2, "bochs-drm") != 0) {
DRM_ERROR("Cannot request mmio region\n");
return -EBUSY;
}
ioaddr = pci_resource_start(pdev, 2);
iosize = pci_resource_len(pdev, 2);
bochs->mmio = ioremap(ioaddr, iosize);
if (bochs->mmio == NULL) {
DRM_ERROR("Cannot map mmio region\n");
return -ENOMEM;
}
} else {
ioaddr = VBE_DISPI_IOPORT_INDEX;
iosize = 2;
if (!request_region(ioaddr, iosize, "bochs-drm")) {
DRM_ERROR("Cannot request ioports\n");
return -EBUSY;
}
bochs->ioports = 1;
}
id = bochs_dispi_read(bochs, VBE_DISPI_INDEX_ID);
mem = bochs_dispi_read(bochs, VBE_DISPI_INDEX_VIDEO_MEMORY_64K)
* 64 * 1024;
if ((id & 0xfff0) != VBE_DISPI_ID0) {
DRM_ERROR("ID mismatch\n");
return -ENODEV;
}
if ((pdev->resource[0].flags & IORESOURCE_MEM) == 0)
return -ENODEV;
addr = pci_resource_start(pdev, 0);
size = pci_resource_len(pdev, 0);
if (addr == 0)
return -ENODEV;
if (size != mem) {
DRM_ERROR("Size mismatch: pci=%ld, bochs=%ld\n",
size, mem);
size = min(size, mem);
}
if (pci_request_region(pdev, 0, "bochs-drm") != 0) {
DRM_ERROR("Cannot request framebuffer\n");
return -EBUSY;
}
bochs->fb_map = ioremap(addr, size);
if (bochs->fb_map == NULL) {
DRM_ERROR("Cannot map framebuffer\n");
return -ENOMEM;
}
bochs->fb_base = addr;
bochs->fb_size = size;
DRM_INFO("Found bochs VGA, ID 0x%x.\n", id);
DRM_INFO("Framebuffer size %ld kB @ 0x%lx, %s @ 0x%lx.\n",
size / 1024, addr,
bochs->ioports ? "ioports" : "mmio",
ioaddr);
if (bochs->mmio && pdev->revision >= 2) {
bochs->qext_size = readl(bochs->mmio + 0x600);
if (bochs->qext_size < 4 || bochs->qext_size > iosize) {
bochs->qext_size = 0;
goto noext;
}
DRM_DEBUG("Found qemu ext regs, size %ld\n",
bochs->qext_size);
bochs_hw_set_native_endian(bochs);
}
noext:
return 0;
}
void bochs_hw_fini(struct drm_device *dev)
{
struct bochs_device *bochs = dev->dev_private;
/* TODO: shot down existing vram mappings */
if (bochs->mmio)
iounmap(bochs->mmio);
if (bochs->ioports)
release_region(VBE_DISPI_IOPORT_INDEX, 2);
if (bochs->fb_map)
iounmap(bochs->fb_map);
pci_release_regions(dev->pdev);
kfree(bochs->edid);
}
void bochs_hw_setmode(struct bochs_device *bochs,
struct drm_display_mode *mode)
{
int idx;
if (!drm_dev_enter(bochs->dev, &idx))
return;
bochs->xres = mode->hdisplay;
bochs->yres = mode->vdisplay;
bochs->bpp = 32;
bochs->stride = mode->hdisplay * (bochs->bpp / 8);
bochs->yres_virtual = bochs->fb_size / bochs->stride;
DRM_DEBUG_DRIVER("%dx%d @ %d bpp, vy %d\n",
bochs->xres, bochs->yres, bochs->bpp,
bochs->yres_virtual);
bochs_vga_writeb(bochs, 0x3c0, 0x20); /* unblank */
bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE, 0);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_BPP, bochs->bpp);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_XRES, bochs->xres);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_YRES, bochs->yres);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_BANK, 0);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_VIRT_WIDTH, bochs->xres);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_VIRT_HEIGHT,
bochs->yres_virtual);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_X_OFFSET, 0);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_Y_OFFSET, 0);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE,
VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED);
drm_dev_exit(idx);
}
void bochs_hw_setformat(struct bochs_device *bochs,
const struct drm_format_info *format)
{
int idx;
if (!drm_dev_enter(bochs->dev, &idx))
return;
DRM_DEBUG_DRIVER("format %c%c%c%c\n",
(format->format >> 0) & 0xff,
(format->format >> 8) & 0xff,
(format->format >> 16) & 0xff,
(format->format >> 24) & 0xff);
switch (format->format) {
case DRM_FORMAT_XRGB8888:
bochs_hw_set_little_endian(bochs);
break;
case DRM_FORMAT_BGRX8888:
bochs_hw_set_big_endian(bochs);
break;
default:
/* should not happen */
DRM_ERROR("%s: Huh? Got framebuffer format 0x%x",
__func__, format->format);
break;
}
drm_dev_exit(idx);
}
void bochs_hw_setbase(struct bochs_device *bochs,
int x, int y, int stride, u64 addr)
{
unsigned long offset;
unsigned int vx, vy, vwidth, idx;
if (!drm_dev_enter(bochs->dev, &idx))
return;
bochs->stride = stride;
offset = (unsigned long)addr +
y * bochs->stride +
x * (bochs->bpp / 8);
vy = offset / bochs->stride;
vx = (offset % bochs->stride) * 8 / bochs->bpp;
vwidth = stride * 8 / bochs->bpp;
DRM_DEBUG_DRIVER("x %d, y %d, addr %llx -> offset %lx, vx %d, vy %d\n",
x, y, addr, offset, vx, vy);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_VIRT_WIDTH, vwidth);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_X_OFFSET, vx);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_Y_OFFSET, vy);
drm_dev_exit(idx);
}
|
