Loading...
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 | // 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_WARN("Cannot request framebuffer, boot fb still active?\n");
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);
}
|