git.stricted.de - GitHub/exynos8895/android_kernel_samsung

1 /*

2 * linux/drivers/video/hgafb.c -- Hercules graphics adaptor frame buffer device

3 *

4 * Created 25 Nov 1999 by Ferenc Bakonyi (fero@drama.obuda.kando.hu)

5 * Based on skeletonfb.c by Geert Uytterhoeven and

6 * mdacon.c by Andrew Apted

7 *

8 * History:

9 *

10 * - Revision 0.1.8 (23 Oct 2002): Ported to new framebuffer api.

11 *

12 * - Revision 0.1.7 (23 Jan 2001): fix crash resulting from MDA only cards

13 * being detected as Hercules. (Paul G.)

14 * - Revision 0.1.6 (17 Aug 2000): new style structs

15 * documentation

16 * - Revision 0.1.5 (13 Mar 2000): spinlocks instead of saveflags();cli();etc

17 * minor fixes

18 * - Revision 0.1.4 (24 Jan 2000): fixed a bug in hga_card_detect() for

19 * HGA-only systems

20 * - Revision 0.1.3 (22 Jan 2000): modified for the new fb_info structure

21 * screen is cleared after rmmod

22 * virtual resolutions

23 * module parameter 'nologo={0|1}'

24 * the most important: boot logo :)

25 * - Revision 0.1.0 (6 Dec 1999): faster scrolling and minor fixes

26 * - First release (25 Nov 1999)

27 *

28 * This file is subject to the terms and conditions of the GNU General Public

29 * License. See the file COPYING in the main directory of this archive

30 * for more details.

31 */

33 #include <linux/module.h>

34 #include <linux/kernel.h>

35 #include <linux/errno.h>

36 #include <linux/spinlock.h>

37 #include <linux/string.h>

38 #include <linux/mm.h>

39 #include <linux/delay.h>

40 #include <linux/fb.h>

41 #include <linux/init.h>

42 #include <linux/ioport.h>

43 #include <linux/platform_device.h>

44 #include <asm/io.h>

45 #include <asm/vga.h>

47 #if 0

48 #define DPRINTK(args...) printk(KERN_DEBUG __FILE__": " ##args)

49 #else

50 #define DPRINTK(args...)

51 #endif

53 #if 0

54 #define CHKINFO(ret) if (info != &fb_info) { printk(KERN_DEBUG __FILE__": This should never happen, line:%d \n", __LINE__); return ret; }

55 #else

56 #define CHKINFO(ret)

57 #endif

59 /* Description of the hardware layout */

61 static void __iomem *hga_vram; /* Base of video memory */

62 static unsigned long hga_vram_len; /* Size of video memory */

64 #define HGA_ROWADDR(row) ((row%4)*8192 + (row>>2)*90)

65 #define HGA_TXT 0

66 #define HGA_GFX 1

68 static inline u8 __iomem * rowaddr(struct fb_info *info, u_int row)

69 {

70 return info->screen_base + HGA_ROWADDR(row);

71 }

73 static int hga_mode = -1; /* 0 = txt, 1 = gfx mode */

75 static enum { TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } hga_type;

76 static char *hga_type_name;

78 #define HGA_INDEX_PORT 0x3b4 /* Register select port */

79 #define HGA_VALUE_PORT 0x3b5 /* Register value port */

80 #define HGA_MODE_PORT 0x3b8 /* Mode control port */

81 #define HGA_STATUS_PORT 0x3ba /* Status and Config port */

82 #define HGA_GFX_PORT 0x3bf /* Graphics control port */

84 /* HGA register values */

86 #define HGA_CURSOR_BLINKING 0x00

87 #define HGA_CURSOR_OFF 0x20

88 #define HGA_CURSOR_SLOWBLINK 0x60

90 #define HGA_MODE_GRAPHICS 0x02

91 #define HGA_MODE_VIDEO_EN 0x08

92 #define HGA_MODE_BLINK_EN 0x20

93 #define HGA_MODE_GFX_PAGE1 0x80

95 #define HGA_STATUS_HSYNC 0x01

96 #define HGA_STATUS_VSYNC 0x80

97 #define HGA_STATUS_VIDEO 0x08

99 #define HGA_CONFIG_COL132 0x08

100 #define HGA_GFX_MODE_EN 0x01

101 #define HGA_GFX_PAGE_EN 0x02

102

103 /* Global locks */

104

105 static DEFINE_SPINLOCK(hga_reg_lock);

106

107 /* Framebuffer driver structures */

108

109 static struct fb_var_screeninfo hga_default_var __devinitdata = {

110 .xres = 720,

111 .yres = 348,

112 .xres_virtual = 720,

113 .yres_virtual = 348,

114 .bits_per_pixel = 1,

115 .red = {0, 1, 0},

116 .green = {0, 1, 0},

117 .blue = {0, 1, 0},

118 .transp = {0, 0, 0},

119 .height = -1,

120 .width = -1,

121 };

122

123 static struct fb_fix_screeninfo hga_fix __devinitdata = {

124 .id = "HGA",

125 .type = FB_TYPE_PACKED_PIXELS, /* (not sure) */

126 .visual = FB_VISUAL_MONO10,

127 .xpanstep = 8,

128 .ypanstep = 8,

129 .line_length = 90,

130 .accel = FB_ACCEL_NONE

131 };

132

133 /* Don't assume that tty1 will be the initial current console. */

134 static int release_io_port = 0;

135 static int release_io_ports = 0;

136 static int nologo = 0;

137

138 /* -------------------------------------------------------------------------

139 *

140 * Low level hardware functions

141 *

142 * ------------------------------------------------------------------------- */

143

144 static void write_hga_b(unsigned int val, unsigned char reg)

145 {

146 outb_p(reg, HGA_INDEX_PORT);

147 outb_p(val, HGA_VALUE_PORT);

148 }

149

150 static void write_hga_w(unsigned int val, unsigned char reg)

151 {

152 outb_p(reg, HGA_INDEX_PORT); outb_p(val >> 8, HGA_VALUE_PORT);

153 outb_p(reg+1, HGA_INDEX_PORT); outb_p(val & 0xff, HGA_VALUE_PORT);

154 }

155

156 static int test_hga_b(unsigned char val, unsigned char reg)

157 {

158 outb_p(reg, HGA_INDEX_PORT);

159 outb (val, HGA_VALUE_PORT);

160 udelay(20); val = (inb_p(HGA_VALUE_PORT) == val);

161 return val;

162 }

163

164 static void hga_clear_screen(void)

165 {

166 unsigned char fillchar = 0xbf; /* magic */

167 unsigned long flags;

168

169 spin_lock_irqsave(&hga_reg_lock, flags);

170 if (hga_mode == HGA_TXT)

171 fillchar = ' ';

172 else if (hga_mode == HGA_GFX)

173 fillchar = 0x00;

174 spin_unlock_irqrestore(&hga_reg_lock, flags);

175 if (fillchar != 0xbf)

176 memset_io(hga_vram, fillchar, hga_vram_len);

177 }

178

179 static void hga_txt_mode(void)

180 {

181 unsigned long flags;

182

183 spin_lock_irqsave(&hga_reg_lock, flags);

184 outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_BLINK_EN, HGA_MODE_PORT);

185 outb_p(0x00, HGA_GFX_PORT);

186 outb_p(0x00, HGA_STATUS_PORT);

187

188 write_hga_b(0x61, 0x00); /* horizontal total */

189 write_hga_b(0x50, 0x01); /* horizontal displayed */

190 write_hga_b(0x52, 0x02); /* horizontal sync pos */

191 write_hga_b(0x0f, 0x03); /* horizontal sync width */

192

193 write_hga_b(0x19, 0x04); /* vertical total */

194 write_hga_b(0x06, 0x05); /* vertical total adjust */

195 write_hga_b(0x19, 0x06); /* vertical displayed */

196 write_hga_b(0x19, 0x07); /* vertical sync pos */

197

198 write_hga_b(0x02, 0x08); /* interlace mode */

199 write_hga_b(0x0d, 0x09); /* maximum scanline */

200 write_hga_b(0x0c, 0x0a); /* cursor start */

201 write_hga_b(0x0d, 0x0b); /* cursor end */

202

203 write_hga_w(0x0000, 0x0c); /* start address */

204 write_hga_w(0x0000, 0x0e); /* cursor location */

205

206 hga_mode = HGA_TXT;

207 spin_unlock_irqrestore(&hga_reg_lock, flags);

208 }

209

210 static void hga_gfx_mode(void)

211 {

212 unsigned long flags;

213

214 spin_lock_irqsave(&hga_reg_lock, flags);

215 outb_p(0x00, HGA_STATUS_PORT);

216 outb_p(HGA_GFX_MODE_EN, HGA_GFX_PORT);

217 outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);

218

219 write_hga_b(0x35, 0x00); /* horizontal total */

220 write_hga_b(0x2d, 0x01); /* horizontal displayed */

221 write_hga_b(0x2e, 0x02); /* horizontal sync pos */

222 write_hga_b(0x07, 0x03); /* horizontal sync width */

223

224 write_hga_b(0x5b, 0x04); /* vertical total */

225 write_hga_b(0x02, 0x05); /* vertical total adjust */

226 write_hga_b(0x57, 0x06); /* vertical displayed */

227 write_hga_b(0x57, 0x07); /* vertical sync pos */

228

229 write_hga_b(0x02, 0x08); /* interlace mode */

230 write_hga_b(0x03, 0x09); /* maximum scanline */

231 write_hga_b(0x00, 0x0a); /* cursor start */

232 write_hga_b(0x00, 0x0b); /* cursor end */

233

234 write_hga_w(0x0000, 0x0c); /* start address */

235 write_hga_w(0x0000, 0x0e); /* cursor location */

236

237 hga_mode = HGA_GFX;

238 spin_unlock_irqrestore(&hga_reg_lock, flags);

239 }

240

241 static void hga_show_logo(struct fb_info *info)

242 {

243 /*

244 void __iomem *dest = hga_vram;

245 char *logo = linux_logo_bw;

246 int x, y;

247

248 for (y = 134; y < 134 + 80 ; y++) * this needs some cleanup *

249 for (x = 0; x < 10 ; x++)

250 writeb(~*(logo++),(dest + HGA_ROWADDR(y) + x + 40));

251 */

252 }

253

254 static void hga_pan(unsigned int xoffset, unsigned int yoffset)

255 {

256 unsigned int base;

257 unsigned long flags;

258

259 base = (yoffset / 8) * 90 + xoffset;

260 spin_lock_irqsave(&hga_reg_lock, flags);

261 write_hga_w(base, 0x0c); /* start address */

262 spin_unlock_irqrestore(&hga_reg_lock, flags);

263 DPRINTK("hga_pan: base:%d\n", base);

264 }

265

266 static void hga_blank(int blank_mode)

267 {

268 unsigned long flags;

269

270 spin_lock_irqsave(&hga_reg_lock, flags);

271 if (blank_mode) {

272 outb_p(0x00, HGA_MODE_PORT); /* disable video */

273 } else {

274 outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);

275 }

276 spin_unlock_irqrestore(&hga_reg_lock, flags);

277 }

278

279 static int __devinit hga_card_detect(void)

280 {

281 int count = 0;

282 void __iomem *p, *q;

283 unsigned short p_save, q_save;

284

285 hga_vram_len = 0x08000;

286

287 hga_vram = ioremap(0xb0000, hga_vram_len);

288

289 if (request_region(0x3b0, 12, "hgafb"))

290 release_io_ports = 1;

291 if (request_region(0x3bf, 1, "hgafb"))

292 release_io_port = 1;

293

294 /* do a memory check */

295

296 p = hga_vram;

297 q = hga_vram + 0x01000;

298

299 p_save = readw(p); q_save = readw(q);

300

301 writew(0xaa55, p); if (readw(p) == 0xaa55) count++;

302 writew(0x55aa, p); if (readw(p) == 0x55aa) count++;

303 writew(p_save, p);

304

305 if (count != 2)

306 goto error;

307

308 /* Ok, there is definitely a card registering at the correct

309 * memory location, so now we do an I/O port test.

310 */

311

312 if (!test_hga_b(0x66, 0x0f)) /* cursor low register */

313 goto error;

314

315 if (!test_hga_b(0x99, 0x0f)) /* cursor low register */

316 goto error;

317

318 /* See if the card is a Hercules, by checking whether the vsync

319 * bit of the status register is changing. This test lasts for

320 * approximately 1/10th of a second.

321 */

322

323 p_save = q_save = inb_p(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;

324

325 for (count=0; count < 50000 && p_save == q_save; count++) {

326 q_save = inb(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;

327 udelay(2);

328 }

329

330 if (p_save == q_save)

331 goto error;

332

333 switch (inb_p(HGA_STATUS_PORT) & 0x70) {

334 case 0x10:

335 hga_type = TYPE_HERCPLUS;

336 hga_type_name = "HerculesPlus";

337 break;

338 case 0x50:

339 hga_type = TYPE_HERCCOLOR;

340 hga_type_name = "HerculesColor";

341 break;

342 default:

343 hga_type = TYPE_HERC;

344 hga_type_name = "Hercules";

345 break;

346 }

347 return 1;

348 error:

349 if (release_io_ports)

350 release_region(0x3b0, 12);

351 if (release_io_port)

352 release_region(0x3bf, 1);

353 return 0;

354 }

355

356 /**

357 * hgafb_open - open the framebuffer device

358 * @info:pointer to fb_info object containing info for current hga board

359 * @int:open by console system or userland.

360 */

361

362 static int hgafb_open(struct fb_info *info, int init)

363 {

364 hga_gfx_mode();

365 hga_clear_screen();

366 if (!nologo) hga_show_logo(info);

367 return 0;

368 }

369

370 /**

371 * hgafb_open - open the framebuffer device

372 * @info:pointer to fb_info object containing info for current hga board

373 * @int:open by console system or userland.

374 */

375

376 static int hgafb_release(struct fb_info *info, int init)

377 {

378 hga_txt_mode();

379 hga_clear_screen();

380 return 0;

381 }

382

383 /**

384 * hgafb_setcolreg - set color registers

385 * @regno:register index to set

386 * @red:red value, unused

387 * @green:green value, unused

388 * @blue:blue value, unused

389 * @transp:transparency value, unused

390 * @info:unused

391 *

392 * This callback function is used to set the color registers of a HGA

393 * board. Since we have only two fixed colors only @regno is checked.

394 * A zero is returned on success and 1 for failure.

395 */

396

397 static int hgafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,

398 u_int transp, struct fb_info *info)

399 {

400 if (regno > 1)

401 return 1;

402 return 0;

403 }

404

405 /**

406 * hga_pan_display - pan or wrap the display

407 * @var:contains new xoffset, yoffset and vmode values

408 * @info:pointer to fb_info object containing info for current hga board

409 *

410 * This function looks only at xoffset, yoffset and the %FB_VMODE_YWRAP

411 * flag in @var. If input parameters are correct it calls hga_pan() to

412 * program the hardware. @info->var is updated to the new values.

413 * A zero is returned on success and %-EINVAL for failure.

414 */

415

416 static int hgafb_pan_display(struct fb_var_screeninfo *var,

417 struct fb_info *info)

418 {

419 if (var->vmode & FB_VMODE_YWRAP) {

420 if (var->yoffset < 0 ||

421 var->yoffset >= info->var.yres_virtual ||

422 var->xoffset)

423 return -EINVAL;

424 } else {

425 if (var->xoffset + info->var.xres > info->var.xres_virtual

426 || var->yoffset + info->var.yres > info->var.yres_virtual

427 || var->yoffset % 8)

428 return -EINVAL;

429 }

430

431 hga_pan(var->xoffset, var->yoffset);

432 return 0;

433 }

434

435 /**

436 * hgafb_blank - (un)blank the screen

437 * @blank_mode:blanking method to use

438 * @info:unused

439 *

440 * Blank the screen if blank_mode != 0, else unblank.

441 * Implements VESA suspend and powerdown modes on hardware that supports

442 * disabling hsync/vsync:

443 * @blank_mode == 2 means suspend vsync,

444 * @blank_mode == 3 means suspend hsync,

445 * @blank_mode == 4 means powerdown.

446 */

447

448 static int hgafb_blank(int blank_mode, struct fb_info *info)

449 {

450 hga_blank(blank_mode);

451 return 0;

452 }

453

454 /*

455 * Accel functions

456 */

457 static void hgafb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)

458 {

459 u_int rows, y;

460 u8 __iomem *dest;

461

462 y = rect->dy;

463

464 for (rows = rect->height; rows--; y++) {

465 dest = rowaddr(info, y) + (rect->dx >> 3);

466 switch (rect->rop) {

467 case ROP_COPY:

468 memset_io(dest, rect->color, (rect->width >> 3));

469 break;

470 case ROP_XOR:

471 fb_writeb(~(fb_readb(dest)), dest);

472 break;

473 }

474 }

475 }

476

477 static void hgafb_copyarea(struct fb_info *info, const struct fb_copyarea *area)

478 {

479 u_int rows, y1, y2;

480 u8 __iomem *src;

481 u8 __iomem *dest;

482

483 if (area->dy <= area->sy) {

484 y1 = area->sy;

485 y2 = area->dy;

486

487 for (rows = area->height; rows--; ) {

488 src = rowaddr(info, y1) + (area->sx >> 3);

489 dest = rowaddr(info, y2) + (area->dx >> 3);

490 memmove(dest, src, (area->width >> 3));

491 y1++;

492 y2++;

493 }

494 } else {

495 y1 = area->sy + area->height - 1;

496 y2 = area->dy + area->height - 1;

497

498 for (rows = area->height; rows--;) {

499 src = rowaddr(info, y1) + (area->sx >> 3);

500 dest = rowaddr(info, y2) + (area->dx >> 3);

501 memmove(dest, src, (area->width >> 3));

502 y1--;

503 y2--;

504 }

505 }

506 }

507

508 static void hgafb_imageblit(struct fb_info *info, const struct fb_image *image)

509 {

510 u8 __iomem *dest;

511 u8 *cdat = (u8 *) image->data;

512 u_int rows, y = image->dy;

513 u_int x;

514 u8 d;

515

516 for (rows = image->height; rows--; y++) {

517 for (x = 0; x < image->width; x+= 8) {

518 d = *cdat++;

519 dest = rowaddr(info, y) + ((image->dx + x)>> 3);

520 fb_writeb(d, dest);

521 }

522 }

523 }

524

525 static struct fb_ops hgafb_ops = {

526 .owner = THIS_MODULE,

527 .fb_open = hgafb_open,

528 .fb_release = hgafb_release,

529 .fb_setcolreg = hgafb_setcolreg,

530 .fb_pan_display = hgafb_pan_display,

531 .fb_blank = hgafb_blank,

532 .fb_fillrect = hgafb_fillrect,

533 .fb_copyarea = hgafb_copyarea,

534 .fb_imageblit = hgafb_imageblit,

535 };

536

537 /* ------------------------------------------------------------------------- *

538 *

539 * Functions in fb_info

540 *

541 * ------------------------------------------------------------------------- */

542

543 /* ------------------------------------------------------------------------- */

544

545 /*

546 * Initialization

547 */

548

549 static int __devinit hgafb_probe(struct platform_device *pdev)

550 {

551 struct fb_info *info;

552

553 if (! hga_card_detect()) {

554 printk(KERN_INFO "hgafb: HGA card not detected.\n");

555 if (hga_vram)

556 iounmap(hga_vram);

557 return -EINVAL;

558 }

559

560 printk(KERN_INFO "hgafb: %s with %ldK of memory detected.\n",

561 hga_type_name, hga_vram_len/1024);

562

563 info = framebuffer_alloc(0, &pdev->dev);

564 if (!info) {

565 iounmap(hga_vram);

566 return -ENOMEM;

567 }

568

569 hga_fix.smem_start = (unsigned long)hga_vram;

570 hga_fix.smem_len = hga_vram_len;

571

572 info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;

573 info->var = hga_default_var;

574 info->fix = hga_fix;

575 info->monspecs.hfmin = 0;

576 info->monspecs.hfmax = 0;

577 info->monspecs.vfmin = 10000;

578 info->monspecs.vfmax = 10000;

579 info->monspecs.dpms = 0;

580 info->fbops = &hgafb_ops;

581 info->screen_base = hga_vram;

582

583 if (register_framebuffer(info) < 0) {

584 framebuffer_release(info);

585 iounmap(hga_vram);

586 return -EINVAL;

587 }

588

589 printk(KERN_INFO "fb%d: %s frame buffer device\n",

590 info->node, info->fix.id);

591 platform_set_drvdata(pdev, info);

592 return 0;

593 }

594

595 static int __devexit hgafb_remove(struct platform_device *pdev)

596 {

597 struct fb_info *info = platform_get_drvdata(pdev);

598

599 hga_txt_mode();

600 hga_clear_screen();

601

602 if (info) {

603 unregister_framebuffer(info);

604 framebuffer_release(info);

605 }

606

607 iounmap(hga_vram);

608

609 if (release_io_ports)

610 release_region(0x3b0, 12);

611

612 if (release_io_port)

613 release_region(0x3bf, 1);

614

615 return 0;

616 }

617

618 static struct platform_driver hgafb_driver = {

619 .probe = hgafb_probe,

620 .remove = __devexit_p(hgafb_remove),

621 .driver = {

622 .name = "hgafb",

623 },

624 };

625

626 static struct platform_device *hgafb_device;

627

628 static int __init hgafb_init(void)

629 {

630 int ret;

631

632 if (fb_get_options("hgafb", NULL))

633 return -ENODEV;

634

635 ret = platform_driver_register(&hgafb_driver);

636

637 if (!ret) {

638 hgafb_device = platform_device_register_simple("hgafb", 0, NULL, 0);

639

640 if (IS_ERR(hgafb_device)) {

641 platform_driver_unregister(&hgafb_driver);

642 ret = PTR_ERR(hgafb_device);

643 }

644 }

645

646 return ret;

647 }

648

649 static void __exit hgafb_exit(void)

650 {

651 platform_device_unregister(hgafb_device);

652 platform_driver_unregister(&hgafb_driver);

653 }

654

655 /* -------------------------------------------------------------------------

656 *

657 * Modularization

658 *

659 * ------------------------------------------------------------------------- */

660

661 MODULE_AUTHOR("Ferenc Bakonyi (fero@drama.obuda.kando.hu)");

662 MODULE_DESCRIPTION("FBDev driver for Hercules Graphics Adaptor");

663 MODULE_LICENSE("GPL");

664

665 module_param(nologo, bool, 0);

666 MODULE_PARM_DESC(nologo, "Disables startup logo if != 0 (default=0)");

667 module_init(hgafb_init);

668 module_exit(hgafb_exit);