drivers/video/igafb.c

   1 /*
   2  *  linux/drivers/video/igafb.c -- Frame buffer device for IGA 1682
   3  *
   4  *      Copyright (C) 1998  Vladimir Roganov and Gleb Raiko
   5  *
   6  *  This driver is partly based on the Frame buffer device for ATI Mach64
   7  *  and partially on VESA-related code.
   8  *
   9  *      Copyright (C) 1997-1998  Geert Uytterhoeven
  10  *      Copyright (C) 1998  Bernd Harries
  11  *      Copyright (C) 1998  Eddie C. Dost  (ecd@skynet.be)
  12  *
  13  *  This file is subject to the terms and conditions of the GNU General Public
  14  *  License. See the file COPYING in the main directory of this archive for
  15  *  more details.
  16  */
  17
  18 /******************************************************************************
  19
  20   TODO:
  21        Despite of IGA Card has advanced graphic acceleration,
  22        initial version is almost dummy and does not support it.
  23        Support for video modes and acceleration must be added
  24        together with accelerated X-Windows driver implementation.
  25
  26        Most important thing at this moment is that we have working
  27        JavaEngine1  console & X  with new console interface.
  28
  29 ******************************************************************************/
  30
  31 #include <linux/module.h>
  32 #include <linux/kernel.h>
  33 #include <linux/errno.h>
  34 #include <linux/string.h>
  35 #include <linux/mm.h>
  36 #include <linux/tty.h>
  37 #include <linux/slab.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/delay.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/fb.h>
  42 #include <linux/init.h>
  43 #include <linux/pci.h>
  44 #include <linux/nvram.h>
  45
  46 #include <asm/io.h>
  47
  48 #ifdef __sparc__
  49 #include <asm/pbm.h>
  50 #include <asm/pcic.h>
  51 #endif
  52
  53 #include <video/iga.h>
  54
  55 struct pci_mmap_map {
  56     unsigned long voff;
  57     unsigned long poff;
  58     unsigned long size;
  59     unsigned long prot_flag;
  60     unsigned long prot_mask;
  61 };
  62
  63 struct iga_par {
  64         struct pci_mmap_map *mmap_map;
  65         unsigned long frame_buffer_phys;
  66         unsigned long io_base;
  67 };
  68
  69 struct fb_info fb_info;
  70
  71 struct fb_fix_screeninfo igafb_fix __initdata = {
  72         .id             = "IGA 1682",
  73         .type           = FB_TYPE_PACKED_PIXELS,
  74         .mmio_len       = 1000
  75 };
  76
  77 struct fb_var_screeninfo default_var = {
  78         /* 640x480, 60 Hz, Non-Interlaced (25.175 MHz dotclock) */
  79         .xres           = 640,
  80         .yres           = 480,
  81         .xres_virtual   = 640,
  82         .yres_virtual   = 480,
  83         .bits_per_pixel = 8,
  84         .red            = {0, 8, 0 },
  85         .green          = {0, 8, 0 },
  86         .blue           = {0, 8, 0 },
  87         .height         = -1,
  88         .width          = -1,
  89         .accel_flags    = FB_ACCEL_NONE,
  90         .pixclock       = 39722,
  91         .left_margin    = 48,
  92         .right_margin   = 16,
  93         .upper_margin   = 33,
  94         .lower_margin   = 10,
  95         .hsync_len      = 96,
  96         .vsync_len      = 2,
  97         .vmode          = FB_VMODE_NONINTERLACED
  98 };
  99
 100 #ifdef __sparc__
 101 struct fb_var_screeninfo default_var_1024x768 __initdata = {
 102         /* 1024x768, 75 Hz, Non-Interlaced (78.75 MHz dotclock) */
 103         .xres           = 1024,
 104         .yres           = 768,
 105         .xres_virtual   = 1024,
 106         .yres_virtual   = 768,
 107         .bits_per_pixel = 8,
 108         .red            = {0, 8, 0 },
 109         .green          = {0, 8, 0 },
 110         .blue           = {0, 8, 0 },
 111         .height         = -1,
 112         .width          = -1,
 113         .accel_flags    = FB_ACCEL_NONE,
 114         .pixclock       = 12699,
 115         .left_margin    = 176,
 116         .right_margin   = 16,
 117         .upper_margin   = 28,
 118         .lower_margin   = 1,
 119         .hsync_len      = 96,
 120         .vsync_len      = 3,
 121         .vmode          = FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
 122 };
 123
 124 struct fb_var_screeninfo default_var_1152x900 __initdata = {
 125         /* 1152x900, 76 Hz, Non-Interlaced (110.0 MHz dotclock) */
 126         .xres           = 1152,
 127         .yres           = 900,
 128         .xres_virtual   = 1152,
 129         .yres_virtual   = 900,
 130         .bits_per_pixel = 8,
 131         .red            = { 0, 8, 0 },
 132         .green          = { 0, 8, 0 },
 133         .blue           = { 0, 8, 0 },
 134         .height         = -1,
 135         .width          = -1,
 136         .accel_flags    = FB_ACCEL_NONE,
 137         .pixclock       = 9091,
 138         .left_margin    = 234,
 139         .right_margin   = 24,
 140         .upper_margin   = 34,
 141         .lower_margin   = 3,
 142         .hsync_len      = 100,
 143         .vsync_len      = 3,
 144         .vmode          = FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
 145 };
 146
 147 struct fb_var_screeninfo default_var_1280x1024 __initdata = {
 148         /* 1280x1024, 75 Hz, Non-Interlaced (135.00 MHz dotclock) */
 149         .xres           = 1280,
 150         .yres           = 1024,
 151         .xres_virtual   = 1280,
 152         .yres_virtual   = 1024,
 153         .bits_per_pixel = 8,
 154         .red            = {0, 8, 0 },
 155         .green          = {0, 8, 0 },
 156         .blue           = {0, 8, 0 },
 157         .height         = -1,
 158         .width          = -1,
 159         .accel_flags    = 0,
 160         .pixclock       = 7408,
 161         .left_margin    = 248,
 162         .right_margin   = 16,
 163         .upper_margin   = 38,
 164         .lower_margin   = 1,
 165         .hsync_len      = 144,
 166         .vsync_len      = 3,
 167         .vmode          = FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
 168 };
 169
 170 /*
 171  *   Memory-mapped I/O functions for Sparc PCI
 172  *
 173  * On sparc we happen to access I/O with memory mapped functions too.
 174  */
 175 #define pci_inb(par, reg)        readb(par->io_base+(reg))
 176 #define pci_outb(par, val, reg)  writeb(val, par->io_base+(reg))
 177
 178 static inline unsigned int iga_inb(struct iga_par *par, unsigned int reg,
 179                                    unsigned int idx)
 180 {
 181         pci_outb(par, idx, reg);
 182         return pci_inb(par, reg + 1);
 183 }
 184
 185 static inline void iga_outb(struct iga_par *par, unsigned char val,
 186                             unsigned int reg, unsigned int idx )
 187 {
 188         pci_outb(par, idx, reg);
 189         pci_outb(par, val, reg+1);
 190 }
 191
 192 #endif /* __sparc__ */
 193
 194 /*
 195  *  Very important functionality for the JavaEngine1 computer:
 196  *  make screen border black (usign special IGA registers)
 197  */
 198 static void iga_blank_border(struct iga_par *par)
 199 {
 200         int i;
 201 #if 0
 202         /*
 203          * PROM does this for us, so keep this code as a reminder
 204          * about required read from 0x3DA and writing of 0x20 in the end.
 205          */
 206         (void) pci_inb(par, 0x3DA);             /* required for every access */
 207         pci_outb(par, IGA_IDX_VGA_OVERSCAN, IGA_ATTR_CTL);
 208         (void) pci_inb(par, IGA_ATTR_CTL+1);
 209         pci_outb(par, 0x38, IGA_ATTR_CTL);
 210         pci_outb(par, 0x20, IGA_ATTR_CTL);      /* re-enable visual */
 211 #endif
 212         /*
 213          * This does not work as it was designed because the overscan
 214          * color is looked up in the palette. Therefore, under X11
 215          * overscan changes color.
 216          */
 217         for (i=0; i < 3; i++)
 218                 iga_outb(par, 0, IGA_EXT_CNTRL, IGA_IDX_OVERSCAN_COLOR + i);
 219 }
 220
 221 #ifdef __sparc__
 222 static int igafb_mmap(struct fb_info *info, struct file *file,
 223                       struct vm_area_struct *vma)
 224 {
 225         struct iga_par *par = (struct iga_par *)info->par;
 226         unsigned int size, page, map_size = 0;
 227         unsigned long map_offset = 0;
 228         int i;
 229
 230         if (!par->mmap_map)
 231                 return -ENXIO;
 232
 233         size = vma->vm_end - vma->vm_start;
 234
 235         /* To stop the swapper from even considering these pages. */
 236         vma->vm_flags |= (VM_SHM | VM_LOCKED);
 237
 238         /* Each page, see which map applies */
 239         for (page = 0; page < size; ) {
 240                 map_size = 0;
 241                 for (i = 0; par->mmap_map[i].size; i++) {
 242                         unsigned long start = par->mmap_map[i].voff;
 243                         unsigned long end = start + par->mmap_map[i].size;
 244                         unsigned long offset = (vma->vm_pgoff << PAGE_SHIFT) + page;
 245
 246                         if (start > offset)
 247                                 continue;
 248                         if (offset >= end)
 249                                 continue;
 250
 251                         map_size = par->mmap_map[i].size - (offset - start);
 252                         map_offset = par->mmap_map[i].poff + (offset - start);
 253                         break;
 254                 }
 255                 if (!map_size) {
 256                         page += PAGE_SIZE;
 257                         continue;
 258                 }
 259                 if (page + map_size > size)
 260                         map_size = size - page;
 261
 262                 pgprot_val(vma->vm_page_prot) &= ~(par->mmap_map[i].prot_mask);
 263                 pgprot_val(vma->vm_page_prot) |= par->mmap_map[i].prot_flag;
 264
 265                 if (remap_pfn_range(vma, vma->vm_start + page,
 266                         map_offset >> PAGE_SHIFT, map_size, vma->vm_page_prot))
 267                         return -EAGAIN;
 268
 269                 page += map_size;
 270         }
 271
 272         if (!map_size)
 273                 return -EINVAL;
 274
 275         vma->vm_flags |= VM_IO;
 276         return 0;
 277 }
 278 #endif /* __sparc__ */
 279
 280 static int igafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 281                            unsigned blue, unsigned transp,
 282                            struct fb_info *info)
 283 {
 284         /*
 285          *  Set a single color register. The values supplied are
 286          *  already rounded down to the hardware's capabilities
 287          *  (according to the entries in the `var' structure). Return
 288          *  != 0 for invalid regno.
 289          */
 290         struct iga_par *par = (struct iga_par *)info->par;
 291
 292         if (regno >= info->cmap.len)
 293                 return 1;
 294
 295         pci_outb(par, regno, DAC_W_INDEX);
 296         pci_outb(par, red,   DAC_DATA);
 297         pci_outb(par, green, DAC_DATA);
 298         pci_outb(par, blue,  DAC_DATA);
 299
 300         if (regno < 16) {
 301                 switch (info->var.bits_per_pixel) {
 302                 case 16:
 303                         ((u16*)(info->pseudo_palette))[regno] =
 304                                 (regno << 10) | (regno << 5) | regno;
 305                         break;
 306                 case 24:
 307                         ((u32*)(info->pseudo_palette))[regno] =
 308                                 (regno << 16) | (regno << 8) | regno;
 309                 break;
 310                 case 32:
 311                         { int i;
 312                         i = (regno << 8) | regno;
 313                         ((u32*)(info->pseudo_palette))[regno] = (i << 16) | i;
 314                         }
 315                         break;
 316                 }
 317         }
 318         return 0;
 319 }
 320
 321 /*
 322  * Framebuffer option structure
 323  */
 324 static struct fb_ops igafb_ops = {
 325         .owner          = THIS_MODULE,
 326         .fb_setcolreg   = igafb_setcolreg,
 327         .fb_fillrect    = cfb_fillrect,
 328         .fb_copyarea    = cfb_copyarea,
 329         .fb_imageblit   = cfb_imageblit,
 330 #ifdef __sparc__
 331         .fb_mmap        = igafb_mmap,
 332 #endif
 333 };
 334
 335 static int __init iga_init(struct fb_info *info, struct iga_par *par)
 336 {
 337         char vramsz = iga_inb(par, IGA_EXT_CNTRL, IGA_IDX_EXT_BUS_CNTL)
 338                                                          & MEM_SIZE_ALIAS;
 339         int video_cmap_len;
 340
 341         switch (vramsz) {
 342         case MEM_SIZE_1M:
 343                 info->fix.smem_len = 0x100000;
 344                 break;
 345         case MEM_SIZE_2M:
 346                 info->fix.smem_len = 0x200000;
 347                 break;
 348         case MEM_SIZE_4M:
 349         case MEM_SIZE_RESERVED:
 350                 info->fix.smem_len = 0x400000;
 351                 break;
 352         }
 353
 354         if (info->var.bits_per_pixel > 8)
 355                 video_cmap_len = 16;
 356         else
 357                 video_cmap_len = 256;
 358
 359         info->fbops = &igafb_ops;
 360         info->flags = FBINFO_DEFAULT;
 361
 362         fb_alloc_cmap(&info->cmap, video_cmap_len, 0);
 363
 364         if (register_framebuffer(info) < 0)
 365                 return 0;
 366
 367         printk("fb%d: %s frame buffer device at 0x%08lx [%dMB VRAM]\n",
 368                info->node, info->fix.id,
 369                par->frame_buffer_phys, info->fix.smem_len >> 20);
 370
 371         iga_blank_border(par);
 372         return 1;
 373 }
 374
 375 int __init igafb_init(void)
 376 {
 377         extern int con_is_present(void);
 378         struct fb_info *info;
 379         struct pci_dev *pdev;
 380         struct iga_par *par;
 381         unsigned long addr;
 382         int size, iga2000 = 0;
 383
 384         if (fb_get_options("igafb", NULL))
 385                 return -ENODEV;
 386
 387         /* Do not attach when we have a serial console. */
 388         if (!con_is_present())
 389                 return -ENXIO;
 390
 391         pdev = pci_find_device(PCI_VENDOR_ID_INTERG,
 392                                PCI_DEVICE_ID_INTERG_1682, 0);
 393         if (pdev == NULL) {
 394                 /*
 395                  * XXX We tried to use cyber2000fb.c for IGS 2000.
 396                  * But it does not initialize the chip in JavaStation-E, alas.
 397                  */
 398                 pdev = pci_find_device(PCI_VENDOR_ID_INTERG, 0x2000, 0);
 399                 if(pdev == NULL) {
 400                         return -ENXIO;
 401                 }
 402                 iga2000 = 1;
 403         }
 404
 405         size = sizeof(struct fb_info) + sizeof(struct iga_par) + sizeof(u32)*16;
 406
 407         info = kmalloc(size, GFP_ATOMIC);
 408         if (!info) {
 409                 printk("igafb_init: can't alloc fb_info\n");
 410                 return -ENOMEM;
 411         }
 412         memset(info, 0, size);
 413
 414         par = (struct iga_par *) (info + 1);
 415
 416
 417         if ((addr = pdev->resource[0].start) == 0) {
 418                 printk("igafb_init: no memory start\n");
 419                 kfree(info);
 420                 return -ENXIO;
 421         }
 422
 423         if ((info->screen_base = ioremap(addr, 1024*1024*2)) == 0) {
 424                 printk("igafb_init: can't remap %lx[2M]\n", addr);
 425                 kfree(info);
 426                 return -ENXIO;
 427         }
 428
 429         par->frame_buffer_phys = addr & PCI_BASE_ADDRESS_MEM_MASK;
 430
 431 #ifdef __sparc__
 432         /*
 433          * The following is sparc specific and this is why:
 434          *
 435          * IGS2000 has its I/O memory mapped and we want
 436          * to generate memory cycles on PCI, e.g. do ioremap(),
 437          * then readb/writeb() as in Documentation/IO-mapping.txt.
 438          *
 439          * IGS1682 is more traditional, it responds to PCI I/O
 440          * cycles, so we want to access it with inb()/outb().
 441          *
 442          * On sparc, PCIC converts CPU memory access within
 443          * phys window 0x3000xxxx into PCI I/O cycles. Therefore
 444          * we may use readb/writeb to access them with IGS1682.
 445          *
 446          * We do not take io_base_phys from resource[n].start
 447          * on IGS1682 because that chip is BROKEN. It does not
 448          * have a base register for I/O. We just "know" what its
 449          * I/O addresses are.
 450          */
 451         if (iga2000) {
 452                 igafb_fix.mmio_start = par->frame_buffer_phys | 0x00800000;
 453         } else {
 454                 igafb_fix.mmio_start = 0x30000000;      /* XXX */
 455         }
 456         if ((par->io_base = (int) ioremap(igafb_fix.mmio_start, igafb_fix.smem_len)) == 0) {
 457                 printk("igafb_init: can't remap %lx[4K]\n", igafb_fix.mmio_start);
 458                 iounmap((void *)info->screen_base);
 459                 kfree(info);
 460                 return -ENXIO;
 461         }
 462
 463         /*
 464          * Figure mmap addresses from PCI config space.
 465          * We need two regions: for video memory and for I/O ports.
 466          * Later one can add region for video coprocessor registers.
 467          * However, mmap routine loops until size != 0, so we put
 468          * one additional region with size == 0.
 469          */
 470
 471         par->mmap_map = kmalloc(4 * sizeof(*par->mmap_map), GFP_ATOMIC);
 472         if (!par->mmap_map) {
 473                 printk("igafb_init: can't alloc mmap_map\n");
 474                 iounmap((void *)par->io_base);
 475                 iounmap(info->screen_base);
 476                 kfree(info);
 477                 return -ENOMEM;
 478         }
 479
 480         memset(par->mmap_map, 0, 4 * sizeof(*par->mmap_map));
 481
 482         /*
 483          * Set default vmode and cmode from PROM properties.
 484          */
 485         {
 486                 struct pcidev_cookie *cookie = pdev->sysdata;
 487                 int node = cookie->prom_node;
 488                 int width = prom_getintdefault(node, "width", 1024);
 489                 int height = prom_getintdefault(node, "height", 768);
 490                 int depth = prom_getintdefault(node, "depth", 8);
 491                 switch (width) {
 492                     case 1024:
 493                         if (height == 768)
 494                             default_var = default_var_1024x768;
 495                         break;
 496                     case 1152:
 497                         if (height == 900)
 498                             default_var = default_var_1152x900;
 499                         break;
 500                     case 1280:
 501                         if (height == 1024)
 502                             default_var = default_var_1280x1024;
 503                         break;
 504                     default:
 505                         break;
 506                 }
 507
 508                 switch (depth) {
 509                     case 8:
 510                         default_var.bits_per_pixel = 8;
 511                         break;
 512                     case 16:
 513                         default_var.bits_per_pixel = 16;
 514                         break;
 515                     case 24:
 516                         default_var.bits_per_pixel = 24;
 517                         break;
 518                     case 32:
 519                         default_var.bits_per_pixel = 32;
 520                         break;
 521                     default:
 522                         break;
 523                 }
 524             }
 525
 526 #endif
 527         igafb_fix.smem_start = (unsigned long) info->screen_base;
 528         igafb_fix.line_length = default_var.xres*(default_var.bits_per_pixel/8);
 529         igafb_fix.visual = default_var.bits_per_pixel <= 8 ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
 530
 531         info->var = default_var;
 532         info->fix = igafb_fix;
 533         info->pseudo_palette = (void *)(par + 1);
 534         info->device = &pdev->dev;
 535
 536         if (!iga_init(info, par)) {
 537                 iounmap((void *)par->io_base);
 538                 iounmap(info->screen_base);
 539                 kfree(par->mmap_map);
 540                 kfree(info);
 541         }
 542
 543 #ifdef __sparc__
 544             /*
 545              * Add /dev/fb mmap values.
 546              */
 547
 548             /* First region is for video memory */
 549             par->mmap_map[0].voff = 0x0;
 550             par->mmap_map[0].poff = par->frame_buffer_phys & PAGE_MASK;
 551             par->mmap_map[0].size = info->fix.smem_len & PAGE_MASK;
 552             par->mmap_map[0].prot_mask = SRMMU_CACHE;
 553             par->mmap_map[0].prot_flag = SRMMU_WRITE;
 554
 555             /* Second region is for I/O ports */
 556             par->mmap_map[1].voff = par->frame_buffer_phys & PAGE_MASK;
 557             par->mmap_map[1].poff = info->fix.smem_start & PAGE_MASK;
 558             par->mmap_map[1].size = PAGE_SIZE * 2; /* X wants 2 pages */
 559             par->mmap_map[1].prot_mask = SRMMU_CACHE;
 560             par->mmap_map[1].prot_flag = SRMMU_WRITE;
 561 #endif /* __sparc__ */
 562
 563         return 0;
 564 }
 565
 566 int __init igafb_setup(char *options)
 567 {
 568     char *this_opt;
 569
 570     if (!options || !*options)
 571         return 0;
 572
 573     while ((this_opt = strsep(&options, ",")) != NULL) {
 574     }
 575     return 0;
 576 }
 577
 578 module_init(igafb_init);
 579 MODULE_LICENSE("GPL");