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,
 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         /* Each page, see which map applies */
 236         for (page = 0; page < size; ) {
 237                 map_size = 0;
 238                 for (i = 0; par->mmap_map[i].size; i++) {
 239                         unsigned long start = par->mmap_map[i].voff;
 240                         unsigned long end = start + par->mmap_map[i].size;
 241                         unsigned long offset = (vma->vm_pgoff << PAGE_SHIFT) + page;
 242
 243                         if (start > offset)
 244                                 continue;
 245                         if (offset >= end)
 246                                 continue;
 247
 248                         map_size = par->mmap_map[i].size - (offset - start);
 249                         map_offset = par->mmap_map[i].poff + (offset - start);
 250                         break;
 251                 }
 252                 if (!map_size) {
 253                         page += PAGE_SIZE;
 254                         continue;
 255                 }
 256                 if (page + map_size > size)
 257                         map_size = size - page;
 258
 259                 pgprot_val(vma->vm_page_prot) &= ~(par->mmap_map[i].prot_mask);
 260                 pgprot_val(vma->vm_page_prot) |= par->mmap_map[i].prot_flag;
 261
 262                 if (remap_pfn_range(vma, vma->vm_start + page,
 263                         map_offset >> PAGE_SHIFT, map_size, vma->vm_page_prot))
 264                         return -EAGAIN;
 265
 266                 page += map_size;
 267         }
 268
 269         if (!map_size)
 270                 return -EINVAL;
 271
 272         vma->vm_flags |= VM_IO;
 273         return 0;
 274 }
 275 #endif /* __sparc__ */
 276
 277 static int igafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 278                            unsigned blue, unsigned transp,
 279                            struct fb_info *info)
 280 {
 281         /*
 282          *  Set a single color register. The values supplied are
 283          *  already rounded down to the hardware's capabilities
 284          *  (according to the entries in the `var' structure). Return
 285          *  != 0 for invalid regno.
 286          */
 287         struct iga_par *par = (struct iga_par *)info->par;
 288
 289         if (regno >= info->cmap.len)
 290                 return 1;
 291
 292         pci_outb(par, regno, DAC_W_INDEX);
 293         pci_outb(par, red,   DAC_DATA);
 294         pci_outb(par, green, DAC_DATA);
 295         pci_outb(par, blue,  DAC_DATA);
 296
 297         if (regno < 16) {
 298                 switch (info->var.bits_per_pixel) {
 299                 case 16:
 300                         ((u16*)(info->pseudo_palette))[regno] =
 301                                 (regno << 10) | (regno << 5) | regno;
 302                         break;
 303                 case 24:
 304                         ((u32*)(info->pseudo_palette))[regno] =
 305                                 (regno << 16) | (regno << 8) | regno;
 306                 break;
 307                 case 32:
 308                         { int i;
 309                         i = (regno << 8) | regno;
 310                         ((u32*)(info->pseudo_palette))[regno] = (i << 16) | i;
 311                         }
 312                         break;
 313                 }
 314         }
 315         return 0;
 316 }
 317
 318 /*
 319  * Framebuffer option structure
 320  */
 321 static struct fb_ops igafb_ops = {
 322         .owner          = THIS_MODULE,
 323         .fb_setcolreg   = igafb_setcolreg,
 324         .fb_fillrect    = cfb_fillrect,
 325         .fb_copyarea    = cfb_copyarea,
 326         .fb_imageblit   = cfb_imageblit,
 327 #ifdef __sparc__
 328         .fb_mmap        = igafb_mmap,
 329 #endif
 330 };
 331
 332 static int __init iga_init(struct fb_info *info, struct iga_par *par)
 333 {
 334         char vramsz = iga_inb(par, IGA_EXT_CNTRL, IGA_IDX_EXT_BUS_CNTL)
 335                                                          & MEM_SIZE_ALIAS;
 336         int video_cmap_len;
 337
 338         switch (vramsz) {
 339         case MEM_SIZE_1M:
 340                 info->fix.smem_len = 0x100000;
 341                 break;
 342         case MEM_SIZE_2M:
 343                 info->fix.smem_len = 0x200000;
 344                 break;
 345         case MEM_SIZE_4M:
 346         case MEM_SIZE_RESERVED:
 347                 info->fix.smem_len = 0x400000;
 348                 break;
 349         }
 350
 351         if (info->var.bits_per_pixel > 8)
 352                 video_cmap_len = 16;
 353         else
 354                 video_cmap_len = 256;
 355
 356         info->fbops = &igafb_ops;
 357         info->flags = FBINFO_DEFAULT;
 358
 359         fb_alloc_cmap(&info->cmap, video_cmap_len, 0);
 360
 361         if (register_framebuffer(info) < 0)
 362                 return 0;
 363
 364         printk("fb%d: %s frame buffer device at 0x%08lx [%dMB VRAM]\n",
 365                info->node, info->fix.id,
 366                par->frame_buffer_phys, info->fix.smem_len >> 20);
 367
 368         iga_blank_border(par);
 369         return 1;
 370 }
 371
 372 int __init igafb_init(void)
 373 {
 374         extern int con_is_present(void);
 375         struct fb_info *info;
 376         struct pci_dev *pdev;
 377         struct iga_par *par;
 378         unsigned long addr;
 379         int size, iga2000 = 0;
 380
 381         if (fb_get_options("igafb", NULL))
 382                 return -ENODEV;
 383
 384         /* Do not attach when we have a serial console. */
 385         if (!con_is_present())
 386                 return -ENXIO;
 387
 388         pdev = pci_find_device(PCI_VENDOR_ID_INTERG,
 389                                PCI_DEVICE_ID_INTERG_1682, 0);
 390         if (pdev == NULL) {
 391                 /*
 392                  * XXX We tried to use cyber2000fb.c for IGS 2000.
 393                  * But it does not initialize the chip in JavaStation-E, alas.
 394                  */
 395                 pdev = pci_find_device(PCI_VENDOR_ID_INTERG, 0x2000, 0);
 396                 if(pdev == NULL) {
 397                         return -ENXIO;
 398                 }
 399                 iga2000 = 1;
 400         }
 401
 402         size = sizeof(struct fb_info) + sizeof(struct iga_par) + sizeof(u32)*16;
 403
 404         info = kmalloc(size, GFP_ATOMIC);
 405         if (!info) {
 406                 printk("igafb_init: can't alloc fb_info\n");
 407                 return -ENOMEM;
 408         }
 409         memset(info, 0, size);
 410
 411         par = (struct iga_par *) (info + 1);
 412
 413
 414         if ((addr = pdev->resource[0].start) == 0) {
 415                 printk("igafb_init: no memory start\n");
 416                 kfree(info);
 417                 return -ENXIO;
 418         }
 419
 420         if ((info->screen_base = ioremap(addr, 1024*1024*2)) == 0) {
 421                 printk("igafb_init: can't remap %lx[2M]\n", addr);
 422                 kfree(info);
 423                 return -ENXIO;
 424         }
 425
 426         par->frame_buffer_phys = addr & PCI_BASE_ADDRESS_MEM_MASK;
 427
 428 #ifdef __sparc__
 429         /*
 430          * The following is sparc specific and this is why:
 431          *
 432          * IGS2000 has its I/O memory mapped and we want
 433          * to generate memory cycles on PCI, e.g. do ioremap(),
 434          * then readb/writeb() as in Documentation/IO-mapping.txt.
 435          *
 436          * IGS1682 is more traditional, it responds to PCI I/O
 437          * cycles, so we want to access it with inb()/outb().
 438          *
 439          * On sparc, PCIC converts CPU memory access within
 440          * phys window 0x3000xxxx into PCI I/O cycles. Therefore
 441          * we may use readb/writeb to access them with IGS1682.
 442          *
 443          * We do not take io_base_phys from resource[n].start
 444          * on IGS1682 because that chip is BROKEN. It does not
 445          * have a base register for I/O. We just "know" what its
 446          * I/O addresses are.
 447          */
 448         if (iga2000) {
 449                 igafb_fix.mmio_start = par->frame_buffer_phys | 0x00800000;
 450         } else {
 451                 igafb_fix.mmio_start = 0x30000000;      /* XXX */
 452         }
 453         if ((par->io_base = (int) ioremap(igafb_fix.mmio_start, igafb_fix.smem_len)) == 0) {
 454                 printk("igafb_init: can't remap %lx[4K]\n", igafb_fix.mmio_start);
 455                 iounmap((void *)info->screen_base);
 456                 kfree(info);
 457                 return -ENXIO;
 458         }
 459
 460         /*
 461          * Figure mmap addresses from PCI config space.
 462          * We need two regions: for video memory and for I/O ports.
 463          * Later one can add region for video coprocessor registers.
 464          * However, mmap routine loops until size != 0, so we put
 465          * one additional region with size == 0.
 466          */
 467
 468         par->mmap_map = kmalloc(4 * sizeof(*par->mmap_map), GFP_ATOMIC);
 469         if (!par->mmap_map) {
 470                 printk("igafb_init: can't alloc mmap_map\n");
 471                 iounmap((void *)par->io_base);
 472                 iounmap(info->screen_base);
 473                 kfree(info);
 474                 return -ENOMEM;
 475         }
 476
 477         memset(par->mmap_map, 0, 4 * sizeof(*par->mmap_map));
 478
 479         /*
 480          * Set default vmode and cmode from PROM properties.
 481          */
 482         {
 483                 struct pcidev_cookie *cookie = pdev->sysdata;
 484                 int node = cookie->prom_node;
 485                 int width = prom_getintdefault(node, "width", 1024);
 486                 int height = prom_getintdefault(node, "height", 768);
 487                 int depth = prom_getintdefault(node, "depth", 8);
 488                 switch (width) {
 489                     case 1024:
 490                         if (height == 768)
 491                             default_var = default_var_1024x768;
 492                         break;
 493                     case 1152:
 494                         if (height == 900)
 495                             default_var = default_var_1152x900;
 496                         break;
 497                     case 1280:
 498                         if (height == 1024)
 499                             default_var = default_var_1280x1024;
 500                         break;
 501                     default:
 502                         break;
 503                 }
 504
 505                 switch (depth) {
 506                     case 8:
 507                         default_var.bits_per_pixel = 8;
 508                         break;
 509                     case 16:
 510                         default_var.bits_per_pixel = 16;
 511                         break;
 512                     case 24:
 513                         default_var.bits_per_pixel = 24;
 514                         break;
 515                     case 32:
 516                         default_var.bits_per_pixel = 32;
 517                         break;
 518                     default:
 519                         break;
 520                 }
 521             }
 522
 523 #endif
 524         igafb_fix.smem_start = (unsigned long) info->screen_base;
 525         igafb_fix.line_length = default_var.xres*(default_var.bits_per_pixel/8);
 526         igafb_fix.visual = default_var.bits_per_pixel <= 8 ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
 527
 528         info->var = default_var;
 529         info->fix = igafb_fix;
 530         info->pseudo_palette = (void *)(par + 1);
 531         info->device = &pdev->dev;
 532
 533         if (!iga_init(info, par)) {
 534                 iounmap((void *)par->io_base);
 535                 iounmap(info->screen_base);
 536                 kfree(par->mmap_map);
 537                 kfree(info);
 538         }
 539
 540 #ifdef __sparc__
 541             /*
 542              * Add /dev/fb mmap values.
 543              */
 544
 545             /* First region is for video memory */
 546             par->mmap_map[0].voff = 0x0;
 547             par->mmap_map[0].poff = par->frame_buffer_phys & PAGE_MASK;
 548             par->mmap_map[0].size = info->fix.smem_len & PAGE_MASK;
 549             par->mmap_map[0].prot_mask = SRMMU_CACHE;
 550             par->mmap_map[0].prot_flag = SRMMU_WRITE;
 551
 552             /* Second region is for I/O ports */
 553             par->mmap_map[1].voff = par->frame_buffer_phys & PAGE_MASK;
 554             par->mmap_map[1].poff = info->fix.smem_start & PAGE_MASK;
 555             par->mmap_map[1].size = PAGE_SIZE * 2; /* X wants 2 pages */
 556             par->mmap_map[1].prot_mask = SRMMU_CACHE;
 557             par->mmap_map[1].prot_flag = SRMMU_WRITE;
 558 #endif /* __sparc__ */
 559
 560         return 0;
 561 }
 562
 563 int __init igafb_setup(char *options)
 564 {
 565     char *this_opt;
 566
 567     if (!options || !*options)
 568         return 0;
 569
 570     while ((this_opt = strsep(&options, ",")) != NULL) {
 571     }
 572     return 0;
 573 }
 574
 575 module_init(igafb_init);
 576 MODULE_LICENSE("GPL");