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