drivers/video/fbdev/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         fb_info(info, "%s frame buffer device at 0x%08lx [%dMB VRAM]\n",
 364                 info->fix.id, par->frame_buffer_phys, info->fix.smem_len >> 20);
 365
 366         iga_blank_border(par);
 367         return 1;
 368 }
 369
 370 static int __init igafb_init(void)
 371 {
 372         struct fb_info *info;
 373         struct pci_dev *pdev;
 374         struct iga_par *par;
 375         unsigned long addr;
 376         int size, iga2000 = 0;
 377
 378         if (fb_get_options("igafb", NULL))
 379                 return -ENODEV;
 380
 381         pdev = pci_get_device(PCI_VENDOR_ID_INTERG,
 382                                PCI_DEVICE_ID_INTERG_1682, 0);
 383         if (pdev == NULL) {
 384                 /*
 385                  * XXX We tried to use cyber2000fb.c for IGS 2000.
 386                  * But it does not initialize the chip in JavaStation-E, alas.
 387                  */
 388                 pdev = pci_get_device(PCI_VENDOR_ID_INTERG, 0x2000, 0);
 389                 if(pdev == NULL) {
 390                         return -ENXIO;
 391                 }
 392                 iga2000 = 1;
 393         }
 394         /* We leak a reference here but as it cannot be unloaded this is
 395            fine. If you write unload code remember to free it in unload */
 396
 397         size = sizeof(struct iga_par) + sizeof(u32)*16;
 398
 399         info = framebuffer_alloc(size, &pdev->dev);
 400         if (!info) {
 401                 printk("igafb_init: can't alloc fb_info\n");
 402                  pci_dev_put(pdev);
 403                 return -ENOMEM;
 404         }
 405
 406         par = info->par;
 407
 408         if ((addr = pdev->resource[0].start) == 0) {
 409                 printk("igafb_init: no memory start\n");
 410                 kfree(info);
 411                 pci_dev_put(pdev);
 412                 return -ENXIO;
 413         }
 414
 415         if ((info->screen_base = ioremap(addr, 1024*1024*2)) == 0) {
 416                 printk("igafb_init: can't remap %lx[2M]\n", addr);
 417                 kfree(info);
 418                 pci_dev_put(pdev);
 419                 return -ENXIO;
 420         }
 421
 422         par->frame_buffer_phys = addr & PCI_BASE_ADDRESS_MEM_MASK;
 423
 424 #ifdef CONFIG_SPARC
 425         /*
 426          * The following is sparc specific and this is why:
 427          *
 428          * IGS2000 has its I/O memory mapped and we want
 429          * to generate memory cycles on PCI, e.g. do ioremap(),
 430          * then readb/writeb() as in Documentation/io-mapping.txt.
 431          *
 432          * IGS1682 is more traditional, it responds to PCI I/O
 433          * cycles, so we want to access it with inb()/outb().
 434          *
 435          * On sparc, PCIC converts CPU memory access within
 436          * phys window 0x3000xxxx into PCI I/O cycles. Therefore
 437          * we may use readb/writeb to access them with IGS1682.
 438          *
 439          * We do not take io_base_phys from resource[n].start
 440          * on IGS1682 because that chip is BROKEN. It does not
 441          * have a base register for I/O. We just "know" what its
 442          * I/O addresses are.
 443          */
 444         if (iga2000) {
 445                 igafb_fix.mmio_start = par->frame_buffer_phys | 0x00800000;
 446         } else {
 447                 igafb_fix.mmio_start = 0x30000000;      /* XXX */
 448         }
 449         if ((par->io_base = (int) ioremap(igafb_fix.mmio_start, igafb_fix.smem_len)) == 0) {
 450                 printk("igafb_init: can't remap %lx[4K]\n", igafb_fix.mmio_start);
 451                 iounmap((void *)info->screen_base);
 452                 kfree(info);
 453                 pci_dev_put(pdev);
 454                 return -ENXIO;
 455         }
 456
 457         /*
 458          * Figure mmap addresses from PCI config space.
 459          * We need two regions: for video memory and for I/O ports.
 460          * Later one can add region for video coprocessor registers.
 461          * However, mmap routine loops until size != 0, so we put
 462          * one additional region with size == 0.
 463          */
 464
 465         par->mmap_map = kzalloc(4 * sizeof(*par->mmap_map), GFP_ATOMIC);
 466         if (!par->mmap_map) {
 467                 printk("igafb_init: can't alloc mmap_map\n");
 468                 iounmap((void *)par->io_base);
 469                 iounmap(info->screen_base);
 470                 kfree(info);
 471                 pci_dev_put(pdev);
 472                 return -ENOMEM;
 473         }
 474
 475         /*
 476          * Set default vmode and cmode from PROM properties.
 477          */
 478         {
 479                 struct device_node *dp = pci_device_to_OF_node(pdev);
 480                 int node = dp->node;
 481                 int width = prom_getintdefault(node, "width", 1024);
 482                 int height = prom_getintdefault(node, "height", 768);
 483                 int depth = prom_getintdefault(node, "depth", 8);
 484                 switch (width) {
 485                     case 1024:
 486                         if (height == 768)
 487                             default_var = default_var_1024x768;
 488                         break;
 489                     case 1152:
 490                         if (height == 900)
 491                             default_var = default_var_1152x900;
 492                         break;
 493                     case 1280:
 494                         if (height == 1024)
 495                             default_var = default_var_1280x1024;
 496                         break;
 497                     default:
 498                         break;
 499                 }
 500
 501                 switch (depth) {
 502                     case 8:
 503                         default_var.bits_per_pixel = 8;
 504                         break;
 505                     case 16:
 506                         default_var.bits_per_pixel = 16;
 507                         break;
 508                     case 24:
 509                         default_var.bits_per_pixel = 24;
 510                         break;
 511                     case 32:
 512                         default_var.bits_per_pixel = 32;
 513                         break;
 514                     default:
 515                         break;
 516                 }
 517             }
 518
 519 #endif
 520         igafb_fix.smem_start = (unsigned long) info->screen_base;
 521         igafb_fix.line_length = default_var.xres*(default_var.bits_per_pixel/8);
 522         igafb_fix.visual = default_var.bits_per_pixel <= 8 ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
 523
 524         info->var = default_var;
 525         info->fix = igafb_fix;
 526         info->pseudo_palette = (void *)(par + 1);
 527
 528         if (!iga_init(info, par)) {
 529                 iounmap((void *)par->io_base);
 530                 iounmap(info->screen_base);
 531                 kfree(par->mmap_map);
 532                 kfree(info);
 533                 return -ENODEV;
 534         }
 535
 536 #ifdef CONFIG_SPARC
 537             /*
 538              * Add /dev/fb mmap values.
 539              */
 540
 541             /* First region is for video memory */
 542             par->mmap_map[0].voff = 0x0;
 543             par->mmap_map[0].poff = par->frame_buffer_phys & PAGE_MASK;
 544             par->mmap_map[0].size = info->fix.smem_len & PAGE_MASK;
 545             par->mmap_map[0].prot_mask = SRMMU_CACHE;
 546             par->mmap_map[0].prot_flag = SRMMU_WRITE;
 547
 548             /* Second region is for I/O ports */
 549             par->mmap_map[1].voff = par->frame_buffer_phys & PAGE_MASK;
 550             par->mmap_map[1].poff = info->fix.smem_start & PAGE_MASK;
 551             par->mmap_map[1].size = PAGE_SIZE * 2; /* X wants 2 pages */
 552             par->mmap_map[1].prot_mask = SRMMU_CACHE;
 553             par->mmap_map[1].prot_flag = SRMMU_WRITE;
 554 #endif /* CONFIG_SPARC */
 555
 556         return 0;
 557 }
 558
 559 static int __init igafb_setup(char *options)
 560 {
 561     char *this_opt;
 562
 563     if (!options || !*options)
 564         return 0;
 565
 566     while ((this_opt = strsep(&options, ",")) != NULL) {
 567     }
 568     return 0;
 569 }
 570
 571 module_init(igafb_init);
 572 MODULE_LICENSE("GPL");
 573 static struct pci_device_id igafb_pci_tbl[] = {
 574         { PCI_VENDOR_ID_INTERG, PCI_DEVICE_ID_INTERG_1682,
 575           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 576         { }
 577 };
 578
 579 MODULE_DEVICE_TABLE(pci, igafb_pci_tbl);