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 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 fb_info) + sizeof(struct iga_par) + sizeof(u32)*16;
 399
 400         info = kzalloc(size, GFP_ATOMIC);
 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 = (struct iga_par *) (info + 1);
 408
 409
 410         if ((addr = pdev->resource[0].start) == 0) {
 411                 printk("igafb_init: no memory start\n");
 412                 kfree(info);
 413                 pci_dev_put(pdev);
 414                 return -ENXIO;
 415         }
 416
 417         if ((info->screen_base = ioremap(addr, 1024*1024*2)) == 0) {
 418                 printk("igafb_init: can't remap %lx[2M]\n", addr);
 419                 kfree(info);
 420                 pci_dev_put(pdev);
 421                 return -ENXIO;
 422         }
 423
 424         par->frame_buffer_phys = addr & PCI_BASE_ADDRESS_MEM_MASK;
 425
 426 #ifdef CONFIG_SPARC
 427         /*
 428          * The following is sparc specific and this is why:
 429          *
 430          * IGS2000 has its I/O memory mapped and we want
 431          * to generate memory cycles on PCI, e.g. do ioremap(),
 432          * then readb/writeb() as in Documentation/IO-mapping.txt.
 433          *
 434          * IGS1682 is more traditional, it responds to PCI I/O
 435          * cycles, so we want to access it with inb()/outb().
 436          *
 437          * On sparc, PCIC converts CPU memory access within
 438          * phys window 0x3000xxxx into PCI I/O cycles. Therefore
 439          * we may use readb/writeb to access them with IGS1682.
 440          *
 441          * We do not take io_base_phys from resource[n].start
 442          * on IGS1682 because that chip is BROKEN. It does not
 443          * have a base register for I/O. We just "know" what its
 444          * I/O addresses are.
 445          */
 446         if (iga2000) {
 447                 igafb_fix.mmio_start = par->frame_buffer_phys | 0x00800000;
 448         } else {
 449                 igafb_fix.mmio_start = 0x30000000;      /* XXX */
 450         }
 451         if ((par->io_base = (int) ioremap(igafb_fix.mmio_start, igafb_fix.smem_len)) == 0) {
 452                 printk("igafb_init: can't remap %lx[4K]\n", igafb_fix.mmio_start);
 453                 iounmap((void *)info->screen_base);
 454                 kfree(info);
 455                 pci_dev_put(pdev);
 456                 return -ENXIO;
 457         }
 458
 459         /*
 460          * Figure mmap addresses from PCI config space.
 461          * We need two regions: for video memory and for I/O ports.
 462          * Later one can add region for video coprocessor registers.
 463          * However, mmap routine loops until size != 0, so we put
 464          * one additional region with size == 0.
 465          */
 466
 467         par->mmap_map = kzalloc(4 * sizeof(*par->mmap_map), GFP_ATOMIC);
 468         if (!par->mmap_map) {
 469                 printk("igafb_init: can't alloc mmap_map\n");
 470                 iounmap((void *)par->io_base);
 471                 iounmap(info->screen_base);
 472                 kfree(info);
 473                 pci_dev_put(pdev);
 474                 return -ENOMEM;
 475         }
 476
 477         /*
 478          * Set default vmode and cmode from PROM properties.
 479          */
 480         {
 481                 struct device_node *dp = pci_device_to_OF_node(pdev);
 482                 int node = dp->node;
 483                 int width = prom_getintdefault(node, "width", 1024);
 484                 int height = prom_getintdefault(node, "height", 768);
 485                 int depth = prom_getintdefault(node, "depth", 8);
 486                 switch (width) {
 487                     case 1024:
 488                         if (height == 768)
 489                             default_var = default_var_1024x768;
 490                         break;
 491                     case 1152:
 492                         if (height == 900)
 493                             default_var = default_var_1152x900;
 494                         break;
 495                     case 1280:
 496                         if (height == 1024)
 497                             default_var = default_var_1280x1024;
 498                         break;
 499                     default:
 500                         break;
 501                 }
 502
 503                 switch (depth) {
 504                     case 8:
 505                         default_var.bits_per_pixel = 8;
 506                         break;
 507                     case 16:
 508                         default_var.bits_per_pixel = 16;
 509                         break;
 510                     case 24:
 511                         default_var.bits_per_pixel = 24;
 512                         break;
 513                     case 32:
 514                         default_var.bits_per_pixel = 32;
 515                         break;
 516                     default:
 517                         break;
 518                 }
 519             }
 520
 521 #endif
 522         igafb_fix.smem_start = (unsigned long) info->screen_base;
 523         igafb_fix.line_length = default_var.xres*(default_var.bits_per_pixel/8);
 524         igafb_fix.visual = default_var.bits_per_pixel <= 8 ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
 525
 526         info->var = default_var;
 527         info->fix = igafb_fix;
 528         info->pseudo_palette = (void *)(par + 1);
 529         info->device = &pdev->dev;
 530
 531         if (!iga_init(info, par)) {
 532                 iounmap((void *)par->io_base);
 533                 iounmap(info->screen_base);
 534                 kfree(par->mmap_map);
 535                 kfree(info);
 536         }
 537
 538 #ifdef CONFIG_SPARC
 539             /*
 540              * Add /dev/fb mmap values.
 541              */
 542
 543             /* First region is for video memory */
 544             par->mmap_map[0].voff = 0x0;
 545             par->mmap_map[0].poff = par->frame_buffer_phys & PAGE_MASK;
 546             par->mmap_map[0].size = info->fix.smem_len & PAGE_MASK;
 547             par->mmap_map[0].prot_mask = SRMMU_CACHE;
 548             par->mmap_map[0].prot_flag = SRMMU_WRITE;
 549
 550             /* Second region is for I/O ports */
 551             par->mmap_map[1].voff = par->frame_buffer_phys & PAGE_MASK;
 552             par->mmap_map[1].poff = info->fix.smem_start & PAGE_MASK;
 553             par->mmap_map[1].size = PAGE_SIZE * 2; /* X wants 2 pages */
 554             par->mmap_map[1].prot_mask = SRMMU_CACHE;
 555             par->mmap_map[1].prot_flag = SRMMU_WRITE;
 556 #endif /* CONFIG_SPARC */
 557
 558         return 0;
 559 }
 560
 561 int __init igafb_setup(char *options)
 562 {
 563     char *this_opt;
 564
 565     if (!options || !*options)
 566         return 0;
 567
 568     while ((this_opt = strsep(&options, ",")) != NULL) {
 569     }
 570     return 0;
 571 }
 572
 573 module_init(igafb_init);
 574 MODULE_LICENSE("GPL");
 575 static struct pci_device_id igafb_pci_tbl[] __devinitdata = {
 576         { PCI_VENDOR_ID_INTERG, PCI_DEVICE_ID_INTERG_1682,
 577           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 578         { }
 579 };
 580
 581 MODULE_DEVICE_TABLE(pci, igafb_pci_tbl);