drivers/video/hpfb.c

   1 /*
   2  *      HP300 Topcat framebuffer support (derived from macfb of all things)
   3  *      Phil Blundell <philb@gnu.org> 1998
   4  *      DIO-II, colour map and Catseye support by
   5  *      Kars de Jong <jongk@linux-m68k.org>, May 2004.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/errno.h>
  11 #include <linux/string.h>
  12 #include <linux/mm.h>
  13 #include <linux/delay.h>
  14 #include <linux/init.h>
  15 #include <linux/fb.h>
  16 #include <linux/dio.h>
  17
  18 #include <asm/io.h>
  19 #include <asm/uaccess.h>
  20
  21 static struct fb_info fb_info = {
  22         .fix = {
  23                 .id             = "HP300 ",
  24                 .type           = FB_TYPE_PACKED_PIXELS,
  25                 .visual         = FB_VISUAL_PSEUDOCOLOR,
  26                 .accel          = FB_ACCEL_NONE,
  27         }
  28 };
  29
  30 static unsigned long fb_regs;
  31 static unsigned char fb_bitmask;
  32
  33 #define TC_NBLANK       0x4080
  34 #define TC_WEN          0x4088
  35 #define TC_REN          0x408c
  36 #define TC_FBEN         0x4090
  37 #define TC_PRR          0x40ea
  38
  39 /* These defines match the X window system */
  40 #define RR_CLEAR        0x0
  41 #define RR_COPY         0x3
  42 #define RR_NOOP         0x5
  43 #define RR_XOR          0x6
  44 #define RR_INVERT       0xa
  45 #define RR_COPYINVERTED 0xc
  46 #define RR_SET          0xf
  47
  48 /* blitter regs */
  49 #define BUSY            0x4044
  50 #define WMRR            0x40ef
  51 #define SOURCE_X        0x40f2
  52 #define SOURCE_Y        0x40f6
  53 #define DEST_X          0x40fa
  54 #define DEST_Y          0x40fe
  55 #define WHEIGHT         0x4106
  56 #define WWIDTH          0x4102
  57 #define WMOVE           0x409c
  58
  59 static struct fb_var_screeninfo hpfb_defined = {
  60         .red            = {
  61                 .length = 8,
  62         },
  63         .green          = {
  64                 .length = 8,
  65         },
  66         .blue           = {
  67                 .length = 8,
  68         },
  69         .activate       = FB_ACTIVATE_NOW,
  70         .height         = -1,
  71         .width          = -1,
  72         .vmode          = FB_VMODE_NONINTERLACED,
  73 };
  74
  75 static int hpfb_setcolreg(unsigned regno, unsigned red, unsigned green,
  76                           unsigned blue, unsigned transp,
  77                           struct fb_info *info)
  78 {
  79         /* use MSBs */
  80         unsigned char _red  =red>>8;
  81         unsigned char _green=green>>8;
  82         unsigned char _blue =blue>>8;
  83         unsigned char _regno=regno;
  84
  85         /*
  86          *  Set a single color register. The values supplied are
  87          *  already rounded down to the hardware's capabilities
  88          *  (according to the entries in the `var' structure). Return
  89          *  != 0 for invalid regno.
  90          */
  91
  92         if (regno >= info->cmap.len)
  93                 return 1;
  94
  95         while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);
  96
  97         out_be16(fb_regs + 0x60ba, 0xff);
  98
  99         out_be16(fb_regs + 0x60b2, _red);
 100         out_be16(fb_regs + 0x60b4, _green);
 101         out_be16(fb_regs + 0x60b6, _blue);
 102         out_be16(fb_regs + 0x60b8, ~_regno);
 103         out_be16(fb_regs + 0x60f0, 0xff);
 104
 105         udelay(100);
 106
 107         while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);
 108         out_be16(fb_regs + 0x60b2, 0);
 109         out_be16(fb_regs + 0x60b4, 0);
 110         out_be16(fb_regs + 0x60b6, 0);
 111         out_be16(fb_regs + 0x60b8, 0);
 112
 113         return 0;
 114 }
 115
 116 /* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
 117
 118 static int hpfb_blank(int blank, struct fb_info *info)
 119 {
 120         out_8(fb_regs + TC_NBLANK, (blank ? 0x00 : fb_bitmask));
 121
 122         return 0;
 123 }
 124
 125 static void topcat_blit(int x0, int y0, int x1, int y1, int w, int h, int rr)
 126 {
 127         if (rr >= 0) {
 128                 while (in_8(fb_regs + BUSY) & fb_bitmask)
 129                         ;
 130         }
 131         out_8(fb_regs + TC_FBEN, fb_bitmask);
 132         if (rr >= 0) {
 133                 out_8(fb_regs + TC_WEN, fb_bitmask);
 134                 out_8(fb_regs + WMRR, rr);
 135         }
 136         out_be16(fb_regs + SOURCE_X, x0);
 137         out_be16(fb_regs + SOURCE_Y, y0);
 138         out_be16(fb_regs + DEST_X, x1);
 139         out_be16(fb_regs + DEST_Y, y1);
 140         out_be16(fb_regs + WWIDTH, w);
 141         out_be16(fb_regs + WHEIGHT, h);
 142         out_8(fb_regs + WMOVE, fb_bitmask);
 143 }
 144
 145 static void hpfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
 146 {
 147         topcat_blit(area->sx, area->sy, area->dx, area->dy, area->width, area->height, RR_COPY);
 148 }
 149
 150 static void hpfb_fillrect(struct fb_info *p, const struct fb_fillrect *region)
 151 {
 152         u8 clr;
 153
 154         clr = region->color & 0xff;
 155
 156         while (in_8(fb_regs + BUSY) & fb_bitmask)
 157                 ;
 158
 159         /* Foreground */
 160         out_8(fb_regs + TC_WEN, fb_bitmask & clr);
 161         out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_SET : RR_INVERT));
 162
 163         /* Background */
 164         out_8(fb_regs + TC_WEN, fb_bitmask & ~clr);
 165         out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_CLEAR : RR_NOOP));
 166
 167         topcat_blit(region->dx, region->dy, region->dx, region->dy, region->width, region->height, -1);
 168 }
 169
 170 static int hpfb_sync(struct fb_info *info)
 171 {
 172         /*
 173          * Since we also access the framebuffer directly, we have to wait
 174          * until the block mover is finished
 175          */
 176         while (in_8(fb_regs + BUSY) & fb_bitmask)
 177                 ;
 178
 179         out_8(fb_regs + TC_WEN, fb_bitmask);
 180         out_8(fb_regs + TC_PRR, RR_COPY);
 181         out_8(fb_regs + TC_FBEN, fb_bitmask);
 182
 183         return 0;
 184 }
 185
 186 static struct fb_ops hpfb_ops = {
 187         .owner          = THIS_MODULE,
 188         .fb_setcolreg   = hpfb_setcolreg,
 189         .fb_blank       = hpfb_blank,
 190         .fb_fillrect    = hpfb_fillrect,
 191         .fb_copyarea    = hpfb_copyarea,
 192         .fb_imageblit   = cfb_imageblit,
 193         .fb_sync        = hpfb_sync,
 194 };
 195
 196 /* Common to all HP framebuffers */
 197 #define HPFB_FBWMSB     0x05    /* Frame buffer width           */
 198 #define HPFB_FBWLSB     0x07
 199 #define HPFB_FBHMSB     0x09    /* Frame buffer height          */
 200 #define HPFB_FBHLSB     0x0b
 201 #define HPFB_DWMSB      0x0d    /* Display width                */
 202 #define HPFB_DWLSB      0x0f
 203 #define HPFB_DHMSB      0x11    /* Display height               */
 204 #define HPFB_DHLSB      0x13
 205 #define HPFB_NUMPLANES  0x5b    /* Number of colour planes      */
 206 #define HPFB_FBOMSB     0x5d    /* Frame buffer offset          */
 207 #define HPFB_FBOLSB     0x5f
 208
 209 static int hpfb_init_one(unsigned long phys_base, unsigned long virt_base)
 210 {
 211         unsigned long fboff, fb_width, fb_height, fb_start;
 212         int ret;
 213
 214         fb_regs = virt_base;
 215         fboff = (in_8(fb_regs + HPFB_FBOMSB) << 8) | in_8(fb_regs + HPFB_FBOLSB);
 216
 217         fb_info.fix.smem_start = (in_8(fb_regs + fboff) << 16);
 218
 219         if (phys_base >= DIOII_BASE) {
 220                 fb_info.fix.smem_start += phys_base;
 221         }
 222
 223         if (DIO_SECID(fb_regs) != DIO_ID2_TOPCAT) {
 224                 /* This is the magic incantation the HP X server uses to make Catseye boards work. */
 225                 while (in_be16(fb_regs+0x4800) & 1)
 226                         ;
 227                 out_be16(fb_regs+0x4800, 0);    /* Catseye status */
 228                 out_be16(fb_regs+0x4510, 0);    /* VB */
 229                 out_be16(fb_regs+0x4512, 0);    /* TCNTRL */
 230                 out_be16(fb_regs+0x4514, 0);    /* ACNTRL */
 231                 out_be16(fb_regs+0x4516, 0);    /* PNCNTRL */
 232                 out_be16(fb_regs+0x4206, 0x90); /* RUG Command/Status */
 233                 out_be16(fb_regs+0x60a2, 0);    /* Overlay Mask */
 234                 out_be16(fb_regs+0x60bc, 0);    /* Ram Select */
 235         }
 236
 237         /*
 238          *      Fill in the available video resolution
 239          */
 240         fb_width = (in_8(fb_regs + HPFB_FBWMSB) << 8) | in_8(fb_regs + HPFB_FBWLSB);
 241         fb_info.fix.line_length = fb_width;
 242         fb_height = (in_8(fb_regs + HPFB_FBHMSB) << 8) | in_8(fb_regs + HPFB_FBHLSB);
 243         fb_info.fix.smem_len = fb_width * fb_height;
 244         fb_start = (unsigned long)ioremap_writethrough(fb_info.fix.smem_start,
 245                                                        fb_info.fix.smem_len);
 246         hpfb_defined.xres = (in_8(fb_regs + HPFB_DWMSB) << 8) | in_8(fb_regs + HPFB_DWLSB);
 247         hpfb_defined.yres = (in_8(fb_regs + HPFB_DHMSB) << 8) | in_8(fb_regs + HPFB_DHLSB);
 248         hpfb_defined.xres_virtual = hpfb_defined.xres;
 249         hpfb_defined.yres_virtual = hpfb_defined.yres;
 250         hpfb_defined.bits_per_pixel = in_8(fb_regs + HPFB_NUMPLANES);
 251
 252         printk(KERN_INFO "hpfb: framebuffer at 0x%lx, mapped to 0x%lx, size %dk\n",
 253                fb_info.fix.smem_start, fb_start, fb_info.fix.smem_len/1024);
 254         printk(KERN_INFO "hpfb: mode is %dx%dx%d, linelength=%d\n",
 255                hpfb_defined.xres, hpfb_defined.yres, hpfb_defined.bits_per_pixel, fb_info.fix.line_length);
 256
 257         /*
 258          *      Give the hardware a bit of a prod and work out how many bits per
 259          *      pixel are supported.
 260          */
 261         out_8(fb_regs + TC_WEN, 0xff);
 262         out_8(fb_regs + TC_PRR, RR_COPY);
 263         out_8(fb_regs + TC_FBEN, 0xff);
 264         out_8(fb_start, 0xff);
 265         fb_bitmask = in_8(fb_start);
 266         out_8(fb_start, 0);
 267
 268         /*
 269          *      Enable reading/writing of all the planes.
 270          */
 271         out_8(fb_regs + TC_WEN, fb_bitmask);
 272         out_8(fb_regs + TC_PRR, RR_COPY);
 273         out_8(fb_regs + TC_REN, fb_bitmask);
 274         out_8(fb_regs + TC_FBEN, fb_bitmask);
 275
 276         /*
 277          *      Clear the screen.
 278          */
 279         topcat_blit(0, 0, 0, 0, fb_width, fb_height, RR_CLEAR);
 280
 281         /*
 282          *      Let there be consoles..
 283          */
 284         if (DIO_SECID(fb_regs) == DIO_ID2_TOPCAT)
 285                 strcat(fb_info.fix.id, "Topcat");
 286         else
 287                 strcat(fb_info.fix.id, "Catseye");
 288         fb_info.fbops = &hpfb_ops;
 289         fb_info.flags = FBINFO_DEFAULT;
 290         fb_info.var   = hpfb_defined;
 291         fb_info.screen_base = (char *)fb_start;
 292
 293         ret = fb_alloc_cmap(&fb_info.cmap, 1 << hpfb_defined.bits_per_pixel, 0);
 294         if (ret < 0)
 295                 goto unmap_screen_base;
 296
 297         ret = register_framebuffer(&fb_info);
 298         if (ret < 0)
 299                 goto dealloc_cmap;
 300
 301         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 302                fb_info.node, fb_info.fix.id);
 303
 304         return 0;
 305
 306 dealloc_cmap:
 307         fb_dealloc_cmap(&fb_info.cmap);
 308
 309 unmap_screen_base:
 310         if (fb_info.screen_base) {
 311                 iounmap(fb_info.screen_base);
 312                 fb_info.screen_base = NULL;
 313         }
 314
 315         return ret;
 316 }
 317
 318 /*
 319  * Check that the secondary ID indicates that we have some hope of working with this
 320  * framebuffer.  The catseye boards are pretty much like topcats and we can muddle through.
 321  */
 322
 323 #define topcat_sid_ok(x)  (((x) == DIO_ID2_LRCATSEYE) || ((x) == DIO_ID2_HRCCATSEYE)    \
 324                            || ((x) == DIO_ID2_HRMCATSEYE) || ((x) == DIO_ID2_TOPCAT))
 325
 326 /*
 327  * Initialise the framebuffer
 328  */
 329 static int hpfb_dio_probe(struct dio_dev *d, const struct dio_device_id *ent)
 330 {
 331         unsigned long paddr, vaddr;
 332
 333         paddr = d->resource.start;
 334         if (!request_mem_region(d->resource.start, resource_size(&d->resource), d->name))
 335                 return -EBUSY;
 336
 337         if (d->scode >= DIOII_SCBASE) {
 338                 vaddr = (unsigned long)ioremap(paddr, resource_size(&d->resource));
 339         } else {
 340                 vaddr = paddr + DIO_VIRADDRBASE;
 341         }
 342         printk(KERN_INFO "Topcat found at DIO select code %d "
 343                "(secondary id %02x)\n", d->scode, (d->id >> 8) & 0xff);
 344         if (hpfb_init_one(paddr, vaddr)) {
 345                 if (d->scode >= DIOII_SCBASE)
 346                         iounmap((void *)vaddr);
 347                 return -ENOMEM;
 348         }
 349         return 0;
 350 }
 351
 352 static void hpfb_remove_one(struct dio_dev *d)
 353 {
 354         unregister_framebuffer(&fb_info);
 355         if (d->scode >= DIOII_SCBASE)
 356                 iounmap((void *)fb_regs);
 357         release_mem_region(d->resource.start, resource_size(&d->resource));
 358         fb_dealloc_cmap(&fb_info.cmap);
 359         if (fb_info.screen_base)
 360                 iounmap(fb_info.screen_base);
 361 }
 362
 363 static struct dio_device_id hpfb_dio_tbl[] = {
 364     { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_LRCATSEYE) },
 365     { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRCCATSEYE) },
 366     { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRMCATSEYE) },
 367     { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_TOPCAT) },
 368     { 0 }
 369 };
 370
 371 static struct dio_driver hpfb_driver = {
 372     .name      = "hpfb",
 373     .id_table  = hpfb_dio_tbl,
 374     .probe     = hpfb_dio_probe,
 375     .remove    = hpfb_remove_one,
 376 };
 377
 378 int __init hpfb_init(void)
 379 {
 380         unsigned int sid;
 381         mm_segment_t fs;
 382         unsigned char i;
 383         int err;
 384
 385         /* Topcats can be on the internal IO bus or real DIO devices.
 386          * The internal variant sits at 0x560000; it has primary
 387          * and secondary ID registers just like the DIO version.
 388          * So we merge the two detection routines.
 389          *
 390          * Perhaps this #define should be in a global header file:
 391          * I believe it's common to all internal fbs, not just topcat.
 392          */
 393 #define INTFBVADDR 0xf0560000
 394 #define INTFBPADDR 0x560000
 395
 396         if (!MACH_IS_HP300)
 397                 return -ENODEV;
 398
 399         if (fb_get_options("hpfb", NULL))
 400                 return -ENODEV;
 401
 402         err = dio_register_driver(&hpfb_driver);
 403         if (err)
 404                 return err;
 405
 406         fs = get_fs();
 407         set_fs(KERNEL_DS);
 408         err = get_user(i, (unsigned char *)INTFBVADDR + DIO_IDOFF);
 409         set_fs(fs);
 410
 411         if (!err && (i == DIO_ID_FBUFFER) && topcat_sid_ok(sid = DIO_SECID(INTFBVADDR))) {
 412                 if (!request_mem_region(INTFBPADDR, DIO_DEVSIZE, "Internal Topcat"))
 413                         return -EBUSY;
 414                 printk(KERN_INFO "Internal Topcat found (secondary id %02x)\n", sid);
 415                 if (hpfb_init_one(INTFBPADDR, INTFBVADDR)) {
 416                         return -ENOMEM;
 417                 }
 418         }
 419         return 0;
 420 }
 421
 422 void __exit hpfb_cleanup_module(void)
 423 {
 424         dio_unregister_driver(&hpfb_driver);
 425 }
 426
 427 module_init(hpfb_init);
 428 module_exit(hpfb_cleanup_module);
 429
 430 MODULE_LICENSE("GPL");