drivers/video/bw2.c

   1 /* bw2.c: BWTWO frame buffer driver
   2  *
   3  * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
   5  * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
   6  * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
   7  *
   8  * Driver layout based loosely on tgafb.c, see that file for credits.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/string.h>
  15 #include <linux/slab.h>
  16 #include <linux/delay.h>
  17 #include <linux/init.h>
  18 #include <linux/fb.h>
  19 #include <linux/mm.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/oplib.h>
  23 #include <asm/prom.h>
  24 #include <asm/of_device.h>
  25 #include <asm/fbio.h>
  26
  27 #include "sbuslib.h"
  28
  29 /*
  30  * Local functions.
  31  */
  32
  33 static int bw2_blank(int, struct fb_info *);
  34
  35 static int bw2_mmap(struct fb_info *, struct vm_area_struct *);
  36 static int bw2_ioctl(struct fb_info *, unsigned int, unsigned long);
  37
  38 /*
  39  *  Frame buffer operations
  40  */
  41
  42 static struct fb_ops bw2_ops = {
  43         .owner                  = THIS_MODULE,
  44         .fb_blank               = bw2_blank,
  45         .fb_fillrect            = cfb_fillrect,
  46         .fb_copyarea            = cfb_copyarea,
  47         .fb_imageblit           = cfb_imageblit,
  48         .fb_mmap                = bw2_mmap,
  49         .fb_ioctl               = bw2_ioctl,
  50 #ifdef CONFIG_COMPAT
  51         .fb_compat_ioctl        = sbusfb_compat_ioctl,
  52 #endif
  53 };
  54
  55 /* OBio addresses for the bwtwo registers */
  56 #define BWTWO_REGISTER_OFFSET 0x400000
  57
  58 struct bt_regs {
  59         u32 addr;
  60         u32 color_map;
  61         u32 control;
  62         u32 cursor;
  63 };
  64
  65 struct bw2_regs {
  66         struct bt_regs  cmap;
  67         u8      control;
  68         u8      status;
  69         u8      cursor_start;
  70         u8      cursor_end;
  71         u8      h_blank_start;
  72         u8      h_blank_end;
  73         u8      h_sync_start;
  74         u8      h_sync_end;
  75         u8      comp_sync_end;
  76         u8      v_blank_start_high;
  77         u8      v_blank_start_low;
  78         u8      v_blank_end;
  79         u8      v_sync_start;
  80         u8      v_sync_end;
  81         u8      xfer_holdoff_start;
  82         u8      xfer_holdoff_end;
  83 };
  84
  85 /* Status Register Constants */
  86 #define BWTWO_SR_RES_MASK       0x70
  87 #define BWTWO_SR_1600_1280      0x50
  88 #define BWTWO_SR_1152_900_76_A  0x40
  89 #define BWTWO_SR_1152_900_76_B  0x60
  90 #define BWTWO_SR_ID_MASK        0x0f
  91 #define BWTWO_SR_ID_MONO        0x02
  92 #define BWTWO_SR_ID_MONO_ECL    0x03
  93 #define BWTWO_SR_ID_MSYNC       0x04
  94 #define BWTWO_SR_ID_NOCONN      0x0a
  95
  96 /* Control Register Constants */
  97 #define BWTWO_CTL_ENABLE_INTS   0x80
  98 #define BWTWO_CTL_ENABLE_VIDEO  0x40
  99 #define BWTWO_CTL_ENABLE_TIMING 0x20
 100 #define BWTWO_CTL_ENABLE_CURCMP 0x10
 101 #define BWTWO_CTL_XTAL_MASK     0x0C
 102 #define BWTWO_CTL_DIVISOR_MASK  0x03
 103
 104 /* Status Register Constants */
 105 #define BWTWO_STAT_PENDING_INT  0x80
 106 #define BWTWO_STAT_MSENSE_MASK  0x70
 107 #define BWTWO_STAT_ID_MASK      0x0f
 108
 109 struct bw2_par {
 110         spinlock_t              lock;
 111         struct bw2_regs         __iomem *regs;
 112
 113         u32                     flags;
 114 #define BW2_FLAG_BLANKED        0x00000001
 115
 116         unsigned long           physbase;
 117         unsigned long           which_io;
 118         unsigned long           fbsize;
 119 };
 120
 121 /**
 122  *      bw2_blank - Optional function.  Blanks the display.
 123  *      @blank_mode: the blank mode we want.
 124  *      @info: frame buffer structure that represents a single frame buffer
 125  */
 126 static int
 127 bw2_blank(int blank, struct fb_info *info)
 128 {
 129         struct bw2_par *par = (struct bw2_par *) info->par;
 130         struct bw2_regs __iomem *regs = par->regs;
 131         unsigned long flags;
 132         u8 val;
 133
 134         spin_lock_irqsave(&par->lock, flags);
 135
 136         switch (blank) {
 137         case FB_BLANK_UNBLANK: /* Unblanking */
 138                 val = sbus_readb(&regs->control);
 139                 val |= BWTWO_CTL_ENABLE_VIDEO;
 140                 sbus_writeb(val, &regs->control);
 141                 par->flags &= ~BW2_FLAG_BLANKED;
 142                 break;
 143
 144         case FB_BLANK_NORMAL: /* Normal blanking */
 145         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
 146         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 147         case FB_BLANK_POWERDOWN: /* Poweroff */
 148                 val = sbus_readb(&regs->control);
 149                 val &= ~BWTWO_CTL_ENABLE_VIDEO;
 150                 sbus_writeb(val, &regs->control);
 151                 par->flags |= BW2_FLAG_BLANKED;
 152                 break;
 153         }
 154
 155         spin_unlock_irqrestore(&par->lock, flags);
 156
 157         return 0;
 158 }
 159
 160 static struct sbus_mmap_map bw2_mmap_map[] = {
 161         {
 162                 .size = SBUS_MMAP_FBSIZE(1)
 163         },
 164         { .size = 0 }
 165 };
 166
 167 static int bw2_mmap(struct fb_info *info, struct vm_area_struct *vma)
 168 {
 169         struct bw2_par *par = (struct bw2_par *)info->par;
 170
 171         return sbusfb_mmap_helper(bw2_mmap_map,
 172                                   par->physbase, par->fbsize,
 173                                   par->which_io,
 174                                   vma);
 175 }
 176
 177 static int bw2_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 178 {
 179         struct bw2_par *par = (struct bw2_par *) info->par;
 180
 181         return sbusfb_ioctl_helper(cmd, arg, info,
 182                                    FBTYPE_SUN2BW, 1, par->fbsize);
 183 }
 184
 185 /*
 186  *  Initialisation
 187  */
 188
 189 static void __devinit bw2_init_fix(struct fb_info *info, int linebytes)
 190 {
 191         strlcpy(info->fix.id, "bwtwo", sizeof(info->fix.id));
 192
 193         info->fix.type = FB_TYPE_PACKED_PIXELS;
 194         info->fix.visual = FB_VISUAL_MONO01;
 195
 196         info->fix.line_length = linebytes;
 197
 198         info->fix.accel = FB_ACCEL_SUN_BWTWO;
 199 }
 200
 201 static u8 bw2regs_1600[] __devinitdata = {
 202         0x14, 0x8b,     0x15, 0x28,     0x16, 0x03,     0x17, 0x13,
 203         0x18, 0x7b,     0x19, 0x05,     0x1a, 0x34,     0x1b, 0x2e,
 204         0x1c, 0x00,     0x1d, 0x0a,     0x1e, 0xff,     0x1f, 0x01,
 205         0x10, 0x21,     0
 206 };
 207
 208 static u8 bw2regs_ecl[] __devinitdata = {
 209         0x14, 0x65,     0x15, 0x1e,     0x16, 0x04,     0x17, 0x0c,
 210         0x18, 0x5e,     0x19, 0x03,     0x1a, 0xa7,     0x1b, 0x23,
 211         0x1c, 0x00,     0x1d, 0x08,     0x1e, 0xff,     0x1f, 0x01,
 212         0x10, 0x20,     0
 213 };
 214
 215 static u8 bw2regs_analog[] __devinitdata = {
 216         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x03,     0x17, 0x13,
 217         0x18, 0xb0,     0x19, 0x03,     0x1a, 0xa6,     0x1b, 0x22,
 218         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
 219         0x10, 0x20,     0
 220 };
 221
 222 static u8 bw2regs_76hz[] __devinitdata = {
 223         0x14, 0xb7,     0x15, 0x27,     0x16, 0x03,     0x17, 0x0f,
 224         0x18, 0xae,     0x19, 0x03,     0x1a, 0xae,     0x1b, 0x2a,
 225         0x1c, 0x01,     0x1d, 0x09,     0x1e, 0xff,     0x1f, 0x01,
 226         0x10, 0x24,     0
 227 };
 228
 229 static u8 bw2regs_66hz[] __devinitdata = {
 230         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x04,     0x17, 0x14,
 231         0x18, 0xae,     0x19, 0x03,     0x1a, 0xa8,     0x1b, 0x24,
 232         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
 233         0x10, 0x20,     0
 234 };
 235
 236 static int __devinit bw2_do_default_mode(struct bw2_par *par,
 237                                          struct fb_info *info,
 238                                          int *linebytes)
 239 {
 240         u8 status, mon;
 241         u8 *p;
 242
 243         status = sbus_readb(&par->regs->status);
 244         mon = status & BWTWO_SR_RES_MASK;
 245         switch (status & BWTWO_SR_ID_MASK) {
 246         case BWTWO_SR_ID_MONO_ECL:
 247                 if (mon == BWTWO_SR_1600_1280) {
 248                         p = bw2regs_1600;
 249                         info->var.xres = info->var.xres_virtual = 1600;
 250                         info->var.yres = info->var.yres_virtual = 1280;
 251                         *linebytes = 1600 / 8;
 252                 } else
 253                         p = bw2regs_ecl;
 254                 break;
 255
 256         case BWTWO_SR_ID_MONO:
 257                 p = bw2regs_analog;
 258                 break;
 259
 260         case BWTWO_SR_ID_MSYNC:
 261                 if (mon == BWTWO_SR_1152_900_76_A ||
 262                     mon == BWTWO_SR_1152_900_76_B)
 263                         p = bw2regs_76hz;
 264                 else
 265                         p = bw2regs_66hz;
 266                 break;
 267
 268         case BWTWO_SR_ID_NOCONN:
 269                 return 0;
 270
 271         default:
 272                 printk(KERN_ERR "bw2: can't handle SR %02x\n",
 273                        status);
 274                 return -EINVAL;
 275         }
 276         for ( ; *p; p += 2) {
 277                 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
 278                 sbus_writeb(p[1], regp);
 279         }
 280         return 0;
 281 }
 282
 283 static int __devinit bw2_probe(struct of_device *op, const struct of_device_id *match)
 284 {
 285         struct device_node *dp = op->node;
 286         struct fb_info *info;
 287         struct bw2_par *par;
 288         int linebytes, err;
 289
 290         info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev);
 291
 292         err = -ENOMEM;
 293         if (!info)
 294                 goto out_err;
 295         par = info->par;
 296
 297         spin_lock_init(&par->lock);
 298
 299         par->physbase = op->resource[0].start;
 300         par->which_io = op->resource[0].flags & IORESOURCE_BITS;
 301
 302         sbusfb_fill_var(&info->var, dp->node, 1);
 303         linebytes = of_getintprop_default(dp, "linebytes",
 304                                           info->var.xres);
 305
 306         info->var.red.length = info->var.green.length =
 307                 info->var.blue.length = info->var.bits_per_pixel;
 308         info->var.red.offset = info->var.green.offset =
 309                 info->var.blue.offset = 0;
 310
 311         par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,
 312                                sizeof(struct bw2_regs), "bw2 regs");
 313         if (!par->regs)
 314                 goto out_release_fb;
 315
 316         if (!of_find_property(dp, "width", NULL)) {
 317                 err = bw2_do_default_mode(par, info, &linebytes);
 318                 if (err)
 319                         goto out_unmap_regs;
 320         }
 321
 322         par->fbsize = PAGE_ALIGN(linebytes * info->var.yres);
 323
 324         info->flags = FBINFO_DEFAULT;
 325         info->fbops = &bw2_ops;
 326
 327         info->screen_base = of_ioremap(&op->resource[0], 0,
 328                                        par->fbsize, "bw2 ram");
 329         if (!info->screen_base)
 330                 goto out_unmap_regs;
 331
 332         bw2_blank(FB_BLANK_UNBLANK, info);
 333
 334         bw2_init_fix(info, linebytes);
 335
 336         err = register_framebuffer(info);
 337         if (err < 0)
 338                 goto out_unmap_screen;
 339
 340         dev_set_drvdata(&op->dev, info);
 341
 342         printk(KERN_INFO "%s: bwtwo at %lx:%lx\n",
 343                dp->full_name, par->which_io, par->physbase);
 344
 345         return 0;
 346
 347 out_unmap_screen:
 348         of_iounmap(&op->resource[0], info->screen_base, par->fbsize);
 349
 350 out_unmap_regs:
 351         of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
 352
 353 out_release_fb:
 354         framebuffer_release(info);
 355
 356 out_err:
 357         return err;
 358 }
 359
 360 static int __devexit bw2_remove(struct of_device *op)
 361 {
 362         struct fb_info *info = dev_get_drvdata(&op->dev);
 363         struct bw2_par *par = info->par;
 364
 365         unregister_framebuffer(info);
 366
 367         of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
 368         of_iounmap(&op->resource[0], info->screen_base, par->fbsize);
 369
 370         framebuffer_release(info);
 371
 372         dev_set_drvdata(&op->dev, NULL);
 373
 374         return 0;
 375 }
 376
 377 static struct of_device_id bw2_match[] = {
 378         {
 379                 .name = "bwtwo",
 380         },
 381         {},
 382 };
 383 MODULE_DEVICE_TABLE(of, bw2_match);
 384
 385 static struct of_platform_driver bw2_driver = {
 386         .name           = "bw2",
 387         .match_table    = bw2_match,
 388         .probe          = bw2_probe,
 389         .remove         = __devexit_p(bw2_remove),
 390 };
 391
 392 static int __init bw2_init(void)
 393 {
 394         if (fb_get_options("bw2fb", NULL))
 395                 return -ENODEV;
 396
 397         return of_register_driver(&bw2_driver, &of_bus_type);
 398 }
 399
 400 static void __exit bw2_exit(void)
 401 {
 402         of_unregister_driver(&bw2_driver);
 403 }
 404
 405 module_init(bw2_init);
 406 module_exit(bw2_exit);
 407
 408 MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");
 409 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 410 MODULE_VERSION("2.0");
 411 MODULE_LICENSE("GPL");