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