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   1 /* bw2.c: BWTWO frame buffer driver
   2  *
   3  * Copyright (C) 2003 David S. Miller (davem@redhat.com)
   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/sbus.h>
  23 #include <asm/oplib.h>
  24 #include <asm/fbio.h>
  25
  26 #ifdef CONFIG_SPARC32
  27 #include <asm/sun4paddr.h>
  28 #endif
  29
  30 #include "sbuslib.h"
  31
  32 /*
  33  * Local functions.
  34  */
  35
  36 static int bw2_blank(int, struct fb_info *);
  37
  38 static int bw2_mmap(struct fb_info *, struct vm_area_struct *);
  39 static int bw2_ioctl(struct fb_info *, unsigned int, unsigned long);
  40
  41 /*
  42  *  Frame buffer operations
  43  */
  44
  45 static struct fb_ops bw2_ops = {
  46         .owner                  = THIS_MODULE,
  47         .fb_blank               = bw2_blank,
  48         .fb_fillrect            = cfb_fillrect,
  49         .fb_copyarea            = cfb_copyarea,
  50         .fb_imageblit           = cfb_imageblit,
  51         .fb_mmap                = bw2_mmap,
  52         .fb_ioctl               = bw2_ioctl,
  53 #ifdef CONFIG_COMPAT
  54         .fb_compat_ioctl        = sbusfb_compat_ioctl,
  55 #endif
  56 };
  57
  58 /* OBio addresses for the bwtwo registers */
  59 #define BWTWO_REGISTER_OFFSET 0x400000
  60
  61 struct bt_regs {
  62         volatile u32 addr;
  63         volatile u32 color_map;
  64         volatile u32 control;
  65         volatile u32 cursor;
  66 };
  67
  68 struct bw2_regs {
  69         struct bt_regs  cmap;
  70         volatile u8     control;
  71         volatile u8     status;
  72         volatile u8     cursor_start;
  73         volatile u8     cursor_end;
  74         volatile u8     h_blank_start;
  75         volatile u8     h_blank_end;
  76         volatile u8     h_sync_start;
  77         volatile u8     h_sync_end;
  78         volatile u8     comp_sync_end;
  79         volatile u8     v_blank_start_high;
  80         volatile u8     v_blank_start_low;
  81         volatile u8     v_blank_end;
  82         volatile u8     v_sync_start;
  83         volatile u8     v_sync_end;
  84         volatile u8     xfer_holdoff_start;
  85         volatile u8     xfer_holdoff_end;
  86 };
  87
  88 /* Status Register Constants */
  89 #define BWTWO_SR_RES_MASK       0x70
  90 #define BWTWO_SR_1600_1280      0x50
  91 #define BWTWO_SR_1152_900_76_A  0x40
  92 #define BWTWO_SR_1152_900_76_B  0x60
  93 #define BWTWO_SR_ID_MASK        0x0f
  94 #define BWTWO_SR_ID_MONO        0x02
  95 #define BWTWO_SR_ID_MONO_ECL    0x03
  96 #define BWTWO_SR_ID_MSYNC       0x04
  97 #define BWTWO_SR_ID_NOCONN      0x0a
  98
  99 /* Control Register Constants */
 100 #define BWTWO_CTL_ENABLE_INTS   0x80
 101 #define BWTWO_CTL_ENABLE_VIDEO  0x40
 102 #define BWTWO_CTL_ENABLE_TIMING 0x20
 103 #define BWTWO_CTL_ENABLE_CURCMP 0x10
 104 #define BWTWO_CTL_XTAL_MASK     0x0C
 105 #define BWTWO_CTL_DIVISOR_MASK  0x03
 106
 107 /* Status Register Constants */
 108 #define BWTWO_STAT_PENDING_INT  0x80
 109 #define BWTWO_STAT_MSENSE_MASK  0x70
 110 #define BWTWO_STAT_ID_MASK      0x0f
 111
 112 struct bw2_par {
 113         spinlock_t              lock;
 114         struct bw2_regs         __iomem *regs;
 115
 116         u32                     flags;
 117 #define BW2_FLAG_BLANKED        0x00000001
 118
 119         unsigned long           physbase;
 120         unsigned long           fbsize;
 121
 122         struct sbus_dev         *sdev;
 123 };
 124
 125 /**
 126  *      bw2_blank - Optional function.  Blanks the display.
 127  *      @blank_mode: the blank mode we want.
 128  *      @info: frame buffer structure that represents a single frame buffer
 129  */
 130 static int
 131 bw2_blank(int blank, struct fb_info *info)
 132 {
 133         struct bw2_par *par = (struct bw2_par *) info->par;
 134         struct bw2_regs __iomem *regs = par->regs;
 135         unsigned long flags;
 136         u8 val;
 137
 138         spin_lock_irqsave(&par->lock, flags);
 139
 140         switch (blank) {
 141         case FB_BLANK_UNBLANK: /* Unblanking */
 142                 val = sbus_readb(&regs->control);
 143                 val |= BWTWO_CTL_ENABLE_VIDEO;
 144                 sbus_writeb(val, &regs->control);
 145                 par->flags &= ~BW2_FLAG_BLANKED;
 146                 break;
 147
 148         case FB_BLANK_NORMAL: /* Normal blanking */
 149         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
 150         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 151         case FB_BLANK_POWERDOWN: /* Poweroff */
 152                 val = sbus_readb(&regs->control);
 153                 val &= ~BWTWO_CTL_ENABLE_VIDEO;
 154                 sbus_writeb(val, &regs->control);
 155                 par->flags |= BW2_FLAG_BLANKED;
 156                 break;
 157         }
 158
 159         spin_unlock_irqrestore(&par->lock, flags);
 160
 161         return 0;
 162 }
 163
 164 static struct sbus_mmap_map bw2_mmap_map[] = {
 165         {
 166                 .size = SBUS_MMAP_FBSIZE(1)
 167         },
 168         { .size = 0 }
 169 };
 170
 171 static int bw2_mmap(struct fb_info *info, struct vm_area_struct *vma)
 172 {
 173         struct bw2_par *par = (struct bw2_par *)info->par;
 174
 175         return sbusfb_mmap_helper(bw2_mmap_map,
 176                                   par->physbase, par->fbsize,
 177                                   (par->sdev ?
 178                                    par->sdev->reg_addrs[0].which_io :
 179                                    0),
 180                                   vma);
 181 }
 182
 183 static int bw2_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 184 {
 185         struct bw2_par *par = (struct bw2_par *) info->par;
 186
 187         return sbusfb_ioctl_helper(cmd, arg, info,
 188                                    FBTYPE_SUN2BW, 1, par->fbsize);
 189 }
 190
 191 /*
 192  *  Initialisation
 193  */
 194
 195 static void
 196 bw2_init_fix(struct fb_info *info, int linebytes)
 197 {
 198         strlcpy(info->fix.id, "bwtwo", sizeof(info->fix.id));
 199
 200         info->fix.type = FB_TYPE_PACKED_PIXELS;
 201         info->fix.visual = FB_VISUAL_MONO01;
 202
 203         info->fix.line_length = linebytes;
 204
 205         info->fix.accel = FB_ACCEL_SUN_BWTWO;
 206 }
 207
 208 static u8 bw2regs_1600[] __initdata = {
 209         0x14, 0x8b,     0x15, 0x28,     0x16, 0x03,     0x17, 0x13,
 210         0x18, 0x7b,     0x19, 0x05,     0x1a, 0x34,     0x1b, 0x2e,
 211         0x1c, 0x00,     0x1d, 0x0a,     0x1e, 0xff,     0x1f, 0x01,
 212         0x10, 0x21,     0
 213 };
 214
 215 static u8 bw2regs_ecl[] __initdata = {
 216         0x14, 0x65,     0x15, 0x1e,     0x16, 0x04,     0x17, 0x0c,
 217         0x18, 0x5e,     0x19, 0x03,     0x1a, 0xa7,     0x1b, 0x23,
 218         0x1c, 0x00,     0x1d, 0x08,     0x1e, 0xff,     0x1f, 0x01,
 219         0x10, 0x20,     0
 220 };
 221
 222 static u8 bw2regs_analog[] __initdata = {
 223         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x03,     0x17, 0x13,
 224         0x18, 0xb0,     0x19, 0x03,     0x1a, 0xa6,     0x1b, 0x22,
 225         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
 226         0x10, 0x20,     0
 227 };
 228
 229 static u8 bw2regs_76hz[] __initdata = {
 230         0x14, 0xb7,     0x15, 0x27,     0x16, 0x03,     0x17, 0x0f,
 231         0x18, 0xae,     0x19, 0x03,     0x1a, 0xae,     0x1b, 0x2a,
 232         0x1c, 0x01,     0x1d, 0x09,     0x1e, 0xff,     0x1f, 0x01,
 233         0x10, 0x24,     0
 234 };
 235
 236 static u8 bw2regs_66hz[] __initdata = {
 237         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x04,     0x17, 0x14,
 238         0x18, 0xae,     0x19, 0x03,     0x1a, 0xa8,     0x1b, 0x24,
 239         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
 240         0x10, 0x20,     0
 241 };
 242
 243 static void bw2_do_default_mode(struct bw2_par *par, struct fb_info *info,
 244                                 int *linebytes)
 245 {
 246         u8 status, mon;
 247         u8 *p;
 248
 249         status = sbus_readb(&par->regs->status);
 250         mon = status & BWTWO_SR_RES_MASK;
 251         switch (status & BWTWO_SR_ID_MASK) {
 252         case BWTWO_SR_ID_MONO_ECL:
 253                 if (mon == BWTWO_SR_1600_1280) {
 254                         p = bw2regs_1600;
 255                         info->var.xres = info->var.xres_virtual = 1600;
 256                         info->var.yres = info->var.yres_virtual = 1280;
 257                         *linebytes = 1600 / 8;
 258                 } else
 259                         p = bw2regs_ecl;
 260                 break;
 261
 262         case BWTWO_SR_ID_MONO:
 263                 p = bw2regs_analog;
 264                 break;
 265
 266         case BWTWO_SR_ID_MSYNC:
 267                 if (mon == BWTWO_SR_1152_900_76_A ||
 268                     mon == BWTWO_SR_1152_900_76_B)
 269                         p = bw2regs_76hz;
 270                 else
 271                         p = bw2regs_66hz;
 272                 break;
 273
 274         case BWTWO_SR_ID_NOCONN:
 275                 return;
 276
 277         default:
 278                 prom_printf("bw2: can't handle SR %02x\n",
 279                             status);
 280                 prom_halt();
 281         }
 282         for ( ; *p; p += 2) {
 283                 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
 284                 sbus_writeb(p[1], regp);
 285         }
 286 }
 287
 288 struct all_info {
 289         struct fb_info info;
 290         struct bw2_par par;
 291         struct list_head list;
 292 };
 293 static LIST_HEAD(bw2_list);
 294
 295 static void bw2_init_one(struct sbus_dev *sdev)
 296 {
 297         struct all_info *all;
 298         struct resource *resp;
 299 #ifdef CONFIG_SUN4
 300         struct resource res;
 301 #endif
 302         int linebytes;
 303
 304         all = kmalloc(sizeof(*all), GFP_KERNEL);
 305         if (!all) {
 306                 printk(KERN_ERR "bw2: Cannot allocate memory.\n");
 307                 return;
 308         }
 309         memset(all, 0, sizeof(*all));
 310
 311         INIT_LIST_HEAD(&all->list);
 312
 313         spin_lock_init(&all->par.lock);
 314         all->par.sdev = sdev;
 315
 316 #ifdef CONFIG_SUN4
 317         if (!sdev) {
 318                 all->par.physbase = sun4_bwtwo_physaddr;
 319                 res.start = sun4_bwtwo_physaddr;
 320                 res.end = res.start + BWTWO_REGISTER_OFFSET + sizeof(struct bw2_regs) - 1;
 321                 res.flags = IORESOURCE_IO;
 322                 resp = &res;
 323                 all->info.var.xres = all->info.var.xres_virtual = 1152;
 324                 all->info.var.yres = all->info.var.yres_virtual = 900;
 325                 all->info.var.bits_per_pixel = 1;
 326                 linebytes = 1152 / 8;
 327         } else
 328 #else
 329         {
 330                 if (!sdev)
 331                         BUG();
 332                 all->par.physbase = sdev->reg_addrs[0].phys_addr;
 333                 resp = &sdev->resource[0];
 334                 sbusfb_fill_var(&all->info.var, (sdev ? sdev->prom_node : 0), 1);
 335                 linebytes = prom_getintdefault(sdev->prom_node, "linebytes",
 336                                                all->info.var.xres);
 337         }
 338 #endif
 339         all->info.var.red.length = all->info.var.green.length =
 340                 all->info.var.blue.length = all->info.var.bits_per_pixel;
 341         all->info.var.red.offset = all->info.var.green.offset =
 342                 all->info.var.blue.offset = 0;
 343
 344         all->par.regs = sbus_ioremap(resp, BWTWO_REGISTER_OFFSET,
 345                              sizeof(struct bw2_regs), "bw2 regs");
 346
 347         if (sdev && !prom_getbool(sdev->prom_node, "width"))
 348                 bw2_do_default_mode(&all->par, &all->info, &linebytes);
 349
 350         all->par.fbsize = PAGE_ALIGN(linebytes * all->info.var.yres);
 351
 352         all->info.flags = FBINFO_DEFAULT;
 353         all->info.fbops = &bw2_ops;
 354 #if defined(CONFIG_SPARC32)
 355         if (sdev)
 356                 all->info.screen_base = (char __iomem *)
 357                         prom_getintdefault(sdev->prom_node, "address", 0);
 358 #endif
 359         if (!all->info.screen_base)
 360                 all->info.screen_base =
 361                         sbus_ioremap(resp, 0, all->par.fbsize, "bw2 ram");
 362         all->info.par = &all->par;
 363
 364         bw2_blank(0, &all->info);
 365
 366         bw2_init_fix(&all->info, linebytes);
 367
 368         if (register_framebuffer(&all->info) < 0) {
 369                 printk(KERN_ERR "bw2: Could not register framebuffer.\n");
 370                 kfree(all);
 371                 return;
 372         }
 373
 374         list_add(&all->list, &bw2_list);
 375
 376         printk("bw2: bwtwo at %lx:%lx\n",
 377                (long) (sdev ? sdev->reg_addrs[0].which_io : 0),
 378                (long) all->par.physbase);
 379 }
 380
 381 int __init bw2_init(void)
 382 {
 383         struct sbus_bus *sbus;
 384         struct sbus_dev *sdev;
 385
 386         if (fb_get_options("bw2fb", NULL))
 387                 return -ENODEV;
 388
 389 #ifdef CONFIG_SUN4
 390         bw2_init_one(NULL);
 391 #endif
 392         for_all_sbusdev(sdev, sbus) {
 393                 if (!strcmp(sdev->prom_name, "bwtwo"))
 394                         bw2_init_one(sdev);
 395         }
 396
 397         return 0;
 398 }
 399
 400 void __exit bw2_exit(void)
 401 {
 402         struct list_head *pos, *tmp;
 403
 404         list_for_each_safe(pos, tmp, &bw2_list) {
 405                 struct all_info *all = list_entry(pos, typeof(*all), list);
 406
 407                 unregister_framebuffer(&all->info);
 408                 kfree(all);
 409         }
 410 }
 411
 412 int __init
 413 bw2_setup(char *arg)
 414 {
 415         /* No cmdline options yet... */
 416         return 0;
 417 }
 418
 419 module_init(bw2_init);
 420
 421 #ifdef MODULE
 422 module_exit(bw2_exit);
 423 #endif
 424
 425 MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");
 426 MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
 427 MODULE_LICENSE("GPL");