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