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