drivers/video/fbdev/bw2.c

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