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.h>
  21 #include <linux/platform_device.h>
  22
  23 #include <asm/io.h>
  24 #include <asm/fbio.h>
  25
  26 #include "sbuslib.h"
  27
  28 /*
  29  * Local functions.
  30  */
  31
  32 static int bw2_blank(int, struct fb_info *);
  33
  34 static int bw2_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma);
  35 static int bw2_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg);
  36
  37 /*
  38  *  Frame buffer operations
  39  */
  40
  41 static const struct fb_ops bw2_ops = {
  42         .owner                  = THIS_MODULE,
  43         FB_DEFAULT_SBUS_OPS(bw2),
  44         .fb_blank               = bw2_blank,
  45 };
  46
  47 /* OBio addresses for the bwtwo registers */
  48 #define BWTWO_REGISTER_OFFSET 0x400000
  49
  50 struct bt_regs {
  51         u32 addr;
  52         u32 color_map;
  53         u32 control;
  54         u32 cursor;
  55 };
  56
  57 struct bw2_regs {
  58         struct bt_regs  cmap;
  59         u8      control;
  60         u8      status;
  61         u8      cursor_start;
  62         u8      cursor_end;
  63         u8      h_blank_start;
  64         u8      h_blank_end;
  65         u8      h_sync_start;
  66         u8      h_sync_end;
  67         u8      comp_sync_end;
  68         u8      v_blank_start_high;
  69         u8      v_blank_start_low;
  70         u8      v_blank_end;
  71         u8      v_sync_start;
  72         u8      v_sync_end;
  73         u8      xfer_holdoff_start;
  74         u8      xfer_holdoff_end;
  75 };
  76
  77 /* Status Register Constants */
  78 #define BWTWO_SR_RES_MASK       0x70
  79 #define BWTWO_SR_1600_1280      0x50
  80 #define BWTWO_SR_1152_900_76_A  0x40
  81 #define BWTWO_SR_1152_900_76_B  0x60
  82 #define BWTWO_SR_ID_MASK        0x0f
  83 #define BWTWO_SR_ID_MONO        0x02
  84 #define BWTWO_SR_ID_MONO_ECL    0x03
  85 #define BWTWO_SR_ID_MSYNC       0x04
  86 #define BWTWO_SR_ID_NOCONN      0x0a
  87
  88 /* Control Register Constants */
  89 #define BWTWO_CTL_ENABLE_INTS   0x80
  90 #define BWTWO_CTL_ENABLE_VIDEO  0x40
  91 #define BWTWO_CTL_ENABLE_TIMING 0x20
  92 #define BWTWO_CTL_ENABLE_CURCMP 0x10
  93 #define BWTWO_CTL_XTAL_MASK     0x0C
  94 #define BWTWO_CTL_DIVISOR_MASK  0x03
  95
  96 /* Status Register Constants */
  97 #define BWTWO_STAT_PENDING_INT  0x80
  98 #define BWTWO_STAT_MSENSE_MASK  0x70
  99 #define BWTWO_STAT_ID_MASK      0x0f
 100
 101 struct bw2_par {
 102         spinlock_t              lock;
 103         struct bw2_regs         __iomem *regs;
 104
 105         u32                     flags;
 106 #define BW2_FLAG_BLANKED        0x00000001
 107
 108         unsigned long           which_io;
 109 };
 110
 111 /**
 112  *      bw2_blank - Optional function.  Blanks the display.
 113  *      @blank: the blank mode we want.
 114  *      @info: frame buffer structure that represents a single frame buffer
 115  */
 116 static int
 117 bw2_blank(int blank, struct fb_info *info)
 118 {
 119         struct bw2_par *par = (struct bw2_par *) info->par;
 120         struct bw2_regs __iomem *regs = par->regs;
 121         unsigned long flags;
 122         u8 val;
 123
 124         spin_lock_irqsave(&par->lock, flags);
 125
 126         switch (blank) {
 127         case FB_BLANK_UNBLANK: /* Unblanking */
 128                 val = sbus_readb(&regs->control);
 129                 val |= BWTWO_CTL_ENABLE_VIDEO;
 130                 sbus_writeb(val, &regs->control);
 131                 par->flags &= ~BW2_FLAG_BLANKED;
 132                 break;
 133
 134         case FB_BLANK_NORMAL: /* Normal blanking */
 135         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
 136         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 137         case FB_BLANK_POWERDOWN: /* Poweroff */
 138                 val = sbus_readb(&regs->control);
 139                 val &= ~BWTWO_CTL_ENABLE_VIDEO;
 140                 sbus_writeb(val, &regs->control);
 141                 par->flags |= BW2_FLAG_BLANKED;
 142                 break;
 143         }
 144
 145         spin_unlock_irqrestore(&par->lock, flags);
 146
 147         return 0;
 148 }
 149
 150 static struct sbus_mmap_map bw2_mmap_map[] = {
 151         {
 152                 .size = SBUS_MMAP_FBSIZE(1)
 153         },
 154         { .size = 0 }
 155 };
 156
 157 static int bw2_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 158 {
 159         struct bw2_par *par = (struct bw2_par *)info->par;
 160
 161         return sbusfb_mmap_helper(bw2_mmap_map,
 162                                   info->fix.smem_start, info->fix.smem_len,
 163                                   par->which_io,
 164                                   vma);
 165 }
 166
 167 static int bw2_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 168 {
 169         return sbusfb_ioctl_helper(cmd, arg, info,
 170                                    FBTYPE_SUN2BW, 1, info->fix.smem_len);
 171 }
 172
 173 /*
 174  *  Initialisation
 175  */
 176
 177 static void bw2_init_fix(struct fb_info *info, int linebytes)
 178 {
 179         strscpy(info->fix.id, "bwtwo", sizeof(info->fix.id));
 180
 181         info->fix.type = FB_TYPE_PACKED_PIXELS;
 182         info->fix.visual = FB_VISUAL_MONO01;
 183
 184         info->fix.line_length = linebytes;
 185
 186         info->fix.accel = FB_ACCEL_SUN_BWTWO;
 187 }
 188
 189 static u8 bw2regs_1600[] = {
 190         0x14, 0x8b,     0x15, 0x28,     0x16, 0x03,     0x17, 0x13,
 191         0x18, 0x7b,     0x19, 0x05,     0x1a, 0x34,     0x1b, 0x2e,
 192         0x1c, 0x00,     0x1d, 0x0a,     0x1e, 0xff,     0x1f, 0x01,
 193         0x10, 0x21,     0
 194 };
 195
 196 static u8 bw2regs_ecl[] = {
 197         0x14, 0x65,     0x15, 0x1e,     0x16, 0x04,     0x17, 0x0c,
 198         0x18, 0x5e,     0x19, 0x03,     0x1a, 0xa7,     0x1b, 0x23,
 199         0x1c, 0x00,     0x1d, 0x08,     0x1e, 0xff,     0x1f, 0x01,
 200         0x10, 0x20,     0
 201 };
 202
 203 static u8 bw2regs_analog[] = {
 204         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x03,     0x17, 0x13,
 205         0x18, 0xb0,     0x19, 0x03,     0x1a, 0xa6,     0x1b, 0x22,
 206         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
 207         0x10, 0x20,     0
 208 };
 209
 210 static u8 bw2regs_76hz[] = {
 211         0x14, 0xb7,     0x15, 0x27,     0x16, 0x03,     0x17, 0x0f,
 212         0x18, 0xae,     0x19, 0x03,     0x1a, 0xae,     0x1b, 0x2a,
 213         0x1c, 0x01,     0x1d, 0x09,     0x1e, 0xff,     0x1f, 0x01,
 214         0x10, 0x24,     0
 215 };
 216
 217 static u8 bw2regs_66hz[] = {
 218         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x04,     0x17, 0x14,
 219         0x18, 0xae,     0x19, 0x03,     0x1a, 0xa8,     0x1b, 0x24,
 220         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
 221         0x10, 0x20,     0
 222 };
 223
 224 static int bw2_do_default_mode(struct bw2_par *par, struct fb_info *info,
 225                                int *linebytes)
 226 {
 227         u8 status, mon;
 228         u8 *p;
 229
 230         status = sbus_readb(&par->regs->status);
 231         mon = status & BWTWO_SR_RES_MASK;
 232         switch (status & BWTWO_SR_ID_MASK) {
 233         case BWTWO_SR_ID_MONO_ECL:
 234                 if (mon == BWTWO_SR_1600_1280) {
 235                         p = bw2regs_1600;
 236                         info->var.xres = info->var.xres_virtual = 1600;
 237                         info->var.yres = info->var.yres_virtual = 1280;
 238                         *linebytes = 1600 / 8;
 239                 } else
 240                         p = bw2regs_ecl;
 241                 break;
 242
 243         case BWTWO_SR_ID_MONO:
 244                 p = bw2regs_analog;
 245                 break;
 246
 247         case BWTWO_SR_ID_MSYNC:
 248                 if (mon == BWTWO_SR_1152_900_76_A ||
 249                     mon == BWTWO_SR_1152_900_76_B)
 250                         p = bw2regs_76hz;
 251                 else
 252                         p = bw2regs_66hz;
 253                 break;
 254
 255         case BWTWO_SR_ID_NOCONN:
 256                 return 0;
 257
 258         default:
 259                 printk(KERN_ERR "bw2: can't handle SR %02x\n",
 260                        status);
 261                 return -EINVAL;
 262         }
 263         for ( ; *p; p += 2) {
 264                 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
 265                 sbus_writeb(p[1], regp);
 266         }
 267         return 0;
 268 }
 269
 270 static int bw2_probe(struct platform_device *op)
 271 {
 272         struct device_node *dp = op->dev.of_node;
 273         struct fb_info *info;
 274         struct bw2_par *par;
 275         int linebytes, err;
 276
 277         info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev);
 278
 279         err = -ENOMEM;
 280         if (!info)
 281                 goto out_err;
 282         par = info->par;
 283
 284         spin_lock_init(&par->lock);
 285
 286         info->fix.smem_start = op->resource[0].start;
 287         par->which_io = op->resource[0].flags & IORESOURCE_BITS;
 288
 289         sbusfb_fill_var(&info->var, dp, 1);
 290         linebytes = of_getintprop_default(dp, "linebytes",
 291                                           info->var.xres);
 292
 293         info->var.red.length = info->var.green.length =
 294                 info->var.blue.length = info->var.bits_per_pixel;
 295         info->var.red.offset = info->var.green.offset =
 296                 info->var.blue.offset = 0;
 297
 298         par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,
 299                                sizeof(struct bw2_regs), "bw2 regs");
 300         if (!par->regs)
 301                 goto out_release_fb;
 302
 303         if (!of_property_present(dp, "width")) {
 304                 err = bw2_do_default_mode(par, info, &linebytes);
 305                 if (err)
 306                         goto out_unmap_regs;
 307         }
 308
 309         info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
 310
 311         info->fbops = &bw2_ops;
 312
 313         info->screen_base = of_ioremap(&op->resource[0], 0,
 314                                        info->fix.smem_len, "bw2 ram");
 315         if (!info->screen_base) {
 316                 err = -ENOMEM;
 317                 goto out_unmap_regs;
 318         }
 319
 320         bw2_blank(FB_BLANK_UNBLANK, info);
 321
 322         bw2_init_fix(info, linebytes);
 323
 324         err = register_framebuffer(info);
 325         if (err < 0)
 326                 goto out_unmap_screen;
 327
 328         dev_set_drvdata(&op->dev, info);
 329
 330         printk(KERN_INFO "%pOF: bwtwo at %lx:%lx\n",
 331                dp, par->which_io, info->fix.smem_start);
 332
 333         return 0;
 334
 335 out_unmap_screen:
 336         of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
 337
 338 out_unmap_regs:
 339         of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
 340
 341 out_release_fb:
 342         framebuffer_release(info);
 343
 344 out_err:
 345         return err;
 346 }
 347
 348 static void bw2_remove(struct platform_device *op)
 349 {
 350         struct fb_info *info = dev_get_drvdata(&op->dev);
 351         struct bw2_par *par = info->par;
 352
 353         unregister_framebuffer(info);
 354
 355         of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
 356         of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
 357
 358         framebuffer_release(info);
 359 }
 360
 361 static const struct of_device_id bw2_match[] = {
 362         {
 363                 .name = "bwtwo",
 364         },
 365         {},
 366 };
 367 MODULE_DEVICE_TABLE(of, bw2_match);
 368
 369 static struct platform_driver bw2_driver = {
 370         .driver = {
 371                 .name = "bw2",
 372                 .of_match_table = bw2_match,
 373         },
 374         .probe          = bw2_probe,
 375         .remove_new     = bw2_remove,
 376 };
 377
 378 static int __init bw2_init(void)
 379 {
 380         if (fb_get_options("bw2fb", NULL))
 381                 return -ENODEV;
 382
 383         return platform_driver_register(&bw2_driver);
 384 }
 385
 386 static void __exit bw2_exit(void)
 387 {
 388         platform_driver_unregister(&bw2_driver);
 389 }
 390
 391 module_init(bw2_init);
 392 module_exit(bw2_exit);
 393
 394 MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");
 395 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 396 MODULE_VERSION("2.0");
 397 MODULE_LICENSE("GPL");