linux/drivers/video/bw2.c
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   1/* bw2.c: BWTWO frame buffer driver
   2 *
   3 * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
   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/delay.h>
  16#include <linux/init.h>
  17#include <linux/fb.h>
  18#include <linux/mm.h>
  19#include <linux/of_device.h>
  20
  21#include <asm/io.h>
  22#include <asm/fbio.h>
  23
  24#include "sbuslib.h"
  25
  26/*
  27 * Local functions.
  28 */
  29
  30static int bw2_blank(int, struct fb_info *);
  31
  32static int bw2_mmap(struct fb_info *, struct vm_area_struct *);
  33static int bw2_ioctl(struct fb_info *, unsigned int, unsigned long);
  34
  35/*
  36 *  Frame buffer operations
  37 */
  38
  39static struct fb_ops bw2_ops = {
  40        .owner                  = THIS_MODULE,
  41        .fb_blank               = bw2_blank,
  42        .fb_fillrect            = cfb_fillrect,
  43        .fb_copyarea            = cfb_copyarea,
  44        .fb_imageblit           = cfb_imageblit,
  45        .fb_mmap                = bw2_mmap,
  46        .fb_ioctl               = bw2_ioctl,
  47#ifdef CONFIG_COMPAT
  48        .fb_compat_ioctl        = sbusfb_compat_ioctl,
  49#endif
  50};
  51
  52/* OBio addresses for the bwtwo registers */
  53#define BWTWO_REGISTER_OFFSET 0x400000
  54
  55struct bt_regs {
  56        u32 addr;
  57        u32 color_map;
  58        u32 control;
  59        u32 cursor;
  60};
  61
  62struct bw2_regs {
  63        struct bt_regs  cmap;
  64        u8      control;
  65        u8      status;
  66        u8      cursor_start;
  67        u8      cursor_end;
  68        u8      h_blank_start;
  69        u8      h_blank_end;
  70        u8      h_sync_start;
  71        u8      h_sync_end;
  72        u8      comp_sync_end;
  73        u8      v_blank_start_high;
  74        u8      v_blank_start_low;
  75        u8      v_blank_end;
  76        u8      v_sync_start;
  77        u8      v_sync_end;
  78        u8      xfer_holdoff_start;
  79        u8      xfer_holdoff_end;
  80};
  81
  82/* Status Register Constants */
  83#define BWTWO_SR_RES_MASK       0x70
  84#define BWTWO_SR_1600_1280      0x50
  85#define BWTWO_SR_1152_900_76_A  0x40
  86#define BWTWO_SR_1152_900_76_B  0x60
  87#define BWTWO_SR_ID_MASK        0x0f
  88#define BWTWO_SR_ID_MONO        0x02
  89#define BWTWO_SR_ID_MONO_ECL    0x03
  90#define BWTWO_SR_ID_MSYNC       0x04
  91#define BWTWO_SR_ID_NOCONN      0x0a
  92
  93/* Control Register Constants */
  94#define BWTWO_CTL_ENABLE_INTS   0x80
  95#define BWTWO_CTL_ENABLE_VIDEO  0x40
  96#define BWTWO_CTL_ENABLE_TIMING 0x20
  97#define BWTWO_CTL_ENABLE_CURCMP 0x10
  98#define BWTWO_CTL_XTAL_MASK     0x0C
  99#define BWTWO_CTL_DIVISOR_MASK  0x03
 100
 101/* Status Register Constants */
 102#define BWTWO_STAT_PENDING_INT  0x80
 103#define BWTWO_STAT_MSENSE_MASK  0x70
 104#define BWTWO_STAT_ID_MASK      0x0f
 105
 106struct bw2_par {
 107        spinlock_t              lock;
 108        struct bw2_regs         __iomem *regs;
 109
 110        u32                     flags;
 111#define BW2_FLAG_BLANKED        0x00000001
 112
 113        unsigned long           which_io;
 114};
 115
 116/**
 117 *      bw2_blank - Optional function.  Blanks the display.
 118 *      @blank_mode: the blank mode we want.
 119 *      @info: frame buffer structure that represents a single frame buffer
 120 */
 121static int
 122bw2_blank(int blank, struct fb_info *info)
 123{
 124        struct bw2_par *par = (struct bw2_par *) info->par;
 125        struct bw2_regs __iomem *regs = par->regs;
 126        unsigned long flags;
 127        u8 val;
 128
 129        spin_lock_irqsave(&par->lock, flags);
 130
 131        switch (blank) {
 132        case FB_BLANK_UNBLANK: /* Unblanking */
 133                val = sbus_readb(&regs->control);
 134                val |= BWTWO_CTL_ENABLE_VIDEO;
 135                sbus_writeb(val, &regs->control);
 136                par->flags &= ~BW2_FLAG_BLANKED;
 137                break;
 138
 139        case FB_BLANK_NORMAL: /* Normal blanking */
 140        case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
 141        case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 142        case FB_BLANK_POWERDOWN: /* Poweroff */
 143                val = sbus_readb(&regs->control);
 144                val &= ~BWTWO_CTL_ENABLE_VIDEO;
 145                sbus_writeb(val, &regs->control);
 146                par->flags |= BW2_FLAG_BLANKED;
 147                break;
 148        }
 149
 150        spin_unlock_irqrestore(&par->lock, flags);
 151
 152        return 0;
 153}
 154
 155static struct sbus_mmap_map bw2_mmap_map[] = {
 156        {
 157                .size = SBUS_MMAP_FBSIZE(1)
 158        },
 159        { .size = 0 }
 160};
 161
 162static int bw2_mmap(struct fb_info *info, struct vm_area_struct *vma)
 163{
 164        struct bw2_par *par = (struct bw2_par *)info->par;
 165
 166        return sbusfb_mmap_helper(bw2_mmap_map,
 167                                  info->fix.smem_start, info->fix.smem_len,
 168                                  par->which_io,
 169                                  vma);
 170}
 171
 172static int bw2_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 173{
 174        return sbusfb_ioctl_helper(cmd, arg, info,
 175                                   FBTYPE_SUN2BW, 1, info->fix.smem_len);
 176}
 177
 178/*
 179 *  Initialisation
 180 */
 181
 182static void bw2_init_fix(struct fb_info *info, int linebytes)
 183{
 184        strlcpy(info->fix.id, "bwtwo", sizeof(info->fix.id));
 185
 186        info->fix.type = FB_TYPE_PACKED_PIXELS;
 187        info->fix.visual = FB_VISUAL_MONO01;
 188
 189        info->fix.line_length = linebytes;
 190
 191        info->fix.accel = FB_ACCEL_SUN_BWTWO;
 192}
 193
 194static u8 bw2regs_1600[] = {
 195        0x14, 0x8b,     0x15, 0x28,     0x16, 0x03,     0x17, 0x13,
 196        0x18, 0x7b,     0x19, 0x05,     0x1a, 0x34,     0x1b, 0x2e,
 197        0x1c, 0x00,     0x1d, 0x0a,     0x1e, 0xff,     0x1f, 0x01,
 198        0x10, 0x21,     0
 199};
 200
 201static u8 bw2regs_ecl[] = {
 202        0x14, 0x65,     0x15, 0x1e,     0x16, 0x04,     0x17, 0x0c,
 203        0x18, 0x5e,     0x19, 0x03,     0x1a, 0xa7,     0x1b, 0x23,
 204        0x1c, 0x00,     0x1d, 0x08,     0x1e, 0xff,     0x1f, 0x01,
 205        0x10, 0x20,     0
 206};
 207
 208static u8 bw2regs_analog[] = {
 209        0x14, 0xbb,     0x15, 0x2b,     0x16, 0x03,     0x17, 0x13,
 210        0x18, 0xb0,     0x19, 0x03,     0x1a, 0xa6,     0x1b, 0x22,
 211        0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
 212        0x10, 0x20,     0
 213};
 214
 215static u8 bw2regs_76hz[] = {
 216        0x14, 0xb7,     0x15, 0x27,     0x16, 0x03,     0x17, 0x0f,
 217        0x18, 0xae,     0x19, 0x03,     0x1a, 0xae,     0x1b, 0x2a,
 218        0x1c, 0x01,     0x1d, 0x09,     0x1e, 0xff,     0x1f, 0x01,
 219        0x10, 0x24,     0
 220};
 221
 222static u8 bw2regs_66hz[] = {
 223        0x14, 0xbb,     0x15, 0x2b,     0x16, 0x04,     0x17, 0x14,
 224        0x18, 0xae,     0x19, 0x03,     0x1a, 0xa8,     0x1b, 0x24,
 225        0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
 226        0x10, 0x20,     0
 227};
 228
 229static int bw2_do_default_mode(struct bw2_par *par, struct fb_info *info,
 230                               int *linebytes)
 231{
 232        u8 status, mon;
 233        u8 *p;
 234
 235        status = sbus_readb(&par->regs->status);
 236        mon = status & BWTWO_SR_RES_MASK;
 237        switch (status & BWTWO_SR_ID_MASK) {
 238        case BWTWO_SR_ID_MONO_ECL:
 239                if (mon == BWTWO_SR_1600_1280) {
 240                        p = bw2regs_1600;
 241                        info->var.xres = info->var.xres_virtual = 1600;
 242                        info->var.yres = info->var.yres_virtual = 1280;
 243                        *linebytes = 1600 / 8;
 244                } else
 245                        p = bw2regs_ecl;
 246                break;
 247
 248        case BWTWO_SR_ID_MONO:
 249                p = bw2regs_analog;
 250                break;
 251
 252        case BWTWO_SR_ID_MSYNC:
 253                if (mon == BWTWO_SR_1152_900_76_A ||
 254                    mon == BWTWO_SR_1152_900_76_B)
 255                        p = bw2regs_76hz;
 256                else
 257                        p = bw2regs_66hz;
 258                break;
 259
 260        case BWTWO_SR_ID_NOCONN:
 261                return 0;
 262
 263        default:
 264                printk(KERN_ERR "bw2: can't handle SR %02x\n",
 265                       status);
 266                return -EINVAL;
 267        }
 268        for ( ; *p; p += 2) {
 269                u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
 270                sbus_writeb(p[1], regp);
 271        }
 272        return 0;
 273}
 274
 275static int bw2_probe(struct platform_device *op)
 276{
 277        struct device_node *dp = op->dev.of_node;
 278        struct fb_info *info;
 279        struct bw2_par *par;
 280        int linebytes, err;
 281
 282        info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev);
 283
 284        err = -ENOMEM;
 285        if (!info)
 286                goto out_err;
 287        par = info->par;
 288
 289        spin_lock_init(&par->lock);
 290
 291        info->fix.smem_start = op->resource[0].start;
 292        par->which_io = op->resource[0].flags & IORESOURCE_BITS;
 293
 294        sbusfb_fill_var(&info->var, dp, 1);
 295        linebytes = of_getintprop_default(dp, "linebytes",
 296                                          info->var.xres);
 297
 298        info->var.red.length = info->var.green.length =
 299                info->var.blue.length = info->var.bits_per_pixel;
 300        info->var.red.offset = info->var.green.offset =
 301                info->var.blue.offset = 0;
 302
 303        par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,
 304                               sizeof(struct bw2_regs), "bw2 regs");
 305        if (!par->regs)
 306                goto out_release_fb;
 307
 308        if (!of_find_property(dp, "width", NULL)) {
 309                err = bw2_do_default_mode(par, info, &linebytes);
 310                if (err)
 311                        goto out_unmap_regs;
 312        }
 313
 314        info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
 315
 316        info->flags = FBINFO_DEFAULT;
 317        info->fbops = &bw2_ops;
 318
 319        info->screen_base = of_ioremap(&op->resource[0], 0,
 320                                       info->fix.smem_len, "bw2 ram");
 321        if (!info->screen_base) {
 322                err = -ENOMEM;
 323                goto out_unmap_regs;
 324        }
 325
 326        bw2_blank(FB_BLANK_UNBLANK, info);
 327
 328        bw2_init_fix(info, linebytes);
 329
 330        err = register_framebuffer(info);
 331        if (err < 0)
 332                goto out_unmap_screen;
 333
 334        dev_set_drvdata(&op->dev, info);
 335
 336        printk(KERN_INFO "%s: bwtwo at %lx:%lx\n",
 337               dp->full_name, par->which_io, info->fix.smem_start);
 338
 339        return 0;
 340
 341out_unmap_screen:
 342        of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
 343
 344out_unmap_regs:
 345        of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
 346
 347out_release_fb:
 348        framebuffer_release(info);
 349
 350out_err:
 351        return err;
 352}
 353
 354static int bw2_remove(struct platform_device *op)
 355{
 356        struct fb_info *info = dev_get_drvdata(&op->dev);
 357        struct bw2_par *par = info->par;
 358
 359        unregister_framebuffer(info);
 360
 361        of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
 362        of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
 363
 364        framebuffer_release(info);
 365
 366        dev_set_drvdata(&op->dev, NULL);
 367
 368        return 0;
 369}
 370
 371static const struct of_device_id bw2_match[] = {
 372        {
 373                .name = "bwtwo",
 374        },
 375        {},
 376};
 377MODULE_DEVICE_TABLE(of, bw2_match);
 378
 379static struct platform_driver bw2_driver = {
 380        .driver = {
 381                .name = "bw2",
 382                .owner = THIS_MODULE,
 383                .of_match_table = bw2_match,
 384        },
 385        .probe          = bw2_probe,
 386        .remove         = bw2_remove,
 387};
 388
 389static int __init bw2_init(void)
 390{
 391        if (fb_get_options("bw2fb", NULL))
 392                return -ENODEV;
 393
 394        return platform_driver_register(&bw2_driver);
 395}
 396
 397static void __exit bw2_exit(void)
 398{
 399        platform_driver_unregister(&bw2_driver);
 400}
 401
 402module_init(bw2_init);
 403module_exit(bw2_exit);
 404
 405MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");
 406MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 407MODULE_VERSION("2.0");
 408MODULE_LICENSE("GPL");
 409
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