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   1 /* p9100.c: P9100 frame buffer driver
   2  *
   3  * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
   4  * Copyright 1999 Derrick J Brashear (shadow@dementia.org)
   5  *
   6  * Driver layout based loosely on tgafb.c, see that file for credits.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/errno.h>
  12 #include <linux/string.h>
  13 #include <linux/slab.h>
  14 #include <linux/delay.h>
  15 #include <linux/init.h>
  16 #include <linux/fb.h>
  17 #include <linux/mm.h>
  18 #include <linux/of_device.h>
  19
  20 #include <asm/io.h>
  21 #include <asm/fbio.h>
  22
  23 #include "sbuslib.h"
  24
  25 /*
  26  * Local functions.
  27  */
  28
  29 static int p9100_setcolreg(unsigned, unsigned, unsigned, unsigned,
  30                            unsigned, struct fb_info *);
  31 static int p9100_blank(int, struct fb_info *);
  32
  33 static int p9100_mmap(struct fb_info *, struct vm_area_struct *);
  34 static int p9100_ioctl(struct fb_info *, unsigned int, unsigned long);
  35
  36 /*
  37  *  Frame buffer operations
  38  */
  39
  40 static struct fb_ops p9100_ops = {
  41         .owner                  = THIS_MODULE,
  42         .fb_setcolreg           = p9100_setcolreg,
  43         .fb_blank               = p9100_blank,
  44         .fb_fillrect            = cfb_fillrect,
  45         .fb_copyarea            = cfb_copyarea,
  46         .fb_imageblit           = cfb_imageblit,
  47         .fb_mmap                = p9100_mmap,
  48         .fb_ioctl               = p9100_ioctl,
  49 #ifdef CONFIG_COMPAT
  50         .fb_compat_ioctl        = sbusfb_compat_ioctl,
  51 #endif
  52 };
  53
  54 /* P9100 control registers */
  55 #define P9100_SYSCTL_OFF        0x0UL
  56 #define P9100_VIDEOCTL_OFF      0x100UL
  57 #define P9100_VRAMCTL_OFF       0x180UL
  58 #define P9100_RAMDAC_OFF        0x200UL
  59 #define P9100_VIDEOCOPROC_OFF   0x400UL
  60
  61 /* P9100 command registers */
  62 #define P9100_CMD_OFF 0x0UL
  63
  64 /* P9100 framebuffer memory */
  65 #define P9100_FB_OFF 0x0UL
  66
  67 /* 3 bits: 2=8bpp 3=16bpp 5=32bpp 7=24bpp */
  68 #define SYS_CONFIG_PIXELSIZE_SHIFT 26
  69
  70 #define SCREENPAINT_TIMECTL1_ENABLE_VIDEO 0x20 /* 0 = off, 1 = on */
  71
  72 struct p9100_regs {
  73         /* Registers for the system control */
  74         u32 sys_base;
  75         u32 sys_config;
  76         u32 sys_intr;
  77         u32 sys_int_ena;
  78         u32 sys_alt_rd;
  79         u32 sys_alt_wr;
  80         u32 sys_xxx[58];
  81
  82         /* Registers for the video control */
  83         u32 vid_base;
  84         u32 vid_hcnt;
  85         u32 vid_htotal;
  86         u32 vid_hsync_rise;
  87         u32 vid_hblank_rise;
  88         u32 vid_hblank_fall;
  89         u32 vid_hcnt_preload;
  90         u32 vid_vcnt;
  91         u32 vid_vlen;
  92         u32 vid_vsync_rise;
  93         u32 vid_vblank_rise;
  94         u32 vid_vblank_fall;
  95         u32 vid_vcnt_preload;
  96         u32 vid_screenpaint_addr;
  97         u32 vid_screenpaint_timectl1;
  98         u32 vid_screenpaint_qsfcnt;
  99         u32 vid_screenpaint_timectl2;
 100         u32 vid_xxx[15];
 101
 102         /* Registers for the video control */
 103         u32 vram_base;
 104         u32 vram_memcfg;
 105         u32 vram_refresh_pd;
 106         u32 vram_refresh_cnt;
 107         u32 vram_raslo_max;
 108         u32 vram_raslo_cur;
 109         u32 pwrup_cfg;
 110         u32 vram_xxx[25];
 111
 112         /* Registers for IBM RGB528 Palette */
 113         u32 ramdac_cmap_wridx;
 114         u32 ramdac_palette_data;
 115         u32 ramdac_pixel_mask;
 116         u32 ramdac_palette_rdaddr;
 117         u32 ramdac_idx_lo;
 118         u32 ramdac_idx_hi;
 119         u32 ramdac_idx_data;
 120         u32 ramdac_idx_ctl;
 121         u32 ramdac_xxx[1784];
 122 };
 123
 124 struct p9100_cmd_parameng {
 125         u32 parameng_status;
 126         u32 parameng_bltcmd;
 127         u32 parameng_quadcmd;
 128 };
 129
 130 struct p9100_par {
 131         spinlock_t              lock;
 132         struct p9100_regs       __iomem *regs;
 133
 134         u32                     flags;
 135 #define P9100_FLAG_BLANKED      0x00000001
 136
 137         unsigned long           physbase;
 138         unsigned long           which_io;
 139         unsigned long           fbsize;
 140 };
 141
 142 /**
 143  *      p9100_setcolreg - Optional function. Sets a color register.
 144  *      @regno: boolean, 0 copy local, 1 get_user() function
 145  *      @red: frame buffer colormap structure
 146  *      @green: The green value which can be up to 16 bits wide
 147  *      @blue:  The blue value which can be up to 16 bits wide.
 148  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 149  *      @info: frame buffer info structure
 150  */
 151 static int p9100_setcolreg(unsigned regno,
 152                            unsigned red, unsigned green, unsigned blue,
 153                            unsigned transp, struct fb_info *info)
 154 {
 155         struct p9100_par *par = (struct p9100_par *) info->par;
 156         struct p9100_regs __iomem *regs = par->regs;
 157         unsigned long flags;
 158
 159         if (regno >= 256)
 160                 return 1;
 161
 162         red >>= 8;
 163         green >>= 8;
 164         blue >>= 8;
 165
 166         spin_lock_irqsave(&par->lock, flags);
 167
 168         sbus_writel((regno << 16), &regs->ramdac_cmap_wridx);
 169         sbus_writel((red << 16), &regs->ramdac_palette_data);
 170         sbus_writel((green << 16), &regs->ramdac_palette_data);
 171         sbus_writel((blue << 16), &regs->ramdac_palette_data);
 172
 173         spin_unlock_irqrestore(&par->lock, flags);
 174
 175         return 0;
 176 }
 177
 178 /**
 179  *      p9100_blank - Optional function.  Blanks the display.
 180  *      @blank_mode: the blank mode we want.
 181  *      @info: frame buffer structure that represents a single frame buffer
 182  */
 183 static int
 184 p9100_blank(int blank, struct fb_info *info)
 185 {
 186         struct p9100_par *par = (struct p9100_par *) info->par;
 187         struct p9100_regs __iomem *regs = par->regs;
 188         unsigned long flags;
 189         u32 val;
 190
 191         spin_lock_irqsave(&par->lock, flags);
 192
 193         switch (blank) {
 194         case FB_BLANK_UNBLANK: /* Unblanking */
 195                 val = sbus_readl(&regs->vid_screenpaint_timectl1);
 196                 val |= SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
 197                 sbus_writel(val, &regs->vid_screenpaint_timectl1);
 198                 par->flags &= ~P9100_FLAG_BLANKED;
 199                 break;
 200
 201         case FB_BLANK_NORMAL: /* Normal blanking */
 202         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
 203         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 204         case FB_BLANK_POWERDOWN: /* Poweroff */
 205                 val = sbus_readl(&regs->vid_screenpaint_timectl1);
 206                 val &= ~SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
 207                 sbus_writel(val, &regs->vid_screenpaint_timectl1);
 208                 par->flags |= P9100_FLAG_BLANKED;
 209                 break;
 210         }
 211
 212         spin_unlock_irqrestore(&par->lock, flags);
 213
 214         return 0;
 215 }
 216
 217 static struct sbus_mmap_map p9100_mmap_map[] = {
 218         { CG3_MMAP_OFFSET,      0,              SBUS_MMAP_FBSIZE(1) },
 219         { 0,                    0,              0                   }
 220 };
 221
 222 static int p9100_mmap(struct fb_info *info, struct vm_area_struct *vma)
 223 {
 224         struct p9100_par *par = (struct p9100_par *)info->par;
 225
 226         return sbusfb_mmap_helper(p9100_mmap_map,
 227                                   par->physbase, par->fbsize,
 228                                   par->which_io, vma);
 229 }
 230
 231 static int p9100_ioctl(struct fb_info *info, unsigned int cmd,
 232                        unsigned long arg)
 233 {
 234         struct p9100_par *par = (struct p9100_par *) info->par;
 235
 236         /* Make it look like a cg3. */
 237         return sbusfb_ioctl_helper(cmd, arg, info,
 238                                    FBTYPE_SUN3COLOR, 8, par->fbsize);
 239 }
 240
 241 /*
 242  *  Initialisation
 243  */
 244
 245 static void p9100_init_fix(struct fb_info *info, int linebytes, struct device_node *dp)
 246 {
 247         strlcpy(info->fix.id, dp->name, sizeof(info->fix.id));
 248
 249         info->fix.type = FB_TYPE_PACKED_PIXELS;
 250         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 251
 252         info->fix.line_length = linebytes;
 253
 254         info->fix.accel = FB_ACCEL_SUN_CGTHREE;
 255 }
 256
 257 static int __devinit p9100_probe(struct of_device *op, const struct of_device_id *match)
 258 {
 259         struct device_node *dp = op->node;
 260         struct fb_info *info;
 261         struct p9100_par *par;
 262         int linebytes, err;
 263
 264         info = framebuffer_alloc(sizeof(struct p9100_par), &op->dev);
 265
 266         err = -ENOMEM;
 267         if (!info)
 268                 goto out_err;
 269         par = info->par;
 270
 271         spin_lock_init(&par->lock);
 272
 273         /* This is the framebuffer and the only resource apps can mmap.  */
 274         par->physbase = op->resource[2].start;
 275         par->which_io = op->resource[2].flags & IORESOURCE_BITS;
 276
 277         sbusfb_fill_var(&info->var, dp, 8);
 278         info->var.red.length = 8;
 279         info->var.green.length = 8;
 280         info->var.blue.length = 8;
 281
 282         linebytes = of_getintprop_default(dp, "linebytes", info->var.xres);
 283         par->fbsize = PAGE_ALIGN(linebytes * info->var.yres);
 284
 285         par->regs = of_ioremap(&op->resource[0], 0,
 286                                sizeof(struct p9100_regs), "p9100 regs");
 287         if (!par->regs)
 288                 goto out_release_fb;
 289
 290         info->flags = FBINFO_DEFAULT;
 291         info->fbops = &p9100_ops;
 292         info->screen_base = of_ioremap(&op->resource[2], 0,
 293                                        par->fbsize, "p9100 ram");
 294         if (!info->screen_base)
 295                 goto out_unmap_regs;
 296
 297         p9100_blank(FB_BLANK_UNBLANK, info);
 298
 299         if (fb_alloc_cmap(&info->cmap, 256, 0))
 300                 goto out_unmap_screen;
 301
 302         p9100_init_fix(info, linebytes, dp);
 303
 304         err = register_framebuffer(info);
 305         if (err < 0)
 306                 goto out_dealloc_cmap;
 307
 308         fb_set_cmap(&info->cmap, info);
 309
 310         dev_set_drvdata(&op->dev, info);
 311
 312         printk(KERN_INFO "%s: p9100 at %lx:%lx\n",
 313                dp->full_name,
 314                par->which_io, par->physbase);
 315
 316         return 0;
 317
 318 out_dealloc_cmap:
 319         fb_dealloc_cmap(&info->cmap);
 320
 321 out_unmap_screen:
 322         of_iounmap(&op->resource[2], info->screen_base, par->fbsize);
 323
 324 out_unmap_regs:
 325         of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
 326
 327 out_release_fb:
 328         framebuffer_release(info);
 329
 330 out_err:
 331         return err;
 332 }
 333
 334 static int __devexit p9100_remove(struct of_device *op)
 335 {
 336         struct fb_info *info = dev_get_drvdata(&op->dev);
 337         struct p9100_par *par = info->par;
 338
 339         unregister_framebuffer(info);
 340         fb_dealloc_cmap(&info->cmap);
 341
 342         of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
 343         of_iounmap(&op->resource[2], info->screen_base, par->fbsize);
 344
 345         framebuffer_release(info);
 346
 347         dev_set_drvdata(&op->dev, NULL);
 348
 349         return 0;
 350 }
 351
 352 static const struct of_device_id p9100_match[] = {
 353         {
 354                 .name = "p9100",
 355         },
 356         {},
 357 };
 358 MODULE_DEVICE_TABLE(of, p9100_match);
 359
 360 static struct of_platform_driver p9100_driver = {
 361         .name           = "p9100",
 362         .match_table    = p9100_match,
 363         .probe          = p9100_probe,
 364         .remove         = __devexit_p(p9100_remove),
 365 };
 366
 367 static int __init p9100_init(void)
 368 {
 369         if (fb_get_options("p9100fb", NULL))
 370                 return -ENODEV;
 371
 372         return of_register_driver(&p9100_driver, &of_bus_type);
 373 }
 374
 375 static void __exit p9100_exit(void)
 376 {
 377         of_unregister_driver(&p9100_driver);
 378 }
 379
 380 module_init(p9100_init);
 381 module_exit(p9100_exit);
 382
 383 MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets");
 384 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 385 MODULE_VERSION("2.0");
 386 MODULE_LICENSE("GPL");