drivers/video/fbdev/p9100.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* p9100.c: P9100 frame buffer driver
   3  *
   4  * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
   5  * Copyright 1999 Derrick J Brashear (shadow@dementia.org)
   6  *
   7  * Driver layout based loosely on tgafb.c, see that file for credits.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/errno.h>
  13 #include <linux/string.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.h>
  19 #include <linux/platform_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
  30 static int p9100_setcolreg(unsigned, unsigned, unsigned, unsigned,
  31                            unsigned, struct fb_info *);
  32 static int p9100_blank(int, struct fb_info *);
  33
  34 static int p9100_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma);
  35 static int p9100_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 p9100_ops = {
  42         .owner                  = THIS_MODULE,
  43         FB_DEFAULT_SBUS_OPS(p9100),
  44         .fb_setcolreg           = p9100_setcolreg,
  45         .fb_blank               = p9100_blank,
  46 };
  47
  48 /* P9100 control registers */
  49 #define P9100_SYSCTL_OFF        0x0UL
  50 #define P9100_VIDEOCTL_OFF      0x100UL
  51 #define P9100_VRAMCTL_OFF       0x180UL
  52 #define P9100_RAMDAC_OFF        0x200UL
  53 #define P9100_VIDEOCOPROC_OFF   0x400UL
  54
  55 /* P9100 command registers */
  56 #define P9100_CMD_OFF 0x0UL
  57
  58 /* P9100 framebuffer memory */
  59 #define P9100_FB_OFF 0x0UL
  60
  61 /* 3 bits: 2=8bpp 3=16bpp 5=32bpp 7=24bpp */
  62 #define SYS_CONFIG_PIXELSIZE_SHIFT 26
  63
  64 #define SCREENPAINT_TIMECTL1_ENABLE_VIDEO 0x20 /* 0 = off, 1 = on */
  65
  66 struct p9100_regs {
  67         /* Registers for the system control */
  68         u32 sys_base;
  69         u32 sys_config;
  70         u32 sys_intr;
  71         u32 sys_int_ena;
  72         u32 sys_alt_rd;
  73         u32 sys_alt_wr;
  74         u32 sys_xxx[58];
  75
  76         /* Registers for the video control */
  77         u32 vid_base;
  78         u32 vid_hcnt;
  79         u32 vid_htotal;
  80         u32 vid_hsync_rise;
  81         u32 vid_hblank_rise;
  82         u32 vid_hblank_fall;
  83         u32 vid_hcnt_preload;
  84         u32 vid_vcnt;
  85         u32 vid_vlen;
  86         u32 vid_vsync_rise;
  87         u32 vid_vblank_rise;
  88         u32 vid_vblank_fall;
  89         u32 vid_vcnt_preload;
  90         u32 vid_screenpaint_addr;
  91         u32 vid_screenpaint_timectl1;
  92         u32 vid_screenpaint_qsfcnt;
  93         u32 vid_screenpaint_timectl2;
  94         u32 vid_xxx[15];
  95
  96         /* Registers for the video control */
  97         u32 vram_base;
  98         u32 vram_memcfg;
  99         u32 vram_refresh_pd;
 100         u32 vram_refresh_cnt;
 101         u32 vram_raslo_max;
 102         u32 vram_raslo_cur;
 103         u32 pwrup_cfg;
 104         u32 vram_xxx[25];
 105
 106         /* Registers for IBM RGB528 Palette */
 107         u32 ramdac_cmap_wridx;
 108         u32 ramdac_palette_data;
 109         u32 ramdac_pixel_mask;
 110         u32 ramdac_palette_rdaddr;
 111         u32 ramdac_idx_lo;
 112         u32 ramdac_idx_hi;
 113         u32 ramdac_idx_data;
 114         u32 ramdac_idx_ctl;
 115         u32 ramdac_xxx[1784];
 116 };
 117
 118 struct p9100_cmd_parameng {
 119         u32 parameng_status;
 120         u32 parameng_bltcmd;
 121         u32 parameng_quadcmd;
 122 };
 123
 124 struct p9100_par {
 125         spinlock_t              lock;
 126         struct p9100_regs       __iomem *regs;
 127
 128         u32                     flags;
 129 #define P9100_FLAG_BLANKED      0x00000001
 130
 131         unsigned long           which_io;
 132 };
 133
 134 /**
 135  *      p9100_setcolreg - Optional function. Sets a color register.
 136  *      @regno: boolean, 0 copy local, 1 get_user() function
 137  *      @red: frame buffer colormap structure
 138  *      @green: The green value which can be up to 16 bits wide
 139  *      @blue:  The blue value which can be up to 16 bits wide.
 140  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 141  *      @info: frame buffer info structure
 142  */
 143 static int p9100_setcolreg(unsigned regno,
 144                            unsigned red, unsigned green, unsigned blue,
 145                            unsigned transp, struct fb_info *info)
 146 {
 147         struct p9100_par *par = (struct p9100_par *) info->par;
 148         struct p9100_regs __iomem *regs = par->regs;
 149         unsigned long flags;
 150
 151         if (regno >= 256)
 152                 return 1;
 153
 154         red >>= 8;
 155         green >>= 8;
 156         blue >>= 8;
 157
 158         spin_lock_irqsave(&par->lock, flags);
 159
 160         sbus_writel((regno << 16), &regs->ramdac_cmap_wridx);
 161         sbus_writel((red << 16), &regs->ramdac_palette_data);
 162         sbus_writel((green << 16), &regs->ramdac_palette_data);
 163         sbus_writel((blue << 16), &regs->ramdac_palette_data);
 164
 165         spin_unlock_irqrestore(&par->lock, flags);
 166
 167         return 0;
 168 }
 169
 170 /**
 171  *      p9100_blank - Optional function.  Blanks the display.
 172  *      @blank: the blank mode we want.
 173  *      @info: frame buffer structure that represents a single frame buffer
 174  */
 175 static int
 176 p9100_blank(int blank, struct fb_info *info)
 177 {
 178         struct p9100_par *par = (struct p9100_par *) info->par;
 179         struct p9100_regs __iomem *regs = par->regs;
 180         unsigned long flags;
 181         u32 val;
 182
 183         spin_lock_irqsave(&par->lock, flags);
 184
 185         switch (blank) {
 186         case FB_BLANK_UNBLANK: /* Unblanking */
 187                 val = sbus_readl(&regs->vid_screenpaint_timectl1);
 188                 val |= SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
 189                 sbus_writel(val, &regs->vid_screenpaint_timectl1);
 190                 par->flags &= ~P9100_FLAG_BLANKED;
 191                 break;
 192
 193         case FB_BLANK_NORMAL: /* Normal blanking */
 194         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
 195         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 196         case FB_BLANK_POWERDOWN: /* Poweroff */
 197                 val = sbus_readl(&regs->vid_screenpaint_timectl1);
 198                 val &= ~SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
 199                 sbus_writel(val, &regs->vid_screenpaint_timectl1);
 200                 par->flags |= P9100_FLAG_BLANKED;
 201                 break;
 202         }
 203
 204         spin_unlock_irqrestore(&par->lock, flags);
 205
 206         return 0;
 207 }
 208
 209 static const struct sbus_mmap_map p9100_mmap_map[] = {
 210         { CG3_MMAP_OFFSET,      0,              SBUS_MMAP_FBSIZE(1) },
 211         { 0,                    0,              0                   }
 212 };
 213
 214 static int p9100_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 215 {
 216         struct p9100_par *par = (struct p9100_par *)info->par;
 217
 218         return sbusfb_mmap_helper(p9100_mmap_map,
 219                                   info->fix.smem_start, info->fix.smem_len,
 220                                   par->which_io, vma);
 221 }
 222
 223 static int p9100_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 224 {
 225         /* Make it look like a cg3. */
 226         return sbusfb_ioctl_helper(cmd, arg, info,
 227                                    FBTYPE_SUN3COLOR, 8, info->fix.smem_len);
 228 }
 229
 230 /*
 231  *  Initialisation
 232  */
 233
 234 static void p9100_init_fix(struct fb_info *info, int linebytes, struct device_node *dp)
 235 {
 236         snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp);
 237
 238         info->fix.type = FB_TYPE_PACKED_PIXELS;
 239         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 240
 241         info->fix.line_length = linebytes;
 242
 243         info->fix.accel = FB_ACCEL_SUN_CGTHREE;
 244 }
 245
 246 static int p9100_probe(struct platform_device *op)
 247 {
 248         struct device_node *dp = op->dev.of_node;
 249         struct fb_info *info;
 250         struct p9100_par *par;
 251         int linebytes, err;
 252
 253         info = framebuffer_alloc(sizeof(struct p9100_par), &op->dev);
 254
 255         err = -ENOMEM;
 256         if (!info)
 257                 goto out_err;
 258         par = info->par;
 259
 260         spin_lock_init(&par->lock);
 261
 262         /* This is the framebuffer and the only resource apps can mmap.  */
 263         info->fix.smem_start = op->resource[2].start;
 264         par->which_io = op->resource[2].flags & IORESOURCE_BITS;
 265
 266         sbusfb_fill_var(&info->var, dp, 8);
 267         info->var.red.length = 8;
 268         info->var.green.length = 8;
 269         info->var.blue.length = 8;
 270
 271         linebytes = of_getintprop_default(dp, "linebytes", info->var.xres);
 272         info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
 273
 274         par->regs = of_ioremap(&op->resource[0], 0,
 275                                sizeof(struct p9100_regs), "p9100 regs");
 276         if (!par->regs)
 277                 goto out_release_fb;
 278
 279         info->fbops = &p9100_ops;
 280         info->screen_base = of_ioremap(&op->resource[2], 0,
 281                                        info->fix.smem_len, "p9100 ram");
 282         if (!info->screen_base)
 283                 goto out_unmap_regs;
 284
 285         p9100_blank(FB_BLANK_UNBLANK, info);
 286
 287         if (fb_alloc_cmap(&info->cmap, 256, 0))
 288                 goto out_unmap_screen;
 289
 290         p9100_init_fix(info, linebytes, dp);
 291
 292         err = register_framebuffer(info);
 293         if (err < 0)
 294                 goto out_dealloc_cmap;
 295
 296         fb_set_cmap(&info->cmap, info);
 297
 298         dev_set_drvdata(&op->dev, info);
 299
 300         printk(KERN_INFO "%pOF: p9100 at %lx:%lx\n",
 301                dp,
 302                par->which_io, info->fix.smem_start);
 303
 304         return 0;
 305
 306 out_dealloc_cmap:
 307         fb_dealloc_cmap(&info->cmap);
 308
 309 out_unmap_screen:
 310         of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len);
 311
 312 out_unmap_regs:
 313         of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
 314
 315 out_release_fb:
 316         framebuffer_release(info);
 317
 318 out_err:
 319         return err;
 320 }
 321
 322 static void p9100_remove(struct platform_device *op)
 323 {
 324         struct fb_info *info = dev_get_drvdata(&op->dev);
 325         struct p9100_par *par = info->par;
 326
 327         unregister_framebuffer(info);
 328         fb_dealloc_cmap(&info->cmap);
 329
 330         of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
 331         of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len);
 332
 333         framebuffer_release(info);
 334 }
 335
 336 static const struct of_device_id p9100_match[] = {
 337         {
 338                 .name = "p9100",
 339         },
 340         {},
 341 };
 342 MODULE_DEVICE_TABLE(of, p9100_match);
 343
 344 static struct platform_driver p9100_driver = {
 345         .driver = {
 346                 .name = "p9100",
 347                 .of_match_table = p9100_match,
 348         },
 349         .probe          = p9100_probe,
 350         .remove         = p9100_remove,
 351 };
 352
 353 static int __init p9100_init(void)
 354 {
 355         if (fb_get_options("p9100fb", NULL))
 356                 return -ENODEV;
 357
 358         return platform_driver_register(&p9100_driver);
 359 }
 360
 361 static void __exit p9100_exit(void)
 362 {
 363         platform_driver_unregister(&p9100_driver);
 364 }
 365
 366 module_init(p9100_init);
 367 module_exit(p9100_exit);
 368
 369 MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets");
 370 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 371 MODULE_VERSION("2.0");
 372 MODULE_LICENSE("GPL");