1 // SPDX-License-Identifier: GPL-2.0-only 2 /* cg3.c: CGTHREE 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 cg3_setcolreg(unsigned, unsigned, unsigned, unsigned, 32 unsigned, struct fb_info *); 33 static int cg3_blank(int, struct fb_info *); 34 35 static int cg3_mmap(struct fb_info *, struct vm_area_struct *); 36 static int cg3_ioctl(struct fb_info *, unsigned int, unsigned long); 37 38 /* 39 * Frame buffer operations 40 */ 41 42 static const struct fb_ops cg3_ops = { 43 .owner = THIS_MODULE, 44 .fb_setcolreg = cg3_setcolreg, 45 .fb_blank = cg3_blank, 46 .fb_fillrect = cfb_fillrect, 47 .fb_copyarea = cfb_copyarea, 48 .fb_imageblit = cfb_imageblit, 49 .fb_mmap = cg3_mmap, 50 .fb_ioctl = cg3_ioctl, 51 #ifdef CONFIG_COMPAT 52 .fb_compat_ioctl = sbusfb_compat_ioctl, 53 #endif 54 }; 55 56 57 /* Control Register Constants */ 58 #define CG3_CR_ENABLE_INTS 0x80 59 #define CG3_CR_ENABLE_VIDEO 0x40 60 #define CG3_CR_ENABLE_TIMING 0x20 61 #define CG3_CR_ENABLE_CURCMP 0x10 62 #define CG3_CR_XTAL_MASK 0x0c 63 #define CG3_CR_DIVISOR_MASK 0x03 64 65 /* Status Register Constants */ 66 #define CG3_SR_PENDING_INT 0x80 67 #define CG3_SR_RES_MASK 0x70 68 #define CG3_SR_1152_900_76_A 0x40 69 #define CG3_SR_1152_900_76_B 0x60 70 #define CG3_SR_ID_MASK 0x0f 71 #define CG3_SR_ID_COLOR 0x01 72 #define CG3_SR_ID_MONO 0x02 73 #define CG3_SR_ID_MONO_ECL 0x03 74 75 enum cg3_type { 76 CG3_AT_66HZ = 0, 77 CG3_AT_76HZ, 78 CG3_RDI 79 }; 80 81 struct bt_regs { 82 u32 addr; 83 u32 color_map; 84 u32 control; 85 u32 cursor; 86 }; 87 88 struct cg3_regs { 89 struct bt_regs cmap; 90 u8 control; 91 u8 status; 92 u8 cursor_start; 93 u8 cursor_end; 94 u8 h_blank_start; 95 u8 h_blank_end; 96 u8 h_sync_start; 97 u8 h_sync_end; 98 u8 comp_sync_end; 99 u8 v_blank_start_high; 100 u8 v_blank_start_low; 101 u8 v_blank_end; 102 u8 v_sync_start; 103 u8 v_sync_end; 104 u8 xfer_holdoff_start; 105 u8 xfer_holdoff_end; 106 }; 107 108 /* Offset of interesting structures in the OBIO space */ 109 #define CG3_REGS_OFFSET 0x400000UL 110 #define CG3_RAM_OFFSET 0x800000UL 111 112 struct cg3_par { 113 spinlock_t lock; 114 struct cg3_regs __iomem *regs; 115 u32 sw_cmap[((256 * 3) + 3) / 4]; 116 117 u32 flags; 118 #define CG3_FLAG_BLANKED 0x00000001 119 #define CG3_FLAG_RDI 0x00000002 120 121 unsigned long which_io; 122 }; 123 124 /** 125 * cg3_setcolreg - Optional function. Sets a color register. 126 * @regno: boolean, 0 copy local, 1 get_user() function 127 * @red: frame buffer colormap structure 128 * @green: The green value which can be up to 16 bits wide 129 * @blue: The blue value which can be up to 16 bits wide. 130 * @transp: If supported the alpha value which can be up to 16 bits wide. 131 * @info: frame buffer info structure 132 * 133 * The cg3 palette is loaded with 4 color values at each time 134 * so you end up with: (rgb)(r), (gb)(rg), (b)(rgb), and so on. 135 * We keep a sw copy of the hw cmap to assist us in this esoteric 136 * loading procedure. 137 */ 138 static int cg3_setcolreg(unsigned regno, 139 unsigned red, unsigned green, unsigned blue, 140 unsigned transp, struct fb_info *info) 141 { 142 struct cg3_par *par = (struct cg3_par *) info->par; 143 struct bt_regs __iomem *bt = &par->regs->cmap; 144 unsigned long flags; 145 u32 *p32; 146 u8 *p8; 147 int count; 148 149 if (regno >= 256) 150 return 1; 151 152 red >>= 8; 153 green >>= 8; 154 blue >>= 8; 155 156 spin_lock_irqsave(&par->lock, flags); 157 158 p8 = (u8 *)par->sw_cmap + (regno * 3); 159 p8[0] = red; 160 p8[1] = green; 161 p8[2] = blue; 162 163 #define D4M3(x) ((((x)>>2)<<1) + ((x)>>2)) /* (x/4)*3 */ 164 #define D4M4(x) ((x)&~0x3) /* (x/4)*4 */ 165 166 count = 3; 167 p32 = &par->sw_cmap[D4M3(regno)]; 168 sbus_writel(D4M4(regno), &bt->addr); 169 while (count--) 170 sbus_writel(*p32++, &bt->color_map); 171 172 #undef D4M3 173 #undef D4M4 174 175 spin_unlock_irqrestore(&par->lock, flags); 176 177 return 0; 178 } 179 180 /** 181 * cg3_blank - Optional function. Blanks the display. 182 * @blank: the blank mode we want. 183 * @info: frame buffer structure that represents a single frame buffer 184 */ 185 static int cg3_blank(int blank, struct fb_info *info) 186 { 187 struct cg3_par *par = (struct cg3_par *) info->par; 188 struct cg3_regs __iomem *regs = par->regs; 189 unsigned long flags; 190 u8 val; 191 192 spin_lock_irqsave(&par->lock, flags); 193 194 switch (blank) { 195 case FB_BLANK_UNBLANK: /* Unblanking */ 196 val = sbus_readb(®s->control); 197 val |= CG3_CR_ENABLE_VIDEO; 198 sbus_writeb(val, ®s->control); 199 par->flags &= ~CG3_FLAG_BLANKED; 200 break; 201 202 case FB_BLANK_NORMAL: /* Normal blanking */ 203 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */ 204 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */ 205 case FB_BLANK_POWERDOWN: /* Poweroff */ 206 val = sbus_readb(®s->control); 207 val &= ~CG3_CR_ENABLE_VIDEO; 208 sbus_writeb(val, ®s->control); 209 par->flags |= CG3_FLAG_BLANKED; 210 break; 211 } 212 213 spin_unlock_irqrestore(&par->lock, flags); 214 215 return 0; 216 } 217 218 static struct sbus_mmap_map cg3_mmap_map[] = { 219 { 220 .voff = CG3_MMAP_OFFSET, 221 .poff = CG3_RAM_OFFSET, 222 .size = SBUS_MMAP_FBSIZE(1) 223 }, 224 { .size = 0 } 225 }; 226 227 static int cg3_mmap(struct fb_info *info, struct vm_area_struct *vma) 228 { 229 struct cg3_par *par = (struct cg3_par *)info->par; 230 231 return sbusfb_mmap_helper(cg3_mmap_map, 232 info->fix.smem_start, info->fix.smem_len, 233 par->which_io, 234 vma); 235 } 236 237 static int cg3_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) 238 { 239 return sbusfb_ioctl_helper(cmd, arg, info, 240 FBTYPE_SUN3COLOR, 8, info->fix.smem_len); 241 } 242 243 /* 244 * Initialisation 245 */ 246 247 static void cg3_init_fix(struct fb_info *info, int linebytes, 248 struct device_node *dp) 249 { 250 snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp); 251 252 info->fix.type = FB_TYPE_PACKED_PIXELS; 253 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 254 255 info->fix.line_length = linebytes; 256 257 info->fix.accel = FB_ACCEL_SUN_CGTHREE; 258 } 259 260 static void cg3_rdi_maybe_fixup_var(struct fb_var_screeninfo *var, 261 struct device_node *dp) 262 { 263 const char *params; 264 char *p; 265 int ww, hh; 266 267 params = of_get_property(dp, "params", NULL); 268 if (params) { 269 ww = simple_strtoul(params, &p, 10); 270 if (ww && *p == 'x') { 271 hh = simple_strtoul(p + 1, &p, 10); 272 if (hh && *p == '-') { 273 if (var->xres != ww || 274 var->yres != hh) { 275 var->xres = var->xres_virtual = ww; 276 var->yres = var->yres_virtual = hh; 277 } 278 } 279 } 280 } 281 } 282 283 static u8 cg3regvals_66hz[] = { /* 1152 x 900, 66 Hz */ 284 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14, 285 0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24, 286 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01, 287 0x10, 0x20, 0 288 }; 289 290 static u8 cg3regvals_76hz[] = { /* 1152 x 900, 76 Hz */ 291 0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f, 292 0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a, 293 0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01, 294 0x10, 0x24, 0 295 }; 296 297 static u8 cg3regvals_rdi[] = { /* 640 x 480, cgRDI */ 298 0x14, 0x70, 0x15, 0x20, 0x16, 0x08, 0x17, 0x10, 299 0x18, 0x06, 0x19, 0x02, 0x1a, 0x31, 0x1b, 0x51, 300 0x1c, 0x06, 0x1d, 0x0c, 0x1e, 0xff, 0x1f, 0x01, 301 0x10, 0x22, 0 302 }; 303 304 static u8 *cg3_regvals[] = { 305 cg3regvals_66hz, cg3regvals_76hz, cg3regvals_rdi 306 }; 307 308 static u_char cg3_dacvals[] = { 309 4, 0xff, 5, 0x00, 6, 0x70, 7, 0x00, 0 310 }; 311 312 static int cg3_do_default_mode(struct cg3_par *par) 313 { 314 enum cg3_type type; 315 u8 *p; 316 317 if (par->flags & CG3_FLAG_RDI) 318 type = CG3_RDI; 319 else { 320 u8 status = sbus_readb(&par->regs->status), mon; 321 if ((status & CG3_SR_ID_MASK) == CG3_SR_ID_COLOR) { 322 mon = status & CG3_SR_RES_MASK; 323 if (mon == CG3_SR_1152_900_76_A || 324 mon == CG3_SR_1152_900_76_B) 325 type = CG3_AT_76HZ; 326 else 327 type = CG3_AT_66HZ; 328 } else { 329 printk(KERN_ERR "cgthree: can't handle SR %02x\n", 330 status); 331 return -EINVAL; 332 } 333 } 334 335 for (p = cg3_regvals[type]; *p; p += 2) { 336 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]]; 337 sbus_writeb(p[1], regp); 338 } 339 for (p = cg3_dacvals; *p; p += 2) { 340 u8 __iomem *regp; 341 342 regp = (u8 __iomem *)&par->regs->cmap.addr; 343 sbus_writeb(p[0], regp); 344 regp = (u8 __iomem *)&par->regs->cmap.control; 345 sbus_writeb(p[1], regp); 346 } 347 return 0; 348 } 349 350 static int cg3_probe(struct platform_device *op) 351 { 352 struct device_node *dp = op->dev.of_node; 353 struct fb_info *info; 354 struct cg3_par *par; 355 int linebytes, err; 356 357 info = framebuffer_alloc(sizeof(struct cg3_par), &op->dev); 358 359 err = -ENOMEM; 360 if (!info) 361 goto out_err; 362 par = info->par; 363 364 spin_lock_init(&par->lock); 365 366 info->fix.smem_start = op->resource[0].start; 367 par->which_io = op->resource[0].flags & IORESOURCE_BITS; 368 369 sbusfb_fill_var(&info->var, dp, 8); 370 info->var.red.length = 8; 371 info->var.green.length = 8; 372 info->var.blue.length = 8; 373 if (of_node_name_eq(dp, "cgRDI")) 374 par->flags |= CG3_FLAG_RDI; 375 if (par->flags & CG3_FLAG_RDI) 376 cg3_rdi_maybe_fixup_var(&info->var, dp); 377 378 linebytes = of_getintprop_default(dp, "linebytes", 379 info->var.xres); 380 info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres); 381 382 par->regs = of_ioremap(&op->resource[0], CG3_REGS_OFFSET, 383 sizeof(struct cg3_regs), "cg3 regs"); 384 if (!par->regs) 385 goto out_release_fb; 386 387 info->flags = FBINFO_DEFAULT; 388 info->fbops = &cg3_ops; 389 info->screen_base = of_ioremap(&op->resource[0], CG3_RAM_OFFSET, 390 info->fix.smem_len, "cg3 ram"); 391 if (!info->screen_base) 392 goto out_unmap_regs; 393 394 cg3_blank(FB_BLANK_UNBLANK, info); 395 396 if (!of_property_present(dp, "width")) { 397 err = cg3_do_default_mode(par); 398 if (err) 399 goto out_unmap_screen; 400 } 401 402 err = fb_alloc_cmap(&info->cmap, 256, 0); 403 if (err) 404 goto out_unmap_screen; 405 406 fb_set_cmap(&info->cmap, info); 407 408 cg3_init_fix(info, linebytes, dp); 409 410 err = register_framebuffer(info); 411 if (err < 0) 412 goto out_dealloc_cmap; 413 414 dev_set_drvdata(&op->dev, info); 415 416 printk(KERN_INFO "%pOF: cg3 at %lx:%lx\n", 417 dp, par->which_io, info->fix.smem_start); 418 419 return 0; 420 421 out_dealloc_cmap: 422 fb_dealloc_cmap(&info->cmap); 423 424 out_unmap_screen: 425 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len); 426 427 out_unmap_regs: 428 of_iounmap(&op->resource[0], par->regs, sizeof(struct cg3_regs)); 429 430 out_release_fb: 431 framebuffer_release(info); 432 433 out_err: 434 return err; 435 } 436 437 static int cg3_remove(struct platform_device *op) 438 { 439 struct fb_info *info = dev_get_drvdata(&op->dev); 440 struct cg3_par *par = info->par; 441 442 unregister_framebuffer(info); 443 fb_dealloc_cmap(&info->cmap); 444 445 of_iounmap(&op->resource[0], par->regs, sizeof(struct cg3_regs)); 446 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len); 447 448 framebuffer_release(info); 449 450 return 0; 451 } 452 453 static const struct of_device_id cg3_match[] = { 454 { 455 .name = "cgthree", 456 }, 457 { 458 .name = "cgRDI", 459 }, 460 {}, 461 }; 462 MODULE_DEVICE_TABLE(of, cg3_match); 463 464 static struct platform_driver cg3_driver = { 465 .driver = { 466 .name = "cg3", 467 .of_match_table = cg3_match, 468 }, 469 .probe = cg3_probe, 470 .remove = cg3_remove, 471 }; 472 473 static int __init cg3_init(void) 474 { 475 if (fb_get_options("cg3fb", NULL)) 476 return -ENODEV; 477 478 return platform_driver_register(&cg3_driver); 479 } 480 481 static void __exit cg3_exit(void) 482 { 483 platform_driver_unregister(&cg3_driver); 484 } 485 486 module_init(cg3_init); 487 module_exit(cg3_exit); 488 489 MODULE_DESCRIPTION("framebuffer driver for CGthree chipsets"); 490 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); 491 MODULE_VERSION("2.0"); 492 MODULE_LICENSE("GPL"); 493