1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * HP300 Topcat framebuffer support (derived from macfb of all things) 4 * Phil Blundell <philb@gnu.org> 1998 5 * DIO-II, colour map and Catseye support by 6 * Kars de Jong <jongk@linux-m68k.org>, May 2004. 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/mm.h> 14 #include <linux/delay.h> 15 #include <linux/init.h> 16 #include <linux/fb.h> 17 #include <linux/dio.h> 18 19 #include <asm/io.h> 20 #include <linux/uaccess.h> 21 22 static struct fb_info fb_info = { 23 .fix = { 24 .id = "HP300 ", 25 .type = FB_TYPE_PACKED_PIXELS, 26 .visual = FB_VISUAL_PSEUDOCOLOR, 27 .accel = FB_ACCEL_NONE, 28 } 29 }; 30 31 static unsigned long fb_regs; 32 static unsigned char fb_bitmask; 33 34 #define TC_NBLANK 0x4080 35 #define TC_WEN 0x4088 36 #define TC_REN 0x408c 37 #define TC_FBEN 0x4090 38 #define TC_PRR 0x40ea 39 40 /* These defines match the X window system */ 41 #define RR_CLEAR 0x0 42 #define RR_COPY 0x3 43 #define RR_NOOP 0x5 44 #define RR_XOR 0x6 45 #define RR_INVERT 0xa 46 #define RR_COPYINVERTED 0xc 47 #define RR_SET 0xf 48 49 /* blitter regs */ 50 #define BUSY 0x4044 51 #define WMRR 0x40ef 52 #define SOURCE_X 0x40f2 53 #define SOURCE_Y 0x40f6 54 #define DEST_X 0x40fa 55 #define DEST_Y 0x40fe 56 #define WHEIGHT 0x4106 57 #define WWIDTH 0x4102 58 #define WMOVE 0x409c 59 60 static struct fb_var_screeninfo hpfb_defined = { 61 .red = { 62 .length = 8, 63 }, 64 .green = { 65 .length = 8, 66 }, 67 .blue = { 68 .length = 8, 69 }, 70 .activate = FB_ACTIVATE_NOW, 71 .height = -1, 72 .width = -1, 73 .vmode = FB_VMODE_NONINTERLACED, 74 }; 75 76 static int hpfb_setcolreg(unsigned regno, unsigned red, unsigned green, 77 unsigned blue, unsigned transp, 78 struct fb_info *info) 79 { 80 /* use MSBs */ 81 unsigned char _red =red>>8; 82 unsigned char _green=green>>8; 83 unsigned char _blue =blue>>8; 84 unsigned char _regno=regno; 85 86 /* 87 * Set a single color register. The values supplied are 88 * already rounded down to the hardware's capabilities 89 * (according to the entries in the `var' structure). Return 90 * != 0 for invalid regno. 91 */ 92 93 if (regno >= info->cmap.len) 94 return 1; 95 96 while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1); 97 98 out_be16(fb_regs + 0x60ba, 0xff); 99 100 out_be16(fb_regs + 0x60b2, _red); 101 out_be16(fb_regs + 0x60b4, _green); 102 out_be16(fb_regs + 0x60b6, _blue); 103 out_be16(fb_regs + 0x60b8, ~_regno); 104 out_be16(fb_regs + 0x60f0, 0xff); 105 106 udelay(100); 107 108 while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1); 109 out_be16(fb_regs + 0x60b2, 0); 110 out_be16(fb_regs + 0x60b4, 0); 111 out_be16(fb_regs + 0x60b6, 0); 112 out_be16(fb_regs + 0x60b8, 0); 113 114 return 0; 115 } 116 117 /* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */ 118 119 static int hpfb_blank(int blank, struct fb_info *info) 120 { 121 out_8(fb_regs + TC_NBLANK, (blank ? 0x00 : fb_bitmask)); 122 123 return 0; 124 } 125 126 static void topcat_blit(int x0, int y0, int x1, int y1, int w, int h, int rr) 127 { 128 if (rr >= 0) { 129 while (in_8(fb_regs + BUSY) & fb_bitmask) 130 ; 131 } 132 out_8(fb_regs + TC_FBEN, fb_bitmask); 133 if (rr >= 0) { 134 out_8(fb_regs + TC_WEN, fb_bitmask); 135 out_8(fb_regs + WMRR, rr); 136 } 137 out_be16(fb_regs + SOURCE_X, x0); 138 out_be16(fb_regs + SOURCE_Y, y0); 139 out_be16(fb_regs + DEST_X, x1); 140 out_be16(fb_regs + DEST_Y, y1); 141 out_be16(fb_regs + WWIDTH, w); 142 out_be16(fb_regs + WHEIGHT, h); 143 out_8(fb_regs + WMOVE, fb_bitmask); 144 } 145 146 static void hpfb_copyarea(struct fb_info *info, const struct fb_copyarea *area) 147 { 148 topcat_blit(area->sx, area->sy, area->dx, area->dy, area->width, area->height, RR_COPY); 149 } 150 151 static void hpfb_fillrect(struct fb_info *p, const struct fb_fillrect *region) 152 { 153 u8 clr; 154 155 clr = region->color & 0xff; 156 157 while (in_8(fb_regs + BUSY) & fb_bitmask) 158 ; 159 160 /* Foreground */ 161 out_8(fb_regs + TC_WEN, fb_bitmask & clr); 162 out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_SET : RR_INVERT)); 163 164 /* Background */ 165 out_8(fb_regs + TC_WEN, fb_bitmask & ~clr); 166 out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_CLEAR : RR_NOOP)); 167 168 topcat_blit(region->dx, region->dy, region->dx, region->dy, region->width, region->height, -1); 169 } 170 171 static int hpfb_sync(struct fb_info *info) 172 { 173 /* 174 * Since we also access the framebuffer directly, we have to wait 175 * until the block mover is finished 176 */ 177 while (in_8(fb_regs + BUSY) & fb_bitmask) 178 ; 179 180 out_8(fb_regs + TC_WEN, fb_bitmask); 181 out_8(fb_regs + TC_PRR, RR_COPY); 182 out_8(fb_regs + TC_FBEN, fb_bitmask); 183 184 return 0; 185 } 186 187 static const struct fb_ops hpfb_ops = { 188 .owner = THIS_MODULE, 189 .fb_setcolreg = hpfb_setcolreg, 190 .fb_blank = hpfb_blank, 191 .fb_fillrect = hpfb_fillrect, 192 .fb_copyarea = hpfb_copyarea, 193 .fb_imageblit = cfb_imageblit, 194 .fb_sync = hpfb_sync, 195 }; 196 197 /* Common to all HP framebuffers */ 198 #define HPFB_FBWMSB 0x05 /* Frame buffer width */ 199 #define HPFB_FBWLSB 0x07 200 #define HPFB_FBHMSB 0x09 /* Frame buffer height */ 201 #define HPFB_FBHLSB 0x0b 202 #define HPFB_DWMSB 0x0d /* Display width */ 203 #define HPFB_DWLSB 0x0f 204 #define HPFB_DHMSB 0x11 /* Display height */ 205 #define HPFB_DHLSB 0x13 206 #define HPFB_NUMPLANES 0x5b /* Number of colour planes */ 207 #define HPFB_FBOMSB 0x5d /* Frame buffer offset */ 208 #define HPFB_FBOLSB 0x5f 209 210 static int hpfb_init_one(unsigned long phys_base, unsigned long virt_base) 211 { 212 unsigned long fboff, fb_width, fb_height, fb_start; 213 int ret; 214 215 fb_regs = virt_base; 216 fboff = (in_8(fb_regs + HPFB_FBOMSB) << 8) | in_8(fb_regs + HPFB_FBOLSB); 217 218 fb_info.fix.smem_start = (in_8(fb_regs + fboff) << 16); 219 220 if (phys_base >= DIOII_BASE) { 221 fb_info.fix.smem_start += phys_base; 222 } 223 224 if (DIO_SECID(fb_regs) != DIO_ID2_TOPCAT) { 225 /* This is the magic incantation the HP X server uses to make Catseye boards work. */ 226 while (in_be16(fb_regs+0x4800) & 1) 227 ; 228 out_be16(fb_regs+0x4800, 0); /* Catseye status */ 229 out_be16(fb_regs+0x4510, 0); /* VB */ 230 out_be16(fb_regs+0x4512, 0); /* TCNTRL */ 231 out_be16(fb_regs+0x4514, 0); /* ACNTRL */ 232 out_be16(fb_regs+0x4516, 0); /* PNCNTRL */ 233 out_be16(fb_regs+0x4206, 0x90); /* RUG Command/Status */ 234 out_be16(fb_regs+0x60a2, 0); /* Overlay Mask */ 235 out_be16(fb_regs+0x60bc, 0); /* Ram Select */ 236 } 237 238 /* 239 * Fill in the available video resolution 240 */ 241 fb_width = (in_8(fb_regs + HPFB_FBWMSB) << 8) | in_8(fb_regs + HPFB_FBWLSB); 242 fb_info.fix.line_length = fb_width; 243 fb_height = (in_8(fb_regs + HPFB_FBHMSB) << 8) | in_8(fb_regs + HPFB_FBHLSB); 244 fb_info.fix.smem_len = fb_width * fb_height; 245 fb_start = (unsigned long)ioremap_wt(fb_info.fix.smem_start, 246 fb_info.fix.smem_len); 247 hpfb_defined.xres = (in_8(fb_regs + HPFB_DWMSB) << 8) | in_8(fb_regs + HPFB_DWLSB); 248 hpfb_defined.yres = (in_8(fb_regs + HPFB_DHMSB) << 8) | in_8(fb_regs + HPFB_DHLSB); 249 hpfb_defined.xres_virtual = hpfb_defined.xres; 250 hpfb_defined.yres_virtual = hpfb_defined.yres; 251 hpfb_defined.bits_per_pixel = in_8(fb_regs + HPFB_NUMPLANES); 252 253 printk(KERN_INFO "hpfb: framebuffer at 0x%lx, mapped to 0x%lx, size %dk\n", 254 fb_info.fix.smem_start, fb_start, fb_info.fix.smem_len/1024); 255 printk(KERN_INFO "hpfb: mode is %dx%dx%d, linelength=%d\n", 256 hpfb_defined.xres, hpfb_defined.yres, hpfb_defined.bits_per_pixel, fb_info.fix.line_length); 257 258 /* 259 * Give the hardware a bit of a prod and work out how many bits per 260 * pixel are supported. 261 */ 262 out_8(fb_regs + TC_WEN, 0xff); 263 out_8(fb_regs + TC_PRR, RR_COPY); 264 out_8(fb_regs + TC_FBEN, 0xff); 265 out_8(fb_start, 0xff); 266 fb_bitmask = in_8(fb_start); 267 out_8(fb_start, 0); 268 269 /* 270 * Enable reading/writing of all the planes. 271 */ 272 out_8(fb_regs + TC_WEN, fb_bitmask); 273 out_8(fb_regs + TC_PRR, RR_COPY); 274 out_8(fb_regs + TC_REN, fb_bitmask); 275 out_8(fb_regs + TC_FBEN, fb_bitmask); 276 277 /* 278 * Clear the screen. 279 */ 280 topcat_blit(0, 0, 0, 0, fb_width, fb_height, RR_CLEAR); 281 282 /* 283 * Let there be consoles.. 284 */ 285 if (DIO_SECID(fb_regs) == DIO_ID2_TOPCAT) 286 strcat(fb_info.fix.id, "Topcat"); 287 else 288 strcat(fb_info.fix.id, "Catseye"); 289 fb_info.fbops = &hpfb_ops; 290 fb_info.var = hpfb_defined; 291 fb_info.screen_base = (char *)fb_start; 292 293 ret = fb_alloc_cmap(&fb_info.cmap, 1 << hpfb_defined.bits_per_pixel, 0); 294 if (ret < 0) 295 goto unmap_screen_base; 296 297 ret = register_framebuffer(&fb_info); 298 if (ret < 0) 299 goto dealloc_cmap; 300 301 fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id); 302 303 return 0; 304 305 dealloc_cmap: 306 fb_dealloc_cmap(&fb_info.cmap); 307 308 unmap_screen_base: 309 if (fb_info.screen_base) { 310 iounmap(fb_info.screen_base); 311 fb_info.screen_base = NULL; 312 } 313 314 return ret; 315 } 316 317 /* 318 * Check that the secondary ID indicates that we have some hope of working with this 319 * framebuffer. The catseye boards are pretty much like topcats and we can muddle through. 320 */ 321 322 #define topcat_sid_ok(x) (((x) == DIO_ID2_LRCATSEYE) || ((x) == DIO_ID2_HRCCATSEYE) \ 323 || ((x) == DIO_ID2_HRMCATSEYE) || ((x) == DIO_ID2_TOPCAT)) 324 325 /* 326 * Initialise the framebuffer 327 */ 328 static int hpfb_dio_probe(struct dio_dev *d, const struct dio_device_id *ent) 329 { 330 unsigned long paddr, vaddr; 331 332 paddr = d->resource.start; 333 if (!request_mem_region(d->resource.start, resource_size(&d->resource), d->name)) 334 return -EBUSY; 335 336 if (d->scode >= DIOII_SCBASE) { 337 vaddr = (unsigned long)ioremap(paddr, resource_size(&d->resource)); 338 } else { 339 vaddr = paddr + DIO_VIRADDRBASE; 340 } 341 printk(KERN_INFO "Topcat found at DIO select code %d " 342 "(secondary id %02x)\n", d->scode, (d->id >> 8) & 0xff); 343 if (hpfb_init_one(paddr, vaddr)) { 344 if (d->scode >= DIOII_SCBASE) 345 iounmap((void *)vaddr); 346 return -ENOMEM; 347 } 348 return 0; 349 } 350 351 static void hpfb_remove_one(struct dio_dev *d) 352 { 353 unregister_framebuffer(&fb_info); 354 if (d->scode >= DIOII_SCBASE) 355 iounmap((void *)fb_regs); 356 release_mem_region(d->resource.start, resource_size(&d->resource)); 357 fb_dealloc_cmap(&fb_info.cmap); 358 if (fb_info.screen_base) 359 iounmap(fb_info.screen_base); 360 } 361 362 static struct dio_device_id hpfb_dio_tbl[] = { 363 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_LRCATSEYE) }, 364 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRCCATSEYE) }, 365 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRMCATSEYE) }, 366 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_TOPCAT) }, 367 { 0 } 368 }; 369 370 static struct dio_driver hpfb_driver = { 371 .name = "hpfb", 372 .id_table = hpfb_dio_tbl, 373 .probe = hpfb_dio_probe, 374 .remove = hpfb_remove_one, 375 }; 376 377 static int __init hpfb_init(void) 378 { 379 unsigned int sid; 380 unsigned char i; 381 int err; 382 383 /* Topcats can be on the internal IO bus or real DIO devices. 384 * The internal variant sits at 0x560000; it has primary 385 * and secondary ID registers just like the DIO version. 386 * So we merge the two detection routines. 387 * 388 * Perhaps this #define should be in a global header file: 389 * I believe it's common to all internal fbs, not just topcat. 390 */ 391 #define INTFBVADDR 0xf0560000 392 #define INTFBPADDR 0x560000 393 394 if (!MACH_IS_HP300) 395 return -ENODEV; 396 397 if (fb_get_options("hpfb", NULL)) 398 return -ENODEV; 399 400 err = dio_register_driver(&hpfb_driver); 401 if (err) 402 return err; 403 404 err = copy_from_kernel_nofault(&i, (unsigned char *)INTFBVADDR + DIO_IDOFF, 1); 405 406 if (!err && (i == DIO_ID_FBUFFER) && topcat_sid_ok(sid = DIO_SECID(INTFBVADDR))) { 407 if (!request_mem_region(INTFBPADDR, DIO_DEVSIZE, "Internal Topcat")) 408 return -EBUSY; 409 printk(KERN_INFO "Internal Topcat found (secondary id %02x)\n", sid); 410 if (hpfb_init_one(INTFBPADDR, INTFBVADDR)) { 411 return -ENOMEM; 412 } 413 } 414 return 0; 415 } 416 417 static void __exit hpfb_cleanup_module(void) 418 { 419 dio_unregister_driver(&hpfb_driver); 420 } 421 422 module_init(hpfb_init); 423 module_exit(hpfb_cleanup_module); 424 425 MODULE_LICENSE("GPL"); 426