1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * drivers/video/geode/gx1fb_core.c 4 * -- Geode GX1 framebuffer driver 5 * 6 * Copyright (C) 2005 Arcom Control Systems Ltd. 7 */ 8 9 #include <linux/aperture.h> 10 #include <linux/module.h> 11 #include <linux/kernel.h> 12 #include <linux/errno.h> 13 #include <linux/string.h> 14 #include <linux/mm.h> 15 #include <linux/delay.h> 16 #include <linux/fb.h> 17 #include <linux/init.h> 18 #include <linux/pci.h> 19 20 #include "geodefb.h" 21 #include "display_gx1.h" 22 #include "video_cs5530.h" 23 24 static char mode_option[32] = "640x480-16@60"; 25 static int crt_option = 1; 26 static char panel_option[32] = ""; 27 28 /* Modes relevant to the GX1 (taken from modedb.c) */ 29 static const struct fb_videomode gx1_modedb[] = { 30 /* 640x480-60 VESA */ 31 { NULL, 60, 640, 480, 39682, 48, 16, 33, 10, 96, 2, 32 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 33 /* 640x480-75 VESA */ 34 { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3, 35 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 36 /* 640x480-85 VESA */ 37 { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3, 38 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 39 /* 800x600-60 VESA */ 40 { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4, 41 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 42 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 43 /* 800x600-75 VESA */ 44 { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3, 45 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 46 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 47 /* 800x600-85 VESA */ 48 { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3, 49 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 50 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 51 /* 1024x768-60 VESA */ 52 { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6, 53 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 54 /* 1024x768-75 VESA */ 55 { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3, 56 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 57 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 58 /* 1024x768-85 VESA */ 59 { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3, 60 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 61 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 62 /* 1280x960-60 VESA */ 63 { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3, 64 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 65 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 66 /* 1280x960-85 VESA */ 67 { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3, 68 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 69 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 70 /* 1280x1024-60 VESA */ 71 { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3, 72 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 73 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 74 /* 1280x1024-75 VESA */ 75 { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3, 76 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 77 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 78 /* 1280x1024-85 VESA */ 79 { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3, 80 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 81 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 82 }; 83 84 static int gx1_line_delta(int xres, int bpp) 85 { 86 int line_delta = xres * (bpp >> 3); 87 88 if (line_delta > 2048) 89 line_delta = 4096; 90 else if (line_delta > 1024) 91 line_delta = 2048; 92 else 93 line_delta = 1024; 94 return line_delta; 95 } 96 97 static int gx1fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 98 { 99 struct geodefb_par *par = info->par; 100 101 /* Maximum resolution is 1280x1024. */ 102 if (var->xres > 1280 || var->yres > 1024) 103 return -EINVAL; 104 105 if (par->panel_x && (var->xres > par->panel_x || var->yres > par->panel_y)) 106 return -EINVAL; 107 108 /* Only 16 bpp and 8 bpp is supported by the hardware. */ 109 if (var->bits_per_pixel == 16) { 110 var->red.offset = 11; var->red.length = 5; 111 var->green.offset = 5; var->green.length = 6; 112 var->blue.offset = 0; var->blue.length = 5; 113 var->transp.offset = 0; var->transp.length = 0; 114 } else if (var->bits_per_pixel == 8) { 115 var->red.offset = 0; var->red.length = 8; 116 var->green.offset = 0; var->green.length = 8; 117 var->blue.offset = 0; var->blue.length = 8; 118 var->transp.offset = 0; var->transp.length = 0; 119 } else 120 return -EINVAL; 121 122 /* Enough video memory? */ 123 if (gx1_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len) 124 return -EINVAL; 125 126 /* FIXME: Check timing parameters here? */ 127 128 return 0; 129 } 130 131 static int gx1fb_set_par(struct fb_info *info) 132 { 133 struct geodefb_par *par = info->par; 134 135 if (info->var.bits_per_pixel == 16) 136 info->fix.visual = FB_VISUAL_TRUECOLOR; 137 else 138 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 139 140 info->fix.line_length = gx1_line_delta(info->var.xres, info->var.bits_per_pixel); 141 142 par->dc_ops->set_mode(info); 143 144 return 0; 145 } 146 147 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) 148 { 149 chan &= 0xffff; 150 chan >>= 16 - bf->length; 151 return chan << bf->offset; 152 } 153 154 static int gx1fb_setcolreg(unsigned regno, unsigned red, unsigned green, 155 unsigned blue, unsigned transp, 156 struct fb_info *info) 157 { 158 struct geodefb_par *par = info->par; 159 160 if (info->var.grayscale) { 161 /* grayscale = 0.30*R + 0.59*G + 0.11*B */ 162 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; 163 } 164 165 /* Truecolor has hardware independent palette */ 166 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 167 u32 *pal = info->pseudo_palette; 168 u32 v; 169 170 if (regno >= 16) 171 return -EINVAL; 172 173 v = chan_to_field(red, &info->var.red); 174 v |= chan_to_field(green, &info->var.green); 175 v |= chan_to_field(blue, &info->var.blue); 176 177 pal[regno] = v; 178 } else { 179 if (regno >= 256) 180 return -EINVAL; 181 182 par->dc_ops->set_palette_reg(info, regno, red, green, blue); 183 } 184 185 return 0; 186 } 187 188 static int gx1fb_blank(int blank_mode, struct fb_info *info) 189 { 190 struct geodefb_par *par = info->par; 191 192 return par->vid_ops->blank_display(info, blank_mode); 193 } 194 195 static int gx1fb_map_video_memory(struct fb_info *info, struct pci_dev *dev) 196 { 197 struct geodefb_par *par = info->par; 198 unsigned gx_base; 199 int fb_len; 200 int ret; 201 202 gx_base = gx1_gx_base(); 203 if (!gx_base) 204 return -ENODEV; 205 206 ret = pci_enable_device(dev); 207 if (ret < 0) 208 return ret; 209 210 ret = pci_request_region(dev, 0, "gx1fb (video)"); 211 if (ret < 0) 212 return ret; 213 par->vid_regs = pci_ioremap_bar(dev, 0); 214 if (!par->vid_regs) 215 return -ENOMEM; 216 217 if (!request_mem_region(gx_base + 0x8300, 0x100, "gx1fb (display controller)")) 218 return -EBUSY; 219 par->dc_regs = ioremap(gx_base + 0x8300, 0x100); 220 if (!par->dc_regs) 221 return -ENOMEM; 222 223 if ((fb_len = gx1_frame_buffer_size()) < 0) 224 return -ENOMEM; 225 info->fix.smem_start = gx_base + 0x800000; 226 info->fix.smem_len = fb_len; 227 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len); 228 if (!info->screen_base) 229 return -ENOMEM; 230 231 dev_info(&dev->dev, "%d Kibyte of video memory at 0x%lx\n", 232 info->fix.smem_len / 1024, info->fix.smem_start); 233 234 return 0; 235 } 236 237 static int parse_panel_option(struct fb_info *info) 238 { 239 struct geodefb_par *par = info->par; 240 241 if (strcmp(panel_option, "") != 0) { 242 int x, y; 243 char *s; 244 x = simple_strtol(panel_option, &s, 10); 245 if (!x) 246 return -EINVAL; 247 y = simple_strtol(s + 1, NULL, 10); 248 if (!y) 249 return -EINVAL; 250 par->panel_x = x; 251 par->panel_y = y; 252 } 253 return 0; 254 } 255 256 static const struct fb_ops gx1fb_ops = { 257 .owner = THIS_MODULE, 258 FB_DEFAULT_IOMEM_OPS, 259 .fb_check_var = gx1fb_check_var, 260 .fb_set_par = gx1fb_set_par, 261 .fb_setcolreg = gx1fb_setcolreg, 262 .fb_blank = gx1fb_blank, 263 }; 264 265 static struct fb_info *gx1fb_init_fbinfo(struct device *dev) 266 { 267 struct geodefb_par *par; 268 struct fb_info *info; 269 270 /* Alloc enough space for the pseudo palette. */ 271 info = framebuffer_alloc(sizeof(struct geodefb_par) + sizeof(u32) * 16, dev); 272 if (!info) 273 return NULL; 274 275 par = info->par; 276 277 strcpy(info->fix.id, "GX1"); 278 279 info->fix.type = FB_TYPE_PACKED_PIXELS; 280 info->fix.type_aux = 0; 281 info->fix.xpanstep = 0; 282 info->fix.ypanstep = 0; 283 info->fix.ywrapstep = 0; 284 info->fix.accel = FB_ACCEL_NONE; 285 286 info->var.nonstd = 0; 287 info->var.activate = FB_ACTIVATE_NOW; 288 info->var.height = -1; 289 info->var.width = -1; 290 info->var.accel_flags = 0; 291 info->var.vmode = FB_VMODE_NONINTERLACED; 292 293 info->fbops = &gx1fb_ops; 294 info->node = -1; 295 296 info->pseudo_palette = (void *)par + sizeof(struct geodefb_par); 297 298 info->var.grayscale = 0; 299 300 /* CRT and panel options */ 301 par->enable_crt = crt_option; 302 if (parse_panel_option(info) < 0) 303 printk(KERN_WARNING "gx1fb: invalid 'panel' option -- disabling flat panel\n"); 304 if (!par->panel_x) 305 par->enable_crt = 1; /* fall back to CRT if no panel is specified */ 306 307 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 308 framebuffer_release(info); 309 return NULL; 310 } 311 return info; 312 } 313 314 static int gx1fb_probe(struct pci_dev *pdev, const struct pci_device_id *id) 315 { 316 struct geodefb_par *par; 317 struct fb_info *info; 318 int ret; 319 320 ret = aperture_remove_conflicting_pci_devices(pdev, "gx1fb"); 321 if (ret) 322 return ret; 323 324 info = gx1fb_init_fbinfo(&pdev->dev); 325 if (!info) 326 return -ENOMEM; 327 par = info->par; 328 329 /* GX1 display controller and CS5530 video device */ 330 par->dc_ops = &gx1_dc_ops; 331 par->vid_ops = &cs5530_vid_ops; 332 333 if ((ret = gx1fb_map_video_memory(info, pdev)) < 0) { 334 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n"); 335 goto err; 336 } 337 338 ret = fb_find_mode(&info->var, info, mode_option, 339 gx1_modedb, ARRAY_SIZE(gx1_modedb), NULL, 16); 340 if (ret == 0 || ret == 4) { 341 dev_err(&pdev->dev, "could not find valid video mode\n"); 342 ret = -EINVAL; 343 goto err; 344 } 345 346 /* Clear the frame buffer of garbage. */ 347 memset_io(info->screen_base, 0, info->fix.smem_len); 348 349 gx1fb_check_var(&info->var, info); 350 gx1fb_set_par(info); 351 352 if (register_framebuffer(info) < 0) { 353 ret = -EINVAL; 354 goto err; 355 } 356 pci_set_drvdata(pdev, info); 357 fb_info(info, "%s frame buffer device\n", info->fix.id); 358 return 0; 359 360 err: 361 if (info->screen_base) { 362 iounmap(info->screen_base); 363 pci_release_region(pdev, 0); 364 } 365 if (par->vid_regs) { 366 iounmap(par->vid_regs); 367 pci_release_region(pdev, 1); 368 } 369 if (par->dc_regs) { 370 iounmap(par->dc_regs); 371 release_mem_region(gx1_gx_base() + 0x8300, 0x100); 372 } 373 374 fb_dealloc_cmap(&info->cmap); 375 framebuffer_release(info); 376 377 return ret; 378 } 379 380 static void gx1fb_remove(struct pci_dev *pdev) 381 { 382 struct fb_info *info = pci_get_drvdata(pdev); 383 struct geodefb_par *par = info->par; 384 385 unregister_framebuffer(info); 386 387 iounmap((void __iomem *)info->screen_base); 388 pci_release_region(pdev, 0); 389 390 iounmap(par->vid_regs); 391 pci_release_region(pdev, 1); 392 393 iounmap(par->dc_regs); 394 release_mem_region(gx1_gx_base() + 0x8300, 0x100); 395 396 fb_dealloc_cmap(&info->cmap); 397 398 framebuffer_release(info); 399 } 400 401 #ifndef MODULE 402 static void __init gx1fb_setup(char *options) 403 { 404 char *this_opt; 405 406 if (!options || !*options) 407 return; 408 409 while ((this_opt = strsep(&options, ","))) { 410 if (!*this_opt) 411 continue; 412 413 if (!strncmp(this_opt, "mode:", 5)) 414 strscpy(mode_option, this_opt + 5, sizeof(mode_option)); 415 else if (!strncmp(this_opt, "crt:", 4)) 416 crt_option = !!simple_strtoul(this_opt + 4, NULL, 0); 417 else if (!strncmp(this_opt, "panel:", 6)) 418 strscpy(panel_option, this_opt + 6, sizeof(panel_option)); 419 else 420 strscpy(mode_option, this_opt, sizeof(mode_option)); 421 } 422 } 423 #endif 424 425 static struct pci_device_id gx1fb_id_table[] = { 426 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_VIDEO, 427 PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16, 428 0xff0000, 0 }, 429 { 0, } 430 }; 431 432 MODULE_DEVICE_TABLE(pci, gx1fb_id_table); 433 434 static struct pci_driver gx1fb_driver = { 435 .name = "gx1fb", 436 .id_table = gx1fb_id_table, 437 .probe = gx1fb_probe, 438 .remove = gx1fb_remove, 439 }; 440 441 static int __init gx1fb_init(void) 442 { 443 #ifndef MODULE 444 char *option = NULL; 445 #endif 446 447 if (fb_modesetting_disabled("gx1fb")) 448 return -ENODEV; 449 450 #ifndef MODULE 451 if (fb_get_options("gx1fb", &option)) 452 return -ENODEV; 453 gx1fb_setup(option); 454 #endif 455 return pci_register_driver(&gx1fb_driver); 456 } 457 458 static void gx1fb_cleanup(void) 459 { 460 pci_unregister_driver(&gx1fb_driver); 461 } 462 463 module_init(gx1fb_init); 464 module_exit(gx1fb_cleanup); 465 466 module_param_string(mode, mode_option, sizeof(mode_option), 0444); 467 MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])"); 468 469 module_param_named(crt, crt_option, int, 0444); 470 MODULE_PARM_DESC(crt, "enable CRT output. 0 = off, 1 = on (default)"); 471 472 module_param_string(panel, panel_option, sizeof(panel_option), 0444); 473 MODULE_PARM_DESC(panel, "size of attached flat panel (<x>x<y>)"); 474 475 MODULE_DESCRIPTION("framebuffer driver for the AMD Geode GX1"); 476 MODULE_LICENSE("GPL"); 477