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