1 /* bw2.c: BWTWO frame buffer driver 2 * 3 * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net) 4 * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz) 5 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) 6 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) 7 * 8 * Driver layout based loosely on tgafb.c, see that file for credits. 9 */ 10 11 #include <linux/module.h> 12 #include <linux/kernel.h> 13 #include <linux/errno.h> 14 #include <linux/string.h> 15 #include <linux/delay.h> 16 #include <linux/init.h> 17 #include <linux/fb.h> 18 #include <linux/mm.h> 19 #include <linux/of_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 bw2_blank(int, struct fb_info *); 31 32 static int bw2_mmap(struct fb_info *, struct vm_area_struct *); 33 static int bw2_ioctl(struct fb_info *, unsigned int, unsigned long); 34 35 /* 36 * Frame buffer operations 37 */ 38 39 static struct fb_ops bw2_ops = { 40 .owner = THIS_MODULE, 41 .fb_blank = bw2_blank, 42 .fb_fillrect = cfb_fillrect, 43 .fb_copyarea = cfb_copyarea, 44 .fb_imageblit = cfb_imageblit, 45 .fb_mmap = bw2_mmap, 46 .fb_ioctl = bw2_ioctl, 47 #ifdef CONFIG_COMPAT 48 .fb_compat_ioctl = sbusfb_compat_ioctl, 49 #endif 50 }; 51 52 /* OBio addresses for the bwtwo registers */ 53 #define BWTWO_REGISTER_OFFSET 0x400000 54 55 struct bt_regs { 56 u32 addr; 57 u32 color_map; 58 u32 control; 59 u32 cursor; 60 }; 61 62 struct bw2_regs { 63 struct bt_regs cmap; 64 u8 control; 65 u8 status; 66 u8 cursor_start; 67 u8 cursor_end; 68 u8 h_blank_start; 69 u8 h_blank_end; 70 u8 h_sync_start; 71 u8 h_sync_end; 72 u8 comp_sync_end; 73 u8 v_blank_start_high; 74 u8 v_blank_start_low; 75 u8 v_blank_end; 76 u8 v_sync_start; 77 u8 v_sync_end; 78 u8 xfer_holdoff_start; 79 u8 xfer_holdoff_end; 80 }; 81 82 /* Status Register Constants */ 83 #define BWTWO_SR_RES_MASK 0x70 84 #define BWTWO_SR_1600_1280 0x50 85 #define BWTWO_SR_1152_900_76_A 0x40 86 #define BWTWO_SR_1152_900_76_B 0x60 87 #define BWTWO_SR_ID_MASK 0x0f 88 #define BWTWO_SR_ID_MONO 0x02 89 #define BWTWO_SR_ID_MONO_ECL 0x03 90 #define BWTWO_SR_ID_MSYNC 0x04 91 #define BWTWO_SR_ID_NOCONN 0x0a 92 93 /* Control Register Constants */ 94 #define BWTWO_CTL_ENABLE_INTS 0x80 95 #define BWTWO_CTL_ENABLE_VIDEO 0x40 96 #define BWTWO_CTL_ENABLE_TIMING 0x20 97 #define BWTWO_CTL_ENABLE_CURCMP 0x10 98 #define BWTWO_CTL_XTAL_MASK 0x0C 99 #define BWTWO_CTL_DIVISOR_MASK 0x03 100 101 /* Status Register Constants */ 102 #define BWTWO_STAT_PENDING_INT 0x80 103 #define BWTWO_STAT_MSENSE_MASK 0x70 104 #define BWTWO_STAT_ID_MASK 0x0f 105 106 struct bw2_par { 107 spinlock_t lock; 108 struct bw2_regs __iomem *regs; 109 110 u32 flags; 111 #define BW2_FLAG_BLANKED 0x00000001 112 113 unsigned long which_io; 114 }; 115 116 /** 117 * bw2_blank - Optional function. Blanks the display. 118 * @blank_mode: the blank mode we want. 119 * @info: frame buffer structure that represents a single frame buffer 120 */ 121 static int 122 bw2_blank(int blank, struct fb_info *info) 123 { 124 struct bw2_par *par = (struct bw2_par *) info->par; 125 struct bw2_regs __iomem *regs = par->regs; 126 unsigned long flags; 127 u8 val; 128 129 spin_lock_irqsave(&par->lock, flags); 130 131 switch (blank) { 132 case FB_BLANK_UNBLANK: /* Unblanking */ 133 val = sbus_readb(®s->control); 134 val |= BWTWO_CTL_ENABLE_VIDEO; 135 sbus_writeb(val, ®s->control); 136 par->flags &= ~BW2_FLAG_BLANKED; 137 break; 138 139 case FB_BLANK_NORMAL: /* Normal blanking */ 140 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */ 141 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */ 142 case FB_BLANK_POWERDOWN: /* Poweroff */ 143 val = sbus_readb(®s->control); 144 val &= ~BWTWO_CTL_ENABLE_VIDEO; 145 sbus_writeb(val, ®s->control); 146 par->flags |= BW2_FLAG_BLANKED; 147 break; 148 } 149 150 spin_unlock_irqrestore(&par->lock, flags); 151 152 return 0; 153 } 154 155 static struct sbus_mmap_map bw2_mmap_map[] = { 156 { 157 .size = SBUS_MMAP_FBSIZE(1) 158 }, 159 { .size = 0 } 160 }; 161 162 static int bw2_mmap(struct fb_info *info, struct vm_area_struct *vma) 163 { 164 struct bw2_par *par = (struct bw2_par *)info->par; 165 166 return sbusfb_mmap_helper(bw2_mmap_map, 167 info->fix.smem_start, info->fix.smem_len, 168 par->which_io, 169 vma); 170 } 171 172 static int bw2_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) 173 { 174 return sbusfb_ioctl_helper(cmd, arg, info, 175 FBTYPE_SUN2BW, 1, info->fix.smem_len); 176 } 177 178 /* 179 * Initialisation 180 */ 181 182 static void bw2_init_fix(struct fb_info *info, int linebytes) 183 { 184 strlcpy(info->fix.id, "bwtwo", sizeof(info->fix.id)); 185 186 info->fix.type = FB_TYPE_PACKED_PIXELS; 187 info->fix.visual = FB_VISUAL_MONO01; 188 189 info->fix.line_length = linebytes; 190 191 info->fix.accel = FB_ACCEL_SUN_BWTWO; 192 } 193 194 static u8 bw2regs_1600[] = { 195 0x14, 0x8b, 0x15, 0x28, 0x16, 0x03, 0x17, 0x13, 196 0x18, 0x7b, 0x19, 0x05, 0x1a, 0x34, 0x1b, 0x2e, 197 0x1c, 0x00, 0x1d, 0x0a, 0x1e, 0xff, 0x1f, 0x01, 198 0x10, 0x21, 0 199 }; 200 201 static u8 bw2regs_ecl[] = { 202 0x14, 0x65, 0x15, 0x1e, 0x16, 0x04, 0x17, 0x0c, 203 0x18, 0x5e, 0x19, 0x03, 0x1a, 0xa7, 0x1b, 0x23, 204 0x1c, 0x00, 0x1d, 0x08, 0x1e, 0xff, 0x1f, 0x01, 205 0x10, 0x20, 0 206 }; 207 208 static u8 bw2regs_analog[] = { 209 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x03, 0x17, 0x13, 210 0x18, 0xb0, 0x19, 0x03, 0x1a, 0xa6, 0x1b, 0x22, 211 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01, 212 0x10, 0x20, 0 213 }; 214 215 static u8 bw2regs_76hz[] = { 216 0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f, 217 0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a, 218 0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01, 219 0x10, 0x24, 0 220 }; 221 222 static u8 bw2regs_66hz[] = { 223 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14, 224 0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24, 225 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01, 226 0x10, 0x20, 0 227 }; 228 229 static int bw2_do_default_mode(struct bw2_par *par, struct fb_info *info, 230 int *linebytes) 231 { 232 u8 status, mon; 233 u8 *p; 234 235 status = sbus_readb(&par->regs->status); 236 mon = status & BWTWO_SR_RES_MASK; 237 switch (status & BWTWO_SR_ID_MASK) { 238 case BWTWO_SR_ID_MONO_ECL: 239 if (mon == BWTWO_SR_1600_1280) { 240 p = bw2regs_1600; 241 info->var.xres = info->var.xres_virtual = 1600; 242 info->var.yres = info->var.yres_virtual = 1280; 243 *linebytes = 1600 / 8; 244 } else 245 p = bw2regs_ecl; 246 break; 247 248 case BWTWO_SR_ID_MONO: 249 p = bw2regs_analog; 250 break; 251 252 case BWTWO_SR_ID_MSYNC: 253 if (mon == BWTWO_SR_1152_900_76_A || 254 mon == BWTWO_SR_1152_900_76_B) 255 p = bw2regs_76hz; 256 else 257 p = bw2regs_66hz; 258 break; 259 260 case BWTWO_SR_ID_NOCONN: 261 return 0; 262 263 default: 264 printk(KERN_ERR "bw2: can't handle SR %02x\n", 265 status); 266 return -EINVAL; 267 } 268 for ( ; *p; p += 2) { 269 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]]; 270 sbus_writeb(p[1], regp); 271 } 272 return 0; 273 } 274 275 static int bw2_probe(struct platform_device *op) 276 { 277 struct device_node *dp = op->dev.of_node; 278 struct fb_info *info; 279 struct bw2_par *par; 280 int linebytes, err; 281 282 info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev); 283 284 err = -ENOMEM; 285 if (!info) 286 goto out_err; 287 par = info->par; 288 289 spin_lock_init(&par->lock); 290 291 info->fix.smem_start = op->resource[0].start; 292 par->which_io = op->resource[0].flags & IORESOURCE_BITS; 293 294 sbusfb_fill_var(&info->var, dp, 1); 295 linebytes = of_getintprop_default(dp, "linebytes", 296 info->var.xres); 297 298 info->var.red.length = info->var.green.length = 299 info->var.blue.length = info->var.bits_per_pixel; 300 info->var.red.offset = info->var.green.offset = 301 info->var.blue.offset = 0; 302 303 par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET, 304 sizeof(struct bw2_regs), "bw2 regs"); 305 if (!par->regs) 306 goto out_release_fb; 307 308 if (!of_find_property(dp, "width", NULL)) { 309 err = bw2_do_default_mode(par, info, &linebytes); 310 if (err) 311 goto out_unmap_regs; 312 } 313 314 info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres); 315 316 info->flags = FBINFO_DEFAULT; 317 info->fbops = &bw2_ops; 318 319 info->screen_base = of_ioremap(&op->resource[0], 0, 320 info->fix.smem_len, "bw2 ram"); 321 if (!info->screen_base) { 322 err = -ENOMEM; 323 goto out_unmap_regs; 324 } 325 326 bw2_blank(FB_BLANK_UNBLANK, info); 327 328 bw2_init_fix(info, linebytes); 329 330 err = register_framebuffer(info); 331 if (err < 0) 332 goto out_unmap_screen; 333 334 dev_set_drvdata(&op->dev, info); 335 336 printk(KERN_INFO "%pOF: bwtwo at %lx:%lx\n", 337 dp, par->which_io, info->fix.smem_start); 338 339 return 0; 340 341 out_unmap_screen: 342 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len); 343 344 out_unmap_regs: 345 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs)); 346 347 out_release_fb: 348 framebuffer_release(info); 349 350 out_err: 351 return err; 352 } 353 354 static int bw2_remove(struct platform_device *op) 355 { 356 struct fb_info *info = dev_get_drvdata(&op->dev); 357 struct bw2_par *par = info->par; 358 359 unregister_framebuffer(info); 360 361 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs)); 362 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len); 363 364 framebuffer_release(info); 365 366 return 0; 367 } 368 369 static const struct of_device_id bw2_match[] = { 370 { 371 .name = "bwtwo", 372 }, 373 {}, 374 }; 375 MODULE_DEVICE_TABLE(of, bw2_match); 376 377 static struct platform_driver bw2_driver = { 378 .driver = { 379 .name = "bw2", 380 .of_match_table = bw2_match, 381 }, 382 .probe = bw2_probe, 383 .remove = bw2_remove, 384 }; 385 386 static int __init bw2_init(void) 387 { 388 if (fb_get_options("bw2fb", NULL)) 389 return -ENODEV; 390 391 return platform_driver_register(&bw2_driver); 392 } 393 394 static void __exit bw2_exit(void) 395 { 396 platform_driver_unregister(&bw2_driver); 397 } 398 399 module_init(bw2_init); 400 module_exit(bw2_exit); 401 402 MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets"); 403 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); 404 MODULE_VERSION("2.0"); 405 MODULE_LICENSE("GPL"); 406