1 // SPDX-License-Identifier: GPL-2.0-only 2 /* bw2.c: BWTWO 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 bw2_blank(int, struct fb_info *); 32 33 static int bw2_mmap(struct fb_info *, struct vm_area_struct *); 34 static int bw2_ioctl(struct fb_info *, unsigned int, unsigned long); 35 36 /* 37 * Frame buffer operations 38 */ 39 40 static const struct fb_ops bw2_ops = { 41 .owner = THIS_MODULE, 42 .fb_blank = bw2_blank, 43 .fb_fillrect = cfb_fillrect, 44 .fb_copyarea = cfb_copyarea, 45 .fb_imageblit = cfb_imageblit, 46 .fb_mmap = bw2_mmap, 47 .fb_ioctl = bw2_ioctl, 48 #ifdef CONFIG_COMPAT 49 .fb_compat_ioctl = sbusfb_compat_ioctl, 50 #endif 51 }; 52 53 /* OBio addresses for the bwtwo registers */ 54 #define BWTWO_REGISTER_OFFSET 0x400000 55 56 struct bt_regs { 57 u32 addr; 58 u32 color_map; 59 u32 control; 60 u32 cursor; 61 }; 62 63 struct bw2_regs { 64 struct bt_regs cmap; 65 u8 control; 66 u8 status; 67 u8 cursor_start; 68 u8 cursor_end; 69 u8 h_blank_start; 70 u8 h_blank_end; 71 u8 h_sync_start; 72 u8 h_sync_end; 73 u8 comp_sync_end; 74 u8 v_blank_start_high; 75 u8 v_blank_start_low; 76 u8 v_blank_end; 77 u8 v_sync_start; 78 u8 v_sync_end; 79 u8 xfer_holdoff_start; 80 u8 xfer_holdoff_end; 81 }; 82 83 /* Status Register Constants */ 84 #define BWTWO_SR_RES_MASK 0x70 85 #define BWTWO_SR_1600_1280 0x50 86 #define BWTWO_SR_1152_900_76_A 0x40 87 #define BWTWO_SR_1152_900_76_B 0x60 88 #define BWTWO_SR_ID_MASK 0x0f 89 #define BWTWO_SR_ID_MONO 0x02 90 #define BWTWO_SR_ID_MONO_ECL 0x03 91 #define BWTWO_SR_ID_MSYNC 0x04 92 #define BWTWO_SR_ID_NOCONN 0x0a 93 94 /* Control Register Constants */ 95 #define BWTWO_CTL_ENABLE_INTS 0x80 96 #define BWTWO_CTL_ENABLE_VIDEO 0x40 97 #define BWTWO_CTL_ENABLE_TIMING 0x20 98 #define BWTWO_CTL_ENABLE_CURCMP 0x10 99 #define BWTWO_CTL_XTAL_MASK 0x0C 100 #define BWTWO_CTL_DIVISOR_MASK 0x03 101 102 /* Status Register Constants */ 103 #define BWTWO_STAT_PENDING_INT 0x80 104 #define BWTWO_STAT_MSENSE_MASK 0x70 105 #define BWTWO_STAT_ID_MASK 0x0f 106 107 struct bw2_par { 108 spinlock_t lock; 109 struct bw2_regs __iomem *regs; 110 111 u32 flags; 112 #define BW2_FLAG_BLANKED 0x00000001 113 114 unsigned long which_io; 115 }; 116 117 /** 118 * bw2_blank - Optional function. Blanks the display. 119 * @blank: the blank mode we want. 120 * @info: frame buffer structure that represents a single frame buffer 121 */ 122 static int 123 bw2_blank(int blank, struct fb_info *info) 124 { 125 struct bw2_par *par = (struct bw2_par *) info->par; 126 struct bw2_regs __iomem *regs = par->regs; 127 unsigned long flags; 128 u8 val; 129 130 spin_lock_irqsave(&par->lock, flags); 131 132 switch (blank) { 133 case FB_BLANK_UNBLANK: /* Unblanking */ 134 val = sbus_readb(®s->control); 135 val |= BWTWO_CTL_ENABLE_VIDEO; 136 sbus_writeb(val, ®s->control); 137 par->flags &= ~BW2_FLAG_BLANKED; 138 break; 139 140 case FB_BLANK_NORMAL: /* Normal blanking */ 141 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */ 142 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */ 143 case FB_BLANK_POWERDOWN: /* Poweroff */ 144 val = sbus_readb(®s->control); 145 val &= ~BWTWO_CTL_ENABLE_VIDEO; 146 sbus_writeb(val, ®s->control); 147 par->flags |= BW2_FLAG_BLANKED; 148 break; 149 } 150 151 spin_unlock_irqrestore(&par->lock, flags); 152 153 return 0; 154 } 155 156 static struct sbus_mmap_map bw2_mmap_map[] = { 157 { 158 .size = SBUS_MMAP_FBSIZE(1) 159 }, 160 { .size = 0 } 161 }; 162 163 static int bw2_mmap(struct fb_info *info, struct vm_area_struct *vma) 164 { 165 struct bw2_par *par = (struct bw2_par *)info->par; 166 167 return sbusfb_mmap_helper(bw2_mmap_map, 168 info->fix.smem_start, info->fix.smem_len, 169 par->which_io, 170 vma); 171 } 172 173 static int bw2_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) 174 { 175 return sbusfb_ioctl_helper(cmd, arg, info, 176 FBTYPE_SUN2BW, 1, info->fix.smem_len); 177 } 178 179 /* 180 * Initialisation 181 */ 182 183 static void bw2_init_fix(struct fb_info *info, int linebytes) 184 { 185 strlcpy(info->fix.id, "bwtwo", sizeof(info->fix.id)); 186 187 info->fix.type = FB_TYPE_PACKED_PIXELS; 188 info->fix.visual = FB_VISUAL_MONO01; 189 190 info->fix.line_length = linebytes; 191 192 info->fix.accel = FB_ACCEL_SUN_BWTWO; 193 } 194 195 static u8 bw2regs_1600[] = { 196 0x14, 0x8b, 0x15, 0x28, 0x16, 0x03, 0x17, 0x13, 197 0x18, 0x7b, 0x19, 0x05, 0x1a, 0x34, 0x1b, 0x2e, 198 0x1c, 0x00, 0x1d, 0x0a, 0x1e, 0xff, 0x1f, 0x01, 199 0x10, 0x21, 0 200 }; 201 202 static u8 bw2regs_ecl[] = { 203 0x14, 0x65, 0x15, 0x1e, 0x16, 0x04, 0x17, 0x0c, 204 0x18, 0x5e, 0x19, 0x03, 0x1a, 0xa7, 0x1b, 0x23, 205 0x1c, 0x00, 0x1d, 0x08, 0x1e, 0xff, 0x1f, 0x01, 206 0x10, 0x20, 0 207 }; 208 209 static u8 bw2regs_analog[] = { 210 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x03, 0x17, 0x13, 211 0x18, 0xb0, 0x19, 0x03, 0x1a, 0xa6, 0x1b, 0x22, 212 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01, 213 0x10, 0x20, 0 214 }; 215 216 static u8 bw2regs_76hz[] = { 217 0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f, 218 0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a, 219 0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01, 220 0x10, 0x24, 0 221 }; 222 223 static u8 bw2regs_66hz[] = { 224 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14, 225 0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24, 226 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01, 227 0x10, 0x20, 0 228 }; 229 230 static int bw2_do_default_mode(struct bw2_par *par, struct fb_info *info, 231 int *linebytes) 232 { 233 u8 status, mon; 234 u8 *p; 235 236 status = sbus_readb(&par->regs->status); 237 mon = status & BWTWO_SR_RES_MASK; 238 switch (status & BWTWO_SR_ID_MASK) { 239 case BWTWO_SR_ID_MONO_ECL: 240 if (mon == BWTWO_SR_1600_1280) { 241 p = bw2regs_1600; 242 info->var.xres = info->var.xres_virtual = 1600; 243 info->var.yres = info->var.yres_virtual = 1280; 244 *linebytes = 1600 / 8; 245 } else 246 p = bw2regs_ecl; 247 break; 248 249 case BWTWO_SR_ID_MONO: 250 p = bw2regs_analog; 251 break; 252 253 case BWTWO_SR_ID_MSYNC: 254 if (mon == BWTWO_SR_1152_900_76_A || 255 mon == BWTWO_SR_1152_900_76_B) 256 p = bw2regs_76hz; 257 else 258 p = bw2regs_66hz; 259 break; 260 261 case BWTWO_SR_ID_NOCONN: 262 return 0; 263 264 default: 265 printk(KERN_ERR "bw2: can't handle SR %02x\n", 266 status); 267 return -EINVAL; 268 } 269 for ( ; *p; p += 2) { 270 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]]; 271 sbus_writeb(p[1], regp); 272 } 273 return 0; 274 } 275 276 static int bw2_probe(struct platform_device *op) 277 { 278 struct device_node *dp = op->dev.of_node; 279 struct fb_info *info; 280 struct bw2_par *par; 281 int linebytes, err; 282 283 info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev); 284 285 err = -ENOMEM; 286 if (!info) 287 goto out_err; 288 par = info->par; 289 290 spin_lock_init(&par->lock); 291 292 info->fix.smem_start = op->resource[0].start; 293 par->which_io = op->resource[0].flags & IORESOURCE_BITS; 294 295 sbusfb_fill_var(&info->var, dp, 1); 296 linebytes = of_getintprop_default(dp, "linebytes", 297 info->var.xres); 298 299 info->var.red.length = info->var.green.length = 300 info->var.blue.length = info->var.bits_per_pixel; 301 info->var.red.offset = info->var.green.offset = 302 info->var.blue.offset = 0; 303 304 par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET, 305 sizeof(struct bw2_regs), "bw2 regs"); 306 if (!par->regs) 307 goto out_release_fb; 308 309 if (!of_find_property(dp, "width", NULL)) { 310 err = bw2_do_default_mode(par, info, &linebytes); 311 if (err) 312 goto out_unmap_regs; 313 } 314 315 info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres); 316 317 info->flags = FBINFO_DEFAULT; 318 info->fbops = &bw2_ops; 319 320 info->screen_base = of_ioremap(&op->resource[0], 0, 321 info->fix.smem_len, "bw2 ram"); 322 if (!info->screen_base) { 323 err = -ENOMEM; 324 goto out_unmap_regs; 325 } 326 327 bw2_blank(FB_BLANK_UNBLANK, info); 328 329 bw2_init_fix(info, linebytes); 330 331 err = register_framebuffer(info); 332 if (err < 0) 333 goto out_unmap_screen; 334 335 dev_set_drvdata(&op->dev, info); 336 337 printk(KERN_INFO "%pOF: bwtwo at %lx:%lx\n", 338 dp, par->which_io, info->fix.smem_start); 339 340 return 0; 341 342 out_unmap_screen: 343 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len); 344 345 out_unmap_regs: 346 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs)); 347 348 out_release_fb: 349 framebuffer_release(info); 350 351 out_err: 352 return err; 353 } 354 355 static int bw2_remove(struct platform_device *op) 356 { 357 struct fb_info *info = dev_get_drvdata(&op->dev); 358 struct bw2_par *par = info->par; 359 360 unregister_framebuffer(info); 361 362 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs)); 363 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len); 364 365 framebuffer_release(info); 366 367 return 0; 368 } 369 370 static const struct of_device_id bw2_match[] = { 371 { 372 .name = "bwtwo", 373 }, 374 {}, 375 }; 376 MODULE_DEVICE_TABLE(of, bw2_match); 377 378 static struct platform_driver bw2_driver = { 379 .driver = { 380 .name = "bw2", 381 .of_match_table = bw2_match, 382 }, 383 .probe = bw2_probe, 384 .remove = bw2_remove, 385 }; 386 387 static int __init bw2_init(void) 388 { 389 if (fb_get_options("bw2fb", NULL)) 390 return -ENODEV; 391 392 return platform_driver_register(&bw2_driver); 393 } 394 395 static void __exit bw2_exit(void) 396 { 397 platform_driver_unregister(&bw2_driver); 398 } 399 400 module_init(bw2_init); 401 module_exit(bw2_exit); 402 403 MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets"); 404 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); 405 MODULE_VERSION("2.0"); 406 MODULE_LICENSE("GPL"); 407