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.h> 21 #include <linux/platform_device.h> 22 23 #include <asm/io.h> 24 #include <asm/fbio.h> 25 26 #include "sbuslib.h" 27 28 /* 29 * Local functions. 30 */ 31 32 static int bw2_blank(int, struct fb_info *); 33 34 static int bw2_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma); 35 static int bw2_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg); 36 37 /* 38 * Frame buffer operations 39 */ 40 41 static const struct fb_ops bw2_ops = { 42 .owner = THIS_MODULE, 43 FB_DEFAULT_SBUS_OPS(bw2), 44 .fb_blank = bw2_blank, 45 }; 46 47 /* OBio addresses for the bwtwo registers */ 48 #define BWTWO_REGISTER_OFFSET 0x400000 49 50 struct bt_regs { 51 u32 addr; 52 u32 color_map; 53 u32 control; 54 u32 cursor; 55 }; 56 57 struct bw2_regs { 58 struct bt_regs cmap; 59 u8 control; 60 u8 status; 61 u8 cursor_start; 62 u8 cursor_end; 63 u8 h_blank_start; 64 u8 h_blank_end; 65 u8 h_sync_start; 66 u8 h_sync_end; 67 u8 comp_sync_end; 68 u8 v_blank_start_high; 69 u8 v_blank_start_low; 70 u8 v_blank_end; 71 u8 v_sync_start; 72 u8 v_sync_end; 73 u8 xfer_holdoff_start; 74 u8 xfer_holdoff_end; 75 }; 76 77 /* Status Register Constants */ 78 #define BWTWO_SR_RES_MASK 0x70 79 #define BWTWO_SR_1600_1280 0x50 80 #define BWTWO_SR_1152_900_76_A 0x40 81 #define BWTWO_SR_1152_900_76_B 0x60 82 #define BWTWO_SR_ID_MASK 0x0f 83 #define BWTWO_SR_ID_MONO 0x02 84 #define BWTWO_SR_ID_MONO_ECL 0x03 85 #define BWTWO_SR_ID_MSYNC 0x04 86 #define BWTWO_SR_ID_NOCONN 0x0a 87 88 /* Control Register Constants */ 89 #define BWTWO_CTL_ENABLE_INTS 0x80 90 #define BWTWO_CTL_ENABLE_VIDEO 0x40 91 #define BWTWO_CTL_ENABLE_TIMING 0x20 92 #define BWTWO_CTL_ENABLE_CURCMP 0x10 93 #define BWTWO_CTL_XTAL_MASK 0x0C 94 #define BWTWO_CTL_DIVISOR_MASK 0x03 95 96 /* Status Register Constants */ 97 #define BWTWO_STAT_PENDING_INT 0x80 98 #define BWTWO_STAT_MSENSE_MASK 0x70 99 #define BWTWO_STAT_ID_MASK 0x0f 100 101 struct bw2_par { 102 spinlock_t lock; 103 struct bw2_regs __iomem *regs; 104 105 u32 flags; 106 #define BW2_FLAG_BLANKED 0x00000001 107 108 unsigned long which_io; 109 }; 110 111 /** 112 * bw2_blank - Optional function. Blanks the display. 113 * @blank: the blank mode we want. 114 * @info: frame buffer structure that represents a single frame buffer 115 */ 116 static int 117 bw2_blank(int blank, struct fb_info *info) 118 { 119 struct bw2_par *par = (struct bw2_par *) info->par; 120 struct bw2_regs __iomem *regs = par->regs; 121 unsigned long flags; 122 u8 val; 123 124 spin_lock_irqsave(&par->lock, flags); 125 126 switch (blank) { 127 case FB_BLANK_UNBLANK: /* Unblanking */ 128 val = sbus_readb(®s->control); 129 val |= BWTWO_CTL_ENABLE_VIDEO; 130 sbus_writeb(val, ®s->control); 131 par->flags &= ~BW2_FLAG_BLANKED; 132 break; 133 134 case FB_BLANK_NORMAL: /* Normal blanking */ 135 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */ 136 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */ 137 case FB_BLANK_POWERDOWN: /* Poweroff */ 138 val = sbus_readb(®s->control); 139 val &= ~BWTWO_CTL_ENABLE_VIDEO; 140 sbus_writeb(val, ®s->control); 141 par->flags |= BW2_FLAG_BLANKED; 142 break; 143 } 144 145 spin_unlock_irqrestore(&par->lock, flags); 146 147 return 0; 148 } 149 150 static struct sbus_mmap_map bw2_mmap_map[] = { 151 { 152 .size = SBUS_MMAP_FBSIZE(1) 153 }, 154 { .size = 0 } 155 }; 156 157 static int bw2_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma) 158 { 159 struct bw2_par *par = (struct bw2_par *)info->par; 160 161 return sbusfb_mmap_helper(bw2_mmap_map, 162 info->fix.smem_start, info->fix.smem_len, 163 par->which_io, 164 vma); 165 } 166 167 static int bw2_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) 168 { 169 return sbusfb_ioctl_helper(cmd, arg, info, 170 FBTYPE_SUN2BW, 1, info->fix.smem_len); 171 } 172 173 /* 174 * Initialisation 175 */ 176 177 static void bw2_init_fix(struct fb_info *info, int linebytes) 178 { 179 strscpy(info->fix.id, "bwtwo", sizeof(info->fix.id)); 180 181 info->fix.type = FB_TYPE_PACKED_PIXELS; 182 info->fix.visual = FB_VISUAL_MONO01; 183 184 info->fix.line_length = linebytes; 185 186 info->fix.accel = FB_ACCEL_SUN_BWTWO; 187 } 188 189 static u8 bw2regs_1600[] = { 190 0x14, 0x8b, 0x15, 0x28, 0x16, 0x03, 0x17, 0x13, 191 0x18, 0x7b, 0x19, 0x05, 0x1a, 0x34, 0x1b, 0x2e, 192 0x1c, 0x00, 0x1d, 0x0a, 0x1e, 0xff, 0x1f, 0x01, 193 0x10, 0x21, 0 194 }; 195 196 static u8 bw2regs_ecl[] = { 197 0x14, 0x65, 0x15, 0x1e, 0x16, 0x04, 0x17, 0x0c, 198 0x18, 0x5e, 0x19, 0x03, 0x1a, 0xa7, 0x1b, 0x23, 199 0x1c, 0x00, 0x1d, 0x08, 0x1e, 0xff, 0x1f, 0x01, 200 0x10, 0x20, 0 201 }; 202 203 static u8 bw2regs_analog[] = { 204 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x03, 0x17, 0x13, 205 0x18, 0xb0, 0x19, 0x03, 0x1a, 0xa6, 0x1b, 0x22, 206 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01, 207 0x10, 0x20, 0 208 }; 209 210 static u8 bw2regs_76hz[] = { 211 0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f, 212 0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a, 213 0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01, 214 0x10, 0x24, 0 215 }; 216 217 static u8 bw2regs_66hz[] = { 218 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14, 219 0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24, 220 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01, 221 0x10, 0x20, 0 222 }; 223 224 static int bw2_do_default_mode(struct bw2_par *par, struct fb_info *info, 225 int *linebytes) 226 { 227 u8 status, mon; 228 u8 *p; 229 230 status = sbus_readb(&par->regs->status); 231 mon = status & BWTWO_SR_RES_MASK; 232 switch (status & BWTWO_SR_ID_MASK) { 233 case BWTWO_SR_ID_MONO_ECL: 234 if (mon == BWTWO_SR_1600_1280) { 235 p = bw2regs_1600; 236 info->var.xres = info->var.xres_virtual = 1600; 237 info->var.yres = info->var.yres_virtual = 1280; 238 *linebytes = 1600 / 8; 239 } else 240 p = bw2regs_ecl; 241 break; 242 243 case BWTWO_SR_ID_MONO: 244 p = bw2regs_analog; 245 break; 246 247 case BWTWO_SR_ID_MSYNC: 248 if (mon == BWTWO_SR_1152_900_76_A || 249 mon == BWTWO_SR_1152_900_76_B) 250 p = bw2regs_76hz; 251 else 252 p = bw2regs_66hz; 253 break; 254 255 case BWTWO_SR_ID_NOCONN: 256 return 0; 257 258 default: 259 printk(KERN_ERR "bw2: can't handle SR %02x\n", 260 status); 261 return -EINVAL; 262 } 263 for ( ; *p; p += 2) { 264 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]]; 265 sbus_writeb(p[1], regp); 266 } 267 return 0; 268 } 269 270 static int bw2_probe(struct platform_device *op) 271 { 272 struct device_node *dp = op->dev.of_node; 273 struct fb_info *info; 274 struct bw2_par *par; 275 int linebytes, err; 276 277 info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev); 278 279 err = -ENOMEM; 280 if (!info) 281 goto out_err; 282 par = info->par; 283 284 spin_lock_init(&par->lock); 285 286 info->fix.smem_start = op->resource[0].start; 287 par->which_io = op->resource[0].flags & IORESOURCE_BITS; 288 289 sbusfb_fill_var(&info->var, dp, 1); 290 linebytes = of_getintprop_default(dp, "linebytes", 291 info->var.xres); 292 293 info->var.red.length = info->var.green.length = 294 info->var.blue.length = info->var.bits_per_pixel; 295 info->var.red.offset = info->var.green.offset = 296 info->var.blue.offset = 0; 297 298 par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET, 299 sizeof(struct bw2_regs), "bw2 regs"); 300 if (!par->regs) 301 goto out_release_fb; 302 303 if (!of_property_present(dp, "width")) { 304 err = bw2_do_default_mode(par, info, &linebytes); 305 if (err) 306 goto out_unmap_regs; 307 } 308 309 info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres); 310 311 info->fbops = &bw2_ops; 312 313 info->screen_base = of_ioremap(&op->resource[0], 0, 314 info->fix.smem_len, "bw2 ram"); 315 if (!info->screen_base) { 316 err = -ENOMEM; 317 goto out_unmap_regs; 318 } 319 320 bw2_blank(FB_BLANK_UNBLANK, info); 321 322 bw2_init_fix(info, linebytes); 323 324 err = register_framebuffer(info); 325 if (err < 0) 326 goto out_unmap_screen; 327 328 dev_set_drvdata(&op->dev, info); 329 330 printk(KERN_INFO "%pOF: bwtwo at %lx:%lx\n", 331 dp, par->which_io, info->fix.smem_start); 332 333 return 0; 334 335 out_unmap_screen: 336 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len); 337 338 out_unmap_regs: 339 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs)); 340 341 out_release_fb: 342 framebuffer_release(info); 343 344 out_err: 345 return err; 346 } 347 348 static void bw2_remove(struct platform_device *op) 349 { 350 struct fb_info *info = dev_get_drvdata(&op->dev); 351 struct bw2_par *par = info->par; 352 353 unregister_framebuffer(info); 354 355 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs)); 356 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len); 357 358 framebuffer_release(info); 359 } 360 361 static const struct of_device_id bw2_match[] = { 362 { 363 .name = "bwtwo", 364 }, 365 {}, 366 }; 367 MODULE_DEVICE_TABLE(of, bw2_match); 368 369 static struct platform_driver bw2_driver = { 370 .driver = { 371 .name = "bw2", 372 .of_match_table = bw2_match, 373 }, 374 .probe = bw2_probe, 375 .remove_new = bw2_remove, 376 }; 377 378 static int __init bw2_init(void) 379 { 380 if (fb_get_options("bw2fb", NULL)) 381 return -ENODEV; 382 383 return platform_driver_register(&bw2_driver); 384 } 385 386 static void __exit bw2_exit(void) 387 { 388 platform_driver_unregister(&bw2_driver); 389 } 390 391 module_init(bw2_init); 392 module_exit(bw2_exit); 393 394 MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets"); 395 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); 396 MODULE_VERSION("2.0"); 397 MODULE_LICENSE("GPL"); 398