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