1 // SPDX-License-Identifier: GPL-2.0-only 2 /* p9100.c: P9100 frame buffer driver 3 * 4 * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net) 5 * Copyright 1999 Derrick J Brashear (shadow@dementia.org) 6 * 7 * Driver layout based loosely on tgafb.c, see that file for credits. 8 */ 9 10 #include <linux/module.h> 11 #include <linux/kernel.h> 12 #include <linux/errno.h> 13 #include <linux/string.h> 14 #include <linux/delay.h> 15 #include <linux/init.h> 16 #include <linux/fb.h> 17 #include <linux/mm.h> 18 #include <linux/of_device.h> 19 20 #include <asm/io.h> 21 #include <asm/fbio.h> 22 23 #include "sbuslib.h" 24 25 /* 26 * Local functions. 27 */ 28 29 static int p9100_setcolreg(unsigned, unsigned, unsigned, unsigned, 30 unsigned, struct fb_info *); 31 static int p9100_blank(int, struct fb_info *); 32 33 static int p9100_mmap(struct fb_info *, struct vm_area_struct *); 34 static int p9100_ioctl(struct fb_info *, unsigned int, unsigned long); 35 36 /* 37 * Frame buffer operations 38 */ 39 40 static const struct fb_ops p9100_ops = { 41 .owner = THIS_MODULE, 42 .fb_setcolreg = p9100_setcolreg, 43 .fb_blank = p9100_blank, 44 .fb_fillrect = cfb_fillrect, 45 .fb_copyarea = cfb_copyarea, 46 .fb_imageblit = cfb_imageblit, 47 .fb_mmap = p9100_mmap, 48 .fb_ioctl = p9100_ioctl, 49 #ifdef CONFIG_COMPAT 50 .fb_compat_ioctl = sbusfb_compat_ioctl, 51 #endif 52 }; 53 54 /* P9100 control registers */ 55 #define P9100_SYSCTL_OFF 0x0UL 56 #define P9100_VIDEOCTL_OFF 0x100UL 57 #define P9100_VRAMCTL_OFF 0x180UL 58 #define P9100_RAMDAC_OFF 0x200UL 59 #define P9100_VIDEOCOPROC_OFF 0x400UL 60 61 /* P9100 command registers */ 62 #define P9100_CMD_OFF 0x0UL 63 64 /* P9100 framebuffer memory */ 65 #define P9100_FB_OFF 0x0UL 66 67 /* 3 bits: 2=8bpp 3=16bpp 5=32bpp 7=24bpp */ 68 #define SYS_CONFIG_PIXELSIZE_SHIFT 26 69 70 #define SCREENPAINT_TIMECTL1_ENABLE_VIDEO 0x20 /* 0 = off, 1 = on */ 71 72 struct p9100_regs { 73 /* Registers for the system control */ 74 u32 sys_base; 75 u32 sys_config; 76 u32 sys_intr; 77 u32 sys_int_ena; 78 u32 sys_alt_rd; 79 u32 sys_alt_wr; 80 u32 sys_xxx[58]; 81 82 /* Registers for the video control */ 83 u32 vid_base; 84 u32 vid_hcnt; 85 u32 vid_htotal; 86 u32 vid_hsync_rise; 87 u32 vid_hblank_rise; 88 u32 vid_hblank_fall; 89 u32 vid_hcnt_preload; 90 u32 vid_vcnt; 91 u32 vid_vlen; 92 u32 vid_vsync_rise; 93 u32 vid_vblank_rise; 94 u32 vid_vblank_fall; 95 u32 vid_vcnt_preload; 96 u32 vid_screenpaint_addr; 97 u32 vid_screenpaint_timectl1; 98 u32 vid_screenpaint_qsfcnt; 99 u32 vid_screenpaint_timectl2; 100 u32 vid_xxx[15]; 101 102 /* Registers for the video control */ 103 u32 vram_base; 104 u32 vram_memcfg; 105 u32 vram_refresh_pd; 106 u32 vram_refresh_cnt; 107 u32 vram_raslo_max; 108 u32 vram_raslo_cur; 109 u32 pwrup_cfg; 110 u32 vram_xxx[25]; 111 112 /* Registers for IBM RGB528 Palette */ 113 u32 ramdac_cmap_wridx; 114 u32 ramdac_palette_data; 115 u32 ramdac_pixel_mask; 116 u32 ramdac_palette_rdaddr; 117 u32 ramdac_idx_lo; 118 u32 ramdac_idx_hi; 119 u32 ramdac_idx_data; 120 u32 ramdac_idx_ctl; 121 u32 ramdac_xxx[1784]; 122 }; 123 124 struct p9100_cmd_parameng { 125 u32 parameng_status; 126 u32 parameng_bltcmd; 127 u32 parameng_quadcmd; 128 }; 129 130 struct p9100_par { 131 spinlock_t lock; 132 struct p9100_regs __iomem *regs; 133 134 u32 flags; 135 #define P9100_FLAG_BLANKED 0x00000001 136 137 unsigned long which_io; 138 }; 139 140 /** 141 * p9100_setcolreg - Optional function. Sets a color register. 142 * @regno: boolean, 0 copy local, 1 get_user() function 143 * @red: frame buffer colormap structure 144 * @green: The green value which can be up to 16 bits wide 145 * @blue: The blue value which can be up to 16 bits wide. 146 * @transp: If supported the alpha value which can be up to 16 bits wide. 147 * @info: frame buffer info structure 148 */ 149 static int p9100_setcolreg(unsigned regno, 150 unsigned red, unsigned green, unsigned blue, 151 unsigned transp, struct fb_info *info) 152 { 153 struct p9100_par *par = (struct p9100_par *) info->par; 154 struct p9100_regs __iomem *regs = par->regs; 155 unsigned long flags; 156 157 if (regno >= 256) 158 return 1; 159 160 red >>= 8; 161 green >>= 8; 162 blue >>= 8; 163 164 spin_lock_irqsave(&par->lock, flags); 165 166 sbus_writel((regno << 16), ®s->ramdac_cmap_wridx); 167 sbus_writel((red << 16), ®s->ramdac_palette_data); 168 sbus_writel((green << 16), ®s->ramdac_palette_data); 169 sbus_writel((blue << 16), ®s->ramdac_palette_data); 170 171 spin_unlock_irqrestore(&par->lock, flags); 172 173 return 0; 174 } 175 176 /** 177 * p9100_blank - Optional function. Blanks the display. 178 * @blank: the blank mode we want. 179 * @info: frame buffer structure that represents a single frame buffer 180 */ 181 static int 182 p9100_blank(int blank, struct fb_info *info) 183 { 184 struct p9100_par *par = (struct p9100_par *) info->par; 185 struct p9100_regs __iomem *regs = par->regs; 186 unsigned long flags; 187 u32 val; 188 189 spin_lock_irqsave(&par->lock, flags); 190 191 switch (blank) { 192 case FB_BLANK_UNBLANK: /* Unblanking */ 193 val = sbus_readl(®s->vid_screenpaint_timectl1); 194 val |= SCREENPAINT_TIMECTL1_ENABLE_VIDEO; 195 sbus_writel(val, ®s->vid_screenpaint_timectl1); 196 par->flags &= ~P9100_FLAG_BLANKED; 197 break; 198 199 case FB_BLANK_NORMAL: /* Normal blanking */ 200 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */ 201 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */ 202 case FB_BLANK_POWERDOWN: /* Poweroff */ 203 val = sbus_readl(®s->vid_screenpaint_timectl1); 204 val &= ~SCREENPAINT_TIMECTL1_ENABLE_VIDEO; 205 sbus_writel(val, ®s->vid_screenpaint_timectl1); 206 par->flags |= P9100_FLAG_BLANKED; 207 break; 208 } 209 210 spin_unlock_irqrestore(&par->lock, flags); 211 212 return 0; 213 } 214 215 static struct sbus_mmap_map p9100_mmap_map[] = { 216 { CG3_MMAP_OFFSET, 0, SBUS_MMAP_FBSIZE(1) }, 217 { 0, 0, 0 } 218 }; 219 220 static int p9100_mmap(struct fb_info *info, struct vm_area_struct *vma) 221 { 222 struct p9100_par *par = (struct p9100_par *)info->par; 223 224 return sbusfb_mmap_helper(p9100_mmap_map, 225 info->fix.smem_start, info->fix.smem_len, 226 par->which_io, vma); 227 } 228 229 static int p9100_ioctl(struct fb_info *info, unsigned int cmd, 230 unsigned long arg) 231 { 232 /* Make it look like a cg3. */ 233 return sbusfb_ioctl_helper(cmd, arg, info, 234 FBTYPE_SUN3COLOR, 8, info->fix.smem_len); 235 } 236 237 /* 238 * Initialisation 239 */ 240 241 static void p9100_init_fix(struct fb_info *info, int linebytes, struct device_node *dp) 242 { 243 snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp); 244 245 info->fix.type = FB_TYPE_PACKED_PIXELS; 246 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 247 248 info->fix.line_length = linebytes; 249 250 info->fix.accel = FB_ACCEL_SUN_CGTHREE; 251 } 252 253 static int p9100_probe(struct platform_device *op) 254 { 255 struct device_node *dp = op->dev.of_node; 256 struct fb_info *info; 257 struct p9100_par *par; 258 int linebytes, err; 259 260 info = framebuffer_alloc(sizeof(struct p9100_par), &op->dev); 261 262 err = -ENOMEM; 263 if (!info) 264 goto out_err; 265 par = info->par; 266 267 spin_lock_init(&par->lock); 268 269 /* This is the framebuffer and the only resource apps can mmap. */ 270 info->fix.smem_start = op->resource[2].start; 271 par->which_io = op->resource[2].flags & IORESOURCE_BITS; 272 273 sbusfb_fill_var(&info->var, dp, 8); 274 info->var.red.length = 8; 275 info->var.green.length = 8; 276 info->var.blue.length = 8; 277 278 linebytes = of_getintprop_default(dp, "linebytes", info->var.xres); 279 info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres); 280 281 par->regs = of_ioremap(&op->resource[0], 0, 282 sizeof(struct p9100_regs), "p9100 regs"); 283 if (!par->regs) 284 goto out_release_fb; 285 286 info->flags = FBINFO_DEFAULT; 287 info->fbops = &p9100_ops; 288 info->screen_base = of_ioremap(&op->resource[2], 0, 289 info->fix.smem_len, "p9100 ram"); 290 if (!info->screen_base) 291 goto out_unmap_regs; 292 293 p9100_blank(FB_BLANK_UNBLANK, info); 294 295 if (fb_alloc_cmap(&info->cmap, 256, 0)) 296 goto out_unmap_screen; 297 298 p9100_init_fix(info, linebytes, dp); 299 300 err = register_framebuffer(info); 301 if (err < 0) 302 goto out_dealloc_cmap; 303 304 fb_set_cmap(&info->cmap, info); 305 306 dev_set_drvdata(&op->dev, info); 307 308 printk(KERN_INFO "%pOF: p9100 at %lx:%lx\n", 309 dp, 310 par->which_io, info->fix.smem_start); 311 312 return 0; 313 314 out_dealloc_cmap: 315 fb_dealloc_cmap(&info->cmap); 316 317 out_unmap_screen: 318 of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len); 319 320 out_unmap_regs: 321 of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs)); 322 323 out_release_fb: 324 framebuffer_release(info); 325 326 out_err: 327 return err; 328 } 329 330 static void p9100_remove(struct platform_device *op) 331 { 332 struct fb_info *info = dev_get_drvdata(&op->dev); 333 struct p9100_par *par = info->par; 334 335 unregister_framebuffer(info); 336 fb_dealloc_cmap(&info->cmap); 337 338 of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs)); 339 of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len); 340 341 framebuffer_release(info); 342 } 343 344 static const struct of_device_id p9100_match[] = { 345 { 346 .name = "p9100", 347 }, 348 {}, 349 }; 350 MODULE_DEVICE_TABLE(of, p9100_match); 351 352 static struct platform_driver p9100_driver = { 353 .driver = { 354 .name = "p9100", 355 .of_match_table = p9100_match, 356 }, 357 .probe = p9100_probe, 358 .remove_new = p9100_remove, 359 }; 360 361 static int __init p9100_init(void) 362 { 363 if (fb_get_options("p9100fb", NULL)) 364 return -ENODEV; 365 366 return platform_driver_register(&p9100_driver); 367 } 368 369 static void __exit p9100_exit(void) 370 { 371 platform_driver_unregister(&p9100_driver); 372 } 373 374 module_init(p9100_init); 375 module_exit(p9100_exit); 376 377 MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets"); 378 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); 379 MODULE_VERSION("2.0"); 380 MODULE_LICENSE("GPL"); 381