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_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma); 34 static int p9100_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 p9100_ops = { 41 .owner = THIS_MODULE, 42 FB_DEFAULT_SBUS_OPS(p9100), 43 .fb_setcolreg = p9100_setcolreg, 44 .fb_blank = p9100_blank, 45 }; 46 47 /* P9100 control registers */ 48 #define P9100_SYSCTL_OFF 0x0UL 49 #define P9100_VIDEOCTL_OFF 0x100UL 50 #define P9100_VRAMCTL_OFF 0x180UL 51 #define P9100_RAMDAC_OFF 0x200UL 52 #define P9100_VIDEOCOPROC_OFF 0x400UL 53 54 /* P9100 command registers */ 55 #define P9100_CMD_OFF 0x0UL 56 57 /* P9100 framebuffer memory */ 58 #define P9100_FB_OFF 0x0UL 59 60 /* 3 bits: 2=8bpp 3=16bpp 5=32bpp 7=24bpp */ 61 #define SYS_CONFIG_PIXELSIZE_SHIFT 26 62 63 #define SCREENPAINT_TIMECTL1_ENABLE_VIDEO 0x20 /* 0 = off, 1 = on */ 64 65 struct p9100_regs { 66 /* Registers for the system control */ 67 u32 sys_base; 68 u32 sys_config; 69 u32 sys_intr; 70 u32 sys_int_ena; 71 u32 sys_alt_rd; 72 u32 sys_alt_wr; 73 u32 sys_xxx[58]; 74 75 /* Registers for the video control */ 76 u32 vid_base; 77 u32 vid_hcnt; 78 u32 vid_htotal; 79 u32 vid_hsync_rise; 80 u32 vid_hblank_rise; 81 u32 vid_hblank_fall; 82 u32 vid_hcnt_preload; 83 u32 vid_vcnt; 84 u32 vid_vlen; 85 u32 vid_vsync_rise; 86 u32 vid_vblank_rise; 87 u32 vid_vblank_fall; 88 u32 vid_vcnt_preload; 89 u32 vid_screenpaint_addr; 90 u32 vid_screenpaint_timectl1; 91 u32 vid_screenpaint_qsfcnt; 92 u32 vid_screenpaint_timectl2; 93 u32 vid_xxx[15]; 94 95 /* Registers for the video control */ 96 u32 vram_base; 97 u32 vram_memcfg; 98 u32 vram_refresh_pd; 99 u32 vram_refresh_cnt; 100 u32 vram_raslo_max; 101 u32 vram_raslo_cur; 102 u32 pwrup_cfg; 103 u32 vram_xxx[25]; 104 105 /* Registers for IBM RGB528 Palette */ 106 u32 ramdac_cmap_wridx; 107 u32 ramdac_palette_data; 108 u32 ramdac_pixel_mask; 109 u32 ramdac_palette_rdaddr; 110 u32 ramdac_idx_lo; 111 u32 ramdac_idx_hi; 112 u32 ramdac_idx_data; 113 u32 ramdac_idx_ctl; 114 u32 ramdac_xxx[1784]; 115 }; 116 117 struct p9100_cmd_parameng { 118 u32 parameng_status; 119 u32 parameng_bltcmd; 120 u32 parameng_quadcmd; 121 }; 122 123 struct p9100_par { 124 spinlock_t lock; 125 struct p9100_regs __iomem *regs; 126 127 u32 flags; 128 #define P9100_FLAG_BLANKED 0x00000001 129 130 unsigned long which_io; 131 }; 132 133 /** 134 * p9100_setcolreg - Optional function. Sets a color register. 135 * @regno: boolean, 0 copy local, 1 get_user() function 136 * @red: frame buffer colormap structure 137 * @green: The green value which can be up to 16 bits wide 138 * @blue: The blue value which can be up to 16 bits wide. 139 * @transp: If supported the alpha value which can be up to 16 bits wide. 140 * @info: frame buffer info structure 141 */ 142 static int p9100_setcolreg(unsigned regno, 143 unsigned red, unsigned green, unsigned blue, 144 unsigned transp, struct fb_info *info) 145 { 146 struct p9100_par *par = (struct p9100_par *) info->par; 147 struct p9100_regs __iomem *regs = par->regs; 148 unsigned long flags; 149 150 if (regno >= 256) 151 return 1; 152 153 red >>= 8; 154 green >>= 8; 155 blue >>= 8; 156 157 spin_lock_irqsave(&par->lock, flags); 158 159 sbus_writel((regno << 16), ®s->ramdac_cmap_wridx); 160 sbus_writel((red << 16), ®s->ramdac_palette_data); 161 sbus_writel((green << 16), ®s->ramdac_palette_data); 162 sbus_writel((blue << 16), ®s->ramdac_palette_data); 163 164 spin_unlock_irqrestore(&par->lock, flags); 165 166 return 0; 167 } 168 169 /** 170 * p9100_blank - Optional function. Blanks the display. 171 * @blank: the blank mode we want. 172 * @info: frame buffer structure that represents a single frame buffer 173 */ 174 static int 175 p9100_blank(int blank, struct fb_info *info) 176 { 177 struct p9100_par *par = (struct p9100_par *) info->par; 178 struct p9100_regs __iomem *regs = par->regs; 179 unsigned long flags; 180 u32 val; 181 182 spin_lock_irqsave(&par->lock, flags); 183 184 switch (blank) { 185 case FB_BLANK_UNBLANK: /* Unblanking */ 186 val = sbus_readl(®s->vid_screenpaint_timectl1); 187 val |= SCREENPAINT_TIMECTL1_ENABLE_VIDEO; 188 sbus_writel(val, ®s->vid_screenpaint_timectl1); 189 par->flags &= ~P9100_FLAG_BLANKED; 190 break; 191 192 case FB_BLANK_NORMAL: /* Normal blanking */ 193 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */ 194 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */ 195 case FB_BLANK_POWERDOWN: /* Poweroff */ 196 val = sbus_readl(®s->vid_screenpaint_timectl1); 197 val &= ~SCREENPAINT_TIMECTL1_ENABLE_VIDEO; 198 sbus_writel(val, ®s->vid_screenpaint_timectl1); 199 par->flags |= P9100_FLAG_BLANKED; 200 break; 201 } 202 203 spin_unlock_irqrestore(&par->lock, flags); 204 205 return 0; 206 } 207 208 static struct sbus_mmap_map p9100_mmap_map[] = { 209 { CG3_MMAP_OFFSET, 0, SBUS_MMAP_FBSIZE(1) }, 210 { 0, 0, 0 } 211 }; 212 213 static int p9100_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma) 214 { 215 struct p9100_par *par = (struct p9100_par *)info->par; 216 217 return sbusfb_mmap_helper(p9100_mmap_map, 218 info->fix.smem_start, info->fix.smem_len, 219 par->which_io, vma); 220 } 221 222 static int p9100_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) 223 { 224 /* Make it look like a cg3. */ 225 return sbusfb_ioctl_helper(cmd, arg, info, 226 FBTYPE_SUN3COLOR, 8, info->fix.smem_len); 227 } 228 229 /* 230 * Initialisation 231 */ 232 233 static void p9100_init_fix(struct fb_info *info, int linebytes, struct device_node *dp) 234 { 235 snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp); 236 237 info->fix.type = FB_TYPE_PACKED_PIXELS; 238 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 239 240 info->fix.line_length = linebytes; 241 242 info->fix.accel = FB_ACCEL_SUN_CGTHREE; 243 } 244 245 static int p9100_probe(struct platform_device *op) 246 { 247 struct device_node *dp = op->dev.of_node; 248 struct fb_info *info; 249 struct p9100_par *par; 250 int linebytes, err; 251 252 info = framebuffer_alloc(sizeof(struct p9100_par), &op->dev); 253 254 err = -ENOMEM; 255 if (!info) 256 goto out_err; 257 par = info->par; 258 259 spin_lock_init(&par->lock); 260 261 /* This is the framebuffer and the only resource apps can mmap. */ 262 info->fix.smem_start = op->resource[2].start; 263 par->which_io = op->resource[2].flags & IORESOURCE_BITS; 264 265 sbusfb_fill_var(&info->var, dp, 8); 266 info->var.red.length = 8; 267 info->var.green.length = 8; 268 info->var.blue.length = 8; 269 270 linebytes = of_getintprop_default(dp, "linebytes", info->var.xres); 271 info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres); 272 273 par->regs = of_ioremap(&op->resource[0], 0, 274 sizeof(struct p9100_regs), "p9100 regs"); 275 if (!par->regs) 276 goto out_release_fb; 277 278 info->fbops = &p9100_ops; 279 info->screen_base = of_ioremap(&op->resource[2], 0, 280 info->fix.smem_len, "p9100 ram"); 281 if (!info->screen_base) 282 goto out_unmap_regs; 283 284 p9100_blank(FB_BLANK_UNBLANK, info); 285 286 if (fb_alloc_cmap(&info->cmap, 256, 0)) 287 goto out_unmap_screen; 288 289 p9100_init_fix(info, linebytes, dp); 290 291 err = register_framebuffer(info); 292 if (err < 0) 293 goto out_dealloc_cmap; 294 295 fb_set_cmap(&info->cmap, info); 296 297 dev_set_drvdata(&op->dev, info); 298 299 printk(KERN_INFO "%pOF: p9100 at %lx:%lx\n", 300 dp, 301 par->which_io, info->fix.smem_start); 302 303 return 0; 304 305 out_dealloc_cmap: 306 fb_dealloc_cmap(&info->cmap); 307 308 out_unmap_screen: 309 of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len); 310 311 out_unmap_regs: 312 of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs)); 313 314 out_release_fb: 315 framebuffer_release(info); 316 317 out_err: 318 return err; 319 } 320 321 static void p9100_remove(struct platform_device *op) 322 { 323 struct fb_info *info = dev_get_drvdata(&op->dev); 324 struct p9100_par *par = info->par; 325 326 unregister_framebuffer(info); 327 fb_dealloc_cmap(&info->cmap); 328 329 of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs)); 330 of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len); 331 332 framebuffer_release(info); 333 } 334 335 static const struct of_device_id p9100_match[] = { 336 { 337 .name = "p9100", 338 }, 339 {}, 340 }; 341 MODULE_DEVICE_TABLE(of, p9100_match); 342 343 static struct platform_driver p9100_driver = { 344 .driver = { 345 .name = "p9100", 346 .of_match_table = p9100_match, 347 }, 348 .probe = p9100_probe, 349 .remove_new = p9100_remove, 350 }; 351 352 static int __init p9100_init(void) 353 { 354 if (fb_get_options("p9100fb", NULL)) 355 return -ENODEV; 356 357 return platform_driver_register(&p9100_driver); 358 } 359 360 static void __exit p9100_exit(void) 361 { 362 platform_driver_unregister(&p9100_driver); 363 } 364 365 module_init(p9100_init); 366 module_exit(p9100_exit); 367 368 MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets"); 369 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); 370 MODULE_VERSION("2.0"); 371 MODULE_LICENSE("GPL"); 372