1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * WonderMedia WM8505 Frame Buffer device driver 4 * 5 * Copyright (C) 2010 Ed Spiridonov <edo.rus@gmail.com> 6 * Based on vt8500lcdfb.c 7 */ 8 9 #include <linux/delay.h> 10 #include <linux/dma-mapping.h> 11 #include <linux/fb.h> 12 #include <linux/errno.h> 13 #include <linux/err.h> 14 #include <linux/init.h> 15 #include <linux/interrupt.h> 16 #include <linux/io.h> 17 #include <linux/kernel.h> 18 #include <linux/memblock.h> 19 #include <linux/mm.h> 20 #include <linux/module.h> 21 #include <linux/of.h> 22 #include <linux/of_fdt.h> 23 #include <linux/platform_device.h> 24 #include <linux/slab.h> 25 #include <linux/string.h> 26 #include <linux/wait.h> 27 #include <video/of_display_timing.h> 28 29 #include "wm8505fb_regs.h" 30 #include "wmt_ge_rops.h" 31 32 #define DRIVER_NAME "wm8505-fb" 33 34 #define to_wm8505fb_info(__info) container_of(__info, \ 35 struct wm8505fb_info, fb) 36 struct wm8505fb_info { 37 struct fb_info fb; 38 void __iomem *regbase; 39 unsigned int contrast; 40 }; 41 42 43 static int wm8505fb_init_hw(struct fb_info *info) 44 { 45 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 46 47 int i; 48 49 /* I know the purpose only of few registers, so clear unknown */ 50 for (i = 0; i < 0x200; i += 4) 51 writel(0, fbi->regbase + i); 52 53 /* Set frame buffer address */ 54 writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR); 55 writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1); 56 57 /* 58 * Set in-memory picture format to RGB 59 * 0x31C sets the correct color mode (RGB565) for WM8650 60 * Bit 8+9 (0x300) are ignored on WM8505 as reserved 61 */ 62 writel(0x31c, fbi->regbase + WMT_GOVR_COLORSPACE); 63 writel(1, fbi->regbase + WMT_GOVR_COLORSPACE1); 64 65 /* Virtual buffer size */ 66 writel(info->var.xres, fbi->regbase + WMT_GOVR_XRES); 67 writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL); 68 69 /* black magic ;) */ 70 writel(0xf, fbi->regbase + WMT_GOVR_FHI); 71 writel(4, fbi->regbase + WMT_GOVR_DVO_SET); 72 writel(1, fbi->regbase + WMT_GOVR_MIF_ENABLE); 73 writel(1, fbi->regbase + WMT_GOVR_REG_UPDATE); 74 75 return 0; 76 } 77 78 static int wm8505fb_set_timing(struct fb_info *info) 79 { 80 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 81 82 int h_start = info->var.left_margin; 83 int h_end = h_start + info->var.xres; 84 int h_all = h_end + info->var.right_margin; 85 int h_sync = info->var.hsync_len; 86 87 int v_start = info->var.upper_margin; 88 int v_end = v_start + info->var.yres; 89 int v_all = v_end + info->var.lower_margin; 90 int v_sync = info->var.vsync_len; 91 92 writel(0, fbi->regbase + WMT_GOVR_TG); 93 94 writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START); 95 writel(h_end, fbi->regbase + WMT_GOVR_TIMING_H_END); 96 writel(h_all, fbi->regbase + WMT_GOVR_TIMING_H_ALL); 97 writel(h_sync, fbi->regbase + WMT_GOVR_TIMING_H_SYNC); 98 99 writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START); 100 writel(v_end, fbi->regbase + WMT_GOVR_TIMING_V_END); 101 writel(v_all, fbi->regbase + WMT_GOVR_TIMING_V_ALL); 102 writel(v_sync, fbi->regbase + WMT_GOVR_TIMING_V_SYNC); 103 104 writel(1, fbi->regbase + WMT_GOVR_TG); 105 106 return 0; 107 } 108 109 110 static int wm8505fb_set_par(struct fb_info *info) 111 { 112 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 113 114 if (!fbi) 115 return -EINVAL; 116 117 if (info->var.bits_per_pixel == 32) { 118 info->var.red.offset = 16; 119 info->var.red.length = 8; 120 info->var.red.msb_right = 0; 121 info->var.green.offset = 8; 122 info->var.green.length = 8; 123 info->var.green.msb_right = 0; 124 info->var.blue.offset = 0; 125 info->var.blue.length = 8; 126 info->var.blue.msb_right = 0; 127 info->fix.visual = FB_VISUAL_TRUECOLOR; 128 info->fix.line_length = info->var.xres_virtual << 2; 129 } else if (info->var.bits_per_pixel == 16) { 130 info->var.red.offset = 11; 131 info->var.red.length = 5; 132 info->var.red.msb_right = 0; 133 info->var.green.offset = 5; 134 info->var.green.length = 6; 135 info->var.green.msb_right = 0; 136 info->var.blue.offset = 0; 137 info->var.blue.length = 5; 138 info->var.blue.msb_right = 0; 139 info->fix.visual = FB_VISUAL_TRUECOLOR; 140 info->fix.line_length = info->var.xres_virtual << 1; 141 } 142 143 wm8505fb_set_timing(info); 144 145 writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast, 146 fbi->regbase + WMT_GOVR_CONTRAST); 147 148 return 0; 149 } 150 151 static ssize_t contrast_show(struct device *dev, 152 struct device_attribute *attr, char *buf) 153 { 154 struct fb_info *info = dev_get_drvdata(dev); 155 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 156 157 return sprintf(buf, "%u\n", fbi->contrast); 158 } 159 160 static ssize_t contrast_store(struct device *dev, 161 struct device_attribute *attr, 162 const char *buf, size_t count) 163 { 164 struct fb_info *info = dev_get_drvdata(dev); 165 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 166 unsigned long tmp; 167 168 if (kstrtoul(buf, 10, &tmp) || (tmp > 0xff)) 169 return -EINVAL; 170 fbi->contrast = tmp; 171 172 wm8505fb_set_par(info); 173 174 return count; 175 } 176 177 static DEVICE_ATTR_RW(contrast); 178 179 static struct attribute *wm8505fb_attrs[] = { 180 &dev_attr_contrast.attr, 181 NULL, 182 }; 183 ATTRIBUTE_GROUPS(wm8505fb); 184 185 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) 186 { 187 chan &= 0xffff; 188 chan >>= 16 - bf->length; 189 return chan << bf->offset; 190 } 191 192 static int wm8505fb_setcolreg(unsigned regno, unsigned red, unsigned green, 193 unsigned blue, unsigned transp, 194 struct fb_info *info) { 195 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 196 int ret = 1; 197 unsigned int val; 198 if (regno >= 256) 199 return -EINVAL; 200 201 if (info->var.grayscale) 202 red = green = blue = 203 (19595 * red + 38470 * green + 7471 * blue) >> 16; 204 205 switch (fbi->fb.fix.visual) { 206 case FB_VISUAL_TRUECOLOR: 207 if (regno < 16) { 208 u32 *pal = info->pseudo_palette; 209 210 val = chan_to_field(red, &fbi->fb.var.red); 211 val |= chan_to_field(green, &fbi->fb.var.green); 212 val |= chan_to_field(blue, &fbi->fb.var.blue); 213 214 pal[regno] = val; 215 ret = 0; 216 } 217 break; 218 } 219 220 return ret; 221 } 222 223 static int wm8505fb_pan_display(struct fb_var_screeninfo *var, 224 struct fb_info *info) 225 { 226 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 227 228 writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN); 229 writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN); 230 return 0; 231 } 232 233 static int wm8505fb_blank(int blank, struct fb_info *info) 234 { 235 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 236 237 switch (blank) { 238 case FB_BLANK_UNBLANK: 239 wm8505fb_set_timing(info); 240 break; 241 default: 242 writel(0, fbi->regbase + WMT_GOVR_TIMING_V_SYNC); 243 break; 244 } 245 246 return 0; 247 } 248 249 static const struct fb_ops wm8505fb_ops = { 250 .owner = THIS_MODULE, 251 .fb_set_par = wm8505fb_set_par, 252 .fb_setcolreg = wm8505fb_setcolreg, 253 .fb_fillrect = wmt_ge_fillrect, 254 .fb_copyarea = wmt_ge_copyarea, 255 .fb_imageblit = sys_imageblit, 256 .fb_sync = wmt_ge_sync, 257 .fb_pan_display = wm8505fb_pan_display, 258 .fb_blank = wm8505fb_blank, 259 }; 260 261 static int wm8505fb_probe(struct platform_device *pdev) 262 { 263 struct wm8505fb_info *fbi; 264 struct display_timings *disp_timing; 265 void *addr; 266 int ret; 267 268 struct fb_videomode mode; 269 u32 bpp; 270 dma_addr_t fb_mem_phys; 271 unsigned long fb_mem_len; 272 void *fb_mem_virt; 273 274 fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) + 275 sizeof(u32) * 16, GFP_KERNEL); 276 if (!fbi) 277 return -ENOMEM; 278 279 strcpy(fbi->fb.fix.id, DRIVER_NAME); 280 281 fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS; 282 fbi->fb.fix.xpanstep = 1; 283 fbi->fb.fix.ypanstep = 1; 284 fbi->fb.fix.ywrapstep = 0; 285 fbi->fb.fix.accel = FB_ACCEL_NONE; 286 287 fbi->fb.fbops = &wm8505fb_ops; 288 fbi->fb.flags = FBINFO_DEFAULT 289 | FBINFO_HWACCEL_COPYAREA 290 | FBINFO_HWACCEL_FILLRECT 291 | FBINFO_HWACCEL_XPAN 292 | FBINFO_HWACCEL_YPAN 293 | FBINFO_VIRTFB 294 | FBINFO_PARTIAL_PAN_OK; 295 fbi->fb.node = -1; 296 297 addr = fbi; 298 addr = addr + sizeof(struct wm8505fb_info); 299 fbi->fb.pseudo_palette = addr; 300 301 fbi->regbase = devm_platform_ioremap_resource(pdev, 0); 302 if (IS_ERR(fbi->regbase)) 303 return PTR_ERR(fbi->regbase); 304 305 disp_timing = of_get_display_timings(pdev->dev.of_node); 306 if (!disp_timing) 307 return -EINVAL; 308 309 ret = of_get_fb_videomode(pdev->dev.of_node, &mode, OF_USE_NATIVE_MODE); 310 if (ret) 311 return ret; 312 313 ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp); 314 if (ret) 315 return ret; 316 317 fb_videomode_to_var(&fbi->fb.var, &mode); 318 319 fbi->fb.var.nonstd = 0; 320 fbi->fb.var.activate = FB_ACTIVATE_NOW; 321 322 fbi->fb.var.height = -1; 323 fbi->fb.var.width = -1; 324 325 /* try allocating the framebuffer */ 326 fb_mem_len = mode.xres * mode.yres * 2 * (bpp / 8); 327 fb_mem_virt = dmam_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys, 328 GFP_KERNEL); 329 if (!fb_mem_virt) { 330 pr_err("%s: Failed to allocate framebuffer\n", __func__); 331 return -ENOMEM; 332 } 333 334 fbi->fb.var.xres_virtual = mode.xres; 335 fbi->fb.var.yres_virtual = mode.yres * 2; 336 fbi->fb.var.bits_per_pixel = bpp; 337 338 fbi->fb.fix.smem_start = fb_mem_phys; 339 fbi->fb.fix.smem_len = fb_mem_len; 340 fbi->fb.screen_buffer = fb_mem_virt; 341 fbi->fb.screen_size = fb_mem_len; 342 343 fbi->contrast = 0x10; 344 ret = wm8505fb_set_par(&fbi->fb); 345 if (ret) { 346 dev_err(&pdev->dev, "Failed to set parameters\n"); 347 return ret; 348 } 349 350 if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) { 351 dev_err(&pdev->dev, "Failed to allocate color map\n"); 352 return -ENOMEM; 353 } 354 355 wm8505fb_init_hw(&fbi->fb); 356 357 platform_set_drvdata(pdev, fbi); 358 359 ret = register_framebuffer(&fbi->fb); 360 if (ret < 0) { 361 dev_err(&pdev->dev, 362 "Failed to register framebuffer device: %d\n", ret); 363 if (fbi->fb.cmap.len) 364 fb_dealloc_cmap(&fbi->fb.cmap); 365 return ret; 366 } 367 368 fb_info(&fbi->fb, "%s frame buffer at 0x%lx-0x%lx\n", 369 fbi->fb.fix.id, fbi->fb.fix.smem_start, 370 fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1); 371 372 return 0; 373 } 374 375 static int wm8505fb_remove(struct platform_device *pdev) 376 { 377 struct wm8505fb_info *fbi = platform_get_drvdata(pdev); 378 379 unregister_framebuffer(&fbi->fb); 380 381 writel(0, fbi->regbase); 382 383 if (fbi->fb.cmap.len) 384 fb_dealloc_cmap(&fbi->fb.cmap); 385 386 return 0; 387 } 388 389 static const struct of_device_id wmt_dt_ids[] = { 390 { .compatible = "wm,wm8505-fb", }, 391 {} 392 }; 393 394 static struct platform_driver wm8505fb_driver = { 395 .probe = wm8505fb_probe, 396 .remove = wm8505fb_remove, 397 .driver = { 398 .name = DRIVER_NAME, 399 .of_match_table = wmt_dt_ids, 400 .dev_groups = wm8505fb_groups, 401 }, 402 }; 403 404 module_platform_driver(wm8505fb_driver); 405 406 MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>"); 407 MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505"); 408 MODULE_LICENSE("GPL v2"); 409 MODULE_DEVICE_TABLE(of, wmt_dt_ids); 410