1 /* 2 * WonderMedia WM8505 Frame Buffer device driver 3 * 4 * Copyright (C) 2010 Ed Spiridonov <edo.rus@gmail.com> 5 * Based on vt8500lcdfb.c 6 * 7 * This software is licensed under the terms of the GNU General Public 8 * License version 2, as published by the Free Software Foundation, and 9 * may be copied, distributed, and modified under those terms. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17 #include <linux/delay.h> 18 #include <linux/dma-mapping.h> 19 #include <linux/fb.h> 20 #include <linux/errno.h> 21 #include <linux/err.h> 22 #include <linux/init.h> 23 #include <linux/interrupt.h> 24 #include <linux/io.h> 25 #include <linux/kernel.h> 26 #include <linux/memblock.h> 27 #include <linux/mm.h> 28 #include <linux/module.h> 29 #include <linux/of.h> 30 #include <linux/of_fdt.h> 31 #include <linux/platform_device.h> 32 #include <linux/slab.h> 33 #include <linux/string.h> 34 #include <linux/wait.h> 35 #include <video/of_display_timing.h> 36 37 #include "wm8505fb_regs.h" 38 #include "wmt_ge_rops.h" 39 40 #define DRIVER_NAME "wm8505-fb" 41 42 #define to_wm8505fb_info(__info) container_of(__info, \ 43 struct wm8505fb_info, fb) 44 struct wm8505fb_info { 45 struct fb_info fb; 46 void __iomem *regbase; 47 unsigned int contrast; 48 }; 49 50 51 static int wm8505fb_init_hw(struct fb_info *info) 52 { 53 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 54 55 int i; 56 57 /* I know the purpose only of few registers, so clear unknown */ 58 for (i = 0; i < 0x200; i += 4) 59 writel(0, fbi->regbase + i); 60 61 /* Set frame buffer address */ 62 writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR); 63 writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1); 64 65 /* 66 * Set in-memory picture format to RGB 67 * 0x31C sets the correct color mode (RGB565) for WM8650 68 * Bit 8+9 (0x300) are ignored on WM8505 as reserved 69 */ 70 writel(0x31c, fbi->regbase + WMT_GOVR_COLORSPACE); 71 writel(1, fbi->regbase + WMT_GOVR_COLORSPACE1); 72 73 /* Virtual buffer size */ 74 writel(info->var.xres, fbi->regbase + WMT_GOVR_XRES); 75 writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL); 76 77 /* black magic ;) */ 78 writel(0xf, fbi->regbase + WMT_GOVR_FHI); 79 writel(4, fbi->regbase + WMT_GOVR_DVO_SET); 80 writel(1, fbi->regbase + WMT_GOVR_MIF_ENABLE); 81 writel(1, fbi->regbase + WMT_GOVR_REG_UPDATE); 82 83 return 0; 84 } 85 86 static int wm8505fb_set_timing(struct fb_info *info) 87 { 88 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 89 90 int h_start = info->var.left_margin; 91 int h_end = h_start + info->var.xres; 92 int h_all = h_end + info->var.right_margin; 93 int h_sync = info->var.hsync_len; 94 95 int v_start = info->var.upper_margin; 96 int v_end = v_start + info->var.yres; 97 int v_all = v_end + info->var.lower_margin; 98 int v_sync = info->var.vsync_len; 99 100 writel(0, fbi->regbase + WMT_GOVR_TG); 101 102 writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START); 103 writel(h_end, fbi->regbase + WMT_GOVR_TIMING_H_END); 104 writel(h_all, fbi->regbase + WMT_GOVR_TIMING_H_ALL); 105 writel(h_sync, fbi->regbase + WMT_GOVR_TIMING_H_SYNC); 106 107 writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START); 108 writel(v_end, fbi->regbase + WMT_GOVR_TIMING_V_END); 109 writel(v_all, fbi->regbase + WMT_GOVR_TIMING_V_ALL); 110 writel(v_sync, fbi->regbase + WMT_GOVR_TIMING_V_SYNC); 111 112 writel(1, fbi->regbase + WMT_GOVR_TG); 113 114 return 0; 115 } 116 117 118 static int wm8505fb_set_par(struct fb_info *info) 119 { 120 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 121 122 if (!fbi) 123 return -EINVAL; 124 125 if (info->var.bits_per_pixel == 32) { 126 info->var.red.offset = 16; 127 info->var.red.length = 8; 128 info->var.red.msb_right = 0; 129 info->var.green.offset = 8; 130 info->var.green.length = 8; 131 info->var.green.msb_right = 0; 132 info->var.blue.offset = 0; 133 info->var.blue.length = 8; 134 info->var.blue.msb_right = 0; 135 info->fix.visual = FB_VISUAL_TRUECOLOR; 136 info->fix.line_length = info->var.xres_virtual << 2; 137 } else if (info->var.bits_per_pixel == 16) { 138 info->var.red.offset = 11; 139 info->var.red.length = 5; 140 info->var.red.msb_right = 0; 141 info->var.green.offset = 5; 142 info->var.green.length = 6; 143 info->var.green.msb_right = 0; 144 info->var.blue.offset = 0; 145 info->var.blue.length = 5; 146 info->var.blue.msb_right = 0; 147 info->fix.visual = FB_VISUAL_TRUECOLOR; 148 info->fix.line_length = info->var.xres_virtual << 1; 149 } 150 151 wm8505fb_set_timing(info); 152 153 writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast, 154 fbi->regbase + WMT_GOVR_CONTRAST); 155 156 return 0; 157 } 158 159 static ssize_t contrast_show(struct device *dev, 160 struct device_attribute *attr, char *buf) 161 { 162 struct fb_info *info = dev_get_drvdata(dev); 163 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 164 165 return sprintf(buf, "%u\n", fbi->contrast); 166 } 167 168 static ssize_t contrast_store(struct device *dev, 169 struct device_attribute *attr, 170 const char *buf, size_t count) 171 { 172 struct fb_info *info = dev_get_drvdata(dev); 173 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 174 unsigned long tmp; 175 176 if (kstrtoul(buf, 10, &tmp) || (tmp > 0xff)) 177 return -EINVAL; 178 fbi->contrast = tmp; 179 180 wm8505fb_set_par(info); 181 182 return count; 183 } 184 185 static DEVICE_ATTR_RW(contrast); 186 187 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) 188 { 189 chan &= 0xffff; 190 chan >>= 16 - bf->length; 191 return chan << bf->offset; 192 } 193 194 static int wm8505fb_setcolreg(unsigned regno, unsigned red, unsigned green, 195 unsigned blue, unsigned transp, 196 struct fb_info *info) { 197 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 198 int ret = 1; 199 unsigned int val; 200 if (regno >= 256) 201 return -EINVAL; 202 203 if (info->var.grayscale) 204 red = green = blue = 205 (19595 * red + 38470 * green + 7471 * blue) >> 16; 206 207 switch (fbi->fb.fix.visual) { 208 case FB_VISUAL_TRUECOLOR: 209 if (regno < 16) { 210 u32 *pal = info->pseudo_palette; 211 212 val = chan_to_field(red, &fbi->fb.var.red); 213 val |= chan_to_field(green, &fbi->fb.var.green); 214 val |= chan_to_field(blue, &fbi->fb.var.blue); 215 216 pal[regno] = val; 217 ret = 0; 218 } 219 break; 220 } 221 222 return ret; 223 } 224 225 static int wm8505fb_pan_display(struct fb_var_screeninfo *var, 226 struct fb_info *info) 227 { 228 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 229 230 writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN); 231 writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN); 232 return 0; 233 } 234 235 static int wm8505fb_blank(int blank, struct fb_info *info) 236 { 237 struct wm8505fb_info *fbi = to_wm8505fb_info(info); 238 239 switch (blank) { 240 case FB_BLANK_UNBLANK: 241 wm8505fb_set_timing(info); 242 break; 243 default: 244 writel(0, fbi->regbase + WMT_GOVR_TIMING_V_SYNC); 245 break; 246 } 247 248 return 0; 249 } 250 251 static struct fb_ops wm8505fb_ops = { 252 .owner = THIS_MODULE, 253 .fb_set_par = wm8505fb_set_par, 254 .fb_setcolreg = wm8505fb_setcolreg, 255 .fb_fillrect = wmt_ge_fillrect, 256 .fb_copyarea = wmt_ge_copyarea, 257 .fb_imageblit = sys_imageblit, 258 .fb_sync = wmt_ge_sync, 259 .fb_pan_display = wm8505fb_pan_display, 260 .fb_blank = wm8505fb_blank, 261 }; 262 263 static int wm8505fb_probe(struct platform_device *pdev) 264 { 265 struct wm8505fb_info *fbi; 266 struct resource *res; 267 struct display_timings *disp_timing; 268 void *addr; 269 int ret; 270 271 struct fb_videomode mode; 272 u32 bpp; 273 dma_addr_t fb_mem_phys; 274 unsigned long fb_mem_len; 275 void *fb_mem_virt; 276 277 fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) + 278 sizeof(u32) * 16, GFP_KERNEL); 279 if (!fbi) 280 return -ENOMEM; 281 282 strcpy(fbi->fb.fix.id, DRIVER_NAME); 283 284 fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS; 285 fbi->fb.fix.xpanstep = 1; 286 fbi->fb.fix.ypanstep = 1; 287 fbi->fb.fix.ywrapstep = 0; 288 fbi->fb.fix.accel = FB_ACCEL_NONE; 289 290 fbi->fb.fbops = &wm8505fb_ops; 291 fbi->fb.flags = FBINFO_DEFAULT 292 | FBINFO_HWACCEL_COPYAREA 293 | FBINFO_HWACCEL_FILLRECT 294 | FBINFO_HWACCEL_XPAN 295 | FBINFO_HWACCEL_YPAN 296 | FBINFO_VIRTFB 297 | FBINFO_PARTIAL_PAN_OK; 298 fbi->fb.node = -1; 299 300 addr = fbi; 301 addr = addr + sizeof(struct wm8505fb_info); 302 fbi->fb.pseudo_palette = addr; 303 304 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 305 fbi->regbase = devm_ioremap_resource(&pdev->dev, res); 306 if (IS_ERR(fbi->regbase)) 307 return PTR_ERR(fbi->regbase); 308 309 disp_timing = of_get_display_timings(pdev->dev.of_node); 310 if (!disp_timing) 311 return -EINVAL; 312 313 ret = of_get_fb_videomode(pdev->dev.of_node, &mode, OF_USE_NATIVE_MODE); 314 if (ret) 315 return ret; 316 317 ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp); 318 if (ret) 319 return ret; 320 321 fb_videomode_to_var(&fbi->fb.var, &mode); 322 323 fbi->fb.var.nonstd = 0; 324 fbi->fb.var.activate = FB_ACTIVATE_NOW; 325 326 fbi->fb.var.height = -1; 327 fbi->fb.var.width = -1; 328 329 /* try allocating the framebuffer */ 330 fb_mem_len = mode.xres * mode.yres * 2 * (bpp / 8); 331 fb_mem_virt = dmam_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys, 332 GFP_KERNEL); 333 if (!fb_mem_virt) { 334 pr_err("%s: Failed to allocate framebuffer\n", __func__); 335 return -ENOMEM; 336 } 337 338 fbi->fb.var.xres_virtual = mode.xres; 339 fbi->fb.var.yres_virtual = mode.yres * 2; 340 fbi->fb.var.bits_per_pixel = bpp; 341 342 fbi->fb.fix.smem_start = fb_mem_phys; 343 fbi->fb.fix.smem_len = fb_mem_len; 344 fbi->fb.screen_base = fb_mem_virt; 345 fbi->fb.screen_size = fb_mem_len; 346 347 fbi->contrast = 0x10; 348 ret = wm8505fb_set_par(&fbi->fb); 349 if (ret) { 350 dev_err(&pdev->dev, "Failed to set parameters\n"); 351 return ret; 352 } 353 354 if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) { 355 dev_err(&pdev->dev, "Failed to allocate color map\n"); 356 return -ENOMEM; 357 } 358 359 wm8505fb_init_hw(&fbi->fb); 360 361 platform_set_drvdata(pdev, fbi); 362 363 ret = register_framebuffer(&fbi->fb); 364 if (ret < 0) { 365 dev_err(&pdev->dev, 366 "Failed to register framebuffer device: %d\n", ret); 367 if (fbi->fb.cmap.len) 368 fb_dealloc_cmap(&fbi->fb.cmap); 369 return ret; 370 } 371 372 ret = device_create_file(&pdev->dev, &dev_attr_contrast); 373 if (ret < 0) 374 fb_warn(&fbi->fb, "failed to register attributes (%d)\n", ret); 375 376 fb_info(&fbi->fb, "%s frame buffer at 0x%lx-0x%lx\n", 377 fbi->fb.fix.id, fbi->fb.fix.smem_start, 378 fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1); 379 380 return 0; 381 } 382 383 static int wm8505fb_remove(struct platform_device *pdev) 384 { 385 struct wm8505fb_info *fbi = platform_get_drvdata(pdev); 386 387 device_remove_file(&pdev->dev, &dev_attr_contrast); 388 389 unregister_framebuffer(&fbi->fb); 390 391 writel(0, fbi->regbase); 392 393 if (fbi->fb.cmap.len) 394 fb_dealloc_cmap(&fbi->fb.cmap); 395 396 return 0; 397 } 398 399 static const struct of_device_id wmt_dt_ids[] = { 400 { .compatible = "wm,wm8505-fb", }, 401 {} 402 }; 403 404 static struct platform_driver wm8505fb_driver = { 405 .probe = wm8505fb_probe, 406 .remove = wm8505fb_remove, 407 .driver = { 408 .name = DRIVER_NAME, 409 .of_match_table = wmt_dt_ids, 410 }, 411 }; 412 413 module_platform_driver(wm8505fb_driver); 414 415 MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>"); 416 MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505"); 417 MODULE_LICENSE("GPL v2"); 418 MODULE_DEVICE_TABLE(of, wmt_dt_ids); 419