drivers/video/wm8505fb.c

   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/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/errno.h>
  20 #include <linux/string.h>
  21 #include <linux/mm.h>
  22 #include <linux/slab.h>
  23 #include <linux/delay.h>
  24 #include <linux/fb.h>
  25 #include <linux/init.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/io.h>
  28 #include <linux/dma-mapping.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/wait.h>
  31 #include <linux/of.h>
  32 #include <linux/of_fdt.h>
  33 #include <linux/memblock.h>
  34
  35 #include "wm8505fb_regs.h"
  36 #include "wmt_ge_rops.h"
  37
  38 #define DRIVER_NAME "wm8505-fb"
  39
  40 #define to_wm8505fb_info(__info) container_of(__info, \
  41                                                 struct wm8505fb_info, fb)
  42 struct wm8505fb_info {
  43         struct fb_info          fb;
  44         void __iomem            *regbase;
  45         unsigned int            contrast;
  46 };
  47
  48
  49 static int wm8505fb_init_hw(struct fb_info *info)
  50 {
  51         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
  52
  53         int i;
  54
  55         /* I know the purpose only of few registers, so clear unknown */
  56         for (i = 0; i < 0x200; i += 4)
  57                 writel(0, fbi->regbase + i);
  58
  59         /* Set frame buffer address */
  60         writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR);
  61         writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1);
  62
  63         /*
  64          * Set in-memory picture format to RGB
  65          * 0x31C sets the correct color mode (RGB565) for WM8650
  66          * Bit 8+9 (0x300) are ignored on WM8505 as reserved
  67          */
  68         writel(0x31c,                  fbi->regbase + WMT_GOVR_COLORSPACE);
  69         writel(1,                      fbi->regbase + WMT_GOVR_COLORSPACE1);
  70
  71         /* Virtual buffer size */
  72         writel(info->var.xres,         fbi->regbase + WMT_GOVR_XRES);
  73         writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL);
  74
  75         /* black magic ;) */
  76         writel(0xf,                    fbi->regbase + WMT_GOVR_FHI);
  77         writel(4,                      fbi->regbase + WMT_GOVR_DVO_SET);
  78         writel(1,                      fbi->regbase + WMT_GOVR_MIF_ENABLE);
  79         writel(1,                      fbi->regbase + WMT_GOVR_REG_UPDATE);
  80
  81         return 0;
  82 }
  83
  84 static int wm8505fb_set_timing(struct fb_info *info)
  85 {
  86         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
  87
  88         int h_start = info->var.left_margin;
  89         int h_end = h_start + info->var.xres;
  90         int h_all = h_end + info->var.right_margin;
  91         int h_sync = info->var.hsync_len;
  92
  93         int v_start = info->var.upper_margin;
  94         int v_end = v_start + info->var.yres;
  95         int v_all = v_end + info->var.lower_margin;
  96         int v_sync = info->var.vsync_len;
  97
  98         writel(0, fbi->regbase + WMT_GOVR_TG);
  99
 100         writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START);
 101         writel(h_end,   fbi->regbase + WMT_GOVR_TIMING_H_END);
 102         writel(h_all,   fbi->regbase + WMT_GOVR_TIMING_H_ALL);
 103         writel(h_sync,  fbi->regbase + WMT_GOVR_TIMING_H_SYNC);
 104
 105         writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START);
 106         writel(v_end,   fbi->regbase + WMT_GOVR_TIMING_V_END);
 107         writel(v_all,   fbi->regbase + WMT_GOVR_TIMING_V_ALL);
 108         writel(v_sync,  fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
 109
 110         writel(1, fbi->regbase + WMT_GOVR_TG);
 111
 112         return 0;
 113 }
 114
 115
 116 static int wm8505fb_set_par(struct fb_info *info)
 117 {
 118         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 119
 120         if (!fbi)
 121                 return -EINVAL;
 122
 123         if (info->var.bits_per_pixel == 32) {
 124                 info->var.red.offset = 16;
 125                 info->var.red.length = 8;
 126                 info->var.red.msb_right = 0;
 127                 info->var.green.offset = 8;
 128                 info->var.green.length = 8;
 129                 info->var.green.msb_right = 0;
 130                 info->var.blue.offset = 0;
 131                 info->var.blue.length = 8;
 132                 info->var.blue.msb_right = 0;
 133                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 134                 info->fix.line_length = info->var.xres_virtual << 2;
 135         } else if (info->var.bits_per_pixel == 16) {
 136                 info->var.red.offset = 11;
 137                 info->var.red.length = 5;
 138                 info->var.red.msb_right = 0;
 139                 info->var.green.offset = 5;
 140                 info->var.green.length = 6;
 141                 info->var.green.msb_right = 0;
 142                 info->var.blue.offset = 0;
 143                 info->var.blue.length = 5;
 144                 info->var.blue.msb_right = 0;
 145                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 146                 info->fix.line_length = info->var.xres_virtual << 1;
 147         }
 148
 149         wm8505fb_set_timing(info);
 150
 151         writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast,
 152                 fbi->regbase + WMT_GOVR_CONTRAST);
 153
 154         return 0;
 155 }
 156
 157 static ssize_t contrast_show(struct device *dev,
 158                              struct device_attribute *attr, char *buf)
 159 {
 160         struct fb_info *info = dev_get_drvdata(dev);
 161         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 162
 163         return sprintf(buf, "%d\n", fbi->contrast);
 164 }
 165
 166 static ssize_t contrast_store(struct device *dev,
 167                               struct device_attribute *attr,
 168                               const char *buf, size_t count)
 169 {
 170         struct fb_info *info = dev_get_drvdata(dev);
 171         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 172         unsigned long tmp;
 173
 174         if (strict_strtoul(buf, 10, &tmp) || (tmp > 0xff))
 175                 return -EINVAL;
 176         fbi->contrast = tmp;
 177
 178         wm8505fb_set_par(info);
 179
 180         return count;
 181 }
 182
 183 static DEVICE_ATTR(contrast, 0644, contrast_show, contrast_store);
 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 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 resource         *res;
 265         void                    *addr;
 266         int ret;
 267
 268         struct fb_videomode     of_mode;
 269         struct device_node      *np;
 270         u32                     bpp;
 271         dma_addr_t fb_mem_phys;
 272         unsigned long fb_mem_len;
 273         void *fb_mem_virt;
 274
 275         ret = -ENOMEM;
 276         fbi = NULL;
 277
 278         fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) +
 279                         sizeof(u32) * 16, GFP_KERNEL);
 280         if (!fbi) {
 281                 dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
 282                 ret = -ENOMEM;
 283                 goto failed;
 284         }
 285
 286         strcpy(fbi->fb.fix.id, DRIVER_NAME);
 287
 288         fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
 289         fbi->fb.fix.xpanstep    = 1;
 290         fbi->fb.fix.ypanstep    = 1;
 291         fbi->fb.fix.ywrapstep   = 0;
 292         fbi->fb.fix.accel       = FB_ACCEL_NONE;
 293
 294         fbi->fb.fbops           = &wm8505fb_ops;
 295         fbi->fb.flags           = FBINFO_DEFAULT
 296                                 | FBINFO_HWACCEL_COPYAREA
 297                                 | FBINFO_HWACCEL_FILLRECT
 298                                 | FBINFO_HWACCEL_XPAN
 299                                 | FBINFO_HWACCEL_YPAN
 300                                 | FBINFO_VIRTFB
 301                                 | FBINFO_PARTIAL_PAN_OK;
 302         fbi->fb.node            = -1;
 303
 304         addr = fbi;
 305         addr = addr + sizeof(struct wm8505fb_info);
 306         fbi->fb.pseudo_palette  = addr;
 307
 308         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 309         if (res == NULL) {
 310                 dev_err(&pdev->dev, "no I/O memory resource defined\n");
 311                 ret = -ENODEV;
 312                 goto failed_fbi;
 313         }
 314
 315         res = request_mem_region(res->start, resource_size(res), DRIVER_NAME);
 316         if (res == NULL) {
 317                 dev_err(&pdev->dev, "failed to request I/O memory\n");
 318                 ret = -EBUSY;
 319                 goto failed_fbi;
 320         }
 321
 322         fbi->regbase = ioremap(res->start, resource_size(res));
 323         if (fbi->regbase == NULL) {
 324                 dev_err(&pdev->dev, "failed to map I/O memory\n");
 325                 ret = -EBUSY;
 326                 goto failed_free_res;
 327         }
 328
 329         np = of_parse_phandle(pdev->dev.of_node, "default-mode", 0);
 330         if (!np) {
 331                 pr_err("%s: No display description in Device Tree\n", __func__);
 332                 ret = -EINVAL;
 333                 goto failed_free_res;
 334         }
 335
 336         /*
 337          * This code is copied from Sascha Hauer's of_videomode helper
 338          * and can be replaced with a call to the helper once mainlined
 339          */
 340         ret = 0;
 341         ret |= of_property_read_u32(np, "hactive", &of_mode.xres);
 342         ret |= of_property_read_u32(np, "vactive", &of_mode.yres);
 343         ret |= of_property_read_u32(np, "hback-porch", &of_mode.left_margin);
 344         ret |= of_property_read_u32(np, "hfront-porch", &of_mode.right_margin);
 345         ret |= of_property_read_u32(np, "hsync-len", &of_mode.hsync_len);
 346         ret |= of_property_read_u32(np, "vback-porch", &of_mode.upper_margin);
 347         ret |= of_property_read_u32(np, "vfront-porch", &of_mode.lower_margin);
 348         ret |= of_property_read_u32(np, "vsync-len", &of_mode.vsync_len);
 349         ret |= of_property_read_u32(np, "bpp", &bpp);
 350         if (ret) {
 351                 pr_err("%s: Unable to read display properties\n", __func__);
 352                 goto failed_free_res;
 353         }
 354
 355         of_mode.vmode = FB_VMODE_NONINTERLACED;
 356         fb_videomode_to_var(&fbi->fb.var, &of_mode);
 357
 358         fbi->fb.var.nonstd              = 0;
 359         fbi->fb.var.activate            = FB_ACTIVATE_NOW;
 360
 361         fbi->fb.var.height              = -1;
 362         fbi->fb.var.width               = -1;
 363
 364         /* try allocating the framebuffer */
 365         fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
 366         fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
 367                                 GFP_KERNEL);
 368         if (!fb_mem_virt) {
 369                 pr_err("%s: Failed to allocate framebuffer\n", __func__);
 370                 return -ENOMEM;
 371         };
 372
 373         fbi->fb.var.xres_virtual        = of_mode.xres;
 374         fbi->fb.var.yres_virtual        = of_mode.yres * 2;
 375         fbi->fb.var.bits_per_pixel      = bpp;
 376
 377         fbi->fb.fix.smem_start          = fb_mem_phys;
 378         fbi->fb.fix.smem_len            = fb_mem_len;
 379         fbi->fb.screen_base             = fb_mem_virt;
 380         fbi->fb.screen_size             = fb_mem_len;
 381
 382         if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
 383                 dev_err(&pdev->dev, "Failed to allocate color map\n");
 384                 ret = -ENOMEM;
 385                 goto failed_free_io;
 386         }
 387
 388         wm8505fb_init_hw(&fbi->fb);
 389
 390         fbi->contrast = 0x80;
 391         ret = wm8505fb_set_par(&fbi->fb);
 392         if (ret) {
 393                 dev_err(&pdev->dev, "Failed to set parameters\n");
 394                 goto failed_free_cmap;
 395         }
 396
 397         platform_set_drvdata(pdev, fbi);
 398
 399         ret = register_framebuffer(&fbi->fb);
 400         if (ret < 0) {
 401                 dev_err(&pdev->dev,
 402                         "Failed to register framebuffer device: %d\n", ret);
 403                 goto failed_free_cmap;
 404         }
 405
 406         ret = device_create_file(&pdev->dev, &dev_attr_contrast);
 407         if (ret < 0) {
 408                 printk(KERN_WARNING "fb%d: failed to register attributes (%d)\n",
 409                         fbi->fb.node, ret);
 410         }
 411
 412         printk(KERN_INFO "fb%d: %s frame buffer at 0x%lx-0x%lx\n",
 413                fbi->fb.node, fbi->fb.fix.id, fbi->fb.fix.smem_start,
 414                fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);
 415
 416         return 0;
 417
 418 failed_free_cmap:
 419         if (fbi->fb.cmap.len)
 420                 fb_dealloc_cmap(&fbi->fb.cmap);
 421 failed_free_io:
 422         iounmap(fbi->regbase);
 423 failed_free_res:
 424         release_mem_region(res->start, resource_size(res));
 425 failed_fbi:
 426         platform_set_drvdata(pdev, NULL);
 427         kfree(fbi);
 428 failed:
 429         return ret;
 430 }
 431
 432 static int wm8505fb_remove(struct platform_device *pdev)
 433 {
 434         struct wm8505fb_info *fbi = platform_get_drvdata(pdev);
 435         struct resource *res;
 436
 437         device_remove_file(&pdev->dev, &dev_attr_contrast);
 438
 439         unregister_framebuffer(&fbi->fb);
 440
 441         writel(0, fbi->regbase);
 442
 443         if (fbi->fb.cmap.len)
 444                 fb_dealloc_cmap(&fbi->fb.cmap);
 445
 446         iounmap(fbi->regbase);
 447
 448         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 449         release_mem_region(res->start, resource_size(res));
 450
 451         kfree(fbi);
 452
 453         return 0;
 454 }
 455
 456 static const struct of_device_id wmt_dt_ids[] = {
 457         { .compatible = "wm,wm8505-fb", },
 458         {}
 459 };
 460
 461 static struct platform_driver wm8505fb_driver = {
 462         .probe          = wm8505fb_probe,
 463         .remove         = wm8505fb_remove,
 464         .driver         = {
 465                 .owner  = THIS_MODULE,
 466                 .name   = DRIVER_NAME,
 467                 .of_match_table = of_match_ptr(wmt_dt_ids),
 468         },
 469 };
 470
 471 module_platform_driver(wm8505fb_driver);
 472
 473 MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
 474 MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
 475 MODULE_LICENSE("GPL v2");
 476 MODULE_DEVICE_TABLE(of, wmt_dt_ids);