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
  32 #include <mach/vt8500fb.h>
  33
  34 #include "wm8505fb_regs.h"
  35 #include "wmt_ge_rops.h"
  36
  37 #define DRIVER_NAME "wm8505-fb"
  38
  39 #define to_wm8505fb_info(__info) container_of(__info, \
  40                                                 struct wm8505fb_info, fb)
  41 struct wm8505fb_info {
  42         struct fb_info          fb;
  43         void __iomem            *regbase;
  44         unsigned int            contrast;
  45 };
  46
  47
  48 static int wm8505fb_init_hw(struct fb_info *info)
  49 {
  50         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
  51
  52         int i;
  53
  54         /* I know the purpose only of few registers, so clear unknown */
  55         for (i = 0; i < 0x200; i += 4)
  56                 writel(0, fbi->regbase + i);
  57
  58         /* Set frame buffer address */
  59         writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR);
  60         writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1);
  61
  62         /* Set in-memory picture format to RGB 32bpp */
  63         writel(0x1c,                   fbi->regbase + WMT_GOVR_COLORSPACE);
  64         writel(1,                      fbi->regbase + WMT_GOVR_COLORSPACE1);
  65
  66         /* Virtual buffer size */
  67         writel(info->var.xres,         fbi->regbase + WMT_GOVR_XRES);
  68         writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL);
  69
  70         /* black magic ;) */
  71         writel(0xf,                    fbi->regbase + WMT_GOVR_FHI);
  72         writel(4,                      fbi->regbase + WMT_GOVR_DVO_SET);
  73         writel(1,                      fbi->regbase + WMT_GOVR_MIF_ENABLE);
  74         writel(1,                      fbi->regbase + WMT_GOVR_REG_UPDATE);
  75
  76         return 0;
  77 }
  78
  79 static int wm8505fb_set_timing(struct fb_info *info)
  80 {
  81         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
  82
  83         int h_start = info->var.left_margin;
  84         int h_end = h_start + info->var.xres;
  85         int h_all = h_end + info->var.right_margin;
  86         int h_sync = info->var.hsync_len;
  87
  88         int v_start = info->var.upper_margin;
  89         int v_end = v_start + info->var.yres;
  90         int v_all = v_end + info->var.lower_margin;
  91         int v_sync = info->var.vsync_len;
  92
  93         writel(0, fbi->regbase + WMT_GOVR_TG);
  94
  95         writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START);
  96         writel(h_end,   fbi->regbase + WMT_GOVR_TIMING_H_END);
  97         writel(h_all,   fbi->regbase + WMT_GOVR_TIMING_H_ALL);
  98         writel(h_sync,  fbi->regbase + WMT_GOVR_TIMING_H_SYNC);
  99
 100         writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START);
 101         writel(v_end,   fbi->regbase + WMT_GOVR_TIMING_V_END);
 102         writel(v_all,   fbi->regbase + WMT_GOVR_TIMING_V_ALL);
 103         writel(v_sync,  fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
 104
 105         writel(1, fbi->regbase + WMT_GOVR_TG);
 106
 107         return 0;
 108 }
 109
 110
 111 static int wm8505fb_set_par(struct fb_info *info)
 112 {
 113         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 114
 115         if (!fbi)
 116                 return -EINVAL;
 117
 118         if (info->var.bits_per_pixel == 32) {
 119                 info->var.red.offset = 16;
 120                 info->var.red.length = 8;
 121                 info->var.red.msb_right = 0;
 122                 info->var.green.offset = 8;
 123                 info->var.green.length = 8;
 124                 info->var.green.msb_right = 0;
 125                 info->var.blue.offset = 0;
 126                 info->var.blue.length = 8;
 127                 info->var.blue.msb_right = 0;
 128                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 129                 info->fix.line_length = info->var.xres_virtual << 2;
 130         }
 131
 132         wm8505fb_set_timing(info);
 133
 134         writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast,
 135                 fbi->regbase + WMT_GOVR_CONTRAST);
 136
 137         return 0;
 138 }
 139
 140 static ssize_t contrast_show(struct device *dev,
 141                              struct device_attribute *attr, char *buf)
 142 {
 143         struct fb_info *info = dev_get_drvdata(dev);
 144         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 145
 146         return sprintf(buf, "%d\n", fbi->contrast);
 147 }
 148
 149 static ssize_t contrast_store(struct device *dev,
 150                               struct device_attribute *attr,
 151                               const char *buf, size_t count)
 152 {
 153         struct fb_info *info = dev_get_drvdata(dev);
 154         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 155         unsigned long tmp;
 156
 157         if (strict_strtoul(buf, 10, &tmp) || (tmp > 0xff))
 158                 return -EINVAL;
 159         fbi->contrast = tmp;
 160
 161         wm8505fb_set_par(info);
 162
 163         return count;
 164 }
 165
 166 static DEVICE_ATTR(contrast, 0644, contrast_show, contrast_store);
 167
 168 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 169 {
 170         chan &= 0xffff;
 171         chan >>= 16 - bf->length;
 172         return chan << bf->offset;
 173 }
 174
 175 static int wm8505fb_setcolreg(unsigned regno, unsigned red, unsigned green,
 176                            unsigned blue, unsigned transp,
 177                            struct fb_info *info) {
 178         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 179         int ret = 1;
 180         unsigned int val;
 181         if (regno >= 256)
 182                 return -EINVAL;
 183
 184         if (info->var.grayscale)
 185                 red = green = blue =
 186                         (19595 * red + 38470 * green + 7471 * blue) >> 16;
 187
 188         switch (fbi->fb.fix.visual) {
 189         case FB_VISUAL_TRUECOLOR:
 190                 if (regno < 16) {
 191                         u32 *pal = info->pseudo_palette;
 192
 193                         val  = chan_to_field(red, &fbi->fb.var.red);
 194                         val |= chan_to_field(green, &fbi->fb.var.green);
 195                         val |= chan_to_field(blue, &fbi->fb.var.blue);
 196
 197                         pal[regno] = val;
 198                         ret = 0;
 199                 }
 200                 break;
 201         }
 202
 203         return ret;
 204 }
 205
 206 static int wm8505fb_pan_display(struct fb_var_screeninfo *var,
 207                                 struct fb_info *info)
 208 {
 209         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 210
 211         writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN);
 212         writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN);
 213         return 0;
 214 }
 215
 216 static int wm8505fb_blank(int blank, struct fb_info *info)
 217 {
 218         struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 219
 220         switch (blank) {
 221         case FB_BLANK_UNBLANK:
 222                 wm8505fb_set_timing(info);
 223                 break;
 224         default:
 225                 writel(0,  fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
 226                 break;
 227         }
 228
 229         return 0;
 230 }
 231
 232 static struct fb_ops wm8505fb_ops = {
 233         .owner          = THIS_MODULE,
 234         .fb_set_par     = wm8505fb_set_par,
 235         .fb_setcolreg   = wm8505fb_setcolreg,
 236         .fb_fillrect    = wmt_ge_fillrect,
 237         .fb_copyarea    = wmt_ge_copyarea,
 238         .fb_imageblit   = sys_imageblit,
 239         .fb_sync        = wmt_ge_sync,
 240         .fb_pan_display = wm8505fb_pan_display,
 241         .fb_blank       = wm8505fb_blank,
 242 };
 243
 244 static int __devinit wm8505fb_probe(struct platform_device *pdev)
 245 {
 246         struct wm8505fb_info    *fbi;
 247         struct resource         *res;
 248         void                    *addr;
 249         struct vt8500fb_platform_data *pdata;
 250         int ret;
 251
 252         pdata = pdev->dev.platform_data;
 253
 254         ret = -ENOMEM;
 255         fbi = NULL;
 256
 257         fbi = kzalloc(sizeof(struct wm8505fb_info) + sizeof(u32) * 16,
 258                                                         GFP_KERNEL);
 259         if (!fbi) {
 260                 dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
 261                 ret = -ENOMEM;
 262                 goto failed;
 263         }
 264
 265         strcpy(fbi->fb.fix.id, DRIVER_NAME);
 266
 267         fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
 268         fbi->fb.fix.xpanstep    = 1;
 269         fbi->fb.fix.ypanstep    = 1;
 270         fbi->fb.fix.ywrapstep   = 0;
 271         fbi->fb.fix.accel       = FB_ACCEL_NONE;
 272
 273         fbi->fb.fbops           = &wm8505fb_ops;
 274         fbi->fb.flags           = FBINFO_DEFAULT
 275                                 | FBINFO_HWACCEL_COPYAREA
 276                                 | FBINFO_HWACCEL_FILLRECT
 277                                 | FBINFO_HWACCEL_XPAN
 278                                 | FBINFO_HWACCEL_YPAN
 279                                 | FBINFO_VIRTFB
 280                                 | FBINFO_PARTIAL_PAN_OK;
 281         fbi->fb.node            = -1;
 282
 283         addr = fbi;
 284         addr = addr + sizeof(struct wm8505fb_info);
 285         fbi->fb.pseudo_palette  = addr;
 286
 287         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 288         if (res == NULL) {
 289                 dev_err(&pdev->dev, "no I/O memory resource defined\n");
 290                 ret = -ENODEV;
 291                 goto failed_fbi;
 292         }
 293
 294         res = request_mem_region(res->start, resource_size(res), DRIVER_NAME);
 295         if (res == NULL) {
 296                 dev_err(&pdev->dev, "failed to request I/O memory\n");
 297                 ret = -EBUSY;
 298                 goto failed_fbi;
 299         }
 300
 301         fbi->regbase = ioremap(res->start, resource_size(res));
 302         if (fbi->regbase == NULL) {
 303                 dev_err(&pdev->dev, "failed to map I/O memory\n");
 304                 ret = -EBUSY;
 305                 goto failed_free_res;
 306         }
 307
 308         fb_videomode_to_var(&fbi->fb.var, &pdata->mode);
 309
 310         fbi->fb.var.nonstd              = 0;
 311         fbi->fb.var.activate            = FB_ACTIVATE_NOW;
 312
 313         fbi->fb.var.height              = -1;
 314         fbi->fb.var.width               = -1;
 315         fbi->fb.var.xres_virtual        = pdata->xres_virtual;
 316         fbi->fb.var.yres_virtual        = pdata->yres_virtual;
 317         fbi->fb.var.bits_per_pixel      = pdata->bpp;
 318
 319         fbi->fb.fix.smem_start  = pdata->video_mem_phys;
 320         fbi->fb.fix.smem_len    = pdata->video_mem_len;
 321         fbi->fb.screen_base     = pdata->video_mem_virt;
 322         fbi->fb.screen_size     = pdata->video_mem_len;
 323
 324         if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
 325                 dev_err(&pdev->dev, "Failed to allocate color map\n");
 326                 ret = -ENOMEM;
 327                 goto failed_free_io;
 328         }
 329
 330         wm8505fb_init_hw(&fbi->fb);
 331
 332         fbi->contrast = 0x80;
 333         ret = wm8505fb_set_par(&fbi->fb);
 334         if (ret) {
 335                 dev_err(&pdev->dev, "Failed to set parameters\n");
 336                 goto failed_free_cmap;
 337         }
 338
 339         platform_set_drvdata(pdev, fbi);
 340
 341         ret = register_framebuffer(&fbi->fb);
 342         if (ret < 0) {
 343                 dev_err(&pdev->dev,
 344                         "Failed to register framebuffer device: %d\n", ret);
 345                 goto failed_free_cmap;
 346         }
 347
 348         ret = device_create_file(&pdev->dev, &dev_attr_contrast);
 349         if (ret < 0) {
 350                 printk(KERN_WARNING "fb%d: failed to register attributes (%d)\n",
 351                         fbi->fb.node, ret);
 352         }
 353
 354         printk(KERN_INFO "fb%d: %s frame buffer at 0x%lx-0x%lx\n",
 355                fbi->fb.node, fbi->fb.fix.id, fbi->fb.fix.smem_start,
 356                fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);
 357
 358         return 0;
 359
 360 failed_free_cmap:
 361         if (fbi->fb.cmap.len)
 362                 fb_dealloc_cmap(&fbi->fb.cmap);
 363 failed_free_io:
 364         iounmap(fbi->regbase);
 365 failed_free_res:
 366         release_mem_region(res->start, resource_size(res));
 367 failed_fbi:
 368         platform_set_drvdata(pdev, NULL);
 369         kfree(fbi);
 370 failed:
 371         return ret;
 372 }
 373
 374 static int __devexit wm8505fb_remove(struct platform_device *pdev)
 375 {
 376         struct wm8505fb_info *fbi = platform_get_drvdata(pdev);
 377         struct resource *res;
 378
 379         device_remove_file(&pdev->dev, &dev_attr_contrast);
 380
 381         unregister_framebuffer(&fbi->fb);
 382
 383         writel(0, fbi->regbase);
 384
 385         if (fbi->fb.cmap.len)
 386                 fb_dealloc_cmap(&fbi->fb.cmap);
 387
 388         iounmap(fbi->regbase);
 389
 390         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 391         release_mem_region(res->start, resource_size(res));
 392
 393         kfree(fbi);
 394
 395         return 0;
 396 }
 397
 398 static struct platform_driver wm8505fb_driver = {
 399         .probe          = wm8505fb_probe,
 400         .remove         = __devexit_p(wm8505fb_remove),
 401         .driver         = {
 402                 .owner  = THIS_MODULE,
 403                 .name   = DRIVER_NAME,
 404         },
 405 };
 406
 407 static int __init wm8505fb_init(void)
 408 {
 409         return platform_driver_register(&wm8505fb_driver);
 410 }
 411
 412 static void __exit wm8505fb_exit(void)
 413 {
 414         platform_driver_unregister(&wm8505fb_driver);
 415 }
 416
 417 module_init(wm8505fb_init);
 418 module_exit(wm8505fb_exit);
 419
 420 MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
 421 MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
 422 MODULE_LICENSE("GPL");