drivers/video/vt8500lcdfb.c

   1 /*
   2  *  linux/drivers/video/vt8500lcdfb.c
   3  *
   4  *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
   5  *
   6  * Based on skeletonfb.c and pxafb.c
   7  *
   8  * This software is licensed under the terms of the GNU General Public
   9  * License version 2, as published by the Free Software Foundation, and
  10  * may be copied, distributed, and modified under those terms.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/errno.h>
  21 #include <linux/string.h>
  22 #include <linux/mm.h>
  23 #include <linux/slab.h>
  24 #include <linux/delay.h>
  25 #include <linux/fb.h>
  26 #include <linux/init.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/io.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/wait.h>
  32
  33 #include <mach/vt8500fb.h>
  34
  35 #include "vt8500lcdfb.h"
  36 #include "wmt_ge_rops.h"
  37
  38 #define to_vt8500lcd_info(__info) container_of(__info, \
  39                                                 struct vt8500lcd_info, fb)
  40
  41 static int vt8500lcd_set_par(struct fb_info *info)
  42 {
  43         struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
  44         int reg_bpp = 5; /* 16bpp */
  45         int i;
  46         unsigned long control0;
  47
  48         if (!fbi)
  49                 return -EINVAL;
  50
  51         if (info->var.bits_per_pixel <= 8) {
  52                 /* palettized */
  53                 info->var.red.offset    = 0;
  54                 info->var.red.length    = info->var.bits_per_pixel;
  55                 info->var.red.msb_right = 0;
  56
  57                 info->var.green.offset  = 0;
  58                 info->var.green.length  = info->var.bits_per_pixel;
  59                 info->var.green.msb_right = 0;
  60
  61                 info->var.blue.offset   = 0;
  62                 info->var.blue.length   = info->var.bits_per_pixel;
  63                 info->var.blue.msb_right = 0;
  64
  65                 info->var.transp.offset = 0;
  66                 info->var.transp.length = 0;
  67                 info->var.transp.msb_right = 0;
  68
  69                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
  70                 info->fix.line_length = info->var.xres_virtual /
  71                                                 (8/info->var.bits_per_pixel);
  72         } else {
  73                 /* non-palettized */
  74                 info->var.transp.offset = 0;
  75                 info->var.transp.length = 0;
  76                 info->var.transp.msb_right = 0;
  77
  78                 if (info->var.bits_per_pixel == 16) {
  79                         /* RGB565 */
  80                         info->var.red.offset = 11;
  81                         info->var.red.length = 5;
  82                         info->var.red.msb_right = 0;
  83                         info->var.green.offset = 5;
  84                         info->var.green.length = 6;
  85                         info->var.green.msb_right = 0;
  86                         info->var.blue.offset = 0;
  87                         info->var.blue.length = 5;
  88                         info->var.blue.msb_right = 0;
  89                 } else {
  90                         /* Equal depths per channel */
  91                         info->var.red.offset = info->var.bits_per_pixel
  92                                                         * 2 / 3;
  93                         info->var.red.length = info->var.bits_per_pixel / 3;
  94                         info->var.red.msb_right = 0;
  95                         info->var.green.offset = info->var.bits_per_pixel / 3;
  96                         info->var.green.length = info->var.bits_per_pixel / 3;
  97                         info->var.green.msb_right = 0;
  98                         info->var.blue.offset = 0;
  99                         info->var.blue.length = info->var.bits_per_pixel / 3;
 100                         info->var.blue.msb_right = 0;
 101                 }
 102
 103                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 104                 info->fix.line_length = info->var.bits_per_pixel > 16 ?
 105                                         info->var.xres_virtual << 2 :
 106                                         info->var.xres_virtual << 1;
 107         }
 108
 109         for (i = 0; i < 8; i++) {
 110                 if (bpp_values[i] == info->var.bits_per_pixel) {
 111                         reg_bpp = i;
 112                         continue;
 113                 }
 114         }
 115
 116         control0 = readl(fbi->regbase) & ~0xf;
 117         writel(0, fbi->regbase);
 118         while (readl(fbi->regbase + 0x38) & 0x10)
 119                 /* wait */;
 120         writel((((info->var.hsync_len - 1) & 0x3f) << 26)
 121                 | ((info->var.left_margin & 0xff) << 18)
 122                 | (((info->var.xres - 1) & 0x3ff) << 8)
 123                 | (info->var.right_margin & 0xff), fbi->regbase + 0x4);
 124         writel((((info->var.vsync_len - 1) & 0x3f) << 26)
 125                 | ((info->var.upper_margin & 0xff) << 18)
 126                 | (((info->var.yres - 1) & 0x3ff) << 8)
 127                 | (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
 128         writel((((info->var.yres - 1) & 0x400) << 2)
 129                 | ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
 130         writel(0x80000000, fbi->regbase + 0x20);
 131         writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase);
 132
 133         return 0;
 134 }
 135
 136 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 137 {
 138         chan &= 0xffff;
 139         chan >>= 16 - bf->length;
 140         return chan << bf->offset;
 141 }
 142
 143 static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
 144                            unsigned blue, unsigned transp,
 145                            struct fb_info *info) {
 146         struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
 147         int ret = 1;
 148         unsigned int val;
 149         if (regno >= 256)
 150                 return -EINVAL;
 151
 152         if (info->var.grayscale)
 153                 red = green = blue =
 154                         (19595 * red + 38470 * green + 7471 * blue) >> 16;
 155
 156         switch (fbi->fb.fix.visual) {
 157         case FB_VISUAL_TRUECOLOR:
 158                 if (regno < 16) {
 159                         u32 *pal = fbi->fb.pseudo_palette;
 160
 161                         val  = chan_to_field(red, &fbi->fb.var.red);
 162                         val |= chan_to_field(green, &fbi->fb.var.green);
 163                         val |= chan_to_field(blue, &fbi->fb.var.blue);
 164
 165                         pal[regno] = val;
 166                         ret = 0;
 167                 }
 168                 break;
 169
 170         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 171         case FB_VISUAL_PSEUDOCOLOR:
 172                 writew((red & 0xf800)
 173                       | ((green >> 5) & 0x7e0)
 174                       | ((blue >> 11) & 0x1f),
 175                        fbi->palette_cpu + sizeof(u16) * regno);
 176                 break;
 177         }
 178
 179         return ret;
 180 }
 181
 182 static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
 183                          unsigned long arg)
 184 {
 185         int ret = 0;
 186         struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
 187
 188         if (cmd == FBIO_WAITFORVSYNC) {
 189                 /* Unmask End of Frame interrupt */
 190                 writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
 191                 ret = wait_event_interruptible_timeout(fbi->wait,
 192                         readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
 193                 /* Mask back to reduce unwanted interrupt traffic */
 194                 writel(0xffffffff, fbi->regbase + 0x3c);
 195                 if (ret < 0)
 196                         return ret;
 197                 if (ret == 0)
 198                         return -ETIMEDOUT;
 199         }
 200
 201         return ret;
 202 }
 203
 204 static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
 205                                 struct fb_info *info)
 206 {
 207         unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
 208         unsigned off = pixlen * var->xoffset
 209                       + info->fix.line_length * var->yoffset;
 210         struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
 211
 212         writel((1 << 31)
 213                 | (((var->xres_virtual - var->xres) * pixlen / 4) << 20)
 214                 | (off >> 2), fbi->regbase + 0x20);
 215         return 0;
 216 }
 217
 218 /*
 219  * vt8500lcd_blank():
 220  *      Blank the display by setting all palette values to zero.  Note,
 221  *      True Color modes do not really use the palette, so this will not
 222  *      blank the display in all modes.
 223  */
 224 static int vt8500lcd_blank(int blank, struct fb_info *info)
 225 {
 226         int i;
 227
 228         switch (blank) {
 229         case FB_BLANK_POWERDOWN:
 230         case FB_BLANK_VSYNC_SUSPEND:
 231         case FB_BLANK_HSYNC_SUSPEND:
 232         case FB_BLANK_NORMAL:
 233                 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
 234                     info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 235                         for (i = 0; i < 256; i++)
 236                                 vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
 237         case FB_BLANK_UNBLANK:
 238                 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
 239                     info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 240                         fb_set_cmap(&info->cmap, info);
 241         }
 242         return 0;
 243 }
 244
 245 static struct fb_ops vt8500lcd_ops = {
 246         .owner          = THIS_MODULE,
 247         .fb_set_par     = vt8500lcd_set_par,
 248         .fb_setcolreg   = vt8500lcd_setcolreg,
 249         .fb_fillrect    = wmt_ge_fillrect,
 250         .fb_copyarea    = wmt_ge_copyarea,
 251         .fb_imageblit   = sys_imageblit,
 252         .fb_sync        = wmt_ge_sync,
 253         .fb_ioctl       = vt8500lcd_ioctl,
 254         .fb_pan_display = vt8500lcd_pan_display,
 255         .fb_blank       = vt8500lcd_blank,
 256 };
 257
 258 static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
 259 {
 260         struct vt8500lcd_info *fbi = dev_id;
 261
 262         if (readl(fbi->regbase + 0x38) & (1 << 3))
 263                 wake_up_interruptible(&fbi->wait);
 264
 265         writel(0xffffffff, fbi->regbase + 0x38);
 266         return IRQ_HANDLED;
 267 }
 268
 269 static int __devinit vt8500lcd_probe(struct platform_device *pdev)
 270 {
 271         struct vt8500lcd_info *fbi;
 272         struct resource *res;
 273         struct vt8500fb_platform_data *pdata = pdev->dev.platform_data;
 274         void *addr;
 275         int irq, ret;
 276
 277         ret = -ENOMEM;
 278         fbi = NULL;
 279
 280         fbi = kzalloc(sizeof(struct vt8500lcd_info) + sizeof(u32) * 16,
 281                                                         GFP_KERNEL);
 282         if (!fbi) {
 283                 dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
 284                 ret = -ENOMEM;
 285                 goto failed;
 286         }
 287
 288         strcpy(fbi->fb.fix.id, "VT8500 LCD");
 289
 290         fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
 291         fbi->fb.fix.xpanstep    = 0;
 292         fbi->fb.fix.ypanstep    = 1;
 293         fbi->fb.fix.ywrapstep   = 0;
 294         fbi->fb.fix.accel       = FB_ACCEL_NONE;
 295
 296         fbi->fb.var.nonstd      = 0;
 297         fbi->fb.var.activate    = FB_ACTIVATE_NOW;
 298         fbi->fb.var.height      = -1;
 299         fbi->fb.var.width       = -1;
 300         fbi->fb.var.vmode       = FB_VMODE_NONINTERLACED;
 301
 302         fbi->fb.fbops           = &vt8500lcd_ops;
 303         fbi->fb.flags           = FBINFO_DEFAULT
 304                                 | FBINFO_HWACCEL_COPYAREA
 305                                 | FBINFO_HWACCEL_FILLRECT
 306                                 | FBINFO_HWACCEL_YPAN
 307                                 | FBINFO_VIRTFB
 308                                 | FBINFO_PARTIAL_PAN_OK;
 309         fbi->fb.node            = -1;
 310
 311         addr = fbi;
 312         addr = addr + sizeof(struct vt8500lcd_info);
 313         fbi->fb.pseudo_palette  = addr;
 314
 315         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 316         if (res == NULL) {
 317                 dev_err(&pdev->dev, "no I/O memory resource defined\n");
 318                 ret = -ENODEV;
 319                 goto failed_fbi;
 320         }
 321
 322         res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
 323         if (res == NULL) {
 324                 dev_err(&pdev->dev, "failed to request I/O memory\n");
 325                 ret = -EBUSY;
 326                 goto failed_fbi;
 327         }
 328
 329         fbi->regbase = ioremap(res->start, resource_size(res));
 330         if (fbi->regbase == NULL) {
 331                 dev_err(&pdev->dev, "failed to map I/O memory\n");
 332                 ret = -EBUSY;
 333                 goto failed_free_res;
 334         }
 335
 336         fbi->fb.fix.smem_start  = pdata->video_mem_phys;
 337         fbi->fb.fix.smem_len    = pdata->video_mem_len;
 338         fbi->fb.screen_base     = pdata->video_mem_virt;
 339
 340         fbi->palette_size       = PAGE_ALIGN(512);
 341         fbi->palette_cpu        = dma_alloc_coherent(&pdev->dev,
 342                                                      fbi->palette_size,
 343                                                      &fbi->palette_phys,
 344                                                      GFP_KERNEL);
 345         if (fbi->palette_cpu == NULL) {
 346                 dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
 347                 ret = -ENOMEM;
 348                 goto failed_free_io;
 349         }
 350
 351         irq = platform_get_irq(pdev, 0);
 352         if (irq < 0) {
 353                 dev_err(&pdev->dev, "no IRQ defined\n");
 354                 ret = -ENODEV;
 355                 goto failed_free_palette;
 356         }
 357
 358         ret = request_irq(irq, vt8500lcd_handle_irq, IRQF_DISABLED, "LCD", fbi);
 359         if (ret) {
 360                 dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
 361                 ret = -EBUSY;
 362                 goto failed_free_palette;
 363         }
 364
 365         init_waitqueue_head(&fbi->wait);
 366
 367         if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
 368                 dev_err(&pdev->dev, "Failed to allocate color map\n");
 369                 ret = -ENOMEM;
 370                 goto failed_free_irq;
 371         }
 372
 373         fb_videomode_to_var(&fbi->fb.var, &pdata->mode);
 374         fbi->fb.var.bits_per_pixel      = pdata->bpp;
 375         fbi->fb.var.xres_virtual        = pdata->xres_virtual;
 376         fbi->fb.var.yres_virtual        = pdata->yres_virtual;
 377
 378         ret = vt8500lcd_set_par(&fbi->fb);
 379         if (ret) {
 380                 dev_err(&pdev->dev, "Failed to set parameters\n");
 381                 goto failed_free_cmap;
 382         }
 383
 384         writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
 385         writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);
 386
 387         platform_set_drvdata(pdev, fbi);
 388
 389         ret = register_framebuffer(&fbi->fb);
 390         if (ret < 0) {
 391                 dev_err(&pdev->dev,
 392                         "Failed to register framebuffer device: %d\n", ret);
 393                 goto failed_free_cmap;
 394         }
 395
 396         /*
 397          * Ok, now enable the LCD controller
 398          */
 399         writel(readl(fbi->regbase) | 1, fbi->regbase);
 400
 401         return 0;
 402
 403 failed_free_cmap:
 404         if (fbi->fb.cmap.len)
 405                 fb_dealloc_cmap(&fbi->fb.cmap);
 406 failed_free_irq:
 407         free_irq(irq, fbi);
 408 failed_free_palette:
 409         dma_free_coherent(&pdev->dev, fbi->palette_size,
 410                           fbi->palette_cpu, fbi->palette_phys);
 411 failed_free_io:
 412         iounmap(fbi->regbase);
 413 failed_free_res:
 414         release_mem_region(res->start, resource_size(res));
 415 failed_fbi:
 416         platform_set_drvdata(pdev, NULL);
 417         kfree(fbi);
 418 failed:
 419         return ret;
 420 }
 421
 422 static int __devexit vt8500lcd_remove(struct platform_device *pdev)
 423 {
 424         struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
 425         struct resource *res;
 426         int irq;
 427
 428         unregister_framebuffer(&fbi->fb);
 429
 430         writel(0, fbi->regbase);
 431
 432         if (fbi->fb.cmap.len)
 433                 fb_dealloc_cmap(&fbi->fb.cmap);
 434
 435         irq = platform_get_irq(pdev, 0);
 436         free_irq(irq, fbi);
 437
 438         dma_free_coherent(&pdev->dev, fbi->palette_size,
 439                           fbi->palette_cpu, fbi->palette_phys);
 440
 441         iounmap(fbi->regbase);
 442
 443         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 444         release_mem_region(res->start, resource_size(res));
 445
 446         kfree(fbi);
 447
 448         return 0;
 449 }
 450
 451 static struct platform_driver vt8500lcd_driver = {
 452         .probe          = vt8500lcd_probe,
 453         .remove         = __devexit_p(vt8500lcd_remove),
 454         .driver         = {
 455                 .owner  = THIS_MODULE,
 456                 .name   = "vt8500-lcd",
 457         },
 458 };
 459
 460 static int __init vt8500lcd_init(void)
 461 {
 462         return platform_driver_register(&vt8500lcd_driver);
 463 }
 464
 465 static void __exit vt8500lcd_exit(void)
 466 {
 467         platform_driver_unregister(&vt8500lcd_driver);
 468 }
 469
 470 module_init(vt8500lcd_init);
 471 module_exit(vt8500lcd_exit);
 472
 473 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
 474 MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
 475 MODULE_LICENSE("GPL");