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 <linux/platform_data/video-vt8500lcdfb.h>
  34
  35 #include "vt8500lcdfb.h"
  36 #include "wmt_ge_rops.h"
  37
  38 #ifdef CONFIG_OF
  39 #include <linux/of.h>
  40 #include <linux/of_fdt.h>
  41 #include <linux/memblock.h>
  42 #endif
  43
  44
  45 #define to_vt8500lcd_info(__info) container_of(__info, \
  46                                                 struct vt8500lcd_info, fb)
  47
  48 static int vt8500lcd_set_par(struct fb_info *info)
  49 {
  50         struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
  51         int reg_bpp = 5; /* 16bpp */
  52         int i;
  53         unsigned long control0;
  54
  55         if (!fbi)
  56                 return -EINVAL;
  57
  58         if (info->var.bits_per_pixel <= 8) {
  59                 /* palettized */
  60                 info->var.red.offset    = 0;
  61                 info->var.red.length    = info->var.bits_per_pixel;
  62                 info->var.red.msb_right = 0;
  63
  64                 info->var.green.offset  = 0;
  65                 info->var.green.length  = info->var.bits_per_pixel;
  66                 info->var.green.msb_right = 0;
  67
  68                 info->var.blue.offset   = 0;
  69                 info->var.blue.length   = info->var.bits_per_pixel;
  70                 info->var.blue.msb_right = 0;
  71
  72                 info->var.transp.offset = 0;
  73                 info->var.transp.length = 0;
  74                 info->var.transp.msb_right = 0;
  75
  76                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
  77                 info->fix.line_length = info->var.xres_virtual /
  78                                                 (8/info->var.bits_per_pixel);
  79         } else {
  80                 /* non-palettized */
  81                 info->var.transp.offset = 0;
  82                 info->var.transp.length = 0;
  83                 info->var.transp.msb_right = 0;
  84
  85                 if (info->var.bits_per_pixel == 16) {
  86                         /* RGB565 */
  87                         info->var.red.offset = 11;
  88                         info->var.red.length = 5;
  89                         info->var.red.msb_right = 0;
  90                         info->var.green.offset = 5;
  91                         info->var.green.length = 6;
  92                         info->var.green.msb_right = 0;
  93                         info->var.blue.offset = 0;
  94                         info->var.blue.length = 5;
  95                         info->var.blue.msb_right = 0;
  96                 } else {
  97                         /* Equal depths per channel */
  98                         info->var.red.offset = info->var.bits_per_pixel
  99                                                         * 2 / 3;
 100                         info->var.red.length = info->var.bits_per_pixel / 3;
 101                         info->var.red.msb_right = 0;
 102                         info->var.green.offset = info->var.bits_per_pixel / 3;
 103                         info->var.green.length = info->var.bits_per_pixel / 3;
 104                         info->var.green.msb_right = 0;
 105                         info->var.blue.offset = 0;
 106                         info->var.blue.length = info->var.bits_per_pixel / 3;
 107                         info->var.blue.msb_right = 0;
 108                 }
 109
 110                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 111                 info->fix.line_length = info->var.bits_per_pixel > 16 ?
 112                                         info->var.xres_virtual << 2 :
 113                                         info->var.xres_virtual << 1;
 114         }
 115
 116         for (i = 0; i < 8; i++) {
 117                 if (bpp_values[i] == info->var.bits_per_pixel) {
 118                         reg_bpp = i;
 119                         continue;
 120                 }
 121         }
 122
 123         control0 = readl(fbi->regbase) & ~0xf;
 124         writel(0, fbi->regbase);
 125         while (readl(fbi->regbase + 0x38) & 0x10)
 126                 /* wait */;
 127         writel((((info->var.hsync_len - 1) & 0x3f) << 26)
 128                 | ((info->var.left_margin & 0xff) << 18)
 129                 | (((info->var.xres - 1) & 0x3ff) << 8)
 130                 | (info->var.right_margin & 0xff), fbi->regbase + 0x4);
 131         writel((((info->var.vsync_len - 1) & 0x3f) << 26)
 132                 | ((info->var.upper_margin & 0xff) << 18)
 133                 | (((info->var.yres - 1) & 0x3ff) << 8)
 134                 | (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
 135         writel((((info->var.yres - 1) & 0x400) << 2)
 136                 | ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
 137         writel(0x80000000, fbi->regbase + 0x20);
 138         writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase);
 139
 140         return 0;
 141 }
 142
 143 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 144 {
 145         chan &= 0xffff;
 146         chan >>= 16 - bf->length;
 147         return chan << bf->offset;
 148 }
 149
 150 static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
 151                            unsigned blue, unsigned transp,
 152                            struct fb_info *info) {
 153         struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
 154         int ret = 1;
 155         unsigned int val;
 156         if (regno >= 256)
 157                 return -EINVAL;
 158
 159         if (info->var.grayscale)
 160                 red = green = blue =
 161                         (19595 * red + 38470 * green + 7471 * blue) >> 16;
 162
 163         switch (fbi->fb.fix.visual) {
 164         case FB_VISUAL_TRUECOLOR:
 165                 if (regno < 16) {
 166                         u32 *pal = fbi->fb.pseudo_palette;
 167
 168                         val  = chan_to_field(red, &fbi->fb.var.red);
 169                         val |= chan_to_field(green, &fbi->fb.var.green);
 170                         val |= chan_to_field(blue, &fbi->fb.var.blue);
 171
 172                         pal[regno] = val;
 173                         ret = 0;
 174                 }
 175                 break;
 176
 177         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 178         case FB_VISUAL_PSEUDOCOLOR:
 179                 writew((red & 0xf800)
 180                       | ((green >> 5) & 0x7e0)
 181                       | ((blue >> 11) & 0x1f),
 182                        fbi->palette_cpu + sizeof(u16) * regno);
 183                 break;
 184         }
 185
 186         return ret;
 187 }
 188
 189 static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
 190                          unsigned long arg)
 191 {
 192         int ret = 0;
 193         struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
 194
 195         if (cmd == FBIO_WAITFORVSYNC) {
 196                 /* Unmask End of Frame interrupt */
 197                 writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
 198                 ret = wait_event_interruptible_timeout(fbi->wait,
 199                         readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
 200                 /* Mask back to reduce unwanted interrupt traffic */
 201                 writel(0xffffffff, fbi->regbase + 0x3c);
 202                 if (ret < 0)
 203                         return ret;
 204                 if (ret == 0)
 205                         return -ETIMEDOUT;
 206         }
 207
 208         return ret;
 209 }
 210
 211 static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
 212                                 struct fb_info *info)
 213 {
 214         unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
 215         unsigned off = pixlen * var->xoffset
 216                       + info->fix.line_length * var->yoffset;
 217         struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
 218
 219         writel((1 << 31)
 220              | (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20)
 221              | (off >> 2), fbi->regbase + 0x20);
 222         return 0;
 223 }
 224
 225 /*
 226  * vt8500lcd_blank():
 227  *      Blank the display by setting all palette values to zero.  Note,
 228  *      True Color modes do not really use the palette, so this will not
 229  *      blank the display in all modes.
 230  */
 231 static int vt8500lcd_blank(int blank, struct fb_info *info)
 232 {
 233         int i;
 234
 235         switch (blank) {
 236         case FB_BLANK_POWERDOWN:
 237         case FB_BLANK_VSYNC_SUSPEND:
 238         case FB_BLANK_HSYNC_SUSPEND:
 239         case FB_BLANK_NORMAL:
 240                 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
 241                     info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 242                         for (i = 0; i < 256; i++)
 243                                 vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
 244         case FB_BLANK_UNBLANK:
 245                 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
 246                     info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 247                         fb_set_cmap(&info->cmap, info);
 248         }
 249         return 0;
 250 }
 251
 252 static struct fb_ops vt8500lcd_ops = {
 253         .owner          = THIS_MODULE,
 254         .fb_set_par     = vt8500lcd_set_par,
 255         .fb_setcolreg   = vt8500lcd_setcolreg,
 256         .fb_fillrect    = wmt_ge_fillrect,
 257         .fb_copyarea    = wmt_ge_copyarea,
 258         .fb_imageblit   = sys_imageblit,
 259         .fb_sync        = wmt_ge_sync,
 260         .fb_ioctl       = vt8500lcd_ioctl,
 261         .fb_pan_display = vt8500lcd_pan_display,
 262         .fb_blank       = vt8500lcd_blank,
 263 };
 264
 265 static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
 266 {
 267         struct vt8500lcd_info *fbi = dev_id;
 268
 269         if (readl(fbi->regbase + 0x38) & (1 << 3))
 270                 wake_up_interruptible(&fbi->wait);
 271
 272         writel(0xffffffff, fbi->regbase + 0x38);
 273         return IRQ_HANDLED;
 274 }
 275
 276 static int vt8500lcd_probe(struct platform_device *pdev)
 277 {
 278         struct vt8500lcd_info *fbi;
 279         struct resource *res;
 280         void *addr;
 281         int irq, ret;
 282
 283         struct fb_videomode     of_mode;
 284         struct device_node      *np;
 285         u32                     bpp;
 286         dma_addr_t fb_mem_phys;
 287         unsigned long fb_mem_len;
 288         void *fb_mem_virt;
 289
 290         ret = -ENOMEM;
 291         fbi = NULL;
 292
 293         fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info)
 294                         + sizeof(u32) * 16, GFP_KERNEL);
 295         if (!fbi) {
 296                 dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
 297                 ret = -ENOMEM;
 298                 goto failed;
 299         }
 300
 301         strcpy(fbi->fb.fix.id, "VT8500 LCD");
 302
 303         fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
 304         fbi->fb.fix.xpanstep    = 0;
 305         fbi->fb.fix.ypanstep    = 1;
 306         fbi->fb.fix.ywrapstep   = 0;
 307         fbi->fb.fix.accel       = FB_ACCEL_NONE;
 308
 309         fbi->fb.var.nonstd      = 0;
 310         fbi->fb.var.activate    = FB_ACTIVATE_NOW;
 311         fbi->fb.var.height      = -1;
 312         fbi->fb.var.width       = -1;
 313         fbi->fb.var.vmode       = FB_VMODE_NONINTERLACED;
 314
 315         fbi->fb.fbops           = &vt8500lcd_ops;
 316         fbi->fb.flags           = FBINFO_DEFAULT
 317                                 | FBINFO_HWACCEL_COPYAREA
 318                                 | FBINFO_HWACCEL_FILLRECT
 319                                 | FBINFO_HWACCEL_YPAN
 320                                 | FBINFO_VIRTFB
 321                                 | FBINFO_PARTIAL_PAN_OK;
 322         fbi->fb.node            = -1;
 323
 324         addr = fbi;
 325         addr = addr + sizeof(struct vt8500lcd_info);
 326         fbi->fb.pseudo_palette  = addr;
 327
 328         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 329         if (res == NULL) {
 330                 dev_err(&pdev->dev, "no I/O memory resource defined\n");
 331                 ret = -ENODEV;
 332                 goto failed_fbi;
 333         }
 334
 335         res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
 336         if (res == NULL) {
 337                 dev_err(&pdev->dev, "failed to request I/O memory\n");
 338                 ret = -EBUSY;
 339                 goto failed_fbi;
 340         }
 341
 342         fbi->regbase = ioremap(res->start, resource_size(res));
 343         if (fbi->regbase == NULL) {
 344                 dev_err(&pdev->dev, "failed to map I/O memory\n");
 345                 ret = -EBUSY;
 346                 goto failed_free_res;
 347         }
 348
 349         np = of_parse_phandle(pdev->dev.of_node, "default-mode", 0);
 350         if (!np) {
 351                 pr_err("%s: No display description in Device Tree\n", __func__);
 352                 ret = -EINVAL;
 353                 goto failed_free_res;
 354         }
 355
 356         /*
 357          * This code is copied from Sascha Hauer's of_videomode helper
 358          * and can be replaced with a call to the helper once mainlined
 359          */
 360         ret = 0;
 361         ret |= of_property_read_u32(np, "hactive", &of_mode.xres);
 362         ret |= of_property_read_u32(np, "vactive", &of_mode.yres);
 363         ret |= of_property_read_u32(np, "hback-porch", &of_mode.left_margin);
 364         ret |= of_property_read_u32(np, "hfront-porch", &of_mode.right_margin);
 365         ret |= of_property_read_u32(np, "hsync-len", &of_mode.hsync_len);
 366         ret |= of_property_read_u32(np, "vback-porch", &of_mode.upper_margin);
 367         ret |= of_property_read_u32(np, "vfront-porch", &of_mode.lower_margin);
 368         ret |= of_property_read_u32(np, "vsync-len", &of_mode.vsync_len);
 369         ret |= of_property_read_u32(np, "bpp", &bpp);
 370         if (ret) {
 371                 pr_err("%s: Unable to read display properties\n", __func__);
 372                 goto failed_free_res;
 373         }
 374         of_mode.vmode = FB_VMODE_NONINTERLACED;
 375
 376         /* try allocating the framebuffer */
 377         fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
 378         fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
 379                                 GFP_KERNEL);
 380         if (!fb_mem_virt) {
 381                 pr_err("%s: Failed to allocate framebuffer\n", __func__);
 382                 return -ENOMEM;
 383         };
 384
 385         fbi->fb.fix.smem_start  = fb_mem_phys;
 386         fbi->fb.fix.smem_len    = fb_mem_len;
 387         fbi->fb.screen_base     = fb_mem_virt;
 388
 389         fbi->palette_size       = PAGE_ALIGN(512);
 390         fbi->palette_cpu        = dma_alloc_coherent(&pdev->dev,
 391                                                      fbi->palette_size,
 392                                                      &fbi->palette_phys,
 393                                                      GFP_KERNEL);
 394         if (fbi->palette_cpu == NULL) {
 395                 dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
 396                 ret = -ENOMEM;
 397                 goto failed_free_io;
 398         }
 399
 400         irq = platform_get_irq(pdev, 0);
 401         if (irq < 0) {
 402                 dev_err(&pdev->dev, "no IRQ defined\n");
 403                 ret = -ENODEV;
 404                 goto failed_free_palette;
 405         }
 406
 407         ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi);
 408         if (ret) {
 409                 dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
 410                 ret = -EBUSY;
 411                 goto failed_free_palette;
 412         }
 413
 414         init_waitqueue_head(&fbi->wait);
 415
 416         if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
 417                 dev_err(&pdev->dev, "Failed to allocate color map\n");
 418                 ret = -ENOMEM;
 419                 goto failed_free_irq;
 420         }
 421
 422         fb_videomode_to_var(&fbi->fb.var, &of_mode);
 423
 424         fbi->fb.var.xres_virtual        = of_mode.xres;
 425         fbi->fb.var.yres_virtual        = of_mode.yres * 2;
 426         fbi->fb.var.bits_per_pixel      = bpp;
 427
 428         ret = vt8500lcd_set_par(&fbi->fb);
 429         if (ret) {
 430                 dev_err(&pdev->dev, "Failed to set parameters\n");
 431                 goto failed_free_cmap;
 432         }
 433
 434         writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
 435         writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);
 436
 437         platform_set_drvdata(pdev, fbi);
 438
 439         ret = register_framebuffer(&fbi->fb);
 440         if (ret < 0) {
 441                 dev_err(&pdev->dev,
 442                         "Failed to register framebuffer device: %d\n", ret);
 443                 goto failed_free_cmap;
 444         }
 445
 446         /*
 447          * Ok, now enable the LCD controller
 448          */
 449         writel(readl(fbi->regbase) | 1, fbi->regbase);
 450
 451         return 0;
 452
 453 failed_free_cmap:
 454         if (fbi->fb.cmap.len)
 455                 fb_dealloc_cmap(&fbi->fb.cmap);
 456 failed_free_irq:
 457         free_irq(irq, fbi);
 458 failed_free_palette:
 459         dma_free_coherent(&pdev->dev, fbi->palette_size,
 460                           fbi->palette_cpu, fbi->palette_phys);
 461 failed_free_io:
 462         iounmap(fbi->regbase);
 463 failed_free_res:
 464         release_mem_region(res->start, resource_size(res));
 465 failed_fbi:
 466         platform_set_drvdata(pdev, NULL);
 467         kfree(fbi);
 468 failed:
 469         return ret;
 470 }
 471
 472 static int vt8500lcd_remove(struct platform_device *pdev)
 473 {
 474         struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
 475         struct resource *res;
 476         int irq;
 477
 478         unregister_framebuffer(&fbi->fb);
 479
 480         writel(0, fbi->regbase);
 481
 482         if (fbi->fb.cmap.len)
 483                 fb_dealloc_cmap(&fbi->fb.cmap);
 484
 485         irq = platform_get_irq(pdev, 0);
 486         free_irq(irq, fbi);
 487
 488         dma_free_coherent(&pdev->dev, fbi->palette_size,
 489                           fbi->palette_cpu, fbi->palette_phys);
 490
 491         iounmap(fbi->regbase);
 492
 493         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 494         release_mem_region(res->start, resource_size(res));
 495
 496         kfree(fbi);
 497
 498         return 0;
 499 }
 500
 501 static const struct of_device_id via_dt_ids[] = {
 502         { .compatible = "via,vt8500-fb", },
 503         {}
 504 };
 505
 506 static struct platform_driver vt8500lcd_driver = {
 507         .probe          = vt8500lcd_probe,
 508         .remove         = vt8500lcd_remove,
 509         .driver         = {
 510                 .owner  = THIS_MODULE,
 511                 .name   = "vt8500-lcd",
 512                 .of_match_table = of_match_ptr(via_dt_ids),
 513         },
 514 };
 515
 516 module_platform_driver(vt8500lcd_driver);
 517
 518 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
 519 MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
 520 MODULE_LICENSE("GPL v2");
 521 MODULE_DEVICE_TABLE(of, via_dt_ids);