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 static struct fb_ops vt8500lcd_ops = {
 219         .owner          = THIS_MODULE,
 220         .fb_set_par     = vt8500lcd_set_par,
 221         .fb_setcolreg   = vt8500lcd_setcolreg,
 222         .fb_fillrect    = wmt_ge_fillrect,
 223         .fb_copyarea    = wmt_ge_copyarea,
 224         .fb_imageblit   = sys_imageblit,
 225         .fb_sync        = wmt_ge_sync,
 226         .fb_ioctl       = vt8500lcd_ioctl,
 227         .fb_pan_display = vt8500lcd_pan_display,
 228 };
 229
 230 static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
 231 {
 232         struct vt8500lcd_info *fbi = dev_id;
 233
 234         if (readl(fbi->regbase + 0x38) & (1 << 3))
 235                 wake_up_interruptible(&fbi->wait);
 236
 237         writel(0xffffffff, fbi->regbase + 0x38);
 238         return IRQ_HANDLED;
 239 }
 240
 241 static int __devinit vt8500lcd_probe(struct platform_device *pdev)
 242 {
 243         struct vt8500lcd_info *fbi;
 244         struct resource *res;
 245         struct vt8500fb_platform_data *pdata = pdev->dev.platform_data;
 246         void *addr;
 247         int irq, ret;
 248
 249         ret = -ENOMEM;
 250         fbi = NULL;
 251
 252         fbi = kzalloc(sizeof(struct vt8500lcd_info) + sizeof(u32) * 16,
 253                                                         GFP_KERNEL);
 254         if (!fbi) {
 255                 dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
 256                 ret = -ENOMEM;
 257                 goto failed;
 258         }
 259
 260         strcpy(fbi->fb.fix.id, "VT8500 LCD");
 261
 262         fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
 263         fbi->fb.fix.xpanstep    = 0;
 264         fbi->fb.fix.ypanstep    = 1;
 265         fbi->fb.fix.ywrapstep   = 0;
 266         fbi->fb.fix.accel       = FB_ACCEL_NONE;
 267
 268         fbi->fb.var.nonstd      = 0;
 269         fbi->fb.var.activate    = FB_ACTIVATE_NOW;
 270         fbi->fb.var.height      = -1;
 271         fbi->fb.var.width       = -1;
 272         fbi->fb.var.vmode       = FB_VMODE_NONINTERLACED;
 273
 274         fbi->fb.fbops           = &vt8500lcd_ops;
 275         fbi->fb.flags           = FBINFO_DEFAULT
 276                                 | FBINFO_HWACCEL_COPYAREA
 277                                 | FBINFO_HWACCEL_FILLRECT
 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 vt8500lcd_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), "vt8500lcd");
 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         fbi->fb.fix.smem_start  = pdata->video_mem_phys;
 309         fbi->fb.fix.smem_len    = pdata->video_mem_len;
 310         fbi->fb.screen_base     = pdata->video_mem_virt;
 311
 312         fbi->palette_size       = PAGE_ALIGN(512);
 313         fbi->palette_cpu        = dma_alloc_coherent(&pdev->dev,
 314                                                      fbi->palette_size,
 315                                                      &fbi->palette_phys,
 316                                                      GFP_KERNEL);
 317         if (fbi->palette_cpu == NULL) {
 318                 dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
 319                 ret = -ENOMEM;
 320                 goto failed_free_io;
 321         }
 322
 323         irq = platform_get_irq(pdev, 0);
 324         if (irq < 0) {
 325                 dev_err(&pdev->dev, "no IRQ defined\n");
 326                 ret = -ENODEV;
 327                 goto failed_free_palette;
 328         }
 329
 330         ret = request_irq(irq, vt8500lcd_handle_irq, IRQF_DISABLED, "LCD", fbi);
 331         if (ret) {
 332                 dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
 333                 ret = -EBUSY;
 334                 goto failed_free_palette;
 335         }
 336
 337         init_waitqueue_head(&fbi->wait);
 338
 339         if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
 340                 dev_err(&pdev->dev, "Failed to allocate color map\n");
 341                 ret = -ENOMEM;
 342                 goto failed_free_irq;
 343         }
 344
 345         fb_videomode_to_var(&fbi->fb.var, &pdata->mode);
 346         fbi->fb.var.bits_per_pixel      = pdata->bpp;
 347         fbi->fb.var.xres_virtual        = pdata->xres_virtual;
 348         fbi->fb.var.yres_virtual        = pdata->yres_virtual;
 349
 350         ret = vt8500lcd_set_par(&fbi->fb);
 351         if (ret) {
 352                 dev_err(&pdev->dev, "Failed to set parameters\n");
 353                 goto failed_free_cmap;
 354         }
 355
 356         writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
 357         writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);
 358
 359         platform_set_drvdata(pdev, fbi);
 360
 361         ret = register_framebuffer(&fbi->fb);
 362         if (ret < 0) {
 363                 dev_err(&pdev->dev,
 364                         "Failed to register framebuffer device: %d\n", ret);
 365                 goto failed_free_cmap;
 366         }
 367
 368         /*
 369          * Ok, now enable the LCD controller
 370          */
 371         writel(readl(fbi->regbase) | 1, fbi->regbase);
 372
 373         return 0;
 374
 375 failed_free_cmap:
 376         if (fbi->fb.cmap.len)
 377                 fb_dealloc_cmap(&fbi->fb.cmap);
 378 failed_free_irq:
 379         free_irq(irq, fbi);
 380 failed_free_palette:
 381         dma_free_coherent(&pdev->dev, fbi->palette_size,
 382                           fbi->palette_cpu, fbi->palette_phys);
 383 failed_free_io:
 384         iounmap(fbi->regbase);
 385 failed_free_res:
 386         release_mem_region(res->start, resource_size(res));
 387 failed_fbi:
 388         platform_set_drvdata(pdev, NULL);
 389         kfree(fbi);
 390 failed:
 391         return ret;
 392 }
 393
 394 static int __devexit vt8500lcd_remove(struct platform_device *pdev)
 395 {
 396         struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
 397         struct resource *res;
 398         int irq;
 399
 400         unregister_framebuffer(&fbi->fb);
 401
 402         writel(0, fbi->regbase);
 403
 404         if (fbi->fb.cmap.len)
 405                 fb_dealloc_cmap(&fbi->fb.cmap);
 406
 407         irq = platform_get_irq(pdev, 0);
 408         free_irq(irq, fbi);
 409
 410         dma_free_coherent(&pdev->dev, fbi->palette_size,
 411                           fbi->palette_cpu, fbi->palette_phys);
 412
 413         iounmap(fbi->regbase);
 414
 415         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 416         release_mem_region(res->start, resource_size(res));
 417
 418         kfree(fbi);
 419
 420         return 0;
 421 }
 422
 423 static struct platform_driver vt8500lcd_driver = {
 424         .probe          = vt8500lcd_probe,
 425         .remove         = __devexit_p(vt8500lcd_remove),
 426         .driver         = {
 427                 .owner  = THIS_MODULE,
 428                 .name   = "vt8500-lcd",
 429         },
 430 };
 431
 432 static int __init vt8500lcd_init(void)
 433 {
 434         return platform_driver_register(&vt8500lcd_driver);
 435 }
 436
 437 static void __exit vt8500lcd_exit(void)
 438 {
 439         platform_driver_unregister(&vt8500lcd_driver);
 440 }
 441
 442 module_init(vt8500lcd_init);
 443 module_exit(vt8500lcd_exit);
 444
 445 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
 446 MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
 447 MODULE_LICENSE("GPL");