linux/drivers/video/vt8500lcdfb.c
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   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
  48static 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
 143static 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
 150static 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
 189static 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
 211static 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 */
 231static 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
 252static 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
 265static 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
 276static int __devinit 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
 453failed_free_cmap:
 454        if (fbi->fb.cmap.len)
 455                fb_dealloc_cmap(&fbi->fb.cmap);
 456failed_free_irq:
 457        free_irq(irq, fbi);
 458failed_free_palette:
 459        dma_free_coherent(&pdev->dev, fbi->palette_size,
 460                          fbi->palette_cpu, fbi->palette_phys);
 461failed_free_io:
 462        iounmap(fbi->regbase);
 463failed_free_res:
 464        release_mem_region(res->start, resource_size(res));
 465failed_fbi:
 466        platform_set_drvdata(pdev, NULL);
 467        kfree(fbi);
 468failed:
 469        return ret;
 470}
 471
 472static int __devexit 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
 501static const struct of_device_id via_dt_ids[] = {
 502        { .compatible = "via,vt8500-fb", },
 503        {}
 504};
 505
 506static struct platform_driver vt8500lcd_driver = {
 507        .probe          = vt8500lcd_probe,
 508        .remove         = __devexit_p(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
 516module_platform_driver(vt8500lcd_driver);
 517
 518MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
 519MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
 520MODULE_LICENSE("GPL v2");
 521MODULE_DEVICE_TABLE(of, via_dt_ids);
 522
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