linux/drivers/video/wm8505fb.c
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   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#include <linux/of.h>
  32#include <linux/of_fdt.h>
  33#include <linux/memblock.h>
  34
  35#include <linux/platform_data/video-vt8500lcdfb.h>
  36
  37#include "wm8505fb_regs.h"
  38#include "wmt_ge_rops.h"
  39
  40#define DRIVER_NAME "wm8505-fb"
  41
  42#define to_wm8505fb_info(__info) container_of(__info, \
  43                                                struct wm8505fb_info, fb)
  44struct wm8505fb_info {
  45        struct fb_info          fb;
  46        void __iomem            *regbase;
  47        unsigned int            contrast;
  48};
  49
  50
  51static int wm8505fb_init_hw(struct fb_info *info)
  52{
  53        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
  54
  55        int i;
  56
  57        /* I know the purpose only of few registers, so clear unknown */
  58        for (i = 0; i < 0x200; i += 4)
  59                writel(0, fbi->regbase + i);
  60
  61        /* Set frame buffer address */
  62        writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR);
  63        writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1);
  64
  65        /*
  66         * Set in-memory picture format to RGB
  67         * 0x31C sets the correct color mode (RGB565) for WM8650
  68         * Bit 8+9 (0x300) are ignored on WM8505 as reserved
  69         */
  70        writel(0x31c,                  fbi->regbase + WMT_GOVR_COLORSPACE);
  71        writel(1,                      fbi->regbase + WMT_GOVR_COLORSPACE1);
  72
  73        /* Virtual buffer size */
  74        writel(info->var.xres,         fbi->regbase + WMT_GOVR_XRES);
  75        writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL);
  76
  77        /* black magic ;) */
  78        writel(0xf,                    fbi->regbase + WMT_GOVR_FHI);
  79        writel(4,                      fbi->regbase + WMT_GOVR_DVO_SET);
  80        writel(1,                      fbi->regbase + WMT_GOVR_MIF_ENABLE);
  81        writel(1,                      fbi->regbase + WMT_GOVR_REG_UPDATE);
  82
  83        return 0;
  84}
  85
  86static int wm8505fb_set_timing(struct fb_info *info)
  87{
  88        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
  89
  90        int h_start = info->var.left_margin;
  91        int h_end = h_start + info->var.xres;
  92        int h_all = h_end + info->var.right_margin;
  93        int h_sync = info->var.hsync_len;
  94
  95        int v_start = info->var.upper_margin;
  96        int v_end = v_start + info->var.yres;
  97        int v_all = v_end + info->var.lower_margin;
  98        int v_sync = info->var.vsync_len;
  99
 100        writel(0, fbi->regbase + WMT_GOVR_TG);
 101
 102        writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START);
 103        writel(h_end,   fbi->regbase + WMT_GOVR_TIMING_H_END);
 104        writel(h_all,   fbi->regbase + WMT_GOVR_TIMING_H_ALL);
 105        writel(h_sync,  fbi->regbase + WMT_GOVR_TIMING_H_SYNC);
 106
 107        writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START);
 108        writel(v_end,   fbi->regbase + WMT_GOVR_TIMING_V_END);
 109        writel(v_all,   fbi->regbase + WMT_GOVR_TIMING_V_ALL);
 110        writel(v_sync,  fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
 111
 112        writel(1, fbi->regbase + WMT_GOVR_TG);
 113
 114        return 0;
 115}
 116
 117
 118static int wm8505fb_set_par(struct fb_info *info)
 119{
 120        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 121
 122        if (!fbi)
 123                return -EINVAL;
 124
 125        if (info->var.bits_per_pixel == 32) {
 126                info->var.red.offset = 16;
 127                info->var.red.length = 8;
 128                info->var.red.msb_right = 0;
 129                info->var.green.offset = 8;
 130                info->var.green.length = 8;
 131                info->var.green.msb_right = 0;
 132                info->var.blue.offset = 0;
 133                info->var.blue.length = 8;
 134                info->var.blue.msb_right = 0;
 135                info->fix.visual = FB_VISUAL_TRUECOLOR;
 136                info->fix.line_length = info->var.xres_virtual << 2;
 137        } else if (info->var.bits_per_pixel == 16) {
 138                info->var.red.offset = 11;
 139                info->var.red.length = 5;
 140                info->var.red.msb_right = 0;
 141                info->var.green.offset = 5;
 142                info->var.green.length = 6;
 143                info->var.green.msb_right = 0;
 144                info->var.blue.offset = 0;
 145                info->var.blue.length = 5;
 146                info->var.blue.msb_right = 0;
 147                info->fix.visual = FB_VISUAL_TRUECOLOR;
 148                info->fix.line_length = info->var.xres_virtual << 1;
 149        }
 150
 151        wm8505fb_set_timing(info);
 152
 153        writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast,
 154                fbi->regbase + WMT_GOVR_CONTRAST);
 155
 156        return 0;
 157}
 158
 159static ssize_t contrast_show(struct device *dev,
 160                             struct device_attribute *attr, char *buf)
 161{
 162        struct fb_info *info = dev_get_drvdata(dev);
 163        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 164
 165        return sprintf(buf, "%d\n", fbi->contrast);
 166}
 167
 168static ssize_t contrast_store(struct device *dev,
 169                              struct device_attribute *attr,
 170                              const char *buf, size_t count)
 171{
 172        struct fb_info *info = dev_get_drvdata(dev);
 173        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 174        unsigned long tmp;
 175
 176        if (strict_strtoul(buf, 10, &tmp) || (tmp > 0xff))
 177                return -EINVAL;
 178        fbi->contrast = tmp;
 179
 180        wm8505fb_set_par(info);
 181
 182        return count;
 183}
 184
 185static DEVICE_ATTR(contrast, 0644, contrast_show, contrast_store);
 186
 187static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 188{
 189        chan &= 0xffff;
 190        chan >>= 16 - bf->length;
 191        return chan << bf->offset;
 192}
 193
 194static int wm8505fb_setcolreg(unsigned regno, unsigned red, unsigned green,
 195                           unsigned blue, unsigned transp,
 196                           struct fb_info *info) {
 197        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 198        int ret = 1;
 199        unsigned int val;
 200        if (regno >= 256)
 201                return -EINVAL;
 202
 203        if (info->var.grayscale)
 204                red = green = blue =
 205                        (19595 * red + 38470 * green + 7471 * blue) >> 16;
 206
 207        switch (fbi->fb.fix.visual) {
 208        case FB_VISUAL_TRUECOLOR:
 209                if (regno < 16) {
 210                        u32 *pal = info->pseudo_palette;
 211
 212                        val  = chan_to_field(red, &fbi->fb.var.red);
 213                        val |= chan_to_field(green, &fbi->fb.var.green);
 214                        val |= chan_to_field(blue, &fbi->fb.var.blue);
 215
 216                        pal[regno] = val;
 217                        ret = 0;
 218                }
 219                break;
 220        }
 221
 222        return ret;
 223}
 224
 225static int wm8505fb_pan_display(struct fb_var_screeninfo *var,
 226                                struct fb_info *info)
 227{
 228        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 229
 230        writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN);
 231        writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN);
 232        return 0;
 233}
 234
 235static int wm8505fb_blank(int blank, struct fb_info *info)
 236{
 237        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 238
 239        switch (blank) {
 240        case FB_BLANK_UNBLANK:
 241                wm8505fb_set_timing(info);
 242                break;
 243        default:
 244                writel(0,  fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
 245                break;
 246        }
 247
 248        return 0;
 249}
 250
 251static struct fb_ops wm8505fb_ops = {
 252        .owner          = THIS_MODULE,
 253        .fb_set_par     = wm8505fb_set_par,
 254        .fb_setcolreg   = wm8505fb_setcolreg,
 255        .fb_fillrect    = wmt_ge_fillrect,
 256        .fb_copyarea    = wmt_ge_copyarea,
 257        .fb_imageblit   = sys_imageblit,
 258        .fb_sync        = wmt_ge_sync,
 259        .fb_pan_display = wm8505fb_pan_display,
 260        .fb_blank       = wm8505fb_blank,
 261};
 262
 263static int __devinit wm8505fb_probe(struct platform_device *pdev)
 264{
 265        struct wm8505fb_info    *fbi;
 266        struct resource         *res;
 267        void                    *addr;
 268        int ret;
 269
 270        struct fb_videomode     of_mode;
 271        struct device_node      *np;
 272        u32                     bpp;
 273        dma_addr_t fb_mem_phys;
 274        unsigned long fb_mem_len;
 275        void *fb_mem_virt;
 276
 277        ret = -ENOMEM;
 278        fbi = NULL;
 279
 280        fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) +
 281                        sizeof(u32) * 16, 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, DRIVER_NAME);
 289
 290        fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
 291        fbi->fb.fix.xpanstep    = 1;
 292        fbi->fb.fix.ypanstep    = 1;
 293        fbi->fb.fix.ywrapstep   = 0;
 294        fbi->fb.fix.accel       = FB_ACCEL_NONE;
 295
 296        fbi->fb.fbops           = &wm8505fb_ops;
 297        fbi->fb.flags           = FBINFO_DEFAULT
 298                                | FBINFO_HWACCEL_COPYAREA
 299                                | FBINFO_HWACCEL_FILLRECT
 300                                | FBINFO_HWACCEL_XPAN
 301                                | FBINFO_HWACCEL_YPAN
 302                                | FBINFO_VIRTFB
 303                                | FBINFO_PARTIAL_PAN_OK;
 304        fbi->fb.node            = -1;
 305
 306        addr = fbi;
 307        addr = addr + sizeof(struct wm8505fb_info);
 308        fbi->fb.pseudo_palette  = addr;
 309
 310        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 311        if (res == NULL) {
 312                dev_err(&pdev->dev, "no I/O memory resource defined\n");
 313                ret = -ENODEV;
 314                goto failed_fbi;
 315        }
 316
 317        res = request_mem_region(res->start, resource_size(res), DRIVER_NAME);
 318        if (res == NULL) {
 319                dev_err(&pdev->dev, "failed to request I/O memory\n");
 320                ret = -EBUSY;
 321                goto failed_fbi;
 322        }
 323
 324        fbi->regbase = ioremap(res->start, resource_size(res));
 325        if (fbi->regbase == NULL) {
 326                dev_err(&pdev->dev, "failed to map I/O memory\n");
 327                ret = -EBUSY;
 328                goto failed_free_res;
 329        }
 330
 331        np = of_parse_phandle(pdev->dev.of_node, "default-mode", 0);
 332        if (!np) {
 333                pr_err("%s: No display description in Device Tree\n", __func__);
 334                ret = -EINVAL;
 335                goto failed_free_res;
 336        }
 337
 338        /*
 339         * This code is copied from Sascha Hauer's of_videomode helper
 340         * and can be replaced with a call to the helper once mainlined
 341         */
 342        ret = 0;
 343        ret |= of_property_read_u32(np, "hactive", &of_mode.xres);
 344        ret |= of_property_read_u32(np, "vactive", &of_mode.yres);
 345        ret |= of_property_read_u32(np, "hback-porch", &of_mode.left_margin);
 346        ret |= of_property_read_u32(np, "hfront-porch", &of_mode.right_margin);
 347        ret |= of_property_read_u32(np, "hsync-len", &of_mode.hsync_len);
 348        ret |= of_property_read_u32(np, "vback-porch", &of_mode.upper_margin);
 349        ret |= of_property_read_u32(np, "vfront-porch", &of_mode.lower_margin);
 350        ret |= of_property_read_u32(np, "vsync-len", &of_mode.vsync_len);
 351        ret |= of_property_read_u32(np, "bpp", &bpp);
 352        if (ret) {
 353                pr_err("%s: Unable to read display properties\n", __func__);
 354                goto failed_free_res;
 355        }
 356
 357        of_mode.vmode = FB_VMODE_NONINTERLACED;
 358        fb_videomode_to_var(&fbi->fb.var, &of_mode);
 359
 360        fbi->fb.var.nonstd              = 0;
 361        fbi->fb.var.activate            = FB_ACTIVATE_NOW;
 362
 363        fbi->fb.var.height              = -1;
 364        fbi->fb.var.width               = -1;
 365
 366        /* try allocating the framebuffer */
 367        fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
 368        fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
 369                                GFP_KERNEL);
 370        if (!fb_mem_virt) {
 371                pr_err("%s: Failed to allocate framebuffer\n", __func__);
 372                return -ENOMEM;
 373        };
 374
 375        fbi->fb.var.xres_virtual        = of_mode.xres;
 376        fbi->fb.var.yres_virtual        = of_mode.yres * 2;
 377        fbi->fb.var.bits_per_pixel      = bpp;
 378
 379        fbi->fb.fix.smem_start          = fb_mem_phys;
 380        fbi->fb.fix.smem_len            = fb_mem_len;
 381        fbi->fb.screen_base             = fb_mem_virt;
 382        fbi->fb.screen_size             = fb_mem_len;
 383
 384        if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
 385                dev_err(&pdev->dev, "Failed to allocate color map\n");
 386                ret = -ENOMEM;
 387                goto failed_free_io;
 388        }
 389
 390        wm8505fb_init_hw(&fbi->fb);
 391
 392        fbi->contrast = 0x80;
 393        ret = wm8505fb_set_par(&fbi->fb);
 394        if (ret) {
 395                dev_err(&pdev->dev, "Failed to set parameters\n");
 396                goto failed_free_cmap;
 397        }
 398
 399        platform_set_drvdata(pdev, fbi);
 400
 401        ret = register_framebuffer(&fbi->fb);
 402        if (ret < 0) {
 403                dev_err(&pdev->dev,
 404                        "Failed to register framebuffer device: %d\n", ret);
 405                goto failed_free_cmap;
 406        }
 407
 408        ret = device_create_file(&pdev->dev, &dev_attr_contrast);
 409        if (ret < 0) {
 410                printk(KERN_WARNING "fb%d: failed to register attributes (%d)\n",
 411                        fbi->fb.node, ret);
 412        }
 413
 414        printk(KERN_INFO "fb%d: %s frame buffer at 0x%lx-0x%lx\n",
 415               fbi->fb.node, fbi->fb.fix.id, fbi->fb.fix.smem_start,
 416               fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);
 417
 418        return 0;
 419
 420failed_free_cmap:
 421        if (fbi->fb.cmap.len)
 422                fb_dealloc_cmap(&fbi->fb.cmap);
 423failed_free_io:
 424        iounmap(fbi->regbase);
 425failed_free_res:
 426        release_mem_region(res->start, resource_size(res));
 427failed_fbi:
 428        platform_set_drvdata(pdev, NULL);
 429        kfree(fbi);
 430failed:
 431        return ret;
 432}
 433
 434static int __devexit wm8505fb_remove(struct platform_device *pdev)
 435{
 436        struct wm8505fb_info *fbi = platform_get_drvdata(pdev);
 437        struct resource *res;
 438
 439        device_remove_file(&pdev->dev, &dev_attr_contrast);
 440
 441        unregister_framebuffer(&fbi->fb);
 442
 443        writel(0, fbi->regbase);
 444
 445        if (fbi->fb.cmap.len)
 446                fb_dealloc_cmap(&fbi->fb.cmap);
 447
 448        iounmap(fbi->regbase);
 449
 450        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 451        release_mem_region(res->start, resource_size(res));
 452
 453        kfree(fbi);
 454
 455        return 0;
 456}
 457
 458static const struct of_device_id wmt_dt_ids[] = {
 459        { .compatible = "wm,wm8505-fb", },
 460        {}
 461};
 462
 463static struct platform_driver wm8505fb_driver = {
 464        .probe          = wm8505fb_probe,
 465        .remove         = __devexit_p(wm8505fb_remove),
 466        .driver         = {
 467                .owner  = THIS_MODULE,
 468                .name   = DRIVER_NAME,
 469                .of_match_table = of_match_ptr(wmt_dt_ids),
 470        },
 471};
 472
 473module_platform_driver(wm8505fb_driver);
 474
 475MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
 476MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
 477MODULE_LICENSE("GPL v2");
 478MODULE_DEVICE_TABLE(of, wmt_dt_ids);
 479
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