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
  32#include <mach/vt8500fb.h>
  33
  34#include "wm8505fb_regs.h"
  35#include "wmt_ge_rops.h"
  36
  37#define DRIVER_NAME "wm8505-fb"
  38
  39#define to_wm8505fb_info(__info) container_of(__info, \
  40                                                struct wm8505fb_info, fb)
  41struct wm8505fb_info {
  42        struct fb_info          fb;
  43        void __iomem            *regbase;
  44        unsigned int            contrast;
  45};
  46
  47
  48static int wm8505fb_init_hw(struct fb_info *info)
  49{
  50        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
  51
  52        int i;
  53
  54        /* I know the purpose only of few registers, so clear unknown */
  55        for (i = 0; i < 0x200; i += 4)
  56                writel(0, fbi->regbase + i);
  57
  58        /* Set frame buffer address */
  59        writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR);
  60        writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1);
  61
  62        /* Set in-memory picture format to RGB 32bpp */
  63        writel(0x1c,                   fbi->regbase + WMT_GOVR_COLORSPACE);
  64        writel(1,                      fbi->regbase + WMT_GOVR_COLORSPACE1);
  65
  66        /* Virtual buffer size */
  67        writel(info->var.xres,         fbi->regbase + WMT_GOVR_XRES);
  68        writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL);
  69
  70        /* black magic ;) */
  71        writel(0xf,                    fbi->regbase + WMT_GOVR_FHI);
  72        writel(4,                      fbi->regbase + WMT_GOVR_DVO_SET);
  73        writel(1,                      fbi->regbase + WMT_GOVR_MIF_ENABLE);
  74        writel(1,                      fbi->regbase + WMT_GOVR_REG_UPDATE);
  75
  76        return 0;
  77}
  78
  79static int wm8505fb_set_timing(struct fb_info *info)
  80{
  81        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
  82
  83        int h_start = info->var.left_margin;
  84        int h_end = h_start + info->var.xres;
  85        int h_all = h_end + info->var.right_margin;
  86        int h_sync = info->var.hsync_len;
  87
  88        int v_start = info->var.upper_margin;
  89        int v_end = v_start + info->var.yres;
  90        int v_all = v_end + info->var.lower_margin;
  91        int v_sync = info->var.vsync_len;
  92
  93        writel(0, fbi->regbase + WMT_GOVR_TG);
  94
  95        writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START);
  96        writel(h_end,   fbi->regbase + WMT_GOVR_TIMING_H_END);
  97        writel(h_all,   fbi->regbase + WMT_GOVR_TIMING_H_ALL);
  98        writel(h_sync,  fbi->regbase + WMT_GOVR_TIMING_H_SYNC);
  99
 100        writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START);
 101        writel(v_end,   fbi->regbase + WMT_GOVR_TIMING_V_END);
 102        writel(v_all,   fbi->regbase + WMT_GOVR_TIMING_V_ALL);
 103        writel(v_sync,  fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
 104
 105        writel(1, fbi->regbase + WMT_GOVR_TG);
 106
 107        return 0;
 108}
 109
 110
 111static int wm8505fb_set_par(struct fb_info *info)
 112{
 113        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 114
 115        if (!fbi)
 116                return -EINVAL;
 117
 118        if (info->var.bits_per_pixel == 32) {
 119                info->var.red.offset = 16;
 120                info->var.red.length = 8;
 121                info->var.red.msb_right = 0;
 122                info->var.green.offset = 8;
 123                info->var.green.length = 8;
 124                info->var.green.msb_right = 0;
 125                info->var.blue.offset = 0;
 126                info->var.blue.length = 8;
 127                info->var.blue.msb_right = 0;
 128                info->fix.visual = FB_VISUAL_TRUECOLOR;
 129                info->fix.line_length = info->var.xres_virtual << 2;
 130        }
 131
 132        wm8505fb_set_timing(info);
 133
 134        writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast,
 135                fbi->regbase + WMT_GOVR_CONTRAST);
 136
 137        return 0;
 138}
 139
 140static ssize_t contrast_show(struct device *dev,
 141                             struct device_attribute *attr, char *buf)
 142{
 143        struct fb_info *info = dev_get_drvdata(dev);
 144        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 145
 146        return sprintf(buf, "%d\n", fbi->contrast);
 147}
 148
 149static ssize_t contrast_store(struct device *dev,
 150                              struct device_attribute *attr,
 151                              const char *buf, size_t count)
 152{
 153        struct fb_info *info = dev_get_drvdata(dev);
 154        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 155        unsigned long tmp;
 156
 157        if (strict_strtoul(buf, 10, &tmp) || (tmp > 0xff))
 158                return -EINVAL;
 159        fbi->contrast = tmp;
 160
 161        wm8505fb_set_par(info);
 162
 163        return count;
 164}
 165
 166static DEVICE_ATTR(contrast, 0644, contrast_show, contrast_store);
 167
 168static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 169{
 170        chan &= 0xffff;
 171        chan >>= 16 - bf->length;
 172        return chan << bf->offset;
 173}
 174
 175static int wm8505fb_setcolreg(unsigned regno, unsigned red, unsigned green,
 176                           unsigned blue, unsigned transp,
 177                           struct fb_info *info) {
 178        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 179        int ret = 1;
 180        unsigned int val;
 181        if (regno >= 256)
 182                return -EINVAL;
 183
 184        if (info->var.grayscale)
 185                red = green = blue =
 186                        (19595 * red + 38470 * green + 7471 * blue) >> 16;
 187
 188        switch (fbi->fb.fix.visual) {
 189        case FB_VISUAL_TRUECOLOR:
 190                if (regno < 16) {
 191                        u32 *pal = info->pseudo_palette;
 192
 193                        val  = chan_to_field(red, &fbi->fb.var.red);
 194                        val |= chan_to_field(green, &fbi->fb.var.green);
 195                        val |= chan_to_field(blue, &fbi->fb.var.blue);
 196
 197                        pal[regno] = val;
 198                        ret = 0;
 199                }
 200                break;
 201        }
 202
 203        return ret;
 204}
 205
 206static int wm8505fb_pan_display(struct fb_var_screeninfo *var,
 207                                struct fb_info *info)
 208{
 209        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 210
 211        writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN);
 212        writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN);
 213        return 0;
 214}
 215
 216static int wm8505fb_blank(int blank, struct fb_info *info)
 217{
 218        struct wm8505fb_info *fbi = to_wm8505fb_info(info);
 219
 220        switch (blank) {
 221        case FB_BLANK_UNBLANK:
 222                wm8505fb_set_timing(info);
 223                break;
 224        default:
 225                writel(0,  fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
 226                break;
 227        }
 228
 229        return 0;
 230}
 231
 232static struct fb_ops wm8505fb_ops = {
 233        .owner          = THIS_MODULE,
 234        .fb_set_par     = wm8505fb_set_par,
 235        .fb_setcolreg   = wm8505fb_setcolreg,
 236        .fb_fillrect    = wmt_ge_fillrect,
 237        .fb_copyarea    = wmt_ge_copyarea,
 238        .fb_imageblit   = sys_imageblit,
 239        .fb_sync        = wmt_ge_sync,
 240        .fb_pan_display = wm8505fb_pan_display,
 241        .fb_blank       = wm8505fb_blank,
 242};
 243
 244static int __devinit wm8505fb_probe(struct platform_device *pdev)
 245{
 246        struct wm8505fb_info    *fbi;
 247        struct resource         *res;
 248        void                    *addr;
 249        struct vt8500fb_platform_data *pdata;
 250        int ret;
 251
 252        pdata = pdev->dev.platform_data;
 253
 254        ret = -ENOMEM;
 255        fbi = NULL;
 256
 257        fbi = kzalloc(sizeof(struct wm8505fb_info) + sizeof(u32) * 16,
 258                                                        GFP_KERNEL);
 259        if (!fbi) {
 260                dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
 261                ret = -ENOMEM;
 262                goto failed;
 263        }
 264
 265        strcpy(fbi->fb.fix.id, DRIVER_NAME);
 266
 267        fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
 268        fbi->fb.fix.xpanstep    = 1;
 269        fbi->fb.fix.ypanstep    = 1;
 270        fbi->fb.fix.ywrapstep   = 0;
 271        fbi->fb.fix.accel       = FB_ACCEL_NONE;
 272
 273        fbi->fb.fbops           = &wm8505fb_ops;
 274        fbi->fb.flags           = FBINFO_DEFAULT
 275                                | FBINFO_HWACCEL_COPYAREA
 276                                | FBINFO_HWACCEL_FILLRECT
 277                                | FBINFO_HWACCEL_XPAN
 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 wm8505fb_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), DRIVER_NAME);
 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        fb_videomode_to_var(&fbi->fb.var, &pdata->mode);
 309
 310        fbi->fb.var.nonstd              = 0;
 311        fbi->fb.var.activate            = FB_ACTIVATE_NOW;
 312
 313        fbi->fb.var.height              = -1;
 314        fbi->fb.var.width               = -1;
 315        fbi->fb.var.xres_virtual        = pdata->xres_virtual;
 316        fbi->fb.var.yres_virtual        = pdata->yres_virtual;
 317        fbi->fb.var.bits_per_pixel      = pdata->bpp;
 318
 319        fbi->fb.fix.smem_start  = pdata->video_mem_phys;
 320        fbi->fb.fix.smem_len    = pdata->video_mem_len;
 321        fbi->fb.screen_base     = pdata->video_mem_virt;
 322        fbi->fb.screen_size     = pdata->video_mem_len;
 323
 324        if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
 325                dev_err(&pdev->dev, "Failed to allocate color map\n");
 326                ret = -ENOMEM;
 327                goto failed_free_io;
 328        }
 329
 330        wm8505fb_init_hw(&fbi->fb);
 331
 332        fbi->contrast = 0x80;
 333        ret = wm8505fb_set_par(&fbi->fb);
 334        if (ret) {
 335                dev_err(&pdev->dev, "Failed to set parameters\n");
 336                goto failed_free_cmap;
 337        }
 338
 339        platform_set_drvdata(pdev, fbi);
 340
 341        ret = register_framebuffer(&fbi->fb);
 342        if (ret < 0) {
 343                dev_err(&pdev->dev,
 344                        "Failed to register framebuffer device: %d\n", ret);
 345                goto failed_free_cmap;
 346        }
 347
 348        ret = device_create_file(&pdev->dev, &dev_attr_contrast);
 349        if (ret < 0) {
 350                printk(KERN_WARNING "fb%d: failed to register attributes (%d)\n",
 351                        fbi->fb.node, ret);
 352        }
 353
 354        printk(KERN_INFO "fb%d: %s frame buffer at 0x%lx-0x%lx\n",
 355               fbi->fb.node, fbi->fb.fix.id, fbi->fb.fix.smem_start,
 356               fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);
 357
 358        return 0;
 359
 360failed_free_cmap:
 361        if (fbi->fb.cmap.len)
 362                fb_dealloc_cmap(&fbi->fb.cmap);
 363failed_free_io:
 364        iounmap(fbi->regbase);
 365failed_free_res:
 366        release_mem_region(res->start, resource_size(res));
 367failed_fbi:
 368        platform_set_drvdata(pdev, NULL);
 369        kfree(fbi);
 370failed:
 371        return ret;
 372}
 373
 374static int __devexit wm8505fb_remove(struct platform_device *pdev)
 375{
 376        struct wm8505fb_info *fbi = platform_get_drvdata(pdev);
 377        struct resource *res;
 378
 379        device_remove_file(&pdev->dev, &dev_attr_contrast);
 380
 381        unregister_framebuffer(&fbi->fb);
 382
 383        writel(0, fbi->regbase);
 384
 385        if (fbi->fb.cmap.len)
 386                fb_dealloc_cmap(&fbi->fb.cmap);
 387
 388        iounmap(fbi->regbase);
 389
 390        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 391        release_mem_region(res->start, resource_size(res));
 392
 393        kfree(fbi);
 394
 395        return 0;
 396}
 397
 398static struct platform_driver wm8505fb_driver = {
 399        .probe          = wm8505fb_probe,
 400        .remove         = __devexit_p(wm8505fb_remove),
 401        .driver         = {
 402                .owner  = THIS_MODULE,
 403                .name   = DRIVER_NAME,
 404        },
 405};
 406
 407module_platform_driver(wm8505fb_driver);
 408
 409MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
 410MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
 411MODULE_LICENSE("GPL");
 412
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