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/delay.h>
  18#include <linux/dma-mapping.h>
  19#include <linux/fb.h>
  20#include <linux/errno.h>
  21#include <linux/err.h>
  22#include <linux/init.h>
  23#include <linux/interrupt.h>
  24#include <linux/io.h>
  25#include <linux/kernel.h>
  26#include <linux/memblock.h>
  27#include <linux/mm.h>
  28#include <linux/module.h>
  29#include <linux/of.h>
  30#include <linux/of_fdt.h>
  31#include <linux/platform_device.h>
  32#include <linux/slab.h>
  33#include <linux/string.h>
  34#include <linux/wait.h>
  35#include <video/of_display_timing.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 (kstrtoul(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 wm8505fb_probe(struct platform_device *pdev)
 264{
 265        struct wm8505fb_info    *fbi;
 266        struct resource *res;
 267        struct display_timings *disp_timing;
 268        void                    *addr;
 269        int ret;
 270
 271        struct fb_videomode     mode;
 272        u32                     bpp;
 273        dma_addr_t fb_mem_phys;
 274        unsigned long fb_mem_len;
 275        void *fb_mem_virt;
 276
 277        fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) +
 278                        sizeof(u32) * 16, GFP_KERNEL);
 279        if (!fbi) {
 280                dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
 281                return -ENOMEM;
 282        }
 283
 284        strcpy(fbi->fb.fix.id, DRIVER_NAME);
 285
 286        fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
 287        fbi->fb.fix.xpanstep    = 1;
 288        fbi->fb.fix.ypanstep    = 1;
 289        fbi->fb.fix.ywrapstep   = 0;
 290        fbi->fb.fix.accel       = FB_ACCEL_NONE;
 291
 292        fbi->fb.fbops           = &wm8505fb_ops;
 293        fbi->fb.flags           = FBINFO_DEFAULT
 294                                | FBINFO_HWACCEL_COPYAREA
 295                                | FBINFO_HWACCEL_FILLRECT
 296                                | FBINFO_HWACCEL_XPAN
 297                                | FBINFO_HWACCEL_YPAN
 298                                | FBINFO_VIRTFB
 299                                | FBINFO_PARTIAL_PAN_OK;
 300        fbi->fb.node            = -1;
 301
 302        addr = fbi;
 303        addr = addr + sizeof(struct wm8505fb_info);
 304        fbi->fb.pseudo_palette  = addr;
 305
 306        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 307        fbi->regbase = devm_ioremap_resource(&pdev->dev, res);
 308        if (IS_ERR(fbi->regbase))
 309                return PTR_ERR(fbi->regbase);
 310
 311        disp_timing = of_get_display_timings(pdev->dev.of_node);
 312        if (!disp_timing)
 313                return -EINVAL;
 314
 315        ret = of_get_fb_videomode(pdev->dev.of_node, &mode, OF_USE_NATIVE_MODE);
 316        if (ret)
 317                return ret;
 318
 319        ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
 320        if (ret)
 321                return ret;
 322
 323        fb_videomode_to_var(&fbi->fb.var, &mode);
 324
 325        fbi->fb.var.nonstd              = 0;
 326        fbi->fb.var.activate            = FB_ACTIVATE_NOW;
 327
 328        fbi->fb.var.height              = -1;
 329        fbi->fb.var.width               = -1;
 330
 331        /* try allocating the framebuffer */
 332        fb_mem_len = mode.xres * mode.yres * 2 * (bpp / 8);
 333        fb_mem_virt = dmam_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
 334                                GFP_KERNEL);
 335        if (!fb_mem_virt) {
 336                pr_err("%s: Failed to allocate framebuffer\n", __func__);
 337                return -ENOMEM;
 338        }
 339
 340        fbi->fb.var.xres_virtual        = mode.xres;
 341        fbi->fb.var.yres_virtual        = mode.yres * 2;
 342        fbi->fb.var.bits_per_pixel      = bpp;
 343
 344        fbi->fb.fix.smem_start          = fb_mem_phys;
 345        fbi->fb.fix.smem_len            = fb_mem_len;
 346        fbi->fb.screen_base             = fb_mem_virt;
 347        fbi->fb.screen_size             = fb_mem_len;
 348
 349        fbi->contrast = 0x10;
 350        ret = wm8505fb_set_par(&fbi->fb);
 351        if (ret) {
 352                dev_err(&pdev->dev, "Failed to set parameters\n");
 353                return ret;
 354        }
 355
 356        if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
 357                dev_err(&pdev->dev, "Failed to allocate color map\n");
 358                return -ENOMEM;
 359        }
 360
 361        wm8505fb_init_hw(&fbi->fb);
 362
 363        platform_set_drvdata(pdev, fbi);
 364
 365        ret = register_framebuffer(&fbi->fb);
 366        if (ret < 0) {
 367                dev_err(&pdev->dev,
 368                        "Failed to register framebuffer device: %d\n", ret);
 369                if (fbi->fb.cmap.len)
 370                        fb_dealloc_cmap(&fbi->fb.cmap);
 371                return ret;
 372        }
 373
 374        ret = device_create_file(&pdev->dev, &dev_attr_contrast);
 375        if (ret < 0)
 376                fb_warn(&fbi->fb, "failed to register attributes (%d)\n", ret);
 377
 378        fb_info(&fbi->fb, "%s frame buffer at 0x%lx-0x%lx\n",
 379                fbi->fb.fix.id, fbi->fb.fix.smem_start,
 380                fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);
 381
 382        return 0;
 383}
 384
 385static int wm8505fb_remove(struct platform_device *pdev)
 386{
 387        struct wm8505fb_info *fbi = platform_get_drvdata(pdev);
 388
 389        device_remove_file(&pdev->dev, &dev_attr_contrast);
 390
 391        unregister_framebuffer(&fbi->fb);
 392
 393        writel(0, fbi->regbase);
 394
 395        if (fbi->fb.cmap.len)
 396                fb_dealloc_cmap(&fbi->fb.cmap);
 397
 398        return 0;
 399}
 400
 401static const struct of_device_id wmt_dt_ids[] = {
 402        { .compatible = "wm,wm8505-fb", },
 403        {}
 404};
 405
 406static struct platform_driver wm8505fb_driver = {
 407        .probe          = wm8505fb_probe,
 408        .remove         = wm8505fb_remove,
 409        .driver         = {
 410                .owner  = THIS_MODULE,
 411                .name   = DRIVER_NAME,
 412                .of_match_table = wmt_dt_ids,
 413        },
 414};
 415
 416module_platform_driver(wm8505fb_driver);
 417
 418MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
 419MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
 420MODULE_LICENSE("GPL v2");
 421MODULE_DEVICE_TABLE(of, wmt_dt_ids);
 422
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