drivers/video/wm8505fb.c

   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)
  44 struct wm8505fb_info {
  45         struct fb_info          fb;
  46         void __iomem            *regbase;
  47         unsigned int            contrast;
  48 };
  49
  50
  51 static 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
  86 static 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
 118 static 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
 159 static 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
 168 static 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
 185 static DEVICE_ATTR(contrast, 0644, contrast_show, contrast_store);
 186
 187 static 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
 194 static 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
 225 static 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
 235 static 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
 251 static 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
 263 static 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
 385 static 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
 401 static const struct of_device_id wmt_dt_ids[] = {
 402         { .compatible = "wm,wm8505-fb", },
 403         {}
 404 };
 405
 406 static 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
 416 module_platform_driver(wm8505fb_driver);
 417
 418 MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
 419 MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
 420 MODULE_LICENSE("GPL v2");
 421 MODULE_DEVICE_TABLE(of, wmt_dt_ids);