linux/drivers/video/ep93xx-fb.c
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   1/*
   2 * linux/drivers/video/ep93xx-fb.c
   3 *
   4 * Framebuffer support for the EP93xx series.
   5 *
   6 * Copyright (C) 2007 Bluewater Systems Ltd
   7 * Author: Ryan Mallon
   8 *
   9 * Copyright (c) 2009 H Hartley Sweeten <hsweeten@visionengravers.com>
  10 *
  11 * Based on the Cirrus Logic ep93xxfb driver, and various other ep93xxfb
  12 * drivers.
  13 *
  14 * This program is free software; you can redistribute it and/or modify
  15 * it under the terms of the GNU General Public License version 2 as
  16 * published by the Free Software Foundation.
  17 *
  18 */
  19
  20#include <linux/platform_device.h>
  21#include <linux/module.h>
  22#include <linux/dma-mapping.h>
  23#include <linux/slab.h>
  24#include <linux/clk.h>
  25#include <linux/fb.h>
  26
  27#include <mach/fb.h>
  28
  29/* Vertical Frame Timing Registers */
  30#define EP93XXFB_VLINES_TOTAL                   0x0000  /* SW locked */
  31#define EP93XXFB_VSYNC                          0x0004  /* SW locked */
  32#define EP93XXFB_VACTIVE                        0x0008  /* SW locked */
  33#define EP93XXFB_VBLANK                         0x0228  /* SW locked */
  34#define EP93XXFB_VCLK                           0x000c  /* SW locked */
  35
  36/* Horizontal Frame Timing Registers */
  37#define EP93XXFB_HCLKS_TOTAL                    0x0010  /* SW locked */
  38#define EP93XXFB_HSYNC                          0x0014  /* SW locked */
  39#define EP93XXFB_HACTIVE                        0x0018  /* SW locked */
  40#define EP93XXFB_HBLANK                         0x022c  /* SW locked */
  41#define EP93XXFB_HCLK                           0x001c  /* SW locked */
  42
  43/* Frame Buffer Memory Configuration Registers */
  44#define EP93XXFB_SCREEN_PAGE                    0x0028
  45#define EP93XXFB_SCREEN_HPAGE                   0x002c
  46#define EP93XXFB_SCREEN_LINES                   0x0030
  47#define EP93XXFB_LINE_LENGTH                    0x0034
  48#define EP93XXFB_VLINE_STEP                     0x0038
  49#define EP93XXFB_LINE_CARRY                     0x003c  /* SW locked */
  50#define EP93XXFB_EOL_OFFSET                     0x0230
  51
  52/* Other Video Registers */
  53#define EP93XXFB_BRIGHTNESS                     0x0020
  54#define EP93XXFB_ATTRIBS                        0x0024  /* SW locked */
  55#define EP93XXFB_SWLOCK                         0x007c  /* SW locked */
  56#define EP93XXFB_AC_RATE                        0x0214
  57#define EP93XXFB_FIFO_LEVEL                     0x0234
  58#define EP93XXFB_PIXELMODE                      0x0054
  59#define EP93XXFB_PIXELMODE_32BPP                (0x7 << 0)
  60#define EP93XXFB_PIXELMODE_24BPP                (0x6 << 0)
  61#define EP93XXFB_PIXELMODE_16BPP                (0x4 << 0)
  62#define EP93XXFB_PIXELMODE_8BPP                 (0x2 << 0)
  63#define EP93XXFB_PIXELMODE_SHIFT_1P_24B         (0x0 << 3)
  64#define EP93XXFB_PIXELMODE_SHIFT_1P_18B         (0x1 << 3)
  65#define EP93XXFB_PIXELMODE_COLOR_LUT            (0x0 << 10)
  66#define EP93XXFB_PIXELMODE_COLOR_888            (0x4 << 10)
  67#define EP93XXFB_PIXELMODE_COLOR_555            (0x5 << 10)
  68#define EP93XXFB_PARL_IF_OUT                    0x0058
  69#define EP93XXFB_PARL_IF_IN                     0x005c
  70
  71/* Blink Control Registers */
  72#define EP93XXFB_BLINK_RATE                     0x0040
  73#define EP93XXFB_BLINK_MASK                     0x0044
  74#define EP93XXFB_BLINK_PATTRN                   0x0048
  75#define EP93XXFB_PATTRN_MASK                    0x004c
  76#define EP93XXFB_BKGRND_OFFSET                  0x0050
  77
  78/* Hardware Cursor Registers */
  79#define EP93XXFB_CURSOR_ADR_START               0x0060
  80#define EP93XXFB_CURSOR_ADR_RESET               0x0064
  81#define EP93XXFB_CURSOR_SIZE                    0x0068
  82#define EP93XXFB_CURSOR_COLOR1                  0x006c
  83#define EP93XXFB_CURSOR_COLOR2                  0x0070
  84#define EP93XXFB_CURSOR_BLINK_COLOR1            0x021c
  85#define EP93XXFB_CURSOR_BLINK_COLOR2            0x0220
  86#define EP93XXFB_CURSOR_XY_LOC                  0x0074
  87#define EP93XXFB_CURSOR_DSCAN_HY_LOC            0x0078
  88#define EP93XXFB_CURSOR_BLINK_RATE_CTRL         0x0224
  89
  90/* LUT Registers */
  91#define EP93XXFB_GRY_SCL_LUTR                   0x0080
  92#define EP93XXFB_GRY_SCL_LUTG                   0x0280
  93#define EP93XXFB_GRY_SCL_LUTB                   0x0300
  94#define EP93XXFB_LUT_SW_CONTROL                 0x0218
  95#define EP93XXFB_LUT_SW_CONTROL_SWTCH           (1 << 0)
  96#define EP93XXFB_LUT_SW_CONTROL_SSTAT           (1 << 1)
  97#define EP93XXFB_COLOR_LUT                      0x0400
  98
  99/* Video Signature Registers */
 100#define EP93XXFB_VID_SIG_RSLT_VAL               0x0200
 101#define EP93XXFB_VID_SIG_CTRL                   0x0204
 102#define EP93XXFB_VSIG                           0x0208
 103#define EP93XXFB_HSIG                           0x020c
 104#define EP93XXFB_SIG_CLR_STR                    0x0210
 105
 106/* Minimum / Maximum resolutions supported */
 107#define EP93XXFB_MIN_XRES                       64
 108#define EP93XXFB_MIN_YRES                       64
 109#define EP93XXFB_MAX_XRES                       1024
 110#define EP93XXFB_MAX_YRES                       768
 111
 112struct ep93xx_fbi {
 113        struct ep93xxfb_mach_info       *mach_info;
 114        struct clk                      *clk;
 115        struct resource                 *res;
 116        void __iomem                    *mmio_base;
 117        unsigned int                    pseudo_palette[256];
 118};
 119
 120static int check_screenpage_bug = 1;
 121module_param(check_screenpage_bug, int, 0644);
 122MODULE_PARM_DESC(check_screenpage_bug,
 123                 "Check for bit 27 screen page bug. Default = 1");
 124
 125static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi,
 126                                          unsigned int off)
 127{
 128        return __raw_readl(fbi->mmio_base + off);
 129}
 130
 131static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi,
 132                                   unsigned int val, unsigned int off)
 133{
 134        __raw_writel(val, fbi->mmio_base + off);
 135}
 136
 137/*
 138 * Write to one of the locked raster registers.
 139 */
 140static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi,
 141                                       unsigned int val, unsigned int reg)
 142{
 143        /*
 144         * We don't need a lock or delay here since the raster register
 145         * block will remain unlocked until the next access.
 146         */
 147        ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK);
 148        ep93xxfb_writel(fbi, val, reg);
 149}
 150
 151static void ep93xxfb_set_video_attribs(struct fb_info *info)
 152{
 153        struct ep93xx_fbi *fbi = info->par;
 154        unsigned int attribs;
 155
 156        attribs = EP93XXFB_ENABLE;
 157        attribs |= fbi->mach_info->flags;
 158        ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS);
 159}
 160
 161static int ep93xxfb_set_pixelmode(struct fb_info *info)
 162{
 163        struct ep93xx_fbi *fbi = info->par;
 164        unsigned int val;
 165
 166        info->var.transp.offset = 0;
 167        info->var.transp.length = 0;
 168
 169        switch (info->var.bits_per_pixel) {
 170        case 8:
 171                val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT |
 172                        EP93XXFB_PIXELMODE_SHIFT_1P_18B;
 173
 174                info->var.red.offset    = 0;
 175                info->var.red.length    = 8;
 176                info->var.green.offset  = 0;
 177                info->var.green.length  = 8;
 178                info->var.blue.offset   = 0;
 179                info->var.blue.length   = 8;
 180                info->fix.visual        = FB_VISUAL_PSEUDOCOLOR;
 181                break;
 182
 183        case 16:
 184                val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 |
 185                        EP93XXFB_PIXELMODE_SHIFT_1P_18B;
 186
 187                info->var.red.offset    = 11;
 188                info->var.red.length    = 5;
 189                info->var.green.offset  = 5;
 190                info->var.green.length  = 6;
 191                info->var.blue.offset   = 0;
 192                info->var.blue.length   = 5;
 193                info->fix.visual        = FB_VISUAL_TRUECOLOR;
 194                break;
 195
 196        case 24:
 197                val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 |
 198                        EP93XXFB_PIXELMODE_SHIFT_1P_24B;
 199
 200                info->var.red.offset    = 16;
 201                info->var.red.length    = 8;
 202                info->var.green.offset  = 8;
 203                info->var.green.length  = 8;
 204                info->var.blue.offset   = 0;
 205                info->var.blue.length   = 8;
 206                info->fix.visual        = FB_VISUAL_TRUECOLOR;
 207                break;
 208
 209        case 32:
 210                val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 |
 211                        EP93XXFB_PIXELMODE_SHIFT_1P_24B;
 212
 213                info->var.red.offset    = 16;
 214                info->var.red.length    = 8;
 215                info->var.green.offset  = 8;
 216                info->var.green.length  = 8;
 217                info->var.blue.offset   = 0;
 218                info->var.blue.length   = 8;
 219                info->fix.visual        = FB_VISUAL_TRUECOLOR;
 220                break;
 221
 222        default:
 223                return -EINVAL;
 224        }
 225
 226        ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE);
 227        return 0;
 228}
 229
 230static void ep93xxfb_set_timing(struct fb_info *info)
 231{
 232        struct ep93xx_fbi *fbi = info->par;
 233        unsigned int vlines_total, hclks_total, start, stop;
 234
 235        vlines_total = info->var.yres + info->var.upper_margin +
 236                info->var.lower_margin + info->var.vsync_len - 1;
 237
 238        hclks_total = info->var.xres + info->var.left_margin +
 239                info->var.right_margin + info->var.hsync_len - 1;
 240
 241        ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL);
 242        ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL);
 243
 244        start = vlines_total;
 245        stop = vlines_total - info->var.vsync_len;
 246        ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC);
 247
 248        start = vlines_total - info->var.vsync_len - info->var.upper_margin;
 249        stop = info->var.lower_margin - 1;
 250        ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK);
 251        ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE);
 252
 253        start = vlines_total;
 254        stop = vlines_total + 1;
 255        ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK);
 256
 257        start = hclks_total;
 258        stop = hclks_total - info->var.hsync_len;
 259        ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC);
 260
 261        start = hclks_total - info->var.hsync_len - info->var.left_margin;
 262        stop = info->var.right_margin - 1;
 263        ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK);
 264        ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE);
 265
 266        start = hclks_total;
 267        stop = hclks_total;
 268        ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK);
 269
 270        ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY);
 271}
 272
 273static int ep93xxfb_set_par(struct fb_info *info)
 274{
 275        struct ep93xx_fbi *fbi = info->par;
 276
 277        clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock));
 278
 279        ep93xxfb_set_timing(info);
 280
 281        info->fix.line_length = info->var.xres_virtual *
 282                info->var.bits_per_pixel / 8;
 283
 284        ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE);
 285        ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES);
 286        ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel)
 287                              / 32) - 1, EP93XXFB_LINE_LENGTH);
 288        ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP);
 289        ep93xxfb_set_video_attribs(info);
 290        return 0;
 291}
 292
 293static int ep93xxfb_check_var(struct fb_var_screeninfo *var,
 294                              struct fb_info *info)
 295{
 296        int err;
 297
 298        err = ep93xxfb_set_pixelmode(info);
 299        if (err)
 300                return err;
 301
 302        var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES);
 303        var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES);
 304        var->xres_virtual = max(var->xres_virtual, var->xres);
 305
 306        var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES);
 307        var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES);
 308        var->yres_virtual = max(var->yres_virtual, var->yres);
 309
 310        return 0;
 311}
 312
 313static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 314{
 315        unsigned int offset = vma->vm_pgoff << PAGE_SHIFT;
 316
 317        if (offset < info->fix.smem_len) {
 318                return dma_mmap_writecombine(info->dev, vma, info->screen_base,
 319                                             info->fix.smem_start,
 320                                             info->fix.smem_len);
 321        }
 322
 323        return -EINVAL;
 324}
 325
 326static int ep93xxfb_blank(int blank_mode, struct fb_info *info)
 327{
 328        struct ep93xx_fbi *fbi = info->par;
 329        unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS);
 330
 331        if (blank_mode) {
 332                if (fbi->mach_info->blank)
 333                        fbi->mach_info->blank(blank_mode, info);
 334                ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE,
 335                                    EP93XXFB_ATTRIBS);
 336                clk_disable(fbi->clk);
 337        } else {
 338                clk_enable(fbi->clk);
 339                ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE,
 340                                    EP93XXFB_ATTRIBS);
 341                if (fbi->mach_info->blank)
 342                        fbi->mach_info->blank(blank_mode, info);
 343        }
 344
 345        return 0;
 346}
 347
 348static inline int ep93xxfb_convert_color(int val, int width)
 349{
 350        return ((val << width) + 0x7fff - val) >> 16;
 351}
 352
 353static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red,
 354                              unsigned int green, unsigned int blue,
 355                              unsigned int transp, struct fb_info *info)
 356{
 357        struct ep93xx_fbi *fbi = info->par;
 358        unsigned int *pal = info->pseudo_palette;
 359        unsigned int ctrl, i, rgb, lut_current, lut_stat;
 360
 361        switch (info->fix.visual) {
 362        case FB_VISUAL_PSEUDOCOLOR:
 363                if (regno > 255)
 364                        return 1;
 365                rgb = ((red & 0xff00) << 8) | (green & 0xff00) |
 366                        ((blue & 0xff00) >> 8);
 367
 368                pal[regno] = rgb;
 369                ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2)));
 370                ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL);
 371                lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT);
 372                lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH);
 373
 374                if (lut_stat == lut_current) {
 375                        for (i = 0; i < 256; i++) {
 376                                ep93xxfb_writel(fbi, pal[i],
 377                                        EP93XXFB_COLOR_LUT + (i << 2));
 378                        }
 379
 380                        ep93xxfb_writel(fbi,
 381                                        ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH,
 382                                        EP93XXFB_LUT_SW_CONTROL);
 383                }
 384                break;
 385
 386        case FB_VISUAL_TRUECOLOR:
 387                if (regno > 16)
 388                        return 1;
 389
 390                red = ep93xxfb_convert_color(red, info->var.red.length);
 391                green = ep93xxfb_convert_color(green, info->var.green.length);
 392                blue = ep93xxfb_convert_color(blue, info->var.blue.length);
 393                transp = ep93xxfb_convert_color(transp,
 394                                                info->var.transp.length);
 395
 396                pal[regno] = (red << info->var.red.offset) |
 397                        (green << info->var.green.offset) |
 398                        (blue << info->var.blue.offset) |
 399                        (transp << info->var.transp.offset);
 400                break;
 401
 402        default:
 403                return 1;
 404        }
 405
 406        return 0;
 407}
 408
 409static struct fb_ops ep93xxfb_ops = {
 410        .owner          = THIS_MODULE,
 411        .fb_check_var   = ep93xxfb_check_var,
 412        .fb_set_par     = ep93xxfb_set_par,
 413        .fb_blank       = ep93xxfb_blank,
 414        .fb_fillrect    = cfb_fillrect,
 415        .fb_copyarea    = cfb_copyarea,
 416        .fb_imageblit   = cfb_imageblit,
 417        .fb_setcolreg   = ep93xxfb_setcolreg,
 418        .fb_mmap        = ep93xxfb_mmap,
 419};
 420
 421static int __init ep93xxfb_calc_fbsize(struct ep93xxfb_mach_info *mach_info)
 422{
 423        int i, fb_size = 0;
 424
 425        if (mach_info->num_modes == EP93XXFB_USE_MODEDB) {
 426                fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES *
 427                        mach_info->bpp / 8;
 428        } else {
 429                for (i = 0; i < mach_info->num_modes; i++) {
 430                        const struct fb_videomode *mode;
 431                        int size;
 432
 433                        mode = &mach_info->modes[i];
 434                        size = mode->xres * mode->yres * mach_info->bpp / 8;
 435                        if (size > fb_size)
 436                                fb_size = size;
 437                }
 438        }
 439
 440        return fb_size;
 441}
 442
 443static int __init ep93xxfb_alloc_videomem(struct fb_info *info)
 444{
 445        struct ep93xx_fbi *fbi = info->par;
 446        char __iomem *virt_addr;
 447        dma_addr_t phys_addr;
 448        unsigned int fb_size;
 449
 450        fb_size = ep93xxfb_calc_fbsize(fbi->mach_info);
 451        virt_addr = dma_alloc_writecombine(info->dev, fb_size,
 452                                           &phys_addr, GFP_KERNEL);
 453        if (!virt_addr)
 454                return -ENOMEM;
 455
 456        /*
 457         * There is a bug in the ep93xx framebuffer which causes problems
 458         * if bit 27 of the physical address is set.
 459         * See: http://marc.info/?l=linux-arm-kernel&m=110061245502000&w=2
 460         * There does not seem to be any official errata for this, but I
 461         * have confirmed the problem exists on my hardware (ep9315) at
 462         * least.
 463         */
 464        if (check_screenpage_bug && phys_addr & (1 << 27)) {
 465                dev_err(info->dev, "ep93xx framebuffer bug. phys addr (0x%x) "
 466                        "has bit 27 set: cannot init framebuffer\n",
 467                        phys_addr);
 468
 469                dma_free_coherent(info->dev, fb_size, virt_addr, phys_addr);
 470                return -ENOMEM;
 471        }
 472
 473        info->fix.smem_start = phys_addr;
 474        info->fix.smem_len = fb_size;
 475        info->screen_base = virt_addr;
 476
 477        return 0;
 478}
 479
 480static void ep93xxfb_dealloc_videomem(struct fb_info *info)
 481{
 482        if (info->screen_base)
 483                dma_free_coherent(info->dev, info->fix.smem_len,
 484                                  info->screen_base, info->fix.smem_start);
 485}
 486
 487static int __devinit ep93xxfb_probe(struct platform_device *pdev)
 488{
 489        struct ep93xxfb_mach_info *mach_info = pdev->dev.platform_data;
 490        struct fb_info *info;
 491        struct ep93xx_fbi *fbi;
 492        struct resource *res;
 493        char *video_mode;
 494        int err;
 495
 496        if (!mach_info)
 497                return -EINVAL;
 498
 499        info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev);
 500        if (!info)
 501                return -ENOMEM;
 502
 503        info->dev = &pdev->dev;
 504        platform_set_drvdata(pdev, info);
 505        fbi = info->par;
 506        fbi->mach_info = mach_info;
 507
 508        err = fb_alloc_cmap(&info->cmap, 256, 0);
 509        if (err)
 510                goto failed_cmap;
 511
 512        err = ep93xxfb_alloc_videomem(info);
 513        if (err)
 514                goto failed_videomem;
 515
 516        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 517        if (!res) {
 518                err = -ENXIO;
 519                goto failed_resource;
 520        }
 521
 522        /*
 523         * FIXME - We don't do a request_mem_region here because we are
 524         * sharing the register space with the backlight driver (see
 525         * drivers/video/backlight/ep93xx_bl.c) and doing so will cause
 526         * the second loaded driver to return -EBUSY.
 527         *
 528         * NOTE: No locking is required; the backlight does not touch
 529         * any of the framebuffer registers.
 530         */
 531        fbi->res = res;
 532        fbi->mmio_base = ioremap(res->start, resource_size(res));
 533        if (!fbi->mmio_base) {
 534                err = -ENXIO;
 535                goto failed_resource;
 536        }
 537
 538        strcpy(info->fix.id, pdev->name);
 539        info->fbops             = &ep93xxfb_ops;
 540        info->fix.type          = FB_TYPE_PACKED_PIXELS;
 541        info->fix.accel         = FB_ACCEL_NONE;
 542        info->var.activate      = FB_ACTIVATE_NOW;
 543        info->var.vmode         = FB_VMODE_NONINTERLACED;
 544        info->flags             = FBINFO_DEFAULT;
 545        info->node              = -1;
 546        info->state             = FBINFO_STATE_RUNNING;
 547        info->pseudo_palette    = &fbi->pseudo_palette;
 548
 549        fb_get_options("ep93xx-fb", &video_mode);
 550        err = fb_find_mode(&info->var, info, video_mode,
 551                           fbi->mach_info->modes, fbi->mach_info->num_modes,
 552                           fbi->mach_info->default_mode, fbi->mach_info->bpp);
 553        if (err == 0) {
 554                dev_err(info->dev, "No suitable video mode found\n");
 555                err = -EINVAL;
 556                goto failed_mode;
 557        }
 558
 559        if (mach_info->setup) {
 560                err = mach_info->setup(pdev);
 561                if (err)
 562                        goto failed_mode;
 563        }
 564
 565        err = ep93xxfb_check_var(&info->var, info);
 566        if (err)
 567                goto failed_check;
 568
 569        fbi->clk = clk_get(info->dev, NULL);
 570        if (IS_ERR(fbi->clk)) {
 571                err = PTR_ERR(fbi->clk);
 572                fbi->clk = NULL;
 573                goto failed_check;
 574        }
 575
 576        ep93xxfb_set_par(info);
 577        clk_enable(fbi->clk);
 578
 579        err = register_framebuffer(info);
 580        if (err)
 581                goto failed;
 582
 583        dev_info(info->dev, "registered. Mode = %dx%d-%d\n",
 584                 info->var.xres, info->var.yres, info->var.bits_per_pixel);
 585        return 0;
 586
 587failed:
 588        clk_put(fbi->clk);
 589failed_check:
 590        if (fbi->mach_info->teardown)
 591                fbi->mach_info->teardown(pdev);
 592failed_mode:
 593        iounmap(fbi->mmio_base);
 594failed_resource:
 595        ep93xxfb_dealloc_videomem(info);
 596failed_videomem:
 597        fb_dealloc_cmap(&info->cmap);
 598failed_cmap:
 599        kfree(info);
 600        platform_set_drvdata(pdev, NULL);
 601
 602        return err;
 603}
 604
 605static int __devexit ep93xxfb_remove(struct platform_device *pdev)
 606{
 607        struct fb_info *info = platform_get_drvdata(pdev);
 608        struct ep93xx_fbi *fbi = info->par;
 609
 610        unregister_framebuffer(info);
 611        clk_disable(fbi->clk);
 612        clk_put(fbi->clk);
 613        iounmap(fbi->mmio_base);
 614        ep93xxfb_dealloc_videomem(info);
 615        fb_dealloc_cmap(&info->cmap);
 616
 617        if (fbi->mach_info->teardown)
 618                fbi->mach_info->teardown(pdev);
 619
 620        kfree(info);
 621        platform_set_drvdata(pdev, NULL);
 622
 623        return 0;
 624}
 625
 626static struct platform_driver ep93xxfb_driver = {
 627        .probe          = ep93xxfb_probe,
 628        .remove         = __devexit_p(ep93xxfb_remove),
 629        .driver = {
 630                .name   = "ep93xx-fb",
 631                .owner  = THIS_MODULE,
 632        },
 633};
 634
 635static int __devinit ep93xxfb_init(void)
 636{
 637        return platform_driver_register(&ep93xxfb_driver);
 638}
 639
 640static void __exit ep93xxfb_exit(void)
 641{
 642        platform_driver_unregister(&ep93xxfb_driver);
 643}
 644
 645module_init(ep93xxfb_init);
 646module_exit(ep93xxfb_exit);
 647
 648MODULE_DESCRIPTION("EP93XX Framebuffer Driver");
 649MODULE_ALIAS("platform:ep93xx-fb");
 650MODULE_AUTHOR("Ryan Mallon, "
 651              "H Hartley Sweeten <hsweeten@visionengravers.com");
 652MODULE_LICENSE("GPL");
 653
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