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