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vt8623fb.c

/*
 * linux/drivers/video/vt8623fb.c - fbdev driver for
 * integrated graphic core in VIA VT8623 [CLE266] chipset
 *
 * Copyright (c) 2006-2007 Ondrej Zajicek <santiago@crfreenet.org>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive for
 * more details.
 *
 * Code is based on s3fb, some parts are from David Boucher's viafb
 * (http://davesdomain.org.uk/viafb/)
 */

#include <linux/version.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/svga.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/console.h> /* Why should fb driver call console functions? because acquire_console_sem() */
#include <video/vga.h>

#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif

struct vt8623fb_info {
      char __iomem *mmio_base;
      int mtrr_reg;
      struct vgastate state;
      struct mutex open_lock;
      unsigned int ref_count;
      u32 pseudo_palette[16];
};



/* ------------------------------------------------------------------------- */

static const struct svga_fb_format vt8623fb_formats[] = {
      { 0,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 0,
            FB_TYPE_TEXT, FB_AUX_TEXT_SVGA_STEP8,     FB_VISUAL_PSEUDOCOLOR, 16, 16},
      { 4,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 0,
            FB_TYPE_PACKED_PIXELS, 0,           FB_VISUAL_PSEUDOCOLOR, 16, 16},
      { 4,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 1,
            FB_TYPE_INTERLEAVED_PLANES, 1,            FB_VISUAL_PSEUDOCOLOR, 16, 16},
      { 8,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 0,
            FB_TYPE_PACKED_PIXELS, 0,           FB_VISUAL_PSEUDOCOLOR, 8, 8},
/*    {16,  {10, 5, 0}, {5, 5, 0},  {0, 5, 0}, {0, 0, 0}, 0,
            FB_TYPE_PACKED_PIXELS, 0,           FB_VISUAL_TRUECOLOR, 4, 4},   */
      {16,  {11, 5, 0}, {5, 6, 0},  {0, 5, 0}, {0, 0, 0}, 0,
            FB_TYPE_PACKED_PIXELS, 0,           FB_VISUAL_TRUECOLOR, 4, 4},
      {32,  {16, 8, 0}, {8, 8, 0},  {0, 8, 0}, {0, 0, 0}, 0,
            FB_TYPE_PACKED_PIXELS, 0,           FB_VISUAL_TRUECOLOR, 2, 2},
      SVGA_FORMAT_END
};

static const struct svga_pll vt8623_pll = {2, 127, 2, 7, 0, 3,
      60000, 300000, 14318};

/* CRT timing register sets */

static struct vga_regset vt8623_h_total_regs[]       = {{0x00, 0, 7}, {0x36, 3, 3}, VGA_REGSET_END};
static struct vga_regset vt8623_h_display_regs[]     = {{0x01, 0, 7}, VGA_REGSET_END};
static struct vga_regset vt8623_h_blank_start_regs[] = {{0x02, 0, 7}, VGA_REGSET_END};
static struct vga_regset vt8623_h_blank_end_regs[]   = {{0x03, 0, 4}, {0x05, 7, 7}, {0x33, 5, 5}, VGA_REGSET_END};
static struct vga_regset vt8623_h_sync_start_regs[]  = {{0x04, 0, 7}, {0x33, 4, 4}, VGA_REGSET_END};
static struct vga_regset vt8623_h_sync_end_regs[]    = {{0x05, 0, 4}, VGA_REGSET_END};

static struct vga_regset vt8623_v_total_regs[]       = {{0x06, 0, 7}, {0x07, 0, 0}, {0x07, 5, 5}, {0x35, 0, 0}, VGA_REGSET_END};
static struct vga_regset vt8623_v_display_regs[]     = {{0x12, 0, 7}, {0x07, 1, 1}, {0x07, 6, 6}, {0x35, 2, 2}, VGA_REGSET_END};
static struct vga_regset vt8623_v_blank_start_regs[] = {{0x15, 0, 7}, {0x07, 3, 3}, {0x09, 5, 5}, {0x35, 3, 3}, VGA_REGSET_END};
static struct vga_regset vt8623_v_blank_end_regs[]   = {{0x16, 0, 7}, VGA_REGSET_END};
static struct vga_regset vt8623_v_sync_start_regs[]  = {{0x10, 0, 7}, {0x07, 2, 2}, {0x07, 7, 7}, {0x35, 1, 1}, VGA_REGSET_END};
static struct vga_regset vt8623_v_sync_end_regs[]    = {{0x11, 0, 3}, VGA_REGSET_END};

static struct vga_regset vt8623_offset_regs[]        = {{0x13, 0, 7}, {0x35, 5, 7}, VGA_REGSET_END};
static struct vga_regset vt8623_line_compare_regs[]  = {{0x18, 0, 7}, {0x07, 4, 4}, {0x09, 6, 6}, {0x33, 0, 2}, {0x35, 4, 4}, VGA_REGSET_END};
static struct vga_regset vt8623_fetch_count_regs[]   = {{0x1C, 0, 7}, {0x1D, 0, 1}, VGA_REGSET_END};
static struct vga_regset vt8623_start_address_regs[] = {{0x0d, 0, 7}, {0x0c, 0, 7}, {0x34, 0, 7}, {0x48, 0, 1}, VGA_REGSET_END};

static struct svga_timing_regs vt8623_timing_regs     = {
      vt8623_h_total_regs, vt8623_h_display_regs, vt8623_h_blank_start_regs,
      vt8623_h_blank_end_regs, vt8623_h_sync_start_regs, vt8623_h_sync_end_regs,
      vt8623_v_total_regs, vt8623_v_display_regs, vt8623_v_blank_start_regs,
      vt8623_v_blank_end_regs, vt8623_v_sync_start_regs, vt8623_v_sync_end_regs,
};


/* ------------------------------------------------------------------------- */


/* Module parameters */

static char *mode = "640x480-8@60";

#ifdef CONFIG_MTRR
static int mtrr = 1;
#endif

MODULE_AUTHOR("(c) 2006 Ondrej Zajicek <santiago@crfreenet.org>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("fbdev driver for integrated graphics core in VIA VT8623 [CLE266]");

module_param(mode, charp, 0644);
MODULE_PARM_DESC(mode, "Default video mode ('640x480-8@60', etc)");

#ifdef CONFIG_MTRR
module_param(mtrr, int, 0444);
MODULE_PARM_DESC(mtrr, "Enable write-combining with MTRR (1=enable, 0=disable, default=1)");
#endif


/* ------------------------------------------------------------------------- */


static struct fb_tile_ops vt8623fb_tile_ops = {
      .fb_settile = svga_settile,
      .fb_tilecopy      = svga_tilecopy,
      .fb_tilefill    = svga_tilefill,
      .fb_tileblit    = svga_tileblit,
      .fb_tilecursor  = svga_tilecursor,
      .fb_get_tilemax = svga_get_tilemax,
};


/* ------------------------------------------------------------------------- */


/* image data is MSB-first, fb structure is MSB-first too */
static inline u32 expand_color(u32 c)
{
      return ((c & 1) | ((c & 2) << 7) | ((c & 4) << 14) | ((c & 8) << 21)) * 0xFF;
}

/* vt8623fb_iplan_imageblit silently assumes that almost everything is 8-pixel aligned */
static void vt8623fb_iplan_imageblit(struct fb_info *info, const struct fb_image *image)
{
      u32 fg = expand_color(image->fg_color);
      u32 bg = expand_color(image->bg_color);
      const u8 *src1, *src;
      u8 __iomem *dst1;
      u32 __iomem *dst;
      u32 val;
      int x, y;

      src1 = image->data;
      dst1 = info->screen_base + (image->dy * info->fix.line_length)
             + ((image->dx / 8) * 4);

      for (y = 0; y < image->height; y++) {
            src = src1;
            dst = (u32 __iomem *) dst1;
            for (x = 0; x < image->width; x += 8) {
                  val = *(src++) * 0x01010101;
                  val = (val & fg) | (~val & bg);
                  fb_writel(val, dst++);
            }
            src1 += image->width / 8;
            dst1 += info->fix.line_length;
      }
}

/* vt8623fb_iplan_fillrect silently assumes that almost everything is 8-pixel aligned */
static void vt8623fb_iplan_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
      u32 fg = expand_color(rect->color);
      u8 __iomem *dst1;
      u32 __iomem *dst;
      int x, y;

      dst1 = info->screen_base + (rect->dy * info->fix.line_length)
             + ((rect->dx / 8) * 4);

      for (y = 0; y < rect->height; y++) {
            dst = (u32 __iomem *) dst1;
            for (x = 0; x < rect->width; x += 8) {
                  fb_writel(fg, dst++);
            }
            dst1 += info->fix.line_length;
      }
}


/* image data is MSB-first, fb structure is high-nibble-in-low-byte-first */
static inline u32 expand_pixel(u32 c)
{
      return (((c &  1) << 24) | ((c &  2) << 27) | ((c &  4) << 14) | ((c &   8) << 17) |
            ((c & 16) <<  4) | ((c & 32) <<  7) | ((c & 64) >>  6) | ((c & 128) >>  3)) * 0xF;
}

/* vt8623fb_cfb4_imageblit silently assumes that almost everything is 8-pixel aligned */
static void vt8623fb_cfb4_imageblit(struct fb_info *info, const struct fb_image *image)
{
      u32 fg = image->fg_color * 0x11111111;
      u32 bg = image->bg_color * 0x11111111;
      const u8 *src1, *src;
      u8 __iomem *dst1;
      u32 __iomem *dst;
      u32 val;
      int x, y;

      src1 = image->data;
      dst1 = info->screen_base + (image->dy * info->fix.line_length)
             + ((image->dx / 8) * 4);

      for (y = 0; y < image->height; y++) {
            src = src1;
            dst = (u32 __iomem *) dst1;
            for (x = 0; x < image->width; x += 8) {
                  val = expand_pixel(*(src++));
                  val = (val & fg) | (~val & bg);
                  fb_writel(val, dst++);
            }
            src1 += image->width / 8;
            dst1 += info->fix.line_length;
      }
}

static void vt8623fb_imageblit(struct fb_info *info, const struct fb_image *image)
{
      if ((info->var.bits_per_pixel == 4) && (image->depth == 1)
          && ((image->width % 8) == 0) && ((image->dx % 8) == 0)) {
            if (info->fix.type == FB_TYPE_INTERLEAVED_PLANES)
                  vt8623fb_iplan_imageblit(info, image);
            else
                  vt8623fb_cfb4_imageblit(info, image);
      } else
            cfb_imageblit(info, image);
}

static void vt8623fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
      if ((info->var.bits_per_pixel == 4)
          && ((rect->width % 8) == 0) && ((rect->dx % 8) == 0)
          && (info->fix.type == FB_TYPE_INTERLEAVED_PLANES))
            vt8623fb_iplan_fillrect(info, rect);
       else
            cfb_fillrect(info, rect);
}


/* ------------------------------------------------------------------------- */


static void vt8623_set_pixclock(struct fb_info *info, u32 pixclock)
{
      u16 m, n, r;
      u8 regval;
      int rv;

      rv = svga_compute_pll(&vt8623_pll, 1000000000 / pixclock, &m, &n, &r, info->node);
      if (rv < 0) {
            printk(KERN_ERR "fb%d: cannot set requested pixclock, keeping old value\n", info->node);
            return;
      }

      /* Set VGA misc register  */
      regval = vga_r(NULL, VGA_MIS_R);
      vga_w(NULL, VGA_MIS_W, regval | VGA_MIS_ENB_PLL_LOAD);

      /* Set clock registers */
      vga_wseq(NULL, 0x46, (n  | (r << 6)));
      vga_wseq(NULL, 0x47, m);

      udelay(1000);

      /* PLL reset */
      svga_wseq_mask(0x40, 0x02, 0x02);
      svga_wseq_mask(0x40, 0x00, 0x02);
}


static int vt8623fb_open(struct fb_info *info, int user)
{
      struct vt8623fb_info *par = info->par;

      mutex_lock(&(par->open_lock));
      if (par->ref_count == 0) {
            memset(&(par->state), 0, sizeof(struct vgastate));
            par->state.flags = VGA_SAVE_MODE | VGA_SAVE_FONTS | VGA_SAVE_CMAP;
            par->state.num_crtc = 0xA2;
            par->state.num_seq = 0x50;
            save_vga(&(par->state));
      }

      par->ref_count++;
      mutex_unlock(&(par->open_lock));

      return 0;
}

static int vt8623fb_release(struct fb_info *info, int user)
{
      struct vt8623fb_info *par = info->par;

      mutex_lock(&(par->open_lock));
      if (par->ref_count == 0) {
            mutex_unlock(&(par->open_lock));
            return -EINVAL;
      }

      if (par->ref_count == 1)
            restore_vga(&(par->state));

      par->ref_count--;
      mutex_unlock(&(par->open_lock));

      return 0;
}

static int vt8623fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
      int rv, mem, step;

      /* Find appropriate format */
      rv = svga_match_format (vt8623fb_formats, var, NULL);
      if (rv < 0)
      {
            printk(KERN_ERR "fb%d: unsupported mode requested\n", info->node);
            return rv;
      }

      /* Do not allow to have real resoulution larger than virtual */
      if (var->xres > var->xres_virtual)
            var->xres_virtual = var->xres;

      if (var->yres > var->yres_virtual)
            var->yres_virtual = var->yres;

      /* Round up xres_virtual to have proper alignment of lines */
      step = vt8623fb_formats[rv].xresstep - 1;
      var->xres_virtual = (var->xres_virtual+step) & ~step;

      /* Check whether have enough memory */
      mem = ((var->bits_per_pixel * var->xres_virtual) >> 3) * var->yres_virtual;
      if (mem > info->screen_size)
      {
            printk(KERN_ERR "fb%d: not enough framebuffer memory (%d kB requested , %d kB available)\n", info->node, mem >> 10, (unsigned int) (info->screen_size >> 10));
            return -EINVAL;
      }

      /* Text mode is limited to 256 kB of memory */
      if ((var->bits_per_pixel == 0) && (mem > (256*1024)))
      {
            printk(KERN_ERR "fb%d: text framebuffer size too large (%d kB requested, 256 kB possible)\n", info->node, mem >> 10);
            return -EINVAL;
      }

      rv = svga_check_timings (&vt8623_timing_regs, var, info->node);
      if (rv < 0)
      {
            printk(KERN_ERR "fb%d: invalid timings requested\n", info->node);
            return rv;
      }

      /* Interlaced mode not supported */
      if (var->vmode & FB_VMODE_INTERLACED)
            return -EINVAL;

      return 0;
}


static int vt8623fb_set_par(struct fb_info *info)
{
      u32 mode, offset_value, fetch_value, screen_size;
      u32 bpp = info->var.bits_per_pixel;

      if (bpp != 0) {
            info->fix.ypanstep = 1;
            info->fix.line_length = (info->var.xres_virtual * bpp) / 8;

            info->flags &= ~FBINFO_MISC_TILEBLITTING;
            info->tileops = NULL;

            /* in 4bpp supports 8p wide tiles only, any tiles otherwise */
            info->pixmap.blit_x = (bpp == 4) ? (1 << (8 - 1)) : (~(u32)0);
            info->pixmap.blit_y = ~(u32)0;

            offset_value = (info->var.xres_virtual * bpp) / 64;
            fetch_value  = ((info->var.xres * bpp) / 128) + 4;

            if (bpp == 4)
                  fetch_value  = (info->var.xres / 8) + 8; /* + 0 is OK */

            screen_size  = info->var.yres_virtual * info->fix.line_length;
      } else {
            info->fix.ypanstep = 16;
            info->fix.line_length = 0;

            info->flags |= FBINFO_MISC_TILEBLITTING;
            info->tileops = &vt8623fb_tile_ops;

            /* supports 8x16 tiles only */
            info->pixmap.blit_x = 1 << (8 - 1);
            info->pixmap.blit_y = 1 << (16 - 1);

            offset_value = info->var.xres_virtual / 16;
            fetch_value  = (info->var.xres / 8) + 8;
            screen_size  = (info->var.xres_virtual * info->var.yres_virtual) / 64;
      }

      info->var.xoffset = 0;
      info->var.yoffset = 0;
      info->var.activate = FB_ACTIVATE_NOW;

      /* Unlock registers */
      svga_wseq_mask(0x10, 0x01, 0x01);
      svga_wcrt_mask(0x11, 0x00, 0x80);
      svga_wcrt_mask(0x47, 0x00, 0x01);

      /* Device, screen and sync off */
      svga_wseq_mask(0x01, 0x20, 0x20);
      svga_wcrt_mask(0x36, 0x30, 0x30);
      svga_wcrt_mask(0x17, 0x00, 0x80);

      /* Set default values */
      svga_set_default_gfx_regs();
      svga_set_default_atc_regs();
      svga_set_default_seq_regs();
      svga_set_default_crt_regs();
      svga_wcrt_multi(vt8623_line_compare_regs, 0xFFFFFFFF);
      svga_wcrt_multi(vt8623_start_address_regs, 0);

      svga_wcrt_multi(vt8623_offset_regs, offset_value);
      svga_wseq_multi(vt8623_fetch_count_regs, fetch_value);

      if (info->var.vmode & FB_VMODE_DOUBLE)
            svga_wcrt_mask(0x09, 0x80, 0x80);
      else
            svga_wcrt_mask(0x09, 0x00, 0x80);

      svga_wseq_mask(0x1E, 0xF0, 0xF0); // DI/DVP bus
      svga_wseq_mask(0x2A, 0x0F, 0x0F); // DI/DVP bus
      svga_wseq_mask(0x16, 0x08, 0xBF); // FIFO read treshold
      vga_wseq(NULL, 0x17, 0x1F);       // FIFO depth
      vga_wseq(NULL, 0x18, 0x4E);
      svga_wseq_mask(0x1A, 0x08, 0x08); // enable MMIO ?

      vga_wcrt(NULL, 0x32, 0x00);
      vga_wcrt(NULL, 0x34, 0x00);
      vga_wcrt(NULL, 0x6A, 0x80);
      vga_wcrt(NULL, 0x6A, 0xC0);

      vga_wgfx(NULL, 0x20, 0x00);
      vga_wgfx(NULL, 0x21, 0x00);
      vga_wgfx(NULL, 0x22, 0x00);

      /* Set SR15 according to number of bits per pixel */
      mode = svga_match_format(vt8623fb_formats, &(info->var), &(info->fix));
      switch (mode) {
      case 0:
            pr_debug("fb%d: text mode\n", info->node);
            svga_set_textmode_vga_regs();
            svga_wseq_mask(0x15, 0x00, 0xFE);
            svga_wcrt_mask(0x11, 0x60, 0x70);
            break;
      case 1:
            pr_debug("fb%d: 4 bit pseudocolor\n", info->node);
            vga_wgfx(NULL, VGA_GFX_MODE, 0x40);
            svga_wseq_mask(0x15, 0x20, 0xFE);
            svga_wcrt_mask(0x11, 0x00, 0x70);
            break;
      case 2:
            pr_debug("fb%d: 4 bit pseudocolor, planar\n", info->node);
            svga_wseq_mask(0x15, 0x00, 0xFE);
            svga_wcrt_mask(0x11, 0x00, 0x70);
            break;
      case 3:
            pr_debug("fb%d: 8 bit pseudocolor\n", info->node);
            svga_wseq_mask(0x15, 0x22, 0xFE);
            break;
      case 4:
            pr_debug("fb%d: 5/6/5 truecolor\n", info->node);
            svga_wseq_mask(0x15, 0xB6, 0xFE);
            break;
      case 5:
            pr_debug("fb%d: 8/8/8 truecolor\n", info->node);
            svga_wseq_mask(0x15, 0xAE, 0xFE);
            break;
      default:
            printk(KERN_ERR "vt8623fb: unsupported mode - bug\n");
            return (-EINVAL);
      }

      vt8623_set_pixclock(info, info->var.pixclock);
      svga_set_timings(&vt8623_timing_regs, &(info->var), 1, 1,
                   (info->var.vmode & FB_VMODE_DOUBLE) ? 2 : 1, 1,
                   1, info->node);

      memset_io(info->screen_base, 0x00, screen_size);

      /* Device and screen back on */
      svga_wcrt_mask(0x17, 0x80, 0x80);
      svga_wcrt_mask(0x36, 0x00, 0x30);
      svga_wseq_mask(0x01, 0x00, 0x20);

      return 0;
}


static int vt8623fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                        u_int transp, struct fb_info *fb)
{
      switch (fb->var.bits_per_pixel) {
      case 0:
      case 4:
            if (regno >= 16)
                  return -EINVAL;

            outb(0x0F, VGA_PEL_MSK);
            outb(regno, VGA_PEL_IW);
            outb(red >> 10, VGA_PEL_D);
            outb(green >> 10, VGA_PEL_D);
            outb(blue >> 10, VGA_PEL_D);
            break;
      case 8:
            if (regno >= 256)
                  return -EINVAL;

            outb(0xFF, VGA_PEL_MSK);
            outb(regno, VGA_PEL_IW);
            outb(red >> 10, VGA_PEL_D);
            outb(green >> 10, VGA_PEL_D);
            outb(blue >> 10, VGA_PEL_D);
            break;
      case 16:
            if (regno >= 16)
                  return 0;

            if (fb->var.green.length == 5)
                  ((u32*)fb->pseudo_palette)[regno] = ((red & 0xF800) >> 1) |
                        ((green & 0xF800) >> 6) | ((blue & 0xF800) >> 11);
            else if (fb->var.green.length == 6)
                  ((u32*)fb->pseudo_palette)[regno] = (red & 0xF800) |
                        ((green & 0xFC00) >> 5) | ((blue & 0xF800) >> 11);
            else
                  return -EINVAL;
            break;
      case 24:
      case 32:
            if (regno >= 16)
                  return 0;

            /* ((transp & 0xFF00) << 16) */
            ((u32*)fb->pseudo_palette)[regno] = ((red & 0xFF00) << 8) |
                  (green & 0xFF00) | ((blue & 0xFF00) >> 8);
            break;
      default:
            return -EINVAL;
      }

      return 0;
}


static int vt8623fb_blank(int blank_mode, struct fb_info *info)
{
      switch (blank_mode) {
      case FB_BLANK_UNBLANK:
            pr_debug("fb%d: unblank\n", info->node);
            svga_wcrt_mask(0x36, 0x00, 0x30);
            svga_wseq_mask(0x01, 0x00, 0x20);
            break;
      case FB_BLANK_NORMAL:
            pr_debug("fb%d: blank\n", info->node);
            svga_wcrt_mask(0x36, 0x00, 0x30);
            svga_wseq_mask(0x01, 0x20, 0x20);
            break;
      case FB_BLANK_HSYNC_SUSPEND:
            pr_debug("fb%d: DPMS standby (hsync off)\n", info->node);
            svga_wcrt_mask(0x36, 0x10, 0x30);
            svga_wseq_mask(0x01, 0x20, 0x20);
            break;
      case FB_BLANK_VSYNC_SUSPEND:
            pr_debug("fb%d: DPMS suspend (vsync off)\n", info->node);
            svga_wcrt_mask(0x36, 0x20, 0x30);
            svga_wseq_mask(0x01, 0x20, 0x20);
            break;
      case FB_BLANK_POWERDOWN:
            pr_debug("fb%d: DPMS off (no sync)\n", info->node);
            svga_wcrt_mask(0x36, 0x30, 0x30);
            svga_wseq_mask(0x01, 0x20, 0x20);
            break;
      }

      return 0;
}


static int vt8623fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
{
      unsigned int offset;

      /* Calculate the offset */
      if (var->bits_per_pixel == 0) {
            offset = (var->yoffset / 16) * var->xres_virtual + var->xoffset;
            offset = offset >> 3;
      } else {
            offset = (var->yoffset * info->fix.line_length) +
                   (var->xoffset * var->bits_per_pixel / 8);
            offset = offset >> ((var->bits_per_pixel == 4) ? 2 : 1);
      }

      /* Set the offset */
      svga_wcrt_multi(vt8623_start_address_regs, offset);

      return 0;
}


/* ------------------------------------------------------------------------- */


/* Frame buffer operations */

static struct fb_ops vt8623fb_ops = {
      .owner            = THIS_MODULE,
      .fb_open    = vt8623fb_open,
      .fb_release = vt8623fb_release,
      .fb_check_var     = vt8623fb_check_var,
      .fb_set_par = vt8623fb_set_par,
      .fb_setcolreg     = vt8623fb_setcolreg,
      .fb_blank   = vt8623fb_blank,
      .fb_pan_display   = vt8623fb_pan_display,
      .fb_fillrect      = vt8623fb_fillrect,
      .fb_copyarea      = cfb_copyarea,
      .fb_imageblit     = vt8623fb_imageblit,
      .fb_get_caps    = svga_get_caps,
};


/* PCI probe */

static int __devinit vt8623_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
      struct fb_info *info;
      struct vt8623fb_info *par;
      unsigned int memsize1, memsize2;
      int rc;

      /* Ignore secondary VGA device because there is no VGA arbitration */
      if (! svga_primary_device(dev)) {
            dev_info(&(dev->dev), "ignoring secondary device\n");
            return -ENODEV;
      }

      /* Allocate and fill driver data structure */
      info = framebuffer_alloc(sizeof(struct vt8623fb_info), NULL);
      if (! info) {
            dev_err(&(dev->dev), "cannot allocate memory\n");
            return -ENOMEM;
      }

      par = info->par;
      mutex_init(&par->open_lock);

      info->flags = FBINFO_PARTIAL_PAN_OK | FBINFO_HWACCEL_YPAN;
      info->fbops = &vt8623fb_ops;

      /* Prepare PCI device */

      rc = pci_enable_device(dev);
      if (rc < 0) {
            dev_err(&(dev->dev), "cannot enable PCI device\n");
            goto err_enable_device;
      }

      rc = pci_request_regions(dev, "vt8623fb");
      if (rc < 0) {
            dev_err(&(dev->dev), "cannot reserve framebuffer region\n");
            goto err_request_regions;
      }

      info->fix.smem_start = pci_resource_start(dev, 0);
      info->fix.smem_len = pci_resource_len(dev, 0);
      info->fix.mmio_start = pci_resource_start(dev, 1);
      info->fix.mmio_len = pci_resource_len(dev, 1);

      /* Map physical IO memory address into kernel space */
      info->screen_base = pci_iomap(dev, 0, 0);
      if (! info->screen_base) {
            rc = -ENOMEM;
            dev_err(&(dev->dev), "iomap for framebuffer failed\n");
            goto err_iomap_1;
      }

      par->mmio_base = pci_iomap(dev, 1, 0);
      if (! par->mmio_base) {
            rc = -ENOMEM;
            dev_err(&(dev->dev), "iomap for MMIO failed\n");
            goto err_iomap_2;
      }

      /* Find how many physical memory there is on card */
      memsize1 = (vga_rseq(NULL, 0x34) + 1) >> 1;
      memsize2 = vga_rseq(NULL, 0x39) << 2;

      if ((16 <= memsize1) && (memsize1 <= 64) && (memsize1 == memsize2))
            info->screen_size = memsize1 << 20;
      else {
            dev_err(&(dev->dev), "memory size detection failed (%x %x), suppose 16 MB\n", memsize1, memsize2);
            info->screen_size = 16 << 20;
      }

      info->fix.smem_len = info->screen_size;
      strcpy(info->fix.id, "VIA VT8623");
      info->fix.type = FB_TYPE_PACKED_PIXELS;
      info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
      info->fix.ypanstep = 0;
      info->fix.accel = FB_ACCEL_NONE;
      info->pseudo_palette = (void*)par->pseudo_palette;

      /* Prepare startup mode */

      rc = fb_find_mode(&(info->var), info, mode, NULL, 0, NULL, 8);
      if (! ((rc == 1) || (rc == 2))) {
            rc = -EINVAL;
            dev_err(&(dev->dev), "mode %s not found\n", mode);
            goto err_find_mode;
      }

      rc = fb_alloc_cmap(&info->cmap, 256, 0);
      if (rc < 0) {
            dev_err(&(dev->dev), "cannot allocate colormap\n");
            goto err_alloc_cmap;
      }

      rc = register_framebuffer(info);
      if (rc < 0) {
            dev_err(&(dev->dev), "cannot register framebugger\n");
            goto err_reg_fb;
      }

      printk(KERN_INFO "fb%d: %s on %s, %d MB RAM\n", info->node, info->fix.id,
             pci_name(dev), info->fix.smem_len >> 20);

      /* Record a reference to the driver data */
      pci_set_drvdata(dev, info);

#ifdef CONFIG_MTRR
      if (mtrr) {
            par->mtrr_reg = -1;
            par->mtrr_reg = mtrr_add(info->fix.smem_start, info->fix.smem_len, MTRR_TYPE_WRCOMB, 1);
      }
#endif

      return 0;

      /* Error handling */
err_reg_fb:
      fb_dealloc_cmap(&info->cmap);
err_alloc_cmap:
err_find_mode:
      pci_iounmap(dev, par->mmio_base);
err_iomap_2:
      pci_iounmap(dev, info->screen_base);
err_iomap_1:
      pci_release_regions(dev);
err_request_regions:
/*    pci_disable_device(dev); */
err_enable_device:
      framebuffer_release(info);
      return rc;
}

/* PCI remove */

static void __devexit vt8623_pci_remove(struct pci_dev *dev)
{
      struct fb_info *info = pci_get_drvdata(dev);

      if (info) {
            struct vt8623fb_info *par = info->par;

#ifdef CONFIG_MTRR
            if (par->mtrr_reg >= 0) {
                  mtrr_del(par->mtrr_reg, 0, 0);
                  par->mtrr_reg = -1;
            }
#endif

            unregister_framebuffer(info);
            fb_dealloc_cmap(&info->cmap);

            pci_iounmap(dev, info->screen_base);
            pci_iounmap(dev, par->mmio_base);
            pci_release_regions(dev);
/*          pci_disable_device(dev); */

            pci_set_drvdata(dev, NULL);
            framebuffer_release(info);
      }
}


#ifdef CONFIG_PM
/* PCI suspend */

static int vt8623_pci_suspend(struct pci_dev* dev, pm_message_t state)
{
      struct fb_info *info = pci_get_drvdata(dev);
      struct vt8623fb_info *par = info->par;

      dev_info(&(dev->dev), "suspend\n");

      acquire_console_sem();
      mutex_lock(&(par->open_lock));

      if ((state.event == PM_EVENT_FREEZE) || (par->ref_count == 0)) {
            mutex_unlock(&(par->open_lock));
            release_console_sem();
            return 0;
      }

      fb_set_suspend(info, 1);

      pci_save_state(dev);
      pci_disable_device(dev);
      pci_set_power_state(dev, pci_choose_state(dev, state));

      mutex_unlock(&(par->open_lock));
      release_console_sem();

      return 0;
}


/* PCI resume */

static int vt8623_pci_resume(struct pci_dev* dev)
{
      struct fb_info *info = pci_get_drvdata(dev);
      struct vt8623fb_info *par = info->par;

      dev_info(&(dev->dev), "resume\n");

      acquire_console_sem();
      mutex_lock(&(par->open_lock));

      if (par->ref_count == 0) {
            mutex_unlock(&(par->open_lock));
            release_console_sem();
            return 0;
      }

      pci_set_power_state(dev, PCI_D0);
      pci_restore_state(dev);

      if (pci_enable_device(dev))
            goto fail;

      pci_set_master(dev);

      vt8623fb_set_par(info);
      fb_set_suspend(info, 0);

      mutex_unlock(&(par->open_lock));
fail:
      release_console_sem();

      return 0;
}
#else
#define vt8623_pci_suspend NULL
#define vt8623_pci_resume NULL
#endif /* CONFIG_PM */

/* List of boards that we are trying to support */

static struct pci_device_id vt8623_devices[] __devinitdata = {
      {PCI_DEVICE(PCI_VENDOR_ID_VIA, 0x3122)},
      {0, 0, 0, 0, 0, 0, 0}
};

MODULE_DEVICE_TABLE(pci, vt8623_devices);

static struct pci_driver vt8623fb_pci_driver = {
      .name       = "vt8623fb",
      .id_table   = vt8623_devices,
      .probe            = vt8623_pci_probe,
      .remove           = __devexit_p(vt8623_pci_remove),
      .suspend    = vt8623_pci_suspend,
      .resume           = vt8623_pci_resume,
};

/* Cleanup */

static void __exit vt8623fb_cleanup(void)
{
      pr_debug("vt8623fb: cleaning up\n");
      pci_unregister_driver(&vt8623fb_pci_driver);
}

/* Driver Initialisation */

static int __init vt8623fb_init(void)
{

#ifndef MODULE
      char *option = NULL;

      if (fb_get_options("vt8623fb", &option))
            return -ENODEV;

      if (option && *option)
            mode = option;
#endif

      pr_debug("vt8623fb: initializing\n");
      return pci_register_driver(&vt8623fb_pci_driver);
}

/* ------------------------------------------------------------------------- */

/* Modularization */

module_init(vt8623fb_init);
module_exit(vt8623fb_cleanup);

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