SSL i740fb.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* i740fb - framebuffer driver for Intel740
* Copyright (c) 2011 Ondrej Zary
*
* Based on old i740fb driver (c) 2001-2002 Andrey Ulanov <drey@rt.mipt.ru>
* which was partially based on:
*  VGA 16-color framebuffer driver (c) 1999 Ben Pfaff <pfaffben@debian.org>
* and Petr Vandrovec <VANDROVE@vc.cvut.cz>
*  i740 driver from XFree86 (c) 1998-1999 Precision Insight, Inc., Cedar Park,
* Texas.
*  i740fb by Patrick LERDA, v0.9
*/

#include <linux/aperture.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/console.h>
#include <video/vga.h>

#include "i740_reg.h"

static char *mode_option;
static int mtrr = 1;

struct i740fb_par {
unsigned char __iomem *regs;
bool has_sgram;
int wc_cookie;
bool ddc_registered;
struct i2c_adapter ddc_adapter;
struct i2c_algo_bit_data ddc_algo;
u32 pseudo_palette[16];
struct mutex open_lock;
unsigned int ref_count;

u8 crtc[VGA_CRT_C];
u8 atc[VGA_ATT_C];
u8 gdc[VGA_GFX_C];
u8 seq[VGA_SEQ_C];
u8 misc;
u8 vss;

/* i740 specific registers */
u8 display_cntl;
u8 pixelpipe_cfg0;
u8 pixelpipe_cfg1;
u8 pixelpipe_cfg2;
u8 video_clk2_m;
u8 video_clk2_n;
u8 video_clk2_mn_msbs;
u8 video_clk2_div_sel;
u8 pll_cntl;
u8 address_mapping;
u8 io_cntl;
u8 bitblt_cntl;
u8 ext_vert_total;
u8 ext_vert_disp_end;
u8 ext_vert_sync_start;
u8 ext_vert_blank_start;
u8 ext_horiz_total;
u8 ext_horiz_blank;
u8 ext_offset;
u8 interlace_cntl;
u32 lmi_fifo_watermark;
u8 ext_start_addr;
u8 ext_start_addr_hi;
};

#define DACSPEED8 203
#define DACSPEED16 163
#define DACSPEED24_SG 136
#define DACSPEED24_SD 128
#define DACSPEED32 86

static const struct fb_fix_screeninfo i740fb_fix = {
.id =  "i740fb",
.type =  FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_TRUECOLOR,
.xpanstep = 8,
.ypanstep = 1,
.accel = FB_ACCEL_NONE,
};

static inline void i740outb(struct i740fb_par *par, u16 port, u8 val)
{
vga_mm_w(par->regs, port, val);
}
static inline u8 i740inb(struct i740fb_par *par, u16 port)
{
return vga_mm_r(par->regs, port);
}
static inline void i740outreg(struct i740fb_par *par, u16 port, u8 reg, u8 val)
{
vga_mm_w_fast(par->regs, port, reg, val);
}
static inline u8 i740inreg(struct i740fb_par *par, u16 port, u8 reg)
{
vga_mm_w(par->regs, port, reg);
return vga_mm_r(par->regs, port+1);
}
static inline void i740outreg_mask(struct i740fb_par *par, u16 port, u8 reg,
       u8 val, u8 mask)
{
vga_mm_w_fast(par->regs, port, reg, (val & mask)
  | (i740inreg(par, port, reg) & ~mask));
}

#define REG_DDC_DRIVE 0x62
#define REG_DDC_STATE 0x63
#define DDC_SCL  (1 << 3)
#define DDC_SDA  (1 << 2)

static void i740fb_ddc_setscl(void *data, int val)
{
struct i740fb_par *par = data;

i740outreg_mask(par, XRX, REG_DDC_DRIVE, DDC_SCL, DDC_SCL);
i740outreg_mask(par, XRX, REG_DDC_STATE, val ? DDC_SCL : 0, DDC_SCL);
}

static void i740fb_ddc_setsda(void *data, int val)
{
struct i740fb_par *par = data;

i740outreg_mask(par, XRX, REG_DDC_DRIVE, DDC_SDA, DDC_SDA);
i740outreg_mask(par, XRX, REG_DDC_STATE, val ? DDC_SDA : 0, DDC_SDA);
}

static int i740fb_ddc_getscl(void *data)
{
struct i740fb_par *par = data;

i740outreg_mask(par, XRX, REG_DDC_DRIVE, 0, DDC_SCL);

return !!(i740inreg(par, XRX, REG_DDC_STATE) & DDC_SCL);
}

static int i740fb_ddc_getsda(void *data)
{
struct i740fb_par *par = data;

i740outreg_mask(par, XRX, REG_DDC_DRIVE, 0, DDC_SDA);

return !!(i740inreg(par, XRX, REG_DDC_STATE) & DDC_SDA);
}

static int i740fb_setup_ddc_bus(struct fb_info *info)
{
struct i740fb_par *par = info->par;

strscpy(par->ddc_adapter.name, info->fix.id,
  sizeof(par->ddc_adapter.name));
par->ddc_adapter.owner  = THIS_MODULE;
par->ddc_adapter.algo_data = &par->ddc_algo;
par->ddc_adapter.dev.parent = info->device;
par->ddc_algo.setsda  = i740fb_ddc_setsda;
par->ddc_algo.setscl  = i740fb_ddc_setscl;
par->ddc_algo.getsda  = i740fb_ddc_getsda;
par->ddc_algo.getscl  = i740fb_ddc_getscl;
par->ddc_algo.udelay  = 10;
par->ddc_algo.timeout  = 20;
par->ddc_algo.data  = par;

i2c_set_adapdata(&par->ddc_adapter, par);

return i2c_bit_add_bus(&par->ddc_adapter);
}

static int i740fb_open(struct fb_info *info, int user)
{
struct i740fb_par *par = info->par;

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

return 0;
}

static int i740fb_release(struct fb_info *info, int user)
{
struct i740fb_par *par = info->par;

mutex_lock(&(par->open_lock));
if (par->ref_count == 0) {
  fb_err(info, "release called with zero refcount\n");
  mutex_unlock(&(par->open_lock));
  return -EINVAL;
}

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

return 0;
}

static u32 i740_calc_fifo(struct i740fb_par *par, u32 freq, int bpp)
{
/*
* Would like to calculate these values automatically, but a generic
* algorithm does not seem possible.  Note: These FIFO water mark
* values were tested on several cards and seem to eliminate the
* all of the snow and vertical banding, but fine adjustments will
* probably be required for other cards.
*/

u32 wm;

switch (bpp) {
case 8:
  if (freq > 200)
   wm = 0x18120000;
  else if (freq > 175)
   wm = 0x16110000;
  else if (freq > 135)
   wm = 0x120E0000;
  else
   wm = 0x100D0000;
  break;
case 15:
case 16:
  if (par->has_sgram) {
   if (freq > 140)
    wm = 0x2C1D0000;
   else if (freq > 120)
    wm = 0x2C180000;
   else if (freq > 100)
    wm = 0x24160000;
   else if (freq >  90)
    wm = 0x18120000;
   else if (freq >  50)
    wm = 0x16110000;
   else if (freq >  32)
    wm = 0x13100000;
   else
    wm = 0x120E0000;
  } else {
   if (freq > 160)
    wm = 0x28200000;
   else if (freq > 140)
    wm = 0x2A1E0000;
   else if (freq > 130)
    wm = 0x2B1A0000;
   else if (freq > 120)
    wm = 0x2C180000;
   else if (freq > 100)
    wm = 0x24180000;
   else if (freq >  90)
    wm = 0x18120000;
   else if (freq >  50)
    wm = 0x16110000;
   else if (freq >  32)
    wm = 0x13100000;
   else
    wm = 0x120E0000;
  }
  break;
case 24:
  if (par->has_sgram) {
   if (freq > 130)
    wm = 0x31200000;
   else if (freq > 120)
    wm = 0x2E200000;
   else if (freq > 100)
    wm = 0x2C1D0000;
   else if (freq >  80)
    wm = 0x25180000;
   else if (freq >  64)
    wm = 0x24160000;
   else if (freq >  49)
    wm = 0x18120000;
   else if (freq >  32)
    wm = 0x16110000;
   else
    wm = 0x13100000;
  } else {
   if (freq > 120)
    wm = 0x311F0000;
   else if (freq > 100)
    wm = 0x2C1D0000;
   else if (freq >  80)
    wm = 0x25180000;
   else if (freq >  64)
    wm = 0x24160000;
   else if (freq >  49)
    wm = 0x18120000;
   else if (freq >  32)
    wm = 0x16110000;
   else
    wm = 0x13100000;
  }
  break;
case 32:
  if (par->has_sgram) {
   if (freq >  80)
    wm = 0x2A200000;
   else if (freq >  60)
    wm = 0x281A0000;
   else if (freq >  49)
    wm = 0x25180000;
   else if (freq >  32)
    wm = 0x18120000;
   else
    wm = 0x16110000;
  } else {
   if (freq >  80)
    wm = 0x29200000;
   else if (freq >  60)
    wm = 0x281A0000;
   else if (freq >  49)
    wm = 0x25180000;
   else if (freq >  32)
    wm = 0x18120000;
   else
    wm = 0x16110000;
  }
  break;
}

return wm;
}

/* clock calculation from i740fb by Patrick LERDA */

#define I740_RFREQ  1000000
#define TARGET_MAX_N  30
#define I740_FFIX  (1 << 8)
#define I740_RFREQ_FIX  (I740_RFREQ / I740_FFIX)
#define I740_REF_FREQ  (6667 * I740_FFIX / 100) /* 66.67 MHz */
#define I740_MAX_VCO_FREQ (450 * I740_FFIX)  /* 450 MHz */

static void i740_calc_vclk(u32 freq, struct i740fb_par *par)
{
const u32 err_max    = freq / (200  * I740_RFREQ / I740_FFIX);
const u32 err_target = freq / (1000 * I740_RFREQ / I740_FFIX);
u32 err_best = 512 * I740_FFIX;
u32 f_err, f_vco;
int m_best = 0, n_best = 0, p_best = 0;
int m, n;

p_best = min(15, ilog2(I740_MAX_VCO_FREQ / (freq / I740_RFREQ_FIX)));
f_vco = (freq * (1 << p_best)) / I740_RFREQ_FIX;
freq = freq / I740_RFREQ_FIX;

n = 2;
do {
  n++;
  m = ((f_vco * n) / I740_REF_FREQ + 2) / 4;

  if (m < 3)
   m = 3;

  {
   u32 f_out = (((m * I740_REF_FREQ * 4)
     / n) + ((1 << p_best) / 2)) / (1 << p_best);

   f_err = (freq - f_out);

   if (abs(f_err) < err_max) {
    m_best = m;
    n_best = n;
    err_best = f_err;
   }
  }
} while ((abs(f_err) >= err_target) &&
   ((n <= TARGET_MAX_N) || (abs(err_best) > err_max)));

if (abs(f_err) < err_target) {
  m_best = m;
  n_best = n;
}

par->video_clk2_m = (m_best - 2) & 0xFF;
par->video_clk2_n = (n_best - 2) & 0xFF;
par->video_clk2_mn_msbs = ((((n_best - 2) >> 4) & VCO_N_MSBS)
     | (((m_best - 2) >> 8) & VCO_M_MSBS));
par->video_clk2_div_sel = ((p_best << 4) | REF_DIV_1);
}

static int i740fb_decode_var(const struct fb_var_screeninfo *var,
        struct i740fb_par *par, struct fb_info *info)
{
/*
* Get the video params out of 'var'.
* If a value doesn't fit, round it up, if it's too big, return -EINVAL.
*/

u32 xres, right, hslen, left, xtotal;
u32 yres, lower, vslen, upper, ytotal;
u32 vxres, xoffset, vyres, yoffset;
u32 bpp, base, dacspeed24, mem, freq;
u8 r7;
int i;

dev_dbg(info->device, "decode_var: xres: %i, yres: %i, xres_v: %i, xres_v: %i\n",
    var->xres, var->yres, var->xres_virtual, var->xres_virtual);
dev_dbg(info->device, " xoff: %i, yoff: %i, bpp: %i, graysc: %i\n",
    var->xoffset, var->yoffset, var->bits_per_pixel,
    var->grayscale);
dev_dbg(info->device, " activate: %i, nonstd: %i, vmode: %i\n",
    var->activate, var->nonstd, var->vmode);
dev_dbg(info->device, " pixclock: %i, hsynclen:%i, vsynclen:%i\n",
    var->pixclock, var->hsync_len, var->vsync_len);
dev_dbg(info->device, " left: %i, right: %i, up:%i, lower:%i\n",
    var->left_margin, var->right_margin, var->upper_margin,
    var->lower_margin);

bpp = var->bits_per_pixel;
switch (bpp) {
case 1 ... 8:
  bpp = 8;
  if ((1000000 / var->pixclock) > DACSPEED8) {
   dev_err(info->device, "requested pixclock %i MHz out of range (max. %i MHz at 8bpp)\n",
    1000000 / var->pixclock, DACSPEED8);
   return -EINVAL;
  }
  break;
case 9 ... 15:
  bpp = 15;
  fallthrough;
case 16:
  if ((1000000 / var->pixclock) > DACSPEED16) {
   dev_err(info->device, "requested pixclock %i MHz out of range (max. %i MHz at 15/16bpp)\n",
    1000000 / var->pixclock, DACSPEED16);
   return -EINVAL;
  }
  break;
case 17 ... 24:
  bpp = 24;
  dacspeed24 = par->has_sgram ? DACSPEED24_SG : DACSPEED24_SD;
  if ((1000000 / var->pixclock) > dacspeed24) {
   dev_err(info->device, "requested pixclock %i MHz out of range (max. %i MHz at 24bpp)\n",
    1000000 / var->pixclock, dacspeed24);
   return -EINVAL;
  }
  break;
case 25 ... 32:
  bpp = 32;
  if ((1000000 / var->pixclock) > DACSPEED32) {
   dev_err(info->device, "requested pixclock %i MHz out of range (max. %i MHz at 32bpp)\n",
    1000000 / var->pixclock, DACSPEED32);
   return -EINVAL;
  }
  break;
default:
  return -EINVAL;
}

xres = ALIGN(var->xres, 8);
vxres = ALIGN(var->xres_virtual, 16);
if (vxres < xres)
  vxres = xres;

xoffset = ALIGN(var->xoffset, 8);
if (xres + xoffset > vxres)
  xoffset = vxres - xres;

left = ALIGN(var->left_margin, 8);
right = ALIGN(var->right_margin, 8);
hslen = ALIGN(var->hsync_len, 8);

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

yoffset = var->yoffset;
if (yres + yoffset > vyres)
  yoffset = vyres - yres;

lower = var->lower_margin;
vslen = var->vsync_len;
upper = var->upper_margin;

mem = vxres * vyres * ((bpp + 1) / 8);
if (mem > info->screen_size) {
  dev_err(info->device, "not enough video memory (%d KB requested, %ld KB available)\n",
   mem >> 10, info->screen_size >> 10);
  return -ENOMEM;
}

if (yoffset + yres > vyres)
  yoffset = vyres - yres;

xtotal = xres + right + hslen + left;
ytotal = yres + lower + vslen + upper;

par->crtc[VGA_CRTC_H_TOTAL] = (xtotal >> 3) - 5;
par->crtc[VGA_CRTC_H_DISP] = (xres >> 3) - 1;
par->crtc[VGA_CRTC_H_BLANK_START] = ((xres + right) >> 3) - 1;
par->crtc[VGA_CRTC_H_SYNC_START] = (xres + right) >> 3;
par->crtc[VGA_CRTC_H_SYNC_END] = (((xres + right + hslen) >> 3) & 0x1F)
  | ((((xres + right + hslen) >> 3) & 0x20) << 2);
par->crtc[VGA_CRTC_H_BLANK_END] = ((xres + right + hslen) >> 3 & 0x1F)
  | 0x80;

par->crtc[VGA_CRTC_V_TOTAL] = ytotal - 2;

r7 = 0x10; /* disable linecompare */
if (ytotal & 0x100)
  r7 |= 0x01;
if (ytotal & 0x200)
  r7 |= 0x20;

par->crtc[VGA_CRTC_PRESET_ROW] = 0;
par->crtc[VGA_CRTC_MAX_SCAN] = 0x40; /* 1 scanline, no linecmp */
if (var->vmode & FB_VMODE_DOUBLE)
  par->crtc[VGA_CRTC_MAX_SCAN] |= 0x80;
par->crtc[VGA_CRTC_CURSOR_START] = 0x00;
par->crtc[VGA_CRTC_CURSOR_END] = 0x00;
par->crtc[VGA_CRTC_CURSOR_HI] = 0x00;
par->crtc[VGA_CRTC_CURSOR_LO] = 0x00;
par->crtc[VGA_CRTC_V_DISP_END] = yres-1;
if ((yres-1) & 0x100)
  r7 |= 0x02;
if ((yres-1) & 0x200)
  r7 |= 0x40;

par->crtc[VGA_CRTC_V_BLANK_START] = yres + lower - 1;
par->crtc[VGA_CRTC_V_SYNC_START] = yres + lower - 1;
if ((yres + lower - 1) & 0x100)
  r7 |= 0x0C;
if ((yres + lower - 1) & 0x200) {
  par->crtc[VGA_CRTC_MAX_SCAN] |= 0x20;
  r7 |= 0x80;
}

/* disabled IRQ */
par->crtc[VGA_CRTC_V_SYNC_END] =
  ((yres + lower - 1 + vslen) & 0x0F) & ~0x10;
/* 0x7F for VGA, but some SVGA chips require all 8 bits to be set */
par->crtc[VGA_CRTC_V_BLANK_END] = (yres + lower - 1 + vslen) & 0xFF;

par->crtc[VGA_CRTC_UNDERLINE] = 0x00;
par->crtc[VGA_CRTC_MODE] = 0xC3 ;
par->crtc[VGA_CRTC_LINE_COMPARE] = 0xFF;
par->crtc[VGA_CRTC_OVERFLOW] = r7;

par->vss = 0x00; /* 3DA */

for (i = 0x00; i < 0x10; i++)
  par->atc[i] = i;
par->atc[VGA_ATC_MODE] = 0x81;
par->atc[VGA_ATC_OVERSCAN] = 0x00; /* 0 for EGA, 0xFF for VGA */
par->atc[VGA_ATC_PLANE_ENABLE] = 0x0F;
par->atc[VGA_ATC_COLOR_PAGE] = 0x00;

par->misc = 0xC3;
if (var->sync & FB_SYNC_HOR_HIGH_ACT)
  par->misc &= ~0x40;
if (var->sync & FB_SYNC_VERT_HIGH_ACT)
  par->misc &= ~0x80;

par->seq[VGA_SEQ_CLOCK_MODE] = 0x01;
par->seq[VGA_SEQ_PLANE_WRITE] = 0x0F;
par->seq[VGA_SEQ_CHARACTER_MAP] = 0x00;
par->seq[VGA_SEQ_MEMORY_MODE] = 0x06;

par->gdc[VGA_GFX_SR_VALUE] = 0x00;
par->gdc[VGA_GFX_SR_ENABLE] = 0x00;
par->gdc[VGA_GFX_COMPARE_VALUE] = 0x00;
par->gdc[VGA_GFX_DATA_ROTATE] = 0x00;
par->gdc[VGA_GFX_PLANE_READ] = 0;
par->gdc[VGA_GFX_MODE] = 0x02;
par->gdc[VGA_GFX_MISC] = 0x05;
par->gdc[VGA_GFX_COMPARE_MASK] = 0x0F;
par->gdc[VGA_GFX_BIT_MASK] = 0xFF;

base = (yoffset * vxres + (xoffset & ~7)) >> 2;
switch (bpp) {
case 8:
  par->crtc[VGA_CRTC_OFFSET] = vxres >> 3;
  par->ext_offset = vxres >> 11;
  par->pixelpipe_cfg1 = DISPLAY_8BPP_MODE;
  par->bitblt_cntl = COLEXP_8BPP;
  break;
case 15: /* 0rrrrrgg gggbbbbb */
case 16: /* rrrrrggg gggbbbbb */
  par->pixelpipe_cfg1 = (var->green.length == 6) ?
   DISPLAY_16BPP_MODE : DISPLAY_15BPP_MODE;
  par->crtc[VGA_CRTC_OFFSET] = vxres >> 2;
  par->ext_offset = vxres >> 10;
  par->bitblt_cntl = COLEXP_16BPP;
  base *= 2;
  break;
case 24:
  par->crtc[VGA_CRTC_OFFSET] = (vxres * 3) >> 3;
  par->ext_offset = (vxres * 3) >> 11;
  par->pixelpipe_cfg1 = DISPLAY_24BPP_MODE;
  par->bitblt_cntl = COLEXP_24BPP;
  base &= 0xFFFFFFFE; /* ...ignore the last bit. */
  base *= 3;
  break;
case 32:
  par->crtc[VGA_CRTC_OFFSET] = vxres >> 1;
  par->ext_offset = vxres >> 9;
  par->pixelpipe_cfg1 = DISPLAY_32BPP_MODE;
  par->bitblt_cntl = COLEXP_RESERVED; /* Unimplemented on i740 */
  base *= 4;
  break;
}

par->crtc[VGA_CRTC_START_LO] = base & 0x000000FF;
par->crtc[VGA_CRTC_START_HI] = (base & 0x0000FF00) >>  8;
par->ext_start_addr =
  ((base & 0x003F0000) >> 16) | EXT_START_ADDR_ENABLE;
par->ext_start_addr_hi = (base & 0x3FC00000) >> 22;

par->pixelpipe_cfg0 = DAC_8_BIT;

par->pixelpipe_cfg2 = DISPLAY_GAMMA_ENABLE | OVERLAY_GAMMA_ENABLE;
par->io_cntl = EXTENDED_CRTC_CNTL;
par->address_mapping = LINEAR_MODE_ENABLE | PAGE_MAPPING_ENABLE;
par->display_cntl = HIRES_MODE;

/* Set the MCLK freq */
par->pll_cntl = PLL_MEMCLK_100000KHZ; /* 100 MHz -- use as default */

/* Calculate the extended CRTC regs */
par->ext_vert_total = (ytotal - 2) >> 8;
par->ext_vert_disp_end = (yres - 1) >> 8;
par->ext_vert_sync_start = (yres + lower) >> 8;
par->ext_vert_blank_start = (yres + lower) >> 8;
par->ext_horiz_total = ((xtotal >> 3) - 5) >> 8;
par->ext_horiz_blank = (((xres + right) >> 3) & 0x40) >> 6;

par->interlace_cntl = INTERLACE_DISABLE;

/* Set the overscan color to 0. (NOTE: This only affects >8bpp mode) */
par->atc[VGA_ATC_OVERSCAN] = 0;

/* Calculate VCLK that most closely matches the requested dot clock */
freq = (((u32)1e9) / var->pixclock) * (u32)(1e3);
if (freq < I740_RFREQ_FIX) {
  fb_dbg(info, "invalid pixclock\n");
  freq = I740_RFREQ_FIX;
}
i740_calc_vclk(freq, par);

/* Since we program the clocks ourselves, always use VCLK2. */
par->misc |= 0x0C;

/* Calculate the FIFO Watermark and Burst Length. */
par->lmi_fifo_watermark =
  i740_calc_fifo(par, 1000000 / var->pixclock, bpp);

return 0;
}

static int i740fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
if (!var->pixclock)
  return -EINVAL;

switch (var->bits_per_pixel) {
case 8:
  var->red.offset = var->green.offset = var->blue.offset = 0;
  var->red.length = var->green.length = var->blue.length = 8;
  break;
case 16:
  switch (var->green.length) {
  default:
  case 5:
   var->red.offset = 10;
   var->green.offset = 5;
   var->blue.offset = 0;
   var->red.length = 5;
   var->green.length = 5;
   var->blue.length = 5;
   break;
  case 6:
   var->red.offset = 11;
   var->green.offset = 5;
   var->blue.offset = 0;
   var->red.length = var->blue.length = 5;
   break;
  }
  break;
case 24:
  var->red.offset = 16;
  var->green.offset = 8;
  var->blue.offset = 0;
  var->red.length = var->green.length = var->blue.length = 8;
  break;
case 32:
  var->transp.offset = 24;
  var->red.offset = 16;
  var->green.offset = 8;
  var->blue.offset = 0;
  var->transp.length = 8;
  var->red.length = var->green.length = var->blue.length = 8;
  break;
default:
  return -EINVAL;
}

if (var->xres > var->xres_virtual)
  var->xres_virtual = var->xres;

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

if (info->monspecs.hfmax && info->monspecs.vfmax &&
     info->monspecs.dclkmax && fb_validate_mode(var, info) < 0)
  return -EINVAL;

return 0;
}

static void vga_protect(struct i740fb_par *par)
{
/* disable the display */
i740outreg_mask(par, VGA_SEQ_I, VGA_SEQ_CLOCK_MODE, 0x20, 0x20);

i740inb(par, 0x3DA);
i740outb(par, VGA_ATT_W, 0x00); /* enable palette access */
}

static void vga_unprotect(struct i740fb_par *par)
{
/* reenable display */
i740outreg_mask(par, VGA_SEQ_I, VGA_SEQ_CLOCK_MODE, 0, 0x20);

i740inb(par, 0x3DA);
i740outb(par, VGA_ATT_W, 0x20); /* disable palette access */
}

static int i740fb_set_par(struct fb_info *info)
{
struct i740fb_par *par = info->par;
u32 itemp;
int i;

i = i740fb_decode_var(&info->var, par, info);
if (i)
  return i;

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

vga_protect(par);

i740outreg(par, XRX, DRAM_EXT_CNTL, DRAM_REFRESH_DISABLE);

mdelay(1);

i740outreg(par, XRX, VCLK2_VCO_M, par->video_clk2_m);
i740outreg(par, XRX, VCLK2_VCO_N, par->video_clk2_n);
i740outreg(par, XRX, VCLK2_VCO_MN_MSBS, par->video_clk2_mn_msbs);
i740outreg(par, XRX, VCLK2_VCO_DIV_SEL, par->video_clk2_div_sel);

i740outreg_mask(par, XRX, PIXPIPE_CONFIG_0,
   par->pixelpipe_cfg0 & DAC_8_BIT, 0x80);

i740inb(par, 0x3DA);
i740outb(par, 0x3C0, 0x00);

/* update misc output register */
i740outb(par, VGA_MIS_W, par->misc | 0x01);

/* synchronous reset on */
i740outreg(par, VGA_SEQ_I, VGA_SEQ_RESET, 0x01);
/* write sequencer registers */
i740outreg(par, VGA_SEQ_I, VGA_SEQ_CLOCK_MODE,
   par->seq[VGA_SEQ_CLOCK_MODE] | 0x20);
for (i = 2; i < VGA_SEQ_C; i++)
  i740outreg(par, VGA_SEQ_I, i, par->seq[i]);

/* synchronous reset off */
i740outreg(par, VGA_SEQ_I, VGA_SEQ_RESET, 0x03);

/* deprotect CRT registers 0-7 */
i740outreg(par, VGA_CRT_IC, VGA_CRTC_V_SYNC_END,
   par->crtc[VGA_CRTC_V_SYNC_END]);

/* write CRT registers */
for (i = 0; i < VGA_CRT_C; i++)
  i740outreg(par, VGA_CRT_IC, i, par->crtc[i]);

/* write graphics controller registers */
for (i = 0; i < VGA_GFX_C; i++)
  i740outreg(par, VGA_GFX_I, i, par->gdc[i]);

/* write attribute controller registers */
for (i = 0; i < VGA_ATT_C; i++) {
  i740inb(par, VGA_IS1_RC);  /* reset flip-flop */
  i740outb(par, VGA_ATT_IW, i);
  i740outb(par, VGA_ATT_IW, par->atc[i]);
}

i740inb(par, VGA_IS1_RC);
i740outb(par, VGA_ATT_IW, 0x20);

i740outreg(par, VGA_CRT_IC, EXT_VERT_TOTAL, par->ext_vert_total);
i740outreg(par, VGA_CRT_IC, EXT_VERT_DISPLAY, par->ext_vert_disp_end);
i740outreg(par, VGA_CRT_IC, EXT_VERT_SYNC_START,
   par->ext_vert_sync_start);
i740outreg(par, VGA_CRT_IC, EXT_VERT_BLANK_START,
   par->ext_vert_blank_start);
i740outreg(par, VGA_CRT_IC, EXT_HORIZ_TOTAL, par->ext_horiz_total);
i740outreg(par, VGA_CRT_IC, EXT_HORIZ_BLANK, par->ext_horiz_blank);
i740outreg(par, VGA_CRT_IC, EXT_OFFSET, par->ext_offset);
i740outreg(par, VGA_CRT_IC, EXT_START_ADDR_HI, par->ext_start_addr_hi);
i740outreg(par, VGA_CRT_IC, EXT_START_ADDR, par->ext_start_addr);

i740outreg_mask(par, VGA_CRT_IC, INTERLACE_CNTL,
   par->interlace_cntl, INTERLACE_ENABLE);
i740outreg_mask(par, XRX, ADDRESS_MAPPING, par->address_mapping, 0x1F);
i740outreg_mask(par, XRX, BITBLT_CNTL, par->bitblt_cntl, COLEXP_MODE);
i740outreg_mask(par, XRX, DISPLAY_CNTL,
   par->display_cntl, VGA_WRAP_MODE | GUI_MODE);
i740outreg_mask(par, XRX, PIXPIPE_CONFIG_0, par->pixelpipe_cfg0, 0x9B);
i740outreg_mask(par, XRX, PIXPIPE_CONFIG_2, par->pixelpipe_cfg2, 0x0C);

i740outreg(par, XRX, PLL_CNTL, par->pll_cntl);

i740outreg_mask(par, XRX, PIXPIPE_CONFIG_1,
   par->pixelpipe_cfg1, DISPLAY_COLOR_MODE);

itemp = readl(par->regs + FWATER_BLC);
itemp &= ~(LMI_BURST_LENGTH | LMI_FIFO_WATERMARK);
itemp |= par->lmi_fifo_watermark;
writel(itemp, par->regs + FWATER_BLC);

i740outreg(par, XRX, DRAM_EXT_CNTL, DRAM_REFRESH_60HZ);

i740outreg_mask(par, MRX, COL_KEY_CNTL_1, 0, BLANK_DISP_OVERLAY);
i740outreg_mask(par, XRX, IO_CTNL,
   par->io_cntl, EXTENDED_ATTR_CNTL | EXTENDED_CRTC_CNTL);

if (par->pixelpipe_cfg1 != DISPLAY_8BPP_MODE) {
  i740outb(par, VGA_PEL_MSK, 0xFF);
  i740outb(par, VGA_PEL_IW, 0x00);
  for (i = 0; i < 256; i++) {
   itemp = (par->pixelpipe_cfg0 & DAC_8_BIT) ? i : i >> 2;
   i740outb(par, VGA_PEL_D, itemp);
   i740outb(par, VGA_PEL_D, itemp);
   i740outb(par, VGA_PEL_D, itemp);
  }
}

/* Wait for screen to stabilize. */
mdelay(50);
vga_unprotect(par);

info->fix.line_length =
   info->var.xres_virtual * info->var.bits_per_pixel / 8;
if (info->var.bits_per_pixel == 8)
  info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
else
  info->fix.visual = FB_VISUAL_TRUECOLOR;

return 0;
}

static int i740fb_setcolreg(unsigned regno, unsigned red, unsigned green,
      unsigned blue, unsigned transp,
      struct fb_info *info)
{
u32 r, g, b;

dev_dbg(info->device, "setcolreg: regno: %i, red=%d, green=%d, blue=%d, transp=%d, bpp=%d\n",
  regno, red, green, blue, transp, info->var.bits_per_pixel);

switch (info->fix.visual) {
case FB_VISUAL_PSEUDOCOLOR:
  if (regno >= 256)
   return -EINVAL;
  i740outb(info->par, VGA_PEL_IW, regno);
  i740outb(info->par, VGA_PEL_D, red >> 8);
  i740outb(info->par, VGA_PEL_D, green >> 8);
  i740outb(info->par, VGA_PEL_D, blue >> 8);
  break;
case FB_VISUAL_TRUECOLOR:
  if (regno >= 16)
   return -EINVAL;
  r = (red >> (16 - info->var.red.length))
   << info->var.red.offset;
  b = (blue >> (16 - info->var.blue.length))
   << info->var.blue.offset;
  g = (green >> (16 - info->var.green.length))
   << info->var.green.offset;
  ((u32 *) info->pseudo_palette)[regno] = r | g | b;
  break;
default:
  return -EINVAL;
}

return 0;
}

static int i740fb_pan_display(struct fb_var_screeninfo *var,
     struct fb_info *info)
{
struct i740fb_par *par = info->par;
u32 base = (var->yoffset * info->var.xres_virtual
   + (var->xoffset & ~7)) >> 2;

dev_dbg(info->device, "pan_display: xoffset: %i yoffset: %i base: %i\n",
  var->xoffset, var->yoffset, base);

switch (info->var.bits_per_pixel) {
case 8:
  break;
case 15:
case 16:
  base *= 2;
  break;
case 24:
  /*
* The last bit does not seem to have any effect on the start
* address register in 24bpp mode, so...
*/
  base &= 0xFFFFFFFE; /* ...ignore the last bit. */
  base *= 3;
  break;
case 32:
  base *= 4;
  break;
}

par->crtc[VGA_CRTC_START_LO] = base & 0x000000FF;
par->crtc[VGA_CRTC_START_HI] = (base & 0x0000FF00) >>  8;
par->ext_start_addr_hi = (base & 0x3FC00000) >> 22;
par->ext_start_addr =
   ((base & 0x003F0000) >> 16) | EXT_START_ADDR_ENABLE;

i740outreg(par, VGA_CRT_IC, VGA_CRTC_START_LO,  base & 0x000000FF);
i740outreg(par, VGA_CRT_IC, VGA_CRTC_START_HI,
   (base & 0x0000FF00) >> 8);
i740outreg(par, VGA_CRT_IC, EXT_START_ADDR_HI,
   (base & 0x3FC00000) >> 22);
i740outreg(par, VGA_CRT_IC, EXT_START_ADDR,
   ((base & 0x003F0000) >> 16) | EXT_START_ADDR_ENABLE);

return 0;
}

static int i740fb_blank(int blank_mode, struct fb_info *info)
{
struct i740fb_par *par = info->par;

unsigned char SEQ01;
int DPMSSyncSelect;

switch (blank_mode) {
case FB_BLANK_UNBLANK:
case FB_BLANK_NORMAL:
  SEQ01 = 0x00;
  DPMSSyncSelect = HSYNC_ON | VSYNC_ON;
  break;
case FB_BLANK_VSYNC_SUSPEND:
  SEQ01 = 0x20;
  DPMSSyncSelect = HSYNC_ON | VSYNC_OFF;
  break;
case FB_BLANK_HSYNC_SUSPEND:
  SEQ01 = 0x20;
  DPMSSyncSelect = HSYNC_OFF | VSYNC_ON;
  break;
case FB_BLANK_POWERDOWN:
  SEQ01 = 0x20;
  DPMSSyncSelect = HSYNC_OFF | VSYNC_OFF;
  break;
default:
  return -EINVAL;
}
/* Turn the screen on/off */
i740outb(par, SRX, 0x01);
SEQ01 |= i740inb(par, SRX + 1) & ~0x20;
i740outb(par, SRX, 0x01);
i740outb(par, SRX + 1, SEQ01);

/* Set the DPMS mode */
i740outreg(par, XRX, DPMS_SYNC_SELECT, DPMSSyncSelect);

/* Let fbcon do a soft blank for us */
return (blank_mode == FB_BLANK_NORMAL) ? 1 : 0;
}

static const struct fb_ops i740fb_ops = {
.owner  = THIS_MODULE,
.fb_open = i740fb_open,
.fb_release = i740fb_release,
FB_DEFAULT_IOMEM_OPS,
.fb_check_var = i740fb_check_var,
.fb_set_par = i740fb_set_par,
.fb_setcolreg = i740fb_setcolreg,
.fb_blank = i740fb_blank,
.fb_pan_display = i740fb_pan_display,
};

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

static int i740fb_probe(struct pci_dev *dev, const struct pci_device_id *ent)
{
struct fb_info *info;
struct i740fb_par *par;
int ret, tmp;
bool found = false;
u8 *edid;

ret = aperture_remove_conflicting_pci_devices(dev, "i740fb");
if (ret)
  return ret;

info = framebuffer_alloc(sizeof(struct i740fb_par), &(dev->dev));
if (!info)
  return -ENOMEM;

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

info->var.activate = FB_ACTIVATE_NOW;
info->var.bits_per_pixel = 8;
info->fbops = &i740fb_ops;
info->pseudo_palette = par->pseudo_palette;

ret = pci_enable_device(dev);
if (ret) {
  dev_err(info->device, "cannot enable PCI device\n");
  goto err_enable_device;
}

ret = pci_request_regions(dev, info->fix.id);
if (ret) {
  dev_err(info->device, "error requesting regions\n");
  goto err_request_regions;
}

info->screen_base = pci_ioremap_wc_bar(dev, 0);
if (!info->screen_base) {
  dev_err(info->device, "error remapping base\n");
  ret = -ENOMEM;
  goto err_ioremap_1;
}

par->regs = pci_ioremap_bar(dev, 1);
if (!par->regs) {
  dev_err(info->device, "error remapping MMIO\n");
  ret = -ENOMEM;
  goto err_ioremap_2;
}

/* detect memory size */
if ((i740inreg(par, XRX, DRAM_ROW_TYPE) & DRAM_ROW_1)
       == DRAM_ROW_1_SDRAM)
  i740outb(par, XRX, DRAM_ROW_BNDRY_1);
else
  i740outb(par, XRX, DRAM_ROW_BNDRY_0);
info->screen_size = i740inb(par, XRX + 1) * 1024 * 1024;
/* detect memory type */
tmp = i740inreg(par, XRX, DRAM_ROW_CNTL_LO);
par->has_sgram = !((tmp & DRAM_RAS_TIMING) ||
      (tmp & DRAM_RAS_PRECHARGE));

fb_info(info, "Intel740 on %s, %ld KB %s\n",
  pci_name(dev), info->screen_size >> 10,
  par->has_sgram ? "SGRAM" : "SDRAM");

info->fix = i740fb_fix;
info->fix.mmio_start = pci_resource_start(dev, 1);
info->fix.mmio_len = pci_resource_len(dev, 1);
info->fix.smem_start = pci_resource_start(dev, 0);
info->fix.smem_len = info->screen_size;
info->flags = FBINFO_HWACCEL_YPAN;

if (i740fb_setup_ddc_bus(info) == 0) {
  par->ddc_registered = true;
  edid = fb_ddc_read(&par->ddc_adapter);
  if (edid) {
   fb_edid_to_monspecs(edid, &info->monspecs);
   kfree(edid);
   if (!info->monspecs.modedb)
    dev_err(info->device,
     "error getting mode database\n");
   else {
    const struct fb_videomode *m;

    fb_videomode_to_modelist(
     info->monspecs.modedb,
     info->monspecs.modedb_len,
     &info->modelist);
    m = fb_find_best_display(&info->monspecs,
        &info->modelist);
    if (m) {
     fb_videomode_to_var(&info->var, m);
     /* fill all other info->var's fields */
     if (!i740fb_check_var(&info->var, info))
      found = true;
    }
   }
  }
}

if (!mode_option && !found)
  mode_option = "640x480-8@60";

if (mode_option) {
  ret = fb_find_mode(&info->var, info, mode_option,
       info->monspecs.modedb,
       info->monspecs.modedb_len,
       NULL, info->var.bits_per_pixel);
  if (!ret || ret == 4) {
   dev_err(info->device, "mode %s not found\n",
    mode_option);
   ret = -EINVAL;
  }
}

fb_destroy_modedb(info->monspecs.modedb);
info->monspecs.modedb = NULL;

/* maximize virtual vertical size for fast scrolling */
info->var.yres_virtual = info->fix.smem_len * 8 /
   (info->var.bits_per_pixel * info->var.xres_virtual);

if (ret == -EINVAL)
  goto err_find_mode;

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

ret = register_framebuffer(info);
if (ret) {
  dev_err(info->device, "error registering framebuffer\n");
  goto err_reg_framebuffer;
}

fb_info(info, "%s frame buffer device\n", info->fix.id);
pci_set_drvdata(dev, info);
if (mtrr)
  par->wc_cookie = arch_phys_wc_add(info->fix.smem_start,
        info->fix.smem_len);
return 0;

err_reg_framebuffer:
fb_dealloc_cmap(&info->cmap);
err_alloc_cmap:
err_find_mode:
if (par->ddc_registered)
  i2c_del_adapter(&par->ddc_adapter);
pci_iounmap(dev, par->regs);
err_ioremap_2:
pci_iounmap(dev, info->screen_base);
err_ioremap_1:
pci_release_regions(dev);
err_request_regions:
/* pci_disable_device(dev); */
err_enable_device:
framebuffer_release(info);
return ret;
}

static void i740fb_remove(struct pci_dev *dev)
{
struct fb_info *info = pci_get_drvdata(dev);

if (info) {
  struct i740fb_par *par = info->par;
  arch_phys_wc_del(par->wc_cookie);
  unregister_framebuffer(info);
  fb_dealloc_cmap(&info->cmap);
  if (par->ddc_registered)
   i2c_del_adapter(&par->ddc_adapter);
  pci_iounmap(dev, par->regs);
  pci_iounmap(dev, info->screen_base);
  pci_release_regions(dev);
/* pci_disable_device(dev); */
  framebuffer_release(info);
}
}

static int __maybe_unused i740fb_suspend(struct device *dev)
{
struct fb_info *info = dev_get_drvdata(dev);
struct i740fb_par *par = info->par;

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

/* do nothing if framebuffer is not active */
if (par->ref_count == 0) {
  mutex_unlock(&(par->open_lock));
  console_unlock();
  return 0;
}

fb_set_suspend(info, 1);

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

return 0;
}

static int __maybe_unused i740fb_resume(struct device *dev)
{
struct fb_info *info = dev_get_drvdata(dev);
struct i740fb_par *par = info->par;

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

if (par->ref_count == 0)
  goto fail;

i740fb_set_par(info);
fb_set_suspend(info, 0);

fail:
mutex_unlock(&(par->open_lock));
console_unlock();
return 0;
}

static const struct dev_pm_ops i740fb_pm_ops = {
#ifdef CONFIG_PM_SLEEP
.suspend = i740fb_suspend,
.resume  = i740fb_resume,
.freeze  = NULL,
.thaw  = i740fb_resume,
.poweroff = i740fb_suspend,
.restore = i740fb_resume,
#endif /* CONFIG_PM_SLEEP */
};

#define I740_ID_PCI 0x00d1
#define I740_ID_AGP 0x7800

static const struct pci_device_id i740fb_id_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, I740_ID_PCI) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, I740_ID_AGP) },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, i740fb_id_table);

static struct pci_driver i740fb_driver = {
.name  = "i740fb",
.id_table = i740fb_id_table,
.probe  = i740fb_probe,
.remove  = i740fb_remove,
.driver.pm = &i740fb_pm_ops,
};

#ifndef MODULE
static int  __init i740fb_setup(char *options)
{
char *opt;

if (!options || !*options)
  return 0;

while ((opt = strsep(&options, ",")) != NULL) {
  if (!*opt)
   continue;
  else if (!strncmp(opt, "mtrr:", 5))
   mtrr = simple_strtoul(opt + 5, NULL, 0);
  else
   mode_option = opt;
}

return 0;
}
#endif

static int __init i740fb_init(void)
{
#ifndef MODULE
char *option = NULL;
#endif

if (fb_modesetting_disabled("i740fb"))
  return -ENODEV;

#ifndef MODULE
if (fb_get_options("i740fb", &option))
  return -ENODEV;
i740fb_setup(option);
#endif

return pci_register_driver(&i740fb_driver);
}

static void __exit i740fb_exit(void)
{
pci_unregister_driver(&i740fb_driver);
}

module_init(i740fb_init);
module_exit(i740fb_exit);

MODULE_AUTHOR("(c) 2011 Ondrej Zary <linux@rainbow-software.org>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("fbdev driver for Intel740");

module_param(mode_option, charp, 0444);
MODULE_PARM_DESC(mode_option, "Default video mode ('640x480-8@60', etc)");

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

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