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linux/drivers/video/fbdev/i740fb.c
Thomas Zimmermann 0ba2fa8cbd fbdev: Add support for the nomodeset kernel parameter 
Support the kernel's nomodeset parameter for all PCI-based fbdev
drivers that use aperture helpers to remove other, hardware-agnostic
graphics drivers.

The parameter is a simple way of using the firmware-provided scanout
buffer if the hardware's native driver is broken. The same effect
could be achieved with per-driver options, but the importance of the
graphics output for many users makes a single, unified approach
worthwhile.

With nomodeset specified, the fbdev driver module will not load. This
unifies behavior with similar DRM drivers. In DRM helpers, modules
first check the nomodeset parameter before registering the PCI
driver. As fbdev has no such module helpers, we have to modify each
driver individually.

The name 'nomodeset' is slightly misleading, but has been chosen for
historical reasons. Several drivers implemented it before it became a
general option for DRM. So keeping the existing name was preferred over
introducing a new one.

v2:
	* print a warning if a driver does not init (Helge)
	* wrap video_firmware_drivers_only() in helper

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221111133024.9897-3-tzimmermann@suse.de
2022-11-16 13:26:25 +01:00

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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.class = I2C_CLASS_DDC;
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_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,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
/* ------------------------------------------------------------------------- */
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_DEFAULT | 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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