intelfbdrv.c

Linux环境下视频显示卡设备的驱动程序源代码

/*
 * intelfb
 *
 * Linux framebuffer driver for Intel(R) 830M/845G/852GM/855GM/865G/915G/915GM/
 * 945G/945GM/945GME/965G/965GM integrated graphics chips.
 *
 * Copyright © 2002, 2003 David Dawes <[e-mail]>
 *                   2004 Sylvain Meyer
 *                   2006 David Airlie
 *
 * This driver consists of two parts.  The first part (intelfbdrv.c) provides
 * the basic fbdev interfaces, is derived in part from the radeonfb and
 * vesafb drivers, and is covered by the GPL.  The second part (intelfbhw.c)
 * provides the code to program the hardware.  Most of it is derived from
 * the i810/i830 XFree86 driver.  The HW-specific code is covered here
 * under a dual license (GPL and MIT/XFree86 license).
 *
 * Author: David Dawes
 *
 */

/* $DHD: intelfb/intelfbdrv.c,v 1.20 2003/06/27 15:17:40 dawes Exp $ */

/*
 * Changes:
 *    01/2003 - Initial driver (0.1.0), no mode switching, no acceleration.
 *		This initial version is a basic core that works a lot like
 *		the vesafb driver.  It must be built-in to the kernel,
 *		and the initial video mode must be set with vga=XXX at
 *		boot time.  (David Dawes)
 *
 *    01/2003 - Version 0.2.0: Mode switching added, colormap support
 *		implemented, Y panning, and soft screen blanking implemented.
 *		No acceleration yet.  (David Dawes)
 *
 *    01/2003 - Version 0.3.0: fbcon acceleration support added.  Module
 *		option handling added.  (David Dawes)
 *
 *    01/2003 - Version 0.4.0: fbcon HW cursor support added.  (David Dawes)
 *
 *    01/2003 - Version 0.4.1: Add auto-generation of built-in modes.
 *		(David Dawes)
 *
 *    02/2003 - Version 0.4.2: Add check for active non-CRT devices, and
 *		mode validation checks.  (David Dawes)
 *
 *    02/2003 - Version 0.4.3: Check when the VC is in graphics mode so that
 *		acceleration is disabled while an XFree86 server is running.
 *		(David Dawes)
 *
 *    02/2003 - Version 0.4.4: Monitor DPMS support.  (David Dawes)
 *
 *    02/2003 - Version 0.4.5: Basic XFree86 + fbdev working.  (David Dawes)
 *
 *    02/2003 - Version 0.5.0: Modify to work with the 2.5.32 kernel as well
 *		as 2.4.x kernels.  (David Dawes)
 *
 *    02/2003 - Version 0.6.0: Split out HW-specifics into a separate file.
 *		(David Dawes)
 *
 *    02/2003 - Version 0.7.0: Test on 852GM/855GM.  Acceleration and HW
 *		cursor are disabled on this platform.  (David Dawes)
 *
 *    02/2003 - Version 0.7.1: Test on 845G.  Acceleration is disabled
 *		on this platform.  (David Dawes)
 *
 *    02/2003 - Version 0.7.2: Test on 830M.  Acceleration and HW
 *		cursor are disabled on this platform.  (David Dawes)
 *
 *    02/2003 - Version 0.7.3: Fix 8-bit modes for mobile platforms
 *		(David Dawes)
 *
 *    02/2003 - Version 0.7.4: Add checks for FB and FBCON_HAS_CFB* configured
 *		in the kernel, and add mode bpp verification and default
 *		bpp selection based on which FBCON_HAS_CFB* are configured.
 *		(David Dawes)
 *
 *    02/2003 - Version 0.7.5: Add basic package/install scripts based on the
 *		DRI packaging scripts.  (David Dawes)
 *
 *    04/2003 - Version 0.7.6: Fix typo that affects builds with SMP-enabled
 *		kernels.  (David Dawes, reported by Anupam).
 *
 *    06/2003 - Version 0.7.7:
 *              Fix Makefile.kernel build problem (Tsutomu Yasuda).
 *		Fix mis-placed #endif (2.4.21 kernel).
 *
 *    09/2004 - Version 0.9.0 - by Sylvain Meyer
 *              Port to linux 2.6 kernel fbdev
 *              Fix HW accel and HW cursor on i845G
 *              Use of agpgart for fb memory reservation
 *              Add mtrr support
 *
 *    10/2004 - Version 0.9.1
 *              Use module_param instead of old MODULE_PARM
 *              Some cleanup
 *
 *    11/2004 - Version 0.9.2
 *              Add vram option to reserve more memory than stolen by BIOS
 *              Fix intelfbhw_pan_display typo
 *              Add __initdata annotations
 *
 *    04/2008 - Version 0.9.5
 *              Add support for 965G/965GM. (Maik Broemme <[e-mail]>)
 *
 *    08/2008 - Version 0.9.6
 *              Add support for 945GME. (Phil Endecott <[e-mail]>)
 */

#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/ioport.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/screen_info.h>

#include <asm/io.h>

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

#include "intelfb.h"
#include "intelfbhw.h"
#include "../edid.h"

static void __devinit get_initial_mode(struct intelfb_info *dinfo);
static void update_dinfo(struct intelfb_info *dinfo,
			 struct fb_var_screeninfo *var);
static int intelfb_open(struct fb_info *info, int user);
static int intelfb_release(struct fb_info *info, int user);
static int intelfb_check_var(struct fb_var_screeninfo *var,
			     struct fb_info *info);
static int intelfb_set_par(struct fb_info *info);
static int intelfb_setcolreg(unsigned regno, unsigned red, unsigned green,
			     unsigned blue, unsigned transp,
			     struct fb_info *info);

static int intelfb_blank(int blank, struct fb_info *info);
static int intelfb_pan_display(struct fb_var_screeninfo *var,
			       struct fb_info *info);

static void intelfb_fillrect(struct fb_info *info,
			     const struct fb_fillrect *rect);
static void intelfb_copyarea(struct fb_info *info,
			     const struct fb_copyarea *region);
static void intelfb_imageblit(struct fb_info *info,
			      const struct fb_image *image);
static int intelfb_cursor(struct fb_info *info,
			   struct fb_cursor *cursor);

static int intelfb_sync(struct fb_info *info);

static int intelfb_ioctl(struct fb_info *info,
			 unsigned int cmd, unsigned long arg);

static int __devinit intelfb_pci_register(struct pci_dev *pdev,
					  const struct pci_device_id *ent);
static void __devexit intelfb_pci_unregister(struct pci_dev *pdev);
static int __devinit intelfb_set_fbinfo(struct intelfb_info *dinfo);

/*
 * Limiting the class to PCI_CLASS_DISPLAY_VGA prevents function 1 of the
 * mobile chipsets from being registered.
 */
#if DETECT_VGA_CLASS_ONLY
#define INTELFB_CLASS_MASK ~0 << 8
#else
#define INTELFB_CLASS_MASK 0
#endif

static struct pci_device_id intelfb_pci_table[] __devinitdata = {
	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_830M, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_830M },
	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_845G, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_845G },
	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_85XGM, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_85XGM },
	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_865G, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_865G },
	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_915G, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_915G },
	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_915GM, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_915GM },
	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_945G, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_945G },
	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_945GM, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_945GM },
	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_945GME, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_945GME },
	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_965G, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_965G },
	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_965GM, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_965GM },
	{ 0, }
};

/* Global data */
static int num_registered = 0;

/* fb ops */
static struct fb_ops intel_fb_ops = {
	.owner =		THIS_MODULE,
	.fb_open =              intelfb_open,
	.fb_release =           intelfb_release,
	.fb_check_var =         intelfb_check_var,
	.fb_set_par =           intelfb_set_par,
	.fb_setcolreg =		intelfb_setcolreg,
	.fb_blank =		intelfb_blank,
	.fb_pan_display =       intelfb_pan_display,
	.fb_fillrect  =         intelfb_fillrect,
	.fb_copyarea  =         intelfb_copyarea,
	.fb_imageblit =         intelfb_imageblit,
	.fb_cursor =            intelfb_cursor,
	.fb_sync =              intelfb_sync,
	.fb_ioctl =		intelfb_ioctl
};

/* PCI driver module table */
static struct pci_driver intelfb_driver = {
	.name =		"intelfb",
	.id_table =	intelfb_pci_table,
	.probe =	intelfb_pci_register,
	.remove =	__devexit_p(intelfb_pci_unregister)
};

/* Module description/parameters */
MODULE_AUTHOR("David Dawes <[e-mail]>, "
	      "Sylvain Meyer <[e-mail]>");
MODULE_DESCRIPTION("Framebuffer driver for Intel(R) " SUPPORTED_CHIPSETS
		   " chipsets");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DEVICE_TABLE(pci, intelfb_pci_table);

static int accel        = 1;
static int vram         = 4;
static int hwcursor     = 0;
static int mtrr         = 1;
static int fixed        = 0;
static int noinit       = 0;
static int noregister   = 0;
static int probeonly    = 0;
static int idonly       = 0;
static int bailearly    = 0;
static int voffset	= 48;
static char *mode       = NULL;

module_param(accel, bool, S_IRUGO);
MODULE_PARM_DESC(accel, "Enable hardware acceleration");
module_param(vram, int, S_IRUGO);
MODULE_PARM_DESC(vram, "System RAM to allocate to framebuffer in MiB");
module_param(voffset, int, S_IRUGO);
MODULE_PARM_DESC(voffset, "Offset of framebuffer in MiB");
module_param(hwcursor, bool, S_IRUGO);
MODULE_PARM_DESC(hwcursor, "Enable HW cursor");
module_param(mtrr, bool, S_IRUGO);
MODULE_PARM_DESC(mtrr, "Enable MTRR support");
module_param(fixed, bool, S_IRUGO);
MODULE_PARM_DESC(fixed, "Disable mode switching");
module_param(noinit, bool, 0);
MODULE_PARM_DESC(noinit, "Don't initialise graphics mode when loading");
module_param(noregister, bool, 0);
MODULE_PARM_DESC(noregister, "Don't register, just probe and exit (debug)");
module_param(probeonly, bool, 0);
MODULE_PARM_DESC(probeonly, "Do a minimal probe (debug)");
module_param(idonly, bool, 0);
MODULE_PARM_DESC(idonly, "Just identify without doing anything else (debug)");
module_param(bailearly, bool, 0);
MODULE_PARM_DESC(bailearly, "Bail out early, depending on value (debug)");
module_param(mode, charp, S_IRUGO);
MODULE_PARM_DESC(mode,
		 "Initial video mode \"<xres>x<yres>[-<depth>][@<refresh>]\"");

#ifndef MODULE
#define OPT_EQUAL(opt, name) (!strncmp(opt, name, strlen(name)))
#define OPT_INTVAL(opt, name) simple_strtoul(opt + strlen(name) + 1, NULL, 0)
#define OPT_STRVAL(opt, name) (opt + strlen(name))

static __inline__ char * get_opt_string(const char *this_opt, const char *name)
{
	const char *p;
	int i;
	char *ret;

	p = OPT_STRVAL(this_opt, name);
	i = 0;
	while (p[i] && p[i] != ' ' && p[i] != ',')
		i++;
	ret = kmalloc(i + 1, GFP_KERNEL);
	if (ret) {
		strncpy(ret, p, i);
		ret[i] = '\0';
	}
	return ret;
}

static __inline__ int get_opt_int(const char *this_opt, const char *name,
				  int *ret)
{
	if (!ret)
		return 0;

	if (!OPT_EQUAL(this_opt, name))
		return 0;

	*ret = OPT_INTVAL(this_opt, name);
	return 1;
}

static __inline__ int get_opt_bool(const char *this_opt, const char *name,
				   int *ret)
{
	if (!ret)
		return 0;

	if (OPT_EQUAL(this_opt, name)) {
		if (this_opt[strlen(name)] == '=')
			*ret = simple_strtoul(this_opt + strlen(name) + 1,
					      NULL, 0);
		else
			*ret = 1;
	} else {
		if (OPT_EQUAL(this_opt, "no") && OPT_EQUAL(this_opt + 2, name))
			*ret = 0;
		else
			return 0;
	}
	return 1;
}

static int __init intelfb_setup(char *options)
{
	char *this_opt;

	DBG_MSG("intelfb_setup\n");

	if (!options || !*options) {
		DBG_MSG("no options\n");
		return 0;
	} else
		DBG_MSG("options: %s\n", options);

	/*
	 * These are the built-in options analogous to the module parameters
	 * defined above.
	 *
	 * The syntax is:
	 *
	 *    video=intelfb:[mode][,<param>=<val>] ...
	 *
	 * e.g.,
	 *
	 *    video=intelfb:1024x768-16@75,accel=0
	 */

	while ((this_opt = strsep(&options, ","))) {
		if (!*this_opt)
			continue;
		if (get_opt_bool(this_opt, "accel", &accel))
			;
		else if (get_opt_int(this_opt, "vram", &vram))
			;
		else if (get_opt_bool(this_opt, "hwcursor", &hwcursor))
			;
		else if (get_opt_bool(this_opt, "mtrr", &mtrr))
			;
		else if (get_opt_bool(this_opt, "fixed", &fixed))
			;
		else if (get_opt_bool(this_opt, "init", &noinit))
			noinit = !noinit;
		else if (OPT_EQUAL(this_opt, "mode="))
			mode = get_opt_string(this_opt, "mode=");
		else
			mode = this_opt;
	}

	return 0;
}

#endif

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

	DBG_MSG("intelfb_init\n");

	INF_MSG("Framebuffer driver for "
		"Intel(R) " SUPPORTED_CHIPSETS " chipsets\n");
	INF_MSG("Version " INTELFB_VERSION "\n");

	if (idonly)
		return -ENODEV;

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

	return pci_register_driver(&intelfb_driver);
}

static void __exit intelfb_exit(void)
{
	DBG_MSG("intelfb_exit\n");
	pci_unregister_driver(&intelfb_driver);
}

module_init(intelfb_init);
module_exit(intelfb_exit);

/***************************************************************
 *                     mtrr support functions                  *
 ***************************************************************/

#ifdef CONFIG_MTRR
static inline void __devinit set_mtrr(struct intelfb_info *dinfo)
{
	dinfo->mtrr_reg = mtrr_add(dinfo->aperture.physical,
				   dinfo->aperture.size, MTRR_TYPE_WRCOMB, 1);
	if (dinfo->mtrr_reg < 0) {
		ERR_MSG("unable to set MTRR\n");
		return;
	}
	dinfo->has_mtrr = 1;
}
static inline void unset_mtrr(struct intelfb_info *dinfo)
{
	if (dinfo->has_mtrr)
		mtrr_del(dinfo->mtrr_reg, dinfo->aperture.physical,
			 dinfo->aperture.size);
}
#else
#define set_mtrr(x) WRN_MSG("MTRR is disabled in the kernel\n")

#define unset_mtrr(x) do { } while (0)
#endif /* CONFIG_MTRR */

/***************************************************************
 *                        driver init / cleanup                *
 ***************************************************************/

static void cleanup(struct intelfb_info *dinfo)
{
	DBG_MSG("cleanup\n");

	if (!dinfo)
		return;

	intelfbhw_disable_irq(dinfo);

	fb_dealloc_cmap(&dinfo->info->cmap);
	kfree(dinfo->info->pixmap.addr);

	if (dinfo->registered)
		unregister_framebuffer(dinfo->info);

	unset_mtrr(dinfo);

	if (dinfo->fbmem_gart && dinfo->gtt_fb_mem) {
		agp_unbind_memory(dinfo->gtt_fb_mem);
		agp_free_memory(dinfo->gtt_fb_mem);
	}
	if (dinfo->gtt_cursor_mem) {
		agp_unbind_memory(dinfo->gtt_cursor_mem);
		agp_free_memory(dinfo->gtt_cursor_mem);
	}
	if (dinfo->gtt_ring_mem) {
		agp_unbind_memory(dinfo->gtt_ring_mem);
		agp_free_memory(dinfo->gtt_ring_mem);
	}

#ifdef CONFIG_FB_INTEL_I2C
	/* un-register I2C bus */
	intelfb_delete_i2c_busses(dinfo);
#endif

	if (dinfo->mmio_base)
		iounmap((void __iomem *)dinfo->mmio_base);
	if (dinfo->aperture.virtual)
		iounmap((void __iomem *)dinfo->aperture.virtual);

	if (dinfo->flag & INTELFB_MMIO_ACQUIRED)
		release_mem_region(dinfo->mmio_base_phys, INTEL_REG_SIZE);
	if (dinfo->flag & INTELFB_FB_ACQUIRED)
		release_mem_region(dinfo->aperture.physical,
				   dinfo->aperture.size);
	framebuffer_release(dinfo->info);
}

#define bailout(dinfo) do {						\
	DBG_MSG("bailout\n");						\
	cleanup(dinfo);							\
	INF_MSG("Not going to register framebuffer, exiting...\n");	\
	return -ENODEV;							\
} while (0)


static int __devinit intelfb_pci_register(struct pci_dev *pdev,
					  const struct pci_device_id *ent)
{
	struct fb_info *info;
	struct intelfb_info *dinfo;
	int i, err, dvo;
	int aperture_size, stolen_size;
	struct agp_kern_info gtt_info;
	int agp_memtype;
	const char *s;
	struct agp_bridge_data *bridge;
	int aperture_bar = 0;
	int mmio_bar = 1;
	int offset;

	DBG_MSG("intelfb_pci_register\n");

	num_registered++;
	if (num_registered != 1) {
		ERR_MSG("Attempted to register %d devices "
			"(should be only 1).\n", num_registered);
		return -ENODEV;
	}

	info = framebuffer_alloc(sizeof(struct intelfb_info), &pdev->dev);
	if (!info) {
		ERR_MSG("Could not allocate memory for intelfb_info.\n");
		return -ENODEV;
	}
	if (fb_alloc_cmap(&info->cmap, 256, 1) < 0) {
		ERR_MSG("Could not allocate cmap for intelfb_info.\n");
		goto err_out_cmap;
		return -ENODEV;
	}

	dinfo = info->par;
	dinfo->info  = info;
	dinfo->fbops = &intel_fb_ops;
	dinfo->pdev  = pdev;

	/* Reserve pixmap space. */
	info->pixmap.addr = kzalloc(64 * 1024, GFP_KERNEL);
	if (info->pixmap.addr == NULL) {
		ERR_MSG("Cannot reserve pixmap memory.\n");
		goto err_out_pixmap;
	}

	/* set early this option because it could be changed by tv encoder
	   driver */
	dinfo->fixed_mode = fixed;

	/* Enable device. */
	if ((err = pci_enable_device(pdev))) {
		ERR_MSG("Cannot enable device.\n");
		cleanup(dinfo);
		return -ENODEV;
	}

	/* Set base addresses. */
	if ((ent->device == PCI_DEVICE_ID_INTEL_915G) ||
	    (ent->device == PCI_DEVICE_ID_INTEL_915GM) ||
	    (ent->device == PCI_DEVICE_ID_INTEL_945G)  ||
	    (ent->device == PCI_DEVICE_ID_INTEL_945GM) ||
	    (ent->device == PCI_DEVICE_ID_INTEL_945GME) ||
	    (ent->device == PCI_DEVICE_ID_INTEL_965G) ||
	    (ent->device == PCI_DEVICE_ID_INTEL_965GM)) {

		aperture_bar = 2;