valkyriefb.c

S3C44B0X下的LCD （framebuffer）驱动资料与相关代码

/*
 *  valkyriefb.c -- frame buffer device for the PowerMac 'valkyrie' display
 *
 *  Created 8 August 1998 by 
 *  Martin Costabel <[e-mail]> and Kevin Schoedel
 *
 *  Vmode-switching changes and vmode 15/17 modifications created 29 August
 *  1998 by Barry K. Nathan <[e-mail]>.
 *
 *  Ported to m68k Macintosh by David Huggins-Daines <[e-mail]>
 *
 *  Derived directly from:
 *
 *   controlfb.c -- frame buffer device for the PowerMac 'control' display
 *   Copyright (C) 1998 Dan Jacobowitz <[e-mail]>
 *
 *   pmc-valkyrie.c -- Console support for PowerMac "valkyrie" display adaptor.
 *   Copyright (C) 1997 Paul Mackerras.
 *
 *  and indirectly:
 *
 *  Frame buffer structure from:
 *    drivers/video/chipsfb.c -- frame buffer device for
 *    Chips & Technologies 65550 chip.
 *
 *    Copyright (C) 1998 Paul Mackerras
 *
 *    This file is derived from the Powermac "chips" driver:
 *    Copyright (C) 1997 Fabio Riccardi.
 *    And from the frame buffer device for Open Firmware-initialized devices:
 *    Copyright (C) 1997 Geert Uytterhoeven.
 *
 *  Hardware information from:
 *    control.c: Console support for PowerMac "control" display adaptor.
 *    Copyright (C) 1996 Paul Mackerras
 *
 *  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.
 */

#include <linux/config.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/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/selection.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/nvram.h>
#ifdef CONFIG_FB_COMPAT_XPMAC
#include <asm/vc_ioctl.h>
#endif
#include <linux/adb.h>
#include <linux/cuda.h>
#include <asm/io.h>
#ifdef CONFIG_MAC
#include <asm/bootinfo.h>
#include <asm/macintosh.h>
#else
#include <asm/prom.h>
#endif
#include <asm/pgtable.h>

#include <video/fbcon.h>
#include <video/fbcon-cfb8.h>
#include <video/fbcon-cfb16.h>
#include <video/macmodes.h>

#include "valkyriefb.h"

static int can_soft_blank = 1;

#ifdef CONFIG_MAC
/* We don't yet have functions to read the PRAM... perhaps we can
   adapt them from the PPC code? */
static int default_vmode = VMODE_640_480_67;
static int default_cmode = CMODE_8;
#else
static int default_vmode = VMODE_NVRAM;
static int default_cmode = CMODE_NVRAM;
#endif
static char fontname[40] __initdata = { 0 };

static int currcon = 0;
static int switching = 0;

struct fb_par_valkyrie {
	int	vmode, cmode;
	int	xres, yres;
	int	vxres, vyres;
	int	xoffset, yoffset;
};

struct fb_info_valkyrie {
	struct fb_info			info;
	struct fb_fix_screeninfo	fix;
	struct fb_var_screeninfo	var;
	struct display			disp;
	struct fb_par_valkyrie		par;
	struct {
	    __u8 red, green, blue;
	}			palette[256];
	
	struct cmap_regs	*cmap_regs;
	unsigned long		cmap_regs_phys;
	
	struct valkyrie_regs	*valkyrie_regs;
	unsigned long		valkyrie_regs_phys;
	
	__u8			*frame_buffer;
	unsigned long		frame_buffer_phys;
	
	int			sense;
	unsigned long		total_vram;
#ifdef FBCON_HAS_CFB16
	u16 fbcon_cfb16_cmap[16];
#endif
};

/*
 * Exported functions
 */
int valkyriefb_init(void);
int valkyriefb_setup(char*);

static int valkyrie_get_fix(struct fb_fix_screeninfo *fix, int con,
			 struct fb_info *info);
static int valkyrie_get_var(struct fb_var_screeninfo *var, int con,
			 struct fb_info *info);
static int valkyrie_set_var(struct fb_var_screeninfo *var, int con,
			 struct fb_info *info);
static int valkyrie_get_cmap(struct fb_cmap *cmap, int kspc, int con,
			  struct fb_info *info);
static int valkyrie_set_cmap(struct fb_cmap *cmap, int kspc, int con,
			  struct fb_info *info);

static int read_valkyrie_sense(struct fb_info_valkyrie *p);
static inline int valkyrie_vram_reqd(int video_mode, int color_mode);
static void set_valkyrie_clock(unsigned char *params);
static void valkyrie_set_par(const struct fb_par_valkyrie *p, struct fb_info_valkyrie *info);
static inline int valkyrie_par_to_var(struct fb_par_valkyrie *par, struct fb_var_screeninfo *var);
static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
	struct fb_par_valkyrie *par, const struct fb_info *fb_info);

static void valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p);
static void valkyrie_par_to_display(struct fb_par_valkyrie *par,
  struct display *disp, struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p);
static void valkyrie_init_display(struct display *disp);
static void valkyrie_par_to_fix(struct fb_par_valkyrie *par, struct fb_fix_screeninfo *fix,
	struct fb_info_valkyrie *p);
static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p);

static struct fb_ops valkyriefb_ops = {
	owner:		THIS_MODULE,
	fb_get_fix:	valkyrie_get_fix,
	fb_get_var:	valkyrie_get_var,
	fb_set_var:	valkyrie_set_var,
	fb_get_cmap:	valkyrie_get_cmap,
	fb_set_cmap:	valkyrie_set_cmap,
};

static int valkyriefb_getcolreg(u_int regno, u_int *red, u_int *green,
			     u_int *blue, u_int *transp, struct fb_info *info);
static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
			     u_int transp, struct fb_info *info);
static void do_install_cmap(int con, struct fb_info *info);

static int valkyrie_get_fix(struct fb_fix_screeninfo *fix, int con,
			 struct fb_info *info)
{
	struct fb_info_valkyrie *cp = (struct fb_info_valkyrie *) info;

	*fix = cp->fix;
	return 0;
}

static int valkyrie_get_var(struct fb_var_screeninfo *var, int con,
			 struct fb_info *info)
{
	struct fb_info_valkyrie *cp = (struct fb_info_valkyrie *) info;

	*var = cp->var;
	return 0;
}

/* Sets everything according to var */
static int valkyrie_set_var(struct fb_var_screeninfo *var, int con,
			 struct fb_info *info)
{
	struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;
	struct display *disp;
	struct fb_par_valkyrie par;
	int depthchange, err;

	disp = (con >= 0) ? &fb_display[con] : &p->disp;
	if ((err = valkyrie_var_to_par(var, &par, info))) {
		 /* printk (KERN_ERR "Error in valkyrie_set_var, calling valkyrie_var_to_par: %d.\n", err); */
		return err;
	}
	
	if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW) {
		/* printk(KERN_ERR "Not activating, in valkyrie_set_var.\n"); */
		valkyrie_par_to_var(&par, var);
		return 0;
	}

	/*
	 * I know, we want to use fb_display[con], but grab certain info
	 * from p->var instead.
	 */
#define DIRTY(x) (p->var.x != var->x)
	depthchange = DIRTY(bits_per_pixel);
	/* adding "&& !DIRTY(pixclock)" corrects vmode-switching problems */
	if(!DIRTY(xres) && !DIRTY(yres) && !DIRTY(xres_virtual) &&
	   !DIRTY(yres_virtual) && !DIRTY(bits_per_pixel) && !DIRTY(pixclock)) {
	   	valkyrie_par_to_var(&par, var);
		p->var = disp->var = *var;
		return 0;
	}

	p->par = par;
	valkyrie_par_to_var(&par, var);
	p->var = *var;
	valkyrie_par_to_fix(&par, &p->fix, p);
	valkyrie_par_to_display(&par, disp, &p->fix, p);
	p->disp = *disp;
	
	if (info->changevar && !switching) {
		/* Don't want to do this if just switching consoles. */
		(*info->changevar)(con);
	}
	if (con == currcon)
		valkyrie_set_par(&par, p);
	if (depthchange)
		if ((err = fb_alloc_cmap(&disp->cmap, 0, 0)))
			return err;
	if (depthchange || switching)
		do_install_cmap(con, info);
	return 0;
}

static int valkyrie_get_cmap(struct fb_cmap *cmap, int kspc, int con,
			  struct fb_info *info)
{
	if (con == currcon)	{
		/* current console? */
		return fb_get_cmap(cmap, kspc, valkyriefb_getcolreg, info);
	}
	if (fb_display[con].cmap.len) { /* non default colormap? */
		fb_copy_cmap(&fb_display[con].cmap, cmap, kspc? 0: 2);
	}
	else {
		int size = fb_display[con].var.bits_per_pixel == 16 ? 32 : 256;
		fb_copy_cmap(fb_default_cmap(size), cmap, kspc ? 0 : 2);
	}
	return 0;
}

static int valkyrie_set_cmap(struct fb_cmap *cmap, int kspc, int con,
			 struct fb_info *info)
{
	struct display *disp = &fb_display[con];
	int err;

	if (disp->cmap.len == 0) {
		int size = fb_display[con].var.bits_per_pixel == 16 ? 32 : 256;
		err = fb_alloc_cmap(&disp->cmap, size, 0);
		if (err) {
			return err;
		}
	}

	if (con == currcon) {
		return fb_set_cmap(cmap, kspc, valkyriefb_setcolreg, info);
	}
	fb_copy_cmap(cmap, &disp->cmap, kspc ? 0 : 1);
	return 0;
}

static int valkyriefb_switch(int con, struct fb_info *fb)
{
	struct fb_info_valkyrie *info = (struct fb_info_valkyrie *) fb;
	struct fb_par_valkyrie par;

	if (fb_display[currcon].cmap.len)
		fb_get_cmap(&fb_display[currcon].cmap, 1, valkyriefb_getcolreg,
			    fb);
	currcon = con;
#if 1
	valkyrie_var_to_par(&fb_display[currcon].var, &par, fb);
	valkyrie_set_par(&par, info);
	do_install_cmap(con, fb);
#else
	/* I see no reason not to do this.  Minus info->changevar(). */
	/* DOH.  This makes valkyrie_set_var compare, you guessed it, */
	/* fb_display[con].var (first param), and fb_display[con].var! */
	/* Perhaps I just fixed that... */
	switching = 1;
	valkyrie_set_var(&fb_display[con].var, con, info);
	switching = 0;
#endif
	return 0;
}

static int valkyriefb_updatevar(int con, struct fb_info *info)
{
	return 0;
}

static void valkyriefb_blank(int blank_mode, struct fb_info *info)
{
/*
 *  Blank the screen if blank_mode != 0, else unblank. If blank_mode == NULL
 *  then the caller blanks by setting the CLUT (Color Look Up Table) to all
 *  black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
 *  to e.g. a video mode which doesn't support it. Implements VESA suspend
 *  and powerdown modes on hardware that supports disabling hsync/vsync:
 *    blank_mode == 2: suspend vsync
 *    blank_mode == 3: suspend hsync
 *    blank_mode == 4: powerdown
 */
	struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;
	struct valkyrie_regvals	*init;
	unsigned char vmode;

	if (p->disp.can_soft_blank
	 && ((vmode = p->par.vmode) > 0)
	 && (vmode <= VMODE_MAX)
	 && ((init = valkyrie_reg_init[vmode - 1]) != NULL)) {
		if (blank_mode)
			--blank_mode;
		switch (blank_mode) {
		default:	/* unblank */
			out_8(&p->valkyrie_regs->mode.r, init->mode);
			break;
		case VESA_VSYNC_SUSPEND:
		case VESA_HSYNC_SUSPEND:
			/*
			 * [kps] Value extracted from MacOS. I don't know
			 * whether this bit disables hsync or vsync, or
			 * whether the hardware can do the other as well.
			 */
			out_8(&p->valkyrie_regs->mode.r, init->mode | 0x40);
			break;
		case VESA_POWERDOWN:
			out_8(&p->valkyrie_regs->mode.r, 0x66);
			break;
		}
	}
}

static int valkyriefb_getcolreg(u_int regno, u_int *red, u_int *green,
			     u_int *blue, u_int *transp, struct fb_info *info)
{
	struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;

	if (regno > 255)
		return 1;
	*red = (p->palette[regno].red<<8) | p->palette[regno].red;
	*green = (p->palette[regno].green<<8) | p->palette[regno].green;
	*blue = (p->palette[regno].blue<<8) | p->palette[regno].blue;

	return 0;
}

static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
			     u_int transp, struct fb_info *info)
{
	struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;
	volatile struct cmap_regs *cmap_regs = p->cmap_regs;


	if (regno > 255)
		return 1;
	red >>= 8;
	green >>= 8;
	blue >>= 8;
	p->palette[regno].red = red;
	p->palette[regno].green = green;
	p->palette[regno].blue = blue;

	/* tell clut which address to fill */
	out_8(&p->cmap_regs->addr, regno);
	udelay(1);
	/* send one color channel at a time */
	out_8(&cmap_regs->lut, red);
	out_8(&cmap_regs->lut, green);
	out_8(&cmap_regs->lut, blue);

	if (regno < 16) {
#ifdef FBCON_HAS_CFB16
		p->fbcon_cfb16_cmap[regno] = (regno << 10) | (regno << 5) | regno;
#endif
	}

	return 0;
}

static void do_install_cmap(int con, struct fb_info *info)
{
	if (con != currcon)
		return;
	if (fb_display[con].cmap.len) {
		fb_set_cmap(&fb_display[con].cmap, 1, valkyriefb_setcolreg,
			    info);
	}
	else {
		int size = fb_display[con].var.bits_per_pixel == 16 ? 32 : 256;
		fb_set_cmap(fb_default_cmap(size), 1, valkyriefb_setcolreg,
			    info);
	}
}

#ifdef CONFIG_FB_COMPAT_XPMAC
extern struct vc_mode display_info;
extern struct fb_info *console_fb_info;
#endif /* CONFIG_FB_COMPAT_XPMAC */

static int valkyrie_vram_reqd(int video_mode, int color_mode)
{
	int pitch;
	
	if ((pitch = valkyrie_reg_init[video_mode-1]->pitch[color_mode]) == 0)
		pitch = 2 * valkyrie_reg_init[video_mode-1]->pitch[0];
	return valkyrie_reg_init[video_mode-1]->vres * pitch;
}