controlfb.c

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/*
 *  controlfb.c -- frame buffer device for the PowerMac 'control' display
 *
 *  Created 12 July 1998 by Dan Jacobowitz <[e-mail]>
 *  Copyright (C) 1998 Dan Jacobowitz
 *
 *  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/malloc.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>
#include <asm/prom.h>
#include <asm/pgtable.h>

#include <video/fbcon.h>
#include <video/fbcon-cfb8.h>
#include <video/fbcon-cfb16.h>
#include <video/fbcon-cfb32.h>
#include <video/macmodes.h>

#include "controlfb.h"

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

#define DIRTY(z) ((x)->z != (y)->z)
static inline int PAR_EQUAL(struct fb_par_control *x, struct fb_par_control *y)
{
	return (!DIRTY(vmode) && !DIRTY(cmode) && !DIRTY(xres)
		&& !DIRTY(yres) && !DIRTY(vxres) && !DIRTY(vyres)
		&& !DIRTY(xoffset) && !DIRTY(yoffset));
}
static inline int VAR_MATCH(struct fb_var_screeninfo *x, struct fb_var_screeninfo *y)
{
	return (!DIRTY(bits_per_pixel) && !DIRTY(xres)
		&& !DIRTY(yres) && !DIRTY(xres_virtual)
		&& !DIRTY(yres_virtual));
}

struct fb_info_control {
	struct fb_info			info;
/*	struct fb_fix_screeninfo	fix;
	struct fb_var_screeninfo	var;*/
	struct display			display;
	struct fb_par_control		par;
	struct {
		__u8 red, green, blue;
	}			palette[256];
	
	struct cmap_regs	*cmap_regs;
	unsigned long		cmap_regs_phys;
	
	struct control_regs	*control_regs;
	unsigned long		control_regs_phys;
	
	__u8			*frame_buffer;
	unsigned long		frame_buffer_phys;
	
	int			sense, control_use_bank2;
	unsigned long		total_vram;
	union {
#ifdef FBCON_HAS_CFB16
		u16 cfb16[16];
#endif
#ifdef FBCON_HAS_CFB32
		u32 cfb32[16];
#endif
	} fbcon_cmap;
};

/******************** Prototypes for exported functions ********************/
static int control_get_fix(struct fb_fix_screeninfo *fix, int con,
			 struct fb_info *info);
static int control_get_var(struct fb_var_screeninfo *var, int con,
			 struct fb_info *info);
static int control_set_var(struct fb_var_screeninfo *var, int con,
			 struct fb_info *info);
static int control_pan_display(struct fb_var_screeninfo *var, int con,
			     struct fb_info *info);
static int control_get_cmap(struct fb_cmap *cmap, int kspc, int con,
			  struct fb_info *info);
static int control_set_cmap(struct fb_cmap *cmap, int kspc, int con,
			  struct fb_info *info);
static int control_mmap(struct fb_info *info, struct file *file,
                         struct vm_area_struct *vma);


static int controlfb_getcolreg(u_int regno, u_int *red, u_int *green,
			     u_int *blue, u_int *transp, struct fb_info *info);
static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
			     u_int transp, struct fb_info *info);

/******************** Prototypes for internal functions ********************/
static void control_par_to_fix(struct fb_par_control *par, struct fb_fix_screeninfo *fix,
	struct fb_info_control *p);
static void do_install_cmap(int con, struct fb_info *info);
static void control_set_dispsw(struct display *disp, int cmode, struct fb_info_control *p);

/************************* Internal variables *****************************/
static int currcon = 0;
static int par_set = 0;
static char fontname[40] __initdata = { 0 };
static int default_vmode = VMODE_NVRAM;
static int default_cmode = CMODE_NVRAM;

/*
 * Exported functions
 */
int control_init(void);
void control_setup(char *);

static void control_of_init(struct device_node *dp);
static int read_control_sense(struct fb_info_control *p);
static inline int control_vram_reqd(int video_mode, int color_mode);
static void set_control_clock(unsigned char *params);
static void control_set_hardware(struct fb_info_control *p, struct fb_par_control *par);
static inline void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var);
static int control_var_to_par(struct fb_var_screeninfo *var,
	struct fb_par_control *par, const struct fb_info *fb_info);

static void control_init_info(struct fb_info *info, struct fb_info_control *p);
static void control_par_to_display(struct fb_par_control *par,
  struct display *disp, struct fb_fix_screeninfo *fix, struct fb_info_control *p);

static int controlfb_updatevar(int con, struct fb_info *info);

static struct fb_ops controlfb_ops = {
	owner:		THIS_MODULE,
	fb_get_fix:	control_get_fix,
	fb_get_var:	control_get_var,
	fb_set_var:	control_set_var,
	fb_get_cmap:	control_get_cmap,
	fb_set_cmap:	control_set_cmap,
	fb_pan_display:	control_pan_display,
	fb_mmap:	control_mmap,
};



/********************  The functions for controlfb_ops ********************/

#ifdef MODULE
int init_module(void)
{
	struct device_node *dp;

	printk("Loading...\n");
	dp = find_devices("control");
	if (dp != 0)
		control_of_init(dp);
	else
		printk("Failed.\n");
	printk("Done.\n");
}

void cleanup_module(void)
{
	/* FIXME: clean up and release regions */
}
#endif

/*********** Providing our information to the user ************/

static int control_get_fix(struct fb_fix_screeninfo *fix, int con,
			 struct fb_info *info)
{
	struct fb_info_control *p = (struct fb_info_control *) info;

	if(!par_set)
		printk(KERN_ERR "control_get_fix called with unset par!\n");
	if(con == -1) {
		control_par_to_fix(&p->par, fix, p);
	} else {
		struct fb_par_control par;
		
		control_var_to_par(&fb_display[con].var, &par, info);
		control_par_to_fix(&par, fix, p);
	}
	return 0;
}

static int control_get_var(struct fb_var_screeninfo *var, int con,
			 struct fb_info *info)
{
	struct fb_info_control *p = (struct fb_info_control *) info;

	if(!par_set)
		printk(KERN_ERR "control_get_var called with unset par!\n");
	if(con == -1) {
		control_par_to_var(&p->par, var);
	} else {
		*var = fb_display[con].var;
	}
	return 0;
}

/* Sets everything according to var */
/* No longer safe for use in console switching */
static int control_set_var(struct fb_var_screeninfo *var, int con,
			 struct fb_info *info)
{
	struct fb_info_control *p = (struct fb_info_control *) info;
	struct display *disp;
	struct fb_par_control par;
	int depthchange, err;
	int activate = var->activate;

	disp = (con >= 0) ? &fb_display[con] : info->disp;

	if((err = control_var_to_par(var, &par, info))) {
		printk (KERN_ERR "control_set_var: error calling control_var_to_par: %d.\n", err);
		return err;
	}
	
	control_par_to_var(&par, var);
	
	if ((activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
		return 0;

/* I know, we want to use fb_display[con], but grab certain info from p->var instead. */
/* [above no longer true] */
	depthchange = (disp->var.bits_per_pixel != var->bits_per_pixel);
	if(!VAR_MATCH(&disp->var, var)) {
		struct fb_fix_screeninfo	fix;
		control_par_to_fix(&par, &fix, p);
		control_par_to_display(&par, disp, &fix, p);
		if(info->changevar)
			(*info->changevar)(con);
	} else
		disp->var = *var;
	/*p->disp = *disp;*/

	
	if(con == currcon || con == -1) {
		control_set_hardware(p, &par);
	}
	if(depthchange) {
		if((err = fb_alloc_cmap(&disp->cmap, 0, 0)))
			return err;
		do_install_cmap(con, info);
	}
	return 0;
}

static int control_pan_display(struct fb_var_screeninfo *var, int con,
			     struct fb_info *info)
{
	struct fb_info_control *p = (struct fb_info_control *)info;
	struct fb_par_control *par = &p->par;
	
	if (var->xoffset != 0 || var->yoffset+var->yres > var->yres_virtual)
		return -EINVAL;
	fb_display[con].var.yoffset =  par->yoffset = var->yoffset;
	if(con == currcon)
		out_le32(&p->control_regs->start_addr.r,
		    par->yoffset * (par->vxres << par->cmode));
	return 0;
}

static int control_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, controlfb_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 control_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 = disp->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, controlfb_setcolreg, info);
	fb_copy_cmap(cmap, &disp->cmap, kspc ? 0 : 1);
	return 0;
}

/* Private mmap since we want to have a different caching on the framebuffer
 * for controlfb.
 * Note there's no locking in here; it's done in fb_mmap() in fbmem.c.
 */
static int control_mmap(struct fb_info *info, struct file *file,
                       struct vm_area_struct *vma)
{
       struct fb_ops *fb = info->fbops;
       struct fb_fix_screeninfo fix;
       struct fb_var_screeninfo var;
       unsigned long off, start;
       u32 len;

       fb->fb_get_fix(&fix, PROC_CONSOLE(info), info);
       off = vma->vm_pgoff << PAGE_SHIFT;

       /* frame buffer memory */
       start = fix.smem_start;
       len = PAGE_ALIGN((start & ~PAGE_MASK)+fix.smem_len);
       if (off >= len) {
               /* memory mapped io */
               off -= len;
               fb->fb_get_var(&var, PROC_CONSOLE(info), info);
               if (var.accel_flags)
                       return -EINVAL;
               start = fix.mmio_start;
               len = PAGE_ALIGN((start & ~PAGE_MASK)+fix.mmio_len);
               pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE|_PAGE_GUARDED;
       } else {
               /* framebuffer */
               pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
       }
       start &= PAGE_MASK;
       vma->vm_pgoff = off >> PAGE_SHIFT;
       if (io_remap_page_range(vma->vm_start, off,
           vma->vm_end - vma->vm_start, vma->vm_page_prot))
               return -EAGAIN;

       return 0;
}


/********************  End of controlfb_ops implementation  ********************/
/* (new one that is) */


static int controlfb_switch(int con, struct fb_info *info)
{
	struct fb_info_control	*p = (struct fb_info_control *)info;
	struct fb_par_control	par;
	int oldcon = currcon;

	if (fb_display[currcon].cmap.len)
		fb_get_cmap(&fb_display[currcon].cmap, 1, controlfb_getcolreg,
			    info);
	currcon = con;

	control_var_to_par(&fb_display[con].var, &par, info);
	control_set_hardware(p, &par);
	control_set_dispsw(&fb_display[con], par.cmode, p);

	if(fb_display[oldcon].var.yoffset != fb_display[con].var.yoffset)
		controlfb_updatevar(con, info);

	do_install_cmap(con, info);
	return 1;
}

static int controlfb_updatevar(int con, struct fb_info *info)
{
	struct fb_info_control	*p = (struct fb_info_control *)info;

	if(con != currcon)
		return 0;
	/* imsttfb blanks the unused bottom of the screen here...hmm. */
	out_le32(&p->control_regs->start_addr.r,
	    fb_display[con].var.yoffset * fb_display[con].line_length);
	
	return 0;
}

static void controlfb_blank(int blank_mode, struct fb_info *info)
{
/*
 *  Blank the screen if blank_mode != 0, else unblank. If blank == 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