path: root/drivers/video/macfb.c

/*
 * macfb.c: Generic framebuffer for Macs whose colourmaps/modes we
 * don't know how to set.
 *
 * (c) 1999 David Huggins-Daines <dhd@debian.org>
 *
 * Primarily based on vesafb.c, by Gerd Knorr
 * (c) 1998 Gerd Knorr <kraxel@cs.tu-berlin.de>
 *
 * Also uses information and code from:
 *
 * The original macfb.c from Linux/mac68k 2.0, by Alan Cox, Juergen
 * Mellinger, Mikael Forselius, Michael Schmitz, and others.
 *
 * valkyriefb.c, by Martin Costabel, Kevin Schoedel, Barry Nathan, Dan
 * Jacobowitz, Paul Mackerras, Fabio Riccardi, and Geert Uytterhoeven.
 *
 * The VideoToolbox "Bugs" web page at
 * http://rajsky.psych.nyu.edu/Tips/VideoBugs.html
 *
 * This code is free software.  You may copy, modify, and distribute
 * it subject to the terms and conditions of the GNU General Public
 * License, version 2, or any later version, at your convenience.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/nubus.h>
#include <linux/init.h>
#include <linux/fb.h>

#include <asm/setup.h>
#include <asm/bootinfo.h>
#include <asm/macintosh.h>
#include <asm/io.h>

/* Common DAC base address for the LC, RBV, Valkyrie, and IIvx */
#define DAC_BASE 0x50f24000

/* Some addresses for the DAFB */
#define DAFB_BASE 0xf9800200

/* Address for the built-in Civic framebuffer in Quadra AVs */
#define CIVIC_BASE 0x50f30800

/* GSC (Gray Scale Controller) base address */
#define GSC_BASE 0x50F20000

/* CSC (Color Screen Controller) base address */
#define CSC_BASE 0x50F20000

static int (*macfb_setpalette)(unsigned int regno, unsigned int red,
			       unsigned int green, unsigned int blue,
			       struct fb_info *info);

static struct {
	unsigned char addr;
	unsigned char lut;
} __iomem *v8_brazil_cmap_regs;

static struct {
	unsigned char addr;
	char pad1[3]; /* word aligned */
	unsigned char lut;
	char pad2[3]; /* word aligned */
	unsigned char cntl; /* a guess as to purpose */
} __iomem *rbv_cmap_regs;

static struct {
	unsigned long reset;
	unsigned long pad1[3];
	unsigned char pad2[3];
	unsigned char lut;
} __iomem *dafb_cmap_regs;

static struct {
	unsigned char addr;	/* OFFSET: 0x00 */
	unsigned char pad1[15];
	unsigned char lut;	/* OFFSET: 0x10 */
	unsigned char pad2[15];
	unsigned char status;	/* OFFSET: 0x20 */
	unsigned char pad3[7];
	unsigned long vbl_addr;	/* OFFSET: 0x28 */
	unsigned int  status2;	/* OFFSET: 0x2C */
} __iomem *civic_cmap_regs;

static struct {
	char pad1[0x40];
	unsigned char clut_waddr;	/* 0x40 */
	char pad2;
	unsigned char clut_data;	/* 0x42 */
	char pad3[0x3];
	unsigned char clut_raddr;	/* 0x46 */
} __iomem *csc_cmap_regs;

/* The registers in these structs are in NuBus slot space */
struct mdc_cmap_regs {
	char pad1[0x200200];
	unsigned char addr;
	char pad2[6];
	unsigned char lut;
};

struct toby_cmap_regs {
	char pad1[0x90018];
	unsigned char lut; /* TFBClutWDataReg, offset 0x90018 */
	char pad2[3];
	unsigned char addr; /* TFBClutAddrReg, offset 0x9001C */
};

struct jet_cmap_regs {
	char pad1[0xe0e000];
	unsigned char addr;
	unsigned char lut;
};

#define PIXEL_TO_MM(a)	(((a)*10)/28)	/* width in mm at 72 dpi */

static int  video_slot = 0;

static struct fb_var_screeninfo macfb_defined = {
	.bits_per_pixel	= 8,
	.activate	= FB_ACTIVATE_NOW,
	.width		= -1,
	.height		= -1,
	.right_margin	= 32,
	.upper_margin	= 16,
	.lower_margin	= 4,
	.vsync_len	= 4,
	.vmode		= FB_VMODE_NONINTERLACED,
};

static struct fb_fix_screeninfo macfb_fix = {
	.type	= FB_TYPE_PACKED_PIXELS,
	.accel	= FB_ACCEL_NONE,
};

static struct fb_info fb_info;
static u32 pseudo_palette[16];
static int inverse;
static int vidtest;

/*
 * Unlike the Valkyrie, the DAFB cannot set individual colormap
 * registers.  Therefore, we do what the MacOS driver does (no
 * kidding!) and simply set them one by one until we hit the one we
 * want.
 */
static int dafb_setpalette(unsigned int regno, unsigned int red,
			   unsigned int green, unsigned int blue,
			   struct fb_info *info)
{
	static int lastreg = -1;
	unsigned long flags;
	
	red >>= 8;
	green >>= 8;
	blue >>= 8;

	local_irq_save(flags);

	/*
	 * fbdev will set an entire colourmap, but X won't.  Hopefully
	 * this should accommodate both of them
	 */
	if (regno != lastreg + 1) {
		int i;

		/* Stab in the dark trying to reset the CLUT pointer */
		nubus_writel(0, &dafb_cmap_regs->reset);
		nop();

		/* Loop until we get to the register we want */
		for (i = 0; i < regno; i++) {
			nubus_writeb(info->cmap.red[i] >> 8,
				     &dafb_cmap_regs->lut);
			nop();
			nubus_writeb(info->cmap.green[i] >> 8,
				     &dafb_cmap_regs->lut);
			nop();
			nubus_writeb(info->cmap.blue