drivers/video/chipsfb.c - kernel/msm-4.19 - Gitiles

 /*
  *  drivers/video/chipsfb.c -- frame buffer device for
  *  Chips & Technologies 65550 chip.
  *
  *  Copyright (C) 1998-2002 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.
  *
  *  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/init.h>
 #include <linux/pci.h>
 #include <asm/io.h>

 #ifdef CONFIG_PMAC_BACKLIGHT
 #include <asm/backlight.h>
 #endif
 #ifdef CONFIG_PMAC_PBOOK
 #include <linux/adb.h>
 #include <linux/pmu.h>
 #endif

 /*
  * Since we access the display with inb/outb to fixed port numbers,
  * we can only handle one 6555x chip.  -- paulus
  */
 static struct fb_info chipsfb_info;

 #define write_ind(num, val, ap, dp)	do { \
 	outb((num), (ap)); outb((val), (dp)); \
 } while (0)
 #define read_ind(num, var, ap, dp)	do { \
 	outb((num), (ap)); var = inb((dp)); \
 } while (0)

 /* extension registers */
 #define write_xr(num, val)	write_ind(num, val, 0x3d6, 0x3d7)
 #define read_xr(num, var)	read_ind(num, var, 0x3d6, 0x3d7)
 /* flat panel registers */
 #define write_fr(num, val)	write_ind(num, val, 0x3d0, 0x3d1)
 #define read_fr(num, var)	read_ind(num, var, 0x3d0, 0x3d1)
 /* CRTC registers */
 #define write_cr(num, val)	write_ind(num, val, 0x3d4, 0x3d5)
 #define read_cr(num, var)	read_ind(num, var, 0x3d4, 0x3d5)
 /* graphics registers */
 #define write_gr(num, val)	write_ind(num, val, 0x3ce, 0x3cf)
 #define read_gr(num, var)	read_ind(num, var, 0x3ce, 0x3cf)
 /* sequencer registers */
 #define write_sr(num, val)	write_ind(num, val, 0x3c4, 0x3c5)
 #define read_sr(num, var)	read_ind(num, var, 0x3c4, 0x3c5)
 /* attribute registers - slightly strange */
 #define write_ar(num, val)	do { \
 	inb(0x3da); write_ind(num, val, 0x3c0, 0x3c0); \
 } while (0)
 #define read_ar(num, var)	do { \
 	inb(0x3da); read_ind(num, var, 0x3c0, 0x3c1); \
 } while (0)

 #ifdef CONFIG_PMAC_PBOOK
 static unsigned char *save_framebuffer;
 int chips_sleep_notify(struct pmu_sleep_notifier *self, int when);
 static struct pmu_sleep_notifier chips_sleep_notifier = {
 	chips_sleep_notify, SLEEP_LEVEL_VIDEO,
 };
 #endif

 /*
  * Exported functions
  */
 int chips_init(void);

 static int chipsfb_pci_init(struct pci_dev *dp, const struct pci_device_id *);
 static int chipsfb_check_var(struct fb_var_screeninfo *var,
 			     struct fb_info *info);
 static int chipsfb_set_par(struct fb_info *info);
 static int chipsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 			     u_int transp, struct fb_info *info);
 static int chipsfb_blank(int blank, struct fb_info *info);

 static struct fb_ops chipsfb_ops = {
 	.owner		= THIS_MODULE,
 	.fb_check_var	= chipsfb_check_var,
 	.fb_set_par	= chipsfb_set_par,
 	.fb_setcolreg	= chipsfb_setcolreg,
 	.fb_blank	= chipsfb_blank,
 	.fb_fillrect	= cfb_fillrect,
 	.fb_copyarea	= cfb_copyarea,
 	.fb_imageblit	= cfb_imageblit,
 	.fb_cursor	= soft_cursor,
 };

 static int chipsfb_check_var(struct fb_var_screeninfo *var,
 			     struct fb_info *info)
 {
 	if (var->xres > 800 || var->yres > 600
 	    || var->xres_virtual > 800 || var->yres_virtual > 600
 	    || (var->bits_per_pixel != 8 && var->bits_per_pixel != 16)
 	    || var->nonstd
 	    || (var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
 		return -EINVAL;

 	var->xres = var->xres_virtual = 800;
 	var->yres = var->yres_virtual = 600;

 	return 0;
 }

 static int chipsfb_set_par(struct fb_info *info)
 {
 	if (info->var.bits_per_pixel == 16) {
 		write_cr(0x13, 200);		// Set line length (doublewords)
 		write_xr(0x81, 0x14);		// 15 bit (555) color mode
 		write_xr(0x82, 0x00);		// Disable palettes
 		write_xr(0x20, 0x10);		// 16 bit blitter mode

 		info->fix.line_length = 800*2;
 		info->fix.visual = FB_VISUAL_TRUECOLOR;

 		info->var.red.offset = 10;
 		info->var.green.offset = 5;
 		info->var.blue.offset = 0;
 		info->var.red.length = info->var.green.length =
 			info->var.blue.length = 5;

 	} else {
 		/* p->var.bits_per_pixel == 8 */
 		write_cr(0x13, 100);		// Set line length (doublewords)
 		write_xr(0x81, 0x12);		// 8 bit color mode
 		write_xr(0x82, 0x08);		// Graphics gamma enable
 		write_xr(0x20, 0x00);		// 8 bit blitter mode

 		info->fix.line_length = 800;
 		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

  		info->var.red.offset = info->var.green.offset =
 			info->var.blue.offset = 0;
 		info->var.red.length = info->var.green.length =
 			info->var.blue.length = 8;

 	}
 	return 0;
 }

 static int chipsfb_blank(int blank, struct fb_info *info)
 {
 #ifdef CONFIG_PMAC_BACKLIGHT
 	// used to disable backlight only for blank > 1, but it seems
 	// useful at blank = 1 too (saves battery, extends backlight life)
 	set_backlight_enable(!blank);
 #endif /* CONFIG_PMAC_BACKLIGHT */

 	return 1;	/* get fb_blank to set the colormap to all black */
 }

 static int chipsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 			     u_int transp, struct fb_info *info)
 {
 	if (regno > 255)
 		return 1;
 	red >>= 8;
 	green >>= 8;
 	blue >>= 8;
 	outb(regno, 0x3c8);
 	udelay(1);
 	outb(red, 0x3c9);
 	outb(green, 0x3c9);
 	outb(blue, 0x3c9);

 	return 0;
 }

 struct chips_init_reg {
 	unsigned char addr;
 	unsigned char data;
 };

 #define N_ELTS(x)	(sizeof(x) / sizeof(x[0]))

 static struct chips_init_reg chips_init_sr[] = {
 	{ 0x00, 0x03 },
 	{ 0x01, 0x01 },
 	{ 0x02, 0x0f },
 	{ 0x04, 0x0e }
 };

 static struct chips_init_reg chips_init_gr[] = {
 	{ 0x05, 0x00 },
 	{ 0x06, 0x0d },
 	{ 0x08, 0xff }
 };

 static struct chips_init_reg chips_init_ar[] = {
 	{ 0x10, 0x01 },
 	{ 0x12, 0x0f },
 	{ 0x13, 0x00 }
 };

 static struct chips_init_reg chips_init_cr[] = {
 	{ 0x00, 0x7f },
 	{ 0x01, 0x63 },
 	{ 0x02, 0x63 },
 	{ 0x03, 0x83 },
 	{ 0x04, 0x66 },
 	{ 0x05, 0x10 },
 	{ 0x06, 0x72 },
 	{ 0x07, 0x3e },
 	{ 0x08, 0x00 },
 	{ 0x09, 0x40 },
 	{ 0x0c, 0x00 },
 	{ 0x0d, 0x00 },
 	{ 0x10, 0x59 },
 	{ 0x11, 0x0d },
 	{ 0x12, 0x57 },
 	{ 0x13, 0x64 },
 	{ 0x14, 0x00 },
 	{ 0x15, 0x57 },
 	{ 0x16, 0x73 },
 	{ 0x17, 0xe3 },
 	{ 0x18, 0xff },
 	{ 0x30, 0x02 },
 	{ 0x31, 0x02 },
 	{ 0x32, 0x02 },
 	{ 0x33, 0x02 },
 	{ 0x40, 0x00 },
 	{ 0x41, 0x00 },
 	{ 0x40, 0x80 }
 };

 static struct chips_init_reg chips_init_fr[] = {
 	{ 0x01, 0x02 },
 	{ 0x03, 0x08 },
 	{ 0x04, 0x81 },
 	{ 0x05, 0x21 },
 	{ 0x08, 0x0c },
 	{ 0x0a, 0x74 },
 	{ 0x0b, 0x11 },
 	{ 0x10, 0x0c },
 	{ 0x11, 0xe0 },
 	/* { 0x12, 0x40 }, -- 3400 needs 40, 2400 needs 48, no way to tell */
 	{ 0x20, 0x63 },
 	{ 0x21, 0x68 },
 	{ 0x22, 0x19 },
 	{ 0x23, 0x7f },
 	{ 0x24, 0x68 },
 	{ 0x26, 0x00 },
 	{ 0x27, 0x0f },
 	{ 0x30, 0x57 },
 	{ 0x31, 0x58 },
 	{ 0x32, 0x0d },
 	{ 0x33, 0x72 },
 	{ 0x34, 0x02 },
 	{ 0x35, 0x22 },
 	{ 0x36, 0x02 },
 	{ 0x37, 0x00 }
 };

 static struct chips_init_reg chips_init_xr[] = {
 	{ 0xce, 0x00 },		/* set default memory clock */
 	{ 0xcc, 0x43 },		/* memory clock ratio */
 	{ 0xcd, 0x18 },
 	{ 0xce, 0xa1 },
 	{ 0xc8, 0x84 },
 	{ 0xc9, 0x0a },
 	{ 0xca, 0x00 },
 	{ 0xcb, 0x20 },
 	{ 0xcf, 0x06 },
 	{ 0xd0, 0x0e },
 	{ 0x09, 0x01 },
 	{ 0x0a, 0x02 },
 	{ 0x0b, 0x01 },
 	{ 0x20, 0x00 },
 	{ 0x40, 0x03 },
 	{ 0x41, 0x01 },
 	{ 0x42, 0x00 },
 	{ 0x80, 0x82 },
 	{ 0x81, 0x12 },
 	{ 0x82, 0x08 },
 	{ 0xa0, 0x00 },
 	{ 0xa8, 0x00 }
 };

 static void __init chips_hw_init(void)
 {
 	int i;

 	for (i = 0; i < N_ELTS(chips_init_xr); ++i)
 		write_xr(chips_init_xr[i].addr, chips_init_xr[i].data);
 	outb(0x29, 0x3c2); /* set misc output reg */
 	for (i = 0; i < N_ELTS(chips_init_sr); ++i)
 		write_sr(chips_init_sr[i].addr, chips_init_sr[i].data);
 	for (i = 0; i < N_ELTS(chips_init_gr); ++i)
 		write_gr(chips_init_gr[i].addr, chips_init_gr[i].data);
 	for (i = 0; i < N_ELTS(chips_init_ar); ++i)
 		write_ar(chips_init_ar[i].addr, chips_init_ar[i].data);
 	for (i = 0; i < N_ELTS(chips_init_cr); ++i)
 		write_cr(chips_init_cr[i].addr, chips_init_cr[i].data);
 	for (i = 0; i < N_ELTS(chips_init_fr); ++i)
 		write_fr(chips_init_fr[i].addr, chips_init_fr[i].data);
 }

 static struct fb_fix_screeninfo chipsfb_fix __initdata = {
 	.id =		"C&T 65550",
 	.type =		FB_TYPE_PACKED_PIXELS,
 	.visual =	FB_VISUAL_PSEUDOCOLOR,
 	.accel =	FB_ACCEL_NONE,
 	.line_length =	800,

 // FIXME: Assumes 1MB frame buffer, but 65550 supports 1MB or 2MB.
 // * "3500" PowerBook G3 (the original PB G3) has 2MB.
 // * 2400 has 1MB composed of 2 Mitsubishi M5M4V4265CTP DRAM chips.
 //   Motherboard actually supports 2MB -- there are two blank locations
 //   for a second pair of DRAMs.  (Thanks, Apple!)
 // * 3400 has 1MB (I think).  Don't know if it's expandable.
 // -- Tim Seufert
 	.smem_len =	0x100000,	/* 1MB */
 };

 static struct fb_var_screeninfo chipsfb_var __initdata = {
 	.xres = 800,
 	.yres = 600,
 	.xres_virtual = 800,
 	.yres_virtual = 600,
 	.bits_per_pixel = 8,
 	.red = { .length = 8 },
 	.green = { .length = 8 },
 	.blue = { .length = 8 },
 	.height = -1,
 	.width = -1,
 	.vmode = FB_VMODE_NONINTERLACED,
 	.pixclock = 10000,
 	.left_margin = 16,
 	.right_margin = 16,
 	.upper_margin = 16,
 	.lower_margin = 16,
 	.hsync_len = 8,
 	.vsync_len = 8,
 };

 static void __init init_chips(struct fb_info *p, unsigned long addr)
 {
 	p->fix = chipsfb_fix;
 	p->fix.smem_start = addr;

 	p->var = chipsfb_var;

 	p->fbops = &chipsfb_ops;
 	p->flags = FBINFO_DEFAULT;

 	fb_alloc_cmap(&p->cmap, 256, 0);

 	if (register_framebuffer(p) < 0) {
 		printk(KERN_ERR "C&T 65550 framebuffer failed to register\n");
 		return;
 	}

 	printk(KERN_INFO "fb%d: Chips 65550 frame buffer (%dK RAM detected)\n",
 		p->node, p->fix.smem_len / 1024);

 	chips_hw_init();
 }

 static int __devinit
 chipsfb_pci_init(struct pci_dev *dp, const struct pci_device_id *ent)
 {
 	struct fb_info *p = &chipsfb_info;
 	unsigned long addr, size;
 	unsigned short cmd;

 	if ((dp->resource[0].flags & IORESOURCE_MEM) == 0)
 		return -ENODEV;
 	addr = pci_resource_start(dp, 0);
 	size = pci_resource_len(dp, 0);
 	if (addr == 0)
 		return -ENODEV;
 	if (p->screen_base != 0)
 		return -EBUSY;
 	if (!request_mem_region(addr, size, "chipsfb"))
 		return -EBUSY;

 #ifdef __BIG_ENDIAN
 	addr += 0x800000;	// Use big-endian aperture
 #endif

 	/* we should use pci_enable_device here, but,
 	   the device doesn't declare its I/O ports in its BARs
 	   so pci_enable_device won't turn on I/O responses */
 	pci_read_config_word(dp, PCI_COMMAND, &cmd);
 	cmd |= 3;	/* enable memory and IO space */
 	pci_write_config_word(dp, PCI_COMMAND, cmd);

 #ifdef CONFIG_PMAC_BACKLIGHT
 	/* turn on the backlight */
 	set_backlight_enable(1);
 #endif /* CONFIG_PMAC_BACKLIGHT */

 	p->screen_base = __ioremap(addr, 0x200000, _PAGE_NO_CACHE);
 	if (p->screen_base == NULL) {
 		release_mem_region(addr, size);
 		return -ENOMEM;
 	}
 	p->device = &dp->dev;
 	init_chips(p, addr);

 #ifdef CONFIG_PMAC_PBOOK
 	pmu_register_sleep_notifier(&chips_sleep_notifier);
 #endif /* CONFIG_PMAC_PBOOK */

 	/* Clear the entire framebuffer */
 	memset(p->screen_base, 0, 0x100000);

 	pci_set_drvdata(dp, p);
 	return 0;
 }

 static void __devexit chipsfb_remove(struct pci_dev *dp)
 {
 	struct fb_info *p = pci_get_drvdata(dp);

 	if (p != &chipsfb_info || p->screen_base == NULL)
 		return;
 	unregister_framebuffer(p);
 	iounmap(p->screen_base);
 	p->screen_base = NULL;
 	release_mem_region(pci_resource_start(dp, 0), pci_resource_len(dp, 0));

 #ifdef CONFIG_PMAC_PBOOK
 	pmu_unregister_sleep_notifier(&chips_sleep_notifier);
 #endif /* CONFIG_PMAC_PBOOK */
 }

 static struct pci_device_id chipsfb_pci_tbl[] = {
 	{ PCI_VENDOR_ID_CT, PCI_DEVICE_ID_CT_65550, PCI_ANY_ID, PCI_ANY_ID },
 	{ 0 }
 };

 MODULE_DEVICE_TABLE(pci, chipsfb_pci_tbl);

 static struct pci_driver chipsfb_driver = {
 	.name =		"chipsfb",
 	.id_table =	chipsfb_pci_tbl,
 	.probe =	chipsfb_pci_init,
 	.remove =	__devexit_p(chipsfb_remove),
 };

 int __init chips_init(void)
 {
 	if (fb_get_options("chipsfb", NULL))
 		return -ENODEV;

 	return pci_register_driver(&chipsfb_driver);
 }

 module_init(chips_init);

 static void __exit chipsfb_exit(void)
 {
 	pci_unregister_driver(&chipsfb_driver);
 }

 #ifdef CONFIG_PMAC_PBOOK
 /*
  * Save the contents of the frame buffer when we go to sleep,
  * and restore it when we wake up again.
  */
 int
 chips_sleep_notify(struct pmu_sleep_notifier *self, int when)
 {
 	struct fb_info *p = &chipsfb_info;
 	int nb = p->var.yres * p->fix.line_length;

 	if (p->screen_base == NULL)
 		return PBOOK_SLEEP_OK;

 	switch (when) {
 	case PBOOK_SLEEP_REQUEST:
 		save_framebuffer = vmalloc(nb);
 		if (save_framebuffer == NULL)
 			return PBOOK_SLEEP_REFUSE;
 		break;
 	case PBOOK_SLEEP_REJECT:
 		if (save_framebuffer) {
 			vfree(save_framebuffer);
 			save_framebuffer = NULL;
 		}
 		break;
 	case PBOOK_SLEEP_NOW:
 		chipsfb_blank(1, p);
 		if (save_framebuffer)
 			memcpy(save_framebuffer, p->screen_base, nb);
 		break;
 	case PBOOK_WAKE:
 		if (save_framebuffer) {
 			memcpy(p->screen_base, save_framebuffer, nb);
 			vfree(save_framebuffer);
 			save_framebuffer = NULL;
 		}
 		chipsfb_blank(0, p);
 		break;
 	}
 	return PBOOK_SLEEP_OK;
 }
 #endif /* CONFIG_PMAC_PBOOK */

 MODULE_LICENSE("GPL");
	/*
	* drivers/video/chipsfb.c -- frame buffer device for
	* Chips & Technologies 65550 chip.
	*
	* Copyright (C) 1998-2002 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.
	*
	* 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/init.h>
	#include <linux/pci.h>
	#include <asm/io.h>

	#ifdef CONFIG_PMAC_BACKLIGHT
	#include <asm/backlight.h>
	#endif
	#ifdef CONFIG_PMAC_PBOOK
	#include <linux/adb.h>
	#include <linux/pmu.h>
	#endif

	/*
	* Since we access the display with inb/outb to fixed port numbers,
	* we can only handle one 6555x chip. -- paulus
	*/
	static struct fb_info chipsfb_info;

	#define write_ind(num, val, ap, dp) do { \
	outb((num), (ap)); outb((val), (dp)); \
	} while (0)
	#define read_ind(num, var, ap, dp) do { \
	outb((num), (ap)); var = inb((dp)); \
	} while (0)

	/* extension registers */
	#define write_xr(num, val) write_ind(num, val, 0x3d6, 0x3d7)
	#define read_xr(num, var) read_ind(num, var, 0x3d6, 0x3d7)
	/* flat panel registers */
	#define write_fr(num, val) write_ind(num, val, 0x3d0, 0x3d1)
	#define read_fr(num, var) read_ind(num, var, 0x3d0, 0x3d1)
	/* CRTC registers */
	#define write_cr(num, val) write_ind(num, val, 0x3d4, 0x3d5)
	#define read_cr(num, var) read_ind(num, var, 0x3d4, 0x3d5)
	/* graphics registers */
	#define write_gr(num, val) write_ind(num, val, 0x3ce, 0x3cf)
	#define read_gr(num, var) read_ind(num, var, 0x3ce, 0x3cf)
	/* sequencer registers */
	#define write_sr(num, val) write_ind(num, val, 0x3c4, 0x3c5)
	#define read_sr(num, var) read_ind(num, var, 0x3c4, 0x3c5)
	/* attribute registers - slightly strange */
	#define write_ar(num, val) do { \
	inb(0x3da); write_ind(num, val, 0x3c0, 0x3c0); \
	} while (0)
	#define read_ar(num, var) do { \
	inb(0x3da); read_ind(num, var, 0x3c0, 0x3c1); \
	} while (0)

	#ifdef CONFIG_PMAC_PBOOK
	static unsigned char *save_framebuffer;
	int chips_sleep_notify(struct pmu_sleep_notifier *self, int when);
	static struct pmu_sleep_notifier chips_sleep_notifier = {
	chips_sleep_notify, SLEEP_LEVEL_VIDEO,
	};
	#endif

	/*
	* Exported functions
	*/
	int chips_init(void);

	static int chipsfb_pci_init(struct pci_dev dp, const struct pci_device_id );
	static int chipsfb_check_var(struct fb_var_screeninfo *var,
	struct fb_info *info);
	static int chipsfb_set_par(struct fb_info *info);
	static int chipsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
	u_int transp, struct fb_info *info);
	static int chipsfb_blank(int blank, struct fb_info *info);

	static struct fb_ops chipsfb_ops = {
	.owner = THIS_MODULE,
	.fb_check_var = chipsfb_check_var,
	.fb_set_par = chipsfb_set_par,
	.fb_setcolreg = chipsfb_setcolreg,
	.fb_blank = chipsfb_blank,
	.fb_fillrect = cfb_fillrect,
	.fb_copyarea = cfb_copyarea,
	.fb_imageblit = cfb_imageblit,
	.fb_cursor = soft_cursor,
	};

	static int chipsfb_check_var(struct fb_var_screeninfo *var,
	struct fb_info *info)
	{
	if (var->xres > 800 \|\| var->yres > 600
	\|\| var->xres_virtual > 800 \|\| var->yres_virtual > 600
	\|\| (var->bits_per_pixel != 8 && var->bits_per_pixel != 16)
	\|\| var->nonstd
	\|\| (var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
	return -EINVAL;

	var->xres = var->xres_virtual = 800;
	var->yres = var->yres_virtual = 600;

	return 0;
	}

	static int chipsfb_set_par(struct fb_info *info)
	{
	if (info->var.bits_per_pixel == 16) {
	write_cr(0x13, 200); // Set line length (doublewords)
	write_xr(0x81, 0x14); // 15 bit (555) color mode
	write_xr(0x82, 0x00); // Disable palettes
	write_xr(0x20, 0x10); // 16 bit blitter mode

	info->fix.line_length = 800*2;
	info->fix.visual = FB_VISUAL_TRUECOLOR;

	info->var.red.offset = 10;
	info->var.green.offset = 5;
	info->var.blue.offset = 0;
	info->var.red.length = info->var.green.length =
	info->var.blue.length = 5;

	} else {
	/* p->var.bits_per_pixel == 8 */
	write_cr(0x13, 100); // Set line length (doublewords)
	write_xr(0x81, 0x12); // 8 bit color mode
	write_xr(0x82, 0x08); // Graphics gamma enable
	write_xr(0x20, 0x00); // 8 bit blitter mode

	info->fix.line_length = 800;
	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

	info->var.red.offset = info->var.green.offset =
	info->var.blue.offset = 0;
	info->var.red.length = info->var.green.length =
	info->var.blue.length = 8;

	}
	return 0;
	}

	static int chipsfb_blank(int blank, struct fb_info *info)
	{
	#ifdef CONFIG_PMAC_BACKLIGHT
	// used to disable backlight only for blank > 1, but it seems
	// useful at blank = 1 too (saves battery, extends backlight life)
	set_backlight_enable(!blank);
	#endif /* CONFIG_PMAC_BACKLIGHT */

	return 1; /* get fb_blank to set the colormap to all black */
	}

	static int chipsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
	u_int transp, struct fb_info *info)
	{
	if (regno > 255)
	return 1;
	red >>= 8;
	green >>= 8;
	blue >>= 8;
	outb(regno, 0x3c8);
	udelay(1);
	outb(red, 0x3c9);
	outb(green, 0x3c9);
	outb(blue, 0x3c9);

	return 0;
	}

	struct chips_init_reg {
	unsigned char addr;
	unsigned char data;
	};

	#define N_ELTS(x) (sizeof(x) / sizeof(x[0]))

	static struct chips_init_reg chips_init_sr[] = {
	{ 0x00, 0x03 },
	{ 0x01, 0x01 },
	{ 0x02, 0x0f },
	{ 0x04, 0x0e }
	};

	static struct chips_init_reg chips_init_gr[] = {
	{ 0x05, 0x00 },
	{ 0x06, 0x0d },
	{ 0x08, 0xff }
	};

	static struct chips_init_reg chips_init_ar[] = {
	{ 0x10, 0x01 },
	{ 0x12, 0x0f },
	{ 0x13, 0x00 }
	};

	static struct chips_init_reg chips_init_cr[] = {
	{ 0x00, 0x7f },
	{ 0x01, 0x63 },
	{ 0x02, 0x63 },
	{ 0x03, 0x83 },
	{ 0x04, 0x66 },
	{ 0x05, 0x10 },
	{ 0x06, 0x72 },
	{ 0x07, 0x3e },
	{ 0x08, 0x00 },
	{ 0x09, 0x40 },
	{ 0x0c, 0x00 },
	{ 0x0d, 0x00 },
	{ 0x10, 0x59 },
	{ 0x11, 0x0d },
	{ 0x12, 0x57 },
	{ 0x13, 0x64 },
	{ 0x14, 0x00 },
	{ 0x15, 0x57 },
	{ 0x16, 0x73 },
	{ 0x17, 0xe3 },
	{ 0x18, 0xff },
	{ 0x30, 0x02 },
	{ 0x31, 0x02 },
	{ 0x32, 0x02 },
	{ 0x33, 0x02 },
	{ 0x40, 0x00 },
	{ 0x41, 0x00 },
	{ 0x40, 0x80 }
	};

	static struct chips_init_reg chips_init_fr[] = {
	{ 0x01, 0x02 },
	{ 0x03, 0x08 },
	{ 0x04, 0x81 },
	{ 0x05, 0x21 },
	{ 0x08, 0x0c },
	{ 0x0a, 0x74 },
	{ 0x0b, 0x11 },
	{ 0x10, 0x0c },
	{ 0x11, 0xe0 },
	/* { 0x12, 0x40 }, -- 3400 needs 40, 2400 needs 48, no way to tell */
	{ 0x20, 0x63 },
	{ 0x21, 0x68 },
	{ 0x22, 0x19 },
	{ 0x23, 0x7f },
	{ 0x24, 0x68 },
	{ 0x26, 0x00 },
	{ 0x27, 0x0f },
	{ 0x30, 0x57 },
	{ 0x31, 0x58 },
	{ 0x32, 0x0d },
	{ 0x33, 0x72 },
	{ 0x34, 0x02 },
	{ 0x35, 0x22 },
	{ 0x36, 0x02 },
	{ 0x37, 0x00 }
	};

	static struct chips_init_reg chips_init_xr[] = {
	{ 0xce, 0x00 }, /* set default memory clock */
	{ 0xcc, 0x43 }, /* memory clock ratio */
	{ 0xcd, 0x18 },
	{ 0xce, 0xa1 },
	{ 0xc8, 0x84 },
	{ 0xc9, 0x0a },
	{ 0xca, 0x00 },
	{ 0xcb, 0x20 },
	{ 0xcf, 0x06 },
	{ 0xd0, 0x0e },
	{ 0x09, 0x01 },
	{ 0x0a, 0x02 },
	{ 0x0b, 0x01 },
	{ 0x20, 0x00 },
	{ 0x40, 0x03 },
	{ 0x41, 0x01 },
	{ 0x42, 0x00 },
	{ 0x80, 0x82 },
	{ 0x81, 0x12 },
	{ 0x82, 0x08 },
	{ 0xa0, 0x00 },
	{ 0xa8, 0x00 }
	};

	static void __init chips_hw_init(void)
	{
	int i;

	for (i = 0; i < N_ELTS(chips_init_xr); ++i)
	write_xr(chips_init_xr[i].addr, chips_init_xr[i].data);
	outb(0x29, 0x3c2); /* set misc output reg */
	for (i = 0; i < N_ELTS(chips_init_sr); ++i)
	write_sr(chips_init_sr[i].addr, chips_init_sr[i].data);
	for (i = 0; i < N_ELTS(chips_init_gr); ++i)
	write_gr(chips_init_gr[i].addr, chips_init_gr[i].data);
	for (i = 0; i < N_ELTS(chips_init_ar); ++i)
	write_ar(chips_init_ar[i].addr, chips_init_ar[i].data);
	for (i = 0; i < N_ELTS(chips_init_cr); ++i)
	write_cr(chips_init_cr[i].addr, chips_init_cr[i].data);
	for (i = 0; i < N_ELTS(chips_init_fr); ++i)
	write_fr(chips_init_fr[i].addr, chips_init_fr[i].data);
	}

	static struct fb_fix_screeninfo chipsfb_fix __initdata = {
	.id = "C&T 65550",
	.type = FB_TYPE_PACKED_PIXELS,
	.visual = FB_VISUAL_PSEUDOCOLOR,
	.accel = FB_ACCEL_NONE,
	.line_length = 800,

	// FIXME: Assumes 1MB frame buffer, but 65550 supports 1MB or 2MB.
	// * "3500" PowerBook G3 (the original PB G3) has 2MB.
	// * 2400 has 1MB composed of 2 Mitsubishi M5M4V4265CTP DRAM chips.
	// Motherboard actually supports 2MB -- there are two blank locations
	// for a second pair of DRAMs. (Thanks, Apple!)
	// * 3400 has 1MB (I think). Don't know if it's expandable.
	// -- Tim Seufert
	.smem_len = 0x100000, /* 1MB */
	};

	static struct fb_var_screeninfo chipsfb_var __initdata = {
	.xres = 800,
	.yres = 600,
	.xres_virtual = 800,
	.yres_virtual = 600,
	.bits_per_pixel = 8,
	.red = { .length = 8 },
	.green = { .length = 8 },
	.blue = { .length = 8 },
	.height = -1,
	.width = -1,
	.vmode = FB_VMODE_NONINTERLACED,
	.pixclock = 10000,
	.left_margin = 16,
	.right_margin = 16,
	.upper_margin = 16,
	.lower_margin = 16,
	.hsync_len = 8,
	.vsync_len = 8,
	};

	static void __init init_chips(struct fb_info *p, unsigned long addr)
	{
	p->fix = chipsfb_fix;
	p->fix.smem_start = addr;

	p->var = chipsfb_var;

	p->fbops = &chipsfb_ops;
	p->flags = FBINFO_DEFAULT;

	fb_alloc_cmap(&p->cmap, 256, 0);

	if (register_framebuffer(p) < 0) {
	printk(KERN_ERR "C&T 65550 framebuffer failed to register\n");
	return;
	}

	printk(KERN_INFO "fb%d: Chips 65550 frame buffer (%dK RAM detected)\n",
	p->node, p->fix.smem_len / 1024);

	chips_hw_init();
	}

	static int __devinit
	chipsfb_pci_init(struct pci_dev dp, const struct pci_device_id ent)
	{
	struct fb_info *p = &chipsfb_info;
	unsigned long addr, size;
	unsigned short cmd;

	if ((dp->resource[0].flags & IORESOURCE_MEM) == 0)
	return -ENODEV;
	addr = pci_resource_start(dp, 0);
	size = pci_resource_len(dp, 0);
	if (addr == 0)
	return -ENODEV;
	if (p->screen_base != 0)
	return -EBUSY;
	if (!request_mem_region(addr, size, "chipsfb"))
	return -EBUSY;

	#ifdef __BIG_ENDIAN
	addr += 0x800000; // Use big-endian aperture
	#endif

	/* we should use pci_enable_device here, but,
	the device doesn't declare its I/O ports in its BARs
	so pci_enable_device won't turn on I/O responses */
	pci_read_config_word(dp, PCI_COMMAND, &cmd);
	cmd \|= 3; /* enable memory and IO space */
	pci_write_config_word(dp, PCI_COMMAND, cmd);

	#ifdef CONFIG_PMAC_BACKLIGHT
	/* turn on the backlight */
	set_backlight_enable(1);
	#endif /* CONFIG_PMAC_BACKLIGHT */

	p->screen_base = __ioremap(addr, 0x200000, _PAGE_NO_CACHE);
	if (p->screen_base == NULL) {
	release_mem_region(addr, size);
	return -ENOMEM;
	}
	p->device = &dp->dev;
	init_chips(p, addr);

	#ifdef CONFIG_PMAC_PBOOK
	pmu_register_sleep_notifier(&chips_sleep_notifier);
	#endif /* CONFIG_PMAC_PBOOK */

	/* Clear the entire framebuffer */
	memset(p->screen_base, 0, 0x100000);

	pci_set_drvdata(dp, p);
	return 0;
	}

	static void __devexit chipsfb_remove(struct pci_dev *dp)
	{
	struct fb_info *p = pci_get_drvdata(dp);

	if (p != &chipsfb_info \|\| p->screen_base == NULL)
	return;
	unregister_framebuffer(p);
	iounmap(p->screen_base);
	p->screen_base = NULL;
	release_mem_region(pci_resource_start(dp, 0), pci_resource_len(dp, 0));

	#ifdef CONFIG_PMAC_PBOOK
	pmu_unregister_sleep_notifier(&chips_sleep_notifier);
	#endif /* CONFIG_PMAC_PBOOK */
	}

	static struct pci_device_id chipsfb_pci_tbl[] = {
	{ PCI_VENDOR_ID_CT, PCI_DEVICE_ID_CT_65550, PCI_ANY_ID, PCI_ANY_ID },
	{ 0 }
	};

	MODULE_DEVICE_TABLE(pci, chipsfb_pci_tbl);

	static struct pci_driver chipsfb_driver = {
	.name = "chipsfb",
	.id_table = chipsfb_pci_tbl,
	.probe = chipsfb_pci_init,
	.remove = __devexit_p(chipsfb_remove),
	};

	int __init chips_init(void)
	{
	if (fb_get_options("chipsfb", NULL))
	return -ENODEV;

	return pci_register_driver(&chipsfb_driver);
	}

	module_init(chips_init);

	static void __exit chipsfb_exit(void)
	{
	pci_unregister_driver(&chipsfb_driver);
	}

	#ifdef CONFIG_PMAC_PBOOK
	/*
	* Save the contents of the frame buffer when we go to sleep,
	* and restore it when we wake up again.
	*/
	int
	chips_sleep_notify(struct pmu_sleep_notifier *self, int when)
	{
	struct fb_info *p = &chipsfb_info;
	int nb = p->var.yres * p->fix.line_length;

	if (p->screen_base == NULL)
	return PBOOK_SLEEP_OK;

	switch (when) {
	case PBOOK_SLEEP_REQUEST:
	save_framebuffer = vmalloc(nb);
	if (save_framebuffer == NULL)
	return PBOOK_SLEEP_REFUSE;
	break;
	case PBOOK_SLEEP_REJECT:
	if (save_framebuffer) {
	vfree(save_framebuffer);
	save_framebuffer = NULL;
	}
	break;
	case PBOOK_SLEEP_NOW:
	chipsfb_blank(1, p);
	if (save_framebuffer)
	memcpy(save_framebuffer, p->screen_base, nb);
	break;
	case PBOOK_WAKE:
	if (save_framebuffer) {
	memcpy(p->screen_base, save_framebuffer, nb);
	vfree(save_framebuffer);
	save_framebuffer = NULL;
	}
	chipsfb_blank(0, p);
	break;
	}
	return PBOOK_SLEEP_OK;
	}
	#endif /* CONFIG_PMAC_PBOOK */

	MODULE_LICENSE("GPL");