[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / video / arcfb.c

/*
 * linux/drivers/video/arcfb.c -- FB driver for Arc monochrome LCD board
 *
 * Copyright (C) 2005, Jaya Kumar <jayalk@intworks.biz>
 * http://www.intworks.biz/arclcd
 *
 * 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.
 *
 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
 *
 * This driver was written to be used with the Arc LCD board. Arc uses a
 * set of KS108 chips that control individual 64x64 LCD matrices. The board
 * can be paneled in a variety of setups such as 2x1=128x64, 4x4=256x256 and
 * so on. The interface between the board and the host is TTL based GPIO. The
 * GPIO requirements are 8 writable data lines and 4+n lines for control. On a
 * GPIO-less system, the board can be tested by connecting the respective sigs
 * up to a parallel port connector. The driver requires the IO addresses for
 * data and control GPIO at load time. It is unable to probe for the
 * existence of the LCD so it must be told at load time whether it should
 * be enabled or not.
 *
 * Todo:
 * - testing with 4x4
 * - testing with interrupt hw
 *
 * General notes:
 * - User must set tuhold. It's in microseconds. According to the 108 spec,
 *   the hold time is supposed to be at least 1 microsecond.
 * - User must set num_cols=x num_rows=y, eg: x=2 means 128
 * - User must set arcfb_enable=1 to enable it
 * - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR
 *
 */

#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/arcfb.h>

#include <asm/uaccess.h>

#define floor8(a) (a&(~0x07))
#define floorXres(a,xres) (a&(~(xres - 1)))
#define iceil8(a) (((int)((a+7)/8))*8)
#define ceil64(a) (a|0x3F)
#define ceilXres(a,xres) (a|(xres - 1))

/* ks108 chipset specific defines and code */

#define KS_SET_DPY_START_LINE 	0xC0
#define KS_SET_PAGE_NUM 	0xB8
#define KS_SET_X 		0x40
#define KS_CEHI 		0x01
#define KS_CELO 		0x00
#define KS_SEL_CMD 		0x08
#define KS_SEL_DATA 		0x00
#define KS_DPY_ON 		0x3F
#define KS_DPY_OFF 		0x3E
#define KS_INTACK 		0x40
#define KS_CLRINT		0x02

struct arcfb_par {
	unsigned long dio_addr;
	unsigned long cio_addr;
	unsigned long c2io_addr;
	atomic_t ref_count;
	unsigned char cslut[9];
	struct fb_info *info;
	unsigned int irq;
	spinlock_t lock;
};

static struct fb_fix_screeninfo arcfb_fix __initdata = {
	.id =		"arcfb",
	.type =		FB_TYPE_PACKED_PIXELS,
	.visual =	FB_VISUAL_MONO01,
	.xpanstep =	0,
	.ypanstep =	1,
	.ywrapstep =	0,
	.accel =	FB_ACCEL_NONE,
};

static struct fb_var_screeninfo arcfb_var __initdata = {
	.xres		= 128,
	.yres		= 64,
	.xres_virtual	= 128,
	.yres_virtual	= 64,
	.bits_per_pixel	= 1,
	.nonstd		= 1,
};

static unsigned long num_cols;
static unsigned long num_rows;
static unsigned long dio_addr;
static unsigned long cio_addr;
static unsigned long c2io_addr;
static unsigned long splashval;
static unsigned long tuhold;
static unsigned int nosplash;
static unsigned int arcfb_enable;
static unsigned int irq;

static DECLARE_WAIT_QUEUE_HEAD(arcfb_waitq);

static void ks108_writeb_ctl(struct arcfb_par *par,
				unsigned int chipindex, unsigned char value)
{
	unsigned char chipselval = par->cslut[chipindex];

	outb(chipselval|KS_CEHI|KS_SEL_CMD, par->cio_addr);
	outb(value, par->dio_addr);
	udelay(tuhold);
	outb(chipselval|KS_CELO|KS_SEL_CMD, par->cio_addr);
}

static void ks108_writeb_mainctl(struct arcfb_par *par, unsigned char value)
{

	outb(value, par->cio_addr);
	udelay(tuhold);
}

static unsigned char ks108_readb_ctl2(struct arcfb_par *par)
{
	return inb(par->c2io_addr);
}

static void ks108_writeb_data(struct arcfb_par *par,
				unsigned int chipindex, unsigned char value)
{
	unsigned char chipselval = par->cslut[chipindex];

	outb(chipselval|KS_CEHI|KS_SEL_DATA, par->cio_addr);
	outb(value, par->dio_addr);
	udelay(tuhold);
	outb(chipselval|KS_CELO|KS_SEL_DATA, par->cio_addr);
}

static void ks108_set_start_line(struct arcfb_par *par,
				unsigned int chipindex, unsigned char y)
{
	ks108_writeb_ctl(par, chipindex, KS_SET_DPY_START_LINE|y);
}

static void ks108_set_yaddr(struct arcfb_par *par,
				unsigned int chipindex, unsigned char y)
{
	ks108_writeb_ctl(par, chipindex, KS_SET_PAGE_NUM|y);
}

static void ks108_set_xaddr(struct arcfb_par *par,
				unsigned int chipindex, unsigned char x)
{
	ks108_writeb_ctl(par, chipindex, KS_SET_X|x);
}

static void ks108_clear_lcd(struct arcfb_par *par, unsigned int chipindex)
{
	int i,j;

	for (i = 0; i <= 8; i++) {
		ks108_set_yaddr(par, chipindex, i);
		ks108_set_xaddr(par, chipindex, 0);
		for (j = 0; j < 64; j++) {
			ks108_writeb_data(par, chipindex,
				(unsigned char) splashval);
		}
	}
}

/* main arcfb functions */

static int arcfb_open(struct fb_info *info, int user)
{
	struct arcfb_par *par = info->par;

	atomic_inc(&par->ref_count);
	return 0;
}

static int arcfb_release(struct fb_info *info, int user)
{
	struct arcfb_par *par = info->par;
	int count = atomic_read(&par->ref_count);

	if (!count)
		return -EINVAL;
	atomic_dec(&par->ref_count);
	return 0;
}

static int arcfb_pan_display(struct fb_var_screeninfo *var,
				struct fb_info *info)
{
	int i;
	struct arcfb_par *par = info->par;

	if ((var->vmode & FB_VMODE_YWRAP) && (var->yoffset < 64)
		&& (info->var.yres <= 64)) {
		for (i = 0; i < num_cols; i++) {
			ks108_set_start_line(par, i, var->yoffset);
		}
		info->var.yoffset = var->yoffset;
		return 0;
	}

	return -EINVAL;
}

static irqreturn_t arcfb_interrupt(int vec, void *dev_instance,
		struct pt_regs *regs)
{
	struct fb_info *info = dev_instance;
	unsigned char ctl2status;
	struct arcfb_par *par = info->par;

	ctl2status = ks108_readb_ctl2(par);

	if (!(ctl2status & KS_INTACK)) /* not arc generated interrupt */
		return IRQ_NONE;

	ks108_writeb_mainctl(par, KS_CLRINT);

	spin_lock(&par->lock);
        if (waitqueue_active(&arcfb_waitq)) {
                wake_up(&arcfb_waitq);
        }
	spin_unlock(&par->lock);

	return IRQ_HANDLED;
}

/*
 * here we handle a specific page on the lcd. the complexity comes from
 * the fact that the fb is laidout in 8xX vertical columns. we extract
 * each write of 8 vertical pixels. then we shift out as we move along
 * X. That's what rightshift does. bitmask selects the desired input bit.
 */
static void arcfb_lcd_update_page(struct arcfb_par *par, unsigned int upper,
		unsigned int left, unsigned int right, unsigned int distance)
{
	unsigned char *src;
	unsigned int xindex, yindex, chipindex, linesize;
	int i, count;
	unsigned char val;
	unsigned char bitmask, rightshift;

	xindex = left >> 6;
	yindex = upper >> 6;
	chipindex = (xindex + (yindex*num_cols));

	ks108_set_yaddr(par, chipindex, upper/8);

	linesize = par->info->var.xres/8;
	src = par->info->screen_base + (left/8) + (upper * linesize);
	ks108_set_xaddr(par, chipindex, left);

	bitmask=1;
	rightshift=0;
	while (left <= right) {
		val = 0;
		for (i = 0; i < 8; i++) {
			if ( i > rightshift) {
				val |= (*(src + (i*linesize)) & bitmask)
						<< (i - rightshift);
			} else {
				val |= (*(src + (i*linesize)) & bitmask)
						 >> (rightshift - i);
			}
		}
		ks108_writeb_data(par, chipindex, val);
		left++;
		count++;
		if (bitmask == 0x80) {
			bitmask = 1;
			src++;
			rightshift=0;
		} else {
			bitmask <<= 1;
			rightshift++;
		}
	}
}

/*
 * here we handle the entire vertical page of the update. we write across
 * lcd chips. update_page uses the upper/left values to decide which
 * chip to select for the right. upper is needed for setting the page
 * desired for the write.
 */
static void arcfb_lcd_update_vert(struct arcfb_par *par, unsigned int top,
		unsigned int bottom, unsigned int left, unsigned int right)
{
	unsigned int distance, upper, lower;

	distance = (bottom - top) + 1;
	upper = top;
	lower = top + 7;

	while (distance > 0) {
		distance -= 8;
		arcfb_lcd_update_page(par, upper, left, right, 8);
		upper = lower + 1;
		lower = upper + 7;
	}
}

/*
 * here we handle horizontal blocks for the update. update_vert will
 * handle spaning multiple pages. we break out each horizontal
 * block in to individual blocks no taller than 64 pixels.
 */
static void arcfb_lcd_update_horiz(struct arcfb_par *par, unsigned int left,
			unsigned int right, unsigned int top, unsigned int h)
{
	unsigned int distance, upper, lower;

	distance = h;
	upper = floor8(top);
	lower = min(upper + distance - 1, ceil64(upper));

	while (distance > 0) {
		distance -= ((lower - upper) + 1 );
		arcfb_lcd_update_vert(par, upper, lower, left, right);
		upper = lower + 1;
		lower = min(upper + distance - 1, ceil64(upper));
	}
}

/*
 * here we start the process of spliting out the fb update into
 * individual blocks of pixels. we end up spliting into 64x64 blocks
 * and finally down to 64x8 pages.
 */
static void arcfb_lcd_update(struct arcfb_par *par, unsigned int dx,
			unsigned int dy, unsigned int w, unsigned int h)
{
	unsigned int left, right, distance, y;

	/* align the request first */
	y = floor8(dy);
	h += dy - y;
	h = iceil8(h);

	distance = w;
	left = dx;
	right = min(left + w - 1, ceil64(left));

	while (distance > 0) {
		arcfb_lcd_update_horiz(par, left, right, y, h);
		distance -= ((right - left) + 1);
		left = right + 1;
		right = min(left + distance - 1, ceil64(left));
	}
}

void arcfb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
	struct arcfb_par *par = info->par;

	cfb_fillrect(info, rect);

	/* update the physical lcd */
	arcfb_lcd_update(par, rect->dx, rect->dy, rect->width, rect->height);
}

void arcfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
{
	struct arcfb_par *par = info->par;

	cfb_copyarea(info, area);

	/* update the physical lcd */
	arcfb_lcd_update(par, area->dx, area->dy, area->width, area->height);
}

void arcfb_imageblit(struct fb_info *info, const struct fb_image *image)
{
	struct arcfb_par *par = info->par;

	cfb_imageblit(info, image);

	/* update the physical lcd */
	arcfb_lcd_update(par, image->dx, image->dy, image->width,
				image->height);
}

static int arcfb_ioctl(struct inode *inode, struct file *file,
			  unsigned int cmd, unsigned long arg,
			  struct fb_info *info)
{
	void __user *argp = (void __user *)arg;
	struct arcfb_par *par = info->par;
	unsigned long flags;

	switch (cmd) {
		case FBIO_WAITEVENT:
		{
			DEFINE_WAIT(wait);
			/* illegal to wait on arc if no irq will occur */
			if (!par->irq)
				return -EINVAL;

			/* wait until the Arc has generated an interrupt
			 * which will wake us up */
			spin_lock_irqsave(&par->lock, flags);
			prepare_to_wait(&arcfb_waitq, &wait,
					TASK_INTERRUPTIBLE);
			spin_unlock_irqrestore(&par->lock, flags);
			schedule();
			finish_wait(&arcfb_waitq, &wait);
		}
		case FBIO_GETCONTROL2:
		{
			unsigned char ctl2;

			ctl2 = ks108_readb_ctl2(info->par);
			if (copy_to_user(argp, &ctl2, sizeof(ctl2)))
				return -EFAULT;
			return 0;
		}
		default:
			return -EINVAL;
	}
}

/*
 * this is the access path from userspace. they can seek and write to
 * the fb. it's inefficient for them to do anything less than 64*8
 * writes since we update the lcd in each write() anyway.
 */
static ssize_t arcfb_write(struct file *file, const char *buf, size_t count,
				loff_t *ppos)
{
	/* modded from epson 1355 */

	struct inode *inode;
	int fbidx;
	struct fb_info *info;
	unsigned long p;
	int err=-EINVAL;
	unsigned int fbmemlength,x,y,w,h, bitppos, startpos, endpos, bitcount;
	struct arcfb_par *par;
	unsigned int xres;

	p = *ppos;
	inode = file->f_dentry->d_inode;
	fbidx = iminor(inode);
	info = registered_fb[fbidx];
	par = info->par;

	if (!info || !info->screen_base)
		return -ENODEV;

	xres = info->var.xres;
	fbmemlength = (xres * info->var.yres)/8;

	if (p > fbmemlength)
		return -ENOSPC;

	err = 0;
	if ((count + p) > fbmemlength) {
		count = fbmemlength - p;
		err = -ENOSPC;
	}

	if (count) {
		char *base_addr;

		base_addr = info->screen_base;
		count -= copy_from_user(base_addr + p, buf, count);
		*ppos += count;
		err = -EFAULT;
	}


	bitppos = p*8;
	startpos = floorXres(bitppos, xres);
	endpos = ceilXres((bitppos + (count*8)), xres);
	bitcount = endpos - startpos;

	x = startpos % xres;
	y = startpos / xres;
	w = xres;
	h = bitcount / xres;
	arcfb_lcd_update(par, x, y, w, h);

	if (count)
		return count;
	return err;
}

static void arcfb_platform_release(struct device *device)
{
}

static struct fb_ops arcfb_ops = {
	.owner		= THIS_MODULE,
	.fb_open	= arcfb_open,
	.fb_write	= arcfb_write,
	.fb_release	= arcfb_release,
	.fb_pan_display	= arcfb_pan_display,
	.fb_fillrect	= arcfb_fillrect,
	.fb_copyarea	= arcfb_copyarea,
	.fb_imageblit	= arcfb_imageblit,
	.fb_cursor	= soft_cursor,
	.fb_ioctl 	= arcfb_ioctl,
};

static int __init arcfb_probe(struct device *device)
{
	struct platform_device *dev = to_platform_device(device);
	struct fb_info *info;
	int retval = -ENOMEM;
	int videomemorysize;
	unsigned char *videomemory;
	struct arcfb_par *par;
	int i;

	videomemorysize = (((64*64)*num_cols)*num_rows)/8;

	/* We need a flat backing store for the Arc's
	   less-flat actual paged framebuffer */
	if (!(videomemory = vmalloc(videomemorysize)))
		return retval;

	memset(videomemory, 0, videomemorysize);

	info = framebuffer_alloc(sizeof(struct arcfb_par), &dev->dev);
	if (!info)
		goto err;

	info->screen_base = (char __iomem *)videomemory;
	info->fbops = &arcfb_ops;

	info->var = arcfb_var;
	info->fix = arcfb_fix;
	par = info->par;
	par->info = info;

	if (!dio_addr || !cio_addr || !c2io_addr) {
		printk(KERN_WARNING "no IO addresses supplied\n");
		goto err1;
	}
	par->dio_addr = dio_addr;
	par->cio_addr = cio_addr;
	par->c2io_addr = c2io_addr;
	par->cslut[0] = 0x00;
	par->cslut[1] = 0x06;
	info->flags = FBINFO_FLAG_DEFAULT;
	spin_lock_init(&par->lock);
	retval = register_framebuffer(info);
	if (retval < 0)
		goto err1;
	dev_set_drvdata(&dev->dev, info);
	if (irq) {
		par->irq = irq;
		if (request_irq(par->irq, &arcfb_interrupt, SA_SHIRQ,
				"arcfb", info)) {
			printk(KERN_INFO
				"arcfb: Failed req IRQ %d\n", par->irq);
			goto err1;
		}
	}
	printk(KERN_INFO
	       "fb%d: Arc frame buffer device, using %dK of video memory\n",
	       info->node, videomemorysize >> 10);

	/* this inits the lcd but doesn't clear dirty pixels */
	for (i = 0; i < num_cols * num_rows; i++) {
		ks108_writeb_ctl(par, i, KS_DPY_OFF);
		ks108_set_start_line(par, i, 0);
		ks108_set_yaddr(par, i, 0);
		ks108_set_xaddr(par, i, 0);
		ks108_writeb_ctl(par, i, KS_DPY_ON);
	}

	/* if we were told to splash the screen, we just clear it */
	if (!nosplash) {
		for (i = 0; i < num_cols * num_rows; i++) {
			printk(KERN_INFO "fb%d: splashing lcd %d\n",
				info->node, i);
			ks108_set_start_line(par, i, 0);
			ks108_clear_lcd(par, i);
		}
	}

	return 0;
err1:
	framebuffer_release(info);
err:
	vfree(videomemory);
	return retval;
}

static int arcfb_remove(struct device *device)
{
	struct fb_info *info = dev_get_drvdata(device);

	if (info) {
		unregister_framebuffer(info);
		vfree(info->screen_base);
		framebuffer_release(info);
	}
	return 0;
}

static struct device_driver arcfb_driver = {
	.name	= "arcfb",
	.bus	= &platform_bus_type,
	.probe	= arcfb_probe,
	.remove = arcfb_remove,
};

static struct platform_device arcfb_device = {
	.name	= "arcfb",
	.id	= 0,
	.dev	= {
		.release = arcfb_platform_release,
	}
};

static int __init arcfb_init(void)
{
	int ret;

	if (!arcfb_enable)
		return -ENXIO;

	ret = driver_register(&arcfb_driver);
	if (!ret) {
		ret = platform_device_register(&arcfb_device);
		if (ret)
			driver_unregister(&arcfb_driver);
	}
	return ret;

}

static void __exit arcfb_exit(void)
{
	platform_device_unregister(&arcfb_device);
	driver_unregister(&arcfb_driver);
}

module_param(num_cols, ulong, 0);
MODULE_PARM_DESC(num_cols, "Num horiz panels, eg: 2 = 128 bit wide");
module_param(num_rows, ulong, 0);
MODULE_PARM_DESC(num_rows, "Num vert panels, eg: 1 = 64 bit high");
module_param(nosplash, uint, 0);
MODULE_PARM_DESC(nosplash, "Disable doing the splash screen");
module_param(arcfb_enable, uint, 0);
MODULE_PARM_DESC(arcfb_enable, "Enable communication with Arc board");
module_param(dio_addr, ulong, 0);
MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480");
module_param(cio_addr, ulong, 0);
MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400");
module_param(c2io_addr, ulong, 0);
MODULE_PARM_DESC(c2io_addr, "IO address for secondary control, eg: 0x408");
module_param(splashval, ulong, 0);
MODULE_PARM_DESC(splashval, "Splash pattern: 0xFF is black, 0x00 is green");
module_param(tuhold, ulong, 0);
MODULE_PARM_DESC(tuhold, "Time to hold between strobing data to Arc board");
module_param(irq, uint, 0);
MODULE_PARM_DESC(irq, "IRQ for the Arc board");

module_init(arcfb_init);
module_exit(arcfb_exit);

MODULE_DESCRIPTION("fbdev driver for Arc monochrome LCD board");
MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL");
Commit	Line	Data
1154ea7d JK	1	/*
	2	* linux/drivers/video/arcfb.c -- FB driver for Arc monochrome LCD board
	3	*
	4	* Copyright (C) 2005, Jaya Kumar <jayalk@intworks.biz>
	5	* http://www.intworks.biz/arclcd
	6	*
	7	* This file is subject to the terms and conditions of the GNU General Public
	8	* License. See the file COPYING in the main directory of this archive for
	9	* more details.
	10	*
	11	* Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
	12	*
	13	* This driver was written to be used with the Arc LCD board. Arc uses a
	14	* set of KS108 chips that control individual 64x64 LCD matrices. The board
	15	* can be paneled in a variety of setups such as 2x1=128x64, 4x4=256x256 and
	16	* so on. The interface between the board and the host is TTL based GPIO. The
	17	* GPIO requirements are 8 writable data lines and 4+n lines for control. On a
	18	* GPIO-less system, the board can be tested by connecting the respective sigs
	19	* up to a parallel port connector. The driver requires the IO addresses for
	20	* data and control GPIO at load time. It is unable to probe for the
	21	* existence of the LCD so it must be told at load time whether it should
	22	* be enabled or not.
	23	*
	24	* Todo:
	25	* - testing with 4x4
	26	* - testing with interrupt hw
	27	*
	28	* General notes:
	29	* - User must set tuhold. It's in microseconds. According to the 108 spec,
	30	* the hold time is supposed to be at least 1 microsecond.
	31	* - User must set num_cols=x num_rows=y, eg: x=2 means 128
	32	* - User must set arcfb_enable=1 to enable it
	33	* - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR
	34	*
	35	*/
	36
	37	#include <linux/module.h>
	38	#include <linux/kernel.h>
	39	#include <linux/errno.h>
	40	#include <linux/string.h>
	41	#include <linux/mm.h>
	42	#include <linux/tty.h>
	43	#include <linux/slab.h>
	44	#include <linux/vmalloc.h>
	45	#include <linux/delay.h>
	46	#include <linux/interrupt.h>
	47	#include <linux/fb.h>
	48	#include <linux/init.h>
	49	#include <linux/arcfb.h>
	50
	51	#include <asm/uaccess.h>
	52
	53	#define floor8(a) (a&(~0x07))
	54	#define floorXres(a,xres) (a&(~(xres - 1)))
	55	#define iceil8(a) (((int)((a+7)/8))*8)
	56	#define ceil64(a) (a\|0x3F)
	57	#define ceilXres(a,xres) (a\|(xres - 1))
	58
	59	/* ks108 chipset specific defines and code */
	60
	61	#define KS_SET_DPY_START_LINE 0xC0
	62	#define KS_SET_PAGE_NUM 0xB8
	63	#define KS_SET_X 0x40
	64	#define KS_CEHI 0x01
65	#define KS_CELO 0x00
66	#define KS_SEL_CMD 0x08
67	#define KS_SEL_DATA 0x00
68	#define KS_DPY_ON 0x3F
69	#define KS_DPY_OFF 0x3E
70	#define KS_INTACK 0x40
71	#define KS_CLRINT 0x02
72
73	struct arcfb_par {
74	unsigned long dio_addr;
75	unsigned long cio_addr;
76	unsigned long c2io_addr;
77	atomic_t ref_count;
78	unsigned char cslut[9];
79	struct fb_info *info;
80	unsigned int irq;
81	spinlock_t lock;
82	};
83
84	static struct fb_fix_screeninfo arcfb_fix __initdata = {
85	.id = "arcfb",
86	.type = FB_TYPE_PACKED_PIXELS,
87	.visual = FB_VISUAL_MONO01,
88	.xpanstep = 0,
89	.ypanstep = 1,
90	.ywrapstep = 0,
91	.accel = FB_ACCEL_NONE,
92	};
93
94	static struct fb_var_screeninfo arcfb_var __initdata = {
95	.xres = 128,
96	.yres = 64,
97	.xres_virtual = 128,
98	.yres_virtual = 64,
99	.bits_per_pixel = 1,
100	.nonstd = 1,
101	};
102
103	static unsigned long num_cols;
104	static unsigned long num_rows;
105	static unsigned long dio_addr;
106	static unsigned long cio_addr;
107	static unsigned long c2io_addr;
108	static unsigned long splashval;
109	static unsigned long tuhold;
110	static unsigned int nosplash;
111	static unsigned int arcfb_enable;
112	static unsigned int irq;
113
114	static DECLARE_WAIT_QUEUE_HEAD(arcfb_waitq);
115
116	static void ks108_writeb_ctl(struct arcfb_par *par,
117	unsigned int chipindex, unsigned char value)
118	{
119	unsigned char chipselval = par->cslut[chipindex];
120
121	outb(chipselval\|KS_CEHI\|KS_SEL_CMD, par->cio_addr);
122	outb(value, par->dio_addr);
123	udelay(tuhold);
124	outb(chipselval\|KS_CELO\|KS_SEL_CMD, par->cio_addr);
125	}
126
127	static void ks108_writeb_mainctl(struct arcfb_par *par, unsigned char value)
128	{
129
130	outb(value, par->cio_addr);
131	udelay(tuhold);
132	}
133
134	static unsigned char ks108_readb_ctl2(struct arcfb_par *par)
135	{
136	return inb(par->c2io_addr);
137	}
138
139	static void ks108_writeb_data(struct arcfb_par *par,
140	unsigned int chipindex, unsigned char value)
141	{
142	unsigned char chipselval = par->cslut[chipindex];
143
144	outb(chipselval\|KS_CEHI\|KS_SEL_DATA, par->cio_addr);
145	outb(value, par->dio_addr);
146	udelay(tuhold);
147	outb(chipselval\|KS_CELO\|KS_SEL_DATA, par->cio_addr);
148	}
149
150	static void ks108_set_start_line(struct arcfb_par *par,
151	unsigned int chipindex, unsigned char y)
152	{
153	ks108_writeb_ctl(par, chipindex, KS_SET_DPY_START_LINE\|y);
154	}
155
156	static void ks108_set_yaddr(struct arcfb_par *par,
157	unsigned int chipindex, unsigned char y)
158	{
159	ks108_writeb_ctl(par, chipindex, KS_SET_PAGE_NUM\|y);
160	}
161
162	static void ks108_set_xaddr(struct arcfb_par *par,
163	unsigned int chipindex, unsigned char x)
164	{
165	ks108_writeb_ctl(par, chipindex, KS_SET_X\|x);
166	}
167
168	static void ks108_clear_lcd(struct arcfb_par *par, unsigned int chipindex)
169	{
170	int i,j;
171
172	for (i = 0; i <= 8; i++) {
173	ks108_set_yaddr(par, chipindex, i);
174	ks108_set_xaddr(par, chipindex, 0);
175	for (j = 0; j < 64; j++) {
176	ks108_writeb_data(par, chipindex,
177	(unsigned char) splashval);
178	}
179	}
180	}
181
182	/* main arcfb functions */
183
184	static int arcfb_open(struct fb_info *info, int user)
185	{
186	struct arcfb_par *par = info->par;
187
188	atomic_inc(&par->ref_count);
189	return 0;
190	}
191
192	static int arcfb_release(struct fb_info *info, int user)
193	{
194	struct arcfb_par *par = info->par;
195	int count = atomic_read(&par->ref_count);
196
197	if (!count)
198	return -EINVAL;
199	atomic_dec(&par->ref_count);
200	return 0;
201	}
202
203	static int arcfb_pan_display(struct fb_var_screeninfo *var,
204	struct fb_info *info)
205	{
206	int i;
207	struct arcfb_par *par = info->par;
208
209	if ((var->vmode & FB_VMODE_YWRAP) && (var->yoffset < 64)
210	&& (info->var.yres <= 64)) {
211	for (i = 0; i < num_cols; i++) {
212	ks108_set_start_line(par, i, var->yoffset);
213	}
214	info->var.yoffset = var->yoffset;
215	return 0;
216	}
217
218	return -EINVAL;
219	}
220
221	static irqreturn_t arcfb_interrupt(int vec, void *dev_instance,
222	struct pt_regs *regs)
223	{
224	struct fb_info *info = dev_instance;
225	unsigned char ctl2status;
226	struct arcfb_par *par = info->par;
227
228	ctl2status = ks108_readb_ctl2(par);
229
230	if (!(ctl2status & KS_INTACK)) /* not arc generated interrupt */
231	return IRQ_NONE;
232
233	ks108_writeb_mainctl(par, KS_CLRINT);
234
235	spin_lock(&par->lock);
236	if (waitqueue_active(&arcfb_waitq)) {
237	wake_up(&arcfb_waitq);
238	}
239	spin_unlock(&par->lock);
240
241	return IRQ_HANDLED;
242	}
243
244	/*
245	* here we handle a specific page on the lcd. the complexity comes from
246	* the fact that the fb is laidout in 8xX vertical columns. we extract
247	* each write of 8 vertical pixels. then we shift out as we move along
248	* X. That's what rightshift does. bitmask selects the desired input bit.
249	*/
250	static void arcfb_lcd_update_page(struct arcfb_par *par, unsigned int upper,
251	unsigned int left, unsigned int right, unsigned int distance)
252	{
253	unsigned char *src;
254	unsigned int xindex, yindex, chipindex, linesize;
255	int i, count;
256	unsigned char val;
257	unsigned char bitmask, rightshift;
258
259	xindex = left >> 6;
260	yindex = upper >> 6;
261	chipindex = (xindex + (yindex*num_cols));
262
263	ks108_set_yaddr(par, chipindex, upper/8);
264
265	linesize = par->info->var.xres/8;
266	src = par->info->screen_base + (left/8) + (upper * linesize);
267	ks108_set_xaddr(par, chipindex, left);
268
269	bitmask=1;
270	rightshift=0;
271	while (left <= right) {
272	val = 0;
273	for (i = 0; i < 8; i++) {
274	if ( i > rightshift) {
275	val \|= ((src + (ilinesize)) & bitmask)
276	<< (i - rightshift);
277	} else {
278	val \|= ((src + (ilinesize)) & bitmask)
279	>> (rightshift - i);
280	}
281	}
282	ks108_writeb_data(par, chipindex, val);
283	left++;
284	count++;
285	if (bitmask == 0x80) {
286	bitmask = 1;
287	src++;
288	rightshift=0;
289	} else {
290	bitmask <<= 1;
291	rightshift++;
292	}
293	}
294	}
295
296	/*
297	* here we handle the entire vertical page of the update. we write across
298	* lcd chips. update_page uses the upper/left values to decide which
299	* chip to select for the right. upper is needed for setting the page
300	* desired for the write.
301	*/
302	static void arcfb_lcd_update_vert(struct arcfb_par *par, unsigned int top,
303	unsigned int bottom, unsigned int left, unsigned int right)
304	{
305	unsigned int distance, upper, lower;
306
307	distance = (bottom - top) + 1;
308	upper = top;
309	lower = top + 7;
310
311	while (distance > 0) {
312	distance -= 8;
313	arcfb_lcd_update_page(par, upper, left, right, 8);
314	upper = lower + 1;
315	lower = upper + 7;
316	}
317	}
318
319	/*
320	* here we handle horizontal blocks for the update. update_vert will
321	* handle spaning multiple pages. we break out each horizontal
322	* block in to individual blocks no taller than 64 pixels.
323	*/
324	static void arcfb_lcd_update_horiz(struct arcfb_par *par, unsigned int left,
325	unsigned int right, unsigned int top, unsigned int h)
326	{
327	unsigned int distance, upper, lower;
328
329	distance = h;
330	upper = floor8(top);
331	lower = min(upper + distance - 1, ceil64(upper));
332
333	while (distance > 0) {
334	distance -= ((lower - upper) + 1 );
335	arcfb_lcd_update_vert(par, upper, lower, left, right);
336	upper = lower + 1;
337	lower = min(upper + distance - 1, ceil64(upper));
338	}
339	}
340
341	/*
342	* here we start the process of spliting out the fb update into
343	* individual blocks of pixels. we end up spliting into 64x64 blocks
344	* and finally down to 64x8 pages.
345	*/
346	static void arcfb_lcd_update(struct arcfb_par *par, unsigned int dx,
347	unsigned int dy, unsigned int w, unsigned int h)
348	{
349	unsigned int left, right, distance, y;
350
351	/* align the request first */
352	y = floor8(dy);
353	h += dy - y;
354	h = iceil8(h);
355
356	distance = w;
357	left = dx;
358	right = min(left + w - 1, ceil64(left));
359
360	while (distance > 0) {
361	arcfb_lcd_update_horiz(par, left, right, y, h);
362	distance -= ((right - left) + 1);
363	left = right + 1;
364	right = min(left + distance - 1, ceil64(left));
365	}
366	}
367
368	void arcfb_fillrect(struct fb_info info, const struct fb_fillrect rect)
369	{
370	struct arcfb_par *par = info->par;
371
372	cfb_fillrect(info, rect);
373
374	/* update the physical lcd */
375	arcfb_lcd_update(par, rect->dx, rect->dy, rect->width, rect->height);
376	}
377
378	void arcfb_copyarea(struct fb_info info, const struct fb_copyarea area)
379	{
380	struct arcfb_par *par = info->par;
381
382	cfb_copyarea(info, area);
383
384	/* update the physical lcd */
385	arcfb_lcd_update(par, area->dx, area->dy, area->width, area->height);
386	}
387
388	void arcfb_imageblit(struct fb_info info, const struct fb_image image)
389	{
390	struct arcfb_par *par = info->par;
391
392	cfb_imageblit(info, image);
393
394	/* update the physical lcd */
395	arcfb_lcd_update(par, image->dx, image->dy, image->width,
396	image->height);
397	}
398
399	static int arcfb_ioctl(struct inode inode, struct file file,
400	unsigned int cmd, unsigned long arg,
401	struct fb_info *info)
402	{
403	void __user argp = (void __user )arg;
404	struct arcfb_par *par = info->par;
405	unsigned long flags;
406
407	switch (cmd) {
408	case FBIO_WAITEVENT:
409	{
410	DEFINE_WAIT(wait);
411	/* illegal to wait on arc if no irq will occur */
412	if (!par->irq)
413	return -EINVAL;
414
415	/* wait until the Arc has generated an interrupt
416	* which will wake us up */
417	spin_lock_irqsave(&par->lock, flags);
418	prepare_to_wait(&arcfb_waitq, &wait,
419	TASK_INTERRUPTIBLE);
420	spin_unlock_irqrestore(&par->lock, flags);
421	schedule();
422	finish_wait(&arcfb_waitq, &wait);
423	}
424	case FBIO_GETCONTROL2:
425	{
426	unsigned char ctl2;
427
428	ctl2 = ks108_readb_ctl2(info->par);
429	if (copy_to_user(argp, &ctl2, sizeof(ctl2)))
430	return -EFAULT;
431	return 0;
432	}
433	default:
434	return -EINVAL;
435	}
436	}
437
438	/*
439	* this is the access path from userspace. they can seek and write to
440	* the fb. it's inefficient for them to do anything less than 64*8
441	* writes since we update the lcd in each write() anyway.
442	*/
443	static ssize_t arcfb_write(struct file file, const char buf, size_t count,
444	loff_t *ppos)
445	{
446	/* modded from epson 1355 */
447
448	struct inode *inode;
449	int fbidx;
450	struct fb_info *info;
451	unsigned long p;
452	int err=-EINVAL;
453	unsigned int fbmemlength,x,y,w,h, bitppos, startpos, endpos, bitcount;
454	struct arcfb_par *par;
455	unsigned int xres;
456
457	p = *ppos;
458	inode = file->f_dentry->d_inode;
459	fbidx = iminor(inode);
460	info = registered_fb[fbidx];
461	par = info->par;
462
463	if (!info \|\| !info->screen_base)
464	return -ENODEV;
465
466	xres = info->var.xres;
467	fbmemlength = (xres * info->var.yres)/8;
468
469	if (p > fbmemlength)
470	return -ENOSPC;
471
472	err = 0;
473	if ((count + p) > fbmemlength) {
474	count = fbmemlength - p;
475	err = -ENOSPC;
476	}
477
478	if (count) {
479	char *base_addr;
480
481	base_addr = info->screen_base;
482	count -= copy_from_user(base_addr + p, buf, count);
483	*ppos += count;
484	err = -EFAULT;
485	}
486
487
488	bitppos = p*8;
489	startpos = floorXres(bitppos, xres);
490	endpos = ceilXres((bitppos + (count*8)), xres);
491	bitcount = endpos - startpos;
492
493	x = startpos % xres;
494	y = startpos / xres;
495	w = xres;
496	h = bitcount / xres;
497	arcfb_lcd_update(par, x, y, w, h);
498
499	if (count)
500	return count;
501	return err;
502	}
503
504	static void arcfb_platform_release(struct device *device)
505	{
506	}
507
508	static struct fb_ops arcfb_ops = {
509	.owner = THIS_MODULE,
510	.fb_open = arcfb_open,
511	.fb_write = arcfb_write,
512	.fb_release = arcfb_release,
513	.fb_pan_display = arcfb_pan_display,
514	.fb_fillrect = arcfb_fillrect,
515	.fb_copyarea = arcfb_copyarea,
516	.fb_imageblit = arcfb_imageblit,
517	.fb_cursor = soft_cursor,
518	.fb_ioctl = arcfb_ioctl,
519	};
520
521	static int __init arcfb_probe(struct device *device)
522	{
523	struct platform_device *dev = to_platform_device(device);
524	struct fb_info *info;
525	int retval = -ENOMEM;
526	int videomemorysize;
527	unsigned char *videomemory;
528	struct arcfb_par *par;
529	int i;
530
531	videomemorysize = (((6464)num_cols)*num_rows)/8;
532
533	/* We need a flat backing store for the Arc's
534	less-flat actual paged framebuffer */
535	if (!(videomemory = vmalloc(videomemorysize)))
536	return retval;
537
538	memset(videomemory, 0, videomemorysize);
539
540	info = framebuffer_alloc(sizeof(struct arcfb_par), &dev->dev);
541	if (!info)
542	goto err;
543
544	info->screen_base = (char __iomem *)videomemory;
545	info->fbops = &arcfb_ops;
546
547	info->var = arcfb_var;
548	info->fix = arcfb_fix;
549	par = info->par;
550	par->info = info;
551
552	if (!dio_addr \|\| !cio_addr \|\| !c2io_addr) {
553	printk(KERN_WARNING "no IO addresses supplied\n");
554	goto err1;
555	}
556	par->dio_addr = dio_addr;
557	par->cio_addr = cio_addr;
558	par->c2io_addr = c2io_addr;
559	par->cslut[0] = 0x00;
560	par->cslut[1] = 0x06;
561	info->flags = FBINFO_FLAG_DEFAULT;
562	spin_lock_init(&par->lock);
563	retval = register_framebuffer(info);
564	if (retval < 0)
565	goto err1;
566	dev_set_drvdata(&dev->dev, info);
567	if (irq) {
568	par->irq = irq;
569	if (request_irq(par->irq, &arcfb_interrupt, SA_SHIRQ,
570	"arcfb", info)) {
571	printk(KERN_INFO
572	"arcfb: Failed req IRQ %d\n", par->irq);
573	goto err1;
574	}
575	}
576	printk(KERN_INFO
577	"fb%d: Arc frame buffer device, using %dK of video memory\n",
578	info->node, videomemorysize >> 10);
579
580	/* this inits the lcd but doesn't clear dirty pixels */
581	for (i = 0; i < num_cols * num_rows; i++) {
582	ks108_writeb_ctl(par, i, KS_DPY_OFF);
583	ks108_set_start_line(par, i, 0);
584	ks108_set_yaddr(par, i, 0);
585	ks108_set_xaddr(par, i, 0);
586	ks108_writeb_ctl(par, i, KS_DPY_ON);
587	}
588
589	/* if we were told to splash the screen, we just clear it */
590	if (!nosplash) {
591	for (i = 0; i < num_cols * num_rows; i++) {
592	printk(KERN_INFO "fb%d: splashing lcd %d\n",
593	info->node, i);
594	ks108_set_start_line(par, i, 0);
595	ks108_clear_lcd(par, i);
596	}
597	}
598
599	return 0;
600	err1:
601	framebuffer_release(info);
602	err:
603	vfree(videomemory);
604	return retval;
605	}
606
607	static int arcfb_remove(struct device *device)
608	{
609	struct fb_info *info = dev_get_drvdata(device);
610
611	if (info) {
612	unregister_framebuffer(info);
613	vfree(info->screen_base);
614	framebuffer_release(info);
615	}
616	return 0;
617	}
618
619	static struct device_driver arcfb_driver = {
620	.name = "arcfb",
621	.bus = &platform_bus_type,
622	.probe = arcfb_probe,
623	.remove = arcfb_remove,
624	};
625
626	static struct platform_device arcfb_device = {
627	.name = "arcfb",
628	.id = 0,
629	.dev = {
630	.release = arcfb_platform_release,
631	}
632	};
633
634	static int __init arcfb_init(void)
635	{
636	int ret;
637
638	if (!arcfb_enable)
639	return -ENXIO;
640
641	ret = driver_register(&arcfb_driver);
642	if (!ret) {
643	ret = platform_device_register(&arcfb_device);
644	if (ret)
645	driver_unregister(&arcfb_driver);
646	}
647	return ret;
648
649	}
650
651	static void __exit arcfb_exit(void)
652	{
653	platform_device_unregister(&arcfb_device);
654	driver_unregister(&arcfb_driver);
655	}
656
657	module_param(num_cols, ulong, 0);
658	MODULE_PARM_DESC(num_cols, "Num horiz panels, eg: 2 = 128 bit wide");
659	module_param(num_rows, ulong, 0);
660	MODULE_PARM_DESC(num_rows, "Num vert panels, eg: 1 = 64 bit high");
661	module_param(nosplash, uint, 0);
662	MODULE_PARM_DESC(nosplash, "Disable doing the splash screen");
663	module_param(arcfb_enable, uint, 0);
664	MODULE_PARM_DESC(arcfb_enable, "Enable communication with Arc board");
665	module_param(dio_addr, ulong, 0);
666	MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480");
667	module_param(cio_addr, ulong, 0);
668	MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400");
669	module_param(c2io_addr, ulong, 0);
670	MODULE_PARM_DESC(c2io_addr, "IO address for secondary control, eg: 0x408");
671	module_param(splashval, ulong, 0);
672	MODULE_PARM_DESC(splashval, "Splash pattern: 0xFF is black, 0x00 is green");
673	module_param(tuhold, ulong, 0);
674	MODULE_PARM_DESC(tuhold, "Time to hold between strobing data to Arc board");
675	module_param(irq, uint, 0);
676	MODULE_PARM_DESC(irq, "IRQ for the Arc board");
677
678	module_init(arcfb_init);
679	module_exit(arcfb_exit);
680
681	MODULE_DESCRIPTION("fbdev driver for Arc monochrome LCD board");
682	MODULE_AUTHOR("Jaya Kumar");
683	MODULE_LICENSE("GPL");
684