path: root/drivers/video/s1d13xxxfb.c

/* drivers/video/s1d13xxxfb.c
 *
 * (c) 2004 Simtec Electronics
 * (c) 2005 Thibaut VARENE <varenet@parisc-linux.org>
 * (c) 2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
 *
 * Driver for Epson S1D13xxx series framebuffer chips
 *
 * Adapted from
 *  linux/drivers/video/skeletonfb.c
 *  linux/drivers/video/epson1355fb.c
 *  linux/drivers/video/epson/s1d13xxxfb.c (2.4 driver by Epson)
 *
 * TODO: - handle dual screen display (CRT and LCD at the same time).
 *	 - check_var(), mode change, etc.
 *	 - probably not SMP safe :)
 *       - support all bitblt operations on all cards
 *
 * 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/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/fb.h>
#include <linux/spinlock_types.h>
#include <linux/spinlock.h>

#include <asm/io.h>

#include <video/s1d13xxxfb.h>

#define PFX	"s1d13xxxfb: "
#define BLIT	"s1d13xxxfb_bitblt: "

/*
 * set this to enable debugging on general functions
 */
#if 0
#define dbg(fmt, args...) do { printk(KERN_INFO fmt, ## args); } while(0)
#else
#define dbg(fmt, args...) do { } while (0)
#endif

/*
 * set this to enable debugging on 2D acceleration
 */
#if 0
#define dbg_blit(fmt, args...) do { printk(KERN_INFO BLIT fmt, ## args); } while (0)
#else
#define dbg_blit(fmt, args...) do { } while (0)
#endif

/*
 * we make sure only one bitblt operation is running
 */
static DEFINE_SPINLOCK(s1d13xxxfb_bitblt_lock);

/*
 * list of card production ids
 */
static const int s1d13xxxfb_prod_ids[] = {
	S1D13505_PROD_ID,
	S1D13506_PROD_ID,
	S1D13806_PROD_ID,
};

/*
 * List of card strings
 */
static const char *s1d13xxxfb_prod_names[] = {
	"S1D13505",
	"S1D13506",
	"S1D13806",
};

/*
 * here we define the default struct fb_fix_screeninfo
 */
static struct fb_fix_screeninfo __devinitdata s1d13xxxfb_fix = {
	.id		= S1D_FBID,
	.type		= FB_TYPE_PACKED_PIXELS,
	.visual		= FB_VISUAL_PSEUDOCOLOR,
	.xpanstep	= 0,
	.ypanstep	= 1,
	.ywrapstep	= 0,
	.accel		= FB_ACCEL_NONE,
};

static inline u8
s1d13xxxfb_readreg(struct s1d13xxxfb_par *par, u16 regno)
{
#if defined(CONFIG_PLAT_M32700UT) || defined(CONFIG_PLAT_OPSPUT) || defined(CONFIG_PLAT_MAPPI3)
	regno=((regno & 1) ? (regno & ~1L) : (regno + 1));
#endif
	return readb(par->regs + regno);
}

static inline void
s1d13xxxfb_writereg(struct s1d13xxxfb_par *par, u16 regno, u8 value)
{
#if defined(CONFIG_PLAT_M32700UT) || defined(CONFIG_PLAT_OPSPUT) || defined(CONFIG_PLAT_MAPPI3)
	regno=((regno & 1) ? (regno & ~1L) : (regno + 1));
#endif
	writeb(value, par->regs + regno);
}

static inline void
s1d13xxxfb_runinit(struct s1d13xxxfb_par *par,
			const struct s1d13xxxfb_regval *initregs,
			const unsigned int size)
{
	int i;

	for (i = 0; i < size; i++) {
        	if ((initregs[i].addr == S1DREG_DELAYOFF) ||
				(initregs[i].addr == S1DREG_DELAYON))
			mdelay((int)initregs[i].value);
        	else {
			s1d13xxxfb_writereg(par, initregs[i].addr, initregs[i].value);
		}
        }

	/* make sure the hardware can cope with us */
	mdelay(1);
}

static inline void
lcd_enable(struct s1d13xxxfb_par *par, int enable)
{
	u8 mode = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);

	if (enable)
		mode |= 0x01;
	else
		mode &= ~0x01;

	s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, mode);
}

static inline void
crt_enable(struct s1d13xxxfb_par *par, int enable)
{
	u8 mode = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);

	if (enable)
		mode |= 0x02;
	else
		mode &= ~0x02;

	s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, mode);
}


/*************************************************************
 framebuffer control functions
 *************************************************************/
static inline void
s1d13xxxfb_setup_pseudocolour(struct fb_info *info)
{
	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

	info->var.red.length = 4;
	info->var.green<