s1d13xxxfb.c

Linux环境下视频显示卡设备的驱动程序源代码

/* drivers/video/s1d13xxxfb.c
 *
 * (c) 2004 Simtec Electronics
 * (c) 2005 Thibaut VARENE <[e-mail]>
 *
 * 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)
 *
 * Note, currently only tested on S1D13806 with 16bit CRT.
 * As such, this driver might still contain some hardcoded bits relating to
 * S1D13806.
 * Making it work on other S1D13XXX chips should merely be a matter of adding
 * a few switch()s, some missing glue here and there maybe, and split header
 * files.
 *
 * TODO: - handle dual screen display (CRT and LCD at the same time).
 *	 - check_var(), mode change, etc.
 *	 - PM untested.
 *	 - Accelerated interfaces.
 *	 - Probably not SMP safe :)
 *
 * 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 <asm/io.h>

#include <video/s1d13xxxfb.h>

#define PFX "s1d13xxxfb: "

#if 0
#define dbg(fmt, args...) do { printk(KERN_INFO fmt, ## args); } while(0)
#else
#define dbg(fmt, args...) do { } while (0)
#endif

static const int __devinitconst s1d13xxxfb_revisions[] = {
	S1D13506_CHIP_REV,	/* Rev.4 on HP Jornada 7xx S1D13506 */
	S1D13806_CHIP_REV,	/* Rev.7 on .. */
};

/*
 * 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 routines */

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

	info->var.red.length = 4;
	info->var.green.length = 4;
	info->var.blue.length = 4;
}

static inline void
s1d13xxxfb_setup_truecolour(struct fb_info *info)
{
	info->fix.visual = FB_VISUAL_TRUECOLOR;
	info->var.bits_per_pixel = 16;

	info->var.red.length = 5;
	info->var.red.offset = 11;

	info->var.green.length = 6;
	info->var.green.offset = 5;

	info->var.blue.length = 5;
	info->var.blue.offset = 0;
}

/**
 *      s1d13xxxfb_set_par - Alters the hardware state.
 *      @info: frame buffer structure
 *
 *	Using the fb_var_screeninfo in fb_info we set the depth of the
 *	framebuffer. This function alters the par AND the
 *	fb_fix_screeninfo stored in fb_info. It doesn't not alter var in
 *	fb_info since we are using that data. This means we depend on the
 *	data in var inside fb_info to be supported by the hardware.
 *	xxxfb_check_var is always called before xxxfb_set_par to ensure this.
 *
 *	XXX TODO: write proper s1d13xxxfb_check_var(), without which that
 *	function is quite useless.
 */
static int
s1d13xxxfb_set_par(struct fb_info *info)
{
	struct s1d13xxxfb_par *s1dfb = info->par;
	unsigned int val;

	dbg("s1d13xxxfb_set_par: bpp=%d\n", info->var.bits_per_pixel);

	if ((s1dfb->display & 0x01))	/* LCD */
		val = s1d13xxxfb_readreg(s1dfb, S1DREG_LCD_DISP_MODE);   /* read colour control */
	else	/* CRT */
		val = s1d13xxxfb_readreg(s1dfb, S1DREG_CRT_DISP_MODE);   /* read colour control */

	val &= ~0x07;

	switch (info->var.bits_per_pixel) {
		case 4:
			dbg("pseudo colour 4\n");
			s1d13xxxfb_setup_pseudocolour(info);
			val |= 2;
			break;
		case 8:
			dbg("pseudo colour 8\n");
			s1d13xxxfb_setup_pseudocolour(info);
			val |= 3;
			break;
		case 16:
			dbg("true colour\n");
			s1d13xxxfb_setup_truecolour(info);
			val |= 5;
			break;

		default:
			dbg("bpp not supported!\n");
			return -EINVAL;
	}

	dbg("writing %02x to display mode register\n", val);

	if ((s1dfb->display & 0x01))	/* LCD */
		s1d13xxxfb_writereg(s1dfb, S1DREG_LCD_DISP_MODE, val);
	else	/* CRT */
		s1d13xxxfb_writereg(s1dfb, S1DREG_CRT_DISP_MODE, val);

	info->fix.line_length  = info->var.xres * info->var.bits_per_pixel;
	info->fix.line_length /= 8;

	dbg("setting line_length to %d\n", info->fix.line_length);

	dbg("done setup\n");

	return 0;
}

/**
 *  	s1d13xxxfb_setcolreg - sets a color register.
 *      @regno: Which register in the CLUT we are programming
 *      @red: The red value which can be up to 16 bits wide
 *	@green: The green value which can be up to 16 bits wide
 *	@blue:  The blue value which can be up to 16 bits wide.
 *	@transp: If supported the alpha value which can be up to 16 bits wide.
 *      @info: frame buffer info structure
 *
 *	Returns negative errno on error, or zero on success.
 */
static int
s1d13xxxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
			u_int transp, struct fb_info *info)
{
	struct s1d13xxxfb_par *s1dfb = info->par;
	unsigned int pseudo_val;

	if (regno >= S1D_PALETTE_SIZE)
		return -EINVAL;

	dbg("s1d13xxxfb_setcolreg: %d: rgb=%d,%d,%d, tr=%d\n",
		    regno, red, green, blue, transp);

	if (info->var.grayscale)
		red = green = blue = (19595*red + 38470*green + 7471*blue) >> 16;

	switch (info->fix.visual) {
		case FB_VISUAL_TRUECOLOR:
			if (regno >= 16)
				return -EINVAL;

			/* deal with creating pseudo-palette entries */

			pseudo_val  = (red   >> 11) << info->var.red.offset;
			pseudo_val |= (green >> 10) << info->var.green.offset;
			pseudo_val |= (blue  >> 11) << info->var.blue.offset;

			dbg("s1d13xxxfb_setcolreg: pseudo %d, val %08x\n",
				    regno, pseudo_val);

#if defined(CONFIG_PLAT_MAPPI)
			((u32 *)info->pseudo_palette)[regno] = cpu_to_le16(pseudo_val);
#else
			((u32 *)info->pseudo_palette)[regno] = pseudo_val;
#endif

			break;
		case FB_VISUAL_PSEUDOCOLOR:
			s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_ADDR, regno);
			s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, red);
			s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, green);
			s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, blue);

			break;
		default:
			return -ENOSYS;
	}

	dbg("s1d13xxxfb_setcolreg: done\n");

	return 0;
}

/**
 *      s1d13xxxfb_blank - blanks the display.
 *      @blank_mode: the blank mode we want.
 *      @info: frame buffer structure that represents a single frame buffer
 *
 *      Blank the screen if blank_mode != 0, else unblank. 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
 *
 *      Returns negative errno on error, or zero on success.
 */
static int
s1d13xxxfb_blank(int blank_mode, struct fb_info *info)
{
	struct s1d13xxxfb_par *par = info->par;

	dbg("s1d13xxxfb_blank: blank=%d, info=%p\n", blank_mode, info);

	switch (blank_mode) {
		case FB_BLANK_UNBLANK:
		case FB_BLANK_NORMAL:
			if ((par->display & 0x01) != 0)
				lcd_enable(par, 1);
			if ((par->display & 0x02) != 0)
				crt_enable(par, 1);
			break;
		case FB_BLANK_VSYNC_SUSPEND:
		case FB_BLANK_HSYNC_SUSPEND:
			break;
		case FB_BLANK_POWERDOWN:
			lcd_enable(par, 0);
			crt_enable(par, 0);
			break;
		default:
			return -EINVAL;
	}

	/* let fbcon do a soft blank for us */
	return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
}

/**
 *      s1d13xxxfb_pan_display - Pans the display.
 *      @var: frame buffer variable screen structure
 *      @info: frame buffer structure that represents a single frame buffer
 *
 *	Pan (or wrap, depending on the `vmode' field) the display using the
 *  	`yoffset' field of the `var' structure (`xoffset'  not yet supported).
 *  	If the values don't fit, return -EINVAL.
 *
 *      Returns negative errno on error, or zero on success.
 */
static int
s1d13xxxfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
{
	struct s1d13xxxfb_par *par = info->par;
	u32 start;

	if (var->xoffset != 0)	/* not yet ... */
		return -EINVAL;

	if (var->yoffset + info->var.yres > info->var.yres_virtual)
		return -EINVAL;

	start = (info->fix.line_length >> 1) * var->yoffset;

	if ((par->display & 0x01)) {
		/* LCD */
		s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START0, (start & 0xff));
		s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START1, ((start >> 8) & 0xff));
		s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START2, ((start >> 16) & 0x0f));
	} else {
		/* CRT */
		s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START0, (start & 0xff));
		s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START1, ((start >> 8) & 0xff));
		s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START2, ((start >> 16) & 0x0f));
	}

	return 0;
}


/* framebuffer information structures */

static struct fb_ops s1d13xxxfb_fbops = {
	.owner		= THIS_MODULE,
	.fb_set_par	= s1d13xxxfb_set_par,
	.fb_setcolreg	= s1d13xxxfb_setcolreg,
	.fb_blank	= s1d13xxxfb_blank,

	.fb_pan_display	= s1d13xxxfb_pan_display,

	/* to be replaced by any acceleration we can */
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};

static int s1d13xxxfb_width_tab[2][4] __devinitdata = {