fsl-diu-fb.c

Linux环境下视频显示卡设备的驱动程序源代码

		var->green.length = 6;
		var->green.offset = 5;
		var->green.msb_right = 0;

		var->blue.length = 5;
		var->blue.offset = 0;
		var->blue.msb_right = 0;

		var->transp.length = 0;
		var->transp.offset = 0;
		var->transp.msb_right = 0;
		break;
	case 24:
		var->red.length = 8;
		var->red.offset = 0;
		var->red.msb_right = 0;

		var->green.length = 8;
		var->green.offset = 8;
		var->green.msb_right = 0;

		var->blue.length = 8;
		var->blue.offset = 16;
		var->blue.msb_right = 0;

		var->transp.length = 0;
		var->transp.offset = 0;
		var->transp.msb_right = 0;
		break;
	case 32:
		var->red.length = 8;
		var->red.offset = 16;
		var->red.msb_right = 0;

		var->green.length = 8;
		var->green.offset = 8;
		var->green.msb_right = 0;

		var->blue.length = 8;
		var->blue.offset = 0;
		var->blue.msb_right = 0;

		var->transp.length = 8;
		var->transp.offset = 24;
		var->transp.msb_right = 0;

		break;
	}
	/* If the pixclock is below the minimum spec'd value then set to
	 * refresh rate for 60Hz since this is supported by most monitors.
	 * Refer to Documentation/fb/ for calculations.
	 */
	if ((var->pixclock < MIN_PIX_CLK) || (var->pixclock > MAX_PIX_CLK)) {
		htotal = var->xres + var->right_margin + var->hsync_len +
		    var->left_margin;
		vtotal = var->yres + var->lower_margin + var->vsync_len +
		    var->upper_margin;
		var->pixclock = (vtotal * htotal * 6UL) / 100UL;
		var->pixclock = KHZ2PICOS(var->pixclock);
		pr_debug("pixclock set for 60Hz refresh = %u ps\n",
			var->pixclock);
	}

	var->height = -1;
	var->width = -1;
	var->grayscale = 0;

	/* Copy nonstd field to/from sync for fbset usage */
	var->sync |= var->nonstd;
	var->nonstd |= var->sync;

	adjust_aoi_size_position(var, info);
	return 0;
}

static void set_fix(struct fb_info *info)
{
	struct fb_fix_screeninfo *fix = &info->fix;
	struct fb_var_screeninfo *var = &info->var;
	struct mfb_info *mfbi = info->par;

	strncpy(fix->id, mfbi->id, strlen(mfbi->id));
	fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
	fix->type = FB_TYPE_PACKED_PIXELS;
	fix->accel = FB_ACCEL_NONE;
	fix->visual = FB_VISUAL_TRUECOLOR;
	fix->xpanstep = 1;
	fix->ypanstep = 1;
}

static void update_lcdc(struct fb_info *info)
{
	struct fb_var_screeninfo *var = &info->var;
	struct mfb_info *mfbi = info->par;
	struct fsl_diu_data *machine_data = mfbi->parent;
	struct diu *hw;
	int i, j;
	char __iomem *cursor_base, *gamma_table_base;

	u32 temp;

	hw = dr.diu_reg;

	if (mfbi->type == MFB_TYPE_OFF) {
		fsl_diu_disable_panel(info);
		return;
	}

	diu_ops.set_monitor_port(machine_data->monitor_port);
	gamma_table_base = pool.gamma.vaddr;
	cursor_base = pool.cursor.vaddr;
	/* Prep for DIU init  - gamma table, cursor table */

	for (i = 0; i <= 2; i++)
	   for (j = 0; j <= 255; j++)
	      *gamma_table_base++ = j;

	diu_ops.set_gamma_table(machine_data->monitor_port, pool.gamma.vaddr);

	pr_debug("update-lcdc: HW - %p\n Disabling DIU\n", hw);
	disable_lcdc(info);

	/* Program DIU registers */

	out_be32(&hw->gamma, pool.gamma.paddr);
	out_be32(&hw->cursor, pool.cursor.paddr);

	out_be32(&hw->bgnd, 0x007F7F7F); 	/* BGND */
	out_be32(&hw->bgnd_wb, 0); 		/* BGND_WB */
	out_be32(&hw->disp_size, (var->yres << 16 | var->xres));
						/* DISP SIZE */
	pr_debug("DIU xres: %d\n", var->xres);
	pr_debug("DIU yres: %d\n", var->yres);

	out_be32(&hw->wb_size, 0); /* WB SIZE */
	out_be32(&hw->wb_mem_addr, 0); /* WB MEM ADDR */

	/* Horizontal and vertical configuration register */
	temp = var->left_margin << 22 | /* BP_H */
	       var->hsync_len << 11 |   /* PW_H */
	       var->right_margin;       /* FP_H */

	out_be32(&hw->hsyn_para, temp);

	temp = var->upper_margin << 22 | /* BP_V */
	       var->vsync_len << 11 |    /* PW_V  */
	       var->lower_margin;        /* FP_V  */

	out_be32(&hw->vsyn_para, temp);

	pr_debug("DIU right_margin - %d\n", var->right_margin);
	pr_debug("DIU left_margin - %d\n", var->left_margin);
	pr_debug("DIU hsync_len - %d\n", var->hsync_len);
	pr_debug("DIU upper_margin - %d\n", var->upper_margin);
	pr_debug("DIU lower_margin - %d\n", var->lower_margin);
	pr_debug("DIU vsync_len - %d\n", var->vsync_len);
	pr_debug("DIU HSYNC - 0x%08x\n", hw->hsyn_para);
	pr_debug("DIU VSYNC - 0x%08x\n", hw->vsyn_para);

	diu_ops.set_pixel_clock(var->pixclock);

	out_be32(&hw->syn_pol, 0);	/* SYNC SIGNALS POLARITY */
	out_be32(&hw->thresholds, 0x00037800); /* The Thresholds */
	out_be32(&hw->int_status, 0);	/* INTERRUPT STATUS */
	out_be32(&hw->plut, 0x01F5F666);

	/* Enable the DIU */
	enable_lcdc(info);
}

static int map_video_memory(struct fb_info *info)
{
	phys_addr_t phys;

	pr_debug("info->var.xres_virtual = %d\n", info->var.xres_virtual);
	pr_debug("info->var.yres_virtual = %d\n", info->var.yres_virtual);
	pr_debug("info->fix.line_length  = %d\n", info->fix.line_length);

	info->fix.smem_len = info->fix.line_length * info->var.yres_virtual;
	pr_debug("MAP_VIDEO_MEMORY: smem_len = %d\n", info->fix.smem_len);
	info->screen_base = fsl_diu_alloc(info->fix.smem_len, &phys);
	if (info->screen_base == NULL) {
		printk(KERN_ERR "Unable to allocate fb memory\n");
		return -ENOMEM;
	}
	info->fix.smem_start = (unsigned long) phys;
	info->screen_size = info->fix.smem_len;

	pr_debug("Allocated fb @ paddr=0x%08lx, size=%d.\n",
				info->fix.smem_start,
		info->fix.smem_len);
	pr_debug("screen base %p\n", info->screen_base);

	return 0;
}

static void unmap_video_memory(struct fb_info *info)
{
	fsl_diu_free(info->screen_base, info->fix.smem_len);
	info->screen_base = NULL;
	info->fix.smem_start = 0;
	info->fix.smem_len = 0;
}

/*
 * Using the fb_var_screeninfo in fb_info we set the aoi of this
 * particular framebuffer. It is a light version of fsl_diu_set_par.
 */
static int fsl_diu_set_aoi(struct fb_info *info)
{
	struct fb_var_screeninfo *var = &info->var;
	struct mfb_info *mfbi = info->par;
	struct diu_ad *ad = mfbi->ad;

	/* AOI should not be greater than display size */
	ad->offset_xyi = cpu_to_le32((var->yoffset << 16) | var->xoffset);
	ad->offset_xyd = cpu_to_le32((mfbi->y_aoi_d << 16) | mfbi->x_aoi_d);
	return 0;
}

/*
 * Using the fb_var_screeninfo in fb_info we set the resolution of this
 * particular framebuffer. This function alters the fb_fix_screeninfo stored
 * in fb_info. It does 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. fsl_diu_check_var is always called before
 * fsl_diu_set_par to ensure this.
 */
static int fsl_diu_set_par(struct fb_info *info)
{
	unsigned long len;
	struct fb_var_screeninfo *var = &info->var;
	struct mfb_info *mfbi = info->par;
	struct fsl_diu_data *machine_data = mfbi->parent;
	struct diu_ad *ad = mfbi->ad;
	struct diu *hw;

	hw = dr.diu_reg;

	set_fix(info);
	mfbi->cursor_reset = 1;

	len = info->var.yres_virtual * info->fix.line_length;
	/* Alloc & dealloc each time resolution/bpp change */
	if (len != info->fix.smem_len) {
		if (info->fix.smem_start)
			unmap_video_memory(info);
		pr_debug("SET PAR: smem_len = %d\n", info->fix.smem_len);

		/* Memory allocation for framebuffer */
		if (map_video_memory(info)) {
			printk(KERN_ERR "Unable to allocate fb memory 1\n");
			return -ENOMEM;
		}
	}

	ad->pix_fmt =
		diu_ops.get_pixel_format(var->bits_per_pixel,
					 machine_data->monitor_port);
	ad->addr    = cpu_to_le32(info->fix.smem_start);
	ad->src_size_g_alpha = cpu_to_le32((var->yres_virtual << 12) |
				var->xres_virtual) | mfbi->g_alpha;
	/* AOI should not be greater than display size */
	ad->aoi_size 	= cpu_to_le32((var->yres << 16) | var->xres);
	ad->offset_xyi = cpu_to_le32((var->yoffset << 16) | var->xoffset);
	ad->offset_xyd = cpu_to_le32((mfbi->y_aoi_d << 16) | mfbi->x_aoi_d);

	/* Disable chroma keying function */
	ad->ckmax_r = 0;
	ad->ckmax_g = 0;
	ad->ckmax_b = 0;

	ad->ckmin_r = 255;
	ad->ckmin_g = 255;
	ad->ckmin_b = 255;

	if (mfbi->index == 0)
		update_lcdc(info);
	return 0;
}

static inline __u32 CNVT_TOHW(__u32 val, __u32 width)
{
	return ((val<<width) + 0x7FFF - val)>>16;
}

/*
 * Set a single color register. The values supplied have a 16 bit magnitude
 * which needs to be scaled in this function for the hardware. Things to take
 * into consideration are how many color registers, if any, are supported with
 * the current color visual. With truecolor mode no color palettes are
 * supported. Here a psuedo palette is created which we store the value in
 * pseudo_palette in struct fb_info. For pseudocolor mode we have a limited
 * color palette.
 */
static int fsl_diu_setcolreg(unsigned regno, unsigned red, unsigned green,
			   unsigned blue, unsigned transp, struct fb_info *info)
{
	int ret = 1;

	/*
	 * If greyscale is true, then we convert the RGB value
	 * to greyscale no matter what visual we are using.
	 */
	if (info->var.grayscale)
		red = green = blue = (19595 * red + 38470 * green +
				      7471 * blue) >> 16;
	switch (info->fix.visual) {
	case FB_VISUAL_TRUECOLOR:
		/*
		 * 16-bit True Colour.  We encode the RGB value
		 * according to the RGB bitfield information.
		 */
		if (regno < 16) {
			u32 *pal = info->pseudo_palette;
			u32 v;

			red = CNVT_TOHW(red, info->var.red.length);
			green = CNVT_TOHW(green, info->var.green.length);
			blue = CNVT_TOHW(blue, info->var.blue.length);
			transp = CNVT_TOHW(transp, info->var.transp.length);

			v = (red << info->var.red.offset) |
			    (green << info->var.green.offset) |
			    (blue << info->var.blue.offset) |
			    (transp << info->var.transp.offset);

			pal[regno] = v;
			ret = 0;
		}
		break;
	case FB_VISUAL_STATIC_PSEUDOCOLOR:
	case FB_VISUAL_PSEUDOCOLOR:
		break;
	}

	return ret;
}

/*
 * Pan (or wrap, depending on the `vmode' field) the display using the
 * 'xoffset' and 'yoffset' fields of the 'var' structure. If the values
 * don't fit, return -EINVAL.
 */
static int fsl_diu_pan_display(struct fb_var_screeninfo *var,
			     struct fb_info *info)
{
	if ((info->var.xoffset == var->xoffset) &&
	    (info->var.yoffset == var->yoffset))
		return 0;	/* No change, do nothing */

	if (var->xoffset < 0 || var->yoffset < 0
	    || var->xoffset + info->var.xres > info->var.xres_virtual
	    || var->yoffset + info->var.yres > info->var.yres_virtual)
		return -EINVAL;

	info->var.xoffset = var->xoffset;
	info->var.yoffset = var->yoffset;

	if (var->vmode & FB_VMODE_YWRAP)
		info->var.vmode |= FB_VMODE_YWRAP;
	else
		info->var.vmode &= ~FB_VMODE_YWRAP;

	fsl_diu_set_aoi(info);

	return 0;
}

/*
 * Blank the screen if blank_mode != 0, else unblank. Return 0 if blanking
 * succeeded, != 0 if un-/blanking failed.
 * blank_mode == 2: suspend vsync
 * blank_mode == 3: suspend hsync
 * blank_mode == 4: powerdown
 */
static int fsl_diu_blank(int blank_mode, struct fb_info *info)
{
	struct mfb_info *mfbi = info->par;

	mfbi->blank = blank_mode;

	switch (blank_mode) {
	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_HSYNC_SUSPEND:
	/* FIXME: fixes to enable_panel and enable lcdc needed */
	case FB_BLANK_NORMAL:
	/*	fsl_diu_disable_panel(info);*/
		break;
	case FB_BLANK_POWERDOWN:
	/*	disable_lcdc(info);	*/
		break;
	case FB_BLANK_UNBLANK:
	/*	fsl_diu_enable_panel(info);*/
		break;
	}

	return 0;
}

static int fsl_diu_ioctl(struct fb_info *info, unsigned int cmd,
		       unsigned long arg)
{
	struct mfb_info *mfbi = info->par;
	struct diu_ad *ad = mfbi->ad;
	struct mfb_chroma_key ck;
	unsigned char global_alpha;
	struct aoi_display_offset aoi_d;
	__u32 pix_fmt;
	void __user *buf = (void __user *)arg;

	if (!arg)
		return -EINVAL;
	switch (cmd) {
	case MFB_SET_PIXFMT:
		if (copy_from_user(&pix_fmt, buf, sizeof(pix_fmt)))
			return -EFAULT;
		ad->pix_fmt = pix_fmt;
		pr_debug("Set pixel format to 0x%08x\n", ad->pix_fmt);
		break;
	case MFB_GET_PIXFMT:
		pix_fmt = ad->pix_fmt;
		if (copy_to_user(buf, &pix_fmt, sizeof(pix_fmt)))
			return -EFAULT;
		pr_debug("get pixel format 0x%08x\n", ad->pix_fmt);
		break;
	case MFB_SET_AOID:
		if (copy_from_user(&aoi_d, buf, sizeof(aoi_d)))
			return -EFAULT;
		mfbi->x_aoi_d = aoi_d.x_aoi_d;
		mfbi->y_aoi_d = aoi_d.y_aoi_d;
		pr_debug("set AOI display offset of index %d to (%d,%d)\n",
				 mfbi->index, aoi_d.x_aoi_d, aoi_d.y_aoi_d);
		fsl_diu_check_var(&info->var, info);
		fsl_diu_set_aoi(info);
		break;
	case MFB_GET_AOID:
		aoi_d.x_aoi_d = mfbi->x_aoi_d;
		aoi_d.y_aoi_d = mfbi->y_aoi_d;
		if (copy_to_user(buf, &aoi_d, sizeof(aoi_d)))
			return -EFAULT;
		pr_debug("get AOI display offset of index %d (%d,%d)\n",
				mfbi->index, aoi_d.x_aoi_d, aoi_d.y_aoi_d);
		break;
	case MFB_GET_ALPHA:
		global_alpha = mfbi->g_alpha;
		if (copy_to_user(buf, &global_alpha, sizeof(global_alpha)))
			return -EFAULT;
		pr_debug("get global alpha of index %d\n", mfbi->index);
		break;
	case MFB_SET_ALPHA:
		/* set panel information */
		if (copy_from_user(&global_alpha, buf, sizeof(global_alpha)))
			return -EFAULT;
		ad->src_size_g_alpha = (ad->src_size_g_alpha & (~0xff)) |
							(global_alpha & 0xff);
		mfbi->g_alpha = global_alpha;
		pr_debug("set global alpha for index %d\n", mfbi->index);
		break;
	case MFB_SET_CHROMA_KEY:
		/* set panel winformation */
		if (copy_from_user(&ck, buf, sizeof(ck)))
			return -EFAULT;

		if (ck.enable &&
		   (ck.red_max < ck.red_min ||
		    ck.green_max < ck.green_min ||
		    ck.blue_max < ck.blue_min))
			return -EINVAL;

		if (!ck.enable) {
			ad->ckmax_r = 0;
			ad->ckmax_g = 0;
			ad->ckmax_b = 0;
			ad->ckmin_r = 255;
			ad->ckmin_g = 255;
			ad->ckmin_b = 255;
		} else {
			ad->ckmax_r = ck.red_max;
			ad->ckmax_g = ck.green_max;
			ad->ckmax_b = ck.blue_max;
			ad->ckmin_r = ck.red_min;
			ad->ckmin_g = ck.green_min;
			ad->ckmin_b = ck.blue_min;
		}
		pr_debug("set chroma key\n");
		break;
	case FBIOGET_GWINFO:
		if (mfbi->type == MFB_TYPE_OFF)
			return -ENODEV;
		/* get graphic window information */
		if (copy_to_user(buf, ad, sizeof(*ad)))
			return -EFAULT;
		break;
	case FBIOGET_HWCINFO:
		pr_debug("FBIOGET_HWCINFO:0x%08x\n", FBIOGET_HWCINFO);
		break;
	case FBIOPUT_MODEINFO:
		pr_debug("FBIOPUT_MODEINFO:0x%08x\n", FBIOPUT_MODEINFO);
		break;
	case FBIOGET_DISPINFO:
		pr_debug("FBIOGET_DISPINFO:0x%08x\n", FBIOGET_DISPINFO);
		break;

	default:
		printk(KERN_ERR "Unknown ioctl command (0x%08X)\n", cmd);
		return -ENOIOCTLCMD;
	}

	return 0;
}

/* turn on fb if count == 1
 */
static int fsl_diu_open(struct fb_info *info, int user)
{
	struct mfb_info *mfbi = info->par;
	int res = 0;

	spin_lock(&diu_lock);
	mfbi->count++;
	if (mfbi->count == 1) {
		pr_debug("open plane index %d\n", mfbi->index);
		fsl_diu_check_var(&info->var, info);
		res = fsl_diu_set_par(info);
		if (res < 0)
			mfbi->count--;
		else {
			res = fsl_diu_enable_panel(info);
			if (res < 0)
				mfbi->count--;
		}
	}

	spin_unlock(&diu_lock);
	return res;
}

/* turn off fb if count == 0
 */
static int fsl_diu_release(struct fb_info *info, int user)
{
	struct mfb_info *mfbi = info->par;
	int res = 0;

	spin_lock(&diu_lock);
	mfbi->count--;
	if (mfbi->count == 0) {
		pr_debug("release plane index %d\n", mfbi->index);
		res = fsl_diu_disable_panel(info);
		if (res < 0)
			mfbi->count++;
	}
	spin_unlock(&diu_lock);
	return res;
}

static struct fb_ops fsl_diu_ops = {
	.owner = THIS_MODULE,
	.fb_check_var = fsl_diu_check_var,
	.fb_set_par = fsl_diu_set_par,
	.fb_setcolreg = fsl_diu_setcolreg,
	.fb_blank = fsl_diu_blank,
	.fb_pan_display = fsl_diu_pan_display,
	.fb_fillrect = cfb_fillrect,
	.fb_copyarea = cfb_copyarea,
	.fb_imageblit = cfb_imageblit,
	.fb_ioctl = fsl_diu_ioctl,
	.fb_open = fsl_diu_open,
	.fb_release = fsl_diu_release,
};

static int init_fbinfo(struct fb_info *info)
{
	struct mfb_info *mfbi = info->par;

	info->device = NULL;