blizzard.c 40.4 KB
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/*
 * Epson Blizzard LCD controller driver
 *
 * Copyright (C) 2004-2005 Nokia Corporation
 * Authors:     Juha Yrjola   <juha.yrjola@nokia.com>
 *	        Imre Deak     <imre.deak@nokia.com>
 * YUV support: Jussi Laako   <jussi.laako@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/clk.h>

#include <asm/arch/dma.h>
#include <asm/arch/omapfb.h>
#include <asm/arch/blizzard.h>

#include "dispc.h"

#define MODULE_NAME				"blizzard"

#define BLIZZARD_REV_CODE			0x00
#define BLIZZARD_CONFIG				0x02
#define BLIZZARD_PLL_DIV			0x04
#define BLIZZARD_PLL_LOCK_RANGE			0x06
#define BLIZZARD_PLL_CLOCK_SYNTH_0		0x08
#define BLIZZARD_PLL_CLOCK_SYNTH_1		0x0a
#define BLIZZARD_PLL_MODE			0x0c
#define BLIZZARD_CLK_SRC			0x0e
#define BLIZZARD_MEM_BANK0_ACTIVATE		0x10
#define BLIZZARD_MEM_BANK0_STATUS		0x14
#define BLIZZARD_HDISP				0x2a
#define BLIZZARD_HNDP				0x2c
#define BLIZZARD_VDISP0				0x2e
#define BLIZZARD_VDISP1				0x30
#define BLIZZARD_VNDP				0x32
#define BLIZZARD_HSW				0x34
#define BLIZZARD_VSW				0x38
#define BLIZZARD_DISPLAY_MODE			0x68
#define BLIZZARD_INPUT_WIN_X_START_0		0x6c
#define BLIZZARD_DATA_SOURCE_SELECT		0x8e
#define BLIZZARD_DISP_MEM_DATA_PORT		0x90
#define BLIZZARD_DISP_MEM_READ_ADDR0		0x92
#define BLIZZARD_POWER_SAVE			0xE6
#define BLIZZARD_NDISP_CTRL_STATUS		0xE8

/* Data source select */
/* For S1D13745 */
#define BLIZZARD_SRC_WRITE_LCD_BACKGROUND	0x00
#define BLIZZARD_SRC_WRITE_LCD_DESTRUCTIVE	0x01
#define BLIZZARD_SRC_WRITE_OVERLAY_ENABLE	0x04
#define BLIZZARD_SRC_DISABLE_OVERLAY		0x05
/* For S1D13744 */
#define BLIZZARD_SRC_WRITE_LCD			0x00
#define BLIZZARD_SRC_BLT_LCD			0x06

#define BLIZZARD_COLOR_RGB565			0x01
#define BLIZZARD_COLOR_YUV420			0x09

#define BLIZZARD_VERSION_S1D13745		0x01	/* Hailstorm */
#define BLIZZARD_VERSION_S1D13744		0x02	/* Blizzard */

#define BLIZZARD_AUTO_UPDATE_TIME		(HZ / 20)

/* Reserve 4 request slots for requests in irq context */
#define REQ_POOL_SIZE			24
#define IRQ_REQ_POOL_SIZE		4

#define REQ_FROM_IRQ_POOL 0x01

#define REQ_COMPLETE	0
#define REQ_PENDING	1

struct blizzard_reg_list {
	int	start;
	int	end;
};

/* These need to be saved / restored separately from the rest. */
static struct blizzard_reg_list blizzard_pll_regs[] = {
	{
		.start	= 0x04,		/* Don't save PLL ctrl (0x0C) */
		.end	= 0x0a,
	},
	{
		.start	= 0x0e,		/* Clock configuration */
		.end	= 0x0e,
	},
};

static struct blizzard_reg_list blizzard_gen_regs[] = {
	{
		.start	= 0x18,		/* SDRAM control */
		.end	= 0x20,
	},
	{
		.start	= 0x28,		/* LCD Panel configuration */
		.end	= 0x5a,		/* HSSI interface, TV configuration */
	},
};

static u8 blizzard_reg_cache[0x5a / 2];

struct update_param {
	int	plane;
	int	x, y, width, height;
	int	out_x, out_y;
	int	out_width, out_height;
	int	color_mode;
	int	bpp;
	int	flags;
};

struct blizzard_request {
	struct list_head entry;
	unsigned int	 flags;

	int		 (*handler)(struct blizzard_request *req);
	void		 (*complete)(void *data);
	void		 *complete_data;

	union {
		struct update_param	update;
		struct completion	*sync;
	} par;
};

struct plane_info {
	unsigned long offset;
	int pos_x, pos_y;
	int width, height;
	int out_width, out_height;
	int scr_width;
	int color_mode;
	int bpp;
};

struct blizzard_struct {
	enum omapfb_update_mode	update_mode;
	enum omapfb_update_mode	update_mode_before_suspend;

	struct timer_list	auto_update_timer;
	int			stop_auto_update;
	struct omapfb_update_window	auto_update_window;
	int			enabled_planes;
	int			vid_nonstd_color;
	int			vid_scaled;
	int			last_color_mode;
	int			zoom_on;
	int			screen_width;
	int			screen_height;
	unsigned		te_connected:1;
	unsigned		vsync_only:1;

	struct plane_info	plane[OMAPFB_PLANE_NUM];

	struct blizzard_request	req_pool[REQ_POOL_SIZE];
	struct list_head	pending_req_list;
	struct list_head	free_req_list;
	struct semaphore	req_sema;
	spinlock_t		req_lock;

	unsigned long		sys_ck_rate;
	struct extif_timings	reg_timings, lut_timings;

	u32			max_transmit_size;
	u32			extif_clk_period;
	int			extif_clk_div;
	unsigned long		pix_tx_time;
	unsigned long		line_upd_time;

	struct omapfb_device	*fbdev;
	struct lcd_ctrl_extif	*extif;
	struct lcd_ctrl		*int_ctrl;

	void			(*power_up)(struct device *dev);
	void			(*power_down)(struct device *dev);

	int			version;
} blizzard;

struct lcd_ctrl blizzard_ctrl;

static u8 blizzard_read_reg(u8 reg)
{
	u8 data;

	blizzard.extif->set_bits_per_cycle(8);
	blizzard.extif->write_command(&reg, 1);
	blizzard.extif->read_data(&data, 1);

	return data;
}

static void blizzard_write_reg(u8 reg, u8 val)
{
	blizzard.extif->set_bits_per_cycle(8);
	blizzard.extif->write_command(&reg, 1);
	blizzard.extif->write_data(&val, 1);
}

static void blizzard_restart_sdram(void)
{
	unsigned long tmo;

	blizzard_write_reg(BLIZZARD_MEM_BANK0_ACTIVATE, 0);
	udelay(50);
	blizzard_write_reg(BLIZZARD_MEM_BANK0_ACTIVATE, 1);
	tmo = jiffies + msecs_to_jiffies(200);
	while (!(blizzard_read_reg(BLIZZARD_MEM_BANK0_STATUS) & 0x01)) {
		if (time_after(jiffies, tmo)) {
			dev_err(blizzard.fbdev->dev,
					"s1d1374x: SDRAM not ready");
			break;
		}
		msleep(1);
	}
}

static void blizzard_stop_sdram(void)
{
	blizzard_write_reg(BLIZZARD_MEM_BANK0_ACTIVATE, 0);
}

/* Wait until the last window was completely written into the controllers
 * SDRAM and we can start transferring the next window.
 */
static void blizzard_wait_line_buffer(void)
{
	unsigned long tmo = jiffies + msecs_to_jiffies(30);

	while (blizzard_read_reg(BLIZZARD_NDISP_CTRL_STATUS) & (1 << 7)) {
		if (time_after(jiffies, tmo)) {
			if (printk_ratelimit())
				dev_err(blizzard.fbdev->dev,
					"s1d1374x: line buffer not ready\n");
			break;
		}
	}
}

/* Wait until the YYC color space converter is idle. */
static void blizzard_wait_yyc(void)
{
	unsigned long tmo = jiffies + msecs_to_jiffies(30);

	while (blizzard_read_reg(BLIZZARD_NDISP_CTRL_STATUS) & (1 << 4)) {
		if (time_after(jiffies, tmo)) {
			if (printk_ratelimit())
				dev_err(blizzard.fbdev->dev,
					"s1d1374x: YYC not ready\n");
			break;
		}
	}
}

static void disable_overlay(void)
{
	blizzard_write_reg(BLIZZARD_DATA_SOURCE_SELECT,
				BLIZZARD_SRC_DISABLE_OVERLAY);
}

static void set_window_regs(int x_start, int y_start, int x_end, int y_end,
			    int x_out_start, int y_out_start,
			    int x_out_end, int y_out_end, int color_mode,
			    int zoom_off, int flags)
{
	u8 tmp[18];
	u8 cmd;

	x_end--;
	y_end--;
	tmp[0] = x_start;
	tmp[1] = x_start >> 8;
	tmp[2] = y_start;
	tmp[3] = y_start >> 8;
	tmp[4] = x_end;
	tmp[5] = x_end >> 8;
	tmp[6] = y_end;
	tmp[7] = y_end >> 8;

	x_out_end--;
	y_out_end--;
	tmp[8]  = x_out_start;
	tmp[9]  = x_out_start >> 8;
	tmp[10] = y_out_start;
	tmp[11] = y_out_start >> 8;
	tmp[12] = x_out_end;
	tmp[13] = x_out_end >> 8;
	tmp[14] = y_out_end;
	tmp[15] = y_out_end >> 8;

	tmp[16] = color_mode;
	if (zoom_off && blizzard.version == BLIZZARD_VERSION_S1D13745)
		tmp[17] = BLIZZARD_SRC_WRITE_LCD_BACKGROUND;
	else if (flags & OMAPFB_FORMAT_FLAG_ENABLE_OVERLAY)
		tmp[17] = BLIZZARD_SRC_WRITE_OVERLAY_ENABLE;
	else
		tmp[17] = blizzard.version == BLIZZARD_VERSION_S1D13744 ?
				BLIZZARD_SRC_WRITE_LCD :
				BLIZZARD_SRC_WRITE_LCD_DESTRUCTIVE;

	blizzard.extif->set_bits_per_cycle(8);
	cmd = BLIZZARD_INPUT_WIN_X_START_0;
	blizzard.extif->write_command(&cmd, 1);
	blizzard.extif->write_data(tmp, 18);
}

static void enable_tearsync(int y, int width, int height, int screen_height,
			    int out_height, int force_vsync)
{
	u8 b;

	b = blizzard_read_reg(BLIZZARD_NDISP_CTRL_STATUS);
	b |= 1 << 3;
	blizzard_write_reg(BLIZZARD_NDISP_CTRL_STATUS, b);

	if (likely(blizzard.vsync_only || force_vsync)) {
		blizzard.extif->enable_tearsync(1, 0);
		return;
	}

	if (width * blizzard.pix_tx_time < blizzard.line_upd_time) {
		blizzard.extif->enable_tearsync(1, 0);
		return;
	}

	if ((width * blizzard.pix_tx_time / 1000) * height <
	    (y + out_height) * (blizzard.line_upd_time / 1000)) {
		blizzard.extif->enable_tearsync(1, 0);
		return;
	}

	blizzard.extif->enable_tearsync(1, y + 1);
}

static void disable_tearsync(void)
{
	u8 b;

	blizzard.extif->enable_tearsync(0, 0);
	b = blizzard_read_reg(BLIZZARD_NDISP_CTRL_STATUS);
	b &= ~(1 << 3);
	blizzard_write_reg(BLIZZARD_NDISP_CTRL_STATUS, b);
	b = blizzard_read_reg(BLIZZARD_NDISP_CTRL_STATUS);
}

static inline void set_extif_timings(const struct extif_timings *t);

static inline struct blizzard_request *alloc_req(void)
{
	unsigned long flags;
	struct blizzard_request *req;
	int req_flags = 0;

	if (!in_interrupt())
		down(&blizzard.req_sema);
	else
		req_flags = REQ_FROM_IRQ_POOL;

	spin_lock_irqsave(&blizzard.req_lock, flags);
	BUG_ON(list_empty(&blizzard.free_req_list));
	req = list_entry(blizzard.free_req_list.next,
			 struct blizzard_request, entry);
	list_del(&req->entry);
	spin_unlock_irqrestore(&blizzard.req_lock, flags);

	INIT_LIST_HEAD(&req->entry);
	req->flags = req_flags;

	return req;
}

static inline void free_req(struct blizzard_request *req)
{
	unsigned long flags;

	spin_lock_irqsave(&blizzard.req_lock, flags);

	list_del(&req->entry);
	list_add(&req->entry, &blizzard.free_req_list);
	if (!(req->flags & REQ_FROM_IRQ_POOL))
		up(&blizzard.req_sema);

	spin_unlock_irqrestore(&blizzard.req_lock, flags);
}

static void process_pending_requests(void)
{
	unsigned long flags;

	spin_lock_irqsave(&blizzard.req_lock, flags);

	while (!list_empty(&blizzard.pending_req_list)) {
		struct blizzard_request *req;
		void (*complete)(void *);
		void *complete_data;

		req = list_entry(blizzard.pending_req_list.next,
				 struct blizzard_request, entry);
		spin_unlock_irqrestore(&blizzard.req_lock, flags);

		if (req->handler(req) == REQ_PENDING)
			return;

		complete = req->complete;
		complete_data = req->complete_data;
		free_req(req);

		if (complete)
			complete(complete_data);

		spin_lock_irqsave(&blizzard.req_lock, flags);
	}

	spin_unlock_irqrestore(&blizzard.req_lock, flags);
}

static void submit_req_list(struct list_head *head)
{
	unsigned long flags;
	int process = 1;

	spin_lock_irqsave(&blizzard.req_lock, flags);
	if (likely(!list_empty(&blizzard.pending_req_list)))
		process = 0;
	list_splice_init(head, blizzard.pending_req_list.prev);
	spin_unlock_irqrestore(&blizzard.req_lock, flags);

	if (process)
		process_pending_requests();
}

static void request_complete(void *data)
{
	struct blizzard_request	*req = (struct blizzard_request *)data;
	void			(*complete)(void *);
	void			*complete_data;

	complete = req->complete;
	complete_data = req->complete_data;

	free_req(req);

	if (complete)
		complete(complete_data);

	process_pending_requests();
}


static int do_full_screen_update(struct blizzard_request *req)
{
	int i;
	int flags;

	for (i = 0; i < 3; i++) {
		struct plane_info *p = &blizzard.plane[i];
		if (!(blizzard.enabled_planes & (1 << i))) {
			blizzard.int_ctrl->enable_plane(i, 0);
			continue;
		}
		dev_dbg(blizzard.fbdev->dev, "pw %d ph %d\n",
			p->width, p->height);
		blizzard.int_ctrl->setup_plane(i,
				OMAPFB_CHANNEL_OUT_LCD, p->offset,
				p->scr_width, p->pos_x, p->pos_y,
				p->width, p->height,
				p->color_mode);
		blizzard.int_ctrl->enable_plane(i, 1);
	}

	dev_dbg(blizzard.fbdev->dev, "sw %d sh %d\n",
		blizzard.screen_width, blizzard.screen_height);
	blizzard_wait_line_buffer();
	flags = req->par.update.flags;
	if (flags & OMAPFB_FORMAT_FLAG_TEARSYNC)
		enable_tearsync(0, blizzard.screen_width,
				blizzard.screen_height,
				blizzard.screen_height,
				blizzard.screen_height,
				flags & OMAPFB_FORMAT_FLAG_FORCE_VSYNC);
	else
		disable_tearsync();

	set_window_regs(0, 0, blizzard.screen_width, blizzard.screen_height,
			0, 0, blizzard.screen_width, blizzard.screen_height,
			BLIZZARD_COLOR_RGB565, blizzard.zoom_on, flags);
	blizzard.zoom_on = 0;

	blizzard.extif->set_bits_per_cycle(16);
	/* set_window_regs has left the register index at the right
	 * place, so no need to set it here.
	 */
	blizzard.extif->transfer_area(blizzard.screen_width,
				      blizzard.screen_height,
				      request_complete, req);
	return REQ_PENDING;
}

/* Setup all planes with an overlapping area with the update window. */
static int do_partial_update(struct blizzard_request *req, int plane,
			     int x, int y, int w, int h,
			     int x_out, int y_out, int w_out, int h_out,
			     int wnd_color_mode, int bpp)
{
	int i;
	int gx1, gy1, gx2, gy2;
	int gx1_out, gy1_out, gx2_out, gy2_out;
	int color_mode;
	int flags;
	int zoom_off;

	/* Global coordinates, relative to pixel 0,0 of the LCD */
	gx1 = x + blizzard.plane[plane].pos_x;
	gy1 = y + blizzard.plane[plane].pos_y;
	gx2 = gx1 + w;
	gy2 = gy1 + h;

	flags = req->par.update.flags;
	if (flags & OMAPFB_FORMAT_FLAG_DOUBLE) {
		gx1_out = gx1;
		gy1_out = gy1;
		gx2_out = gx1 + w * 2;
		gy2_out = gy1 + h * 2;
	} else {
		gx1_out = x_out + blizzard.plane[plane].pos_x;
		gy1_out = y_out + blizzard.plane[plane].pos_y;
		gx2_out = gx1_out + w_out;
		gy2_out = gy1_out + h_out;
	}
	zoom_off = blizzard.zoom_on && gx1 == 0 && gy1 == 0 &&
		w == blizzard.screen_width && h == blizzard.screen_height;
	blizzard.zoom_on = (!zoom_off && blizzard.zoom_on) ||
			   (w < w_out || h < h_out);

	for (i = 0; i < OMAPFB_PLANE_NUM; i++) {
		struct plane_info *p = &blizzard.plane[i];
		int px1, py1;
		int px2, py2;
		int pw, ph;
		int pposx, pposy;
		unsigned long offset;

		if (!(blizzard.enabled_planes & (1 << i))  ||
		    (wnd_color_mode && i != plane)) {
			blizzard.int_ctrl->enable_plane(i, 0);
			continue;
		}
		/* Plane coordinates */
		if (i == plane) {
			/* Plane in which we are doing the update.
			 * Local coordinates are the one in the update
			 * request.
			 */
			px1 = x;
			py1 = y;
			px2 = x + w;
			py2 = y + h;
			pposx = 0;
			pposy = 0;
		} else {
			/* Check if this plane has an overlapping part */
			px1 = gx1 - p->pos_x;
			py1 = gy1 - p->pos_y;
			px2 = gx2 - p->pos_x;
			py2 = gy2 - p->pos_y;
			if (px1 >= p->width || py1 >= p->height ||
			    px2 <= 0 || py2 <= 0) {
				blizzard.int_ctrl->enable_plane(i, 0);
				continue;
			}
			/* Calculate the coordinates for the overlapping
			 * part in the plane's local coordinates.
			 */
			pposx = -px1;
			pposy = -py1;
			if (px1 < 0)
				px1 = 0;
			if (py1 < 0)
				py1 = 0;
			if (px2 > p->width)
				px2 = p->width;
			if (py2 > p->height)
				py2 = p->height;
			if (pposx < 0)
				pposx = 0;
			if (pposy < 0)
				pposy = 0;
		}
		pw = px2 - px1;
		ph = py2 - py1;
		offset = p->offset + (p->scr_width * py1 + px1) * p->bpp / 8;
		if (wnd_color_mode)
			/* Window embedded in the plane with a differing
			 * color mode / bpp. Calculate the number of DMA
			 * transfer elements in terms of the plane's bpp.
			 */
			pw = (pw + 1) * bpp / p->bpp;
#ifdef VERBOSE
		dev_dbg(blizzard.fbdev->dev,
			"plane %d offset %#08lx pposx %d pposy %d "
			"px1 %d py1 %d pw %d ph %d\n",
			i, offset, pposx, pposy, px1, py1, pw, ph);
#endif
		blizzard.int_ctrl->setup_plane(i,
				OMAPFB_CHANNEL_OUT_LCD, offset,
				p->scr_width,
				pposx, pposy, pw, ph,
				p->color_mode);

		blizzard.int_ctrl->enable_plane(i, 1);
	}

	switch (wnd_color_mode) {
	case OMAPFB_COLOR_YUV420:
		color_mode = BLIZZARD_COLOR_YUV420;
		/* Currently only the 16 bits/pixel cycle format is
		 * supported on the external interface. Adjust the number
		 * of transfer elements per line for 12bpp format.
		 */
		w = (w + 1) * 3 / 4;
		break;
	default:
		color_mode = BLIZZARD_COLOR_RGB565;
		break;
	}

	blizzard_wait_line_buffer();
	if (blizzard.last_color_mode == BLIZZARD_COLOR_YUV420)
		blizzard_wait_yyc();
	blizzard.last_color_mode = color_mode;
	if (flags & OMAPFB_FORMAT_FLAG_TEARSYNC)
		enable_tearsync(gy1, w, h,
				blizzard.screen_height,
				h_out,
				flags & OMAPFB_FORMAT_FLAG_FORCE_VSYNC);
	else
		disable_tearsync();

	set_window_regs(gx1, gy1, gx2, gy2, gx1_out, gy1_out, gx2_out, gy2_out,
			color_mode, zoom_off, flags);

	blizzard.extif->set_bits_per_cycle(16);
	/* set_window_regs has left the register index at the right
	 * place, so no need to set it here.
	 */
	blizzard.extif->transfer_area(w, h, request_complete, req);

	return REQ_PENDING;
}

static int send_frame_handler(struct blizzard_request *req)
{
	struct update_param *par = &req->par.update;
	int plane = par->plane;

#ifdef VERBOSE
	dev_dbg(blizzard.fbdev->dev,
		"send_frame: x %d y %d w %d h %d "
		"x_out %d y_out %d w_out %d h_out %d "
		"color_mode %04x flags %04x planes %01x\n",
		par->x, par->y, par->width, par->height,
		par->out_x, par->out_y, par->out_width, par->out_height,
		par->color_mode, par->flags, blizzard.enabled_planes);
#endif
	if (par->flags & OMAPFB_FORMAT_FLAG_DISABLE_OVERLAY)
		disable_overlay();

	if ((blizzard.enabled_planes & blizzard.vid_nonstd_color) ||
	     (blizzard.enabled_planes & blizzard.vid_scaled))
		return do_full_screen_update(req);

	return do_partial_update(req, plane, par->x, par->y,
				 par->width, par->height,
				 par->out_x, par->out_y,
				 par->out_width, par->out_height,
				 par->color_mode, par->bpp);
}

static void send_frame_complete(void *data)
{
}

#define ADD_PREQ(_x, _y, _w, _h, _x_out, _y_out, _w_out, _h_out) do {	\
	req = alloc_req();			\
	req->handler	= send_frame_handler;	\
	req->complete	= send_frame_complete;	\
	req->par.update.plane = plane_idx;	\
	req->par.update.x = _x;			\
	req->par.update.y = _y;			\
	req->par.update.width  = _w;		\
	req->par.update.height = _h;		\
	req->par.update.out_x = _x_out;		\
	req->par.update.out_y = _y_out;		\
	req->par.update.out_width = _w_out;	\
	req->par.update.out_height = _h_out;	\
	req->par.update.bpp = bpp;		\
	req->par.update.color_mode = color_mode;\
	req->par.update.flags	  = flags;	\
	list_add_tail(&req->entry, req_head);	\
} while(0)

static void create_req_list(int plane_idx,
			    struct omapfb_update_window *win,
			    struct list_head *req_head)
{
	struct blizzard_request *req;
	int x = win->x;
	int y = win->y;
	int width = win->width;
	int height = win->height;
	int x_out = win->out_x;
	int y_out = win->out_y;
	int width_out = win->out_width;
	int height_out = win->out_height;
	int color_mode;
	int bpp;
	int flags;
	unsigned int ystart = y;
	unsigned int yspan = height;
	unsigned int ystart_out = y_out;
	unsigned int yspan_out = height_out;

	flags = win->format & ~OMAPFB_FORMAT_MASK;
	color_mode = win->format & OMAPFB_FORMAT_MASK;
	switch (color_mode) {
	case OMAPFB_COLOR_YUV420:
		/* Embedded window with different color mode */
		bpp = 12;
		/* X, Y, height must be aligned at 2, width at 4 pixels */
		x &= ~1;
		y &= ~1;
		height = yspan = height & ~1;
		width = width & ~3;
		break;
	default:
		/* Same as the plane color mode */
		bpp = blizzard.plane[plane_idx].bpp;
		break;
	}
	if (width * height * bpp / 8 > blizzard.max_transmit_size) {
		yspan = blizzard.max_transmit_size / (width * bpp / 8);
		yspan_out = yspan * height_out / height;
		ADD_PREQ(x, ystart, width, yspan, x_out, ystart_out,
			 width_out, yspan_out);
		ystart += yspan;
		ystart_out += yspan_out;
		yspan = height - yspan;
		yspan_out = height_out - yspan_out;
		flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
	}

	ADD_PREQ(x, ystart, width, yspan, x_out, ystart_out,
		 width_out, yspan_out);
}

static void auto_update_complete(void *data)
{
	if (!blizzard.stop_auto_update)
		mod_timer(&blizzard.auto_update_timer,
			  jiffies + BLIZZARD_AUTO_UPDATE_TIME);
}

static void blizzard_update_window_auto(unsigned long arg)
{
	LIST_HEAD(req_list);
	struct blizzard_request *last;
	struct omapfb_plane_struct *plane;

	plane = blizzard.fbdev->fb_info[0]->par;
	create_req_list(plane->idx,
			&blizzard.auto_update_window, &req_list);
	last = list_entry(req_list.prev, struct blizzard_request, entry);

	last->complete = auto_update_complete;
	last->complete_data = NULL;

	submit_req_list(&req_list);
}

int blizzard_update_window_async(struct fb_info *fbi,
				 struct omapfb_update_window *win,
				 void (*complete_callback)(void *arg),
				 void *complete_callback_data)
{
	LIST_HEAD(req_list);
	struct blizzard_request *last;
	struct omapfb_plane_struct *plane = fbi->par;

	if (unlikely(blizzard.update_mode != OMAPFB_MANUAL_UPDATE))
		return -EINVAL;
	if (unlikely(!blizzard.te_connected &&
		     (win->format & OMAPFB_FORMAT_FLAG_TEARSYNC)))
		return -EINVAL;

	create_req_list(plane->idx, win, &req_list);
	last = list_entry(req_list.prev, struct blizzard_request, entry);

	last->complete = complete_callback;
	last->complete_data = (void *)complete_callback_data;

	submit_req_list(&req_list);

	return 0;
}
EXPORT_SYMBOL(blizzard_update_window_async);

static int update_full_screen(void)
{
	return blizzard_update_window_async(blizzard.fbdev->fb_info[0],
				     &blizzard.auto_update_window, NULL, NULL);

}

static int blizzard_setup_plane(int plane, int channel_out,
				  unsigned long offset, int screen_width,
				  int pos_x, int pos_y, int width, int height,
				  int color_mode)
{
	struct plane_info *p;

#ifdef VERBOSE
	dev_dbg(blizzard.fbdev->dev,
		    "plane %d ch_out %d offset %#08lx scr_width %d "
		    "pos_x %d pos_y %d width %d height %d color_mode %d\n",
		    plane, channel_out, offset, screen_width,
		    pos_x, pos_y, width, height, color_mode);
#endif
	if ((unsigned)plane > OMAPFB_PLANE_NUM)
		return -EINVAL;
	p = &blizzard.plane[plane];

	switch (color_mode) {
	case OMAPFB_COLOR_YUV422:
	case OMAPFB_COLOR_YUY422:
		p->bpp = 16;
		blizzard.vid_nonstd_color &= ~(1 << plane);
		break;
	case OMAPFB_COLOR_YUV420:
		p->bpp = 12;
		blizzard.vid_nonstd_color |= 1 << plane;
		break;
	case OMAPFB_COLOR_RGB565:
		p->bpp = 16;
		blizzard.vid_nonstd_color &= ~(1 << plane);
		break;
	default:
		return -EINVAL;
	}

	p->offset = offset;
	p->pos_x = pos_x;
	p->pos_y = pos_y;
	p->width = width;
	p->height = height;
	p->scr_width = screen_width;
	if (!p->out_width)
		p->out_width = width;
	if (!p->out_height)
		p->out_height = height;

	p->color_mode = color_mode;

	return 0;
}

static int blizzard_set_scale(int plane, int orig_w, int orig_h,
			      int out_w, int out_h)
{
	struct plane_info *p = &blizzard.plane[plane];
	int r;

	dev_dbg(blizzard.fbdev->dev,
		"plane %d orig_w %d orig_h %d out_w %d out_h %d\n",
		plane, orig_w, orig_h, out_w, out_h);
	if ((unsigned)plane > OMAPFB_PLANE_NUM)
		return -ENODEV;

	r = blizzard.int_ctrl->set_scale(plane, orig_w, orig_h, out_w, out_h);
	if (r < 0)
		return r;

	p->width = orig_w;
	p->height = orig_h;
	p->out_width = out_w;
	p->out_height = out_h;
	if (orig_w == out_w && orig_h == out_h)
		blizzard.vid_scaled &= ~(1 << plane);
	else
		blizzard.vid_scaled |= 1 << plane;

	return 0;
}

static int blizzard_enable_plane(int plane, int enable)
{
	if (enable)
		blizzard.enabled_planes |= 1 << plane;
	else
		blizzard.enabled_planes &= ~(1 << plane);

	return 0;
}

static int sync_handler(struct blizzard_request *req)
{
	complete(req->par.sync);
	return REQ_COMPLETE;
}

static void blizzard_sync(void)
{
	LIST_HEAD(req_list);
	struct blizzard_request *req;
	struct completion comp;

	req = alloc_req();

	req->handler = sync_handler;
	req->complete = NULL;
	init_completion(&comp);
	req->par.sync = &comp;

	list_add(&req->entry, &req_list);
	submit_req_list(&req_list);

	wait_for_completion(&comp);
}


static void blizzard_bind_client(struct omapfb_notifier_block *nb)
{
	if (blizzard.update_mode == OMAPFB_MANUAL_UPDATE) {
		omapfb_notify_clients(blizzard.fbdev, OMAPFB_EVENT_READY);
	}
}

static int blizzard_set_update_mode(enum omapfb_update_mode mode)
{
	if (unlikely(mode != OMAPFB_MANUAL_UPDATE &&
		     mode != OMAPFB_AUTO_UPDATE &&
		     mode != OMAPFB_UPDATE_DISABLED))
		return -EINVAL;

	if (mode == blizzard.update_mode)
		return 0;

	dev_info(blizzard.fbdev->dev, "s1d1374x: setting update mode to %s\n",
			mode == OMAPFB_UPDATE_DISABLED ? "disabled" :
			(mode == OMAPFB_AUTO_UPDATE ? "auto" : "manual"));

	switch (blizzard.update_mode) {
	case OMAPFB_MANUAL_UPDATE:
		omapfb_notify_clients(blizzard.fbdev, OMAPFB_EVENT_DISABLED);
		break;
	case OMAPFB_AUTO_UPDATE:
		blizzard.stop_auto_update = 1;
		del_timer_sync(&blizzard.auto_update_timer);
		break;
	case OMAPFB_UPDATE_DISABLED:
		break;
	}

	blizzard.update_mode = mode;
	blizzard_sync();
	blizzard.stop_auto_update = 0;

	switch (mode) {
	case OMAPFB_MANUAL_UPDATE:
		omapfb_notify_clients(blizzard.fbdev, OMAPFB_EVENT_READY);
		break;
	case OMAPFB_AUTO_UPDATE:
		blizzard_update_window_auto(0);
		break;
	case OMAPFB_UPDATE_DISABLED:
		break;
	}

	return 0;
}

static enum omapfb_update_mode blizzard_get_update_mode(void)
{
	return blizzard.update_mode;