/*
   * SuperH Mobile LCDC Framebuffer
   *
   * Copyright (c) 2008 Magnus Damm
   *
   * 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/kernel.h>
  #include <linux/init.h>
  #include <linux/delay.h>
  #include <linux/mm.h>

  #include <linux/clk.h>

  #include <linux/pm_runtime.h>

  #include <linux/platform_device.h>
  #include <linux/dma-mapping.h>

  #include <linux/interrupt.h>

  #include <linux/videodev2.h>

  #include <linux/vmalloc.h>

  #include <linux/ioctl.h>

  #include <linux/slab.h>

  #include <linux/console.h>

  #include <linux/backlight.h>
  #include <linux/gpio.h>

  #include <linux/module.h>

  #include <video/sh_mobile_lcdc.h>

  #include <video/sh_mobile_meram.h>

  #include <linux/atomic.h>

  #include "sh_mobile_lcdcfb.h"

  #define SIDE_B_OFFSET 0x1000
  #define MIRROR_OFFSET 0x2000

  #define MAX_XRES 1920
  #define MAX_YRES 1080

  static unsigned long lcdc_offs_mainlcd[NR_CH_REGS] = {

  	[LDDCKPAT1R] = 0x400,
  	[LDDCKPAT2R] = 0x404,
  	[LDMT1R] = 0x418,
  	[LDMT2R] = 0x41c,
  	[LDMT3R] = 0x420,
  	[LDDFR] = 0x424,
  	[LDSM1R] = 0x428,

  	[LDSM2R] = 0x42c,

  	[LDSA1R] = 0x430,

  	[LDSA2R] = 0x434,

  	[LDMLSR] = 0x438,
  	[LDHCNR] = 0x448,
  	[LDHSYNR] = 0x44c,
  	[LDVLNR] = 0x450,
  	[LDVSYNR] = 0x454,
  	[LDPMR] = 0x460,

  	[LDHAJR] = 0x4a0,

  };

  static unsigned long lcdc_offs_sublcd[NR_CH_REGS] = {

  	[LDDCKPAT1R] = 0x408,
  	[LDDCKPAT2R] = 0x40c,
  	[LDMT1R] = 0x600,
  	[LDMT2R] = 0x604,
  	[LDMT3R] = 0x608,
  	[LDDFR] = 0x60c,
  	[LDSM1R] = 0x610,

  	[LDSM2R] = 0x614,

  	[LDSA1R] = 0x618,
  	[LDMLSR] = 0x620,
  	[LDHCNR] = 0x624,
  	[LDHSYNR] = 0x628,
  	[LDVLNR] = 0x62c,
  	[LDVSYNR] = 0x630,
  	[LDPMR] = 0x63c,
  };

  static const struct fb_videomode default_720p = {
  	.name = "HDMI 720p",
  	.xres = 1280,
  	.yres = 720,

  	.left_margin = 220,
  	.right_margin = 110,
  	.hsync_len = 40,

  
  	.upper_margin = 20,
  	.lower_margin = 5,
  	.vsync_len = 5,
  
  	.pixclock = 13468,

  	.refresh = 60,

  	.sync = FB_SYNC_VERT_HIGH_ACT | FB_SYNC_HOR_HIGH_ACT,

  };
  
  struct sh_mobile_lcdc_priv {
  	void __iomem *base;
  	int irq;
  	atomic_t hw_usecnt;
  	struct device *dev;
  	struct clk *dot_clk;
  	unsigned long lddckr;
  	struct sh_mobile_lcdc_chan ch[2];

  	struct notifier_block notifier;

  	int started;

  	int forced_fourcc; /* 2 channel LCDC must share fourcc setting */

  	struct sh_mobile_meram_info *meram_dev;

  };

  static bool banked(int reg_nr)
  {
  	switch (reg_nr) {
  	case LDMT1R:
  	case LDMT2R:
  	case LDMT3R:
  	case LDDFR:
  	case LDSM1R:
  	case LDSA1R:

  	case LDSA2R:

  	case LDMLSR:
  	case LDHCNR:
  	case LDHSYNR:
  	case LDVLNR:
  	case LDVSYNR:
  		return true;
  	}
  	return false;
  }

  static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
  			    int reg_nr, unsigned long data)
  {
  	iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);

  	if (banked(reg_nr))
  		iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
  			  SIDE_B_OFFSET);
  }
  
  static void lcdc_write_chan_mirror(struct sh_mobile_lcdc_chan *chan,
  			    int reg_nr, unsigned long data)
  {
  	iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
  		  MIRROR_OFFSET);

  }
  
  static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
  				    int reg_nr)
  {
  	return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
  }
  
  static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
  		       unsigned long reg_offs, unsigned long data)
  {
  	iowrite32(data, priv->base + reg_offs);
  }
  
  static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
  			       unsigned long reg_offs)
  {
  	return ioread32(priv->base + reg_offs);
  }
  
  static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
  			  unsigned long reg_offs,
  			  unsigned long mask, unsigned long until)
  {
  	while ((lcdc_read(priv, reg_offs) & mask) != until)
  		cpu_relax();
  }
  
  static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
  {
  	return chan->cfg.chan == LCDC_CHAN_SUBLCD;
  }
  
  static void lcdc_sys_write_index(void *handle, unsigned long data)
  {
  	struct sh_mobile_lcdc_chan *ch = handle;

  	lcdc_write(ch->lcdc, _LDDWD0R, data | LDDWDxR_WDACT);
  	lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
  	lcdc_write(ch->lcdc, _LDDWAR, LDDWAR_WA |
  		   (lcdc_chan_is_sublcd(ch) ? 2 : 0));
  	lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);

  }
  
  static void lcdc_sys_write_data(void *handle, unsigned long data)
  {
  	struct sh_mobile_lcdc_chan *ch = handle;

  	lcdc_write(ch->lcdc, _LDDWD0R, data | LDDWDxR_WDACT | LDDWDxR_RSW);
  	lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
  	lcdc_write(ch->lcdc, _LDDWAR, LDDWAR_WA |
  		   (lcdc_chan_is_sublcd(ch) ? 2 : 0));
  	lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);

  }
  
  static unsigned long lcdc_sys_read_data(void *handle)
  {
  	struct sh_mobile_lcdc_chan *ch = handle;

  	lcdc_write(ch->lcdc, _LDDRDR, LDDRDR_RSR);
  	lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
  	lcdc_write(ch->lcdc, _LDDRAR, LDDRAR_RA |
  		   (lcdc_chan_is_sublcd(ch) ? 2 : 0));

  	udelay(1);

  	lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);

  	return lcdc_read(ch->lcdc, _LDDRDR) & LDDRDR_DRD_MASK;

  }
  
  struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
  	lcdc_sys_write_index,
  	lcdc_sys_write_data,
  	lcdc_sys_read_data,
  };

  static int sh_mobile_format_fourcc(const struct fb_var_screeninfo *var)
  {
  	if (var->grayscale > 1)
  		return var->grayscale;
  
  	switch (var->bits_per_pixel) {
  	case 16:
  		return V4L2_PIX_FMT_RGB565;
  	case 24:
  		return V4L2_PIX_FMT_BGR24;
  	case 32:
  		return V4L2_PIX_FMT_BGR32;
  	default:
  		return 0;
  	}
  }
  
  static int sh_mobile_format_is_fourcc(const struct fb_var_screeninfo *var)
  {
  	return var->grayscale > 1;
  }
  
  static bool sh_mobile_format_is_yuv(const struct fb_var_screeninfo *var)
  {
  	if (var->grayscale <= 1)
  		return false;
  
  	switch (var->grayscale) {
  	case V4L2_PIX_FMT_NV12:
  	case V4L2_PIX_FMT_NV21:
  	case V4L2_PIX_FMT_NV16:
  	case V4L2_PIX_FMT_NV61:
  	case V4L2_PIX_FMT_NV24:
  	case V4L2_PIX_FMT_NV42:
  		return true;
  
  	default:
  		return false;
  	}
  }

  static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
  {

  	if (atomic_inc_and_test(&priv->hw_usecnt)) {

  		if (priv->dot_clk)
  			clk_enable(priv->dot_clk);

  		pm_runtime_get_sync(priv->dev);

  		if (priv->meram_dev && priv->meram_dev->pdev)
  			pm_runtime_get_sync(&priv->meram_dev->pdev->dev);

  	}
  }
  
  static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
  {

  	if (atomic_sub_return(1, &priv->hw_usecnt) == -1) {

  		if (priv->meram_dev && priv->meram_dev->pdev)
  			pm_runtime_put_sync(&priv->meram_dev->pdev->dev);

  		pm_runtime_put(priv->dev);

  		if (priv->dot_clk)
  			clk_disable(priv->dot_clk);

  	}
  }

  static int sh_mobile_lcdc_sginit(struct fb_info *info,
  				  struct list_head *pagelist)
  {
  	struct sh_mobile_lcdc_chan *ch = info->par;
  	unsigned int nr_pages_max = info->fix.smem_len >> PAGE_SHIFT;
  	struct page *page;
  	int nr_pages = 0;
  
  	sg_init_table(ch->sglist, nr_pages_max);
  
  	list_for_each_entry(page, pagelist, lru)
  		sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);
  
  	return nr_pages;
  }

  static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
  				       struct list_head *pagelist)
  {
  	struct sh_mobile_lcdc_chan *ch = info->par;

  	struct sh_mobile_lcdc_board_cfg	*bcfg = &ch->cfg.board_cfg;

  
  	/* enable clocks before accessing hardware */
  	sh_mobile_lcdc_clk_on(ch->lcdc);

  	/*
  	 * It's possible to get here without anything on the pagelist via
  	 * sh_mobile_lcdc_deferred_io_touch() or via a userspace fsync()
  	 * invocation. In the former case, the acceleration routines are
  	 * stepped in to when using the framebuffer console causing the
  	 * workqueue to be scheduled without any dirty pages on the list.
  	 *
  	 * Despite this, a panel update is still needed given that the
  	 * acceleration routines have their own methods for writing in
  	 * that still need to be updated.
  	 *
  	 * The fsync() and empty pagelist case could be optimized for,
  	 * but we don't bother, as any application exhibiting such
  	 * behaviour is fundamentally broken anyways.
  	 */
  	if (!list_empty(pagelist)) {
  		unsigned int nr_pages = sh_mobile_lcdc_sginit(info, pagelist);
  
  		/* trigger panel update */
  		dma_map_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);

  		if (bcfg->start_transfer)
  			bcfg->start_transfer(bcfg->board_data, ch,
  					     &sh_mobile_lcdc_sys_bus_ops);

  		lcdc_write_chan(ch, LDSM2R, LDSM2R_OSTRG);

  		dma_unmap_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);

  	} else {
  		if (bcfg->start_transfer)
  			bcfg->start_transfer(bcfg->board_data, ch,
  					     &sh_mobile_lcdc_sys_bus_ops);

  		lcdc_write_chan(ch, LDSM2R, LDSM2R_OSTRG);

  	}

  }
  
  static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
  {
  	struct fb_deferred_io *fbdefio = info->fbdefio;
  
  	if (fbdefio)
  		schedule_delayed_work(&info->deferred_work, fbdefio->delay);
  }
  
  static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
  {
  	struct sh_mobile_lcdc_priv *priv = data;

  	struct sh_mobile_lcdc_chan *ch;

  	unsigned long ldintr;

  	int is_sub;
  	int k;

  	/* Acknowledge interrupts and disable further VSYNC End IRQs. */
  	ldintr = lcdc_read(priv, _LDINTR);
  	lcdc_write(priv, _LDINTR, (ldintr ^ LDINTR_STATUS_MASK) & ~LDINTR_VEE);

  	/* figure out if this interrupt is for main or sub lcd */

  	is_sub = (lcdc_read(priv, _LDSR) & LDSR_MSS) ? 1 : 0;

  	/* wake up channel and disable clocks */

  	for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
  		ch = &priv->ch[k];
  
  		if (!ch->enabled)
  			continue;

  		/* Frame End */

  		if (ldintr & LDINTR_FS) {
  			if (is_sub == lcdc_chan_is_sublcd(ch)) {
  				ch->frame_end = 1;
  				wake_up(&ch->frame_end_wait);

  				sh_mobile_lcdc_clk_off(priv);
  			}
  		}
  
  		/* VSYNC End */

  		if (ldintr & LDINTR_VES)
  			complete(&ch->vsync_completion);

  	}

  	return IRQ_HANDLED;
  }

  static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
  				      int start)
  {
  	unsigned long tmp = lcdc_read(priv, _LDCNT2R);
  	int k;
  
  	/* start or stop the lcdc */
  	if (start)

  		lcdc_write(priv, _LDCNT2R, tmp | LDCNT2R_DO);

  	else

  		lcdc_write(priv, _LDCNT2R, tmp & ~LDCNT2R_DO);

  
  	/* wait until power is applied/stopped on all channels */
  	for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
  		if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
  			while (1) {

  				tmp = lcdc_read_chan(&priv->ch[k], LDPMR)
  				    & LDPMR_LPS;
  				if (start && tmp == LDPMR_LPS)

  					break;
  				if (!start && tmp == 0)
  					break;
  				cpu_relax();
  			}
  
  	if (!start)
  		lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
  }

  static void sh_mobile_lcdc_geometry(struct sh_mobile_lcdc_chan *ch)
  {

  	struct fb_var_screeninfo *var = &ch->info->var, *display_var = &ch->display_var;
  	unsigned long h_total, hsync_pos, display_h_total;

  	u32 tmp;
  
  	tmp = ch->ldmt1r_value;

  	tmp |= (var->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : LDMT1R_VPOL;
  	tmp |= (var->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : LDMT1R_HPOL;
  	tmp |= (ch->cfg.flags & LCDC_FLAGS_DWPOL) ? LDMT1R_DWPOL : 0;
  	tmp |= (ch->cfg.flags & LCDC_FLAGS_DIPOL) ? LDMT1R_DIPOL : 0;
  	tmp |= (ch->cfg.flags & LCDC_FLAGS_DAPOL) ? LDMT1R_DAPOL : 0;
  	tmp |= (ch->cfg.flags & LCDC_FLAGS_HSCNT) ? LDMT1R_HSCNT : 0;
  	tmp |= (ch->cfg.flags & LCDC_FLAGS_DWCNT) ? LDMT1R_DWCNT : 0;

  	lcdc_write_chan(ch, LDMT1R, tmp);
  
  	/* setup SYS bus */
  	lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r);
  	lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r);
  
  	/* horizontal configuration */

  	h_total = display_var->xres + display_var->hsync_len +
  		display_var->left_margin + display_var->right_margin;

  	tmp = h_total / 8; /* HTCN */

  	tmp |= (min(display_var->xres, var->xres) / 8) << 16; /* HDCN */

  	lcdc_write_chan(ch, LDHCNR, tmp);

  	hsync_pos = display_var->xres + display_var->right_margin;

  	tmp = hsync_pos / 8; /* HSYNP */

  	tmp |= (display_var->hsync_len / 8) << 16; /* HSYNW */

  	lcdc_write_chan(ch, LDHSYNR, tmp);
  
  	/* vertical configuration */

  	tmp = display_var->yres + display_var->vsync_len +
  		display_var->upper_margin + display_var->lower_margin; /* VTLN */
  	tmp |= min(display_var->yres, var->yres) << 16; /* VDLN */

  	lcdc_write_chan(ch, LDVLNR, tmp);

  	tmp = display_var->yres + display_var->lower_margin; /* VSYNP */
  	tmp |= display_var->vsync_len << 16; /* VSYNW */

  	lcdc_write_chan(ch, LDVSYNR, tmp);
  
  	/* Adjust horizontal synchronisation for HDMI */

  	display_h_total = display_var->xres + display_var->hsync_len +
  		display_var->left_margin + display_var->right_margin;
  	tmp = ((display_var->xres & 7) << 24) |
  		((display_h_total & 7) << 16) |
  		((display_var->hsync_len & 7) << 8) |

  		(hsync_pos & 7);

  	lcdc_write_chan(ch, LDHAJR, tmp);
  }

  /*
   * __sh_mobile_lcdc_start - Configure and tart the LCDC
   * @priv: LCDC device
   *
   * Configure all enabled channels and start the LCDC device. All external
   * devices (clocks, MERAM, panels, ...) are not touched by this function.
   */
  static void __sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)

  {
  	struct sh_mobile_lcdc_chan *ch;

  	unsigned long tmp;

  	int k, m;

  	/* Enable LCDC channels. Read data from external memory, avoid using the
  	 * BEU for now.
  	 */
  	lcdc_write(priv, _LDCNT2R, priv->ch[0].enabled | priv->ch[1].enabled);

  	/* Stop the LCDC first and disable all interrupts. */

  	sh_mobile_lcdc_start_stop(priv, 0);

  	lcdc_write(priv, _LDINTR, 0);

  	/* Configure power supply, dot clocks and start them. */

  	tmp = priv->lddckr;
  	for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
  		ch = &priv->ch[k];

  		if (!ch->enabled)

  			continue;

  		/* Power supply */
  		lcdc_write_chan(ch, LDPMR, 0);

  		m = ch->cfg.clock_divider;
  		if (!m)
  			continue;

  		/* FIXME: sh7724 can only use 42, 48, 54 and 60 for the divider
  		 * denominator.
  		 */
  		lcdc_write_chan(ch, LDDCKPAT1R, 0);
  		lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);

  		if (m == 1)

  			m = LDDCKR_MOSEL;

  		tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);

  	}
  
  	lcdc_write(priv, _LDDCKR, tmp);

  	lcdc_write(priv, _LDDCKSTPR, 0);
  	lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);

  	/* Setup geometry, format, frame buffer memory and operation mode. */

  	for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
  		ch = &priv->ch[k];

  		if (!ch->enabled)
  			continue;

  		sh_mobile_lcdc_geometry(ch);

  		switch (sh_mobile_format_fourcc(&ch->info->var)) {
  		case V4L2_PIX_FMT_RGB565:
  			tmp = LDDFR_PKF_RGB16;
  			break;
  		case V4L2_PIX_FMT_BGR24:
  			tmp = LDDFR_PKF_RGB24;
  			break;
  		case V4L2_PIX_FMT_BGR32:
  			tmp = LDDFR_PKF_ARGB32;
  			break;
  		case V4L2_PIX_FMT_NV12:
  		case V4L2_PIX_FMT_NV21:
  			tmp = LDDFR_CC | LDDFR_YF_420;
  			break;
  		case V4L2_PIX_FMT_NV16:
  		case V4L2_PIX_FMT_NV61:
  			tmp = LDDFR_CC | LDDFR_YF_422;
  			break;
  		case V4L2_PIX_FMT_NV24:
  		case V4L2_PIX_FMT_NV42:
  			tmp = LDDFR_CC | LDDFR_YF_444;
  			break;
  		}
  
  		if (sh_mobile_format_is_yuv(&ch->info->var)) {
  			switch (ch->info->var.colorspace) {
  			case V4L2_COLORSPACE_REC709:
  				tmp |= LDDFR_CF1;

  				break;

  			case V4L2_COLORSPACE_JPEG:
  				tmp |= LDDFR_CF0;

  				break;
  			}

  		}

  		lcdc_write_chan(ch, LDDFR, tmp);
  		lcdc_write_chan(ch, LDMLSR, ch->pitch);
  		lcdc_write_chan(ch, LDSA1R, ch->base_addr_y);

  		if (sh_mobile_format_is_yuv(&ch->info->var))

  			lcdc_write_chan(ch, LDSA2R, ch->base_addr_c);

  		/* When using deferred I/O mode, configure the LCDC for one-shot
  		 * operation and enable the frame end interrupt. Otherwise use
  		 * continuous read mode.
  		 */
  		if (ch->ldmt1r_value & LDMT1R_IFM &&
  		    ch->cfg.sys_bus_cfg.deferred_io_msec) {
  			lcdc_write_chan(ch, LDSM1R, LDSM1R_OS);
  			lcdc_write(priv, _LDINTR, LDINTR_FE);
  		} else {
  			lcdc_write_chan(ch, LDSM1R, 0);
  		}
  	}

  	/* Word and long word swap. */

  	switch (sh_mobile_format_fourcc(&priv->ch[0].info->var)) {
  	case V4L2_PIX_FMT_RGB565:
  	case V4L2_PIX_FMT_NV21:
  	case V4L2_PIX_FMT_NV61:
  	case V4L2_PIX_FMT_NV42:
  		tmp = LDDDSR_LS | LDDDSR_WS;
  		break;
  	case V4L2_PIX_FMT_BGR24:
  	case V4L2_PIX_FMT_NV12:
  	case V4L2_PIX_FMT_NV16:
  	case V4L2_PIX_FMT_NV24:

  		tmp = LDDDSR_LS | LDDDSR_WS | LDDDSR_BS;

  		break;
  	case V4L2_PIX_FMT_BGR32:
  	default:
  		tmp = LDDDSR_LS;
  		break;

  	}
  	lcdc_write(priv, _LDDDSR, tmp);

  	/* Enable the display output. */
  	lcdc_write(priv, _LDCNT1R, LDCNT1R_DE);
  	sh_mobile_lcdc_start_stop(priv, 1);
  	priv->started = 1;
  }

  static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
  {
  	struct sh_mobile_meram_info *mdev = priv->meram_dev;
  	struct sh_mobile_lcdc_board_cfg	*board_cfg;
  	struct sh_mobile_lcdc_chan *ch;
  	unsigned long tmp;
  	int ret;
  	int k;

  	/* enable clocks before accessing the hardware */
  	for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
  		if (priv->ch[k].enabled)
  			sh_mobile_lcdc_clk_on(priv);
  	}

  	/* reset */
  	lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LDCNT2R_BR);
  	lcdc_wait_bit(priv, _LDCNT2R, LDCNT2R_BR, 0);

  	for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
  		ch = &priv->ch[k];

  		if (!ch->enabled)
  			continue;
  
  		board_cfg = &ch->cfg.board_cfg;
  		if (board_cfg->setup_sys) {
  			ret = board_cfg->setup_sys(board_cfg->board_data, ch,
  						   &sh_mobile_lcdc_sys_bus_ops);
  			if (ret)
  				return ret;

  		}

  	}

  	/* Compute frame buffer base address and pitch for each channel. */
  	for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
  		struct sh_mobile_meram_cfg *cfg;
  		int pixelformat;

  		ch = &priv->ch[k];
  		if (!ch->enabled)
  			continue;

  		ch->base_addr_y = ch->info->fix.smem_start;
  		ch->base_addr_c = ch->base_addr_y
  				+ ch->info->var.xres
  				* ch->info->var.yres_virtual;
  		ch->pitch = ch->info->fix.line_length;
  
  		/* Enable MERAM if possible. */
  		cfg = ch->cfg.meram_cfg;
  		if (mdev == NULL || mdev->ops == NULL || cfg == NULL)
  			continue;
  
  		/* we need to de-init configured ICBs before we can
  		 * re-initialize them.
  		 */
  		if (ch->meram_enabled) {
  			mdev->ops->meram_unregister(mdev, cfg);
  			ch->meram_enabled = 0;
  		}

  		switch (sh_mobile_format_fourcc(&ch->info->var)) {
  		case V4L2_PIX_FMT_NV12:
  		case V4L2_PIX_FMT_NV21:
  		case V4L2_PIX_FMT_NV16:
  		case V4L2_PIX_FMT_NV61:

  			pixelformat = SH_MOBILE_MERAM_PF_NV;

  			break;
  		case V4L2_PIX_FMT_NV24:
  		case V4L2_PIX_FMT_NV42:
  			pixelformat = SH_MOBILE_MERAM_PF_NV24;
  			break;
  		case V4L2_PIX_FMT_RGB565:
  		case V4L2_PIX_FMT_BGR24:
  		case V4L2_PIX_FMT_BGR32:
  		default:
  			pixelformat = SH_MOBILE_MERAM_PF_RGB;
  			break;
  		}

  
  		ret = mdev->ops->meram_register(mdev, cfg, ch->pitch,
  					ch->info->var.yres, pixelformat,
  					ch->base_addr_y, ch->base_addr_c,
  					&ch->base_addr_y, &ch->base_addr_c,
  					&ch->pitch);
  		if (!ret)
  			ch->meram_enabled = 1;
  	}
  
  	/* Start the LCDC. */
  	__sh_mobile_lcdc_start(priv);
  
  	/* Setup deferred I/O, tell the board code to enable the panels, and
  	 * turn backlight on.
  	 */

  	for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
  		ch = &priv->ch[k];

  		if (!ch->enabled)
  			continue;

  		tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
  		if (ch->ldmt1r_value & LDMT1R_IFM && tmp) {
  			ch->defio.deferred_io = sh_mobile_lcdc_deferred_io;
  			ch->defio.delay = msecs_to_jiffies(tmp);
  			ch->info->fbdefio = &ch->defio;
  			fb_deferred_io_init(ch->info);
  		}

  		board_cfg = &ch->cfg.board_cfg;

  		if (board_cfg->display_on && try_module_get(board_cfg->owner)) {

  			board_cfg->display_on(board_cfg->board_data, ch->info);

  			module_put(board_cfg->owner);
  		}

  
  		if (ch->bl) {
  			ch->bl->props.power = FB_BLANK_UNBLANK;
  			backlight_update_status(ch->bl);
  		}

  	}
  
  	return 0;
  }
  
  static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
  {
  	struct sh_mobile_lcdc_chan *ch;
  	struct sh_mobile_lcdc_board_cfg	*board_cfg;
  	int k;

  	/* clean up deferred io and ask board code to disable panel */

  	for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
  		ch = &priv->ch[k];

  		if (!ch->enabled)
  			continue;

  		/* deferred io mode:
  		 * flush frame, and wait for frame end interrupt
  		 * clean up deferred io and enable clock
  		 */

  		if (ch->info && ch->info->fbdefio) {

  			ch->frame_end = 0;

  			schedule_delayed_work(&ch->info->deferred_work, 0);

  			wait_event(ch->frame_end_wait, ch->frame_end);

  			fb_deferred_io_cleanup(ch->info);
  			ch->info->fbdefio = NULL;

  			sh_mobile_lcdc_clk_on(priv);

  		}

  		if (ch->bl) {
  			ch->bl->props.power = FB_BLANK_POWERDOWN;
  			backlight_update_status(ch->bl);
  		}

  		board_cfg = &ch->cfg.board_cfg;

  		if (board_cfg->display_off && try_module_get(board_cfg->owner)) {

  			board_cfg->display_off(board_cfg->board_data);

  			module_put(board_cfg->owner);
  		}

  
  		/* disable the meram */
  		if (ch->meram_enabled) {
  			struct sh_mobile_meram_cfg *cfg;
  			struct sh_mobile_meram_info *mdev;
  			cfg = ch->cfg.meram_cfg;
  			mdev = priv->meram_dev;
  			mdev->ops->meram_unregister(mdev, cfg);
  			ch->meram_enabled = 0;
  		}

  	}
  
  	/* stop the lcdc */

  	if (priv->started) {
  		sh_mobile_lcdc_start_stop(priv, 0);
  		priv->started = 0;
  	}

  	/* stop clocks */
  	for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
  		if (priv->ch[k].enabled)
  			sh_mobile_lcdc_clk_off(priv);

  }
  
  static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
  {

  	int interface_type = ch->cfg.interface_type;
  
  	switch (interface_type) {
  	case RGB8:
  	case RGB9:
  	case RGB12A:
  	case RGB12B:
  	case RGB16:
  	case RGB18:
  	case RGB24:
  	case SYS8A:
  	case SYS8B:
  	case SYS8C:
  	case SYS8D:
  	case SYS9:
  	case SYS12:
  	case SYS16A:
  	case SYS16B:
  	case SYS16C:
  	case SYS18:
  	case SYS24:
  		break;
  	default:
  		return -EINVAL;

  	}
  
  	/* SUBLCD only supports SYS interface */
  	if (lcdc_chan_is_sublcd(ch)) {

  		if (!(interface_type & LDMT1R_IFM))
  			return -EINVAL;
  
  		interface_type &= ~LDMT1R_IFM;

  	}

  	ch->ldmt1r_value = interface_type;

  	return 0;

  }

  static int sh_mobile_lcdc_setup_clocks(struct platform_device *pdev,
  				       int clock_source,

  				       struct sh_mobile_lcdc_priv *priv)
  {
  	char *str;

  
  	switch (clock_source) {

  	case LCDC_CLK_BUS:
  		str = "bus_clk";
  		priv->lddckr = LDDCKR_ICKSEL_BUS;
  		break;
  	case LCDC_CLK_PERIPHERAL:
  		str = "peripheral_clk";
  		priv->lddckr = LDDCKR_ICKSEL_MIPI;
  		break;
  	case LCDC_CLK_EXTERNAL:
  		str = NULL;
  		priv->lddckr = LDDCKR_ICKSEL_HDMI;
  		break;

  	default:
  		return -EINVAL;
  	}

  	if (str) {

  		priv->dot_clk = clk_get(&pdev->dev, str);
  		if (IS_ERR(priv->dot_clk)) {
  			dev_err(&pdev->dev, "cannot get dot clock %s
  ", str);

  			return PTR_ERR(priv->dot_clk);

  		}

  	}

  
  	/* Runtime PM support involves two step for this driver:
  	 * 1) Enable Runtime PM
  	 * 2) Force Runtime PM Resume since hardware is accessed from probe()
  	 */

  	priv->dev = &pdev->dev;

  	pm_runtime_enable(priv->dev);
  	pm_runtime_resume(priv->dev);

  	return 0;
  }
  
  static int sh_mobile_lcdc_setcolreg(u_int regno,
  				    u_int red, u_int green, u_int blue,
  				    u_int transp, struct fb_info *info)
  {
  	u32 *palette = info->pseudo_palette;
  
  	if (regno >= PALETTE_NR)
  		return -EINVAL;
  
  	/* only FB_VISUAL_TRUECOLOR supported */
  
  	red >>= 16 - info->var.red.length;
  	green >>= 16 - info->var.green.length;
  	blue >>= 16 - info->var.blue.length;
  	transp >>= 16 - info->var.transp.length;
  
  	palette[regno] = (red << info->var.red.offset) |
  	  (green << info->var.green.offset) |
  	  (blue << info->var.blue.offset) |
  	  (transp << info->var.transp.offset);
  
  	return 0;
  }
  
  static struct fb_fix_screeninfo sh_mobile_lcdc_fix  = {
  	.id =		"SH Mobile LCDC",
  	.type =		FB_TYPE_PACKED_PIXELS,
  	.visual =	FB_VISUAL_TRUECOLOR,
  	.accel =	FB_ACCEL_NONE,

  	.xpanstep =	0,
  	.ypanstep =	1,
  	.ywrapstep =	0,

  	.capabilities =	FB_CAP_FOURCC,

  };

  static void sh_mobile_lcdc_fillrect(struct fb_info *info,
  				    const struct fb_fillrect *rect)
  {
  	sys_fillrect(info, rect);
  	sh_mobile_lcdc_deferred_io_touch(info);
  }
  
  static void sh_mobile_lcdc_copyarea(struct fb_info *info,
  				    const struct fb_copyarea *area)
  {
  	sys_copyarea(info, area);
  	sh_mobile_lcdc_deferred_io_touch(info);
  }
  
  static void sh_mobile_lcdc_imageblit(struct fb_info *info,
  				     const struct fb_image *image)
  {
  	sys_imageblit(info, image);
  	sh_mobile_lcdc_deferred_io_touch(info);
  }

  static int sh_mobile_fb_pan_display(struct fb_var_screeninfo *var,
  				     struct fb_info *info)
  {
  	struct sh_mobile_lcdc_chan *ch = info->par;

  	struct sh_mobile_lcdc_priv *priv = ch->lcdc;
  	unsigned long ldrcntr;
  	unsigned long new_pan_offset;

  	unsigned long base_addr_y, base_addr_c;
  	unsigned long c_offset;

  	bool yuv = sh_mobile_format_is_yuv(&info->var);

  	if (!yuv)

  		new_pan_offset = var->yoffset * info->fix.line_length
  			       + var->xoffset * (info->var.bits_per_pixel / 8);

  	else

  		new_pan_offset = var->yoffset * info->fix.line_length
  			       + var->xoffset;

  	if (new_pan_offset == ch->pan_offset)

  		return 0;	/* No change, do nothing */

  	ldrcntr = lcdc_read(priv, _LDRCNTR);

  	/* Set the source address for the next refresh */

  	base_addr_y = ch->dma_handle + new_pan_offset;

  	if (yuv) {

  		/* Set y offset */

  		c_offset = var->yoffset * info->fix.line_length
  			 * (info->var.bits_per_pixel - 8) / 8;
  		base_addr_c = ch->dma_handle
  			    + info->var.xres * info->var.yres_virtual
  			    + c_offset;

  		/* Set x offset */

  		if (sh_mobile_format_fourcc(&info->var) == V4L2_PIX_FMT_NV24)

  			base_addr_c += 2 * var->xoffset;
  		else
  			base_addr_c += var->xoffset;

  	}

  	if (ch->meram_enabled) {

  		struct sh_mobile_meram_cfg *cfg;
  		struct sh_mobile_meram_info *mdev;

  		int ret;
  
  		cfg = ch->cfg.meram_cfg;
  		mdev = priv->meram_dev;
  		ret = mdev->ops->meram_update(mdev, cfg,
  					base_addr_y, base_addr_c,

  					&base_addr_y, &base_addr_c);

  		if (ret)
  			return ret;

  	}

  	ch->base_addr_y = base_addr_y;
  	ch->base_addr_c = base_addr_c;

  	lcdc_write_chan_mirror(ch, LDSA1R, base_addr_y);

  	if (yuv)

  		lcdc_write_chan_mirror(ch, LDSA2R, base_addr_c);

  	if (lcdc_chan_is_sublcd(ch))
  		lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_SRS);
  	else
  		lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_MRS);
  
  	ch->pan_offset = new_pan_offset;
  
  	sh_mobile_lcdc_deferred_io_touch(info);

  
  	return 0;
  }

  static int sh_mobile_wait_for_vsync(struct fb_info *info)
  {
  	struct sh_mobile_lcdc_chan *ch = info->par;
  	unsigned long ldintr;
  	int ret;

  	/* Enable VSync End interrupt and be careful not to acknowledge any
  	 * pending interrupt.
  	 */

  	ldintr = lcdc_read(ch->lcdc, _LDINTR);

  	ldintr |= LDINTR_VEE | LDINTR_STATUS_MASK;

  	lcdc_write(ch->lcdc, _LDINTR, ldintr);
  
  	ret = wait_for_completion_interruptible_timeout(&ch->vsync_completion,
  							msecs_to_jiffies(100));
  	if (!ret)
  		return -ETIMEDOUT;
  
  	return 0;
  }
  
  static int sh_mobile_ioctl(struct fb_info *info, unsigned int cmd,
  		       unsigned long arg)
  {
  	int retval;
  
  	switch (cmd) {
  	case FBIO_WAITFORVSYNC:
  		retval = sh_mobile_wait_for_vsync(info);
  		break;
  
  	default:
  		retval = -ENOIOCTLCMD;
  		break;
  	}
  	return retval;
  }

  static void sh_mobile_fb_reconfig(struct fb_info *info)
  {
  	struct sh_mobile_lcdc_chan *ch = info->par;
  	struct fb_videomode mode1, mode2;
  	struct fb_event event;
  	int evnt = FB_EVENT_MODE_CHANGE_ALL;
  
  	if (ch->use_count > 1 || (ch->use_count == 1 && !info->fbcon_par))
  		/* More framebuffer users are active */
  		return;
  
  	fb_var_to_videomode(&mode1, &ch->display_var);
  	fb_var_to_videomode(&mode2, &info->var);
  
  	if (fb_mode_is_equal(&mode1, &mode2))
  		return;
  
  	/* Display has been re-plugged, framebuffer is free now, reconfigure */
  	if (fb_set_var(info, &ch->display_var) < 0)
  		/* Couldn't reconfigure, hopefully, can continue as before */
  		return;

  	/*
  	 * fb_set_var() calls the notifier change internally, only if
  	 * FBINFO_MISC_USEREVENT flag is set. Since we do not want to fake a
  	 * user event, we have to call the chain ourselves.
  	 */
  	event.info = info;

  	event.data = &mode1;

  	fb_notifier_call_chain(evnt, &event);
  }
  
  /*
   * Locking: both .fb_release() and .fb_open() are called with info->lock held if
   * user == 1, or with console sem held, if user == 0.
   */
  static int sh_mobile_release(struct fb_info *info, int user)
  {
  	struct sh_mobile_lcdc_chan *ch = info->par;
  
  	mutex_lock(&ch->open_lock);
  	dev_dbg(info->dev, "%s(): %d users
  ", __func__, ch->use_count);
  
  	ch->use_count--;
  
  	/* Nothing to reconfigure, when called from fbcon */
  	if (user) {

  		console_lock();

  		sh_mobile_fb_reconfig(info);

  		console_unlock();

  	}
  
  	mutex_unlock(&ch->open_lock);
  
  	return 0;
  }
  
  static int sh_mobile_open(struct fb_info *info, int user)
  {
  	struct sh_mobile_lcdc_chan *ch = info->par;
  
  	mutex_lock(&ch->open_lock);
  	ch->use_count++;
  
  	dev_dbg(info->dev, "%s(): %d users
  ", __func__, ch->use_count);
  	mutex_unlock(&ch->open_lock);
  
  	return 0;
  }
  
  static int sh_mobile_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
  {
  	struct sh_mobile_lcdc_chan *ch = info->par;

  	struct sh_mobile_lcdc_priv *p = ch->lcdc;

  	unsigned int best_dist = (unsigned int)-1;
  	unsigned int best_xres = 0;
  	unsigned int best_yres = 0;
  	unsigned int i;

  	if (var->xres > MAX_XRES || var->yres > MAX_YRES)

  		return -EINVAL;

  
  	/* If board code provides us with a list of available modes, make sure
  	 * we use one of them. Find the mode closest to the requested one. The
  	 * distance between two modes is defined as the size of the
  	 * non-overlapping parts of the two rectangles.
  	 */
  	for (i = 0; i < ch->cfg.num_cfg; ++i) {
  		const struct fb_videomode *mode = &ch->cfg.lcd_cfg[i];
  		unsigned int dist;
  
  		/* We can only round up. */
  		if (var->xres > mode->xres || var->yres > mode->yres)
  			continue;
  
  		dist = var->xres * var->yres + mode->xres * mode->yres
  		     - 2 * min(var->xres, mode->xres)
  			 * min(var->yres, mode->yres);
  
  		if (dist < best_dist) {
  			best_xres = mode->xres;
  			best_yres = mode->yres;
  			best_dist = dist;
  		}

  	}

  	/* If no available mode can be used, return an error. */
  	if (ch->cfg.num_cfg != 0) {
  		if (best_dist == (unsigned int)-1)
  			return -EINVAL;
  
  		var->xres = best_xres;
  		var->yres = best_yres;
  	}
  
  	/* Make sure the virtual resolution is at least as big as the visible
  	 * resolution.
  	 */
  	if (var->xres_virtual < var->xres)
  		var->xres_virtual = var->xres;
  	if (var->yres_virtual < var->yres)
  		var->yres_virtual = var->yres;

  	if (sh_mobile_format_is_fourcc(var)) {
  		switch (var->grayscale) {
  		case V4L2_PIX_FMT_NV12:
  		case V4L2_PIX_FMT_NV21:
  			var->bits_per_pixel = 12;
  			break;
  		case V4L2_PIX_FMT_RGB565:
  		case V4L2_PIX_FMT_NV16:
  		case V4L2_PIX_FMT_NV61:
  			var->bits_per_pixel = 16;
  			break;
  		case V4L2_PIX_FMT_BGR24:
  		case V4L2_PIX_FMT_NV24:
  		case V4L2_PIX_FMT_NV42:
  			var->bits_per_pixel = 24;
  			break;
  		case V4L2_PIX_FMT_BGR32:
  			var->bits_per_pixel = 32;
  			break;
  		default:
  			return -EINVAL;
  		}
  
  		/* Default to RGB and JPEG color-spaces for RGB and YUV formats
  		 * respectively.
  		 */
  		if (!sh_mobile_format_is_yuv(var))
  			var->colorspace = V4L2_COLORSPACE_SRGB;
  		else if (var->colorspace != V4L2_COLORSPACE_REC709)
  			var->colorspace = V4L2_COLORSPACE_JPEG;
  	} else {
  		if (var->bits_per_pixel <= 16) {		/* RGB 565 */
  			var->bits_per_pixel = 16;
  			var->red.offset = 11;
  			var->red.length = 5;
  			var->green.offset = 5;
  			var->green.length = 6;
  			var->blue.offset = 0;
  			var->blue.length = 5;
  			var->transp.offset = 0;
  			var->transp.length = 0;
  		} else if (var->bits_per_pixel <= 24) {		/* RGB 888 */
  			var->bits_per_pixel = 24;
  			var->red.offset = 16;
  			var->red.length = 8;
  			var->green.offset = 8;
  			var->green.length = 8;
  			var->blue.offset = 0;
  			var->blue.length = 8;
  			var->transp.offset = 0;
  			var->transp.length = 0;
  		} else if (var->bits_per_pixel <= 32) {		/* RGBA 888 */
  			var->bits_per_pixel = 32;
  			var->red.offset = 16;
  			var->red.length = 8;
  			var->green.offset = 8;
  			var->green.length = 8;
  			var->blue.offset = 0;
  			var->blue.length = 8;
  			var->transp.offset = 24;
  			var->transp.length = 8;
  		} else
  			return -EINVAL;

  		var->red.msb_right = 0;
  		var->green.msb_right = 0;
  		var->blue.msb_right = 0;
  		var->transp.msb_right = 0;
  	}

  
  	/* Make sure we don't exceed our allocated memory. */
  	if (var->xres_virtual * var->yres_virtual * var->bits_per_pixel / 8 >
  	    info->fix.smem_len)
  		return -EINVAL;

  	/* only accept the forced_fourcc for dual channel configurations */
  	if (p->forced_fourcc &&
  	    p->forced_fourcc != sh_mobile_format_fourcc(var))

  		return -EINVAL;

  	return 0;
  }

  static int sh_mobile_set_par(struct fb_info *info)
  {
  	struct sh_mobile_lcdc_chan *ch = info->par;

  	u32 line_length = info->fix.line_length;

  	int ret;
  
  	sh_mobile_lcdc_stop(ch->lcdc);

  	if (sh_mobile_format_is_yuv(&info->var))

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

  	ret = sh_mobile_lcdc_start(ch->lcdc);

  	if (ret < 0) {

  		dev_err(info->dev, "%s: unable to restart LCDC
  ", __func__);

  		info->fix.line_length = line_length;
  	}

  	if (sh_mobile_format_is_fourcc(&info->var)) {
  		info->fix.type = FB_TYPE_FOURCC;
  		info->fix.visual = FB_VISUAL_FOURCC;
  	} else {
  		info->fix.type = FB_TYPE_PACKED_PIXELS;
  		info->fix.visual = FB_VISUAL_TRUECOLOR;
  	}

  	return ret;
  }

  /*
   * Screen blanking. Behavior is as follows:
   * FB_BLANK_UNBLANK: screen unblanked, clocks enabled
   * FB_BLANK_NORMAL: screen blanked, clocks enabled
   * FB_BLANK_VSYNC,
   * FB_BLANK_HSYNC,
   * FB_BLANK_POWEROFF: screen blanked, clocks disabled
   */
  static int sh_mobile_lcdc_blank(int blank, struct fb_info *info)
  {
  	struct sh_mobile_lcdc_chan *ch = info->par;
  	struct sh_mobile_lcdc_priv *p = ch->lcdc;
  
  	/* blank the screen? */
  	if (blank > FB_BLANK_UNBLANK && ch->blank_status == FB_BLANK_UNBLANK) {
  		struct fb_fillrect rect = {
  			.width = info->var.xres,
  			.height = info->var.yres,
  		};
  		sh_mobile_lcdc_fillrect(info, &rect);
  	}
  	/* turn clocks on? */
  	if (blank <= FB_BLANK_NORMAL && ch->blank_status > FB_BLANK_NORMAL) {
  		sh_mobile_lcdc_clk_on(p);
  	}
  	/* turn clocks off? */
  	if (blank > FB_BLANK_NORMAL && ch->blank_status <= FB_BLANK_NORMAL) {
  		/* make sure the screen is updated with the black fill before
  		 * switching the clocks off. one vsync is not enough since
  		 * blanking may occur in the middle of a refresh. deferred io
  		 * mode will reenable the clocks and update the screen in time,
  		 * so it does not need this. */
  		if (!info->fbdefio) {
  			sh_mobile_wait_for_vsync(info);
  			sh_mobile_wait_for_vsync(info);
  		}
  		sh_mobile_lcdc_clk_off(p);
  	}
  
  	ch->blank_status = blank;
  	return 0;
  }

  static struct fb_ops sh_mobile_lcdc_ops = {

  	.owner          = THIS_MODULE,

  	.fb_setcolreg	= sh_mobile_lcdc_setcolreg,

  	.fb_read        = fb_sys_read,
  	.fb_write       = fb_sys_write,

  	.fb_fillrect	= sh_mobile_lcdc_fillrect,
  	.fb_copyarea	= sh_mobile_lcdc_copyarea,
  	.fb_imageblit	= sh_mobile_lcdc_imageblit,

  	.fb_blank	= sh_mobile_lcdc_blank,

  	.fb_pan_display = sh_mobile_fb_pan_display,

  	.fb_ioctl       = sh_mobile_ioctl,

  	.fb_open	= sh_mobile_open,
  	.fb_release	= sh_mobile_release,
  	.fb_check_var	= sh_mobile_check_var,

  	.fb_set_par	= sh_mobile_set_par,

  };

  static int sh_mobile_lcdc_update_bl(struct backlight_device *bdev)
  {
  	struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);
  	struct sh_mobile_lcdc_board_cfg *cfg = &ch->cfg.board_cfg;
  	int brightness = bdev->props.brightness;
  
  	if (bdev->props.power != FB_BLANK_UNBLANK ||
  	    bdev->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
  		brightness = 0;
  
  	return cfg->set_brightness(cfg->board_data, brightness);
  }
  
  static int sh_mobile_lcdc_get_brightness(struct backlight_device *bdev)
  {
  	struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);
  	struct sh_mobile_lcdc_board_cfg *cfg = &ch->cfg.board_cfg;
  
  	return cfg->get_brightness(cfg->board_data);
  }
  
  static int sh_mobile_lcdc_check_fb(struct backlight_device *bdev,
  				   struct fb_info *info)
  {
  	return (info->bl_dev == bdev);
  }
  
  static struct backlight_ops sh_mobile_lcdc_bl_ops = {
  	.options	= BL_CORE_SUSPENDRESUME,
  	.update_status	= sh_mobile_lcdc_update_bl,
  	.get_brightness	= sh_mobile_lcdc_get_brightness,
  	.check_fb	= sh_mobile_lcdc_check_fb,
  };
  
  static struct backlight_device *sh_mobile_lcdc_bl_probe(struct device *parent,
  					       struct sh_mobile_lcdc_chan *ch)
  {
  	struct backlight_device *bl;
  
  	bl = backlight_device_register(ch->cfg.bl_info.name, parent, ch,
  				       &sh_mobile_lcdc_bl_ops, NULL);

  	if (IS_ERR(bl)) {
  		dev_err(parent, "unable to register backlight device: %ld
  ",
  			PTR_ERR(bl));

  		return NULL;
  	}
  
  	bl->props.max_brightness = ch->cfg.bl_info.max_brightness;
  	bl->props.brightness = bl->props.max_brightness;
  	backlight_update_status(bl);
  
  	return bl;
  }
  
  static void sh_mobile_lcdc_bl_remove(struct backlight_device *bdev)
  {
  	backlight_device_unregister(bdev);
  }

  static int sh_mobile_lcdc_suspend(struct device *dev)
  {
  	struct platform_device *pdev = to_platform_device(dev);
  
  	sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
  	return 0;
  }
  
  static int sh_mobile_lcdc_resume(struct device *dev)
  {
  	struct platform_device *pdev = to_platform_device(dev);
  
  	return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
  }

  static int sh_mobile_lcdc_runtime_suspend(struct device *dev)
  {
  	struct platform_device *pdev = to_platform_device(dev);

  	struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);

  
  	/* turn off LCDC hardware */

  	lcdc_write(priv, _LDCNT1R, 0);

  	return 0;
  }
  
  static int sh_mobile_lcdc_runtime_resume(struct device *dev)
  {
  	struct platform_device *pdev = to_platform_device(dev);

  	struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);

  	__sh_mobile_lcdc_start(priv);

  
  	return 0;
  }

  static const struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {

  	.suspend = sh_mobile_lcdc_suspend,
  	.resume = sh_mobile_lcdc_resume,

  	.runtime_suspend = sh_mobile_lcdc_runtime_suspend,
  	.runtime_resume = sh_mobile_lcdc_runtime_resume,

  };

  /* locking: called with info->lock held */

  static int sh_mobile_lcdc_notify(struct notifier_block *nb,
  				 unsigned long action, void *data)
  {
  	struct fb_event *event = data;
  	struct fb_info *info = event->info;
  	struct sh_mobile_lcdc_chan *ch = info->par;
  	struct sh_mobile_lcdc_board_cfg	*board_cfg = &ch->cfg.board_cfg;

  
  	if (&ch->lcdc->notifier != nb)

  		return NOTIFY_DONE;

  
  	dev_dbg(info->dev, "%s(): action = %lu, data = %p
  ",
  		__func__, action, event->data);
  
  	switch(action) {
  	case FB_EVENT_SUSPEND:

  		if (board_cfg->display_off && try_module_get(board_cfg->owner)) {

  			board_cfg->display_off(board_cfg->board_data);

  			module_put(board_cfg->owner);
  		}

  		sh_mobile_lcdc_stop(ch->lcdc);

  		break;
  	case FB_EVENT_RESUME:

  		mutex_lock(&ch->open_lock);
  		sh_mobile_fb_reconfig(info);
  		mutex_unlock(&ch->open_lock);

  
  		/* HDMI must be enabled before LCDC configuration */

  		if (board_cfg->display_on && try_module_get(board_cfg->owner)) {

  			board_cfg->display_on(board_cfg->board_data, info);

  			module_put(board_cfg->owner);

  		}

  		sh_mobile_lcdc_start(ch->lcdc);

  	}

  	return NOTIFY_OK;

  }

  static int sh_mobile_lcdc_remove(struct platform_device *pdev)
  {
  	struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
  	struct fb_info *info;
  	int i;
  
  	fb_unregister_client(&priv->notifier);
  
  	for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
  		if (priv->ch[i].info && priv->ch[i].info->dev)
  			unregister_framebuffer(priv->ch[i].info);
  
  	sh_mobile_lcdc_stop(priv);
  
  	for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
  		info = priv->ch[i].info;
  
  		if (!info || !info->device)
  			continue;
  
  		if (priv->ch[i].sglist)
  			vfree(priv->ch[i].sglist);
  
  		if (info->screen_base)
  			dma_free_coherent(&pdev->dev, info->fix.smem_len,
  					  info->screen_base,
  					  priv->ch[i].dma_handle);
  		fb_dealloc_cmap(&info->cmap);
  		framebuffer_release(info);
  	}
  
  	for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
  		if (priv->ch[i].bl)
  			sh_mobile_lcdc_bl_remove(priv->ch[i].bl);
  	}
  
  	if (priv->dot_clk)
  		clk_put(priv->dot_clk);
  
  	if (priv->dev)
  		pm_runtime_disable(priv->dev);
  
  	if (priv->base)
  		iounmap(priv->base);
  
  	if (priv->irq)
  		free_irq(priv->irq, priv);
  	kfree(priv);
  	return 0;
  }

  static int __devinit sh_mobile_lcdc_channel_init(struct sh_mobile_lcdc_chan *ch,
  						 struct device *dev)

  {

  	struct sh_mobile_lcdc_chan_cfg *cfg = &ch->cfg;
  	const struct fb_videomode *max_mode;
  	const struct fb_videomode *mode;
  	struct fb_var_screeninfo *var;

  	struct fb_info *info;

  	unsigned int max_size;
  	int num_cfg;
  	void *buf;
  	int ret;
  	int i;

  	mutex_init(&ch->open_lock);
  
  	/* Allocate the frame buffer device. */

  	ch->info = framebuffer_alloc(0, dev);
  	if (!ch->info) {
  		dev_err(dev, "unable to allocate fb_info
  ");
  		return -ENOMEM;
  	}
  
  	info = ch->info;

  	info->fbops = &sh_mobile_lcdc_ops;
  	info->par = ch;

  	info->pseudo_palette = &ch->pseudo_palette;
  	info->flags = FBINFO_FLAG_DEFAULT;

  
  	/* Iterate through the modes to validate them and find the highest
  	 * resolution.
  	 */
  	max_mode = NULL;
  	max_size = 0;
  
  	for (i = 0, mode = cfg->lcd_cfg; i < cfg->num_cfg; i++, mode++) {
  		unsigned int size = mode->yres * mode->xres;

  		/* NV12/NV21 buffers must have even number of lines */
  		if ((cfg->fourcc == V4L2_PIX_FMT_NV12 ||
  		     cfg->fourcc == V4L2_PIX_FMT_NV21) && (mode->yres & 0x1)) {

  			dev_err(dev, "yres must be multiple of 2 for YCbCr420 "
  				"mode.
  ");
  			return -EINVAL;
  		}
  
  		if (size > max_size) {
  			max_mode = mode;
  			max_size = size;
  		}
  	}
  
  	if (!max_size)
  		max_size = MAX_XRES * MAX_YRES;
  	else
  		dev_dbg(dev, "Found largest videomode %ux%u
  ",
  			max_mode->xres, max_mode->yres);

  	/* Create the mode list. */

  	if (cfg->lcd_cfg == NULL) {
  		mode = &default_720p;
  		num_cfg = 1;
  	} else {
  		mode = cfg->lcd_cfg;
  		num_cfg = cfg->num_cfg;
  	}
  
  	fb_videomode_to_modelist(mode, num_cfg, &info->modelist);

  	/* Initialize variable screen information using the first mode as
  	 * default. The default Y virtual resolution is twice the panel size to
  	 * allow for double-buffering.
  	 */
  	var = &info->var;

  	fb_videomode_to_var(var, mode);
  	var->width = cfg->lcd_size_cfg.width;
  	var->height = cfg->lcd_size_cfg.height;

  	var->yres_virtual = var->yres * 2;
  	var->activate = FB_ACTIVATE_NOW;

  	switch (cfg->fourcc) {
  	case V4L2_PIX_FMT_RGB565:
  		var->bits_per_pixel = 16;
  		break;
  	case V4L2_PIX_FMT_BGR24:
  		var->bits_per_pixel = 24;
  		break;
  	case V4L2_PIX_FMT_BGR32:
  		var->bits_per_pixel = 32;
  		break;
  	default:
  		var->grayscale = cfg->fourcc;
  		break;
  	}
  
  	/* Make sure the memory size check won't fail. smem_len is initialized
  	 * later based on var.
  	 */
  	info->fix.smem_len = UINT_MAX;

  	ret = sh_mobile_check_var(var, info);

  	if (ret)
  		return ret;

  	max_size = max_size * var->bits_per_pixel / 8 * 2;

  	/* Allocate frame buffer memory and color map. */

  	buf = dma_alloc_coherent(dev, max_size, &ch->dma_handle, GFP_KERNEL);

  	if (!buf) {
  		dev_err(dev, "unable to allocate buffer
  ");
  		return -ENOMEM;
  	}

  	ret = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
  	if (ret < 0) {
  		dev_err(dev, "unable to allocate cmap
  ");

  		dma_free_coherent(dev, max_size, buf, ch->dma_handle);

  		return ret;
  	}

  	/* Initialize fixed screen information. Restrict pan to 2 lines steps
  	 * for NV12 and NV21.
  	 */
  	info->fix = sh_mobile_lcdc_fix;

  	info->fix.smem_start = ch->dma_handle;

  	info->fix.smem_len = max_size;
  	if (cfg->fourcc == V4L2_PIX_FMT_NV12 ||
  	    cfg->fourcc == V4L2_PIX_FMT_NV21)
  		info->fix.ypanstep = 2;
  
  	if (sh_mobile_format_is_yuv(var)) {

  		info->fix.line_length = var->xres;

  		info->fix.visual = FB_VISUAL_FOURCC;
  	} else {
  		info->fix.line_length = var->xres * var->bits_per_pixel / 8;
  		info->fix.visual = FB_VISUAL_TRUECOLOR;
  	}

  
  	info->screen_base = buf;
  	info->device = dev;
  	ch->display_var = *var;
  
  	return 0;
  }
  
  static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev)
  {

  	struct sh_mobile_lcdc_info *pdata = pdev->dev.platform_data;

  	struct sh_mobile_lcdc_priv *priv;

  	struct resource *res;

  	int num_channels;

  	int error;

  	int i;

  	if (!pdata) {

  		dev_err(&pdev->dev, "no platform data defined
  ");

  		return -EINVAL;

  	}
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

  	i = platform_get_irq(pdev, 0);
  	if (!res || i < 0) {
  		dev_err(&pdev->dev, "cannot get platform resources
  ");

  		return -ENOENT;

  	}
  
  	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  	if (!priv) {
  		dev_err(&pdev->dev, "cannot allocate device data
  ");

  		return -ENOMEM;

  	}

  	platform_set_drvdata(pdev, priv);

  	error = request_irq(i, sh_mobile_lcdc_irq, 0,

  			    dev_name(&pdev->dev), priv);

  	if (error) {
  		dev_err(&pdev->dev, "unable to request irq
  ");
  		goto err1;
  	}
  
  	priv->irq = i;

  	atomic_set(&priv->hw_usecnt, -1);

  	for (i = 0, num_channels = 0; i < ARRAY_SIZE(pdata->ch); i++) {
  		struct sh_mobile_lcdc_chan *ch = priv->ch + num_channels;

  		ch->lcdc = priv;
  		memcpy(&ch->cfg, &pdata->ch[i], sizeof(pdata->ch[i]));

  		error = sh_mobile_lcdc_check_interface(ch);

  		if (error) {
  			dev_err(&pdev->dev, "unsupported interface type
  ");
  			goto err1;
  		}

  		init_waitqueue_head(&ch->frame_end_wait);
  		init_completion(&ch->vsync_completion);
  		ch->pan_offset = 0;

  		/* probe the backlight is there is one defined */
  		if (ch->cfg.bl_info.max_brightness)
  			ch->bl = sh_mobile_lcdc_bl_probe(&pdev->dev, ch);

  		switch (pdata->ch[i].chan) {
  		case LCDC_CHAN_MAINLCD:

  			ch->enabled = LDCNT2R_ME;

  			ch->reg_offs = lcdc_offs_mainlcd;

  			num_channels++;

  			break;
  		case LCDC_CHAN_SUBLCD:

  			ch->enabled = LDCNT2R_SE;

  			ch->reg_offs = lcdc_offs_sublcd;

  			num_channels++;

  			break;
  		}
  	}

  	if (!num_channels) {

  		dev_err(&pdev->dev, "no channels defined
  ");
  		error = -EINVAL;
  		goto err1;
  	}

  	/* for dual channel LCDC (MAIN + SUB) force shared format setting */

  	if (num_channels == 2)

  		priv->forced_fourcc = pdata->ch[0].fourcc;

  	priv->base = ioremap_nocache(res->start, resource_size(res));
  	if (!priv->base)
  		goto err1;

  	error = sh_mobile_lcdc_setup_clocks(pdev, pdata->clock_source, priv);

  	if (error) {
  		dev_err(&pdev->dev, "unable to setup clocks
  ");
  		goto err1;
  	}

  	priv->meram_dev = pdata->meram_dev;

  	for (i = 0; i < num_channels; i++) {

  		struct sh_mobile_lcdc_chan *ch = priv->ch + i;

  		error = sh_mobile_lcdc_channel_init(ch, &pdev->dev);

  		if (error)

  			goto err1;

  	}

  	error = sh_mobile_lcdc_start(priv);
  	if (error) {
  		dev_err(&pdev->dev, "unable to start hardware
  ");
  		goto err1;
  	}

  	for (i = 0; i < num_channels; i++) {

  		struct sh_mobile_lcdc_chan *ch = priv->ch + i;

  		struct fb_info *info = ch->info;

  
  		if (info->fbdefio) {

  			ch->sglist = vmalloc(sizeof(struct scatterlist) *

  					info->fix.smem_len >> PAGE_SHIFT);

  			if (!ch->sglist) {

  				dev_err(&pdev->dev, "cannot allocate sglist
  ");
  				goto err1;
  			}
  		}

  		info->bl_dev = ch->bl;

  		error = register_framebuffer(info);

  		if (error < 0)
  			goto err1;

  		dev_info(info->dev, "registered %s/%s as %dx%d %dbpp.
  ",
  			 pdev->name, (ch->cfg.chan == LCDC_CHAN_MAINLCD) ?
  			 "mainlcd" : "sublcd", info->var.xres, info->var.yres,
  			 info->var.bits_per_pixel);

  
  		/* deferred io mode: disable clock to save power */

  		if (info->fbdefio || info->state == FBINFO_STATE_SUSPENDED)

  			sh_mobile_lcdc_clk_off(priv);

  	}

  	/* Failure ignored */
  	priv->notifier.notifier_call = sh_mobile_lcdc_notify;
  	fb_register_client(&priv->notifier);

  	return 0;

  err1:

  	sh_mobile_lcdc_remove(pdev);

  	return error;
  }

  static struct platform_driver sh_mobile_lcdc_driver = {
  	.driver		= {
  		.name		= "sh_mobile_lcdc_fb",
  		.owner		= THIS_MODULE,

  		.pm		= &sh_mobile_lcdc_dev_pm_ops,

  	},
  	.probe		= sh_mobile_lcdc_probe,
  	.remove		= sh_mobile_lcdc_remove,
  };

  module_platform_driver(sh_mobile_lcdc_driver);

  
  MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
  MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
  MODULE_LICENSE("GPL v2");