/*
   * SuperH Mobile MERAM Driver for SuperH Mobile LCDC Driver
   *
   * Copyright (c) 2011	Damian Hobson-Garcia <dhobsong@igel.co.jp>
   *                      Takanari Hayama <taki@igel.co.jp>
   *
   * 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/module.h>
  #include <linux/device.h>

  #include <linux/pm_runtime.h>

  #include <linux/io.h>
  #include <linux/slab.h>
  #include <linux/platform_device.h>

  #include <video/sh_mobile_meram.h>

  
  /* meram registers */

  #define MEVCR1			0x4
  #define MEVCR1_RST		(1 << 31)
  #define MEVCR1_WD		(1 << 30)
  #define MEVCR1_AMD1		(1 << 29)
  #define MEVCR1_AMD0		(1 << 28)
  #define MEQSEL1			0x40
  #define MEQSEL2			0x44
  
  #define MExxCTL			0x400
  #define MExxCTL_BV		(1 << 31)
  #define MExxCTL_BSZ_SHIFT	28
  #define MExxCTL_MSAR_MASK	(0x7ff << MExxCTL_MSAR_SHIFT)
  #define MExxCTL_MSAR_SHIFT	16
  #define MExxCTL_NXT_MASK	(0x1f << MExxCTL_NXT_SHIFT)
  #define MExxCTL_NXT_SHIFT	11
  #define MExxCTL_WD1		(1 << 10)
  #define MExxCTL_WD0		(1 << 9)
  #define MExxCTL_WS		(1 << 8)
  #define MExxCTL_CB		(1 << 7)
  #define MExxCTL_WBF		(1 << 6)
  #define MExxCTL_WF		(1 << 5)
  #define MExxCTL_RF		(1 << 4)
  #define MExxCTL_CM		(1 << 3)
  #define MExxCTL_MD_READ		(1 << 0)
  #define MExxCTL_MD_WRITE	(2 << 0)
  #define MExxCTL_MD_ICB_WB	(3 << 0)
  #define MExxCTL_MD_ICB		(4 << 0)
  #define MExxCTL_MD_FB		(7 << 0)
  #define MExxCTL_MD_MASK		(7 << 0)
  #define MExxBSIZE		0x404
  #define MExxBSIZE_RCNT_SHIFT	28
  #define MExxBSIZE_YSZM1_SHIFT	16
  #define MExxBSIZE_XSZM1_SHIFT	0
  #define MExxMNCF		0x408
  #define MExxMNCF_KWBNM_SHIFT	28
  #define MExxMNCF_KRBNM_SHIFT	24
  #define MExxMNCF_BNM_SHIFT	16
  #define MExxMNCF_XBV		(1 << 15)
  #define MExxMNCF_CPL_YCBCR444	(1 << 12)
  #define MExxMNCF_CPL_YCBCR420	(2 << 12)
  #define MExxMNCF_CPL_YCBCR422	(3 << 12)
  #define MExxMNCF_CPL_MSK	(3 << 12)
  #define MExxMNCF_BL		(1 << 2)
  #define MExxMNCF_LNM_SHIFT	0
  #define MExxSARA		0x410
  #define MExxSARB		0x414
  #define MExxSBSIZE		0x418
  #define MExxSBSIZE_HDV		(1 << 31)
  #define MExxSBSIZE_HSZ16	(0 << 28)
  #define MExxSBSIZE_HSZ32	(1 << 28)
  #define MExxSBSIZE_HSZ64	(2 << 28)
  #define MExxSBSIZE_HSZ128	(3 << 28)
  #define MExxSBSIZE_SBSIZZ_SHIFT	0
  
  #define MERAM_MExxCTL_VAL(next, addr)	\
  	((((next) << MExxCTL_NXT_SHIFT) & MExxCTL_NXT_MASK) | \
  	 (((addr) << MExxCTL_MSAR_SHIFT) & MExxCTL_MSAR_MASK))
  #define	MERAM_MExxBSIZE_VAL(rcnt, yszm1, xszm1) \
  	(((rcnt) << MExxBSIZE_RCNT_SHIFT) | \
  	 ((yszm1) << MExxBSIZE_YSZM1_SHIFT) | \
  	 ((xszm1) << MExxBSIZE_XSZM1_SHIFT))

  #define SH_MOBILE_MERAM_ICB_NUM		32

  static unsigned long common_regs[] = {
  	MEVCR1,
  	MEQSEL1,
  	MEQSEL2,
  };
  #define CMN_REGS_SIZE ARRAY_SIZE(common_regs)
  
  static unsigned long icb_regs[] = {
  	MExxCTL,
  	MExxBSIZE,
  	MExxMNCF,
  	MExxSARA,
  	MExxSARB,
  	MExxSBSIZE,
  };
  #define ICB_REGS_SIZE ARRAY_SIZE(icb_regs)

  struct sh_mobile_meram_priv {
  	void __iomem	*base;
  	struct mutex	lock;
  	unsigned long	used_icb;
  	int		used_meram_cache_regions;
  	unsigned long	used_meram_cache[SH_MOBILE_MERAM_ICB_NUM];

  	unsigned long	cmn_saved_regs[CMN_REGS_SIZE];
  	unsigned long	icb_saved_regs[ICB_REGS_SIZE * SH_MOBILE_MERAM_ICB_NUM];

  };

  /* settings */
  #define MERAM_SEC_LINE 15
  #define MERAM_LINE_WIDTH 2048
  
  /*
   * MERAM/ICB access functions
   */

  #define MERAM_ICB_OFFSET(base, idx, off)	((base) + (off) + (idx) * 0x20)

  
  static inline void meram_write_icb(void __iomem *base, int idx, int off,
  	unsigned long val)
  {
  	iowrite32(val, MERAM_ICB_OFFSET(base, idx, off));
  }
  
  static inline unsigned long meram_read_icb(void __iomem *base, int idx, int off)
  {
  	return ioread32(MERAM_ICB_OFFSET(base, idx, off));
  }
  
  static inline void meram_write_reg(void __iomem *base, int off,
  		unsigned long val)
  {
  	iowrite32(val, base + off);
  }
  
  static inline unsigned long meram_read_reg(void __iomem *base, int off)
  {
  	return ioread32(base + off);
  }
  
  /*
   * register ICB
   */
  
  #define MERAM_CACHE_START(p)	 ((p) >> 16)
  #define MERAM_CACHE_END(p)	 ((p) & 0xffff)
  #define MERAM_CACHE_SET(o, s)	 ((((o) & 0xffff) << 16) | \
  				  (((o) + (s) - 1) & 0xffff))
  
  /*
   * check if there's no overlaps in MERAM allocation.
   */
  
  static inline int meram_check_overlap(struct sh_mobile_meram_priv *priv,
  				      struct sh_mobile_meram_icb *new)
  {
  	int i;
  	int used_start, used_end, meram_start, meram_end;
  
  	/* valid ICB? */
  	if (new->marker_icb & ~0x1f || new->cache_icb & ~0x1f)
  		return 1;
  
  	if (test_bit(new->marker_icb, &priv->used_icb) ||
  			test_bit(new->cache_icb,  &priv->used_icb))
  		return  1;
  
  	for (i = 0; i < priv->used_meram_cache_regions; i++) {
  		used_start = MERAM_CACHE_START(priv->used_meram_cache[i]);
  		used_end   = MERAM_CACHE_END(priv->used_meram_cache[i]);
  		meram_start = new->meram_offset;
  		meram_end   = new->meram_offset + new->meram_size;
  
  		if ((meram_start >= used_start && meram_start < used_end) ||
  			(meram_end > used_start && meram_end < used_end))
  			return 1;
  	}
  
  	return 0;
  }
  
  /*
   * mark the specified ICB as used
   */
  
  static inline void meram_mark(struct sh_mobile_meram_priv *priv,
  			      struct sh_mobile_meram_icb *new)
  {
  	int n;
  
  	if (new->marker_icb < 0 || new->cache_icb < 0)
  		return;
  
  	__set_bit(new->marker_icb, &priv->used_icb);
  	__set_bit(new->cache_icb, &priv->used_icb);
  
  	n = priv->used_meram_cache_regions;
  
  	priv->used_meram_cache[n] = MERAM_CACHE_SET(new->meram_offset,
  						    new->meram_size);
  
  	priv->used_meram_cache_regions++;
  }
  
  /*
   * unmark the specified ICB as used
   */
  
  static inline void meram_unmark(struct sh_mobile_meram_priv *priv,
  				struct sh_mobile_meram_icb *icb)
  {
  	int i;
  	unsigned long pattern;
  
  	if (icb->marker_icb < 0 || icb->cache_icb < 0)
  		return;
  
  	__clear_bit(icb->marker_icb, &priv->used_icb);
  	__clear_bit(icb->cache_icb, &priv->used_icb);
  
  	pattern = MERAM_CACHE_SET(icb->meram_offset, icb->meram_size);
  	for (i = 0; i < priv->used_meram_cache_regions; i++) {
  		if (priv->used_meram_cache[i] == pattern) {
  			while (i < priv->used_meram_cache_regions - 1) {
  				priv->used_meram_cache[i] =
  					priv->used_meram_cache[i + 1] ;
  				i++;
  			}
  			priv->used_meram_cache[i] = 0;
  			priv->used_meram_cache_regions--;
  			break;
  		}
  	}
  }

  /*
   * is this a YCbCr(NV12, NV16 or NV24) colorspace
   */
  static inline int is_nvcolor(int cspace)
  {
  	if (cspace == SH_MOBILE_MERAM_PF_NV ||
  			cspace == SH_MOBILE_MERAM_PF_NV24)
  		return 1;
  	return 0;
  }

  
  /*
   * set the next address to fetch
   */
  static inline void meram_set_next_addr(struct sh_mobile_meram_priv *priv,
  				       struct sh_mobile_meram_cfg *cfg,
  				       unsigned long base_addr_y,
  				       unsigned long base_addr_c)
  {
  	unsigned long target;
  
  	target = (cfg->current_reg) ? MExxSARA : MExxSARB;
  	cfg->current_reg ^= 1;
  
  	/* set the next address to fetch */
  	meram_write_icb(priv->base, cfg->icb[0].cache_icb,  target,
  			base_addr_y);
  	meram_write_icb(priv->base, cfg->icb[0].marker_icb, target,
  			base_addr_y + cfg->icb[0].cache_unit);

  	if (is_nvcolor(cfg->pixelformat)) {

  		meram_write_icb(priv->base, cfg->icb[1].cache_icb,  target,
  				base_addr_c);
  		meram_write_icb(priv->base, cfg->icb[1].marker_icb, target,
  				base_addr_c + cfg->icb[1].cache_unit);
  	}
  }
  
  /*
   * get the next ICB address
   */
  static inline void meram_get_next_icb_addr(struct sh_mobile_meram_info *pdata,
  					   struct sh_mobile_meram_cfg *cfg,
  					   unsigned long *icb_addr_y,
  					   unsigned long *icb_addr_c)
  {
  	unsigned long icb_offset;
  
  	if (pdata->addr_mode == SH_MOBILE_MERAM_MODE0)
  		icb_offset = 0x80000000 | (cfg->current_reg << 29);
  	else
  		icb_offset = 0xc0000000 | (cfg->current_reg << 23);
  
  	*icb_addr_y = icb_offset | (cfg->icb[0].marker_icb << 24);

  	if (is_nvcolor(cfg->pixelformat))

  		*icb_addr_c = icb_offset | (cfg->icb[1].marker_icb << 24);
  }
  
  #define MERAM_CALC_BYTECOUNT(x, y) \
  	(((x) * (y) + (MERAM_LINE_WIDTH - 1)) & ~(MERAM_LINE_WIDTH - 1))
  
  /*
   * initialize MERAM
   */
  
  static int meram_init(struct sh_mobile_meram_priv *priv,
  		      struct sh_mobile_meram_icb *icb,
  		      int xres, int yres, int *out_pitch)
  {
  	unsigned long total_byte_count = MERAM_CALC_BYTECOUNT(xres, yres);
  	unsigned long bnm;
  	int lcdc_pitch, xpitch, line_cnt;
  	int save_lines;
  
  	/* adjust pitch to 1024, 2048, 4096 or 8192 */
  	lcdc_pitch = (xres - 1) | 1023;
  	lcdc_pitch = lcdc_pitch | (lcdc_pitch >> 1);
  	lcdc_pitch = lcdc_pitch | (lcdc_pitch >> 2);
  	lcdc_pitch += 1;
  
  	/* derive settings */
  	if (lcdc_pitch == 8192 && yres >= 1024) {
  		lcdc_pitch = xpitch = MERAM_LINE_WIDTH;
  		line_cnt = total_byte_count >> 11;
  		*out_pitch = xres;
  		save_lines = (icb->meram_size / 16 / MERAM_SEC_LINE);
  		save_lines *= MERAM_SEC_LINE;
  	} else {
  		xpitch = xres;
  		line_cnt = yres;
  		*out_pitch = lcdc_pitch;
  		save_lines = icb->meram_size / (lcdc_pitch >> 10) / 2;
  		save_lines &= 0xff;
  	}
  	bnm = (save_lines - 1) << 16;
  
  	/* TODO: we better to check if we have enough MERAM buffer size */
  
  	/* set up ICB */
  	meram_write_icb(priv->base, icb->cache_icb,  MExxBSIZE,
  			MERAM_MExxBSIZE_VAL(0x0, line_cnt - 1, xpitch - 1));
  	meram_write_icb(priv->base, icb->marker_icb, MExxBSIZE,
  			MERAM_MExxBSIZE_VAL(0xf, line_cnt - 1, xpitch - 1));
  
  	meram_write_icb(priv->base, icb->cache_icb,  MExxMNCF, bnm);
  	meram_write_icb(priv->base, icb->marker_icb, MExxMNCF, bnm);
  
  	meram_write_icb(priv->base, icb->cache_icb,  MExxSBSIZE, xpitch);
  	meram_write_icb(priv->base, icb->marker_icb, MExxSBSIZE, xpitch);
  
  	/* save a cache unit size */
  	icb->cache_unit = xres * save_lines;
  
  	/*
  	 * Set MERAM for framebuffer
  	 *

  	 * we also chain the cache_icb and the marker_icb.
  	 * we also split the allocated MERAM buffer between two ICBs.
  	 */
  	meram_write_icb(priv->base, icb->cache_icb, MExxCTL,

  			MERAM_MExxCTL_VAL(icb->marker_icb, icb->meram_offset) |
  			MExxCTL_WD1 | MExxCTL_WD0 | MExxCTL_WS | MExxCTL_CM |
  			MExxCTL_MD_FB);

  	meram_write_icb(priv->base, icb->marker_icb, MExxCTL,

  			MERAM_MExxCTL_VAL(icb->cache_icb, icb->meram_offset +
  					  icb->meram_size / 2) |
  			MExxCTL_WD1 | MExxCTL_WD0 | MExxCTL_WS | MExxCTL_CM |
  			MExxCTL_MD_FB);

  
  	return 0;
  }
  
  static void meram_deinit(struct sh_mobile_meram_priv *priv,
  			struct sh_mobile_meram_icb *icb)
  {
  	/* disable ICB */

  	meram_write_icb(priv->base, icb->cache_icb,  MExxCTL,
  			MExxCTL_WBF | MExxCTL_WF | MExxCTL_RF);
  	meram_write_icb(priv->base, icb->marker_icb, MExxCTL,
  			MExxCTL_WBF | MExxCTL_WF | MExxCTL_RF);

  	icb->cache_unit = 0;
  }
  
  /*
   * register the ICB
   */
  
  static int sh_mobile_meram_register(struct sh_mobile_meram_info *pdata,
  				    struct sh_mobile_meram_cfg *cfg,
  				    int xres, int yres, int pixelformat,
  				    unsigned long base_addr_y,
  				    unsigned long base_addr_c,
  				    unsigned long *icb_addr_y,
  				    unsigned long *icb_addr_c,
  				    int *pitch)
  {
  	struct platform_device *pdev;
  	struct sh_mobile_meram_priv *priv;
  	int n, out_pitch;
  	int error = 0;
  
  	if (!pdata || !pdata->priv || !pdata->pdev || !cfg)
  		return -EINVAL;
  
  	if (pixelformat != SH_MOBILE_MERAM_PF_NV &&

  	    pixelformat != SH_MOBILE_MERAM_PF_NV24 &&

  	    pixelformat != SH_MOBILE_MERAM_PF_RGB)
  		return -EINVAL;
  
  	priv = pdata->priv;
  	pdev = pdata->pdev;
  
  	dev_dbg(&pdev->dev, "registering %dx%d (%s) (y=%08lx, c=%08lx)",
  		xres, yres, (!pixelformat) ? "yuv" : "rgb",
  		base_addr_y, base_addr_c);

  	/* we can't handle wider than 8192px */
  	if (xres > 8192) {
  		dev_err(&pdev->dev, "width exceeding the limit (> 8192).");

  		return -EINVAL;

  	}
  
  	/* do we have at least one ICB config? */
  	if (cfg->icb[0].marker_icb < 0 || cfg->icb[0].cache_icb < 0) {
  		dev_err(&pdev->dev, "at least one ICB is required.");

  		return -EINVAL;
  	}
  
  	mutex_lock(&priv->lock);
  
  	if (priv->used_meram_cache_regions + 2 > SH_MOBILE_MERAM_ICB_NUM) {
  		dev_err(&pdev->dev, "no more ICB available.");

  		error = -EINVAL;
  		goto err;
  	}
  
  	/* make sure that there's no overlaps */
  	if (meram_check_overlap(priv, &cfg->icb[0])) {
  		dev_err(&pdev->dev, "conflicting config detected.");
  		error = -EINVAL;
  		goto err;
  	}
  	n = 1;
  
  	/* do the same if we have the second ICB set */
  	if (cfg->icb[1].marker_icb >= 0 && cfg->icb[1].cache_icb >= 0) {
  		if (meram_check_overlap(priv, &cfg->icb[1])) {
  			dev_err(&pdev->dev, "conflicting config detected.");
  			error = -EINVAL;
  			goto err;
  		}
  		n = 2;
  	}

  	if (is_nvcolor(pixelformat) && n != 2) {

  		dev_err(&pdev->dev, "requires two ICB sets for planar Y/C.");
  		error =  -EINVAL;
  		goto err;
  	}
  
  	/* we now register the ICB */
  	cfg->pixelformat = pixelformat;
  	meram_mark(priv, &cfg->icb[0]);

  	if (is_nvcolor(pixelformat))

  		meram_mark(priv, &cfg->icb[1]);
  
  	/* initialize MERAM */
  	meram_init(priv, &cfg->icb[0], xres, yres, &out_pitch);
  	*pitch = out_pitch;
  	if (pixelformat == SH_MOBILE_MERAM_PF_NV)
  		meram_init(priv, &cfg->icb[1], xres, (yres + 1) / 2,
  			&out_pitch);

  	else if (pixelformat == SH_MOBILE_MERAM_PF_NV24)
  		meram_init(priv, &cfg->icb[1], 2 * xres, (yres + 1) / 2,
  			&out_pitch);

  
  	cfg->current_reg = 1;
  	meram_set_next_addr(priv, cfg, base_addr_y, base_addr_c);
  	meram_get_next_icb_addr(pdata, cfg, icb_addr_y, icb_addr_c);
  
  	dev_dbg(&pdev->dev, "registered - can access via y=%08lx, c=%08lx",
  		*icb_addr_y, *icb_addr_c);
  
  err:
  	mutex_unlock(&priv->lock);
  	return error;
  }
  
  static int sh_mobile_meram_unregister(struct sh_mobile_meram_info *pdata,
  				      struct sh_mobile_meram_cfg *cfg)
  {
  	struct sh_mobile_meram_priv *priv;
  
  	if (!pdata || !pdata->priv || !cfg)
  		return -EINVAL;
  
  	priv = pdata->priv;
  
  	mutex_lock(&priv->lock);
  
  	/* deinit & unmark */

  	if (is_nvcolor(cfg->pixelformat)) {

  		meram_deinit(priv, &cfg->icb[1]);
  		meram_unmark(priv, &cfg->icb[1]);
  	}
  	meram_deinit(priv, &cfg->icb[0]);
  	meram_unmark(priv, &cfg->icb[0]);
  
  	mutex_unlock(&priv->lock);
  
  	return 0;
  }
  
  static int sh_mobile_meram_update(struct sh_mobile_meram_info *pdata,
  				  struct sh_mobile_meram_cfg *cfg,
  				  unsigned long base_addr_y,
  				  unsigned long base_addr_c,
  				  unsigned long *icb_addr_y,
  				  unsigned long *icb_addr_c)
  {
  	struct sh_mobile_meram_priv *priv;
  
  	if (!pdata || !pdata->priv || !cfg)
  		return -EINVAL;
  
  	priv = pdata->priv;
  
  	mutex_lock(&priv->lock);
  
  	meram_set_next_addr(priv, cfg, base_addr_y, base_addr_c);
  	meram_get_next_icb_addr(pdata, cfg, icb_addr_y, icb_addr_c);
  
  	mutex_unlock(&priv->lock);
  
  	return 0;
  }

  static int sh_mobile_meram_runtime_suspend(struct device *dev)
  {
  	struct platform_device *pdev = to_platform_device(dev);
  	struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
  	int k, j;
  
  	for (k = 0; k < CMN_REGS_SIZE; k++)
  		priv->cmn_saved_regs[k] = meram_read_reg(priv->base,
  			common_regs[k]);
  
  	for (j = 0; j < 32; j++) {
  		if (!test_bit(j, &priv->used_icb))
  			continue;
  		for (k = 0; k < ICB_REGS_SIZE; k++) {
  			priv->icb_saved_regs[j * ICB_REGS_SIZE + k] =
  				meram_read_icb(priv->base, j, icb_regs[k]);
  			/* Reset ICB on resume */
  			if (icb_regs[k] == MExxCTL)

  				priv->icb_saved_regs[j * ICB_REGS_SIZE + k] |=

  					MExxCTL_WBF | MExxCTL_WF | MExxCTL_RF;

  		}
  	}
  	return 0;
  }
  
  static int sh_mobile_meram_runtime_resume(struct device *dev)
  {
  	struct platform_device *pdev = to_platform_device(dev);
  	struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
  	int k, j;
  
  	for (j = 0; j < 32; j++) {
  		if (!test_bit(j, &priv->used_icb))
  			continue;
  		for (k = 0; k < ICB_REGS_SIZE; k++) {
  			meram_write_icb(priv->base, j, icb_regs[k],
  			priv->icb_saved_regs[j * ICB_REGS_SIZE + k]);
  		}
  	}
  
  	for (k = 0; k < CMN_REGS_SIZE; k++)
  		meram_write_reg(priv->base, common_regs[k],
  			priv->cmn_saved_regs[k]);
  	return 0;
  }
  
  static const struct dev_pm_ops sh_mobile_meram_dev_pm_ops = {
  	.runtime_suspend = sh_mobile_meram_runtime_suspend,
  	.runtime_resume = sh_mobile_meram_runtime_resume,
  };

  static struct sh_mobile_meram_ops sh_mobile_meram_ops = {
  	.module			= THIS_MODULE,
  	.meram_register		= sh_mobile_meram_register,
  	.meram_unregister	= sh_mobile_meram_unregister,
  	.meram_update		= sh_mobile_meram_update,
  };
  
  /*
   * initialize MERAM
   */
  
  static int sh_mobile_meram_remove(struct platform_device *pdev);
  
  static int __devinit sh_mobile_meram_probe(struct platform_device *pdev)
  {
  	struct sh_mobile_meram_priv *priv;
  	struct sh_mobile_meram_info *pdata = pdev->dev.platform_data;
  	struct resource *res;
  	int error;
  
  	if (!pdata) {
  		dev_err(&pdev->dev, "no platform data defined
  ");
  		return -EINVAL;
  	}
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	if (!res) {
  		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);
  
  	/* initialize private data */
  	mutex_init(&priv->lock);
  	priv->base = ioremap_nocache(res->start, resource_size(res));
  	if (!priv->base) {
  		dev_err(&pdev->dev, "ioremap failed
  ");
  		error = -EFAULT;
  		goto err;
  	}
  	pdata->ops = &sh_mobile_meram_ops;
  	pdata->priv = priv;
  	pdata->pdev = pdev;
  
  	/* initialize ICB addressing mode */
  	if (pdata->addr_mode == SH_MOBILE_MERAM_MODE1)

  		meram_write_reg(priv->base, MEVCR1, MEVCR1_AMD1);

  	pm_runtime_enable(&pdev->dev);

  	dev_info(&pdev->dev, "sh_mobile_meram initialized.");
  
  	return 0;
  
  err:
  	sh_mobile_meram_remove(pdev);
  
  	return error;
  }
  
  
  static int sh_mobile_meram_remove(struct platform_device *pdev)
  {
  	struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);

  	pm_runtime_disable(&pdev->dev);

  	if (priv->base)
  		iounmap(priv->base);
  
  	mutex_destroy(&priv->lock);
  
  	kfree(priv);
  
  	return 0;
  }
  
  static struct platform_driver sh_mobile_meram_driver = {
  	.driver	= {
  		.name		= "sh_mobile_meram",
  		.owner		= THIS_MODULE,

  		.pm		= &sh_mobile_meram_dev_pm_ops,

  	},
  	.probe		= sh_mobile_meram_probe,
  	.remove		= sh_mobile_meram_remove,
  };

  module_platform_driver(sh_mobile_meram_driver);

  
  MODULE_DESCRIPTION("SuperH Mobile MERAM driver");
  MODULE_AUTHOR("Damian Hobson-Garcia / Takanari Hayama");
  MODULE_LICENSE("GPL v2");