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Commit 7caa4342 authored by Damian Hobson-Garcia's avatar Damian Hobson-Garcia Committed by Paul Mundt
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sh_mobile_meram: MERAM framework for LCDC 



Based on the patch by Takanari Hayama <taki@igel.co.jp>

Adds support framework necessary to use Media RAM (MERAM)
caching functionality with the LCDC.  The MERAM is accessed
through up to 4 Interconnect Buffers (ICBs).

ICB numbers and MERAM address ranges to use are specified in
by filling in the .meram_cfg member of the LCDC platform data

Signed-off-by: default avatarDamian Hobson-Garcia <dhobsong@igel.co.jp>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 71a86384

drivers/video/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -1986,6 +1986,18 @@ config FB_SH_MOBILE_HDMI 
	---help---

	  Driver for the on-chip SH-Mobile HDMI controller.



config FB_SH_MOBILE_MERAM

	tristate "SuperH Mobile MERAM read ahead support for LCDC"

	depends on FB_SH_MOBILE_LCDC

	default y

	---help---

	  Enable MERAM support for the SH-Mobile LCD controller.



	  This will allow for caching of the framebuffer to provide more

	  reliable access under heavy main memory bus traffic situations.

	  Up to 4 memory channels can be configured, allowing 4 RGB or

	  2 YCbCr framebuffers to be configured.



config FB_TMIO

	tristate "Toshiba Mobile IO FrameBuffer support"

	depends on FB && MFD_CORE

drivers/video/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -130,6 +130,7 @@ obj-$(CONFIG_FB_UDL) += udlfb.o 
obj-$(CONFIG_FB_XILINX)           += xilinxfb.o

obj-$(CONFIG_SH_MIPI_DSI)	  += sh_mipi_dsi.o

obj-$(CONFIG_FB_SH_MOBILE_HDMI)	  += sh_mobile_hdmi.o

obj-$(CONFIG_FB_SH_MOBILE_MERAM)  += sh_mobile_meram.o

obj-$(CONFIG_FB_SH_MOBILE_LCDC)	  += sh_mobile_lcdcfb.o

obj-$(CONFIG_FB_OMAP)             += omap/

obj-y                             += omap2/

drivers/video/sh_mobile_lcdcfb.c

+94 −9
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <asm/atomic.h>



#include "sh_mobile_lcdcfb.h"

#include "sh_mobile_meram.h"



#define SIDE_B_OFFSET 0x1000

#define MIRROR_OFFSET 0x2000
@@ -143,6 +144,7 @@ struct sh_mobile_lcdc_priv { 
	unsigned long saved_shared_regs[NR_SHARED_REGS];

	int started;

	int forced_bpp; /* 2 channel LCDC must share bpp setting */

	struct sh_mobile_meram_info *meram_dev;

};



static bool banked(int reg_nr)
@@ -564,6 +566,9 @@ static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv) 
	}



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

		unsigned long base_addr_y;

		unsigned long base_addr_c = 0;

		int pitch;

		ch = &priv->ch[k];



		if (!priv->ch[k].enabled)
@@ -598,16 +603,63 @@ static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv) 
		}

		lcdc_write_chan(ch, LDDFR, tmp);



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

		base_addr_c = base_addr_y +

				ch->info->var.xres *

				ch->info->var.yres_virtual;

		pitch = ch->info->fix.line_length;



		/* test if we can enable meram */

		if (ch->cfg.meram_cfg && priv->meram_dev) {

			struct sh_mobile_meram_cfg *cfg;

			struct sh_mobile_meram_info *mdev;

			unsigned long icb_addr_y, icb_addr_c;

			int icb_pitch;

			int pf;



			cfg = ch->cfg.meram_cfg;

			mdev = priv->meram_dev;

			/* we need to de-init configured ICBs before we

			 * we can re-initialize them.

			 */

			if (ch->meram_enabled)

				mdev->ops->meram_unregister(mdev, cfg);



			ch->meram_enabled = 0;



			if (ch->info->var.nonstd)

				pf = SH_MOBILE_MERAM_PF_NV;

			else

				pf = SH_MOBILE_MERAM_PF_RGB;



			ret = mdev->ops->meram_register(mdev, cfg, pitch,

						ch->info->var.yres,

						pf,

						base_addr_y,

						base_addr_c,

						&icb_addr_y,

						&icb_addr_c,

						&icb_pitch);

			if (!ret)  {

				/* set LDSA1R value */

				base_addr_y = icb_addr_y;

				pitch = icb_pitch;



				/* set LDSA2R value if required */

				if (base_addr_c)

					base_addr_c = icb_addr_c;



				ch->meram_enabled = 1;

			}

		}



		/* point out our frame buffer */

		lcdc_write_chan(ch, LDSA1R, ch->info->fix.smem_start);

		lcdc_write_chan(ch, LDSA1R, base_addr_y);

		if (ch->info->var.nonstd)

			lcdc_write_chan(ch, LDSA2R,

				ch->info->fix.smem_start +

				ch->info->var.xres *

				ch->info->var.yres_virtual);

			lcdc_write_chan(ch, LDSA2R, base_addr_c);



		/* set line size */

		lcdc_write_chan(ch, LDMLSR, ch->info->fix.line_length);

		lcdc_write_chan(ch, LDMLSR, pitch);



		/* setup deferred io if SYS bus */

		tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
@@ -692,6 +744,17 @@ static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv) 
			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 */
@@ -875,9 +938,29 @@ static int sh_mobile_fb_pan_display(struct fb_var_screeninfo *var, 
	} else

		base_addr_c = 0;



	if (!ch->meram_enabled) {

		lcdc_write_chan_mirror(ch, LDSA1R, base_addr_y);

		if (base_addr_c)

			lcdc_write_chan_mirror(ch, LDSA2R, base_addr_c);

	} else {

		struct sh_mobile_meram_cfg *cfg;

		struct sh_mobile_meram_info *mdev;

		unsigned long icb_addr_y, icb_addr_c;

		int ret;



		cfg = ch->cfg.meram_cfg;

		mdev = priv->meram_dev;

		ret = mdev->ops->meram_update(mdev, cfg,

					base_addr_y, base_addr_c,

					&icb_addr_y, &icb_addr_c);

		if (ret)

			return ret;



		lcdc_write_chan_mirror(ch, LDSA1R, icb_addr_y);

		if (icb_addr_c)

			lcdc_write_chan_mirror(ch, LDSA2R, icb_addr_c);



	}



	if (lcdc_chan_is_sublcd(ch))

		lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_SRS);
@@ -1420,6 +1503,8 @@ static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev) 
		goto err1;

	}



	priv->meram_dev = pdata->meram_dev;



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

		struct fb_var_screeninfo *var;

		const struct fb_videomode *lcd_cfg, *max_cfg = NULL;

drivers/video/sh_mobile_lcdcfb.h

+1 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ struct sh_mobile_lcdc_chan { 
	int use_count;

	int blank_status;

	struct mutex open_lock;		/* protects the use counter */

	int meram_enabled;

};



#endif

drivers/video/sh_mobile_meram.c

0 → 100644
+553 −0
Original line number Diff line number Diff line 
/*

 * 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/io.h>

#include <linux/slab.h>

#include <linux/platform_device.h>



#include "sh_mobile_meram.h"



/* meram registers */

#define MExxCTL 0x0

#define MExxBSIZE 0x4

#define MExxMNCF 0x8

#define MExxSARA 0x10

#define MExxSARB 0x14

#define MExxSBSIZE 0x18



#define MERAM_MExxCTL_VAL(ctl, next_icb, addr)	\

	((ctl) | (((next_icb) & 0x1f) << 11) | (((addr) & 0x7ff) << 16))

#define	MERAM_MExxBSIZE_VAL(a, b, c) \

	(((a) << 28) | ((b) << 16) | (c))



#define MEVCR1 0x4

#define MEACTS 0x10

#define MEQSEL1 0x40

#define MEQSEL2 0x44



/* settings */

#define MERAM_SEC_LINE 15

#define MERAM_LINE_WIDTH 2048



/*

 * MERAM/ICB access functions

 */



#define MERAM_ICB_OFFSET(base, idx, off)	\

	((base) + (0x400 + ((idx) * 0x20) + (off)))



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;

		}

	}

}





/*

 * 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 (cfg->pixelformat == SH_MOBILE_MERAM_PF_NV) {

		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 ((*icb_addr_c) && cfg->pixelformat == SH_MOBILE_MERAM_PF_NV)

		*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

	 *

	 * 0x70f:  WD = 0x3, WS=0x1, CM=0x1, MD=FB mode

	 * 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(0x70f, icb->marker_icb,

					  icb->meram_offset));

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

			MERAM_MExxCTL_VAL(0x70f, icb->cache_icb,

					  icb->meram_offset +

					  icb->meram_size / 2));



	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, 0);

	meram_write_icb(priv->base, icb->marker_icb, MExxCTL, 0);

	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_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);



	mutex_lock(&priv->lock);



	/* we can't handle wider than 8192px */

	if (xres > 8192) {

		dev_err(&pdev->dev, "width exceeding the limit (> 8192).");

		error = -EINVAL;

		goto err;

	}



	if (priv->used_meram_cache_regions + 2 > SH_MOBILE_MERAM_ICB_NUM) {

		dev_err(&pdev->dev, "no more ICB available.");

		error = -EINVAL;

		goto err;

	}



	/* 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.");

		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 (pixelformat == SH_MOBILE_MERAM_PF_NV && 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 (pixelformat == SH_MOBILE_MERAM_PF_NV)

		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);



	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 (cfg->pixelformat == SH_MOBILE_MERAM_PF_NV) {

		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 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\n");

		return -EINVAL;

	}



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res) {

		dev_err(&pdev->dev, "cannot get platform resources\n");

		return -ENOENT;

	}



	priv = kzalloc(sizeof(*priv), GFP_KERNEL);

	if (!priv) {

		dev_err(&pdev->dev, "cannot allocate device data\n");

		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\n");

		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, 1 << 29);



	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);



	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,

	},

	.probe		= sh_mobile_meram_probe,

	.remove		= sh_mobile_meram_remove,

};



static int __init sh_mobile_meram_init(void)

{

	return platform_driver_register(&sh_mobile_meram_driver);

}



static void __exit sh_mobile_meram_exit(void)

{

	platform_driver_unregister(&sh_mobile_meram_driver);

}



module_init(sh_mobile_meram_init);

module_exit(sh_mobile_meram_exit);



MODULE_DESCRIPTION("SuperH Mobile MERAM driver");

MODULE_AUTHOR("Damian Hobson-Garcia / Takanari Hayama");

MODULE_LICENSE("GPL v2");