linux/drivers/video/sh_mipi_dsi.c - nest-guard/1.0/linux - Git at Google

 /*
  * Renesas SH-mobile MIPI DSI support
  *
  * Copyright (C) 2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
  *
  * This is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
  * published by the Free Software Foundation.
  */

 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/types.h>

 #include <video/mipi_display.h>
 #include <video/sh_mipi_dsi.h>
 #include <video/sh_mobile_lcdc.h>

 #define CMTSRTCTR	0x80d0
 #define CMTSRTREQ	0x8070

 #define DSIINTE		0x0060

 /* E.g., sh7372 has 2 MIPI-DSIs - one for each LCDC */
 #define MAX_SH_MIPI_DSI 2

 struct sh_mipi {
 	void __iomem	*base;
 	struct clk	*dsit_clk;
 	struct clk	*dsip_clk;
 };

 static struct sh_mipi *mipi_dsi[MAX_SH_MIPI_DSI];

 /* Protect the above array */
 static DEFINE_MUTEX(array_lock);

 static struct sh_mipi *sh_mipi_by_handle(int handle)
 {
 	if (handle >= ARRAY_SIZE(mipi_dsi) || handle < 0)
 		return NULL;

 	return mipi_dsi[handle];
 }

 static int sh_mipi_send_short(struct sh_mipi *mipi, u8 dsi_cmd,
 			      u8 cmd, u8 param)
 {
 	u32 data = (dsi_cmd << 24) | (cmd << 16) | (param << 8);
 	int cnt = 100;

 	/* transmit a short packet to LCD panel */
 	iowrite32(1 | data, mipi->base + 0x80d0); /* CMTSRTCTR */
 	iowrite32(1, mipi->base + 0x8070); /* CMTSRTREQ */

 	while ((ioread32(mipi->base + 0x8070) & 1) && --cnt)
 		udelay(1);

 	return cnt ? 0 : -ETIMEDOUT;
 }

 #define LCD_CHAN2MIPI(c) ((c) < LCDC_CHAN_MAINLCD || (c) > LCDC_CHAN_SUBLCD ? \
 				-EINVAL : (c) - 1)

 static int sh_mipi_dcs(int handle, u8 cmd)
 {
 	struct sh_mipi *mipi = sh_mipi_by_handle(LCD_CHAN2MIPI(handle));
 	if (!mipi)
 		return -ENODEV;
 	return sh_mipi_send_short(mipi, MIPI_DSI_DCS_SHORT_WRITE, cmd, 0);
 }

 static int sh_mipi_dcs_param(int handle, u8 cmd, u8 param)
 {
 	struct sh_mipi *mipi = sh_mipi_by_handle(LCD_CHAN2MIPI(handle));
 	if (!mipi)
 		return -ENODEV;
 	return sh_mipi_send_short(mipi, MIPI_DSI_DCS_SHORT_WRITE_PARAM, cmd,
 				  param);
 }

 static void sh_mipi_dsi_enable(struct sh_mipi *mipi, bool enable)
 {
 	/*
 	 * enable LCDC data tx, transition to LPS after completion of each HS
 	 * packet
 	 */
 	iowrite32(0x00000002 | enable, mipi->base + 0x8000); /* DTCTR */
 }

 static void sh_mipi_shutdown(struct platform_device *pdev)
 {
 	struct sh_mipi *mipi = platform_get_drvdata(pdev);

 	sh_mipi_dsi_enable(mipi, false);
 }

 static void mipi_display_on(void *arg, struct fb_info *info)
 {
 	struct sh_mipi *mipi = arg;

 	sh_mipi_dsi_enable(mipi, true);
 }

 static void mipi_display_off(void *arg)
 {
 	struct sh_mipi *mipi = arg;

 	sh_mipi_dsi_enable(mipi, false);
 }

 static int __init sh_mipi_setup(struct sh_mipi *mipi,
 				struct sh_mipi_dsi_info *pdata)
 {
 	void __iomem *base = mipi->base;
 	struct sh_mobile_lcdc_chan_cfg *ch = pdata->lcd_chan;
 	u32 pctype, datatype, pixfmt;
 	u32 linelength;
 	bool yuv;

 	/*
 	 * Select data format. MIPI DSI is not hot-pluggable, so, we just use
 	 * the default videomode. If this ever becomes a problem, We'll have to
 	 * move this to mipi_display_on() above and use info->var.xres
 	 */
 	switch (pdata->data_format) {
 	case MIPI_RGB888:
 		pctype = 0;
 		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_24;
 		pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
 		linelength = ch->lcd_cfg[0].xres * 3;
 		yuv = false;
 		break;
 	case MIPI_RGB565:
 		pctype = 1;
 		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_16;
 		pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
 		linelength = ch->lcd_cfg[0].xres * 2;
 		yuv = false;
 		break;
 	case MIPI_RGB666_LP:
 		pctype = 2;
 		datatype = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
 		pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
 		linelength = ch->lcd_cfg[0].xres * 3;
 		yuv = false;
 		break;
 	case MIPI_RGB666:
 		pctype = 3;
 		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_18;
 		pixfmt = MIPI_DCS_PIXEL_FMT_18BIT;
 		linelength = (ch->lcd_cfg[0].xres * 18 + 7) / 8;
 		yuv = false;
 		break;
 	case MIPI_BGR888:
 		pctype = 8;
 		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_24;
 		pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
 		linelength = ch->lcd_cfg[0].xres * 3;
 		yuv = false;
 		break;
 	case MIPI_BGR565:
 		pctype = 9;
 		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_16;
 		pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
 		linelength = ch->lcd_cfg[0].xres * 2;
 		yuv = false;
 		break;
 	case MIPI_BGR666_LP:
 		pctype = 0xa;
 		datatype = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
 		pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
 		linelength = ch->lcd_cfg[0].xres * 3;
 		yuv = false;
 		break;
 	case MIPI_BGR666:
 		pctype = 0xb;
 		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_18;
 		pixfmt = MIPI_DCS_PIXEL_FMT_18BIT;
 		linelength = (ch->lcd_cfg[0].xres * 18 + 7) / 8;
 		yuv = false;
 		break;
 	case MIPI_YUYV:
 		pctype = 4;
 		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16;
 		pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
 		linelength = ch->lcd_cfg[0].xres * 2;
 		yuv = true;
 		break;
 	case MIPI_UYVY:
 		pctype = 5;
 		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16;
 		pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
 		linelength = ch->lcd_cfg[0].xres * 2;
 		yuv = true;
 		break;
 	case MIPI_YUV420_L:
 		pctype = 6;
 		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12;
 		pixfmt = MIPI_DCS_PIXEL_FMT_12BIT;
 		linelength = (ch->lcd_cfg[0].xres * 12 + 7) / 8;
 		yuv = true;
 		break;
 	case MIPI_YUV420:
 		pctype = 7;
 		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12;
 		pixfmt = MIPI_DCS_PIXEL_FMT_12BIT;
 		/* Length of U/V line */
 		linelength = (ch->lcd_cfg[0].xres + 1) / 2;
 		yuv = true;
 		break;
 	default:
 		return -EINVAL;
 	}

 	if ((yuv && ch->interface_type != YUV422) ||
 	    (!yuv && ch->interface_type != RGB24))
 		return -EINVAL;

 	/* reset DSI link */
 	iowrite32(0x00000001, base); /* SYSCTRL */
 	/* Hold reset for 100 cycles of the slowest of bus, HS byte and LP clock */
 	udelay(50);
 	iowrite32(0x00000000, base); /* SYSCTRL */

 	/* setup DSI link */

 	/*
 	 * Default = ULPS enable |
 	 *	Contention detection enabled |
 	 *	EoT packet transmission enable |
 	 *	CRC check enable |
 	 *	ECC check enable
 	 * additionally enable first two lanes
 	 */
 	iowrite32(0x00003703, base + 0x04); /* SYSCONF */
 	/*
 	 * T_wakeup = 0x7000
 	 * T_hs-trail = 3
 	 * T_hs-prepare = 3
 	 * T_clk-trail = 3
 	 * T_clk-prepare = 2
 	 */
 	iowrite32(0x70003332, base + 0x08); /* TIMSET */
 	/* no responses requested */
 	iowrite32(0x00000000, base + 0x18); /* RESREQSET0 */
 	/* request response to packets of type 0x28 */
 	iowrite32(0x00000100, base + 0x1c); /* RESREQSET1 */
 	/* High-speed transmission timeout, default 0xffffffff */
 	iowrite32(0x0fffffff, base + 0x20); /* HSTTOVSET */
 	/* LP reception timeout, default 0xffffffff */
 	iowrite32(0x0fffffff, base + 0x24); /* LPRTOVSET */
 	/* Turn-around timeout, default 0xffffffff */
 	iowrite32(0x0fffffff, base + 0x28); /* TATOVSET */
 	/* Peripheral reset timeout, default 0xffffffff */
 	iowrite32(0x0fffffff, base + 0x2c); /* PRTOVSET */
 	/* Enable timeout counters */
 	iowrite32(0x00000f00, base + 0x30); /* DSICTRL */
 	/* Interrupts not used, disable all */
 	iowrite32(0, base + DSIINTE);
 	/* DSI-Tx bias on */
 	iowrite32(0x00000001, base + 0x70); /* PHYCTRL */
 	udelay(200);
 	/* Deassert resets, power on, set multiplier */
 	iowrite32(0x03070b01, base + 0x70); /* PHYCTRL */

 	/* setup l-bridge */

 	/*
 	 * Enable transmission of all packets,
 	 * transmit LPS after each HS packet completion
 	 */
 	iowrite32(0x00000006, base + 0x8000); /* DTCTR */
 	/* VSYNC width = 2 (<< 17) */
 	iowrite32(0x00040000 | (pctype << 12) | datatype, base + 0x8020); /* VMCTR1 */
 	/*
 	 * Non-burst mode with sync pulses: VSE and HSE are output,
 	 * HSA period allowed, no commands in LP
 	 */
 	iowrite32(0x00e00000, base + 0x8024); /* VMCTR2 */
 	/*
 	 * 0x660 = 1632 bytes per line (RGB24, 544 pixels: see
 	 * sh_mobile_lcdc_info.ch[0].lcd_cfg[0].xres), HSALEN = 1 - default
 	 * (unused, since VMCTR2[HSABM] = 0)
 	 */
 	iowrite32(1 | (linelength << 16), base + 0x8028); /* VMLEN1 */

 	msleep(5);

 	/* setup LCD panel */

 	/* cf. drivers/video/omap/lcd_mipid.c */
 	sh_mipi_dcs(ch->chan, MIPI_DCS_EXIT_SLEEP_MODE);
 	msleep(120);
 	/*
 	 * [7] - Page Address Mode
 	 * [6] - Column Address Mode
 	 * [5] - Page / Column Address Mode
 	 * [4] - Display Device Line Refresh Order
 	 * [3] - RGB/BGR Order
 	 * [2] - Display Data Latch Data Order
 	 * [1] - Flip Horizontal
 	 * [0] - Flip Vertical
 	 */
 	sh_mipi_dcs_param(ch->chan, MIPI_DCS_SET_ADDRESS_MODE, 0x00);
 	/* cf. set_data_lines() */
 	sh_mipi_dcs_param(ch->chan, MIPI_DCS_SET_PIXEL_FORMAT,
 			  pixfmt << 4);
 	sh_mipi_dcs(ch->chan, MIPI_DCS_SET_DISPLAY_ON);

 	return 0;
 }

 static int __init sh_mipi_probe(struct platform_device *pdev)
 {
 	struct sh_mipi *mipi;
 	struct sh_mipi_dsi_info *pdata = pdev->dev.platform_data;
 	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	unsigned long rate, f_current;
 	int idx = pdev->id, ret;
 	char dsip_clk[] = "dsi.p_clk";

 	if (!res || idx >= ARRAY_SIZE(mipi_dsi) || !pdata)
 		return -ENODEV;

 	mutex_lock(&array_lock);
 	if (idx < 0)
 		for (idx = 0; idx < ARRAY_SIZE(mipi_dsi) && mipi_dsi[idx]; idx++)
 			;

 	if (idx == ARRAY_SIZE(mipi_dsi)) {
 		ret = -EBUSY;
 		goto efindslot;
 	}

 	mipi = kzalloc(sizeof(*mipi), GFP_KERNEL);
 	if (!mipi) {
 		ret = -ENOMEM;
 		goto ealloc;
 	}

 	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
 		dev_err(&pdev->dev, "MIPI register region already claimed\n");
 		ret = -EBUSY;
 		goto ereqreg;
 	}

 	mipi->base = ioremap(res->start, resource_size(res));
 	if (!mipi->base) {
 		ret = -ENOMEM;
 		goto emap;
 	}

 	mipi->dsit_clk = clk_get(&pdev->dev, "dsit_clk");
 	if (IS_ERR(mipi->dsit_clk)) {
 		ret = PTR_ERR(mipi->dsit_clk);
 		goto eclktget;
 	}

 	f_current = clk_get_rate(mipi->dsit_clk);
 	/* 80MHz required by the datasheet */
 	rate = clk_round_rate(mipi->dsit_clk, 80000000);
 	if (rate > 0 && rate != f_current)
 		ret = clk_set_rate(mipi->dsit_clk, rate);
 	else
 		ret = rate;
 	if (ret < 0)
 		goto esettrate;

 	dev_dbg(&pdev->dev, "DSI-T clk %lu -> %lu\n", f_current, rate);

 	sprintf(dsip_clk, "dsi%1.1dp_clk", idx);
 	mipi->dsip_clk = clk_get(&pdev->dev, dsip_clk);
 	if (IS_ERR(mipi->dsip_clk)) {
 		ret = PTR_ERR(mipi->dsip_clk);
 		goto eclkpget;
 	}

 	f_current = clk_get_rate(mipi->dsip_clk);
 	/* Between 10 and 50MHz */
 	rate = clk_round_rate(mipi->dsip_clk, 24000000);
 	if (rate > 0 && rate != f_current)
 		ret = clk_set_rate(mipi->dsip_clk, rate);
 	else
 		ret = rate;
 	if (ret < 0)
 		goto esetprate;

 	dev_dbg(&pdev->dev, "DSI-P clk %lu -> %lu\n", f_current, rate);

 	msleep(10);

 	ret = clk_enable(mipi->dsit_clk);
 	if (ret < 0)
 		goto eclkton;

 	ret = clk_enable(mipi->dsip_clk);
 	if (ret < 0)
 		goto eclkpon;

 	mipi_dsi[idx] = mipi;

 	ret = sh_mipi_setup(mipi, pdata);
 	if (ret < 0)
 		goto emipisetup;

 	mutex_unlock(&array_lock);
 	platform_set_drvdata(pdev, mipi);

 	/* Set up LCDC callbacks */
 	pdata->lcd_chan->board_cfg.board_data = mipi;
 	pdata->lcd_chan->board_cfg.display_on = mipi_display_on;
 	pdata->lcd_chan->board_cfg.display_off = mipi_display_off;

 	return 0;

 emipisetup:
 	mipi_dsi[idx] = NULL;
 	clk_disable(mipi->dsip_clk);
 eclkpon:
 	clk_disable(mipi->dsit_clk);
 eclkton:
 esetprate:
 	clk_put(mipi->dsip_clk);
 eclkpget:
 esettrate:
 	clk_put(mipi->dsit_clk);
 eclktget:
 	iounmap(mipi->base);
 emap:
 	release_mem_region(res->start, resource_size(res));
 ereqreg:
 	kfree(mipi);
 ealloc:
 efindslot:
 	mutex_unlock(&array_lock);

 	return ret;
 }

 static int __exit sh_mipi_remove(struct platform_device *pdev)
 {
 	struct sh_mipi_dsi_info *pdata = pdev->dev.platform_data;
 	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	struct sh_mipi *mipi = platform_get_drvdata(pdev);
 	int i, ret;

 	mutex_lock(&array_lock);

 	for (i = 0; i < ARRAY_SIZE(mipi_dsi) && mipi_dsi[i] != mipi; i++)
 		;

 	if (i == ARRAY_SIZE(mipi_dsi)) {
 		ret = -EINVAL;
 	} else {
 		ret = 0;
 		mipi_dsi[i] = NULL;
 	}

 	mutex_unlock(&array_lock);

 	if (ret < 0)
 		return ret;

 	pdata->lcd_chan->board_cfg.display_on = NULL;
 	pdata->lcd_chan->board_cfg.display_off = NULL;
 	pdata->lcd_chan->board_cfg.board_data = NULL;

 	clk_disable(mipi->dsip_clk);
 	clk_disable(mipi->dsit_clk);
 	clk_put(mipi->dsit_clk);
 	clk_put(mipi->dsip_clk);
 	iounmap(mipi->base);
 	if (res)
 		release_mem_region(res->start, resource_size(res));
 	platform_set_drvdata(pdev, NULL);
 	kfree(mipi);

 	return 0;
 }

 static struct platform_driver sh_mipi_driver = {
 	.remove		= __exit_p(sh_mipi_remove),
 	.shutdown	= sh_mipi_shutdown,
 	.driver = {
 		.name	= "sh-mipi-dsi",
 	},
 };

 static int __init sh_mipi_init(void)
 {
 	return platform_driver_probe(&sh_mipi_driver, sh_mipi_probe);
 }
 module_init(sh_mipi_init);

 static void __exit sh_mipi_exit(void)
 {
 	platform_driver_unregister(&sh_mipi_driver);
 }
 module_exit(sh_mipi_exit);

 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 MODULE_DESCRIPTION("SuperH / ARM-shmobile MIPI DSI driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Renesas SH-mobile MIPI DSI support
	*
	* Copyright (C) 2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
	*
	* This is free software; you can redistribute it and/or modify
	* it under the terms of version 2 of the GNU General Public License as
	* published by the Free Software Foundation.
	*/

	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/string.h>
	#include <linux/types.h>

	#include <video/mipi_display.h>
	#include <video/sh_mipi_dsi.h>
	#include <video/sh_mobile_lcdc.h>

	#define CMTSRTCTR 0x80d0
	#define CMTSRTREQ 0x8070

	#define DSIINTE 0x0060

	/* E.g., sh7372 has 2 MIPI-DSIs - one for each LCDC */
	#define MAX_SH_MIPI_DSI 2

	struct sh_mipi {
	void __iomem *base;
	struct clk *dsit_clk;
	struct clk *dsip_clk;
	};

	static struct sh_mipi *mipi_dsi[MAX_SH_MIPI_DSI];

	/* Protect the above array */
	static DEFINE_MUTEX(array_lock);

	static struct sh_mipi *sh_mipi_by_handle(int handle)
	{
	if (handle >= ARRAY_SIZE(mipi_dsi) \|\| handle < 0)
	return NULL;

	return mipi_dsi[handle];
	}

	static int sh_mipi_send_short(struct sh_mipi *mipi, u8 dsi_cmd,
	u8 cmd, u8 param)
	{
	u32 data = (dsi_cmd << 24) \| (cmd << 16) \| (param << 8);
	int cnt = 100;

	/* transmit a short packet to LCD panel */
	iowrite32(1 \| data, mipi->base + 0x80d0); /* CMTSRTCTR */
	iowrite32(1, mipi->base + 0x8070); /* CMTSRTREQ */

	while ((ioread32(mipi->base + 0x8070) & 1) && --cnt)
	udelay(1);

	return cnt ? 0 : -ETIMEDOUT;
	}

	#define LCD_CHAN2MIPI(c) ((c) < LCDC_CHAN_MAINLCD \|\| (c) > LCDC_CHAN_SUBLCD ? \
	-EINVAL : (c) - 1)

	static int sh_mipi_dcs(int handle, u8 cmd)
	{
	struct sh_mipi *mipi = sh_mipi_by_handle(LCD_CHAN2MIPI(handle));
	if (!mipi)
	return -ENODEV;
	return sh_mipi_send_short(mipi, MIPI_DSI_DCS_SHORT_WRITE, cmd, 0);
	}

	static int sh_mipi_dcs_param(int handle, u8 cmd, u8 param)
	{
	struct sh_mipi *mipi = sh_mipi_by_handle(LCD_CHAN2MIPI(handle));
	if (!mipi)
	return -ENODEV;
	return sh_mipi_send_short(mipi, MIPI_DSI_DCS_SHORT_WRITE_PARAM, cmd,
	param);
	}

	static void sh_mipi_dsi_enable(struct sh_mipi *mipi, bool enable)
	{
	/*
	* enable LCDC data tx, transition to LPS after completion of each HS
	* packet
	*/
	iowrite32(0x00000002 \| enable, mipi->base + 0x8000); /* DTCTR */
	}

	static void sh_mipi_shutdown(struct platform_device *pdev)
	{
	struct sh_mipi *mipi = platform_get_drvdata(pdev);

	sh_mipi_dsi_enable(mipi, false);
	}

	static void mipi_display_on(void arg, struct fb_info info)
	{
	struct sh_mipi *mipi = arg;

	sh_mipi_dsi_enable(mipi, true);
	}

	static void mipi_display_off(void *arg)
	{
	struct sh_mipi *mipi = arg;

	sh_mipi_dsi_enable(mipi, false);
	}

	static int __init sh_mipi_setup(struct sh_mipi *mipi,
	struct sh_mipi_dsi_info *pdata)
	{
	void __iomem *base = mipi->base;
	struct sh_mobile_lcdc_chan_cfg *ch = pdata->lcd_chan;
	u32 pctype, datatype, pixfmt;
	u32 linelength;
	bool yuv;

	/*
	* Select data format. MIPI DSI is not hot-pluggable, so, we just use
	* the default videomode. If this ever becomes a problem, We'll have to
	* move this to mipi_display_on() above and use info->var.xres
	*/
	switch (pdata->data_format) {
	case MIPI_RGB888:
	pctype = 0;
	datatype = MIPI_DSI_PACKED_PIXEL_STREAM_24;
	pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
	linelength = ch->lcd_cfg[0].xres * 3;
	yuv = false;
	break;
	case MIPI_RGB565:
	pctype = 1;
	datatype = MIPI_DSI_PACKED_PIXEL_STREAM_16;
	pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
	linelength = ch->lcd_cfg[0].xres * 2;
	yuv = false;
	break;
	case MIPI_RGB666_LP:
	pctype = 2;
	datatype = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
	pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
	linelength = ch->lcd_cfg[0].xres * 3;
	yuv = false;
	break;
	case MIPI_RGB666:
	pctype = 3;
	datatype = MIPI_DSI_PACKED_PIXEL_STREAM_18;
	pixfmt = MIPI_DCS_PIXEL_FMT_18BIT;
	linelength = (ch->lcd_cfg[0].xres * 18 + 7) / 8;
	yuv = false;
	break;
	case MIPI_BGR888:
	pctype = 8;
	datatype = MIPI_DSI_PACKED_PIXEL_STREAM_24;
	pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
	linelength = ch->lcd_cfg[0].xres * 3;
	yuv = false;
	break;
	case MIPI_BGR565:
	pctype = 9;
	datatype = MIPI_DSI_PACKED_PIXEL_STREAM_16;
	pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
	linelength = ch->lcd_cfg[0].xres * 2;
	yuv = false;
	break;
	case MIPI_BGR666_LP:
	pctype = 0xa;
	datatype = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
	pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
	linelength = ch->lcd_cfg[0].xres * 3;
	yuv = false;
	break;
	case MIPI_BGR666:
	pctype = 0xb;
	datatype = MIPI_DSI_PACKED_PIXEL_STREAM_18;
	pixfmt = MIPI_DCS_PIXEL_FMT_18BIT;
	linelength = (ch->lcd_cfg[0].xres * 18 + 7) / 8;
	yuv = false;
	break;
	case MIPI_YUYV:
	pctype = 4;
	datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16;
	pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
	linelength = ch->lcd_cfg[0].xres * 2;
	yuv = true;
	break;
	case MIPI_UYVY:
	pctype = 5;
	datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16;
	pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
	linelength = ch->lcd_cfg[0].xres * 2;
	yuv = true;
	break;
	case MIPI_YUV420_L:
	pctype = 6;
	datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12;
	pixfmt = MIPI_DCS_PIXEL_FMT_12BIT;
	linelength = (ch->lcd_cfg[0].xres * 12 + 7) / 8;
	yuv = true;
	break;
	case MIPI_YUV420:
	pctype = 7;
	datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12;
	pixfmt = MIPI_DCS_PIXEL_FMT_12BIT;
	/* Length of U/V line */
	linelength = (ch->lcd_cfg[0].xres + 1) / 2;
	yuv = true;
	break;
	default:
	return -EINVAL;
	}

	if ((yuv && ch->interface_type != YUV422) \|\|
	(!yuv && ch->interface_type != RGB24))
	return -EINVAL;

	/* reset DSI link */
	iowrite32(0x00000001, base); /* SYSCTRL */
	/* Hold reset for 100 cycles of the slowest of bus, HS byte and LP clock */
	udelay(50);
	iowrite32(0x00000000, base); /* SYSCTRL */

	/* setup DSI link */

	/*
	* Default = ULPS enable \|
	* Contention detection enabled \|
	* EoT packet transmission enable \|
	* CRC check enable \|
	* ECC check enable
	* additionally enable first two lanes
	*/
	iowrite32(0x00003703, base + 0x04); /* SYSCONF */
	/*
	* T_wakeup = 0x7000
	* T_hs-trail = 3
	* T_hs-prepare = 3
	* T_clk-trail = 3
	* T_clk-prepare = 2
	*/
	iowrite32(0x70003332, base + 0x08); /* TIMSET */
	/* no responses requested */
	iowrite32(0x00000000, base + 0x18); /* RESREQSET0 */
	/* request response to packets of type 0x28 */
	iowrite32(0x00000100, base + 0x1c); /* RESREQSET1 */
	/* High-speed transmission timeout, default 0xffffffff */
	iowrite32(0x0fffffff, base + 0x20); /* HSTTOVSET */
	/* LP reception timeout, default 0xffffffff */
	iowrite32(0x0fffffff, base + 0x24); /* LPRTOVSET */
	/* Turn-around timeout, default 0xffffffff */
	iowrite32(0x0fffffff, base + 0x28); /* TATOVSET */
	/* Peripheral reset timeout, default 0xffffffff */
	iowrite32(0x0fffffff, base + 0x2c); /* PRTOVSET */
	/* Enable timeout counters */
	iowrite32(0x00000f00, base + 0x30); /* DSICTRL */
	/* Interrupts not used, disable all */
	iowrite32(0, base + DSIINTE);
	/* DSI-Tx bias on */
	iowrite32(0x00000001, base + 0x70); /* PHYCTRL */
	udelay(200);
	/* Deassert resets, power on, set multiplier */
	iowrite32(0x03070b01, base + 0x70); /* PHYCTRL */

	/* setup l-bridge */

	/*
	* Enable transmission of all packets,
	* transmit LPS after each HS packet completion
	*/
	iowrite32(0x00000006, base + 0x8000); /* DTCTR */
	/* VSYNC width = 2 (<< 17) */
	iowrite32(0x00040000 \| (pctype << 12) \| datatype, base + 0x8020); /* VMCTR1 */
	/*
	* Non-burst mode with sync pulses: VSE and HSE are output,
	* HSA period allowed, no commands in LP
	*/
	iowrite32(0x00e00000, base + 0x8024); /* VMCTR2 */
	/*
	* 0x660 = 1632 bytes per line (RGB24, 544 pixels: see
	* sh_mobile_lcdc_info.ch[0].lcd_cfg[0].xres), HSALEN = 1 - default
	* (unused, since VMCTR2[HSABM] = 0)
	*/
	iowrite32(1 \| (linelength << 16), base + 0x8028); /* VMLEN1 */

	msleep(5);

	/* setup LCD panel */

	/* cf. drivers/video/omap/lcd_mipid.c */
	sh_mipi_dcs(ch->chan, MIPI_DCS_EXIT_SLEEP_MODE);
	msleep(120);
	/*
	* [7] - Page Address Mode
	* [6] - Column Address Mode
	* [5] - Page / Column Address Mode
	* [4] - Display Device Line Refresh Order
	* [3] - RGB/BGR Order
	* [2] - Display Data Latch Data Order
	* [1] - Flip Horizontal
	* [0] - Flip Vertical
	*/
	sh_mipi_dcs_param(ch->chan, MIPI_DCS_SET_ADDRESS_MODE, 0x00);
	/* cf. set_data_lines() */
	sh_mipi_dcs_param(ch->chan, MIPI_DCS_SET_PIXEL_FORMAT,
	pixfmt << 4);
	sh_mipi_dcs(ch->chan, MIPI_DCS_SET_DISPLAY_ON);

	return 0;
	}

	static int __init sh_mipi_probe(struct platform_device *pdev)
	{
	struct sh_mipi *mipi;
	struct sh_mipi_dsi_info *pdata = pdev->dev.platform_data;
	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	unsigned long rate, f_current;
	int idx = pdev->id, ret;
	char dsip_clk[] = "dsi.p_clk";

	if (!res \|\| idx >= ARRAY_SIZE(mipi_dsi) \|\| !pdata)
	return -ENODEV;

	mutex_lock(&array_lock);
	if (idx < 0)
	for (idx = 0; idx < ARRAY_SIZE(mipi_dsi) && mipi_dsi[idx]; idx++)
	;

	if (idx == ARRAY_SIZE(mipi_dsi)) {
	ret = -EBUSY;
	goto efindslot;
	}

	mipi = kzalloc(sizeof(*mipi), GFP_KERNEL);
	if (!mipi) {
	ret = -ENOMEM;
	goto ealloc;
	}

	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
	dev_err(&pdev->dev, "MIPI register region already claimed\n");
	ret = -EBUSY;
	goto ereqreg;
	}

	mipi->base = ioremap(res->start, resource_size(res));
	if (!mipi->base) {
	ret = -ENOMEM;
	goto emap;
	}

	mipi->dsit_clk = clk_get(&pdev->dev, "dsit_clk");
	if (IS_ERR(mipi->dsit_clk)) {
	ret = PTR_ERR(mipi->dsit_clk);
	goto eclktget;
	}

	f_current = clk_get_rate(mipi->dsit_clk);
	/* 80MHz required by the datasheet */
	rate = clk_round_rate(mipi->dsit_clk, 80000000);
	if (rate > 0 && rate != f_current)
	ret = clk_set_rate(mipi->dsit_clk, rate);
	else
	ret = rate;
	if (ret < 0)
	goto esettrate;

	dev_dbg(&pdev->dev, "DSI-T clk %lu -> %lu\n", f_current, rate);

	sprintf(dsip_clk, "dsi%1.1dp_clk", idx);
	mipi->dsip_clk = clk_get(&pdev->dev, dsip_clk);
	if (IS_ERR(mipi->dsip_clk)) {
	ret = PTR_ERR(mipi->dsip_clk);
	goto eclkpget;
	}

	f_current = clk_get_rate(mipi->dsip_clk);
	/* Between 10 and 50MHz */
	rate = clk_round_rate(mipi->dsip_clk, 24000000);
	if (rate > 0 && rate != f_current)
	ret = clk_set_rate(mipi->dsip_clk, rate);
	else
	ret = rate;
	if (ret < 0)
	goto esetprate;

	dev_dbg(&pdev->dev, "DSI-P clk %lu -> %lu\n", f_current, rate);

	msleep(10);

	ret = clk_enable(mipi->dsit_clk);
	if (ret < 0)
	goto eclkton;

	ret = clk_enable(mipi->dsip_clk);
	if (ret < 0)
	goto eclkpon;

	mipi_dsi[idx] = mipi;

	ret = sh_mipi_setup(mipi, pdata);
	if (ret < 0)
	goto emipisetup;

	mutex_unlock(&array_lock);
	platform_set_drvdata(pdev, mipi);

	/* Set up LCDC callbacks */
	pdata->lcd_chan->board_cfg.board_data = mipi;
	pdata->lcd_chan->board_cfg.display_on = mipi_display_on;
	pdata->lcd_chan->board_cfg.display_off = mipi_display_off;

	return 0;

	emipisetup:
	mipi_dsi[idx] = NULL;
	clk_disable(mipi->dsip_clk);
	eclkpon:
	clk_disable(mipi->dsit_clk);
	eclkton:
	esetprate:
	clk_put(mipi->dsip_clk);
	eclkpget:
	esettrate:
	clk_put(mipi->dsit_clk);
	eclktget:
	iounmap(mipi->base);
	emap:
	release_mem_region(res->start, resource_size(res));
	ereqreg:
	kfree(mipi);
	ealloc:
	efindslot:
	mutex_unlock(&array_lock);

	return ret;
	}

	static int __exit sh_mipi_remove(struct platform_device *pdev)
	{
	struct sh_mipi_dsi_info *pdata = pdev->dev.platform_data;
	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	struct sh_mipi *mipi = platform_get_drvdata(pdev);
	int i, ret;

	mutex_lock(&array_lock);

	for (i = 0; i < ARRAY_SIZE(mipi_dsi) && mipi_dsi[i] != mipi; i++)
	;

	if (i == ARRAY_SIZE(mipi_dsi)) {
	ret = -EINVAL;
	} else {
	ret = 0;
	mipi_dsi[i] = NULL;
	}

	mutex_unlock(&array_lock);

	if (ret < 0)
	return ret;

	pdata->lcd_chan->board_cfg.display_on = NULL;
	pdata->lcd_chan->board_cfg.display_off = NULL;
	pdata->lcd_chan->board_cfg.board_data = NULL;

	clk_disable(mipi->dsip_clk);
	clk_disable(mipi->dsit_clk);
	clk_put(mipi->dsit_clk);
	clk_put(mipi->dsip_clk);
	iounmap(mipi->base);
	if (res)
	release_mem_region(res->start, resource_size(res));
	platform_set_drvdata(pdev, NULL);
	kfree(mipi);

	return 0;
	}

	static struct platform_driver sh_mipi_driver = {
	.remove = __exit_p(sh_mipi_remove),
	.shutdown = sh_mipi_shutdown,
	.driver = {
	.name = "sh-mipi-dsi",
	},
	};

	static int __init sh_mipi_init(void)
	{
	return platform_driver_probe(&sh_mipi_driver, sh_mipi_probe);
	}
	module_init(sh_mipi_init);

	static void __exit sh_mipi_exit(void)
	{
	platform_driver_unregister(&sh_mipi_driver);
	}
	module_exit(sh_mipi_exit);

	MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
	MODULE_DESCRIPTION("SuperH / ARM-shmobile MIPI DSI driver");
	MODULE_LICENSE("GPL v2");