text: /*
   * Frame Buffer Device for Toshiba Mobile IO(TMIO) controller
   *
   * Copyright(C) 2005-2006 Chris Humbert
   * Copyright(C) 2005 Dirk Opfer
   * Copytight(C) 2007,2008 Dmitry Baryshkov
   *
   * Based on:
   *	drivers/video/w100fb.c
   *	code written by Sharp/Lineo for 2.4 kernels
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2
   * as published by the Free Software Foundation;
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/platform_device.h>
  #include <linux/fb.h>
  #include <linux/interrupt.h>
  #include <linux/delay.h>
  /* Why should fb driver call console functions? because acquire_console_sem() */
  #include <linux/console.h>
  #include <linux/mfd/core.h>
  #include <linux/mfd/tmio.h>
  #include <linux/uaccess.h>
  
  /*
   * accelerator commands
   */
  #define TMIOFB_ACC_CSADR(x)	(0x00000000 | ((x) & 0x001ffffe))
  #define TMIOFB_ACC_CHPIX(x)	(0x01000000 | ((x) & 0x000003ff))
  #define TMIOFB_ACC_CVPIX(x)	(0x02000000 | ((x) & 0x000003ff))
  #define TMIOFB_ACC_PSADR(x)	(0x03000000 | ((x) & 0x00fffffe))
  #define TMIOFB_ACC_PHPIX(x)	(0x04000000 | ((x) & 0x000003ff))
  #define TMIOFB_ACC_PVPIX(x)	(0x05000000 | ((x) & 0x000003ff))
  #define TMIOFB_ACC_PHOFS(x)	(0x06000000 | ((x) & 0x000003ff))
  #define TMIOFB_ACC_PVOFS(x)	(0x07000000 | ((x) & 0x000003ff))
  #define TMIOFB_ACC_POADR(x)	(0x08000000 | ((x) & 0x00fffffe))
  #define TMIOFB_ACC_RSTR(x)	(0x09000000 | ((x) & 0x000000ff))
  #define TMIOFB_ACC_TCLOR(x)	(0x0A000000 | ((x) & 0x0000ffff))
  #define TMIOFB_ACC_FILL(x)	(0x0B000000 | ((x) & 0x0000ffff))
  #define TMIOFB_ACC_DSADR(x)	(0x0C000000 | ((x) & 0x00fffffe))
  #define TMIOFB_ACC_SSADR(x)	(0x0D000000 | ((x) & 0x00fffffe))
  #define TMIOFB_ACC_DHPIX(x)	(0x0E000000 | ((x) & 0x000003ff))
  #define TMIOFB_ACC_DVPIX(x)	(0x0F000000 | ((x) & 0x000003ff))
  #define TMIOFB_ACC_SHPIX(x)	(0x10000000 | ((x) & 0x000003ff))
  #define TMIOFB_ACC_SVPIX(x)	(0x11000000 | ((x) & 0x000003ff))
  #define TMIOFB_ACC_LBINI(x)	(0x12000000 | ((x) & 0x0000ffff))
  #define TMIOFB_ACC_LBK2(x)	(0x13000000 | ((x) & 0x0000ffff))
  #define TMIOFB_ACC_SHBINI(x)	(0x14000000 | ((x) & 0x0000ffff))
  #define TMIOFB_ACC_SHBK2(x)	(0x15000000 | ((x) & 0x0000ffff))
  #define TMIOFB_ACC_SVBINI(x)	(0x16000000 | ((x) & 0x0000ffff))
  #define TMIOFB_ACC_SVBK2(x)	(0x17000000 | ((x) & 0x0000ffff))
  
  #define TMIOFB_ACC_CMGO		0x20000000
  #define TMIOFB_ACC_CMGO_CEND	0x00000001
  #define TMIOFB_ACC_CMGO_INT	0x00000002
  #define TMIOFB_ACC_CMGO_CMOD	0x00000010
  #define TMIOFB_ACC_CMGO_CDVRV	0x00000020
  #define TMIOFB_ACC_CMGO_CDHRV	0x00000040
  #define TMIOFB_ACC_CMGO_RUND	0x00008000
  #define TMIOFB_ACC_SCGO		0x21000000
  #define TMIOFB_ACC_SCGO_CEND	0x00000001
  #define TMIOFB_ACC_SCGO_INT	0x00000002
  #define TMIOFB_ACC_SCGO_ROP3	0x00000004
  #define TMIOFB_ACC_SCGO_TRNS	0x00000008
  #define TMIOFB_ACC_SCGO_DVRV	0x00000010
  #define TMIOFB_ACC_SCGO_DHRV	0x00000020
  #define TMIOFB_ACC_SCGO_SVRV	0x00000040
  #define TMIOFB_ACC_SCGO_SHRV	0x00000080
  #define TMIOFB_ACC_SCGO_DSTXY	0x00008000
  #define TMIOFB_ACC_SBGO		0x22000000
  #define TMIOFB_ACC_SBGO_CEND	0x00000001
  #define TMIOFB_ACC_SBGO_INT	0x00000002
  #define TMIOFB_ACC_SBGO_DVRV	0x00000010
  #define TMIOFB_ACC_SBGO_DHRV	0x00000020
  #define TMIOFB_ACC_SBGO_SVRV	0x00000040
  #define TMIOFB_ACC_SBGO_SHRV	0x00000080
  #define TMIOFB_ACC_SBGO_SBMD	0x00000100
  #define TMIOFB_ACC_FLGO		0x23000000
  #define TMIOFB_ACC_FLGO_CEND	0x00000001
  #define TMIOFB_ACC_FLGO_INT	0x00000002
  #define TMIOFB_ACC_FLGO_ROP3	0x00000004
  #define TMIOFB_ACC_LDGO		0x24000000
  #define TMIOFB_ACC_LDGO_CEND	0x00000001
  #define TMIOFB_ACC_LDGO_INT	0x00000002
  #define TMIOFB_ACC_LDGO_ROP3	0x00000004
  #define TMIOFB_ACC_LDGO_ENDPX	0x00000008
  #define TMIOFB_ACC_LDGO_LVRV	0x00000010
  #define TMIOFB_ACC_LDGO_LHRV	0x00000020
  #define TMIOFB_ACC_LDGO_LDMOD	0x00000040
  
  /* a FIFO is always allocated, even if acceleration is not used */
  #define TMIOFB_FIFO_SIZE	512
  
  /*
   * LCD Host Controller Configuration Register
   *
   * This iomem area supports only 16-bit IO.
   */
  #define CCR_CMD			0x04 /* Command				*/
  #define CCR_REVID		0x08 /* Revision ID			*/
  #define CCR_BASEL		0x10 /* LCD Control Reg Base Addr Low	*/
  #define CCR_BASEH		0x12 /* LCD Control Reg Base Addr High	*/
  #define CCR_UGCC		0x40 /* Unified Gated Clock Control	*/
  #define CCR_GCC			0x42 /* Gated Clock Control		*/
  #define CCR_USC			0x50 /* Unified Software Clear		*/
  #define CCR_VRAMRTC		0x60 /* VRAM Timing Control		*/
  				/* 0x61 VRAM Refresh Control		*/
  #define CCR_VRAMSAC		0x62 /* VRAM Access Control		*/
  				/* 0x63	VRAM Status			*/
  #define CCR_VRAMBC		0x64 /* VRAM Block Control		*/
  
  /*
   * LCD Control Register
   *
   * This iomem area supports only 16-bit IO.
   */
  #define LCR_UIS			0x000 /* Unified Interrupt Status	*/
  #define LCR_VHPN		0x008 /* VRAM Horizontal Pixel Number	*/
  #define LCR_CFSAL		0x00a /* Command FIFO Start Address Low	*/
  #define LCR_CFSAH		0x00c /* Command FIFO Start Address High */
  #define LCR_CFS			0x00e /* Command FIFO Size		*/
  #define LCR_CFWS		0x010 /* Command FIFO Writeable Size	*/
  #define LCR_BBIE		0x012 /* BitBLT Interrupt Enable	*/
  #define LCR_BBISC		0x014 /* BitBLT Interrupt Status and Clear */
  #define LCR_CCS			0x016 /* Command Count Status		*/
  #define LCR_BBES		0x018 /* BitBLT Execution Status	*/
  #define LCR_CMDL		0x01c /* Command Low			*/
  #define LCR_CMDH		0x01e /* Command High			*/
  #define LCR_CFC			0x022 /* Command FIFO Clear		*/
  #define LCR_CCIFC		0x024 /* CMOS Camera IF Control		*/
  #define LCR_HWT			0x026 /* Hardware Test			*/
  #define LCR_LCDCCRC		0x100 /* LCDC Clock and Reset Control	*/
  #define LCR_LCDCC		0x102 /* LCDC Control			*/
  #define LCR_LCDCOPC		0x104 /* LCDC Output Pin Control	*/
  #define LCR_LCDIS		0x108 /* LCD Interrupt Status		*/
  #define LCR_LCDIM		0x10a /* LCD Interrupt Mask		*/
  #define LCR_LCDIE		0x10c /* LCD Interrupt Enable		*/
  #define LCR_GDSAL		0x122 /* Graphics Display Start Address Low */
  #define LCR_GDSAH		0x124 /* Graphics Display Start Address High */
  #define LCR_VHPCL		0x12a /* VRAM Horizontal Pixel Count Low */
  #define LCR_VHPCH		0x12c /* VRAM Horizontal Pixel Count High */
  #define LCR_GM			0x12e /* Graphic Mode(VRAM access enable) */
  #define LCR_HT			0x140 /* Horizontal Total		*/
  #define LCR_HDS			0x142 /* Horizontal Display Start	*/
  #define LCR_HSS			0x144 /* H-Sync Start			*/
  #define LCR_HSE			0x146 /* H-Sync End			*/
  #define LCR_HNP			0x14c /* Horizontal Number of Pixels	*/
  #define LCR_VT			0x150 /* Vertical Total			*/
  #define LCR_VDS			0x152 /* Vertical Display Start		*/
  #define LCR_VSS			0x154 /* V-Sync Start			*/
  #define LCR_VSE			0x156 /* V-Sync End			*/
  #define LCR_CDLN		0x160 /* Current Display Line Number	*/
  #define LCR_ILN			0x162 /* Interrupt Line Number		*/
  #define LCR_SP			0x164 /* Sync Polarity			*/
  #define LCR_MISC		0x166 /* MISC(RGB565 mode)		*/
  #define LCR_VIHSS		0x16a /* Video Interface H-Sync Start	*/
  #define LCR_VIVS		0x16c /* Video Interface Vertical Start	*/
  #define LCR_VIVE		0x16e /* Video Interface Vertical End	*/
  #define LCR_VIVSS		0x170 /* Video Interface V-Sync Start	*/
  #define LCR_VCCIS		0x17e /* Video / CMOS Camera Interface Select */
  #define LCR_VIDWSAL		0x180 /* VI Data Write Start Address Low */
  #define LCR_VIDWSAH		0x182 /* VI Data Write Start Address High */
  #define LCR_VIDRSAL		0x184 /* VI Data Read Start Address Low	*/
  #define LCR_VIDRSAH		0x186 /* VI Data Read Start Address High */
  #define LCR_VIPDDST		0x188 /* VI Picture Data Display Start Timing */
  #define LCR_VIPDDET		0x186 /* VI Picture Data Display End Timing */
  #define LCR_VIE			0x18c /* Video Interface Enable		*/
  #define LCR_VCS			0x18e /* Video/Camera Select		*/
  #define LCR_VPHWC		0x194 /* Video Picture Horizontal Wait Count */
  #define LCR_VPHS		0x196 /* Video Picture Horizontal Size	*/
  #define LCR_VPVWC		0x198 /* Video Picture Vertical Wait Count */
  #define LCR_VPVS		0x19a /* Video Picture Vertical Size	*/
  #define LCR_PLHPIX		0x1a0 /* PLHPIX				*/
  #define LCR_XS			0x1a2 /* XStart				*/
  #define LCR_XCKHW		0x1a4 /* XCK High Width			*/
  #define LCR_STHS		0x1a8 /* STH Start			*/
  #define LCR_VT2			0x1aa /* Vertical Total			*/
  #define LCR_YCKSW		0x1ac /* YCK Start Wait			*/
  #define LCR_YSTS		0x1ae /* YST Start			*/
  #define LCR_PPOLS		0x1b0 /* #PPOL Start			*/
  #define LCR_PRECW		0x1b2 /* PREC Width			*/
  #define LCR_VCLKHW		0x1b4 /* VCLK High Width		*/
  #define LCR_OC			0x1b6 /* Output Control			*/
  
  static char *mode_option __devinitdata;
  
  struct tmiofb_par {
  	u32				pseudo_palette[16];
  
  #ifdef CONFIG_FB_TMIO_ACCELL
  	wait_queue_head_t		wait_acc;
  	bool				use_polling;
  #endif
  
  	void __iomem			*ccr;
  	void __iomem			*lcr;
  };
  
  /*--------------------------------------------------------------------------*/
  
  /*
   * reasons for an interrupt:
   *	uis	bbisc	lcdis
   *	0100	0001	accelerator command completed
   * 	2000	0001	vsync start
   * 	2000	0002	display start
   * 	2000	0004	line number match(0x1ff mask???)
   */
  static irqreturn_t tmiofb_irq(int irq, void *__info)
  {
  	struct fb_info *info = __info;
  	struct tmiofb_par *par = info->par;
  	unsigned int bbisc = tmio_ioread16(par->lcr + LCR_BBISC);
  
  
  	tmio_iowrite16(bbisc, par->lcr + LCR_BBISC);
  
  #ifdef CONFIG_FB_TMIO_ACCELL
  	/*
  	 * We were in polling mode and now we got correct irq.
  	 * Switch back to IRQ-based sync of command FIFO
  	 */
  	if (unlikely(par->use_polling && irq != -1)) {
  		printk(KERN_INFO "tmiofb: switching to waitq\n");
  		par->use_polling = false;
  	}
  
  	if (bbisc & 1)
  		wake_up(&par->wait_acc);
  #endif
  
  	return IRQ_HANDLED;
  }
  
  
  /*--------------------------------------------------------------------------*/
  
  
  /*
   * Turns off the LCD controller and LCD host controller.
   */
  static int tmiofb_hw_stop(struct platform_device *dev)
  {
  	struct mfd_cell *cell = dev->dev.platform_data;
  	struct tmio_fb_data *data = cell->driver_data;
  	struct fb_info *info = platform_get_drvdata(dev);
  	struct tmiofb_par *par = info->par;
  
  	tmio_iowrite16(0, par->ccr + CCR_UGCC);
  	tmio_iowrite16(0, par->lcr + LCR_GM);
  	data->lcd_set_power(dev, 0);
  	tmio_iowrite16(0x0010, par->lcr + LCR_LCDCCRC);
  
  	return 0;
  }
  
  /*
   * Initializes the LCD host controller.
   */
  static int tmiofb_hw_init(struct platform_device *dev)
  {
  	struct mfd_cell *cell = dev->dev.platform_data;
  	struct fb_info *info = platform_get_drvdata(dev);
  	struct tmiofb_par *par = info->par;
  	const struct resource *nlcr = &cell->resources[0];
  	const struct resource *vram = &cell->resources[2];
  	unsigned long base;
  
  	if (nlcr == NULL || vram == NULL)
  		return -EINVAL;
  
  	base = nlcr->start;
  
  	tmio_iowrite16(0x003a, par->ccr + CCR_UGCC);
  	tmio_iowrite16(0x003a, par->ccr + CCR_GCC);
  	tmio_iowrite16(0x3f00, par->ccr + CCR_USC);
  
  	msleep(2); /* wait for device to settle */
  
  	tmio_iowrite16(0x0000, par->ccr + CCR_USC);
  	tmio_iowrite16(base >> 16, par->ccr + CCR_BASEH);
  	tmio_iowrite16(base, par->ccr + CCR_BASEL);
  	tmio_iowrite16(0x0002, par->ccr + CCR_CMD); /* base address enable */
  	tmio_iowrite16(0x40a8, par->ccr + CCR_VRAMRTC); /* VRAMRC, VRAMTC */
  	tmio_iowrite16(0x0018, par->ccr + CCR_VRAMSAC); /* VRAMSTS, VRAMAC */
  	tmio_iowrite16(0x0002, par->ccr + CCR_VRAMBC);
  	msleep(2); /* wait for device to settle */
  	tmio_iowrite16(0x000b, par->ccr + CCR_VRAMBC);
  
  	base = vram->start + info->screen_size;
  	tmio_iowrite16(base >> 16, par->lcr + LCR_CFSAH);
  	tmio_iowrite16(base, par->lcr + LCR_CFSAL);
  	tmio_iowrite16(TMIOFB_FIFO_SIZE - 1, par->lcr + LCR_CFS);
  	tmio_iowrite16(1, par->lcr + LCR_CFC);
  	tmio_iowrite16(1, par->lcr + LCR_BBIE);
  	tmio_iowrite16(0, par->lcr + LCR_CFWS);
  
  	return 0;
  }
  
  /*
   * Sets the LCD controller's output resolution and pixel clock
   */
  static void tmiofb_hw_mode(struct platform_device *dev)
  {
  	struct mfd_cell *cell = dev->dev.platform_data;
  	struct tmio_fb_data *data = cell->driver_data;
  	struct fb_info *info = platform_get_drvdata(dev);
  	struct fb_videomode *mode = info->mode;
  	struct tmiofb_par *par = info->par;
  	unsigned int i;
  
  	tmio_iowrite16(0, par->lcr + LCR_GM);
  	data->lcd_set_power(dev, 0);
  	tmio_iowrite16(0x0010, par->lcr + LCR_LCDCCRC);
  	data->lcd_mode(dev, mode);
  	data->lcd_set_power(dev, 1);
  
  	tmio_iowrite16(info->fix.line_length, par->lcr + LCR_VHPN);
  	tmio_iowrite16(0, par->lcr + LCR_GDSAH);
  	tmio_iowrite16(0, par->lcr + LCR_GDSAL);
  	tmio_iowrite16(info->fix.line_length >> 16, par->lcr + LCR_VHPCH);
  	tmio_iowrite16(info->fix.line_length, par->lcr + LCR_VHPCL);
  	tmio_iowrite16(i = 0, par->lcr + LCR_HSS);
  	tmio_iowrite16(i += mode->hsync_len, par->lcr + LCR_HSE);
  	tmio_iowrite16(i += mode->left_margin, par->lcr + LCR_HDS);
  	tmio_iowrite16(i += mode->xres + mode->right_margin, par->lcr + LCR_HT);
  	tmio_iowrite16(mode->xres, par->lcr + LCR_HNP);
  	tmio_iowrite16(i = 0, par->lcr + LCR_VSS);
  	tmio_iowrite16(i += mode->vsync_len, par->lcr + LCR_VSE);
  	tmio_iowrite16(i += mode->upper_margin, par->lcr + LCR_VDS);
  	tmio_iowrite16(i += mode->yres, par->lcr + LCR_ILN);
  	tmio_iowrite16(i += mode->lower_margin, par->lcr + LCR_VT);
  	tmio_iowrite16(3, par->lcr + LCR_MISC); /* RGB565 mode */
  	tmio_iowrite16(1, par->lcr + LCR_GM); /* VRAM enable */
  	tmio_iowrite16(0x4007, par->lcr + LCR_LCDCC);
  	tmio_iowrite16(3, par->lcr + LCR_SP);  /* sync polarity */
  
  	tmio_iowrite16(0x0010, par->lcr + LCR_LCDCCRC);
  	msleep(5); /* wait for device to settle */
  	tmio_iowrite16(0x0014, par->lcr + LCR_LCDCCRC); /* STOP_CKP */
  	msleep(5); /* wait for device to settle */
  	tmio_iowrite16(0x0015, par->lcr + LCR_LCDCCRC); /* STOP_CKP|SOFT_RESET*/
  	tmio_iowrite16(0xfffa, par->lcr + LCR_VCS);
  }
  
  /*--------------------------------------------------------------------------*/
  
  #ifdef CONFIG_FB_TMIO_ACCELL
  static int __must_check
  tmiofb_acc_wait(struct fb_info *info, unsigned int ccs)
  {
  	struct tmiofb_par *par = info->par;
  	/*
  	 * This code can be called whith interrupts disabled.
  	 * So instead of relaying on irq to trigger the event,
  	 * poll the state till the necessary command is executed.
  	 */
  	if (irqs_disabled() || par->use_polling) {
  		int i = 0;
  		while (tmio_ioread16(par->lcr + LCR_CCS) > ccs) {
  			udelay(1);
  			i++;
  			if (i > 10000) {
  				pr_err("tmiofb: timeout waiting for %d\n",
  						ccs);
  				return -ETIMEDOUT;
  			}
  			tmiofb_irq(-1, info);
  		}
  	} else {
  		if (!wait_event_interruptible_timeout(par->wait_acc,
  				tmio_ioread16(par->lcr + LCR_CCS) <= ccs,
  				1000)) {
  			pr_err("tmiofb: timeout waiting for %d\n", ccs);
  			return -ETIMEDOUT;
  		}
  	}
  
  	return 0;
  }
  
  /*
   * Writes an accelerator command to the accelerator's FIFO.
   */
  static int
  tmiofb_acc_write(struct fb_info *info, const u32 *cmd, unsigned int count)
  {
  	struct tmiofb_par *par = info->par;
  	int ret;
  
  	ret = tmiofb_acc_wait(info, TMIOFB_FIFO_SIZE - count);
  	if (ret)
  		return ret;
  
  	for (; count; count--, cmd++) {
  		tmio_iowrite16(*cmd >> 16, par->lcr + LCR_CMDH);
  		tmio_iowrite16(*cmd, par->lcr + LCR_CMDL);
  	}
  
  	return ret;
  }
  
  /*
   * Wait for the accelerator to finish its operations before writing
   * to the framebuffer for consistent display output.
   */
  static int tmiofb_sync(struct fb_info *fbi)
  {
  	struct tmiofb_par *par = fbi->par;
  
  	int ret;
  	int i = 0;
  
  	ret = tmiofb_acc_wait(fbi, 0);
  
  	while (tmio_ioread16(par->lcr + LCR_BBES) & 2) { /* blit active */
  		udelay(1);
  		i++ ;
  		if (i > 10000) {
  			printk(KERN_ERR "timeout waiting for blit to end!\n");
  			return -ETIMEDOUT;
  		}
  	}
  
  	return ret;
  }
  
  static void
  tmiofb_fillrect(struct fb_info *fbi, const struct fb_fillrect *rect)
  {
  	const u32 cmd[] = {
  		TMIOFB_ACC_DSADR((rect->dy * fbi->mode->xres + rect->dx) * 2),
  		TMIOFB_ACC_DHPIX(rect->width - 1),
  		TMIOFB_ACC_DVPIX(rect->height - 1),
  		TMIOFB_ACC_FILL(rect->color),
  		TMIOFB_ACC_FLGO,
  	};
  
  	if (fbi->state != FBINFO_STATE_RUNNING ||
  	    fbi->flags & FBINFO_HWACCEL_DISABLED) {
  		cfb_fillrect(fbi, rect);
  		return;
  	}
  
  	tmiofb_acc_write(fbi, cmd, ARRAY_SIZE(cmd));
  }
  
  static void
  tmiofb_copyarea(struct fb_info *fbi, const struct fb_copyarea *area)
  {
  	const u32 cmd[] = {
  		TMIOFB_ACC_DSADR((area->dy * fbi->mode->xres + area->dx) * 2),
  		TMIOFB_ACC_DHPIX(area->width - 1),
  		TMIOFB_ACC_DVPIX(area->height - 1),
  		TMIOFB_ACC_SSADR((area->sy * fbi->mode->xres + area->sx) * 2),
  		TMIOFB_ACC_SCGO,
  	};
  
  	if (fbi->state != FBINFO_STATE_RUNNING ||
  	    fbi->flags & FBINFO_HWACCEL_DISABLED) {
  		cfb_copyarea(fbi, area);
  		return;
  	}
  
  	tmiofb_acc_write(fbi, cmd, ARRAY_SIZE(cmd));
  }
  #endif
  
  static void tmiofb_clearscreen(struct fb_info *info)
  {
  	const struct fb_fillrect rect = {
  		.dx	= 0,
  		.dy	= 0,
  		.width	= info->mode->xres,
  		.height	= info->mode->yres,
  		.color	= 0,
  		.rop	= ROP_COPY,
  	};
  
  	info->fbops->fb_fillrect(info, &rect);
  }
  
  static int tmiofb_vblank(struct fb_info *fbi, struct fb_vblank *vblank)
  {
  	struct tmiofb_par *par = fbi->par;
  	struct fb_videomode *mode = fbi->mode;
  	unsigned int vcount = tmio_ioread16(par->lcr + LCR_CDLN);
  	unsigned int vds = mode->vsync_len + mode->upper_margin;
  
  	vblank->vcount = vcount;
  	vblank->flags = FB_VBLANK_HAVE_VBLANK | FB_VBLANK_HAVE_VCOUNT
  						| FB_VBLANK_HAVE_VSYNC;
  
  	if (vcount < mode->vsync_len)
  		vblank->flags |= FB_VBLANK_VSYNCING;
  
  	if (vcount < vds || vcount > vds + mode->yres)
  		vblank->flags |= FB_VBLANK_VBLANKING;
  
  	return 0;
  }
  
  
  static int tmiofb_ioctl(struct fb_info *fbi,
  		unsigned int cmd, unsigned long arg)
  {
  	switch (cmd) {
  	case FBIOGET_VBLANK: {
  		struct fb_vblank vblank = {0};
  		void __user *argp = (void __user *) arg;
  
  		tmiofb_vblank(fbi, &vblank);
  		if (copy_to_user(argp, &vblank, sizeof vblank))
  			return -EFAULT;
  		return 0;
  	}
  
  #ifdef CONFIG_FB_TMIO_ACCELL
  	case FBIO_TMIO_ACC_SYNC:
  		tmiofb_sync(fbi);
  		return 0;
  
  	case FBIO_TMIO_ACC_WRITE: {
  		u32 __user *argp = (void __user *) arg;
  		u32 len;
  		u32 acc[16];
  
  		if (get_user(len, argp))
  			return -EFAULT;
  		if (len > ARRAY_SIZE(acc))
  			return -EINVAL;
  		if (copy_from_user(acc, argp + 1, sizeof(u32) * len))
  			return -EFAULT;
  
  		return tmiofb_acc_write(fbi, acc, len);
  	}
  #endif
  	}
  
  	return -ENOTTY;
  }
  
  /*--------------------------------------------------------------------------*/
  
  /* Select the smallest mode that allows the desired resolution to be
   * displayed.  If desired, the x and y parameters can be rounded up to
   * match the selected mode.
   */
  static struct fb_videomode *
  tmiofb_find_mode(struct fb_info *info, struct fb_var_screeninfo *var)
  {
  	struct mfd_cell *cell =
  		info->device->platform_data;
  	struct tmio_fb_data *data = cell->driver_data;
  	struct fb_videomode *best = NULL;
  	int i;
  
  	for (i = 0; i < data->num_modes; i++) {
  		struct fb_videomode *mode = data->modes + i;
  
  		if (mode->xres >= var->xres && mode->yres >= var->yres
  				&& (!best || (mode->xres < best->xres
  					   && mode->yres < best->yres)))
  			best = mode;
  	}
  
  	return best;
  }
  
  static int tmiofb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
  {
  
  	struct fb_videomode *mode;
  	struct mfd_cell *cell =
  		info->device->platform_data;
  	struct tmio_fb_data *data = cell->driver_data;
  
  	mode = tmiofb_find_mode(info, var);
  	if (!mode || var->bits_per_pixel > 16)
  		return -EINVAL;
  
  	fb_videomode_to_var(var, mode);
  
  	var->xres_virtual = mode->xres;
  	var->yres_virtual = info->screen_size / (mode->xres * 2);
  
  	if (var->yres_virtual < var->yres)
  		return -EINVAL;
  
  	var->xoffset = 0;
  	var->yoffset = 0;
  	var->bits_per_pixel = 16;
  	var->grayscale = 0;
  	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;
  	var->nonstd = 0;
  	var->height = data->height; /* mm */
  	var->width = data->width; /* mm */
  	var->rotate = 0;
  	return 0;
  }
  
  static int tmiofb_set_par(struct fb_info *info)
  {
  	struct fb_var_screeninfo *var = &info->var;
  	struct fb_videomode *mode;
  
  	mode = tmiofb_find_mode(info, var);
  	if (!mode)
  		return -EINVAL;
  
  	info->mode = mode;
  	info->fix.line_length = info->mode->xres *
  			var->bits_per_pixel / 8;
  
  	tmiofb_hw_mode(to_platform_device(info->device));
  	tmiofb_clearscreen(info);
  	return 0;
  }
  
  static int tmiofb_setcolreg(unsigned regno, unsigned red, unsigned green,
  			   unsigned blue, unsigned transp,
  			   struct fb_info *info)
  {
  	struct tmiofb_par *par = info->par;
  
  	if (regno < ARRAY_SIZE(par->pseudo_palette)) {
  		par->pseudo_palette[regno] =
  			((red & 0xf800)) |
  			((green & 0xfc00) >>  5) |
  			((blue & 0xf800) >> 11);
  		return 0;
  	}
  
  	return -EINVAL;
  }
  
  static int tmiofb_blank(int blank, struct fb_info *info)
  {
  	/*
  	 * everything is done in lcd/bl drivers.
  	 * this is purely to make sysfs happy and work.
  	 */
  	return 0;
  }
  
  static struct fb_ops tmiofb_ops = {
  	.owner		= THIS_MODULE,
  
  	.fb_ioctl	= tmiofb_ioctl,
  	.fb_check_var	= tmiofb_check_var,
  	.fb_set_par	= tmiofb_set_par,
  	.fb_setcolreg	= tmiofb_setcolreg,
  	.fb_blank	= tmiofb_blank,
  	.fb_imageblit	= cfb_imageblit,
  #ifdef CONFIG_FB_TMIO_ACCELL
  	.fb_sync	= tmiofb_sync,
  	.fb_fillrect	= tmiofb_fillrect,
  	.fb_copyarea	= tmiofb_copyarea,
  #else
  	.fb_fillrect	= cfb_fillrect,
  	.fb_copyarea	= cfb_copyarea,
  #endif
  };
  
  /*--------------------------------------------------------------------------*/
  
  static int __devinit tmiofb_probe(struct platform_device *dev)
  {
  	struct mfd_cell *cell = dev->dev.platform_data;
  	struct tmio_fb_data *data = cell->driver_data;
  	struct resource *ccr = platform_get_resource(dev, IORESOURCE_MEM, 1);
  	struct resource *lcr = platform_get_resource(dev, IORESOURCE_MEM, 0);
  	struct resource *vram = platform_get_resource(dev, IORESOURCE_MEM, 2);
  	int irq = platform_get_irq(dev, 0);
  	struct fb_info *info;
  	struct tmiofb_par *par;
  	int retval;
  
  	/*
  	 * This is the only way ATM to disable the fb
  	 */
  	if (data == NULL) {
  		dev_err(&dev->dev, "NULL platform data!\n");
  		return -EINVAL;
  	}
  
  	info = framebuffer_alloc(sizeof(struct tmiofb_par), &dev->dev);
  
  	if (!info)
  		return -ENOMEM;
  
  	par = info->par;
  
  #ifdef CONFIG_FB_TMIO_ACCELL
  	init_waitqueue_head(&par->wait_acc);
  
  	par->use_polling = true;
  
  	info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA
  			| FBINFO_HWACCEL_FILLRECT;
  #else
  	info->flags = FBINFO_DEFAULT;
  #endif
  
  	info->fbops = &tmiofb_ops;
  
  	strcpy(info->fix.id, "tmio-fb");
  	info->fix.smem_start = vram->start;
  	info->fix.smem_len = resource_size(vram);
  	info->fix.type = FB_TYPE_PACKED_PIXELS;
  	info->fix.visual = FB_VISUAL_TRUECOLOR;
  	info->fix.mmio_start = lcr->start;
  	info->fix.mmio_len = resource_size(lcr);
  	info->fix.accel = FB_ACCEL_NONE;
  	info->screen_size = info->fix.smem_len - (4 * TMIOFB_FIFO_SIZE);
  	info->pseudo_palette = par->pseudo_palette;
  
  	par->ccr = ioremap(ccr->start, resource_size(ccr));
  	if (!par->ccr) {
  		retval = -ENOMEM;
  		goto err_ioremap_ccr;
  	}
  
  	par->lcr = ioremap(info->fix.mmio_start, info->fix.mmio_len);
  	if (!par->lcr) {
  		retval = -ENOMEM;
  		goto err_ioremap_lcr;
  	}
  
  	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
  	if (!info->screen_base) {
  		retval = -ENOMEM;
  		goto err_ioremap_vram;
  	}
  
  	retval = request_irq(irq, &tmiofb_irq, IRQF_DISABLED,
  					dev_name(&dev->dev), info);
  
  	if (retval)
  		goto err_request_irq;
  
  	platform_set_drvdata(dev, info);
  
  	retval = fb_find_mode(&info->var, info, mode_option,
  			data->modes, data->num_modes,
  			data->modes, 16);
  	if (!retval) {
  		retval = -EINVAL;
  		goto err_find_mode;
  	}
  
  	if (cell->enable) {
  		retval = cell->enable(dev);
  		if (retval)
  			goto err_enable;
  	}
  
  	retval = tmiofb_hw_init(dev);
  	if (retval)
  		goto err_hw_init;
  
  	fb_videomode_to_modelist(data->modes, data->num_modes,
  				 &info->modelist);
  
  	retval = register_framebuffer(info);
  	if (retval < 0)
  		goto err_register_framebuffer;
  
  	printk(KERN_INFO "fb%d: %s frame buffer device\n",
  				info->node, info->fix.id);
  
  	return 0;
  
  err_register_framebuffer:
  /*err_set_par:*/
  	tmiofb_hw_stop(dev);
  err_hw_init:
  	if (cell->disable)
  		cell->disable(dev);
  err_enable:
  err_find_mode:
  	platform_set_drvdata(dev, NULL);
  	free_irq(irq, info);
  err_request_irq:
  	iounmap(info->screen_base);
  err_ioremap_vram:
  	iounmap(par->lcr);
  err_ioremap_lcr:
  	iounmap(par->ccr);
  err_ioremap_ccr:
  	framebuffer_release(info);
  	return retval;
  }
  
  static int __devexit tmiofb_remove(struct platform_device *dev)
  {
  	struct mfd_cell *cell = dev->dev.platform_data;
  	struct fb_info *info = platform_get_drvdata(dev);
  	int irq = platform_get_irq(dev, 0);
  	struct tmiofb_par *par;
  
  	if (info) {
  		par = info->par;
  		unregister_framebuffer(info);
  
  		tmiofb_hw_stop(dev);
  
  		if (cell->disable)
  			cell->disable(dev);
  
  		platform_set_drvdata(dev, NULL);
  
  		free_irq(irq, info);
  
  		iounmap(info->screen_base);
  		iounmap(par->lcr);
  		iounmap(par->ccr);
  
  		framebuffer_release(info);
  	}
  
  	return 0;
  }
  
  #ifdef DEBUG
  static void tmiofb_dump_regs(struct platform_device *dev)
  {
  	struct fb_info *info = platform_get_drvdata(dev);
  	struct tmiofb_par *par = info->par;
  
  	printk(KERN_DEBUG "lhccr:\n");
  #define CCR_PR(n)	printk(KERN_DEBUG "\t" #n " = \t%04x\n",\
  		tmio_ioread16(par->ccr + CCR_ ## n));
  	CCR_PR(CMD);
  	CCR_PR(REVID);
  	CCR_PR(BASEL);
  	CCR_PR(BASEH);
  	CCR_PR(UGCC);
  	CCR_PR(GCC);
  	CCR_PR(USC);
  	CCR_PR(VRAMRTC);
  	CCR_PR(VRAMSAC);
  	CCR_PR(VRAMBC);
  #undef CCR_PR
  
  	printk(KERN_DEBUG "lcr: \n");
  #define LCR_PR(n)	printk(KERN_DEBUG "\t" #n " = \t%04x\n",\
  		tmio_ioread16(par->lcr + LCR_ ## n));
  	LCR_PR(UIS);
  	LCR_PR(VHPN);
  	LCR_PR(CFSAL);
  	LCR_PR(CFSAH);
  	LCR_PR(CFS);
  	LCR_PR(CFWS);
  	LCR_PR(BBIE);
  	LCR_PR(BBISC);
  	LCR_PR(CCS);
  	LCR_PR(BBES);
  	LCR_PR(CMDL);
  	LCR_PR(CMDH);
  	LCR_PR(CFC);
  	LCR_PR(CCIFC);
  	LCR_PR(HWT);
  	LCR_PR(LCDCCRC);
  	LCR_PR(LCDCC);
  	LCR_PR(LCDCOPC);
  	LCR_PR(LCDIS);
  	LCR_PR(LCDIM);
  	LCR_PR(LCDIE);
  	LCR_PR(GDSAL);
  	LCR_PR(GDSAH);
  	LCR_PR(VHPCL);
  	LCR_PR(VHPCH);
  	LCR_PR(GM);
  	LCR_PR(HT);
  	LCR_PR(HDS);
  	LCR_PR(HSS);
  	LCR_PR(HSE);
  	LCR_PR(HNP);
  	LCR_PR(VT);
  	LCR_PR(VDS);
  	LCR_PR(VSS);
  	LCR_PR(VSE);
  	LCR_PR(CDLN);
  	LCR_PR(ILN);
  	LCR_PR(SP);
  	LCR_PR(MISC);
  	LCR_PR(VIHSS);
  	LCR_PR(VIVS);
  	LCR_PR(VIVE);
  	LCR_PR(VIVSS);
  	LCR_PR(VCCIS);
  	LCR_PR(VIDWSAL);
  	LCR_PR(VIDWSAH);
  	LCR_PR(VIDRSAL);
  	LCR_PR(VIDRSAH);
  	LCR_PR(VIPDDST);
  	LCR_PR(VIPDDET);
  	LCR_PR(VIE);
  	LCR_PR(VCS);
  	LCR_PR(VPHWC);
  	LCR_PR(VPHS);
  	LCR_PR(VPVWC);
  	LCR_PR(VPVS);
  	LCR_PR(PLHPIX);
  	LCR_PR(XS);
  	LCR_PR(XCKHW);
  	LCR_PR(STHS);
  	LCR_PR(VT2);
  	LCR_PR(YCKSW);
  	LCR_PR(YSTS);
  	LCR_PR(PPOLS);
  	LCR_PR(PRECW);
  	LCR_PR(VCLKHW);
  	LCR_PR(OC);
  #undef LCR_PR
  }
  #endif
  
  #ifdef CONFIG_PM
  static int tmiofb_suspend(struct platform_device *dev, pm_message_t state)
  {
  	struct fb_info *info = platform_get_drvdata(dev);
  #ifdef CONFIG_FB_TMIO_ACCELL
  	struct tmiofb_par *par = info->par;
  #endif
  	struct mfd_cell *cell = dev->dev.platform_data;
  	int retval = 0;
  
  	acquire_console_sem();
  
  	fb_set_suspend(info, 1);
  
  	if (info->fbops->fb_sync)
  		info->fbops->fb_sync(info);
  
  
  #ifdef CONFIG_FB_TMIO_ACCELL
  	/*
  	 * The fb should be usable even if interrupts are disabled (and they are
  	 * during suspend/resume). Switch temporary to forced polling.
  	 */
  	printk(KERN_INFO "tmiofb: switching to polling\n");
  	par->use_polling = true;
  #endif
  	tmiofb_hw_stop(dev);
  
  	if (cell->suspend)
  		retval = cell->suspend(dev);
  
  	release_console_sem();
  
  	return retval;
  }
  
  static int tmiofb_resume(struct platform_device *dev)
  {
  	struct fb_info *info = platform_get_drvdata(dev);
  	struct mfd_cell *cell = dev->dev.platform_data;
  	int retval = 0;
  
  	acquire_console_sem();
  
  	if (cell->resume) {
  		retval = cell->resume(dev);
  		if (retval)
  			goto out;
  	}
  
  	tmiofb_irq(-1, info);
  
  	tmiofb_hw_init(dev);
  
  	tmiofb_hw_mode(dev);
  
  	fb_set_suspend(info, 0);
  out:
  	release_console_sem();
  	return retval;
  }
  #else
  #define tmiofb_suspend	NULL
  #define tmiofb_resume	NULL
  #endif
  
  static struct platform_driver tmiofb_driver = {
  	.driver.name	= "tmio-fb",
  	.driver.owner	= THIS_MODULE,
  	.probe		= tmiofb_probe,
  	.remove		= __devexit_p(tmiofb_remove),
  	.suspend	= tmiofb_suspend,
  	.resume		= tmiofb_resume,
  };
  
  /*--------------------------------------------------------------------------*/
  
  #ifndef MODULE
  static void __init tmiofb_setup(char *options)
  {
  	char *this_opt;
  
  	if (!options || !*options)
  		return;
  
  	while ((this_opt = strsep(&options, ",")) != NULL) {
  		if (!*this_opt)
  			continue;
  	}
  }
  #endif
  
  static int __init tmiofb_init(void)
  {
  #ifndef MODULE
  	char *option = NULL;
  
  	if (fb_get_options("tmiofb", &option))
  		return -ENODEV;
  	tmiofb_setup(option);
  #endif
  	return platform_driver_register(&tmiofb_driver);
  }
  
  static void __exit tmiofb_cleanup(void)
  {
  	platform_driver_unregister(&tmiofb_driver);
  }
  
  module_init(tmiofb_init);
  module_exit(tmiofb_cleanup);
  
  MODULE_DESCRIPTION("TMIO framebuffer driver");
  MODULE_AUTHOR("Chris Humbert, Dirk Opfer, Dmitry Baryshkov");
  MODULE_LICENSE("GPL");
  