sa1100fb.c

S3C44B0X下的LCD （framebuffer）驱动资料与相关代码

/*
 *  linux/drivers/video/sa1100fb.c
 *
 *  Copyright (C) 1999 Eric A. Thomas
 *   Based on acornfb.c Copyright (C) Russell King.
 *
 * 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.
 *
 *	        StrongARM 1100 LCD Controller Frame Buffer Driver
 *
 * Please direct your questions and comments on this driver to the following
 * email address:
 *
 *	[e-mail]
 *
 * Clean patches should be sent to the ARM Linux Patch System.  Please see the
 * following web page for more information:
 *
 *	http://www.arm.linux.org.uk/developer/patches/info.shtml
 *
 * Thank you.
 *
 * Known problems:
 *  - With the Neponset plugged into an Assabet, LCD powerdown
 *    doesn't work (LCD stays powered up).  Therefore we shouldn't
 *    blank the screen.
 *  - We don't limit the CPU clock rate nor the mode selection
 *    according to the available SDRAM bandwidth.
 *
 * Other notes:
 *	- Linear grayscale palettes and the kernel.
 *	  Such code does not belong in the kernel.  The kernel frame buffer
 *	  drivers do not expect a linear colourmap, but a colourmap based on
 *	  the VT100 standard mapping.
 *
 *	  If your _userspace_ requires a linear colourmap, then the setup of
 *	  such a colourmap belongs _in userspace_, not in the kernel.  Code
 *	  to set the colourmap correctly from user space has been sent to
 *	  David Neuer.  It's around 8 lines of C code, plus another 4 to
 *	  detect if we are using grayscale.
 *
 * Code Status:
 * 1999/04/01:
 *	- Driver appears to be working for Brutus 320x200x8bpp mode.  Other
 *	  resolutions are working, but only the 8bpp mode is supported.
 *	  Changes need to be made to the palette encode and decode routines
 *	  to support 4 and 16 bpp modes.  
 *	  Driver is not designed to be a module.  The FrameBuffer is statically
 *	  allocated since dynamic allocation of a 300k buffer cannot be 
 *	  guaranteed. 
 *
 * 1999/06/17:
 *	- FrameBuffer memory is now allocated at run-time when the
 *	  driver is initialized.    
 *
 * 2000/04/10: Nicolas Pitre <[e-mail]>
 *	- Big cleanup for dynamic selection of machine type at run time.
 *
 * 2000/07/19: Jamey Hicks <[e-mail]>
 *	- Support for Bitsy aka Compaq iPAQ H3600 added.
 *
 * 2000/08/07: Tak-Shing Chan <[e-mail]>
 *	       Jeff Sutherland <[e-mail]>
 *	- Resolved an issue caused by a change made to the Assabet's PLD 
 *	  earlier this year which broke the framebuffer driver for newer 
 *	  Phase 4 Assabets.  Some other parameters were changed to optimize
 *	  for the Sharp display.
 *
 * 2000/08/09: Kunihiko IMAI <[e-mail]>
 *	- XP860 support added
 *
 * 2000/08/19: Mark Huang <[e-mail]>
 *	- Allows standard options to be passed on the kernel command line
 *	  for most common passive displays.
 *
 * 2000/08/29:
 *	- s/save_flags_cli/local_irq_save/
 *	- remove unneeded extra save_flags_cli in sa1100fb_enable_lcd_controller
 *
 * 2000/10/10: Erik Mouw <[e-mail]>
 *	- Updated LART stuff. Fixed some minor bugs.
 *
 * 2000/10/30: Murphy Chen <[e-mail]>
 *	- Pangolin support added
 *
 * 2000/10/31: Roman Jordan <[e-mail]>
 *	- Huw Webpanel support added
 *
 * 2000/11/23: Eric Peng <[e-mail]>
 *	- Freebird add
 *
 * 2001/02/07: Jamey Hicks <[e-mail]> 
 *	       Cliff Brake <[e-mail]>
 *	- Added PM callback
 *
 * 2001/05/26: <[e-mail]>
 *	- Fix 16bpp so that (a) we use the right colours rather than some
 *	  totally random colour depending on what was in page 0, and (b)
 *	  we don't de-reference a NULL pointer.
 *	- remove duplicated implementation of consistent_alloc()
 *	- convert dma address types to dma_addr_t
 *	- remove unused 'montype' stuff
 *	- remove redundant zero inits of init_var after the initial
 *	  memzero.
 *	- remove allow_modeset (acornfb idea does not belong here)
 *
 * 2001/05/28: <[e-mail]>
 *	- massive cleanup - move machine dependent data into structures
 *	- I've left various #warnings in - if you see one, and know
 *	  the hardware concerned, please get in contact with me.
 *
 * 2001/05/31: <[e-mail]>
 *	- Fix LCCR1 HSW value, fix all machine type specifications to
 *	  keep values in line.  (Please check your machine type specs)
 *
 * 2001/06/10: <[e-mail]>
 *	- Fiddle with the LCD controller from task context only; mainly
 *	  so that we can run with interrupts on, and sleep.
 *	- Convert #warnings into #errors.  No pain, no gain. ;)
 *
 * 2001/06/14: <[e-mail]>
 *	- Make the palette BPS value for 12bpp come out correctly.
 *	- Take notice of "greyscale" on any colour depth.
 *	- Make truecolor visuals use the RGB channel encoding information.
 *
 * 2001/07/02: <[e-mail]>
 *	- Fix colourmap problems.
 *
 * 2001/07/13: <[e-mail]>
 *	- Added support for the ICP LCD-Kit01 on LART. This LCD is
 *	  manufactured by Prime View, model no V16C6448AB
 *
 * 2001/07/23: <[e-mail]>
 *	- Hand merge version from handhelds.org CVS tree.  See patch
 *	  notes for 595/1 for more information.
 *	- Drop 12bpp (it's 16bpp with different colour register mappings).
 *	- This hardware can not do direct colour.  Therefore we don't
 *	  support it.
 *
 * 2001/07/27: <[e-mail]>
 *	- Halve YRES on dual scan LCDs.
 *
 * 2001/08/22: <[e-mail]>
 *	- Add b/w iPAQ pixclock value.
 *
 * 2001/10/12: <[e-mail]>
 *	- Add patch 681/1 and clean up stork definitions.
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/init.h>
#include <linux/cpufreq.h>

#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include <asm/uaccess.h>
#include <asm/arch/assabet.h>

#include <video/fbcon.h>
#include <video/fbcon-mfb.h>
#include <video/fbcon-cfb4.h>
#include <video/fbcon-cfb8.h>
#include <video/fbcon-cfb16.h>

/*
 * enable this if your panel appears to have broken
 */
#undef CHECK_COMPAT

/*
 * debugging?
 */
#define DEBUG 0
/*
 * Complain if VAR is out of range.
 */
#define DEBUG_VAR 1

#undef ASSABET_PAL_VIDEO

#include "sa1100fb.h"

void (*sa1100fb_blank_helper)(int blank);
EXPORT_SYMBOL(sa1100fb_blank_helper);


#ifdef CHECK_COMPAT
static void
sa1100fb_check_shadow(struct sa1100fb_lcd_reg *new_regs,
			   struct fb_var_screeninfo *var, u_int pcd)
{
	struct sa1100fb_lcd_reg shadow;
	int different = 0;

	/*
	 * These machines are good machines!
	 */
	if (machine_is_assabet() || machine_is_h3600())
		return;

	/*
	 * The following ones are bad, bad, bad.
	 * Please make yours good!
	 */
	if (machine_is_pangolin()) {
		DPRINTK("Configuring Pangolin LCD\n");
		shadow.lccr0 =
		    LCCR0_LEN + LCCR0_Color + LCCR0_LDM +
		    LCCR0_BAM + LCCR0_ERM + LCCR0_Act +
		    LCCR0_LtlEnd + LCCR0_DMADel(0);
		shadow.lccr1 =
		    LCCR1_DisWdth(var->xres) + LCCR1_HorSnchWdth(64) +
		    LCCR1_BegLnDel(160) + LCCR1_EndLnDel(24);
		shadow.lccr2 =
		    LCCR2_DisHght(var->yres) + LCCR2_VrtSnchWdth(7) +
		    LCCR2_BegFrmDel(7) + LCCR2_EndFrmDel(1);
		shadow.lccr3 =
		    LCCR3_PixClkDiv(pcd) + LCCR3_HorSnchH +
		    LCCR3_VrtSnchH + LCCR3_PixFlEdg + LCCR3_OutEnH;

		DPRINTK("pcd = %x, PixCldDiv(pcd)=%x\n",
			pcd, LCCR3_PixClkDiv(pcd));
	}
	if (machine_is_freebird()) {
		DPRINTK("Configuring  Freebird LCD\n");
#if 1
		shadow.lccr0 = 0x00000038;
		shadow.lccr1 = 0x010108e0;
		shadow.lccr2 = 0x0000053f;
		shadow.lccr3 = 0x00000c20;
#else
		shadow.lccr0 =
		    LCCR0_LEN + LCCR0_Color + LCCR0_Sngl +
		    LCCR0_LDM + LCCR0_BAM + LCCR0_ERM + LCCR0_Pas +
		    LCCR0_LtlEnd + LCCR0_DMADel(0);
		/* Check ,Chester */
		shadow.lccr1 =
		    LCCR1_DisWdth(var->xres) + LCCR1_HorSnchWdth(5) +
		    LCCR1_BegLnDel(61) + LCCR1_EndLnDel(9);
		/* Check ,Chester */
		shadow.lccr2 =
		    LCCR2_DisHght(var->yres) + LCCR2_VrtSnchWdth(1) +
		    LCCR2_BegFrmDel(3) + LCCR2_EndFrmDel(0);
		/* Check ,Chester */
		shadow.lccr3 =
		    LCCR3_OutEnH + LCCR3_PixFlEdg + LCCR3_VrtSnchH +
		    LCCR3_HorSnchH + LCCR3_ACBsCntOff +
		    LCCR3_ACBsDiv(2) + LCCR3_PixClkDiv(pcd);
#endif
	}
	if (machine_is_brutus()) {
		DPRINTK("Configuring  Brutus LCD\n");
		shadow.lccr0 =
		    LCCR0_LEN + LCCR0_Color + LCCR0_Sngl + LCCR0_Pas +
		    LCCR0_LtlEnd + LCCR0_LDM + LCCR0_BAM + LCCR0_ERM +
		    LCCR0_DMADel(0);
		shadow.lccr1 =
		    LCCR1_DisWdth(var->xres) + LCCR1_HorSnchWdth(3) +
		    LCCR1_BegLnDel(41) + LCCR1_EndLnDel(101);
		shadow.lccr2 =
		    LCCR2_DisHght(var->yres) + LCCR2_VrtSnchWdth(1) +
		    LCCR2_BegFrmDel(0) + LCCR2_EndFrmDel(0);
		shadow.lccr3 =
		    LCCR3_OutEnH + LCCR3_PixRsEdg + LCCR3_VrtSnchH +
		    LCCR3_HorSnchH + LCCR3_ACBsCntOff +
		    LCCR3_ACBsDiv(2) + LCCR3_PixClkDiv(44);
	}
	if (machine_is_huw_webpanel()) {
		DPRINTK("Configuring  HuW LCD\n");
		shadow.lccr0 = LCCR0_LEN + LCCR0_Dual + LCCR0_LDM;
		shadow.lccr1 = LCCR1_DisWdth(var->xres) +
		    LCCR1_HorSnchWdth(3) +
		    LCCR1_BegLnDel(41) + LCCR1_EndLnDel(101);
		shadow.lccr2 = 239 + LCCR2_VrtSnchWdth(1);
		shadow.lccr3 = 8 + LCCR3_OutEnH +
		    LCCR3_PixRsEdg + LCCR3_VrtSnchH +
		    LCCR3_HorSnchH + LCCR3_ACBsCntOff + LCCR3_ACBsDiv(2);
	}
	if (machine_is_lart()) {
		DPRINTK("Configuring LART LCD\n");
#if defined LART_GREY_LCD
		shadow.lccr0 =
		    LCCR0_LEN + LCCR0_Mono + LCCR0_Sngl + LCCR0_Pas +
		    LCCR0_LtlEnd + LCCR0_LDM + LCCR0_BAM + LCCR0_ERM +
		    LCCR0_DMADel(0);
		shadow.lccr1 =
		    LCCR1_DisWdth(var->xres) + LCCR1_HorSnchWdth(1) +
		    LCCR1_BegLnDel(4) + LCCR1_EndLnDel(2);
		shadow.lccr2 =
		    LCCR2_DisHght(var->yres) + LCCR2_VrtSnchWdth(1) +
		    LCCR2_BegFrmDel(0) + LCCR2_EndFrmDel(0);
		shadow.lccr3 =
		    LCCR3_PixClkDiv(34) + LCCR3_ACBsDiv(512) +
		    LCCR3_ACBsCntOff + LCCR3_HorSnchH + LCCR3_VrtSnchH;
#endif
#if defined LART_COLOR_LCD
		shadow.lccr0 =
		    LCCR0_LEN + LCCR0_Color + LCCR0_Sngl + LCCR0_Act +
		    LCCR0_LtlEnd + LCCR0_LDM + LCCR0_BAM + LCCR0_ERM +
		    LCCR0_DMADel(0);
		shadow.lccr1 =
		    LCCR1_DisWdth(var->xres) + LCCR1_HorSnchWdth(2) +
		    LCCR1_BegLnDel(69) + LCCR1_EndLnDel(8);
		shadow.lccr2 =
		    LCCR2_DisHght(var->yres) + LCCR2_VrtSnchWdth(3) +
		    LCCR2_BegFrmDel(14) + LCCR2_EndFrmDel(4);
		shadow.lccr3 =
		    LCCR3_PixClkDiv(34) + LCCR3_ACBsDiv(512) +
		    LCCR3_ACBsCntOff + LCCR3_HorSnchL + LCCR3_VrtSnchL +
		    LCCR3_PixFlEdg;
#endif
#if defined LART_VIDEO_OUT
		shadow.lccr0 =
		    LCCR0_LEN + LCCR0_Color + LCCR0_Sngl + LCCR0_Act +
		    LCCR0_LtlEnd + LCCR0_LDM + LCCR0_BAM + LCCR0_ERM +
		    LCCR0_DMADel(0);
		shadow.lccr1 =
		    LCCR1_DisWdth(640) + LCCR1_HorSnchWdth(95) +
		    LCCR1_BegLnDel(40) + LCCR1_EndLnDel(24);
		shadow.lccr2 =
		    LCCR2_DisHght(480) + LCCR2_VrtSnchWdth(2) +
		    LCCR2_BegFrmDel(32) + LCCR2_EndFrmDel(11);
		shadow.lccr3 =
		    LCCR3_PixClkDiv(8) + LCCR3_ACBsDiv(512) +
		    LCCR3_ACBsCntOff + LCCR3_HorSnchH + LCCR3_VrtSnchH +
		    LCCR3_PixFlEdg + LCCR3_OutEnL;
#endif
	}
	if (machine_is_graphicsclient()) {
		DPRINTK("Configuring GraphicsClient LCD\n");
		shadow.lccr0 =
		    LCCR0_LEN + LCCR0_Color + LCCR0_Sngl + LCCR0_Act;
		shadow.lccr1 =
		    LCCR1_DisWdth(var->xres) + LCCR1_HorSnchWdth(9) +
		    LCCR1_EndLnDel(54) + LCCR1_BegLnDel(54);
		shadow.lccr2 =
		    LCCR2_DisHght(var->yres) + LCCR2_VrtSnchWdth(9) +
		    LCCR2_EndFrmDel(32) + LCCR2_BegFrmDel(24);
		shadow.lccr3 =
		    LCCR3_PixClkDiv(10) + LCCR3_ACBsDiv(2) +
		    LCCR3_ACBsCntOff + LCCR3_HorSnchL + LCCR3_VrtSnchL;
	}
	if (machine_is_omnimeter()) {
		DPRINTK("Configuring  OMNI LCD\n");
		shadow.lccr0 = LCCR0_LEN | LCCR0_CMS | LCCR0_DPD;
		shadow.lccr1 =
		    LCCR1_BegLnDel(10) + LCCR1_EndLnDel(10) +
		    LCCR1_HorSnchWdth(1) + LCCR1_DisWdth(var->xres);
		shadow.lccr2 = LCCR2_DisHght(var->yres);
		shadow.lccr3 =
		    LCCR3_ACBsDiv(0xFF) + LCCR3_PixClkDiv(44);
//jca (GetPCD(25) << LCD3_V_PCD);
	}
	if (machine_is_xp860()) {
		DPRINTK("Configuring XP860 LCD\n");
		shadow.lccr0 =
		    LCCR0_LEN + LCCR0_Color + LCCR0_Sngl + LCCR0_Act +
		    LCCR0_LtlEnd + LCCR0_LDM + LCCR0_ERM + LCCR0_DMADel(0);
		shadow.lccr1 =
		    LCCR1_DisWdth(var->xres) +
		    LCCR1_HorSnchWdth(var->hsync_len) +
		    LCCR1_BegLnDel(var->left_margin) +
		    LCCR1_EndLnDel(var->right_margin);
		shadow.lccr2 =
		    LCCR2_DisHght(var->yres) +
		    LCCR2_VrtSnchWdth(var->vsync_len) +
		    LCCR2_BegFrmDel(var->upper_margin) +
		    LCCR2_EndFrmDel(var->lower_margin);
		shadow.lccr3 =
		    LCCR3_PixClkDiv(6) + LCCR3_HorSnchL + LCCR3_VrtSnchL;
	}

	/*
	 * Ok, since we're calculating these values, we want to know
	 * if the calculation is correct.  If you see any of these
	 * messages _PLEASE_ report the incident to me for diagnosis,
	 * including details about what was happening when the
	 * messages appeared. --rmk, 30 March 2001
	 */
	if (shadow.lccr0 != new_regs->lccr0) {
		printk(KERN_ERR "LCCR1 mismatch: 0x%08x != 0x%08x\n",
			shadow.lccr1, new_regs->lccr1);
		different = 1;
	}
	if (shadow.lccr1 != new_regs->lccr1) {
		printk(KERN_ERR "LCCR1 mismatch: 0x%08x != 0x%08x\n",
			shadow.lccr1, new_regs->lccr1);
		different = 1;
	}
	if (shadow.lccr2 != new_regs->lccr2) {
		printk(KERN_ERR "LCCR2 mismatch: 0x%08x != 0x%08x\n",
			shadow.lccr2, new_regs->lccr2);
		different = 1;
	}
	if (shadow.lccr3 != new_regs->lccr3) {
		printk(KERN_ERR "LCCR3 mismatch: 0x%08x != 0x%08x\n",
			shadow.lccr3, new_regs->lccr3);
		different = 1;
	}
	if (different) {
		printk(KERN_ERR "var: xres=%d hslen=%d lm=%d rm=%d\n",
			var->xres, var->hsync_len,
			var->left_margin, var->right_margin);
		printk(KERN_ERR "var: yres=%d vslen=%d um=%d bm=%d\n",
			var->yres, var->vsync_len,
			var->upper_margin, var->lower_margin);

		printk(KERN_ERR "Please report this to Russell King "
			"<[e-mail]>\n");
	}

	DPRINTK("olccr0 = 0x%08x\n", shadow.lccr0);
	DPRINTK("olccr1 = 0x%08x\n", shadow.lccr1);
	DPRINTK("olccr2 = 0x%08x\n", shadow.lccr2);
	DPRINTK("olccr3 = 0x%08x\n", shadow.lccr3);
}
#else
#define sa1100fb_check_shadow(regs,var,pcd)
#endif



/*
 * IMHO this looks wrong.  In 8BPP, length should be 8.
 */
static struct sa1100fb_rgb rgb_8 = {
	red:	{ offset: 0,  length: 4, },
	green:	{ offset: 0,  length: 4, },
	blue:	{ offset: 0,  length: 4, },
	transp:	{ offset: 0,  length: 0, },
};

static struct sa1100fb_rgb def_rgb_16 = {
	red:	{ offset: 11, length: 5, },
	green:	{ offset: 5,  length: 6, },
	blue:	{ offset: 0,  length: 5, },
	transp:	{ offset: 0,  length: 0, },
};

#ifdef CONFIG_SA1100_ASSABET
#ifndef ASSABET_PAL_VIDEO
/*
 * The assabet uses a sharp LQ039Q2DS54 LCD module.  It is actually
 * takes an RGB666 signal, but we provide it with an RGB565 signal
 * instead (def_rgb_16).
 */
static struct sa1100fb_mach_info lq039q2ds54_info __initdata = {
	pixclock:	171521,		bpp:		16,
	xres:		320,		yres:		240,

	hsync_len:	5,		vsync_len:	1,
	left_margin:	61,		upper_margin:	3,
	right_margin:	9,		lower_margin:	0,

	sync:		FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,

	lccr0:		LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
	lccr3:		LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2),
};
#else
static struct sa1100fb_mach_info pal_info __initdata = {
	pixclock:	67797,		bpp:		16,
	xres:		640,		yres:		512,

	hsync_len:	64,		vsync_len:	6,
	left_margin:	125,		upper_margin:	70,