sa1100fb.c

Linux环境下视频显示卡设备的驱动程序源代码

/*
 *  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.
 *
 *	- The following must never be specified in a panel definition:
 *	     LCCR0_LtlEnd, LCCR3_PixClkDiv, LCCR3_VrtSnchL, LCCR3_HorSnchL
 *
 *	- The following should be specified:
 *	     either LCCR0_Color or LCCR0_Mono
 *	     either LCCR0_Sngl or LCCR0_Dual
 *	     either LCCR0_Act or LCCR0_Pas
 *	     either LCCR3_OutEnH or LCCD3_OutEnL
 *	     either LCCR3_PixRsEdg or LCCR3_PixFlEdg
 *	     either LCCR3_ACBsDiv or LCCR3_ACBsCntOff
 *
 * 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
 *	  memset.
 *	- 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/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/mm.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/cpufreq.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/mutex.h>

#include <mach/hardware.h>
#include <asm/io.h>
#include <asm/mach-types.h>
#include <mach/assabet.h>
#include <mach/shannon.h>

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

#undef ASSABET_PAL_VIDEO

#include "sa1100fb.h"

extern void (*sa1100fb_backlight_power)(int on);
extern void (*sa1100fb_lcd_power)(int on);

/*
 * 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,
	.right_margin	= 115,		.lower_margin	= 36,

	.lccr0		= LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
	.lccr3		= LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(512),
};
#endif
#endif

#ifdef CONFIG_SA1100_H3800
static struct sa1100fb_mach_info h3800_info __initdata = {
	.pixclock	= 174757, 	.bpp		= 16,
	.xres		= 320,		.yres		= 240,

	.hsync_len	= 3,		.vsync_len	= 3,
	.left_margin	= 12,		.upper_margin	= 10,
	.right_margin	= 17,		.lower_margin	= 1,

	.cmap_static	= 1,

	.lccr0		= LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
	.lccr3		= LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2),
};
#endif

#ifdef CONFIG_SA1100_H3600
static struct sa1100fb_mach_info h3600_info __initdata = {
	.pixclock	= 174757, 	.bpp		= 16,
	.xres		= 320,		.yres		= 240,

	.hsync_len	= 3,		.vsync_len	= 3,
	.left_margin	= 12,		.upper_margin	= 10,
	.right_margin	= 17,		.lower_margin	= 1,

	.cmap_static	= 1,

	.lccr0		= LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
	.lccr3		= LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2),
};

static struct sa1100fb_rgb h3600_rgb_16 = {
	.red	= { .offset = 12, .length = 4, },
	.green	= { .offset = 7,  .length = 4, },
	.blue	= { .offset = 1,  .length = 4, },
	.transp	= { .offset = 0,  .length = 0, },
};
#endif

#ifdef CONFIG_SA1100_H3100
static struct sa1100fb_mach_info h3100_info __initdata = {
	.pixclock	= 406977, 	.bpp		= 4,
	.xres		= 320,		.yres		= 240,

	.hsync_len	= 26,		.vsync_len	= 41,
	.left_margin	= 4,		.upper_margin	= 0,
	.right_margin	= 4,		.lower_margin	= 0,

	.sync		= FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	.cmap_greyscale	= 1,
	.cmap_inverse	= 1,

	.lccr0		= LCCR0_Mono | LCCR0_4PixMono | LCCR0_Sngl | LCCR0_Pas,
	.lccr3		= LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2),
};
#endif

#ifdef CONFIG_SA1100_COLLIE
static struct sa1100fb_mach_info collie_info __initdata = {
	.pixclock	= 171521,	.bpp		= 16,
	.xres		= 320,		.yres		= 240,

	.hsync_len	= 5,		.vsync_len	= 1,
	.left_margin	= 11,		.upper_margin	= 2,
	.right_margin	= 30,		.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),
};
#endif

#ifdef LART_GREY_LCD
static struct sa1100fb_mach_info lart_grey_info __initdata = {
	.pixclock	= 150000,	.bpp		= 4,
	.xres		= 320,		.yres		= 240,

	.hsync_len	= 1,		.vsync_len	= 1,
	.left_margin	= 4,		.upper_margin	= 0,
	.right_margin	= 2,		.lower_margin	= 0,

	.cmap_greyscale	= 1,
	.sync		= FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,

	.lccr0		= LCCR0_Mono | LCCR0_Sngl | LCCR0_Pas | LCCR0_4PixMono,
	.lccr3		= LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(512),
};
#endif
#ifdef LART_COLOR_LCD
static struct sa1100fb_mach_info lart_color_info __initdata = {
	.pixclock	= 150000,	.bpp		= 16,
	.xres		= 320,		.yres		= 240,

	.hsync_len	= 2,		.vsync_len	= 3,
	.left_margin	= 69,		.upper_margin	= 14,
	.right_margin	= 8,		.lower_margin	= 4,

	.lccr0		= LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
	.lccr3		= LCCR3_OutEnH | LCCR3_PixFlEdg | LCCR3_ACBsDiv(512),
};
#endif
#ifdef LART_VIDEO_OUT
static struct sa1100fb_mach_info lart_video_info __initdata = {
	.pixclock	= 39721,	.bpp		= 16,
	.xres		= 640,		.yres		= 480,

	.hsync_len	= 95,		.vsync_len	= 2,
	.left_margin	= 40,		.upper_margin	= 32,
	.right_margin	= 24,		.lower_margin	= 11,

	.sync		= FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,

	.lccr0		= LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
	.lccr3		= LCCR3_OutEnL | LCCR3_PixFlEdg | LCCR3_ACBsDiv(512),
};
#endif

#ifdef LART_KIT01_LCD
static struct sa1100fb_mach_info lart_kit01_info __initdata = {
	.pixclock	= 63291,	.bpp		= 16,
	.xres		= 640,		.yres		= 480,

	.hsync_len	= 64,		.vsync_len	= 3,
	.left_margin	= 122,		.upper_margin	= 45,
	.right_margin	= 10,		.lower_margin	= 10,

	.lccr0		= LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
	.lccr3		= LCCR3_OutEnH | LCCR3_PixFlEdg
};
#endif

#ifdef CONFIG_SA1100_SHANNON
static struct sa1100fb_mach_info shannon_info __initdata = {
	.pixclock	= 152500,	.bpp		= 8,
	.xres		= 640,		.yres		= 480,

	.hsync_len	= 4,		.vsync_len	= 3,
	.left_margin	= 2,		.upper_margin	= 0,
	.right_margin	= 1,		.lower_margin	= 0,

	.sync		= FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,

	.lccr0		= LCCR0_Color | LCCR0_Dual | LCCR0_Pas,
	.lccr3		= LCCR3_ACBsDiv(512),
};
#endif



static struct sa1100fb_mach_info * __init
sa1100fb_get_machine_info(struct sa1100fb_info *fbi)
{
	struct sa1100fb_mach_info *inf = NULL;

	/*
	 *            R        G       B       T
	 * default  {11,5}, { 5,6}, { 0,5}, { 0,0}
	 * h3600    {12,4}, { 7,4}, { 1,4}, { 0,0}
	 * freebird { 8,4}, { 4,4}, { 0,4}, {12,4}
	 */
#ifdef CONFIG_SA1100_ASSABET
	if (machine_is_assabet()) {
#ifndef ASSABET_PAL_VIDEO
		inf = &lq039q2ds54_info;
#else
		inf = &pal_info;
#endif
	}
#endif
#ifdef CONFIG_SA1100_H3100
	if (machine_is_h3100()) {
		inf = &h3100_info;
	}
#endif
#ifdef CONFIG_SA1100_H3600
	if (machine_is_h3600()) {
		inf = &h3600_info;
		fbi->rgb[RGB_16] = &h3600_rgb_16;
	}
#endif
#ifdef CONFIG_SA1100_H3800
	if (machine_is_h3800()) {
		inf = &h3800_info;
	}
#endif
#ifdef CONFIG_SA1100_COLLIE
	if (machine_is_collie()) {
		inf = &collie_info;
	}
#endif
#ifdef CONFIG_SA1100_LART
	if (machine_is_lart()) {
#ifdef LART_GREY_LCD
		inf = &lart_grey_info;
#endif
#ifdef LART_COLOR_LCD
		inf = &lart_color_info;
#endif
#ifdef LART_VIDEO_OUT
		inf = &lart_video_info;
#endif
#ifdef LART_KIT01_LCD
		inf = &lart_kit01_info;
#endif
	}
#endif
#ifdef CONFIG_SA1100_SHANNON
	if (machine_is_shannon()) {
		inf = &shannon_info;
	}
#endif
	return inf;
}

static int sa1100fb_activate_var(struct fb_var_screeninfo *var, struct sa1100fb_info *);
static void set_ctrlr_state(struct sa1100fb_info *fbi, u_int state);

static inline void sa1100fb_schedule_work(struct sa1100fb_info *fbi, u_int state)
{
	unsigned long flags;

	local_irq_save(flags);
	/*
	 * We need to handle two requests being made at the same time.
	 * There are two important cases:
	 *  1. When we are changing VT (C_REENABLE) while unblanking (C_ENABLE)
	 *     We must perform the unblanking, which will do our REENABLE for us.
	 *  2. When we are blanking, but immediately unblank before we have
	 *     blanked.  We do the "REENABLE" thing here as well, just to be sure.
	 */
	if (fbi->task_state == C_ENABLE && state == C_REENABLE)
		state = (u_int) -1;
	if (fbi->task_state == C_DISABLE && state == C_ENABLE)
		state = C_REENABLE;

	if (state != (u_int)-1) {
		fbi->task_state = state;
		schedule_work(&fbi->task);
	}
	local_irq_restore(flags);
}

static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
{
	chan &= 0xffff;
	chan >>= 16 - bf->length;
	return chan << bf->offset;
}

/*
 * Convert bits-per-pixel to a hardware palette PBS value.
 */
static inline u_int palette_pbs(struct fb_var_screeninfo *var)
{
	int ret = 0;
	switch (var->bits_per_pixel) {
	case 4:  ret = 0 << 12;	break;
	case 8:  ret = 1 << 12; break;
	case 16: ret = 2 << 12; break;
	}
	return ret;
}

static int
sa1100fb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
		       u_int trans, struct fb_info *info)
{
	struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
	u_int val, ret = 1;

	if (regno < fbi->palette_size) {
		val = ((red >> 4) & 0xf00);
		val |= ((green >> 8) & 0x0f0);