gbefb.c

Linux Kernel 2.6.9 for OMAP1710

/*
 *  SGI GBE frame buffer driver
 *
 *  Copyright (C) 1999 Silicon Graphics, Inc. - Jeffrey Newquist
 *  Copyright (C) 2002 Vivien Chappelier <[e-mail]>
 *
 *  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/config.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>

#ifdef CONFIG_X86
#include <asm/mtrr.h>
#endif
#ifdef CONFIG_MIPS
#include <asm/addrspace.h>
#endif
#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/tlbflush.h>

#include <video/gbe.h>

static struct sgi_gbe *gbe;

struct gbefb_par {
	struct fb_var_screeninfo var;
	struct gbe_timing_info timing;
	int valid;
};

#ifdef CONFIG_SGI_IP32
#define GBE_BASE	0x16000000 /* SGI O2 */
#endif

#ifdef CONFIG_X86_VISWS
#define GBE_BASE	0xd0000000 /* SGI Visual Workstation */
#endif

/* macro for fastest write-though access to the framebuffer */
#ifdef CONFIG_MIPS
#ifdef CONFIG_CPU_R10000
#define pgprot_fb(_prot) (((_prot) & (~_CACHE_MASK)) | _CACHE_UNCACHED_ACCELERATED)
#else
#define pgprot_fb(_prot) (((_prot) & (~_CACHE_MASK)) | _CACHE_CACHABLE_NO_WA)
#endif
#endif
#ifdef CONFIG_X86
#define pgprot_fb(_prot) ((_prot) | _PAGE_PCD)
#endif

/*
 *  RAM we reserve for the frame buffer. This defines the maximum screen
 *  size
 */
#if CONFIG_FB_GBE_MEM > 8
#error GBE Framebuffer cannot use more than 8MB of memory
#endif

#define TILE_SHIFT 16
#define TILE_SIZE (1 << TILE_SHIFT)
#define TILE_MASK (TILE_SIZE - 1)

static unsigned int gbe_mem_size = CONFIG_FB_GBE_MEM * 1024*1024;
static void *gbe_mem;
static dma_addr_t gbe_dma_addr;
unsigned long gbe_mem_phys;

static struct {
	uint16_t *cpu;
	dma_addr_t dma;
} gbe_tiles;

static int gbe_revision;

static struct fb_info fb_info;
static int ypan, ywrap;

static uint32_t pseudo_palette[256];

static char *mode_option __initdata = NULL;

/* default CRT mode */
static struct fb_var_screeninfo default_var_CRT __initdata = {
	/* 640x480, 60 Hz, Non-Interlaced (25.175 MHz dotclock) */
	.xres		= 640,
	.yres		= 480,
	.xres_virtual	= 640,
	.yres_virtual	= 480,
	.xoffset	= 0,
	.yoffset	= 0,
	.bits_per_pixel	= 8,
	.grayscale	= 0,
	.red		= { 0, 8, 0 },
	.green		= { 0, 8, 0 },
	.blue		= { 0, 8, 0 },
	.transp		= { 0, 0, 0 },
	.nonstd		= 0,
	.activate	= 0,
	.height		= -1,
	.width		= -1,
	.accel_flags	= 0,
	.pixclock	= 39722,	/* picoseconds */
	.left_margin	= 48,
	.right_margin	= 16,
	.upper_margin	= 33,
	.lower_margin	= 10,
	.hsync_len	= 96,
	.vsync_len	= 2,
	.sync		= 0,
	.vmode		= FB_VMODE_NONINTERLACED,
};

/* default LCD mode */
static struct fb_var_screeninfo default_var_LCD __initdata = {
	/* 1600x1024, 8 bpp */
	.xres		= 1600,
	.yres		= 1024,
	.xres_virtual	= 1600,
	.yres_virtual	= 1024,
	.xoffset	= 0,
	.yoffset	= 0,
	.bits_per_pixel	= 8,
	.grayscale	= 0,
	.red		= { 0, 8, 0 },
	.green		= { 0, 8, 0 },
	.blue		= { 0, 8, 0 },
	.transp		= { 0, 0, 0 },
	.nonstd		= 0,
	.activate	= 0,
	.height		= -1,
	.width		= -1,
	.accel_flags	= 0,
	.pixclock	= 9353,
	.left_margin	= 20,
	.right_margin	= 30,
	.upper_margin	= 37,
	.lower_margin	= 3,
	.hsync_len	= 20,
	.vsync_len	= 3,
	.sync		= 0,
	.vmode		= FB_VMODE_NONINTERLACED
};

/* default modedb mode */
/* 640x480, 60 Hz, Non-Interlaced (25.172 MHz dotclock) */
static struct fb_videomode default_mode_CRT __initdata = {
	.refresh	= 60,
	.xres		= 640,
	.yres		= 480,
	.pixclock	= 39722,
	.left_margin	= 48,
	.right_margin	= 16,
	.upper_margin	= 33,
	.lower_margin	= 10,
	.hsync_len	= 96,
	.vsync_len	= 2,
	.sync		= 0,
	.vmode		= FB_VMODE_NONINTERLACED,
};
/* 1600x1024 SGI flatpanel 1600sw */
static struct fb_videomode default_mode_LCD __initdata = {
	/* 1600x1024, 8 bpp */
	.xres		= 1600,
	.yres		= 1024,
	.pixclock	= 9353,
	.left_margin	= 20,
	.right_margin	= 30,
	.upper_margin	= 37,
	.lower_margin	= 3,
	.hsync_len	= 20,
	.vsync_len	= 3,
	.vmode		= FB_VMODE_NONINTERLACED,
};

struct fb_videomode *default_mode = &default_mode_CRT;
struct fb_var_screeninfo *default_var = &default_var_CRT;

static int flat_panel_enabled = 0;

static struct gbefb_par par_current;

static void gbe_reset(void)
{
	/* Turn on dotclock PLL */
	gbe->ctrlstat = 0x300aa000;
}


/*
 * Function:	gbe_turn_off
 * Parameters:	(None)
 * Description:	This should turn off the monitor and gbe.  This is used
 *              when switching between the serial console and the graphics
 *              console.
 */

void gbe_turn_off(void)
{
	int i;
	unsigned int val, x, y, vpixen_off;

	/* check if pixel counter is on */
	val = gbe->vt_xy;
	if (GET_GBE_FIELD(VT_XY, FREEZE, val) == 1)
		return;

	/* turn off DMA */
	val = gbe->ovr_control;
	SET_GBE_FIELD(OVR_CONTROL, OVR_DMA_ENABLE, val, 0);
	gbe->ovr_control = val;
	udelay(1000);
	val = gbe->frm_control;
	SET_GBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, val, 0);
	gbe->frm_control = val;
	udelay(1000);
	val = gbe->did_control;
	SET_GBE_FIELD(DID_CONTROL, DID_DMA_ENABLE, val, 0);
	gbe->did_control = val;
	udelay(1000);

	/* We have to wait through two vertical retrace periods before
	 * the pixel DMA is turned off for sure. */
	for (i = 0; i < 10000; i++) {
		val = gbe->frm_inhwctrl;
		if (GET_GBE_FIELD(FRM_INHWCTRL, FRM_DMA_ENABLE, val)) {
			udelay(10);
		} else {
			val = gbe->ovr_inhwctrl;
			if (GET_GBE_FIELD(OVR_INHWCTRL, OVR_DMA_ENABLE, val)) {
				udelay(10);
			} else {
				val = gbe->did_inhwctrl;
				if (GET_GBE_FIELD(DID_INHWCTRL, DID_DMA_ENABLE, val)) {
					udelay(10);
				} else
					break;
			}
		}
	}
	if (i == 10000)
		printk(KERN_ERR "gbefb: turn off DMA timed out\n");

	/* wait for vpixen_off */
	val = gbe->vt_vpixen;
	vpixen_off = GET_GBE_FIELD(VT_VPIXEN, VPIXEN_OFF, val);

	for (i = 0; i < 100000; i++) {
		val = gbe->vt_xy;
		x = GET_GBE_FIELD(VT_XY, X, val);
		y = GET_GBE_FIELD(VT_XY, Y, val);
		if (y < vpixen_off)
			break;
		udelay(1);
	}
	if (i == 100000)
		printk(KERN_ERR
		       "gbefb: wait for vpixen_off timed out\n");
	for (i = 0; i < 10000; i++) {
		val = gbe->vt_xy;
		x = GET_GBE_FIELD(VT_XY, X, val);
		y = GET_GBE_FIELD(VT_XY, Y, val);
		if (y > vpixen_off)
			break;
		udelay(1);
	}
	if (i == 10000)
		printk(KERN_ERR "gbefb: wait for vpixen_off timed out\n");

	/* turn off pixel counter */
	val = 0;
	SET_GBE_FIELD(VT_XY, FREEZE, val, 1);
	gbe->vt_xy = val;
	udelay(10000);
	for (i = 0; i < 10000; i++) {
		val = gbe->vt_xy;
		if (GET_GBE_FIELD(VT_XY, FREEZE, val) != 1)
			udelay(10);
		else
			break;
	}
	if (i == 10000)
		printk(KERN_ERR "gbefb: turn off pixel clock timed out\n");

	/* turn off dot clock */
	val = gbe->dotclock;
	SET_GBE_FIELD(DOTCLK, RUN, val, 0);
	gbe->dotclock = val;
	udelay(10000);
	for (i = 0; i < 10000; i++) {
		val = gbe->dotclock;
		if (GET_GBE_FIELD(DOTCLK, RUN, val))
			udelay(10);
		else
			break;
	}
	if (i == 10000)
		printk(KERN_ERR "gbefb: turn off dotclock timed out\n");

	/* reset the frame DMA FIFO */
	val = gbe->frm_size_tile;
	SET_GBE_FIELD(FRM_SIZE_TILE, FRM_FIFO_RESET, val, 1);
	gbe->frm_size_tile = val;
	SET_GBE_FIELD(FRM_SIZE_TILE, FRM_FIFO_RESET, val, 0);
	gbe->frm_size_tile = val;
}

static void gbe_turn_on(void)
{
	unsigned int val, i;

	/*
	 * Check if pixel counter is off, for unknown reason this
	 * code hangs Visual Workstations
	 */
	if (gbe_revision < 2) {
		val = gbe->vt_xy;
		if (GET_GBE_FIELD(VT_XY, FREEZE, val) == 0)
			return;
	}

	/* turn on dot clock */
	val = gbe->dotclock;
	SET_GBE_FIELD(DOTCLK, RUN, val, 1);
	gbe->dotclock = val;
	udelay(10000);
	for (i = 0; i < 10000; i++) {
		val = gbe->dotclock;
		if (GET_GBE_FIELD(DOTCLK, RUN, val) != 1)
			udelay(10);
		else
			break;
	}
	if (i == 10000)
		printk(KERN_ERR "gbefb: turn on dotclock timed out\n");

	/* turn on pixel counter */
	val = 0;
	SET_GBE_FIELD(VT_XY, FREEZE, val, 0);
	gbe->vt_xy = val;
	udelay(10000);
	for (i = 0; i < 10000; i++) {
		val = gbe->vt_xy;
		if (GET_GBE_FIELD(VT_XY, FREEZE, val))
			udelay(10);
		else
			break;
	}
	if (i == 10000)
		printk(KERN_ERR "gbefb: turn on pixel clock timed out\n");

	/* turn on DMA */
	val = gbe->frm_control;
	SET_GBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, val, 1);
	gbe->frm_control = val;
	udelay(1000);
	for (i = 0; i < 10000; i++) {
		val = gbe->frm_inhwctrl;
		if (GET_GBE_FIELD(FRM_INHWCTRL, FRM_DMA_ENABLE, val) != 1)
			udelay(10);
		else
			break;
	}
	if (i == 10000)
		printk(KERN_ERR "gbefb: turn on DMA timed out\n");
}

/*
 *  Blank the display.
 */
static int gbefb_blank(int blank, struct fb_info *info)
{
	/* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
	switch (blank) {
	case 0:		/* unblank */
		gbe_turn_on();
		break;

	case 1:		/* blank */
		gbe_turn_off();
		break;

	default:
		/* Nothing */
		break;
	}
	return 0;
}

/*
 *  Setup flatpanel related registers.
 */