vt8623fb.c

Linux环境下视频显示卡设备的驱动程序源代码

/*
 * linux/drivers/video/vt8623fb.c - fbdev driver for
 * integrated graphic core in VIA VT8623 [CLE266] chipset
 *
 * Copyright (c) 2006-2007 Ondrej Zajicek <[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.
 *
 * Code is based on s3fb, some parts are from David Boucher's viafb
 * (http://davesdomain.org.uk/viafb/)
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/svga.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/console.h> /* Why should fb driver call console functions? because acquire_console_sem() */
#include <video/vga.h>

#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif

struct vt8623fb_info {
	char __iomem *mmio_base;
	int mtrr_reg;
	struct vgastate state;
	struct mutex open_lock;
	unsigned int ref_count;
	u32 pseudo_palette[16];
};



/* ------------------------------------------------------------------------- */

static const struct svga_fb_format vt8623fb_formats[] = {
	{ 0,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 0,
		FB_TYPE_TEXT, FB_AUX_TEXT_SVGA_STEP8,	FB_VISUAL_PSEUDOCOLOR, 16, 16},
	{ 4,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 0,
		FB_TYPE_PACKED_PIXELS, 0,		FB_VISUAL_PSEUDOCOLOR, 16, 16},
	{ 4,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 1,
		FB_TYPE_INTERLEAVED_PLANES, 1,		FB_VISUAL_PSEUDOCOLOR, 16, 16},
	{ 8,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 0,
		FB_TYPE_PACKED_PIXELS, 0,		FB_VISUAL_PSEUDOCOLOR, 8, 8},
/*	{16,  {10, 5, 0}, {5, 5, 0},  {0, 5, 0}, {0, 0, 0}, 0,
		FB_TYPE_PACKED_PIXELS, 0,		FB_VISUAL_TRUECOLOR, 4, 4},	*/
	{16,  {11, 5, 0}, {5, 6, 0},  {0, 5, 0}, {0, 0, 0}, 0,
		FB_TYPE_PACKED_PIXELS, 0,		FB_VISUAL_TRUECOLOR, 4, 4},
	{32,  {16, 8, 0}, {8, 8, 0},  {0, 8, 0}, {0, 0, 0}, 0,
		FB_TYPE_PACKED_PIXELS, 0,		FB_VISUAL_TRUECOLOR, 2, 2},
	SVGA_FORMAT_END
};

static const struct svga_pll vt8623_pll = {2, 127, 2, 7, 0, 3,
	60000, 300000, 14318};

/* CRT timing register sets */

static struct vga_regset vt8623_h_total_regs[]       = {{0x00, 0, 7}, {0x36, 3, 3}, VGA_REGSET_END};
static struct vga_regset vt8623_h_display_regs[]     = {{0x01, 0, 7}, VGA_REGSET_END};
static struct vga_regset vt8623_h_blank_start_regs[] = {{0x02, 0, 7}, VGA_REGSET_END};
static struct vga_regset vt8623_h_blank_end_regs[]   = {{0x03, 0, 4}, {0x05, 7, 7}, {0x33, 5, 5}, VGA_REGSET_END};
static struct vga_regset vt8623_h_sync_start_regs[]  = {{0x04, 0, 7}, {0x33, 4, 4}, VGA_REGSET_END};
static struct vga_regset vt8623_h_sync_end_regs[]    = {{0x05, 0, 4}, VGA_REGSET_END};

static struct vga_regset vt8623_v_total_regs[]       = {{0x06, 0, 7}, {0x07, 0, 0}, {0x07, 5, 5}, {0x35, 0, 0}, VGA_REGSET_END};
static struct vga_regset vt8623_v_display_regs[]     = {{0x12, 0, 7}, {0x07, 1, 1}, {0x07, 6, 6}, {0x35, 2, 2}, VGA_REGSET_END};
static struct vga_regset vt8623_v_blank_start_regs[] = {{0x15, 0, 7}, {0x07, 3, 3}, {0x09, 5, 5}, {0x35, 3, 3}, VGA_REGSET_END};
static struct vga_regset vt8623_v_blank_end_regs[]   = {{0x16, 0, 7}, VGA_REGSET_END};
static struct vga_regset vt8623_v_sync_start_regs[]  = {{0x10, 0, 7}, {0x07, 2, 2}, {0x07, 7, 7}, {0x35, 1, 1}, VGA_REGSET_END};
static struct vga_regset vt8623_v_sync_end_regs[]    = {{0x11, 0, 3}, VGA_REGSET_END};

static struct vga_regset vt8623_offset_regs[]        = {{0x13, 0, 7}, {0x35, 5, 7}, VGA_REGSET_END};
static struct vga_regset vt8623_line_compare_regs[]  = {{0x18, 0, 7}, {0x07, 4, 4}, {0x09, 6, 6}, {0x33, 0, 2}, {0x35, 4, 4}, VGA_REGSET_END};
static struct vga_regset vt8623_fetch_count_regs[]   = {{0x1C, 0, 7}, {0x1D, 0, 1}, VGA_REGSET_END};
static struct vga_regset vt8623_start_address_regs[] = {{0x0d, 0, 7}, {0x0c, 0, 7}, {0x34, 0, 7}, {0x48, 0, 1}, VGA_REGSET_END};

static struct svga_timing_regs vt8623_timing_regs     = {
	vt8623_h_total_regs, vt8623_h_display_regs, vt8623_h_blank_start_regs,
	vt8623_h_blank_end_regs, vt8623_h_sync_start_regs, vt8623_h_sync_end_regs,
	vt8623_v_total_regs, vt8623_v_display_regs, vt8623_v_blank_start_regs,
	vt8623_v_blank_end_regs, vt8623_v_sync_start_regs, vt8623_v_sync_end_regs,
};


/* ------------------------------------------------------------------------- */


/* Module parameters */

static char *mode_option = "640x480-8@60";

#ifdef CONFIG_MTRR
static int mtrr = 1;
#endif

MODULE_AUTHOR("(c) 2006 Ondrej Zajicek <[e-mail]>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("fbdev driver for integrated graphics core in VIA VT8623 [CLE266]");

module_param(mode_option, charp, 0644);
MODULE_PARM_DESC(mode_option, "Default video mode ('640x480-8@60', etc)");
module_param_named(mode, mode_option, charp, 0);
MODULE_PARM_DESC(mode, "Default video mode e.g. '648x480-8@60' (deprecated)");

#ifdef CONFIG_MTRR
module_param(mtrr, int, 0444);
MODULE_PARM_DESC(mtrr, "Enable write-combining with MTRR (1=enable, 0=disable, default=1)");
#endif


/* ------------------------------------------------------------------------- */


static struct fb_tile_ops vt8623fb_tile_ops = {
	.fb_settile	= svga_settile,
	.fb_tilecopy	= svga_tilecopy,
	.fb_tilefill    = svga_tilefill,
	.fb_tileblit    = svga_tileblit,
	.fb_tilecursor  = svga_tilecursor,
	.fb_get_tilemax = svga_get_tilemax,
};


/* ------------------------------------------------------------------------- */


/* image data is MSB-first, fb structure is MSB-first too */
static inline u32 expand_color(u32 c)
{
	return ((c & 1) | ((c & 2) << 7) | ((c & 4) << 14) | ((c & 8) << 21)) * 0xFF;
}

/* vt8623fb_iplan_imageblit silently assumes that almost everything is 8-pixel aligned */
static void vt8623fb_iplan_imageblit(struct fb_info *info, const struct fb_image *image)
{
	u32 fg = expand_color(image->fg_color);
	u32 bg = expand_color(image->bg_color);
	const u8 *src1, *src;
	u8 __iomem *dst1;
	u32 __iomem *dst;
	u32 val;
	int x, y;

	src1 = image->data;
	dst1 = info->screen_base + (image->dy * info->fix.line_length)
		 + ((image->dx / 8) * 4);

	for (y = 0; y < image->height; y++) {
		src = src1;
		dst = (u32 __iomem *) dst1;
		for (x = 0; x < image->width; x += 8) {
			val = *(src++) * 0x01010101;
			val = (val & fg) | (~val & bg);
			fb_writel(val, dst++);
		}
		src1 += image->width / 8;
		dst1 += info->fix.line_length;
	}
}

/* vt8623fb_iplan_fillrect silently assumes that almost everything is 8-pixel aligned */
static void vt8623fb_iplan_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
	u32 fg = expand_color(rect->color);
	u8 __iomem *dst1;
	u32 __iomem *dst;
	int x, y;

	dst1 = info->screen_base + (rect->dy * info->fix.line_length)
		 + ((rect->dx / 8) * 4);

	for (y = 0; y < rect->height; y++) {
		dst = (u32 __iomem *) dst1;
		for (x = 0; x < rect->width; x += 8) {
			fb_writel(fg, dst++);
		}
		dst1 += info->fix.line_length;
	}
}


/* image data is MSB-first, fb structure is high-nibble-in-low-byte-first */
static inline u32 expand_pixel(u32 c)
{
	return (((c &  1) << 24) | ((c &  2) << 27) | ((c &  4) << 14) | ((c &   8) << 17) |
		((c & 16) <<  4) | ((c & 32) <<  7) | ((c & 64) >>  6) | ((c & 128) >>  3)) * 0xF;
}

/* vt8623fb_cfb4_imageblit silently assumes that almost everything is 8-pixel aligned */
static void vt8623fb_cfb4_imageblit(struct fb_info *info, const struct fb_image *image)
{
	u32 fg = image->fg_color * 0x11111111;
	u32 bg = image->bg_color * 0x11111111;
	const u8 *src1, *src;
	u8 __iomem *dst1;
	u32 __iomem *dst;
	u32 val;
	int x, y;

	src1 = image->data;
	dst1 = info->screen_base + (image->dy * info->fix.line_length)
		 + ((image->dx / 8) * 4);

	for (y = 0; y < image->height; y++) {
		src = src1;
		dst = (u32 __iomem *) dst1;
		for (x = 0; x < image->width; x += 8) {
			val = expand_pixel(*(src++));
			val = (val & fg) | (~val & bg);
			fb_writel(val, dst++);
		}
		src1 += image->width / 8;
		dst1 += info->fix.line_length;
	}
}

static void vt8623fb_imageblit(struct fb_info *info, const struct fb_image *image)
{
	if ((info->var.bits_per_pixel == 4) && (image->depth == 1)
	    && ((image->width % 8) == 0) && ((image->dx % 8) == 0)) {
		if (info->fix.type == FB_TYPE_INTERLEAVED_PLANES)
			vt8623fb_iplan_imageblit(info, image);
		else
			vt8623fb_cfb4_imageblit(info, image);
	} else
		cfb_imageblit(info, image);
}

static void vt8623fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
	if ((info->var.bits_per_pixel == 4)
	    && ((rect->width % 8) == 0) && ((rect->dx % 8) == 0)
	    && (info->fix.type == FB_TYPE_INTERLEAVED_PLANES))
		vt8623fb_iplan_fillrect(info, rect);
	 else
		cfb_fillrect(info, rect);
}


/* ------------------------------------------------------------------------- */


static void vt8623_set_pixclock(struct fb_info *info, u32 pixclock)
{
	u16 m, n, r;
	u8 regval;
	int rv;

	rv = svga_compute_pll(&vt8623_pll, 1000000000 / pixclock, &m, &n, &r, info->node);
	if (rv < 0) {
		printk(KERN_ERR "fb%d: cannot set requested pixclock, keeping old value\n", info->node);
		return;
	}

	/* Set VGA misc register  */
	regval = vga_r(NULL, VGA_MIS_R);
	vga_w(NULL, VGA_MIS_W, regval | VGA_MIS_ENB_PLL_LOAD);

	/* Set clock registers */
	vga_wseq(NULL, 0x46, (n  | (r << 6)));
	vga_wseq(NULL, 0x47, m);

	udelay(1000);

	/* PLL reset */
	svga_wseq_mask(0x40, 0x02, 0x02);
	svga_wseq_mask(0x40, 0x00, 0x02);
}


static int vt8623fb_open(struct fb_info *info, int user)
{
	struct vt8623fb_info *par = info->par;

	mutex_lock(&(par->open_lock));
	if (par->ref_count == 0) {
		memset(&(par->state), 0, sizeof(struct vgastate));
		par->state.flags = VGA_SAVE_MODE | VGA_SAVE_FONTS | VGA_SAVE_CMAP;
		par->state.num_crtc = 0xA2;
		par->state.num_seq = 0x50;
		save_vga(&(par->state));
	}

	par->ref_count++;
	mutex_unlock(&(par->open_lock));

	return 0;
}

static int vt8623fb_release(struct fb_info *info, int user)
{
	struct vt8623fb_info *par = info->par;

	mutex_lock(&(par->open_lock));
	if (par->ref_count == 0) {
		mutex_unlock(&(par->open_lock));
		return -EINVAL;
	}

	if (par->ref_count == 1)
		restore_vga(&(par->state));

	par->ref_count--;
	mutex_unlock(&(par->open_lock));

	return 0;
}

static int vt8623fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	int rv, mem, step;

	/* Find appropriate format */
	rv = svga_match_format (vt8623fb_formats, var, NULL);
	if (rv < 0)
	{
		printk(KERN_ERR "fb%d: unsupported mode requested\n", info->node);
		return rv;
	}

	/* Do not allow to have real resoulution larger than virtual */
	if (var->xres > var->xres_virtual)
		var->xres_virtual = var->xres;

	if (var->yres > var->yres_virtual)
		var->yres_virtual = var->yres;

	/* Round up xres_virtual to have proper alignment of lines */
	step = vt8623fb_formats[rv].xresstep - 1;
	var->xres_virtual = (var->xres_virtual+step) & ~step;

	/* Check whether have enough memory */
	mem = ((var->bits_per_pixel * var->xres_virtual) >> 3) * var->yres_virtual;
	if (mem > info->screen_size)
	{
		printk(KERN_ERR "fb%d: not enough framebuffer memory (%d kB requested , %d kB available)\n", info->node, mem >> 10, (unsigned int) (info->screen_size >> 10));
		return -EINVAL;
	}

	/* Text mode is limited to 256 kB of memory */
	if ((var->bits_per_pixel == 0) && (mem > (256*1024)))
	{
		printk(KERN_ERR "fb%d: text framebuffer size too large (%d kB requested, 256 kB possible)\n", info->node, mem >> 10);
		return -EINVAL;
	}

	rv = svga_check_timings (&vt8623_timing_regs, var, info->node);
	if (rv < 0)
	{
		printk(KERN_ERR "fb%d: invalid timings requested\n", info->node);
		return rv;
	}

	/* Interlaced mode not supported */
	if (var->vmode & FB_VMODE_INTERLACED)
		return -EINVAL;

	return 0;
}


static int vt8623fb_set_par(struct fb_info *info)
{
	u32 mode, offset_value, fetch_value, screen_size;
	u32 bpp = info->var.bits_per_pixel;

	if (bpp != 0) {
		info->fix.ypanstep = 1;
		info->fix.line_length = (info->var.xres_virtual * bpp) / 8;

		info->flags &= ~FBINFO_MISC_TILEBLITTING;
		info->tileops = NULL;

		/* in 4bpp supports 8p wide tiles only, any tiles otherwise */
		info->pixmap.blit_x = (bpp == 4) ? (1 << (8 - 1)) : (~(u32)0);
		info->pixmap.blit_y = ~(u32)0;

		offset_value = (info->var.xres_virtual * bpp) / 64;
		fetch_value  = ((info->var.xres * bpp) / 128) + 4;

		if (bpp == 4)
			fetch_value  = (info->var.xres / 8) + 8; /* + 0 is OK */

		screen_size  = info->var.yres_virtual * info->fix.line_length;
	} else {
		info->fix.ypanstep = 16;
		info->fix.line_length = 0;

		info->flags |= FBINFO_MISC_TILEBLITTING;
		info->tileops = &vt8623fb_tile_ops;

		/* supports 8x16 tiles only */
		info->pixmap.blit_x = 1 << (8 - 1);
		info->pixmap.blit_y = 1 << (16 - 1);

		offset_value = info->var.xres_virtual / 16;
		fetch_value  = (info->var.xres / 8) + 8;
		screen_size  = (info->var.xres_virtual * info->var.yres_virtual) / 64;
	}

	info->var.xoffset = 0;
	info->var.yoffset = 0;
	info->var.activate = FB_ACTIVATE_NOW;

	/* Unlock registers */
	svga_wseq_mask(0x10, 0x01, 0x01);
	svga_wcrt_mask(0x11, 0x00, 0x80);
	svga_wcrt_mask(0x47, 0x00, 0x01);

	/* Device, screen and sync off */
	svga_wseq_mask(0x01, 0x20, 0x20);
	svga_wcrt_mask(0x36, 0x30, 0x30);
	svga_wcrt_mask(0x17, 0x00, 0x80);

	/* Set default values */
	svga_set_default_gfx_regs();
	svga_set_default_atc_regs();
	svga_set_default_seq_regs();
	svga_set_default_crt_regs();
	svga_wcrt_multi(vt8623_line_compare_regs, 0xFFFFFFFF);
	svga_wcrt_multi(vt8623_start_address_regs, 0);

	svga_wcrt_multi(vt8623_offset_regs, offset_value);
	svga_wseq_multi(vt8623_fetch_count_regs, fetch_value);

	/* Clear H/V Skew */
	svga_wcrt_mask(0x03, 0x00, 0x60);
	svga_wcrt_mask(0x05, 0x00, 0x60);

	if (info->var.vmode & FB_VMODE_DOUBLE)
		svga_wcrt_mask(0x09, 0x80, 0x80);
	else
		svga_wcrt_mask(0x09, 0x00, 0x80);

	svga_wseq_mask(0x1E, 0xF0, 0xF0); // DI/DVP bus
	svga_wseq_mask(0x2A, 0x0F, 0x0F); // DI/DVP bus
	svga_wseq_mask(0x16, 0x08, 0xBF); // FIFO read treshold
	vga_wseq(NULL, 0x17, 0x1F);       // FIFO depth
	vga_wseq(NULL, 0x18, 0x4E);
	svga_wseq_mask(0x1A, 0x08, 0x08); // enable MMIO ?

	vga_wcrt(NULL, 0x32, 0x00);
	vga_wcrt(NULL, 0x34, 0x00);
	vga_wcrt(NULL, 0x6A, 0x80);
	vga_wcrt(NULL, 0x6A, 0xC0);

	vga_wgfx(NULL, 0x20, 0x00);
	vga_wgfx(NULL, 0x21, 0x00);
	vga_wgfx(NULL, 0x22, 0x00);

	/* Set SR15 according to number of bits per pixel */
	mode = svga_match_format(vt8623fb_formats, &(info->var), &(info->fix));
	switch (mode) {
	case 0: