s1d13xxxfb.c

Linux环境下视频显示卡设备的驱动程序源代码

	{4, 8, 16, -1},
	{9, 12, 18, -1},
};

/**
 *      s1d13xxxfb_fetch_hw_state - Configure the framebuffer according to
 *	hardware setup.
 *      @info: frame buffer structure
 *
 *	We setup the framebuffer structures according to the current
 *	hardware setup. On some machines, the BIOS will have filled
 *	the chip registers with such info, on others, these values will
 *	have been written in some init procedure. In any case, the
 *	software values needs to match the hardware ones. This is what
 *	this function ensures.
 *
 *	Note: some of the hardcoded values here might need some love to
 *	work on various chips, and might need to no longer be hardcoded.
 */
static void __devinit
s1d13xxxfb_fetch_hw_state(struct fb_info *info)
{
	struct fb_var_screeninfo *var = &info->var;
	struct fb_fix_screeninfo *fix = &info->fix;
	struct s1d13xxxfb_par *par = info->par;
	u8 panel, display;
	u16 offset;
	u32 xres, yres;
	u32 xres_virtual, yres_virtual;
	int bpp, lcd_bpp;
	int is_color, is_dual, is_tft;
	int lcd_enabled, crt_enabled;

	fix->type = FB_TYPE_PACKED_PIXELS;

	/* general info */
	par->display = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
	crt_enabled = (par->display & 0x02) != 0;
	lcd_enabled = (par->display & 0x01) != 0;

	if (lcd_enabled && crt_enabled)
		printk(KERN_WARNING PFX "Warning: LCD and CRT detected, using LCD\n");

	if (lcd_enabled)
		display = s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_MODE);
	else	/* CRT */
		display = s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_MODE);

	bpp = display & 0x07;

	switch (bpp) {
		case 2:	/* 4 bpp */
		case 3:	/* 8 bpp */
			var->bits_per_pixel = 8;
			var->red.offset = var->green.offset = var->blue.offset = 0;
			var->red.length = var->green.length = var->blue.length = 8;
			break;
		case 5:	/* 16 bpp */
			s1d13xxxfb_setup_truecolour(info);
			break;
		default:
			dbg("bpp: %i\n", bpp);
	}
	fb_alloc_cmap(&info->cmap, 256, 0);

	/* LCD info */
	panel = s1d13xxxfb_readreg(par, S1DREG_PANEL_TYPE);
	is_color = (panel & 0x04) != 0;
	is_dual = (panel & 0x02) != 0;
	is_tft = (panel & 0x01) != 0;
	lcd_bpp = s1d13xxxfb_width_tab[is_tft][(panel >> 4) & 3];

	if (lcd_enabled) {
		xres = (s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_HWIDTH) + 1) * 8;
		yres = (s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_VHEIGHT0) +
			((s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_VHEIGHT1) & 0x03) << 8) + 1);

		offset = (s1d13xxxfb_readreg(par, S1DREG_LCD_MEM_OFF0) +
			((s1d13xxxfb_readreg(par, S1DREG_LCD_MEM_OFF1) & 0x7) << 8));
	} else { /* crt */
		xres = (s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_HWIDTH) + 1) * 8;
		yres = (s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_VHEIGHT0) +
			((s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_VHEIGHT1) & 0x03) << 8) + 1);

		offset = (s1d13xxxfb_readreg(par, S1DREG_CRT_MEM_OFF0) +
			((s1d13xxxfb_readreg(par, S1DREG_CRT_MEM_OFF1) & 0x7) << 8));
	}
	xres_virtual = offset * 16 / var->bits_per_pixel;
	yres_virtual = fix->smem_len / (offset * 2);

	var->xres		= xres;
	var->yres		= yres;
	var->xres_virtual	= xres_virtual;
	var->yres_virtual	= yres_virtual;
	var->xoffset		= var->yoffset = 0;

	fix->line_length	= offset * 2;

	var->grayscale		= !is_color;

	var->activate		= FB_ACTIVATE_NOW;

	dbg(PFX "bpp=%d, lcd_bpp=%d, "
		"crt_enabled=%d, lcd_enabled=%d\n",
		var->bits_per_pixel, lcd_bpp, crt_enabled, lcd_enabled);
	dbg(PFX "xres=%d, yres=%d, vxres=%d, vyres=%d "
		"is_color=%d, is_dual=%d, is_tft=%d\n",
		xres, yres, xres_virtual, yres_virtual, is_color, is_dual, is_tft);
}


static int
s1d13xxxfb_remove(struct platform_device *pdev)
{
	struct fb_info *info = platform_get_drvdata(pdev);
	struct s1d13xxxfb_par *par = NULL;

	if (info) {
		par = info->par;
		if (par && par->regs) {
			/* disable output & enable powersave */
			s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, 0x00);
			s1d13xxxfb_writereg(par, S1DREG_PS_CNF, 0x11);
			iounmap(par->regs);
		}

		fb_dealloc_cmap(&info->cmap);

		if (info->screen_base)
			iounmap(info->screen_base);

		framebuffer_release(info);
	}

	release_mem_region(pdev->resource[0].start,
			pdev->resource[0].end - pdev->resource[0].start +1);
	release_mem_region(pdev->resource[1].start,
			pdev->resource[1].end - pdev->resource[1].start +1);
	return 0;
}

static int __devinit
s1d13xxxfb_probe(struct platform_device *pdev)
{
	struct s1d13xxxfb_par *default_par;
	struct fb_info *info;
	struct s1d13xxxfb_pdata *pdata = NULL;
	int ret = 0;
	int i;
	u8 revision;

	dbg("probe called: device is %p\n", pdev);

	printk(KERN_INFO "Epson S1D13XXX FB Driver\n");

	/* enable platform-dependent hardware glue, if any */
	if (pdev->dev.platform_data)
		pdata = pdev->dev.platform_data;

	if (pdata && pdata->platform_init_video)
		pdata->platform_init_video();


	if (pdev->num_resources != 2) {
		dev_err(&pdev->dev, "invalid num_resources: %i\n",
		       pdev->num_resources);
		ret = -ENODEV;
		goto bail;
	}

	/* resource[0] is VRAM, resource[1] is registers */
	if (pdev->resource[0].flags != IORESOURCE_MEM
			|| pdev->resource[1].flags != IORESOURCE_MEM) {
		dev_err(&pdev->dev, "invalid resource type\n");
		ret = -ENODEV;
		goto bail;
	}

	if (!request_mem_region(pdev->resource[0].start,
		pdev->resource[0].end - pdev->resource[0].start +1, "s1d13xxxfb mem")) {
		dev_dbg(&pdev->dev, "request_mem_region failed\n");
		ret = -EBUSY;
		goto bail;
	}

	if (!request_mem_region(pdev->resource[1].start,
		pdev->resource[1].end - pdev->resource[1].start +1, "s1d13xxxfb regs")) {
		dev_dbg(&pdev->dev, "request_mem_region failed\n");
		ret = -EBUSY;
		goto bail;
	}

	info = framebuffer_alloc(sizeof(struct s1d13xxxfb_par) + sizeof(u32) * 256, &pdev->dev);
	if (!info) {
		ret = -ENOMEM;
		goto bail;
	}

	platform_set_drvdata(pdev, info);
	default_par = info->par;
	default_par->regs = ioremap_nocache(pdev->resource[1].start,
			pdev->resource[1].end - pdev->resource[1].start +1);
	if (!default_par->regs) {
		printk(KERN_ERR PFX "unable to map registers\n");
		ret = -ENOMEM;
		goto bail;
	}
	info->pseudo_palette = default_par->pseudo_palette;

	info->screen_base = ioremap_nocache(pdev->resource[0].start,
			pdev->resource[0].end - pdev->resource[0].start +1);

	if (!info->screen_base) {
		printk(KERN_ERR PFX "unable to map framebuffer\n");
		ret = -ENOMEM;
		goto bail;
	}

	revision = s1d13xxxfb_readreg(default_par, S1DREG_REV_CODE) >> 2;

	ret = -ENODEV;

	for (i = 0; i < ARRAY_SIZE(s1d13xxxfb_revisions); i++) {
		if (revision == s1d13xxxfb_revisions[i])
			ret = 0;
	}

	if (!ret)
		printk(KERN_INFO PFX "chip revision %i\n", revision);
	else {
		printk(KERN_INFO PFX "unknown chip revision %i\n", revision);
		goto bail;
	}

	info->fix = s1d13xxxfb_fix;
	info->fix.mmio_start = pdev->resource[1].start;
	info->fix.mmio_len = pdev->resource[1].end - pdev->resource[1].start +1;
	info->fix.smem_start = pdev->resource[0].start;
	info->fix.smem_len = pdev->resource[0].end - pdev->resource[0].start +1;

	printk(KERN_INFO PFX "regs mapped at 0x%p, fb %d KiB mapped at 0x%p\n",
	       default_par->regs, info->fix.smem_len / 1024, info->screen_base);

	info->par = default_par;
	info->fbops = &s1d13xxxfb_fbops;
	info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;

	/* perform "manual" chip initialization, if needed */
	if (pdata && pdata->initregs)
		s1d13xxxfb_runinit(info->par, pdata->initregs, pdata->initregssize);

	s1d13xxxfb_fetch_hw_state(info);

	if (register_framebuffer(info) < 0) {
		ret = -EINVAL;
		goto bail;
	}

	printk(KERN_INFO "fb%d: %s frame buffer device\n",
	       info->node, info->fix.id);

	return 0;

bail:
	s1d13xxxfb_remove(pdev);
	return ret;

}

#ifdef CONFIG_PM
static int s1d13xxxfb_suspend(struct platform_device *dev, pm_message_t state)
{
	struct fb_info *info = platform_get_drvdata(dev);
	struct s1d13xxxfb_par *s1dfb = info->par;
	struct s1d13xxxfb_pdata *pdata = NULL;

	/* disable display */
	lcd_enable(s1dfb, 0);
	crt_enable(s1dfb, 0);

	if (dev->dev.platform_data)
		pdata = dev->dev.platform_data;

#if 0
	if (!s1dfb->disp_save)
		s1dfb->disp_save = kmalloc(info->fix.smem_len, GFP_KERNEL);

	if (!s1dfb->disp_save) {
		printk(KERN_ERR PFX "no memory to save screen");
		return -ENOMEM;
	}

	memcpy_fromio(s1dfb->disp_save, info->screen_base, info->fix.smem_len);
#else
	s1dfb->disp_save = NULL;
#endif

	if (!s1dfb->regs_save)
		s1dfb->regs_save = kmalloc(info->fix.mmio_len, GFP_KERNEL);

	if (!s1dfb->regs_save) {
		printk(KERN_ERR PFX "no memory to save registers");
		return -ENOMEM;
	}

	/* backup all registers */
	memcpy_fromio(s1dfb->regs_save, s1dfb->regs, info->fix.mmio_len);

	/* now activate power save mode */
	s1d13xxxfb_writereg(s1dfb, S1DREG_PS_CNF, 0x11);

	if (pdata && pdata->platform_suspend_video)
		return pdata->platform_suspend_video();
	else
		return 0;
}

static int s1d13xxxfb_resume(struct platform_device *dev)
{
	struct fb_info *info = platform_get_drvdata(dev);
	struct s1d13xxxfb_par *s1dfb = info->par;
	struct s1d13xxxfb_pdata *pdata = NULL;

	/* awaken the chip */
	s1d13xxxfb_writereg(s1dfb, S1DREG_PS_CNF, 0x10);

	/* do not let go until SDRAM "wakes up" */
	while ((s1d13xxxfb_readreg(s1dfb, S1DREG_PS_STATUS) & 0x01))
		udelay(10);

	if (dev->dev.platform_data)
		pdata = dev->dev.platform_data;

	if (s1dfb->regs_save) {
		/* will write RO regs, *should* get away with it :) */
		memcpy_toio(s1dfb->regs, s1dfb->regs_save, info->fix.mmio_len);
		kfree(s1dfb->regs_save);
	}

	if (s1dfb->disp_save) {
		memcpy_toio(info->screen_base, s1dfb->disp_save,
				info->fix.smem_len);
		kfree(s1dfb->disp_save);	/* XXX kmalloc()'d when? */
	}

	if ((s1dfb->display & 0x01) != 0)
		lcd_enable(s1dfb, 1);
	if ((s1dfb->display & 0x02) != 0)
		crt_enable(s1dfb, 1);

	if (pdata && pdata->platform_resume_video)
		return pdata->platform_resume_video();
	else
		return 0;
}
#endif /* CONFIG_PM */

static struct platform_driver s1d13xxxfb_driver = {
	.probe		= s1d13xxxfb_probe,
	.remove		= s1d13xxxfb_remove,
#ifdef CONFIG_PM
	.suspend	= s1d13xxxfb_suspend,
	.resume		= s1d13xxxfb_resume,
#endif
	.driver		= {
		.name	= S1D_DEVICENAME,
	},
};


static int __init
s1d13xxxfb_init(void)
{

#ifndef MODULE
	if (fb_get_options("s1d13xxxfb", NULL))
		return -ENODEV;
#endif

	return platform_driver_register(&s1d13xxxfb_driver);
}


static void __exit
s1d13xxxfb_exit(void)
{
	platform_driver_unregister(&s1d13xxxfb_driver);
}

module_init(s1d13xxxfb_init);
module_exit(s1d13xxxfb_exit);


MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Framebuffer driver for S1D13xxx devices");
MODULE_AUTHOR("Ben Dooks <[e-mail]>, Thibaut VARENE <[e-mail]>");