pxafb.c

Linux环境下视频显示卡设备的驱动程序源代码

		goto decode_mode;
	}

	if (lcd_conn == LCD_MONO_STN_8BPP)
		fbi->lccr0 |= LCCR0_DPD;

	fbi->lccr0 |= (lcd_conn & LCD_ALTERNATE_MAPPING) ? LCCR0_LDDALT : 0;

	fbi->lccr3 = LCCR3_Acb((inf->lcd_conn >> 10) & 0xff);
	fbi->lccr3 |= (lcd_conn & LCD_BIAS_ACTIVE_LOW) ? LCCR3_OEP : 0;
	fbi->lccr3 |= (lcd_conn & LCD_PCLK_EDGE_FALL)  ? LCCR3_PCP : 0;

decode_mode:
	pxafb_setmode(&fbi->fb.var, &inf->modes[0]);

	/* decide video memory size as follows:
	 * 1. default to mode of maximum resolution
	 * 2. allow platform to override
	 * 3. allow module parameter to override
	 */
	for (i = 0, m = &inf->modes[0]; i < inf->num_modes; i++, m++)
		fbi->video_mem_size = max_t(size_t, fbi->video_mem_size,
				m->xres * m->yres * m->bpp / 8);

	if (inf->video_mem_size > fbi->video_mem_size)
		fbi->video_mem_size = inf->video_mem_size;

	if (video_mem_size > fbi->video_mem_size)
		fbi->video_mem_size = video_mem_size;
}

static struct pxafb_info * __devinit pxafb_init_fbinfo(struct device *dev)
{
	struct pxafb_info *fbi;
	void *addr;
	struct pxafb_mach_info *inf = dev->platform_data;

	/* Alloc the pxafb_info and pseudo_palette in one step */
	fbi = kmalloc(sizeof(struct pxafb_info) + sizeof(u32) * 16, GFP_KERNEL);
	if (!fbi)
		return NULL;

	memset(fbi, 0, sizeof(struct pxafb_info));
	fbi->dev = dev;

	fbi->clk = clk_get(dev, NULL);
	if (IS_ERR(fbi->clk)) {
		kfree(fbi);
		return NULL;
	}

	strcpy(fbi->fb.fix.id, PXA_NAME);

	fbi->fb.fix.type	= FB_TYPE_PACKED_PIXELS;
	fbi->fb.fix.type_aux	= 0;
	fbi->fb.fix.xpanstep	= 0;
	fbi->fb.fix.ypanstep	= 1;
	fbi->fb.fix.ywrapstep	= 0;
	fbi->fb.fix.accel	= FB_ACCEL_NONE;

	fbi->fb.var.nonstd	= 0;
	fbi->fb.var.activate	= FB_ACTIVATE_NOW;
	fbi->fb.var.height	= -1;
	fbi->fb.var.width	= -1;
	fbi->fb.var.accel_flags	= FB_ACCELF_TEXT;
	fbi->fb.var.vmode	= FB_VMODE_NONINTERLACED;

	fbi->fb.fbops		= &pxafb_ops;
	fbi->fb.flags		= FBINFO_DEFAULT;
	fbi->fb.node		= -1;

	addr = fbi;
	addr = addr + sizeof(struct pxafb_info);
	fbi->fb.pseudo_palette	= addr;

	fbi->state		= C_STARTUP;
	fbi->task_state		= (u_char)-1;

	pxafb_decode_mach_info(fbi, inf);

	init_waitqueue_head(&fbi->ctrlr_wait);
	INIT_WORK(&fbi->task, pxafb_task);
	mutex_init(&fbi->ctrlr_lock);
	init_completion(&fbi->disable_done);

	return fbi;
}

#ifdef CONFIG_FB_PXA_PARAMETERS
static int __devinit parse_opt_mode(struct device *dev, const char *this_opt)
{
	struct pxafb_mach_info *inf = dev->platform_data;

	const char *name = this_opt+5;
	unsigned int namelen = strlen(name);
	int res_specified = 0, bpp_specified = 0;
	unsigned int xres = 0, yres = 0, bpp = 0;
	int yres_specified = 0;
	int i;
	for (i = namelen-1; i >= 0; i--) {
		switch (name[i]) {
		case '-':
			namelen = i;
			if (!bpp_specified && !yres_specified) {
				bpp = simple_strtoul(&name[i+1], NULL, 0);
				bpp_specified = 1;
			} else
				goto done;
			break;
		case 'x':
			if (!yres_specified) {
				yres = simple_strtoul(&name[i+1], NULL, 0);
				yres_specified = 1;
			} else
				goto done;
			break;
		case '0' ... '9':
			break;
		default:
			goto done;
		}
	}
	if (i < 0 && yres_specified) {
		xres = simple_strtoul(name, NULL, 0);
		res_specified = 1;
	}
done:
	if (res_specified) {
		dev_info(dev, "overriding resolution: %dx%d\n", xres, yres);
		inf->modes[0].xres = xres; inf->modes[0].yres = yres;
	}
	if (bpp_specified)
		switch (bpp) {
		case 1:
		case 2:
		case 4:
		case 8:
		case 16:
			inf->modes[0].bpp = bpp;
			dev_info(dev, "overriding bit depth: %d\n", bpp);
			break;
		default:
			dev_err(dev, "Depth %d is not valid\n", bpp);
			return -EINVAL;
		}
	return 0;
}

static int __devinit parse_opt(struct device *dev, char *this_opt)
{
	struct pxafb_mach_info *inf = dev->platform_data;
	struct pxafb_mode_info *mode = &inf->modes[0];
	char s[64];

	s[0] = '\0';

	if (!strncmp(this_opt, "vmem:", 5)) {
		video_mem_size = memparse(this_opt + 5, NULL);
	} else if (!strncmp(this_opt, "mode:", 5)) {
		return parse_opt_mode(dev, this_opt);
	} else if (!strncmp(this_opt, "pixclock:", 9)) {
		mode->pixclock = simple_strtoul(this_opt+9, NULL, 0);
		sprintf(s, "pixclock: %ld\n", mode->pixclock);
	} else if (!strncmp(this_opt, "left:", 5)) {
		mode->left_margin = simple_strtoul(this_opt+5, NULL, 0);
		sprintf(s, "left: %u\n", mode->left_margin);
	} else if (!strncmp(this_opt, "right:", 6)) {
		mode->right_margin = simple_strtoul(this_opt+6, NULL, 0);
		sprintf(s, "right: %u\n", mode->right_margin);
	} else if (!strncmp(this_opt, "upper:", 6)) {
		mode->upper_margin = simple_strtoul(this_opt+6, NULL, 0);
		sprintf(s, "upper: %u\n", mode->upper_margin);
	} else if (!strncmp(this_opt, "lower:", 6)) {
		mode->lower_margin = simple_strtoul(this_opt+6, NULL, 0);
		sprintf(s, "lower: %u\n", mode->lower_margin);
	} else if (!strncmp(this_opt, "hsynclen:", 9)) {
		mode->hsync_len = simple_strtoul(this_opt+9, NULL, 0);
		sprintf(s, "hsynclen: %u\n", mode->hsync_len);
	} else if (!strncmp(this_opt, "vsynclen:", 9)) {
		mode->vsync_len = simple_strtoul(this_opt+9, NULL, 0);
		sprintf(s, "vsynclen: %u\n", mode->vsync_len);
	} else if (!strncmp(this_opt, "hsync:", 6)) {
		if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
			sprintf(s, "hsync: Active Low\n");
			mode->sync &= ~FB_SYNC_HOR_HIGH_ACT;
		} else {
			sprintf(s, "hsync: Active High\n");
			mode->sync |= FB_SYNC_HOR_HIGH_ACT;
		}
	} else if (!strncmp(this_opt, "vsync:", 6)) {
		if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
			sprintf(s, "vsync: Active Low\n");
			mode->sync &= ~FB_SYNC_VERT_HIGH_ACT;
		} else {
			sprintf(s, "vsync: Active High\n");
			mode->sync |= FB_SYNC_VERT_HIGH_ACT;
		}
	} else if (!strncmp(this_opt, "dpc:", 4)) {
		if (simple_strtoul(this_opt+4, NULL, 0) == 0) {
			sprintf(s, "double pixel clock: false\n");
			inf->lccr3 &= ~LCCR3_DPC;
		} else {
			sprintf(s, "double pixel clock: true\n");
			inf->lccr3 |= LCCR3_DPC;
		}
	} else if (!strncmp(this_opt, "outputen:", 9)) {
		if (simple_strtoul(this_opt+9, NULL, 0) == 0) {
			sprintf(s, "output enable: active low\n");
			inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnL;
		} else {
			sprintf(s, "output enable: active high\n");
			inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnH;
		}
	} else if (!strncmp(this_opt, "pixclockpol:", 12)) {
		if (simple_strtoul(this_opt+12, NULL, 0) == 0) {
			sprintf(s, "pixel clock polarity: falling edge\n");
			inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixFlEdg;
		} else {
			sprintf(s, "pixel clock polarity: rising edge\n");
			inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixRsEdg;
		}
	} else if (!strncmp(this_opt, "color", 5)) {
		inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Color;
	} else if (!strncmp(this_opt, "mono", 4)) {
		inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Mono;
	} else if (!strncmp(this_opt, "active", 6)) {
		inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Act;
	} else if (!strncmp(this_opt, "passive", 7)) {
		inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Pas;
	} else if (!strncmp(this_opt, "single", 6)) {
		inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Sngl;
	} else if (!strncmp(this_opt, "dual", 4)) {
		inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Dual;
	} else if (!strncmp(this_opt, "4pix", 4)) {
		inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_4PixMono;
	} else if (!strncmp(this_opt, "8pix", 4)) {
		inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_8PixMono;
	} else {
		dev_err(dev, "unknown option: %s\n", this_opt);
		return -EINVAL;
	}

	if (s[0] != '\0')
		dev_info(dev, "override %s", s);

	return 0;
}

static int __devinit pxafb_parse_options(struct device *dev, char *options)
{
	char *this_opt;
	int ret;

	if (!options || !*options)
		return 0;

	dev_dbg(dev, "options are \"%s\"\n", options ? options : "null");

	/* could be made table driven or similar?... */
	while ((this_opt = strsep(&options, ",")) != NULL) {
		ret = parse_opt(dev, this_opt);
		if (ret)
			return ret;
	}
	return 0;
}

static char g_options[256] __devinitdata = "";

#ifndef MODULE
static int __init pxafb_setup_options(void)
{
	char *options = NULL;

	if (fb_get_options("pxafb", &options))
		return -ENODEV;

	if (options)
		strlcpy(g_options, options, sizeof(g_options));

	return 0;
}
#else
#define pxafb_setup_options()		(0)

module_param_string(options, g_options, sizeof(g_options), 0);
MODULE_PARM_DESC(options, "LCD parameters (see Documentation/fb/pxafb.txt)");
#endif

#else
#define pxafb_parse_options(...)	(0)
#define pxafb_setup_options()		(0)
#endif

#ifdef DEBUG_VAR
/* Check for various illegal bit-combinations. Currently only
 * a warning is given. */
static void __devinit pxafb_check_options(struct device *dev,
					  struct pxafb_mach_info *inf)
{
	if (inf->lcd_conn)
		return;

	if (inf->lccr0 & LCCR0_INVALID_CONFIG_MASK)
		dev_warn(dev, "machine LCCR0 setting contains "
				"illegal bits: %08x\n",
			inf->lccr0 & LCCR0_INVALID_CONFIG_MASK);
	if (inf->lccr3 & LCCR3_INVALID_CONFIG_MASK)
		dev_warn(dev, "machine LCCR3 setting contains "
				"illegal bits: %08x\n",
			inf->lccr3 & LCCR3_INVALID_CONFIG_MASK);
	if (inf->lccr0 & LCCR0_DPD &&
	    ((inf->lccr0 & LCCR0_PAS) != LCCR0_Pas ||
	     (inf->lccr0 & LCCR0_SDS) != LCCR0_Sngl ||
	     (inf->lccr0 & LCCR0_CMS) != LCCR0_Mono))
		dev_warn(dev, "Double Pixel Data (DPD) mode is "
				"only valid in passive mono"
				" single panel mode\n");
	if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Act &&
	    (inf->lccr0 & LCCR0_SDS) == LCCR0_Dual)
		dev_warn(dev, "Dual panel only valid in passive mode\n");
	if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Pas &&
	     (inf->modes->upper_margin || inf->modes->lower_margin))
		dev_warn(dev, "Upper and lower margins must be 0 in "
				"passive mode\n");
}
#else
#define pxafb_check_options(...)	do {} while (0)
#endif

static int __devinit pxafb_probe(struct platform_device *dev)
{
	struct pxafb_info *fbi;
	struct pxafb_mach_info *inf;
	struct resource *r;
	int irq, ret;

	dev_dbg(&dev->dev, "pxafb_probe\n");

	inf = dev->dev.platform_data;
	ret = -ENOMEM;
	fbi = NULL;
	if (!inf)
		goto failed;

	ret = pxafb_parse_options(&dev->dev, g_options);
	if (ret < 0)
		goto failed;

	pxafb_check_options(&dev->dev, inf);

	dev_dbg(&dev->dev, "got a %dx%dx%d LCD\n",
			inf->modes->xres,
			inf->modes->yres,
			inf->modes->bpp);
	if (inf->modes->xres == 0 ||
	    inf->modes->yres == 0 ||
	    inf->modes->bpp == 0) {
		dev_err(&dev->dev, "Invalid resolution or bit depth\n");
		ret = -EINVAL;
		goto failed;
	}

	fbi = pxafb_init_fbinfo(&dev->dev);
	if (!fbi) {
		/* only reason for pxafb_init_fbinfo to fail is kmalloc */
		dev_err(&dev->dev, "Failed to initialize framebuffer device\n");
		ret = -ENOMEM;
		goto failed;
	}

	fbi->backlight_power = inf->pxafb_backlight_power;
	fbi->lcd_power = inf->pxafb_lcd_power;

	r = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (r == NULL) {
		dev_err(&dev->dev, "no I/O memory resource defined\n");
		ret = -ENODEV;
		goto failed_fbi;
	}

	r = request_mem_region(r->start, r->end - r->start + 1, dev->name);
	if (r == NULL) {
		dev_err(&dev->dev, "failed to request I/O memory\n");
		ret = -EBUSY;
		goto failed_fbi;
	}

	fbi->mmio_base = ioremap(r->start, r->end - r->start + 1);
	if (fbi->mmio_base == NULL) {
		dev_err(&dev->dev, "failed to map I/O memory\n");
		ret = -EBUSY;
		goto failed_free_res;
	}

	fbi->dma_buff_size = PAGE_ALIGN(sizeof(struct pxafb_dma_buff));
	fbi->dma_buff = dma_alloc_coherent(fbi->dev, fbi->dma_buff_size,
				&fbi->dma_buff_phys, GFP_KERNEL);
	if (fbi->dma_buff == NULL) {
		dev_err(&dev->dev, "failed to allocate memory for DMA\n");
		ret = -ENOMEM;
		goto failed_free_io;
	}

	ret = pxafb_init_video_memory(fbi);
	if (ret) {
		dev_err(&dev->dev, "Failed to allocate video RAM: %d\n", ret);
		ret = -ENOMEM;
		goto failed_free_dma;
	}

	irq = platform_get_irq(dev, 0);
	if (irq < 0) {
		dev_err(&dev->dev, "no IRQ defined\n");
		ret = -ENODEV;
		goto failed_free_mem;
	}

	ret = request_irq(irq, pxafb_handle_irq, IRQF_DISABLED, "LCD", fbi);
	if (ret) {
		dev_err(&dev->dev, "request_irq failed: %d\n", ret);
		ret = -EBUSY;
		goto failed_free_mem;
	}

	ret = pxafb_smart_init(fbi);
	if (ret) {
		dev_err(&dev->dev, "failed to initialize smartpanel\n");
		goto failed_free_irq;
	}

	/*
	 * This makes sure that our colour bitfield
	 * descriptors are correctly initialised.
	 */
	ret = pxafb_check_var(&fbi->fb.var, &fbi->fb);
	if (ret) {
		dev_err(&dev->dev, "failed to get suitable mode\n");
		goto failed_free_irq;
	}

	ret = pxafb_set_par(&fbi->fb);
	if (ret) {
		dev_err(&dev->dev, "Failed to set parameters\n");
		goto failed_free_irq;
	}

	platform_set_drvdata(dev, fbi);

	ret = register_framebuffer(&fbi->fb);
	if (ret < 0) {
		dev_err(&dev->dev,
			"Failed to register framebuffer device: %d\n", ret);
		goto failed_free_cmap;
	}

	pxafb_overlay_init(fbi);

#ifdef CONFIG_CPU_FREQ
	fbi->freq_transition.notifier_call = pxafb_freq_transition;
	fbi->freq_policy.notifier_call = pxafb_freq_policy;
	cpufreq_register_notifier(&fbi->freq_transition,
				CPUFREQ_TRANSITION_NOTIFIER);
	cpufreq_register_notifier(&fbi->freq_policy,
				CPUFREQ_POLICY_NOTIFIER);
#endif

	/*
	 * Ok, now enable the LCD controller
	 */
	set_ctrlr_state(fbi, C_ENABLE);

	return 0;

failed_free_cmap:
	if (fbi->fb.cmap.len)
		fb_dealloc_cmap(&fbi->fb.cmap);
failed_free_irq:
	free_irq(irq, fbi);
failed_free_mem:
	free_pages_exact(fbi->video_mem, fbi->video_mem_size);
failed_free_dma:
	dma_free_coherent(&dev->dev, fbi->dma_buff_size,
			fbi->dma_buff, fbi->dma_buff_phys);
failed_free_io:
	iounmap(fbi->mmio_base);
failed_free_res:
	release_mem_region(r->start, r->end - r->start + 1);
failed_fbi:
	clk_put(fbi->clk);
	platform_set_drvdata(dev, NULL);
	kfree(fbi);
failed:
	return ret;
}

static int __devexit pxafb_remove(struct platform_device *dev)
{
	struct pxafb_info *fbi = platform_get_drvdata(dev);
	struct resource *r;
	int irq;
	struct fb_info *info;

	if (!fbi)
		return 0;

	info = &fbi->fb;

	pxafb_overlay_exit(fbi);
	unregister_framebuffer(info);

	pxafb_disable_controller(fbi);

	if (fbi->fb.cmap.len)
		fb_dealloc_cmap(&fbi->fb.cmap);

	irq = platform_get_irq(dev, 0);
	free_irq(irq, fbi);

	free_pages_exact(fbi->video_mem, fbi->video_mem_size);

	dma_free_writecombine(&dev->dev, fbi->dma_buff_size,
			fbi->dma_buff, fbi->dma_buff_phys);

	iounmap(fbi->mmio_base);

	r = platform_get_resource(dev, IORESOURCE_MEM, 0);
	release_mem_region(r->start, r->end - r->start + 1);

	clk_put(fbi->clk);
	kfree(fbi);

	return 0;
}

static struct platform_driver pxafb_driver = {
	.probe		= pxafb_probe,
	.remove 	= __devexit_p(pxafb_remove),
	.suspend	= pxafb_suspend,
	.resume		= pxafb_resume,
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "pxa2xx-fb",
	},
};

static int __init pxafb_init(void)
{
	if (pxafb_setup_options())
		return -EINVAL;

	return platform_driver_register(&pxafb_driver);
}

static void __exit pxafb_exit(void)
{
	platform_driver_unregister(&pxafb_driver);
}

module_init(pxafb_init);
module_exit(pxafb_exit);

MODULE_DESCRIPTION("loadable framebuffer driver for PXA");
MODULE_LICENSE("GPL");