[deliverable/linux.git] / drivers / video / vt8500lcdfb.c

/*
 *  linux/drivers/video/vt8500lcdfb.c
 *
 *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
 *
 * Based on skeletonfb.c and pxafb.c
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/wait.h>

#include "vt8500lcdfb.h"
#include "wmt_ge_rops.h"

#ifdef CONFIG_OF
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/memblock.h>
#endif


#define to_vt8500lcd_info(__info) container_of(__info, \
						struct vt8500lcd_info, fb)

static int vt8500lcd_set_par(struct fb_info *info)
{
	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
	int reg_bpp = 5; /* 16bpp */
	int i;
	unsigned long control0;

	if (!fbi)
		return -EINVAL;

	if (info->var.bits_per_pixel <= 8) {
		/* palettized */
		info->var.red.offset    = 0;
		info->var.red.length    = info->var.bits_per_pixel;
		info->var.red.msb_right = 0;

		info->var.green.offset  = 0;
		info->var.green.length  = info->var.bits_per_pixel;
		info->var.green.msb_right = 0;

		info->var.blue.offset   = 0;
		info->var.blue.length   = info->var.bits_per_pixel;
		info->var.blue.msb_right = 0;

		info->var.transp.offset = 0;
		info->var.transp.length = 0;
		info->var.transp.msb_right = 0;

		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		info->fix.line_length = info->var.xres_virtual /
						(8/info->var.bits_per_pixel);
	} else {
		/* non-palettized */
		info->var.transp.offset = 0;
		info->var.transp.length = 0;
		info->var.transp.msb_right = 0;

		if (info->var.bits_per_pixel == 16) {
			/* RGB565 */
			info->var.red.offset = 11;
			info->var.red.length = 5;
			info->var.red.msb_right = 0;
			info->var.green.offset = 5;
			info->var.green.length = 6;
			info->var.green.msb_right = 0;
			info->var.blue.offset = 0;
			info->var.blue.length = 5;
			info->var.blue.msb_right = 0;
		} else {
			/* Equal depths per channel */
			info->var.red.offset = info->var.bits_per_pixel
							* 2 / 3;
			info->var.red.length = info->var.bits_per_pixel / 3;
			info->var.red.msb_right = 0;
			info->var.green.offset = info->var.bits_per_pixel / 3;
			info->var.green.length = info->var.bits_per_pixel / 3;
			info->var.green.msb_right = 0;
			info->var.blue.offset = 0;
			info->var.blue.length = info->var.bits_per_pixel / 3;
			info->var.blue.msb_right = 0;
		}

		info->fix.visual = FB_VISUAL_TRUECOLOR;
		info->fix.line_length = info->var.bits_per_pixel > 16 ?
					info->var.xres_virtual << 2 :
					info->var.xres_virtual << 1;
	}

	for (i = 0; i < 8; i++) {
		if (bpp_values[i] == info->var.bits_per_pixel) {
			reg_bpp = i;
			continue;
		}
	}

	control0 = readl(fbi->regbase) & ~0xf;
	writel(0, fbi->regbase);
	while (readl(fbi->regbase + 0x38) & 0x10)
		/* wait */;
	writel((((info->var.hsync_len - 1) & 0x3f) << 26)
		| ((info->var.left_margin & 0xff) << 18)
		| (((info->var.xres - 1) & 0x3ff) << 8)
		| (info->var.right_margin & 0xff), fbi->regbase + 0x4);
	writel((((info->var.vsync_len - 1) & 0x3f) << 26)
		| ((info->var.upper_margin & 0xff) << 18)
		| (((info->var.yres - 1) & 0x3ff) << 8)
		| (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
	writel((((info->var.yres - 1) & 0x400) << 2)
		| ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
	writel(0x80000000, fbi->regbase + 0x20);
	writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase);

	return 0;
}

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

static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
			   unsigned blue, unsigned transp,
			   struct fb_info *info) {
	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
	int ret = 1;
	unsigned int val;
	if (regno >= 256)
		return -EINVAL;

	if (info->var.grayscale)
		red = green = blue =
			(19595 * red + 38470 * green + 7471 * blue) >> 16;

	switch (fbi->fb.fix.visual) {
	case FB_VISUAL_TRUECOLOR:
		if (regno < 16) {
			u32 *pal = fbi->fb.pseudo_palette;

			val  = chan_to_field(red, &fbi->fb.var.red);
			val |= chan_to_field(green, &fbi->fb.var.green);
			val |= chan_to_field(blue, &fbi->fb.var.blue);

			pal[regno] = val;
			ret = 0;
		}
		break;

	case FB_VISUAL_STATIC_PSEUDOCOLOR:
	case FB_VISUAL_PSEUDOCOLOR:
		writew((red & 0xf800)
		      | ((green >> 5) & 0x7e0)
		      | ((blue >> 11) & 0x1f),
		       fbi->palette_cpu + sizeof(u16) * regno);
		break;
	}

	return ret;
}

static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
			 unsigned long arg)
{
	int ret = 0;
	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);

	if (cmd == FBIO_WAITFORVSYNC) {
		/* Unmask End of Frame interrupt */
		writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
		ret = wait_event_interruptible_timeout(fbi->wait,
			readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
		/* Mask back to reduce unwanted interrupt traffic */
		writel(0xffffffff, fbi->regbase + 0x3c);
		if (ret < 0)
			return ret;
		if (ret == 0)
			return -ETIMEDOUT;
	}

	return ret;
}

static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
				struct fb_info *info)
{
	unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
	unsigned off = pixlen * var->xoffset
		      + info->fix.line_length * var->yoffset;
	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);

	writel((1 << 31)
	     | (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20)
	     | (off >> 2), fbi->regbase + 0x20);
	return 0;
}

/*
 * vt8500lcd_blank():
 *	Blank the display by setting all palette values to zero.  Note,
 * 	True Color modes do not really use the palette, so this will not
 *      blank the display in all modes.
 */
static int vt8500lcd_blank(int blank, struct fb_info *info)
{
	int i;

	switch (blank) {
	case FB_BLANK_POWERDOWN:
	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_HSYNC_SUSPEND:
	case FB_BLANK_NORMAL:
		if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
		    info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
			for (i = 0; i < 256; i++)
				vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
	case FB_BLANK_UNBLANK:
		if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
		    info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
			fb_set_cmap(&info->cmap, info);
	}
	return 0;
}

static struct fb_ops vt8500lcd_ops = {
	.owner		= THIS_MODULE,
	.fb_set_par	= vt8500lcd_set_par,
	.fb_setcolreg	= vt8500lcd_setcolreg,
	.fb_fillrect	= wmt_ge_fillrect,
	.fb_copyarea	= wmt_ge_copyarea,
	.fb_imageblit	= sys_imageblit,
	.fb_sync	= wmt_ge_sync,
	.fb_ioctl	= vt8500lcd_ioctl,
	.fb_pan_display	= vt8500lcd_pan_display,
	.fb_blank	= vt8500lcd_blank,
};

static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
{
	struct vt8500lcd_info *fbi = dev_id;

	if (readl(fbi->regbase + 0x38) & (1 << 3))
		wake_up_interruptible(&fbi->wait);

	writel(0xffffffff, fbi->regbase + 0x38);
	return IRQ_HANDLED;
}

static int vt8500lcd_probe(struct platform_device *pdev)
{
	struct vt8500lcd_info *fbi;
	struct resource *res;
	void *addr;
	int irq, ret;

	struct fb_videomode	of_mode;
	struct device_node	*np;
	u32			bpp;
	dma_addr_t fb_mem_phys;
	unsigned long fb_mem_len;
	void *fb_mem_virt;

	ret = -ENOMEM;
	fbi = NULL;

	fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info)
			+ sizeof(u32) * 16, GFP_KERNEL);
	if (!fbi) {
		dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
		ret = -ENOMEM;
		goto failed;
	}

	strcpy(fbi->fb.fix.id, "VT8500 LCD");

	fbi->fb.fix.type	= FB_TYPE_PACKED_PIXELS;
	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.vmode	= FB_VMODE_NONINTERLACED;

	fbi->fb.fbops		= &vt8500lcd_ops;
	fbi->fb.flags		= FBINFO_DEFAULT
				| FBINFO_HWACCEL_COPYAREA
				| FBINFO_HWACCEL_FILLRECT
				| FBINFO_HWACCEL_YPAN
				| FBINFO_VIRTFB
				| FBINFO_PARTIAL_PAN_OK;
	fbi->fb.node		= -1;

	addr = fbi;
	addr = addr + sizeof(struct vt8500lcd_info);
	fbi->fb.pseudo_palette	= addr;

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

	res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
	if (res == NULL) {
		dev_err(&pdev->dev, "failed to request I/O memory\n");
		ret = -EBUSY;
		goto failed_fbi;
	}

	fbi->regbase = ioremap(res->start, resource_size(res));
	if (fbi->regbase == NULL) {
		dev_err(&pdev->dev, "failed to map I/O memory\n");
		ret = -EBUSY;
		goto failed_free_res;
	}

	np = of_parse_phandle(pdev->dev.of_node, "default-mode", 0);
	if (!np) {
		pr_err("%s: No display description in Device Tree\n", __func__);
		ret = -EINVAL;
		goto failed_free_res;
	}

	/*
	 * This code is copied from Sascha Hauer's of_videomode helper
	 * and can be replaced with a call to the helper once mainlined
	 */
	ret = 0;
	ret |= of_property_read_u32(np, "hactive", &of_mode.xres);
	ret |= of_property_read_u32(np, "vactive", &of_mode.yres);
	ret |= of_property_read_u32(np, "hback-porch", &of_mode.left_margin);
	ret |= of_property_read_u32(np, "hfront-porch", &of_mode.right_margin);
	ret |= of_property_read_u32(np, "hsync-len", &of_mode.hsync_len);
	ret |= of_property_read_u32(np, "vback-porch", &of_mode.upper_margin);
	ret |= of_property_read_u32(np, "vfront-porch", &of_mode.lower_margin);
	ret |= of_property_read_u32(np, "vsync-len", &of_mode.vsync_len);
	ret |= of_property_read_u32(np, "bpp", &bpp);
	if (ret) {
		pr_err("%s: Unable to read display properties\n", __func__);
		goto failed_free_res;
	}
	of_mode.vmode = FB_VMODE_NONINTERLACED;

	/* try allocating the framebuffer */
	fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
	fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
				GFP_KERNEL);
	if (!fb_mem_virt) {
		pr_err("%s: Failed to allocate framebuffer\n", __func__);
		return -ENOMEM;
	};

	fbi->fb.fix.smem_start	= fb_mem_phys;
	fbi->fb.fix.smem_len	= fb_mem_len;
	fbi->fb.screen_base	= fb_mem_virt;

	fbi->palette_size	= PAGE_ALIGN(512);
	fbi->palette_cpu	= dma_alloc_coherent(&pdev->dev,
						     fbi->palette_size,
						     &fbi->palette_phys,
						     GFP_KERNEL);
	if (fbi->palette_cpu == NULL) {
		dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
		ret = -ENOMEM;
		goto failed_free_io;
	}

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

	ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi);
	if (ret) {
		dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
		ret = -EBUSY;
		goto failed_free_palette;
	}

	init_waitqueue_head(&fbi->wait);

	if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
		dev_err(&pdev->dev, "Failed to allocate color map\n");
		ret = -ENOMEM;
		goto failed_free_irq;
	}

	fb_videomode_to_var(&fbi->fb.var, &of_mode);

	fbi->fb.var.xres_virtual	= of_mode.xres;
	fbi->fb.var.yres_virtual	= of_mode.yres * 2;
	fbi->fb.var.bits_per_pixel	= bpp;

	ret = vt8500lcd_set_par(&fbi->fb);
	if (ret) {
		dev_err(&pdev->dev, "Failed to set parameters\n");
		goto failed_free_cmap;
	}

	writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
	writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);

	platform_set_drvdata(pdev, fbi);

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

	/*
	 * Ok, now enable the LCD controller
	 */
	writel(readl(fbi->regbase) | 1, fbi->regbase);

	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_palette:
	dma_free_coherent(&pdev->dev, fbi->palette_size,
			  fbi->palette_cpu, fbi->palette_phys);
failed_free_io:
	iounmap(fbi->regbase);
failed_free_res:
	release_mem_region(res->start, resource_size(res));
failed_fbi:
	platform_set_drvdata(pdev, NULL);
	kfree(fbi);
failed:
	return ret;
}

static int vt8500lcd_remove(struct platform_device *pdev)
{
	struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
	struct resource *res;
	int irq;

	unregister_framebuffer(&fbi->fb);

	writel(0, fbi->regbase);

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

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

	dma_free_coherent(&pdev->dev, fbi->palette_size,
			  fbi->palette_cpu, fbi->palette_phys);

	iounmap(fbi->regbase);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, resource_size(res));

	kfree(fbi);

	return 0;
}

static const struct of_device_id via_dt_ids[] = {
	{ .compatible = "via,vt8500-fb", },
	{}
};

static struct platform_driver vt8500lcd_driver = {
	.probe		= vt8500lcd_probe,
	.remove		= vt8500lcd_remove,
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "vt8500-lcd",
		.of_match_table = of_match_ptr(via_dt_ids),
	},
};

module_platform_driver(vt8500lcd_driver);

MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(of, via_dt_ids);
Commit	Line	Data
d6ff7d0f AC	1	/*
	2	* linux/drivers/video/vt8500lcdfb.c
	3	*
	4	* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
	5	*
	6	* Based on skeletonfb.c and pxafb.c
	7	*
	8	* This software is licensed under the terms of the GNU General Public
	9	* License version 2, as published by the Free Software Foundation, and
	10	* may be copied, distributed, and modified under those terms.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*/
	17
	18	#include <linux/module.h>
	19	#include <linux/kernel.h>
	20	#include <linux/errno.h>
	21	#include <linux/string.h>
	22	#include <linux/mm.h>
	23	#include <linux/slab.h>
	24	#include <linux/delay.h>
	25	#include <linux/fb.h>
	26	#include <linux/init.h>
	27	#include <linux/interrupt.h>
	28	#include <linux/io.h>
	29	#include <linux/dma-mapping.h>
	30	#include <linux/platform_device.h>
	31	#include <linux/wait.h>
	32
d6ff7d0f AC	33	#include "vt8500lcdfb.h"
	34	#include "wmt_ge_rops.h"
	35
e7b99537 TP	36	#ifdef CONFIG_OF
	37	#include <linux/of.h>
	38	#include <linux/of_fdt.h>
	39	#include <linux/memblock.h>
	40	#endif
	41
	42
d6ff7d0f AC	43	#define to_vt8500lcd_info(__info) container_of(__info, \
	44	struct vt8500lcd_info, fb)
	45
	46	static int vt8500lcd_set_par(struct fb_info *info)
	47	{
	48	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
	49	int reg_bpp = 5; /* 16bpp */
	50	int i;
	51	unsigned long control0;
	52
	53	if (!fbi)
	54	return -EINVAL;
	55
	56	if (info->var.bits_per_pixel <= 8) {
	57	/* palettized */
	58	info->var.red.offset = 0;
	59	info->var.red.length = info->var.bits_per_pixel;
	60	info->var.red.msb_right = 0;
	61
	62	info->var.green.offset = 0;
	63	info->var.green.length = info->var.bits_per_pixel;
	64	info->var.green.msb_right = 0;
	65
	66	info->var.blue.offset = 0;
	67	info->var.blue.length = info->var.bits_per_pixel;
	68	info->var.blue.msb_right = 0;
	69
	70	info->var.transp.offset = 0;
	71	info->var.transp.length = 0;
	72	info->var.transp.msb_right = 0;
	73
	74	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
	75	info->fix.line_length = info->var.xres_virtual /
	76	(8/info->var.bits_per_pixel);
	77	} else {
	78	/* non-palettized */
	79	info->var.transp.offset = 0;
	80	info->var.transp.length = 0;
	81	info->var.transp.msb_right = 0;
	82
	83	if (info->var.bits_per_pixel == 16) {
	84	/* RGB565 */
	85	info->var.red.offset = 11;
	86	info->var.red.length = 5;
	87	info->var.red.msb_right = 0;
	88	info->var.green.offset = 5;
	89	info->var.green.length = 6;
	90	info->var.green.msb_right = 0;
	91	info->var.blue.offset = 0;
	92	info->var.blue.length = 5;
	93	info->var.blue.msb_right = 0;
	94	} else {
	95	/* Equal depths per channel */
	96	info->var.red.offset = info->var.bits_per_pixel
	97	* 2 / 3;
	98	info->var.red.length = info->var.bits_per_pixel / 3;
	99	info->var.red.msb_right = 0;
	100	info->var.green.offset = info->var.bits_per_pixel / 3;
	101	info->var.green.length = info->var.bits_per_pixel / 3;
	102	info->var.green.msb_right = 0;
	103	info->var.blue.offset = 0;
	104	info->var.blue.length = info->var.bits_per_pixel / 3;
	105	info->var.blue.msb_right = 0;
	106	}
107
108	info->fix.visual = FB_VISUAL_TRUECOLOR;
109	info->fix.line_length = info->var.bits_per_pixel > 16 ?
110	info->var.xres_virtual << 2 :
111	info->var.xres_virtual << 1;
112	}
113
114	for (i = 0; i < 8; i++) {
115	if (bpp_values[i] == info->var.bits_per_pixel) {
116	reg_bpp = i;
117	continue;
118	}
119	}
120
121	control0 = readl(fbi->regbase) & ~0xf;
122	writel(0, fbi->regbase);
123	while (readl(fbi->regbase + 0x38) & 0x10)
124	/* wait */;
125	writel((((info->var.hsync_len - 1) & 0x3f) << 26)
126	\| ((info->var.left_margin & 0xff) << 18)
127	\| (((info->var.xres - 1) & 0x3ff) << 8)
128	\| (info->var.right_margin & 0xff), fbi->regbase + 0x4);
129	writel((((info->var.vsync_len - 1) & 0x3f) << 26)
130	\| ((info->var.upper_margin & 0xff) << 18)
131	\| (((info->var.yres - 1) & 0x3ff) << 8)
132	\| (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
133	writel((((info->var.yres - 1) & 0x400) << 2)
134	\| ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
135	writel(0x80000000, fbi->regbase + 0x20);
136	writel(control0 \| (reg_bpp << 1) \| 0x100, fbi->regbase);
137
138	return 0;
139	}
140
141	static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
142	{
143	chan &= 0xffff;
144	chan >>= 16 - bf->length;
145	return chan << bf->offset;
146	}
147
148	static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
149	unsigned blue, unsigned transp,
150	struct fb_info *info) {
151	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
152	int ret = 1;
153	unsigned int val;
154	if (regno >= 256)
155	return -EINVAL;
156
157	if (info->var.grayscale)
158	red = green = blue =
159	(19595 * red + 38470 * green + 7471 * blue) >> 16;
160
161	switch (fbi->fb.fix.visual) {
162	case FB_VISUAL_TRUECOLOR:
163	if (regno < 16) {
164	u32 *pal = fbi->fb.pseudo_palette;
165
166	val = chan_to_field(red, &fbi->fb.var.red);
167	val \|= chan_to_field(green, &fbi->fb.var.green);
168	val \|= chan_to_field(blue, &fbi->fb.var.blue);
169
170	pal[regno] = val;
171	ret = 0;
172	}
173	break;
174
175	case FB_VISUAL_STATIC_PSEUDOCOLOR:
176	case FB_VISUAL_PSEUDOCOLOR:
177	writew((red & 0xf800)
178	\| ((green >> 5) & 0x7e0)
179	\| ((blue >> 11) & 0x1f),
180	fbi->palette_cpu + sizeof(u16) * regno);
181	break;
182	}
183
184	return ret;
185	}
186
187	static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
188	unsigned long arg)
189	{
190	int ret = 0;
191	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
192
193	if (cmd == FBIO_WAITFORVSYNC) {
194	/* Unmask End of Frame interrupt */
195	writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
196	ret = wait_event_interruptible_timeout(fbi->wait,
197	readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
198	/* Mask back to reduce unwanted interrupt traffic */
199	writel(0xffffffff, fbi->regbase + 0x3c);
200	if (ret < 0)
201	return ret;
202	if (ret == 0)
203	return -ETIMEDOUT;
204	}
205
206	return ret;
207	}
208
209	static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
210	struct fb_info *info)
211	{
212	unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
213	unsigned off = pixlen * var->xoffset
214	+ info->fix.line_length * var->yoffset;
215	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
216
217	writel((1 << 31)
8f0246d6 LP	218	\| (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20)
8f0246d6 LP	219	\| (off >> 2), fbi->regbase + 0x20);
d6ff7d0f AC	220	return 0;
	221	}
	222
e41f1a98 AC	223	/*
	224	* vt8500lcd_blank():
	225	* Blank the display by setting all palette values to zero. Note,
	226	* True Color modes do not really use the palette, so this will not
	227	* blank the display in all modes.
	228	*/
	229	static int vt8500lcd_blank(int blank, struct fb_info *info)
	230	{
	231	int i;
	232
	233	switch (blank) {
	234	case FB_BLANK_POWERDOWN:
	235	case FB_BLANK_VSYNC_SUSPEND:
	236	case FB_BLANK_HSYNC_SUSPEND:
	237	case FB_BLANK_NORMAL:
	238	if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR \|\|
	239	info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
	240	for (i = 0; i < 256; i++)
	241	vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
	242	case FB_BLANK_UNBLANK:
	243	if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR \|\|
	244	info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
	245	fb_set_cmap(&info->cmap, info);
	246	}
	247	return 0;
	248	}
	249
d6ff7d0f AC	250	static struct fb_ops vt8500lcd_ops = {
	251	.owner = THIS_MODULE,
	252	.fb_set_par = vt8500lcd_set_par,
	253	.fb_setcolreg = vt8500lcd_setcolreg,
	254	.fb_fillrect = wmt_ge_fillrect,
	255	.fb_copyarea = wmt_ge_copyarea,
	256	.fb_imageblit = sys_imageblit,
	257	.fb_sync = wmt_ge_sync,
	258	.fb_ioctl = vt8500lcd_ioctl,
	259	.fb_pan_display = vt8500lcd_pan_display,
e41f1a98	260	.fb_blank = vt8500lcd_blank,
d6ff7d0f AC	261	};
	262
	263	static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
	264	{
	265	struct vt8500lcd_info *fbi = dev_id;
	266
	267	if (readl(fbi->regbase + 0x38) & (1 << 3))
	268	wake_up_interruptible(&fbi->wait);
	269
	270	writel(0xffffffff, fbi->regbase + 0x38);
	271	return IRQ_HANDLED;
	272	}
	273
48c68c4f	274	static int vt8500lcd_probe(struct platform_device *pdev)
d6ff7d0f AC	275	{
	276	struct vt8500lcd_info *fbi;
	277	struct resource *res;
d6ff7d0f AC	278	void *addr;
	279	int irq, ret;
	280
e7b99537 TP	281	struct fb_videomode of_mode;
	282	struct device_node *np;
	283	u32 bpp;
	284	dma_addr_t fb_mem_phys;
	285	unsigned long fb_mem_len;
	286	void *fb_mem_virt;
	287
d6ff7d0f AC	288	ret = -ENOMEM;
	289	fbi = NULL;
	290
e7b99537 TP	291	fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info)
e7b99537 TP	292	+ sizeof(u32) * 16, GFP_KERNEL);
d6ff7d0f AC	293	if (!fbi) {
	294	dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
	295	ret = -ENOMEM;
	296	goto failed;
	297	}
	298
	299	strcpy(fbi->fb.fix.id, "VT8500 LCD");
	300
	301	fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
	302	fbi->fb.fix.xpanstep = 0;
	303	fbi->fb.fix.ypanstep = 1;
	304	fbi->fb.fix.ywrapstep = 0;
	305	fbi->fb.fix.accel = FB_ACCEL_NONE;
	306
	307	fbi->fb.var.nonstd = 0;
	308	fbi->fb.var.activate = FB_ACTIVATE_NOW;
	309	fbi->fb.var.height = -1;
	310	fbi->fb.var.width = -1;
	311	fbi->fb.var.vmode = FB_VMODE_NONINTERLACED;
	312
	313	fbi->fb.fbops = &vt8500lcd_ops;
	314	fbi->fb.flags = FBINFO_DEFAULT
	315	\| FBINFO_HWACCEL_COPYAREA
	316	\| FBINFO_HWACCEL_FILLRECT
	317	\| FBINFO_HWACCEL_YPAN
	318	\| FBINFO_VIRTFB
	319	\| FBINFO_PARTIAL_PAN_OK;
	320	fbi->fb.node = -1;
	321
	322	addr = fbi;
	323	addr = addr + sizeof(struct vt8500lcd_info);
	324	fbi->fb.pseudo_palette = addr;
	325
	326	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	327	if (res == NULL) {
	328	dev_err(&pdev->dev, "no I/O memory resource defined\n");
	329	ret = -ENODEV;
	330	goto failed_fbi;
	331	}
	332
	333	res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
	334	if (res == NULL) {
	335	dev_err(&pdev->dev, "failed to request I/O memory\n");
	336	ret = -EBUSY;
	337	goto failed_fbi;
	338	}
	339
	340	fbi->regbase = ioremap(res->start, resource_size(res));
	341	if (fbi->regbase == NULL) {
	342	dev_err(&pdev->dev, "failed to map I/O memory\n");
	343	ret = -EBUSY;
	344	goto failed_free_res;
	345	}
	346
e7b99537 TP	347	np = of_parse_phandle(pdev->dev.of_node, "default-mode", 0);
	348	if (!np) {
	349	pr_err("%s: No display description in Device Tree\n", __func__);
	350	ret = -EINVAL;
	351	goto failed_free_res;
	352	}
	353
	354	/*
	355	* This code is copied from Sascha Hauer's of_videomode helper
	356	* and can be replaced with a call to the helper once mainlined
	357	*/
	358	ret = 0;
	359	ret \|= of_property_read_u32(np, "hactive", &of_mode.xres);
	360	ret \|= of_property_read_u32(np, "vactive", &of_mode.yres);
	361	ret \|= of_property_read_u32(np, "hback-porch", &of_mode.left_margin);
	362	ret \|= of_property_read_u32(np, "hfront-porch", &of_mode.right_margin);
	363	ret \|= of_property_read_u32(np, "hsync-len", &of_mode.hsync_len);
	364	ret \|= of_property_read_u32(np, "vback-porch", &of_mode.upper_margin);
	365	ret \|= of_property_read_u32(np, "vfront-porch", &of_mode.lower_margin);
	366	ret \|= of_property_read_u32(np, "vsync-len", &of_mode.vsync_len);
	367	ret \|= of_property_read_u32(np, "bpp", &bpp);
	368	if (ret) {
	369	pr_err("%s: Unable to read display properties\n", __func__);
	370	goto failed_free_res;
	371	}
	372	of_mode.vmode = FB_VMODE_NONINTERLACED;
	373
	374	/* try allocating the framebuffer */
	375	fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
	376	fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
	377	GFP_KERNEL);
	378	if (!fb_mem_virt) {
	379	pr_err("%s: Failed to allocate framebuffer\n", __func__);
	380	return -ENOMEM;
	381	};
	382
	383	fbi->fb.fix.smem_start = fb_mem_phys;
	384	fbi->fb.fix.smem_len = fb_mem_len;
	385	fbi->fb.screen_base = fb_mem_virt;
d6ff7d0f AC	386
	387	fbi->palette_size = PAGE_ALIGN(512);
	388	fbi->palette_cpu = dma_alloc_coherent(&pdev->dev,
	389	fbi->palette_size,
	390	&fbi->palette_phys,
	391	GFP_KERNEL);
	392	if (fbi->palette_cpu == NULL) {
	393	dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
	394	ret = -ENOMEM;
	395	goto failed_free_io;
	396	}
	397
	398	irq = platform_get_irq(pdev, 0);
	399	if (irq < 0) {
	400	dev_err(&pdev->dev, "no IRQ defined\n");
	401	ret = -ENODEV;
	402	goto failed_free_palette;
	403	}
	404
f8798ccb	405	ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi);
d6ff7d0f AC	406	if (ret) {
	407	dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
	408	ret = -EBUSY;
	409	goto failed_free_palette;
	410	}
	411
	412	init_waitqueue_head(&fbi->wait);
	413
	414	if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
	415	dev_err(&pdev->dev, "Failed to allocate color map\n");
	416	ret = -ENOMEM;
	417	goto failed_free_irq;
	418	}
	419
e7b99537 TP	420	fb_videomode_to_var(&fbi->fb.var, &of_mode);
	421
	422	fbi->fb.var.xres_virtual = of_mode.xres;
	423	fbi->fb.var.yres_virtual = of_mode.yres * 2;
	424	fbi->fb.var.bits_per_pixel = bpp;
d6ff7d0f AC	425
	426	ret = vt8500lcd_set_par(&fbi->fb);
	427	if (ret) {
	428	dev_err(&pdev->dev, "Failed to set parameters\n");
	429	goto failed_free_cmap;
	430	}
	431
	432	writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
	433	writel((fbi->palette_phys & 0xfffffe00) \| 1, fbi->regbase + 0x18);
	434
	435	platform_set_drvdata(pdev, fbi);
	436
	437	ret = register_framebuffer(&fbi->fb);
	438	if (ret < 0) {
	439	dev_err(&pdev->dev,
	440	"Failed to register framebuffer device: %d\n", ret);
	441	goto failed_free_cmap;
	442	}
	443
	444	/*
	445	* Ok, now enable the LCD controller
	446	*/
	447	writel(readl(fbi->regbase) \| 1, fbi->regbase);
	448
	449	return 0;
	450
	451	failed_free_cmap:
	452	if (fbi->fb.cmap.len)
	453	fb_dealloc_cmap(&fbi->fb.cmap);
	454	failed_free_irq:
	455	free_irq(irq, fbi);
	456	failed_free_palette:
	457	dma_free_coherent(&pdev->dev, fbi->palette_size,
	458	fbi->palette_cpu, fbi->palette_phys);
	459	failed_free_io:
	460	iounmap(fbi->regbase);
	461	failed_free_res:
	462	release_mem_region(res->start, resource_size(res));
	463	failed_fbi:
	464	platform_set_drvdata(pdev, NULL);
	465	kfree(fbi);
	466	failed:
	467	return ret;
	468	}
	469
48c68c4f	470	static int vt8500lcd_remove(struct platform_device *pdev)
d6ff7d0f AC	471	{
	472	struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
	473	struct resource *res;
	474	int irq;
	475
	476	unregister_framebuffer(&fbi->fb);
	477
	478	writel(0, fbi->regbase);
	479
	480	if (fbi->fb.cmap.len)
	481	fb_dealloc_cmap(&fbi->fb.cmap);
	482
	483	irq = platform_get_irq(pdev, 0);
	484	free_irq(irq, fbi);
	485
	486	dma_free_coherent(&pdev->dev, fbi->palette_size,
	487	fbi->palette_cpu, fbi->palette_phys);
	488
	489	iounmap(fbi->regbase);
	490
	491	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	492	release_mem_region(res->start, resource_size(res));
	493
	494	kfree(fbi);
	495
	496	return 0;
	497	}
	498
e7b99537 TP	499	static const struct of_device_id via_dt_ids[] = {
	500	{ .compatible = "via,vt8500-fb", },
	501	{}
	502	};
	503
d6ff7d0f AC	504	static struct platform_driver vt8500lcd_driver = {
d6ff7d0f AC	505	.probe = vt8500lcd_probe,
48c68c4f	506	.remove = vt8500lcd_remove,
d6ff7d0f AC	507	.driver = {
	508	.owner = THIS_MODULE,
	509	.name = "vt8500-lcd",
e7b99537	510	.of_match_table = of_match_ptr(via_dt_ids),
d6ff7d0f AC	511	},
	512	};
	513
4277f2c4	514	module_platform_driver(vt8500lcd_driver);
d6ff7d0f AC	515
	516	MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
	517	MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
e7b99537 TP	518	MODULE_LICENSE("GPL v2");
e7b99537 TP	519	MODULE_DEVICE_TABLE(of, via_dt_ids);