[linux-2.6-block.git] / drivers / video / fbdev / 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/delay.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/wait.h>
#include <video/of_display_timing.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;
	}

	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;
	struct display_timings *disp_timing;
	void *addr;
	int irq, ret;

	struct fb_videomode	of_mode;
	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)
		return -ENOMEM;

	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");
		return -ENODEV;
	}

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

	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;
	}

	disp_timing = of_get_display_timings(pdev->dev.of_node);
	if (!disp_timing) {
		ret = -EINVAL;
		goto failed_free_io;
	}

	ret = of_get_fb_videomode(pdev->dev.of_node, &of_mode,
							OF_USE_NATIVE_MODE);
	if (ret)
		goto failed_free_io;

	ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
	if (ret)
		goto failed_free_io;

	/* 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__);
		ret = -ENOMEM;
		goto failed_free_io;
	}

	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));
	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));

	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		= {
		.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
d6ff7d0f	18	#include <linux/delay.h>
7ab0a484 TP	19	#include <linux/dma-mapping.h>
7ab0a484 TP	20	#include <linux/errno.h>
d6ff7d0f AC	21	#include <linux/fb.h>
	22	#include <linux/init.h>
	23	#include <linux/interrupt.h>
	24	#include <linux/io.h>
7ab0a484 TP	25	#include <linux/kernel.h>
	26	#include <linux/mm.h>
	27	#include <linux/module.h>
d6ff7d0f	28	#include <linux/platform_device.h>
7ab0a484 TP	29	#include <linux/slab.h>
7ab0a484 TP	30	#include <linux/string.h>
d6ff7d0f	31	#include <linux/wait.h>
7ab0a484	32	#include <video/of_display_timing.h>
d6ff7d0f	33
d6ff7d0f AC	34	#include "vt8500lcdfb.h"
	35	#include "wmt_ge_rops.h"
	36
e7b99537 TP	37	#ifdef CONFIG_OF
	38	#include <linux/of.h>
	39	#include <linux/of_fdt.h>
	40	#include <linux/memblock.h>
	41	#endif
	42
	43
d6ff7d0f AC	44	#define to_vt8500lcd_info(__info) container_of(__info, \
	45	struct vt8500lcd_info, fb)
	46
	47	static int vt8500lcd_set_par(struct fb_info *info)
	48	{
	49	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
	50	int reg_bpp = 5; /* 16bpp */
	51	int i;
	52	unsigned long control0;
	53
	54	if (!fbi)
	55	return -EINVAL;
	56
	57	if (info->var.bits_per_pixel <= 8) {
	58	/* palettized */
	59	info->var.red.offset = 0;
	60	info->var.red.length = info->var.bits_per_pixel;
	61	info->var.red.msb_right = 0;
	62
	63	info->var.green.offset = 0;
	64	info->var.green.length = info->var.bits_per_pixel;
	65	info->var.green.msb_right = 0;
	66
	67	info->var.blue.offset = 0;
	68	info->var.blue.length = info->var.bits_per_pixel;
	69	info->var.blue.msb_right = 0;
	70
	71	info->var.transp.offset = 0;
	72	info->var.transp.length = 0;
	73	info->var.transp.msb_right = 0;
	74
	75	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
	76	info->fix.line_length = info->var.xres_virtual /
	77	(8/info->var.bits_per_pixel);
	78	} else {
	79	/* non-palettized */
	80	info->var.transp.offset = 0;
	81	info->var.transp.length = 0;
	82	info->var.transp.msb_right = 0;
	83
	84	if (info->var.bits_per_pixel == 16) {
	85	/* RGB565 */
	86	info->var.red.offset = 11;
	87	info->var.red.length = 5;
	88	info->var.red.msb_right = 0;
	89	info->var.green.offset = 5;
	90	info->var.green.length = 6;
	91	info->var.green.msb_right = 0;
	92	info->var.blue.offset = 0;
	93	info->var.blue.length = 5;
	94	info->var.blue.msb_right = 0;
	95	} else {
	96	/* Equal depths per channel */
	97	info->var.red.offset = info->var.bits_per_pixel
	98	* 2 / 3;
	99	info->var.red.length = info->var.bits_per_pixel / 3;
	100	info->var.red.msb_right = 0;
	101	info->var.green.offset = info->var.bits_per_pixel / 3;
	102	info->var.green.length = info->var.bits_per_pixel / 3;
	103	info->var.green.msb_right = 0;
	104	info->var.blue.offset = 0;
	105	info->var.blue.length = info->var.bits_per_pixel / 3;
	106	info->var.blue.msb_right = 0;
	107	}
108
109	info->fix.visual = FB_VISUAL_TRUECOLOR;
110	info->fix.line_length = info->var.bits_per_pixel > 16 ?
111	info->var.xres_virtual << 2 :
112	info->var.xres_virtual << 1;
113	}
114
115	for (i = 0; i < 8; i++) {
0fc50517	116	if (bpp_values[i] == info->var.bits_per_pixel)
d6ff7d0f	117	reg_bpp = i;
d6ff7d0f AC	118	}
	119
	120	control0 = readl(fbi->regbase) & ~0xf;
	121	writel(0, fbi->regbase);
	122	while (readl(fbi->regbase + 0x38) & 0x10)
	123	/* wait */;
	124	writel((((info->var.hsync_len - 1) & 0x3f) << 26)
	125	\| ((info->var.left_margin & 0xff) << 18)
	126	\| (((info->var.xres - 1) & 0x3ff) << 8)
	127	\| (info->var.right_margin & 0xff), fbi->regbase + 0x4);
	128	writel((((info->var.vsync_len - 1) & 0x3f) << 26)
	129	\| ((info->var.upper_margin & 0xff) << 18)
	130	\| (((info->var.yres - 1) & 0x3ff) << 8)
	131	\| (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
	132	writel((((info->var.yres - 1) & 0x400) << 2)
	133	\| ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
	134	writel(0x80000000, fbi->regbase + 0x20);
	135	writel(control0 \| (reg_bpp << 1) \| 0x100, fbi->regbase);
	136
	137	return 0;
	138	}
	139
	140	static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
	141	{
	142	chan &= 0xffff;
	143	chan >>= 16 - bf->length;
	144	return chan << bf->offset;
	145	}
	146
	147	static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
	148	unsigned blue, unsigned transp,
	149	struct fb_info *info) {
	150	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
	151	int ret = 1;
	152	unsigned int val;
	153	if (regno >= 256)
	154	return -EINVAL;
	155
	156	if (info->var.grayscale)
	157	red = green = blue =
	158	(19595 * red + 38470 * green + 7471 * blue) >> 16;
	159
	160	switch (fbi->fb.fix.visual) {
	161	case FB_VISUAL_TRUECOLOR:
	162	if (regno < 16) {
	163	u32 *pal = fbi->fb.pseudo_palette;
	164
	165	val = chan_to_field(red, &fbi->fb.var.red);
	166	val \|= chan_to_field(green, &fbi->fb.var.green);
	167	val \|= chan_to_field(blue, &fbi->fb.var.blue);
	168
	169	pal[regno] = val;
	170	ret = 0;
	171	}
	172	break;
	173
	174	case FB_VISUAL_STATIC_PSEUDOCOLOR:
	175	case FB_VISUAL_PSEUDOCOLOR:
	176	writew((red & 0xf800)
	177	\| ((green >> 5) & 0x7e0)
	178	\| ((blue >> 11) & 0x1f),
	179	fbi->palette_cpu + sizeof(u16) * regno);
	180	break;
	181	}
182
183	return ret;
184	}
185
186	static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
187	unsigned long arg)
188	{
189	int ret = 0;
190	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
191
192	if (cmd == FBIO_WAITFORVSYNC) {
193	/* Unmask End of Frame interrupt */
194	writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
195	ret = wait_event_interruptible_timeout(fbi->wait,
196	readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
197	/* Mask back to reduce unwanted interrupt traffic */
198	writel(0xffffffff, fbi->regbase + 0x3c);
199	if (ret < 0)
200	return ret;
201	if (ret == 0)
202	return -ETIMEDOUT;
203	}
204
205	return ret;
206	}
207
208	static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
209	struct fb_info *info)
210	{
211	unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
212	unsigned off = pixlen * var->xoffset
213	+ info->fix.line_length * var->yoffset;
214	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
215
216	writel((1 << 31)
8f0246d6 LP	217	\| (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20)
8f0246d6 LP	218	\| (off >> 2), fbi->regbase + 0x20);
d6ff7d0f AC	219	return 0;
	220	}
	221
e41f1a98 AC	222	/*
	223	* vt8500lcd_blank():
	224	* Blank the display by setting all palette values to zero. Note,
	225	* True Color modes do not really use the palette, so this will not
	226	* blank the display in all modes.
	227	*/
	228	static int vt8500lcd_blank(int blank, struct fb_info *info)
	229	{
	230	int i;
	231
	232	switch (blank) {
	233	case FB_BLANK_POWERDOWN:
	234	case FB_BLANK_VSYNC_SUSPEND:
	235	case FB_BLANK_HSYNC_SUSPEND:
	236	case FB_BLANK_NORMAL:
	237	if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR \|\|
	238	info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
	239	for (i = 0; i < 256; i++)
	240	vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
	241	case FB_BLANK_UNBLANK:
	242	if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR \|\|
	243	info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
	244	fb_set_cmap(&info->cmap, info);
	245	}
	246	return 0;
	247	}
	248
d6ff7d0f AC	249	static struct fb_ops vt8500lcd_ops = {
	250	.owner = THIS_MODULE,
	251	.fb_set_par = vt8500lcd_set_par,
	252	.fb_setcolreg = vt8500lcd_setcolreg,
	253	.fb_fillrect = wmt_ge_fillrect,
	254	.fb_copyarea = wmt_ge_copyarea,
	255	.fb_imageblit = sys_imageblit,
	256	.fb_sync = wmt_ge_sync,
	257	.fb_ioctl = vt8500lcd_ioctl,
	258	.fb_pan_display = vt8500lcd_pan_display,
e41f1a98	259	.fb_blank = vt8500lcd_blank,
d6ff7d0f AC	260	};
	261
	262	static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
	263	{
	264	struct vt8500lcd_info *fbi = dev_id;
	265
	266	if (readl(fbi->regbase + 0x38) & (1 << 3))
	267	wake_up_interruptible(&fbi->wait);
	268
	269	writel(0xffffffff, fbi->regbase + 0x38);
	270	return IRQ_HANDLED;
	271	}
	272
48c68c4f	273	static int vt8500lcd_probe(struct platform_device *pdev)
d6ff7d0f AC	274	{
	275	struct vt8500lcd_info *fbi;
	276	struct resource *res;
7ab0a484	277	struct display_timings *disp_timing;
d6ff7d0f AC	278	void *addr;
	279	int irq, ret;
	280
e7b99537	281	struct fb_videomode of_mode;
e7b99537 TP	282	u32 bpp;
	283	dma_addr_t fb_mem_phys;
	284	unsigned long fb_mem_len;
	285	void *fb_mem_virt;
	286
d6ff7d0f AC	287	ret = -ENOMEM;
	288	fbi = NULL;
	289
e7b99537 TP	290	fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info)
e7b99537 TP	291	+ sizeof(u32) * 16, GFP_KERNEL);
d33a7ee9	292	if (!fbi)
46ac2956	293	return -ENOMEM;
d6ff7d0f AC	294
	295	strcpy(fbi->fb.fix.id, "VT8500 LCD");
	296
	297	fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
	298	fbi->fb.fix.xpanstep = 0;
	299	fbi->fb.fix.ypanstep = 1;
	300	fbi->fb.fix.ywrapstep = 0;
	301	fbi->fb.fix.accel = FB_ACCEL_NONE;
	302
	303	fbi->fb.var.nonstd = 0;
	304	fbi->fb.var.activate = FB_ACTIVATE_NOW;
	305	fbi->fb.var.height = -1;
	306	fbi->fb.var.width = -1;
	307	fbi->fb.var.vmode = FB_VMODE_NONINTERLACED;
	308
	309	fbi->fb.fbops = &vt8500lcd_ops;
	310	fbi->fb.flags = FBINFO_DEFAULT
	311	\| FBINFO_HWACCEL_COPYAREA
	312	\| FBINFO_HWACCEL_FILLRECT
	313	\| FBINFO_HWACCEL_YPAN
	314	\| FBINFO_VIRTFB
	315	\| FBINFO_PARTIAL_PAN_OK;
	316	fbi->fb.node = -1;
	317
	318	addr = fbi;
	319	addr = addr + sizeof(struct vt8500lcd_info);
	320	fbi->fb.pseudo_palette = addr;
	321
	322	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	323	if (res == NULL) {
	324	dev_err(&pdev->dev, "no I/O memory resource defined\n");
46ac2956	325	return -ENODEV;
d6ff7d0f AC	326	}
	327
	328	res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
	329	if (res == NULL) {
	330	dev_err(&pdev->dev, "failed to request I/O memory\n");
46ac2956	331	return -EBUSY;
d6ff7d0f AC	332	}
	333
	334	fbi->regbase = ioremap(res->start, resource_size(res));
	335	if (fbi->regbase == NULL) {
	336	dev_err(&pdev->dev, "failed to map I/O memory\n");
	337	ret = -EBUSY;
	338	goto failed_free_res;
	339	}
	340
7ab0a484	341	disp_timing = of_get_display_timings(pdev->dev.of_node);
46ac2956 DC	342	if (!disp_timing) {
	343	ret = -EINVAL;
	344	goto failed_free_io;
	345	}
e7b99537	346
7ab0a484 TP	347	ret = of_get_fb_videomode(pdev->dev.of_node, &of_mode,
	348	OF_USE_NATIVE_MODE);
	349	if (ret)
46ac2956	350	goto failed_free_io;
7ab0a484 TP	351
	352	ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
	353	if (ret)
46ac2956	354	goto failed_free_io;
e7b99537 TP	355
	356	/* try allocating the framebuffer */
	357	fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
	358	fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
	359	GFP_KERNEL);
	360	if (!fb_mem_virt) {
	361	pr_err("%s: Failed to allocate framebuffer\n", __func__);
46ac2956 DC	362	ret = -ENOMEM;
46ac2956 DC	363	goto failed_free_io;
cf6ac4ce	364	}
e7b99537 TP	365
	366	fbi->fb.fix.smem_start = fb_mem_phys;
	367	fbi->fb.fix.smem_len = fb_mem_len;
	368	fbi->fb.screen_base = fb_mem_virt;
d6ff7d0f AC	369
	370	fbi->palette_size = PAGE_ALIGN(512);
	371	fbi->palette_cpu = dma_alloc_coherent(&pdev->dev,
	372	fbi->palette_size,
	373	&fbi->palette_phys,
	374	GFP_KERNEL);
	375	if (fbi->palette_cpu == NULL) {
	376	dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
	377	ret = -ENOMEM;
	378	goto failed_free_io;
	379	}
	380
	381	irq = platform_get_irq(pdev, 0);
	382	if (irq < 0) {
	383	dev_err(&pdev->dev, "no IRQ defined\n");
	384	ret = -ENODEV;
	385	goto failed_free_palette;
	386	}
	387
f8798ccb	388	ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi);
d6ff7d0f AC	389	if (ret) {
	390	dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
	391	ret = -EBUSY;
	392	goto failed_free_palette;
	393	}
	394
	395	init_waitqueue_head(&fbi->wait);
	396
	397	if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
	398	dev_err(&pdev->dev, "Failed to allocate color map\n");
	399	ret = -ENOMEM;
	400	goto failed_free_irq;
	401	}
	402
e7b99537 TP	403	fb_videomode_to_var(&fbi->fb.var, &of_mode);
	404
	405	fbi->fb.var.xres_virtual = of_mode.xres;
	406	fbi->fb.var.yres_virtual = of_mode.yres * 2;
	407	fbi->fb.var.bits_per_pixel = bpp;
d6ff7d0f AC	408
	409	ret = vt8500lcd_set_par(&fbi->fb);
	410	if (ret) {
	411	dev_err(&pdev->dev, "Failed to set parameters\n");
	412	goto failed_free_cmap;
	413	}
	414
	415	writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
	416	writel((fbi->palette_phys & 0xfffffe00) \| 1, fbi->regbase + 0x18);
	417
	418	platform_set_drvdata(pdev, fbi);
	419
	420	ret = register_framebuffer(&fbi->fb);
	421	if (ret < 0) {
	422	dev_err(&pdev->dev,
	423	"Failed to register framebuffer device: %d\n", ret);
	424	goto failed_free_cmap;
	425	}
	426
	427	/*
	428	* Ok, now enable the LCD controller
	429	*/
	430	writel(readl(fbi->regbase) \| 1, fbi->regbase);
	431
	432	return 0;
	433
	434	failed_free_cmap:
	435	if (fbi->fb.cmap.len)
	436	fb_dealloc_cmap(&fbi->fb.cmap);
	437	failed_free_irq:
	438	free_irq(irq, fbi);
	439	failed_free_palette:
	440	dma_free_coherent(&pdev->dev, fbi->palette_size,
	441	fbi->palette_cpu, fbi->palette_phys);
	442	failed_free_io:
	443	iounmap(fbi->regbase);
	444	failed_free_res:
	445	release_mem_region(res->start, resource_size(res));
d6ff7d0f AC	446	return ret;
	447	}
	448
48c68c4f	449	static int vt8500lcd_remove(struct platform_device *pdev)
d6ff7d0f AC	450	{
	451	struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
	452	struct resource *res;
	453	int irq;
	454
	455	unregister_framebuffer(&fbi->fb);
	456
	457	writel(0, fbi->regbase);
	458
	459	if (fbi->fb.cmap.len)
	460	fb_dealloc_cmap(&fbi->fb.cmap);
	461
	462	irq = platform_get_irq(pdev, 0);
	463	free_irq(irq, fbi);
	464
	465	dma_free_coherent(&pdev->dev, fbi->palette_size,
	466	fbi->palette_cpu, fbi->palette_phys);
	467
	468	iounmap(fbi->regbase);
	469
	470	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	471	release_mem_region(res->start, resource_size(res));
	472
d6ff7d0f AC	473	return 0;
	474	}
	475
e7b99537 TP	476	static const struct of_device_id via_dt_ids[] = {
	477	{ .compatible = "via,vt8500-fb", },
	478	{}
	479	};
	480
d6ff7d0f AC	481	static struct platform_driver vt8500lcd_driver = {
d6ff7d0f AC	482	.probe = vt8500lcd_probe,
48c68c4f	483	.remove = vt8500lcd_remove,
d6ff7d0f	484	.driver = {
d6ff7d0f	485	.name = "vt8500-lcd",
e7b99537	486	.of_match_table = of_match_ptr(via_dt_ids),
d6ff7d0f AC	487	},
	488	};
	489
4277f2c4	490	module_platform_driver(vt8500lcd_driver);
d6ff7d0f AC	491
	492	MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
	493	MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
e7b99537 TP	494	MODULE_LICENSE("GPL v2");
e7b99537 TP	495	MODULE_DEVICE_TABLE(of, via_dt_ids);