[linux-2.6-block.git] / drivers / video / fbdev / vt8500lcdfb.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/drivers/video/vt8500lcdfb.c
 *
 *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
 *
 * Based on skeletonfb.c and pxafb.c
 */

#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
9c92ab61	1	// SPDX-License-Identifier: GPL-2.0-only
d6ff7d0f AC	2	/*
	3	* linux/drivers/video/vt8500lcdfb.c
	4	*
	5	* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
	6	*
	7	* Based on skeletonfb.c and pxafb.c
d6ff7d0f AC	8	*/
d6ff7d0f AC	9
d6ff7d0f	10	#include <linux/delay.h>
7ab0a484 TP	11	#include <linux/dma-mapping.h>
7ab0a484 TP	12	#include <linux/errno.h>
d6ff7d0f AC	13	#include <linux/fb.h>
	14	#include <linux/init.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/io.h>
7ab0a484 TP	17	#include <linux/kernel.h>
	18	#include <linux/mm.h>
	19	#include <linux/module.h>
d6ff7d0f	20	#include <linux/platform_device.h>
7ab0a484 TP	21	#include <linux/slab.h>
7ab0a484 TP	22	#include <linux/string.h>
d6ff7d0f	23	#include <linux/wait.h>
7ab0a484	24	#include <video/of_display_timing.h>
d6ff7d0f	25
d6ff7d0f AC	26	#include "vt8500lcdfb.h"
	27	#include "wmt_ge_rops.h"
	28
e7b99537 TP	29	#ifdef CONFIG_OF
	30	#include <linux/of.h>
	31	#include <linux/of_fdt.h>
	32	#include <linux/memblock.h>
	33	#endif
	34
	35
d6ff7d0f AC	36	#define to_vt8500lcd_info(__info) container_of(__info, \
	37	struct vt8500lcd_info, fb)
	38
	39	static int vt8500lcd_set_par(struct fb_info *info)
	40	{
	41	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
	42	int reg_bpp = 5; /* 16bpp */
	43	int i;
	44	unsigned long control0;
	45
	46	if (!fbi)
	47	return -EINVAL;
	48
	49	if (info->var.bits_per_pixel <= 8) {
	50	/* palettized */
	51	info->var.red.offset = 0;
	52	info->var.red.length = info->var.bits_per_pixel;
	53	info->var.red.msb_right = 0;
	54
	55	info->var.green.offset = 0;
	56	info->var.green.length = info->var.bits_per_pixel;
	57	info->var.green.msb_right = 0;
	58
	59	info->var.blue.offset = 0;
	60	info->var.blue.length = info->var.bits_per_pixel;
	61	info->var.blue.msb_right = 0;
	62
	63	info->var.transp.offset = 0;
	64	info->var.transp.length = 0;
	65	info->var.transp.msb_right = 0;
	66
	67	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
	68	info->fix.line_length = info->var.xres_virtual /
	69	(8/info->var.bits_per_pixel);
	70	} else {
	71	/* non-palettized */
	72	info->var.transp.offset = 0;
	73	info->var.transp.length = 0;
	74	info->var.transp.msb_right = 0;
	75
	76	if (info->var.bits_per_pixel == 16) {
	77	/* RGB565 */
	78	info->var.red.offset = 11;
	79	info->var.red.length = 5;
	80	info->var.red.msb_right = 0;
	81	info->var.green.offset = 5;
	82	info->var.green.length = 6;
	83	info->var.green.msb_right = 0;
	84	info->var.blue.offset = 0;
	85	info->var.blue.length = 5;
	86	info->var.blue.msb_right = 0;
	87	} else {
	88	/* Equal depths per channel */
	89	info->var.red.offset = info->var.bits_per_pixel
	90	* 2 / 3;
	91	info->var.red.length = info->var.bits_per_pixel / 3;
	92	info->var.red.msb_right = 0;
	93	info->var.green.offset = info->var.bits_per_pixel / 3;
	94	info->var.green.length = info->var.bits_per_pixel / 3;
	95	info->var.green.msb_right = 0;
	96	info->var.blue.offset = 0;
	97	info->var.blue.length = info->var.bits_per_pixel / 3;
	98	info->var.blue.msb_right = 0;
	99	}
100
101	info->fix.visual = FB_VISUAL_TRUECOLOR;
102	info->fix.line_length = info->var.bits_per_pixel > 16 ?
103	info->var.xres_virtual << 2 :
104	info->var.xres_virtual << 1;
105	}
106
107	for (i = 0; i < 8; i++) {
0fc50517	108	if (bpp_values[i] == info->var.bits_per_pixel)
d6ff7d0f	109	reg_bpp = i;
d6ff7d0f AC	110	}
	111
	112	control0 = readl(fbi->regbase) & ~0xf;
	113	writel(0, fbi->regbase);
	114	while (readl(fbi->regbase + 0x38) & 0x10)
	115	/* wait */;
	116	writel((((info->var.hsync_len - 1) & 0x3f) << 26)
	117	\| ((info->var.left_margin & 0xff) << 18)
	118	\| (((info->var.xres - 1) & 0x3ff) << 8)
	119	\| (info->var.right_margin & 0xff), fbi->regbase + 0x4);
	120	writel((((info->var.vsync_len - 1) & 0x3f) << 26)
	121	\| ((info->var.upper_margin & 0xff) << 18)
	122	\| (((info->var.yres - 1) & 0x3ff) << 8)
	123	\| (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
	124	writel((((info->var.yres - 1) & 0x400) << 2)
	125	\| ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
	126	writel(0x80000000, fbi->regbase + 0x20);
	127	writel(control0 \| (reg_bpp << 1) \| 0x100, fbi->regbase);
	128
	129	return 0;
	130	}
	131
	132	static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
	133	{
	134	chan &= 0xffff;
	135	chan >>= 16 - bf->length;
	136	return chan << bf->offset;
	137	}
	138
	139	static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
	140	unsigned blue, unsigned transp,
	141	struct fb_info *info) {
	142	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
	143	int ret = 1;
	144	unsigned int val;
	145	if (regno >= 256)
	146	return -EINVAL;
	147
	148	if (info->var.grayscale)
	149	red = green = blue =
	150	(19595 * red + 38470 * green + 7471 * blue) >> 16;
	151
	152	switch (fbi->fb.fix.visual) {
	153	case FB_VISUAL_TRUECOLOR:
	154	if (regno < 16) {
	155	u32 *pal = fbi->fb.pseudo_palette;
	156
	157	val = chan_to_field(red, &fbi->fb.var.red);
	158	val \|= chan_to_field(green, &fbi->fb.var.green);
	159	val \|= chan_to_field(blue, &fbi->fb.var.blue);
	160
	161	pal[regno] = val;
	162	ret = 0;
	163	}
	164	break;
	165
	166	case FB_VISUAL_STATIC_PSEUDOCOLOR:
	167	case FB_VISUAL_PSEUDOCOLOR:
	168	writew((red & 0xf800)
	169	\| ((green >> 5) & 0x7e0)
	170	\| ((blue >> 11) & 0x1f),
	171	fbi->palette_cpu + sizeof(u16) * regno);
	172	break;
	173	}
174
175	return ret;
176	}
177
178	static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
179	unsigned long arg)
180	{
181	int ret = 0;
182	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
183
184	if (cmd == FBIO_WAITFORVSYNC) {
185	/* Unmask End of Frame interrupt */
186	writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
187	ret = wait_event_interruptible_timeout(fbi->wait,
188	readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
189	/* Mask back to reduce unwanted interrupt traffic */
190	writel(0xffffffff, fbi->regbase + 0x3c);
191	if (ret < 0)
192	return ret;
193	if (ret == 0)
194	return -ETIMEDOUT;
195	}
196
197	return ret;
198	}
199
200	static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
201	struct fb_info *info)
202	{
203	unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
204	unsigned off = pixlen * var->xoffset
205	+ info->fix.line_length * var->yoffset;
206	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
207
208	writel((1 << 31)
8f0246d6 LP	209	\| (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20)
8f0246d6 LP	210	\| (off >> 2), fbi->regbase + 0x20);
d6ff7d0f AC	211	return 0;
	212	}
	213
e41f1a98 AC	214	/*
	215	* vt8500lcd_blank():
	216	* Blank the display by setting all palette values to zero. Note,
	217	* True Color modes do not really use the palette, so this will not
	218	* blank the display in all modes.
	219	*/
	220	static int vt8500lcd_blank(int blank, struct fb_info *info)
	221	{
	222	int i;
	223
	224	switch (blank) {
	225	case FB_BLANK_POWERDOWN:
	226	case FB_BLANK_VSYNC_SUSPEND:
	227	case FB_BLANK_HSYNC_SUSPEND:
	228	case FB_BLANK_NORMAL:
	229	if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR \|\|
	230	info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
	231	for (i = 0; i < 256; i++)
	232	vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
	233	case FB_BLANK_UNBLANK:
	234	if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR \|\|
	235	info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
	236	fb_set_cmap(&info->cmap, info);
	237	}
	238	return 0;
	239	}
	240
d6ff7d0f AC	241	static struct fb_ops vt8500lcd_ops = {
	242	.owner = THIS_MODULE,
	243	.fb_set_par = vt8500lcd_set_par,
	244	.fb_setcolreg = vt8500lcd_setcolreg,
	245	.fb_fillrect = wmt_ge_fillrect,
	246	.fb_copyarea = wmt_ge_copyarea,
	247	.fb_imageblit = sys_imageblit,
	248	.fb_sync = wmt_ge_sync,
	249	.fb_ioctl = vt8500lcd_ioctl,
	250	.fb_pan_display = vt8500lcd_pan_display,
e41f1a98	251	.fb_blank = vt8500lcd_blank,
d6ff7d0f AC	252	};
	253
	254	static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
	255	{
	256	struct vt8500lcd_info *fbi = dev_id;
	257
	258	if (readl(fbi->regbase + 0x38) & (1 << 3))
	259	wake_up_interruptible(&fbi->wait);
	260
	261	writel(0xffffffff, fbi->regbase + 0x38);
	262	return IRQ_HANDLED;
	263	}
	264
48c68c4f	265	static int vt8500lcd_probe(struct platform_device *pdev)
d6ff7d0f AC	266	{
	267	struct vt8500lcd_info *fbi;
	268	struct resource *res;
7ab0a484	269	struct display_timings *disp_timing;
d6ff7d0f AC	270	void *addr;
	271	int irq, ret;
	272
e7b99537	273	struct fb_videomode of_mode;
e7b99537 TP	274	u32 bpp;
	275	dma_addr_t fb_mem_phys;
	276	unsigned long fb_mem_len;
	277	void *fb_mem_virt;
	278
d6ff7d0f AC	279	ret = -ENOMEM;
	280	fbi = NULL;
	281
e7b99537 TP	282	fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info)
e7b99537 TP	283	+ sizeof(u32) * 16, GFP_KERNEL);
d33a7ee9	284	if (!fbi)
46ac2956	285	return -ENOMEM;
d6ff7d0f AC	286
	287	strcpy(fbi->fb.fix.id, "VT8500 LCD");
	288
	289	fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
	290	fbi->fb.fix.xpanstep = 0;
	291	fbi->fb.fix.ypanstep = 1;
	292	fbi->fb.fix.ywrapstep = 0;
	293	fbi->fb.fix.accel = FB_ACCEL_NONE;
	294
	295	fbi->fb.var.nonstd = 0;
	296	fbi->fb.var.activate = FB_ACTIVATE_NOW;
	297	fbi->fb.var.height = -1;
	298	fbi->fb.var.width = -1;
	299	fbi->fb.var.vmode = FB_VMODE_NONINTERLACED;
	300
	301	fbi->fb.fbops = &vt8500lcd_ops;
	302	fbi->fb.flags = FBINFO_DEFAULT
	303	\| FBINFO_HWACCEL_COPYAREA
	304	\| FBINFO_HWACCEL_FILLRECT
	305	\| FBINFO_HWACCEL_YPAN
	306	\| FBINFO_VIRTFB
	307	\| FBINFO_PARTIAL_PAN_OK;
	308	fbi->fb.node = -1;
	309
	310	addr = fbi;
	311	addr = addr + sizeof(struct vt8500lcd_info);
	312	fbi->fb.pseudo_palette = addr;
	313
	314	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	315	if (res == NULL) {
	316	dev_err(&pdev->dev, "no I/O memory resource defined\n");
46ac2956	317	return -ENODEV;
d6ff7d0f AC	318	}
	319
	320	res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
	321	if (res == NULL) {
	322	dev_err(&pdev->dev, "failed to request I/O memory\n");
46ac2956	323	return -EBUSY;
d6ff7d0f AC	324	}
	325
	326	fbi->regbase = ioremap(res->start, resource_size(res));
	327	if (fbi->regbase == NULL) {
	328	dev_err(&pdev->dev, "failed to map I/O memory\n");
	329	ret = -EBUSY;
	330	goto failed_free_res;
	331	}
	332
7ab0a484	333	disp_timing = of_get_display_timings(pdev->dev.of_node);
46ac2956 DC	334	if (!disp_timing) {
	335	ret = -EINVAL;
	336	goto failed_free_io;
	337	}
e7b99537	338
7ab0a484 TP	339	ret = of_get_fb_videomode(pdev->dev.of_node, &of_mode,
	340	OF_USE_NATIVE_MODE);
	341	if (ret)
46ac2956	342	goto failed_free_io;
7ab0a484 TP	343
	344	ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
	345	if (ret)
46ac2956	346	goto failed_free_io;
e7b99537 TP	347
	348	/* try allocating the framebuffer */
	349	fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
	350	fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
	351	GFP_KERNEL);
	352	if (!fb_mem_virt) {
	353	pr_err("%s: Failed to allocate framebuffer\n", __func__);
46ac2956 DC	354	ret = -ENOMEM;
46ac2956 DC	355	goto failed_free_io;
cf6ac4ce	356	}
e7b99537 TP	357
	358	fbi->fb.fix.smem_start = fb_mem_phys;
	359	fbi->fb.fix.smem_len = fb_mem_len;
	360	fbi->fb.screen_base = fb_mem_virt;
d6ff7d0f AC	361
	362	fbi->palette_size = PAGE_ALIGN(512);
	363	fbi->palette_cpu = dma_alloc_coherent(&pdev->dev,
	364	fbi->palette_size,
	365	&fbi->palette_phys,
	366	GFP_KERNEL);
	367	if (fbi->palette_cpu == NULL) {
	368	dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
	369	ret = -ENOMEM;
	370	goto failed_free_io;
	371	}
	372
	373	irq = platform_get_irq(pdev, 0);
	374	if (irq < 0) {
	375	dev_err(&pdev->dev, "no IRQ defined\n");
	376	ret = -ENODEV;
	377	goto failed_free_palette;
	378	}
	379
f8798ccb	380	ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi);
d6ff7d0f AC	381	if (ret) {
	382	dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
	383	ret = -EBUSY;
	384	goto failed_free_palette;
	385	}
	386
	387	init_waitqueue_head(&fbi->wait);
	388
	389	if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
	390	dev_err(&pdev->dev, "Failed to allocate color map\n");
	391	ret = -ENOMEM;
	392	goto failed_free_irq;
	393	}
	394
e7b99537 TP	395	fb_videomode_to_var(&fbi->fb.var, &of_mode);
	396
	397	fbi->fb.var.xres_virtual = of_mode.xres;
	398	fbi->fb.var.yres_virtual = of_mode.yres * 2;
	399	fbi->fb.var.bits_per_pixel = bpp;
d6ff7d0f AC	400
	401	ret = vt8500lcd_set_par(&fbi->fb);
	402	if (ret) {
	403	dev_err(&pdev->dev, "Failed to set parameters\n");
	404	goto failed_free_cmap;
	405	}
	406
	407	writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
	408	writel((fbi->palette_phys & 0xfffffe00) \| 1, fbi->regbase + 0x18);
	409
	410	platform_set_drvdata(pdev, fbi);
	411
	412	ret = register_framebuffer(&fbi->fb);
	413	if (ret < 0) {
	414	dev_err(&pdev->dev,
	415	"Failed to register framebuffer device: %d\n", ret);
	416	goto failed_free_cmap;
	417	}
	418
	419	/*
	420	* Ok, now enable the LCD controller
	421	*/
	422	writel(readl(fbi->regbase) \| 1, fbi->regbase);
	423
	424	return 0;
	425
	426	failed_free_cmap:
	427	if (fbi->fb.cmap.len)
	428	fb_dealloc_cmap(&fbi->fb.cmap);
	429	failed_free_irq:
	430	free_irq(irq, fbi);
	431	failed_free_palette:
	432	dma_free_coherent(&pdev->dev, fbi->palette_size,
	433	fbi->palette_cpu, fbi->palette_phys);
	434	failed_free_io:
	435	iounmap(fbi->regbase);
	436	failed_free_res:
	437	release_mem_region(res->start, resource_size(res));
d6ff7d0f AC	438	return ret;
	439	}
	440
48c68c4f	441	static int vt8500lcd_remove(struct platform_device *pdev)
d6ff7d0f AC	442	{
	443	struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
	444	struct resource *res;
	445	int irq;
	446
	447	unregister_framebuffer(&fbi->fb);
	448
	449	writel(0, fbi->regbase);
	450
	451	if (fbi->fb.cmap.len)
	452	fb_dealloc_cmap(&fbi->fb.cmap);
	453
	454	irq = platform_get_irq(pdev, 0);
	455	free_irq(irq, fbi);
	456
	457	dma_free_coherent(&pdev->dev, fbi->palette_size,
	458	fbi->palette_cpu, fbi->palette_phys);
	459
	460	iounmap(fbi->regbase);
	461
	462	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	463	release_mem_region(res->start, resource_size(res));
	464
d6ff7d0f AC	465	return 0;
	466	}
	467
e7b99537 TP	468	static const struct of_device_id via_dt_ids[] = {
	469	{ .compatible = "via,vt8500-fb", },
	470	{}
	471	};
	472
d6ff7d0f AC	473	static struct platform_driver vt8500lcd_driver = {
d6ff7d0f AC	474	.probe = vt8500lcd_probe,
48c68c4f	475	.remove = vt8500lcd_remove,
d6ff7d0f	476	.driver = {
d6ff7d0f	477	.name = "vt8500-lcd",
e7b99537	478	.of_match_table = of_match_ptr(via_dt_ids),
d6ff7d0f AC	479	},
	480	};
	481
4277f2c4	482	module_platform_driver(vt8500lcd_driver);
d6ff7d0f AC	483
	484	MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
	485	MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
e7b99537 TP	486	MODULE_LICENSE("GPL v2");
e7b99537 TP	487	MODULE_DEVICE_TABLE(of, via_dt_ids);