[net-next-2.6.git] / drivers / video / ep93xx-fb.c

/*
 * linux/drivers/video/ep93xx-fb.c
 *
 * Framebuffer support for the EP93xx series.
 *
 * Copyright (C) 2007 Bluewater Systems Ltd
 * Author: Ryan Mallon <ryan@bluewatersys.com>
 *
 * Copyright (c) 2009 H Hartley Sweeten <hsweeten@visionengravers.com>
 *
 * Based on the Cirrus Logic ep93xxfb driver, and various other ep93xxfb
 * drivers.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/fb.h>

#include <mach/fb.h>

/* Vertical Frame Timing Registers */
#define EP93XXFB_VLINES_TOTAL			0x0000	/* SW locked */
#define EP93XXFB_VSYNC				0x0004	/* SW locked */
#define EP93XXFB_VACTIVE			0x0008	/* SW locked */
#define EP93XXFB_VBLANK				0x0228	/* SW locked */
#define EP93XXFB_VCLK				0x000c	/* SW locked */

/* Horizontal Frame Timing Registers */
#define EP93XXFB_HCLKS_TOTAL			0x0010	/* SW locked */
#define EP93XXFB_HSYNC				0x0014	/* SW locked */
#define EP93XXFB_HACTIVE			0x0018	/* SW locked */
#define EP93XXFB_HBLANK				0x022c	/* SW locked */
#define EP93XXFB_HCLK				0x001c	/* SW locked */

/* Frame Buffer Memory Configuration Registers */
#define EP93XXFB_SCREEN_PAGE			0x0028
#define EP93XXFB_SCREEN_HPAGE			0x002c
#define EP93XXFB_SCREEN_LINES			0x0030
#define EP93XXFB_LINE_LENGTH			0x0034
#define EP93XXFB_VLINE_STEP			0x0038
#define EP93XXFB_LINE_CARRY			0x003c	/* SW locked */
#define EP93XXFB_EOL_OFFSET			0x0230

/* Other Video Registers */
#define EP93XXFB_BRIGHTNESS			0x0020
#define EP93XXFB_ATTRIBS			0x0024	/* SW locked */
#define EP93XXFB_SWLOCK				0x007c	/* SW locked */
#define EP93XXFB_AC_RATE			0x0214
#define EP93XXFB_FIFO_LEVEL			0x0234
#define EP93XXFB_PIXELMODE			0x0054
#define EP93XXFB_PIXELMODE_32BPP		(0x7 << 0)
#define EP93XXFB_PIXELMODE_24BPP		(0x6 << 0)
#define EP93XXFB_PIXELMODE_16BPP		(0x4 << 0)
#define EP93XXFB_PIXELMODE_8BPP			(0x2 << 0)
#define EP93XXFB_PIXELMODE_SHIFT_1P_24B		(0x0 << 3)
#define EP93XXFB_PIXELMODE_SHIFT_1P_18B		(0x1 << 3)
#define EP93XXFB_PIXELMODE_COLOR_LUT		(0x0 << 10)
#define EP93XXFB_PIXELMODE_COLOR_888		(0x4 << 10)
#define EP93XXFB_PIXELMODE_COLOR_555		(0x5 << 10)
#define EP93XXFB_PARL_IF_OUT			0x0058
#define EP93XXFB_PARL_IF_IN			0x005c

/* Blink Control Registers */
#define EP93XXFB_BLINK_RATE			0x0040
#define EP93XXFB_BLINK_MASK			0x0044
#define EP93XXFB_BLINK_PATTRN			0x0048
#define EP93XXFB_PATTRN_MASK			0x004c
#define EP93XXFB_BKGRND_OFFSET			0x0050

/* Hardware Cursor Registers */
#define EP93XXFB_CURSOR_ADR_START		0x0060
#define EP93XXFB_CURSOR_ADR_RESET		0x0064
#define EP93XXFB_CURSOR_SIZE			0x0068
#define EP93XXFB_CURSOR_COLOR1			0x006c
#define EP93XXFB_CURSOR_COLOR2			0x0070
#define EP93XXFB_CURSOR_BLINK_COLOR1		0x021c
#define EP93XXFB_CURSOR_BLINK_COLOR2		0x0220
#define EP93XXFB_CURSOR_XY_LOC			0x0074
#define EP93XXFB_CURSOR_DSCAN_HY_LOC		0x0078
#define EP93XXFB_CURSOR_BLINK_RATE_CTRL		0x0224

/* LUT Registers */
#define EP93XXFB_GRY_SCL_LUTR			0x0080
#define EP93XXFB_GRY_SCL_LUTG			0x0280
#define EP93XXFB_GRY_SCL_LUTB			0x0300
#define EP93XXFB_LUT_SW_CONTROL			0x0218
#define EP93XXFB_LUT_SW_CONTROL_SWTCH		(1 << 0)
#define EP93XXFB_LUT_SW_CONTROL_SSTAT		(1 << 1)
#define EP93XXFB_COLOR_LUT			0x0400

/* Video Signature Registers */
#define EP93XXFB_VID_SIG_RSLT_VAL		0x0200
#define EP93XXFB_VID_SIG_CTRL			0x0204
#define EP93XXFB_VSIG				0x0208
#define EP93XXFB_HSIG				0x020c
#define EP93XXFB_SIG_CLR_STR			0x0210

/* Minimum / Maximum resolutions supported */
#define EP93XXFB_MIN_XRES			64
#define EP93XXFB_MIN_YRES			64
#define EP93XXFB_MAX_XRES			1024
#define EP93XXFB_MAX_YRES			768

struct ep93xx_fbi {
	struct ep93xxfb_mach_info	*mach_info;
	struct clk			*clk;
	struct resource			*res;
	void __iomem			*mmio_base;
	unsigned int			pseudo_palette[256];
};

static int check_screenpage_bug = 1;
module_param(check_screenpage_bug, int, 0644);
MODULE_PARM_DESC(check_screenpage_bug,
		 "Check for bit 27 screen page bug. Default = 1");

static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi,
					  unsigned int off)
{
	return __raw_readl(fbi->mmio_base + off);
}

static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi,
				   unsigned int val, unsigned int off)
{
	__raw_writel(val, fbi->mmio_base + off);
}

/*
 * Write to one of the locked raster registers.
 */
static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi,
				       unsigned int val, unsigned int reg)
{
	/*
	 * We don't need a lock or delay here since the raster register
	 * block will remain unlocked until the next access.
	 */
	ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK);
	ep93xxfb_writel(fbi, val, reg);
}

static void ep93xxfb_set_video_attribs(struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;
	unsigned int attribs;

	attribs = EP93XXFB_ENABLE;
	attribs |= fbi->mach_info->flags;
	ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS);
}

static int ep93xxfb_set_pixelmode(struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;
	unsigned int val;

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

	switch (info->var.bits_per_pixel) {
	case 8:
		val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT |
			EP93XXFB_PIXELMODE_SHIFT_1P_18B;

		info->var.red.offset	= 0;
		info->var.red.length	= 8;
		info->var.green.offset	= 0;
		info->var.green.length	= 8;
		info->var.blue.offset	= 0;
		info->var.blue.length	= 8;
		info->fix.visual 	= FB_VISUAL_PSEUDOCOLOR;
		break;

	case 16:
		val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 |
			EP93XXFB_PIXELMODE_SHIFT_1P_18B;

		info->var.red.offset	= 11;
		info->var.red.length	= 5;
		info->var.green.offset	= 5;
		info->var.green.length	= 6;
		info->var.blue.offset	= 0;
		info->var.blue.length	= 5;
		info->fix.visual 	= FB_VISUAL_TRUECOLOR;
		break;

	case 24:
		val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 |
			EP93XXFB_PIXELMODE_SHIFT_1P_24B;

		info->var.red.offset	= 16;
		info->var.red.length	= 8;
		info->var.green.offset	= 8;
		info->var.green.length	= 8;
		info->var.blue.offset	= 0;
		info->var.blue.length	= 8;
		info->fix.visual 	= FB_VISUAL_TRUECOLOR;
		break;

	case 32:
		val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 |
			EP93XXFB_PIXELMODE_SHIFT_1P_24B;

		info->var.red.offset	= 16;
		info->var.red.length	= 8;
		info->var.green.offset	= 8;
		info->var.green.length	= 8;
		info->var.blue.offset	= 0;
		info->var.blue.length	= 8;
		info->fix.visual 	= FB_VISUAL_TRUECOLOR;
		break;

	default:
		return -EINVAL;
	}

	ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE);
	return 0;
}

static void ep93xxfb_set_timing(struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;
	unsigned int vlines_total, hclks_total, start, stop;

	vlines_total = info->var.yres + info->var.upper_margin +
		info->var.lower_margin + info->var.vsync_len - 1;

	hclks_total = info->var.xres + info->var.left_margin +
		info->var.right_margin + info->var.hsync_len - 1;

	ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL);
	ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL);

	start = vlines_total;
	stop = vlines_total - info->var.vsync_len;
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC);

	start = vlines_total - info->var.vsync_len - info->var.upper_margin;
	stop = info->var.lower_margin - 1;
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK);
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE);

	start = vlines_total;
	stop = vlines_total + 1;
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK);

	start = hclks_total;
	stop = hclks_total - info->var.hsync_len;
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC);

	start = hclks_total - info->var.hsync_len - info->var.left_margin;
	stop = info->var.right_margin - 1;
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK);
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE);

	start = hclks_total;
	stop = hclks_total;
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK);

	ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY);
}

static int ep93xxfb_set_par(struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;

	clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock));

	ep93xxfb_set_timing(info);

	info->fix.line_length = info->var.xres_virtual *
		info->var.bits_per_pixel / 8;

	ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE);
	ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES);
	ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel)
			      / 32) - 1, EP93XXFB_LINE_LENGTH);
	ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP);
	ep93xxfb_set_video_attribs(info);
	return 0;
}

static int ep93xxfb_check_var(struct fb_var_screeninfo *var,
			      struct fb_info *info)
{
	int err;

	err = ep93xxfb_set_pixelmode(info);
	if (err)
		return err;

	var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES);
	var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES);
	var->xres_virtual = max(var->xres_virtual, var->xres);

	var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES);
	var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES);
	var->yres_virtual = max(var->yres_virtual, var->yres);

	return 0;
}

static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
	unsigned int offset = vma->vm_pgoff << PAGE_SHIFT;

	if (offset < info->fix.smem_len) {
		return dma_mmap_writecombine(info->dev, vma, info->screen_base,
					     info->fix.smem_start,
					     info->fix.smem_len);
	}

	return -EINVAL;
}

static int ep93xxfb_blank(int blank_mode, struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;
	unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS);

	if (blank_mode) {
		if (fbi->mach_info->blank)
			fbi->mach_info->blank(blank_mode, info);
		ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE,
				    EP93XXFB_ATTRIBS);
		clk_disable(fbi->clk);
	} else {
		clk_enable(fbi->clk);
		ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE,
				    EP93XXFB_ATTRIBS);
		if (fbi->mach_info->blank)
			fbi->mach_info->blank(blank_mode, info);
	}

	return 0;
}

static inline int ep93xxfb_convert_color(int val, int width)
{
	return ((val << width) + 0x7fff - val) >> 16;
}

static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red,
			      unsigned int green, unsigned int blue,
			      unsigned int transp, struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;
	unsigned int *pal = info->pseudo_palette;
	unsigned int ctrl, i, rgb, lut_current, lut_stat;

	switch (info->fix.visual) {
	case FB_VISUAL_PSEUDOCOLOR:
		if (regno > 255)
			return 1;
		rgb = ((red & 0xff00) << 8) | (green & 0xff00) |
			((blue & 0xff00) >> 8);

		pal[regno] = rgb;
		ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2)));
		ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL);
		lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT);
		lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH);

		if (lut_stat == lut_current) {
			for (i = 0; i < 256; i++) {
				ep93xxfb_writel(fbi, pal[i],
					EP93XXFB_COLOR_LUT + (i << 2));
			}

			ep93xxfb_writel(fbi,
					ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH,
					EP93XXFB_LUT_SW_CONTROL);
		}
		break;

	case FB_VISUAL_TRUECOLOR:
		if (regno > 16)
			return 1;

		red = ep93xxfb_convert_color(red, info->var.red.length);
		green = ep93xxfb_convert_color(green, info->var.green.length);
		blue = ep93xxfb_convert_color(blue, info->var.blue.length);
		transp = ep93xxfb_convert_color(transp,
						info->var.transp.length);

		pal[regno] = (red << info->var.red.offset) |
			(green << info->var.green.offset) |
			(blue << info->var.blue.offset) |
			(transp << info->var.transp.offset);
		break;

	default:
		return 1;
	}

	return 0;
}

static struct fb_ops ep93xxfb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= ep93xxfb_check_var,
	.fb_set_par	= ep93xxfb_set_par,
	.fb_blank	= ep93xxfb_blank,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_setcolreg	= ep93xxfb_setcolreg,
	.fb_mmap	= ep93xxfb_mmap,
};

static int __init ep93xxfb_calc_fbsize(struct ep93xxfb_mach_info *mach_info)
{
	int i, fb_size = 0;

	if (mach_info->num_modes == EP93XXFB_USE_MODEDB) {
		fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES *
			mach_info->bpp / 8;
	} else {
		for (i = 0; i < mach_info->num_modes; i++) {
			const struct fb_videomode *mode;
			int size;

			mode = &mach_info->modes[i];
			size = mode->xres * mode->yres * mach_info->bpp / 8;
			if (size > fb_size)
				fb_size = size;
		}
	}

	return fb_size;
}

static int __init ep93xxfb_alloc_videomem(struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;
	char __iomem *virt_addr;
	dma_addr_t phys_addr;
	unsigned int fb_size;

	fb_size = ep93xxfb_calc_fbsize(fbi->mach_info);
	virt_addr = dma_alloc_writecombine(info->dev, fb_size,
					   &phys_addr, GFP_KERNEL);
	if (!virt_addr)
		return -ENOMEM;

	/*
	 * There is a bug in the ep93xx framebuffer which causes problems
	 * if bit 27 of the physical address is set.
	 * See: http://marc.info/?l=linux-arm-kernel&m=110061245502000&w=2
	 * There does not seem to be any offical errata for this, but I
	 * have confirmed the problem exists on my hardware (ep9315) at
	 * least.
	 */
	if (check_screenpage_bug && phys_addr & (1 << 27)) {
		dev_err(info->dev, "ep93xx framebuffer bug. phys addr (0x%x) "
			"has bit 27 set: cannot init framebuffer\n",
			phys_addr);

		dma_free_coherent(info->dev, fb_size, virt_addr, phys_addr);
		return -ENOMEM;
	}

	info->fix.smem_start = phys_addr;
	info->fix.smem_len = fb_size;
	info->screen_base = virt_addr;

	return 0;
}

static void ep93xxfb_dealloc_videomem(struct fb_info *info)
{
	if (info->screen_base)
		dma_free_coherent(info->dev, info->fix.smem_len,
				  info->screen_base, info->fix.smem_start);
}

static int __init ep93xxfb_probe(struct platform_device *pdev)
{
	struct ep93xxfb_mach_info *mach_info = pdev->dev.platform_data;
	struct fb_info *info;
	struct ep93xx_fbi *fbi;
	struct resource *res;
	char *video_mode;
	int err;

	if (!mach_info)
		return -EINVAL;

	info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev);
	if (!info)
		return -ENOMEM;

	info->dev = &pdev->dev;
	platform_set_drvdata(pdev, info);
	fbi = info->par;
	fbi->mach_info = mach_info;

	err = fb_alloc_cmap(&info->cmap, 256, 0);
	if (err)
		goto failed;

	err = ep93xxfb_alloc_videomem(info);
	if (err)
		goto failed;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		err = -ENXIO;
		goto failed;
	}

	res = request_mem_region(res->start, resource_size(res), pdev->name);
	if (!res) {
		err = -EBUSY;
		goto failed;
	}

	fbi->res = res;
	fbi->mmio_base = ioremap(res->start, resource_size(res));
	if (!fbi->mmio_base) {
		err = -ENXIO;
		goto failed;
	}

	strcpy(info->fix.id, pdev->name);
	info->fbops		= &ep93xxfb_ops;
	info->fix.type		= FB_TYPE_PACKED_PIXELS;
	info->fix.accel		= FB_ACCEL_NONE;
	info->var.activate	= FB_ACTIVATE_NOW;
	info->var.vmode		= FB_VMODE_NONINTERLACED;
	info->flags		= FBINFO_DEFAULT;
	info->node		= -1;
	info->state		= FBINFO_STATE_RUNNING;
	info->pseudo_palette	= &fbi->pseudo_palette;

	fb_get_options("ep93xx-fb", &video_mode);
	err = fb_find_mode(&info->var, info, video_mode,
			   fbi->mach_info->modes, fbi->mach_info->num_modes,
			   fbi->mach_info->default_mode, fbi->mach_info->bpp);
	if (err == 0) {
		dev_err(info->dev, "No suitable video mode found\n");
		err = -EINVAL;
		goto failed;
	}

	if (mach_info->setup) {
		err = mach_info->setup(pdev);
		if (err)
			return err;
	}

	err = ep93xxfb_check_var(&info->var, info);
	if (err)
		goto failed;

	fbi->clk = clk_get(info->dev, NULL);
	if (IS_ERR(fbi->clk)) {
		err = PTR_ERR(fbi->clk);
		fbi->clk = NULL;
		goto failed;
	}

	ep93xxfb_set_par(info);
	clk_enable(fbi->clk);

	err = register_framebuffer(info);
	if (err)
		goto failed;

	dev_info(info->dev, "registered. Mode = %dx%d-%d\n",
		 info->var.xres, info->var.yres, info->var.bits_per_pixel);
	return 0;

failed:
	if (fbi->clk)
		clk_put(fbi->clk);
	if (fbi->mmio_base)
		iounmap(fbi->mmio_base);
	if (fbi->res)
		release_mem_region(fbi->res->start, resource_size(fbi->res));
	ep93xxfb_dealloc_videomem(info);
	if (&info->cmap)
		fb_dealloc_cmap(&info->cmap);
	if (fbi->mach_info->teardown)
		fbi->mach_info->teardown(pdev);
	kfree(info);
	platform_set_drvdata(pdev, NULL);

	return err;
}

static int ep93xxfb_remove(struct platform_device *pdev)
{
	struct fb_info *info = platform_get_drvdata(pdev);
	struct ep93xx_fbi *fbi = info->par;

	unregister_framebuffer(info);
	clk_disable(fbi->clk);
	clk_put(fbi->clk);
	iounmap(fbi->mmio_base);
	release_mem_region(fbi->res->start, resource_size(fbi->res));
	ep93xxfb_dealloc_videomem(info);
	fb_dealloc_cmap(&info->cmap);

	if (fbi->mach_info->teardown)
		fbi->mach_info->teardown(pdev);

	kfree(info);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver ep93xxfb_driver = {
	.probe		= ep93xxfb_probe,
	.remove		= ep93xxfb_remove,
	.driver = {
		.name	= "ep93xx-fb",
		.owner	= THIS_MODULE,
	},
};

static int __devinit ep93xxfb_init(void)
{
	return platform_driver_register(&ep93xxfb_driver);
}

static void __exit ep93xxfb_exit(void)
{
	platform_driver_unregister(&ep93xxfb_driver);
}

module_init(ep93xxfb_init);
module_exit(ep93xxfb_exit);

MODULE_DESCRIPTION("EP93XX Framebuffer Driver");
MODULE_ALIAS("platform:ep93xx-fb");
MODULE_AUTHOR("Ryan Mallon <ryan&bluewatersys.com>, "
	      "H Hartley Sweeten <hsweeten@visionengravers.com");
MODULE_LICENSE("GPL");
Commit	Line	Data
88017bda RM	1	/*
	2	* linux/drivers/video/ep93xx-fb.c
	3	*
	4	* Framebuffer support for the EP93xx series.
	5	*
	6	* Copyright (C) 2007 Bluewater Systems Ltd
	7	* Author: Ryan Mallon <ryan@bluewatersys.com>
	8	*
	9	* Copyright (c) 2009 H Hartley Sweeten <hsweeten@visionengravers.com>
	10	*
	11	* Based on the Cirrus Logic ep93xxfb driver, and various other ep93xxfb
	12	* drivers.
	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License version 2 as
	16	* published by the Free Software Foundation.
	17	*
	18	*/
	19
	20	#include <linux/platform_device.h>
	21	#include <linux/dma-mapping.h>
5a0e3ad6	22	#include <linux/slab.h>
88017bda RM	23	#include <linux/clk.h>
	24	#include <linux/fb.h>
	25
	26	#include <mach/fb.h>
	27
	28	/* Vertical Frame Timing Registers */
	29	#define EP93XXFB_VLINES_TOTAL 0x0000 /* SW locked */
	30	#define EP93XXFB_VSYNC 0x0004 /* SW locked */
	31	#define EP93XXFB_VACTIVE 0x0008 /* SW locked */
	32	#define EP93XXFB_VBLANK 0x0228 /* SW locked */
	33	#define EP93XXFB_VCLK 0x000c /* SW locked */
	34
	35	/* Horizontal Frame Timing Registers */
	36	#define EP93XXFB_HCLKS_TOTAL 0x0010 /* SW locked */
	37	#define EP93XXFB_HSYNC 0x0014 /* SW locked */
	38	#define EP93XXFB_HACTIVE 0x0018 /* SW locked */
	39	#define EP93XXFB_HBLANK 0x022c /* SW locked */
	40	#define EP93XXFB_HCLK 0x001c /* SW locked */
	41
	42	/* Frame Buffer Memory Configuration Registers */
	43	#define EP93XXFB_SCREEN_PAGE 0x0028
	44	#define EP93XXFB_SCREEN_HPAGE 0x002c
	45	#define EP93XXFB_SCREEN_LINES 0x0030
	46	#define EP93XXFB_LINE_LENGTH 0x0034
	47	#define EP93XXFB_VLINE_STEP 0x0038
	48	#define EP93XXFB_LINE_CARRY 0x003c /* SW locked */
	49	#define EP93XXFB_EOL_OFFSET 0x0230
	50
	51	/* Other Video Registers */
	52	#define EP93XXFB_BRIGHTNESS 0x0020
	53	#define EP93XXFB_ATTRIBS 0x0024 /* SW locked */
	54	#define EP93XXFB_SWLOCK 0x007c /* SW locked */
	55	#define EP93XXFB_AC_RATE 0x0214
	56	#define EP93XXFB_FIFO_LEVEL 0x0234
	57	#define EP93XXFB_PIXELMODE 0x0054
	58	#define EP93XXFB_PIXELMODE_32BPP (0x7 << 0)
	59	#define EP93XXFB_PIXELMODE_24BPP (0x6 << 0)
	60	#define EP93XXFB_PIXELMODE_16BPP (0x4 << 0)
	61	#define EP93XXFB_PIXELMODE_8BPP (0x2 << 0)
	62	#define EP93XXFB_PIXELMODE_SHIFT_1P_24B (0x0 << 3)
	63	#define EP93XXFB_PIXELMODE_SHIFT_1P_18B (0x1 << 3)
	64	#define EP93XXFB_PIXELMODE_COLOR_LUT (0x0 << 10)
	65	#define EP93XXFB_PIXELMODE_COLOR_888 (0x4 << 10)
	66	#define EP93XXFB_PIXELMODE_COLOR_555 (0x5 << 10)
	67	#define EP93XXFB_PARL_IF_OUT 0x0058
	68	#define EP93XXFB_PARL_IF_IN 0x005c
	69
	70	/* Blink Control Registers */
	71	#define EP93XXFB_BLINK_RATE 0x0040
	72	#define EP93XXFB_BLINK_MASK 0x0044
	73	#define EP93XXFB_BLINK_PATTRN 0x0048
	74	#define EP93XXFB_PATTRN_MASK 0x004c
	75	#define EP93XXFB_BKGRND_OFFSET 0x0050
	76
	77	/* Hardware Cursor Registers */
	78	#define EP93XXFB_CURSOR_ADR_START 0x0060
	79	#define EP93XXFB_CURSOR_ADR_RESET 0x0064
	80	#define EP93XXFB_CURSOR_SIZE 0x0068
	81	#define EP93XXFB_CURSOR_COLOR1 0x006c
	82	#define EP93XXFB_CURSOR_COLOR2 0x0070
	83	#define EP93XXFB_CURSOR_BLINK_COLOR1 0x021c
	84	#define EP93XXFB_CURSOR_BLINK_COLOR2 0x0220
	85	#define EP93XXFB_CURSOR_XY_LOC 0x0074
	86	#define EP93XXFB_CURSOR_DSCAN_HY_LOC 0x0078
87	#define EP93XXFB_CURSOR_BLINK_RATE_CTRL 0x0224
88
89	/* LUT Registers */
90	#define EP93XXFB_GRY_SCL_LUTR 0x0080
91	#define EP93XXFB_GRY_SCL_LUTG 0x0280
92	#define EP93XXFB_GRY_SCL_LUTB 0x0300
93	#define EP93XXFB_LUT_SW_CONTROL 0x0218
94	#define EP93XXFB_LUT_SW_CONTROL_SWTCH (1 << 0)
95	#define EP93XXFB_LUT_SW_CONTROL_SSTAT (1 << 1)
96	#define EP93XXFB_COLOR_LUT 0x0400
97
98	/* Video Signature Registers */
99	#define EP93XXFB_VID_SIG_RSLT_VAL 0x0200
100	#define EP93XXFB_VID_SIG_CTRL 0x0204
101	#define EP93XXFB_VSIG 0x0208
102	#define EP93XXFB_HSIG 0x020c
103	#define EP93XXFB_SIG_CLR_STR 0x0210
104
105	/* Minimum / Maximum resolutions supported */
106	#define EP93XXFB_MIN_XRES 64
107	#define EP93XXFB_MIN_YRES 64
108	#define EP93XXFB_MAX_XRES 1024
109	#define EP93XXFB_MAX_YRES 768
110
111	struct ep93xx_fbi {
112	struct ep93xxfb_mach_info *mach_info;
113	struct clk *clk;
114	struct resource *res;
115	void __iomem *mmio_base;
116	unsigned int pseudo_palette[256];
117	};
118
119	static int check_screenpage_bug = 1;
120	module_param(check_screenpage_bug, int, 0644);
121	MODULE_PARM_DESC(check_screenpage_bug,
122	"Check for bit 27 screen page bug. Default = 1");
123
124	static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi,
125	unsigned int off)
126	{
127	return __raw_readl(fbi->mmio_base + off);
128	}
129
130	static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi,
131	unsigned int val, unsigned int off)
132	{
133	__raw_writel(val, fbi->mmio_base + off);
134	}
135
136	/*
137	* Write to one of the locked raster registers.
138	*/
139	static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi,
140	unsigned int val, unsigned int reg)
141	{
142	/*
143	* We don't need a lock or delay here since the raster register
144	* block will remain unlocked until the next access.
145	*/
146	ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK);
147	ep93xxfb_writel(fbi, val, reg);
148	}
149
150	static void ep93xxfb_set_video_attribs(struct fb_info *info)
151	{
152	struct ep93xx_fbi *fbi = info->par;
153	unsigned int attribs;
154
155	attribs = EP93XXFB_ENABLE;
156	attribs \|= fbi->mach_info->flags;
157	ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS);
158	}
159
160	static int ep93xxfb_set_pixelmode(struct fb_info *info)
161	{
162	struct ep93xx_fbi *fbi = info->par;
163	unsigned int val;
164
165	info->var.transp.offset = 0;
166	info->var.transp.length = 0;
167
168	switch (info->var.bits_per_pixel) {
169	case 8:
170	val = EP93XXFB_PIXELMODE_8BPP \| EP93XXFB_PIXELMODE_COLOR_LUT \|
171	EP93XXFB_PIXELMODE_SHIFT_1P_18B;
172
173	info->var.red.offset = 0;
174	info->var.red.length = 8;
175	info->var.green.offset = 0;
176	info->var.green.length = 8;
177	info->var.blue.offset = 0;
178	info->var.blue.length = 8;
179	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
180	break;
181
182	case 16:
183	val = EP93XXFB_PIXELMODE_16BPP \| EP93XXFB_PIXELMODE_COLOR_555 \|
184	EP93XXFB_PIXELMODE_SHIFT_1P_18B;
185
186	info->var.red.offset = 11;
187	info->var.red.length = 5;
188	info->var.green.offset = 5;
189	info->var.green.length = 6;
190	info->var.blue.offset = 0;
191	info->var.blue.length = 5;
192	info->fix.visual = FB_VISUAL_TRUECOLOR;
193	break;
194
195	case 24:
196	val = EP93XXFB_PIXELMODE_24BPP \| EP93XXFB_PIXELMODE_COLOR_888 \|
197	EP93XXFB_PIXELMODE_SHIFT_1P_24B;
198
199	info->var.red.offset = 16;
200	info->var.red.length = 8;
201	info->var.green.offset = 8;
202	info->var.green.length = 8;
203	info->var.blue.offset = 0;
204	info->var.blue.length = 8;
205	info->fix.visual = FB_VISUAL_TRUECOLOR;
206	break;
207
208	case 32:
209	val = EP93XXFB_PIXELMODE_32BPP \| EP93XXFB_PIXELMODE_COLOR_888 \|
210	EP93XXFB_PIXELMODE_SHIFT_1P_24B;
211
212	info->var.red.offset = 16;
213	info->var.red.length = 8;
214	info->var.green.offset = 8;
215	info->var.green.length = 8;
216	info->var.blue.offset = 0;
217	info->var.blue.length = 8;
218	info->fix.visual = FB_VISUAL_TRUECOLOR;
219	break;
220
221	default:
222	return -EINVAL;
223	}
224
225	ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE);
226	return 0;
227	}
228
229	static void ep93xxfb_set_timing(struct fb_info *info)
230	{
231	struct ep93xx_fbi *fbi = info->par;
232	unsigned int vlines_total, hclks_total, start, stop;
233
234	vlines_total = info->var.yres + info->var.upper_margin +
235	info->var.lower_margin + info->var.vsync_len - 1;
236
237	hclks_total = info->var.xres + info->var.left_margin +
238	info->var.right_margin + info->var.hsync_len - 1;
239
240	ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL);
241	ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL);
242
243	start = vlines_total;
244	stop = vlines_total - info->var.vsync_len;
245	ep93xxfb_out_locked(fbi, start \| (stop << 16), EP93XXFB_VSYNC);
246
247	start = vlines_total - info->var.vsync_len - info->var.upper_margin;
248	stop = info->var.lower_margin - 1;
249	ep93xxfb_out_locked(fbi, start \| (stop << 16), EP93XXFB_VBLANK);
250	ep93xxfb_out_locked(fbi, start \| (stop << 16), EP93XXFB_VACTIVE);
251
252	start = vlines_total;
253	stop = vlines_total + 1;
254	ep93xxfb_out_locked(fbi, start \| (stop << 16), EP93XXFB_VCLK);
255
256	start = hclks_total;
257	stop = hclks_total - info->var.hsync_len;
258	ep93xxfb_out_locked(fbi, start \| (stop << 16), EP93XXFB_HSYNC);
259
260	start = hclks_total - info->var.hsync_len - info->var.left_margin;
261	stop = info->var.right_margin - 1;
262	ep93xxfb_out_locked(fbi, start \| (stop << 16), EP93XXFB_HBLANK);
263	ep93xxfb_out_locked(fbi, start \| (stop << 16), EP93XXFB_HACTIVE);
264
265	start = hclks_total;
266	stop = hclks_total;
267	ep93xxfb_out_locked(fbi, start \| (stop << 16), EP93XXFB_HCLK);
268
269	ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY);
270	}
271
272	static int ep93xxfb_set_par(struct fb_info *info)
273	{
274	struct ep93xx_fbi *fbi = info->par;
275
276	clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock));
277
278	ep93xxfb_set_timing(info);
279
280	info->fix.line_length = info->var.xres_virtual *
281	info->var.bits_per_pixel / 8;
282
283	ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE);
284	ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES);
285	ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel)
286	/ 32) - 1, EP93XXFB_LINE_LENGTH);
287	ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP);
288	ep93xxfb_set_video_attribs(info);
289	return 0;
290	}
291
292	static int ep93xxfb_check_var(struct fb_var_screeninfo *var,
293	struct fb_info *info)
294	{
295	int err;
296
297	err = ep93xxfb_set_pixelmode(info);
298	if (err)
299	return err;
300
301	var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES);
302	var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES);
303	var->xres_virtual = max(var->xres_virtual, var->xres);
304
305	var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES);
306	var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES);
307	var->yres_virtual = max(var->yres_virtual, var->yres);
308
309	return 0;
310	}
311
312	static int ep93xxfb_mmap(struct fb_info info, struct vm_area_struct vma)
313	{
314	unsigned int offset = vma->vm_pgoff << PAGE_SHIFT;
315
316	if (offset < info->fix.smem_len) {
317	return dma_mmap_writecombine(info->dev, vma, info->screen_base,
318	info->fix.smem_start,
319	info->fix.smem_len);
320	}
321
322	return -EINVAL;
323	}
324
325	static int ep93xxfb_blank(int blank_mode, struct fb_info *info)
326	{
327	struct ep93xx_fbi *fbi = info->par;
328	unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS);
329
330	if (blank_mode) {
331	if (fbi->mach_info->blank)
332	fbi->mach_info->blank(blank_mode, info);
333	ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE,
334	EP93XXFB_ATTRIBS);
335	clk_disable(fbi->clk);
336	} else {
337	clk_enable(fbi->clk);
338	ep93xxfb_out_locked(fbi, attribs \| EP93XXFB_ENABLE,
339	EP93XXFB_ATTRIBS);
340	if (fbi->mach_info->blank)
341	fbi->mach_info->blank(blank_mode, info);
342	}
343
344	return 0;
345	}
346
347	static inline int ep93xxfb_convert_color(int val, int width)
348	{
349	return ((val << width) + 0x7fff - val) >> 16;
350	}
351
352	static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red,
353	unsigned int green, unsigned int blue,
354	unsigned int transp, struct fb_info *info)
355	{
356	struct ep93xx_fbi *fbi = info->par;
357	unsigned int *pal = info->pseudo_palette;
358	unsigned int ctrl, i, rgb, lut_current, lut_stat;
359
360	switch (info->fix.visual) {
361	case FB_VISUAL_PSEUDOCOLOR:
2f390380 KH	362	if (regno > 255)
2f390380 KH	363	return 1;
88017bda RM	364	rgb = ((red & 0xff00) << 8) \| (green & 0xff00) \|
	365	((blue & 0xff00) >> 8);
	366
	367	pal[regno] = rgb;
	368	ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2)));
	369	ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL);
	370	lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT);
	371	lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH);
	372
	373	if (lut_stat == lut_current) {
	374	for (i = 0; i < 256; i++) {
	375	ep93xxfb_writel(fbi, pal[i],
	376	EP93XXFB_COLOR_LUT + (i << 2));
	377	}
	378
	379	ep93xxfb_writel(fbi,
	380	ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH,
	381	EP93XXFB_LUT_SW_CONTROL);
	382	}
	383	break;
	384
	385	case FB_VISUAL_TRUECOLOR:
	386	if (regno > 16)
	387	return 1;
	388
	389	red = ep93xxfb_convert_color(red, info->var.red.length);
	390	green = ep93xxfb_convert_color(green, info->var.green.length);
	391	blue = ep93xxfb_convert_color(blue, info->var.blue.length);
	392	transp = ep93xxfb_convert_color(transp,
	393	info->var.transp.length);
	394
	395	pal[regno] = (red << info->var.red.offset) \|
	396	(green << info->var.green.offset) \|
	397	(blue << info->var.blue.offset) \|
	398	(transp << info->var.transp.offset);
	399	break;
	400
	401	default:
	402	return 1;
	403	}
	404
	405	return 0;
	406	}
	407
	408	static struct fb_ops ep93xxfb_ops = {
	409	.owner = THIS_MODULE,
	410	.fb_check_var = ep93xxfb_check_var,
	411	.fb_set_par = ep93xxfb_set_par,
	412	.fb_blank = ep93xxfb_blank,
	413	.fb_fillrect = cfb_fillrect,
	414	.fb_copyarea = cfb_copyarea,
	415	.fb_imageblit = cfb_imageblit,
	416	.fb_setcolreg = ep93xxfb_setcolreg,
	417	.fb_mmap = ep93xxfb_mmap,
	418	};
	419
	420	static int __init ep93xxfb_calc_fbsize(struct ep93xxfb_mach_info *mach_info)
	421	{
	422	int i, fb_size = 0;
	423
	424	if (mach_info->num_modes == EP93XXFB_USE_MODEDB) {
	425	fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES *
	426	mach_info->bpp / 8;
	427	} else {
428	for (i = 0; i < mach_info->num_modes; i++) {
429	const struct fb_videomode *mode;
430	int size;
431
432	mode = &mach_info->modes[i];
433	size = mode->xres * mode->yres * mach_info->bpp / 8;
434	if (size > fb_size)
435	fb_size = size;
436	}
437	}
438
439	return fb_size;
440	}
441
442	static int __init ep93xxfb_alloc_videomem(struct fb_info *info)
443	{
444	struct ep93xx_fbi *fbi = info->par;
445	char __iomem *virt_addr;
446	dma_addr_t phys_addr;
447	unsigned int fb_size;
448
449	fb_size = ep93xxfb_calc_fbsize(fbi->mach_info);
450	virt_addr = dma_alloc_writecombine(info->dev, fb_size,
451	&phys_addr, GFP_KERNEL);
452	if (!virt_addr)
453	return -ENOMEM;
454
455	/*
456	* There is a bug in the ep93xx framebuffer which causes problems
457	* if bit 27 of the physical address is set.
458	* See: http://marc.info/?l=linux-arm-kernel&m=110061245502000&w=2
459	* There does not seem to be any offical errata for this, but I
460	* have confirmed the problem exists on my hardware (ep9315) at
461	* least.
462	*/
463	if (check_screenpage_bug && phys_addr & (1 << 27)) {
464	dev_err(info->dev, "ep93xx framebuffer bug. phys addr (0x%x) "
465	"has bit 27 set: cannot init framebuffer\n",
466	phys_addr);
467
468	dma_free_coherent(info->dev, fb_size, virt_addr, phys_addr);
469	return -ENOMEM;
470	}
471
472	info->fix.smem_start = phys_addr;
473	info->fix.smem_len = fb_size;
474	info->screen_base = virt_addr;
475
476	return 0;
477	}
478
479	static void ep93xxfb_dealloc_videomem(struct fb_info *info)
480	{
481	if (info->screen_base)
482	dma_free_coherent(info->dev, info->fix.smem_len,
483	info->screen_base, info->fix.smem_start);
484	}
485
486	static int __init ep93xxfb_probe(struct platform_device *pdev)
487	{
488	struct ep93xxfb_mach_info *mach_info = pdev->dev.platform_data;
489	struct fb_info *info;
490	struct ep93xx_fbi *fbi;
491	struct resource *res;
492	char *video_mode;
493	int err;
494
495	if (!mach_info)
496	return -EINVAL;
497
498	info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev);
499	if (!info)
500	return -ENOMEM;
501
502	info->dev = &pdev->dev;
503	platform_set_drvdata(pdev, info);
504	fbi = info->par;
505	fbi->mach_info = mach_info;
506
507	err = fb_alloc_cmap(&info->cmap, 256, 0);
508	if (err)
509	goto failed;
510
511	err = ep93xxfb_alloc_videomem(info);
512	if (err)
513	goto failed;
514
515	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
516	if (!res) {
517	err = -ENXIO;
518	goto failed;
519	}
520
521	res = request_mem_region(res->start, resource_size(res), pdev->name);
522	if (!res) {
523	err = -EBUSY;
524	goto failed;
525	}
526
527	fbi->res = res;
528	fbi->mmio_base = ioremap(res->start, resource_size(res));
529	if (!fbi->mmio_base) {
530	err = -ENXIO;
531	goto failed;
532	}
533
534	strcpy(info->fix.id, pdev->name);
535	info->fbops = &ep93xxfb_ops;
536	info->fix.type = FB_TYPE_PACKED_PIXELS;
537	info->fix.accel = FB_ACCEL_NONE;
538	info->var.activate = FB_ACTIVATE_NOW;
539	info->var.vmode = FB_VMODE_NONINTERLACED;
540	info->flags = FBINFO_DEFAULT;
541	info->node = -1;
542	info->state = FBINFO_STATE_RUNNING;
543	info->pseudo_palette = &fbi->pseudo_palette;
544
545	fb_get_options("ep93xx-fb", &video_mode);
546	err = fb_find_mode(&info->var, info, video_mode,
547	fbi->mach_info->modes, fbi->mach_info->num_modes,
548	fbi->mach_info->default_mode, fbi->mach_info->bpp);
549	if (err == 0) {
550	dev_err(info->dev, "No suitable video mode found\n");
551	err = -EINVAL;
552	goto failed;
553	}
554
555	if (mach_info->setup) {
556	err = mach_info->setup(pdev);
557	if (err)
558	return err;
559	}
560
561	err = ep93xxfb_check_var(&info->var, info);
562	if (err)
563	goto failed;
564
565	fbi->clk = clk_get(info->dev, NULL);
566	if (IS_ERR(fbi->clk)) {
567	err = PTR_ERR(fbi->clk);
568	fbi->clk = NULL;
569	goto failed;
570	}
571
572	ep93xxfb_set_par(info);
573	clk_enable(fbi->clk);
574
575	err = register_framebuffer(info);
576	if (err)
577	goto failed;
578
579	dev_info(info->dev, "registered. Mode = %dx%d-%d\n",
580	info->var.xres, info->var.yres, info->var.bits_per_pixel);
581	return 0;
582
583	failed:
584	if (fbi->clk)
585	clk_put(fbi->clk);
586	if (fbi->mmio_base)
587	iounmap(fbi->mmio_base);
588	if (fbi->res)
589	release_mem_region(fbi->res->start, resource_size(fbi->res));
590	ep93xxfb_dealloc_videomem(info);
591	if (&info->cmap)
592	fb_dealloc_cmap(&info->cmap);
593	if (fbi->mach_info->teardown)
594	fbi->mach_info->teardown(pdev);
595	kfree(info);
596	platform_set_drvdata(pdev, NULL);
597
598	return err;
599	}
600
601	static int ep93xxfb_remove(struct platform_device *pdev)
602	{
603	struct fb_info *info = platform_get_drvdata(pdev);
604	struct ep93xx_fbi *fbi = info->par;
605
606	unregister_framebuffer(info);
607	clk_disable(fbi->clk);
608	clk_put(fbi->clk);
609	iounmap(fbi->mmio_base);
610	release_mem_region(fbi->res->start, resource_size(fbi->res));
611	ep93xxfb_dealloc_videomem(info);
612	fb_dealloc_cmap(&info->cmap);
613
614	if (fbi->mach_info->teardown)
615	fbi->mach_info->teardown(pdev);
616
617	kfree(info);
618	platform_set_drvdata(pdev, NULL);
619
620	return 0;
621	}
622
623	static struct platform_driver ep93xxfb_driver = {
624	.probe = ep93xxfb_probe,
625	.remove = ep93xxfb_remove,
626	.driver = {
627	.name = "ep93xx-fb",
628	.owner = THIS_MODULE,
629	},
630	};
631
632	static int __devinit ep93xxfb_init(void)
633	{
634	return platform_driver_register(&ep93xxfb_driver);
635	}
636
637	static void __exit ep93xxfb_exit(void)
638	{
639	platform_driver_unregister(&ep93xxfb_driver);
640	}
641
642	module_init(ep93xxfb_init);
643	module_exit(ep93xxfb_exit);
644
645	MODULE_DESCRIPTION("EP93XX Framebuffer Driver");
646	MODULE_ALIAS("platform:ep93xx-fb");
647	MODULE_AUTHOR("Ryan Mallon <ryan&bluewatersys.com>, "
648	"H Hartley Sweeten <hsweeten@visionengravers.com");
649	MODULE_LICENSE("GPL");