[mirror_ubuntu-bionic-kernel.git] / drivers / video / amba-clcd.c

/*
 *  linux/drivers/video/amba-clcd.c
 *
 * Copyright (C) 2001 ARM Limited, by David A Rusling
 * Updated to 2.5, Deep Blue Solutions Ltd.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 *
 *  ARM PrimeCell PL110 Color LCD Controller
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/amba/bus.h>
#include <linux/amba/clcd.h>
#include <linux/clk.h>
#include <linux/hardirq.h>

#include <asm/sizes.h>

#define to_clcd(info)	container_of(info, struct clcd_fb, fb)

/* This is limited to 16 characters when displayed by X startup */
static const char *clcd_name = "CLCD FB";

/*
 * Unfortunately, the enable/disable functions may be called either from
 * process or IRQ context, and we _need_ to delay.  This is _not_ good.
 */
static inline void clcdfb_sleep(unsigned int ms)
{
	if (in_atomic()) {
		mdelay(ms);
	} else {
		msleep(ms);
	}
}

static inline void clcdfb_set_start(struct clcd_fb *fb)
{
	unsigned long ustart = fb->fb.fix.smem_start;
	unsigned long lstart;

	ustart += fb->fb.var.yoffset * fb->fb.fix.line_length;
	lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2;

	writel(ustart, fb->regs + CLCD_UBAS);
	writel(lstart, fb->regs + CLCD_LBAS);
}

static void clcdfb_disable(struct clcd_fb *fb)
{
	u32 val;

	if (fb->board->disable)
		fb->board->disable(fb);

	val = readl(fb->regs + CLCD_CNTL);
	if (val & CNTL_LCDPWR) {
		val &= ~CNTL_LCDPWR;
		writel(val, fb->regs + CLCD_CNTL);

		clcdfb_sleep(20);
	}
	if (val & CNTL_LCDEN) {
		val &= ~CNTL_LCDEN;
		writel(val, fb->regs + CLCD_CNTL);
	}

	/*
	 * Disable CLCD clock source.
	 */
	clk_disable(fb->clk);
}

static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
{
	/*
	 * Enable the CLCD clock source.
	 */
	clk_enable(fb->clk);

	/*
	 * Bring up by first enabling..
	 */
	cntl |= CNTL_LCDEN;
	writel(cntl, fb->regs + CLCD_CNTL);

	clcdfb_sleep(20);

	/*
	 * and now apply power.
	 */
	cntl |= CNTL_LCDPWR;
	writel(cntl, fb->regs + CLCD_CNTL);

	/*
	 * finally, enable the interface.
	 */
	if (fb->board->enable)
		fb->board->enable(fb);
}

static int
clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
{
	int ret = 0;

	memset(&var->transp, 0, sizeof(var->transp));

	var->red.msb_right = 0;
	var->green.msb_right = 0;
	var->blue.msb_right = 0;

	switch (var->bits_per_pixel) {
	case 1:
	case 2:
	case 4:
	case 8:
		var->red.length		= var->bits_per_pixel;
		var->red.offset		= 0;
		var->green.length	= var->bits_per_pixel;
		var->green.offset	= 0;
		var->blue.length	= var->bits_per_pixel;
		var->blue.offset	= 0;
		break;
	case 16:
		var->red.length = 5;
		var->blue.length = 5;
		/*
		 * Green length can be 5 or 6 depending whether
		 * we're operating in RGB555 or RGB565 mode.
		 */
		if (var->green.length != 5 && var->green.length != 6)
			var->green.length = 6;
		break;
	case 32:
		if (fb->panel->cntl & CNTL_LCDTFT) {
			var->red.length		= 8;
			var->green.length	= 8;
			var->blue.length	= 8;
			break;
		}
	default:
		ret = -EINVAL;
		break;
	}

	/*
	 * >= 16bpp displays have separate colour component bitfields
	 * encoded in the pixel data.  Calculate their position from
	 * the bitfield length defined above.
	 */
	if (ret == 0 && var->bits_per_pixel >= 16) {
		if (fb->panel->cntl & CNTL_BGR) {
			var->blue.offset = 0;
			var->green.offset = var->blue.offset + var->blue.length;
			var->red.offset = var->green.offset + var->green.length;
		} else {
			var->red.offset = 0;
			var->green.offset = var->red.offset + var->red.length;
			var->blue.offset = var->green.offset + var->green.length;
		}
	}

	return ret;
}

static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	struct clcd_fb *fb = to_clcd(info);
	int ret = -EINVAL;

	if (fb->board->check)
		ret = fb->board->check(fb, var);

	if (ret == 0 &&
	    var->xres_virtual * var->bits_per_pixel / 8 *
	    var->yres_virtual > fb->fb.fix.smem_len)
		ret = -EINVAL;

	if (ret == 0)
		ret = clcdfb_set_bitfields(fb, var);

	return ret;
}

static int clcdfb_set_par(struct fb_info *info)
{
	struct clcd_fb *fb = to_clcd(info);
	struct clcd_regs regs;

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

	if (fb->fb.var.bits_per_pixel <= 8)
		fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
	else
		fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;

	fb->board->decode(fb, &regs);

	clcdfb_disable(fb);

	writel(regs.tim0, fb->regs + CLCD_TIM0);
	writel(regs.tim1, fb->regs + CLCD_TIM1);
	writel(regs.tim2, fb->regs + CLCD_TIM2);
	writel(regs.tim3, fb->regs + CLCD_TIM3);

	clcdfb_set_start(fb);

	clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);

	fb->clcd_cntl = regs.cntl;

	clcdfb_enable(fb, regs.cntl);

#ifdef DEBUG
	printk(KERN_INFO "CLCD: Registers set to\n"
	       KERN_INFO "  %08x %08x %08x %08x\n"
	       KERN_INFO "  %08x %08x %08x %08x\n",
		readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
		readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
		readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
		readl(fb->regs + CLCD_IENB), readl(fb->regs + CLCD_CNTL));
#endif

	return 0;
}

static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
{
	unsigned int mask = (1 << bf->length) - 1;

	return (val >> (16 - bf->length) & mask) << bf->offset;
}

/*
 *  Set a single color register. The values supplied have a 16 bit
 *  magnitude.  Return != 0 for invalid regno.
 */
static int
clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
		 unsigned int blue, unsigned int transp, struct fb_info *info)
{
	struct clcd_fb *fb = to_clcd(info);

	if (regno < 16)
		fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
				  convert_bitfield(blue, &fb->fb.var.blue) |
				  convert_bitfield(green, &fb->fb.var.green) |
				  convert_bitfield(red, &fb->fb.var.red);

	if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
		int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
		u32 val, mask, newval;

		newval  = (red >> 11)  & 0x001f;
		newval |= (green >> 6) & 0x03e0;
		newval |= (blue >> 1)  & 0x7c00;

		/*
		 * 3.2.11: if we're configured for big endian
		 * byte order, the palette entries are swapped.
		 */
		if (fb->clcd_cntl & CNTL_BEBO)
			regno ^= 1;

		if (regno & 1) {
			newval <<= 16;
			mask = 0x0000ffff;
		} else {
			mask = 0xffff0000;
		}

		val = readl(fb->regs + hw_reg) & mask;
		writel(val | newval, fb->regs + hw_reg);
	}

	return regno > 255;
}

/*
 *  Blank the screen if blank_mode != 0, else unblank. If blank == NULL
 *  then the caller blanks by setting the CLUT (Color Look Up Table) to all
 *  black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
 *  to e.g. a video mode which doesn't support it. Implements VESA suspend
 *  and powerdown modes on hardware that supports disabling hsync/vsync:
 *    blank_mode == 2: suspend vsync
 *    blank_mode == 3: suspend hsync
 *    blank_mode == 4: powerdown
 */
static int clcdfb_blank(int blank_mode, struct fb_info *info)
{
	struct clcd_fb *fb = to_clcd(info);

	if (blank_mode != 0) {
		clcdfb_disable(fb);
	} else {
		clcdfb_enable(fb, fb->clcd_cntl);
	}
	return 0;
}

static int clcdfb_mmap(struct fb_info *info,
		       struct vm_area_struct *vma)
{
	struct clcd_fb *fb = to_clcd(info);
	unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
	int ret = -EINVAL;

	len = info->fix.smem_len;

	if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
	    fb->board->mmap)
		ret = fb->board->mmap(fb, vma);

	return ret;
}

static struct fb_ops clcdfb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= clcdfb_check_var,
	.fb_set_par	= clcdfb_set_par,
	.fb_setcolreg	= clcdfb_setcolreg,
	.fb_blank	= clcdfb_blank,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_mmap	= clcdfb_mmap,
};

static int clcdfb_register(struct clcd_fb *fb)
{
	int ret;

	fb->clk = clk_get(&fb->dev->dev, NULL);
	if (IS_ERR(fb->clk)) {
		ret = PTR_ERR(fb->clk);
		goto out;
	}

	fb->fb.fix.mmio_start	= fb->dev->res.start;
	fb->fb.fix.mmio_len	= resource_size(&fb->dev->res);

	fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
	if (!fb->regs) {
		printk(KERN_ERR "CLCD: unable to remap registers\n");
		ret = -ENOMEM;
		goto free_clk;
	}

	fb->fb.fbops		= &clcdfb_ops;
	fb->fb.flags		= FBINFO_FLAG_DEFAULT;
	fb->fb.pseudo_palette	= fb->cmap;

	strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
	fb->fb.fix.type		= FB_TYPE_PACKED_PIXELS;
	fb->fb.fix.type_aux	= 0;
	fb->fb.fix.xpanstep	= 0;
	fb->fb.fix.ypanstep	= 0;
	fb->fb.fix.ywrapstep	= 0;
	fb->fb.fix.accel	= FB_ACCEL_NONE;

	fb->fb.var.xres		= fb->panel->mode.xres;
	fb->fb.var.yres		= fb->panel->mode.yres;
	fb->fb.var.xres_virtual	= fb->panel->mode.xres;
	fb->fb.var.yres_virtual	= fb->panel->mode.yres;
	fb->fb.var.bits_per_pixel = fb->panel->bpp;
	fb->fb.var.grayscale	= fb->panel->grayscale;
	fb->fb.var.pixclock	= fb->panel->mode.pixclock;
	fb->fb.var.left_margin	= fb->panel->mode.left_margin;
	fb->fb.var.right_margin	= fb->panel->mode.right_margin;
	fb->fb.var.upper_margin	= fb->panel->mode.upper_margin;
	fb->fb.var.lower_margin	= fb->panel->mode.lower_margin;
	fb->fb.var.hsync_len	= fb->panel->mode.hsync_len;
	fb->fb.var.vsync_len	= fb->panel->mode.vsync_len;
	fb->fb.var.sync		= fb->panel->mode.sync;
	fb->fb.var.vmode	= fb->panel->mode.vmode;
	fb->fb.var.activate	= FB_ACTIVATE_NOW;
	fb->fb.var.nonstd	= 0;
	fb->fb.var.height	= fb->panel->height;
	fb->fb.var.width	= fb->panel->width;
	fb->fb.var.accel_flags	= 0;

	fb->fb.monspecs.hfmin	= 0;
	fb->fb.monspecs.hfmax   = 100000;
	fb->fb.monspecs.vfmin	= 0;
	fb->fb.monspecs.vfmax	= 400;
	fb->fb.monspecs.dclkmin = 1000000;
	fb->fb.monspecs.dclkmax	= 100000000;

	/*
	 * Make sure that the bitfields are set appropriately.
	 */
	clcdfb_set_bitfields(fb, &fb->fb.var);

	/*
	 * Allocate colourmap.
	 */
	ret = fb_alloc_cmap(&fb->fb.cmap, 256, 0);
	if (ret)
		goto unmap;

	/*
	 * Ensure interrupts are disabled.
	 */
	writel(0, fb->regs + CLCD_IENB);

	fb_set_var(&fb->fb, &fb->fb.var);

        printk(KERN_INFO "CLCD: %s hardware, %s display\n",
               fb->board->name, fb->panel->mode.name);

	ret = register_framebuffer(&fb->fb);
	if (ret == 0)
		goto out;

	printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);

	fb_dealloc_cmap(&fb->fb.cmap);
 unmap:
	iounmap(fb->regs);
 free_clk:
	clk_put(fb->clk);
 out:
	return ret;
}

static int clcdfb_probe(struct amba_device *dev, struct amba_id *id)
{
	struct clcd_board *board = dev->dev.platform_data;
	struct clcd_fb *fb;
	int ret;

	if (!board)
		return -EINVAL;

	ret = amba_request_regions(dev, NULL);
	if (ret) {
		printk(KERN_ERR "CLCD: unable to reserve regs region\n");
		goto out;
	}

	fb = kzalloc(sizeof(struct clcd_fb), GFP_KERNEL);
	if (!fb) {
		printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
		ret = -ENOMEM;
		goto free_region;
	}

	fb->dev = dev;
	fb->board = board;

	ret = fb->board->setup(fb);
	if (ret)
		goto free_fb;

	ret = clcdfb_register(fb); 
	if (ret == 0) {
		amba_set_drvdata(dev, fb);
		goto out;
	}

	fb->board->remove(fb);
 free_fb:
	kfree(fb);
 free_region:
	amba_release_regions(dev);
 out:
	return ret;
}

static int clcdfb_remove(struct amba_device *dev)
{
	struct clcd_fb *fb = amba_get_drvdata(dev);

	amba_set_drvdata(dev, NULL);

	clcdfb_disable(fb);
	unregister_framebuffer(&fb->fb);
	if (fb->fb.cmap.len)
		fb_dealloc_cmap(&fb->fb.cmap);
	iounmap(fb->regs);
	clk_put(fb->clk);

	fb->board->remove(fb);

	kfree(fb);

	amba_release_regions(dev);

	return 0;
}

static struct amba_id clcdfb_id_table[] = {
	{
		.id	= 0x00041110,
		.mask	= 0x000ffffe,
	},
	{ 0, 0 },
};

static struct amba_driver clcd_driver = {
	.drv 		= {
		.name	= "clcd-pl11x",
	},
	.probe		= clcdfb_probe,
	.remove		= clcdfb_remove,
	.id_table	= clcdfb_id_table,
};

static int __init amba_clcdfb_init(void)
{
	if (fb_get_options("ambafb", NULL))
		return -ENODEV;

	return amba_driver_register(&clcd_driver);
}

module_init(amba_clcdfb_init);

static void __exit amba_clcdfb_exit(void)
{
	amba_driver_unregister(&clcd_driver);
}

module_exit(amba_clcdfb_exit);

MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/video/amba-clcd.c
	3	*
	4	* Copyright (C) 2001 ARM Limited, by David A Rusling
	5	* Updated to 2.5, Deep Blue Solutions Ltd.
	6	*
	7	* This file is subject to the terms and conditions of the GNU General Public
	8	* License. See the file COPYING in the main directory of this archive
	9	* for more details.
	10	*
	11	* ARM PrimeCell PL110 Color LCD Controller
	12	*/
	13	#include <linux/module.h>
	14	#include <linux/kernel.h>
	15	#include <linux/errno.h>
	16	#include <linux/string.h>
	17	#include <linux/slab.h>
	18	#include <linux/delay.h>
	19	#include <linux/mm.h>
	20	#include <linux/fb.h>
	21	#include <linux/init.h>
	22	#include <linux/ioport.h>
	23	#include <linux/list.h>
a62c80e5 RK	24	#include <linux/amba/bus.h>
a62c80e5 RK	25	#include <linux/amba/clcd.h>
f8ce2547	26	#include <linux/clk.h>
934848da	27	#include <linux/hardirq.h>
1da177e4	28
c6b8fdad	29	#include <asm/sizes.h>
1da177e4	30
1da177e4 LT	31	#define to_clcd(info) container_of(info, struct clcd_fb, fb)
	32
	33	/* This is limited to 16 characters when displayed by X startup */
	34	static const char *clcd_name = "CLCD FB";
	35
	36	/*
	37	* Unfortunately, the enable/disable functions may be called either from
	38	* process or IRQ context, and we _need_ to delay. This is _not_ good.
	39	*/
	40	static inline void clcdfb_sleep(unsigned int ms)
	41	{
	42	if (in_atomic()) {
	43	mdelay(ms);
	44	} else {
	45	msleep(ms);
	46	}
	47	}
	48
	49	static inline void clcdfb_set_start(struct clcd_fb *fb)
	50	{
	51	unsigned long ustart = fb->fb.fix.smem_start;
	52	unsigned long lstart;
	53
	54	ustart += fb->fb.var.yoffset * fb->fb.fix.line_length;
	55	lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2;
	56
	57	writel(ustart, fb->regs + CLCD_UBAS);
	58	writel(lstart, fb->regs + CLCD_LBAS);
	59	}
	60
	61	static void clcdfb_disable(struct clcd_fb *fb)
	62	{
	63	u32 val;
	64
	65	if (fb->board->disable)
	66	fb->board->disable(fb);
	67
	68	val = readl(fb->regs + CLCD_CNTL);
	69	if (val & CNTL_LCDPWR) {
	70	val &= ~CNTL_LCDPWR;
	71	writel(val, fb->regs + CLCD_CNTL);
	72
	73	clcdfb_sleep(20);
	74	}
	75	if (val & CNTL_LCDEN) {
	76	val &= ~CNTL_LCDEN;
	77	writel(val, fb->regs + CLCD_CNTL);
	78	}
	79
	80	/*
	81	* Disable CLCD clock source.
	82	*/
	83	clk_disable(fb->clk);
	84	}
	85
	86	static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
	87	{
	88	/*
	89	* Enable the CLCD clock source.
	90	*/
	91	clk_enable(fb->clk);
	92
	93	/*
	94	* Bring up by first enabling..
95	*/
96	cntl \|= CNTL_LCDEN;
97	writel(cntl, fb->regs + CLCD_CNTL);
98
99	clcdfb_sleep(20);
100
101	/*
102	* and now apply power.
103	*/
104	cntl \|= CNTL_LCDPWR;
105	writel(cntl, fb->regs + CLCD_CNTL);
106
107	/*
108	* finally, enable the interface.
109	*/
110	if (fb->board->enable)
111	fb->board->enable(fb);
112	}
113
114	static int
115	clcdfb_set_bitfields(struct clcd_fb fb, struct fb_var_screeninfo var)
116	{
117	int ret = 0;
118
119	memset(&var->transp, 0, sizeof(var->transp));
c43e6f02 RK	120
	121	var->red.msb_right = 0;
	122	var->green.msb_right = 0;
	123	var->blue.msb_right = 0;
1da177e4 LT	124
	125	switch (var->bits_per_pixel) {
	126	case 1:
	127	case 2:
	128	case 4:
	129	case 8:
c4d12b98	130	var->red.length = var->bits_per_pixel;
1da177e4	131	var->red.offset = 0;
c4d12b98	132	var->green.length = var->bits_per_pixel;
1da177e4	133	var->green.offset = 0;
c4d12b98	134	var->blue.length = var->bits_per_pixel;
1da177e4 LT	135	var->blue.offset = 0;
	136	break;
	137	case 16:
c43e6f02 RK	138	var->red.length = 5;
	139	var->blue.length = 5;
	140	/*
	141	* Green length can be 5 or 6 depending whether
	142	* we're operating in RGB555 or RGB565 mode.
	143	*/
	144	if (var->green.length != 5 && var->green.length != 6)
	145	var->green.length = 6;
1da177e4	146	break;
82235e91	147	case 32:
1da177e4 LT	148	if (fb->panel->cntl & CNTL_LCDTFT) {
	149	var->red.length = 8;
	150	var->green.length = 8;
	151	var->blue.length = 8;
1da177e4 LT	152	break;
	153	}
	154	default:
	155	ret = -EINVAL;
	156	break;
	157	}
	158
c43e6f02 RK	159	/*
	160	* >= 16bpp displays have separate colour component bitfields
	161	* encoded in the pixel data. Calculate their position from
	162	* the bitfield length defined above.
	163	*/
	164	if (ret == 0 && var->bits_per_pixel >= 16) {
	165	if (fb->panel->cntl & CNTL_BGR) {
	166	var->blue.offset = 0;
	167	var->green.offset = var->blue.offset + var->blue.length;
	168	var->red.offset = var->green.offset + var->green.length;
	169	} else {
	170	var->red.offset = 0;
	171	var->green.offset = var->red.offset + var->red.length;
	172	var->blue.offset = var->green.offset + var->green.length;
	173	}
	174	}
	175
1da177e4 LT	176	return ret;
	177	}
	178
	179	static int clcdfb_check_var(struct fb_var_screeninfo var, struct fb_info info)
	180	{
	181	struct clcd_fb *fb = to_clcd(info);
	182	int ret = -EINVAL;
	183
	184	if (fb->board->check)
	185	ret = fb->board->check(fb, var);
82235e91 RK	186
	187	if (ret == 0 &&
	188	var->xres_virtual * var->bits_per_pixel / 8 *
	189	var->yres_virtual > fb->fb.fix.smem_len)
	190	ret = -EINVAL;
	191
1da177e4 LT	192	if (ret == 0)
	193	ret = clcdfb_set_bitfields(fb, var);
	194
	195	return ret;
	196	}
	197
	198	static int clcdfb_set_par(struct fb_info *info)
	199	{
	200	struct clcd_fb *fb = to_clcd(info);
	201	struct clcd_regs regs;
	202
	203	fb->fb.fix.line_length = fb->fb.var.xres_virtual *
	204	fb->fb.var.bits_per_pixel / 8;
	205
	206	if (fb->fb.var.bits_per_pixel <= 8)
	207	fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
	208	else
	209	fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
	210
	211	fb->board->decode(fb, &regs);
	212
	213	clcdfb_disable(fb);
	214
	215	writel(regs.tim0, fb->regs + CLCD_TIM0);
	216	writel(regs.tim1, fb->regs + CLCD_TIM1);
	217	writel(regs.tim2, fb->regs + CLCD_TIM2);
	218	writel(regs.tim3, fb->regs + CLCD_TIM3);
	219
	220	clcdfb_set_start(fb);
	221
	222	clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);
	223
	224	fb->clcd_cntl = regs.cntl;
	225
	226	clcdfb_enable(fb, regs.cntl);
	227
	228	#ifdef DEBUG
	229	printk(KERN_INFO "CLCD: Registers set to\n"
	230	KERN_INFO " %08x %08x %08x %08x\n"
	231	KERN_INFO " %08x %08x %08x %08x\n",
	232	readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
	233	readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
	234	readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
	235	readl(fb->regs + CLCD_IENB), readl(fb->regs + CLCD_CNTL));
	236	#endif
	237
	238	return 0;
	239	}
	240
	241	static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
	242	{
	243	unsigned int mask = (1 << bf->length) - 1;
	244
	245	return (val >> (16 - bf->length) & mask) << bf->offset;
	246	}
	247
	248	/*
	249	* Set a single color register. The values supplied have a 16 bit
	250	* magnitude. Return != 0 for invalid regno.
	251	*/
	252	static int
	253	clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
	254	unsigned int blue, unsigned int transp, struct fb_info *info)
	255	{
256	struct clcd_fb *fb = to_clcd(info);
257
258	if (regno < 16)
259	fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) \|
260	convert_bitfield(blue, &fb->fb.var.blue) \|
261	convert_bitfield(green, &fb->fb.var.green) \|
262	convert_bitfield(red, &fb->fb.var.red);
263
1ddb8a16	264	if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
1da177e4 LT	265	int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
	266	u32 val, mask, newval;
	267
	268	newval = (red >> 11) & 0x001f;
	269	newval \|= (green >> 6) & 0x03e0;
	270	newval \|= (blue >> 1) & 0x7c00;
	271
	272	/*
	273	* 3.2.11: if we're configured for big endian
	274	* byte order, the palette entries are swapped.
	275	*/
	276	if (fb->clcd_cntl & CNTL_BEBO)
	277	regno ^= 1;
	278
	279	if (regno & 1) {
	280	newval <<= 16;
	281	mask = 0x0000ffff;
	282	} else {
	283	mask = 0xffff0000;
	284	}
	285
	286	val = readl(fb->regs + hw_reg) & mask;
	287	writel(val \| newval, fb->regs + hw_reg);
	288	}
	289
	290	return regno > 255;
	291	}
	292
	293	/*
	294	* Blank the screen if blank_mode != 0, else unblank. If blank == NULL
	295	* then the caller blanks by setting the CLUT (Color Look Up Table) to all
	296	* black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
	297	* to e.g. a video mode which doesn't support it. Implements VESA suspend
	298	* and powerdown modes on hardware that supports disabling hsync/vsync:
	299	* blank_mode == 2: suspend vsync
	300	* blank_mode == 3: suspend hsync
	301	* blank_mode == 4: powerdown
	302	*/
	303	static int clcdfb_blank(int blank_mode, struct fb_info *info)
	304	{
	305	struct clcd_fb *fb = to_clcd(info);
	306
	307	if (blank_mode != 0) {
	308	clcdfb_disable(fb);
	309	} else {
	310	clcdfb_enable(fb, fb->clcd_cntl);
	311	}
	312	return 0;
	313	}
	314
216d526c	315	static int clcdfb_mmap(struct fb_info *info,
1da177e4 LT	316	struct vm_area_struct *vma)
	317	{
	318	struct clcd_fb *fb = to_clcd(info);
	319	unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
	320	int ret = -EINVAL;
	321
	322	len = info->fix.smem_len;
	323
	324	if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
	325	fb->board->mmap)
	326	ret = fb->board->mmap(fb, vma);
	327
	328	return ret;
	329	}
	330
	331	static struct fb_ops clcdfb_ops = {
	332	.owner = THIS_MODULE,
	333	.fb_check_var = clcdfb_check_var,
	334	.fb_set_par = clcdfb_set_par,
	335	.fb_setcolreg = clcdfb_setcolreg,
	336	.fb_blank = clcdfb_blank,
	337	.fb_fillrect = cfb_fillrect,
	338	.fb_copyarea = cfb_copyarea,
	339	.fb_imageblit = cfb_imageblit,
1da177e4 LT	340	.fb_mmap = clcdfb_mmap,
	341	};
	342
	343	static int clcdfb_register(struct clcd_fb *fb)
	344	{
	345	int ret;
	346
ee569c43	347	fb->clk = clk_get(&fb->dev->dev, NULL);
1da177e4 LT	348	if (IS_ERR(fb->clk)) {
	349	ret = PTR_ERR(fb->clk);
	350	goto out;
	351	}
	352
1da177e4	353	fb->fb.fix.mmio_start = fb->dev->res.start;
dc890c2d	354	fb->fb.fix.mmio_len = resource_size(&fb->dev->res);
1da177e4 LT	355
	356	fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
	357	if (!fb->regs) {
	358	printk(KERN_ERR "CLCD: unable to remap registers\n");
	359	ret = -ENOMEM;
a8d3584a	360	goto free_clk;
1da177e4 LT	361	}
	362
	363	fb->fb.fbops = &clcdfb_ops;
	364	fb->fb.flags = FBINFO_FLAG_DEFAULT;
	365	fb->fb.pseudo_palette = fb->cmap;
	366
	367	strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
	368	fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
	369	fb->fb.fix.type_aux = 0;
	370	fb->fb.fix.xpanstep = 0;
	371	fb->fb.fix.ypanstep = 0;
	372	fb->fb.fix.ywrapstep = 0;
	373	fb->fb.fix.accel = FB_ACCEL_NONE;
	374
	375	fb->fb.var.xres = fb->panel->mode.xres;
	376	fb->fb.var.yres = fb->panel->mode.yres;
	377	fb->fb.var.xres_virtual = fb->panel->mode.xres;
	378	fb->fb.var.yres_virtual = fb->panel->mode.yres;
	379	fb->fb.var.bits_per_pixel = fb->panel->bpp;
	380	fb->fb.var.grayscale = fb->panel->grayscale;
	381	fb->fb.var.pixclock = fb->panel->mode.pixclock;
	382	fb->fb.var.left_margin = fb->panel->mode.left_margin;
	383	fb->fb.var.right_margin = fb->panel->mode.right_margin;
	384	fb->fb.var.upper_margin = fb->panel->mode.upper_margin;
	385	fb->fb.var.lower_margin = fb->panel->mode.lower_margin;
	386	fb->fb.var.hsync_len = fb->panel->mode.hsync_len;
	387	fb->fb.var.vsync_len = fb->panel->mode.vsync_len;
	388	fb->fb.var.sync = fb->panel->mode.sync;
	389	fb->fb.var.vmode = fb->panel->mode.vmode;
	390	fb->fb.var.activate = FB_ACTIVATE_NOW;
	391	fb->fb.var.nonstd = 0;
	392	fb->fb.var.height = fb->panel->height;
	393	fb->fb.var.width = fb->panel->width;
	394	fb->fb.var.accel_flags = 0;
	395
	396	fb->fb.monspecs.hfmin = 0;
	397	fb->fb.monspecs.hfmax = 100000;
	398	fb->fb.monspecs.vfmin = 0;
	399	fb->fb.monspecs.vfmax = 400;
	400	fb->fb.monspecs.dclkmin = 1000000;
	401	fb->fb.monspecs.dclkmax = 100000000;
	402
	403	/*
	404	* Make sure that the bitfields are set appropriately.
	405	*/
	406	clcdfb_set_bitfields(fb, &fb->fb.var);
	407
	408	/*
	409	* Allocate colourmap.
	410	*/
909baf00 AS	411	ret = fb_alloc_cmap(&fb->fb.cmap, 256, 0);
	412	if (ret)
	413	goto unmap;
1da177e4 LT	414
	415	/*
	416	* Ensure interrupts are disabled.
	417	*/
	418	writel(0, fb->regs + CLCD_IENB);
	419
	420	fb_set_var(&fb->fb, &fb->fb.var);
	421
	422	printk(KERN_INFO "CLCD: %s hardware, %s display\n",
	423	fb->board->name, fb->panel->mode.name);
	424
	425	ret = register_framebuffer(&fb->fb);
	426	if (ret == 0)
	427	goto out;
	428
	429	printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);
	430
909baf00 AS	431	fb_dealloc_cmap(&fb->fb.cmap);
909baf00 AS	432	unmap:
1da177e4	433	iounmap(fb->regs);
1da177e4 LT	434	free_clk:
	435	clk_put(fb->clk);
	436	out:
	437	return ret;
	438	}
	439
03fbdb15	440	static int clcdfb_probe(struct amba_device dev, struct amba_id id)
1da177e4 LT	441	{
	442	struct clcd_board *board = dev->dev.platform_data;
	443	struct clcd_fb *fb;
	444	int ret;
	445
	446	if (!board)
	447	return -EINVAL;
	448
	449	ret = amba_request_regions(dev, NULL);
	450	if (ret) {
	451	printk(KERN_ERR "CLCD: unable to reserve regs region\n");
	452	goto out;
	453	}
	454
dd00cc48	455	fb = kzalloc(sizeof(struct clcd_fb), GFP_KERNEL);
1da177e4 LT	456	if (!fb) {
	457	printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
	458	ret = -ENOMEM;
	459	goto free_region;
	460	}
1da177e4 LT	461
	462	fb->dev = dev;
	463	fb->board = board;
	464
	465	ret = fb->board->setup(fb);
	466	if (ret)
	467	goto free_fb;
	468
	469	ret = clcdfb_register(fb);
	470	if (ret == 0) {
	471	amba_set_drvdata(dev, fb);
	472	goto out;
	473	}
	474
	475	fb->board->remove(fb);
	476	free_fb:
	477	kfree(fb);
	478	free_region:
	479	amba_release_regions(dev);
	480	out:
	481	return ret;
	482	}
	483
	484	static int clcdfb_remove(struct amba_device *dev)
	485	{
	486	struct clcd_fb *fb = amba_get_drvdata(dev);
	487
	488	amba_set_drvdata(dev, NULL);
	489
	490	clcdfb_disable(fb);
	491	unregister_framebuffer(&fb->fb);
909baf00 AS	492	if (fb->fb.cmap.len)
909baf00 AS	493	fb_dealloc_cmap(&fb->fb.cmap);
1da177e4	494	iounmap(fb->regs);
1da177e4 LT	495	clk_put(fb->clk);
	496
	497	fb->board->remove(fb);
	498
	499	kfree(fb);
	500
	501	amba_release_regions(dev);
	502
	503	return 0;
	504	}
	505
	506	static struct amba_id clcdfb_id_table[] = {
	507	{
	508	.id = 0x00041110,
e831556f	509	.mask = 0x000ffffe,
1da177e4 LT	510	},
	511	{ 0, 0 },
	512	};
	513
	514	static struct amba_driver clcd_driver = {
	515	.drv = {
e831556f	516	.name = "clcd-pl11x",
1da177e4 LT	517	},
	518	.probe = clcdfb_probe,
	519	.remove = clcdfb_remove,
	520	.id_table = clcdfb_id_table,
	521	};
	522
2c250134	523	static int __init amba_clcdfb_init(void)
1da177e4 LT	524	{
	525	if (fb_get_options("ambafb", NULL))
	526	return -ENODEV;
	527
	528	return amba_driver_register(&clcd_driver);
	529	}
	530
	531	module_init(amba_clcdfb_init);
	532
	533	static void __exit amba_clcdfb_exit(void)
	534	{
	535	amba_driver_unregister(&clcd_driver);
	536	}
	537
	538	module_exit(amba_clcdfb_exit);
	539
	540	MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
	541	MODULE_LICENSE("GPL");