[deliverable/linux.git] / drivers / video / clps711xfb.c

/*
 *  linux/drivers/video/clps711xfb.c
 *
 *  Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Framebuffer driver for the CLPS7111 and EP7212 processors.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>

#include <asm/hardware.h>
#include <asm/mach-types.h>
#include <asm/uaccess.h>

#include <asm/hardware/clps7111.h>
#include <asm/arch/syspld.h>

struct fb_info	*cfb;

#define CMAP_MAX_SIZE	16

/* The /proc entry for the backlight. */
static struct proc_dir_entry *clps7111fb_backlight_proc_entry = NULL;

static int clps7111fb_proc_backlight_read(char *page, char **start, off_t off,
		int count, int *eof, void *data);
static int clps7111fb_proc_backlight_write(struct file *file, 
		const char *buffer, unsigned long count, void *data);

/*
 * LCD AC Prescale.  This comes from the LCD panel manufacturers specifications.
 * This determines how many clocks + 1 of CL1 before the M signal toggles.
 * The number of lines on the display must not be divisible by this number.
 */
static unsigned int lcd_ac_prescale = 13;

/*
 *    Set a single color register. Return != 0 for invalid regno.
 */
static int
clps7111fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
		     u_int transp, struct fb_info *info)
{
	unsigned int level, mask, shift, pal;

	if (regno >= (1 << info->var.bits_per_pixel))
		return 1;

	/* gray = 0.30*R + 0.58*G + 0.11*B */
	level = (red * 77 + green * 151 + blue * 28) >> 20;

	/*
	 * On an LCD, a high value is dark, while a low value is light. 
	 * So we invert the level.
	 *
	 * This isn't true on all machines, so we only do it on EDB7211.
	 *  --rmk
	 */
	if (machine_is_edb7211()) {
		level = 15 - level;
	}

	shift = 4 * (regno & 7);
	level <<= shift;
	mask  = 15 << shift;
	level &= mask;

	regno = regno < 8 ? PALLSW : PALMSW;

	pal = clps_readl(regno);
	pal = (pal & ~mask) | level;
	clps_writel(pal, regno);

	return 0;
}

/*
 * Validate the purposed mode.
 */	
static int
clps7111fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	var->transp.msb_right	= 0;
	var->transp.offset	= 0;
	var->transp.length	= 0;
	var->red.msb_right	= 0;
	var->red.offset		= 0;
	var->red.length		= var->bits_per_pixel;
	var->green		= var->red;
	var->blue		= var->red;

	if (var->bits_per_pixel > 4) 
		return -EINVAL;

	return 0;
}

/*
 * Set the hardware state.
 */ 
static int 
clps7111fb_set_par(struct fb_info *info)
{
	unsigned int lcdcon, syscon, pixclock;

	switch (info->var.bits_per_pixel) {
	case 1:
		info->fix.visual = FB_VISUAL_MONO01;
		break;
	case 2:
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	case 4:
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	}

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

	lcdcon = (info->var.xres_virtual * info->var.yres_virtual * info->var.bits_per_pixel) / 128 - 1;
	lcdcon |= ((info->var.xres_virtual / 16) - 1) << 13;
	lcdcon |= lcd_ac_prescale << 25;

	/*
	 * Calculate pixel prescale value from the pixclock.  This is:
	 *  36.864MHz / pixclock_mhz - 1.
	 * However, pixclock is in picoseconds, so this ends up being:
	 *  36864000 * pixclock_ps / 10^12 - 1
	 * and this will overflow the 32-bit math.  We perform this as
	 * (9 * 4096000 == 36864000):
	 *  pixclock_ps * 9 * (4096000 / 10^12) - 1
	 */
	pixclock = 9 * info->var.pixclock / 244140 - 1;
	lcdcon |= pixclock << 19;

	if (info->var.bits_per_pixel == 4)
		lcdcon |= LCDCON_GSMD;
	if (info->var.bits_per_pixel >= 2)
		lcdcon |= LCDCON_GSEN;

	/*
	 * LCDCON must only be changed while the LCD is disabled
	 */
	syscon = clps_readl(SYSCON1);
	clps_writel(syscon & ~SYSCON1_LCDEN, SYSCON1);
	clps_writel(lcdcon, LCDCON);
	clps_writel(syscon | SYSCON1_LCDEN, SYSCON1);
	return 0;
}

static int clps7111fb_blank(int blank, struct fb_info *info)
{
    	if (blank) {
		if (machine_is_edb7211()) {
			/* Turn off the LCD backlight. */
			clps_writeb(clps_readb(PDDR) & ~EDB_PD3_LCDBL, PDDR);

			/* Power off the LCD DC-DC converter. */
			clps_writeb(clps_readb(PDDR) & ~EDB_PD1_LCD_DC_DC_EN, PDDR);

			/* Delay for a little while (half a second). */
			udelay(100);

			/* Power off the LCD panel. */
			clps_writeb(clps_readb(PDDR) & ~EDB_PD2_LCDEN, PDDR);

			/* Power off the LCD controller. */
			clps_writel(clps_readl(SYSCON1) & ~SYSCON1_LCDEN, 
					SYSCON1);
		}
	} else {
		if (machine_is_edb7211()) {
			/* Power up the LCD controller. */
			clps_writel(clps_readl(SYSCON1) | SYSCON1_LCDEN,
					SYSCON1);

			/* Power up the LCD panel. */
			clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR);

			/* Delay for a little while. */
			udelay(100);

			/* Power up the LCD DC-DC converter. */
			clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN,
					PDDR);

			/* Turn on the LCD backlight. */
			clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR);
		}
	}
	return 0;
}

static struct fb_ops clps7111fb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= clps7111fb_check_var,
	.fb_set_par	= clps7111fb_set_par,
	.fb_setcolreg	= clps7111fb_setcolreg,
	.fb_blank	= clps7111fb_blank,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};

static int 
clps7111fb_proc_backlight_read(char *page, char **start, off_t off,
		int count, int *eof, void *data)
{
	/* We need at least two characters, one for the digit, and one for
	 * the terminating NULL. */
	if (count < 2) 
		return -EINVAL;

	if (machine_is_edb7211()) {
		return sprintf(page, "%d\n", 
				(clps_readb(PDDR) & EDB_PD3_LCDBL) ? 1 : 0);
	}

	return 0;
}

static int 
clps7111fb_proc_backlight_write(struct file *file, const char *buffer, 
		unsigned long count, void *data)
{
	unsigned char char_value;
	int value;

	if (count < 1) {
		return -EINVAL;
	}

	if (copy_from_user(&char_value, buffer, 1)) 
		return -EFAULT;

	value = char_value - '0';

	if (machine_is_edb7211()) {
		unsigned char port_d;

		port_d = clps_readb(PDDR);

		if (value) {
			port_d |= EDB_PD3_LCDBL;
		} else {
			port_d &= ~EDB_PD3_LCDBL;
		}

		clps_writeb(port_d, PDDR);
	}

	return count;
}

static void __init clps711x_guess_lcd_params(struct fb_info *info)
{
	unsigned int lcdcon, syscon, size;
	unsigned long phys_base = PAGE_OFFSET;
	void *virt_base = (void *)PAGE_OFFSET;

	info->var.xres_virtual	 = 640;
	info->var.yres_virtual	 = 240;
	info->var.bits_per_pixel = 4;
	info->var.activate	 = FB_ACTIVATE_NOW;
	info->var.height	 = -1;
	info->var.width		 = -1;
	info->var.pixclock	 = 93006; /* 10.752MHz pixel clock */

	/*
	 * If the LCD controller is already running, decode the values
	 * in LCDCON to xres/yres/bpp/pixclock/acprescale
	 */
	syscon = clps_readl(SYSCON1);
	if (syscon & SYSCON1_LCDEN) {
		lcdcon = clps_readl(LCDCON);

		/*
		 * Decode GSMD and GSEN bits to bits per pixel
		 */
		switch (lcdcon & (LCDCON_GSMD | LCDCON_GSEN)) {
		case LCDCON_GSMD | LCDCON_GSEN:
			info->var.bits_per_pixel = 4;
			break;

		case LCDCON_GSEN:
			info->var.bits_per_pixel = 2;
			break;

		default:
			info->var.bits_per_pixel = 1;
			break;
		}

		/*
		 * Decode xres/yres
		 */
		info->var.xres_virtual = (((lcdcon >> 13) & 0x3f) + 1) * 16;
		info->var.yres_virtual = (((lcdcon & 0x1fff) + 1) * 128) /
					  (info->var.xres_virtual *
					   info->var.bits_per_pixel);

		/*
		 * Calculate pixclock
		 */
		info->var.pixclock = (((lcdcon >> 19) & 0x3f) + 1) * 244140 / 9;

		/*
		 * Grab AC prescale
		 */
		lcd_ac_prescale = (lcdcon >> 25) & 0x1f;
	}

	info->var.xres = info->var.xres_virtual;
	info->var.yres = info->var.yres_virtual;
	info->var.grayscale = info->var.bits_per_pixel > 1;

	size = info->var.xres * info->var.yres * info->var.bits_per_pixel / 8;

	/*
	 * Might be worth checking to see if we can use the on-board
	 * RAM if size here...
	 * CLPS7110 - no on-board SRAM
	 * EP7212   - 38400 bytes
	 */
	if (size <= 38400) {
		printk(KERN_INFO "CLPS711xFB: could use on-board SRAM?\n");
	}

	if ((syscon & SYSCON1_LCDEN) == 0) {
		/*
		 * The display isn't running.  Ensure that
		 * the display memory is empty.
		 */
		memset(virt_base, 0, size);
	}

	info->screen_base    = virt_base;
	info->fix.smem_start = phys_base;
	info->fix.smem_len   = PAGE_ALIGN(size);
	info->fix.type       = FB_TYPE_PACKED_PIXELS;
}

int __init clps711xfb_init(void)
{
	int err = -ENOMEM;

	if (fb_get_options("clps711xfb", NULL))
		return -ENODEV;

	cfb = kmalloc(sizeof(*cfb), GFP_KERNEL);
	if (!cfb)
		goto out;

	memset(cfb, 0, sizeof(*cfb));
	strcpy(cfb->fix.id, "clps711x");

	cfb->fbops		= &clps7111fb_ops;
	cfb->flags		= FBINFO_DEFAULT;

	clps711x_guess_lcd_params(cfb);

	fb_alloc_cmap(&cfb->cmap, CMAP_MAX_SIZE, 0);

	/* Register the /proc entries. */
	clps7111fb_backlight_proc_entry = create_proc_entry("backlight", 0444,
		&proc_root);
	if (clps7111fb_backlight_proc_entry == NULL) {
		printk("Couldn't create the /proc entry for the backlight.\n");
		return -EINVAL;
	}

	clps7111fb_backlight_proc_entry->read_proc = 
		&clps7111fb_proc_backlight_read;
	clps7111fb_backlight_proc_entry->write_proc = 
		&clps7111fb_proc_backlight_write;

	/*
	 * Power up the LCD
	 */
	if (machine_is_p720t()) {
		PLD_LCDEN = PLD_LCDEN_EN;
		PLD_PWR |= (PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON);
	}

	if (machine_is_edb7211()) {
		/* Power up the LCD panel. */
		clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR);

		/* Delay for a little while. */
		udelay(100);

		/* Power up the LCD DC-DC converter. */
		clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN, PDDR);

		/* Turn on the LCD backlight. */
		clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR);
	}

	err = register_framebuffer(cfb);

out:	return err;
}

static void __exit clps711xfb_exit(void)
{
	unregister_framebuffer(cfb);
	kfree(cfb);

	/*
	 * Power down the LCD
	 */
	if (machine_is_p720t()) {
		PLD_LCDEN = 0;
		PLD_PWR &= ~(PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON);
	}
}

module_init(clps711xfb_init);
module_exit(clps711xfb_exit);

MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("CLPS711x framebuffer driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/video/clps711xfb.c
	3	*
	4	* Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	* Framebuffer driver for the CLPS7111 and EP7212 processors.
	21	*/
	22	#include <linux/module.h>
	23	#include <linux/kernel.h>
	24	#include <linux/slab.h>
	25	#include <linux/fb.h>
	26	#include <linux/init.h>
	27	#include <linux/proc_fs.h>
	28	#include <linux/delay.h>
	29
	30	#include <asm/hardware.h>
	31	#include <asm/mach-types.h>
	32	#include <asm/uaccess.h>
	33
	34	#include <asm/hardware/clps7111.h>
	35	#include <asm/arch/syspld.h>
	36
	37	struct fb_info *cfb;
	38
	39	#define CMAP_MAX_SIZE 16
	40
	41	/* The /proc entry for the backlight. */
	42	static struct proc_dir_entry *clps7111fb_backlight_proc_entry = NULL;
	43
	44	static int clps7111fb_proc_backlight_read(char page, char *start, off_t off,
	45	int count, int eof, void data);
	46	static int clps7111fb_proc_backlight_write(struct file *file,
	47	const char buffer, unsigned long count, void data);
	48
	49	/*
	50	* LCD AC Prescale. This comes from the LCD panel manufacturers specifications.
	51	* This determines how many clocks + 1 of CL1 before the M signal toggles.
	52	* The number of lines on the display must not be divisible by this number.
	53	*/
	54	static unsigned int lcd_ac_prescale = 13;
	55
	56	/*
	57	* Set a single color register. Return != 0 for invalid regno.
	58	*/
	59	static int
	60	clps7111fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
	61	u_int transp, struct fb_info *info)
	62	{
	63	unsigned int level, mask, shift, pal;
	64
65	if (regno >= (1 << info->var.bits_per_pixel))
66	return 1;
67
68	/* gray = 0.30R + 0.58G + 0.11B /
69	level = (red * 77 + green * 151 + blue * 28) >> 20;
70
71	/*
72	* On an LCD, a high value is dark, while a low value is light.
73	* So we invert the level.
74	*
75	* This isn't true on all machines, so we only do it on EDB7211.
76	* --rmk
77	*/
78	if (machine_is_edb7211()) {
79	level = 15 - level;
80	}
81
82	shift = 4 * (regno & 7);
83	level <<= shift;
84	mask = 15 << shift;
85	level &= mask;
86
87	regno = regno < 8 ? PALLSW : PALMSW;
88
89	pal = clps_readl(regno);
90	pal = (pal & ~mask) \| level;
91	clps_writel(pal, regno);
92
93	return 0;
94	}
95
96	/*
97	* Validate the purposed mode.
98	*/
99	static int
100	clps7111fb_check_var(struct fb_var_screeninfo var, struct fb_info info)
101	{
102	var->transp.msb_right = 0;
103	var->transp.offset = 0;
104	var->transp.length = 0;
105	var->red.msb_right = 0;
106	var->red.offset = 0;
107	var->red.length = var->bits_per_pixel;
108	var->green = var->red;
109	var->blue = var->red;
110
111	if (var->bits_per_pixel > 4)
112	return -EINVAL;
113
114	return 0;
115	}
116
117	/*
118	* Set the hardware state.
119	*/
120	static int
121	clps7111fb_set_par(struct fb_info *info)
122	{
123	unsigned int lcdcon, syscon, pixclock;
124
125	switch (info->var.bits_per_pixel) {
126	case 1:
127	info->fix.visual = FB_VISUAL_MONO01;
128	break;
129	case 2:
130	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
131	break;
132	case 4:
133	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
134	break;
135	}
136
137	info->fix.line_length = info->var.xres_virtual * info->var.bits_per_pixel / 8;
138
139	lcdcon = (info->var.xres_virtual * info->var.yres_virtual * info->var.bits_per_pixel) / 128 - 1;
140	lcdcon \|= ((info->var.xres_virtual / 16) - 1) << 13;
141	lcdcon \|= lcd_ac_prescale << 25;
142
143	/*
144	* Calculate pixel prescale value from the pixclock. This is:
145	* 36.864MHz / pixclock_mhz - 1.
146	* However, pixclock is in picoseconds, so this ends up being:
147	* 36864000 * pixclock_ps / 10^12 - 1
148	* and this will overflow the 32-bit math. We perform this as
149	* (9 * 4096000 == 36864000):
150	* pixclock_ps * 9 * (4096000 / 10^12) - 1
151	*/
152	pixclock = 9 * info->var.pixclock / 244140 - 1;
153	lcdcon \|= pixclock << 19;
154
155	if (info->var.bits_per_pixel == 4)
156	lcdcon \|= LCDCON_GSMD;
157	if (info->var.bits_per_pixel >= 2)
158	lcdcon \|= LCDCON_GSEN;
159
160	/*
161	* LCDCON must only be changed while the LCD is disabled
162	*/
163	syscon = clps_readl(SYSCON1);
164	clps_writel(syscon & ~SYSCON1_LCDEN, SYSCON1);
165	clps_writel(lcdcon, LCDCON);
166	clps_writel(syscon \| SYSCON1_LCDEN, SYSCON1);
167	return 0;
168	}
169
170	static int clps7111fb_blank(int blank, struct fb_info *info)
171	{
172	if (blank) {
173	if (machine_is_edb7211()) {
174	/* Turn off the LCD backlight. */
175	clps_writeb(clps_readb(PDDR) & ~EDB_PD3_LCDBL, PDDR);
176
177	/* Power off the LCD DC-DC converter. */
178	clps_writeb(clps_readb(PDDR) & ~EDB_PD1_LCD_DC_DC_EN, PDDR);
179
180	/* Delay for a little while (half a second). */
181	udelay(100);
182
183	/* Power off the LCD panel. */
184	clps_writeb(clps_readb(PDDR) & ~EDB_PD2_LCDEN, PDDR);
185
186	/* Power off the LCD controller. */
187	clps_writel(clps_readl(SYSCON1) & ~SYSCON1_LCDEN,
188	SYSCON1);
189	}
190	} else {
191	if (machine_is_edb7211()) {
192	/* Power up the LCD controller. */
193	clps_writel(clps_readl(SYSCON1) \| SYSCON1_LCDEN,
194	SYSCON1);
195
196	/* Power up the LCD panel. */
197	clps_writeb(clps_readb(PDDR) \| EDB_PD2_LCDEN, PDDR);
198
199	/* Delay for a little while. */
200	udelay(100);
201
202	/* Power up the LCD DC-DC converter. */
203	clps_writeb(clps_readb(PDDR) \| EDB_PD1_LCD_DC_DC_EN,
204	PDDR);
205
206	/* Turn on the LCD backlight. */
207	clps_writeb(clps_readb(PDDR) \| EDB_PD3_LCDBL, PDDR);
208	}
209	}
210	return 0;
211	}
212
213	static struct fb_ops clps7111fb_ops = {
214	.owner = THIS_MODULE,
215	.fb_check_var = clps7111fb_check_var,
216	.fb_set_par = clps7111fb_set_par,
217	.fb_setcolreg = clps7111fb_setcolreg,
218	.fb_blank = clps7111fb_blank,
219	.fb_fillrect = cfb_fillrect,
220	.fb_copyarea = cfb_copyarea,
221	.fb_imageblit = cfb_imageblit,
1da177e4 LT	222	};
	223
	224	static int
	225	clps7111fb_proc_backlight_read(char page, char *start, off_t off,
	226	int count, int eof, void data)
	227	{
	228	/* We need at least two characters, one for the digit, and one for
	229	* the terminating NULL. */
	230	if (count < 2)
	231	return -EINVAL;
	232
	233	if (machine_is_edb7211()) {
	234	return sprintf(page, "%d\n",
	235	(clps_readb(PDDR) & EDB_PD3_LCDBL) ? 1 : 0);
	236	}
	237
	238	return 0;
	239	}
	240
	241	static int
	242	clps7111fb_proc_backlight_write(struct file file, const char buffer,
	243	unsigned long count, void *data)
	244	{
	245	unsigned char char_value;
	246	int value;
	247
	248	if (count < 1) {
	249	return -EINVAL;
	250	}
	251
	252	if (copy_from_user(&char_value, buffer, 1))
	253	return -EFAULT;
	254
	255	value = char_value - '0';
	256
	257	if (machine_is_edb7211()) {
	258	unsigned char port_d;
	259
	260	port_d = clps_readb(PDDR);
	261
	262	if (value) {
	263	port_d \|= EDB_PD3_LCDBL;
	264	} else {
	265	port_d &= ~EDB_PD3_LCDBL;
	266	}
	267
	268	clps_writeb(port_d, PDDR);
	269	}
	270
	271	return count;
	272	}
	273
	274	static void __init clps711x_guess_lcd_params(struct fb_info *info)
	275	{
	276	unsigned int lcdcon, syscon, size;
	277	unsigned long phys_base = PAGE_OFFSET;
	278	void virt_base = (void )PAGE_OFFSET;
	279
	280	info->var.xres_virtual = 640;
	281	info->var.yres_virtual = 240;
	282	info->var.bits_per_pixel = 4;
	283	info->var.activate = FB_ACTIVATE_NOW;
	284	info->var.height = -1;
	285	info->var.width = -1;
286	info->var.pixclock = 93006; /* 10.752MHz pixel clock */
287
288	/*
289	* If the LCD controller is already running, decode the values
290	* in LCDCON to xres/yres/bpp/pixclock/acprescale
291	*/
292	syscon = clps_readl(SYSCON1);
293	if (syscon & SYSCON1_LCDEN) {
294	lcdcon = clps_readl(LCDCON);
295
296	/*
297	* Decode GSMD and GSEN bits to bits per pixel
298	*/
299	switch (lcdcon & (LCDCON_GSMD \| LCDCON_GSEN)) {
300	case LCDCON_GSMD \| LCDCON_GSEN:
301	info->var.bits_per_pixel = 4;
302	break;
303
304	case LCDCON_GSEN:
305	info->var.bits_per_pixel = 2;
306	break;
307
308	default:
309	info->var.bits_per_pixel = 1;
310	break;
311	}
312
313	/*
314	* Decode xres/yres
315	*/
316	info->var.xres_virtual = (((lcdcon >> 13) & 0x3f) + 1) * 16;
317	info->var.yres_virtual = (((lcdcon & 0x1fff) + 1) * 128) /
318	(info->var.xres_virtual *
319	info->var.bits_per_pixel);
320
321	/*
322	* Calculate pixclock
323	*/
324	info->var.pixclock = (((lcdcon >> 19) & 0x3f) + 1) * 244140 / 9;
325
326	/*
327	* Grab AC prescale
328	*/
329	lcd_ac_prescale = (lcdcon >> 25) & 0x1f;
330	}
331
332	info->var.xres = info->var.xres_virtual;
333	info->var.yres = info->var.yres_virtual;
334	info->var.grayscale = info->var.bits_per_pixel > 1;
335
336	size = info->var.xres * info->var.yres * info->var.bits_per_pixel / 8;
337
338	/*
339	* Might be worth checking to see if we can use the on-board
340	* RAM if size here...
341	* CLPS7110 - no on-board SRAM
342	* EP7212 - 38400 bytes
343	*/
344	if (size <= 38400) {
345	printk(KERN_INFO "CLPS711xFB: could use on-board SRAM?\n");
346	}
347
348	if ((syscon & SYSCON1_LCDEN) == 0) {
349	/*
350	* The display isn't running. Ensure that
351	* the display memory is empty.
352	*/
353	memset(virt_base, 0, size);
354	}
355
356	info->screen_base = virt_base;
357	info->fix.smem_start = phys_base;
358	info->fix.smem_len = PAGE_ALIGN(size);
359	info->fix.type = FB_TYPE_PACKED_PIXELS;
360	}
361
362	int __init clps711xfb_init(void)
363	{
364	int err = -ENOMEM;
365
366	if (fb_get_options("clps711xfb", NULL))
367	return -ENODEV;
368
369	cfb = kmalloc(sizeof(*cfb), GFP_KERNEL);
370	if (!cfb)
371	goto out;
372
373	memset(cfb, 0, sizeof(*cfb));
374	strcpy(cfb->fix.id, "clps711x");
375
376	cfb->fbops = &clps7111fb_ops;
377	cfb->flags = FBINFO_DEFAULT;
378
379	clps711x_guess_lcd_params(cfb);
380
381	fb_alloc_cmap(&cfb->cmap, CMAP_MAX_SIZE, 0);
382
383	/* Register the /proc entries. */
384	clps7111fb_backlight_proc_entry = create_proc_entry("backlight", 0444,
385	&proc_root);
386	if (clps7111fb_backlight_proc_entry == NULL) {
387	printk("Couldn't create the /proc entry for the backlight.\n");
388	return -EINVAL;
389	}
390
391	clps7111fb_backlight_proc_entry->read_proc =
392	&clps7111fb_proc_backlight_read;
393	clps7111fb_backlight_proc_entry->write_proc =
394	&clps7111fb_proc_backlight_write;
395
396	/*
397	* Power up the LCD
398	*/
399	if (machine_is_p720t()) {
400	PLD_LCDEN = PLD_LCDEN_EN;
401	PLD_PWR \|= (PLD_S4_ON\|PLD_S3_ON\|PLD_S2_ON\|PLD_S1_ON);
402	}
403
404	if (machine_is_edb7211()) {
405	/* Power up the LCD panel. */
406	clps_writeb(clps_readb(PDDR) \| EDB_PD2_LCDEN, PDDR);
407
408	/* Delay for a little while. */
409	udelay(100);
410
411	/* Power up the LCD DC-DC converter. */
412	clps_writeb(clps_readb(PDDR) \| EDB_PD1_LCD_DC_DC_EN, PDDR);
413
414	/* Turn on the LCD backlight. */
415	clps_writeb(clps_readb(PDDR) \| EDB_PD3_LCDBL, PDDR);
416	}
417
418	err = register_framebuffer(cfb);
419
420	out: return err;
421	}
422
423	static void __exit clps711xfb_exit(void)
424	{
425	unregister_framebuffer(cfb);
426	kfree(cfb);
427
428	/*
429	* Power down the LCD
430	*/
431	if (machine_is_p720t()) {
432	PLD_LCDEN = 0;
433	PLD_PWR &= ~(PLD_S4_ON\|PLD_S3_ON\|PLD_S2_ON\|PLD_S1_ON);
434	}
435	}
436
437	module_init(clps711xfb_init);
438	module_exit(clps711xfb_exit);
439
440	MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
441	MODULE_DESCRIPTION("CLPS711x framebuffer driver");
442	MODULE_LICENSE("GPL");