1 files changed, 443 insertions, 0 deletions
diff --git a/drivers/video/clps711xfb.c b/drivers/video/clps711xfb.c
new file mode 100644
index 00000000000..8692e002986
--- /dev/null
+++ b/drivers/video/clps711xfb.c
@@ -0,0 +1,443 @@
+/*
+ *  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,
+	.fb_cursor	= soft_cursor,
+};
+
+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");