video: add amba-clcd prime-cell

This adds support for the CLCD logic cell. It accepts precompiled
register values for specific configuration through a board-supplied
data structure.  It is used by the Nomadik nhk8815, added by a later
patch in this series.

Signed-off-by: Alessandro Rubini <rubini@unipv.it>
Acked-by: Andrea Gallo <andrea.gallo@stericsson.com>

1 files changed, 79 insertions, 0 deletions

diff --git a/drivers/video/amba.c b/drivers/video/amba.c
new file mode 100644
index 0000000..ffa1c39
--- /dev/null
+++ b/drivers/video/amba.c
@@ -0,0 +1,79 @@
+/*
+ * Driver for AMBA PrimeCell CLCD
+ *
+ * Copyright (C) 2009 Alessandro Rubini
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <lcd.h>
+#include <amba_clcd.h>
+
+/* These variables are required by lcd.c -- although it sets them by itself */
+int lcd_line_length;
+int lcd_color_fg;
+int lcd_color_bg;
+void *lcd_base;
+void *lcd_console_address;
+short console_col;
+short console_row;
+
+/*
+ * To use this driver you need to provide the following in board files:
+ *	a panel_info definition
+ *	an lcd_enable function (can't define a weak default with current code)
+ */
+
+/* There is nothing to do with color registers, we use true color */
+void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
+{
+	return;
+}
+
+/* Low level initialization of the logic cell: depends on panel_info */
+void lcd_ctrl_init(void *lcdbase)
+{
+	struct clcd_config *config;
+	struct clcd_registers *regs;
+	u32 cntl;
+
+	config = panel_info.priv;
+	regs = config->address;
+	cntl = config->cntl & ~CNTL_LCDEN;
+
+	/* Lazily, just copy the registers over: first control with disable */
+	writel(cntl, &regs->cntl);
+
+	writel(config->tim0, &regs->tim0);
+	writel(config->tim1, &regs->tim1);
+	writel(config->tim2, &regs->tim2);
+	writel(config->tim3, &regs->tim3);
+	writel((u32)lcdbase, &regs->ubas);
+	/* finally, enable */
+	writel(cntl | CNTL_LCDEN, &regs->cntl);
+}
+
+/* This is trivial, and copied from atmel_lcdfb.c */
+ulong calc_fbsize(void)
+{
+	return ((panel_info.vl_col * panel_info.vl_row *
+		NBITS(panel_info.vl_bpix)) / 8) + PAGE_SIZE;
+}