Merge Linus master into drm-next

The merge is clean, but the arm build fails afterwards,
due to API changes in the regulator tree.

I've included the patch into the merge to fix the build.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 34 insertions, 21 deletions

diff --git a/arch/xtensa/platforms/xtfpga/lcd.c b/arch/xtensa/platforms/xtfpga/lcd.c
index 2872301598df..4dc0c1b43f4b 100644
--- a/arch/xtensa/platforms/xtfpga/lcd.c
+++ b/arch/xtensa/platforms/xtfpga/lcd.c
@@ -1,50 +1,63 @@
 /*
- * Driver for the LCD display on the Tensilica LX60 Board.
+ * Driver for the LCD display on the Tensilica XTFPGA board family.
+ * http://www.mytechcorp.com/cfdata/productFile/File1/MOC-16216B-B-A0A04.pdf
  *
  * 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.
  *
  * Copyright (C) 2001, 2006 Tensilica Inc.
+ * Copyright (C) 2015 Cadence Design Systems Inc.
  */
 
-/*
- *
- * FIXME: this code is from the examples from the LX60 user guide.
- *
- * The lcd_pause function does busy waiting, which is probably not
- * great. Maybe the code could be changed to use kernel timers, or
- * change the hardware to not need to wait.
- */
-
+#include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/io.h>
 
 #include <platform/hardware.h>
 #include <platform/lcd.h>
-#include <linux/delay.h>
 
-#define LCD_PAUSE_ITERATIONS	4000
+/* LCD instruction and data addresses. */
+#define LCD_INSTR_ADDR		((char *)IOADDR(CONFIG_XTFPGA_LCD_BASE_ADDR))
+#define LCD_DATA_ADDR		(LCD_INSTR_ADDR + 4)
+
 #define LCD_CLEAR		0x1
 #define LCD_DISPLAY_ON		0xc
 
 /* 8bit and 2 lines display */
 #define LCD_DISPLAY_MODE8BIT	0x38
+#define LCD_DISPLAY_MODE4BIT	0x28
 #define LCD_DISPLAY_POS		0x80
 #define LCD_SHIFT_LEFT		0x18
 #define LCD_SHIFT_RIGHT		0x1c
 
+static void lcd_put_byte(u8 *addr, u8 data)
+{
+#ifdef CONFIG_XTFPGA_LCD_8BIT_ACCESS
+	ACCESS_ONCE(*addr) = data;
+#else
+	ACCESS_ONCE(*addr) = data & 0xf0;
+	ACCESS_ONCE(*addr) = (data << 4) & 0xf0;
+#endif
+}
+
 static int __init lcd_init(void)
 {
-	*LCD_INSTR_ADDR = LCD_DISPLAY_MODE8BIT;
+	ACCESS_ONCE(*LCD_INSTR_ADDR) = LCD_DISPLAY_MODE8BIT;
 	mdelay(5);
-	*LCD_INSTR_ADDR = LCD_DISPLAY_MODE8BIT;
+	ACCESS_ONCE(*LCD_INSTR_ADDR) = LCD_DISPLAY_MODE8BIT;
 	udelay(200);
-	*LCD_INSTR_ADDR = LCD_DISPLAY_MODE8BIT;
+	ACCESS_ONCE(*LCD_INSTR_ADDR) = LCD_DISPLAY_MODE8BIT;
+	udelay(50);
+#ifndef CONFIG_XTFPGA_LCD_8BIT_ACCESS
+	ACCESS_ONCE(*LCD_INSTR_ADDR) = LCD_DISPLAY_MODE4BIT;
+	udelay(50);
+	lcd_put_byte(LCD_INSTR_ADDR, LCD_DISPLAY_MODE4BIT);
 	udelay(50);
-	*LCD_INSTR_ADDR = LCD_DISPLAY_ON;
+#endif
+	lcd_put_byte(LCD_INSTR_ADDR, LCD_DISPLAY_ON);
 	udelay(50);
-	*LCD_INSTR_ADDR = LCD_CLEAR;
+	lcd_put_byte(LCD_INSTR_ADDR, LCD_CLEAR);
 	mdelay(10);
 	lcd_disp_at_pos("XTENSA LINUX", 0);
 	return 0;
@@ -52,10 +65,10 @@ static int __init lcd_init(void)
 
 void lcd_disp_at_pos(char *str, unsigned char pos)
 {
-	*LCD_INSTR_ADDR = LCD_DISPLAY_POS | pos;
+	lcd_put_byte(LCD_INSTR_ADDR, LCD_DISPLAY_POS | pos);
 	udelay(100);
 	while (*str != 0) {
-		*LCD_DATA_ADDR = *str;
+		lcd_put_byte(LCD_DATA_ADDR, *str);
 		udelay(200);
 		str++;
 	}
@@ -63,13 +76,13 @@ void lcd_disp_at_pos(char *str, unsigned char pos)
 
 void lcd_shiftleft(void)
 {
-	*LCD_INSTR_ADDR = LCD_SHIFT_LEFT;
+	lcd_put_byte(LCD_INSTR_ADDR, LCD_SHIFT_LEFT);
 	udelay(50);
 }
 
 void lcd_shiftright(void)
 {
-	*LCD_INSTR_ADDR = LCD_SHIFT_RIGHT;
+	lcd_put_byte(LCD_INSTR_ADDR, LCD_SHIFT_RIGHT);
 	udelay(50);
 }