# HG changeset patch
# User Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
# Date 1375316789 0
# Node ID 07b686248ab7fd67cfc43eb05cb48638897225a7
# Parent  c9768f5fb329156de9f786b30fe28fee3305cc44
pirexplore: finally got the backlight to turn on

diff -r c9768f5fb329 -r 07b686248ab7 target-utils/libcommon/Makefile
--- a/target-utils/libcommon/Makefile	Sun Jul 28 01:30:22 2013 +0000
+++ b/target-utils/libcommon/Makefile	Thu Aug 01 00:26:29 2013 +0000
@@ -6,7 +6,7 @@
 
 OBJS=	cmdentry.o dispatch.o hexarg.o parseargs.o serio.o serflush.o uartsel.o\
 	cmd_baud_switch.o cmd_dieid.o cmd_jump.o cmd_r8.o cmd_r16.o cmd_r32.o \
-	cmd_w8.o cmd_w16.o cmd_w32.o
+	cmd_w8.o cmd_w16.o cmd_w32.o osmodelay.o
 
 all:	libcommon.a
 
diff -r c9768f5fb329 -r 07b686248ab7 target-utils/libcommon/osmodelay.S
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/target-utils/libcommon/osmodelay.S	Thu Aug 01 00:26:29 2013 +0000
@@ -0,0 +1,30 @@
+/*
+ * This assembly module provides a replica of OsmocomBB's bogo-millisecond
+ * delay_ms() function.  It is literally a copy of what OsmocomBB's delay_ms()
+ * compiles to with their gcc version and their optimization settings, as seen
+ * by doing arm-elf-objdump on their lib/delay.o.
+ *
+ * This hack is intended for those cases where we have to copy OsmocomBB's
+ * black magic voodoo operations with no ability to understand what is actually
+ * needed, such as SPCA552E initialization on the Pirelli DP-L10.
+ */
+
+	.text
+	.code	32
+	.globl	osmo_delay_ms
+osmo_delay_ms:
+	mov     r3, #0
+	sub     sp, sp, #4
+	str     r3, [sp]
+	ldr     r3, =1300
+	mul     r3, r0, r3
+	b       2f
+1:	ldr     r2, [sp]
+	ldr     r2, [sp]
+	add     r2, r2, #1
+	str     r2, [sp]
+2:	ldr     r2, [sp]
+	cmp     r2, r3
+	bcc     1b
+	add     sp, sp, #4
+	bx      lr
diff -r c9768f5fb329 -r 07b686248ab7 target-utils/pirexplore/cmdtab.c
--- a/target-utils/pirexplore/cmdtab.c	Sun Jul 28 01:30:22 2013 +0000
+++ b/target-utils/pirexplore/cmdtab.c	Thu Aug 01 00:26:29 2013 +0000
@@ -9,6 +9,7 @@
 extern void cmd_rtc();
 extern void cmd_rtccomp();
 extern void cmd_spca();
+extern void cmd_spcainit();
 extern void cmd_w8();
 extern void cmd_w16();
 extern void cmd_w32();
@@ -23,6 +24,7 @@
 	{"rtc", cmd_rtc},
 	{"rtccomp", cmd_rtccomp},
 	{"spca", cmd_spca},
+	{"spcainit", cmd_spcainit},
 	{"w8", cmd_w8},
 	{"w16", cmd_w16},
 	{"w32", cmd_w32},
diff -r c9768f5fb329 -r 07b686248ab7 target-utils/pirexplore/lcd.c
--- a/target-utils/pirexplore/lcd.c	Sun Jul 28 01:30:22 2013 +0000
+++ b/target-utils/pirexplore/lcd.c	Thu Aug 01 00:26:29 2013 +0000
@@ -1,6 +1,17 @@
 #include <sys/types.h>
 #include "types.h"
 
+#define	GPIO_OUT_REG	(*(volatile u16 *)0xFFFE4802)
+#define	nCS4_ADDR0	(*(volatile u16 *)0x02800000)
+#define	nCS4_ADDR2	(*(volatile u16 *)0x02800002)
+
+fb_spca_write(addr, data)
+{
+	GPIO_OUT_REG &= 0xFF7F;
+	nCS4_ADDR0 = addr;
+	nCS4_ADDR2 = data;
+}
+
 void
 cmd_spca(argbulk)
 	char *argbulk;
@@ -18,6 +29,31 @@
 		printf("ERROR: arg2 must be a valid 16-bit hex value\n");
 		return;
 	}
-	*(volatile u16 *)0x02800000 = addr;
-	*(volatile u16 *)0x02800002 = data;
+	fb_spca_write(addr, data);
 }
+
+void
+cmd_spcainit()
+{
+	/*
+	 * Apparently we have to give it a reset pulse, then immediately
+	 * do the black magic register write sequence.
+	 */
+	GPIO_OUT_REG = 0x0000;
+	GPIO_OUT_REG = 0x0012;
+	/* non-understandable voodoo copied from OsmocomBB */
+	fb_spca_write(0x7e, 0x00);	/* internal register access */
+	osmo_delay_ms(10);
+	fb_spca_write(0x7a, 0x00);	/* keep CPU in reset state */
+	osmo_delay_ms(10);
+	fb_spca_write(0x7f, 0x00);	/* select main page */
+	osmo_delay_ms(5);
+	fb_spca_write(0x72, 0x07);	/* don't reshape timing, 16 bit mode */
+	fb_spca_write(0x14, 0x03);
+	fb_spca_write(0x7f, 0x00);	/* select main page */
+	osmo_delay_ms(5);
+	fb_spca_write(0x06, 0xff);
+	fb_spca_write(0x7f, 0x09);
+	fb_spca_write(0x19, 0x08);	/* backlight: 0x08 is on, 0x0c is off */
+	fb_spca_write(0x23, 0x18);
+}
diff -r c9768f5fb329 -r 07b686248ab7 target-utils/pirexplore/main.c
--- a/target-utils/pirexplore/main.c	Sun Jul 28 01:30:22 2013 +0000
+++ b/target-utils/pirexplore/main.c	Thu Aug 01 00:26:29 2013 +0000
@@ -25,11 +25,10 @@
 	 * Other register settings replicating what OsmocomBB does
 	 * in board/pirelli_dpl10/init.c
 	 */
-	*(volatile u16 *)0xfffef008 = 0x7090;
+	*(volatile u16 *)0xfffef008 = 0x7080;
 	*(volatile u16 *)0xfffef00a = 0x021F;
 	*(volatile u16 *)0xfffe4804 = 0xFF6D;
 	*(volatile u16 *)0xfffe4802 = 0x0000;
-	*(volatile u16 *)0xfffe4802 = 0x0012;
 	/* nCS4 setup for SPCA552E */
 	*(volatile u16 *)0xfffffb0a = 0x00A7;
 	for (;;) {