TWL4030 Add power reset button

The Zoom2 power reset button is on the top right side of the
main board.  Press and hold for about to 8 seconds to completely
reset the board.

Some of the beta boards have a hardware problem that prevents
using this feature.  If is difficult to further characterize the
boards that fail.  So disable resetting for all beta boards.

The Zoom1 reset button is the red circle on the top right,
front of the board.  Press and hold the button for 8 seconds to
completely reset the board.

After analyzing beagle, it was determined that other boards
that use the twl4030 for power managment can also make use
this function.

The resetting is done by the power management part of the twl4030.
Since there is no existing drivers/power, add one.

The compilation of power/twl4030.h is controlled by the config
variable CONFIG_TWL4030_POWER

Signed-off-by: Tom Rix <Tom.Rix@windriver.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Heiko Schocher <hs@denx.de>

8 files changed, 131 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index ef535ed..55d33fd 100644
--- a/Makefile
+++ b/Makefile
@@ -221,6 +221,7 @@ LIBS += drivers/net/phy/libphy.a
 LIBS += drivers/net/sk98lin/libsk98lin.a
 LIBS += drivers/pci/libpci.a
 LIBS += drivers/pcmcia/libpcmcia.a
+LIBS += drivers/power/libpower.a
 LIBS += drivers/spi/libspi.a
 ifeq ($(CPU),mpc83xx)
 LIBS += drivers/qe/qe.a
diff --git a/board/omap3/zoom1/zoom1.c b/board/omap3/zoom1/zoom1.c
index db4d087..94437d5 100644
--- a/board/omap3/zoom1/zoom1.c
+++ b/board/omap3/zoom1/zoom1.c
@@ -31,6 +31,7 @@
  * MA 02111-1307 USA
  */
 #include <common.h>
+#include <twl4030.h>
 #include <asm/io.h>
 #include <asm/arch/mux.h>
 #include <asm/arch/sys_proto.h>
@@ -62,6 +63,14 @@ int misc_init_r(void)
 {
 	power_init_r();
 	dieid_num_r();
+
+	/*
+	 * Board Reset
+	 * The board is reset by holding the red button on the
+	 * top right front face for eight seconds.
+	 */
+	twl4030_power_reset_init();
+
 	return 0;
 }
 
diff --git a/board/omap3/zoom2/zoom2.c b/board/omap3/zoom2/zoom2.c
index 08fdafb..d0fd55b 100644
--- a/board/omap3/zoom2/zoom2.c
+++ b/board/omap3/zoom2/zoom2.c
@@ -32,6 +32,7 @@
 #ifdef CONFIG_STATUS_LED
 #include <status_led.h>
 #endif
+#include <twl4030.h>
 #include <asm/io.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/mem.h>
@@ -156,6 +157,19 @@ int misc_init_r(void)
 	zoom2_identify();
 	power_init_r();
 	dieid_num_r();
+
+	/*
+	 * Board Reset
+	 * The board is reset by holding the the large button
+	 * on the top right side of the main board for
+	 * eight seconds.
+	 *
+	 * There are reported problems of some beta boards
+	 * continously resetting.  For those boards, disable resetting.
+	 */
+	if (ZOOM2_REVISION_PRODUCTION <= zoom2_get_revision())
+		twl4030_power_reset_init();
+
 	return 0;
 }
 
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
new file mode 100644
index 0000000..dd06514
--- /dev/null
+++ b/drivers/power/Makefile
@@ -0,0 +1,47 @@
+#
+# Copyright (c) 2009 Wind River Systems, Inc.
+# Tom Rix <Tom.Rix at windriver.com>
+#
+# 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 $(TOPDIR)/config.mk
+
+LIB 	:= $(obj)libpower.a
+
+COBJS-$(CONFIG_TWL4030_POWER)	+= twl4030.o
+
+COBJS	:= $(COBJS-y)
+SRCS 	:= $(COBJS:.o=.c)
+OBJS 	:= $(addprefix $(obj),$(COBJS))
+
+all:	$(LIB)
+
+$(LIB):	$(obj).depend $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
+
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+########################################################################
diff --git a/drivers/power/twl4030.c b/drivers/power/twl4030.c
new file mode 100644
index 0000000..70d4eeb
--- /dev/null
+++ b/drivers/power/twl4030.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2009 Wind River Systems, Inc.
+ * Tom Rix <Tom.Rix at windriver.com>
+ *
+ * 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
+ *
+ * Derived from code on omapzoom, git://git.omapzoom.com/repo/u-boot.git
+ *
+ * Copyright (C) 2007-2009 Texas Instruments, Inc.
+ */
+
+#include <twl4030.h>
+
+/*
+ * Power Reset
+ */
+void twl4030_power_reset_init(void)
+{
+	u8 val = 0;
+	if (twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER, &val,
+				TWL4030_PM_MASTER_P1_SW_EVENTS)) {
+		printf("Error:TWL4030: failed to read the power register\n");
+		printf("Could not initialize hardware reset\n");
+	} else {
+		val |= TWL4030_PM_MASTER_SW_EVENTS_STOPON_PWRON;
+		if (twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER, val,
+					 TWL4030_PM_MASTER_P1_SW_EVENTS)) {
+			printf("Error:TWL4030: failed to write the power register\n");
+			printf("Could not initialize hardware reset\n");
+		}
+	}
+}
+
+
diff --git a/include/configs/omap3_zoom1.h b/include/configs/omap3_zoom1.h
index 4034ea4..a4eb7fd 100644
--- a/include/configs/omap3_zoom1.h
+++ b/include/configs/omap3_zoom1.h
@@ -126,6 +126,11 @@
 #define CONFIG_DRIVER_OMAP34XX_I2C	1
 
 /*
+ * TWL4030
+ */
+#define CONFIG_TWL4030_POWER		1
+
+/*
  * Board NAND Info.
  */
 #define CONFIG_NAND_OMAP_GPMC
diff --git a/include/configs/omap3_zoom2.h b/include/configs/omap3_zoom2.h
index 701a296..534eecd 100644
--- a/include/configs/omap3_zoom2.h
+++ b/include/configs/omap3_zoom2.h
@@ -147,6 +147,11 @@
 #define CONFIG_DRIVER_OMAP34XX_I2C	1
 
 /*
+ * TWL4030
+ */
+#define CONFIG_TWL4030_POWER		1
+
+/*
  * Board NAND Info.
  */
 #define CONFIG_NAND_OMAP_GPMC
diff --git a/include/twl4030.h b/include/twl4030.h
index c304b54..e7c90b6 100644
--- a/include/twl4030.h
+++ b/include/twl4030.h
@@ -242,4 +242,7 @@ static inline int twl4030_i2c_read_u8(u8 chip_no, u8 *val, u8 reg)
 	return i2c_read(chip_no, reg, 1, val, 1);
 }
 
+/* For hardware resetting */
+void twl4030_power_reset_init(void);
+
 #endif /* TWL4030_H */