The patch adds new POST tests for the Lwmon5 board. These are:

* External Watchdog test;
* dsPIC tests;
* FPGA test;
* GDC test;
* Sysmon tests.

Signed-off-by: Dmitry Rakhchev <rda@emcraft.com>
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>

7 files changed, 785 insertions, 0 deletions

diff --git a/post/board/lwmon5/Makefile b/post/board/lwmon5/Makefile
new file mode 100644
index 0000000000..5a92d1ce73
--- /dev/null
+++ b/post/board/lwmon5/Makefile
@@ -0,0 +1,28 @@
+#
+# (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
+#
+# Developed for DENX Software Engineering GmbH
+#
+# 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
+
+LIB	= libpostlwmon5.a
+
+COBJS	= sysmon.o watchdog.o dspic.o fpga.o dsp.o gdc.o
+
+include $(TOPDIR)/post/rules.mk
diff --git a/post/board/lwmon5/dsp.c b/post/board/lwmon5/dsp.c
new file mode 100644
index 0000000000..1946f09d6b
--- /dev/null
+++ b/post/board/lwmon5/dsp.c
@@ -0,0 +1,57 @@
+/*
+ * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
+ *
+ * Developed for DENX Software Engineering GmbH
+ *
+ * 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>
+
+#ifdef CONFIG_POST
+
+#include <post.h>
+
+
+#if CONFIG_POST & CFG_POST_DSP
+#include <asm/io.h>
+
+/* This test verifies DSP status bits in FPGA */
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define DSP_STATUS_REG 0xC4000008
+
+int dsp_post_test(int flags)
+{
+	uint   read_value;
+	int    ret;
+
+	ret = 0;
+	read_value = in_be32((void *)DSP_STATUS_REG) & 0x3;
+	if (read_value != 0x3) {
+		post_log("\nDSP status read %08X\n", read_value);
+		ret = 1;
+	}
+
+	return ret;
+}
+
+#endif /* CONFIG_POST & CFG_POST_DSP */
+#endif /* CONFIG_POST */
diff --git a/post/board/lwmon5/dspic.c b/post/board/lwmon5/dspic.c
new file mode 100644
index 0000000000..897a852e40
--- /dev/null
+++ b/post/board/lwmon5/dspic.c
@@ -0,0 +1,108 @@
+/*
+ * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
+ *
+ * Developed for DENX Software Engineering GmbH
+ *
+ * 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>
+
+#ifdef CONFIG_POST
+
+/* There are two tests for dsPIC currently implemented:
+ * 1. dsPIC ready test. Done in board_early_init_f(). Only result verified here.
+ * 2. dsPIC POST result test.  This test gets dsPIC POST codes and version.
+ */
+
+#include <post.h>
+
+#include <i2c.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define DSPIC_POST_ERROR_REG	0x800
+#define DSPIC_SYS_ERROR_REG	0x802
+#define DSPIC_VERSION_REG	0x804
+
+#if CONFIG_POST & CFG_POST_BSPEC1
+
+/* Verify that dsPIC ready test done early at hw init passed ok */
+int dspic_init_post_test(int flags)
+{
+	if (in_be32((void *)CFG_DSPIC_TEST_ADDR) & CFG_DSPIC_TEST_MASK) {
+		post_log("dsPIC init test failed\n");
+		return 1;
+	}
+
+	return 0;
+}
+
+#endif /* CONFIG_POST & CFG_POST_BSPEC1 */
+
+#if CONFIG_POST & CFG_POST_BSPEC2
+/* Read a register from the dsPIC. */
+int dspic_read(ushort reg)
+{
+	uchar buf[2];
+
+	if (i2c_read(CFG_I2C_DSPIC_IO_ADDR, reg, 2, buf, 2))
+		return -1;
+
+	return (uint)((buf[0] << 8) | buf[1]);
+}
+
+/* Verify error codes regs, display version */
+int dspic_post_test(int flags)
+{
+	int data;
+	int ret = 0;
+
+	post_log("\n");
+	data = dspic_read(DSPIC_VERSION_REG);
+	if (data == -1) {
+		post_log("dsPIC : failed read version\n");
+		ret = 1;
+	} else {
+		post_log("dsPIC version: %u.%u\n",
+			(data >> 8) & 0xFF, data & 0xFF);
+	}
+
+	data = dspic_read(DSPIC_POST_ERROR_REG);
+	if (data != 0) ret = 1;
+	if (data == -1) {
+		post_log("dsPIC : failed read POST code\n");
+	} else {
+		post_log("dsPIC POST code 0x%04X\n", data);
+	}
+
+	data = dspic_read(DSPIC_SYS_ERROR_REG);
+	if (data != 0) ret = 1;
+	if (data == -1) {
+		post_log("dsPIC : failed read system error\n");
+	} else {
+		post_log("dsPIC SYS-ERROR code: 0x%04X\n", data);
+	}
+
+	return ret;
+}
+
+#endif /* CONFIG_POST & CFG_POST_BSPEC2 */
+#endif /* CONFIG_POST */
diff --git a/post/board/lwmon5/fpga.c b/post/board/lwmon5/fpga.c
new file mode 100644
index 0000000000..7a36c168c9
--- /dev/null
+++ b/post/board/lwmon5/fpga.c
@@ -0,0 +1,103 @@
+/*
+ * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
+ *
+ * Developed for DENX Software Engineering GmbH
+ *
+ * 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>
+
+#ifdef CONFIG_POST
+
+/* This test performs testing of FPGA SCRATCH register,
+ * gets FPGA version and run get_ram_size() on FPGA memory
+ */
+
+#include <post.h>
+
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define FPGA_SCRATCH_REG	0xC4000050
+#define FPGA_VERSION_REG	0xC4000040
+#define FPGA_RAM_START		0xC4200000
+#define FPGA_RAM_END		0xC4203FFF
+
+#define FPGA_PWM_CTRL_REG	0xC4000020
+#define FPGA_PWM_TV_REG		0xC4000024
+
+/* Turn on backlight, set brightness */
+void fpga_backlight_enable(int pwm)
+{
+	out_be16((void *)FPGA_PWM_CTRL_REG, 0x0701);
+	out_be16((void *)FPGA_PWM_TV_REG, pwm);
+}
+
+#if CONFIG_POST & CFG_POST_BSPEC3
+
+static int one_scratch_test(uint value)
+{
+	uint read_value;
+	int ret = 0;
+
+	out_be32((void *)FPGA_SCRATCH_REG, value);
+	/* read other location (protect against data lines capacity) */
+	ret = in_be16((void *)FPGA_VERSION_REG);
+	/* verify test pattern */
+	read_value = in_be32((void *)FPGA_SCRATCH_REG);
+	if (read_value != value) {
+		post_log("FPGA SCRATCH test failed write %08X, read %08X\n",
+			value, read_value);
+		ret = 1;
+	}
+
+	return ret;
+}
+
+/* Verify FPGA, get version & memory size */
+int fpga_post_test(int flags)
+{
+	uint   old_value;
+	ushort version;
+	uint   read_value;
+	int    ret = 0;
+
+	post_log("\n");
+	old_value = in_be32((void *)FPGA_SCRATCH_REG);
+
+	if (one_scratch_test(0x55555555))
+		ret = 1;
+	if (one_scratch_test(0xAAAAAAAA))
+		ret = 1;
+
+	out_be32((void *)FPGA_SCRATCH_REG, old_value);
+
+	version = in_be16((void *)FPGA_VERSION_REG);
+	post_log("FPGA : version %u.%u\n",
+		(version >> 8) & 0xFF, version & 0xFF);
+
+	read_value = get_ram_size((void *)CFG_FPGA_BASE_1, 0x4000);
+	post_log("FPGA RAM size: %d bytes\n", read_value);
+
+	return ret;
+}
+
+#endif /* CONFIG_POST & CFG_POST_BSPEC3 */
+#endif /* CONFIG_POST */
diff --git a/post/board/lwmon5/gdc.c b/post/board/lwmon5/gdc.c
new file mode 100644
index 0000000000..42da370192
--- /dev/null
+++ b/post/board/lwmon5/gdc.c
@@ -0,0 +1,93 @@
+/*
+ * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
+ *
+ * Developed for DENX Software Engineering GmbH
+ *
+ * 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>
+
+#ifdef CONFIG_POST
+
+/* This test attempts to verify board GDC. A scratch register tested, then
+ * simple memory test (get_ram_size()) run over GDC memory.
+ */
+
+#include <post.h>
+
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define GDC_SCRATCH_REG 0xC1FF8044
+#define GDC_VERSION_REG 0xC1FF8084
+#define GDC_RAM_START   0xC0000000
+#define GDC_RAM_END     0xC2000000
+
+#if CONFIG_POST & CFG_POST_BSPEC4
+
+static int gdc_test_reg_one(uint value)
+{
+	int ret = 0;
+	uint read_value;
+
+	/* write test pattern */
+	out_be32((void *)GDC_SCRATCH_REG, value);
+	/* read other location (protect against data lines capacity) */
+	ret = in_be32((void *)GDC_RAM_START);
+	/* verify test pattern */
+	read_value = in_be32((void *)GDC_SCRATCH_REG);
+	if (read_value != value) {
+		post_log("GDC SCRATCH test failed write %08X, read %08X\n",
+			value, read_value);
+		ret = 1;
+	}
+
+	return ret;
+}
+
+/* Verify GDC, get memory size */
+int gdc_post_test(int flags)
+{
+	uint   old_value;
+	int    ret = 0;
+
+	post_log("\n");
+	old_value = in_be32((void *)GDC_SCRATCH_REG);
+
+	if (gdc_test_reg_one(0x55555555))
+		ret = 1;
+	if (gdc_test_reg_one(0xAAAAAAAA))
+		ret = 1;
+
+	out_be32((void *)GDC_SCRATCH_REG, old_value);
+
+	old_value = in_be32((void *)GDC_VERSION_REG);
+	post_log("GDC chip version %u.%u, year %04X\n",
+		(old_value >> 8) & 0xFF, old_value & 0xFF,
+		(old_value >> 16) & 0xFFFF);
+
+	old_value = get_ram_size((void *)GDC_RAM_START,
+				 GDC_RAM_END - GDC_RAM_START);
+	post_log("GDC RAM size: %d bytes\n", old_value);
+
+	return ret;
+}
+#endif /* CONFIG_POST & CFG_POST_BSPEC4 */
+#endif /* CONFIG_POST */
diff --git a/post/board/lwmon5/sysmon.c b/post/board/lwmon5/sysmon.c
new file mode 100644
index 0000000000..0eae4c1515
--- /dev/null
+++ b/post/board/lwmon5/sysmon.c
@@ -0,0 +1,265 @@
+/*
+ * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
+ *
+ * Developed for DENX Software Engineering GmbH
+ *
+ * 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 <post.h>
+#include <common.h>
+
+#ifdef CONFIG_POST
+
+/*
+ * SYSMON test
+ *
+ * This test performs the system hardware monitoring.
+ * The test passes when all the following voltages and temperatures
+ * are within allowed ranges:
+ *
+ * Temperature                -40 .. +85 C
+ * +5V                      +4.75 .. +5.25 V
+ * +5V standby              +4.75 .. +5.25 V
+ *
+ * LCD backlight is not enabled if temperature values are not within
+ * allowed ranges (-30 .. + 80). The brightness of backlite can be
+ * controlled by setting "brightness" enviroment variable. Default value is 50%
+ *
+ * See the list of all parameters in the sysmon_table below
+ */
+
+#include <post.h>
+#include <watchdog.h>
+#include <i2c.h>
+
+#if CONFIG_POST & CFG_POST_SYSMON
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define DEFAULT_BRIGHTNESS 50
+
+/* from dspic.c */
+extern int dspic_read(ushort reg);
+/* from fpga.c */
+extern void fpga_backlight_enable(int v);
+
+static int sysmon_temp_invalid;
+
+#define	RELOC(x) if (x != NULL) x = (void *) ((ulong) (x) + gd->reloc_off)
+
+typedef struct sysmon_s sysmon_t;
+typedef struct sysmon_table_s sysmon_table_t;
+
+static void sysmon_dspic_init (sysmon_t * this);
+static int sysmon_dspic_read (sysmon_t * this, uint addr);
+static void sysmon_backlight_disable (sysmon_table_t * this);
+static void sysmon_backlight_enable (sysmon_table_t * this);
+
+struct sysmon_s
+{
+	uchar	chip;
+	void	(*init)(sysmon_t *);
+	int	(*read)(sysmon_t *, uint);
+};
+
+static sysmon_t sysmon_dspic =
+	{CFG_I2C_DSPIC_IO_ADDR, sysmon_dspic_init, sysmon_dspic_read};
+
+static sysmon_t * sysmon_list[] =
+{
+	&sysmon_dspic,
+	NULL
+};
+
+struct sysmon_table_s
+{
+	char *		name;
+	char *		unit_name;
+	sysmon_t *	sysmon;
+	void		(*exec_before)(sysmon_table_t *);
+	void		(*exec_after)(sysmon_table_t *);
+
+	int		unit_precision;
+	int		unit_div;
+	int		unit_min;
+	int		unit_max;
+	uint		val_mask;
+	uint		val_min;
+	uint		val_max;
+	int		val_valid;
+	uint		val_min_alt;
+	uint		val_max_alt;
+	int		val_valid_alt;
+	uint		addr;
+};
+
+static sysmon_table_t sysmon_table[] =
+{
+    {"Temperature", " C", &sysmon_dspic, NULL, sysmon_backlight_disable,
+     1, 1, -32768, 32767, 0xFFFF, 0x8000-40, 0x8000+85, 0,
+                                  0x8000-30, 0x8000+80, 0, 0x12BC},
+
+    {"+ 5 V", "V", &sysmon_dspic, NULL, NULL,
+     100, 1000, -0x8000, 0x7FFF, 0xFFFF, 0x8000+4750, 0x8000+5250, 0,
+                                         0x8000+4750, 0x8000+5250, 0, 0x12CA},
+
+    {"+ 5 V standby", "V", &sysmon_dspic, NULL, sysmon_backlight_enable,
+     100, 1000, -0x8000, 0x7FFF, 0xFFFF, 0x8000+4750, 0x8000+5250, 0,
+                                         0x8000+4750, 0x8000+5250, 0, 0x12C6},
+};
+static int sysmon_table_size = sizeof(sysmon_table) / sizeof(sysmon_table[0]);
+
+int sysmon_init_f (void)
+{
+	sysmon_t ** l;
+
+	for (l = sysmon_list; *l; l++)
+		(*l)->init(*l);
+
+	return 0;
+}
+
+void sysmon_reloc (void)
+{
+	sysmon_t ** l;
+	sysmon_table_t * t;
+
+	for (l = sysmon_list; *l; l++) {
+		RELOC(*l);
+		RELOC((*l)->init);
+		RELOC((*l)->read);
+	}
+
+	for (t = sysmon_table; t < sysmon_table + sysmon_table_size; t ++) {
+		RELOC(t->exec_before);
+		RELOC(t->exec_after);
+		RELOC(t->sysmon);
+	}
+}
+
+static char *sysmon_unit_value (sysmon_table_t *s, uint val)
+{
+	static char buf[32];
+	char *p, sign;
+	int decimal, frac;
+	int unit_val;
+
+	unit_val =
+	    s->unit_min + (s->unit_max - s->unit_min) * val / s->val_mask;
+
+	if (val == -1)
+		return "I/O ERROR";
+
+	if (unit_val < 0) {
+		sign = '-';
+		unit_val = -unit_val;
+	} else
+		sign = '+';
+
+	p = buf + sprintf(buf, "%c%2d", sign, unit_val / s->unit_div);
+
+
+	frac = unit_val % s->unit_div;
+
+	frac /= (s->unit_div / s->unit_precision);
+
+	decimal = s->unit_precision;
+
+	if (decimal != 1)
+		*p++ = '.';
+	for (decimal /= 10; decimal != 0; decimal /= 10)
+		*p++ = '0' + (frac / decimal) % 10;
+	strcpy(p, s->unit_name);
+
+	return buf;
+}
+
+static void sysmon_dspic_init (sysmon_t * this)
+{
+}
+
+static int sysmon_dspic_read (sysmon_t * this, uint addr)
+{
+	int res = dspic_read(addr);
+
+	/* To fit into the table range we should add 0x8000 */
+	return (res == -1) ? -1 : (res + 0x8000);
+}
+
+static void sysmon_backlight_disable (sysmon_table_t * this)
+{
+	if (!this->val_valid_alt)
+		sysmon_temp_invalid = 1;
+}
+
+static void sysmon_backlight_enable (sysmon_table_t * this)
+{
+	char * param;
+	int rc;
+
+	if (!sysmon_temp_invalid) {
+		param = getenv("brightness");
+		rc = param ? simple_strtol(param, NULL, 10) : -1;
+		if (rc >= 0)
+			fpga_backlight_enable(rc);
+		else
+			fpga_backlight_enable(DEFAULT_BRIGHTNESS);
+	}
+}
+
+int sysmon_post_test (int flags)
+{
+	int res = 0;
+	sysmon_table_t * t;
+	int val;
+
+	for (t = sysmon_table; t < sysmon_table + sysmon_table_size; t ++) {
+		if (t->exec_before)
+			t->exec_before(t);
+
+		val = t->sysmon->read(t->sysmon, t->addr);
+		if (val != -1) {
+			t->val_valid = val >= t->val_min && val <= t->val_max;
+			t->val_valid_alt = val >= t->val_min_alt && val <= t->val_max_alt;
+		} else {
+			t->val_valid = 0;
+			t->val_valid_alt = 0;
+		}
+
+		if (t->exec_after)
+			t->exec_after(t);
+
+		if ((!t->val_valid) || (flags & POST_MANUAL)) {
+			printf("%-17s = %-10s ", t->name, sysmon_unit_value(t, val));
+			printf("allowed range");
+			printf(" %-8s ..", sysmon_unit_value(t, t->val_min));
+			printf(" %-8s", sysmon_unit_value(t, t->val_max));
+			printf("     %s\n", t->val_valid ? "OK" : "FAIL");
+		}
+
+		if (!t->val_valid)
+			res = 1;
+	}
+
+	return res;
+}
+
+#endif /* CONFIG_POST & CFG_POST_SYSMON */
+#endif /* CONFIG_POST */
diff --git a/post/board/lwmon5/watchdog.c b/post/board/lwmon5/watchdog.c
new file mode 100644
index 0000000000..8348346a18
--- /dev/null
+++ b/post/board/lwmon5/watchdog.c
@@ -0,0 +1,131 @@
+/*
+ * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
+ *
+ * Developed for DENX Software Engineering GmbH
+ *
+ * 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>
+
+/* This test verifies if the reason of last reset was an abnormal voltage
+ * condition, than it performs watchdog test, measuing time required to
+ * trigger watchdog reset.
+ */
+
+#ifdef CONFIG_POST
+
+#include <post.h>
+
+#if CONFIG_POST & CFG_POST_WATCHDOG
+
+#include <watchdog.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+
+static uint watchdog_magic_read(void)
+{
+	return in_be32((void *)CFG_WATCHDOG_FLAGS_ADDR) &
+		CFG_WATCHDOG_MAGIC_MASK;
+}
+
+static void watchdog_magic_write(uint value)
+{
+	out_be32((void *)CFG_WATCHDOG_FLAGS_ADDR, value |
+		(in_be32((void *)CFG_WATCHDOG_FLAGS_ADDR) &
+			~CFG_WATCHDOG_MAGIC_MASK));
+}
+
+int sysmon1_post_test(int flags)
+{
+	if (gpio_read_in_bit(CFG_GPIO_SYSMON_STATUS)) {
+		/* 3.1. GPIO62 is low
+		 * Assuming system voltage failure.
+		 */
+		post_log("Abnormal voltage detected (GPIO62)\n");
+		return 1;
+	}
+
+	return 0;
+}
+
+int lwmon5_watchdog_post_test(int flags)
+{
+	/* On each reset scratch register 1 should be tested,
+	 * but first test GPIO62:
+	 */
+	if (!(flags & POST_MANUAL) && sysmon1_post_test(flags)) {
+		/* 3.1. GPIO62 is low
+		 * Assuming system voltage failure.
+		 */
+		/* 3.1.1. Set scratch register 1 to 0x0000xxxx */
+		watchdog_magic_write(0);
+		/* 3.1.2. Mark test as failed due to voltage?! */
+		return 1;
+	}
+
+	if (watchdog_magic_read() != CFG_WATCHDOG_MAGIC) {
+		/* 3.2. Scratch register 1 differs from magic value 0x1248xxxx
+		 * Assuming PowerOn
+		 */
+		int ints;
+		ulong base;
+		ulong time;
+
+		/* 3.2.1. Set magic value to scratch register */
+		watchdog_magic_write(CFG_WATCHDOG_MAGIC);
+
+		ints = disable_interrupts ();
+		/* 3.2.2. strobe watchdog once */
+		WATCHDOG_RESET();
+		out_be32((void *)CFG_WATCHDOG_TIME_ADDR, 0);
+		/* 3.2.3. save time of strobe in scratch register 2 */
+		base = post_time_ms (0);
+
+		/* 3.2.4. Wait for 150 ms (enough for reset to happen) */
+		while ((time = post_time_ms (base)) < 150)
+			out_be32((void *)CFG_WATCHDOG_TIME_ADDR, time);
+		if (ints)
+			enable_interrupts ();
+
+		/* 3.2.5. Reset didn't happen. - Set 0x0000xxxx
+		 * into scratch register 1
+		 */
+		watchdog_magic_write(0);
+		/* 3.2.6. Mark test as failed. */
+		post_log("hw watchdog time : %u ms, failed ", time);
+		return 2;
+	} else {
+		/* 3.3. Scratch register matches magic value 0x1248xxxx
+		 * Assume this is watchdog-initiated reset
+		 */
+		ulong time;
+		/* 3.3.1. So, the test succeed, save measured time to syslog. */
+		time = in_be32((void *)CFG_WATCHDOG_TIME_ADDR);
+		post_log("hw watchdog time : %u ms, passed ", time);
+		/* 3.3.2. Set scratch register 1 to 0x0000xxxx */
+		watchdog_magic_write(0);
+		return 0;
+	}
+	return -1;
+}
+
+
+#endif /* CONFIG_POST & CFG_POST_WATCHDOG */
+#endif /* CONFIG_POST */