Kernel 5.4 RUTX support

common/package/boot/uboot-ipq40xx/src/post/board/lwmon5/watchdog.c

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+/*
+ * (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.
+ */
+
+#include <post.h>
+
+#if CONFIG_POST & CONFIG_SYS_POST_WATCHDOG
+
+#include <watchdog.h>
+#include <asm/ppc4xx-gpio.h>
+#include <asm/io.h>
+
+static uint watchdog_magic_read(void)
+{
+	return in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
+		CONFIG_SYS_WATCHDOG_MAGIC_MASK;
+}
+
+static void watchdog_magic_write(uint value)
+{
+	out_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR, value |
+		(in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
+			~CONFIG_SYS_WATCHDOG_MAGIC_MASK));
+}
+
+int sysmon1_post_test(int flags)
+{
+	if (gpio_read_in_bit(CONFIG_SYS_GPIO_SYSMON_STATUS) == 0) {
+		/*
+		 * 3.1. GPIO62 is low
+		 * Assuming system voltage failure.
+		 */
+		post_log("sysmon1 Abnormal voltage detected (GPIO62)\n");
+		post_log("POST sysmon1 FAILED\n");
+		return 1;
+	} else {
+		post_log("sysmon1 PASSED\n");
+	}
+
+	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() != CONFIG_SYS_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(CONFIG_SYS_WATCHDOG_MAGIC);
+
+		ints = disable_interrupts ();
+		/* 3.2.2. strobe watchdog once */
+		WATCHDOG_RESET();
+		out_be32((void *)CONFIG_SYS_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 *)CONFIG_SYS_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 *)CONFIG_SYS_WATCHDOG_TIME_ADDR);
+		if (time > 90 ) { /* ms*/
+			post_log("hw watchdog time : %u ms, passed ", time);
+			/* 3.3.2. Set scratch register 1 to 0x0000xxxx */
+			watchdog_magic_write(0);
+			return 0;
+		} else {
+			/*test minimum watchdogtime */
+			post_log("hw watchdog time : %u ms, failed ", time);
+			return 2;
+		}
+	}
+	return -1;
+}
+
+#endif /* CONFIG_POST & CONFIG_SYS_POST_WATCHDOG */