GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/post/drivers/i2c.c

@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ */
+
+/*
+ * I2C test
+ *
+ * For verifying the I2C bus, a full I2C bus scanning is performed.
+ *
+ * #ifdef CONFIG_SYS_POST_I2C_ADDRS
+ *   The test is considered as passed if all the devices and only the devices
+ *   in the list are found.
+ *   #ifdef CONFIG_SYS_POST_I2C_IGNORES
+ *     Ignore devices listed in CONFIG_SYS_POST_I2C_IGNORES.  These devices
+ *     are optional or not vital to board functionality.
+ *   #endif
+ * #else [ ! CONFIG_SYS_POST_I2C_ADDRS ]
+ *   The test is considered as passed if any I2C device is found.
+ * #endif
+ */
+
+#include <common.h>
+#include <post.h>
+#include <i2c.h>
+
+#if CONFIG_POST & CONFIG_SYS_POST_I2C
+
+static int i2c_ignore_device(unsigned int chip)
+{
+#ifdef CONFIG_SYS_POST_I2C_IGNORES
+	const unsigned char i2c_ignore_list[] = CONFIG_SYS_POST_I2C_IGNORES;
+	int i;
+
+	for (i = 0; i < sizeof(i2c_ignore_list); i++)
+		if (i2c_ignore_list[i] == chip)
+			return 1;
+#endif
+
+	return 0;
+}
+
+int i2c_post_test (int flags)
+{
+	unsigned int i;
+#ifndef CONFIG_SYS_POST_I2C_ADDRS
+	/* Start at address 1, address 0 is the general call address */
+	for (i = 1; i < 128; i++) {
+		if (i2c_ignore_device(i))
+			continue;
+		if (i2c_probe (i) == 0)
+			return 0;
+	}
+
+	/* No devices found */
+	return -1;
+#else
+	unsigned int ret  = 0;
+	int j;
+	unsigned char i2c_addr_list[] = CONFIG_SYS_POST_I2C_ADDRS;
+
+	/* Start at address 1, address 0 is the general call address */
+	for (i = 1; i < 128; i++) {
+		if (i2c_ignore_device(i))
+			continue;
+		if (i2c_probe(i) != 0)
+			continue;
+
+		for (j = 0; j < sizeof(i2c_addr_list); ++j) {
+			if (i == i2c_addr_list[j]) {
+				i2c_addr_list[j] = 0xff;
+				break;
+			}
+		}
+
+		if (j == sizeof(i2c_addr_list)) {
+			ret = -1;
+			post_log("I2C: addr %02x not expected\n", i);
+		}
+	}
+
+	for (i = 0; i < sizeof(i2c_addr_list); ++i) {
+		if (i2c_addr_list[i] == 0xff)
+			continue;
+		if (i2c_ignore_device(i2c_addr_list[i]))
+			continue;
+		post_log("I2C: addr %02x did not respond\n", i2c_addr_list[i]);
+		ret = -1;
+	}
+
+	return ret;
+#endif
+}
+
+#endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */