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

source/bootloader/u-boot-2020.01/board/armltd/vexpress/vexpress_tc2.c

@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Linaro
+ * Jon Medhurst <tixy@linaro.org>
+ *
+ * TC2 specific code for Versatile Express.
+ */
+
+#include <asm/armv7.h>
+#include <asm/io.h>
+#include <asm/u-boot.h>
+#include <common.h>
+#include <linux/libfdt.h>
+
+#define SCC_BASE	0x7fff0000
+
+bool armv7_boot_nonsec_default(void)
+{
+#ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
+	return false;
+#else
+	/*
+	 * The Serial Configuration Controller (SCC) register at address 0x700
+	 * contains flags for configuring the behaviour of the Boot Monitor
+	 * (which CPUs execute from reset). Two of these bits are of interest:
+	 *
+	 * bit 12 = Use per-cpu mailboxes for power management
+	 * bit 13 = Power down the non-boot cluster
+	 *
+	 * It is only when both of these are false that U-Boot's current
+	 * implementation of 'nonsec' mode can work as expected because we
+	 * rely on getting all CPUs to execute _nonsec_init, so let's check that.
+	 */
+	return (readl((u32 *)(SCC_BASE + 0x700)) & ((1 << 12) | (1 << 13))) == 0;
+#endif
+}
+
+#ifdef CONFIG_OF_BOARD_SETUP
+int ft_board_setup(void *fdt, bd_t *bd)
+{
+	int offset, tmp, len;
+	const struct fdt_property *prop;
+	const char *cci_compatible = "arm,cci-400-ctrl-if";
+
+#ifdef CONFIG_ARMV7_NONSEC
+	if (!armv7_boot_nonsec())
+		return 0;
+#else
+	return 0;
+#endif
+	/* Booting in nonsec mode, disable CCI access */
+	offset = fdt_path_offset(fdt, "/cpus");
+	if (offset < 0) {
+		printf("couldn't find /cpus\n");
+		return offset;
+	}
+
+	/* delete cci-control-port in each cpu node */
+	for (tmp = fdt_first_subnode(fdt, offset); tmp >= 0;
+	     tmp = fdt_next_subnode(fdt, tmp))
+		fdt_delprop(fdt, tmp, "cci-control-port");
+
+	/* disable all ace cci slave ports */
+	offset = fdt_node_offset_by_prop_value(fdt, offset, "compatible",
+					       cci_compatible, 20);
+	while (offset > 0) {
+		prop = fdt_get_property(fdt, offset, "interface-type",
+					&len);
+		if (!prop)
+			continue;
+		if (len < 4)
+			continue;
+		if (strcmp(prop->data, "ace"))
+			continue;
+
+		fdt_setprop_string(fdt, offset, "status", "disabled");
+
+		offset = fdt_node_offset_by_prop_value(fdt, offset, "compatible",
+						       cci_compatible, 20);
+	}
+
+	return 0;
+}
+#endif /* CONFIG_OF_BOARD_SETUP */