1 files changed, 299 insertions, 0 deletions
diff --git a/plat/arm/board/fvp/fconf/fconf_hw_config_getter.c b/plat/arm/board/fvp/fconf/fconf_hw_config_getter.c
new file mode 100644
index 0000000..45e3b7e
--- /dev/null
+++ b/plat/arm/board/fvp/fconf/fconf_hw_config_getter.c
@@ -0,0 +1,299 @@
+/*
+ * Copyright (c) 2020, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <inttypes.h>
+#include <stdint.h>
+
+#include <common/debug.h>
+#include <common/fdt_wrappers.h>
+#include <fconf_hw_config_getter.h>
+#include <libfdt.h>
+#include <plat/common/platform.h>
+
+struct gicv3_config_t gicv3_config;
+struct hw_topology_t soc_topology;
+struct uart_serial_config_t uart_serial_config;
+struct cpu_timer_t cpu_timer;
+
+#define ILLEGAL_ADDR	ULL(~0)
+
+int fconf_populate_gicv3_config(uintptr_t config)
+{
+	int err;
+	int node;
+	uintptr_t addr;
+
+	/* Necessary to work with libfdt APIs */
+	const void *hw_config_dtb = (const void *)config;
+
+	/*
+	 * Find the offset of the node containing "arm,gic-v3" compatible property.
+	 * Populating fconf strucutures dynamically is not supported for legacy
+	 * systems which use GICv2 IP. Simply skip extracting GIC properties.
+	 */
+	node = fdt_node_offset_by_compatible(hw_config_dtb, -1, "arm,gic-v3");
+	if (node < 0) {
+		WARN("FCONF: Unable to locate node with arm,gic-v3 compatible property\n");
+		return 0;
+	}
+	/* The GICv3 DT binding holds at least two address/size pairs,
+	 * the first describing the distributor, the second the redistributors.
+	 * See: bindings/interrupt-controller/arm,gic-v3.yaml
+	 */
+	err = fdt_get_reg_props_by_index(hw_config_dtb, node, 0, &addr, NULL);
+	if (err < 0) {
+		ERROR("FCONF: Failed to read GICD reg property of GIC node\n");
+		return err;
+	}
+	gicv3_config.gicd_base = addr;
+
+	err = fdt_get_reg_props_by_index(hw_config_dtb, node, 1, &addr, NULL);
+	if (err < 0) {
+		ERROR("FCONF: Failed to read GICR reg property of GIC node\n");
+	} else {
+		gicv3_config.gicr_base = addr;
+	}
+
+	return err;
+}
+
+int fconf_populate_topology(uintptr_t config)
+{
+	int err, node, cluster_node, core_node, thread_node;
+	uint32_t cluster_count = 0, max_cpu_per_cluster = 0, total_cpu_count = 0;
+	uint32_t max_pwr_lvl = 0;
+
+	/* Necessary to work with libfdt APIs */
+	const void *hw_config_dtb = (const void *)config;
+
+	/* Find the offset of the node containing "arm,psci-1.0" compatible property */
+	node = fdt_node_offset_by_compatible(hw_config_dtb, -1, "arm,psci-1.0");
+	if (node < 0) {
+		ERROR("FCONF: Unable to locate node with arm,psci-1.0 compatible property\n");
+		return node;
+	}
+
+	err = fdt_read_uint32(hw_config_dtb, node, "max-pwr-lvl", &max_pwr_lvl);
+	if (err < 0) {
+		/*
+		 * Some legacy FVP dts may not have this property. Assign the default
+		 * value.
+		 */
+		WARN("FCONF: Could not locate max-pwr-lvl property\n");
+		max_pwr_lvl = 2;
+	}
+
+	assert(max_pwr_lvl <= MPIDR_AFFLVL2);
+
+	/* Find the offset of the "cpus" node */
+	node = fdt_path_offset(hw_config_dtb, "/cpus");
+	if (node < 0) {
+		ERROR("FCONF: Node '%s' not found in hardware configuration dtb\n", "cpus");
+		return node;
+	}
+
+	/* A typical cpu-map node in a device tree is shown here for reference
+	cpu-map {
+		cluster0 {
+			core0 {
+				cpu = <&CPU0>;
+			};
+			core1 {
+				cpu = <&CPU1>;
+			};
+		};
+
+		cluster1 {
+			core0 {
+				cpu = <&CPU2>;
+			};
+			core1 {
+				cpu = <&CPU3>;
+			};
+		};
+	};
+	*/
+
+	/* Locate the cpu-map child node */
+	node = fdt_subnode_offset(hw_config_dtb, node, "cpu-map");
+	if (node < 0) {
+		ERROR("FCONF: Node '%s' not found in hardware configuration dtb\n", "cpu-map");
+		return node;
+	}
+
+	uint32_t cpus_per_cluster[PLAT_ARM_CLUSTER_COUNT] = {0};
+
+	/* Iterate through cluster nodes */
+	fdt_for_each_subnode(cluster_node, hw_config_dtb, node) {
+		assert(cluster_count < PLAT_ARM_CLUSTER_COUNT);
+
+		/* Iterate through core nodes */
+		fdt_for_each_subnode(core_node, hw_config_dtb, cluster_node) {
+			/* core nodes may have child nodes i.e., "thread" nodes */
+			if (fdt_first_subnode(hw_config_dtb, core_node) < 0) {
+				cpus_per_cluster[cluster_count]++;
+			} else {
+				/* Multi-threaded CPU description is found in dtb */
+				fdt_for_each_subnode(thread_node, hw_config_dtb, core_node) {
+					cpus_per_cluster[cluster_count]++;
+				}
+
+				/* Since in some dtbs, core nodes may not have thread node,
+				 * no need to error if even one child node is not found.
+				 */
+			}
+		}
+
+		/* Ensure every cluster node has at least 1 child node */
+		if (cpus_per_cluster[cluster_count] < 1U) {
+			ERROR("FCONF: Unable to locate the core node in cluster %d\n", cluster_count);
+			return -1;
+		}
+
+		VERBOSE("CLUSTER ID: %d cpu-count: %d\n", cluster_count,
+					cpus_per_cluster[cluster_count]);
+
+		/* Find the maximum number of cpus in any cluster */
+		max_cpu_per_cluster = MAX(max_cpu_per_cluster, cpus_per_cluster[cluster_count]);
+		total_cpu_count += cpus_per_cluster[cluster_count];
+		cluster_count++;
+	}
+
+
+	/* At least one cluster node is expected in hardware configuration dtb */
+	if (cluster_count < 1U) {
+		ERROR("FCONF: Unable to locate the cluster node in cpu-map node\n");
+		return -1;
+	}
+
+	soc_topology.plat_max_pwr_level = max_pwr_lvl;
+	soc_topology.plat_cluster_count = cluster_count;
+	soc_topology.cluster_cpu_count = max_cpu_per_cluster;
+	soc_topology.plat_cpu_count = total_cpu_count;
+
+	return 0;
+}
+
+int fconf_populate_uart_config(uintptr_t config)
+{
+	int uart_node, node, err;
+	uintptr_t addr;
+	const char *path;
+	uint32_t phandle;
+	uint64_t translated_addr;
+
+	/* Necessary to work with libfdt APIs */
+	const void *hw_config_dtb = (const void *)config;
+
+	/*
+	 * uart child node is indirectly referenced through its path which is
+	 * specified in the `serial1` property of the "aliases" node.
+	 * Note that TF-A boot console is mapped to serial0 while runtime
+	 * console is mapped to serial1.
+	 */
+
+	path = fdt_get_alias(hw_config_dtb, "serial1");
+	if (path == NULL) {
+		ERROR("FCONF: Could not read serial1 property in aliases node\n");
+		return -1;
+	}
+
+	/* Find the offset of the uart serial node */
+	uart_node = fdt_path_offset(hw_config_dtb, path);
+	if (uart_node < 0) {
+		ERROR("FCONF: Failed to locate uart serial node using its path\n");
+		return -1;
+	}
+
+	/* uart serial node has its offset and size of address in reg property */
+	err = fdt_get_reg_props_by_index(hw_config_dtb, uart_node, 0, &addr,
+						NULL);
+	if (err < 0) {
+		ERROR("FCONF: Failed to read reg property of '%s' node\n",
+			"uart serial");
+		return err;
+	}
+	VERBOSE("FCONF: UART node address: %lx\n", addr);
+
+	/*
+	 * Perform address translation of local device address to CPU address
+	 * domain.
+	 */
+	translated_addr = fdtw_translate_address(hw_config_dtb,
+						 uart_node, (uint64_t)addr);
+	if (translated_addr == ILLEGAL_ADDR) {
+		ERROR("FCONF: failed to translate UART node base address");
+		return -1;
+	}
+
+	uart_serial_config.uart_base = translated_addr;
+
+	VERBOSE("FCONF: UART serial device base address: %" PRIx64 "\n",
+		uart_serial_config.uart_base);
+
+	/*
+	 * The phandle of the DT node which captures the clock info of uart
+	 * serial node is specified in the "clocks" property.
+	 */
+	err = fdt_read_uint32(hw_config_dtb, uart_node, "clocks", &phandle);
+	if (err < 0) {
+		ERROR("FCONF: Could not read clocks property in uart serial node\n");
+		return err;
+	}
+
+	node = fdt_node_offset_by_phandle(hw_config_dtb, phandle);
+	if (node < 0) {
+		ERROR("FCONF: Failed to locate clk node using its path\n");
+		return node;
+	}
+
+	/*
+	 * Retrieve clock frequency. We assume clock provider generates a fixed
+	 * clock.
+	 */
+	err = fdt_read_uint32(hw_config_dtb, node, "clock-frequency",
+				&uart_serial_config.uart_clk);
+	if (err < 0) {
+		ERROR("FCONF: Could not read clock-frequency property in clk node\n");
+		return err;
+	}
+
+	VERBOSE("FCONF: UART serial device clk frequency: %x\n",
+		uart_serial_config.uart_clk);
+
+	return 0;
+}
+
+int fconf_populate_cpu_timer(uintptr_t config)
+{
+	int err, node;
+
+	/* Necessary to work with libfdt APIs */
+	const void *hw_config_dtb = (const void *)config;
+
+	/* Find the node offset point to "arm,armv8-timer" compatible property,
+	 * a per-core architected timer attached to a GIC to deliver its per-processor
+	 * interrupts via PPIs */
+	node = fdt_node_offset_by_compatible(hw_config_dtb, -1, "arm,armv8-timer");
+	if (node < 0) {
+		ERROR("FCONF: Unrecognized hardware configuration dtb (%d)\n", node);
+		return node;
+	}
+
+	/* Locate the cell holding the clock-frequency, an optional field */
+	err = fdt_read_uint32(hw_config_dtb, node, "clock-frequency", &cpu_timer.clock_freq);
+	if (err < 0) {
+		WARN("FCONF failed to read clock-frequency property\n");
+	}
+
+	return 0;
+}
+
+FCONF_REGISTER_POPULATOR(HW_CONFIG, gicv3_config, fconf_populate_gicv3_config);
+FCONF_REGISTER_POPULATOR(HW_CONFIG, topology, fconf_populate_topology);
+FCONF_REGISTER_POPULATOR(HW_CONFIG, uart_config, fconf_populate_uart_config);
+FCONF_REGISTER_POPULATOR(HW_CONFIG, cpu_timer, fconf_populate_cpu_timer);