fconf: Extract Timer clock freq from HW_CONFIG dtb
Extract Timer clock frequency from the timer node in
HW_CONFIG dtb. The first timer is a per-core architected timer attached
to a GIC to deliver its per-processor interrupts via PPIs.
Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: I2f4b27c48e4c79208dab9f03c768d9221ba6ca86
diff --git a/plat/arm/board/fvp/fconf/fconf_hw_config_getter.c b/plat/arm/board/fvp/fconf/fconf_hw_config_getter.c
index 8172a6e..35a777b 100644
--- a/plat/arm/board/fvp/fconf/fconf_hw_config_getter.c
+++ b/plat/arm/board/fvp/fconf/fconf_hw_config_getter.c
@@ -14,6 +14,7 @@
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)
@@ -260,9 +261,36 @@
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);
diff --git a/plat/arm/board/fvp/include/fconf_hw_config_getter.h b/plat/arm/board/fvp/include/fconf_hw_config_getter.h
index b53e00a..ca85f7a 100644
--- a/plat/arm/board/fvp/include/fconf_hw_config_getter.h
+++ b/plat/arm/board/fvp/include/fconf_hw_config_getter.h
@@ -11,10 +11,9 @@
/* Hardware Config related getter */
#define hw_config__gicv3_config_getter(prop) gicv3_config.prop
-
#define hw_config__topology_getter(prop) soc_topology.prop
-
#define hw_config__uart_serial_config_getter(prop) uart_serial_config.prop
+#define hw_config__cpu_timer_getter(prop) cpu_timer.prop
struct gicv3_config_t {
uint64_t gicd_base;
@@ -33,12 +32,17 @@
uint32_t uart_clk;
};
+struct cpu_timer_t {
+ uint32_t clock_freq;
+};
+
int fconf_populate_gicv3_config(uintptr_t config);
int fconf_populate_topology(uintptr_t config);
int fconf_populate_uart_config(uintptr_t config);
+int fconf_populate_cpu_timer(uintptr_t config);
extern struct gicv3_config_t gicv3_config;
extern struct hw_topology_t soc_topology;
extern struct uart_serial_config_t uart_serial_config;
-
+extern struct cpu_timer_t cpu_timer;
#endif /* FCONF_HW_CONFIG_GETTER_H */