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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
This commit is contained in:
laurenw-arm 2020-02-06 11:42:18 -06:00
parent ccf5863231
commit 8aa374b9fe
2 changed files with 35 additions and 3 deletions
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28
plat/arm/board/fvp/fconf/fconf_hw_config_getter.c
View File

@ -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 @@ int fconf_populate_uart_config(uintptr_t config)
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);

10
plat/arm/board/fvp/include/fconf_hw_config_getter.h
View File

@ -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 @@ struct uart_serial_config_t {
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 */