Tegra: handler for per-soc early setup

This patch adds a weak handler for early platform setup which
can be overriden by the soc-specific handlers to perform any
early setup tasks.

Change-Id: I1a7a98d59b2332a3030c6dca5a9b7be977177326
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

plat/nvidia/tegra/common/tegra_bl31_setup.c

@@ -79,6 +79,17 @@ static plat_params_from_bl2_t plat_bl31_params_from_bl2 = {
  ******************************************************************************/
 extern uint64_t ns_image_entrypoint;
 
+/*******************************************************************************
+ * The following platform setup functions are weakly defined. They
+ * provide typical implementations that will be overridden by a SoC.
+ ******************************************************************************/
+#pragma weak plat_early_platform_setup
+
+void plat_early_platform_setup(void)
+{
+	; /* do nothing */
+}
+
 /*******************************************************************************
  * Return a pointer to the 'entry_point_info' structure of the next image for
  * security state specified. BL33 corresponds to the non-secure image type
@@ -160,6 +171,9 @@ void bl31_early_platform_setup(bl31_params_t *from_bl2,
 	/* Initialise crash console */
 	plat_crash_console_init();
 
+	/* Early platform setup for Tegra SoCs */
+	plat_early_platform_setup();
+
 	INFO("BL3-1: Boot CPU: %s Processor [%lx]\n", (impl == DENVER_IMPL) ?
 		"Denver" : "ARM", read_mpidr());
 }

plat/nvidia/tegra/include/tegra_private.h

@@ -83,6 +83,7 @@ int tegra_prepare_cpu_on_finish(unsigned long mpidr);
 /* Declarations for tegra_bl31_setup.c */
 plat_params_from_bl2_t *bl31_get_plat_params(void);
 int bl31_check_ns_address(uint64_t base, uint64_t size_in_bytes);
+void plat_early_platform_setup(void);
 
 /* Declarations for tegra_delay_timer.c */
 void tegra_delay_timer_init(void);