zynqmp: Introduce zynqmp_get_bootmode

Provide a function to retrieve the bootmode.
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>

plat/xilinx/zynqmp/aarch64/zynqmp_common.c

@@ -271,6 +271,13 @@ int zynqmp_is_pmu_up(void)
 	return zynqmp_pmufw_present;
 }
 
+unsigned int zynqmp_get_bootmode(void)
+{
+	uint32_t r = mmio_read_32(CRL_APB_BOOT_MODE_USER);
+
+	return r & CRL_APB_BOOT_MODE_MASK;
+}
+
 void zynqmp_config_setup(void)
 {
 	zynqmp_discover_pmufw();

plat/xilinx/zynqmp/zynqmp_def.h

@@ -63,6 +63,7 @@
 #define CRL_APB_BASE			0xFF5E0000
 #define CRL_APB_RPLL_CTRL		(CRL_APB_BASE + 0x30)
 #define CRL_APB_TIMESTAMP_REF_CTRL	(CRL_APB_BASE + 0x128)
+#define CRL_APB_BOOT_MODE_USER		(CRL_APB_BASE + 0x200)
 #define CRL_APB_RESET_CTRL		(CRL_APB_BASE + 0x218)
 
 #define CRL_APB_TIMESTAMP_REF_CTRL_CLKACT_BIT	(1 << 24)
@@ -71,6 +72,9 @@
 
 #define CRL_APB_RESET_CTRL_SOFT_RESET	(1 << 4)
 
+#define CRL_APB_BOOT_MODE_MASK		(0xf << 0)
+#define ZYNQMP_BOOTMODE_JTAG		0
+
 /* system counter registers and bitfields */
 #define IOU_SCNTRS_BASE			0xFF260000
 #define IOU_SCNTRS_CONTROL		(IOU_SCNTRS_BASE + 0)

plat/xilinx/zynqmp/zynqmp_private.h

@@ -38,5 +38,6 @@ void zynqmp_config_setup(void);
 /* ZynqMP specific functions */
 unsigned int zynqmp_get_uart_clk(void);
 int zynqmp_is_pmu_up(void);
+unsigned int zynqmp_get_bootmode(void);
 
 #endif /* __ZYNQMP_PRIVATE_H__ */