zynq: Add support to find bootmode

Added support to find the bootmodes by reading
slcr bootmode register. this can be helpful to
autoboot the configurations w.r.t a specified bootmode.

Added this functionality on board_late_init as it's not
needed for normal initializtion part.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>

arch/arm/cpu/armv7/zynq/slcr.c

@@ -101,6 +101,12 @@ void zynq_slcr_devcfg_enable(void)
 	zynq_slcr_lock();
 }
 
+u32 zynq_slcr_get_boot_mode(void)
+{
+	/* Get the bootmode register value */
+	return readl(&slcr_base->boot_mode);
+}
+
 u32 zynq_slcr_get_idcode(void)
 {
 	return (readl(&slcr_base->pss_idcode) & SLCR_IDCODE_MASK) >>

arch/arm/include/asm/arch-zynq/sys_proto.h

@@ -13,6 +13,7 @@ extern void zynq_slcr_cpu_reset(void);
 extern void zynq_slcr_gem_clk_setup(u32 gem_id, u32 rclk, u32 clk);
 extern void zynq_slcr_devcfg_disable(void);
 extern void zynq_slcr_devcfg_enable(void);
+extern u32 zynq_slcr_get_boot_mode(void);
 extern u32 zynq_slcr_get_idcode(void);
 extern void zynq_ddrc_init(void);