arm: socfpga: reset: Add function to reset add peripherals

Add socfpga_per_reset_all() function to reset all peripherals
but the L4 watchdog. This is needed in the SPL.

Signed-off-by: Marek Vasut <marex@denx.de>

arch/arm/mach-socfpga/include/mach/reset_manager.h

@@ -13,6 +13,7 @@ void reset_deassert_peripherals_handoff(void);
 void socfpga_bridges_reset(int enable);
 
 void socfpga_per_reset(u32 reset, int set);
+void socfpga_per_reset_all(void);
 
 struct socfpga_reset_manager {
 	u32	status;

arch/arm/mach-socfpga/reset_manager.c

@@ -39,6 +39,19 @@ void socfpga_per_reset(u32 reset, int set)
 		clrbits_le32(reg, 1 << RSTMGR_RESET(reset));
 }
 
+/*
+ * Assert reset on every peripheral but L4WD0.
+ * Watchdog must be kept intact to prevent glitches
+ * and/or hangs.
+ */
+void socfpga_per_reset_all(void)
+{
+	const u32 l4wd0 = 1 << RSTMGR_RESET(SOCFPGA_RESET(L4WD0));
+
+	writel(~l4wd0, &reset_manager_base->per_mod_reset);
+	writel(0xffffffff, &reset_manager_base->per2_mod_reset);
+}
+
 /*
  * Write the reset manager register to cause reset
  */