socfpga: Adding Freeze Controller driver

Adding Freeze Controller driver. All HPS IOs need to be
in freeze state during pin mux or IO buffer configuration.
It is to avoid any glitch which might happen
during the configuration from propagating to external devices.

Signed-off-by: Chin Liang See <clsee@altera.com>
Cc: Wolfgang Denk <wd@denx.de>
CC: Pavel Machek <pavel@denx.de>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Tom Rini <trini@ti.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/socfpga/spl.c b/arch/arm/cpu/armv7/socfpga/spl.c
index 74bceab183..36a00c39b7 100644
--- a/arch/arm/cpu/armv7/socfpga/spl.c
+++ b/arch/arm/cpu/armv7/socfpga/spl.c
@@ -13,6 +13,7 @@
 #include <asm/arch/reset_manager.h>
 #include <spl.h>
 #include <asm/arch/system_manager.h>
+#include <asm/arch/freeze_controller.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -27,6 +28,10 @@ u32 spl_boot_device(void)
 void spl_board_init(void)
 {
 #ifndef CONFIG_SOCFPGA_VIRTUAL_TARGET
+	debug("Freezing all I/O banks\n");
+	/* freeze all IO banks */
+	sys_mgr_frzctrl_freeze_req();
+
 	/* configure the pin muxing through system manager */
 	sysmgr_pinmux_init();
 #endif /* CONFIG_SOCFPGA_VIRTUAL_TARGET */
@@ -34,6 +39,10 @@ void spl_board_init(void)
 	/* de-assert reset for peripherals and bridges based on handoff */
 	reset_deassert_peripherals_handoff();
 
+	debug("Unfreezing/Thaw all I/O banks\n");
+	/* unfreeze / thaw all IO banks */
+	sys_mgr_frzctrl_thaw_req();
+
 	/* enable console uart printing */
 	preloader_console_init();
 }