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>
diff --git a/arch/arm/cpu/armv7/socfpga/spl.c b/arch/arm/cpu/armv7/socfpga/spl.c
index 74bceab..36a00c3 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 @@
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 @@
/* 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();
}