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>

3 files changed, 225 insertions, 1 deletions

diff --git a/arch/arm/cpu/armv7/socfpga/Makefile b/arch/arm/cpu/armv7/socfpga/Makefile
index dac2bbd..3e84a0c 100644
--- a/arch/arm/cpu/armv7/socfpga/Makefile
+++ b/arch/arm/cpu/armv7/socfpga/Makefile
@@ -9,4 +9,4 @@
 
 obj-y	:= lowlevel_init.o
 obj-y	+= misc.o timer.o reset_manager.o system_manager.o
-obj-$(CONFIG_SPL_BUILD) += spl.o
+obj-$(CONFIG_SPL_BUILD) += spl.o freeze_controller.o
diff --git a/arch/arm/cpu/armv7/socfpga/freeze_controller.c b/arch/arm/cpu/armv7/socfpga/freeze_controller.c
new file mode 100644
index 0000000..b8c9bce
--- /dev/null
+++ b/arch/arm/cpu/armv7/socfpga/freeze_controller.c
@@ -0,0 +1,215 @@
+/*
+ *  Copyright (C) 2013 Altera Corporation <www.altera.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/freeze_controller.h>
+#include <asm/arch/timer.h>
+#include <asm/errno.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct socfpga_freeze_controller *freeze_controller_base =
+		(void *)(SOCFPGA_SYSMGR_ADDRESS + SYSMGR_FRZCTRL_ADDRESS);
+
+/*
+ * Default state from cold reset is FREEZE_ALL; the global
+ * flag is set to TRUE to indicate the IO banks are frozen
+ */
+static uint32_t frzctrl_channel_freeze[FREEZE_CHANNEL_NUM]
+	= { FREEZE_CTRL_FROZEN, FREEZE_CTRL_FROZEN,
+	FREEZE_CTRL_FROZEN, FREEZE_CTRL_FROZEN};
+
+/* Freeze HPS IOs */
+void sys_mgr_frzctrl_freeze_req(void)
+{
+	u32 ioctrl_reg_offset;
+	u32 reg_value;
+	u32 reg_cfg_mask;
+	u32 channel_id;
+
+	/* select software FSM */
+	writel(SYSMGR_FRZCTRL_SRC_VIO1_ENUM_SW,	&freeze_controller_base->src);
+
+	/* Freeze channel 0 to 2 */
+	for (channel_id = 0; channel_id <= 2; channel_id++) {
+		ioctrl_reg_offset = (u32)(
+			&freeze_controller_base->vioctrl +
+			(channel_id << SYSMGR_FRZCTRL_VIOCTRL_SHIFT));
+
+		/*
+		 * Assert active low enrnsl, plniotri
+		 * and niotri signals
+		 */
+		reg_cfg_mask =
+			SYSMGR_FRZCTRL_VIOCTRL_SLEW_MASK
+			| SYSMGR_FRZCTRL_VIOCTRL_WKPULLUP_MASK
+			| SYSMGR_FRZCTRL_VIOCTRL_TRISTATE_MASK;
+		clrbits_le32(ioctrl_reg_offset,	reg_cfg_mask);
+
+		/*
+		 * Note: Delay for 20ns at min
+		 * Assert active low bhniotri signal and de-assert
+		 * active high csrdone
+		 */
+		reg_cfg_mask
+			= SYSMGR_FRZCTRL_VIOCTRL_BUSHOLD_MASK
+			| SYSMGR_FRZCTRL_VIOCTRL_CFG_MASK;
+		clrbits_le32(ioctrl_reg_offset,	reg_cfg_mask);
+
+		/* Set global flag to indicate channel is frozen */
+		frzctrl_channel_freeze[channel_id] = FREEZE_CTRL_FROZEN;
+	}
+
+	/* Freeze channel 3 */
+	/*
+	 * Assert active low enrnsl, plniotri and
+	 * niotri signals
+	 */
+	reg_cfg_mask
+		= SYSMGR_FRZCTRL_HIOCTRL_SLEW_MASK
+		| SYSMGR_FRZCTRL_HIOCTRL_WKPULLUP_MASK
+		| SYSMGR_FRZCTRL_HIOCTRL_TRISTATE_MASK;
+	clrbits_le32(&freeze_controller_base->hioctrl, reg_cfg_mask);
+
+	/*
+	 * assert active low bhniotri & nfrzdrv signals,
+	 * de-assert active high csrdone and assert
+	 * active high frzreg and nfrzdrv signals
+	 */
+	reg_value = readl(&freeze_controller_base->hioctrl);
+	reg_cfg_mask
+		= SYSMGR_FRZCTRL_HIOCTRL_BUSHOLD_MASK
+		| SYSMGR_FRZCTRL_HIOCTRL_CFG_MASK;
+	reg_value
+		= (reg_value & ~reg_cfg_mask)
+		| SYSMGR_FRZCTRL_HIOCTRL_REGRST_MASK
+		| SYSMGR_FRZCTRL_HIOCTRL_OCTRST_MASK;
+	writel(reg_value, &freeze_controller_base->hioctrl);
+
+	/*
+	 * assert active high reinit signal and de-assert
+	 * active high pllbiasen signals
+	 */
+	reg_value = readl(&freeze_controller_base->hioctrl);
+	reg_value
+		= (reg_value &
+		~SYSMGR_FRZCTRL_HIOCTRL_OCT_CFGEN_CALSTART_MASK)
+		| SYSMGR_FRZCTRL_HIOCTRL_DLLRST_MASK;
+	writel(reg_value, &freeze_controller_base->hioctrl);
+
+	/* Set global flag to indicate channel is frozen */
+	frzctrl_channel_freeze[channel_id] = FREEZE_CTRL_FROZEN;
+}
+
+/* Unfreeze/Thaw HPS IOs */
+void sys_mgr_frzctrl_thaw_req(void)
+{
+	u32 ioctrl_reg_offset;
+	u32 reg_cfg_mask;
+	u32 reg_value;
+	u32 channel_id;
+
+	/* select software FSM */
+	writel(SYSMGR_FRZCTRL_SRC_VIO1_ENUM_SW,	&freeze_controller_base->src);
+
+	/* Thaw channel 0 to 2 */
+	for (channel_id = 0; channel_id <= 2; channel_id++) {
+		ioctrl_reg_offset
+			= (u32)(&freeze_controller_base->vioctrl
+				+ (channel_id << SYSMGR_FRZCTRL_VIOCTRL_SHIFT));
+
+		/*
+		 * Assert active low bhniotri signal and
+		 * de-assert active high csrdone
+		 */
+		reg_cfg_mask
+			= SYSMGR_FRZCTRL_VIOCTRL_BUSHOLD_MASK
+			| SYSMGR_FRZCTRL_VIOCTRL_CFG_MASK;
+		setbits_le32(ioctrl_reg_offset,	reg_cfg_mask);
+
+		/*
+		 * Note: Delay for 20ns at min
+		 * de-assert active low plniotri and niotri signals
+		 */
+		reg_cfg_mask
+			= SYSMGR_FRZCTRL_VIOCTRL_WKPULLUP_MASK
+			| SYSMGR_FRZCTRL_VIOCTRL_TRISTATE_MASK;
+		setbits_le32(ioctrl_reg_offset,	reg_cfg_mask);
+
+		/*
+		 * Note: Delay for 20ns at min
+		 * de-assert active low enrnsl signal
+		 */
+		setbits_le32(ioctrl_reg_offset,
+			SYSMGR_FRZCTRL_VIOCTRL_SLEW_MASK);
+
+		/* Set global flag to indicate channel is thawed */
+		frzctrl_channel_freeze[channel_id] = FREEZE_CTRL_THAWED;
+	}
+
+	/* Thaw channel 3 */
+	/* de-assert active high reinit signal */
+	clrbits_le32(&freeze_controller_base->hioctrl,
+		SYSMGR_FRZCTRL_HIOCTRL_DLLRST_MASK);
+
+	/*
+	 * Note: Delay for 40ns at min
+	 * assert active high pllbiasen signals
+	 */
+	setbits_le32(&freeze_controller_base->hioctrl,
+		SYSMGR_FRZCTRL_HIOCTRL_OCT_CFGEN_CALSTART_MASK);
+
+	/*
+	 * Delay 1000 intosc. intosc is based on eosc1
+	 * Use worst case which is fatest eosc1=50MHz, delay required
+	 * is 1/50MHz * 1000 = 20us
+	 */
+	udelay(20);
+
+	/*
+	 * de-assert active low bhniotri signals,
+	 * assert active high csrdone and nfrzdrv signal
+	 */
+	reg_value = readl(&freeze_controller_base->hioctrl);
+	reg_value = (reg_value
+		| SYSMGR_FRZCTRL_HIOCTRL_BUSHOLD_MASK
+		| SYSMGR_FRZCTRL_HIOCTRL_CFG_MASK)
+		& ~SYSMGR_FRZCTRL_HIOCTRL_OCTRST_MASK;
+	writel(reg_value, &freeze_controller_base->hioctrl);
+
+	/*
+	 * Delay 33 intosc
+	 * Use worst case which is fatest eosc1=50MHz, delay required
+	 * is 1/50MHz * 33 = 660ns ~= 1us
+	 */
+	udelay(1);
+
+	/* de-assert active low plniotri and niotri signals */
+	reg_cfg_mask
+		= SYSMGR_FRZCTRL_HIOCTRL_WKPULLUP_MASK
+		| SYSMGR_FRZCTRL_HIOCTRL_TRISTATE_MASK;
+
+	setbits_le32(&freeze_controller_base->hioctrl, reg_cfg_mask);
+
+	/*
+	 * Note: Delay for 40ns at min
+	 * de-assert active high frzreg signal
+	 */
+	clrbits_le32(&freeze_controller_base->hioctrl,
+		SYSMGR_FRZCTRL_HIOCTRL_REGRST_MASK);
+
+	/*
+	 * Note: Delay for 40ns at min
+	 * de-assert active low enrnsl signal
+	 */
+	setbits_le32(&freeze_controller_base->hioctrl,
+		SYSMGR_FRZCTRL_HIOCTRL_SLEW_MASK);
+
+	/* Set global flag to indicate channel is thawed */
+	frzctrl_channel_freeze[channel_id] = FREEZE_CTRL_THAWED;
+}
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 @@ 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();
 }