From 4c54419737ffbfadd605263d97a1357bb03c04e8 Mon Sep 17 00:00:00 2001 From: Chin Liang See Date: Mon, 2 Dec 2013 12:01:39 -0600 Subject: 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 Cc: Wolfgang Denk CC: Pavel Machek Cc: Dinh Nguyen Cc: Tom Rini Cc: Albert Aribaud --- arch/arm/cpu/armv7/socfpga/freeze_controller.c | 215 +++++++++++++++++++++++++ 1 file changed, 215 insertions(+) create mode 100644 arch/arm/cpu/armv7/socfpga/freeze_controller.c (limited to 'arch/arm/cpu/armv7/socfpga/freeze_controller.c') 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 + * + * SPDX-License-Identifier: GPL-2.0+ + */ + + +#include +#include +#include +#include +#include + +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; +} -- cgit v1.1