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/*
* Copyright (C) 2013 Altera Corporation <www.altera.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/clock_manager.h>
#include <asm/arch/freeze_controller.h>
#include <linux/errno.h>
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);
/*
* 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;
unsigned long eosc1_freq;
/* 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);
/*
* 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 cycles. The intosc is based on eosc1. */
eosc1_freq = cm_get_osc_clk_hz(1) / 1000; /* kHz */
udelay(DIV_ROUND_UP(1000000, eosc1_freq));
/*
* 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;
}
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