// SPDX-License-Identifier: GPL-2.0-only
/*
* OMAP4 PRM instance functions
*
* Copyright ( C ) 2009 Nokia Corporation
* Copyright ( C ) 2011 Texas Instruments , Inc .
* Paul Walmsley
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/io.h>
#include "iomap.h"
#include "common.h"
#include "prcm-common.h"
#include "prm44xx.h"
#include "prm54xx.h"
#include "prm7xx.h"
#include "prminst44xx.h"
#include "prm-regbits-44xx.h"
#include "prcm44xx.h"
#include "prcm43xx.h"
#include "prcm_mpu44xx.h"
#include "soc.h"
static struct omap_domain_base _prm_bases[OMAP4_MAX_PRCM_PARTITIONS];
static s32 prm_dev_inst = PRM_INSTANCE_UNKNOWN;
/**
* omap_prm_base_init - Populates the prm partitions
*
* Populates the base addresses of the _ prm_bases
* array used for read / write of prm module registers .
*/
void omap_prm_base_init(void )
{
memcpy(&_prm_bases[OMAP4430_PRM_PARTITION], &prm_base,
sizeof (prm_base));
memcpy(&_prm_bases[OMAP4430_PRCM_MPU_PARTITION], &prcm_mpu_base,
sizeof (prcm_mpu_base));
}
s32 omap4_prmst_get_prm_dev_inst(void )
{
return prm_dev_inst;
}
void omap4_prminst_set_prm_dev_inst(s32 dev_inst)
{
prm_dev_inst = dev_inst;
}
/* Read a register in a PRM instance */
u32 omap4_prminst_read_inst_reg(u8 part, s16 inst, u16 idx)
{
BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
part == OMAP4430_INVALID_PRCM_PARTITION ||
!_prm_bases[part].va);
return readl_relaxed(_prm_bases[part].va + inst + idx);
}
/* Write into a register in a PRM instance */
void omap4_prminst_write_inst_reg(u32 val, u8 part, s16 inst, u16 idx)
{
BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
part == OMAP4430_INVALID_PRCM_PARTITION ||
!_prm_bases[part].va);
writel_relaxed(val, _prm_bases[part].va + inst + idx);
}
/* Read-modify-write a register in PRM. Caller must lock */
u32 omap4_prminst_rmw_inst_reg_bits(u32 mask, u32 bits, u8 part, s16 inst,
u16 idx)
{
u32 v;
v = omap4_prminst_read_inst_reg(part, inst, idx);
v &= ~mask;
v |= bits;
omap4_prminst_write_inst_reg(v, part, inst, idx);
return v;
}
/**
* omap4_prminst_is_hardreset_asserted - read the HW reset line state of
* submodules contained in the hwmod module
* @ rstctrl_reg : RM_RSTCTRL register address for this module
* @ shift : register bit shift corresponding to the reset line to check
*
* Returns 1 if the ( sub ) module hardreset line is currently asserted ,
* 0 if the ( sub ) module hardreset line is not currently asserted , or
* - EINVAL upon parameter error .
*/
int omap4_prminst_is_hardreset_asserted(u8 shift, u8 part, s16 inst,
u16 rstctrl_offs)
{
u32 v;
v = omap4_prminst_read_inst_reg(part, inst, rstctrl_offs);
v &= 1 << shift;
v >>= shift;
return v;
}
/**
* omap4_prminst_assert_hardreset - assert the HW reset line of a submodule
* @ rstctrl_reg : RM_RSTCTRL register address for this module
* @ shift : register bit shift corresponding to the reset line to assert
*
* Some IPs like dsp , ipu or iva contain processors that require an HW
* reset line to be asserted / deasserted in order to fully enable the
* IP . These modules may have multiple hard - reset lines that reset
* different ' submodules ' inside the IP block . This function will
* place the submodule into reset . Returns 0 upon success or - EINVAL
* upon an argument error .
*/
int omap4_prminst_assert_hardreset(u8 shift, u8 part, s16 inst,
u16 rstctrl_offs)
{
u32 mask = 1 << shift;
omap4_prminst_rmw_inst_reg_bits(mask, mask, part, inst, rstctrl_offs);
return 0 ;
}
/**
* omap4_prminst_deassert_hardreset - deassert a submodule hardreset line and
* wait
* @ shift : register bit shift corresponding to the reset line to deassert
* @ st_shift : status bit offset corresponding to the reset line
* @ part : PRM partition
* @ inst : PRM instance offset
* @ rstctrl_offs : reset register offset
* @ rstst_offs : reset status register offset
*
* Some IPs like dsp , ipu or iva contain processors that require an HW
* reset line to be asserted / deasserted in order to fully enable the
* IP . These modules may have multiple hard - reset lines that reset
* different ' submodules ' inside the IP block . This function will
* take the submodule out of reset and wait until the PRCM indicates
* that the reset has completed before returning . Returns 0 upon success or
* - EINVAL upon an argument error , - EEXIST if the submodule was already out
* of reset , or - EBUSY if the submodule did not exit reset promptly .
*/
int omap4_prminst_deassert_hardreset(u8 shift, u8 st_shift, u8 part, s16 inst,
u16 rstctrl_offs, u16 rstst_offs)
{
int c;
u32 mask = 1 << shift;
u32 st_mask = 1 << st_shift;
/* Check the current status to avoid de-asserting the line twice */
if (omap4_prminst_is_hardreset_asserted(shift, part, inst,
rstctrl_offs) == 0 )
return -EEXIST;
/* Clear the reset status by writing 1 to the status bit */
omap4_prminst_rmw_inst_reg_bits(0 xffffffff, st_mask, part, inst,
rstst_offs);
/* de-assert the reset control line */
omap4_prminst_rmw_inst_reg_bits(mask, 0 , part, inst, rstctrl_offs);
/* wait the status to be set */
omap_test_timeout(omap4_prminst_is_hardreset_asserted(st_shift, part,
inst, rstst_offs),
MAX_MODULE_HARDRESET_WAIT, c);
return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0 ;
}
void omap4_prminst_global_warm_sw_reset(void )
{
u32 v;
s32 inst = omap4_prmst_get_prm_dev_inst();
if (inst == PRM_INSTANCE_UNKNOWN)
return ;
v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, inst,
OMAP4_PRM_RSTCTRL_OFFSET);
v |= OMAP4430_RST_GLOBAL_WARM_SW_MASK;
omap4_prminst_write_inst_reg(v, OMAP4430_PRM_PARTITION,
inst, OMAP4_PRM_RSTCTRL_OFFSET);
/* OCP barrier */
v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
inst, OMAP4_PRM_RSTCTRL_OFFSET);
}
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