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/*
* Keystone: PSC configuration module
*
* (C) Copyright 2012-2014
* Texas Instruments Incorporated, <www.ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm-generic/errno.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/arch/psc_defs.h>
int psc_delay(void)
{
udelay(10);
return 10;
}
/*
* FUNCTION PURPOSE: Wait for end of transitional state
*
* DESCRIPTION: Polls pstat for the selected domain and waits for transitions
* to be complete.
*
* Since this is boot loader code it is *ASSUMED* that interrupts
* are disabled and no other core is mucking around with the psc
* at the same time.
*
* Returns 0 when the domain is free. Returns -1 if a timeout
* occurred waiting for the completion.
*/
int psc_wait(u32 domain_num)
{
u32 retry;
u32 ptstat;
/*
* Do nothing if the power domain is in transition. This should never
* happen since the boot code is the only software accesses psc.
* It's still remotely possible that the hardware state machines
* initiate transitions.
* Don't trap if the domain (or a module in this domain) is
* stuck in transition.
*/
retry = 0;
do {
ptstat = __raw_readl(KS2_PSC_BASE + PSC_REG_PSTAT);
ptstat = ptstat & (1 << domain_num);
} while ((ptstat != 0) && ((retry += psc_delay()) <
PSC_PTSTAT_TIMEOUT_LIMIT));
if (retry >= PSC_PTSTAT_TIMEOUT_LIMIT)
return -1;
return 0;
}
u32 psc_get_domain_num(u32 mod_num)
{
u32 domain_num;
/* Get the power domain associated with the module number */
domain_num = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCFG(mod_num));
domain_num = PSC_REG_MDCFG_GET_PD(domain_num);
return domain_num;
}
/*
* FUNCTION PURPOSE: Power up/down a module
*
* DESCRIPTION: Powers up/down the requested module and the associated power
* domain if required. No action is taken it the module is
* already powered up/down.
*
* This only controls modules. The domain in which the module
* resides will be left in the power on state. Multiple modules
* can exist in a power domain, so powering down the domain based
* on a single module is not done.
*
* Returns 0 on success, -1 if the module can't be powered up, or
* if there is a timeout waiting for the transition.
*/
int psc_set_state(u32 mod_num, u32 state)
{
u32 domain_num;
u32 pdctl;
u32 mdctl;
u32 ptcmd;
u32 reset_iso;
u32 v;
/*
* Get the power domain associated with the module number, and reset
* isolation functionality
*/
v = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCFG(mod_num));
domain_num = PSC_REG_MDCFG_GET_PD(v);
reset_iso = PSC_REG_MDCFG_GET_RESET_ISO(v);
/* Wait for the status of the domain/module to be non-transitional */
if (psc_wait(domain_num) != 0)
return -1;
/*
* Perform configuration even if the current status matches the
* existing state
*
* Set the next state of the power domain to on. It's OK if the domain
* is always on. This code will not ever power down a domain, so no
* change is made if the new state is power down.
*/
if (state == PSC_REG_VAL_MDCTL_NEXT_ON) {
pdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_PDCTL(domain_num));
pdctl = PSC_REG_PDCTL_SET_NEXT(pdctl,
PSC_REG_VAL_PDCTL_NEXT_ON);
__raw_writel(pdctl, KS2_PSC_BASE + PSC_REG_PDCTL(domain_num));
}
/* Set the next state for the module to enabled/disabled */
mdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
mdctl = PSC_REG_MDCTL_SET_NEXT(mdctl, state);
mdctl = PSC_REG_MDCTL_SET_RESET_ISO(mdctl, reset_iso);
__raw_writel(mdctl, KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
/* Trigger the enable */
ptcmd = __raw_readl(KS2_PSC_BASE + PSC_REG_PTCMD);
ptcmd |= (u32)(1<<domain_num);
__raw_writel(ptcmd, KS2_PSC_BASE + PSC_REG_PTCMD);
/* Wait on the complete */
return psc_wait(domain_num);
}
/*
* FUNCTION PURPOSE: Power up a module
*
* DESCRIPTION: Powers up the requested module and the associated power domain
* if required. No action is taken it the module is already
* powered up.
*
* Returns 0 on success, -1 if the module can't be powered up, or
* if there is a timeout waiting for the transition.
*/
int psc_enable_module(u32 mod_num)
{
u32 mdctl;
/* Set the bit to apply reset */
mdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
if ((mdctl & 0x3f) == PSC_REG_VAL_MDSTAT_STATE_ON)
return 0;
return psc_set_state(mod_num, PSC_REG_VAL_MDCTL_NEXT_ON);
}
/*
* FUNCTION PURPOSE: Power down a module
*
* DESCRIPTION: Powers down the requested module.
*
* Returns 0 on success, -1 on failure or timeout.
*/
int psc_disable_module(u32 mod_num)
{
u32 mdctl;
/* Set the bit to apply reset */
mdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
if ((mdctl & 0x3f) == 0)
return 0;
mdctl = PSC_REG_MDCTL_SET_LRSTZ(mdctl, 0);
__raw_writel(mdctl, KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
return psc_set_state(mod_num, PSC_REG_VAL_MDCTL_NEXT_SWRSTDISABLE);
}
/*
* FUNCTION PURPOSE: Set the reset isolation bit in mdctl
*
* DESCRIPTION: The reset isolation enable bit is set. The state of the module
* is not changed. Returns 0 if the module config showed that
* reset isolation is supported. Returns 1 otherwise. This is not
* an error, but setting the bit in mdctl has no effect.
*/
int psc_set_reset_iso(u32 mod_num)
{
u32 v;
u32 mdctl;
/* Set the reset isolation bit */
mdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
mdctl = PSC_REG_MDCTL_SET_RESET_ISO(mdctl, 1);
__raw_writel(mdctl, KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
v = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCFG(mod_num));
if (PSC_REG_MDCFG_GET_RESET_ISO(v) == 1)
return 0;
return 1;
}
/*
* FUNCTION PURPOSE: Disable a power domain
*
* DESCRIPTION: The power domain is disabled
*/
int psc_disable_domain(u32 domain_num)
{
u32 pdctl;
u32 ptcmd;
pdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_PDCTL(domain_num));
pdctl = PSC_REG_PDCTL_SET_NEXT(pdctl, PSC_REG_VAL_PDCTL_NEXT_OFF);
pdctl = PSC_REG_PDCTL_SET_PDMODE(pdctl, PSC_REG_VAL_PDCTL_PDMODE_SLEEP);
__raw_writel(pdctl, KS2_PSC_BASE + PSC_REG_PDCTL(domain_num));
ptcmd = __raw_readl(KS2_PSC_BASE + PSC_REG_PTCMD);
ptcmd |= (u32)(1 << domain_num);
__raw_writel(ptcmd, KS2_PSC_BASE + PSC_REG_PTCMD);
return psc_wait(domain_num);
}
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