/* * 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); }