diff options
Diffstat (limited to 'arch/arm/cpu/armv7/keystone/psc.c')
| -rw-r--r-- | arch/arm/cpu/armv7/keystone/psc.c | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/arch/arm/cpu/armv7/keystone/psc.c b/arch/arm/cpu/armv7/keystone/psc.c deleted file mode 100644 index 237e776..0000000 --- a/arch/arm/cpu/armv7/keystone/psc.c +++ /dev/null @@ -1,227 +0,0 @@ -/* - * 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); -} |