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https://github.com/AsahiLinux/u-boot
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338 lines
9.6 KiB
C
338 lines
9.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Keystone: PSC configuration module
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*
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* (C) Copyright 2012-2014
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* Texas Instruments Incorporated, <www.ti.com>
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*/
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <asm/io.h>
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#include <asm/processor.h>
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#include <asm/arch/psc_defs.h>
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/**
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* psc_delay() - delay for psc
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*
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* Return: 10
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*/
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int psc_delay(void)
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{
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udelay(10);
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return 10;
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}
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/**
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* psc_wait() - Wait for end of transitional state
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* @domain_num: GPSC domain number
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*
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* Polls pstat for the selected domain and waits for transitions to be complete.
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* Since this is boot loader code it is *ASSUMED* that interrupts are disabled
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* and no other core is mucking around with the psc at the same time.
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*
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* Return: 0 when the domain is free. Returns -1 if a timeout occurred waiting
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* for the completion.
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*/
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int psc_wait(u32 domain_num)
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{
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u32 retry;
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u32 ptstat;
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/*
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* Do nothing if the power domain is in transition. This should never
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* happen since the boot code is the only software accesses psc.
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* It's still remotely possible that the hardware state machines
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* initiate transitions.
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* Don't trap if the domain (or a module in this domain) is
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* stuck in transition.
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*/
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retry = 0;
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do {
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ptstat = __raw_readl(KS2_PSC_BASE + PSC_REG_PSTAT);
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ptstat = ptstat & (1 << domain_num);
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} while ((ptstat != 0) && ((retry += psc_delay()) <
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PSC_PTSTAT_TIMEOUT_LIMIT));
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if (retry >= PSC_PTSTAT_TIMEOUT_LIMIT)
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return -1;
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return 0;
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}
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/**
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* psc_get_domain_num() - Get the domain number
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* @mod_num: LPSC module number
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*/
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u32 psc_get_domain_num(u32 mod_num)
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{
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u32 domain_num;
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/* Get the power domain associated with the module number */
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domain_num = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCFG(mod_num));
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domain_num = PSC_REG_MDCFG_GET_PD(domain_num);
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return domain_num;
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}
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/**
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* psc_set_state() - powers up/down a module
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* @mod_num: LPSC module number
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* @state: 1 to enable, 0 to disable.
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*
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* Powers up/down the requested module and the associated power domain if
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* required. No action is taken it the module is already powered up/down.
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* This only controls modules. The domain in which the module resides will
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* be left in the power on state. Multiple modules can exist in a power
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* domain, so powering down the domain based on a single module is not done.
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*
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* Return: 0 on success, -1 if the module can't be powered up, or if there is a
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* timeout waiting for the transition.
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*/
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int psc_set_state(u32 mod_num, u32 state)
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{
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u32 domain_num;
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u32 pdctl;
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u32 mdctl;
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u32 ptcmd;
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u32 reset_iso;
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u32 v;
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/*
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* Get the power domain associated with the module number, and reset
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* isolation functionality
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*/
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v = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCFG(mod_num));
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domain_num = PSC_REG_MDCFG_GET_PD(v);
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reset_iso = PSC_REG_MDCFG_GET_RESET_ISO(v);
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/* Wait for the status of the domain/module to be non-transitional */
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if (psc_wait(domain_num) != 0)
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return -1;
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/*
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* Perform configuration even if the current status matches the
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* existing state
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*
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* Set the next state of the power domain to on. It's OK if the domain
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* is always on. This code will not ever power down a domain, so no
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* change is made if the new state is power down.
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*/
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if (state == PSC_REG_VAL_MDCTL_NEXT_ON) {
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pdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_PDCTL(domain_num));
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pdctl = PSC_REG_PDCTL_SET_NEXT(pdctl,
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PSC_REG_VAL_PDCTL_NEXT_ON);
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__raw_writel(pdctl, KS2_PSC_BASE + PSC_REG_PDCTL(domain_num));
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}
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/* Set the next state for the module to enabled/disabled */
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mdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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mdctl = PSC_REG_MDCTL_SET_NEXT(mdctl, state);
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mdctl = PSC_REG_MDCTL_SET_RESET_ISO(mdctl, reset_iso);
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__raw_writel(mdctl, KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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/* Trigger the enable */
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ptcmd = __raw_readl(KS2_PSC_BASE + PSC_REG_PTCMD);
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ptcmd |= (u32)(1<<domain_num);
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__raw_writel(ptcmd, KS2_PSC_BASE + PSC_REG_PTCMD);
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/* Wait on the complete */
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return psc_wait(domain_num);
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}
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/**
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* psc_enable_module() - power up a module
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* @mod_num: LPSC module number
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*
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* Powers up the requested module and the associated power domain
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* if required. No action is taken it the module is already powered up.
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*
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* Return: 0 on success, -1 if the module can't be powered up, or
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* if there is a timeout waiting for the transition.
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*
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*/
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int psc_enable_module(u32 mod_num)
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{
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u32 mdctl;
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/* Set the bit to apply reset */
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mdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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if ((mdctl & 0x3f) == PSC_REG_VAL_MDSTAT_STATE_ON)
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return 0;
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return psc_set_state(mod_num, PSC_REG_VAL_MDCTL_NEXT_ON);
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}
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/**
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* psc_disable_module() - Power down a module
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* @mod_num: LPSC module number
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*
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* Return: 0 on success, -1 on failure or timeout.
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*/
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int psc_disable_module(u32 mod_num)
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{
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u32 mdctl;
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/* Set the bit to apply reset */
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mdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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if ((mdctl & 0x3f) == 0)
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return 0;
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mdctl = PSC_REG_MDCTL_SET_LRSTZ(mdctl, 0);
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__raw_writel(mdctl, KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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return psc_set_state(mod_num, PSC_REG_VAL_MDCTL_NEXT_SWRSTDISABLE);
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}
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/**
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* psc_set_reset_iso() - Set the reset isolation bit in mdctl
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* @mod_num: LPSC module number
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*
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* The reset isolation enable bit is set. The state of the module is not
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* changed.
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*
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* Return: 0 if the module config showed that reset isolation is supported.
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* Returns 1 otherwise. This is not an error, but setting the bit in mdctl
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* has no effect.
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*/
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int psc_set_reset_iso(u32 mod_num)
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{
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u32 v;
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u32 mdctl;
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/* Set the reset isolation bit */
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mdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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mdctl = PSC_REG_MDCTL_SET_RESET_ISO(mdctl, 1);
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__raw_writel(mdctl, KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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v = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCFG(mod_num));
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if (PSC_REG_MDCFG_GET_RESET_ISO(v) == 1)
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return 0;
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return 1;
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}
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/**
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* psc_disable_domain() - Disable a power domain
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* @domain_num: GPSC domain number
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*/
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int psc_disable_domain(u32 domain_num)
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{
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u32 pdctl;
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u32 ptcmd;
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pdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_PDCTL(domain_num));
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pdctl = PSC_REG_PDCTL_SET_NEXT(pdctl, PSC_REG_VAL_PDCTL_NEXT_OFF);
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pdctl = PSC_REG_PDCTL_SET_PDMODE(pdctl, PSC_REG_VAL_PDCTL_PDMODE_SLEEP);
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__raw_writel(pdctl, KS2_PSC_BASE + PSC_REG_PDCTL(domain_num));
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ptcmd = __raw_readl(KS2_PSC_BASE + PSC_REG_PTCMD);
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ptcmd |= (u32)(1 << domain_num);
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__raw_writel(ptcmd, KS2_PSC_BASE + PSC_REG_PTCMD);
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return psc_wait(domain_num);
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}
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/**
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* psc_module_keep_in_reset_enabled() - Keep module in enabled,in-reset state
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* @mod_num: LPSC module number
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* @gate_clocks: Can the clocks be gated on this module?
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*
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* Enable the module, but do not release the module from local reset. This is
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* necessary for many processor systems on keystone SoCs to allow for system
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* initialization from a master processor prior to releasing the processor
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* from reset.
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*/
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int psc_module_keep_in_reset_enabled(u32 mod_num, bool gate_clocks)
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{
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u32 mdctl, ptcmd, mdstat;
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u32 next_state;
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int domain_num = psc_get_domain_num(mod_num);
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int timeout = 100000;
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/* Wait for any previous transitions to complete */
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psc_wait(domain_num);
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mdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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/* Should be set 0 to assert Local reset */
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if ((mdctl & PSC_REG_MDCTL_SET_LRSTZ(mdctl, 1))) {
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mdctl = PSC_REG_MDCTL_SET_LRSTZ(mdctl, 0);
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__raw_writel(mdctl, KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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/* Wait for transition to take place */
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psc_wait(domain_num);
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}
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/* Clear Module reset */
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mdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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next_state = gate_clocks ? PSC_REG_VAL_MDCTL_NEXT_OFF :
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PSC_REG_VAL_MDCTL_NEXT_ON;
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mdctl = PSC_REG_MDCTL_SET_NEXT(mdctl, next_state);
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__raw_writel(mdctl, KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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/* Trigger PD transition */
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ptcmd = __raw_readl(KS2_PSC_BASE + PSC_REG_PTCMD);
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ptcmd |= (u32)(1 << domain_num);
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__raw_writel(ptcmd, KS2_PSC_BASE + PSC_REG_PTCMD);
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psc_wait(domain_num);
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mdstat = __raw_readl(KS2_PSC_BASE + PSC_REG_MDSTAT(mod_num));
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while (timeout) {
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mdstat = __raw_readl(KS2_PSC_BASE + PSC_REG_MDSTAT(mod_num));
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if (!(PSC_REG_MDSTAT_GET_STATUS(mdstat) & 0x30) &&
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PSC_REG_MDSTAT_GET_MRSTDONE(mdstat) &&
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PSC_REG_MDSTAT_GET_LRSTDONE(mdstat))
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break;
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timeout--;
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}
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if (!timeout) {
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printf("%s: Timedout waiting for mdstat(0x%08x) to change\n",
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__func__, mdstat);
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return -ETIMEDOUT;
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}
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return 0;
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}
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/**
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* psc_module_release_from_reset() - Release the module from reset
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* @mod_num: LPSC module number
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*
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* This is the follow through for the command 'psc_module_keep_in_reset_enabled'
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* Allowing the module to be released from reset once all required inits are
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* complete for the module. Typically, this allows the processor module to start
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* execution.
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*/
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int psc_module_release_from_reset(u32 mod_num)
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{
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u32 mdctl, mdstat;
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int domain_num = psc_get_domain_num(mod_num);
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int timeout = 100000;
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/* Wait for any previous transitions to complete */
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psc_wait(domain_num);
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mdctl = __raw_readl(KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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/* Should be set to 1 to de-assert Local reset */
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if ((mdctl & PSC_REG_MDCTL_SET_LRSTZ(mdctl, 0))) {
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mdctl = PSC_REG_MDCTL_SET_LRSTZ(mdctl, 1);
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__raw_writel(mdctl, KS2_PSC_BASE + PSC_REG_MDCTL(mod_num));
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/* Wait for transition to take place */
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psc_wait(domain_num);
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}
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mdstat = __raw_readl(KS2_PSC_BASE + PSC_REG_MDSTAT(mod_num));
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while (timeout) {
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mdstat = __raw_readl(KS2_PSC_BASE + PSC_REG_MDSTAT(mod_num));
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if (!(PSC_REG_MDSTAT_GET_STATUS(mdstat) & 0x30) &&
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PSC_REG_MDSTAT_GET_MRSTDONE(mdstat) &&
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PSC_REG_MDSTAT_GET_LRSTDONE(mdstat))
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break;
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timeout--;
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}
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if (!timeout) {
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printf("%s: Timedout waiting for mdstat(0x%08x) to change\n",
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__func__, mdstat);
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return -ETIMEDOUT;
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}
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return 0;
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}
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