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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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02051ead97
Coresight components and debug are using a common lock control mechansim. Writing 0xC5ACCE55 to the Lock Access Register (LAR) in case of a coresight components enables further access to the coresight device registers. Writing any other value to it removes the write access. Writing 0xC5ACCE55 to the OS Lock Access Register (OSLAR) in case of debug locks the debug register for further access to the debug registers. Writing any other value to it unlocks the debug registers. Unfortunately, the existing coresight code uses the terms lock and unlock the other way around. Unlocking stands for enabling write access and locking for removing write access. That is why the definition of the LAR and OSLAR key value has been changed to CS_LAR_KEY. Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
160 lines
3.6 KiB
C
160 lines
3.6 KiB
C
#ifndef __ASMARM_CTI_H
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#define __ASMARM_CTI_H
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#include <asm/io.h>
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#include <asm/hardware/coresight.h>
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/* The registers' definition is from section 3.2 of
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* Embedded Cross Trigger Revision: r0p0
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*/
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#define CTICONTROL 0x000
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#define CTISTATUS 0x004
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#define CTILOCK 0x008
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#define CTIPROTECTION 0x00C
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#define CTIINTACK 0x010
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#define CTIAPPSET 0x014
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#define CTIAPPCLEAR 0x018
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#define CTIAPPPULSE 0x01c
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#define CTIINEN 0x020
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#define CTIOUTEN 0x0A0
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#define CTITRIGINSTATUS 0x130
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#define CTITRIGOUTSTATUS 0x134
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#define CTICHINSTATUS 0x138
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#define CTICHOUTSTATUS 0x13c
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#define CTIPERIPHID0 0xFE0
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#define CTIPERIPHID1 0xFE4
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#define CTIPERIPHID2 0xFE8
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#define CTIPERIPHID3 0xFEC
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#define CTIPCELLID0 0xFF0
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#define CTIPCELLID1 0xFF4
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#define CTIPCELLID2 0xFF8
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#define CTIPCELLID3 0xFFC
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/* The below are from section 3.6.4 of
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* CoreSight v1.0 Architecture Specification
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*/
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#define LOCKACCESS 0xFB0
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#define LOCKSTATUS 0xFB4
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/**
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* struct cti - cross trigger interface struct
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* @base: mapped virtual address for the cti base
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* @irq: irq number for the cti
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* @trig_out_for_irq: triger out number which will cause
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* the @irq happen
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*
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* cti struct used to operate cti registers.
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*/
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struct cti {
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void __iomem *base;
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int irq;
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int trig_out_for_irq;
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};
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/**
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* cti_init - initialize the cti instance
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* @cti: cti instance
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* @base: mapped virtual address for the cti base
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* @irq: irq number for the cti
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* @trig_out: triger out number which will cause
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* the @irq happen
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*
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* called by machine code to pass the board dependent
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* @base, @irq and @trig_out to cti.
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*/
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static inline void cti_init(struct cti *cti,
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void __iomem *base, int irq, int trig_out)
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{
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cti->base = base;
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cti->irq = irq;
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cti->trig_out_for_irq = trig_out;
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}
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/**
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* cti_map_trigger - use the @chan to map @trig_in to @trig_out
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* @cti: cti instance
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* @trig_in: trigger in number
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* @trig_out: trigger out number
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* @channel: channel number
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*
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* This function maps one trigger in of @trig_in to one trigger
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* out of @trig_out using the channel @chan.
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*/
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static inline void cti_map_trigger(struct cti *cti,
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int trig_in, int trig_out, int chan)
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{
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void __iomem *base = cti->base;
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unsigned long val;
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val = __raw_readl(base + CTIINEN + trig_in * 4);
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val |= BIT(chan);
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__raw_writel(val, base + CTIINEN + trig_in * 4);
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val = __raw_readl(base + CTIOUTEN + trig_out * 4);
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val |= BIT(chan);
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__raw_writel(val, base + CTIOUTEN + trig_out * 4);
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}
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/**
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* cti_enable - enable the cti module
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* @cti: cti instance
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*
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* enable the cti module
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*/
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static inline void cti_enable(struct cti *cti)
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{
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__raw_writel(0x1, cti->base + CTICONTROL);
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}
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/**
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* cti_disable - disable the cti module
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* @cti: cti instance
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*
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* enable the cti module
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*/
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static inline void cti_disable(struct cti *cti)
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{
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__raw_writel(0, cti->base + CTICONTROL);
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}
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/**
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* cti_irq_ack - clear the cti irq
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* @cti: cti instance
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*
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* clear the cti irq
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*/
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static inline void cti_irq_ack(struct cti *cti)
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{
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void __iomem *base = cti->base;
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unsigned long val;
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val = __raw_readl(base + CTIINTACK);
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val |= BIT(cti->trig_out_for_irq);
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__raw_writel(val, base + CTIINTACK);
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}
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/**
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* cti_unlock - unlock cti module
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* @cti: cti instance
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*
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* unlock the cti module, or else any writes to the cti
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* module is not allowed.
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*/
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static inline void cti_unlock(struct cti *cti)
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{
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__raw_writel(CS_LAR_KEY, cti->base + LOCKACCESS);
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}
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/**
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* cti_lock - lock cti module
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* @cti: cti instance
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*
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* lock the cti module, so any writes to the cti
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* module will be not allowed.
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*/
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static inline void cti_lock(struct cti *cti)
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{
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__raw_writel(~CS_LAR_KEY, cti->base + LOCKACCESS);
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}
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#endif
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