blob: 566b8d2c092c31de6293f245d81b12a899d40622 [file] [log] [blame]
* Copyright (C) 2013 Imagination Technologies
* Author: Paul Burton <>
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
#include <linux/errno.h>
#include <linux/percpu.h>
#include <linux/spinlock.h>
#include <asm/mips-cm.h>
#include <asm/mips-cpc.h>
void __iomem *mips_cpc_base;
static DEFINE_PER_CPU_ALIGNED(spinlock_t, cpc_core_lock);
static DEFINE_PER_CPU_ALIGNED(unsigned long, cpc_core_lock_flags);
* mips_cpc_phys_base - retrieve the physical base address of the CPC
* This function returns the physical base address of the Cluster Power
* Controller memory mapped registers, or 0 if no Cluster Power Controller
* is present.
static phys_addr_t mips_cpc_phys_base(void)
unsigned long cpc_base;
if (!mips_cm_present())
return 0;
if (!(read_gcr_cpc_status() & CM_GCR_CPC_STATUS_EX_MSK))
return 0;
/* If the CPC is already enabled, leave it so */
cpc_base = read_gcr_cpc_base();
if (cpc_base & CM_GCR_CPC_BASE_CPCEN_MSK)
return cpc_base & CM_GCR_CPC_BASE_CPCBASE_MSK;
/* Otherwise, give it the default address & enable it */
cpc_base = mips_cpc_default_phys_base();
write_gcr_cpc_base(cpc_base | CM_GCR_CPC_BASE_CPCEN_MSK);
return cpc_base;
int mips_cpc_probe(void)
phys_addr_t addr;
unsigned cpu;
spin_lock_init(&per_cpu(cpc_core_lock, cpu));
addr = mips_cpc_phys_base();
if (!addr)
return -ENODEV;
mips_cpc_base = ioremap_nocache(addr, 0x8000);
if (!mips_cpc_base)
return -ENXIO;
return 0;
void mips_cpc_lock_other(unsigned int core)
unsigned curr_core;
curr_core = current_cpu_data.core;
spin_lock_irqsave(&per_cpu(cpc_core_lock, curr_core),
per_cpu(cpc_core_lock_flags, curr_core));
write_cpc_cl_other(core << CPC_Cx_OTHER_CORENUM_SHF);
* Ensure the core-other region reflects the appropriate core &
* VP before any accesses to it occur.
void mips_cpc_unlock_other(void)
unsigned curr_core = current_cpu_data.core;
spin_unlock_irqrestore(&per_cpu(cpc_core_lock, curr_core),
per_cpu(cpc_core_lock_flags, curr_core));