forked from luck/tmp_suning_uos_patched
181 lines
4.5 KiB
C
181 lines
4.5 KiB
C
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/*
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* Versatile Express Serial Power Controller (SPC) support
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*
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* Copyright (C) 2013 ARM Ltd.
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*
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* Authors: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
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* Achin Gupta <achin.gupta@arm.com>
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* Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <asm/cacheflush.h>
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#define SPCLOG "vexpress-spc: "
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/* SPC wake-up IRQs status and mask */
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#define WAKE_INT_MASK 0x24
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#define WAKE_INT_RAW 0x28
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#define WAKE_INT_STAT 0x2c
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/* SPC power down registers */
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#define A15_PWRDN_EN 0x30
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#define A7_PWRDN_EN 0x34
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/* SPC per-CPU mailboxes */
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#define A15_BX_ADDR0 0x68
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#define A7_BX_ADDR0 0x78
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/* wake-up interrupt masks */
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#define GBL_WAKEUP_INT_MSK (0x3 << 10)
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/* TC2 static dual-cluster configuration */
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#define MAX_CLUSTERS 2
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struct ve_spc_drvdata {
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void __iomem *baseaddr;
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/*
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* A15s cluster identifier
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* It corresponds to A15 processors MPIDR[15:8] bitfield
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*/
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u32 a15_clusid;
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};
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static struct ve_spc_drvdata *info;
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static inline bool cluster_is_a15(u32 cluster)
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{
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return cluster == info->a15_clusid;
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}
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/**
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* ve_spc_global_wakeup_irq()
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*
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* Function to set/clear global wakeup IRQs. Not protected by locking since
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* it might be used in code paths where normal cacheable locks are not
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* working. Locking must be provided by the caller to ensure atomicity.
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*
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* @set: if true, global wake-up IRQs are set, if false they are cleared
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*/
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void ve_spc_global_wakeup_irq(bool set)
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{
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u32 reg;
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reg = readl_relaxed(info->baseaddr + WAKE_INT_MASK);
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if (set)
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reg |= GBL_WAKEUP_INT_MSK;
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else
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reg &= ~GBL_WAKEUP_INT_MSK;
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writel_relaxed(reg, info->baseaddr + WAKE_INT_MASK);
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}
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/**
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* ve_spc_cpu_wakeup_irq()
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*
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* Function to set/clear per-CPU wake-up IRQs. Not protected by locking since
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* it might be used in code paths where normal cacheable locks are not
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* working. Locking must be provided by the caller to ensure atomicity.
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*
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* @cluster: mpidr[15:8] bitfield describing cluster affinity level
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* @cpu: mpidr[7:0] bitfield describing cpu affinity level
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* @set: if true, wake-up IRQs are set, if false they are cleared
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*/
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void ve_spc_cpu_wakeup_irq(u32 cluster, u32 cpu, bool set)
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{
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u32 mask, reg;
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if (cluster >= MAX_CLUSTERS)
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return;
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mask = 1 << cpu;
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if (!cluster_is_a15(cluster))
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mask <<= 4;
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reg = readl_relaxed(info->baseaddr + WAKE_INT_MASK);
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if (set)
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reg |= mask;
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else
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reg &= ~mask;
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writel_relaxed(reg, info->baseaddr + WAKE_INT_MASK);
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}
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/**
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* ve_spc_set_resume_addr() - set the jump address used for warm boot
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*
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* @cluster: mpidr[15:8] bitfield describing cluster affinity level
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* @cpu: mpidr[7:0] bitfield describing cpu affinity level
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* @addr: physical resume address
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*/
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void ve_spc_set_resume_addr(u32 cluster, u32 cpu, u32 addr)
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{
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void __iomem *baseaddr;
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if (cluster >= MAX_CLUSTERS)
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return;
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if (cluster_is_a15(cluster))
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baseaddr = info->baseaddr + A15_BX_ADDR0 + (cpu << 2);
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else
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baseaddr = info->baseaddr + A7_BX_ADDR0 + (cpu << 2);
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writel_relaxed(addr, baseaddr);
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}
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/**
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* ve_spc_powerdown()
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*
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* Function to enable/disable cluster powerdown. Not protected by locking
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* since it might be used in code paths where normal cacheable locks are not
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* working. Locking must be provided by the caller to ensure atomicity.
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*
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* @cluster: mpidr[15:8] bitfield describing cluster affinity level
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* @enable: if true enables powerdown, if false disables it
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*/
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void ve_spc_powerdown(u32 cluster, bool enable)
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{
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u32 pwdrn_reg;
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if (cluster >= MAX_CLUSTERS)
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return;
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pwdrn_reg = cluster_is_a15(cluster) ? A15_PWRDN_EN : A7_PWRDN_EN;
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writel_relaxed(enable, info->baseaddr + pwdrn_reg);
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}
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int __init ve_spc_init(void __iomem *baseaddr, u32 a15_clusid)
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{
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info) {
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pr_err(SPCLOG "unable to allocate mem\n");
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return -ENOMEM;
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}
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info->baseaddr = baseaddr;
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info->a15_clusid = a15_clusid;
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/*
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* Multi-cluster systems may need this data when non-coherent, during
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* cluster power-up/power-down. Make sure driver info reaches main
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* memory.
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*/
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sync_cache_w(info);
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sync_cache_w(&info);
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return 0;
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}
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