![Dave Martin](/assets/img/avatar_default.png)
This patch implements the power_down_finish() method for TC2, to
enable the kernel to confirm when CPUs are safely powered down.
The information required for determining when a CPU is parked
cannot be obtained from any single place, so a few sources of
information must be combined:
* mcpm_cpu_power_down() must be pending for the CPU, so that we
don't get confused by false STANDBYWFI positives arising from
CPUidle. This is detected by waiting for the tc2_pm use count
for the target CPU to reach 0.
* Either the SPC must report that the CPU has asserted
STANDBYWFI, or the TC2 tile's reset control logic must be
holding the CPU in reset.
Just checking for STANDBYWFI is not sufficient, because this
signal is not latched when the the cluster is clamped off and
powered down: the relevant status bits just drop to zero. This
means that STANDBYWFI status cannot be used for reliable
detection of the last CPU in a cluster reaching WFI.
This patch is required in order for kexec to work with MCPM on TC2.
MCPM code was changed in commit 0de0d64675
('ARM: 7848/1: mcpm:
Implement cpu_kill() to synchronise on powerdown'), and since then it
will hit a WARN_ON_ONCE() due to power_down_finish not being implemented
on the TC2 platform.
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Pawel Moll <pawel.moll@arm.com>
Reviewed-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
585 lines
14 KiB
C
585 lines
14 KiB
C
/*
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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/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/cpu.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/pm_opp.h>
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#include <linux/slab.h>
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#include <linux/semaphore.h>
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#include <asm/cacheflush.h>
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#define SPCLOG "vexpress-spc: "
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#define PERF_LVL_A15 0x00
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#define PERF_REQ_A15 0x04
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#define PERF_LVL_A7 0x08
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#define PERF_REQ_A7 0x0c
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#define COMMS 0x10
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#define COMMS_REQ 0x14
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#define PWC_STATUS 0x18
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#define PWC_FLAG 0x1c
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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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/* SPC CPU/cluster reset statue */
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#define STANDBYWFI_STAT 0x3c
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#define STANDBYWFI_STAT_A15_CPU_MASK(cpu) (1 << (cpu))
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#define STANDBYWFI_STAT_A7_CPU_MASK(cpu) (1 << (3 + (cpu)))
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/* SPC system config interface registers */
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#define SYSCFG_WDATA 0x70
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#define SYSCFG_RDATA 0x74
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/* A15/A7 OPP virtual register base */
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#define A15_PERFVAL_BASE 0xC10
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#define A7_PERFVAL_BASE 0xC30
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/* Config interface control bits */
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#define SYSCFG_START (1 << 31)
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#define SYSCFG_SCC (6 << 20)
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#define SYSCFG_STAT (14 << 20)
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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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/*
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* Even though the SPC takes max 3-5 ms to complete any OPP/COMMS
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* operation, the operation could start just before jiffie is about
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* to be incremented. So setting timeout value of 20ms = 2jiffies@100Hz
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*/
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#define TIMEOUT_US 20000
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#define MAX_OPPS 8
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#define CA15_DVFS 0
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#define CA7_DVFS 1
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#define SPC_SYS_CFG 2
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#define STAT_COMPLETE(type) ((1 << 0) << (type << 2))
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#define STAT_ERR(type) ((1 << 1) << (type << 2))
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#define RESPONSE_MASK(type) (STAT_COMPLETE(type) | STAT_ERR(type))
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struct ve_spc_opp {
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unsigned long freq;
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unsigned long u_volt;
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};
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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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uint32_t cur_rsp_mask;
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uint32_t cur_rsp_stat;
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struct semaphore sem;
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struct completion done;
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struct ve_spc_opp *opps[MAX_CLUSTERS];
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int num_opps[MAX_CLUSTERS];
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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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static u32 standbywfi_cpu_mask(u32 cpu, u32 cluster)
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{
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return cluster_is_a15(cluster) ?
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STANDBYWFI_STAT_A15_CPU_MASK(cpu)
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: STANDBYWFI_STAT_A7_CPU_MASK(cpu);
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}
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/**
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* ve_spc_cpu_in_wfi(u32 cpu, u32 cluster)
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*
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* @cpu: mpidr[7:0] bitfield describing CPU affinity level within cluster
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* @cluster: mpidr[15:8] bitfield describing cluster affinity level
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*
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* @return: non-zero if and only if the specified CPU is in WFI
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*
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* Take care when interpreting the result of this function: a CPU might
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* be in WFI temporarily due to idle, and is not necessarily safely
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* parked.
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*/
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int ve_spc_cpu_in_wfi(u32 cpu, u32 cluster)
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{
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int ret;
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u32 mask = standbywfi_cpu_mask(cpu, cluster);
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if (cluster >= MAX_CLUSTERS)
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return 1;
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ret = readl_relaxed(info->baseaddr + STANDBYWFI_STAT);
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pr_debug("%s: PCFGREG[0x%X] = 0x%08X, mask = 0x%X\n",
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__func__, STANDBYWFI_STAT, ret, mask);
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return ret & mask;
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}
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static int ve_spc_get_performance(int cluster, u32 *freq)
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{
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struct ve_spc_opp *opps = info->opps[cluster];
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u32 perf_cfg_reg = 0;
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u32 perf;
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perf_cfg_reg = cluster_is_a15(cluster) ? PERF_LVL_A15 : PERF_LVL_A7;
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perf = readl_relaxed(info->baseaddr + perf_cfg_reg);
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if (perf >= info->num_opps[cluster])
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return -EINVAL;
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opps += perf;
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*freq = opps->freq;
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return 0;
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}
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/* find closest match to given frequency in OPP table */
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static int ve_spc_round_performance(int cluster, u32 freq)
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{
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int idx, max_opp = info->num_opps[cluster];
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struct ve_spc_opp *opps = info->opps[cluster];
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u32 fmin = 0, fmax = ~0, ftmp;
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freq /= 1000; /* OPP entries in kHz */
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for (idx = 0; idx < max_opp; idx++, opps++) {
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ftmp = opps->freq;
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if (ftmp >= freq) {
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if (ftmp <= fmax)
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fmax = ftmp;
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} else {
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if (ftmp >= fmin)
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fmin = ftmp;
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}
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}
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if (fmax != ~0)
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return fmax * 1000;
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else
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return fmin * 1000;
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}
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static int ve_spc_find_performance_index(int cluster, u32 freq)
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{
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int idx, max_opp = info->num_opps[cluster];
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struct ve_spc_opp *opps = info->opps[cluster];
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for (idx = 0; idx < max_opp; idx++, opps++)
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if (opps->freq == freq)
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break;
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return (idx == max_opp) ? -EINVAL : idx;
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}
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static int ve_spc_waitforcompletion(int req_type)
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{
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int ret = wait_for_completion_interruptible_timeout(
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&info->done, usecs_to_jiffies(TIMEOUT_US));
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if (ret == 0)
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ret = -ETIMEDOUT;
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else if (ret > 0)
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ret = info->cur_rsp_stat & STAT_COMPLETE(req_type) ? 0 : -EIO;
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return ret;
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}
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static int ve_spc_set_performance(int cluster, u32 freq)
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{
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u32 perf_cfg_reg, perf_stat_reg;
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int ret, perf, req_type;
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if (cluster_is_a15(cluster)) {
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req_type = CA15_DVFS;
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perf_cfg_reg = PERF_LVL_A15;
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perf_stat_reg = PERF_REQ_A15;
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} else {
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req_type = CA7_DVFS;
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perf_cfg_reg = PERF_LVL_A7;
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perf_stat_reg = PERF_REQ_A7;
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}
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perf = ve_spc_find_performance_index(cluster, freq);
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if (perf < 0)
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return perf;
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if (down_timeout(&info->sem, usecs_to_jiffies(TIMEOUT_US)))
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return -ETIME;
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init_completion(&info->done);
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info->cur_rsp_mask = RESPONSE_MASK(req_type);
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writel(perf, info->baseaddr + perf_cfg_reg);
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ret = ve_spc_waitforcompletion(req_type);
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info->cur_rsp_mask = 0;
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up(&info->sem);
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return ret;
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}
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static int ve_spc_read_sys_cfg(int func, int offset, uint32_t *data)
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{
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int ret;
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if (down_timeout(&info->sem, usecs_to_jiffies(TIMEOUT_US)))
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return -ETIME;
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init_completion(&info->done);
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info->cur_rsp_mask = RESPONSE_MASK(SPC_SYS_CFG);
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/* Set the control value */
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writel(SYSCFG_START | func | offset >> 2, info->baseaddr + COMMS);
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ret = ve_spc_waitforcompletion(SPC_SYS_CFG);
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if (ret == 0)
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*data = readl(info->baseaddr + SYSCFG_RDATA);
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info->cur_rsp_mask = 0;
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up(&info->sem);
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return ret;
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}
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static irqreturn_t ve_spc_irq_handler(int irq, void *data)
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{
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struct ve_spc_drvdata *drv_data = data;
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uint32_t status = readl_relaxed(drv_data->baseaddr + PWC_STATUS);
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if (info->cur_rsp_mask & status) {
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info->cur_rsp_stat = status;
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complete(&drv_data->done);
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}
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return IRQ_HANDLED;
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}
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/*
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* +--------------------------+
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* | 31 20 | 19 0 |
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* +--------------------------+
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* | u_volt | freq(kHz) |
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* +--------------------------+
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*/
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#define MULT_FACTOR 20
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#define VOLT_SHIFT 20
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#define FREQ_MASK (0xFFFFF)
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static int ve_spc_populate_opps(uint32_t cluster)
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{
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uint32_t data = 0, off, ret, idx;
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struct ve_spc_opp *opps;
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opps = kzalloc(sizeof(*opps) * MAX_OPPS, GFP_KERNEL);
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if (!opps)
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return -ENOMEM;
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info->opps[cluster] = opps;
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off = cluster_is_a15(cluster) ? A15_PERFVAL_BASE : A7_PERFVAL_BASE;
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for (idx = 0; idx < MAX_OPPS; idx++, off += 4, opps++) {
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ret = ve_spc_read_sys_cfg(SYSCFG_SCC, off, &data);
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if (!ret) {
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opps->freq = (data & FREQ_MASK) * MULT_FACTOR;
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opps->u_volt = data >> VOLT_SHIFT;
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} else {
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break;
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}
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}
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info->num_opps[cluster] = idx;
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return ret;
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}
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static int ve_init_opp_table(struct device *cpu_dev)
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{
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int cluster = topology_physical_package_id(cpu_dev->id);
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int idx, ret = 0, max_opp = info->num_opps[cluster];
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struct ve_spc_opp *opps = info->opps[cluster];
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for (idx = 0; idx < max_opp; idx++, opps++) {
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ret = dev_pm_opp_add(cpu_dev, opps->freq * 1000, opps->u_volt);
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if (ret) {
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dev_warn(cpu_dev, "failed to add opp %lu %lu\n",
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opps->freq, opps->u_volt);
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return ret;
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}
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}
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return ret;
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}
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int __init ve_spc_init(void __iomem *baseaddr, u32 a15_clusid, int irq)
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{
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int ret;
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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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if (irq <= 0) {
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pr_err(SPCLOG "Invalid IRQ %d\n", irq);
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kfree(info);
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return -EINVAL;
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}
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init_completion(&info->done);
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readl_relaxed(info->baseaddr + PWC_STATUS);
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ret = request_irq(irq, ve_spc_irq_handler, IRQF_TRIGGER_HIGH
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| IRQF_ONESHOT, "vexpress-spc", info);
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if (ret) {
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pr_err(SPCLOG "IRQ %d request failed\n", irq);
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kfree(info);
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return -ENODEV;
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}
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sema_init(&info->sem, 1);
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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;
|
|
}
|
|
|
|
struct clk_spc {
|
|
struct clk_hw hw;
|
|
int cluster;
|
|
};
|
|
|
|
#define to_clk_spc(spc) container_of(spc, struct clk_spc, hw)
|
|
static unsigned long spc_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct clk_spc *spc = to_clk_spc(hw);
|
|
u32 freq;
|
|
|
|
if (ve_spc_get_performance(spc->cluster, &freq))
|
|
return -EIO;
|
|
|
|
return freq * 1000;
|
|
}
|
|
|
|
static long spc_round_rate(struct clk_hw *hw, unsigned long drate,
|
|
unsigned long *parent_rate)
|
|
{
|
|
struct clk_spc *spc = to_clk_spc(hw);
|
|
|
|
return ve_spc_round_performance(spc->cluster, drate);
|
|
}
|
|
|
|
static int spc_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct clk_spc *spc = to_clk_spc(hw);
|
|
|
|
return ve_spc_set_performance(spc->cluster, rate / 1000);
|
|
}
|
|
|
|
static struct clk_ops clk_spc_ops = {
|
|
.recalc_rate = spc_recalc_rate,
|
|
.round_rate = spc_round_rate,
|
|
.set_rate = spc_set_rate,
|
|
};
|
|
|
|
static struct clk *ve_spc_clk_register(struct device *cpu_dev)
|
|
{
|
|
struct clk_init_data init;
|
|
struct clk_spc *spc;
|
|
|
|
spc = kzalloc(sizeof(*spc), GFP_KERNEL);
|
|
if (!spc) {
|
|
pr_err("could not allocate spc clk\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
spc->hw.init = &init;
|
|
spc->cluster = topology_physical_package_id(cpu_dev->id);
|
|
|
|
init.name = dev_name(cpu_dev);
|
|
init.ops = &clk_spc_ops;
|
|
init.flags = CLK_IS_ROOT | CLK_GET_RATE_NOCACHE;
|
|
init.num_parents = 0;
|
|
|
|
return devm_clk_register(cpu_dev, &spc->hw);
|
|
}
|
|
|
|
static int __init ve_spc_clk_init(void)
|
|
{
|
|
int cpu;
|
|
struct clk *clk;
|
|
|
|
if (!info)
|
|
return 0; /* Continue only if SPC is initialised */
|
|
|
|
if (ve_spc_populate_opps(0) || ve_spc_populate_opps(1)) {
|
|
pr_err("failed to build OPP table\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
struct device *cpu_dev = get_cpu_device(cpu);
|
|
if (!cpu_dev) {
|
|
pr_warn("failed to get cpu%d device\n", cpu);
|
|
continue;
|
|
}
|
|
clk = ve_spc_clk_register(cpu_dev);
|
|
if (IS_ERR(clk)) {
|
|
pr_warn("failed to register cpu%d clock\n", cpu);
|
|
continue;
|
|
}
|
|
if (clk_register_clkdev(clk, NULL, dev_name(cpu_dev))) {
|
|
pr_warn("failed to register cpu%d clock lookup\n", cpu);
|
|
continue;
|
|
}
|
|
|
|
if (ve_init_opp_table(cpu_dev))
|
|
pr_warn("failed to initialise cpu%d opp table\n", cpu);
|
|
}
|
|
|
|
platform_device_register_simple("vexpress-spc-cpufreq", -1, NULL, 0);
|
|
return 0;
|
|
}
|
|
module_init(ve_spc_clk_init);
|