new file mode 100644
@@ -0,0 +1,30 @@
+* ARM Versatile Express Serial Power Controller device tree bindings
+
+Latest ARM development boards implement a power management interface (serial
+power controller - SPC) that is capable of managing power states transitions,
+wake-up IRQs and resume addresses for ARM multiprocessor testchips.
+The serial controller can be programmed through a memory mapped interface
+that enables communication between firmware running on the microcontroller
+managing power states and the application processors.
+
+The SPC DT bindings are defined as follows:
+
+- spc node
+
+ - compatible:
+ Usage: required
+ Value type: <stringlist>
+ Definition: must be
+ "arm,vexpress-spc,v2p-ca15_a7", "arm,vexpress-spc"
+ - reg:
+ Usage: required
+ Value type: <prop-encode-array>
+ Definition: A standard property that specifies the base address
+ and the size of the SPC address space
+
+Example:
+
+spc@7fff0b00 {
+ compatible = "arm,vexpress-spc,v2p-ca15_a7", "arm,vexpress-spc";
+ reg = <0x7fff0b00 0x100>;
+};
new file mode 100644
@@ -0,0 +1,246 @@
+/*
+ * Versatile Express Serial Power Controller (SPC) support
+ *
+ * Copyright (C) 2013 ARM Ltd.
+ *
+ * Authors: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
+ * Achin Gupta <achin.gupta@arm.com>
+ * Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/vexpress.h>
+
+#include <asm/cacheflush.h>
+
+#define SPCLOG "vexpress-spc: "
+
+/* SCC conf registers */
+#define A15_CONF 0x400
+#define SYS_INFO 0x700
+
+/* SPC wake-up IRQs status and mask */
+#define WAKE_INT_MASK 0x24
+#define WAKE_INT_RAW 0x28
+#define WAKE_INT_STAT 0x2c
+/* SPC power down registers */
+#define A15_PWRDN_EN 0x30
+#define A7_PWRDN_EN 0x34
+/* SPC per-CPU mailboxes */
+#define A15_BX_ADDR0 0x68
+#define A7_BX_ADDR0 0x78
+
+/* wake-up interrupt masks */
+#define GBL_WAKEUP_INT_MSK (0x3 << 10)
+
+/* TC2 static dual-cluster configuration */
+#define MAX_CLUSTERS 2
+
+struct ve_spc_drvdata {
+ void __iomem *baseaddr;
+ /*
+ * A15s cluster identifier
+ * It corresponds to A15 processors MPIDR[15:8] bitfield
+ */
+ u32 a15_clusid;
+};
+
+static struct ve_spc_drvdata *info;
+
+static inline bool cluster_is_a15(u32 cluster)
+{
+ return cluster == info->a15_clusid;
+}
+
+/**
+ * ve_spc_global_wakeup_irq()
+ *
+ * Function to set/clear global wakeup IRQs. Not protected by locking since
+ * it might be used in code paths where normal cacheable locks are not
+ * working. Locking must be provided by the caller to ensure atomicity.
+ *
+ * @set: if true, global wake-up IRQs are set, if false they are cleared
+ */
+void ve_spc_global_wakeup_irq(bool set)
+{
+ u32 reg;
+
+ reg = readl_relaxed(info->baseaddr + WAKE_INT_MASK);
+
+ if (set)
+ reg |= GBL_WAKEUP_INT_MSK;
+ else
+ reg &= ~GBL_WAKEUP_INT_MSK;
+
+ writel_relaxed(reg, info->baseaddr + WAKE_INT_MASK);
+}
+
+/**
+ * ve_spc_cpu_wakeup_irq()
+ *
+ * Function to set/clear per-CPU wake-up IRQs. Not protected by locking since
+ * it might be used in code paths where normal cacheable locks are not
+ * working. Locking must be provided by the caller to ensure atomicity.
+ *
+ * @cluster: mpidr[15:8] bitfield describing cluster affinity level
+ * @cpu: mpidr[7:0] bitfield describing cpu affinity level
+ * @set: if true, wake-up IRQs are set, if false they are cleared
+ */
+void ve_spc_cpu_wakeup_irq(u32 cluster, u32 cpu, bool set)
+{
+ u32 mask, reg;
+
+ if (cluster >= MAX_CLUSTERS)
+ return;
+
+ mask = 1 << cpu;
+
+ if (!cluster_is_a15(cluster))
+ mask <<= 4;
+
+ reg = readl_relaxed(info->baseaddr + WAKE_INT_MASK);
+
+ if (set)
+ reg |= mask;
+ else
+ reg &= ~mask;
+
+ writel_relaxed(reg, info->baseaddr + WAKE_INT_MASK);
+}
+
+/**
+ * ve_spc_set_resume_addr() - set the jump address used for warm boot
+ *
+ * @cluster: mpidr[15:8] bitfield describing cluster affinity level
+ * @cpu: mpidr[7:0] bitfield describing cpu affinity level
+ * @addr: physical resume address
+ */
+void ve_spc_set_resume_addr(u32 cluster, u32 cpu, u32 addr)
+{
+ void __iomem *baseaddr;
+
+ if (cluster >= MAX_CLUSTERS)
+ return;
+
+ if (cluster_is_a15(cluster))
+ baseaddr = info->baseaddr + A15_BX_ADDR0 + (cpu << 2);
+ else
+ baseaddr = info->baseaddr + A7_BX_ADDR0 + (cpu << 2);
+
+ writel_relaxed(addr, baseaddr);
+}
+
+/**
+ * ve_spc_get_nr_cpus() - get number of cpus in a cluster
+ *
+ * @cluster: mpidr[15:8] bitfield describing cluster affinity level
+ *
+ * Return: > 0 number of cpus in the cluster
+ * or 0 if cluster number invalid
+ */
+u32 ve_spc_get_nr_cpus(u32 cluster)
+{
+ u32 val;
+
+ if (cluster >= MAX_CLUSTERS)
+ return 0;
+
+ val = readl_relaxed(info->baseaddr + SYS_INFO);
+ val = cluster_is_a15(cluster) ? (val >> 16) : (val >> 20);
+ return val & 0xf;
+}
+
+/**
+ * ve_spc_powerdown()
+ *
+ * Function to enable/disable cluster powerdown. Not protected by locking
+ * since it might be used in code paths where normal cacheable locks are not
+ * working. Locking must be provided by the caller to ensure atomicity.
+ *
+ * @cluster: mpidr[15:8] bitfield describing cluster affinity level
+ * @enable: if true enables powerdown, if false disables it
+ */
+void ve_spc_powerdown(u32 cluster, bool enable)
+{
+ u32 pwdrn_reg;
+
+ if (cluster >= MAX_CLUSTERS)
+ return;
+
+ pwdrn_reg = cluster_is_a15(cluster) ? A15_PWRDN_EN : A7_PWRDN_EN;
+ writel_relaxed(enable, info->baseaddr + pwdrn_reg);
+}
+
+static int __init ve_spc_probe(void)
+{
+ int ret;
+ struct device_node *dn;
+
+ dn = of_find_compatible_node(NULL, NULL,
+ "arm,vexpress-scc,v2p-ca15_a7");
+
+ if (!dn)
+ return -ENODEV;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ pr_err(SPCLOG "unable to allocate mem\n");
+ return -ENOMEM;
+ }
+
+ info->baseaddr = of_iomap(dn, 0);
+ if (!info->baseaddr) {
+ pr_err(SPCLOG "unable to ioremap memory\n");
+ ret = -ENXIO;
+ goto mem_free;
+ }
+
+ info->a15_clusid = readl_relaxed(info->baseaddr + A15_CONF) & 0xf;
+
+ /*
+ * Multi-cluster systems may need this data when non-coherent, during
+ * cluster power-up/power-down. Make sure driver info reaches main
+ * memory.
+ */
+ sync_cache_w(info);
+ sync_cache_w(&info);
+
+ return 0;
+
+mem_free:
+ kfree(info);
+ return ret;
+}
+
+/**
+ * ve_spc_init()
+ *
+ * Function exported to manage pre early_initcall initialization.
+ * SPC code is needed very early in the boot process to bring CPUs out of
+ * reset and initialize power management back-end so an init interface is
+ * provided to platform code to allow early initialization. The init
+ * interface can be removed as soon as the DT layer and platform bus allow
+ * platform device creation and probing before SMP boot.
+ */
+int __init ve_spc_init(void)
+{
+ static int ve_spc_init_status __initdata = -EAGAIN;
+
+ if (ve_spc_init_status == -EAGAIN)
+ ve_spc_init_status = ve_spc_probe();
+
+ return ve_spc_init_status;
+}
new file mode 100644
@@ -0,0 +1,25 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Copyright (C) 2012 ARM Limited
+ */
+
+
+#ifndef __SPC_H_
+#define __SPC_H_
+
+int __init ve_spc_init(void);
+void ve_spc_global_wakeup_irq(bool set);
+void ve_spc_cpu_wakeup_irq(u32 cluster, u32 cpu, bool set);
+void ve_spc_set_resume_addr(u32 cluster, u32 cpu, u32 addr);
+u32 ve_spc_get_nr_cpus(u32 cluster);
+void ve_spc_powerdown(u32 cluster, bool enable);
+
+#endif
@@ -4,4 +4,3 @@ endif
if GOLDFISH
source "drivers/platform/goldfish/Kconfig"
endif
-