From: Tarek Dakhran <t.dakh...@samsung.com>
Add EDCS(Exynos Dual Cluster Support) for Samsung Exynos5410 SoC.
This enables all 8 cores, 4 x A7 and 4 x A15 run at the same time.
Signed-off-by: Tarek Dakhran <t.dakh...@samsung.com>
Signed-off-by: Vyacheslav Tyrtov <v.tyr...@samsung.com>
---
arch/arm/mach-exynos/Makefile | 2 +
arch/arm/mach-exynos/edcs.c | 297 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 299 insertions(+)
create mode 100644 arch/arm/mach-exynos/edcs.c
diff --git a/arch/arm/mach-exynos/Makefile b/arch/arm/mach-exynos/Makefile
index 8930b66..bc1f7f9 100644
--- a/arch/arm/mach-exynos/Makefile
+++ b/arch/arm/mach-exynos/Makefile
@@ -34,3 +34,5 @@ AFLAGS_exynos-smc.o :=-Wa,-march=armv7-a$(plus_sec)
obj-$(CONFIG_ARCH_EXYNOS4) += mach-exynos4-dt.o
obj-$(CONFIG_ARCH_EXYNOS5) += mach-exynos5-dt.o
+
+obj-$(CONFIG_SOC_EXYNOS5410) += edcs.o
diff --git a/arch/arm/mach-exynos/edcs.c b/arch/arm/mach-exynos/edcs.c
new file mode 100644
index 0000000..29f0bdd
--- /dev/null
+++ b/arch/arm/mach-exynos/edcs.c
@@ -0,0 +1,297 @@
+/*
+ * arch/arm/mach-exynos/edcs.c - exynos dual cluster power management support
+ *
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd.
+ * Author: Tarek Dakhran <t.dakh...@samsung.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.
+ *
+ * EDCS(exynos dual cluster support) for Exynos5410 SoC.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/irqchip/arm-gic.h>
+#include <linux/delay.h>
+
+#include <asm/mcpm.h>
+#include <asm/proc-fns.h>
+#include <asm/cacheflush.h>
+#include <asm/cputype.h>
+#include <asm/cp15.h>
+
+#include <linux/arm-cci.h>
+#include <mach/regs-pmu.h>
+
+#define EDCS_CPUS_PER_CLUSTER 4
+#define EDCS_CLUSTERS 2
+
+/* Exynos5410 power management registers */
+#define EDCS_CORE_CONFIGURATION(_nr) (S5P_ARM_CORE0_CONFIGURATION \
+ + ((_nr) * 0x80))
+#define EDCS_CORE_STATUS(_nr) (EDCS_CORE_CONFIGURATION(_nr) + 0x4)
+#define EDCS_CORE_OPTION(_nr) (EDCS_CORE_CONFIGURATION(_nr) + 0x8)
+
+#define REG_CPU_STATE_ADDR0 (S5P_VA_SYSRAM_NS + 0x28)
+#define REG_CPU_STATE_ADDR(_nr) (REG_CPU_STATE_ADDR0 + \
+ (_nr) * EDCS_CPUS_PER_CLUSTER)
+
+#define SECONDARY_RESET (1 << 1)
+#define REG_ENTRY_ADDR (S5P_VA_SYSRAM_NS + 0x1c)
+
+#define EDCS_CORE_PWR_ON 0x3
+#define EDCS_CORE_PWR_OFF 0x0
+#define CORE_PWR_STATE_MASK 0x3
+
+static arch_spinlock_t edcs_lock = __ARCH_SPIN_LOCK_UNLOCKED;
+
+static int edcs_use_count[EDCS_CPUS_PER_CLUSTER][EDCS_CLUSTERS];
+static int core_count[EDCS_CLUSTERS];
+
+/*
+ * this_core_to_pcpu reads mpidr and defines cluster and cpu.
+ */
+static void this_core_to_pcpu(unsigned int *pcpu, unsigned int *pcluster)
+{
+ unsigned int mpidr;
+
+ mpidr = read_cpuid_mpidr();
+ *pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+ *pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+}
+
+/*
+ * core_power_state is used to get core power state.
+ * returns:
+ * 0x0 - powered off;
+ * 0x3 - powered on;
+ * other values - in process;
+ */
+static int core_power_state(unsigned int cpu, unsigned int cluster)
+{
+ unsigned int offset = cluster * EDCS_CPUS_PER_CLUSTER + cpu;
+ int status = readl_relaxed(EDCS_CORE_STATUS(offset));
+
+ return status & CORE_PWR_STATE_MASK;
+}
+
+static void edcs_core_power_up(unsigned int cpu, unsigned int cluster)
+{
+ unsigned int offset = cluster * EDCS_CPUS_PER_CLUSTER + cpu;
+ if (core_power_state(cpu, cluster) == EDCS_CORE_PWR_OFF) {
+ /* boot flag should be written before powering up */
+ wmb();
+ writel_relaxed(EDCS_CORE_PWR_ON,
+ EDCS_CORE_CONFIGURATION(offset));
+ }
+}
+
+static void edcs_core_power_down(unsigned int cpu, unsigned int cluster)
+{
+ unsigned int offset = cluster * EDCS_CPUS_PER_CLUSTER + cpu;
+ if (core_power_state(cpu, cluster) == EDCS_CORE_PWR_ON)
+ writel_relaxed(EDCS_CORE_PWR_OFF,
+ EDCS_CORE_CONFIGURATION(offset));
+}
+
+void set_boot_flag(unsigned int cpu, unsigned int mode)
+{
+ writel_relaxed(mode, REG_CPU_STATE_ADDR(cpu));
+}
+
+static int edcs_power_up(unsigned int cpu, unsigned int cluster)
+{
+ pr_debug("cpu %u cluster %u\n", cpu, cluster);
+ BUG_ON(cpu >= EDCS_CPUS_PER_CLUSTER || cluster >= EDCS_CLUSTERS);
+
+ local_irq_disable();
+ arch_spin_lock(&edcs_lock);
+
+ edcs_use_count[cpu][cluster]++;
+ if (edcs_use_count[cpu][cluster] == 1) {
+ ++core_count[cluster];
+ set_boot_flag(cpu, SECONDARY_RESET);
+ edcs_core_power_up(cpu, cluster);
+ } else if (edcs_use_count[cpu][cluster] != 2) {
+ /*
+ * The only possible values are:
+ * 0 = CPU down
+ * 1 = CPU (still) up
+ * 2 = CPU requested to be up before it had a chance
+ * to actually make itself down.
+ * Any other value is a bug.
+ */
+ BUG();
+ }
+
+ arch_spin_unlock(&edcs_lock);
+ local_irq_enable();
+
+ return 0;
+}
+static void edcs_power_down(void)
+{
+ unsigned int mpidr, cpu, cluster;
+ bool last_man = false, skip_wfi = false;
+
+ this_core_to_pcpu(&cpu, &cluster);
+ mpidr = read_cpuid_mpidr();
+
+ pr_debug("cpu %u cluster %u\n", cpu, cluster);
+ BUG_ON(cpu >= EDCS_CPUS_PER_CLUSTER || cluster >= EDCS_CLUSTERS);
+
+ __mcpm_cpu_going_down(cpu, cluster);
+
+ arch_spin_lock(&edcs_lock);
+ BUG_ON(__mcpm_cluster_state(cluster) != CLUSTER_UP);
+ edcs_use_count[cpu][cluster]--;
+ if (edcs_use_count[cpu][cluster] == 0) {
+ --core_count[cluster];
+ edcs_core_power_down(cpu, cluster);
+ if (core_count[cluster] == 0)
+ last_man = true;
+ } else if (edcs_use_count[cpu][cluster] == 1) {
+ /*
+ * A power_up request went ahead of us.
+ * Even if we do not want to shut this CPU down,
+ * the caller expects a certain state as if the WFI
+ * was aborted. So let's continue with cache cleaning.
+ */
+ skip_wfi = true;
+ } else
+ BUG();
+
+ if (!skip_wfi)
+ gic_cpu_if_down();
+
+ if (last_man && __mcpm_outbound_enter_critical(cpu, cluster)) {
+ arch_spin_unlock(&edcs_lock);
+
+ if (read_cpuid_part_number() == ARM_CPU_PART_CORTEX_A15) {
+ /*
+ * On the Cortex-A15 we need to disable
+ * L2 prefetching before flushing the cache.
+ */
+ asm volatile(
+ "mcr p15, 1, %0, c15, c0, 3\n\t"
+ "isb\n\t"
+ "dsb"
+ : : "r" (0x400));
+ }
+
+ /*
+ * We need to disable and flush the whole (L1 and L2) cache.
+ * Let's do it in the safest possible way i.e. with
+ * no memory access within the following sequence
+ * including the stack.
+ *
+ * Note: fp is preserved to the stack explicitly prior doing
+ * this since adding it to the clobber list is incompatible
+ * with having CONFIG_FRAME_POINTER=y.
+ */
+ v7_exit_coherency_flush(all);
+
+ cci_disable_port_by_cpu(mpidr);
+
+ __mcpm_outbound_leave_critical(cluster, CLUSTER_DOWN);
+
+ } else {
+ arch_spin_unlock(&edcs_lock);
+ /*
+ * We need to disable and flush only the L1 cache.
+ * Let's do it in the safest possible way as above.
+ */
+ v7_exit_coherency_flush(louis);
+
+ }
+ __mcpm_cpu_down(cpu, cluster);
+
+ if (!skip_wfi)
+ wfi();
+}
+
+static int edcs_power_down_finish(unsigned int cpu, unsigned int cluster)
+{
+ unsigned int timeout = 1000;
+ unsigned int sleep_time = 10;
+
+ pr_debug("cpu %u cluster %u\n", cpu, cluster);
+ BUG_ON(cpu >= EDCS_CPUS_PER_CLUSTER || cluster >= EDCS_CLUSTERS);
+
+ do {
+ if (ACCESS_ONCE(edcs_use_count[cpu][cluster]) == 0) {
+ /* checking if core powered down */
+ if (core_power_state(cpu, cluster) == EDCS_CORE_PWR_OFF)
+ return 0;
+ }
+ msleep(sleep_time);
+ timeout -= sleep_time;
+ } while (timeout);
+
+ return -ETIMEDOUT; /* timeout */
+}
+
+static const struct mcpm_platform_ops edcs_power_ops = {
+ .power_up = edcs_power_up,
+ .power_down = edcs_power_down,
+ .power_down_finish = edcs_power_down_finish,
+};
+
+static void __init edcs_data_init(void)
+{
+ unsigned int cpu, cluster;
+
+ this_core_to_pcpu(&cpu, &cluster);
+
+ pr_debug("cpu %u cluster %u\n", cpu, cluster);
+ BUG_ON(cpu >= EDCS_CPUS_PER_CLUSTER || cluster >= EDCS_CLUSTERS);
+ edcs_use_count[cpu][cluster] = 1;
+ ++core_count[cluster];
+}
+
+/*
+ * Enable cluster-level coherency, in preparation for turning on the MMU.
+ */
+static void __naked edcs_power_up_setup(unsigned int affinity_level)
+{
+ asm volatile ("\n"
+ "b cci_enable_port_for_self");
+}
+
+static int __init edcs_init(void)
+{
+ int ret;
+ struct device_node *node;
+
+ node = of_find_compatible_node(NULL, NULL, "samsung,exynos5410");
+ if (!node)
+ return -ENODEV;
+
+ if (!cci_probed())
+ return -ENODEV;
+
+ /*
+ * Future entries into the kernel can now go
+ * through the cluster entry vectors.
+ */
+ writel_relaxed(virt_to_phys(mcpm_entry_point), REG_ENTRY_ADDR);
+
+ edcs_data_init();
+ mcpm_smp_set_ops();
+
+ ret = mcpm_platform_register(&edcs_power_ops);
+ if (!ret) {
+ mcpm_sync_init(edcs_power_up_setup);
+ pr_info("EDCS power management initialized\n");
+ }
+ return ret;
+}
+
+early_initcall(edcs_init);
--
1.8.1.5
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