lkml.org 
[lkml]   [2013]   [Oct]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/6] ARM: EXYNOS: add Exynos Dual Cluster Support
Date
From: Tarek Dakhran <t.dakhran@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.dakhran@samsung.com>
Signed-off-by: Vyacheslav Tyrtov <v.tyrtov@samsung.com>
---
arch/arm/mach-exynos/Makefile | 2 +
arch/arm/mach-exynos/edcs.c | 217 +++++++++++++++++++++++++++++++++++++
arch/arm/mach-exynos/edcs.h | 41 +++++++
arch/arm/mach-exynos/edcs_status.c | 110 +++++++++++++++++++
4 files changed, 370 insertions(+)
create mode 100644 arch/arm/mach-exynos/edcs.c
create mode 100644 arch/arm/mach-exynos/edcs.h
create mode 100644 arch/arm/mach-exynos/edcs_status.c

diff --git a/arch/arm/mach-exynos/Makefile b/arch/arm/mach-exynos/Makefile
index 5369615..18e6162 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-$(CONFIG_MACH_EXYNOS4_DT) += mach-exynos4-dt.o
obj-$(CONFIG_MACH_EXYNOS5_DT) += mach-exynos5-dt.o
+
+obj-$(CONFIG_ARM_CCI) += edcs.o edcs_status.o
diff --git a/arch/arm/mach-exynos/edcs.c b/arch/arm/mach-exynos/edcs.c
new file mode 100644
index 0000000..34b4e4b
--- /dev/null
+++ b/arch/arm/mach-exynos/edcs.c
@@ -0,0 +1,217 @@
+/*
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd.
+ * Author: Tarek Dakhran <t.dakhran@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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/vexpress.h>
+#include <asm/mcpm.h>
+#include <asm/proc-fns.h>
+#include <asm/cacheflush.h>
+#include <asm/cputype.h>
+#include <asm/cp15.h>
+
+#include "edcs.h"
+
+static arch_spinlock_t exynos_lock = __ARCH_SPIN_LOCK_UNLOCKED;
+static int kfs_use_count[MAX_CPUS_PER_CLUSTER][MAX_NR_CLUSTERS];
+static int core_count[MAX_NR_CLUSTERS];
+
+static int exynos_core_power_control(unsigned int cpu, unsigned int cluster,
+ int enable)
+{
+ unsigned long timeout = jiffies + msecs_to_jiffies(10);
+ unsigned int offset = cluster * MAX_CPUS_PER_CLUSTER + cpu;
+ int value = enable ? S5P_CORE_LOCAL_PWR_EN : 0;
+
+ if ((__raw_readl(EXYNOS5410_CORE_STATUS(offset)) & 0x3) == value)
+ return 0;
+
+ __raw_writel(value, EXYNOS5410_CORE_CONFIGURATION(offset));
+ do {
+ if ((__raw_readl(EXYNOS5410_CORE_STATUS(offset)) & 0x3)
+ == value)
+ return 0;
+ } while (time_before(jiffies, timeout));
+
+ return -EDEADLK;
+}
+static int exynos_cluster_power_control(unsigned int cluster, int enable)
+{
+ unsigned long timeout = jiffies + msecs_to_jiffies(10);
+ int value = enable ? S5P_CORE_LOCAL_PWR_EN : 0;
+
+ if ((__raw_readl(EXYNOS5410_COMMON_STATUS(cluster)) & 0x3)
+ == value)
+ return 0;
+
+ __raw_writel(value, EXYNOS5410_COMMON_CONFIGURATION(cluster));
+ do {
+ if ((__raw_readl(EXYNOS5410_COMMON_STATUS(cluster)) &
+ __raw_readl(EXYNOS5410_L2_STATUS(cluster)) & 0x3)
+ == value)
+ return 0;
+ } while (time_before(jiffies, timeout));
+
+ return -EDEADLK;
+}
+
+static int exynos_core_power_up(unsigned int cpu, unsigned int cluster)
+{
+ return exynos_core_power_control(cpu, cluster, 1);
+}
+
+static int exynos_core_power_down(unsigned int cpu, unsigned int cluster)
+{
+ return exynos_core_power_control(cpu, cluster, 0);
+}
+
+static int exynos_cluster_power_up(unsigned int cluster)
+{
+ return exynos_cluster_power_control(cluster, 1);
+}
+
+static int exynos_power_up(unsigned int cpu, unsigned int cluster)
+{
+ int ret;
+ local_irq_disable();
+ arch_spin_lock(&exynos_lock);
+
+ pr_info("A%d CORE%d\n", 15 - cluster * 8, cpu);
+ kfs_use_count[cpu][cluster]++;
+ if (kfs_use_count[cpu][cluster] == 1) {
+ ++core_count[cluster];
+ if (core_count[cluster] == 1) {
+ ret = exynos_cluster_power_up(cluster);
+ if (ret) {
+ pr_err("%s: cluster %u power up error\n",
+ __func__, cluster);
+ return ret;
+ }
+ __cci_control_port_by_index(MAX_NR_CLUSTERS
+ - cluster, true);
+ }
+ ret = exynos_core_power_up(cpu, cluster);
+ if (ret) {
+ pr_err("%s: cpu %u cluster %u power up error\n",
+ __func__, cpu, cluster);
+ return ret;
+ }
+ } else if (kfs_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(&exynos_lock);
+ local_irq_enable();
+ return 0;
+}
+static void exynos_power_down(void)
+{
+ unsigned int mpidr, cpu, cluster;
+ bool last_man = false, skip_wfi = false;
+ mpidr = read_cpuid_mpidr();
+ cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+ cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+
+ pr_info("A%d CORE%d\n", 15 - cluster * 8, cpu);
+ BUG_ON(cpu >= MAX_CPUS_PER_CLUSTER || cluster >= MAX_NR_CLUSTERS);
+ __mcpm_cpu_going_down(cpu, cluster);
+ arch_spin_lock(&exynos_lock);
+ BUG_ON(__mcpm_cluster_state(cluster) != CLUSTER_UP);
+ kfs_use_count[cpu][cluster]--;
+
+ if (kfs_use_count[cpu][cluster] == 0) {
+ exynos_core_power_down(cpu, cluster);
+ --core_count[cluster];
+ if (core_count[cluster] == 0)
+ last_man = true;
+
+ } else if (kfs_use_count[cpu][cluster] == 1) {
+ skip_wfi = true;
+ } else
+ BUG();
+ if (last_man && __mcpm_outbound_enter_critical(cpu, cluster)) {
+ arch_spin_unlock(&exynos_lock);
+ flush_cache_all();
+ set_cr(get_cr() & ~CR_C);
+ flush_cache_all();
+ outer_flush_all();
+ set_auxcr(get_auxcr() & ~(1 << 6));
+ cci_disable_port_by_cpu(mpidr);
+ __mcpm_outbound_leave_critical(cluster, CLUSTER_DOWN);
+ } else {
+ arch_spin_unlock(&exynos_lock);
+ flush_cache_louis();
+ set_cr(get_cr() & ~CR_C);
+ flush_cache_louis();
+ set_auxcr(get_auxcr() & ~(1 << 6));
+ }
+ __mcpm_cpu_down(cpu, cluster);
+
+ dsb();
+ if (!skip_wfi)
+ wfi();
+}
+static const struct mcpm_platform_ops exynos_power_ops = {
+ .power_up = exynos_power_up,
+ .power_down = exynos_power_down,
+};
+
+static void __init edcs_data_init(void)
+{
+ unsigned int mpidr, cpu, cluster;
+
+ mpidr = read_cpuid_mpidr();
+ cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+ cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+ pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
+ BUG_ON(cpu >= 4 || cluster >= 2);
+ kfs_use_count[cpu][cluster] = 1;
+ ++core_count[cluster];
+ __cci_control_port_by_index(MAX_NR_CLUSTERS - cluster, true);
+}
+
+
+static int __init edcs_init(void)
+{
+ struct device_node *node;
+
+ if (!cci_probed())
+ return -ENODEV;
+
+ node = of_find_compatible_node(NULL, NULL, "samsung,edcs");
+ if (!node)
+ return -ENODEV;
+ edcs_data_init();
+ mcpm_smp_set_ops();
+ mcpm_platform_register(&exynos_power_ops);
+
+ /*
+ * Future entries into the kernel can now go
+ * through the cluster entry vectors.
+ */
+
+ __raw_writel(virt_to_phys(mcpm_entry_point),
+ S5P_VA_SYSRAM_NS + 0x1c);
+
+ pr_info("EDCS: EXYNOS5410 DUAL CLUSTER SUPPORT installed\n");
+
+ return 0;
+}
+
+early_initcall(edcs_init);
diff --git a/arch/arm/mach-exynos/edcs.h b/arch/arm/mach-exynos/edcs.h
new file mode 100644
index 0000000..dd3e204
--- /dev/null
+++ b/arch/arm/mach-exynos/edcs.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd.
+ * Author: Tarek Dakhran <t.dakhran@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.
+ */
+
+#include <linux/arm-cci.h>
+#include <linux/of_address.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <mach/regs-pmu.h>
+
+#define EXYNOS5410_ARM_COMMON_CONFIGURATION S5P_PMUREG(0x2500)
+#define EXYNOS5410_COMMON_CONFIGURATION(_nr) \
+ (EXYNOS5410_ARM_COMMON_CONFIGURATION + ((_nr) * 0x80))
+#define EXYNOS5410_COMMON_STATUS(_nr) \
+ (EXYNOS5410_COMMON_CONFIGURATION(_nr) + 0x4)
+#define EXYNOS5410_COMMON_OPTION(_nr) \
+ (EXYNOS5410_COMMON_CONFIGURATION(_nr) + 0x8)
+
+#define EXYNOS5410_ARM_L2_CONFIGURATION S5P_PMUREG(0x2600)
+#define EXYNOS5410_L2_CONFIGURATION(_nr) \
+ (EXYNOS5410_ARM_L2_CONFIGURATION + ((_nr) * 0x80))
+#define EXYNOS5410_L2_STATUS(_nr) \
+ (EXYNOS5410_L2_CONFIGURATION(_nr) + 0x4)
+#define EXYNOS5410_L2_OPTION(_nr) \
+ (EXYNOS5410_L2_CONFIGURATION(_nr) + 0x8)
+
+#define EXYNOS5410_CORE_CONFIGURATION(_nr) \
+ (S5P_ARM_CORE0_CONFIGURATION + ((_nr) * 0x80))
+#define EXYNOS5410_CORE_STATUS(_nr) \
+ (EXYNOS5410_CORE_CONFIGURATION(_nr) + 0x4)
+#define EXYNOS5410_CORE_OPTION(_nr) \
+ (EXYNOS5410_CORE_CONFIGURATION(_nr) + 0x8)
+
+#define EXYNOS5_PA_CCI 0x10D20000
diff --git a/arch/arm/mach-exynos/edcs_status.c b/arch/arm/mach-exynos/edcs_status.c
new file mode 100644
index 0000000..bff1e7f
--- /dev/null
+++ b/arch/arm/mach-exynos/edcs_status.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd.
+ * Author: Tarek Dakhran <t.dakhran@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.
+ */
+
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <asm/uaccess.h>
+
+#include "edcs.h"
+
+int edcs_check_status(char *info)
+{
+ size_t it = 30;
+ int i;
+
+ void __iomem *cci_base;
+
+ cci_base = ioremap(EXYNOS5_PA_CCI, SZ_64K);
+ if (!cci_base)
+ return -ENOMEM;
+
+ if ((__raw_readl(EXYNOS5410_COMMON_STATUS(0)) & 0x3) == 3)
+ info[it] = '1';
+ it += 3;
+
+ for (i = 0; i < 4; i++) {
+ if ((__raw_readl(EXYNOS5410_CORE_STATUS(i)) & 0x3) == 3)
+ info[it] = '1';
+ it += 3;
+ }
+
+ if ((__raw_readl(EXYNOS5410_L2_STATUS(0)) & 0x3) == 3)
+ info[it] = '1';
+ it += 3;
+
+ if ((readl(cci_base + 0x4000 + 1 * 0x1000) & 0x3) == 3)
+ info[it] = '1';
+
+ it += 10;
+
+ if ((__raw_readl(EXYNOS5410_COMMON_STATUS(1)) & 0x3) == 3)
+ info[it] = '1';
+ it += 3;
+
+ for (i = 4; i < 8; i++) {
+ if ((__raw_readl(EXYNOS5410_CORE_STATUS(i)) & 0x3) == 3)
+ info[it] = '1';
+ it += 3;
+ }
+
+ if ((__raw_readl(EXYNOS5410_L2_STATUS(1)) & 0x3) == 3)
+ info[it] = '1';
+ it += 3;
+
+ if ((readl(cci_base + 0x4000 + 0 * 0x1000) & 0x3) == 3)
+ info[it] = '1';
+
+ iounmap(cci_base);
+ return 0;
+}
+
+static ssize_t edcs_status_read(struct file *file, char __user *buf,
+ size_t len, loff_t *pos)
+{
+
+ char info[] = "\tC 0 1 2 3 L2 CCI\n"
+ "[A15] 0 0 0 0 0 0 0\n"
+ " [A7] 0 0 0 0 0 0 0\n";
+ size_t count = sizeof(info);
+ edcs_check_status(info);
+ return simple_read_from_buffer(buf, len, pos, info, count);
+}
+
+static const struct file_operations edcs_status_fops = {
+ .read = edcs_status_read,
+ .owner = THIS_MODULE,
+};
+static struct miscdevice edcs_status_device = {
+ .name = "edcs_status",
+ .minor = 255,
+ .fops = &edcs_status_fops,
+};
+
+static int __init edcs_dev_init(void)
+{
+ struct device_node *node;
+ int ret;
+ if (!cci_probed())
+ return -ENODEV;
+
+ node = of_find_compatible_node(NULL, NULL, "samsung,edcs");
+ if (!node)
+ return -ENODEV;
+
+ ret = misc_register(&edcs_status_device);
+ if (ret) {
+ pr_err("EDCS: edcs_status device is not registered\n");
+ return ret;
+ }
+ pr_info("EDCS: edcs_status device registered\n");
+ return 0;
+}
+device_initcall(edcs_dev_init);
--
1.8.1.5


\
 
 \ /
  Last update: 2013-10-01 18:41    [W:0.079 / U:53.444 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site