[PATCH v16 2/9] ARM: hisi: enable MCPM implementation
Haojian Zhuang
haojian.zhuang at linaro.org
Sun Aug 3 19:58:01 PDT 2014
Multiple CPU clusters are used in Hisilicon HiP04 SoC. Now use MCPM
framework to manage power on HiP04 SoC.
Changelog:
v16:
* Parse bootwrapper parameters in command line instead.
v13:
* Restore power down operation in MCPM.
* Fix disabling snoop filter issue in MCPM.
v12:
* Use wfi as power down state in MCPM.
* Remove wait_for_powerdown() in MCPM because wfi is used now.
Signed-off-by: Haojian Zhuang <haojian.zhuang at linaro.org>
---
arch/arm/mach-hisi/Makefile | 1 +
arch/arm/mach-hisi/platmcpm.c | 374 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 375 insertions(+)
create mode 100644 arch/arm/mach-hisi/platmcpm.c
diff --git a/arch/arm/mach-hisi/Makefile b/arch/arm/mach-hisi/Makefile
index ee2506b..d64831e 100644
--- a/arch/arm/mach-hisi/Makefile
+++ b/arch/arm/mach-hisi/Makefile
@@ -3,4 +3,5 @@
#
obj-y += hisilicon.o
+obj-$(CONFIG_MCPM) += platmcpm.o
obj-$(CONFIG_SMP) += platsmp.o hotplug.o headsmp.o
diff --git a/arch/arm/mach-hisi/platmcpm.c b/arch/arm/mach-hisi/platmcpm.c
new file mode 100644
index 0000000..fc17973
--- /dev/null
+++ b/arch/arm/mach-hisi/platmcpm.c
@@ -0,0 +1,374 @@
+/*
+ * Copyright (c) 2013-2014 Linaro Ltd.
+ * Copyright (c) 2013-2014 Hisilicon Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/memblock.h>
+#include <linux/of_address.h>
+
+#include <asm/cputype.h>
+#include <asm/cp15.h>
+#include <asm/mcpm.h>
+
+#include "core.h"
+
+/* bits definition in SC_CPU_RESET_REQ[x]/SC_CPU_RESET_DREQ[x]
+ * 1 -- unreset; 0 -- reset
+ */
+#define CORE_RESET_BIT(x) (1 << x)
+#define NEON_RESET_BIT(x) (1 << (x + 4))
+#define CORE_DEBUG_RESET_BIT(x) (1 << (x + 9))
+#define CLUSTER_L2_RESET_BIT (1 << 8)
+#define CLUSTER_DEBUG_RESET_BIT (1 << 13)
+
+/*
+ * bits definition in SC_CPU_RESET_STATUS[x]
+ * 1 -- reset status; 0 -- unreset status
+ */
+#define CORE_RESET_STATUS(x) (1 << x)
+#define NEON_RESET_STATUS(x) (1 << (x + 4))
+#define CORE_DEBUG_RESET_STATUS(x) (1 << (x + 9))
+#define CLUSTER_L2_RESET_STATUS (1 << 8)
+#define CLUSTER_DEBUG_RESET_STATUS (1 << 13)
+#define CORE_WFI_STATUS(x) (1 << (x + 16))
+#define CORE_WFE_STATUS(x) (1 << (x + 20))
+#define CORE_DEBUG_ACK(x) (1 << (x + 24))
+
+#define SC_CPU_RESET_REQ(x) (0x520 + (x << 3)) /* reset */
+#define SC_CPU_RESET_DREQ(x) (0x524 + (x << 3)) /* unreset */
+#define SC_CPU_RESET_STATUS(x) (0x1520 + (x << 3))
+
+#define FAB_SF_MODE 0x0c
+#define FAB_SF_INVLD 0x10
+
+/* bits definition in FB_SF_INVLD */
+#define FB_SF_INVLD_START (1 << 8)
+
+#define HIP04_MAX_CLUSTERS 4
+#define HIP04_MAX_CPUS_PER_CLUSTER 4
+
+#define POLL_MSEC 10
+#define TIMEOUT_MSEC 1000
+
+struct hip04_secondary_cpu_data {
+ u32 bootwrapper_phys;
+ u32 bootwrapper_size;
+ u32 bootwrapper_magic;
+ u32 relocation_entry;
+ u32 relocation_size;
+};
+
+static void __iomem *relocation, *sysctrl, *fabric;
+static int hip04_cpu_table[HIP04_MAX_CLUSTERS][HIP04_MAX_CPUS_PER_CLUSTER];
+static DEFINE_SPINLOCK(boot_lock);
+static struct hip04_secondary_cpu_data hip04_boot;
+static u32 fabric_phys_addr;
+
+static int __init hip04_parse_bootwrapper(char *p)
+{
+ int data[4];
+
+ get_options(p, ARRAY_SIZE(data), &data[0]);
+ if (!data[0] || (data[0] < 3)) {
+ pr_err("fail to parse bootwrapper parameters\n");
+ return -EINVAL;
+ }
+ hip04_boot.bootwrapper_phys = data[1];
+ hip04_boot.bootwrapper_size = data[2];
+ hip04_boot.bootwrapper_magic = data[3];
+ memblock_reserve(data[1], data[2]);
+ return 0;
+}
+early_param("bootwrapper", hip04_parse_bootwrapper);
+
+static int __init hip04_parse_relocation(char *p)
+{
+ int data[3];
+
+ get_options(p, ARRAY_SIZE(data), &data[0]);
+ if (!data[0] || (data[0] < 2)) {
+ pr_err("fail to parse relocation parameters\n");
+ return -EINVAL;
+ }
+ hip04_boot.relocation_entry = data[1];
+ hip04_boot.relocation_size = data[2];
+ return 0;
+}
+early_param("relocation", hip04_parse_relocation);
+
+static bool hip04_cluster_down(unsigned int cluster)
+{
+ int i;
+
+ for (i = 0; i < HIP04_MAX_CPUS_PER_CLUSTER; i++)
+ if (hip04_cpu_table[cluster][i])
+ return false;
+ return true;
+}
+
+static void hip04_set_snoop_filter(unsigned int cluster, unsigned int on)
+{
+ unsigned long data;
+
+ if (!fabric)
+ BUG();
+ data = readl_relaxed(fabric + FAB_SF_MODE);
+ if (on)
+ data |= 1 << cluster;
+ else
+ data &= ~(1 << cluster);
+ writel_relaxed(data, fabric + FAB_SF_MODE);
+ while (1) {
+ if (data == readl_relaxed(fabric + FAB_SF_MODE))
+ break;
+ }
+ return;
+}
+
+static int hip04_mcpm_power_up(unsigned int cpu, unsigned int cluster)
+{
+ unsigned long data, mask;
+
+ if (!relocation || !sysctrl)
+ return -ENODEV;
+ if (cluster >= HIP04_MAX_CLUSTERS || cpu >= HIP04_MAX_CPUS_PER_CLUSTER)
+ return -EINVAL;
+
+ spin_lock_irq(&boot_lock);
+
+ if (hip04_cpu_table[cluster][cpu])
+ goto out;
+
+ /* Make secondary core out of reset. */
+ writel_relaxed(hip04_boot.bootwrapper_phys, relocation);
+ writel_relaxed(hip04_boot.bootwrapper_magic, relocation + 4);
+ writel_relaxed(virt_to_phys(mcpm_entry_point), relocation + 8);
+ writel_relaxed(0, relocation + 12);
+
+ if (hip04_cluster_down(cluster)) {
+ data = CLUSTER_DEBUG_RESET_BIT;
+ writel_relaxed(data, sysctrl + SC_CPU_RESET_DREQ(cluster));
+ do {
+ mask = CLUSTER_DEBUG_RESET_STATUS;
+ data = readl_relaxed(sysctrl + \
+ SC_CPU_RESET_STATUS(cluster));
+ } while (data & mask);
+ }
+
+ data = CORE_RESET_BIT(cpu) | NEON_RESET_BIT(cpu) | \
+ CORE_DEBUG_RESET_BIT(cpu);
+ writel_relaxed(data, sysctrl + SC_CPU_RESET_DREQ(cluster));
+out:
+ hip04_cpu_table[cluster][cpu]++;
+ spin_unlock_irq(&boot_lock);
+
+ return 0;
+}
+
+static void hip04_mcpm_power_down(void)
+{
+ unsigned int mpidr, cpu, cluster;
+ bool skip_wfi = false;
+
+ mpidr = read_cpuid_mpidr();
+ cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+ cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+
+ __mcpm_cpu_going_down(cpu, cluster);
+
+ spin_lock(&boot_lock);
+ BUG_ON(__mcpm_cluster_state(cluster) != CLUSTER_UP);
+ hip04_cpu_table[cluster][cpu]--;
+ if (hip04_cpu_table[cluster][cpu] == 1) {
+ /* A power_up request went ahead of us. */
+ skip_wfi = true;
+ } else if (hip04_cpu_table[cluster][cpu] > 1) {
+ pr_err("Cluster %d CPU%d boots multiple times\n", cluster, cpu);
+ BUG();
+ }
+ spin_unlock(&boot_lock);
+
+ v7_exit_coherency_flush(louis);
+
+ __mcpm_cpu_down(cpu, cluster);
+
+ if (!skip_wfi)
+ wfi();
+}
+
+static int hip04_mcpm_wait_for_powerdown(unsigned int cpu, unsigned int cluster)
+{
+ unsigned int data, tries, count;
+
+ BUG_ON(cluster >= HIP04_MAX_CLUSTERS ||
+ cpu >= HIP04_MAX_CPUS_PER_CLUSTER);
+
+ count = TIMEOUT_MSEC / POLL_MSEC;
+ spin_lock(&boot_lock);
+ for (tries = 0; tries < count; tries++) {
+ data = readl_relaxed(sysctrl + SC_CPU_RESET_STATUS(cluster));
+ if (!(data & CORE_WFI_STATUS(cpu))) {
+ msleep(POLL_MSEC);
+ continue;
+ }
+ }
+ if (tries >= count)
+ goto err;
+ data = CORE_RESET_BIT(cpu) | NEON_RESET_BIT(cpu) | \
+ CORE_DEBUG_RESET_BIT(cpu);
+ writel_relaxed(data, sysctrl + SC_CPU_RESET_REQ(cluster));
+ for (tries = 0; tries < count; tries++) {
+ data = readl_relaxed(sysctrl + SC_CPU_RESET_STATUS(cluster));
+ if (!(data & CORE_RESET_STATUS(cpu))) {
+ msleep(POLL_MSEC);
+ continue;
+ }
+ }
+ if (tries >= count)
+ goto err;
+ if (hip04_cluster_down(cluster))
+ hip04_set_snoop_filter(cluster, 0);
+ spin_unlock(&boot_lock);
+ return 0;
+err:
+ spin_unlock(&boot_lock);
+ return -ETIMEDOUT;
+}
+
+static void hip04_mcpm_powered_up(void)
+{
+ if (!relocation)
+ return;
+ spin_lock(&boot_lock);
+ writel_relaxed(0, relocation);
+ writel_relaxed(0, relocation + 4);
+ writel_relaxed(0, relocation + 8);
+ writel_relaxed(0, relocation + 12);
+ spin_unlock(&boot_lock);
+}
+
+static void __naked hip04_mcpm_power_up_setup(unsigned int affinity_level)
+{
+ asm volatile (" \n"
+" cmp r0, #0 \n"
+" bxeq lr \n"
+ /* calculate fabric phys address */
+" adr r2, 2f \n"
+" ldmia r2, {r1, r3} \n"
+" sub r0, r2, r1 \n"
+" ldr r2, [r0, r3] \n"
+ /* get cluster id from MPIDR */
+" mrc p15, 0, r0, c0, c0, 5 \n"
+" ubfx r1, r0, #8, #8 \n"
+ /* 1 << cluster id */
+" mov r0, #1 \n"
+" mov r3, r0, lsl r1 \n"
+" ldr r0, [r2, #"__stringify(FAB_SF_MODE)"] \n"
+" tst r0, r3 \n"
+" bxne lr \n"
+" orr r1, r0, r3 \n"
+" str r1, [r2, #"__stringify(FAB_SF_MODE)"] \n"
+"1: ldr r0, [r2, #"__stringify(FAB_SF_MODE)"] \n"
+" tst r0, r3 \n"
+" beq 1b \n"
+" bx lr \n"
+
+" .align 2 \n"
+"2: .word . \n"
+" .word fabric_phys_addr \n"
+ );
+}
+
+static const struct mcpm_platform_ops hip04_mcpm_ops = {
+ .power_up = hip04_mcpm_power_up,
+ .power_down = hip04_mcpm_power_down,
+ .wait_for_powerdown = hip04_mcpm_wait_for_powerdown,
+ .powered_up = hip04_mcpm_powered_up,
+};
+
+static bool __init hip04_cpu_table_init(void)
+{
+ unsigned int mpidr, cpu, cluster;
+
+ mpidr = read_cpuid_mpidr();
+ cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+ cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+
+ if (cluster >= HIP04_MAX_CLUSTERS ||
+ cpu >= HIP04_MAX_CPUS_PER_CLUSTER) {
+ pr_err("%s: boot CPU is out of bound!\n", __func__);
+ return false;
+ }
+ hip04_set_snoop_filter(0, 1);
+ hip04_cpu_table[cluster][cpu] = 1;
+ return true;
+}
+
+static int __init hip04_mcpm_init(void)
+{
+ struct device_node *np, *np_fab;
+ struct resource fab_res;
+ int ret = -ENODEV;
+
+ if (!hip04_boot.bootwrapper_phys || !hip04_boot.relocation_entry) {
+ pr_err("fail to find bootwrapper or relocation param\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ np = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
+ if (!np)
+ goto err;
+ np_fab = of_find_compatible_node(NULL, NULL, "hisilicon,hip04-fabric");
+ if (!np_fab)
+ goto err;
+
+ relocation = ioremap(hip04_boot.relocation_entry,
+ hip04_boot.relocation_size);
+ if (!relocation) {
+ pr_err("failed to map relocation space\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+ sysctrl = of_iomap(np, 0);
+ if (!sysctrl) {
+ pr_err("failed to get sysctrl base\n");
+ ret = -ENOMEM;
+ goto err_sysctrl;
+ }
+ ret = of_address_to_resource(np_fab, 0, &fab_res);
+ if (ret) {
+ pr_err("failed to get fabric base phys\n");
+ goto err_fabric;
+ }
+ fabric_phys_addr = fab_res.start;
+ sync_cache_w(&fabric_phys_addr);
+ fabric = of_iomap(np_fab, 0);
+ if (!fabric) {
+ pr_err("failed to get fabric base\n");
+ ret = -ENOMEM;
+ goto err_fabric;
+ }
+
+ if (!hip04_cpu_table_init())
+ return -EINVAL;
+ ret = mcpm_platform_register(&hip04_mcpm_ops);
+ if (!ret) {
+ mcpm_sync_init(hip04_mcpm_power_up_setup);
+ pr_info("HiP04 MCPM initialized\n");
+ }
+ mcpm_smp_set_ops();
+ return ret;
+err_fabric:
+ iounmap(sysctrl);
+err_sysctrl:
+ iounmap(relocation);
+err:
+ return ret;
+}
+early_initcall(hip04_mcpm_init);
--
1.9.1
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