This add CPU Hwmon (temperature sensor) platform driver for Loongson-3.
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
---
arch/mips/include/asm/mach-loongson/loongson.h | 4 +
arch/mips/loongson/common/env.c | 9 +
drivers/platform/Kconfig | 3 +
drivers/platform/Makefile | 1 +
drivers/platform/mips/Kconfig | 26 +++
drivers/platform/mips/Makefile | 1 +
drivers/platform/mips/cpu_hwmon.c | 207 ++++++++++++++++++++++++
7 files changed, 251 insertions(+), 0 deletions(-)
create mode 100644 drivers/platform/mips/Kconfig
create mode 100644 drivers/platform/mips/Makefile
create mode 100644 drivers/platform/mips/cpu_hwmon.c
diff --git a/arch/mips/include/asm/mach-loongson/loongson.h b/arch/mips/include/asm/mach-loongson/loongson.h
index 5459ac0..9783103 100644
--- a/arch/mips/include/asm/mach-loongson/loongson.h
+++ b/arch/mips/include/asm/mach-loongson/loongson.h
@@ -255,6 +255,10 @@ static inline void do_perfcnt_IRQ(void)
extern u64 loongson_chipcfg[MAX_PACKAGES];
#define LOONGSON_CHIPCFG(id) (*(volatile u32 *)(loongson_chipcfg[id]))
+/* Chip Temperature registor of each physical cpu package, PRid >= Loongson-3A */
+extern u64 loongson_chiptemp[MAX_PACKAGES];
+#define LOONGSON_CHIPTEMP(id) (*(volatile u32 *)(loongson_chiptemp[id]))
+
/* Freq Control register of each physical cpu package, PRid >= Loongson-3B */
extern u64 loongson_freqctrl[MAX_PACKAGES];
#define LOONGSON_FREQCTRL(id) (*(volatile u32 *)(loongson_freqctrl[id]))
diff --git a/arch/mips/loongson/common/env.c b/arch/mips/loongson/common/env.c
index 045ea3d..22f04ca 100644
--- a/arch/mips/loongson/common/env.c
+++ b/arch/mips/loongson/common/env.c
@@ -29,6 +29,7 @@ struct efi_memory_map_loongson *loongson_memmap;
struct loongson_system_configuration loongson_sysconf;
u64 loongson_chipcfg[MAX_PACKAGES] = {0xffffffffbfc00180};
+u64 loongson_chiptemp[MAX_PACKAGES];
u64 loongson_freqctrl[MAX_PACKAGES];
unsigned long long smp_group[4];
@@ -97,6 +98,10 @@ void __init prom_init_env(void)
loongson_chipcfg[1] = 0x900010001fe00180;
loongson_chipcfg[2] = 0x900020001fe00180;
loongson_chipcfg[3] = 0x900030001fe00180;
+ loongson_chiptemp[0] = 0x900000001fe0019c;
+ loongson_chiptemp[1] = 0x900010001fe0019c;
+ loongson_chiptemp[2] = 0x900020001fe0019c;
+ loongson_chiptemp[3] = 0x900030001fe0019c;
loongson_sysconf.ht_control_base = 0x90000EFDFB000000;
loongson_sysconf.workarounds = WORKAROUND_CPUFREQ;
} else if (ecpu->cputype == Loongson_3B) {
@@ -110,6 +115,10 @@ void __init prom_init_env(void)
loongson_chipcfg[1] = 0x900020001fe00180;
loongson_chipcfg[2] = 0x900040001fe00180;
loongson_chipcfg[3] = 0x900060001fe00180;
+ loongson_chiptemp[0] = 0x900000001fe0019c;
+ loongson_chiptemp[1] = 0x900020001fe0019c;
+ loongson_chiptemp[2] = 0x900040001fe0019c;
+ loongson_chiptemp[3] = 0x900060001fe0019c;
loongson_freqctrl[0] = 0x900000001fe001d0;
loongson_freqctrl[1] = 0x900020001fe001d0;
loongson_freqctrl[2] = 0x900040001fe001d0;
diff --git a/drivers/platform/Kconfig b/drivers/platform/Kconfig
index 09fde58..0adccbf 100644
--- a/drivers/platform/Kconfig
+++ b/drivers/platform/Kconfig
@@ -1,6 +1,9 @@
if X86
source "drivers/platform/x86/Kconfig"
endif
+if MIPS
+source "drivers/platform/mips/Kconfig"
+endif
if GOLDFISH
source "drivers/platform/goldfish/Kconfig"
endif
diff --git a/drivers/platform/Makefile b/drivers/platform/Makefile
index 3656b7b..ca26925 100644
--- a/drivers/platform/Makefile
+++ b/drivers/platform/Makefile
@@ -3,6 +3,7 @@
#
obj-$(CONFIG_X86) += x86/
+obj-$(CONFIG_MIPS) += mips/
obj-$(CONFIG_OLPC) += olpc/
obj-$(CONFIG_GOLDFISH) += goldfish/
obj-$(CONFIG_CHROME_PLATFORMS) += chrome/
diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig
new file mode 100644
index 0000000..b3ae30a
--- /dev/null
+++ b/drivers/platform/mips/Kconfig
@@ -0,0 +1,26 @@
+#
+# MIPS Platform Specific Drivers
+#
+
+menuconfig MIPS_PLATFORM_DEVICES
+ bool "MIPS Platform Specific Device Drivers"
+ default y
+ help
+ Say Y here to get to see options for device drivers of various
+ MIPS platforms, including vendor-specific netbook/laptop/desktop
+ extension and hardware monitor drivers. This option itself does
+ not add any kernel code.
+
+ If you say N, all options in this submenu will be skipped and disabled.
+
+if MIPS_PLATFORM_DEVICES
+
+config CPU_HWMON
+ tristate "Loongson CPU HWMon Driver"
+ depends on LOONGSON_MACH3X
+ select HWMON
+ default y
+ help
+ Loongson-3A/3B CPU Hwmon (temperature sensor) driver.
+
+endif # MIPS_PLATFORM_DEVICES
diff --git a/drivers/platform/mips/Makefile b/drivers/platform/mips/Makefile
new file mode 100644
index 0000000..8dfd039
--- /dev/null
+++ b/drivers/platform/mips/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_CPU_HWMON) += cpu_hwmon.o
diff --git a/drivers/platform/mips/cpu_hwmon.c b/drivers/platform/mips/cpu_hwmon.c
new file mode 100644
index 0000000..0f6c63e
--- /dev/null
+++ b/drivers/platform/mips/cpu_hwmon.c
@@ -0,0 +1,207 @@
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/jiffies.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+
+#include <loongson.h>
+#include <boot_param.h>
+#include <loongson_hwmon.h>
+
+/*
+ * Loongson-3 series cpu has two sensors inside,
+ * each of them from 0 to 255,
+ * if more than 127, that is dangerous.
+ * here only provide sensor1 data, because it always hot than sensor0
+ */
+int loongson3_cpu_temp(int cpu)
+{
+ u32 reg;
+
+ reg = LOONGSON_CHIPTEMP(cpu);
+ if (loongson_sysconf.cputype == Loongson_3A)
+ reg = (reg >> 8) & 0xff;
+ else if (loongson_sysconf.cputype == Loongson_3B)
+ reg = ((reg >> 8) & 0xff) - 100;
+
+ return (int)reg * 1000;
+}
+
+static struct device *cpu_hwmon_dev;
+
+static ssize_t get_hwmon_name(struct device *dev,
+ struct device_attribute *attr, char *buf);
+static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
+
+static struct attribute *cpu_hwmon_attributes[] = {
+ &sensor_dev_attr_name.dev_attr.attr,
+ NULL
+};
+
+/* Hwmon device attribute group */
+static struct attribute_group cpu_hwmon_attribute_group = {
+ .attrs = cpu_hwmon_attributes,
+};
+
+/* Hwmon device get name */
+static ssize_t get_hwmon_name(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "cpu-hwmon\n");
+}
+
+static ssize_t get_cpu0_temp(struct device *dev,
+ struct device_attribute *attr, char *buf);
+static ssize_t get_cpu1_temp(struct device *dev,
+ struct device_attribute *attr, char *buf);
+static ssize_t cpu0_temp_label(struct device *dev,
+ struct device_attribute *attr, char *buf);
+static ssize_t cpu1_temp_label(struct device *dev,
+ struct device_attribute *attr, char *buf);
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu0_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu0_temp_label, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu1_temp, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu1_temp_label, NULL, 2);
+
+static const struct attribute *hwmon_cputemp1[] = {
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_label.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute *hwmon_cputemp2[] = {
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_label.dev_attr.attr,
+ NULL
+};
+
+static ssize_t cpu0_temp_label(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "CPU 0 Temprature\n");
+}
+
+static ssize_t cpu1_temp_label(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "CPU 1 Temprature\n");
+}
+
+static ssize_t get_cpu0_temp(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int value = loongson3_cpu_temp(0);
+ return sprintf(buf, "%d\n", value);
+}
+
+static ssize_t get_cpu1_temp(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int value = loongson3_cpu_temp(1);
+ return sprintf(buf, "%d\n", value);
+}
+
+static int create_sysfs_cputemp_files(struct kobject *kobj)
+{
+ int ret;
+
+ ret = sysfs_create_files(kobj, hwmon_cputemp1);
+ if (ret)
+ goto sysfs_create_temp1_fail;
+
+ if (loongson_sysconf.nr_cpus <= loongson_sysconf.cores_per_package)
+ return 0;
+
+ ret = sysfs_create_files(kobj, hwmon_cputemp2);
+ if (ret)
+ goto sysfs_create_temp2_fail;
+
+ return 0;
+
+sysfs_create_temp2_fail:
+ sysfs_remove_files(kobj, hwmon_cputemp1);
+
+sysfs_create_temp1_fail:
+ return -1;
+}
+
+static void remove_sysfs_cputemp_files(struct kobject *kobj)
+{
+ sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp1);
+
+ if (loongson_sysconf.nr_cpus > loongson_sysconf.cores_per_package)
+ sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp2);
+}
+
+#define CPU_THERMAL_THRESHOLD 90000
+static struct delayed_work thermal_work;
+
+static void do_thermal_timer(struct work_struct *work)
+{
+ int value = loongson3_cpu_temp(0);
+ if (value <= CPU_THERMAL_THRESHOLD)
+ schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
+ else
+ orderly_poweroff(true);
+}
+
+static int __init loongson_hwmon_init(void)
+{
+ int ret;
+
+ pr_info("Loongson Hwmon Enter...\n");
+
+ cpu_hwmon_dev = hwmon_device_register(NULL);
+ if (IS_ERR(cpu_hwmon_dev)) {
+ ret = -ENOMEM;
+ pr_err("hwmon_device_register fail!\n");
+ goto fail_hwmon_device_register;
+ }
+
+ ret = sysfs_create_group(&cpu_hwmon_dev->kobj,
+ &cpu_hwmon_attribute_group);
+ if (ret) {
+ pr_err("fail to create loongson hwmon!\n");
+ goto fail_sysfs_create_group_hwmon;
+ }
+
+ ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
+ if (ret) {
+ pr_err("fail to create cpu temprature interface!\n");
+ goto fail_create_sysfs_cputemp_files;
+ }
+
+ INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
+ schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));
+
+ return ret;
+
+fail_create_sysfs_cputemp_files:
+ sysfs_remove_group(&cpu_hwmon_dev->kobj,
+ &cpu_hwmon_attribute_group);
+
+fail_sysfs_create_group_hwmon:
+ hwmon_device_unregister(cpu_hwmon_dev);
+
+fail_hwmon_device_register:
+ return ret;
+}
+
+static void __exit loongson_hwmon_exit(void)
+{
+ cancel_delayed_work_sync(&thermal_work);
+ remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
+ sysfs_remove_group(&cpu_hwmon_dev->kobj,
+ &cpu_hwmon_attribute_group);
+ hwmon_device_unregister(cpu_hwmon_dev);
+}
+
+module_init(loongson_hwmon_init);
+module_exit(loongson_hwmon_exit);
+
+MODULE_AUTHOR("Yu Xiang <xiangy@xxxxxxxxxx>");
+MODULE_AUTHOR("Huacai Chen <chenhc@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
+MODULE_LICENSE("GPL");
--
1.7.7.3
