MIPS: Loongson-3: Add CPU Hwmon platform driver
authorHuacai Chen <chenhc@lemote.com>
Sun, 29 Mar 2015 02:54:09 +0000 (10:54 +0800)
committerRalf Baechle <ralf@linux-mips.org>
Wed, 1 Apr 2015 15:22:17 +0000 (17:22 +0200)
This add CPU Hwmon (temperature sensor) platform driver for Loongson-3.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/9617/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/include/asm/mach-loongson/loongson.h
arch/mips/loongson/common/env.c
drivers/platform/Kconfig
drivers/platform/Makefile
drivers/platform/mips/Kconfig [new file with mode: 0644]
drivers/platform/mips/Makefile [new file with mode: 0644]
drivers/platform/mips/cpu_hwmon.c [new file with mode: 0644]

index 5459ac09679f224083288b0583b59cd2879c01f9..9783103fd6f662d8c5e3b55bcbabbe63f4b12e5e 100644 (file)
@@ -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]))
index 045ea3d47c87d7f3d0d3c801822ed6aa9e829b08..22f04ca2ff3e58cd9ddddfa1ded6d84e5147efa0 100644 (file)
@@ -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;
index 09fde58b12e0fa1e2446d56218fa644f32aeeef1..0adccbf5c83f116bd698c392c47b75a9197f892f 100644 (file)
@@ -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
index 3656b7b17b99ee8ecc806fd21f3fa493873ff122..ca2692510733df7bc6fa9ffc281598376cb2f960 100644 (file)
@@ -3,6 +3,7 @@
 #
 
 obj-$(CONFIG_X86)              += x86/
+obj-$(CONFIG_MIPS)             += mips/
 obj-$(CONFIG_OLPC)             += olpc/
 obj-$(CONFIG_GOLDFISH)         += goldfish/
 obj-$(CONFIG_CHROME_PLATFORMS) += chrome/
diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig
new file mode 100644 (file)
index 0000000..b3ae30a
--- /dev/null
@@ -0,0 +1,26 @@
+#
+# MIPS Platform Specific Drivers
+#
+
+menuconfig MIPS_PLATFORM_DEVICES
+       bool "MIPS Platform Specific Device Drivers"
+       default y
+       help
+         Say Y here to get to see options for device drivers of various
+         MIPS platforms, including vendor-specific netbook/laptop/desktop
+         extension and hardware monitor drivers. This option itself does
+         not add any kernel code.
+
+         If you say N, all options in this submenu will be skipped and disabled.
+
+if MIPS_PLATFORM_DEVICES
+
+config CPU_HWMON
+       tristate "Loongson CPU HWMon Driver"
+       depends on LOONGSON_MACH3X
+       select HWMON
+       default y
+       help
+         Loongson-3A/3B CPU Hwmon (temperature sensor) driver.
+
+endif # MIPS_PLATFORM_DEVICES
diff --git a/drivers/platform/mips/Makefile b/drivers/platform/mips/Makefile
new file mode 100644 (file)
index 0000000..8dfd039
--- /dev/null
@@ -0,0 +1 @@
+obj-$(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 (file)
index 0000000..0f6c63e
--- /dev/null
@@ -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@lemote.com>");
+MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
+MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
+MODULE_LICENSE("GPL");