diff options
Diffstat (limited to 'arch/powerpc/platforms/cell/cbe_thermal.c')
| -rw-r--r-- | arch/powerpc/platforms/cell/cbe_thermal.c | 386 |
1 files changed, 0 insertions, 386 deletions
diff --git a/arch/powerpc/platforms/cell/cbe_thermal.c b/arch/powerpc/platforms/cell/cbe_thermal.c deleted file mode 100644 index 2f45428e32c8..000000000000 --- a/arch/powerpc/platforms/cell/cbe_thermal.c +++ /dev/null @@ -1,386 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * thermal support for the cell processor - * - * This module adds some sysfs attributes to cpu and spu nodes. - * Base for measurements are the digital thermal sensors (DTS) - * located on the chip. - * The accuracy is 2 degrees, starting from 65 up to 125 degrees celsius - * The attributes can be found under - * /sys/devices/system/cpu/cpuX/thermal - * /sys/devices/system/spu/spuX/thermal - * - * The following attributes are added for each node: - * temperature: - * contains the current temperature measured by the DTS - * throttle_begin: - * throttling begins when temperature is greater or equal to - * throttle_begin. Setting this value to 125 prevents throttling. - * throttle_end: - * throttling is being ceased, if the temperature is lower than - * throttle_end. Due to a delay between applying throttling and - * a reduced temperature this value should be less than throttle_begin. - * A value equal to throttle_begin provides only a very little hysteresis. - * throttle_full_stop: - * If the temperatrue is greater or equal to throttle_full_stop, - * full throttling is applied to the cpu or spu. This value should be - * greater than throttle_begin and throttle_end. Setting this value to - * 65 prevents the unit from running code at all. - * - * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 - * - * Author: Christian Krafft <krafft@de.ibm.com> - */ - -#include <linux/module.h> -#include <linux/device.h> -#include <linux/kernel.h> -#include <linux/cpu.h> -#include <linux/stringify.h> -#include <asm/spu.h> -#include <asm/io.h> -#include <asm/cell-regs.h> - -#include "spu_priv1_mmio.h" - -#define TEMP_MIN 65 -#define TEMP_MAX 125 - -#define DEVICE_PREFIX_ATTR(_prefix,_name,_mode) \ -struct device_attribute attr_ ## _prefix ## _ ## _name = { \ - .attr = { .name = __stringify(_name), .mode = _mode }, \ - .show = _prefix ## _show_ ## _name, \ - .store = _prefix ## _store_ ## _name, \ -}; - -static inline u8 reg_to_temp(u8 reg_value) -{ - return ((reg_value & 0x3f) << 1) + TEMP_MIN; -} - -static inline u8 temp_to_reg(u8 temp) -{ - return ((temp - TEMP_MIN) >> 1) & 0x3f; -} - -static struct cbe_pmd_regs __iomem *get_pmd_regs(struct device *dev) -{ - struct spu *spu; - - spu = container_of(dev, struct spu, dev); - - return cbe_get_pmd_regs(spu_devnode(spu)); -} - -/* returns the value for a given spu in a given register */ -static u8 spu_read_register_value(struct device *dev, union spe_reg __iomem *reg) -{ - union spe_reg value; - struct spu *spu; - - spu = container_of(dev, struct spu, dev); - value.val = in_be64(®->val); - - return value.spe[spu->spe_id]; -} - -static ssize_t spu_show_temp(struct device *dev, struct device_attribute *attr, - char *buf) -{ - u8 value; - struct cbe_pmd_regs __iomem *pmd_regs; - - pmd_regs = get_pmd_regs(dev); - - value = spu_read_register_value(dev, &pmd_regs->ts_ctsr1); - - return sprintf(buf, "%d\n", reg_to_temp(value)); -} - -static ssize_t show_throttle(struct cbe_pmd_regs __iomem *pmd_regs, char *buf, int pos) -{ - u64 value; - - value = in_be64(&pmd_regs->tm_tpr.val); - /* access the corresponding byte */ - value >>= pos; - value &= 0x3F; - - return sprintf(buf, "%d\n", reg_to_temp(value)); -} - -static ssize_t store_throttle(struct cbe_pmd_regs __iomem *pmd_regs, const char *buf, size_t size, int pos) -{ - u64 reg_value; - unsigned int temp; - u64 new_value; - int ret; - - ret = sscanf(buf, "%u", &temp); - - if (ret != 1 || temp < TEMP_MIN || temp > TEMP_MAX) - return -EINVAL; - - new_value = temp_to_reg(temp); - - reg_value = in_be64(&pmd_regs->tm_tpr.val); - - /* zero out bits for new value */ - reg_value &= ~(0xffull << pos); - /* set bits to new value */ - reg_value |= new_value << pos; - - out_be64(&pmd_regs->tm_tpr.val, reg_value); - return size; -} - -static ssize_t spu_show_throttle_end(struct device *dev, - struct device_attribute *attr, char *buf) -{ - return show_throttle(get_pmd_regs(dev), buf, 0); -} - -static ssize_t spu_show_throttle_begin(struct device *dev, - struct device_attribute *attr, char *buf) -{ - return show_throttle(get_pmd_regs(dev), buf, 8); -} - -static ssize_t spu_show_throttle_full_stop(struct device *dev, - struct device_attribute *attr, char *buf) -{ - return show_throttle(get_pmd_regs(dev), buf, 16); -} - -static ssize_t spu_store_throttle_end(struct device *dev, - struct device_attribute *attr, const char *buf, size_t size) -{ - return store_throttle(get_pmd_regs(dev), buf, size, 0); -} - -static ssize_t spu_store_throttle_begin(struct device *dev, - struct device_attribute *attr, const char *buf, size_t size) -{ - return store_throttle(get_pmd_regs(dev), buf, size, 8); -} - -static ssize_t spu_store_throttle_full_stop(struct device *dev, - struct device_attribute *attr, const char *buf, size_t size) -{ - return store_throttle(get_pmd_regs(dev), buf, size, 16); -} - -static ssize_t ppe_show_temp(struct device *dev, char *buf, int pos) -{ - struct cbe_pmd_regs __iomem *pmd_regs; - u64 value; - - pmd_regs = cbe_get_cpu_pmd_regs(dev->id); - value = in_be64(&pmd_regs->ts_ctsr2); - - value = (value >> pos) & 0x3f; - - return sprintf(buf, "%d\n", reg_to_temp(value)); -} - - -/* shows the temperature of the DTS on the PPE, - * located near the linear thermal sensor */ -static ssize_t ppe_show_temp0(struct device *dev, - struct device_attribute *attr, char *buf) -{ - return ppe_show_temp(dev, buf, 32); -} - -/* shows the temperature of the second DTS on the PPE */ -static ssize_t ppe_show_temp1(struct device *dev, - struct device_attribute *attr, char *buf) -{ - return ppe_show_temp(dev, buf, 0); -} - -static ssize_t ppe_show_throttle_end(struct device *dev, - struct device_attribute *attr, char *buf) -{ - return show_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, 32); -} - -static ssize_t ppe_show_throttle_begin(struct device *dev, - struct device_attribute *attr, char *buf) -{ - return show_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, 40); -} - -static ssize_t ppe_show_throttle_full_stop(struct device *dev, - struct device_attribute *attr, char *buf) -{ - return show_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, 48); -} - -static ssize_t ppe_store_throttle_end(struct device *dev, - struct device_attribute *attr, const char *buf, size_t size) -{ - return store_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, size, 32); -} - -static ssize_t ppe_store_throttle_begin(struct device *dev, - struct device_attribute *attr, const char *buf, size_t size) -{ - return store_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, size, 40); -} - -static ssize_t ppe_store_throttle_full_stop(struct device *dev, - struct device_attribute *attr, const char *buf, size_t size) -{ - return store_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, size, 48); -} - - -static struct device_attribute attr_spu_temperature = { - .attr = {.name = "temperature", .mode = 0400 }, - .show = spu_show_temp, -}; - -static DEVICE_PREFIX_ATTR(spu, throttle_end, 0600); -static DEVICE_PREFIX_ATTR(spu, throttle_begin, 0600); -static DEVICE_PREFIX_ATTR(spu, throttle_full_stop, 0600); - - -static struct attribute *spu_attributes[] = { - &attr_spu_temperature.attr, - &attr_spu_throttle_end.attr, - &attr_spu_throttle_begin.attr, - &attr_spu_throttle_full_stop.attr, - NULL, -}; - -static const struct attribute_group spu_attribute_group = { - .name = "thermal", - .attrs = spu_attributes, -}; - -static struct device_attribute attr_ppe_temperature0 = { - .attr = {.name = "temperature0", .mode = 0400 }, - .show = ppe_show_temp0, -}; - -static struct device_attribute attr_ppe_temperature1 = { - .attr = {.name = "temperature1", .mode = 0400 }, - .show = ppe_show_temp1, -}; - -static DEVICE_PREFIX_ATTR(ppe, throttle_end, 0600); -static DEVICE_PREFIX_ATTR(ppe, throttle_begin, 0600); -static DEVICE_PREFIX_ATTR(ppe, throttle_full_stop, 0600); - -static struct attribute *ppe_attributes[] = { - &attr_ppe_temperature0.attr, - &attr_ppe_temperature1.attr, - &attr_ppe_throttle_end.attr, - &attr_ppe_throttle_begin.attr, - &attr_ppe_throttle_full_stop.attr, - NULL, -}; - -static struct attribute_group ppe_attribute_group = { - .name = "thermal", - .attrs = ppe_attributes, -}; - -/* - * initialize throttling with default values - */ -static int __init init_default_values(void) -{ - int cpu; - struct cbe_pmd_regs __iomem *pmd_regs; - struct device *dev; - union ppe_spe_reg tpr; - union spe_reg str1; - u64 str2; - union spe_reg cr1; - u64 cr2; - - /* TPR defaults */ - /* ppe - * 1F - no full stop - * 08 - dynamic throttling starts if over 80 degrees - * 03 - dynamic throttling ceases if below 70 degrees */ - tpr.ppe = 0x1F0803; - /* spe - * 10 - full stopped when over 96 degrees - * 08 - dynamic throttling starts if over 80 degrees - * 03 - dynamic throttling ceases if below 70 degrees - */ - tpr.spe = 0x100803; - - /* STR defaults */ - /* str1 - * 10 - stop 16 of 32 cycles - */ - str1.val = 0x1010101010101010ull; - /* str2 - * 10 - stop 16 of 32 cycles - */ - str2 = 0x10; - - /* CR defaults */ - /* cr1 - * 4 - normal operation - */ - cr1.val = 0x0404040404040404ull; - /* cr2 - * 4 - normal operation - */ - cr2 = 0x04; - - for_each_possible_cpu (cpu) { - pr_debug("processing cpu %d\n", cpu); - dev = get_cpu_device(cpu); - - if (!dev) { - pr_info("invalid dev pointer for cbe_thermal\n"); - return -EINVAL; - } - - pmd_regs = cbe_get_cpu_pmd_regs(dev->id); - - if (!pmd_regs) { - pr_info("invalid CBE regs pointer for cbe_thermal\n"); - return -EINVAL; - } - - out_be64(&pmd_regs->tm_str2, str2); - out_be64(&pmd_regs->tm_str1.val, str1.val); - out_be64(&pmd_regs->tm_tpr.val, tpr.val); - out_be64(&pmd_regs->tm_cr1.val, cr1.val); - out_be64(&pmd_regs->tm_cr2, cr2); - } - - return 0; -} - - -static int __init thermal_init(void) -{ - int rc = init_default_values(); - - if (rc == 0) { - spu_add_dev_attr_group(&spu_attribute_group); - cpu_add_dev_attr_group(&ppe_attribute_group); - } - - return rc; -} -module_init(thermal_init); - -static void __exit thermal_exit(void) -{ - spu_remove_dev_attr_group(&spu_attribute_group); - cpu_remove_dev_attr_group(&ppe_attribute_group); -} -module_exit(thermal_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>"); - |