[mirror_ubuntu-jammy-kernel.git] / arch / powerpc / platforms / cell / cbe_thermal.c

/*
 * 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>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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/prom.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(&reg->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 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>");
Commit	Line	Data
b3d7dc19 CK	1	/*
	2	* thermal support for the cell processor
	3	*
5f7bdaee CK	4	* This module adds some sysfs attributes to cpu and spu nodes.
	5	* Base for measurements are the digital thermal sensors (DTS)
	6	* located on the chip.
	7	* The accuracy is 2 degrees, starting from 65 up to 125 degrees celsius
	8	* The attributes can be found under
	9	* /sys/devices/system/cpu/cpuX/thermal
	10	* /sys/devices/system/spu/spuX/thermal
	11	*
	12	* The following attributes are added for each node:
	13	* temperature:
	14	* contains the current temperature measured by the DTS
	15	* throttle_begin:
	16	* throttling begins when temperature is greater or equal to
	17	* throttle_begin. Setting this value to 125 prevents throttling.
	18	* throttle_end:
	19	* throttling is being ceased, if the temperature is lower than
	20	* throttle_end. Due to a delay between applying throttling and
	21	* a reduced temperature this value should be less than throttle_begin.
	22	* A value equal to throttle_begin provides only a very little hysteresis.
	23	* throttle_full_stop:
	24	* If the temperatrue is greater or equal to throttle_full_stop,
	25	* full throttling is applied to the cpu or spu. This value should be
	26	* greater than throttle_begin and throttle_end. Setting this value to
	27	* 65 prevents the unit from running code at all.
	28	*
b3d7dc19 CK	29	* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
	30	*
	31	* Author: Christian Krafft <krafft@de.ibm.com>
	32	*
	33	* This program is free software; you can redistribute it and/or modify
	34	* it under the terms of the GNU General Public License as published by
	35	* the Free Software Foundation; either version 2, or (at your option)
	36	* any later version.
	37	*
	38	* This program is distributed in the hope that it will be useful,
	39	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	40	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	41	* GNU General Public License for more details.
	42	*
	43	* You should have received a copy of the GNU General Public License
	44	* along with this program; if not, write to the Free Software
	45	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	46	*/
	47
	48	#include <linux/module.h>
8a25a2fd	49	#include <linux/device.h>
b3d7dc19 CK	50	#include <linux/kernel.h>
b3d7dc19 CK	51	#include <linux/cpu.h>
5c35a02c	52	#include <linux/stringify.h>
b3d7dc19 CK	53	#include <asm/spu.h>
	54	#include <asm/io.h>
	55	#include <asm/prom.h>
eef686a0	56	#include <asm/cell-regs.h>
b3d7dc19	57
e28b0031	58	#include "spu_priv1_mmio.h"
b3d7dc19	59
5f7bdaee CK	60	#define TEMP_MIN 65
	61	#define TEMP_MAX 125
	62
8a25a2fd KS	63	#define DEVICE_PREFIX_ATTR(_prefix,_name,_mode) \
8a25a2fd KS	64	struct device_attribute attr_ ## _prefix ## _ ## _name = { \
5f7bdaee CK	65	.attr = { .name = __stringify(_name), .mode = _mode }, \
	66	.show = _prefix ## _show_ ## _name, \
	67	.store = _prefix ## _store_ ## _name, \
	68	};
	69
24d560d7 CK	70	static inline u8 reg_to_temp(u8 reg_value)
24d560d7 CK	71	{
5f7bdaee CK	72	return ((reg_value & 0x3f) << 1) + TEMP_MIN;
	73	}
	74
	75	static inline u8 temp_to_reg(u8 temp)
	76	{
	77	return ((temp - TEMP_MIN) >> 1) & 0x3f;
24d560d7 CK	78	}
24d560d7 CK	79
8a25a2fd	80	static struct cbe_pmd_regs __iomem get_pmd_regs(struct device dev)
b3d7dc19 CK	81	{
	82	struct spu *spu;
	83
8a25a2fd	84	spu = container_of(dev, struct spu, dev);
b3d7dc19	85
e28b0031	86	return cbe_get_pmd_regs(spu_devnode(spu));
b3d7dc19 CK	87	}
	88
	89	/* returns the value for a given spu in a given register */
8a25a2fd	90	static u8 spu_read_register_value(struct device dev, union spe_reg __iomem reg)
b3d7dc19	91	{
b3d7dc19 CK	92	union spe_reg value;
	93	struct spu *spu;
	94
8a25a2fd	95	spu = container_of(dev, struct spu, dev);
b3d7dc19 CK	96	value.val = in_be64(&reg->val);
b3d7dc19 CK	97
fa7f374b	98	return value.spe[spu->spe_id];
b3d7dc19 CK	99	}
b3d7dc19 CK	100
8a25a2fd	101	static ssize_t spu_show_temp(struct device dev, struct device_attribute attr,
4a0b2b4d	102	char *buf)
b3d7dc19	103	{
24d560d7	104	u8 value;
b3d7dc19 CK	105	struct cbe_pmd_regs __iomem *pmd_regs;
b3d7dc19 CK	106
8a25a2fd	107	pmd_regs = get_pmd_regs(dev);
b3d7dc19	108
8a25a2fd	109	value = spu_read_register_value(dev, &pmd_regs->ts_ctsr1);
24d560d7 CK	110
24d560d7 CK	111	return sprintf(buf, "%d\n", reg_to_temp(value));
b3d7dc19 CK	112	}
b3d7dc19 CK	113
5f7bdaee CK	114	static ssize_t show_throttle(struct cbe_pmd_regs __iomem pmd_regs, char buf, int pos)
	115	{
	116	u64 value;
	117
	118	value = in_be64(&pmd_regs->tm_tpr.val);
	119	/* access the corresponding byte */
	120	value >>= pos;
	121	value &= 0x3F;
	122
	123	return sprintf(buf, "%d\n", reg_to_temp(value));
	124	}
	125
	126	static ssize_t store_throttle(struct cbe_pmd_regs __iomem pmd_regs, const char buf, size_t size, int pos)
	127	{
	128	u64 reg_value;
f5fc8229	129	unsigned int temp;
5f7bdaee CK	130	u64 new_value;
	131	int ret;
	132
	133	ret = sscanf(buf, "%u", &temp);
	134
	135	if (ret != 1 \|\| temp < TEMP_MIN \|\| temp > TEMP_MAX)
	136	return -EINVAL;
	137
	138	new_value = temp_to_reg(temp);
	139
	140	reg_value = in_be64(&pmd_regs->tm_tpr.val);
	141
	142	/* zero out bits for new value */
	143	reg_value &= ~(0xffull << pos);
	144	/* set bits to new value */
	145	reg_value \|= new_value << pos;
	146
	147	out_be64(&pmd_regs->tm_tpr.val, reg_value);
	148	return size;
	149	}
	150
8a25a2fd KS	151	static ssize_t spu_show_throttle_end(struct device *dev,
8a25a2fd KS	152	struct device_attribute attr, char buf)
5f7bdaee	153	{
8a25a2fd	154	return show_throttle(get_pmd_regs(dev), buf, 0);
5f7bdaee CK	155	}
5f7bdaee CK	156
8a25a2fd KS	157	static ssize_t spu_show_throttle_begin(struct device *dev,
8a25a2fd KS	158	struct device_attribute attr, char buf)
5f7bdaee	159	{
8a25a2fd	160	return show_throttle(get_pmd_regs(dev), buf, 8);
5f7bdaee CK	161	}
5f7bdaee CK	162
8a25a2fd KS	163	static ssize_t spu_show_throttle_full_stop(struct device *dev,
8a25a2fd KS	164	struct device_attribute attr, char buf)
5f7bdaee	165	{
8a25a2fd	166	return show_throttle(get_pmd_regs(dev), buf, 16);
5f7bdaee CK	167	}
5f7bdaee CK	168
8a25a2fd KS	169	static ssize_t spu_store_throttle_end(struct device *dev,
8a25a2fd KS	170	struct device_attribute attr, const char buf, size_t size)
5f7bdaee	171	{
8a25a2fd	172	return store_throttle(get_pmd_regs(dev), buf, size, 0);
5f7bdaee CK	173	}
5f7bdaee CK	174
8a25a2fd KS	175	static ssize_t spu_store_throttle_begin(struct device *dev,
8a25a2fd KS	176	struct device_attribute attr, const char buf, size_t size)
5f7bdaee	177	{
8a25a2fd	178	return store_throttle(get_pmd_regs(dev), buf, size, 8);
5f7bdaee CK	179	}
5f7bdaee CK	180
8a25a2fd KS	181	static ssize_t spu_store_throttle_full_stop(struct device *dev,
8a25a2fd KS	182	struct device_attribute attr, const char buf, size_t size)
5f7bdaee	183	{
8a25a2fd	184	return store_throttle(get_pmd_regs(dev), buf, size, 16);
5f7bdaee CK	185	}
5f7bdaee CK	186
8a25a2fd	187	static ssize_t ppe_show_temp(struct device dev, char buf, int pos)
b3d7dc19 CK	188	{
	189	struct cbe_pmd_regs __iomem *pmd_regs;
	190	u64 value;
	191
8a25a2fd	192	pmd_regs = cbe_get_cpu_pmd_regs(dev->id);
b3d7dc19 CK	193	value = in_be64(&pmd_regs->ts_ctsr2);
b3d7dc19 CK	194
24d560d7	195	value = (value >> pos) & 0x3f;
b3d7dc19	196
24d560d7	197	return sprintf(buf, "%d\n", reg_to_temp(value));
b3d7dc19 CK	198	}
	199
	200
	201	/* shows the temperature of the DTS on the PPE,
	202	* located near the linear thermal sensor */
8a25a2fd KS	203	static ssize_t ppe_show_temp0(struct device *dev,
8a25a2fd KS	204	struct device_attribute attr, char buf)
b3d7dc19	205	{
8a25a2fd	206	return ppe_show_temp(dev, buf, 32);
b3d7dc19 CK	207	}
	208
	209	/* shows the temperature of the second DTS on the PPE */
8a25a2fd KS	210	static ssize_t ppe_show_temp1(struct device *dev,
8a25a2fd KS	211	struct device_attribute attr, char buf)
b3d7dc19	212	{
8a25a2fd	213	return ppe_show_temp(dev, buf, 0);
b3d7dc19 CK	214	}
b3d7dc19 CK	215
8a25a2fd KS	216	static ssize_t ppe_show_throttle_end(struct device *dev,
8a25a2fd KS	217	struct device_attribute attr, char buf)
5f7bdaee	218	{
8a25a2fd	219	return show_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, 32);
5f7bdaee CK	220	}
5f7bdaee CK	221
8a25a2fd KS	222	static ssize_t ppe_show_throttle_begin(struct device *dev,
8a25a2fd KS	223	struct device_attribute attr, char buf)
5f7bdaee	224	{
8a25a2fd	225	return show_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, 40);
5f7bdaee CK	226	}
5f7bdaee CK	227
8a25a2fd KS	228	static ssize_t ppe_show_throttle_full_stop(struct device *dev,
8a25a2fd KS	229	struct device_attribute attr, char buf)
5f7bdaee	230	{
8a25a2fd	231	return show_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, 48);
5f7bdaee CK	232	}
5f7bdaee CK	233
8a25a2fd KS	234	static ssize_t ppe_store_throttle_end(struct device *dev,
8a25a2fd KS	235	struct device_attribute attr, const char buf, size_t size)
5f7bdaee	236	{
8a25a2fd	237	return store_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, size, 32);
5f7bdaee CK	238	}
5f7bdaee CK	239
8a25a2fd KS	240	static ssize_t ppe_store_throttle_begin(struct device *dev,
8a25a2fd KS	241	struct device_attribute attr, const char buf, size_t size)
5f7bdaee	242	{
8a25a2fd	243	return store_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, size, 40);
5f7bdaee CK	244	}
5f7bdaee CK	245
8a25a2fd KS	246	static ssize_t ppe_store_throttle_full_stop(struct device *dev,
8a25a2fd KS	247	struct device_attribute attr, const char buf, size_t size)
5f7bdaee	248	{
8a25a2fd	249	return store_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, size, 48);
5f7bdaee CK	250	}
	251
	252
8a25a2fd	253	static struct device_attribute attr_spu_temperature = {
b3d7dc19 CK	254	.attr = {.name = "temperature", .mode = 0400 },
	255	.show = spu_show_temp,
	256	};
	257
8a25a2fd KS	258	static DEVICE_PREFIX_ATTR(spu, throttle_end, 0600);
	259	static DEVICE_PREFIX_ATTR(spu, throttle_begin, 0600);
	260	static DEVICE_PREFIX_ATTR(spu, throttle_full_stop, 0600);
5f7bdaee CK	261
5f7bdaee CK	262
b3d7dc19 CK	263	static struct attribute *spu_attributes[] = {
b3d7dc19 CK	264	&attr_spu_temperature.attr,
5f7bdaee CK	265	&attr_spu_throttle_end.attr,
	266	&attr_spu_throttle_begin.attr,
	267	&attr_spu_throttle_full_stop.attr,
22b6e590	268	NULL,
b3d7dc19 CK	269	};
	270
	271	static struct attribute_group spu_attribute_group = {
	272	.name = "thermal",
	273	.attrs = spu_attributes,
	274	};
	275
8a25a2fd	276	static struct device_attribute attr_ppe_temperature0 = {
b3d7dc19 CK	277	.attr = {.name = "temperature0", .mode = 0400 },
	278	.show = ppe_show_temp0,
	279	};
	280
8a25a2fd	281	static struct device_attribute attr_ppe_temperature1 = {
b3d7dc19 CK	282	.attr = {.name = "temperature1", .mode = 0400 },
	283	.show = ppe_show_temp1,
	284	};
	285
8a25a2fd KS	286	static DEVICE_PREFIX_ATTR(ppe, throttle_end, 0600);
	287	static DEVICE_PREFIX_ATTR(ppe, throttle_begin, 0600);
	288	static DEVICE_PREFIX_ATTR(ppe, throttle_full_stop, 0600);
5f7bdaee	289
b3d7dc19 CK	290	static struct attribute *ppe_attributes[] = {
	291	&attr_ppe_temperature0.attr,
	292	&attr_ppe_temperature1.attr,
5f7bdaee CK	293	&attr_ppe_throttle_end.attr,
	294	&attr_ppe_throttle_begin.attr,
	295	&attr_ppe_throttle_full_stop.attr,
22b6e590	296	NULL,
b3d7dc19 CK	297	};
	298
	299	static struct attribute_group ppe_attribute_group = {
	300	.name = "thermal",
	301	.attrs = ppe_attributes,
	302	};
	303
	304	/*
	305	* initialize throttling with default values
	306	*/
827e3648	307	static int __init init_default_values(void)
b3d7dc19 CK	308	{
	309	int cpu;
	310	struct cbe_pmd_regs __iomem *pmd_regs;
8a25a2fd	311	struct device *dev;
b3d7dc19 CK	312	union ppe_spe_reg tpr;
	313	union spe_reg str1;
	314	u64 str2;
	315	union spe_reg cr1;
	316	u64 cr2;
	317
	318	/* TPR defaults */
	319	/* ppe
	320	* 1F - no full stop
	321	* 08 - dynamic throttling starts if over 80 degrees
	322	* 03 - dynamic throttling ceases if below 70 degrees */
	323	tpr.ppe = 0x1F0803;
	324	/* spe
	325	* 10 - full stopped when over 96 degrees
	326	* 08 - dynamic throttling starts if over 80 degrees
	327	* 03 - dynamic throttling ceases if below 70 degrees
	328	*/
	329	tpr.spe = 0x100803;
	330
	331	/* STR defaults */
	332	/* str1
	333	* 10 - stop 16 of 32 cycles
	334	*/
	335	str1.val = 0x1010101010101010ull;
	336	/* str2
	337	* 10 - stop 16 of 32 cycles
	338	*/
	339	str2 = 0x10;
	340
	341	/* CR defaults */
	342	/* cr1
	343	* 4 - normal operation
	344	*/
	345	cr1.val = 0x0404040404040404ull;
	346	/* cr2
	347	* 4 - normal operation
	348	*/
	349	cr2 = 0x04;
	350
	351	for_each_possible_cpu (cpu) {
	352	pr_debug("processing cpu %d\n", cpu);
8a25a2fd	353	dev = get_cpu_device(cpu);
827e3648	354
8a25a2fd KS	355	if (!dev) {
8a25a2fd KS	356	pr_info("invalid dev pointer for cbe_thermal\n");
827e3648 JCD	357	return -EINVAL;
	358	}
	359
8a25a2fd	360	pmd_regs = cbe_get_cpu_pmd_regs(dev->id);
b3d7dc19	361
827e3648 JCD	362	if (!pmd_regs) {
	363	pr_info("invalid CBE regs pointer for cbe_thermal\n");
	364	return -EINVAL;
	365	}
	366
b3d7dc19 CK	367	out_be64(&pmd_regs->tm_str2, str2);
	368	out_be64(&pmd_regs->tm_str1.val, str1.val);
	369	out_be64(&pmd_regs->tm_tpr.val, tpr.val);
	370	out_be64(&pmd_regs->tm_cr1.val, cr1.val);
	371	out_be64(&pmd_regs->tm_cr2, cr2);
	372	}
827e3648 JCD	373
827e3648 JCD	374	return 0;
b3d7dc19 CK	375	}
	376
	377
	378	static int __init thermal_init(void)
	379	{
827e3648	380	int rc = init_default_values();
b3d7dc19	381
827e3648	382	if (rc == 0) {
8a25a2fd KS	383	spu_add_dev_attr_group(&spu_attribute_group);
8a25a2fd KS	384	cpu_add_dev_attr_group(&ppe_attribute_group);
827e3648	385	}
b3d7dc19	386
827e3648	387	return rc;
b3d7dc19 CK	388	}
	389	module_init(thermal_init);
	390
	391	static void __exit thermal_exit(void)
	392	{
8a25a2fd KS	393	spu_remove_dev_attr_group(&spu_attribute_group);
8a25a2fd KS	394	cpu_remove_dev_attr_group(&ppe_attribute_group);
b3d7dc19 CK	395	}
	396	module_exit(thermal_exit);
	397
	398	MODULE_LICENSE("GPL");
	399	MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
	400