arch/powerpc/platforms/cell/cbe_thermal.c

   1 /*
   2  * thermal support for the cell processor
   3  *
   4  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
   5  *
   6  * Author: Christian Krafft <krafft@de.ibm.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/sysdev.h>
  25 #include <linux/kernel.h>
  26 #include <linux/cpu.h>
  27 #include <asm/spu.h>
  28 #include <asm/io.h>
  29 #include <asm/prom.h>
  30
  31 #include "cbe_regs.h"
  32 #include "spu_priv1_mmio.h"
  33
  34 static struct cbe_pmd_regs __iomem *get_pmd_regs(struct sys_device *sysdev)
  35 {
  36         struct spu *spu;
  37
  38         spu = container_of(sysdev, struct spu, sysdev);
  39
  40         return cbe_get_pmd_regs(spu_devnode(spu));
  41 }
  42
  43 /* returns the value for a given spu in a given register */
  44 static u8 spu_read_register_value(struct sys_device *sysdev, union spe_reg __iomem *reg)
  45 {
  46         unsigned int *id;
  47         union spe_reg value;
  48         struct spu *spu;
  49
  50         /* getting the id from the reg attribute will not work on future device-tree layouts
  51          * in future we should store the id to the spu struct and use it here */
  52         spu = container_of(sysdev, struct spu, sysdev);
  53         id = (unsigned int *)get_property(spu_devnode(spu), "reg", NULL);
  54         value.val = in_be64(&reg->val);
  55
  56         return value.spe[*id];
  57 }
  58
  59 static ssize_t spu_show_temp(struct sys_device *sysdev, char *buf)
  60 {
  61         int value;
  62         struct cbe_pmd_regs __iomem *pmd_regs;
  63
  64         pmd_regs = get_pmd_regs(sysdev);
  65
  66         value = spu_read_register_value(sysdev, &pmd_regs->ts_ctsr1);
  67         /* clear all other bits */
  68         value &= 0x3F;
  69         /* temp is stored in steps of 2 degrees */
  70         value *= 2;
  71         /* base temp is 65 degrees */
  72         value += 65;
  73
  74         return sprintf(buf, "%d\n", (int) value);
  75 }
  76
  77 static ssize_t ppe_show_temp(struct sys_device *sysdev, char *buf, int pos)
  78 {
  79         struct cbe_pmd_regs __iomem *pmd_regs;
  80         u64 value;
  81
  82         pmd_regs = cbe_get_cpu_pmd_regs(sysdev->id);
  83         value = in_be64(&pmd_regs->ts_ctsr2);
  84
  85         /* access the corresponding byte */
  86         value >>= pos;
  87         /* clear all other bits */
  88         value &= 0x3F;
  89         /* temp is stored in steps of 2 degrees */
  90         value *= 2;
  91         /* base temp is 65 degrees */
  92         value += 65;
  93
  94         return sprintf(buf, "%d\n", (int) value);
  95 }
  96
  97
  98 /* shows the temperature of the DTS on the PPE,
  99  * located near the linear thermal sensor */
 100 static ssize_t ppe_show_temp0(struct sys_device *sysdev, char *buf)
 101 {
 102         return ppe_show_temp(sysdev, buf, 32);
 103 }
 104
 105 /* shows the temperature of the second DTS on the PPE */
 106 static ssize_t ppe_show_temp1(struct sys_device *sysdev, char *buf)
 107 {
 108         return ppe_show_temp(sysdev, buf, 0);
 109 }
 110
 111 static struct sysdev_attribute attr_spu_temperature = {
 112         .attr = {.name = "temperature", .mode = 0400 },
 113         .show = spu_show_temp,
 114 };
 115
 116 static struct attribute *spu_attributes[] = {
 117         &attr_spu_temperature.attr,
 118         NULL,
 119 };
 120
 121 static struct attribute_group spu_attribute_group = {
 122         .name   = "thermal",
 123         .attrs  = spu_attributes,
 124 };
 125
 126 static struct sysdev_attribute attr_ppe_temperature0 = {
 127         .attr = {.name = "temperature0", .mode = 0400 },
 128         .show = ppe_show_temp0,
 129 };
 130
 131 static struct sysdev_attribute attr_ppe_temperature1 = {
 132         .attr = {.name = "temperature1", .mode = 0400 },
 133         .show = ppe_show_temp1,
 134 };
 135
 136 static struct attribute *ppe_attributes[] = {
 137         &attr_ppe_temperature0.attr,
 138         &attr_ppe_temperature1.attr,
 139         NULL,
 140 };
 141
 142 static struct attribute_group ppe_attribute_group = {
 143         .name   = "thermal",
 144         .attrs  = ppe_attributes,
 145 };
 146
 147 /*
 148  * initialize throttling with default values
 149  */
 150 static void __init init_default_values(void)
 151 {
 152         int cpu;
 153         struct cbe_pmd_regs __iomem *pmd_regs;
 154         struct sys_device *sysdev;
 155         union ppe_spe_reg tpr;
 156         union spe_reg str1;
 157         u64 str2;
 158         union spe_reg cr1;
 159         u64 cr2;
 160
 161         /* TPR defaults */
 162         /* ppe
 163          *      1F - no full stop
 164          *      08 - dynamic throttling starts if over 80 degrees
 165          *      03 - dynamic throttling ceases if below 70 degrees */
 166         tpr.ppe = 0x1F0803;
 167         /* spe
 168          *      10 - full stopped when over 96 degrees
 169          *      08 - dynamic throttling starts if over 80 degrees
 170          *      03 - dynamic throttling ceases if below 70 degrees
 171          */
 172         tpr.spe = 0x100803;
 173
 174         /* STR defaults */
 175         /* str1
 176          *      10 - stop 16 of 32 cycles
 177          */
 178         str1.val = 0x1010101010101010ull;
 179         /* str2
 180          *      10 - stop 16 of 32 cycles
 181          */
 182         str2 = 0x10;
 183
 184         /* CR defaults */
 185         /* cr1
 186          *      4 - normal operation
 187          */
 188         cr1.val = 0x0404040404040404ull;
 189         /* cr2
 190          *      4 - normal operation
 191          */
 192         cr2 = 0x04;
 193
 194         for_each_possible_cpu (cpu) {
 195                 pr_debug("processing cpu %d\n", cpu);
 196                 sysdev = get_cpu_sysdev(cpu);
 197                 pmd_regs = cbe_get_cpu_pmd_regs(sysdev->id);
 198
 199                 out_be64(&pmd_regs->tm_str2, str2);
 200                 out_be64(&pmd_regs->tm_str1.val, str1.val);
 201                 out_be64(&pmd_regs->tm_tpr.val, tpr.val);
 202                 out_be64(&pmd_regs->tm_cr1.val, cr1.val);
 203                 out_be64(&pmd_regs->tm_cr2, cr2);
 204         }
 205 }
 206
 207
 208 static int __init thermal_init(void)
 209 {
 210         init_default_values();
 211
 212         spu_add_sysdev_attr_group(&spu_attribute_group);
 213         cpu_add_sysdev_attr_group(&ppe_attribute_group);
 214
 215         return 0;
 216 }
 217 module_init(thermal_init);
 218
 219 static void __exit thermal_exit(void)
 220 {
 221         spu_remove_sysdev_attr_group(&spu_attribute_group);
 222         cpu_remove_sysdev_attr_group(&ppe_attribute_group);
 223 }
 224 module_exit(thermal_exit);
 225
 226 MODULE_LICENSE("GPL");
 227 MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
 228