diff options
| -rw-r--r-- | arch/powerpc/configs/cell_defconfig | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/cell/Kconfig | 5 | ||||
| -rw-r--r-- | arch/powerpc/platforms/cell/Makefile | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/cell/cbe_thermal.c | 225 |
4 files changed, 233 insertions, 0 deletions
diff --git a/arch/powerpc/configs/cell_defconfig b/arch/powerpc/configs/cell_defconfig index 892d5dd3254..910a33193d9 100644 --- a/arch/powerpc/configs/cell_defconfig +++ b/arch/powerpc/configs/cell_defconfig @@ -149,6 +149,7 @@ CONFIG_MMIO_NVRAM=y CONFIG_SPU_FS=m CONFIG_SPU_BASE=y CONFIG_CBE_RAS=y +CONFIG_CBE_THERM=m # # Kernel options diff --git a/arch/powerpc/platforms/cell/Kconfig b/arch/powerpc/platforms/cell/Kconfig index 3e430b489bb..77ae619c758 100644 --- a/arch/powerpc/platforms/cell/Kconfig +++ b/arch/powerpc/platforms/cell/Kconfig @@ -20,4 +20,9 @@ config CBE_RAS bool "RAS features for bare metal Cell BE" default y +config CBE_THERM + tristate "CBE thermal support" + default m + depends on CBE_RAS + endmenu diff --git a/arch/powerpc/platforms/cell/Makefile b/arch/powerpc/platforms/cell/Makefile index 412649b3529..90e131451af 100644 --- a/arch/powerpc/platforms/cell/Makefile +++ b/arch/powerpc/platforms/cell/Makefile @@ -3,6 +3,8 @@ obj-$(CONFIG_PPC_CELL_NATIVE) += interrupt.o iommu.o setup.o \ pmu.o obj-$(CONFIG_CBE_RAS) += ras.o +obj-$(CONFIG_CBE_THERM) += cbe_thermal.o + ifeq ($(CONFIG_SMP),y) obj-$(CONFIG_PPC_CELL_NATIVE) += smp.o endif diff --git a/arch/powerpc/platforms/cell/cbe_thermal.c b/arch/powerpc/platforms/cell/cbe_thermal.c new file mode 100644 index 00000000000..17831a92d91 --- /dev/null +++ b/arch/powerpc/platforms/cell/cbe_thermal.c @@ -0,0 +1,225 @@ +/* + * thermal support for the cell processor + * + * (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/sysdev.h> +#include <linux/kernel.h> +#include <linux/cpu.h> +#include <asm/spu.h> +#include <asm/io.h> +#include <asm/prom.h> + +#include "cbe_regs.h" + +static struct cbe_pmd_regs __iomem *get_pmd_regs(struct sys_device *sysdev) +{ + struct spu *spu; + + spu = container_of(sysdev, struct spu, sysdev); + + return cbe_get_pmd_regs(spu->devnode); +} + +/* returns the value for a given spu in a given register */ +static u8 spu_read_register_value(struct sys_device *sysdev, union spe_reg __iomem *reg) +{ + unsigned int *id; + union spe_reg value; + struct spu *spu; + + /* getting the id from the reg attribute will not work on future device-tree layouts + * in future we should store the id to the spu struct and use it here */ + spu = container_of(sysdev, struct spu, sysdev); + id = (unsigned int *)get_property(spu->devnode, "reg", NULL); + value.val = in_be64(®->val); + + return value.spe[*id]; +} + +static ssize_t spu_show_temp(struct sys_device *sysdev, char *buf) +{ + int value; + struct cbe_pmd_regs __iomem *pmd_regs; + + pmd_regs = get_pmd_regs(sysdev); + + value = spu_read_register_value(sysdev, &pmd_regs->ts_ctsr1); + /* clear all other bits */ + value &= 0x3F; + /* temp is stored in steps of 2 degrees */ + value *= 2; + /* base temp is 65 degrees */ + value += 65; + + return sprintf(buf, "%d\n", (int) value); +} + +static ssize_t ppe_show_temp(struct sys_device *sysdev, char *buf, int pos) +{ + struct cbe_pmd_regs __iomem *pmd_regs; + u64 value; + + pmd_regs = cbe_get_cpu_pmd_regs(sysdev->id); + value = in_be64(&pmd_regs->ts_ctsr2); + + /* access the corresponding byte */ + value >>= pos; + /* clear all other bits */ + value &= 0x3F; + /* temp is stored in steps of 2 degrees */ + value *= 2; + /* base temp is 65 degrees */ + value += 65; + + return sprintf(buf, "%d\n", (int) value); +} + + +/* shows the temperature of the DTS on the PPE, + * located near the linear thermal sensor */ +static ssize_t ppe_show_temp0(struct sys_device *sysdev, char *buf) +{ + return ppe_show_temp(sysdev, buf, 32); +} + +/* shows the temperature of the second DTS on the PPE */ +static ssize_t ppe_show_temp1(struct sys_device *sysdev, char *buf) +{ + return ppe_show_temp(sysdev, buf, 0); +} + +static struct sysdev_attribute attr_spu_temperature = { + .attr = {.name = "temperature", .mode = 0400 }, + .show = spu_show_temp, +}; + +static struct attribute *spu_attributes[] = { + &attr_spu_temperature.attr, +}; + +static struct attribute_group spu_attribute_group = { + .name = "thermal", + .attrs = spu_attributes, +}; + +static struct sysdev_attribute attr_ppe_temperature0 = { + .attr = {.name = "temperature0", .mode = 0400 }, + .show = ppe_show_temp0, +}; + +static struct sysdev_attribute attr_ppe_temperature1 = { + .attr = {.name = "temperature1", .mode = 0400 }, + .show = ppe_show_temp1, +}; + +static struct attribute *ppe_attributes[] = { + &attr_ppe_temperature0.attr, + &attr_ppe_temperature1.attr, +}; + +static struct attribute_group ppe_attribute_group = { + .name = "thermal", + .attrs = ppe_attributes, +}; + +/* + * initialize throttling with default values + */ +static void __init init_default_values(void) +{ + int cpu; + struct cbe_pmd_regs __iomem *pmd_regs; + struct sys_device *sysdev; + 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); + sysdev = get_cpu_sysdev(cpu); + pmd_regs = cbe_get_cpu_pmd_regs(sysdev->id); + + 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); + } +} + + +static int __init thermal_init(void) +{ + init_default_values(); + + spu_add_sysdev_attr_group(&spu_attribute_group); + cpu_add_sysdev_attr_group(&ppe_attribute_group); + + return 0; +} +module_init(thermal_init); + +static void __exit thermal_exit(void) +{ + spu_remove_sysdev_attr_group(&spu_attribute_group); + cpu_remove_sysdev_attr_group(&ppe_attribute_group); +} +module_exit(thermal_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>"); + |