1 files changed, 226 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/cbe_thermal.c b/arch/powerpc/platforms/cell/cbe_thermal.c
new file mode 100644
index 00000000000..616a0a3fd0e
--- /dev/null
+++ b/arch/powerpc/platforms/cell/cbe_thermal.c
@@ -0,0 +1,226 @@
+/*
+ * 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"
+#include "spu_priv1_mmio.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(spu));
+}
+
+/* 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(spu), "reg", NULL);
+        value.val = in_be64(&reg->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>");
+