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path: root/drivers/hwmon/k8temp.c
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Diffstat (limited to 'drivers/hwmon/k8temp.c')
-rw-r--r--drivers/hwmon/k8temp.c55
1 files changed, 46 insertions, 9 deletions
diff --git a/drivers/hwmon/k8temp.c b/drivers/hwmon/k8temp.c
index bd2bde0..1fe9951 100644
--- a/drivers/hwmon/k8temp.c
+++ b/drivers/hwmon/k8temp.c
@@ -31,6 +31,7 @@
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
+#include <asm/processor.h>
#define TEMP_FROM_REG(val) (((((val) >> 16) & 0xff) - 49) * 1000)
#define REG_TEMP 0xe4
@@ -47,6 +48,8 @@ struct k8temp_data {
/* registers values */
u8 sensorsp; /* sensor presence bits - SEL_CORE & SEL_PLACE */
u32 temp[2][2]; /* core, place */
+ u8 swap_core_select; /* meaning of SEL_CORE is inverted */
+ u32 temp_offset;
};
static struct k8temp_data *k8temp_update_device(struct device *dev)
@@ -114,10 +117,15 @@ static ssize_t show_temp(struct device *dev,
to_sensor_dev_attr_2(devattr);
int core = attr->nr;
int place = attr->index;
+ int temp;
struct k8temp_data *data = k8temp_update_device(dev);
- return sprintf(buf, "%d\n",
- TEMP_FROM_REG(data->temp[core][place]));
+ if (data->swap_core_select)
+ core = core ? 0 : 1;
+
+ temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;
+
+ return sprintf(buf, "%d\n", temp);
}
/* core, place */
@@ -141,20 +149,49 @@ static int __devinit k8temp_probe(struct pci_dev *pdev,
int err;
u8 scfg;
u32 temp;
+ u8 model, stepping;
struct k8temp_data *data;
- u32 cpuid = cpuid_eax(1);
-
- /* this feature should be available since SH-C0 core */
- if ((cpuid == 0xf40) || (cpuid == 0xf50) || (cpuid == 0xf51)) {
- err = -ENODEV;
- goto exit;
- }
if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
+ model = boot_cpu_data.x86_model;
+ stepping = boot_cpu_data.x86_mask;
+
+ switch (boot_cpu_data.x86) {
+ case 0xf:
+ /* feature available since SH-C0, exclude older revisions */
+ if (((model == 4) && (stepping == 0)) ||
+ ((model == 5) && (stepping <= 1))) {
+ err = -ENODEV;
+ goto exit_free;
+ }
+
+ /*
+ * AMD NPT family 0fh, i.e. RevF and RevG:
+ * meaning of SEL_CORE bit is inverted
+ */
+ if (model >= 0x40) {
+ data->swap_core_select = 1;
+ dev_warn(&pdev->dev, "Temperature readouts might be "
+ "wrong - check erratum #141\n");
+ }
+
+ if ((model >= 0x69) &&
+ !(model == 0xc1 || model == 0x6c || model == 0x7c)) {
+ /*
+ * RevG desktop CPUs (i.e. no socket S1G1 parts)
+ * need additional offset, otherwise reported
+ * temperature is below ambient temperature
+ */
+ data->temp_offset = 21000;
+ }
+
+ break;
+ }
+
pci_read_config_byte(pdev, REG_TEMP, &scfg);
scfg &= ~(SEL_PLACE | SEL_CORE); /* Select sensor 0, core0 */
pci_write_config_byte(pdev, REG_TEMP, scfg);