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Message-ID: <1342491842-29818-5-git-send-email-mchan@broadcom.com>
Date: Mon, 16 Jul 2012 19:24:02 -0700
From: "Michael Chan" <mchan@...adcom.com>
To: davem@...emloft.net
cc: netdev@...r.kernel.org
Subject: [PATCH 4/4 v3 net-next] tg3: Add hwmon support for temperature
Some tg3 devices have management firmware that can export sensor data.
Export temperature sensor reading via hwmon sysfs.
[hwmon interface suggested by Ben Hutchings <bhutchings@...arflare.com>]
Signed-off-by: Matt Carlson <mcarlson@...adcom.com>
Signed-off-by: Nithin Nayak Sujir <nsujir@...adcom.com>
Signed-off-by: Michael Chan <mchan@...adcom.com>
---
drivers/net/ethernet/broadcom/tg3.c | 112 +++++++++++++++++++++++++++++++++++
drivers/net/ethernet/broadcom/tg3.h | 38 ++++++++++++
2 files changed, 150 insertions(+), 0 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 26ca368..fce4c1e 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -44,6 +44,10 @@
#include <linux/prefetch.h>
#include <linux/dma-mapping.h>
#include <linux/firmware.h>
+#if IS_ENABLED(CONFIG_HWMON)
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#endif
#include <net/checksum.h>
#include <net/ip.h>
@@ -9481,6 +9485,110 @@ static int tg3_init_hw(struct tg3 *tp, int reset_phy)
return tg3_reset_hw(tp, reset_phy);
}
+#if IS_ENABLED(CONFIG_HWMON)
+static void tg3_sd_scan_scratchpad(struct tg3 *tp, struct tg3_ocir *ocir)
+{
+ int i;
+
+ for (i = 0; i < TG3_SD_NUM_RECS; i++, ocir++) {
+ u32 off = i * TG3_OCIR_LEN, len = TG3_OCIR_LEN;
+
+ tg3_ape_scratchpad_read(tp, (u32 *) ocir, off, len);
+ off += len;
+
+ if (ocir->signature != TG3_OCIR_SIG_MAGIC ||
+ !(ocir->version_flags & TG3_OCIR_FLAG_ACTIVE))
+ memset(ocir, 0, TG3_OCIR_LEN);
+ }
+}
+
+/* sysfs attributes for hwmon */
+static ssize_t tg3_show_temp(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct net_device *netdev = pci_get_drvdata(pdev);
+ struct tg3 *tp = netdev_priv(netdev);
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ u32 temperature;
+
+ spin_lock_bh(&tp->lock);
+ tg3_ape_scratchpad_read(tp, &temperature, attr->index,
+ sizeof(temperature));
+ spin_unlock_bh(&tp->lock);
+ return sprintf(buf, "%u\n", temperature);
+}
+
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tg3_show_temp, NULL,
+ TG3_TEMP_SENSOR_OFFSET);
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, tg3_show_temp, NULL,
+ TG3_TEMP_CAUTION_OFFSET);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, tg3_show_temp, NULL,
+ TG3_TEMP_MAX_OFFSET);
+
+static struct attribute *tg3_attributes[] = {
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_crit.dev_attr.attr,
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group tg3_group = {
+ .attrs = tg3_attributes,
+};
+
+#endif
+
+static void tg3_hwmon_close(struct tg3 *tp)
+{
+#if IS_ENABLED(CONFIG_HWMON)
+ if (tp->hwmon_dev) {
+ hwmon_device_unregister(tp->hwmon_dev);
+ tp->hwmon_dev = NULL;
+ sysfs_remove_group(&tp->pdev->dev.kobj, &tg3_group);
+ }
+#endif
+}
+
+static void tg3_hwmon_open(struct tg3 *tp)
+{
+#if IS_ENABLED(CONFIG_HWMON)
+ int i, err;
+ u32 size = 0;
+ struct pci_dev *pdev = tp->pdev;
+ struct tg3_ocir ocirs[TG3_SD_NUM_RECS];
+
+ tg3_sd_scan_scratchpad(tp, ocirs);
+
+ for (i = 0; i < TG3_SD_NUM_RECS; i++) {
+ if (!ocirs[i].src_data_length)
+ continue;
+
+ size += ocirs[i].src_hdr_length;
+ size += ocirs[i].src_data_length;
+ }
+
+ if (!size)
+ return;
+
+ /* Register hwmon sysfs hooks */
+ err = sysfs_create_group(&pdev->dev.kobj, &tg3_group);
+ if (err) {
+ dev_err(&pdev->dev, "Cannot create sysfs group, aborting\n");
+ return;
+ }
+
+ tp->hwmon_dev = hwmon_device_register(&pdev->dev);
+ if (IS_ERR(tp->hwmon_dev)) {
+ tp->hwmon_dev = NULL;
+ dev_err(&pdev->dev, "Cannot register hwmon device, aborting\n");
+ sysfs_remove_group(&pdev->dev.kobj, &tg3_group);
+ }
+#endif
+}
+
+
#define TG3_STAT_ADD32(PSTAT, REG) \
do { u32 __val = tr32(REG); \
(PSTAT)->low += __val; \
@@ -10189,6 +10297,8 @@ static int tg3_open(struct net_device *dev)
tg3_phy_start(tp);
+ tg3_hwmon_open(tp);
+
tg3_full_lock(tp, 0);
tg3_timer_start(tp);
@@ -10238,6 +10348,8 @@ static int tg3_close(struct net_device *dev)
tg3_timer_stop(tp);
+ tg3_hwmon_close(tp);
+
tg3_phy_stop(tp);
tg3_full_lock(tp, 1);
diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h
index f8a0d9c..a1b75cd 100644
--- a/drivers/net/ethernet/broadcom/tg3.h
+++ b/drivers/net/ethernet/broadcom/tg3.h
@@ -2676,6 +2676,40 @@ struct tg3_hw_stats {
u8 __reserved4[0xb00-0x9c8];
};
+#define TG3_SD_NUM_RECS 3
+#define TG3_OCIR_LEN (sizeof(struct tg3_ocir))
+#define TG3_OCIR_SIG_MAGIC 0x5253434f
+#define TG3_OCIR_FLAG_ACTIVE 0x00000001
+
+#define TG3_TEMP_CAUTION_OFFSET 0xc8
+#define TG3_TEMP_MAX_OFFSET 0xcc
+#define TG3_TEMP_SENSOR_OFFSET 0xd4
+
+
+struct tg3_ocir {
+ u32 signature;
+ u16 version_flags;
+ u16 refresh_int;
+ u32 refresh_tmr;
+ u32 update_tmr;
+ u32 dst_base_addr;
+ u16 src_hdr_offset;
+ u16 src_hdr_length;
+ u16 src_data_offset;
+ u16 src_data_length;
+ u16 dst_hdr_offset;
+ u16 dst_data_offset;
+ u16 dst_reg_upd_offset;
+ u16 dst_sem_offset;
+ u32 reserved1[2];
+ u32 port0_flags;
+ u32 port1_flags;
+ u32 port2_flags;
+ u32 port3_flags;
+ u32 reserved2[1];
+};
+
+
/* 'mapping' is superfluous as the chip does not write into
* the tx/rx post rings so we could just fetch it from there.
* But the cache behavior is better how we are doing it now.
@@ -3211,6 +3245,10 @@ struct tg3 {
const char *fw_needed;
const struct firmware *fw;
u32 fw_len; /* includes BSS */
+
+#if IS_ENABLED(CONFIG_HWMON)
+ struct device *hwmon_dev;
+#endif
};
#endif /* !(_T3_H) */
--
1.7.1
--
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