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@solarflare.com>]

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h
index f8a0d9c0e990..a1b75cd67b9d 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) */