iwlwifi: implement iwl5000_calc_rssi

This patch implements rssi calculation for 5000 HW.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

5 files changed, 119 insertions, 51 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.c b/drivers/net/wireless/iwlwifi/iwl-4965.c
index 718f9d9e4947..22bb26985c2e 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.c
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.c
@@ -2258,6 +2258,40 @@ static void iwl4965_rx_reply_tx(struct iwl_priv *priv,
                 IWL_ERROR("TODO:  Implement Tx ABORT REQUIRED!!!\n");
 }
 
+static int iwl4965_calc_rssi(struct iwl_priv *priv,
+                             struct iwl_rx_phy_res *rx_resp)
+{
+        /* data from PHY/DSP regarding signal strength, etc.,
+         *   contents are always there, not configurable by host.  */
+        struct iwl4965_rx_non_cfg_phy *ncphy =
+            (struct iwl4965_rx_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
+        u32 agc = (le16_to_cpu(ncphy->agc_info) & IWL49_AGC_DB_MASK)
+                        >> IWL49_AGC_DB_POS;
+
+        u32 valid_antennae =
+            (le16_to_cpu(rx_resp->phy_flags) & IWL49_RX_PHY_FLAGS_ANTENNAE_MASK)
+                        >> IWL49_RX_PHY_FLAGS_ANTENNAE_OFFSET;
+        u8 max_rssi = 0;
+        u32 i;
+
+        /* Find max rssi among 3 possible receivers.
+         * These values are measured by the digital signal processor (DSP).
+         * They should stay fairly constant even as the signal strength varies,
+         *   if the radio's automatic gain control (AGC) is working right.
+         * AGC value (see below) will provide the "interesting" info. */
+        for (i = 0; i < 3; i++)
+                if (valid_antennae & (1 << i))
+                        max_rssi = max(ncphy->rssi_info[i << 1], max_rssi);
+
+        IWL_DEBUG_STATS("Rssi In A %d B %d C %d Max %d AGC dB %d\n",
+                ncphy->rssi_info[0], ncphy->rssi_info[2], ncphy->rssi_info[4],
+                max_rssi, agc);
+
+        /* dBm = max_rssi dB - agc dB - constant.
+         * Higher AGC (higher radio gain) means lower signal. */
+        return max_rssi - agc - IWL_RSSI_OFFSET;
+}
+
 
 /* Set up 4965-specific Rx frame reply handlers */
 static void iwl4965_rx_handler_setup(struct iwl_priv *priv)
@@ -2289,6 +2323,7 @@ static struct iwl_hcmd_utils_ops iwl4965_hcmd_utils = {
         .chain_noise_reset = iwl4965_chain_noise_reset,
         .gain_computation = iwl4965_gain_computation,
         .rts_tx_cmd_flag = iwl4965_rts_tx_cmd_flag,
+        .calc_rssi = iwl4965_calc_rssi,
 };
 
 static struct iwl_lib_ops iwl4965_lib = {
diff --git a/drivers/net/wireless/iwlwifi/iwl-5000.c b/drivers/net/wireless/iwlwifi/iwl-5000.c
index 56dbc8144a34..c5b104fd149c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-5000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-5000.c
@@ -1459,6 +1459,44 @@ static void iwl5000_temperature(struct iwl_priv *priv)
         priv->temperature = le32_to_cpu(priv->statistics.general.temperature);
 }
 
+/* Calc max signal level (dBm) among 3 possible receivers */
+static int iwl5000_calc_rssi(struct iwl_priv *priv,
+                             struct iwl_rx_phy_res *rx_resp)
+{
+        /* data from PHY/DSP regarding signal strength, etc.,
+         *   contents are always there, not configurable by host
+         */
+        struct iwl5000_non_cfg_phy *ncphy =
+                (struct iwl5000_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
+        u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
+        u8 agc;
+
+        val  = le32_to_cpu(ncphy->non_cfg_phy[IWL50_RX_RES_AGC_IDX]);
+        agc = (val & IWL50_OFDM_AGC_MSK) >> IWL50_OFDM_AGC_BIT_POS;
+
+        /* Find max rssi among 3 possible receivers.
+         * These values are measured by the digital signal processor (DSP).
+         * They should stay fairly constant even as the signal strength varies,
+         *   if the radio's automatic gain control (AGC) is working right.
+         * AGC value (see below) will provide the "interesting" info.
+         */
+        val = le32_to_cpu(ncphy->non_cfg_phy[IWL50_RX_RES_RSSI_AB_IDX]);
+        rssi_a = (val & IWL50_OFDM_RSSI_A_MSK) >> IWL50_OFDM_RSSI_A_BIT_POS;
+        rssi_b = (val & IWL50_OFDM_RSSI_B_MSK) >> IWL50_OFDM_RSSI_B_BIT_POS;
+        val = le32_to_cpu(ncphy->non_cfg_phy[IWL50_RX_RES_RSSI_C_IDX]);
+        rssi_c = (val & IWL50_OFDM_RSSI_C_MSK) >> IWL50_OFDM_RSSI_C_BIT_POS;
+
+        max_rssi = max_t(u32, rssi_a, rssi_b);
+        max_rssi = max_t(u32, max_rssi, rssi_c);
+
+        IWL_DEBUG_STATS("Rssi In A %d B %d C %d Max %d AGC dB %d\n",
+                rssi_a, rssi_b, rssi_c, max_rssi, agc);
+
+        /* dBm = max_rssi dB - agc dB - constant.
+         * Higher AGC (higher radio gain) means lower signal. */
+        return max_rssi - agc - IWL_RSSI_OFFSET;
+}
+
 static struct iwl_hcmd_ops iwl5000_hcmd = {
         .rxon_assoc = iwl5000_send_rxon_assoc,
 };
@@ -1469,6 +1507,7 @@ static struct iwl_hcmd_utils_ops iwl5000_hcmd_utils = {
         .gain_computation = iwl5000_gain_computation,
         .chain_noise_reset = iwl5000_chain_noise_reset,
         .rts_tx_cmd_flag = iwl5000_rts_tx_cmd_flag,
+        .calc_rssi = iwl5000_calc_rssi,
 };
 
 static struct iwl_lib_ops iwl5000_lib = {
diff --git a/drivers/net/wireless/iwlwifi/iwl-commands.h b/drivers/net/wireless/iwlwifi/iwl-commands.h
index 5e57f3ae2ea6..28b5b09996ed 100644
--- a/drivers/net/wireless/iwlwifi/iwl-commands.h
+++ b/drivers/net/wireless/iwlwifi/iwl-commands.h
@@ -1075,10 +1075,12 @@ struct iwl4965_rx_frame {
 } __attribute__ ((packed));
 
 /* Fixed (non-configurable) rx data from phy */
-#define RX_PHY_FLAGS_ANTENNAE_OFFSET            (4)
-#define RX_PHY_FLAGS_ANTENNAE_MASK              (0x70)
-#define IWL_AGC_DB_MASK         (0x3f80)        /* MASK(7,13) */
-#define IWL_AGC_DB_POS          (7)
+
+#define IWL49_RX_RES_PHY_CNT 14
+#define IWL49_RX_PHY_FLAGS_ANTENNAE_OFFSET      (4)
+#define IWL49_RX_PHY_FLAGS_ANTENNAE_MASK        (0x70)
+#define IWL49_AGC_DB_MASK                       (0x3f80)        /* MASK(7,13) */
+#define IWL49_AGC_DB_POS                        (7)
 struct iwl4965_rx_non_cfg_phy {
         __le16 ant_selection;   /* ant A bit 4, ant B bit 5, ant C bit 6 */
         __le16 agc_info;        /* agc code 0:6, agc dB 7:13, reserved 14:15 */
@@ -1086,12 +1088,30 @@ struct iwl4965_rx_non_cfg_phy {
         u8 pad[0];
 } __attribute__ ((packed));
 
+
+#define IWL50_RX_RES_PHY_CNT 8
+#define IWL50_RX_RES_AGC_IDX     1
+#define IWL50_RX_RES_RSSI_AB_IDX 2
+#define IWL50_RX_RES_RSSI_C_IDX  3
+#define IWL50_OFDM_AGC_MSK 0xfe00
+#define IWL50_OFDM_AGC_BIT_POS 9
+#define IWL50_OFDM_RSSI_A_MSK 0x00ff
+#define IWL50_OFDM_RSSI_A_BIT_POS 0
+#define IWL50_OFDM_RSSI_B_MSK 0xff0000
+#define IWL50_OFDM_RSSI_B_BIT_POS 16
+#define IWL50_OFDM_RSSI_C_MSK 0x00ff
+#define IWL50_OFDM_RSSI_C_BIT_POS 0
+
+struct iwl5000_non_cfg_phy {
+        __le32 non_cfg_phy[IWL50_RX_RES_PHY_CNT];  /* upto 8 phy entries */
+} __attribute__ ((packed));
+
+
 /*
  * REPLY_RX = 0xc3 (response only, not a command)
  * Used only for legacy (non 11n) frames.
  */
-#define RX_RES_PHY_CNT 14
-struct iwl4965_rx_phy_res {
+struct iwl_rx_phy_res {
         u8 non_cfg_phy_cnt;     /* non configurable DSP phy data byte count */
         u8 cfg_phy_cnt;         /* configurable DSP phy data byte count */
         u8 stat_id;             /* configurable DSP phy data set ID */
@@ -1100,8 +1120,7 @@ struct iwl4965_rx_phy_res {
         __le32 beacon_time_stamp; /* beacon at on-air rise */
         __le16 phy_flags;       /* general phy flags: band, modulation, ... */
         __le16 channel;         /* channel number */
-        __le16 non_cfg_phy[RX_RES_PHY_CNT];     /* upto 14 phy entries */
-        __le32 reserved2;
+        u8 non_cfg_phy_buf[32]; /* for various implementations of non_cfg_phy */
         __le32 rate_n_flags;    /* RATE_MCS_* */
         __le16 byte_count;      /* frame's byte-count */
         __le16 reserved3;
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h
index eaefa42f37c5..64f139e97444 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.h
+++ b/drivers/net/wireless/iwlwifi/iwl-core.h
@@ -95,6 +95,8 @@ struct iwl_hcmd_utils_ops {
         void (*chain_noise_reset)(struct iwl_priv *priv);
         void (*rts_tx_cmd_flag)(struct ieee80211_tx_info *info,
                         __le32 *tx_flags);
+        int  (*calc_rssi)(struct iwl_priv *priv,
+                          struct iwl_rx_phy_res *rx_resp);
 };
 
 struct iwl_lib_ops {
diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c
index e2d9afba38a5..f3f6ea49fdd2 100644
--- a/drivers/net/wireless/iwlwifi/iwl-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-rx.c
@@ -791,7 +791,7 @@ static inline void iwl_dbg_report_frame(struct iwl_priv *priv,
 
 static void iwl_add_radiotap(struct iwl_priv *priv,
                                  struct sk_buff *skb,
-                                 struct iwl4965_rx_phy_res *rx_start,
+                                 struct iwl_rx_phy_res *rx_start,
                                  struct ieee80211_rx_status *stats,
                                  u32 ampdu_status)
 {
@@ -1010,8 +1010,8 @@ static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
                                        struct ieee80211_rx_status *stats)
 {
         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
-        struct iwl4965_rx_phy_res *rx_start = (include_phy) ?
-            (struct iwl4965_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
+        struct iwl_rx_phy_res *rx_start = (include_phy) ?
+            (struct iwl_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
         struct ieee80211_hdr *hdr;
         u16 len;
         __le32 *rx_end;
@@ -1020,7 +1020,7 @@ static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
         u32 ampdu_status_legacy;
 
         if (!include_phy && priv->last_phy_res[0])
-                rx_start = (struct iwl4965_rx_phy_res *)&priv->last_phy_res[1];
+                rx_start = (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
 
         if (!rx_start) {
                 IWL_ERROR("MPDU frame without a PHY data\n");
@@ -1032,8 +1032,8 @@ static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 
                 len = le16_to_cpu(rx_start->byte_count);
 
-                rx_end = (__le32 *) ((u8 *) &pkt->u.raw[0] +
-                                  sizeof(struct iwl4965_rx_phy_res) +
+                rx_end = (__le32 *)((u8 *) &pkt->u.raw[0] +
+                                  sizeof(struct iwl_rx_phy_res) +
                                   rx_start->cfg_phy_cnt + len);
 
         } else {
@@ -1084,40 +1084,13 @@ static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 }
 
 /* Calc max signal level (dBm) among 3 possible receivers */
-static int iwl_calc_rssi(struct iwl_priv *priv,
-                             struct iwl4965_rx_phy_res *rx_resp)
+static inline int iwl_calc_rssi(struct iwl_priv *priv,
+                                struct iwl_rx_phy_res *rx_resp)
 {
-        /* data from PHY/DSP regarding signal strength, etc.,
-         *   contents are always there, not configurable by host.  */
-        struct iwl4965_rx_non_cfg_phy *ncphy =
-            (struct iwl4965_rx_non_cfg_phy *)rx_resp->non_cfg_phy;
-        u32 agc = (le16_to_cpu(ncphy->agc_info) & IWL_AGC_DB_MASK)
-                        >> IWL_AGC_DB_POS;
-
-        u32 valid_antennae =
-            (le16_to_cpu(rx_resp->phy_flags) & RX_PHY_FLAGS_ANTENNAE_MASK)
-                        >> RX_PHY_FLAGS_ANTENNAE_OFFSET;
-        u8 max_rssi = 0;
-        u32 i;
-
-        /* Find max rssi among 3 possible receivers.
-         * These values are measured by the digital signal processor (DSP).
-         * They should stay fairly constant even as the signal strength varies,
-         *   if the radio's automatic gain control (AGC) is working right.
-         * AGC value (see below) will provide the "interesting" info. */
-        for (i = 0; i < 3; i++)
-                if (valid_antennae & (1 << i))
-                        max_rssi = max(ncphy->rssi_info[i << 1], max_rssi);
-
-        IWL_DEBUG_STATS("Rssi In A %d B %d C %d Max %d AGC dB %d\n",
-                ncphy->rssi_info[0], ncphy->rssi_info[2], ncphy->rssi_info[4],
-                max_rssi, agc);
-
-        /* dBm = max_rssi dB - agc dB - constant.
-         * Higher AGC (higher radio gain) means lower signal. */
-        return max_rssi - agc - IWL_RSSI_OFFSET;
+        return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
 }
 
+
 static void iwl_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
 {
         unsigned long flags;
@@ -1180,9 +1153,9 @@ void iwl_rx_reply_rx(struct iwl_priv *priv,
          *   this rx packet for legacy frames,
          *   or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
         int include_phy = (pkt->hdr.cmd == REPLY_RX);
-        struct iwl4965_rx_phy_res *rx_start = (include_phy) ?
-                (struct iwl4965_rx_phy_res *)&(pkt->u.raw[0]) :
-                (struct iwl4965_rx_phy_res *)&priv->last_phy_res[1];
+        struct iwl_rx_phy_res *rx_start = (include_phy) ?
+                (struct iwl_rx_phy_res *)&(pkt->u.raw[0]) :
+                (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
         __le32 *rx_end;
         unsigned int len = 0;
         u16 fc;
@@ -1210,7 +1183,7 @@ void iwl_rx_reply_rx(struct iwl_priv *priv,
 
         if (!include_phy) {
                 if (priv->last_phy_res[0])
-                        rx_start = (struct iwl4965_rx_phy_res *)
+                        rx_start = (struct iwl_rx_phy_res *)
                                 &priv->last_phy_res[1];
                 else
                         rx_start = NULL;
@@ -1227,7 +1200,7 @@ void iwl_rx_reply_rx(struct iwl_priv *priv,
 
                 len = le16_to_cpu(rx_start->byte_count);
                 rx_end = (__le32 *)(pkt->u.raw + rx_start->cfg_phy_cnt +
-                                  sizeof(struct iwl4965_rx_phy_res) + len);
+                                  sizeof(struct iwl_rx_phy_res) + len);
         } else {
                 struct iwl4965_rx_mpdu_res_start *amsdu =
                         (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
@@ -1316,6 +1289,6 @@ void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
         priv->last_phy_res[0] = 1;
         memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
-               sizeof(struct iwl4965_rx_phy_res));
+               sizeof(struct iwl_rx_phy_res));
 }
 EXPORT_SYMBOL(iwl_rx_reply_rx_phy);