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iwlwifi: implement iwl5000_calc_rssi

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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>
This commit is contained in:
Tomas Winkler 2008-08-04 16:00:42 +08:00 committed by John W. Linville
parent da99c4b6c2
commit caab8f1a5d
5 changed files with 119 additions and 51 deletions
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35
drivers/net/wireless/iwlwifi/iwl-4965.c
View File

@ -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 = {

39
drivers/net/wireless/iwlwifi/iwl-5000.c
View File

@ -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 = {

35
drivers/net/wireless/iwlwifi/iwl-commands.h
View File

@ -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;

2
drivers/net/wireless/iwlwifi/iwl-core.h
View File

@ -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 {

57
drivers/net/wireless/iwlwifi/iwl-rx.c
View File

@ -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");
@ -1033,7 +1033,7 @@ 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) +
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);