[PATCH v11 09/22] wifi: nxpwifi: add channel/frequency/power (cfp) support

Jeff Chen
2026-04-28T19:41:58Z

Add cfp.c to provide channel, frequency, and power utilities for the
nxpwifi driver.

Define supported data rates for 802.11a/b/g/n/ac and implement helpers
for converting between rate values and rate indices for legacy, HT, and
VHT formats. Add region-code-to-country mapping to support 802.11d
operation.

Provide utility functions for determining supported and active data
rates, mapping channel/frequency/power (CFP) triplets, adjusting RX rate
indices, and extracting rate information from cfg80211 scan requests.

Signed-off-by: Jeff Chen <jeff.chen_1@nxp.com>
---
drivers/net/wireless/nxp/nxpwifi/cfp.c | 458 +++++++++++++++++++++++++
1 file changed, 458 insertions(+)
create mode 100644 drivers/net/wireless/nxp/nxpwifi/cfp.c

diff --git a/drivers/net/wireless/nxp/nxpwifi/cfp.c b/drivers/net/wireless/nxp/nxpwifi/cfp.c
new file mode 100644
index 000000000000..e4adbeb6a09c
--- /dev/null
+++ b/drivers/net/wireless/nxp/nxpwifi/cfp.c
@@ -0,0 +1,458 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * nxpwifi: Channel, Frequency and Power
+ *
+ * Copyright 2011-2024 NXP
+ */
+
+#include "cfg.h"
+#include "util.h"
+#include "fw.h"
+#include "main.h"
+#include "cfg80211.h"
+
+/* 100mW */
+#define NXPWIFI_TX_PWR_DEFAULT 20
+/* 100mW */
+#define NXPWIFI_TX_PWR_US_DEFAULT 20
+/* 50mW */
+#define NXPWIFI_TX_PWR_JP_DEFAULT 16
+/* 100mW */
+#define NXPWIFI_TX_PWR_FR_100MW 20
+/* 10mW */
+#define NXPWIFI_TX_PWR_FR_10MW 10
+/* 100mW */
+#define NXPWIFI_TX_PWR_EMEA_DEFAULT 20
+
+static u8 supported_rates_a[A_SUPPORTED_RATES] = { 0x0c, 0x12, 0x18, 0x24,
+ 0xb0, 0x48, 0x60, 0x6c, 0 };
+static u16 nxpwifi_data_rates[NXPWIFI_SUPPORTED_RATES_EXT] = { 0x02, 0x04,
+ 0x0B, 0x16, 0x00, 0x0C, 0x12, 0x18,
+ 0x24, 0x30, 0x48, 0x60, 0x6C, 0x90,
+ 0x0D, 0x1A, 0x27, 0x34, 0x4E, 0x68,
+ 0x75, 0x82, 0x0C, 0x1B, 0x36, 0x51,
+ 0x6C, 0xA2, 0xD8, 0xF3, 0x10E, 0x00 };
+
+static u8 supported_rates_b[B_SUPPORTED_RATES] = { 0x02, 0x04, 0x0b, 0x16, 0 };
+
+static u8 supported_rates_g[G_SUPPORTED_RATES] = { 0x0c, 0x12, 0x18, 0x24,
+ 0x30, 0x48, 0x60, 0x6c, 0 };
+
+static u8 supported_rates_bg[BG_SUPPORTED_RATES] = { 0x02, 0x04, 0x0b, 0x0c,
+ 0x12, 0x16, 0x18, 0x24, 0x30, 0x48,
+ 0x60, 0x6c, 0 };
+
+u16 region_code_index[NXPWIFI_MAX_REGION_CODE] = { 0x00, 0x10, 0x20, 0x30,
+ 0x31, 0x32, 0x40, 0x41, 0x50 };
+
+/* mcs_rate: first 8 entries for 1x1; all 16 for 2x2. */
+static const u16 mcs_rate[4][16] = {
+ /* LGI 40M */
+ { 0x1b, 0x36, 0x51, 0x6c, 0xa2, 0xd8, 0xf3, 0x10e,
+ 0x36, 0x6c, 0xa2, 0xd8, 0x144, 0x1b0, 0x1e6, 0x21c },
+
+ /* SGI 40M */
+ { 0x1e, 0x3c, 0x5a, 0x78, 0xb4, 0xf0, 0x10e, 0x12c,
+ 0x3c, 0x78, 0xb4, 0xf0, 0x168, 0x1e0, 0x21c, 0x258 },
+
+ /* LGI 20M */
+ { 0x0d, 0x1a, 0x27, 0x34, 0x4e, 0x68, 0x75, 0x82,
+ 0x1a, 0x34, 0x4e, 0x68, 0x9c, 0xd0, 0xea, 0x104 },
+
+ /* SGI 20M */
+ { 0x0e, 0x1c, 0x2b, 0x39, 0x56, 0x73, 0x82, 0x90,
+ 0x1c, 0x39, 0x56, 0x73, 0xad, 0xe7, 0x104, 0x120 }
+};
+
+/* AC rates */
+static const u16 ac_mcs_rate_nss1[8][10] = {
+ /* LG 160M */
+ { 0x75, 0xEA, 0x15F, 0x1D4, 0x2BE, 0x3A8, 0x41D,
+ 0x492, 0x57C, 0x618 },
+
+ /* SG 160M */
+ { 0x82, 0x104, 0x186, 0x208, 0x30C, 0x410, 0x492,
+ 0x514, 0x618, 0x6C6 },
+
+ /* LG 80M */
+ { 0x3B, 0x75, 0xB0, 0xEA, 0x15F, 0x1D4, 0x20F,
+ 0x249, 0x2BE, 0x30C },
+
+ /* SG 80M */
+ { 0x41, 0x82, 0xC3, 0x104, 0x186, 0x208, 0x249,
+ 0x28A, 0x30C, 0x363 },
+
+ /* LG 40M */
+ { 0x1B, 0x36, 0x51, 0x6C, 0xA2, 0xD8, 0xF3,
+ 0x10E, 0x144, 0x168 },
+
+ /* SG 40M */
+ { 0x1E, 0x3C, 0x5A, 0x78, 0xB4, 0xF0, 0x10E,
+ 0x12C, 0x168, 0x190 },
+
+ /* LG 20M */
+ { 0xD, 0x1A, 0x27, 0x34, 0x4E, 0x68, 0x75, 0x82, 0x9C, 0x00 },
+
+ /* SG 20M */
+ { 0xF, 0x1D, 0x2C, 0x3A, 0x57, 0x74, 0x82, 0x91, 0xAE, 0x00 },
+};
+
+/* NSS2 note: the value in the table is 2 multiplier of the actual rate */
+static const u16 ac_mcs_rate_nss2[8][10] = {
+ /* LG 160M */
+ { 0xEA, 0x1D4, 0x2BE, 0x3A8, 0x57C, 0x750, 0x83A,
+ 0x924, 0xAF8, 0xC30 },
+
+ /* SG 160M */
+ { 0x104, 0x208, 0x30C, 0x410, 0x618, 0x820, 0x924,
+ 0xA28, 0xC30, 0xD8B },
+
+ /* LG 80M */
+ { 0x75, 0xEA, 0x15F, 0x1D4, 0x2BE, 0x3A8, 0x41D,
+ 0x492, 0x57C, 0x618 },
+
+ /* SG 80M */
+ { 0x82, 0x104, 0x186, 0x208, 0x30C, 0x410, 0x492,
+ 0x514, 0x618, 0x6C6 },
+
+ /* LG 40M */
+ { 0x36, 0x6C, 0xA2, 0xD8, 0x144, 0x1B0, 0x1E6,
+ 0x21C, 0x288, 0x2D0 },
+
+ /* SG 40M */
+ { 0x3C, 0x78, 0xB4, 0xF0, 0x168, 0x1E0, 0x21C,
+ 0x258, 0x2D0, 0x320 },
+
+ /* LG 20M */
+ { 0x1A, 0x34, 0x4A, 0x68, 0x9C, 0xD0, 0xEA, 0x104,
+ 0x138, 0x00 },
+
+ /* SG 20M */
+ { 0x1D, 0x3A, 0x57, 0x74, 0xAE, 0xE6, 0x104, 0x121,
+ 0x15B, 0x00 },
+};
+
+struct region_code_mapping {
+ u8 code;
+ u8 region[IEEE80211_COUNTRY_STRING_LEN];
+};
+
+static struct region_code_mapping region_code_mapping_t[] = {
+ { 0x10, "US " }, /* US FCC */
+ { 0x20, "CA " }, /* IC Canada */
+ { 0x30, "FR " }, /* France */
+ { 0x31, "ES " }, /* Spain */
+ { 0x32, "FR " }, /* France */
+ { 0x40, "JP " }, /* Japan */
+ { 0x41, "JP " }, /* Japan */
+ { 0x50, "CN " }, /* China */
+};
+
+/* Convert 11d country code to region string. */
+u8 *nxpwifi_11d_code_2_region(u8 code)
+{
+ u8 i;
+
+ /* Look for code in mapping table */
+ for (i = 0; i < ARRAY_SIZE(region_code_mapping_t); i++)
+ if (region_code_mapping_t[i].code == code)
+ return region_code_mapping_t[i].region;
+
+ return NULL;
+}
+
+/* Map supported rate index to AC/VHT data rate. */
+u32 nxpwifi_index_to_acs_data_rate(struct nxpwifi_private *priv,
+ u8 index, u8 ht_info)
+{
+ u32 rate = 0;
+ u8 mcs_index = 0;
+ u8 bw = 0;
+ u8 gi = 0;
+
+ if ((ht_info & 0x3) == NXPWIFI_RATE_FORMAT_VHT) {
+ mcs_index = min(index & 0xF, 9);
+
+ /* 20M: bw=0, 40M: bw=1, 80M: bw=2, 160M: bw=3 */
+ bw = (ht_info & 0xC) >> 2;
+
+ /* LGI: gi =0, SGI: gi = 1 */
+ gi = (ht_info & 0x10) >> 4;
+
+ if ((index >> 4) == 1) /* NSS = 2 */
+ rate = ac_mcs_rate_nss2[2 * (3 - bw) + gi][mcs_index];
+ else /* NSS = 1 */
+ rate = ac_mcs_rate_nss1[2 * (3 - bw) + gi][mcs_index];
+ } else if ((ht_info & 0x3) == NXPWIFI_RATE_FORMAT_HT) {
+ /* 20M: bw=0, 40M: bw=1 */
+ bw = (ht_info & 0xC) >> 2;
+
+ /* LGI: gi =0, SGI: gi = 1 */
+ gi = (ht_info & 0x10) >> 4;
+
+ if (index == NXPWIFI_RATE_BITMAP_MCS0) {
+ if (gi == 1)
+ rate = 0x0D; /* MCS 32 SGI rate */
+ else
+ rate = 0x0C; /* MCS 32 LGI rate */
+ } else if (index < 16) {
+ if (bw == 1 || bw == 0)
+ rate = mcs_rate[2 * (1 - bw) + gi][index];
+ else
+ rate = nxpwifi_data_rates[0];
+ } else {
+ rate = nxpwifi_data_rates[0];
+ }
+ } else {
+ /* 11n non-HT rates */
+ if (index >= NXPWIFI_SUPPORTED_RATES_EXT)
+ index = 0;
+ rate = nxpwifi_data_rates[index];
+ }
+
+ return rate;
+}
+
+/* Map supported rate index to data rate. */
+u32 nxpwifi_index_to_data_rate(struct nxpwifi_private *priv,
+ u8 index, u8 ht_info)
+{
+ u32 mcs_num_supp =
+ (priv->adapter->user_dev_mcs_support == HT_STREAM_2X2) ? 16 : 8;
+ u32 rate;
+
+ if (priv->adapter->is_hw_11ac_capable)
+ return nxpwifi_index_to_acs_data_rate(priv, index, ht_info);
+
+ if (ht_info & BIT(0)) {
+ if (index == NXPWIFI_RATE_BITMAP_MCS0) {
+ if (ht_info & BIT(2))
+ rate = 0x0D; /* MCS 32 SGI rate */
+ else
+ rate = 0x0C; /* MCS 32 LGI rate */
+ } else if (index < mcs_num_supp) {
+ if (ht_info & BIT(1)) {
+ if (ht_info & BIT(2))
+ /* SGI, 40M */
+ rate = mcs_rate[1][index];
+ else
+ /* LGI, 40M */
+ rate = mcs_rate[0][index];
+ } else {
+ if (ht_info & BIT(2))
+ /* SGI, 20M */
+ rate = mcs_rate[3][index];
+ else
+ /* LGI, 20M */
+ rate = mcs_rate[2][index];
+ }
+ } else {
+ rate = nxpwifi_data_rates[0];
+ }
+ } else {
+ if (index >= NXPWIFI_SUPPORTED_RATES_EXT)
+ index = 0;
+ rate = nxpwifi_data_rates[index];
+ }
+ return rate;
+}
+
+/* Return current active data rates (depends on connection). */
+u32 nxpwifi_get_active_data_rates(struct nxpwifi_private *priv, u8 *rates)
+{
+ if (!priv->media_connected)
+ return nxpwifi_get_supported_rates(priv, rates);
+ else
+ return nxpwifi_copy_rates(rates, 0,
+ priv->curr_bss_params.data_rates,
+ priv->curr_bss_params.num_of_rates);
+}
+
+/* Find Channel/Frequency/Power by band and channel or frequency. */
+struct nxpwifi_chan_freq_power *
+nxpwifi_get_cfp(struct nxpwifi_private *priv, u8 band, u16 channel, u32 freq)
+{
+ struct nxpwifi_chan_freq_power *cfp = NULL;
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_channel *ch = NULL;
+ int i;
+
+ if (!channel && !freq)
+ return cfp;
+
+ if (nxpwifi_band_to_radio_type(band) == HOST_SCAN_RADIO_TYPE_BG)
+ sband = priv->wdev.wiphy->bands[NL80211_BAND_2GHZ];
+ else
+ sband = priv->wdev.wiphy->bands[NL80211_BAND_5GHZ];
+
+ if (!sband) {
+ nxpwifi_dbg(priv->adapter, ERROR,
+ "%s: cannot find cfp by band %d\n",
+ __func__, band);
+ return cfp;
+ }
+
+ for (i = 0; i < sband->n_channels; i++) {
+ ch = &sband->channels[i];
+
+ if (ch->flags & IEEE80211_CHAN_DISABLED)
+ continue;
+
+ if (freq) {
+ if (ch->center_freq == freq)
+ break;
+ } else {
+ /* Find by valid channel. */
+ if (ch->hw_value == channel ||
+ channel == FIRST_VALID_CHANNEL)
+ break;
+ }
+ }
+ if (i == sband->n_channels) {
+ nxpwifi_dbg(priv->adapter, WARN,
+ "%s: cannot find cfp by band %d\t"
+ "& channel=%d freq=%d\n",
+ __func__, band, channel, freq);
+ } else {
+ if (!ch)
+ return cfp;
+
+ priv->cfp.channel = ch->hw_value;
+ priv->cfp.freq = ch->center_freq;
+ priv->cfp.max_tx_power = ch->max_power;
+ cfp = &priv->cfp;
+ }
+
+ return cfp;
+}
+
+/* Return true if data rate is set to auto. */
+u8
+nxpwifi_is_rate_auto(struct nxpwifi_private *priv)
+{
+ u32 i;
+ int rate_num = 0;
+
+ for (i = 0; i < ARRAY_SIZE(priv->bitmap_rates); i++)
+ if (priv->bitmap_rates[i])
+ rate_num++;
+
+ if (rate_num > 1)
+ return true;
+ else
+ return false;
+}
+
+/* Extract supported rates from cfg80211_scan_request bitmask. */
+u32 nxpwifi_get_rates_from_cfg80211(struct nxpwifi_private *priv,
+ u8 *rates, u8 radio_type)
+{
+ struct wiphy *wiphy = priv->adapter->wiphy;
+ struct cfg80211_scan_request *request = priv->scan_request;
+ u32 num_rates, rate_mask;
+ struct ieee80211_supported_band *sband;
+ int i;
+
+ if (radio_type) {
+ sband = wiphy->bands[NL80211_BAND_5GHZ];
+ if (WARN_ON_ONCE(!sband))
+ return 0;
+ rate_mask = request->rates[NL80211_BAND_5GHZ];
+ } else {
+ sband = wiphy->bands[NL80211_BAND_2GHZ];
+ if (WARN_ON_ONCE(!sband))
+ return 0;
+ rate_mask = request->rates[NL80211_BAND_2GHZ];
+ }
+
+ num_rates = 0;
+ for (i = 0; i < sband->n_bitrates; i++) {
+ if ((BIT(i) & rate_mask) == 0)
+ continue; /* skip rate */
+ rates[num_rates++] = (u8)(sband->bitrates[i].bitrate / 5);
+ }
+
+ return num_rates;
+}
+
+/* Convert config_bands to B/G/A band */
+static u16 nxpwifi_convert_config_bands(u16 config_bands)
+{
+ u16 bands = 0;
+
+ if (config_bands & BAND_B)
+ bands |= BAND_B;
+ if (config_bands & BAND_G || config_bands & BAND_GN ||
+ config_bands & BAND_GAC || config_bands & BAND_GAX)
+ bands |= BAND_G;
+ if (config_bands & BAND_A || config_bands & BAND_AN ||
+ config_bands & BAND_AAC || config_bands & BAND_AAX)
+ bands |= BAND_A;
+
+ return bands;
+}
+
+/* Get supported rates in infrastructure (STA/P2P client) mode. */
+u32 nxpwifi_get_supported_rates(struct nxpwifi_private *priv, u8 *rates)
+{
+ struct nxpwifi_adapter *adapter = priv->adapter;
+ u32 k = 0;
+ u16 bands = 0;
+
+ bands = nxpwifi_convert_config_bands(adapter->fw_bands);
+
+ if (priv->bss_mode == NL80211_IFTYPE_STATION) {
+ if (bands == BAND_B) {
+ /* B only */
+ nxpwifi_dbg(adapter, INFO, "info: infra band=%d\t"
+ "supported_rates_b\n",
+ priv->config_bands);
+ k = nxpwifi_copy_rates(rates, k, supported_rates_b,
+ sizeof(supported_rates_b));
+ } else if (bands == BAND_G) {
+ /* G only */
+ nxpwifi_dbg(adapter, INFO, "info: infra band=%d\t"
+ "supported_rates_g\n",
+ priv->config_bands);
+ k = nxpwifi_copy_rates(rates, k, supported_rates_g,
+ sizeof(supported_rates_g));
+ } else if (bands & (BAND_B | BAND_G)) {
+ /* BG only */
+ nxpwifi_dbg(adapter, INFO, "info: infra band=%d\t"
+ "supported_rates_bg\n",
+ priv->config_bands);
+ k = nxpwifi_copy_rates(rates, k, supported_rates_bg,
+ sizeof(supported_rates_bg));
+ } else if (bands & BAND_A) {
+ /* support A */
+ nxpwifi_dbg(adapter, INFO, "info: infra band=%d\t"
+ "supported_rates_a\n",
+ priv->config_bands);
+ k = nxpwifi_copy_rates(rates, k, supported_rates_a,
+ sizeof(supported_rates_a));
+ }
+ }
+
+ return k;
+}
+
+u8 nxpwifi_adjust_data_rate(struct nxpwifi_private *priv,
+ u8 rx_rate, u8 rate_info)
+{
+ u8 rate_index = 0;
+
+ /* HT40 */
+ if ((rate_info & BIT(0)) && (rate_info & BIT(1)))
+ rate_index = NXPWIFI_RATE_INDEX_MCS0 +
+ NXPWIFI_BW20_MCS_NUM + rx_rate;
+ else if (rate_info & BIT(0)) /* HT20 */
+ rate_index = NXPWIFI_RATE_INDEX_MCS0 + rx_rate;
+ else
+ rate_index = (rx_rate > NXPWIFI_RATE_INDEX_OFDM0) ?
+ rx_rate - 1 : rx_rate;
+
+ if (rate_index >= NXPWIFI_MAX_AC_RX_RATES)
+ rate_index = NXPWIFI_MAX_AC_RX_RATES - 1;
+
+ return rate_index;
+}
--
2.34.1