1 files changed, 226 insertions, 14 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/eeprom.c b/drivers/net/wireless/mediatek/mt76/eeprom.c
index 665b54c5c8ae..3b47e85e95e7 100644
--- a/drivers/net/wireless/mediatek/mt76/eeprom.c
+++ b/drivers/net/wireless/mediatek/mt76/eeprom.c
@@ -9,8 +9,7 @@
 #include <linux/etherdevice.h>
 #include "mt76.h"
 
-static int
-mt76_get_of_eeprom(struct mt76_dev *dev, int len)
+int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int offset, int len)
 {
 #if defined(CONFIG_OF) && defined(CONFIG_MTD)
 	struct device_node *np = dev->dev->of_node;
@@ -18,7 +17,6 @@ mt76_get_of_eeprom(struct mt76_dev *dev, int len)
 	const __be32 *list;
 	const char *part;
 	phandle phandle;
-	int offset = 0;
 	int size;
 	size_t retlen;
 	int ret;
@@ -54,7 +52,7 @@ mt76_get_of_eeprom(struct mt76_dev *dev, int len)
 	}
 
 	offset = be32_to_cpup(list);
-	ret = mtd_read(mtd, offset, len, &retlen, dev->eeprom.data);
+	ret = mtd_read(mtd, offset, len, &retlen, eep);
 	put_mtd_device(mtd);
 	if (ret)
 		goto out_put_node;
@@ -65,7 +63,7 @@ mt76_get_of_eeprom(struct mt76_dev *dev, int len)
 	}
 
 	if (of_property_read_bool(dev->dev->of_node, "big-endian")) {
-		u8 *data = (u8 *)dev->eeprom.data;
+		u8 *data = (u8 *)eep;
 		int i;
 
 		/* convert eeprom data in Little Endian */
@@ -86,21 +84,15 @@ out_put_node:
 	return -ENOENT;
 #endif
 }
+EXPORT_SYMBOL_GPL(mt76_get_of_eeprom);
 
 void
 mt76_eeprom_override(struct mt76_phy *phy)
 {
 	struct mt76_dev *dev = phy->dev;
-
-#ifdef CONFIG_OF
 	struct device_node *np = dev->dev->of_node;
-	const u8 *mac = NULL;
 
-	if (np)
-		mac = of_get_mac_address(np);
-	if (!IS_ERR_OR_NULL(mac))
-		ether_addr_copy(phy->macaddr, mac);
-#endif
+	of_get_mac_address(np, phy->macaddr);
 
 	if (!is_valid_ether_addr(phy->macaddr)) {
 		eth_random_addr(phy->macaddr);
@@ -111,6 +103,226 @@ mt76_eeprom_override(struct mt76_phy *phy)
 }
 EXPORT_SYMBOL_GPL(mt76_eeprom_override);
 
+static bool mt76_string_prop_find(struct property *prop, const char *str)
+{
+	const char *cp = NULL;
+
+	if (!prop || !str || !str[0])
+		return false;
+
+	while ((cp = of_prop_next_string(prop, cp)) != NULL)
+		if (!strcasecmp(cp, str))
+			return true;
+
+	return false;
+}
+
+static struct device_node *
+mt76_find_power_limits_node(struct mt76_dev *dev)
+{
+	struct device_node *np = dev->dev->of_node;
+	const char *const region_names[] = {
+		[NL80211_DFS_ETSI] = "etsi",
+		[NL80211_DFS_FCC] = "fcc",
+		[NL80211_DFS_JP] = "jp",
+	};
+	struct device_node *cur, *fallback = NULL;
+	const char *region_name = NULL;
+
+	if (dev->region < ARRAY_SIZE(region_names))
+		region_name = region_names[dev->region];
+
+	np = of_get_child_by_name(np, "power-limits");
+	if (!np)
+		return NULL;
+
+	for_each_child_of_node(np, cur) {
+		struct property *country = of_find_property(cur, "country", NULL);
+		struct property *regd = of_find_property(cur, "regdomain", NULL);
+
+		if (!country && !regd) {
+			fallback = cur;
+			continue;
+		}
+
+		if (mt76_string_prop_find(country, dev->alpha2) ||
+		    mt76_string_prop_find(regd, region_name))
+			return cur;
+	}
+
+	return fallback;
+}
+
+static const __be32 *
+mt76_get_of_array(struct device_node *np, char *name, size_t *len, int min)
+{
+	struct property *prop = of_find_property(np, name, NULL);
+
+	if (!prop || !prop->value || prop->length < min * 4)
+		return NULL;
+
+	*len = prop->length;
+
+	return prop->value;
+}
+
+static struct device_node *
+mt76_find_channel_node(struct device_node *np, struct ieee80211_channel *chan)
+{
+	struct device_node *cur;
+	const __be32 *val;
+	size_t len;
+
+	for_each_child_of_node(np, cur) {
+		val = mt76_get_of_array(cur, "channels", &len, 2);
+		if (!val)
+			continue;
+
+		while (len >= 2 * sizeof(*val)) {
+			if (chan->hw_value >= be32_to_cpu(val[0]) &&
+			    chan->hw_value <= be32_to_cpu(val[1]))
+				return cur;
+
+			val += 2;
+			len -= 2 * sizeof(*val);
+		}
+	}
+
+	return NULL;
+}
+
+static s8
+mt76_get_txs_delta(struct device_node *np, u8 nss)
+{
+	const __be32 *val;
+	size_t len;
+
+	val = mt76_get_of_array(np, "txs-delta", &len, nss);
+	if (!val)
+		return 0;
+
+	return be32_to_cpu(val[nss - 1]);
+}
+
+static void
+mt76_apply_array_limit(s8 *pwr, size_t pwr_len, const __be32 *data,
+		       s8 target_power, s8 nss_delta, s8 *max_power)
+{
+	int i;
+
+	if (!data)
+		return;
+
+	for (i = 0; i < pwr_len; i++) {
+		pwr[i] = min_t(s8, target_power,
+			       be32_to_cpu(data[i]) + nss_delta);
+		*max_power = max(*max_power, pwr[i]);
+	}
+}
+
+static void
+mt76_apply_multi_array_limit(s8 *pwr, size_t pwr_len, s8 pwr_num,
+			     const __be32 *data, size_t len, s8 target_power,
+			     s8 nss_delta, s8 *max_power)
+{
+	int i, cur;
+
+	if (!data)
+		return;
+
+	len /= 4;
+	cur = be32_to_cpu(data[0]);
+	for (i = 0; i < pwr_num; i++) {
+		if (len < pwr_len + 1)
+			break;
+
+		mt76_apply_array_limit(pwr + pwr_len * i, pwr_len, data + 1,
+				       target_power, nss_delta, max_power);
+		if (--cur > 0)
+			continue;
+
+		data += pwr_len + 1;
+		len -= pwr_len + 1;
+		if (!len)
+			break;
+
+		cur = be32_to_cpu(data[0]);
+	}
+}
+
+s8 mt76_get_rate_power_limits(struct mt76_phy *phy,
+			      struct ieee80211_channel *chan,
+			      struct mt76_power_limits *dest,
+			      s8 target_power)
+{
+	struct mt76_dev *dev = phy->dev;
+	struct device_node *np;
+	const __be32 *val;
+	char name[16];
+	u32 mcs_rates = dev->drv->mcs_rates;
+	u32 ru_rates = ARRAY_SIZE(dest->ru[0]);
+	char band;
+	size_t len;
+	s8 max_power = 0;
+	s8 txs_delta;
+
+	if (!mcs_rates)
+		mcs_rates = 10;
+
+	memset(dest, target_power, sizeof(*dest));
+
+	if (!IS_ENABLED(CONFIG_OF))
+		return target_power;
+
+	np = mt76_find_power_limits_node(dev);
+	if (!np)
+		return target_power;
+
+	switch (chan->band) {
+	case NL80211_BAND_2GHZ:
+		band = '2';
+		break;
+	case NL80211_BAND_5GHZ:
+		band = '5';
+		break;
+	default:
+		return target_power;
+	}
+
+	snprintf(name, sizeof(name), "txpower-%cg", band);
+	np = of_get_child_by_name(np, name);
+	if (!np)
+		return target_power;
+
+	np = mt76_find_channel_node(np, chan);
+	if (!np)
+		return target_power;
+
+	txs_delta = mt76_get_txs_delta(np, hweight8(phy->antenna_mask));
+
+	val = mt76_get_of_array(np, "rates-cck", &len, ARRAY_SIZE(dest->cck));
+	mt76_apply_array_limit(dest->cck, ARRAY_SIZE(dest->cck), val,
+			       target_power, txs_delta, &max_power);
+
+	val = mt76_get_of_array(np, "rates-ofdm",
+				&len, ARRAY_SIZE(dest->ofdm));
+	mt76_apply_array_limit(dest->ofdm, ARRAY_SIZE(dest->ofdm), val,
+			       target_power, txs_delta, &max_power);
+
+	val = mt76_get_of_array(np, "rates-mcs", &len, mcs_rates + 1);
+	mt76_apply_multi_array_limit(dest->mcs[0], ARRAY_SIZE(dest->mcs[0]),
+				     ARRAY_SIZE(dest->mcs), val, len,
+				     target_power, txs_delta, &max_power);
+
+	val = mt76_get_of_array(np, "rates-ru", &len, ru_rates + 1);
+	mt76_apply_multi_array_limit(dest->ru[0], ARRAY_SIZE(dest->ru[0]),
+				     ARRAY_SIZE(dest->ru), val, len,
+				     target_power, txs_delta, &max_power);
+
+	return max_power;
+}
+EXPORT_SYMBOL_GPL(mt76_get_rate_power_limits);
+
 int
 mt76_eeprom_init(struct mt76_dev *dev, int len)
 {
@@ -119,6 +331,6 @@ mt76_eeprom_init(struct mt76_dev *dev, int len)
 	if (!dev->eeprom.data)
 		return -ENOMEM;
 
-	return !mt76_get_of_eeprom(dev, len);
+	return !mt76_get_of_eeprom(dev, dev->eeprom.data, 0, len);
 }
 EXPORT_SYMBOL_GPL(mt76_eeprom_init);