| // SPDX-License-Identifier: ISC |
| /* |
| * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name> |
| */ |
| #include <linux/of.h> |
| #include <linux/of_net.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/mtd/partitions.h> |
| #include <linux/etherdevice.h> |
| #include "mt76.h" |
| |
| 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; |
| struct mtd_info *mtd; |
| const __be32 *list; |
| const char *part; |
| phandle phandle; |
| int size; |
| size_t retlen; |
| int ret; |
| |
| if (!np) |
| return -ENOENT; |
| |
| list = of_get_property(np, "mediatek,mtd-eeprom", &size); |
| if (!list) |
| return -ENOENT; |
| |
| phandle = be32_to_cpup(list++); |
| if (!phandle) |
| return -ENOENT; |
| |
| np = of_find_node_by_phandle(phandle); |
| if (!np) |
| return -EINVAL; |
| |
| part = of_get_property(np, "label", NULL); |
| if (!part) |
| part = np->name; |
| |
| mtd = get_mtd_device_nm(part); |
| if (IS_ERR(mtd)) { |
| ret = PTR_ERR(mtd); |
| goto out_put_node; |
| } |
| |
| if (size <= sizeof(*list)) { |
| ret = -EINVAL; |
| goto out_put_node; |
| } |
| |
| offset += be32_to_cpup(list); |
| ret = mtd_read(mtd, offset, len, &retlen, eep); |
| put_mtd_device(mtd); |
| if (ret) |
| goto out_put_node; |
| |
| if (retlen < len) { |
| ret = -EINVAL; |
| goto out_put_node; |
| } |
| |
| if (of_property_read_bool(dev->dev->of_node, "big-endian")) { |
| u8 *data = (u8 *)eep; |
| int i; |
| |
| /* convert eeprom data in Little Endian */ |
| for (i = 0; i < round_down(len, 2); i += 2) |
| put_unaligned_le16(get_unaligned_be16(&data[i]), |
| &data[i]); |
| } |
| |
| #ifdef CONFIG_NL80211_TESTMODE |
| dev->test_mtd.name = devm_kstrdup(dev->dev, part, GFP_KERNEL); |
| dev->test_mtd.offset = offset; |
| #endif |
| |
| out_put_node: |
| of_node_put(np); |
| return ret; |
| #else |
| return -ENOENT; |
| #endif |
| } |
| EXPORT_SYMBOL_GPL(mt76_get_of_eeprom); |
| |
| void |
| mt76_eeprom_override(struct mt76_phy *phy) |
| { |
| struct mt76_dev *dev = phy->dev; |
| struct device_node *np = dev->dev->of_node; |
| |
| of_get_mac_address(np, phy->macaddr); |
| |
| if (!is_valid_ether_addr(phy->macaddr)) { |
| eth_random_addr(phy->macaddr); |
| dev_info(dev->dev, |
| "Invalid MAC address, using random address %pM\n", |
| phy->macaddr); |
| } |
| } |
| 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)) { |
| of_node_put(np); |
| return cur; |
| } |
| } |
| |
| of_node_put(np); |
| 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) |
| { |
| dev->eeprom.size = len; |
| dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL); |
| if (!dev->eeprom.data) |
| return -ENOMEM; |
| |
| return !mt76_get_of_eeprom(dev, dev->eeprom.data, 0, len); |
| } |
| EXPORT_SYMBOL_GPL(mt76_eeprom_init); |