mt76: mt7921: introduce PM support

Introduce suspend/resume and WoW (Wake-on-WoWLAN) support to mt7921
driver to allow remote wakeu-up from the suspend state.

Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Co-developed-by: Soul Huang <Soul.Huang@mediatek.com>
Signed-off-by: Soul Huang <Soul.Huang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 307 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
index 02fde1c63ecf..77055ff812eb 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
@@ -1657,6 +1657,15 @@ out:
 	return ret;
 }
 
+static const struct wiphy_wowlan_support mt7921_wowlan_support = {
+	.flags = WIPHY_WOWLAN_MAGIC_PKT | WIPHY_WOWLAN_DISCONNECT |
+		 WIPHY_WOWLAN_SUPPORTS_GTK_REKEY | WIPHY_WOWLAN_NET_DETECT,
+	.n_patterns = 1,
+	.pattern_min_len = 1,
+	.pattern_max_len = MT7921_WOW_PATTEN_MAX_LEN,
+	.max_nd_match_sets = 10,
+};
+
 static int mt7921_load_firmware(struct mt7921_dev *dev)
 {
 	int ret;
@@ -1684,6 +1693,10 @@ static int mt7921_load_firmware(struct mt7921_dev *dev)
 
 	mt76_queue_tx_cleanup(dev, dev->mt76.q_mcu[MT_MCUQ_FWDL], false);
 
+#ifdef CONFIG_PM
+	dev->mt76.hw->wiphy->wowlan = &mt7921_wowlan_support;
+#endif /* CONFIG_PM */
+
 	dev_err(dev->mt76.dev, "Firmware init done\n");
 
 	return 0;
@@ -2610,3 +2623,297 @@ int mt7921_mcu_set_bss_pm(struct mt7921_dev *dev, struct ieee80211_vif *vif,
 	return mt76_mcu_send_msg(&dev->mt76, MCU_CMD_SET_BSS_CONNECTED, &req,
 				 sizeof(req), false);
 }
+
+#ifdef CONFIG_PM
+int mt7921_mcu_set_hif_suspend(struct mt7921_dev *dev, bool suspend)
+{
+	struct {
+		struct {
+			u8 hif_type; /* 0x0: HIF_SDIO
+				      * 0x1: HIF_USB
+				      * 0x2: HIF_PCIE
+				      */
+			u8 pad[3];
+		} __packed hdr;
+		struct hif_suspend_tlv {
+			__le16 tag;
+			__le16 len;
+			u8 suspend;
+		} __packed hif_suspend;
+	} req = {
+		.hif_suspend = {
+			.tag = cpu_to_le16(0), /* 0: UNI_HIF_CTRL_BASIC */
+			.len = cpu_to_le16(sizeof(struct hif_suspend_tlv)),
+			.suspend = suspend,
+		},
+	};
+
+	if (mt76_is_mmio(&dev->mt76))
+		req.hdr.hif_type = 2;
+	else if (mt76_is_usb(&dev->mt76))
+		req.hdr.hif_type = 1;
+	else if (mt76_is_sdio(&dev->mt76))
+		req.hdr.hif_type = 0;
+
+	return mt76_mcu_send_msg(&dev->mt76, MCU_UNI_CMD_HIF_CTRL, &req,
+				 sizeof(req), true);
+}
+EXPORT_SYMBOL_GPL(mt7921_mcu_set_hif_suspend);
+
+static int
+mt7921_mcu_set_wow_ctrl(struct mt7921_phy *phy, struct ieee80211_vif *vif,
+			bool suspend, struct cfg80211_wowlan *wowlan)
+{
+	struct mt7921_vif *mvif = (struct mt7921_vif *)vif->drv_priv;
+	struct mt7921_dev *dev = phy->dev;
+	struct {
+		struct {
+			u8 bss_idx;
+			u8 pad[3];
+		} __packed hdr;
+		struct mt7921_wow_ctrl_tlv wow_ctrl_tlv;
+		struct mt7921_wow_gpio_param_tlv gpio_tlv;
+	} req = {
+		.hdr = {
+			.bss_idx = mvif->mt76.idx,
+		},
+		.wow_ctrl_tlv = {
+			.tag = cpu_to_le16(UNI_SUSPEND_WOW_CTRL),
+			.len = cpu_to_le16(sizeof(struct mt7921_wow_ctrl_tlv)),
+			.cmd = suspend ? 1 : 2,
+		},
+		.gpio_tlv = {
+			.tag = cpu_to_le16(UNI_SUSPEND_WOW_GPIO_PARAM),
+			.len = cpu_to_le16(sizeof(struct mt7921_wow_gpio_param_tlv)),
+			.gpio_pin = 0xff, /* follow fw about GPIO pin */
+		},
+	};
+
+	if (wowlan->magic_pkt)
+		req.wow_ctrl_tlv.trigger |= BIT(0);
+	if (wowlan->disconnect)
+		req.wow_ctrl_tlv.trigger |= BIT(2);
+	if (wowlan->nd_config) {
+		mt7921_mcu_sched_scan_req(phy, vif, wowlan->nd_config);
+		req.wow_ctrl_tlv.trigger |= BIT(5);
+		mt7921_mcu_sched_scan_enable(phy, vif, suspend);
+	}
+
+	if (mt76_is_mmio(&dev->mt76))
+		req.wow_ctrl_tlv.wakeup_hif = WOW_PCIE;
+	else if (mt76_is_usb(&dev->mt76))
+		req.wow_ctrl_tlv.wakeup_hif = WOW_USB;
+	else if (mt76_is_sdio(&dev->mt76))
+		req.wow_ctrl_tlv.wakeup_hif = WOW_GPIO;
+
+	return mt76_mcu_send_msg(&dev->mt76, MCU_UNI_CMD_SUSPEND, &req,
+				 sizeof(req), true);
+}
+
+static int
+mt7921_mcu_set_wow_pattern(struct mt7921_dev *dev,
+			   struct ieee80211_vif *vif,
+			   u8 index, bool enable,
+			   struct cfg80211_pkt_pattern *pattern)
+{
+	struct mt7921_vif *mvif = (struct mt7921_vif *)vif->drv_priv;
+	struct mt7921_wow_pattern_tlv *ptlv;
+	struct sk_buff *skb;
+	struct req_hdr {
+		u8 bss_idx;
+		u8 pad[3];
+	} __packed hdr = {
+		.bss_idx = mvif->mt76.idx,
+	};
+
+	skb = mt76_mcu_msg_alloc(&dev->mt76, NULL,
+				 sizeof(hdr) + sizeof(*ptlv));
+	if (!skb)
+		return -ENOMEM;
+
+	skb_put_data(skb, &hdr, sizeof(hdr));
+	ptlv = (struct mt7921_wow_pattern_tlv *)skb_put(skb, sizeof(*ptlv));
+	ptlv->tag = cpu_to_le16(UNI_SUSPEND_WOW_PATTERN);
+	ptlv->len = cpu_to_le16(sizeof(*ptlv));
+	ptlv->data_len = pattern->pattern_len;
+	ptlv->enable = enable;
+	ptlv->index = index;
+
+	memcpy(ptlv->pattern, pattern->pattern, pattern->pattern_len);
+	memcpy(ptlv->mask, pattern->mask, pattern->pattern_len / 8);
+
+	return mt76_mcu_skb_send_msg(&dev->mt76, skb, MCU_UNI_CMD_SUSPEND,
+				     true);
+}
+
+static int
+mt7921_mcu_set_suspend_mode(struct mt7921_dev *dev,
+			    struct ieee80211_vif *vif,
+			    bool enable, u8 mdtim, bool wow_suspend)
+{
+	struct mt7921_vif *mvif = (struct mt7921_vif *)vif->drv_priv;
+	struct {
+		struct {
+			u8 bss_idx;
+			u8 pad[3];
+		} __packed hdr;
+		struct mt7921_suspend_tlv suspend_tlv;
+	} req = {
+		.hdr = {
+			.bss_idx = mvif->mt76.idx,
+		},
+		.suspend_tlv = {
+			.tag = cpu_to_le16(UNI_SUSPEND_MODE_SETTING),
+			.len = cpu_to_le16(sizeof(struct mt7921_suspend_tlv)),
+			.enable = enable,
+			.mdtim = mdtim,
+			.wow_suspend = wow_suspend,
+		},
+	};
+
+	return mt76_mcu_send_msg(&dev->mt76, MCU_UNI_CMD_SUSPEND, &req,
+				 sizeof(req), true);
+}
+
+static int
+mt7921_mcu_set_gtk_rekey(struct mt7921_dev *dev,
+			 struct ieee80211_vif *vif,
+			 bool suspend)
+{
+	struct mt7921_vif *mvif = (struct mt7921_vif *)vif->drv_priv;
+	struct {
+		struct {
+			u8 bss_idx;
+			u8 pad[3];
+		} __packed hdr;
+		struct mt7921_gtk_rekey_tlv gtk_tlv;
+	} __packed req = {
+		.hdr = {
+			.bss_idx = mvif->mt76.idx,
+		},
+		.gtk_tlv = {
+			.tag = cpu_to_le16(UNI_OFFLOAD_OFFLOAD_GTK_REKEY),
+			.len = cpu_to_le16(sizeof(struct mt7921_gtk_rekey_tlv)),
+			.rekey_mode = !suspend,
+		},
+	};
+
+	return mt76_mcu_send_msg(&dev->mt76, MCU_UNI_CMD_OFFLOAD, &req,
+				 sizeof(req), true);
+}
+
+static int
+mt7921_mcu_set_arp_filter(struct mt7921_dev *dev, struct ieee80211_vif *vif,
+			  bool suspend)
+{
+	struct mt7921_vif *mvif = (struct mt7921_vif *)vif->drv_priv;
+	struct {
+		struct {
+			u8 bss_idx;
+			u8 pad[3];
+		} __packed hdr;
+		struct mt7921_arpns_tlv arpns;
+	} req = {
+		.hdr = {
+			.bss_idx = mvif->mt76.idx,
+		},
+		.arpns = {
+			.tag = cpu_to_le16(UNI_OFFLOAD_OFFLOAD_ARP),
+			.len = cpu_to_le16(sizeof(struct mt7921_arpns_tlv)),
+			.mode = suspend,
+		},
+	};
+
+	return mt76_mcu_send_msg(&dev->mt76, MCU_UNI_CMD_OFFLOAD, &req,
+				 sizeof(req), true);
+}
+
+void mt7921_mcu_set_suspend_iter(void *priv, u8 *mac,
+				 struct ieee80211_vif *vif)
+{
+	struct mt7921_phy *phy = priv;
+	bool suspend = test_bit(MT76_STATE_SUSPEND, &phy->mt76->state);
+	struct ieee80211_hw *hw = phy->mt76->hw;
+	struct cfg80211_wowlan *wowlan = hw->wiphy->wowlan_config;
+	int i;
+
+	mt7921_mcu_set_gtk_rekey(phy->dev, vif, suspend);
+	mt7921_mcu_set_arp_filter(phy->dev, vif, suspend);
+
+	mt7921_mcu_set_suspend_mode(phy->dev, vif, suspend, 1, true);
+
+	for (i = 0; i < wowlan->n_patterns; i++)
+		mt7921_mcu_set_wow_pattern(phy->dev, vif, i, suspend,
+					   &wowlan->patterns[i]);
+	mt7921_mcu_set_wow_ctrl(phy, vif, suspend, wowlan);
+}
+
+static void
+mt7921_mcu_key_iter(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
+		    struct ieee80211_sta *sta, struct ieee80211_key_conf *key,
+		    void *data)
+{
+	struct mt7921_gtk_rekey_tlv *gtk_tlv = data;
+	u32 cipher;
+
+	if (key->cipher != WLAN_CIPHER_SUITE_AES_CMAC &&
+	    key->cipher != WLAN_CIPHER_SUITE_CCMP &&
+	    key->cipher != WLAN_CIPHER_SUITE_TKIP)
+		return;
+
+	if (key->cipher == WLAN_CIPHER_SUITE_TKIP) {
+		gtk_tlv->proto = cpu_to_le32(NL80211_WPA_VERSION_1);
+		cipher = BIT(3);
+	} else {
+		gtk_tlv->proto = cpu_to_le32(NL80211_WPA_VERSION_2);
+		cipher = BIT(4);
+	}
+
+	/* we are assuming here to have a single pairwise key */
+	if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE) {
+		gtk_tlv->pairwise_cipher = cpu_to_le32(cipher);
+		gtk_tlv->group_cipher = cpu_to_le32(cipher);
+		gtk_tlv->keyid = key->keyidx;
+	}
+}
+
+int mt7921_mcu_update_gtk_rekey(struct ieee80211_hw *hw,
+				struct ieee80211_vif *vif,
+				struct cfg80211_gtk_rekey_data *key)
+{
+	struct mt7921_vif *mvif = (struct mt7921_vif *)vif->drv_priv;
+	struct mt7921_dev *dev = mt7921_hw_dev(hw);
+	struct mt7921_gtk_rekey_tlv *gtk_tlv;
+	struct sk_buff *skb;
+	struct {
+		u8 bss_idx;
+		u8 pad[3];
+	} __packed hdr = {
+		.bss_idx = mvif->mt76.idx,
+	};
+
+	skb = mt76_mcu_msg_alloc(&dev->mt76, NULL,
+				 sizeof(hdr) + sizeof(*gtk_tlv));
+	if (!skb)
+		return -ENOMEM;
+
+	skb_put_data(skb, &hdr, sizeof(hdr));
+	gtk_tlv = (struct mt7921_gtk_rekey_tlv *)skb_put(skb,
+							 sizeof(*gtk_tlv));
+	gtk_tlv->tag = cpu_to_le16(UNI_OFFLOAD_OFFLOAD_GTK_REKEY);
+	gtk_tlv->len = cpu_to_le16(sizeof(*gtk_tlv));
+	gtk_tlv->rekey_mode = 2;
+	gtk_tlv->option = 1;
+
+	rcu_read_lock();
+	ieee80211_iter_keys_rcu(hw, vif, mt7921_mcu_key_iter, gtk_tlv);
+	rcu_read_unlock();
+
+	memcpy(gtk_tlv->kek, key->kek, NL80211_KEK_LEN);
+	memcpy(gtk_tlv->kck, key->kck, NL80211_KCK_LEN);
+	memcpy(gtk_tlv->replay_ctr, key->replay_ctr, NL80211_REPLAY_CTR_LEN);
+
+	return mt76_mcu_skb_send_msg(&dev->mt76, skb, MCU_UNI_CMD_OFFLOAD,
+				     true);
+}
+#endif /* CONFIG_PM */