wifi: ath12k: add multiple radio support in a single MAC HW un/register

Currently MAC HW un/register helper function support the single radio.
To enable single/multi link operation in the future, the following helper
functions need to be refactored to accommodate multiple radios under a
single MAC HW un/register:

	* ath12k_ah_to_ar()
	* ath12k_mac_hw_allocate()
	* ath12k_mac_hw_register()
	* ath12k_mac_hw_unregister()

This refactoring will make it easier to scale these functionalities and
support Multi link operation.

                         Current Multi wiphy Model

 +---------------+          +---------------+            +---------------+
 |  Mac80211 hw  |          | Mac80211 hw   |            | Mac80211 hw   |
 |  private data |          | private data  |            | private data  |
 |               |          |               |            |               |
 |ath12k_hw (ah) |          |ath12k_hw (ah) |            |ath12k_hw (ah) |
 |               |          |               |            |               |
 | +-----------+ |          | +-----------+ |            | +-----------+ |
 | | ar (2GHz) | |          | | ar (5GHz) | |            | | ar (6GHz) | |
 | +-----------+ |          | +-----------+ |            | +-----------+ |
 |               |          |               |            |               |
 +---------------+          +---------------+            +---------------+

                           Single wiphy Model

                            +--------------+
                            | Mac80211 hw  |
                            | private data |
                            |              |
                            |ath12k hw (ah)|
                            | +----------+ |
                            | |ar (2GHz) | |
                            | +----------+ |
                            | |ar (5GHz) | |
                            | +----------+ |
                            | |ar (6GHz) | |
                            | +----------+ |
                            +--------------+

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
Signed-off-by: Sriram R <quic_srirrama@quicinc.com>
Signed-off-by: Rameshkumar Sundaram <quic_ramess@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240405194519.1337906-2-quic_ramess@quicinc.com

drivers/net/wireless/ath/ath12k/core.h

@@ -978,13 +978,21 @@ static inline struct ath12k_hw *ath12k_hw_to_ah(struct ieee80211_hw  *hw)
 	return hw->priv;
 }
 
-static inline struct ath12k *ath12k_ah_to_ar(struct ath12k_hw *ah)
+static inline struct ath12k *ath12k_ah_to_ar(struct ath12k_hw *ah, u8 hw_link_id)
 {
-	return ah->radio;
+	if (WARN(hw_link_id >= ah->num_radio,
+		 "bad hw link id %d, so switch to default link\n", hw_link_id))
+		hw_link_id = 0;
+
+	return &ah->radio[hw_link_id];
 }
 
 static inline struct ieee80211_hw *ath12k_ar_to_hw(struct ath12k *ar)
 {
 	return ar->ah->hw;
 }
+
+#define for_each_ar(ah, ar, index) \
+	for ((index) = 0; ((index) < (ah)->num_radio && \
+	     ((ar) = &(ah)->radio[(index)])); (index)++)
 #endif /* _CORE_H_ */

drivers/net/wireless/ath/ath12k/reg.c

@@ -49,7 +49,7 @@ ath12k_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
 	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 	struct ath12k_wmi_init_country_arg arg;
 	struct ath12k_hw *ah = ath12k_hw_to_ah(hw);
-	struct ath12k *ar = ath12k_ah_to_ar(ah);
+	struct ath12k *ar = ath12k_ah_to_ar(ah, 0);
 	int ret;
 
 	ath12k_dbg(ar->ab, ATH12K_DBG_REG,