drivers/staging/rtlwifi/cam.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /******************************************************************************
  *
  * Copyright(c) 2009-2012  Realtek Corporation.
  *
  * Contact Information:
  * wlanfae <wlanfae@realtek.com>
  * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
  * Hsinchu 300, Taiwan.
  *
  * Larry Finger <Larry.Finger@lwfinger.net>
  *
  *****************************************************************************/
 #include "wifi.h"
 #include "cam.h"
 #include <linux/export.h>

 void rtl_cam_reset_sec_info(struct ieee80211_hw *hw)
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);

 	rtlpriv->sec.use_defaultkey = false;
 	rtlpriv->sec.pairwise_enc_algorithm = NO_ENCRYPTION;
 	rtlpriv->sec.group_enc_algorithm = NO_ENCRYPTION;
 	memset(rtlpriv->sec.key_buf, 0, KEY_BUF_SIZE * MAX_KEY_LEN);
 	memset(rtlpriv->sec.key_len, 0, KEY_BUF_SIZE);
 	rtlpriv->sec.pairwise_key = NULL;
 }

 static void rtl_cam_program_entry(struct ieee80211_hw *hw, u32 entry_no,
 				  u8 *mac_addr, u8 *key_cont_128, u16 us_config)
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);

 	u32 target_command;
 	u32 target_content = 0;
 	int entry_i;

 	RT_PRINT_DATA(rtlpriv, COMP_SEC, DBG_DMESG, "Key content :",
 		      key_cont_128, 16);

 	/* 0-1 config + mac, 2-5 fill 128key,6-7 are reserved */
 	for (entry_i = CAM_CONTENT_COUNT - 1; entry_i >= 0; entry_i--) {
 		target_command = entry_i + CAM_CONTENT_COUNT * entry_no;
 		target_command = target_command | BIT(31) | BIT(16);

 		if (entry_i == 0) {
 			target_content = (u32)(*(mac_addr + 0)) << 16 |
 					 (u32)(*(mac_addr + 1)) << 24 |
 					 (u32)us_config;

 			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
 					target_content);
 			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
 					target_command);

 			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 				 "WRITE %x: %x\n",
 				 rtlpriv->cfg->maps[WCAMI], target_content);
 			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 				 "The Key ID is %d\n", entry_no);
 			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 				 "WRITE %x: %x\n",
 				 rtlpriv->cfg->maps[RWCAM], target_command);

 		} else if (entry_i == 1) {
 			target_content = (u32)(*(mac_addr + 5)) << 24 |
 					 (u32)(*(mac_addr + 4)) << 16 |
 					 (u32)(*(mac_addr + 3)) << 8 |
 					 (u32)(*(mac_addr + 2));

 			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
 					target_content);
 			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
 					target_command);

 			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 				 "WRITE A4: %x\n", target_content);
 			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 				 "WRITE A0: %x\n", target_command);
 		} else {
 			target_content =
 			    (u32)(*(key_cont_128 + (entry_i * 4 - 8) + 3)) <<
 			    24 | (u32)(*(key_cont_128 + (entry_i * 4 - 8) + 2))
 			    << 16 |
 			    (u32)(*(key_cont_128 + (entry_i * 4 - 8) + 1)) << 8
 			    | (u32)(*(key_cont_128 + (entry_i * 4 - 8) + 0));

 			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
 					target_content);
 			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
 					target_command);

 			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 				 "WRITE A4: %x\n", target_content);
 			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 				 "WRITE A0: %x\n", target_command);
 		}
 	}

 	RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 		 "after set key, usconfig:%x\n", us_config);
 }

 u8 rtl_cam_add_one_entry(struct ieee80211_hw *hw, u8 *mac_addr,
 			 u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
 			 u32 ul_default_key, u8 *key_content)
 {
 	u32 us_config;
 	struct rtl_priv *rtlpriv = rtl_priv(hw);

 	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 		 "EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, ulUseDK=%x MacAddr %pM\n",
 		 ul_entry_idx, ul_key_id, ul_enc_alg,
 		 ul_default_key, mac_addr);

 	if (ul_key_id == TOTAL_CAM_ENTRY) {
 		RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
 			 "ulKeyId exceed!\n");
 		return 0;
 	}

 	if (ul_default_key == 1)
 		us_config = CFG_VALID | ((u16)(ul_enc_alg) << 2);
 	else
 		us_config = CFG_VALID | ((ul_enc_alg) << 2) | ul_key_id;

 	rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
 			      (u8 *)key_content, us_config);

 	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "end\n");

 	return 1;
 }

 int rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
 			     u8 *mac_addr, u32 ul_key_id)
 {
 	u32 ul_command;
 	struct rtl_priv *rtlpriv = rtl_priv(hw);

 	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "key_idx:%d\n", ul_key_id);

 	ul_command = ul_key_id * CAM_CONTENT_COUNT;
 	ul_command = ul_command | BIT(31) | BIT(16);

 	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
 	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);

 	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 		 "%s(): WRITE A4: %x\n", __func__, 0);
 	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 		 "%s(): WRITE A0: %x\n", __func__, ul_command);

 	return 0;
 }

 void rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
 {
 	u32 ul_command;
 	struct rtl_priv *rtlpriv = rtl_priv(hw);

 	ul_command = BIT(31) | BIT(30);
 	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
 }

 void rtl_cam_mark_invalid(struct ieee80211_hw *hw, u8 uc_index)
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);

 	u32 ul_command;
 	u32 ul_content;
 	u32 ul_enc_algo;

 	switch (rtlpriv->sec.pairwise_enc_algorithm) {
 	case WEP40_ENCRYPTION:
 		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 		break;
 	case WEP104_ENCRYPTION:
 		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 		break;
 	case TKIP_ENCRYPTION:
 		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 		break;
 	case AESCCMP_ENCRYPTION:
 		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 		break;
 	default:
 		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
 	}

 	ul_content = (uc_index & 3) | ((u16)(ul_enc_algo) << 2);

 	ul_content |= BIT(15);
 	ul_command = CAM_CONTENT_COUNT * uc_index;
 	ul_command = ul_command | BIT(31) | BIT(16);

 	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);

 	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 		 "%s(): WRITE A4: %x\n", __func__, ul_content);
 	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 		 "%s(): WRITE A0: %x\n", __func__, ul_command);
 }

 void rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);

 	u32 ul_command;
 	u32 ul_content;
 	u32 ul_encalgo;
 	u8 entry_i;

 	switch (rtlpriv->sec.pairwise_enc_algorithm) {
 	case WEP40_ENCRYPTION:
 		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
 		break;
 	case WEP104_ENCRYPTION:
 		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
 		break;
 	case TKIP_ENCRYPTION:
 		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
 		break;
 	case AESCCMP_ENCRYPTION:
 		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 		break;
 	default:
 		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
 	}

 	for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
 		if (entry_i == 0) {
 			ul_content =
 			    (uc_index & 0x03) | ((u16)(ul_encalgo) << 2);
 			ul_content |= BIT(15);
 		} else {
 			ul_content = 0;
 		}

 		ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
 		ul_command = ul_command | BIT(31) | BIT(16);

 		rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
 		rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);

 		RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 			 "%s(): WRITE A4: %x\n", __func__, ul_content);
 		RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
 			 "%s(): WRITE A0: %x\n", __func__, ul_command);
 	}
 }

 u8 rtl_cam_get_free_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
 	u8 entry_idx = 0;
 	u8 i, *addr;

 	if (!sta_addr) {
 		pr_err("sta_addr is NULL.\n");
 		return TOTAL_CAM_ENTRY;
 	}
 	/* Does STA already exist? */
 	for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 		addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 		if (ether_addr_equal_unaligned(addr, sta_addr))
 			return i;
 	}
 	/* Get a free CAM entry. */
 	for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
 		if ((bitmap & BIT(0)) == 0) {
 			pr_err("-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
 			       rtlpriv->sec.hwsec_cam_bitmap, entry_idx);
 			rtlpriv->sec.hwsec_cam_bitmap |= BIT(0) << entry_idx;
 			memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
 			       sta_addr, ETH_ALEN);
 			return entry_idx;
 		}
 		bitmap = bitmap >> 1;
 	}
 	return TOTAL_CAM_ENTRY;
 }

 void rtl_cam_del_entry(struct ieee80211_hw *hw, u8 *sta_addr)
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	u32 bitmap;
 	u8 i, *addr;

 	if (!sta_addr) {
 		pr_err("sta_addr is NULL.\n");
 		return;
 	}

 	if (is_zero_ether_addr(sta_addr)) {
 		pr_err("sta_addr is %pM\n", sta_addr);
 		return;
 	}
 	/* Does STA already exist? */
 	for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
 		addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
 		bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
 		if (((bitmap & BIT(0)) == BIT(0)) &&
 		    (ether_addr_equal_unaligned(addr, sta_addr))) {
 			/* Remove from HW Security CAM */
 			eth_zero_addr(rtlpriv->sec.hwsec_cam_sta_addr[i]);
 			rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
 			RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
 				 "&&&&&&&&&del entry %d\n", i);
 		}
 	}
 }
	// SPDX-License-Identifier: GPL-2.0
	/******************************************************************************
	*
	* Copyright(c) 2009-2012 Realtek Corporation.
	*
	* Contact Information:
	* wlanfae <wlanfae@realtek.com>
	* Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
	* Hsinchu 300, Taiwan.
	*
	* Larry Finger <Larry.Finger@lwfinger.net>
	*
	*****************************************************************************/
	#include "wifi.h"
	#include "cam.h"
	#include <linux/export.h>

	void rtl_cam_reset_sec_info(struct ieee80211_hw *hw)
	{
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	rtlpriv->sec.use_defaultkey = false;
	rtlpriv->sec.pairwise_enc_algorithm = NO_ENCRYPTION;
	rtlpriv->sec.group_enc_algorithm = NO_ENCRYPTION;
	memset(rtlpriv->sec.key_buf, 0, KEY_BUF_SIZE * MAX_KEY_LEN);
	memset(rtlpriv->sec.key_len, 0, KEY_BUF_SIZE);
	rtlpriv->sec.pairwise_key = NULL;
	}

	static void rtl_cam_program_entry(struct ieee80211_hw *hw, u32 entry_no,
	u8 mac_addr, u8 key_cont_128, u16 us_config)
	{
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	u32 target_command;
	u32 target_content = 0;
	int entry_i;

	RT_PRINT_DATA(rtlpriv, COMP_SEC, DBG_DMESG, "Key content :",
	key_cont_128, 16);

	/* 0-1 config + mac, 2-5 fill 128key,6-7 are reserved */
	for (entry_i = CAM_CONTENT_COUNT - 1; entry_i >= 0; entry_i--) {
	target_command = entry_i + CAM_CONTENT_COUNT * entry_no;
	target_command = target_command \| BIT(31) \| BIT(16);

	if (entry_i == 0) {
	target_content = (u32)(*(mac_addr + 0)) << 16 \|
	(u32)(*(mac_addr + 1)) << 24 \|
	(u32)us_config;

	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
	target_content);
	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
	target_command);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
	"WRITE %x: %x\n",
	rtlpriv->cfg->maps[WCAMI], target_content);
	RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
	"The Key ID is %d\n", entry_no);
	RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
	"WRITE %x: %x\n",
	rtlpriv->cfg->maps[RWCAM], target_command);

	} else if (entry_i == 1) {
	target_content = (u32)(*(mac_addr + 5)) << 24 \|
	(u32)(*(mac_addr + 4)) << 16 \|
	(u32)(*(mac_addr + 3)) << 8 \|
	(u32)(*(mac_addr + 2));

	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
	target_content);
	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
	target_command);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
	"WRITE A4: %x\n", target_content);
	RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
	"WRITE A0: %x\n", target_command);
	} else {
	target_content =
	(u32)((key_cont_128 + (entry_i 4 - 8) + 3)) <<
	24 \| (u32)((key_cont_128 + (entry_i 4 - 8) + 2))
	<< 16 \|
	(u32)((key_cont_128 + (entry_i 4 - 8) + 1)) << 8
	\| (u32)((key_cont_128 + (entry_i 4 - 8) + 0));

	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
	target_content);
	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
	target_command);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
	"WRITE A4: %x\n", target_content);
	RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
	"WRITE A0: %x\n", target_command);
	}
	}

	RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
	"after set key, usconfig:%x\n", us_config);
	}

	u8 rtl_cam_add_one_entry(struct ieee80211_hw hw, u8 mac_addr,
	u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
	u32 ul_default_key, u8 *key_content)
	{
	u32 us_config;
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
	"EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, ulUseDK=%x MacAddr %pM\n",
	ul_entry_idx, ul_key_id, ul_enc_alg,
	ul_default_key, mac_addr);

	if (ul_key_id == TOTAL_CAM_ENTRY) {
	RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
	"ulKeyId exceed!\n");
	return 0;
	}

	if (ul_default_key == 1)
	us_config = CFG_VALID \| ((u16)(ul_enc_alg) << 2);
	else
	us_config = CFG_VALID \| ((ul_enc_alg) << 2) \| ul_key_id;

	rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
	(u8 *)key_content, us_config);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "end\n");

	return 1;
	}

	int rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
	u8 *mac_addr, u32 ul_key_id)
	{
	u32 ul_command;
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "key_idx:%d\n", ul_key_id);

	ul_command = ul_key_id * CAM_CONTENT_COUNT;
	ul_command = ul_command \| BIT(31) \| BIT(16);

	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
	"%s(): WRITE A4: %x\n", __func__, 0);
	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
	"%s(): WRITE A0: %x\n", __func__, ul_command);

	return 0;
	}

	void rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
	{
	u32 ul_command;
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	ul_command = BIT(31) \| BIT(30);
	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
	}

	void rtl_cam_mark_invalid(struct ieee80211_hw *hw, u8 uc_index)
	{
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	u32 ul_command;
	u32 ul_content;
	u32 ul_enc_algo;

	switch (rtlpriv->sec.pairwise_enc_algorithm) {
	case WEP40_ENCRYPTION:
	ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
	break;
	case WEP104_ENCRYPTION:
	ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
	break;
	case TKIP_ENCRYPTION:
	ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
	break;
	case AESCCMP_ENCRYPTION:
	ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
	break;
	default:
	ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
	}

	ul_content = (uc_index & 3) \| ((u16)(ul_enc_algo) << 2);

	ul_content \|= BIT(15);
	ul_command = CAM_CONTENT_COUNT * uc_index;
	ul_command = ul_command \| BIT(31) \| BIT(16);

	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
	"%s(): WRITE A4: %x\n", __func__, ul_content);
	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
	"%s(): WRITE A0: %x\n", __func__, ul_command);
	}

	void rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
	{
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	u32 ul_command;
	u32 ul_content;
	u32 ul_encalgo;
	u8 entry_i;

	switch (rtlpriv->sec.pairwise_enc_algorithm) {
	case WEP40_ENCRYPTION:
	ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
	break;
	case WEP104_ENCRYPTION:
	ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
	break;
	case TKIP_ENCRYPTION:
	ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
	break;
	case AESCCMP_ENCRYPTION:
	ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
	break;
	default:
	ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
	}

	for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
	if (entry_i == 0) {
	ul_content =
	(uc_index & 0x03) \| ((u16)(ul_encalgo) << 2);
	ul_content \|= BIT(15);
	} else {
	ul_content = 0;
	}

	ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
	ul_command = ul_command \| BIT(31) \| BIT(16);

	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
	"%s(): WRITE A4: %x\n", __func__, ul_content);
	RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
	"%s(): WRITE A0: %x\n", __func__, ul_command);
	}
	}

	u8 rtl_cam_get_free_entry(struct ieee80211_hw hw, u8 sta_addr)
	{
	struct rtl_priv *rtlpriv = rtl_priv(hw);
	u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
	u8 entry_idx = 0;
	u8 i, *addr;

	if (!sta_addr) {
	pr_err("sta_addr is NULL.\n");
	return TOTAL_CAM_ENTRY;
	}
	/* Does STA already exist? */
	for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
	addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
	if (ether_addr_equal_unaligned(addr, sta_addr))
	return i;
	}
	/* Get a free CAM entry. */
	for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
	if ((bitmap & BIT(0)) == 0) {
	pr_err("-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
	rtlpriv->sec.hwsec_cam_bitmap, entry_idx);
	rtlpriv->sec.hwsec_cam_bitmap \|= BIT(0) << entry_idx;
	memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
	sta_addr, ETH_ALEN);
	return entry_idx;
	}
	bitmap = bitmap >> 1;
	}
	return TOTAL_CAM_ENTRY;
	}

	void rtl_cam_del_entry(struct ieee80211_hw hw, u8 sta_addr)
	{
	struct rtl_priv *rtlpriv = rtl_priv(hw);
	u32 bitmap;
	u8 i, *addr;

	if (!sta_addr) {
	pr_err("sta_addr is NULL.\n");
	return;
	}

	if (is_zero_ether_addr(sta_addr)) {
	pr_err("sta_addr is %pM\n", sta_addr);
	return;
	}
	/* Does STA already exist? */
	for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
	addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
	bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
	if (((bitmap & BIT(0)) == BIT(0)) &&
	(ether_addr_equal_unaligned(addr, sta_addr))) {
	/* Remove from HW Security CAM */
	eth_zero_addr(rtlpriv->sec.hwsec_cam_sta_addr[i]);
	rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
	"&&&&&&&&&del entry %d\n", i);
	}
	}
	}