rtw89: add Realtek 802.11ax driver

This driver named rtw89, which is the next generation of rtw88, supports
Realtek 8852AE 802.11ax 2x2 chip whose new features are OFDMA, DBCC,
Spatial reuse, TWT and BSS coloring; now some of them aren't implemented
though.

The chip architecture is entirely different from the chips supported by
rtw88 like RTL8822CE 802.11ac chip. First of all, register address ranges
are totally redefined, so it's impossible to reuse register definition. To
communicate with firmware, new H2C/C2H format is proposed. In order to have
better utilization, TX DMA flow is changed to two stages DMA. To provide
rich RX status information, additional RX PPDU packets are added.

Since there are so many differences mentioned above, we decide to propose
a new driver. It has many authors, they are listed in alphabetic order:

Chin-Yen Lee <timlee@realtek.com>
Ping-Ke Shih <pkshih@realtek.com>
Po Hao Huang <phhuang@realtek.com>
Tzu-En Huang <tehuang@realtek.com>
Vincent Fann <vincent_fann@realtek.com>
Yan-Hsuan Chuang <tony0620emma@gmail.com>
Zong-Zhe Yang <kevin_yang@realtek.com>

Tested-by: Aaron Ma <aaron.ma@canonical.com>
Tested-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20211008035627.19463-1-pkshih@realtek.com

1 files changed, 150 insertions, 0 deletions

diff --git a/drivers/net/wireless/realtek/rtw89/ps.c b/drivers/net/wireless/realtek/rtw89/ps.c
new file mode 100644
index 000000000000..7eaa01e41ef2
--- /dev/null
+++ b/drivers/net/wireless/realtek/rtw89/ps.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/* Copyright(c) 2019-2020  Realtek Corporation
+ */
+
+#include "coex.h"
+#include "core.h"
+#include "debug.h"
+#include "fw.h"
+#include "mac.h"
+#include "ps.h"
+#include "reg.h"
+#include "util.h"
+
+static int rtw89_fw_leave_lps_check(struct rtw89_dev *rtwdev, u8 macid)
+{
+	u32 pwr_en_bit = 0xE;
+	u32 chk_msk = pwr_en_bit << (4 * macid);
+	u32 polling;
+	int ret;
+
+	ret = read_poll_timeout_atomic(rtw89_read32_mask, polling, !polling,
+				       1000, 50000, false, rtwdev,
+				       R_AX_PPWRBIT_SETTING, chk_msk);
+	if (ret) {
+		rtw89_info(rtwdev, "rtw89: failed to leave lps state\n");
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static void __rtw89_enter_ps_mode(struct rtw89_dev *rtwdev)
+{
+	if (!rtwdev->ps_mode)
+		return;
+
+	if (test_and_set_bit(RTW89_FLAG_LOW_POWER_MODE, rtwdev->flags))
+		return;
+
+	rtw89_mac_power_mode_change(rtwdev, true);
+}
+
+void __rtw89_leave_ps_mode(struct rtw89_dev *rtwdev)
+{
+	if (!rtwdev->ps_mode)
+		return;
+
+	if (test_and_clear_bit(RTW89_FLAG_LOW_POWER_MODE, rtwdev->flags))
+		rtw89_mac_power_mode_change(rtwdev, false);
+}
+
+static void __rtw89_enter_lps(struct rtw89_dev *rtwdev, u8 mac_id)
+{
+	struct rtw89_lps_parm lps_param = {
+		.macid = mac_id,
+		.psmode = RTW89_MAC_AX_PS_MODE_LEGACY,
+		.lastrpwm = RTW89_LAST_RPWM_PS,
+	};
+
+	rtw89_btc_ntfy_radio_state(rtwdev, BTC_RFCTRL_FW_CTRL);
+	rtw89_fw_h2c_lps_parm(rtwdev, &lps_param);
+}
+
+static void __rtw89_leave_lps(struct rtw89_dev *rtwdev, u8 mac_id)
+{
+	struct rtw89_lps_parm lps_param = {
+		.macid = mac_id,
+		.psmode = RTW89_MAC_AX_PS_MODE_ACTIVE,
+		.lastrpwm = RTW89_LAST_RPWM_ACTIVE,
+	};
+
+	rtw89_fw_h2c_lps_parm(rtwdev, &lps_param);
+	rtw89_fw_leave_lps_check(rtwdev, 0);
+	rtw89_btc_ntfy_radio_state(rtwdev, BTC_RFCTRL_WL_ON);
+}
+
+void rtw89_leave_ps_mode(struct rtw89_dev *rtwdev)
+{
+	lockdep_assert_held(&rtwdev->mutex);
+
+	__rtw89_leave_ps_mode(rtwdev);
+}
+
+void rtw89_enter_lps(struct rtw89_dev *rtwdev, u8 mac_id)
+{
+	lockdep_assert_held(&rtwdev->mutex);
+
+	if (test_and_set_bit(RTW89_FLAG_LEISURE_PS, rtwdev->flags))
+		return;
+
+	__rtw89_enter_lps(rtwdev, mac_id);
+	__rtw89_enter_ps_mode(rtwdev);
+}
+
+static void rtw89_leave_lps_vif(struct rtw89_dev *rtwdev, struct rtw89_vif *rtwvif)
+{
+	if (rtwvif->wifi_role != RTW89_WIFI_ROLE_STATION)
+		return;
+
+	__rtw89_leave_ps_mode(rtwdev);
+	__rtw89_leave_lps(rtwdev, rtwvif->mac_id);
+}
+
+void rtw89_leave_lps(struct rtw89_dev *rtwdev)
+{
+	struct rtw89_vif *rtwvif;
+
+	lockdep_assert_held(&rtwdev->mutex);
+
+	if (!test_and_clear_bit(RTW89_FLAG_LEISURE_PS, rtwdev->flags))
+		return;
+
+	rtw89_for_each_rtwvif(rtwdev, rtwvif)
+		rtw89_leave_lps_vif(rtwdev, rtwvif);
+}
+
+void rtw89_enter_ips(struct rtw89_dev *rtwdev)
+{
+	struct rtw89_vif *rtwvif;
+
+	set_bit(RTW89_FLAG_INACTIVE_PS, rtwdev->flags);
+
+	rtw89_for_each_rtwvif(rtwdev, rtwvif)
+		rtw89_mac_vif_deinit(rtwdev, rtwvif);
+
+	rtw89_core_stop(rtwdev);
+}
+
+void rtw89_leave_ips(struct rtw89_dev *rtwdev)
+{
+	struct rtw89_vif *rtwvif;
+	int ret;
+
+	ret = rtw89_core_start(rtwdev);
+	if (ret)
+		rtw89_err(rtwdev, "failed to leave idle state\n");
+
+	rtw89_set_channel(rtwdev);
+
+	rtw89_for_each_rtwvif(rtwdev, rtwvif)
+		rtw89_mac_vif_init(rtwdev, rtwvif);
+
+	clear_bit(RTW89_FLAG_INACTIVE_PS, rtwdev->flags);
+}
+
+void rtw89_set_coex_ctrl_lps(struct rtw89_dev *rtwdev, bool btc_ctrl)
+{
+	if (btc_ctrl)
+		rtw89_leave_lps(rtwdev);
+}