rtw88: new Realtek 802.11ac driver

This is a new mac80211 driver for Realtek 802.11ac wireless network chips.
rtw88 now supports RTL8822BE/RTL8822CE now, with basic station mode
functionalities. The firmware for both can be found at linux-firmware.

https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
For RTL8822BE: rtw88/rtw8822b_fw.bin
For RTL8822CE: rtw88/rtw8822c_fw.bin

And for now, only PCI buses (RTL8xxxE) are supported. We will add support
for USB and SDIO in the future. The bus interface abstraction can be seen
in this driver such as hci.h. Most of the hardware setting are the same
except for some TRX path or probing setup should be separated.

Supported:

 * Basic STA/AP/ADHOC mode, and TDLS (STA is well tested)

Missing feature:

 * WOW/PNO
 * USB & SDIO bus (such as RTL8xxxU/RTL8xxxS)
 * BT coexistence (8822B/8822C are combo ICs)
 * Multiple interfaces (for now single STA is better supported)
 * Dynamic hardware calibrations (to improve/stabilize performance)

Potential problems:

 * static calibration spends too much time, and it is painful for
   driver to leave IDLE state. And slows down associate process.
   But reload function are under development, will be added soon!
 * TRX statictics misleading, as we are not reporting status correctly,
   or say, not reporting for "every" packet.

The next patch set should have BT coexistence code since RTL8822B/C are
combo ICs, and the driver for BT can be found after Linux Kernel v4.20.
So it is better to add it first to make WiFi + BT work concurrently.

Although now rtw88 is simple but we are developing more features for it.
Even we want to add support for more chips such as RTL8821C/RTL8814B.

Finally, rtw88 has many authors, listed alphabetically:

Ping-Ke Shih <pkshih@realtek.com>
Tzu-En Huang <tehuang@realtek.com>
Yan-Hsuan Chuang <yhchuang@realtek.com>

Reviewed-by: Stanislaw Gruszka <sgruszka@redhat.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Tested-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 166 insertions, 0 deletions

diff --git a/drivers/net/wireless/realtek/rtw88/ps.c b/drivers/net/wireless/realtek/rtw88/ps.c
new file mode 100644
index 000000000000..607bfa4317d9
--- /dev/null
+++ b/drivers/net/wireless/realtek/rtw88/ps.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/* Copyright(c) 2018-2019  Realtek Corporation
+ */
+
+#include "main.h"
+#include "fw.h"
+#include "ps.h"
+#include "mac.h"
+#include "debug.h"
+
+static int rtw_ips_pwr_up(struct rtw_dev *rtwdev)
+{
+	int ret;
+
+	ret = rtw_core_start(rtwdev);
+	if (ret)
+		rtw_err(rtwdev, "leave idle state failed\n");
+
+	rtw_set_channel(rtwdev);
+	rtw_flag_clear(rtwdev, RTW_FLAG_INACTIVE_PS);
+
+	return ret;
+}
+
+int rtw_enter_ips(struct rtw_dev *rtwdev)
+{
+	rtw_flag_set(rtwdev, RTW_FLAG_INACTIVE_PS);
+
+	rtw_core_stop(rtwdev);
+
+	return 0;
+}
+
+static void rtw_restore_port_cfg_iter(void *data, u8 *mac,
+				      struct ieee80211_vif *vif)
+{
+	struct rtw_dev *rtwdev = data;
+	struct rtw_vif *rtwvif = (struct rtw_vif *)vif->drv_priv;
+	u32 config = ~0;
+
+	rtw_vif_port_config(rtwdev, rtwvif, config);
+}
+
+int rtw_leave_ips(struct rtw_dev *rtwdev)
+{
+	int ret;
+
+	ret = rtw_ips_pwr_up(rtwdev);
+	if (ret) {
+		rtw_err(rtwdev, "failed to leave ips state\n");
+		return ret;
+	}
+
+	rtw_iterate_vifs_atomic(rtwdev, rtw_restore_port_cfg_iter, rtwdev);
+
+	return 0;
+}
+
+static void rtw_leave_lps_core(struct rtw_dev *rtwdev)
+{
+	struct rtw_lps_conf *conf = &rtwdev->lps_conf;
+
+	conf->state = RTW_ALL_ON;
+	conf->awake_interval = 1;
+	conf->rlbm = 0;
+	conf->smart_ps = 0;
+
+	rtw_fw_set_pwr_mode(rtwdev);
+	rtw_flag_clear(rtwdev, RTW_FLAG_LEISURE_PS);
+}
+
+static void rtw_enter_lps_core(struct rtw_dev *rtwdev)
+{
+	struct rtw_lps_conf *conf = &rtwdev->lps_conf;
+
+	conf->state = RTW_RF_OFF;
+	conf->awake_interval = 1;
+	conf->rlbm = 1;
+	conf->smart_ps = 2;
+
+	rtw_fw_set_pwr_mode(rtwdev);
+	rtw_flag_set(rtwdev, RTW_FLAG_LEISURE_PS);
+}
+
+void rtw_lps_work(struct work_struct *work)
+{
+	struct rtw_dev *rtwdev = container_of(work, struct rtw_dev,
+					      lps_work.work);
+	struct rtw_lps_conf *conf = &rtwdev->lps_conf;
+	struct rtw_vif *rtwvif = conf->rtwvif;
+
+	if (WARN_ON(!rtwvif))
+		return;
+
+	if (conf->mode == RTW_MODE_LPS)
+		rtw_enter_lps_core(rtwdev);
+	else
+		rtw_leave_lps_core(rtwdev);
+}
+
+void rtw_enter_lps_irqsafe(struct rtw_dev *rtwdev, struct rtw_vif *rtwvif)
+{
+	struct rtw_lps_conf *conf = &rtwdev->lps_conf;
+
+	if (rtwvif->in_lps)
+		return;
+
+	conf->mode = RTW_MODE_LPS;
+	conf->rtwvif = rtwvif;
+	rtwvif->in_lps = true;
+
+	ieee80211_queue_delayed_work(rtwdev->hw, &rtwdev->lps_work, 0);
+}
+
+void rtw_leave_lps_irqsafe(struct rtw_dev *rtwdev, struct rtw_vif *rtwvif)
+{
+	struct rtw_lps_conf *conf = &rtwdev->lps_conf;
+
+	if (!rtwvif->in_lps)
+		return;
+
+	conf->mode = RTW_MODE_ACTIVE;
+	conf->rtwvif = rtwvif;
+	rtwvif->in_lps = false;
+
+	ieee80211_queue_delayed_work(rtwdev->hw, &rtwdev->lps_work, 0);
+}
+
+bool rtw_in_lps(struct rtw_dev *rtwdev)
+{
+	return rtw_flag_check(rtwdev, RTW_FLAG_LEISURE_PS);
+}
+
+void rtw_enter_lps(struct rtw_dev *rtwdev, struct rtw_vif *rtwvif)
+{
+	struct rtw_lps_conf *conf = &rtwdev->lps_conf;
+
+	if (WARN_ON(!rtwvif))
+		return;
+
+	if (rtwvif->in_lps)
+		return;
+
+	conf->mode = RTW_MODE_LPS;
+	conf->rtwvif = rtwvif;
+	rtwvif->in_lps = true;
+
+	rtw_enter_lps_core(rtwdev);
+}
+
+void rtw_leave_lps(struct rtw_dev *rtwdev, struct rtw_vif *rtwvif)
+{
+	struct rtw_lps_conf *conf = &rtwdev->lps_conf;
+
+	if (WARN_ON(!rtwvif))
+		return;
+
+	if (!rtwvif->in_lps)
+		return;
+
+	conf->mode = RTW_MODE_ACTIVE;
+	conf->rtwvif = rtwvif;
+	rtwvif->in_lps = false;
+
+	rtw_leave_lps_core(rtwdev);
+}