From:   Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To:     linux-wireless@vger.kernel.org
Cc:     Yan-Hsuan Chuang <tony0620emma@gmail.com>,
        Kalle Valo <kvalo@kernel.org>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        linux-mmc@vger.kernel.org, Chris Morgan <macroalpha82@gmail.com>,
        Nitin Gupta <nitin.gupta981@gmail.com>,
        Neo Jou <neojou@gmail.com>, Pkshih <pkshih@realtek.com>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Subject: [PATCH v2 RFC 3/9] wifi: rtw88: mac: Support SDIO specific bits in the power on sequence
Date:   Fri, 10 Mar 2023 21:29:16 +0100
Message-Id: <20230310202922.2459680-4-martin.blumenstingl@googlemail.com>
In-Reply-To: <20230310202922.2459680-1-martin.blumenstingl@googlemail.com>
References: <20230310202922.2459680-1-martin.blumenstingl@googlemail.com>
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Add the code specific to SDIO HCI in the MAC power on sequence. This is
based on the RTL8822BS and RTL8822CS vendor drivers.

Co-developed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
Changes since v1:
- only access REG_SDIO_HIMR for RTW_HCI_TYPE_SDIO
- use proper BIT_HCI_SUS_REQ, BIT_HCI_RESUME_RDY and BIT_SDIO_PAD_E5
  macros as suggested by Ping-Ke


 drivers/net/wireless/realtek/rtw88/mac.c | 46 +++++++++++++++++++++---
 1 file changed, 42 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/mac.c b/drivers/net/wireless/realtek/rtw88/mac.c
index cfdfc8a2c836..17704394cca3 100644
--- a/drivers/net/wireless/realtek/rtw88/mac.c
+++ b/drivers/net/wireless/realtek/rtw88/mac.c
@@ -7,6 +7,7 @@
 #include "reg.h"
 #include "fw.h"
 #include "debug.h"
+#include "sdio.h"
 
 void rtw_set_channel_mac(struct rtw_dev *rtwdev, u8 channel, u8 bw,
 			 u8 primary_ch_idx)
@@ -60,6 +61,7 @@ EXPORT_SYMBOL(rtw_set_channel_mac);
 
 static int rtw_mac_pre_system_cfg(struct rtw_dev *rtwdev)
 {
+	unsigned int retry;
 	u32 value32;
 	u8 value8;
 
@@ -77,6 +79,28 @@ static int rtw_mac_pre_system_cfg(struct rtw_dev *rtwdev)
 	case RTW_HCI_TYPE_PCIE:
 		rtw_write32_set(rtwdev, REG_HCI_OPT_CTRL, BIT_USB_SUS_DIS);
 		break;
+	case RTW_HCI_TYPE_SDIO:
+		rtw_write8_clr(rtwdev, REG_SDIO_HSUS_CTRL, BIT_HCI_SUS_REQ);
+
+		for (retry = 0; retry < RTW_PWR_POLLING_CNT; retry++) {
+			if (rtw_read8(rtwdev, REG_SDIO_HSUS_CTRL) & BIT_HCI_RESUME_RDY)
+				break;
+
+			usleep_range(10, 50);
+		}
+
+		if (retry == RTW_PWR_POLLING_CNT) {
+			rtw_err(rtwdev, "failed to poll REG_SDIO_HSUS_CTRL[1]");
+			return -ETIMEDOUT;
+		}
+
+		if (rtw_sdio_is_sdio30_supported(rtwdev))
+			rtw_write8_set(rtwdev, REG_HCI_OPT_CTRL + 2,
+				       BIT_SDIO_PAD_E5 >> 16);
+		else
+			rtw_write8_clr(rtwdev, REG_HCI_OPT_CTRL + 2,
+				       BIT_SDIO_PAD_E5 >> 16);
+		break;
 	case RTW_HCI_TYPE_USB:
 		break;
 	default:
@@ -248,6 +272,7 @@ static int rtw_mac_power_switch(struct rtw_dev *rtwdev, bool pwr_on)
 {
 	const struct rtw_chip_info *chip = rtwdev->chip;
 	const struct rtw_pwr_seq_cmd **pwr_seq;
+	u32 imr;
 	u8 rpwm;
 	bool cur_pwr;
 	int ret;
@@ -273,18 +298,24 @@ static int rtw_mac_power_switch(struct rtw_dev *rtwdev, bool pwr_on)
 	if (pwr_on == cur_pwr)
 		return -EALREADY;
 
+	if (rtw_hci_type(rtwdev) == RTW_HCI_TYPE_SDIO) {
+		imr = rtw_read32(rtwdev, REG_SDIO_HIMR);
+		rtw_write32(rtwdev, REG_SDIO_HIMR, 0);
+	}
+
 	if (!pwr_on)
 		clear_bit(RTW_FLAG_POWERON, rtwdev->flags);
 
 	pwr_seq = pwr_on ? chip->pwr_on_seq : chip->pwr_off_seq;
 	ret = rtw_pwr_seq_parser(rtwdev, pwr_seq);
-	if (ret)
-		return ret;
+
+	if (rtw_hci_type(rtwdev) == RTW_HCI_TYPE_SDIO)
+		rtw_write32(rtwdev, REG_SDIO_HIMR, imr);
 
 	if (pwr_on)
 		set_bit(RTW_FLAG_POWERON, rtwdev->flags);
 
-	return 0;
+	return ret;
 }
 
 static int __rtw_mac_init_system_cfg(struct rtw_dev *rtwdev)
@@ -455,6 +486,9 @@ static void download_firmware_reg_backup(struct rtw_dev *rtwdev,
 	rtw_write16(rtwdev, REG_FIFOPAGE_INFO_1, 0x200);
 	rtw_write32(rtwdev, REG_RQPN_CTRL_2, bckp[bckp_idx - 1].val);
 
+	if (rtw_hci_type(rtwdev) == RTW_HCI_TYPE_SDIO)
+		rtw_read32(rtwdev, REG_SDIO_FREE_TXPG);
+
 	/* Disable beacon related functions */
 	tmp = rtw_read8(rtwdev, REG_BCN_CTRL);
 	bckp[bckp_idx].len = 1;
@@ -1067,8 +1101,12 @@ static int txdma_queue_mapping(struct rtw_dev *rtwdev)
 	if (rtw_chip_wcpu_11ac(rtwdev))
 		rtw_write32(rtwdev, REG_H2CQ_CSR, BIT_H2CQ_FULL);
 
-	if (rtw_hci_type(rtwdev) == RTW_HCI_TYPE_USB)
+	if (rtw_hci_type(rtwdev) == RTW_HCI_TYPE_SDIO) {
+		rtw_read32(rtwdev, REG_SDIO_FREE_TXPG);
+		rtw_write32(rtwdev, REG_SDIO_TX_CTRL, 0);
+	} else if (rtw_hci_type(rtwdev) == RTW_HCI_TYPE_USB) {
 		rtw_write8_set(rtwdev, REG_TXDMA_PQ_MAP, BIT_RXDMA_ARBBW_EN);
+	}
 
 	return 0;
 }
-- 
2.39.2