netdev - [PATCH v2 RFC 3/9] wifi: rtw88: mac: Support SDIO specific bits in the power on sequence

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Message-Id: <20230310202922.2459680-4-martin.blumenstingl@googlemail.com>
Date:   Fri, 10 Mar 2023 21:29:16 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     linux-wireless@...r.kernel.org
Cc:     Yan-Hsuan Chuang <tony0620emma@...il.com>,
        Kalle Valo <kvalo@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-mmc@...r.kernel.org, Chris Morgan <macroalpha82@...il.com>,
        Nitin Gupta <nitin.gupta981@...il.com>,
        Neo Jou <neojou@...il.com>, Pkshih <pkshih@...ltek.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH v2 RFC 3/9] wifi: rtw88: mac: Support SDIO specific bits in the power on sequence

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@...il.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.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