[PATCH v4 3/9] wifi: rtw88: mac: Support SDIO specific bits in the power on sequence

[Martin Blumenstingl <martin.blumenstingl@googlemail.com>]

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>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
Changes since v3:
- add Ping-Ke's reviewed-by (again, thank you!)

Changes since v2:
- add sdio.h include in patch 2 already (instead of patch 3) as
  suggested by Larry Finger (thank you!) so the build doesn't break
  during bisect
- only set RTW_FLAG_POWERON when applying the power on sequence was
  successful (thanks for the suggestion Ping-Ke!)
- fix smatch false positive "uninitialized symbol 'imr'" in
  rtw_mac_power_switch() by initializing imr to 0. Thanks for spotting
  this and for the suggestion Ping-Ke!

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 | 47 +++++++++++++++++++++---
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/mac.c b/drivers/net/wireless/realtek/rtw88/mac.c
index 2fcba43a6f72..44e07b61b9b9 100644
--- a/drivers/net/wireless/realtek/rtw88/mac.c
+++ b/drivers/net/wireless/realtek/rtw88/mac.c
@@ -61,6 +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;
 
@@ -78,6 +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:
@@ -249,6 +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 = 0;
 	u8 rpwm;
 	bool cur_pwr;
 	int ret;
@@ -274,18 +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 (pwr_on)
+	if (rtw_hci_type(rtwdev) == RTW_HCI_TYPE_SDIO)
+		rtw_write32(rtwdev, REG_SDIO_HIMR, imr);
+
+	if (!ret && pwr_on)
 		set_bit(RTW_FLAG_POWERON, rtwdev->flags);
 
-	return 0;
+	return ret;
 }
 
 static int __rtw_mac_init_system_cfg(struct rtw_dev *rtwdev)
@@ -456,6 +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;
@@ -1068,8 +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;
 }
-- 
2.40.0