mt76: add driver code for MT76x2u based devices

MT76x2u is a 2x2 USB 802.11ac chipset by MediaTek. This driver currently
support station mode

Tested-by: <cug_yangyuancong@hotmail.com>
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 463 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2u_mcu.c b/drivers/net/wireless/mediatek/mt76/mt76x2u_mcu.c
new file mode 100644
index 000000000000..22c16d638baa
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/mt76x2u_mcu.c
@@ -0,0 +1,463 @@
+/*
+ * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/firmware.h>
+
+#include "mt76x2u.h"
+#include "mt76x2_eeprom.h"
+
+#define MT_CMD_HDR_LEN			4
+#define MT_INBAND_PACKET_MAX_LEN	192
+#define MT_MCU_MEMMAP_WLAN		0x410000
+
+#define MCU_FW_URB_MAX_PAYLOAD		0x3900
+#define MCU_ROM_PATCH_MAX_PAYLOAD	2048
+
+#define MT76U_MCU_ILM_OFFSET		0x80000
+#define MT76U_MCU_DLM_OFFSET		0x110000
+#define MT76U_MCU_ROM_PATCH_OFFSET	0x90000
+
+static int
+mt76x2u_mcu_function_select(struct mt76x2_dev *dev, enum mcu_function func,
+			    u32 val)
+{
+	struct {
+		__le32 id;
+		__le32 value;
+	} __packed __aligned(4) msg = {
+		.id = cpu_to_le32(func),
+		.value = cpu_to_le32(val),
+	};
+	struct sk_buff *skb;
+
+	skb = mt76u_mcu_msg_alloc(&msg, sizeof(msg));
+	if (!skb)
+		return -ENOMEM;
+	return mt76u_mcu_send_msg(&dev->mt76, skb, CMD_FUN_SET_OP,
+				  func != Q_SELECT);
+}
+
+int mt76x2u_mcu_set_radio_state(struct mt76x2_dev *dev, bool val)
+{
+	struct {
+		__le32 mode;
+		__le32 level;
+	} __packed __aligned(4) msg = {
+		.mode = cpu_to_le32(val ? RADIO_ON : RADIO_OFF),
+		.level = cpu_to_le32(0),
+	};
+	struct sk_buff *skb;
+
+	skb = mt76u_mcu_msg_alloc(&msg, sizeof(msg));
+	if (!skb)
+		return -ENOMEM;
+	return mt76u_mcu_send_msg(&dev->mt76, skb, CMD_POWER_SAVING_OP,
+				  false);
+}
+
+int mt76x2u_mcu_load_cr(struct mt76x2_dev *dev, u8 type, u8 temp_level,
+			u8 channel)
+{
+	struct {
+		u8 cr_mode;
+		u8 temp;
+		u8 ch;
+		u8 _pad0;
+		__le32 cfg;
+	} __packed __aligned(4) msg = {
+		.cr_mode = type,
+		.temp = temp_level,
+		.ch = channel,
+	};
+	struct sk_buff *skb;
+	u32 val;
+
+	val = BIT(31);
+	val |= (mt76x2_eeprom_get(dev, MT_EE_NIC_CONF_0) >> 8) & 0x00ff;
+	val |= (mt76x2_eeprom_get(dev, MT_EE_NIC_CONF_1) << 8) & 0xff00;
+	msg.cfg = cpu_to_le32(val);
+
+	/* first set the channel without the extension channel info */
+	skb = mt76u_mcu_msg_alloc(&msg, sizeof(msg));
+	if (!skb)
+		return -ENOMEM;
+	return mt76u_mcu_send_msg(&dev->mt76, skb, CMD_LOAD_CR, true);
+}
+
+int mt76x2u_mcu_set_channel(struct mt76x2_dev *dev, u8 channel, u8 bw,
+			    u8 bw_index, bool scan)
+{
+	struct {
+		u8 idx;
+		u8 scan;
+		u8 bw;
+		u8 _pad0;
+
+		__le16 chainmask;
+		u8 ext_chan;
+		u8 _pad1;
+
+	} __packed __aligned(4) msg = {
+		.idx = channel,
+		.scan = scan,
+		.bw = bw,
+		.chainmask = cpu_to_le16(dev->chainmask),
+	};
+	struct sk_buff *skb;
+
+	/* first set the channel without the extension channel info */
+	skb = mt76u_mcu_msg_alloc(&msg, sizeof(msg));
+	if (!skb)
+		return -ENOMEM;
+
+	mt76u_mcu_send_msg(&dev->mt76, skb, CMD_SWITCH_CHANNEL_OP, true);
+
+	usleep_range(5000, 10000);
+
+	msg.ext_chan = 0xe0 + bw_index;
+	skb = mt76u_mcu_msg_alloc(&msg, sizeof(msg));
+	if (!skb)
+		return -ENOMEM;
+
+	return mt76u_mcu_send_msg(&dev->mt76, skb, CMD_SWITCH_CHANNEL_OP, true);
+}
+
+int mt76x2u_mcu_calibrate(struct mt76x2_dev *dev, enum mcu_calibration type,
+			  u32 val)
+{
+	struct {
+		__le32 id;
+		__le32 value;
+	} __packed __aligned(4) msg = {
+		.id = cpu_to_le32(type),
+		.value = cpu_to_le32(val),
+	};
+	struct sk_buff *skb;
+
+	skb = mt76u_mcu_msg_alloc(&msg, sizeof(msg));
+	if (!skb)
+		return -ENOMEM;
+	return mt76u_mcu_send_msg(&dev->mt76, skb, CMD_CALIBRATION_OP, true);
+}
+
+int mt76x2u_mcu_init_gain(struct mt76x2_dev *dev, u8 channel, u32 gain,
+			  bool force)
+{
+	struct {
+		__le32 channel;
+		__le32 gain_val;
+	} __packed __aligned(4) msg = {
+		.channel = cpu_to_le32(channel),
+		.gain_val = cpu_to_le32(gain),
+	};
+	struct sk_buff *skb;
+
+	if (force)
+		msg.channel |= cpu_to_le32(BIT(31));
+
+	skb = mt76u_mcu_msg_alloc(&msg, sizeof(msg));
+	if (!skb)
+		return -ENOMEM;
+	return mt76u_mcu_send_msg(&dev->mt76, skb, CMD_INIT_GAIN_OP, true);
+}
+
+int mt76x2u_mcu_set_dynamic_vga(struct mt76x2_dev *dev, u8 channel, bool ap,
+				bool ext, int rssi, u32 false_cca)
+{
+	struct {
+		__le32 channel;
+		__le32 rssi_val;
+		__le32 false_cca_val;
+	} __packed __aligned(4) msg = {
+		.rssi_val = cpu_to_le32(rssi),
+		.false_cca_val = cpu_to_le32(false_cca),
+	};
+	struct sk_buff *skb;
+	u32 val = channel;
+
+	if (ap)
+		val |= BIT(31);
+	if (ext)
+		val |= BIT(30);
+	msg.channel = cpu_to_le32(val);
+
+	skb = mt76u_mcu_msg_alloc(&msg, sizeof(msg));
+	if (!skb)
+		return -ENOMEM;
+	return mt76u_mcu_send_msg(&dev->mt76, skb, CMD_DYNC_VGA_OP, true);
+}
+
+int mt76x2u_mcu_tssi_comp(struct mt76x2_dev *dev,
+			  struct mt76x2_tssi_comp *tssi_data)
+{
+	struct {
+		__le32 id;
+		struct mt76x2_tssi_comp data;
+	} __packed __aligned(4) msg = {
+		.id = cpu_to_le32(MCU_CAL_TSSI_COMP),
+		.data = *tssi_data,
+	};
+	struct sk_buff *skb;
+
+	skb = mt76u_mcu_msg_alloc(&msg, sizeof(msg));
+	if (!skb)
+		return -ENOMEM;
+	return mt76u_mcu_send_msg(&dev->mt76, skb, CMD_CALIBRATION_OP, true);
+}
+
+static void mt76x2u_mcu_load_ivb(struct mt76x2_dev *dev)
+{
+	mt76u_vendor_request(&dev->mt76, MT_VEND_DEV_MODE,
+			     USB_DIR_OUT | USB_TYPE_VENDOR,
+			     0x12, 0, NULL, 0);
+}
+
+static void mt76x2u_mcu_enable_patch(struct mt76x2_dev *dev)
+{
+	struct mt76_usb *usb = &dev->mt76.usb;
+	const u8 data[] = {
+		0x6f, 0xfc, 0x08, 0x01,
+		0x20, 0x04, 0x00, 0x00,
+		0x00, 0x09, 0x00,
+	};
+
+	memcpy(usb->data, data, sizeof(data));
+	mt76u_vendor_request(&dev->mt76, MT_VEND_DEV_MODE,
+			     USB_DIR_OUT | USB_TYPE_CLASS,
+			     0x12, 0, usb->data, sizeof(data));
+}
+
+static void mt76x2u_mcu_reset_wmt(struct mt76x2_dev *dev)
+{
+	struct mt76_usb *usb = &dev->mt76.usb;
+	u8 data[] = {
+		0x6f, 0xfc, 0x05, 0x01,
+		0x07, 0x01, 0x00, 0x04
+	};
+
+	memcpy(usb->data, data, sizeof(data));
+	mt76u_vendor_request(&dev->mt76, MT_VEND_DEV_MODE,
+			     USB_DIR_OUT | USB_TYPE_CLASS,
+			     0x12, 0, usb->data, sizeof(data));
+}
+
+static int mt76x2u_mcu_load_rom_patch(struct mt76x2_dev *dev)
+{
+	bool rom_protect = !is_mt7612(dev);
+	struct mt76x2_patch_header *hdr;
+	u32 val, patch_mask, patch_reg;
+	const struct firmware *fw;
+	int err;
+
+	if (rom_protect &&
+	    !mt76_poll_msec(dev, MT_MCU_SEMAPHORE_03, 1, 1, 600)) {
+		dev_err(dev->mt76.dev,
+			"could not get hardware semaphore for ROM PATCH\n");
+		return -ETIMEDOUT;
+	}
+
+	if (mt76xx_rev(dev) >= MT76XX_REV_E3) {
+		patch_mask = BIT(0);
+		patch_reg = MT_MCU_CLOCK_CTL;
+	} else {
+		patch_mask = BIT(1);
+		patch_reg = MT_MCU_COM_REG0;
+	}
+
+	if (rom_protect && (mt76_rr(dev, patch_reg) & patch_mask)) {
+		dev_info(dev->mt76.dev, "ROM patch already applied\n");
+		return 0;
+	}
+
+	err = request_firmware(&fw, MT7662U_ROM_PATCH, dev->mt76.dev);
+	if (err < 0)
+		return err;
+
+	if (!fw || !fw->data || fw->size <= sizeof(*hdr)) {
+		dev_err(dev->mt76.dev, "failed to load firmware\n");
+		err = -EIO;
+		goto out;
+	}
+
+	hdr = (struct mt76x2_patch_header *)fw->data;
+	dev_info(dev->mt76.dev, "ROM patch build: %.15s\n", hdr->build_time);
+
+	/* enable USB_DMA_CFG */
+	val = MT_USB_DMA_CFG_RX_BULK_EN |
+	      MT_USB_DMA_CFG_TX_BULK_EN |
+	      FIELD_PREP(MT_USB_DMA_CFG_RX_BULK_AGG_TOUT, 0x20);
+	mt76_wr(dev, MT_VEND_ADDR(CFG, MT_USB_U3DMA_CFG), val);
+
+	/* vendor reset */
+	mt76u_mcu_fw_reset(&dev->mt76);
+	usleep_range(5000, 10000);
+
+	/* enable FCE to send in-band cmd */
+	mt76_wr(dev, MT_FCE_PSE_CTRL, 0x1);
+	/* FCE tx_fs_base_ptr */
+	mt76_wr(dev, MT_TX_CPU_FROM_FCE_BASE_PTR, 0x400230);
+	/* FCE tx_fs_max_cnt */
+	mt76_wr(dev, MT_TX_CPU_FROM_FCE_MAX_COUNT, 0x1);
+	/* FCE pdma enable */
+	mt76_wr(dev, MT_FCE_PDMA_GLOBAL_CONF, 0x44);
+	/* FCE skip_fs_en */
+	mt76_wr(dev, MT_FCE_SKIP_FS, 0x3);
+
+	err = mt76u_mcu_fw_send_data(&dev->mt76, fw->data + sizeof(*hdr),
+				     fw->size - sizeof(*hdr),
+				     MCU_ROM_PATCH_MAX_PAYLOAD,
+				     MT76U_MCU_ROM_PATCH_OFFSET);
+	if (err < 0) {
+		err = -EIO;
+		goto out;
+	}
+
+	mt76x2u_mcu_enable_patch(dev);
+	mt76x2u_mcu_reset_wmt(dev);
+	mdelay(20);
+
+	if (!mt76_poll_msec(dev, patch_reg, patch_mask, patch_mask, 100)) {
+		dev_err(dev->mt76.dev, "failed to load ROM patch\n");
+		err = -ETIMEDOUT;
+	}
+
+out:
+	if (rom_protect)
+		mt76_wr(dev, MT_MCU_SEMAPHORE_03, 1);
+	release_firmware(fw);
+	return err;
+}
+
+static int mt76x2u_mcu_load_firmware(struct mt76x2_dev *dev)
+{
+	u32 val, dlm_offset = MT76U_MCU_DLM_OFFSET;
+	const struct mt76x2_fw_header *hdr;
+	int err, len, ilm_len, dlm_len;
+	const struct firmware *fw;
+
+	err = request_firmware(&fw, MT7662U_FIRMWARE, dev->mt76.dev);
+	if (err < 0)
+		return err;
+
+	if (!fw || !fw->data || fw->size < sizeof(*hdr)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	hdr = (const struct mt76x2_fw_header *)fw->data;
+	ilm_len = le32_to_cpu(hdr->ilm_len);
+	dlm_len = le32_to_cpu(hdr->dlm_len);
+	len = sizeof(*hdr) + ilm_len + dlm_len;
+	if (fw->size != len) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	val = le16_to_cpu(hdr->fw_ver);
+	dev_info(dev->mt76.dev, "Firmware Version: %d.%d.%02d\n",
+		 (val >> 12) & 0xf, (val >> 8) & 0xf, val & 0xf);
+
+	val = le16_to_cpu(hdr->build_ver);
+	dev_info(dev->mt76.dev, "Build: %x\n", val);
+	dev_info(dev->mt76.dev, "Build Time: %.16s\n", hdr->build_time);
+
+	/* vendor reset */
+	mt76u_mcu_fw_reset(&dev->mt76);
+	usleep_range(5000, 10000);
+
+	/* enable USB_DMA_CFG */
+	val = MT_USB_DMA_CFG_RX_BULK_EN |
+	      MT_USB_DMA_CFG_TX_BULK_EN |
+	      FIELD_PREP(MT_USB_DMA_CFG_RX_BULK_AGG_TOUT, 0x20);
+	mt76_wr(dev, MT_VEND_ADDR(CFG, MT_USB_U3DMA_CFG), val);
+	/* enable FCE to send in-band cmd */
+	mt76_wr(dev, MT_FCE_PSE_CTRL, 0x1);
+	/* FCE tx_fs_base_ptr */
+	mt76_wr(dev, MT_TX_CPU_FROM_FCE_BASE_PTR, 0x400230);
+	/* FCE tx_fs_max_cnt */
+	mt76_wr(dev, MT_TX_CPU_FROM_FCE_MAX_COUNT, 0x1);
+	/* FCE pdma enable */
+	mt76_wr(dev, MT_FCE_PDMA_GLOBAL_CONF, 0x44);
+	/* FCE skip_fs_en */
+	mt76_wr(dev, MT_FCE_SKIP_FS, 0x3);
+
+	/* load ILM */
+	err = mt76u_mcu_fw_send_data(&dev->mt76, fw->data + sizeof(*hdr),
+				     ilm_len, MCU_FW_URB_MAX_PAYLOAD,
+				     MT76U_MCU_ILM_OFFSET);
+	if (err < 0) {
+		err = -EIO;
+		goto out;
+	}
+
+	/* load DLM */
+	if (mt76xx_rev(dev) >= MT76XX_REV_E3)
+		dlm_offset += 0x800;
+	err = mt76u_mcu_fw_send_data(&dev->mt76,
+				     fw->data + sizeof(*hdr) + ilm_len,
+				     dlm_len, MCU_FW_URB_MAX_PAYLOAD,
+				     dlm_offset);
+	if (err < 0) {
+		err = -EIO;
+		goto out;
+	}
+
+	mt76x2u_mcu_load_ivb(dev);
+	if (!mt76_poll_msec(dev, MT_MCU_COM_REG0, 1, 1, 100)) {
+		dev_err(dev->mt76.dev, "firmware failed to start\n");
+		err = -ETIMEDOUT;
+		goto out;
+	}
+
+	mt76_set(dev, MT_MCU_COM_REG0, BIT(1));
+	/* enable FCE to send in-band cmd */
+	mt76_wr(dev, MT_FCE_PSE_CTRL, 0x1);
+	dev_dbg(dev->mt76.dev, "firmware running\n");
+
+out:
+	release_firmware(fw);
+	return err;
+}
+
+int mt76x2u_mcu_fw_init(struct mt76x2_dev *dev)
+{
+	int err;
+
+	err = mt76x2u_mcu_load_rom_patch(dev);
+	if (err < 0)
+		return err;
+
+	return mt76x2u_mcu_load_firmware(dev);
+}
+
+int mt76x2u_mcu_init(struct mt76x2_dev *dev)
+{
+	int err;
+
+	err = mt76x2u_mcu_function_select(dev, Q_SELECT, 1);
+	if (err < 0)
+		return err;
+
+	return mt76x2u_mcu_set_radio_state(dev, true);
+}
+
+void mt76x2u_mcu_deinit(struct mt76x2_dev *dev)
+{
+	struct mt76_usb *usb = &dev->mt76.usb;
+
+	usb_kill_urb(usb->mcu.res.urb);
+	mt76u_buf_free(&usb->mcu.res);
+}