mt76: usb: move mt76x02 mcu code in mt76x02-usb module

Introduce mt76x02_usb_mcu.c in order to contain mt76x02u mcu related
code. Add mt76x02-usb module as a container for mt76x02 usb code.
This is a preliminary patch to move MT_TXD_INFO, MT_MCU_MSG and
MT_RX_FCE_INFO defs in mt76x02-lib module since other chipsets (e.g.
mt7603) use different dma definitions

Acked-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 358 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c
new file mode 100644
index 000000000000..3072be3e0dde
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c
@@ -0,0 +1,358 @@
+/*
+ * 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 "mt76.h"
+#include "dma.h"
+#include "mt76x02_mcu.h"
+
+#define MT_CMD_HDR_LEN			4
+
+#define MT_FCE_DMA_ADDR			0x0230
+#define MT_FCE_DMA_LEN			0x0234
+
+#define MT_TX_CPU_FROM_FCE_CPU_DESC_IDX	0x09a8
+
+static struct sk_buff *
+mt76x02u_mcu_msg_alloc(const void *data, int len)
+{
+	struct sk_buff *skb;
+
+	skb = alloc_skb(MT_CMD_HDR_LEN + len + 8, GFP_KERNEL);
+	if (!skb)
+		return NULL;
+
+	skb_reserve(skb, MT_CMD_HDR_LEN);
+	skb_put_data(skb, data, len);
+
+	return skb;
+}
+
+static void
+mt76x02u_multiple_mcu_reads(struct mt76_dev *dev, u8 *data, int len)
+{
+	struct mt76_usb *usb = &dev->usb;
+	u32 reg, val;
+	int i;
+
+	if (usb->mcu.burst) {
+		WARN_ON_ONCE(len / 4 != usb->mcu.rp_len);
+
+		reg = usb->mcu.rp[0].reg - usb->mcu.base;
+		for (i = 0; i < usb->mcu.rp_len; i++) {
+			val = get_unaligned_le32(data + 4 * i);
+			usb->mcu.rp[i].reg = reg++;
+			usb->mcu.rp[i].value = val;
+		}
+	} else {
+		WARN_ON_ONCE(len / 8 != usb->mcu.rp_len);
+
+		for (i = 0; i < usb->mcu.rp_len; i++) {
+			reg = get_unaligned_le32(data + 8 * i) -
+			      usb->mcu.base;
+			val = get_unaligned_le32(data + 8 * i + 4);
+
+			WARN_ON_ONCE(usb->mcu.rp[i].reg != reg);
+			usb->mcu.rp[i].value = val;
+		}
+	}
+}
+
+static int mt76x02u_mcu_wait_resp(struct mt76_dev *dev, u8 seq)
+{
+	struct mt76_usb *usb = &dev->usb;
+	struct mt76u_buf *buf = &usb->mcu.res;
+	struct urb *urb = buf->urb;
+	int i, ret;
+	u32 rxfce;
+	u8 *data;
+
+	for (i = 0; i < 5; i++) {
+		if (!wait_for_completion_timeout(&usb->mcu.cmpl,
+						 msecs_to_jiffies(300)))
+			continue;
+
+		if (urb->status)
+			return -EIO;
+
+		data = sg_virt(&urb->sg[0]);
+		if (usb->mcu.rp)
+			mt76x02u_multiple_mcu_reads(dev, data + 4,
+						    urb->actual_length - 8);
+
+		rxfce = get_unaligned_le32(data);
+		ret = mt76u_submit_buf(dev, USB_DIR_IN,
+				       MT_EP_IN_CMD_RESP,
+				       buf, GFP_KERNEL,
+				       mt76u_mcu_complete_urb,
+				       &usb->mcu.cmpl);
+		if (ret)
+			return ret;
+
+		if (seq == FIELD_GET(MT_RX_FCE_INFO_CMD_SEQ, rxfce) &&
+		    FIELD_GET(MT_RX_FCE_INFO_EVT_TYPE, rxfce) == EVT_CMD_DONE)
+			return 0;
+
+		dev_err(dev->dev, "error: MCU resp evt:%lx seq:%hhx-%lx\n",
+			FIELD_GET(MT_RX_FCE_INFO_EVT_TYPE, rxfce),
+			seq, FIELD_GET(MT_RX_FCE_INFO_CMD_SEQ, rxfce));
+	}
+
+	dev_err(dev->dev, "error: %s timed out\n", __func__);
+	return -ETIMEDOUT;
+}
+
+static int
+__mt76x02u_mcu_send_msg(struct mt76_dev *dev, struct sk_buff *skb,
+			int cmd, bool wait_resp)
+{
+	struct usb_interface *intf = to_usb_interface(dev->dev);
+	struct usb_device *udev = interface_to_usbdev(intf);
+	struct mt76_usb *usb = &dev->usb;
+	unsigned int pipe;
+	int ret, sent;
+	u8 seq = 0;
+	u32 info;
+
+	if (!skb)
+		return -EINVAL;
+
+	if (test_bit(MT76_REMOVED, &dev->state))
+		return 0;
+
+	pipe = usb_sndbulkpipe(udev, usb->out_ep[MT_EP_OUT_INBAND_CMD]);
+	if (wait_resp) {
+		seq = ++usb->mcu.msg_seq & 0xf;
+		if (!seq)
+			seq = ++usb->mcu.msg_seq & 0xf;
+	}
+
+	info = FIELD_PREP(MT_MCU_MSG_CMD_SEQ, seq) |
+	       FIELD_PREP(MT_MCU_MSG_CMD_TYPE, cmd) |
+	       MT_MCU_MSG_TYPE_CMD;
+	ret = mt76u_skb_dma_info(skb, CPU_TX_PORT, info);
+	if (ret)
+		return ret;
+
+	ret = usb_bulk_msg(udev, pipe, skb->data, skb->len, &sent, 500);
+	if (ret)
+		return ret;
+
+	if (wait_resp)
+		ret = mt76x02u_mcu_wait_resp(dev, seq);
+
+	consume_skb(skb);
+
+	return ret;
+}
+
+static int
+mt76x02u_mcu_send_msg(struct mt76_dev *dev, struct sk_buff *skb,
+		      int cmd, bool wait_resp)
+{
+	struct mt76_usb *usb = &dev->usb;
+	int err;
+
+	mutex_lock(&usb->mcu.mutex);
+	err = __mt76x02u_mcu_send_msg(dev, skb, cmd, wait_resp);
+	mutex_unlock(&usb->mcu.mutex);
+
+	return err;
+}
+
+static inline void skb_put_le32(struct sk_buff *skb, u32 val)
+{
+	put_unaligned_le32(val, skb_put(skb, 4));
+}
+
+static int
+mt76x02u_mcu_wr_rp(struct mt76_dev *dev, u32 base,
+		   const struct mt76_reg_pair *data, int n)
+{
+	const int CMD_RANDOM_WRITE = 12;
+	const int max_vals_per_cmd = MT_INBAND_PACKET_MAX_LEN / 8;
+	struct sk_buff *skb;
+	int cnt, i, ret;
+
+	if (!n)
+		return 0;
+
+	cnt = min(max_vals_per_cmd, n);
+
+	skb = alloc_skb(cnt * 8 + MT_DMA_HDR_LEN + 4, GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+	skb_reserve(skb, MT_DMA_HDR_LEN);
+
+	for (i = 0; i < cnt; i++) {
+		skb_put_le32(skb, base + data[i].reg);
+		skb_put_le32(skb, data[i].value);
+	}
+
+	ret = mt76x02u_mcu_send_msg(dev, skb, CMD_RANDOM_WRITE, cnt == n);
+	if (ret)
+		return ret;
+
+	return mt76x02u_mcu_wr_rp(dev, base, data + cnt, n - cnt);
+}
+
+static int
+mt76x02u_mcu_rd_rp(struct mt76_dev *dev, u32 base,
+		   struct mt76_reg_pair *data, int n)
+{
+	const int CMD_RANDOM_READ = 10;
+	const int max_vals_per_cmd = MT_INBAND_PACKET_MAX_LEN / 8;
+	struct mt76_usb *usb = &dev->usb;
+	struct sk_buff *skb;
+	int cnt, i, ret;
+
+	if (!n)
+		return 0;
+
+	cnt = min(max_vals_per_cmd, n);
+	if (cnt != n)
+		return -EINVAL;
+
+	skb = alloc_skb(cnt * 8 + MT_DMA_HDR_LEN + 4, GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+	skb_reserve(skb, MT_DMA_HDR_LEN);
+
+	for (i = 0; i < cnt; i++) {
+		skb_put_le32(skb, base + data[i].reg);
+		skb_put_le32(skb, data[i].value);
+	}
+
+	mutex_lock(&usb->mcu.mutex);
+
+	usb->mcu.rp = data;
+	usb->mcu.rp_len = n;
+	usb->mcu.base = base;
+	usb->mcu.burst = false;
+
+	ret = __mt76x02u_mcu_send_msg(dev, skb, CMD_RANDOM_READ, true);
+
+	usb->mcu.rp = NULL;
+
+	mutex_unlock(&usb->mcu.mutex);
+
+	return ret;
+}
+
+void mt76x02u_mcu_fw_reset(struct mt76_dev *dev)
+{
+	mt76u_vendor_request(dev, MT_VEND_DEV_MODE,
+			     USB_DIR_OUT | USB_TYPE_VENDOR,
+			     0x1, 0, NULL, 0);
+}
+EXPORT_SYMBOL_GPL(mt76x02u_mcu_fw_reset);
+
+static int
+__mt76x02u_mcu_fw_send_data(struct mt76_dev *dev, struct mt76u_buf *buf,
+			    const void *fw_data, int len, u32 dst_addr)
+{
+	u8 *data = sg_virt(&buf->urb->sg[0]);
+	DECLARE_COMPLETION_ONSTACK(cmpl);
+	__le32 info;
+	u32 val;
+	int err;
+
+	info = cpu_to_le32(FIELD_PREP(MT_MCU_MSG_PORT, CPU_TX_PORT) |
+			   FIELD_PREP(MT_MCU_MSG_LEN, len) |
+			   MT_MCU_MSG_TYPE_CMD);
+
+	memcpy(data, &info, sizeof(info));
+	memcpy(data + sizeof(info), fw_data, len);
+	memset(data + sizeof(info) + len, 0, 4);
+
+	mt76u_single_wr(dev, MT_VEND_WRITE_FCE,
+			MT_FCE_DMA_ADDR, dst_addr);
+	len = roundup(len, 4);
+	mt76u_single_wr(dev, MT_VEND_WRITE_FCE,
+			MT_FCE_DMA_LEN, len << 16);
+
+	buf->len = MT_CMD_HDR_LEN + len + sizeof(info);
+	err = mt76u_submit_buf(dev, USB_DIR_OUT,
+			       MT_EP_OUT_INBAND_CMD,
+			       buf, GFP_KERNEL,
+			       mt76u_mcu_complete_urb, &cmpl);
+	if (err < 0)
+		return err;
+
+	if (!wait_for_completion_timeout(&cmpl,
+					 msecs_to_jiffies(1000))) {
+		dev_err(dev->dev, "firmware upload timed out\n");
+		usb_kill_urb(buf->urb);
+		return -ETIMEDOUT;
+	}
+
+	if (mt76u_urb_error(buf->urb)) {
+		dev_err(dev->dev, "firmware upload failed: %d\n",
+			buf->urb->status);
+		return buf->urb->status;
+	}
+
+	val = mt76u_rr(dev, MT_TX_CPU_FROM_FCE_CPU_DESC_IDX);
+	val++;
+	mt76u_wr(dev, MT_TX_CPU_FROM_FCE_CPU_DESC_IDX, val);
+
+	return 0;
+}
+
+int mt76x02u_mcu_fw_send_data(struct mt76_dev *dev, const void *data,
+			      int data_len, u32 max_payload, u32 offset)
+{
+	int err, len, pos = 0, max_len = max_payload - 8;
+	struct mt76u_buf buf;
+
+	err = mt76u_buf_alloc(dev, &buf, 1, max_payload, max_payload,
+			      GFP_KERNEL);
+	if (err < 0)
+		return err;
+
+	while (data_len > 0) {
+		len = min_t(int, data_len, max_len);
+		err = __mt76x02u_mcu_fw_send_data(dev, &buf, data + pos,
+						  len, offset + pos);
+		if (err < 0)
+			break;
+
+		data_len -= len;
+		pos += len;
+		usleep_range(5000, 10000);
+	}
+	mt76u_buf_free(&buf);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(mt76x02u_mcu_fw_send_data);
+
+void mt76x02u_init_mcu(struct mt76_dev *dev)
+{
+	static const struct mt76_mcu_ops mt76x02u_mcu_ops = {
+		.mcu_msg_alloc = mt76x02u_mcu_msg_alloc,
+		.mcu_send_msg = mt76x02u_mcu_send_msg,
+		.mcu_wr_rp = mt76x02u_mcu_wr_rp,
+		.mcu_rd_rp = mt76x02u_mcu_rd_rp,
+	};
+
+	dev->mcu_ops = &mt76x02u_mcu_ops;
+}
+EXPORT_SYMBOL_GPL(mt76x02u_init_mcu);
+
+MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
+MODULE_LICENSE("Dual BSD/GPL");