1 files changed, 419 insertions, 0 deletions
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_mbx.c b/drivers/net/ethernet/wangxun/libwx/wx_mbx.c
new file mode 100644
index 000000000000..2aa03eadf064
--- /dev/null
+++ b/drivers/net/ethernet/wangxun/libwx/wx_mbx.c
@@ -0,0 +1,419 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2015 - 2025 Beijing WangXun Technology Co., Ltd. */
+
+#include <linux/pci.h>
+#include "wx_type.h"
+#include "wx_mbx.h"
+
+/**
+ *  wx_obtain_mbx_lock_pf - obtain mailbox lock
+ *  @wx: pointer to the HW structure
+ *  @vf: the VF index
+ *
+ *  Return: return 0 on success and -EBUSY on failure
+ **/
+static int wx_obtain_mbx_lock_pf(struct wx *wx, u16 vf)
+{
+	int count = 5;
+	u32 mailbox;
+
+	while (count--) {
+		/* Take ownership of the buffer */
+		wr32(wx, WX_PXMAILBOX(vf), WX_PXMAILBOX_PFU);
+
+		/* reserve mailbox for vf use */
+		mailbox = rd32(wx, WX_PXMAILBOX(vf));
+		if (mailbox & WX_PXMAILBOX_PFU)
+			return 0;
+		else if (count)
+			udelay(10);
+	}
+	wx_err(wx, "Failed to obtain mailbox lock for PF%d", vf);
+
+	return -EBUSY;
+}
+
+static int wx_check_for_bit_pf(struct wx *wx, u32 mask, int index)
+{
+	u32 mbvficr = rd32(wx, WX_MBVFICR(index));
+
+	if (!(mbvficr & mask))
+		return -EBUSY;
+	wr32(wx, WX_MBVFICR(index), mask);
+
+	return 0;
+}
+
+/**
+ *  wx_check_for_ack_pf - checks to see if the VF has acked
+ *  @wx: pointer to the HW structure
+ *  @vf: the VF index
+ *
+ *  Return: return 0 if the VF has set the status bit or else -EBUSY
+ **/
+int wx_check_for_ack_pf(struct wx *wx, u16 vf)
+{
+	u32 index = vf / 16, vf_bit = vf % 16;
+
+	return wx_check_for_bit_pf(wx,
+				   FIELD_PREP(WX_MBVFICR_VFACK_MASK,
+					      BIT(vf_bit)),
+				   index);
+}
+
+/**
+ *  wx_check_for_msg_pf - checks to see if the VF has sent mail
+ *  @wx: pointer to the HW structure
+ *  @vf: the VF index
+ *
+ *  Return: return 0 if the VF has got req bit or else -EBUSY
+ **/
+int wx_check_for_msg_pf(struct wx *wx, u16 vf)
+{
+	u32 index = vf / 16, vf_bit = vf % 16;
+
+	return wx_check_for_bit_pf(wx,
+				   FIELD_PREP(WX_MBVFICR_VFREQ_MASK,
+					      BIT(vf_bit)),
+				   index);
+}
+
+/**
+ *  wx_write_mbx_pf - Places a message in the mailbox
+ *  @wx: pointer to the HW structure
+ *  @msg: The message buffer
+ *  @size: Length of buffer
+ *  @vf: the VF index
+ *
+ *  Return: return 0 on success and -EINVAL/-EBUSY on failure
+ **/
+int wx_write_mbx_pf(struct wx *wx, u32 *msg, u16 size, u16 vf)
+{
+	struct wx_mbx_info *mbx = &wx->mbx;
+	int ret, i;
+
+	/* mbx->size is up to 15 */
+	if (size > mbx->size) {
+		wx_err(wx, "Invalid mailbox message size %d", size);
+		return -EINVAL;
+	}
+
+	/* lock the mailbox to prevent pf/vf race condition */
+	ret = wx_obtain_mbx_lock_pf(wx, vf);
+	if (ret)
+		return ret;
+
+	/* flush msg and acks as we are overwriting the message buffer */
+	wx_check_for_msg_pf(wx, vf);
+	wx_check_for_ack_pf(wx, vf);
+
+	/* copy the caller specified message to the mailbox memory buffer */
+	for (i = 0; i < size; i++)
+		wr32a(wx, WX_PXMBMEM(vf), i, msg[i]);
+
+	/* Interrupt VF to tell it a message has been sent and release buffer */
+	/* set mirrored mailbox flags */
+	wr32a(wx, WX_PXMBMEM(vf), WX_VXMAILBOX_SIZE, WX_PXMAILBOX_STS);
+	wr32(wx, WX_PXMAILBOX(vf), WX_PXMAILBOX_STS);
+
+	return 0;
+}
+
+/**
+ *  wx_read_mbx_pf - Read a message from the mailbox
+ *  @wx: pointer to the HW structure
+ *  @msg: The message buffer
+ *  @size: Length of buffer
+ *  @vf: the VF index
+ *
+ *  Return: return 0 on success and -EBUSY on failure
+ **/
+int wx_read_mbx_pf(struct wx *wx, u32 *msg, u16 size, u16 vf)
+{
+	struct wx_mbx_info *mbx = &wx->mbx;
+	int ret;
+	u16 i;
+
+	/* limit read to size of mailbox and mbx->size is up to 15 */
+	if (size > mbx->size)
+		size = mbx->size;
+
+	/* lock the mailbox to prevent pf/vf race condition */
+	ret = wx_obtain_mbx_lock_pf(wx, vf);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < size; i++)
+		msg[i] = rd32a(wx, WX_PXMBMEM(vf), i);
+
+	/* Acknowledge the message and release buffer */
+	/* set mirrored mailbox flags */
+	wr32a(wx, WX_PXMBMEM(vf), WX_VXMAILBOX_SIZE, WX_PXMAILBOX_ACK);
+	wr32(wx, WX_PXMAILBOX(vf), WX_PXMAILBOX_ACK);
+
+	return 0;
+}
+
+/**
+ *  wx_check_for_rst_pf - checks to see if the VF has reset
+ *  @wx: pointer to the HW structure
+ *  @vf: the VF index
+ *
+ *  Return: return 0 on success and -EBUSY on failure
+ **/
+int wx_check_for_rst_pf(struct wx *wx, u16 vf)
+{
+	u32 reg_offset = WX_VF_REG_OFFSET(vf);
+	u32 vf_shift = WX_VF_IND_SHIFT(vf);
+	u32 vflre = 0;
+
+	vflre = rd32(wx, WX_VFLRE(reg_offset));
+	if (!(vflre & BIT(vf_shift)))
+		return -EBUSY;
+	wr32(wx, WX_VFLREC(reg_offset), BIT(vf_shift));
+
+	return 0;
+}
+
+static u32 wx_read_v2p_mailbox(struct wx *wx)
+{
+	u32 mailbox = rd32(wx, WX_VXMAILBOX);
+
+	mailbox |= wx->mbx.mailbox;
+	wx->mbx.mailbox |= mailbox & WX_VXMAILBOX_R2C_BITS;
+
+	return mailbox;
+}
+
+static u32 wx_mailbox_get_lock_vf(struct wx *wx)
+{
+	wr32(wx, WX_VXMAILBOX, WX_VXMAILBOX_VFU);
+	return wx_read_v2p_mailbox(wx);
+}
+
+/**
+ *  wx_obtain_mbx_lock_vf - obtain mailbox lock
+ *  @wx: pointer to the HW structure
+ *
+ *  Return: return 0 on success and -EBUSY on failure
+ **/
+static int wx_obtain_mbx_lock_vf(struct wx *wx)
+{
+	int count = 5, ret;
+	u32 mailbox;
+
+	ret = readx_poll_timeout_atomic(wx_mailbox_get_lock_vf, wx, mailbox,
+					(mailbox & WX_VXMAILBOX_VFU),
+					1, count);
+	if (ret)
+		wx_err(wx, "Failed to obtain mailbox lock for VF.\n");
+
+	return ret;
+}
+
+static int wx_check_for_bit_vf(struct wx *wx, u32 mask)
+{
+	u32 mailbox = wx_read_v2p_mailbox(wx);
+
+	wx->mbx.mailbox &= ~mask;
+
+	return (mailbox & mask ? 0 : -EBUSY);
+}
+
+/**
+ *  wx_check_for_ack_vf - checks to see if the PF has ACK'd
+ *  @wx: pointer to the HW structure
+ *
+ *  Return: return 0 if the PF has set the status bit or else -EBUSY
+ **/
+static int wx_check_for_ack_vf(struct wx *wx)
+{
+	/* read clear the pf ack bit */
+	return wx_check_for_bit_vf(wx, WX_VXMAILBOX_PFACK);
+}
+
+/**
+ *  wx_check_for_msg_vf - checks to see if the PF has sent mail
+ *  @wx: pointer to the HW structure
+ *
+ *  Return: return 0 if the PF has got req bit or else -EBUSY
+ **/
+int wx_check_for_msg_vf(struct wx *wx)
+{
+	/* read clear the pf sts bit */
+	return wx_check_for_bit_vf(wx, WX_VXMAILBOX_PFSTS);
+}
+
+/**
+ *  wx_check_for_rst_vf - checks to see if the PF has reset
+ *  @wx: pointer to the HW structure
+ *
+ *  Return: return 0 if the PF has set the reset done and -EBUSY on failure
+ **/
+int wx_check_for_rst_vf(struct wx *wx)
+{
+	/* read clear the pf reset done bit */
+	return wx_check_for_bit_vf(wx,
+				   WX_VXMAILBOX_RSTD |
+				   WX_VXMAILBOX_RSTI);
+}
+
+/**
+ *  wx_poll_for_msg - Wait for message notification
+ *  @wx: pointer to the HW structure
+ *
+ *  Return: return 0 if the VF has successfully received a message notification
+ **/
+static int wx_poll_for_msg(struct wx *wx)
+{
+	struct wx_mbx_info *mbx = &wx->mbx;
+	u32 val;
+
+	return readx_poll_timeout_atomic(wx_check_for_msg_vf, wx, val,
+					 (val == 0), mbx->udelay, mbx->timeout);
+}
+
+/**
+ *  wx_poll_for_ack - Wait for message acknowledgment
+ *  @wx: pointer to the HW structure
+ *
+ *  Return: return 0 if the VF has successfully received a message ack
+ **/
+static int wx_poll_for_ack(struct wx *wx)
+{
+	struct wx_mbx_info *mbx = &wx->mbx;
+	u32 val;
+
+	return readx_poll_timeout_atomic(wx_check_for_ack_vf, wx, val,
+					 (val == 0), mbx->udelay, mbx->timeout);
+}
+
+/**
+ *  wx_read_posted_mbx - Wait for message notification and receive message
+ *  @wx: pointer to the HW structure
+ *  @msg: The message buffer
+ *  @size: Length of buffer
+ *
+ *  Return: returns 0 if it successfully received a message notification and
+ *  copied it into the receive buffer.
+ **/
+int wx_read_posted_mbx(struct wx *wx, u32 *msg, u16 size)
+{
+	int ret;
+
+	ret = wx_poll_for_msg(wx);
+	/* if ack received read message, otherwise we timed out */
+	if (ret)
+		return ret;
+
+	return wx_read_mbx_vf(wx, msg, size);
+}
+
+/**
+ *  wx_write_posted_mbx - Write a message to the mailbox, wait for ack
+ *  @wx: pointer to the HW structure
+ *  @msg: The message buffer
+ *  @size: Length of buffer
+ *
+ *  Return: returns 0 if it successfully copied message into the buffer and
+ *  received an ack to that message within delay * timeout period
+ **/
+int wx_write_posted_mbx(struct wx *wx, u32 *msg, u16 size)
+{
+	int ret;
+
+	/* send msg */
+	ret = wx_write_mbx_vf(wx, msg, size);
+	/* if msg sent wait until we receive an ack */
+	if (ret)
+		return ret;
+
+	return wx_poll_for_ack(wx);
+}
+
+/**
+ *  wx_write_mbx_vf - Write a message to the mailbox
+ *  @wx: pointer to the HW structure
+ *  @msg: The message buffer
+ *  @size: Length of buffer
+ *
+ *  Return: returns 0 if it successfully copied message into the buffer
+ **/
+int wx_write_mbx_vf(struct wx *wx, u32 *msg, u16 size)
+{
+	struct wx_mbx_info *mbx = &wx->mbx;
+	int ret, i;
+
+	/* mbx->size is up to 15 */
+	if (size > mbx->size) {
+		wx_err(wx, "Invalid mailbox message size %d", size);
+		return -EINVAL;
+	}
+
+	/* lock the mailbox to prevent pf/vf race condition */
+	ret = wx_obtain_mbx_lock_vf(wx);
+	if (ret)
+		return ret;
+
+	/* flush msg and acks as we are overwriting the message buffer */
+	wx_check_for_msg_vf(wx);
+	wx_check_for_ack_vf(wx);
+
+	/* copy the caller specified message to the mailbox memory buffer */
+	for (i = 0; i < size; i++)
+		wr32a(wx, WX_VXMBMEM, i, msg[i]);
+
+	/* Drop VFU and interrupt the PF to tell it a message has been sent */
+	wr32(wx, WX_VXMAILBOX, WX_VXMAILBOX_REQ);
+
+	return 0;
+}
+
+/**
+ *  wx_read_mbx_vf - Reads a message from the inbox intended for vf
+ *  @wx: pointer to the HW structure
+ *  @msg: The message buffer
+ *  @size: Length of buffer
+ *
+ *  Return: returns 0 if it successfully copied message into the buffer
+ **/
+int wx_read_mbx_vf(struct wx *wx, u32 *msg, u16 size)
+{
+	struct wx_mbx_info *mbx = &wx->mbx;
+	int ret, i;
+
+	/* limit read to size of mailbox and mbx->size is up to 15 */
+	if (size > mbx->size)
+		size = mbx->size;
+
+	/* lock the mailbox to prevent pf/vf race condition */
+	ret = wx_obtain_mbx_lock_vf(wx);
+	if (ret)
+		return ret;
+
+	/* copy the message from the mailbox memory buffer */
+	for (i = 0; i < size; i++)
+		msg[i] = rd32a(wx, WX_VXMBMEM, i);
+
+	/* Acknowledge receipt and release mailbox, then we're done */
+	wr32(wx, WX_VXMAILBOX, WX_VXMAILBOX_ACK);
+
+	return 0;
+}
+
+int wx_init_mbx_params_vf(struct wx *wx)
+{
+	wx->vfinfo = kzalloc(sizeof(struct vf_data_storage),
+			     GFP_KERNEL);
+	if (!wx->vfinfo)
+		return -ENOMEM;
+
+	/* Initialize mailbox parameters */
+	wx->mbx.size = WX_VXMAILBOX_SIZE;
+	wx->mbx.mailbox = WX_VXMAILBOX;
+	wx->mbx.udelay = 10;
+	wx->mbx.timeout = 1000;
+
+	return 0;
+}
+EXPORT_SYMBOL(wx_init_mbx_params_vf);