mirror of https://github.com/F-Stack/f-stack.git
511 lines
13 KiB
C
511 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*******************************************************************************
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Intel(R) Gigabit Ethernet Linux driver
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Copyright(c) 2007-2013 Intel Corporation.
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Contact Information:
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e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
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Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*******************************************************************************/
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#include "e1000_mbx.h"
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/**
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* e1000_null_mbx_check_for_flag - No-op function, return 0
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* @hw: pointer to the HW structure
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**/
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static s32 e1000_null_mbx_check_for_flag(struct e1000_hw E1000_UNUSEDARG *hw,
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u16 E1000_UNUSEDARG mbx_id)
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{
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DEBUGFUNC("e1000_null_mbx_check_flag");
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return E1000_SUCCESS;
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}
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/**
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* e1000_null_mbx_transact - No-op function, return 0
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* @hw: pointer to the HW structure
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**/
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static s32 e1000_null_mbx_transact(struct e1000_hw E1000_UNUSEDARG *hw,
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u32 E1000_UNUSEDARG *msg,
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u16 E1000_UNUSEDARG size,
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u16 E1000_UNUSEDARG mbx_id)
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{
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DEBUGFUNC("e1000_null_mbx_rw_msg");
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return E1000_SUCCESS;
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}
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/**
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* e1000_read_mbx - Reads a message from the mailbox
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* @hw: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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* @mbx_id: id of mailbox to read
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*
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* returns SUCCESS if it successfully read message from buffer
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**/
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s32 e1000_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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DEBUGFUNC("e1000_read_mbx");
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/* limit read to size of mailbox */
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if (size > mbx->size)
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size = mbx->size;
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if (mbx->ops.read)
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ret_val = mbx->ops.read(hw, msg, size, mbx_id);
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return ret_val;
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}
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/**
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* e1000_write_mbx - Write a message to the mailbox
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* @hw: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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* @mbx_id: id of mailbox to write
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*
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* returns SUCCESS if it successfully copied message into the buffer
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**/
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s32 e1000_write_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = E1000_SUCCESS;
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DEBUGFUNC("e1000_write_mbx");
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if (size > mbx->size)
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ret_val = -E1000_ERR_MBX;
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else if (mbx->ops.write)
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ret_val = mbx->ops.write(hw, msg, size, mbx_id);
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return ret_val;
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}
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/**
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* e1000_check_for_msg - checks to see if someone sent us mail
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* @hw: pointer to the HW structure
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* @mbx_id: id of mailbox to check
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*
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* returns SUCCESS if the Status bit was found or else ERR_MBX
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**/
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s32 e1000_check_for_msg(struct e1000_hw *hw, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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DEBUGFUNC("e1000_check_for_msg");
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if (mbx->ops.check_for_msg)
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ret_val = mbx->ops.check_for_msg(hw, mbx_id);
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return ret_val;
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}
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/**
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* e1000_check_for_ack - checks to see if someone sent us ACK
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* @hw: pointer to the HW structure
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* @mbx_id: id of mailbox to check
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*
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* returns SUCCESS if the Status bit was found or else ERR_MBX
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**/
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s32 e1000_check_for_ack(struct e1000_hw *hw, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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DEBUGFUNC("e1000_check_for_ack");
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if (mbx->ops.check_for_ack)
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ret_val = mbx->ops.check_for_ack(hw, mbx_id);
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return ret_val;
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}
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/**
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* e1000_check_for_rst - checks to see if other side has reset
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* @hw: pointer to the HW structure
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* @mbx_id: id of mailbox to check
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*
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* returns SUCCESS if the Status bit was found or else ERR_MBX
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**/
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s32 e1000_check_for_rst(struct e1000_hw *hw, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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DEBUGFUNC("e1000_check_for_rst");
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if (mbx->ops.check_for_rst)
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ret_val = mbx->ops.check_for_rst(hw, mbx_id);
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return ret_val;
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}
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/**
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* e1000_poll_for_msg - Wait for message notification
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* @hw: pointer to the HW structure
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* @mbx_id: id of mailbox to write
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*
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* returns SUCCESS if it successfully received a message notification
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**/
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static s32 e1000_poll_for_msg(struct e1000_hw *hw, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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int countdown = mbx->timeout;
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DEBUGFUNC("e1000_poll_for_msg");
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if (!countdown || !mbx->ops.check_for_msg)
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goto out;
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while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
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countdown--;
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if (!countdown)
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break;
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usec_delay(mbx->usec_delay);
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}
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/* if we failed, all future posted messages fail until reset */
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if (!countdown)
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mbx->timeout = 0;
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out:
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return countdown ? E1000_SUCCESS : -E1000_ERR_MBX;
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}
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/**
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* e1000_poll_for_ack - Wait for message acknowledgement
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* @hw: pointer to the HW structure
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* @mbx_id: id of mailbox to write
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*
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* returns SUCCESS if it successfully received a message acknowledgement
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**/
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static s32 e1000_poll_for_ack(struct e1000_hw *hw, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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int countdown = mbx->timeout;
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DEBUGFUNC("e1000_poll_for_ack");
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if (!countdown || !mbx->ops.check_for_ack)
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goto out;
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while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
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countdown--;
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if (!countdown)
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break;
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usec_delay(mbx->usec_delay);
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}
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/* if we failed, all future posted messages fail until reset */
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if (!countdown)
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mbx->timeout = 0;
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out:
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return countdown ? E1000_SUCCESS : -E1000_ERR_MBX;
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}
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/**
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* e1000_read_posted_mbx - Wait for message notification and receive message
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* @hw: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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* @mbx_id: id of mailbox to write
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*
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* returns SUCCESS if it successfully received a message notification and
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* copied it into the receive buffer.
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**/
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s32 e1000_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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DEBUGFUNC("e1000_read_posted_mbx");
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if (!mbx->ops.read)
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goto out;
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ret_val = e1000_poll_for_msg(hw, mbx_id);
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/* if ack received read message, otherwise we timed out */
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if (!ret_val)
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ret_val = mbx->ops.read(hw, msg, size, mbx_id);
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out:
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return ret_val;
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}
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/**
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* e1000_write_posted_mbx - Write a message to the mailbox, wait for ack
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* @hw: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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* @mbx_id: id of mailbox to write
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*
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* returns SUCCESS if it successfully copied message into the buffer and
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* received an ack to that message within delay * timeout period
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**/
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s32 e1000_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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DEBUGFUNC("e1000_write_posted_mbx");
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/* exit if either we can't write or there isn't a defined timeout */
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if (!mbx->ops.write || !mbx->timeout)
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goto out;
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/* send msg */
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ret_val = mbx->ops.write(hw, msg, size, mbx_id);
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/* if msg sent wait until we receive an ack */
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if (!ret_val)
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ret_val = e1000_poll_for_ack(hw, mbx_id);
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out:
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return ret_val;
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}
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/**
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* e1000_init_mbx_ops_generic - Initialize mbx function pointers
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* @hw: pointer to the HW structure
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*
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* Sets the function pointers to no-op functions
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**/
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void e1000_init_mbx_ops_generic(struct e1000_hw *hw)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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mbx->ops.init_params = e1000_null_ops_generic;
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mbx->ops.read = e1000_null_mbx_transact;
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mbx->ops.write = e1000_null_mbx_transact;
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mbx->ops.check_for_msg = e1000_null_mbx_check_for_flag;
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mbx->ops.check_for_ack = e1000_null_mbx_check_for_flag;
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mbx->ops.check_for_rst = e1000_null_mbx_check_for_flag;
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mbx->ops.read_posted = e1000_read_posted_mbx;
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mbx->ops.write_posted = e1000_write_posted_mbx;
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}
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static s32 e1000_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
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{
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u32 mbvficr = E1000_READ_REG(hw, E1000_MBVFICR);
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s32 ret_val = -E1000_ERR_MBX;
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if (mbvficr & mask) {
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ret_val = E1000_SUCCESS;
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E1000_WRITE_REG(hw, E1000_MBVFICR, mask);
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}
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return ret_val;
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}
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/**
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* e1000_check_for_msg_pf - checks to see if the VF has sent mail
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* @hw: pointer to the HW structure
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* @vf_number: the VF index
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*
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* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
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**/
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static s32 e1000_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
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{
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s32 ret_val = -E1000_ERR_MBX;
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DEBUGFUNC("e1000_check_for_msg_pf");
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if (!e1000_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
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ret_val = E1000_SUCCESS;
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hw->mbx.stats.reqs++;
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}
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return ret_val;
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}
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/**
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* e1000_check_for_ack_pf - checks to see if the VF has ACKed
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* @hw: pointer to the HW structure
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* @vf_number: the VF index
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*
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* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
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**/
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static s32 e1000_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
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{
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s32 ret_val = -E1000_ERR_MBX;
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DEBUGFUNC("e1000_check_for_ack_pf");
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if (!e1000_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
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ret_val = E1000_SUCCESS;
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hw->mbx.stats.acks++;
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}
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return ret_val;
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}
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/**
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* e1000_check_for_rst_pf - checks to see if the VF has reset
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* @hw: pointer to the HW structure
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* @vf_number: the VF index
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*
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* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
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**/
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static s32 e1000_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
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{
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u32 vflre = E1000_READ_REG(hw, E1000_VFLRE);
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s32 ret_val = -E1000_ERR_MBX;
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DEBUGFUNC("e1000_check_for_rst_pf");
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if (vflre & (1 << vf_number)) {
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ret_val = E1000_SUCCESS;
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E1000_WRITE_REG(hw, E1000_VFLRE, (1 << vf_number));
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|
hw->mbx.stats.rsts++;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret_val;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* e1000_obtain_mbx_lock_pf - obtain mailbox lock
|
||
|
|
* @hw: pointer to the HW structure
|
||
|
|
* @vf_number: the VF index
|
||
|
|
*
|
||
|
|
* return SUCCESS if we obtained the mailbox lock
|
||
|
|
**/
|
||
|
|
static s32 e1000_obtain_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
|
||
|
|
{
|
||
|
|
s32 ret_val = -E1000_ERR_MBX;
|
||
|
|
u32 p2v_mailbox;
|
||
|
|
|
||
|
|
DEBUGFUNC("e1000_obtain_mbx_lock_pf");
|
||
|
|
|
||
|
|
/* Take ownership of the buffer */
|
||
|
|
E1000_WRITE_REG(hw, E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
|
||
|
|
|
||
|
|
/* reserve mailbox for vf use */
|
||
|
|
p2v_mailbox = E1000_READ_REG(hw, E1000_P2VMAILBOX(vf_number));
|
||
|
|
if (p2v_mailbox & E1000_P2VMAILBOX_PFU)
|
||
|
|
ret_val = E1000_SUCCESS;
|
||
|
|
|
||
|
|
return ret_val;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* e1000_write_mbx_pf - Places a message in the mailbox
|
||
|
|
* @hw: pointer to the HW structure
|
||
|
|
* @msg: The message buffer
|
||
|
|
* @size: Length of buffer
|
||
|
|
* @vf_number: the VF index
|
||
|
|
*
|
||
|
|
* returns SUCCESS if it successfully copied message into the buffer
|
||
|
|
**/
|
||
|
|
static s32 e1000_write_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
|
||
|
|
u16 vf_number)
|
||
|
|
{
|
||
|
|
s32 ret_val;
|
||
|
|
u16 i;
|
||
|
|
|
||
|
|
DEBUGFUNC("e1000_write_mbx_pf");
|
||
|
|
|
||
|
|
/* lock the mailbox to prevent pf/vf race condition */
|
||
|
|
ret_val = e1000_obtain_mbx_lock_pf(hw, vf_number);
|
||
|
|
if (ret_val)
|
||
|
|
goto out_no_write;
|
||
|
|
|
||
|
|
/* flush msg and acks as we are overwriting the message buffer */
|
||
|
|
e1000_check_for_msg_pf(hw, vf_number);
|
||
|
|
e1000_check_for_ack_pf(hw, vf_number);
|
||
|
|
|
||
|
|
/* copy the caller specified message to the mailbox memory buffer */
|
||
|
|
for (i = 0; i < size; i++)
|
||
|
|
E1000_WRITE_REG_ARRAY(hw, E1000_VMBMEM(vf_number), i, msg[i]);
|
||
|
|
|
||
|
|
/* Interrupt VF to tell it a message has been sent and release buffer*/
|
||
|
|
E1000_WRITE_REG(hw, E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS);
|
||
|
|
|
||
|
|
/* update stats */
|
||
|
|
hw->mbx.stats.msgs_tx++;
|
||
|
|
|
||
|
|
out_no_write:
|
||
|
|
return ret_val;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* e1000_read_mbx_pf - Read a message from the mailbox
|
||
|
|
* @hw: pointer to the HW structure
|
||
|
|
* @msg: The message buffer
|
||
|
|
* @size: Length of buffer
|
||
|
|
* @vf_number: the VF index
|
||
|
|
*
|
||
|
|
* This function copies a message from the mailbox buffer to the caller's
|
||
|
|
* memory buffer. The presumption is that the caller knows that there was
|
||
|
|
* a message due to a VF request so no polling for message is needed.
|
||
|
|
**/
|
||
|
|
static s32 e1000_read_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
|
||
|
|
u16 vf_number)
|
||
|
|
{
|
||
|
|
s32 ret_val;
|
||
|
|
u16 i;
|
||
|
|
|
||
|
|
DEBUGFUNC("e1000_read_mbx_pf");
|
||
|
|
|
||
|
|
/* lock the mailbox to prevent pf/vf race condition */
|
||
|
|
ret_val = e1000_obtain_mbx_lock_pf(hw, vf_number);
|
||
|
|
if (ret_val)
|
||
|
|
goto out_no_read;
|
||
|
|
|
||
|
|
/* copy the message to the mailbox memory buffer */
|
||
|
|
for (i = 0; i < size; i++)
|
||
|
|
msg[i] = E1000_READ_REG_ARRAY(hw, E1000_VMBMEM(vf_number), i);
|
||
|
|
|
||
|
|
/* Acknowledge the message and release buffer */
|
||
|
|
E1000_WRITE_REG(hw, E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_ACK);
|
||
|
|
|
||
|
|
/* update stats */
|
||
|
|
hw->mbx.stats.msgs_rx++;
|
||
|
|
|
||
|
|
out_no_read:
|
||
|
|
return ret_val;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* e1000_init_mbx_params_pf - set initial values for pf mailbox
|
||
|
|
* @hw: pointer to the HW structure
|
||
|
|
*
|
||
|
|
* Initializes the hw->mbx struct to correct values for pf mailbox
|
||
|
|
*/
|
||
|
|
s32 e1000_init_mbx_params_pf(struct e1000_hw *hw)
|
||
|
|
{
|
||
|
|
struct e1000_mbx_info *mbx = &hw->mbx;
|
||
|
|
|
||
|
|
switch (hw->mac.type) {
|
||
|
|
case e1000_82576:
|
||
|
|
case e1000_i350:
|
||
|
|
case e1000_i354:
|
||
|
|
mbx->timeout = 0;
|
||
|
|
mbx->usec_delay = 0;
|
||
|
|
|
||
|
|
mbx->size = E1000_VFMAILBOX_SIZE;
|
||
|
|
|
||
|
|
mbx->ops.read = e1000_read_mbx_pf;
|
||
|
|
mbx->ops.write = e1000_write_mbx_pf;
|
||
|
|
mbx->ops.read_posted = e1000_read_posted_mbx;
|
||
|
|
mbx->ops.write_posted = e1000_write_posted_mbx;
|
||
|
|
mbx->ops.check_for_msg = e1000_check_for_msg_pf;
|
||
|
|
mbx->ops.check_for_ack = e1000_check_for_ack_pf;
|
||
|
|
mbx->ops.check_for_rst = e1000_check_for_rst_pf;
|
||
|
|
|
||
|
|
mbx->stats.msgs_tx = 0;
|
||
|
|
mbx->stats.msgs_rx = 0;
|
||
|
|
mbx->stats.reqs = 0;
|
||
|
|
mbx->stats.acks = 0;
|
||
|
|
mbx->stats.rsts = 0;
|
||
|
|
default:
|
||
|
|
return E1000_SUCCESS;
|
||
|
|
}
|
||
|
|
}
|