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475 lines
11 KiB
475 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Copyright(c) 2007 - 2018 Intel Corporation. */ |
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#include "e1000_mbx.h" |
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/** |
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* igb_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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* @unlock: skip locking or not |
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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 igb_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id, |
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bool unlock) |
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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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/* 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, unlock); |
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return ret_val; |
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} |
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/** |
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* igb_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 igb_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 = 0; |
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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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* igb_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 igb_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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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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* igb_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 igb_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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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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* igb_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 igb_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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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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* igb_unlock_mbx - unlock the mailbox |
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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 mailbox was unlocked or else ERR_MBX |
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**/ |
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s32 igb_unlock_mbx(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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if (mbx->ops.unlock) |
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ret_val = mbx->ops.unlock(hw, mbx_id); |
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return ret_val; |
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} |
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/** |
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* igb_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 igb_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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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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udelay(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 ? 0 : -E1000_ERR_MBX; |
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} |
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/** |
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* igb_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 igb_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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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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udelay(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 ? 0 : -E1000_ERR_MBX; |
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} |
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/** |
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* igb_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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static s32 igb_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, |
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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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if (!mbx->ops.read) |
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goto out; |
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ret_val = igb_poll_for_msg(hw, mbx_id); |
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if (!ret_val) |
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ret_val = mbx->ops.read(hw, msg, size, mbx_id, true); |
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out: |
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return ret_val; |
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} |
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/** |
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* igb_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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static s32 igb_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, |
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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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/* 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 = igb_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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static s32 igb_check_for_bit_pf(struct e1000_hw *hw, u32 mask) |
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{ |
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u32 mbvficr = rd32(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 = 0; |
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wr32(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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* igb_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 igb_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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if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) { |
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ret_val = 0; |
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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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* igb_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 igb_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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if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) { |
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ret_val = 0; |
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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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* igb_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 igb_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number) |
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{ |
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u32 vflre = rd32(E1000_VFLRE); |
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s32 ret_val = -E1000_ERR_MBX; |
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if (vflre & BIT(vf_number)) { |
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ret_val = 0; |
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wr32(E1000_VFLRE, BIT(vf_number)); |
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hw->mbx.stats.rsts++; |
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} |
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return ret_val; |
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} |
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/** |
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* igb_obtain_mbx_lock_pf - obtain mailbox lock |
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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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* return SUCCESS if we obtained the mailbox lock |
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**/ |
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static s32 igb_obtain_mbx_lock_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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u32 p2v_mailbox; |
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int count = 10; |
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do { |
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/* Take ownership of the buffer */ |
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wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU); |
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/* reserve mailbox for vf use */ |
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p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number)); |
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if (p2v_mailbox & E1000_P2VMAILBOX_PFU) { |
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ret_val = 0; |
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break; |
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} |
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udelay(1000); |
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} while (count-- > 0); |
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return ret_val; |
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} |
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/** |
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* igb_release_mbx_lock_pf - release mailbox lock |
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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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* return SUCCESS if we released the mailbox lock |
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**/ |
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static s32 igb_release_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number) |
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{ |
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u32 p2v_mailbox; |
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/* drop PF lock of mailbox, if set */ |
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p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number)); |
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if (p2v_mailbox & E1000_P2VMAILBOX_PFU) |
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wr32(E1000_P2VMAILBOX(vf_number), |
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p2v_mailbox & ~E1000_P2VMAILBOX_PFU); |
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return 0; |
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} |
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/** |
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* igb_write_mbx_pf - Places a message in 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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* @vf_number: the VF index |
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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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static s32 igb_write_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size, |
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u16 vf_number) |
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{ |
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s32 ret_val; |
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u16 i; |
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/* lock the mailbox to prevent pf/vf race condition */ |
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ret_val = igb_obtain_mbx_lock_pf(hw, vf_number); |
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if (ret_val) |
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goto out_no_write; |
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/* flush msg and acks as we are overwriting the message buffer */ |
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igb_check_for_msg_pf(hw, vf_number); |
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igb_check_for_ack_pf(hw, vf_number); |
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/* copy the caller specified message to the mailbox memory buffer */ |
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for (i = 0; i < size; i++) |
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array_wr32(E1000_VMBMEM(vf_number), i, msg[i]); |
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/* Interrupt VF to tell it a message has been sent and release buffer*/ |
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wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS); |
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/* update stats */ |
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hw->mbx.stats.msgs_tx++; |
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out_no_write: |
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return ret_val; |
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} |
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/** |
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* igb_read_mbx_pf - Read 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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* @vf_number: the VF index |
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* @unlock: unlock the mailbox when done? |
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* |
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* This function copies a message from the mailbox buffer to the caller's |
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* memory buffer. The presumption is that the caller knows that there was |
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* a message due to a VF request so no polling for message is needed. |
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**/ |
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static s32 igb_read_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size, |
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u16 vf_number, bool unlock) |
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{ |
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s32 ret_val; |
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u16 i; |
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/* lock the mailbox to prevent pf/vf race condition */ |
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ret_val = igb_obtain_mbx_lock_pf(hw, vf_number); |
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if (ret_val) |
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goto out_no_read; |
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/* copy the message to the mailbox memory buffer */ |
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for (i = 0; i < size; i++) |
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msg[i] = array_rd32(E1000_VMBMEM(vf_number), i); |
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/* Acknowledge the message and release mailbox lock (or not) */ |
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if (unlock) |
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wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_ACK); |
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else |
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wr32(E1000_P2VMAILBOX(vf_number), |
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E1000_P2VMAILBOX_ACK | E1000_P2VMAILBOX_PFU); |
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/* update stats */ |
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hw->mbx.stats.msgs_rx++; |
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out_no_read: |
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return ret_val; |
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} |
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/** |
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* igb_init_mbx_params_pf - set initial values for pf mailbox |
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* @hw: pointer to the HW structure |
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* |
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* Initializes the hw->mbx struct to correct values for pf mailbox |
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*/ |
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s32 igb_init_mbx_params_pf(struct e1000_hw *hw) |
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{ |
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struct e1000_mbx_info *mbx = &hw->mbx; |
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mbx->timeout = 0; |
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mbx->usec_delay = 0; |
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mbx->size = E1000_VFMAILBOX_SIZE; |
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mbx->ops.read = igb_read_mbx_pf; |
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mbx->ops.write = igb_write_mbx_pf; |
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mbx->ops.read_posted = igb_read_posted_mbx; |
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mbx->ops.write_posted = igb_write_posted_mbx; |
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mbx->ops.check_for_msg = igb_check_for_msg_pf; |
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mbx->ops.check_for_ack = igb_check_for_ack_pf; |
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mbx->ops.check_for_rst = igb_check_for_rst_pf; |
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mbx->ops.unlock = igb_release_mbx_lock_pf; |
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mbx->stats.msgs_tx = 0; |
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mbx->stats.msgs_rx = 0; |
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mbx->stats.reqs = 0; |
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mbx->stats.acks = 0; |
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mbx->stats.rsts = 0; |
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return 0; |
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} |
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