/**
* e1000_read_mbx_vf - Reads a message from the inbox intended for vf
* @hw: pointer to the HW structure
* @msg: The message buffer
* @size: Length of buffer
* @mbx_id: id of mailbox to read
*
* returns SUCCESS if it successfuly read message from buffer
**/
static s32 e1000_read_mbx_vf(struct e1000_hw *hw, u32 *msg, u16 size,
u16 E1000_UNUSEDARG mbx_id)
{
s32 ret_val = E1000_SUCCESS;
u16 i;
DEBUGFUNC("e1000_read_mbx_vf");
/* lock the mailbox to prevent pf/vf race condition */
ret_val = e1000_obtain_mbx_lock_vf(hw);
if (ret_val)
goto out_no_read;
/* copy the message from the mailbox memory buffer */
for (i = 0; i < size; i++)
msg[i] = E1000_READ_REG_ARRAY(hw, E1000_VMBMEM(0), i);
/* Acknowledge receipt and release mailbox, then we're done */
E1000_WRITE_REG(hw, E1000_V2PMAILBOX(0), E1000_V2PMAILBOX_ACK);
/* update stats */
hw->mbx.stats.msgs_rx++;
out_no_read:
return ret_val;
}
/**
* e1000_write_mbx_vf - Write a message to the mailbox
* @hw: pointer to the HW structure
* @msg: The message buffer
* @size: Length of buffer
* @mbx_id: id of mailbox to write
*
* returns SUCCESS if it successfully copied message into the buffer
**/
static s32 e1000_write_mbx_vf(struct e1000_hw *hw, u32 *msg, u16 size,
u16 E1000_UNUSEDARG mbx_id)
{
s32 ret_val;
u16 i;
DEBUGFUNC("e1000_write_mbx_vf");
/* lock the mailbox to prevent pf/vf race condition */
ret_val = e1000_obtain_mbx_lock_vf(hw);
if (ret_val)
goto out_no_write;
/* flush msg and acks as we are overwriting the message buffer */
e1000_check_for_msg_vf(hw, 0);
e1000_check_for_ack_vf(hw, 0);
/* copy the caller specified message to the mailbox memory buffer */
for (i = 0; i < size; i++)
E1000_WRITE_REG_ARRAY(hw, E1000_VMBMEM(0), i, msg[i]);
/* update stats */
hw->mbx.stats.msgs_tx++;
/* Drop VFU and interrupt the PF to tell it a message has been sent */
E1000_WRITE_REG(hw, E1000_V2PMAILBOX(0), E1000_V2PMAILBOX_REQ);
out_no_write:
return ret_val;
}
/**
* e1000_read_v2p_mailbox - read v2p mailbox
* @hw: pointer to the HW structure
*
* This function is used to read the v2p mailbox without losing the read to
* clear status bits.
**/
static u32 e1000_read_v2p_mailbox(struct e1000_hw *hw)
{
u32 v2p_mailbox = E1000_READ_REG(hw, E1000_V2PMAILBOX(0));
v2p_mailbox |= hw->dev_spec.vf.v2p_mailbox;
hw->dev_spec.vf.v2p_mailbox |= v2p_mailbox & E1000_V2PMAILBOX_R2C_BITS;
return v2p_mailbox;
}
/**
* e1000_obtain_mbx_lock_vf - obtain mailbox lock
* @hw: pointer to the HW structure
*
* return SUCCESS if we obtained the mailbox lock
**/
static s32 e1000_obtain_mbx_lock_vf(struct e1000_hw *hw)
{
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_obtain_mbx_lock_vf");
/* Take ownership of the buffer */
E1000_WRITE_REG(hw, E1000_V2PMAILBOX(0), E1000_V2PMAILBOX_VFU);
/* reserve mailbox for vf use */
if (e1000_read_v2p_mailbox(hw) & E1000_V2PMAILBOX_VFU)
ret_val = E1000_SUCCESS;
return ret_val;
}
/**
* e1000_obtain_mbx_lock_vf - obtain mailbox lock
* @hw: pointer to the HW structure
*
* return SUCCESS if we obtained the mailbox lock
**/
static s32 e1000_obtain_mbx_lock_vf(struct e1000_hw *hw)
{
s32 ret_val = -E1000_ERR_MBX;
int count = 10;
DEBUGFUNC("e1000_obtain_mbx_lock_vf");
do {
/* Take ownership of the buffer */
E1000_WRITE_REG(hw, E1000_V2PMAILBOX(0), E1000_V2PMAILBOX_VFU);
/* reserve mailbox for vf use */
if (e1000_read_v2p_mailbox(hw) & E1000_V2PMAILBOX_VFU) {
ret_val = E1000_SUCCESS;
break;
}
usec_delay(1000);
} while (count-- > 0);
return ret_val;
}
