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/*$FreeBSD: release/9.1.0/sys/dev/e1000/e1000_mbx.c 218530 2011-02-11 01:00:26Z jfv $*/
#include "e1000_mbx.h"
/**
* e1000_null_mbx_check_for_flag - No-op function, return 0
* @hw: pointer to the HW structure
**/
static s32 e1000_null_mbx_check_for_flag(struct e1000_hw *hw, u16 mbx_id)
{
DEBUGFUNC("e1000_null_mbx_check_flag");
return E1000_SUCCESS;
}
/**
* e1000_null_mbx_transact - No-op function, return 0
* @hw: pointer to the HW structure
**/
static s32 e1000_null_mbx_transact(struct e1000_hw *hw, u32 *msg, u16 size,
u16 mbx_id)
{
DEBUGFUNC("e1000_null_mbx_rw_msg");
return E1000_SUCCESS;
}
/**
* e1000_read_mbx - Reads a message from the mailbox
* @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
**/
s32 e1000_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
{
struct e1000_mbx_info *mbx = &hw->mbx;
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_read_mbx");
/* limit read to size of mailbox */
if (size > mbx->size)
size = mbx->size;
if (mbx->ops.read)
ret_val = mbx->ops.read(hw, msg, size, mbx_id);
return ret_val;
}
/**
* e1000_write_mbx - 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
**/
s32 e1000_write_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
{
struct e1000_mbx_info *mbx = &hw->mbx;
s32 ret_val = E1000_SUCCESS;
DEBUGFUNC("e1000_write_mbx");
if (size > mbx->size)
ret_val = -E1000_ERR_MBX;
else if (mbx->ops.write)
ret_val = mbx->ops.write(hw, msg, size, mbx_id);
return ret_val;
}
/**
* e1000_check_for_msg - checks to see if someone sent us mail
* @hw: pointer to the HW structure
* @mbx_id: id of mailbox to check
*
* returns SUCCESS if the Status bit was found or else ERR_MBX
**/
s32 e1000_check_for_msg(struct e1000_hw *hw, u16 mbx_id)
{
struct e1000_mbx_info *mbx = &hw->mbx;
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_check_for_msg");
if (mbx->ops.check_for_msg)
ret_val = mbx->ops.check_for_msg(hw, mbx_id);
return ret_val;
}
/**
* e1000_check_for_ack - checks to see if someone sent us ACK
* @hw: pointer to the HW structure
* @mbx_id: id of mailbox to check
*
* returns SUCCESS if the Status bit was found or else ERR_MBX
**/
s32 e1000_check_for_ack(struct e1000_hw *hw, u16 mbx_id)
{
struct e1000_mbx_info *mbx = &hw->mbx;
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_check_for_ack");
if (mbx->ops.check_for_ack)
ret_val = mbx->ops.check_for_ack(hw, mbx_id);
return ret_val;
}
/**
* e1000_check_for_rst - checks to see if other side has reset
* @hw: pointer to the HW structure
* @mbx_id: id of mailbox to check
*
* returns SUCCESS if the Status bit was found or else ERR_MBX
**/
s32 e1000_check_for_rst(struct e1000_hw *hw, u16 mbx_id)
{
struct e1000_mbx_info *mbx = &hw->mbx;
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_check_for_rst");
if (mbx->ops.check_for_rst)
ret_val = mbx->ops.check_for_rst(hw, mbx_id);
return ret_val;
}
/**
* e1000_poll_for_msg - Wait for message notification
* @hw: pointer to the HW structure
* @mbx_id: id of mailbox to write
*
* returns SUCCESS if it successfully received a message notification
**/
static s32 e1000_poll_for_msg(struct e1000_hw *hw, u16 mbx_id)
{
struct e1000_mbx_info *mbx = &hw->mbx;
int countdown = mbx->timeout;
DEBUGFUNC("e1000_poll_for_msg");
if (!countdown || !mbx->ops.check_for_msg)
goto out;
while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
countdown--;
if (!countdown)
break;
usec_delay(mbx->usec_delay);
}
/* if we failed, all future posted messages fail until reset */
if (!countdown)
mbx->timeout = 0;
out:
return countdown ? E1000_SUCCESS : -E1000_ERR_MBX;
}
/**
* e1000_poll_for_ack - Wait for message acknowledgement
* @hw: pointer to the HW structure
* @mbx_id: id of mailbox to write
*
* returns SUCCESS if it successfully received a message acknowledgement
**/
static s32 e1000_poll_for_ack(struct e1000_hw *hw, u16 mbx_id)
{
struct e1000_mbx_info *mbx = &hw->mbx;
int countdown = mbx->timeout;
DEBUGFUNC("e1000_poll_for_ack");
if (!countdown || !mbx->ops.check_for_ack)
goto out;
while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
countdown--;
if (!countdown)
break;
usec_delay(mbx->usec_delay);
}
/* if we failed, all future posted messages fail until reset */
if (!countdown)
mbx->timeout = 0;
out:
return countdown ? E1000_SUCCESS : -E1000_ERR_MBX;
}
/**
* e1000_read_posted_mbx - Wait for message notification and receive message
* @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 received a message notification and
* copied it into the receive buffer.
**/
s32 e1000_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
{
struct e1000_mbx_info *mbx = &hw->mbx;
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_read_posted_mbx");
if (!mbx->ops.read)
goto out;
ret_val = e1000_poll_for_msg(hw, mbx_id);
/* if ack received read message, otherwise we timed out */
if (!ret_val)
ret_val = mbx->ops.read(hw, msg, size, mbx_id);
out:
return ret_val;
}
/**
* e1000_write_posted_mbx - Write a message to the mailbox, wait for ack
* @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 and
* received an ack to that message within delay * timeout period
**/
s32 e1000_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
{
struct e1000_mbx_info *mbx = &hw->mbx;
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_write_posted_mbx");
/* exit if either we can't write or there isn't a defined timeout */
if (!mbx->ops.write || !mbx->timeout)
goto out;
/* send msg */
ret_val = mbx->ops.write(hw, msg, size, mbx_id);
/* if msg sent wait until we receive an ack */
if (!ret_val)
ret_val = e1000_poll_for_ack(hw, mbx_id);
out:
return ret_val;
}
/**
* e1000_init_mbx_ops_generic - Initialize mbx function pointers
* @hw: pointer to the HW structure
*
* Sets the function pointers to no-op functions
**/
void e1000_init_mbx_ops_generic(struct e1000_hw *hw)
{
struct e1000_mbx_info *mbx = &hw->mbx;
mbx->ops.init_params = e1000_null_ops_generic;
mbx->ops.read = e1000_null_mbx_transact;
mbx->ops.write = e1000_null_mbx_transact;
mbx->ops.check_for_msg = e1000_null_mbx_check_for_flag;
mbx->ops.check_for_ack = e1000_null_mbx_check_for_flag;
mbx->ops.check_for_rst = e1000_null_mbx_check_for_flag;
mbx->ops.read_posted = e1000_read_posted_mbx;
mbx->ops.write_posted = e1000_write_posted_mbx;
}
/**
* 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_check_for_bit_vf - Determine if a status bit was set
* @hw: pointer to the HW structure
* @mask: bitmask for bits to be tested and cleared
*
* This function is used to check for the read to clear bits within
* the V2P mailbox.
**/
static s32 e1000_check_for_bit_vf(struct e1000_hw *hw, u32 mask)
{
u32 v2p_mailbox = e1000_read_v2p_mailbox(hw);
s32 ret_val = -E1000_ERR_MBX;
if (v2p_mailbox & mask)
ret_val = E1000_SUCCESS;
hw->dev_spec.vf.v2p_mailbox &= ~mask;
return ret_val;
}
/**
* e1000_check_for_msg_vf - checks to see if the PF has sent mail
* @hw: pointer to the HW structure
* @mbx_id: id of mailbox to check
*
* returns SUCCESS if the PF has set the Status bit or else ERR_MBX
**/
static s32 e1000_check_for_msg_vf(struct e1000_hw *hw, u16 mbx_id)
{
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_check_for_msg_vf");
if (!e1000_check_for_bit_vf(hw, E1000_V2PMAILBOX_PFSTS)) {
ret_val = E1000_SUCCESS;
hw->mbx.stats.reqs++;
}
return ret_val;
}
/**
* e1000_check_for_ack_vf - checks to see if the PF has ACK'd
* @hw: pointer to the HW structure
* @mbx_id: id of mailbox to check
*
* returns SUCCESS if the PF has set the ACK bit or else ERR_MBX
**/
static s32 e1000_check_for_ack_vf(struct e1000_hw *hw, u16 mbx_id)
{
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_check_for_ack_vf");
if (!e1000_check_for_bit_vf(hw, E1000_V2PMAILBOX_PFACK)) {
ret_val = E1000_SUCCESS;
hw->mbx.stats.acks++;
}
return ret_val;
}
/**
* e1000_check_for_rst_vf - checks to see if the PF has reset
* @hw: pointer to the HW structure
* @mbx_id: id of mailbox to check
*
* returns TRUE if the PF has set the reset done bit or else FALSE
**/
static s32 e1000_check_for_rst_vf(struct e1000_hw *hw, u16 mbx_id)
{
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_check_for_rst_vf");
if (!e1000_check_for_bit_vf(hw, (E1000_V2PMAILBOX_RSTD |
E1000_V2PMAILBOX_RSTI))) {
ret_val = E1000_SUCCESS;
hw->mbx.stats.rsts++;
}
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;
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_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 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_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 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_init_mbx_params_vf - set initial values for vf mailbox
* @hw: pointer to the HW structure
*
* Initializes the hw->mbx struct to correct values for vf mailbox
*/
s32 e1000_init_mbx_params_vf(struct e1000_hw *hw)
{
struct e1000_mbx_info *mbx = &hw->mbx;
/* start mailbox as timed out and let the reset_hw call set the timeout
* value to begin communications */
mbx->timeout = 0;
mbx->usec_delay = E1000_VF_MBX_INIT_DELAY;
mbx->size = E1000_VFMAILBOX_SIZE;
mbx->ops.read = e1000_read_mbx_vf;
mbx->ops.write = e1000_write_mbx_vf;
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_vf;
mbx->ops.check_for_ack = e1000_check_for_ack_vf;
mbx->ops.check_for_rst = e1000_check_for_rst_vf;
mbx->stats.msgs_tx = 0;
mbx->stats.msgs_rx = 0;
mbx->stats.reqs = 0;
mbx->stats.acks = 0;
mbx->stats.rsts = 0;
return E1000_SUCCESS;
}
static s32 e1000_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
{
u32 mbvficr = E1000_READ_REG(hw, E1000_MBVFICR);
s32 ret_val = -E1000_ERR_MBX;
if (mbvficr & mask) {
ret_val = E1000_SUCCESS;
E1000_WRITE_REG(hw, E1000_MBVFICR, mask);
}
return ret_val;
}
/**
* e1000_check_for_msg_pf - checks to see if the VF has sent mail
* @hw: pointer to the HW structure
* @vf_number: the VF index
*
* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
**/
static s32 e1000_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
{
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_check_for_msg_pf");
if (!e1000_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
ret_val = E1000_SUCCESS;
hw->mbx.stats.reqs++;
}
return ret_val;
}
/**
* e1000_check_for_ack_pf - checks to see if the VF has ACKed
* @hw: pointer to the HW structure
* @vf_number: the VF index
*
* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
**/
static s32 e1000_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
{
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_check_for_ack_pf");
if (!e1000_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
ret_val = E1000_SUCCESS;
hw->mbx.stats.acks++;
}
return ret_val;
}
/**
* e1000_check_for_rst_pf - checks to see if the VF has reset
* @hw: pointer to the HW structure
* @vf_number: the VF index
*
* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
**/
static s32 e1000_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
{
u32 vflre = E1000_READ_REG(hw, E1000_VFLRE);
s32 ret_val = -E1000_ERR_MBX;
DEBUGFUNC("e1000_check_for_rst_pf");
if (vflre & (1 << vf_number)) {
ret_val = E1000_SUCCESS;
E1000_WRITE_REG(hw, E1000_VFLRE, (1 << vf_number));
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:
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;
}
}