[deliverable/linux.git] / drivers / net / igb / e1000_mbx.c

/*******************************************************************************

  Intel(R) Gigabit Ethernet Linux driver
  Copyright(c) 2007-2009 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

#include "e1000_mbx.h"

/**
 *  igb_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 igb_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;

	/* 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;
}

/**
 *  igb_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 igb_write_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
{
	struct e1000_mbx_info *mbx = &hw->mbx;
	s32 ret_val = 0;

	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;
}

/**
 *  igb_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 igb_check_for_msg(struct e1000_hw *hw, u16 mbx_id)
{
	struct e1000_mbx_info *mbx = &hw->mbx;
	s32 ret_val = -E1000_ERR_MBX;

	if (mbx->ops.check_for_msg)
		ret_val = mbx->ops.check_for_msg(hw, mbx_id);

	return ret_val;
}

/**
 *  igb_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 igb_check_for_ack(struct e1000_hw *hw, u16 mbx_id)
{
	struct e1000_mbx_info *mbx = &hw->mbx;
	s32 ret_val = -E1000_ERR_MBX;

	if (mbx->ops.check_for_ack)
		ret_val = mbx->ops.check_for_ack(hw, mbx_id);

	return ret_val;
}

/**
 *  igb_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 igb_check_for_rst(struct e1000_hw *hw, u16 mbx_id)
{
	struct e1000_mbx_info *mbx = &hw->mbx;
	s32 ret_val = -E1000_ERR_MBX;

	if (mbx->ops.check_for_rst)
		ret_val = mbx->ops.check_for_rst(hw, mbx_id);

	return ret_val;
}

/**
 *  igb_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 igb_poll_for_msg(struct e1000_hw *hw, u16 mbx_id)
{
	struct e1000_mbx_info *mbx = &hw->mbx;
	int countdown = mbx->timeout;

	if (!mbx->ops.check_for_msg)
		goto out;

	while (mbx->ops.check_for_msg(hw, mbx_id)) {
		if (!countdown)
			break;
		countdown--;
		udelay(mbx->usec_delay);
	}
out:
	return countdown ? 0 : -E1000_ERR_MBX;
}

/**
 *  igb_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 igb_poll_for_ack(struct e1000_hw *hw, u16 mbx_id)
{
	struct e1000_mbx_info *mbx = &hw->mbx;
	int countdown = mbx->timeout;

	if (!mbx->ops.check_for_ack)
		goto out;

	while (mbx->ops.check_for_ack(hw, mbx_id)) {
		if (!countdown)
			break;
		countdown--;
		udelay(mbx->usec_delay);
	}
out:
	return countdown ? 0 : -E1000_ERR_MBX;
}

/**
 *  igb_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.
 **/
static s32 igb_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;

	if (!mbx->ops.read)
		goto out;

	ret_val = igb_poll_for_msg(hw, mbx_id);

	if (!ret_val)
		ret_val = mbx->ops.read(hw, msg, size, mbx_id);
out:
	return ret_val;
}

/**
 *  igb_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
 **/
static s32 igb_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
{
	struct e1000_mbx_info *mbx = &hw->mbx;
	s32 ret_val = 0;

	if (!mbx->ops.write)
		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 = igb_poll_for_ack(hw, mbx_id);
out:
	return ret_val;
}

static s32 igb_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
{
	u32 mbvficr = rd32(E1000_MBVFICR);
	s32 ret_val = -E1000_ERR_MBX;

	if (mbvficr & mask) {
		ret_val = 0;
		wr32(E1000_MBVFICR, mask);
	}

	return ret_val;
}

/**
 *  igb_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 igb_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
{
	s32 ret_val = -E1000_ERR_MBX;

	if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
		ret_val = 0;
		hw->mbx.stats.reqs++;
	}

	return ret_val;
}

/**
 *  igb_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 igb_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
{
	s32 ret_val = -E1000_ERR_MBX;

	if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
		ret_val = 0;
		hw->mbx.stats.acks++;
	}

	return ret_val;
}

/**
 *  igb_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 igb_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
{
	u32 vflre = rd32(E1000_VFLRE);
	s32 ret_val = -E1000_ERR_MBX;

	if (vflre & (1 << vf_number)) {
		ret_val = 0;
		wr32(E1000_VFLRE, (1 << vf_number));
		hw->mbx.stats.rsts++;
	}

	return ret_val;
}

/**
 *  igb_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 igb_write_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
                              u16 vf_number)
{
	u32 p2v_mailbox;
	s32 ret_val = 0;
	u16 i;

	/* Take ownership of the buffer */
	wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);

	/* Make sure we have ownership now... */
	p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
	if (!(p2v_mailbox & E1000_P2VMAILBOX_PFU)) {
		/* failed to grab ownership */
		ret_val = -E1000_ERR_MBX;
		goto out_no_write;
	}

	/*
	 * flush any ack or msg which may already be in the queue
	 * as they are likely the result of an error
	 */
	igb_check_for_ack_pf(hw, vf_number);
	igb_check_for_msg_pf(hw, vf_number);

	/* copy the caller specified message to the mailbox memory buffer */
	for (i = 0; i < size; i++)
		array_wr32(E1000_VMBMEM(vf_number), i, msg[i]);

	/* Interrupt VF to tell it a message has been sent and release buffer*/
	wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS);

	/* update stats */
	hw->mbx.stats.msgs_tx++;

out_no_write:
	return ret_val;

}

/**
 *  igb_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 igb_read_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
                             u16 vf_number)
{
	u32 p2v_mailbox;
	s32 ret_val = 0;
	u16 i;

	/* Take ownership of the buffer */
	wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);

	/* Make sure we have ownership now... */
	p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
	if (!(p2v_mailbox & E1000_P2VMAILBOX_PFU)) {
		/* failed to grab ownership */
		ret_val = -E1000_ERR_MBX;
		goto out_no_read;
	}

	/* copy the message to the mailbox memory buffer */
	for (i = 0; i < size; i++)
		msg[i] = array_rd32(E1000_VMBMEM(vf_number), i);

	/* Acknowledge the message and release buffer */
	wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_ACK);

	/* update stats */
	hw->mbx.stats.msgs_rx++;

	ret_val = 0;

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 igb_init_mbx_params_pf(struct e1000_hw *hw)
{
	struct e1000_mbx_info *mbx = &hw->mbx;

	if (hw->mac.type == e1000_82576) {
		mbx->timeout = 0;
		mbx->usec_delay = 0;

		mbx->size = E1000_VFMAILBOX_SIZE;

		mbx->ops.read = igb_read_mbx_pf;
		mbx->ops.write = igb_write_mbx_pf;
		mbx->ops.read_posted = igb_read_posted_mbx;
		mbx->ops.write_posted = igb_write_posted_mbx;
		mbx->ops.check_for_msg = igb_check_for_msg_pf;
		mbx->ops.check_for_ack = igb_check_for_ack_pf;
		mbx->ops.check_for_rst = igb_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;
	}

	return 0;
}
Commit	Line	Data
4ae196df AD	1	/*******************************************************************************
	2
	3	Intel(R) Gigabit Ethernet Linux driver
	4	Copyright(c) 2007-2009 Intel Corporation.
	5
	6	This program is free software; you can redistribute it and/or modify it
	7	under the terms and conditions of the GNU General Public License,
	8	version 2, as published by the Free Software Foundation.
	9
	10	This program is distributed in the hope it will be useful, but WITHOUT
	11	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	more details.
	14
	15	You should have received a copy of the GNU General Public License along with
	16	this program; if not, write to the Free Software Foundation, Inc.,
	17	51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	18
	19	The full GNU General Public License is included in this distribution in
	20	the file called "COPYING".
	21
	22	Contact Information:
	23	e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
	24	Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	25
	26	*******************************************************************************/
	27
	28	#include "e1000_mbx.h"
	29
	30	/**
	31	* igb_read_mbx - Reads a message from the mailbox
	32	* @hw: pointer to the HW structure
	33	* @msg: The message buffer
	34	* @size: Length of buffer
	35	* @mbx_id: id of mailbox to read
	36	*
	37	* returns SUCCESS if it successfuly read message from buffer
	38	**/
	39	s32 igb_read_mbx(struct e1000_hw hw, u32 msg, u16 size, u16 mbx_id)
	40	{
	41	struct e1000_mbx_info *mbx = &hw->mbx;
	42	s32 ret_val = -E1000_ERR_MBX;
	43
	44	/* limit read to size of mailbox */
	45	if (size > mbx->size)
	46	size = mbx->size;
	47
	48	if (mbx->ops.read)
	49	ret_val = mbx->ops.read(hw, msg, size, mbx_id);
	50
	51	return ret_val;
	52	}
	53
	54	/**
	55	* igb_write_mbx - Write a message to the mailbox
	56	* @hw: pointer to the HW structure
	57	* @msg: The message buffer
	58	* @size: Length of buffer
	59	* @mbx_id: id of mailbox to write
	60	*
	61	* returns SUCCESS if it successfully copied message into the buffer
	62	**/
	63	s32 igb_write_mbx(struct e1000_hw hw, u32 msg, u16 size, u16 mbx_id)
	64	{
65	struct e1000_mbx_info *mbx = &hw->mbx;
66	s32 ret_val = 0;
67
68	if (size > mbx->size)
69	ret_val = -E1000_ERR_MBX;
70
71	else if (mbx->ops.write)
72	ret_val = mbx->ops.write(hw, msg, size, mbx_id);
73
74	return ret_val;
75	}
76
77	/**
78	* igb_check_for_msg - checks to see if someone sent us mail
79	* @hw: pointer to the HW structure
80	* @mbx_id: id of mailbox to check
81	*
82	* returns SUCCESS if the Status bit was found or else ERR_MBX
83	**/
84	s32 igb_check_for_msg(struct e1000_hw *hw, u16 mbx_id)
85	{
86	struct e1000_mbx_info *mbx = &hw->mbx;
87	s32 ret_val = -E1000_ERR_MBX;
88
89	if (mbx->ops.check_for_msg)
90	ret_val = mbx->ops.check_for_msg(hw, mbx_id);
91
92	return ret_val;
93	}
94
95	/**
96	* igb_check_for_ack - checks to see if someone sent us ACK
97	* @hw: pointer to the HW structure
98	* @mbx_id: id of mailbox to check
99	*
100	* returns SUCCESS if the Status bit was found or else ERR_MBX
101	**/
102	s32 igb_check_for_ack(struct e1000_hw *hw, u16 mbx_id)
103	{
104	struct e1000_mbx_info *mbx = &hw->mbx;
105	s32 ret_val = -E1000_ERR_MBX;
106
107	if (mbx->ops.check_for_ack)
108	ret_val = mbx->ops.check_for_ack(hw, mbx_id);
109
110	return ret_val;
111	}
112
113	/**
114	* igb_check_for_rst - checks to see if other side has reset
115	* @hw: pointer to the HW structure
116	* @mbx_id: id of mailbox to check
117	*
118	* returns SUCCESS if the Status bit was found or else ERR_MBX
119	**/
120	s32 igb_check_for_rst(struct e1000_hw *hw, u16 mbx_id)
121	{
122	struct e1000_mbx_info *mbx = &hw->mbx;
123	s32 ret_val = -E1000_ERR_MBX;
124
125	if (mbx->ops.check_for_rst)
126	ret_val = mbx->ops.check_for_rst(hw, mbx_id);
127
128	return ret_val;
129	}
130
131	/**
132	* igb_poll_for_msg - Wait for message notification
133	* @hw: pointer to the HW structure
134	* @mbx_id: id of mailbox to write
135	*
136	* returns SUCCESS if it successfully received a message notification
137	**/
138	static s32 igb_poll_for_msg(struct e1000_hw *hw, u16 mbx_id)
139	{
140	struct e1000_mbx_info *mbx = &hw->mbx;
141	int countdown = mbx->timeout;
142
143	if (!mbx->ops.check_for_msg)
144	goto out;
145
146	while (mbx->ops.check_for_msg(hw, mbx_id)) {
147	if (!countdown)
148	break;
149	countdown--;
150	udelay(mbx->usec_delay);
151	}
152	out:
153	return countdown ? 0 : -E1000_ERR_MBX;
154	}
155
156	/**
157	* igb_poll_for_ack - Wait for message acknowledgement
158	* @hw: pointer to the HW structure
159	* @mbx_id: id of mailbox to write
160	*
161	* returns SUCCESS if it successfully received a message acknowledgement
162	**/
163	static s32 igb_poll_for_ack(struct e1000_hw *hw, u16 mbx_id)
164	{
165	struct e1000_mbx_info *mbx = &hw->mbx;
166	int countdown = mbx->timeout;
167
168	if (!mbx->ops.check_for_ack)
169	goto out;
170
171	while (mbx->ops.check_for_ack(hw, mbx_id)) {
172	if (!countdown)
173	break;
174	countdown--;
175	udelay(mbx->usec_delay);
176	}
177	out:
178	return countdown ? 0 : -E1000_ERR_MBX;
179	}
180
181	/**
182	* igb_read_posted_mbx - Wait for message notification and receive message
183	* @hw: pointer to the HW structure
184	* @msg: The message buffer
185	* @size: Length of buffer
186	* @mbx_id: id of mailbox to write
187	*
188	* returns SUCCESS if it successfully received a message notification and
189	* copied it into the receive buffer.
190	**/
ff6f63dd	191	static s32 igb_read_posted_mbx(struct e1000_hw hw, u32 msg, u16 size, u16 mbx_id)
4ae196df AD	192	{
	193	struct e1000_mbx_info *mbx = &hw->mbx;
	194	s32 ret_val = -E1000_ERR_MBX;
	195
	196	if (!mbx->ops.read)
	197	goto out;
	198
	199	ret_val = igb_poll_for_msg(hw, mbx_id);
	200
	201	if (!ret_val)
	202	ret_val = mbx->ops.read(hw, msg, size, mbx_id);
	203	out:
	204	return ret_val;
	205	}
	206
	207	/**
	208	* igb_write_posted_mbx - Write a message to the mailbox, wait for ack
	209	* @hw: pointer to the HW structure
	210	* @msg: The message buffer
	211	* @size: Length of buffer
	212	* @mbx_id: id of mailbox to write
	213	*
	214	* returns SUCCESS if it successfully copied message into the buffer and
	215	* received an ack to that message within delay * timeout period
	216	**/
ff6f63dd	217	static s32 igb_write_posted_mbx(struct e1000_hw hw, u32 msg, u16 size, u16 mbx_id)
4ae196df AD	218	{
	219	struct e1000_mbx_info *mbx = &hw->mbx;
	220	s32 ret_val = 0;
	221
	222	if (!mbx->ops.write)
	223	goto out;
	224
	225	/* send msg*/
	226	ret_val = mbx->ops.write(hw, msg, size, mbx_id);
	227
	228	/* if msg sent wait until we receive an ack */
	229	if (!ret_val)
	230	ret_val = igb_poll_for_ack(hw, mbx_id);
	231	out:
	232	return ret_val;
	233	}
	234
4ae196df AD	235	static s32 igb_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
	236	{
	237	u32 mbvficr = rd32(E1000_MBVFICR);
	238	s32 ret_val = -E1000_ERR_MBX;
	239
	240	if (mbvficr & mask) {
	241	ret_val = 0;
	242	wr32(E1000_MBVFICR, mask);
	243	}
	244
	245	return ret_val;
	246	}
	247
	248	/**
	249	* igb_check_for_msg_pf - checks to see if the VF has sent mail
	250	* @hw: pointer to the HW structure
	251	* @vf_number: the VF index
	252	*
	253	* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
	254	**/
	255	static s32 igb_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
	256	{
	257	s32 ret_val = -E1000_ERR_MBX;
	258
	259	if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
	260	ret_val = 0;
	261	hw->mbx.stats.reqs++;
	262	}
	263
	264	return ret_val;
	265	}
	266
	267	/**
	268	* igb_check_for_ack_pf - checks to see if the VF has ACKed
	269	* @hw: pointer to the HW structure
	270	* @vf_number: the VF index
	271	*
	272	* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
	273	**/
	274	static s32 igb_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
	275	{
	276	s32 ret_val = -E1000_ERR_MBX;
	277
	278	if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
	279	ret_val = 0;
	280	hw->mbx.stats.acks++;
	281	}
	282
	283	return ret_val;
	284	}
	285
	286	/**
	287	* igb_check_for_rst_pf - checks to see if the VF has reset
	288	* @hw: pointer to the HW structure
	289	* @vf_number: the VF index
	290	*
	291	* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
	292	**/
	293	static s32 igb_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
	294	{
	295	u32 vflre = rd32(E1000_VFLRE);
	296	s32 ret_val = -E1000_ERR_MBX;
	297
	298	if (vflre & (1 << vf_number)) {
299	ret_val = 0;
300	wr32(E1000_VFLRE, (1 << vf_number));
301	hw->mbx.stats.rsts++;
302	}
303
304	return ret_val;
305	}
306
307	/**
308	* igb_write_mbx_pf - Places a message in the mailbox
309	* @hw: pointer to the HW structure
310	* @msg: The message buffer
311	* @size: Length of buffer
312	* @vf_number: the VF index
313	*
314	* returns SUCCESS if it successfully copied message into the buffer
315	**/
316	static s32 igb_write_mbx_pf(struct e1000_hw hw, u32 msg, u16 size,
317	u16 vf_number)
318	{
319	u32 p2v_mailbox;
320	s32 ret_val = 0;
321	u16 i;
322
323	/* Take ownership of the buffer */
324	wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
325
326	/* Make sure we have ownership now... */
327	p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
328	if (!(p2v_mailbox & E1000_P2VMAILBOX_PFU)) {
329	/* failed to grab ownership */
330	ret_val = -E1000_ERR_MBX;
331	goto out_no_write;
332	}
333
334	/*
335	* flush any ack or msg which may already be in the queue
336	* as they are likely the result of an error
337	*/
338	igb_check_for_ack_pf(hw, vf_number);
339	igb_check_for_msg_pf(hw, vf_number);
340
341	/* copy the caller specified message to the mailbox memory buffer */
342	for (i = 0; i < size; i++)
343	array_wr32(E1000_VMBMEM(vf_number), i, msg[i]);
344
345	/* Interrupt VF to tell it a message has been sent and release buffer*/
346	wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS);
347
348	/* update stats */
349	hw->mbx.stats.msgs_tx++;
350
351	out_no_write:
352	return ret_val;
353
354	}
355
356	/**
357	* igb_read_mbx_pf - Read a message from the mailbox
358	* @hw: pointer to the HW structure
359	* @msg: The message buffer
360	* @size: Length of buffer
361	* @vf_number: the VF index
362	*
363	* This function copies a message from the mailbox buffer to the caller's
364	* memory buffer. The presumption is that the caller knows that there was
365	* a message due to a VF request so no polling for message is needed.
366	**/
367	static s32 igb_read_mbx_pf(struct e1000_hw hw, u32 msg, u16 size,
368	u16 vf_number)
369	{
370	u32 p2v_mailbox;
371	s32 ret_val = 0;
372	u16 i;
373
374	/* Take ownership of the buffer */
375	wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
376
377	/* Make sure we have ownership now... */
378	p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
379	if (!(p2v_mailbox & E1000_P2VMAILBOX_PFU)) {
380	/* failed to grab ownership */
381	ret_val = -E1000_ERR_MBX;
382	goto out_no_read;
383	}
384
385	/* copy the message to the mailbox memory buffer */
386	for (i = 0; i < size; i++)
387	msg[i] = array_rd32(E1000_VMBMEM(vf_number), i);
388
389	/* Acknowledge the message and release buffer */
390	wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_ACK);
391
392	/* update stats */
393	hw->mbx.stats.msgs_rx++;
394
395	ret_val = 0;
396
397	out_no_read:
398	return ret_val;
399	}
400
401	/**
402	* e1000_init_mbx_params_pf - set initial values for pf mailbox
403	* @hw: pointer to the HW structure
404	*
405	* Initializes the hw->mbx struct to correct values for pf mailbox
406	*/
407	s32 igb_init_mbx_params_pf(struct e1000_hw *hw)
408	{
409	struct e1000_mbx_info *mbx = &hw->mbx;
410
411	if (hw->mac.type == e1000_82576) {
412	mbx->timeout = 0;
413	mbx->usec_delay = 0;
414
415	mbx->size = E1000_VFMAILBOX_SIZE;
416
417	mbx->ops.read = igb_read_mbx_pf;
418	mbx->ops.write = igb_write_mbx_pf;
419	mbx->ops.read_posted = igb_read_posted_mbx;
420	mbx->ops.write_posted = igb_write_posted_mbx;
421	mbx->ops.check_for_msg = igb_check_for_msg_pf;
422	mbx->ops.check_for_ack = igb_check_for_ack_pf;
423	mbx->ops.check_for_rst = igb_check_for_rst_pf;
424
425	mbx->stats.msgs_tx = 0;
426	mbx->stats.msgs_rx = 0;
427	mbx->stats.reqs = 0;
428	mbx->stats.acks = 0;
429	mbx->stats.rsts = 0;
430	}
431
432	return 0;
433	}
434