[net-next-2.6.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 (!countdown || !mbx->ops.check_for_msg)
		goto out;

	while (mbx->ops.check_for_msg(hw, mbx_id)) {
		countdown--;
		if (!countdown)
			break;
		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 (!countdown || !mbx->ops.check_for_ack)
		goto out;

	while (mbx->ops.check_for_ack(hw, mbx_id)) {
		countdown--;
		if (!countdown)
			break;
		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_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 igb_obtain_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
{
	s32 ret_val = -E1000_ERR_MBX;
	u32 p2v_mailbox;


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

	/* reserve mailbox for vf use */
	p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
	if (p2v_mailbox & E1000_P2VMAILBOX_PFU)
		ret_val = 0;

	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)
{
	s32 ret_val;
	u16 i;

	/* lock the mailbox to prevent pf/vf race condition */
	ret_val = igb_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 */
	igb_check_for_msg_pf(hw, vf_number);
	igb_check_for_ack_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)
{
	s32 ret_val;
	u16 i;

	/* lock the mailbox to prevent pf/vf race condition */
	ret_val = igb_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] = 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++;

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
3935358e	143	if (!countdown \|\| !mbx->ops.check_for_msg)
4ae196df AD	144	goto out;
	145
	146	while (mbx->ops.check_for_msg(hw, mbx_id)) {
3935358e	147	countdown--;
4ae196df AD	148	if (!countdown)
4ae196df AD	149	break;
4ae196df AD	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
3935358e	168	if (!countdown \|\| !mbx->ops.check_for_ack)
4ae196df AD	169	goto out;
	170
	171	while (mbx->ops.check_for_ack(hw, mbx_id)) {
3935358e	172	countdown--;
4ae196df AD	173	if (!countdown)
4ae196df AD	174	break;
4ae196df AD	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
0acb6fde AD	307	/**
	308	* igb_obtain_mbx_lock_pf - obtain mailbox lock
	309	* @hw: pointer to the HW structure
	310	* @vf_number: the VF index
	311	*
	312	* return SUCCESS if we obtained the mailbox lock
	313	**/
	314	static s32 igb_obtain_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
	315	{
	316	s32 ret_val = -E1000_ERR_MBX;
	317	u32 p2v_mailbox;
	318
	319
	320	/* Take ownership of the buffer */
	321	wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
	322
	323	/* reserve mailbox for vf use */
	324	p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
	325	if (p2v_mailbox & E1000_P2VMAILBOX_PFU)
	326	ret_val = 0;
	327
	328	return ret_val;
	329	}
	330
4ae196df AD	331	/**
	332	* igb_write_mbx_pf - Places a message in the mailbox
	333	* @hw: pointer to the HW structure
	334	* @msg: The message buffer
	335	* @size: Length of buffer
	336	* @vf_number: the VF index
	337	*
	338	* returns SUCCESS if it successfully copied message into the buffer
	339	**/
	340	static s32 igb_write_mbx_pf(struct e1000_hw hw, u32 msg, u16 size,
	341	u16 vf_number)
	342	{
0acb6fde	343	s32 ret_val;
4ae196df AD	344	u16 i;
4ae196df AD	345
0acb6fde AD	346	/* lock the mailbox to prevent pf/vf race condition */
	347	ret_val = igb_obtain_mbx_lock_pf(hw, vf_number);
	348	if (ret_val)
4ae196df	349	goto out_no_write;
4ae196df	350
0acb6fde	351	/* flush msg and acks as we are overwriting the message buffer */
4ae196df	352	igb_check_for_msg_pf(hw, vf_number);
0acb6fde	353	igb_check_for_ack_pf(hw, vf_number);
4ae196df AD	354
	355	/* copy the caller specified message to the mailbox memory buffer */
	356	for (i = 0; i < size; i++)
	357	array_wr32(E1000_VMBMEM(vf_number), i, msg[i]);
	358
	359	/* Interrupt VF to tell it a message has been sent and release buffer*/
	360	wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS);
	361
	362	/* update stats */
	363	hw->mbx.stats.msgs_tx++;
	364
	365	out_no_write:
	366	return ret_val;
	367
	368	}
	369
	370	/**
	371	* igb_read_mbx_pf - Read a message from the mailbox
	372	* @hw: pointer to the HW structure
	373	* @msg: The message buffer
	374	* @size: Length of buffer
	375	* @vf_number: the VF index
	376	*
	377	* This function copies a message from the mailbox buffer to the caller's
	378	* memory buffer. The presumption is that the caller knows that there was
	379	* a message due to a VF request so no polling for message is needed.
	380	**/
	381	static s32 igb_read_mbx_pf(struct e1000_hw hw, u32 msg, u16 size,
	382	u16 vf_number)
	383	{
0acb6fde	384	s32 ret_val;
4ae196df AD	385	u16 i;
4ae196df AD	386
0acb6fde AD	387	/* lock the mailbox to prevent pf/vf race condition */
	388	ret_val = igb_obtain_mbx_lock_pf(hw, vf_number);
	389	if (ret_val)
4ae196df	390	goto out_no_read;
4ae196df AD	391
	392	/* copy the message to the mailbox memory buffer */
	393	for (i = 0; i < size; i++)
	394	msg[i] = array_rd32(E1000_VMBMEM(vf_number), i);
	395
	396	/* Acknowledge the message and release buffer */
	397	wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_ACK);
	398
	399	/* update stats */
	400	hw->mbx.stats.msgs_rx++;
	401
4ae196df AD	402	out_no_read:
	403	return ret_val;
	404	}
	405
	406	/**
	407	* e1000_init_mbx_params_pf - set initial values for pf mailbox
	408	* @hw: pointer to the HW structure
	409	*
	410	* Initializes the hw->mbx struct to correct values for pf mailbox
	411	*/
	412	s32 igb_init_mbx_params_pf(struct e1000_hw *hw)
	413	{
	414	struct e1000_mbx_info *mbx = &hw->mbx;
	415
	416	if (hw->mac.type == e1000_82576) {
	417	mbx->timeout = 0;
	418	mbx->usec_delay = 0;
	419
	420	mbx->size = E1000_VFMAILBOX_SIZE;
	421
	422	mbx->ops.read = igb_read_mbx_pf;
	423	mbx->ops.write = igb_write_mbx_pf;
	424	mbx->ops.read_posted = igb_read_posted_mbx;
	425	mbx->ops.write_posted = igb_write_posted_mbx;
	426	mbx->ops.check_for_msg = igb_check_for_msg_pf;
	427	mbx->ops.check_for_ack = igb_check_for_ack_pf;
	428	mbx->ops.check_for_rst = igb_check_for_rst_pf;
	429
	430	mbx->stats.msgs_tx = 0;
	431	mbx->stats.msgs_rx = 0;
	432	mbx->stats.reqs = 0;
	433	mbx->stats.acks = 0;
	434	mbx->stats.rsts = 0;
	435	}
	436
	437	return 0;
	438	}
	439