1
/*******************************************************************************
3
Intel(R) Gigabit Ethernet Linux driver
4
Copyright(c) 2007-2011 Intel Corporation.
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.
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
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.
19
The full GNU General Public License is included in this distribution in
20
the file called "COPYING".
23
e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
24
Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
*******************************************************************************/
28
#include "e1000_mbx.h"
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
37
* returns SUCCESS if it successfully read message from buffer
39
s32 igb_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
41
struct e1000_mbx_info *mbx = &hw->mbx;
42
s32 ret_val = -E1000_ERR_MBX;
44
/* limit read to size of mailbox */
49
ret_val = mbx->ops.read(hw, msg, size, mbx_id);
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
61
* returns SUCCESS if it successfully copied message into the buffer
63
s32 igb_write_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
65
struct e1000_mbx_info *mbx = &hw->mbx;
69
ret_val = -E1000_ERR_MBX;
71
else if (mbx->ops.write)
72
ret_val = mbx->ops.write(hw, msg, size, mbx_id);
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
82
* returns SUCCESS if the Status bit was found or else ERR_MBX
84
s32 igb_check_for_msg(struct e1000_hw *hw, u16 mbx_id)
86
struct e1000_mbx_info *mbx = &hw->mbx;
87
s32 ret_val = -E1000_ERR_MBX;
89
if (mbx->ops.check_for_msg)
90
ret_val = mbx->ops.check_for_msg(hw, mbx_id);
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
100
* returns SUCCESS if the Status bit was found or else ERR_MBX
102
s32 igb_check_for_ack(struct e1000_hw *hw, u16 mbx_id)
104
struct e1000_mbx_info *mbx = &hw->mbx;
105
s32 ret_val = -E1000_ERR_MBX;
107
if (mbx->ops.check_for_ack)
108
ret_val = mbx->ops.check_for_ack(hw, mbx_id);
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
118
* returns SUCCESS if the Status bit was found or else ERR_MBX
120
s32 igb_check_for_rst(struct e1000_hw *hw, u16 mbx_id)
122
struct e1000_mbx_info *mbx = &hw->mbx;
123
s32 ret_val = -E1000_ERR_MBX;
125
if (mbx->ops.check_for_rst)
126
ret_val = mbx->ops.check_for_rst(hw, mbx_id);
132
* igb_poll_for_msg - Wait for message notification
133
* @hw: pointer to the HW structure
134
* @mbx_id: id of mailbox to write
136
* returns SUCCESS if it successfully received a message notification
138
static s32 igb_poll_for_msg(struct e1000_hw *hw, u16 mbx_id)
140
struct e1000_mbx_info *mbx = &hw->mbx;
141
int countdown = mbx->timeout;
143
if (!countdown || !mbx->ops.check_for_msg)
146
while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
150
udelay(mbx->usec_delay);
153
/* if we failed, all future posted messages fail until reset */
157
return countdown ? 0 : -E1000_ERR_MBX;
161
* igb_poll_for_ack - Wait for message acknowledgement
162
* @hw: pointer to the HW structure
163
* @mbx_id: id of mailbox to write
165
* returns SUCCESS if it successfully received a message acknowledgement
167
static s32 igb_poll_for_ack(struct e1000_hw *hw, u16 mbx_id)
169
struct e1000_mbx_info *mbx = &hw->mbx;
170
int countdown = mbx->timeout;
172
if (!countdown || !mbx->ops.check_for_ack)
175
while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
179
udelay(mbx->usec_delay);
182
/* if we failed, all future posted messages fail until reset */
186
return countdown ? 0 : -E1000_ERR_MBX;
190
* igb_read_posted_mbx - Wait for message notification and receive message
191
* @hw: pointer to the HW structure
192
* @msg: The message buffer
193
* @size: Length of buffer
194
* @mbx_id: id of mailbox to write
196
* returns SUCCESS if it successfully received a message notification and
197
* copied it into the receive buffer.
199
static s32 igb_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
201
struct e1000_mbx_info *mbx = &hw->mbx;
202
s32 ret_val = -E1000_ERR_MBX;
207
ret_val = igb_poll_for_msg(hw, mbx_id);
210
ret_val = mbx->ops.read(hw, msg, size, mbx_id);
216
* igb_write_posted_mbx - Write a message to the mailbox, wait for ack
217
* @hw: pointer to the HW structure
218
* @msg: The message buffer
219
* @size: Length of buffer
220
* @mbx_id: id of mailbox to write
222
* returns SUCCESS if it successfully copied message into the buffer and
223
* received an ack to that message within delay * timeout period
225
static s32 igb_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
227
struct e1000_mbx_info *mbx = &hw->mbx;
228
s32 ret_val = -E1000_ERR_MBX;
230
/* exit if either we can't write or there isn't a defined timeout */
231
if (!mbx->ops.write || !mbx->timeout)
235
ret_val = mbx->ops.write(hw, msg, size, mbx_id);
237
/* if msg sent wait until we receive an ack */
239
ret_val = igb_poll_for_ack(hw, mbx_id);
244
static s32 igb_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
246
u32 mbvficr = rd32(E1000_MBVFICR);
247
s32 ret_val = -E1000_ERR_MBX;
249
if (mbvficr & mask) {
251
wr32(E1000_MBVFICR, mask);
258
* igb_check_for_msg_pf - checks to see if the VF has sent mail
259
* @hw: pointer to the HW structure
260
* @vf_number: the VF index
262
* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
264
static s32 igb_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
266
s32 ret_val = -E1000_ERR_MBX;
268
if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
270
hw->mbx.stats.reqs++;
277
* igb_check_for_ack_pf - checks to see if the VF has ACKed
278
* @hw: pointer to the HW structure
279
* @vf_number: the VF index
281
* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
283
static s32 igb_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
285
s32 ret_val = -E1000_ERR_MBX;
287
if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
289
hw->mbx.stats.acks++;
296
* igb_check_for_rst_pf - checks to see if the VF has reset
297
* @hw: pointer to the HW structure
298
* @vf_number: the VF index
300
* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
302
static s32 igb_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
304
u32 vflre = rd32(E1000_VFLRE);
305
s32 ret_val = -E1000_ERR_MBX;
307
if (vflre & (1 << vf_number)) {
309
wr32(E1000_VFLRE, (1 << vf_number));
310
hw->mbx.stats.rsts++;
317
* igb_obtain_mbx_lock_pf - obtain mailbox lock
318
* @hw: pointer to the HW structure
319
* @vf_number: the VF index
321
* return SUCCESS if we obtained the mailbox lock
323
static s32 igb_obtain_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
325
s32 ret_val = -E1000_ERR_MBX;
329
/* Take ownership of the buffer */
330
wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
332
/* reserve mailbox for vf use */
333
p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
334
if (p2v_mailbox & E1000_P2VMAILBOX_PFU)
341
* igb_write_mbx_pf - Places a message in the mailbox
342
* @hw: pointer to the HW structure
343
* @msg: The message buffer
344
* @size: Length of buffer
345
* @vf_number: the VF index
347
* returns SUCCESS if it successfully copied message into the buffer
349
static s32 igb_write_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
355
/* lock the mailbox to prevent pf/vf race condition */
356
ret_val = igb_obtain_mbx_lock_pf(hw, vf_number);
360
/* flush msg and acks as we are overwriting the message buffer */
361
igb_check_for_msg_pf(hw, vf_number);
362
igb_check_for_ack_pf(hw, vf_number);
364
/* copy the caller specified message to the mailbox memory buffer */
365
for (i = 0; i < size; i++)
366
array_wr32(E1000_VMBMEM(vf_number), i, msg[i]);
368
/* Interrupt VF to tell it a message has been sent and release buffer*/
369
wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS);
372
hw->mbx.stats.msgs_tx++;
380
* igb_read_mbx_pf - Read a message from the mailbox
381
* @hw: pointer to the HW structure
382
* @msg: The message buffer
383
* @size: Length of buffer
384
* @vf_number: the VF index
386
* This function copies a message from the mailbox buffer to the caller's
387
* memory buffer. The presumption is that the caller knows that there was
388
* a message due to a VF request so no polling for message is needed.
390
static s32 igb_read_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
396
/* lock the mailbox to prevent pf/vf race condition */
397
ret_val = igb_obtain_mbx_lock_pf(hw, vf_number);
401
/* copy the message to the mailbox memory buffer */
402
for (i = 0; i < size; i++)
403
msg[i] = array_rd32(E1000_VMBMEM(vf_number), i);
405
/* Acknowledge the message and release buffer */
406
wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_ACK);
409
hw->mbx.stats.msgs_rx++;
416
* e1000_init_mbx_params_pf - set initial values for pf mailbox
417
* @hw: pointer to the HW structure
419
* Initializes the hw->mbx struct to correct values for pf mailbox
421
s32 igb_init_mbx_params_pf(struct e1000_hw *hw)
423
struct e1000_mbx_info *mbx = &hw->mbx;
428
mbx->size = E1000_VFMAILBOX_SIZE;
430
mbx->ops.read = igb_read_mbx_pf;
431
mbx->ops.write = igb_write_mbx_pf;
432
mbx->ops.read_posted = igb_read_posted_mbx;
433
mbx->ops.write_posted = igb_write_posted_mbx;
434
mbx->ops.check_for_msg = igb_check_for_msg_pf;
435
mbx->ops.check_for_ack = igb_check_for_ack_pf;
436
mbx->ops.check_for_rst = igb_check_for_rst_pf;
438
mbx->stats.msgs_tx = 0;
439
mbx->stats.msgs_rx = 0;