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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright(c) 2007 - 2018 Intel Corporation. */
3
4#include "e1000_mbx.h"
5
6/**
7 * igb_read_mbx - Reads a message from the mailbox
8 * @hw: pointer to the HW structure
9 * @msg: The message buffer
10 * @size: Length of buffer
11 * @mbx_id: id of mailbox to read
12 * @unlock: skip locking or not
13 *
14 * returns SUCCESS if it successfully read message from buffer
15 **/
16s32 igb_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id,
17 bool unlock)
18{
19 struct e1000_mbx_info *mbx = &hw->mbx;
20 s32 ret_val = -E1000_ERR_MBX;
21
22 /* limit read to size of mailbox */
23 if (size > mbx->size)
24 size = mbx->size;
25
26 if (mbx->ops.read)
27 ret_val = mbx->ops.read(hw, msg, size, mbx_id, unlock);
28
29 return ret_val;
30}
31
32/**
33 * igb_write_mbx - Write a message to the mailbox
34 * @hw: pointer to the HW structure
35 * @msg: The message buffer
36 * @size: Length of buffer
37 * @mbx_id: id of mailbox to write
38 *
39 * returns SUCCESS if it successfully copied message into the buffer
40 **/
41s32 igb_write_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
42{
43 struct e1000_mbx_info *mbx = &hw->mbx;
44 s32 ret_val = 0;
45
46 if (size > mbx->size)
47 ret_val = -E1000_ERR_MBX;
48
49 else if (mbx->ops.write)
50 ret_val = mbx->ops.write(hw, msg, size, mbx_id);
51
52 return ret_val;
53}
54
55/**
56 * igb_check_for_msg - checks to see if someone sent us mail
57 * @hw: pointer to the HW structure
58 * @mbx_id: id of mailbox to check
59 *
60 * returns SUCCESS if the Status bit was found or else ERR_MBX
61 **/
62s32 igb_check_for_msg(struct e1000_hw *hw, u16 mbx_id)
63{
64 struct e1000_mbx_info *mbx = &hw->mbx;
65 s32 ret_val = -E1000_ERR_MBX;
66
67 if (mbx->ops.check_for_msg)
68 ret_val = mbx->ops.check_for_msg(hw, mbx_id);
69
70 return ret_val;
71}
72
73/**
74 * igb_check_for_ack - checks to see if someone sent us ACK
75 * @hw: pointer to the HW structure
76 * @mbx_id: id of mailbox to check
77 *
78 * returns SUCCESS if the Status bit was found or else ERR_MBX
79 **/
80s32 igb_check_for_ack(struct e1000_hw *hw, u16 mbx_id)
81{
82 struct e1000_mbx_info *mbx = &hw->mbx;
83 s32 ret_val = -E1000_ERR_MBX;
84
85 if (mbx->ops.check_for_ack)
86 ret_val = mbx->ops.check_for_ack(hw, mbx_id);
87
88 return ret_val;
89}
90
91/**
92 * igb_check_for_rst - checks to see if other side has reset
93 * @hw: pointer to the HW structure
94 * @mbx_id: id of mailbox to check
95 *
96 * returns SUCCESS if the Status bit was found or else ERR_MBX
97 **/
98s32 igb_check_for_rst(struct e1000_hw *hw, u16 mbx_id)
99{
100 struct e1000_mbx_info *mbx = &hw->mbx;
101 s32 ret_val = -E1000_ERR_MBX;
102
103 if (mbx->ops.check_for_rst)
104 ret_val = mbx->ops.check_for_rst(hw, mbx_id);
105
106 return ret_val;
107}
108
109/**
110 * igb_unlock_mbx - unlock the mailbox
111 * @hw: pointer to the HW structure
112 * @mbx_id: id of mailbox to check
113 *
114 * returns SUCCESS if the mailbox was unlocked or else ERR_MBX
115 **/
116s32 igb_unlock_mbx(struct e1000_hw *hw, u16 mbx_id)
117{
118 struct e1000_mbx_info *mbx = &hw->mbx;
119 s32 ret_val = -E1000_ERR_MBX;
120
121 if (mbx->ops.unlock)
122 ret_val = mbx->ops.unlock(hw, mbx_id);
123
124 return ret_val;
125}
126
127/**
128 * igb_poll_for_msg - Wait for message notification
129 * @hw: pointer to the HW structure
130 * @mbx_id: id of mailbox to write
131 *
132 * returns SUCCESS if it successfully received a message notification
133 **/
134static s32 igb_poll_for_msg(struct e1000_hw *hw, u16 mbx_id)
135{
136 struct e1000_mbx_info *mbx = &hw->mbx;
137 int countdown = mbx->timeout;
138
139 if (!countdown || !mbx->ops.check_for_msg)
140 goto out;
141
142 while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
143 countdown--;
144 if (!countdown)
145 break;
146 udelay(mbx->usec_delay);
147 }
148
149 /* if we failed, all future posted messages fail until reset */
150 if (!countdown)
151 mbx->timeout = 0;
152out:
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 **/
163static 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 (!countdown || !mbx->ops.check_for_ack)
169 goto out;
170
171 while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
172 countdown--;
173 if (!countdown)
174 break;
175 udelay(mbx->usec_delay);
176 }
177
178 /* if we failed, all future posted messages fail until reset */
179 if (!countdown)
180 mbx->timeout = 0;
181out:
182 return countdown ? 0 : -E1000_ERR_MBX;
183}
184
185/**
186 * igb_read_posted_mbx - Wait for message notification and receive message
187 * @hw: pointer to the HW structure
188 * @msg: The message buffer
189 * @size: Length of buffer
190 * @mbx_id: id of mailbox to write
191 *
192 * returns SUCCESS if it successfully received a message notification and
193 * copied it into the receive buffer.
194 **/
195static s32 igb_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size,
196 u16 mbx_id)
197{
198 struct e1000_mbx_info *mbx = &hw->mbx;
199 s32 ret_val = -E1000_ERR_MBX;
200
201 if (!mbx->ops.read)
202 goto out;
203
204 ret_val = igb_poll_for_msg(hw, mbx_id);
205
206 if (!ret_val)
207 ret_val = mbx->ops.read(hw, msg, size, mbx_id, true);
208out:
209 return ret_val;
210}
211
212/**
213 * igb_write_posted_mbx - Write a message to the mailbox, wait for ack
214 * @hw: pointer to the HW structure
215 * @msg: The message buffer
216 * @size: Length of buffer
217 * @mbx_id: id of mailbox to write
218 *
219 * returns SUCCESS if it successfully copied message into the buffer and
220 * received an ack to that message within delay * timeout period
221 **/
222static s32 igb_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size,
223 u16 mbx_id)
224{
225 struct e1000_mbx_info *mbx = &hw->mbx;
226 s32 ret_val = -E1000_ERR_MBX;
227
228 /* exit if either we can't write or there isn't a defined timeout */
229 if (!mbx->ops.write || !mbx->timeout)
230 goto out;
231
232 /* send msg */
233 ret_val = mbx->ops.write(hw, msg, size, mbx_id);
234
235 /* if msg sent wait until we receive an ack */
236 if (!ret_val)
237 ret_val = igb_poll_for_ack(hw, mbx_id);
238out:
239 return ret_val;
240}
241
242static s32 igb_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
243{
244 u32 mbvficr = rd32(E1000_MBVFICR);
245 s32 ret_val = -E1000_ERR_MBX;
246
247 if (mbvficr & mask) {
248 ret_val = 0;
249 wr32(E1000_MBVFICR, mask);
250 }
251
252 return ret_val;
253}
254
255/**
256 * igb_check_for_msg_pf - checks to see if the VF has sent mail
257 * @hw: pointer to the HW structure
258 * @vf_number: the VF index
259 *
260 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
261 **/
262static s32 igb_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
263{
264 s32 ret_val = -E1000_ERR_MBX;
265
266 if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
267 ret_val = 0;
268 hw->mbx.stats.reqs++;
269 }
270
271 return ret_val;
272}
273
274/**
275 * igb_check_for_ack_pf - checks to see if the VF has ACKed
276 * @hw: pointer to the HW structure
277 * @vf_number: the VF index
278 *
279 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
280 **/
281static s32 igb_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
282{
283 s32 ret_val = -E1000_ERR_MBX;
284
285 if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
286 ret_val = 0;
287 hw->mbx.stats.acks++;
288 }
289
290 return ret_val;
291}
292
293/**
294 * igb_check_for_rst_pf - checks to see if the VF has reset
295 * @hw: pointer to the HW structure
296 * @vf_number: the VF index
297 *
298 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
299 **/
300static s32 igb_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
301{
302 u32 vflre = rd32(E1000_VFLRE);
303 s32 ret_val = -E1000_ERR_MBX;
304
305 if (vflre & BIT(vf_number)) {
306 ret_val = 0;
307 wr32(E1000_VFLRE, BIT(vf_number));
308 hw->mbx.stats.rsts++;
309 }
310
311 return ret_val;
312}
313
314/**
315 * igb_obtain_mbx_lock_pf - obtain mailbox lock
316 * @hw: pointer to the HW structure
317 * @vf_number: the VF index
318 *
319 * return SUCCESS if we obtained the mailbox lock
320 **/
321static s32 igb_obtain_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
322{
323 s32 ret_val = -E1000_ERR_MBX;
324 u32 p2v_mailbox;
325 int count = 10;
326
327 do {
328 /* Take ownership of the buffer */
329 wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
330
331 /* reserve mailbox for vf use */
332 p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
333 if (p2v_mailbox & E1000_P2VMAILBOX_PFU) {
334 ret_val = 0;
335 break;
336 }
337 udelay(1000);
338 } while (count-- > 0);
339
340 return ret_val;
341}
342
343/**
344 * igb_release_mbx_lock_pf - release mailbox lock
345 * @hw: pointer to the HW structure
346 * @vf_number: the VF index
347 *
348 * return SUCCESS if we released the mailbox lock
349 **/
350static s32 igb_release_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
351{
352 u32 p2v_mailbox;
353
354 /* drop PF lock of mailbox, if set */
355 p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
356 if (p2v_mailbox & E1000_P2VMAILBOX_PFU)
357 wr32(E1000_P2VMAILBOX(vf_number),
358 p2v_mailbox & ~E1000_P2VMAILBOX_PFU);
359
360 return 0;
361}
362
363/**
364 * igb_write_mbx_pf - Places a message in the mailbox
365 * @hw: pointer to the HW structure
366 * @msg: The message buffer
367 * @size: Length of buffer
368 * @vf_number: the VF index
369 *
370 * returns SUCCESS if it successfully copied message into the buffer
371 **/
372static s32 igb_write_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
373 u16 vf_number)
374{
375 s32 ret_val;
376 u16 i;
377
378 /* lock the mailbox to prevent pf/vf race condition */
379 ret_val = igb_obtain_mbx_lock_pf(hw, vf_number);
380 if (ret_val)
381 goto out_no_write;
382
383 /* flush msg and acks as we are overwriting the message buffer */
384 igb_check_for_msg_pf(hw, vf_number);
385 igb_check_for_ack_pf(hw, vf_number);
386
387 /* copy the caller specified message to the mailbox memory buffer */
388 for (i = 0; i < size; i++)
389 array_wr32(E1000_VMBMEM(vf_number), i, msg[i]);
390
391 /* Interrupt VF to tell it a message has been sent and release buffer*/
392 wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS);
393
394 /* update stats */
395 hw->mbx.stats.msgs_tx++;
396
397out_no_write:
398 return ret_val;
399
400}
401
402/**
403 * igb_read_mbx_pf - Read a message from the mailbox
404 * @hw: pointer to the HW structure
405 * @msg: The message buffer
406 * @size: Length of buffer
407 * @vf_number: the VF index
408 * @unlock: unlock the mailbox when done?
409 *
410 * This function copies a message from the mailbox buffer to the caller's
411 * memory buffer. The presumption is that the caller knows that there was
412 * a message due to a VF request so no polling for message is needed.
413 **/
414static s32 igb_read_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
415 u16 vf_number, bool unlock)
416{
417 s32 ret_val;
418 u16 i;
419
420 /* lock the mailbox to prevent pf/vf race condition */
421 ret_val = igb_obtain_mbx_lock_pf(hw, vf_number);
422 if (ret_val)
423 goto out_no_read;
424
425 /* copy the message to the mailbox memory buffer */
426 for (i = 0; i < size; i++)
427 msg[i] = array_rd32(E1000_VMBMEM(vf_number), i);
428
429 /* Acknowledge the message and release mailbox lock (or not) */
430 if (unlock)
431 wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_ACK);
432 else
433 wr32(E1000_P2VMAILBOX(vf_number),
434 E1000_P2VMAILBOX_ACK | E1000_P2VMAILBOX_PFU);
435
436 /* update stats */
437 hw->mbx.stats.msgs_rx++;
438
439out_no_read:
440 return ret_val;
441}
442
443/**
444 * igb_init_mbx_params_pf - set initial values for pf mailbox
445 * @hw: pointer to the HW structure
446 *
447 * Initializes the hw->mbx struct to correct values for pf mailbox
448 */
449s32 igb_init_mbx_params_pf(struct e1000_hw *hw)
450{
451 struct e1000_mbx_info *mbx = &hw->mbx;
452
453 mbx->timeout = 0;
454 mbx->usec_delay = 0;
455
456 mbx->size = E1000_VFMAILBOX_SIZE;
457
458 mbx->ops.read = igb_read_mbx_pf;
459 mbx->ops.write = igb_write_mbx_pf;
460 mbx->ops.read_posted = igb_read_posted_mbx;
461 mbx->ops.write_posted = igb_write_posted_mbx;
462 mbx->ops.check_for_msg = igb_check_for_msg_pf;
463 mbx->ops.check_for_ack = igb_check_for_ack_pf;
464 mbx->ops.check_for_rst = igb_check_for_rst_pf;
465 mbx->ops.unlock = igb_release_mbx_lock_pf;
466
467 mbx->stats.msgs_tx = 0;
468 mbx->stats.msgs_rx = 0;
469 mbx->stats.reqs = 0;
470 mbx->stats.acks = 0;
471 mbx->stats.rsts = 0;
472
473 return 0;
474}
475
1/*******************************************************************************
2
3 Intel(R) Gigabit Ethernet Linux driver
4 Copyright(c) 2007-2014 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, see <http://www.gnu.org/licenses/>.
17
18 The full GNU General Public License is included in this distribution in
19 the file called "COPYING".
20
21 Contact Information:
22 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
23 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24
25*******************************************************************************/
26
27#include "e1000_mbx.h"
28
29/**
30 * igb_read_mbx - Reads a message from the mailbox
31 * @hw: pointer to the HW structure
32 * @msg: The message buffer
33 * @size: Length of buffer
34 * @mbx_id: id of mailbox to read
35 *
36 * returns SUCCESS if it successfully read message from buffer
37 **/
38s32 igb_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
39{
40 struct e1000_mbx_info *mbx = &hw->mbx;
41 s32 ret_val = -E1000_ERR_MBX;
42
43 /* limit read to size of mailbox */
44 if (size > mbx->size)
45 size = mbx->size;
46
47 if (mbx->ops.read)
48 ret_val = mbx->ops.read(hw, msg, size, mbx_id);
49
50 return ret_val;
51}
52
53/**
54 * igb_write_mbx - Write a message to the mailbox
55 * @hw: pointer to the HW structure
56 * @msg: The message buffer
57 * @size: Length of buffer
58 * @mbx_id: id of mailbox to write
59 *
60 * returns SUCCESS if it successfully copied message into the buffer
61 **/
62s32 igb_write_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
63{
64 struct e1000_mbx_info *mbx = &hw->mbx;
65 s32 ret_val = 0;
66
67 if (size > mbx->size)
68 ret_val = -E1000_ERR_MBX;
69
70 else if (mbx->ops.write)
71 ret_val = mbx->ops.write(hw, msg, size, mbx_id);
72
73 return ret_val;
74}
75
76/**
77 * igb_check_for_msg - checks to see if someone sent us mail
78 * @hw: pointer to the HW structure
79 * @mbx_id: id of mailbox to check
80 *
81 * returns SUCCESS if the Status bit was found or else ERR_MBX
82 **/
83s32 igb_check_for_msg(struct e1000_hw *hw, u16 mbx_id)
84{
85 struct e1000_mbx_info *mbx = &hw->mbx;
86 s32 ret_val = -E1000_ERR_MBX;
87
88 if (mbx->ops.check_for_msg)
89 ret_val = mbx->ops.check_for_msg(hw, mbx_id);
90
91 return ret_val;
92}
93
94/**
95 * igb_check_for_ack - checks to see if someone sent us ACK
96 * @hw: pointer to the HW structure
97 * @mbx_id: id of mailbox to check
98 *
99 * returns SUCCESS if the Status bit was found or else ERR_MBX
100 **/
101s32 igb_check_for_ack(struct e1000_hw *hw, u16 mbx_id)
102{
103 struct e1000_mbx_info *mbx = &hw->mbx;
104 s32 ret_val = -E1000_ERR_MBX;
105
106 if (mbx->ops.check_for_ack)
107 ret_val = mbx->ops.check_for_ack(hw, mbx_id);
108
109 return ret_val;
110}
111
112/**
113 * igb_check_for_rst - checks to see if other side has reset
114 * @hw: pointer to the HW structure
115 * @mbx_id: id of mailbox to check
116 *
117 * returns SUCCESS if the Status bit was found or else ERR_MBX
118 **/
119s32 igb_check_for_rst(struct e1000_hw *hw, u16 mbx_id)
120{
121 struct e1000_mbx_info *mbx = &hw->mbx;
122 s32 ret_val = -E1000_ERR_MBX;
123
124 if (mbx->ops.check_for_rst)
125 ret_val = mbx->ops.check_for_rst(hw, mbx_id);
126
127 return ret_val;
128}
129
130/**
131 * igb_poll_for_msg - Wait for message notification
132 * @hw: pointer to the HW structure
133 * @mbx_id: id of mailbox to write
134 *
135 * returns SUCCESS if it successfully received a message notification
136 **/
137static s32 igb_poll_for_msg(struct e1000_hw *hw, u16 mbx_id)
138{
139 struct e1000_mbx_info *mbx = &hw->mbx;
140 int countdown = mbx->timeout;
141
142 if (!countdown || !mbx->ops.check_for_msg)
143 goto out;
144
145 while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
146 countdown--;
147 if (!countdown)
148 break;
149 udelay(mbx->usec_delay);
150 }
151
152 /* if we failed, all future posted messages fail until reset */
153 if (!countdown)
154 mbx->timeout = 0;
155out:
156 return countdown ? 0 : -E1000_ERR_MBX;
157}
158
159/**
160 * igb_poll_for_ack - Wait for message acknowledgement
161 * @hw: pointer to the HW structure
162 * @mbx_id: id of mailbox to write
163 *
164 * returns SUCCESS if it successfully received a message acknowledgement
165 **/
166static s32 igb_poll_for_ack(struct e1000_hw *hw, u16 mbx_id)
167{
168 struct e1000_mbx_info *mbx = &hw->mbx;
169 int countdown = mbx->timeout;
170
171 if (!countdown || !mbx->ops.check_for_ack)
172 goto out;
173
174 while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
175 countdown--;
176 if (!countdown)
177 break;
178 udelay(mbx->usec_delay);
179 }
180
181 /* if we failed, all future posted messages fail until reset */
182 if (!countdown)
183 mbx->timeout = 0;
184out:
185 return countdown ? 0 : -E1000_ERR_MBX;
186}
187
188/**
189 * igb_read_posted_mbx - Wait for message notification and receive message
190 * @hw: pointer to the HW structure
191 * @msg: The message buffer
192 * @size: Length of buffer
193 * @mbx_id: id of mailbox to write
194 *
195 * returns SUCCESS if it successfully received a message notification and
196 * copied it into the receive buffer.
197 **/
198static s32 igb_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size,
199 u16 mbx_id)
200{
201 struct e1000_mbx_info *mbx = &hw->mbx;
202 s32 ret_val = -E1000_ERR_MBX;
203
204 if (!mbx->ops.read)
205 goto out;
206
207 ret_val = igb_poll_for_msg(hw, mbx_id);
208
209 if (!ret_val)
210 ret_val = mbx->ops.read(hw, msg, size, mbx_id);
211out:
212 return ret_val;
213}
214
215/**
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
221 *
222 * returns SUCCESS if it successfully copied message into the buffer and
223 * received an ack to that message within delay * timeout period
224 **/
225static s32 igb_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size,
226 u16 mbx_id)
227{
228 struct e1000_mbx_info *mbx = &hw->mbx;
229 s32 ret_val = -E1000_ERR_MBX;
230
231 /* exit if either we can't write or there isn't a defined timeout */
232 if (!mbx->ops.write || !mbx->timeout)
233 goto out;
234
235 /* send msg */
236 ret_val = mbx->ops.write(hw, msg, size, mbx_id);
237
238 /* if msg sent wait until we receive an ack */
239 if (!ret_val)
240 ret_val = igb_poll_for_ack(hw, mbx_id);
241out:
242 return ret_val;
243}
244
245static s32 igb_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
246{
247 u32 mbvficr = rd32(E1000_MBVFICR);
248 s32 ret_val = -E1000_ERR_MBX;
249
250 if (mbvficr & mask) {
251 ret_val = 0;
252 wr32(E1000_MBVFICR, mask);
253 }
254
255 return ret_val;
256}
257
258/**
259 * igb_check_for_msg_pf - checks to see if the VF has sent mail
260 * @hw: pointer to the HW structure
261 * @vf_number: the VF index
262 *
263 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
264 **/
265static s32 igb_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
266{
267 s32 ret_val = -E1000_ERR_MBX;
268
269 if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
270 ret_val = 0;
271 hw->mbx.stats.reqs++;
272 }
273
274 return ret_val;
275}
276
277/**
278 * igb_check_for_ack_pf - checks to see if the VF has ACKed
279 * @hw: pointer to the HW structure
280 * @vf_number: the VF index
281 *
282 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
283 **/
284static s32 igb_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
285{
286 s32 ret_val = -E1000_ERR_MBX;
287
288 if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
289 ret_val = 0;
290 hw->mbx.stats.acks++;
291 }
292
293 return ret_val;
294}
295
296/**
297 * igb_check_for_rst_pf - checks to see if the VF has reset
298 * @hw: pointer to the HW structure
299 * @vf_number: the VF index
300 *
301 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
302 **/
303static s32 igb_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
304{
305 u32 vflre = rd32(E1000_VFLRE);
306 s32 ret_val = -E1000_ERR_MBX;
307
308 if (vflre & (1 << vf_number)) {
309 ret_val = 0;
310 wr32(E1000_VFLRE, (1 << vf_number));
311 hw->mbx.stats.rsts++;
312 }
313
314 return ret_val;
315}
316
317/**
318 * igb_obtain_mbx_lock_pf - obtain mailbox lock
319 * @hw: pointer to the HW structure
320 * @vf_number: the VF index
321 *
322 * return SUCCESS if we obtained the mailbox lock
323 **/
324static s32 igb_obtain_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
325{
326 s32 ret_val = -E1000_ERR_MBX;
327 u32 p2v_mailbox;
328
329 /* Take ownership of the buffer */
330 wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
331
332 /* reserve mailbox for vf use */
333 p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
334 if (p2v_mailbox & E1000_P2VMAILBOX_PFU)
335 ret_val = 0;
336
337 return ret_val;
338}
339
340/**
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
346 *
347 * returns SUCCESS if it successfully copied message into the buffer
348 **/
349static s32 igb_write_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
350 u16 vf_number)
351{
352 s32 ret_val;
353 u16 i;
354
355 /* lock the mailbox to prevent pf/vf race condition */
356 ret_val = igb_obtain_mbx_lock_pf(hw, vf_number);
357 if (ret_val)
358 goto out_no_write;
359
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);
363
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]);
367
368 /* Interrupt VF to tell it a message has been sent and release buffer*/
369 wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS);
370
371 /* update stats */
372 hw->mbx.stats.msgs_tx++;
373
374out_no_write:
375 return ret_val;
376
377}
378
379/**
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
385 *
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.
389 **/
390static s32 igb_read_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
391 u16 vf_number)
392{
393 s32 ret_val;
394 u16 i;
395
396 /* lock the mailbox to prevent pf/vf race condition */
397 ret_val = igb_obtain_mbx_lock_pf(hw, vf_number);
398 if (ret_val)
399 goto out_no_read;
400
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);
404
405 /* Acknowledge the message and release buffer */
406 wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_ACK);
407
408 /* update stats */
409 hw->mbx.stats.msgs_rx++;
410
411out_no_read:
412 return ret_val;
413}
414
415/**
416 * e1000_init_mbx_params_pf - set initial values for pf mailbox
417 * @hw: pointer to the HW structure
418 *
419 * Initializes the hw->mbx struct to correct values for pf mailbox
420 */
421s32 igb_init_mbx_params_pf(struct e1000_hw *hw)
422{
423 struct e1000_mbx_info *mbx = &hw->mbx;
424
425 mbx->timeout = 0;
426 mbx->usec_delay = 0;
427
428 mbx->size = E1000_VFMAILBOX_SIZE;
429
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;
437
438 mbx->stats.msgs_tx = 0;
439 mbx->stats.msgs_rx = 0;
440 mbx->stats.reqs = 0;
441 mbx->stats.acks = 0;
442 mbx->stats.rsts = 0;
443
444 return 0;
445}
446