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1 | /******************************************************************************* |
2 | ||
3 | Intel 82599 Virtual Function driver | |
4 | Copyright(c) 1999 - 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 "mbx.h" | |
29 | ||
30 | /** | |
31 | * ixgbevf_poll_for_msg - Wait for message notification | |
32 | * @hw: pointer to the HW structure | |
33 | * | |
34 | * returns 0 if it successfully received a message notification | |
35 | **/ | |
36 | static s32 ixgbevf_poll_for_msg(struct ixgbe_hw *hw) | |
37 | { | |
38 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
39 | int countdown = mbx->timeout; | |
40 | ||
41 | while (countdown && mbx->ops.check_for_msg(hw)) { | |
42 | countdown--; | |
43 | udelay(mbx->udelay); | |
44 | } | |
45 | ||
46 | /* if we failed, all future posted messages fail until reset */ | |
47 | if (!countdown) | |
48 | mbx->timeout = 0; | |
49 | ||
50 | return countdown ? 0 : IXGBE_ERR_MBX; | |
51 | } | |
52 | ||
53 | /** | |
54 | * ixgbevf_poll_for_ack - Wait for message acknowledgement | |
55 | * @hw: pointer to the HW structure | |
56 | * | |
57 | * returns 0 if it successfully received a message acknowledgement | |
58 | **/ | |
59 | static s32 ixgbevf_poll_for_ack(struct ixgbe_hw *hw) | |
60 | { | |
61 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
62 | int countdown = mbx->timeout; | |
63 | ||
64 | while (countdown && mbx->ops.check_for_ack(hw)) { | |
65 | countdown--; | |
66 | udelay(mbx->udelay); | |
67 | } | |
68 | ||
69 | /* if we failed, all future posted messages fail until reset */ | |
70 | if (!countdown) | |
71 | mbx->timeout = 0; | |
72 | ||
73 | return countdown ? 0 : IXGBE_ERR_MBX; | |
74 | } | |
75 | ||
76 | /** | |
77 | * ixgbevf_read_posted_mbx - Wait for message notification and receive message | |
78 | * @hw: pointer to the HW structure | |
79 | * @msg: The message buffer | |
80 | * @size: Length of buffer | |
81 | * | |
82 | * returns 0 if it successfully received a message notification and | |
83 | * copied it into the receive buffer. | |
84 | **/ | |
85 | static s32 ixgbevf_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size) | |
86 | { | |
87 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
88 | s32 ret_val = IXGBE_ERR_MBX; | |
89 | ||
90 | ret_val = ixgbevf_poll_for_msg(hw); | |
91 | ||
92 | /* if ack received read message, otherwise we timed out */ | |
93 | if (!ret_val) | |
94 | ret_val = mbx->ops.read(hw, msg, size); | |
95 | ||
96 | return ret_val; | |
97 | } | |
98 | ||
99 | /** | |
100 | * ixgbevf_write_posted_mbx - Write a message to the mailbox, wait for ack | |
101 | * @hw: pointer to the HW structure | |
102 | * @msg: The message buffer | |
103 | * @size: Length of buffer | |
104 | * | |
105 | * returns 0 if it successfully copied message into the buffer and | |
106 | * received an ack to that message within delay * timeout period | |
107 | **/ | |
108 | static s32 ixgbevf_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size) | |
109 | { | |
110 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
111 | s32 ret_val; | |
112 | ||
113 | /* send msg */ | |
114 | ret_val = mbx->ops.write(hw, msg, size); | |
115 | ||
116 | /* if msg sent wait until we receive an ack */ | |
117 | if (!ret_val) | |
118 | ret_val = ixgbevf_poll_for_ack(hw); | |
119 | ||
120 | return ret_val; | |
121 | } | |
122 | ||
123 | /** | |
124 | * ixgbevf_read_v2p_mailbox - read v2p mailbox | |
125 | * @hw: pointer to the HW structure | |
126 | * | |
127 | * This function is used to read the v2p mailbox without losing the read to | |
128 | * clear status bits. | |
129 | **/ | |
130 | static u32 ixgbevf_read_v2p_mailbox(struct ixgbe_hw *hw) | |
131 | { | |
132 | u32 v2p_mailbox = IXGBE_READ_REG(hw, IXGBE_VFMAILBOX); | |
133 | ||
134 | v2p_mailbox |= hw->mbx.v2p_mailbox; | |
135 | hw->mbx.v2p_mailbox |= v2p_mailbox & IXGBE_VFMAILBOX_R2C_BITS; | |
136 | ||
137 | return v2p_mailbox; | |
138 | } | |
139 | ||
140 | /** | |
141 | * ixgbevf_check_for_bit_vf - Determine if a status bit was set | |
142 | * @hw: pointer to the HW structure | |
143 | * @mask: bitmask for bits to be tested and cleared | |
144 | * | |
145 | * This function is used to check for the read to clear bits within | |
146 | * the V2P mailbox. | |
147 | **/ | |
148 | static s32 ixgbevf_check_for_bit_vf(struct ixgbe_hw *hw, u32 mask) | |
149 | { | |
150 | u32 v2p_mailbox = ixgbevf_read_v2p_mailbox(hw); | |
151 | s32 ret_val = IXGBE_ERR_MBX; | |
152 | ||
153 | if (v2p_mailbox & mask) | |
154 | ret_val = 0; | |
155 | ||
156 | hw->mbx.v2p_mailbox &= ~mask; | |
157 | ||
158 | return ret_val; | |
159 | } | |
160 | ||
161 | /** | |
162 | * ixgbevf_check_for_msg_vf - checks to see if the PF has sent mail | |
163 | * @hw: pointer to the HW structure | |
164 | * | |
165 | * returns 0 if the PF has set the Status bit or else ERR_MBX | |
166 | **/ | |
167 | static s32 ixgbevf_check_for_msg_vf(struct ixgbe_hw *hw) | |
168 | { | |
169 | s32 ret_val = IXGBE_ERR_MBX; | |
170 | ||
171 | if (!ixgbevf_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFSTS)) { | |
172 | ret_val = 0; | |
173 | hw->mbx.stats.reqs++; | |
174 | } | |
175 | ||
176 | return ret_val; | |
177 | } | |
178 | ||
179 | /** | |
180 | * ixgbevf_check_for_ack_vf - checks to see if the PF has ACK'd | |
181 | * @hw: pointer to the HW structure | |
182 | * | |
183 | * returns 0 if the PF has set the ACK bit or else ERR_MBX | |
184 | **/ | |
185 | static s32 ixgbevf_check_for_ack_vf(struct ixgbe_hw *hw) | |
186 | { | |
187 | s32 ret_val = IXGBE_ERR_MBX; | |
188 | ||
189 | if (!ixgbevf_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFACK)) { | |
190 | ret_val = 0; | |
191 | hw->mbx.stats.acks++; | |
192 | } | |
193 | ||
194 | return ret_val; | |
195 | } | |
196 | ||
197 | /** | |
198 | * ixgbevf_check_for_rst_vf - checks to see if the PF has reset | |
199 | * @hw: pointer to the HW structure | |
200 | * | |
201 | * returns true if the PF has set the reset done bit or else false | |
202 | **/ | |
203 | static s32 ixgbevf_check_for_rst_vf(struct ixgbe_hw *hw) | |
204 | { | |
205 | s32 ret_val = IXGBE_ERR_MBX; | |
206 | ||
207 | if (!ixgbevf_check_for_bit_vf(hw, (IXGBE_VFMAILBOX_RSTD | | |
208 | IXGBE_VFMAILBOX_RSTI))) { | |
209 | ret_val = 0; | |
210 | hw->mbx.stats.rsts++; | |
211 | } | |
212 | ||
213 | return ret_val; | |
214 | } | |
215 | ||
216 | /** | |
217 | * ixgbevf_obtain_mbx_lock_vf - obtain mailbox lock | |
218 | * @hw: pointer to the HW structure | |
219 | * | |
220 | * return 0 if we obtained the mailbox lock | |
221 | **/ | |
222 | static s32 ixgbevf_obtain_mbx_lock_vf(struct ixgbe_hw *hw) | |
223 | { | |
224 | s32 ret_val = IXGBE_ERR_MBX; | |
225 | ||
226 | /* Take ownership of the buffer */ | |
227 | IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_VFU); | |
228 | ||
229 | /* reserve mailbox for vf use */ | |
230 | if (ixgbevf_read_v2p_mailbox(hw) & IXGBE_VFMAILBOX_VFU) | |
231 | ret_val = 0; | |
232 | ||
233 | return ret_val; | |
234 | } | |
235 | ||
236 | /** | |
237 | * ixgbevf_write_mbx_vf - Write a message to the mailbox | |
238 | * @hw: pointer to the HW structure | |
239 | * @msg: The message buffer | |
240 | * @size: Length of buffer | |
241 | * | |
242 | * returns 0 if it successfully copied message into the buffer | |
243 | **/ | |
244 | static s32 ixgbevf_write_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size) | |
245 | { | |
246 | s32 ret_val; | |
247 | u16 i; | |
248 | ||
249 | ||
250 | /* lock the mailbox to prevent pf/vf race condition */ | |
251 | ret_val = ixgbevf_obtain_mbx_lock_vf(hw); | |
252 | if (ret_val) | |
253 | goto out_no_write; | |
254 | ||
255 | /* flush msg and acks as we are overwriting the message buffer */ | |
256 | ixgbevf_check_for_msg_vf(hw); | |
257 | ixgbevf_check_for_ack_vf(hw); | |
258 | ||
259 | /* copy the caller specified message to the mailbox memory buffer */ | |
260 | for (i = 0; i < size; i++) | |
261 | IXGBE_WRITE_REG_ARRAY(hw, IXGBE_VFMBMEM, i, msg[i]); | |
262 | ||
263 | /* update stats */ | |
264 | hw->mbx.stats.msgs_tx++; | |
265 | ||
266 | /* Drop VFU and interrupt the PF to tell it a message has been sent */ | |
267 | IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_REQ); | |
268 | ||
269 | out_no_write: | |
270 | return ret_val; | |
271 | } | |
272 | ||
273 | /** | |
274 | * ixgbevf_read_mbx_vf - Reads a message from the inbox intended for vf | |
275 | * @hw: pointer to the HW structure | |
276 | * @msg: The message buffer | |
277 | * @size: Length of buffer | |
278 | * | |
279 | * returns 0 if it successfuly read message from buffer | |
280 | **/ | |
281 | static s32 ixgbevf_read_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size) | |
282 | { | |
283 | s32 ret_val = 0; | |
284 | u16 i; | |
285 | ||
286 | /* lock the mailbox to prevent pf/vf race condition */ | |
287 | ret_val = ixgbevf_obtain_mbx_lock_vf(hw); | |
288 | if (ret_val) | |
289 | goto out_no_read; | |
290 | ||
291 | /* copy the message from the mailbox memory buffer */ | |
292 | for (i = 0; i < size; i++) | |
293 | msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_VFMBMEM, i); | |
294 | ||
295 | /* Acknowledge receipt and release mailbox, then we're done */ | |
296 | IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_ACK); | |
297 | ||
298 | /* update stats */ | |
299 | hw->mbx.stats.msgs_rx++; | |
300 | ||
301 | out_no_read: | |
302 | return ret_val; | |
303 | } | |
304 | ||
305 | /** | |
306 | * ixgbevf_init_mbx_params_vf - set initial values for vf mailbox | |
307 | * @hw: pointer to the HW structure | |
308 | * | |
309 | * Initializes the hw->mbx struct to correct values for vf mailbox | |
310 | */ | |
311 | s32 ixgbevf_init_mbx_params_vf(struct ixgbe_hw *hw) | |
312 | { | |
313 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
314 | ||
315 | /* start mailbox as timed out and let the reset_hw call set the timeout | |
316 | * value to begin communications */ | |
317 | mbx->timeout = 0; | |
318 | mbx->udelay = IXGBE_VF_MBX_INIT_DELAY; | |
319 | ||
320 | mbx->size = IXGBE_VFMAILBOX_SIZE; | |
321 | ||
322 | mbx->stats.msgs_tx = 0; | |
323 | mbx->stats.msgs_rx = 0; | |
324 | mbx->stats.reqs = 0; | |
325 | mbx->stats.acks = 0; | |
326 | mbx->stats.rsts = 0; | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | struct ixgbe_mbx_operations ixgbevf_mbx_ops = { | |
332 | .init_params = ixgbevf_init_mbx_params_vf, | |
333 | .read = ixgbevf_read_mbx_vf, | |
334 | .write = ixgbevf_write_mbx_vf, | |
335 | .read_posted = ixgbevf_read_posted_mbx, | |
336 | .write_posted = ixgbevf_write_posted_mbx, | |
337 | .check_for_msg = ixgbevf_check_for_msg_vf, | |
338 | .check_for_ack = ixgbevf_check_for_ack_vf, | |
339 | .check_for_rst = ixgbevf_check_for_rst_vf, | |
340 | }; | |
341 |