1 /*******************************************************************************
3 Intel(R) Gigabit Ethernet Linux driver
4 Copyright(c) 2007-2014 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, see <http://www.gnu.org/licenses/>.
18 The full GNU General Public License is included in this distribution in
19 the file called "COPYING".
23 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *******************************************************************************/
27 #include "e1000_mbx.h"
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
36 * returns SUCCESS if it successfully read message from buffer
38 s32 igb_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
40 struct e1000_mbx_info *mbx = &hw->mbx;
41 s32 ret_val = -E1000_ERR_MBX;
43 /* limit read to size of mailbox */
48 ret_val = mbx->ops.read(hw, msg, size, mbx_id);
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
60 * returns SUCCESS if it successfully copied message into the buffer
62 s32 igb_write_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
64 struct e1000_mbx_info *mbx = &hw->mbx;
68 ret_val = -E1000_ERR_MBX;
70 else if (mbx->ops.write)
71 ret_val = mbx->ops.write(hw, msg, size, mbx_id);
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
81 * returns SUCCESS if the Status bit was found or else ERR_MBX
83 s32 igb_check_for_msg(struct e1000_hw *hw, u16 mbx_id)
85 struct e1000_mbx_info *mbx = &hw->mbx;
86 s32 ret_val = -E1000_ERR_MBX;
88 if (mbx->ops.check_for_msg)
89 ret_val = mbx->ops.check_for_msg(hw, mbx_id);
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
99 * returns SUCCESS if the Status bit was found or else ERR_MBX
101 s32 igb_check_for_ack(struct e1000_hw *hw, u16 mbx_id)
103 struct e1000_mbx_info *mbx = &hw->mbx;
104 s32 ret_val = -E1000_ERR_MBX;
106 if (mbx->ops.check_for_ack)
107 ret_val = mbx->ops.check_for_ack(hw, mbx_id);
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
117 * returns SUCCESS if the Status bit was found or else ERR_MBX
119 s32 igb_check_for_rst(struct e1000_hw *hw, u16 mbx_id)
121 struct e1000_mbx_info *mbx = &hw->mbx;
122 s32 ret_val = -E1000_ERR_MBX;
124 if (mbx->ops.check_for_rst)
125 ret_val = mbx->ops.check_for_rst(hw, mbx_id);
131 * igb_poll_for_msg - Wait for message notification
132 * @hw: pointer to the HW structure
133 * @mbx_id: id of mailbox to write
135 * returns SUCCESS if it successfully received a message notification
137 static s32 igb_poll_for_msg(struct e1000_hw *hw, u16 mbx_id)
139 struct e1000_mbx_info *mbx = &hw->mbx;
140 int countdown = mbx->timeout;
142 if (!countdown || !mbx->ops.check_for_msg)
145 while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
149 udelay(mbx->usec_delay);
152 /* if we failed, all future posted messages fail until reset */
156 return countdown ? 0 : -E1000_ERR_MBX;
160 * igb_poll_for_ack - Wait for message acknowledgement
161 * @hw: pointer to the HW structure
162 * @mbx_id: id of mailbox to write
164 * returns SUCCESS if it successfully received a message acknowledgement
166 static s32 igb_poll_for_ack(struct e1000_hw *hw, u16 mbx_id)
168 struct e1000_mbx_info *mbx = &hw->mbx;
169 int countdown = mbx->timeout;
171 if (!countdown || !mbx->ops.check_for_ack)
174 while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
178 udelay(mbx->usec_delay);
181 /* if we failed, all future posted messages fail until reset */
185 return countdown ? 0 : -E1000_ERR_MBX;
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
195 * returns SUCCESS if it successfully received a message notification and
196 * copied it into the receive buffer.
198 static s32 igb_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size,
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,
228 struct e1000_mbx_info *mbx = &hw->mbx;
229 s32 ret_val = -E1000_ERR_MBX;
231 /* exit if either we can't write or there isn't a defined timeout */
232 if (!mbx->ops.write || !mbx->timeout)
236 ret_val = mbx->ops.write(hw, msg, size, mbx_id);
238 /* if msg sent wait until we receive an ack */
240 ret_val = igb_poll_for_ack(hw, mbx_id);
245 static s32 igb_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
247 u32 mbvficr = rd32(E1000_MBVFICR);
248 s32 ret_val = -E1000_ERR_MBX;
250 if (mbvficr & mask) {
252 wr32(E1000_MBVFICR, mask);
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
263 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
265 static s32 igb_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
267 s32 ret_val = -E1000_ERR_MBX;
269 if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
271 hw->mbx.stats.reqs++;
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
282 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
284 static s32 igb_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
286 s32 ret_val = -E1000_ERR_MBX;
288 if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
290 hw->mbx.stats.acks++;
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
301 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
303 static s32 igb_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
305 u32 vflre = rd32(E1000_VFLRE);
306 s32 ret_val = -E1000_ERR_MBX;
308 if (vflre & (1 << vf_number)) {
310 wr32(E1000_VFLRE, (1 << vf_number));
311 hw->mbx.stats.rsts++;
318 * igb_obtain_mbx_lock_pf - obtain mailbox lock
319 * @hw: pointer to the HW structure
320 * @vf_number: the VF index
322 * return SUCCESS if we obtained the mailbox lock
324 static s32 igb_obtain_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
326 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;