1 /*******************************************************************************
3 Intel(R) Gigabit Ethernet Linux driver
4 Copyright(c) 2007-2009 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 successfuly 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 (!mbx->ops.check_for_msg)
146 while (mbx->ops.check_for_msg(hw, mbx_id)) {
150 udelay(mbx->usec_delay);
153 return countdown ? 0 : -E1000_ERR_MBX;
157 * igb_poll_for_ack - Wait for message acknowledgement
158 * @hw: pointer to the HW structure
159 * @mbx_id: id of mailbox to write
161 * returns SUCCESS if it successfully received a message acknowledgement
163 static s32 igb_poll_for_ack(struct e1000_hw *hw, u16 mbx_id)
165 struct e1000_mbx_info *mbx = &hw->mbx;
166 int countdown = mbx->timeout;
168 if (!mbx->ops.check_for_ack)
171 while (mbx->ops.check_for_ack(hw, mbx_id)) {
175 udelay(mbx->usec_delay);
178 return countdown ? 0 : -E1000_ERR_MBX;
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
188 * returns SUCCESS if it successfully received a message notification and
189 * copied it into the receive buffer.
191 static s32 igb_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
193 struct e1000_mbx_info *mbx = &hw->mbx;
194 s32 ret_val = -E1000_ERR_MBX;
199 ret_val = igb_poll_for_msg(hw, mbx_id);
202 ret_val = mbx->ops.read(hw, msg, size, mbx_id);
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
214 * returns SUCCESS if it successfully copied message into the buffer and
215 * received an ack to that message within delay * timeout period
217 static s32 igb_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
219 struct e1000_mbx_info *mbx = &hw->mbx;
226 ret_val = mbx->ops.write(hw, msg, size, mbx_id);
228 /* if msg sent wait until we receive an ack */
230 ret_val = igb_poll_for_ack(hw, mbx_id);
235 static s32 igb_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
237 u32 mbvficr = rd32(E1000_MBVFICR);
238 s32 ret_val = -E1000_ERR_MBX;
240 if (mbvficr & mask) {
242 wr32(E1000_MBVFICR, mask);
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
253 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
255 static s32 igb_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
257 s32 ret_val = -E1000_ERR_MBX;
259 if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
261 hw->mbx.stats.reqs++;
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
272 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
274 static s32 igb_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
276 s32 ret_val = -E1000_ERR_MBX;
278 if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
280 hw->mbx.stats.acks++;
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
291 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
293 static s32 igb_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
295 u32 vflre = rd32(E1000_VFLRE);
296 s32 ret_val = -E1000_ERR_MBX;
298 if (vflre & (1 << vf_number)) {
300 wr32(E1000_VFLRE, (1 << vf_number));
301 hw->mbx.stats.rsts++;
308 * igb_write_mbx_pf - Places a message in the mailbox
309 * @hw: pointer to the HW structure
310 * @msg: The message buffer
311 * @size: Length of buffer
312 * @vf_number: the VF index
314 * returns SUCCESS if it successfully copied message into the buffer
316 static s32 igb_write_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
323 /* Take ownership of the buffer */
324 wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
326 /* Make sure we have ownership now... */
327 p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
328 if (!(p2v_mailbox & E1000_P2VMAILBOX_PFU)) {
329 /* failed to grab ownership */
330 ret_val = -E1000_ERR_MBX;
335 * flush any ack or msg which may already be in the queue
336 * as they are likely the result of an error
338 igb_check_for_ack_pf(hw, vf_number);
339 igb_check_for_msg_pf(hw, vf_number);
341 /* copy the caller specified message to the mailbox memory buffer */
342 for (i = 0; i < size; i++)
343 array_wr32(E1000_VMBMEM(vf_number), i, msg[i]);
345 /* Interrupt VF to tell it a message has been sent and release buffer*/
346 wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS);
349 hw->mbx.stats.msgs_tx++;
357 * igb_read_mbx_pf - Read a message from the mailbox
358 * @hw: pointer to the HW structure
359 * @msg: The message buffer
360 * @size: Length of buffer
361 * @vf_number: the VF index
363 * This function copies a message from the mailbox buffer to the caller's
364 * memory buffer. The presumption is that the caller knows that there was
365 * a message due to a VF request so no polling for message is needed.
367 static s32 igb_read_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
374 /* Take ownership of the buffer */
375 wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
377 /* Make sure we have ownership now... */
378 p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
379 if (!(p2v_mailbox & E1000_P2VMAILBOX_PFU)) {
380 /* failed to grab ownership */
381 ret_val = -E1000_ERR_MBX;
385 /* copy the message to the mailbox memory buffer */
386 for (i = 0; i < size; i++)
387 msg[i] = array_rd32(E1000_VMBMEM(vf_number), i);
389 /* Acknowledge the message and release buffer */
390 wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_ACK);
393 hw->mbx.stats.msgs_rx++;
402 * e1000_init_mbx_params_pf - set initial values for pf mailbox
403 * @hw: pointer to the HW structure
405 * Initializes the hw->mbx struct to correct values for pf mailbox
407 s32 igb_init_mbx_params_pf(struct e1000_hw *hw)
409 struct e1000_mbx_info *mbx = &hw->mbx;
411 if (hw->mac.type == e1000_82576) {
415 mbx->size = E1000_VFMAILBOX_SIZE;
417 mbx->ops.read = igb_read_mbx_pf;
418 mbx->ops.write = igb_write_mbx_pf;
419 mbx->ops.read_posted = igb_read_posted_mbx;
420 mbx->ops.write_posted = igb_write_posted_mbx;
421 mbx->ops.check_for_msg = igb_check_for_msg_pf;
422 mbx->ops.check_for_ack = igb_check_for_ack_pf;
423 mbx->ops.check_for_rst = igb_check_for_rst_pf;
425 mbx->stats.msgs_tx = 0;
426 mbx->stats.msgs_rx = 0;