1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2018-2021 Beijing WangXun Technology Co., Ltd.
3 * Copyright(c) 2010-2017 Intel Corporation
4 */
5
6 #include "ngbe_type.h"
7
8 #include "ngbe_mbx.h"
9
10 /**
11 * ngbe_read_mbx - Reads a message from the mailbox
12 * @hw: pointer to the HW structure
13 * @msg: The message buffer
14 * @size: Length of buffer
15 * @mbx_id: id of mailbox to read
16 *
17 * returns 0 if it successfully read message from buffer
18 **/
ngbe_read_mbx(struct ngbe_hw * hw,u32 * msg,u16 size,u16 mbx_id)19 s32 ngbe_read_mbx(struct ngbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
20 {
21 struct ngbe_mbx_info *mbx = &hw->mbx;
22 s32 ret_val = NGBE_ERR_MBX;
23
24 /* limit read to size of mailbox */
25 if (size > mbx->size)
26 size = mbx->size;
27
28 if (mbx->read)
29 ret_val = mbx->read(hw, msg, size, mbx_id);
30
31 return ret_val;
32 }
33
34 /**
35 * ngbe_write_mbx - Write a message to the mailbox
36 * @hw: pointer to the HW structure
37 * @msg: The message buffer
38 * @size: Length of buffer
39 * @mbx_id: id of mailbox to write
40 *
41 * returns 0 if it successfully copied message into the buffer
42 **/
ngbe_write_mbx(struct ngbe_hw * hw,u32 * msg,u16 size,u16 mbx_id)43 s32 ngbe_write_mbx(struct ngbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
44 {
45 struct ngbe_mbx_info *mbx = &hw->mbx;
46 s32 ret_val = 0;
47
48 if (size > mbx->size) {
49 ret_val = NGBE_ERR_MBX;
50 DEBUGOUT("Invalid mailbox message size %d", size);
51 } else if (mbx->write) {
52 ret_val = mbx->write(hw, msg, size, mbx_id);
53 }
54
55 return ret_val;
56 }
57
58 /**
59 * ngbe_check_for_msg - checks to see if someone sent us mail
60 * @hw: pointer to the HW structure
61 * @mbx_id: id of mailbox to check
62 *
63 * returns 0 if the Status bit was found or else ERR_MBX
64 **/
ngbe_check_for_msg(struct ngbe_hw * hw,u16 mbx_id)65 s32 ngbe_check_for_msg(struct ngbe_hw *hw, u16 mbx_id)
66 {
67 struct ngbe_mbx_info *mbx = &hw->mbx;
68 s32 ret_val = NGBE_ERR_MBX;
69
70 if (mbx->check_for_msg)
71 ret_val = mbx->check_for_msg(hw, mbx_id);
72
73 return ret_val;
74 }
75
76 /**
77 * ngbe_check_for_ack - checks to see if someone sent us ACK
78 * @hw: pointer to the HW structure
79 * @mbx_id: id of mailbox to check
80 *
81 * returns 0 if the Status bit was found or else ERR_MBX
82 **/
ngbe_check_for_ack(struct ngbe_hw * hw,u16 mbx_id)83 s32 ngbe_check_for_ack(struct ngbe_hw *hw, u16 mbx_id)
84 {
85 struct ngbe_mbx_info *mbx = &hw->mbx;
86 s32 ret_val = NGBE_ERR_MBX;
87
88 if (mbx->check_for_ack)
89 ret_val = mbx->check_for_ack(hw, mbx_id);
90
91 return ret_val;
92 }
93
94 /**
95 * ngbe_check_for_rst - checks to see if other side has reset
96 * @hw: pointer to the HW structure
97 * @mbx_id: id of mailbox to check
98 *
99 * returns 0 if the Status bit was found or else ERR_MBX
100 **/
ngbe_check_for_rst(struct ngbe_hw * hw,u16 mbx_id)101 s32 ngbe_check_for_rst(struct ngbe_hw *hw, u16 mbx_id)
102 {
103 struct ngbe_mbx_info *mbx = &hw->mbx;
104 s32 ret_val = NGBE_ERR_MBX;
105
106 if (mbx->check_for_rst)
107 ret_val = mbx->check_for_rst(hw, mbx_id);
108
109 return ret_val;
110 }
111
ngbe_check_for_bit_pf(struct ngbe_hw * hw,u32 mask)112 STATIC s32 ngbe_check_for_bit_pf(struct ngbe_hw *hw, u32 mask)
113 {
114 u32 mbvficr = rd32(hw, NGBE_MBVFICR);
115 s32 ret_val = NGBE_ERR_MBX;
116
117 if (mbvficr & mask) {
118 ret_val = 0;
119 wr32(hw, NGBE_MBVFICR, mask);
120 }
121
122 return ret_val;
123 }
124
125 /**
126 * ngbe_check_for_msg_pf - checks to see if the VF has sent mail
127 * @hw: pointer to the HW structure
128 * @vf_number: the VF index
129 *
130 * returns 0 if the VF has set the Status bit or else ERR_MBX
131 **/
ngbe_check_for_msg_pf(struct ngbe_hw * hw,u16 vf_number)132 s32 ngbe_check_for_msg_pf(struct ngbe_hw *hw, u16 vf_number)
133 {
134 s32 ret_val = NGBE_ERR_MBX;
135 u32 vf_bit = vf_number;
136
137 if (!ngbe_check_for_bit_pf(hw, NGBE_MBVFICR_VFREQ_VF1 << vf_bit)) {
138 ret_val = 0;
139 hw->mbx.stats.reqs++;
140 }
141
142 return ret_val;
143 }
144
145 /**
146 * ngbe_check_for_ack_pf - checks to see if the VF has ACKed
147 * @hw: pointer to the HW structure
148 * @vf_number: the VF index
149 *
150 * returns 0 if the VF has set the Status bit or else ERR_MBX
151 **/
ngbe_check_for_ack_pf(struct ngbe_hw * hw,u16 vf_number)152 s32 ngbe_check_for_ack_pf(struct ngbe_hw *hw, u16 vf_number)
153 {
154 s32 ret_val = NGBE_ERR_MBX;
155 u32 vf_bit = vf_number;
156
157 if (!ngbe_check_for_bit_pf(hw, NGBE_MBVFICR_VFACK_VF1 << vf_bit)) {
158 ret_val = 0;
159 hw->mbx.stats.acks++;
160 }
161
162 return ret_val;
163 }
164
165 /**
166 * ngbe_check_for_rst_pf - checks to see if the VF has reset
167 * @hw: pointer to the HW structure
168 * @vf_number: the VF index
169 *
170 * returns 0 if the VF has set the Status bit or else ERR_MBX
171 **/
ngbe_check_for_rst_pf(struct ngbe_hw * hw,u16 vf_number)172 s32 ngbe_check_for_rst_pf(struct ngbe_hw *hw, u16 vf_number)
173 {
174 u32 vflre = 0;
175 s32 ret_val = NGBE_ERR_MBX;
176
177 vflre = rd32(hw, NGBE_FLRVFE);
178 if (vflre & (1 << vf_number)) {
179 ret_val = 0;
180 wr32(hw, NGBE_FLRVFEC, (1 << vf_number));
181 hw->mbx.stats.rsts++;
182 }
183
184 return ret_val;
185 }
186
187 /**
188 * ngbe_obtain_mbx_lock_pf - obtain mailbox lock
189 * @hw: pointer to the HW structure
190 * @vf_number: the VF index
191 *
192 * return 0 if we obtained the mailbox lock
193 **/
ngbe_obtain_mbx_lock_pf(struct ngbe_hw * hw,u16 vf_number)194 STATIC s32 ngbe_obtain_mbx_lock_pf(struct ngbe_hw *hw, u16 vf_number)
195 {
196 s32 ret_val = NGBE_ERR_MBX;
197 u32 p2v_mailbox;
198
199 /* Take ownership of the buffer */
200 wr32(hw, NGBE_MBCTL(vf_number), NGBE_MBCTL_PFU);
201
202 /* reserve mailbox for vf use */
203 p2v_mailbox = rd32(hw, NGBE_MBCTL(vf_number));
204 if (p2v_mailbox & NGBE_MBCTL_PFU)
205 ret_val = 0;
206 else
207 DEBUGOUT("Failed to obtain mailbox lock for VF%d", vf_number);
208
209
210 return ret_val;
211 }
212
213 /**
214 * ngbe_write_mbx_pf - Places a message in the mailbox
215 * @hw: pointer to the HW structure
216 * @msg: The message buffer
217 * @size: Length of buffer
218 * @vf_number: the VF index
219 *
220 * returns 0 if it successfully copied message into the buffer
221 **/
ngbe_write_mbx_pf(struct ngbe_hw * hw,u32 * msg,u16 size,u16 vf_number)222 s32 ngbe_write_mbx_pf(struct ngbe_hw *hw, u32 *msg, u16 size, u16 vf_number)
223 {
224 s32 ret_val;
225 u16 i;
226
227 /* lock the mailbox to prevent pf/vf race condition */
228 ret_val = ngbe_obtain_mbx_lock_pf(hw, vf_number);
229 if (ret_val)
230 goto out_no_write;
231
232 /* flush msg and acks as we are overwriting the message buffer */
233 ngbe_check_for_msg_pf(hw, vf_number);
234 ngbe_check_for_ack_pf(hw, vf_number);
235
236 /* copy the caller specified message to the mailbox memory buffer */
237 for (i = 0; i < size; i++)
238 wr32a(hw, NGBE_MBMEM(vf_number), i, msg[i]);
239
240 /* Interrupt VF to tell it a message has been sent and release buffer*/
241 wr32(hw, NGBE_MBCTL(vf_number), NGBE_MBCTL_STS);
242
243 /* update stats */
244 hw->mbx.stats.msgs_tx++;
245
246 out_no_write:
247 return ret_val;
248 }
249
250 /**
251 * ngbe_read_mbx_pf - Read a message from the mailbox
252 * @hw: pointer to the HW structure
253 * @msg: The message buffer
254 * @size: Length of buffer
255 * @vf_number: the VF index
256 *
257 * This function copies a message from the mailbox buffer to the caller's
258 * memory buffer. The presumption is that the caller knows that there was
259 * a message due to a VF request so no polling for message is needed.
260 **/
ngbe_read_mbx_pf(struct ngbe_hw * hw,u32 * msg,u16 size,u16 vf_number)261 s32 ngbe_read_mbx_pf(struct ngbe_hw *hw, u32 *msg, u16 size, u16 vf_number)
262 {
263 s32 ret_val;
264 u16 i;
265
266 /* lock the mailbox to prevent pf/vf race condition */
267 ret_val = ngbe_obtain_mbx_lock_pf(hw, vf_number);
268 if (ret_val)
269 goto out_no_read;
270
271 /* copy the message to the mailbox memory buffer */
272 for (i = 0; i < size; i++)
273 msg[i] = rd32a(hw, NGBE_MBMEM(vf_number), i);
274
275 /* Acknowledge the message and release buffer */
276 wr32(hw, NGBE_MBCTL(vf_number), NGBE_MBCTL_ACK);
277
278 /* update stats */
279 hw->mbx.stats.msgs_rx++;
280
281 out_no_read:
282 return ret_val;
283 }
284
285 /**
286 * ngbe_init_mbx_params_pf - set initial values for pf mailbox
287 * @hw: pointer to the HW structure
288 *
289 * Initializes the hw->mbx struct to correct values for pf mailbox
290 */
ngbe_init_mbx_params_pf(struct ngbe_hw * hw)291 void ngbe_init_mbx_params_pf(struct ngbe_hw *hw)
292 {
293 struct ngbe_mbx_info *mbx = &hw->mbx;
294
295 mbx->timeout = 0;
296 mbx->usec_delay = 0;
297
298 mbx->size = NGBE_P2VMBX_SIZE;
299
300 mbx->stats.msgs_tx = 0;
301 mbx->stats.msgs_rx = 0;
302 mbx->stats.reqs = 0;
303 mbx->stats.acks = 0;
304 mbx->stats.rsts = 0;
305 }
306