Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[cascardo/linux.git] / drivers / net / ethernet / hisilicon / hns / hns_dsaf_misc.c
1 /*
2  * Copyright (c) 2014-2015 Hisilicon Limited.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  */
9
10 #include "hns_dsaf_mac.h"
11 #include "hns_dsaf_misc.h"
12 #include "hns_dsaf_ppe.h"
13 #include "hns_dsaf_reg.h"
14
15 enum _dsm_op_index {
16         HNS_OP_RESET_FUNC               = 0x1,
17         HNS_OP_SERDES_LP_FUNC           = 0x2,
18         HNS_OP_LED_SET_FUNC             = 0x3,
19         HNS_OP_GET_PORT_TYPE_FUNC       = 0x4,
20         HNS_OP_GET_SFP_STAT_FUNC        = 0x5,
21 };
22
23 enum _dsm_rst_type {
24         HNS_DSAF_RESET_FUNC     = 0x1,
25         HNS_PPE_RESET_FUNC      = 0x2,
26         HNS_XGE_CORE_RESET_FUNC = 0x3,
27         HNS_XGE_RESET_FUNC      = 0x4,
28         HNS_GE_RESET_FUNC       = 0x5,
29 };
30
31 const u8 hns_dsaf_acpi_dsm_uuid[] = {
32         0x1A, 0xAA, 0x85, 0x1A, 0x93, 0xE2, 0x5E, 0x41,
33         0x8E, 0x28, 0x8D, 0x69, 0x0A, 0x0F, 0x82, 0x0A
34 };
35
36 static void dsaf_write_sub(struct dsaf_device *dsaf_dev, u32 reg, u32 val)
37 {
38         if (dsaf_dev->sub_ctrl)
39                 dsaf_write_syscon(dsaf_dev->sub_ctrl, reg, val);
40         else
41                 dsaf_write_reg(dsaf_dev->sc_base, reg, val);
42 }
43
44 static u32 dsaf_read_sub(struct dsaf_device *dsaf_dev, u32 reg)
45 {
46         u32 ret;
47
48         if (dsaf_dev->sub_ctrl)
49                 ret = dsaf_read_syscon(dsaf_dev->sub_ctrl, reg);
50         else
51                 ret = dsaf_read_reg(dsaf_dev->sc_base, reg);
52
53         return ret;
54 }
55
56 static void hns_cpld_set_led(struct hns_mac_cb *mac_cb, int link_status,
57                              u16 speed, int data)
58 {
59         int speed_reg = 0;
60         u8 value;
61
62         if (!mac_cb) {
63                 pr_err("sfp_led_opt mac_dev is null!\n");
64                 return;
65         }
66         if (!mac_cb->cpld_ctrl) {
67                 dev_err(mac_cb->dev, "mac_id=%d, cpld syscon is null !\n",
68                         mac_cb->mac_id);
69                 return;
70         }
71
72         if (speed == MAC_SPEED_10000)
73                 speed_reg = 1;
74
75         value = mac_cb->cpld_led_value;
76
77         if (link_status) {
78                 dsaf_set_bit(value, DSAF_LED_LINK_B, link_status);
79                 dsaf_set_field(value, DSAF_LED_SPEED_M,
80                                DSAF_LED_SPEED_S, speed_reg);
81                 dsaf_set_bit(value, DSAF_LED_DATA_B, data);
82
83                 if (value != mac_cb->cpld_led_value) {
84                         dsaf_write_syscon(mac_cb->cpld_ctrl,
85                                           mac_cb->cpld_ctrl_reg, value);
86                         mac_cb->cpld_led_value = value;
87                 }
88         } else {
89                 value = (mac_cb->cpld_led_value) & (0x1 << DSAF_LED_ANCHOR_B);
90                 dsaf_write_syscon(mac_cb->cpld_ctrl,
91                                   mac_cb->cpld_ctrl_reg, value);
92                 mac_cb->cpld_led_value = value;
93         }
94 }
95
96 static void cpld_led_reset(struct hns_mac_cb *mac_cb)
97 {
98         if (!mac_cb || !mac_cb->cpld_ctrl)
99                 return;
100
101         dsaf_write_syscon(mac_cb->cpld_ctrl, mac_cb->cpld_ctrl_reg,
102                           CPLD_LED_DEFAULT_VALUE);
103         mac_cb->cpld_led_value = CPLD_LED_DEFAULT_VALUE;
104 }
105
106 static int cpld_set_led_id(struct hns_mac_cb *mac_cb,
107                            enum hnae_led_state status)
108 {
109         switch (status) {
110         case HNAE_LED_ACTIVE:
111                 mac_cb->cpld_led_value =
112                         dsaf_read_syscon(mac_cb->cpld_ctrl,
113                                          mac_cb->cpld_ctrl_reg);
114                 dsaf_set_bit(mac_cb->cpld_led_value, DSAF_LED_ANCHOR_B,
115                              CPLD_LED_ON_VALUE);
116                 dsaf_write_syscon(mac_cb->cpld_ctrl, mac_cb->cpld_ctrl_reg,
117                                   mac_cb->cpld_led_value);
118                 break;
119         case HNAE_LED_INACTIVE:
120                 dsaf_set_bit(mac_cb->cpld_led_value, DSAF_LED_ANCHOR_B,
121                              CPLD_LED_DEFAULT_VALUE);
122                 dsaf_write_syscon(mac_cb->cpld_ctrl, mac_cb->cpld_ctrl_reg,
123                                   mac_cb->cpld_led_value);
124                 break;
125         default:
126                 dev_err(mac_cb->dev, "invalid led state: %d!", status);
127                 return -EINVAL;
128         }
129
130         return 0;
131 }
132
133 #define RESET_REQ_OR_DREQ 1
134
135 static void hns_dsaf_acpi_srst_by_port(struct dsaf_device *dsaf_dev, u8 op_type,
136                                        u32 port_type, u32 port, u32 val)
137 {
138         union acpi_object *obj;
139         union acpi_object obj_args[3], argv4;
140
141         obj_args[0].integer.type = ACPI_TYPE_INTEGER;
142         obj_args[0].integer.value = port_type;
143         obj_args[1].integer.type = ACPI_TYPE_INTEGER;
144         obj_args[1].integer.value = port;
145         obj_args[2].integer.type = ACPI_TYPE_INTEGER;
146         obj_args[2].integer.value = val;
147
148         argv4.type = ACPI_TYPE_PACKAGE;
149         argv4.package.count = 3;
150         argv4.package.elements = obj_args;
151
152         obj = acpi_evaluate_dsm(ACPI_HANDLE(dsaf_dev->dev),
153                                 hns_dsaf_acpi_dsm_uuid, 0, op_type, &argv4);
154         if (!obj) {
155                 dev_warn(dsaf_dev->dev, "reset port_type%d port%d fail!",
156                          port_type, port);
157                 return;
158         }
159
160         ACPI_FREE(obj);
161 }
162
163 static void hns_dsaf_rst(struct dsaf_device *dsaf_dev, bool dereset)
164 {
165         u32 xbar_reg_addr;
166         u32 nt_reg_addr;
167
168         if (!dereset) {
169                 xbar_reg_addr = DSAF_SUB_SC_XBAR_RESET_REQ_REG;
170                 nt_reg_addr = DSAF_SUB_SC_NT_RESET_REQ_REG;
171         } else {
172                 xbar_reg_addr = DSAF_SUB_SC_XBAR_RESET_DREQ_REG;
173                 nt_reg_addr = DSAF_SUB_SC_NT_RESET_DREQ_REG;
174         }
175
176         dsaf_write_sub(dsaf_dev, xbar_reg_addr, RESET_REQ_OR_DREQ);
177         dsaf_write_sub(dsaf_dev, nt_reg_addr, RESET_REQ_OR_DREQ);
178 }
179
180 static void hns_dsaf_rst_acpi(struct dsaf_device *dsaf_dev, bool dereset)
181 {
182         hns_dsaf_acpi_srst_by_port(dsaf_dev, HNS_OP_RESET_FUNC,
183                                    HNS_DSAF_RESET_FUNC,
184                                    0, dereset);
185 }
186
187 static void hns_dsaf_xge_srst_by_port(struct dsaf_device *dsaf_dev, u32 port,
188                                       bool dereset)
189 {
190         u32 reg_val = 0;
191         u32 reg_addr;
192
193         if (port >= DSAF_XGE_NUM)
194                 return;
195
196         reg_val |= RESET_REQ_OR_DREQ;
197         reg_val |= 0x2082082 << dsaf_dev->mac_cb[port]->port_rst_off;
198
199         if (!dereset)
200                 reg_addr = DSAF_SUB_SC_XGE_RESET_REQ_REG;
201         else
202                 reg_addr = DSAF_SUB_SC_XGE_RESET_DREQ_REG;
203
204         dsaf_write_sub(dsaf_dev, reg_addr, reg_val);
205 }
206
207 static void hns_dsaf_xge_srst_by_port_acpi(struct dsaf_device *dsaf_dev,
208                                            u32 port, bool dereset)
209 {
210         hns_dsaf_acpi_srst_by_port(dsaf_dev, HNS_OP_RESET_FUNC,
211                                    HNS_XGE_RESET_FUNC, port, dereset);
212 }
213
214 static void hns_dsaf_xge_core_srst_by_port(struct dsaf_device *dsaf_dev,
215                                            u32 port, bool dereset)
216 {
217         u32 reg_val = 0;
218         u32 reg_addr;
219
220         if (port >= DSAF_XGE_NUM)
221                 return;
222
223         reg_val |= XGMAC_TRX_CORE_SRST_M
224                 << dsaf_dev->mac_cb[port]->port_rst_off;
225
226         if (!dereset)
227                 reg_addr = DSAF_SUB_SC_XGE_RESET_REQ_REG;
228         else
229                 reg_addr = DSAF_SUB_SC_XGE_RESET_DREQ_REG;
230
231         dsaf_write_sub(dsaf_dev, reg_addr, reg_val);
232 }
233
234 static void
235 hns_dsaf_xge_core_srst_by_port_acpi(struct dsaf_device *dsaf_dev,
236                                     u32 port, bool dereset)
237 {
238         hns_dsaf_acpi_srst_by_port(dsaf_dev, HNS_OP_RESET_FUNC,
239                                    HNS_XGE_CORE_RESET_FUNC, port, dereset);
240 }
241
242 static void hns_dsaf_ge_srst_by_port(struct dsaf_device *dsaf_dev, u32 port,
243                                      bool dereset)
244 {
245         u32 reg_val_1;
246         u32 reg_val_2;
247         u32 port_rst_off;
248
249         if (port >= DSAF_GE_NUM)
250                 return;
251
252         if (!HNS_DSAF_IS_DEBUG(dsaf_dev)) {
253                 reg_val_1  = 0x1 << port;
254                 port_rst_off = dsaf_dev->mac_cb[port]->port_rst_off;
255                 /* there is difference between V1 and V2 in register.*/
256                 reg_val_2 = AE_IS_VER1(dsaf_dev->dsaf_ver) ?
257                                 0x1041041 : 0x2082082;
258                 reg_val_2 <<= port_rst_off;
259
260                 if (!dereset) {
261                         dsaf_write_sub(dsaf_dev, DSAF_SUB_SC_GE_RESET_REQ1_REG,
262                                        reg_val_1);
263
264                         dsaf_write_sub(dsaf_dev, DSAF_SUB_SC_GE_RESET_REQ0_REG,
265                                        reg_val_2);
266                 } else {
267                         dsaf_write_sub(dsaf_dev, DSAF_SUB_SC_GE_RESET_DREQ0_REG,
268                                        reg_val_2);
269
270                         dsaf_write_sub(dsaf_dev, DSAF_SUB_SC_GE_RESET_DREQ1_REG,
271                                        reg_val_1);
272                 }
273         } else {
274                 reg_val_1 = 0x15540;
275                 reg_val_2 = AE_IS_VER1(dsaf_dev->dsaf_ver) ? 0x100 : 0x40;
276
277                 reg_val_1 <<= dsaf_dev->reset_offset;
278                 reg_val_2 <<= dsaf_dev->reset_offset;
279
280                 if (!dereset) {
281                         dsaf_write_sub(dsaf_dev, DSAF_SUB_SC_GE_RESET_REQ1_REG,
282                                        reg_val_1);
283
284                         dsaf_write_sub(dsaf_dev, DSAF_SUB_SC_PPE_RESET_REQ_REG,
285                                        reg_val_2);
286                 } else {
287                         dsaf_write_sub(dsaf_dev, DSAF_SUB_SC_GE_RESET_DREQ1_REG,
288                                        reg_val_1);
289
290                         dsaf_write_sub(dsaf_dev, DSAF_SUB_SC_PPE_RESET_DREQ_REG,
291                                        reg_val_2);
292                 }
293         }
294 }
295
296 static void hns_dsaf_ge_srst_by_port_acpi(struct dsaf_device *dsaf_dev,
297                                           u32 port, bool dereset)
298 {
299         hns_dsaf_acpi_srst_by_port(dsaf_dev, HNS_OP_RESET_FUNC,
300                                    HNS_GE_RESET_FUNC, port, dereset);
301 }
302
303 static void hns_ppe_srst_by_port(struct dsaf_device *dsaf_dev, u32 port,
304                                  bool dereset)
305 {
306         u32 reg_val = 0;
307         u32 reg_addr;
308
309         reg_val |= RESET_REQ_OR_DREQ << dsaf_dev->mac_cb[port]->port_rst_off;
310
311         if (!dereset)
312                 reg_addr = DSAF_SUB_SC_PPE_RESET_REQ_REG;
313         else
314                 reg_addr = DSAF_SUB_SC_PPE_RESET_DREQ_REG;
315
316         dsaf_write_sub(dsaf_dev, reg_addr, reg_val);
317 }
318
319 static void
320 hns_ppe_srst_by_port_acpi(struct dsaf_device *dsaf_dev, u32 port, bool dereset)
321 {
322         hns_dsaf_acpi_srst_by_port(dsaf_dev, HNS_OP_RESET_FUNC,
323                                    HNS_PPE_RESET_FUNC, port, dereset);
324 }
325
326 static void hns_ppe_com_srst(struct dsaf_device *dsaf_dev, bool dereset)
327 {
328         u32 reg_val;
329         u32 reg_addr;
330
331         if (!(dev_of_node(dsaf_dev->dev)))
332                 return;
333
334         if (!HNS_DSAF_IS_DEBUG(dsaf_dev)) {
335                 reg_val = RESET_REQ_OR_DREQ;
336                 if (!dereset)
337                         reg_addr = DSAF_SUB_SC_RCB_PPE_COM_RESET_REQ_REG;
338                 else
339                         reg_addr = DSAF_SUB_SC_RCB_PPE_COM_RESET_DREQ_REG;
340
341         } else {
342                 reg_val = 0x100 << dsaf_dev->reset_offset;
343
344                 if (!dereset)
345                         reg_addr = DSAF_SUB_SC_PPE_RESET_REQ_REG;
346                 else
347                         reg_addr = DSAF_SUB_SC_PPE_RESET_DREQ_REG;
348         }
349
350         dsaf_write_sub(dsaf_dev, reg_addr, reg_val);
351 }
352
353 /**
354  * hns_mac_get_sds_mode - get phy ifterface form serdes mode
355  * @mac_cb: mac control block
356  * retuen phy interface
357  */
358 static phy_interface_t hns_mac_get_phy_if(struct hns_mac_cb *mac_cb)
359 {
360         u32 mode;
361         u32 reg;
362         bool is_ver1 = AE_IS_VER1(mac_cb->dsaf_dev->dsaf_ver);
363         int mac_id = mac_cb->mac_id;
364         phy_interface_t phy_if;
365
366         if (is_ver1) {
367                 if (HNS_DSAF_IS_DEBUG(mac_cb->dsaf_dev))
368                         return PHY_INTERFACE_MODE_SGMII;
369
370                 if (mac_id >= 0 && mac_id <= 3)
371                         reg = HNS_MAC_HILINK4_REG;
372                 else
373                         reg = HNS_MAC_HILINK3_REG;
374         } else{
375                 if (!HNS_DSAF_IS_DEBUG(mac_cb->dsaf_dev) && mac_id <= 3)
376                         reg = HNS_MAC_HILINK4V2_REG;
377                 else
378                         reg = HNS_MAC_HILINK3V2_REG;
379         }
380
381         mode = dsaf_read_sub(mac_cb->dsaf_dev, reg);
382         if (dsaf_get_bit(mode, mac_cb->port_mode_off))
383                 phy_if = PHY_INTERFACE_MODE_XGMII;
384         else
385                 phy_if = PHY_INTERFACE_MODE_SGMII;
386
387         return phy_if;
388 }
389
390 static phy_interface_t hns_mac_get_phy_if_acpi(struct hns_mac_cb *mac_cb)
391 {
392         phy_interface_t phy_if = PHY_INTERFACE_MODE_NA;
393         union acpi_object *obj;
394         union acpi_object obj_args, argv4;
395
396         obj_args.integer.type = ACPI_TYPE_INTEGER;
397         obj_args.integer.value = mac_cb->mac_id;
398
399         argv4.type = ACPI_TYPE_PACKAGE,
400         argv4.package.count = 1,
401         argv4.package.elements = &obj_args,
402
403         obj = acpi_evaluate_dsm(ACPI_HANDLE(mac_cb->dev),
404                                 hns_dsaf_acpi_dsm_uuid, 0,
405                                 HNS_OP_GET_PORT_TYPE_FUNC, &argv4);
406
407         if (!obj || obj->type != ACPI_TYPE_INTEGER)
408                 return phy_if;
409
410         phy_if = obj->integer.value ?
411                 PHY_INTERFACE_MODE_XGMII : PHY_INTERFACE_MODE_SGMII;
412
413         dev_dbg(mac_cb->dev, "mac_id=%d, phy_if=%d\n", mac_cb->mac_id, phy_if);
414
415         ACPI_FREE(obj);
416
417         return phy_if;
418 }
419
420 int hns_mac_get_sfp_prsnt(struct hns_mac_cb *mac_cb, int *sfp_prsnt)
421 {
422         if (!mac_cb->cpld_ctrl)
423                 return -ENODEV;
424
425         *sfp_prsnt = !dsaf_read_syscon(mac_cb->cpld_ctrl, mac_cb->cpld_ctrl_reg
426                                         + MAC_SFP_PORT_OFFSET);
427
428         return 0;
429 }
430
431 /**
432  * hns_mac_config_sds_loopback - set loop back for serdes
433  * @mac_cb: mac control block
434  * retuen 0 == success
435  */
436 static int hns_mac_config_sds_loopback(struct hns_mac_cb *mac_cb, bool en)
437 {
438         const u8 lane_id[] = {
439                 0,      /* mac 0 -> lane 0 */
440                 1,      /* mac 1 -> lane 1 */
441                 2,      /* mac 2 -> lane 2 */
442                 3,      /* mac 3 -> lane 3 */
443                 2,      /* mac 4 -> lane 2 */
444                 3,      /* mac 5 -> lane 3 */
445                 0,      /* mac 6 -> lane 0 */
446                 1       /* mac 7 -> lane 1 */
447         };
448 #define RX_CSR(lane, reg) ((0x4080 + (reg) * 0x0002 + (lane) * 0x0200) * 2)
449         u64 reg_offset = RX_CSR(lane_id[mac_cb->mac_id], 0);
450
451         int sfp_prsnt;
452         int ret = hns_mac_get_sfp_prsnt(mac_cb, &sfp_prsnt);
453
454         if (!mac_cb->phy_dev) {
455                 if (ret)
456                         pr_info("please confirm sfp is present or not\n");
457                 else
458                         if (!sfp_prsnt)
459                                 pr_info("no sfp in this eth\n");
460         }
461
462         if (mac_cb->serdes_ctrl) {
463                 u32 origin;
464
465                 if (!AE_IS_VER1(mac_cb->dsaf_dev->dsaf_ver)) {
466 #define HILINK_ACCESS_SEL_CFG           0x40008
467                         /* hilink4 & hilink3 use the same xge training and
468                          * xge u adaptor. There is a hilink access sel cfg
469                          * register to select which one to be configed
470                          */
471                         if ((!HNS_DSAF_IS_DEBUG(mac_cb->dsaf_dev)) &&
472                             (mac_cb->mac_id <= 3))
473                                 dsaf_write_syscon(mac_cb->serdes_ctrl,
474                                                   HILINK_ACCESS_SEL_CFG, 0);
475                         else
476                                 dsaf_write_syscon(mac_cb->serdes_ctrl,
477                                                   HILINK_ACCESS_SEL_CFG, 3);
478                 }
479
480                 origin = dsaf_read_syscon(mac_cb->serdes_ctrl, reg_offset);
481
482                 dsaf_set_field(origin, 1ull << 10, 10, en);
483                 dsaf_write_syscon(mac_cb->serdes_ctrl, reg_offset, origin);
484         } else {
485                 u8 *base_addr = (u8 *)mac_cb->serdes_vaddr +
486                                 (mac_cb->mac_id <= 3 ? 0x00280000 : 0x00200000);
487                 dsaf_set_reg_field(base_addr, reg_offset, 1ull << 10, 10, en);
488         }
489
490         return 0;
491 }
492
493 static int
494 hns_mac_config_sds_loopback_acpi(struct hns_mac_cb *mac_cb, bool en)
495 {
496         union acpi_object *obj;
497         union acpi_object obj_args[3], argv4;
498
499         obj_args[0].integer.type = ACPI_TYPE_INTEGER;
500         obj_args[0].integer.value = mac_cb->mac_id;
501         obj_args[1].integer.type = ACPI_TYPE_INTEGER;
502         obj_args[1].integer.value = !!en;
503
504         argv4.type = ACPI_TYPE_PACKAGE;
505         argv4.package.count = 2;
506         argv4.package.elements = obj_args;
507
508         obj = acpi_evaluate_dsm(ACPI_HANDLE(mac_cb->dsaf_dev->dev),
509                                 hns_dsaf_acpi_dsm_uuid, 0,
510                                 HNS_OP_SERDES_LP_FUNC, &argv4);
511         if (!obj) {
512                 dev_warn(mac_cb->dsaf_dev->dev, "set port%d serdes lp fail!",
513                          mac_cb->mac_id);
514
515                 return -ENOTSUPP;
516         }
517
518         ACPI_FREE(obj);
519
520         return 0;
521 }
522
523 struct dsaf_misc_op *hns_misc_op_get(struct dsaf_device *dsaf_dev)
524 {
525         struct dsaf_misc_op *misc_op;
526
527         misc_op = devm_kzalloc(dsaf_dev->dev, sizeof(*misc_op), GFP_KERNEL);
528         if (!misc_op)
529                 return NULL;
530
531         if (dev_of_node(dsaf_dev->dev)) {
532                 misc_op->cpld_set_led = hns_cpld_set_led;
533                 misc_op->cpld_reset_led = cpld_led_reset;
534                 misc_op->cpld_set_led_id = cpld_set_led_id;
535
536                 misc_op->dsaf_reset = hns_dsaf_rst;
537                 misc_op->xge_srst = hns_dsaf_xge_srst_by_port;
538                 misc_op->xge_core_srst = hns_dsaf_xge_core_srst_by_port;
539                 misc_op->ge_srst = hns_dsaf_ge_srst_by_port;
540                 misc_op->ppe_srst = hns_ppe_srst_by_port;
541                 misc_op->ppe_comm_srst = hns_ppe_com_srst;
542
543                 misc_op->get_phy_if = hns_mac_get_phy_if;
544                 misc_op->get_sfp_prsnt = hns_mac_get_sfp_prsnt;
545
546                 misc_op->cfg_serdes_loopback = hns_mac_config_sds_loopback;
547         } else if (is_acpi_node(dsaf_dev->dev->fwnode)) {
548                 misc_op->cpld_set_led = hns_cpld_set_led;
549                 misc_op->cpld_reset_led = cpld_led_reset;
550                 misc_op->cpld_set_led_id = cpld_set_led_id;
551
552                 misc_op->dsaf_reset = hns_dsaf_rst_acpi;
553                 misc_op->xge_srst = hns_dsaf_xge_srst_by_port_acpi;
554                 misc_op->xge_core_srst = hns_dsaf_xge_core_srst_by_port_acpi;
555                 misc_op->ge_srst = hns_dsaf_ge_srst_by_port_acpi;
556                 misc_op->ppe_srst = hns_ppe_srst_by_port_acpi;
557                 misc_op->ppe_comm_srst = hns_ppe_com_srst;
558
559                 misc_op->get_phy_if = hns_mac_get_phy_if_acpi;
560                 misc_op->get_sfp_prsnt = hns_mac_get_sfp_prsnt;
561
562                 misc_op->cfg_serdes_loopback = hns_mac_config_sds_loopback_acpi;
563         } else {
564                 devm_kfree(dsaf_dev->dev, (void *)misc_op);
565                 misc_op = NULL;
566         }
567
568         return (void *)misc_op;
569 }