1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright Altera Corporation (C) 2014. All rights reserved.
3 *
4 * Adopted from dwmac-sti.c
5 */
6
7 #include <linux/mfd/altera-sysmgr.h>
8 #include <linux/of.h>
9 #include <linux/of_address.h>
10 #include <linux/of_net.h>
11 #include <linux/phy.h>
12 #include <linux/regmap.h>
13 #include <linux/reset.h>
14 #include <linux/stmmac.h>
15
16 #include "stmmac.h"
17 #include "stmmac_platform.h"
18
19 #include "altr_tse_pcs.h"
20
21 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII 0x0
22 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII 0x1
23 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII 0x2
24 #define SYSMGR_EMACGRP_CTRL_PHYSEL_WIDTH 2
25 #define SYSMGR_EMACGRP_CTRL_PHYSEL_MASK 0x00000003
26 #define SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK 0x00000010
27 #define SYSMGR_GEN10_EMACGRP_CTRL_PTP_REF_CLK_MASK 0x00000100
28
29 #define SYSMGR_FPGAGRP_MODULE_REG 0x00000028
30 #define SYSMGR_FPGAGRP_MODULE_EMAC 0x00000004
31 #define SYSMGR_FPGAINTF_EMAC_REG 0x00000070
32 #define SYSMGR_FPGAINTF_EMAC_BIT 0x1
33
34 #define EMAC_SPLITTER_CTRL_REG 0x0
35 #define EMAC_SPLITTER_CTRL_SPEED_MASK 0x3
36 #define EMAC_SPLITTER_CTRL_SPEED_10 0x2
37 #define EMAC_SPLITTER_CTRL_SPEED_100 0x3
38 #define EMAC_SPLITTER_CTRL_SPEED_1000 0x0
39
40 struct socfpga_dwmac;
41 struct socfpga_dwmac_ops {
42 int (*set_phy_mode)(struct socfpga_dwmac *dwmac_priv);
43 };
44
45 struct socfpga_dwmac {
46 u32 reg_offset;
47 u32 reg_shift;
48 struct device *dev;
49 struct regmap *sys_mgr_base_addr;
50 struct reset_control *stmmac_rst;
51 struct reset_control *stmmac_ocp_rst;
52 void __iomem *splitter_base;
53 bool f2h_ptp_ref_clk;
54 struct tse_pcs pcs;
55 const struct socfpga_dwmac_ops *ops;
56 };
57
socfpga_dwmac_fix_mac_speed(void * priv,unsigned int speed)58 static void socfpga_dwmac_fix_mac_speed(void *priv, unsigned int speed)
59 {
60 struct socfpga_dwmac *dwmac = (struct socfpga_dwmac *)priv;
61 void __iomem *splitter_base = dwmac->splitter_base;
62 void __iomem *sgmii_adapter_base = dwmac->pcs.sgmii_adapter_base;
63 struct device *dev = dwmac->dev;
64 struct net_device *ndev = dev_get_drvdata(dev);
65 struct phy_device *phy_dev = ndev->phydev;
66 u32 val;
67
68 if (sgmii_adapter_base)
69 writew(SGMII_ADAPTER_DISABLE,
70 sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
71
72 if (splitter_base) {
73 val = readl(splitter_base + EMAC_SPLITTER_CTRL_REG);
74 val &= ~EMAC_SPLITTER_CTRL_SPEED_MASK;
75
76 switch (speed) {
77 case 1000:
78 val |= EMAC_SPLITTER_CTRL_SPEED_1000;
79 break;
80 case 100:
81 val |= EMAC_SPLITTER_CTRL_SPEED_100;
82 break;
83 case 10:
84 val |= EMAC_SPLITTER_CTRL_SPEED_10;
85 break;
86 default:
87 return;
88 }
89 writel(val, splitter_base + EMAC_SPLITTER_CTRL_REG);
90 }
91
92 if (phy_dev && sgmii_adapter_base) {
93 writew(SGMII_ADAPTER_ENABLE,
94 sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
95 tse_pcs_fix_mac_speed(&dwmac->pcs, phy_dev, speed);
96 }
97 }
98
socfpga_dwmac_parse_data(struct socfpga_dwmac * dwmac,struct device * dev)99 static int socfpga_dwmac_parse_data(struct socfpga_dwmac *dwmac, struct device *dev)
100 {
101 struct device_node *np = dev->of_node;
102 struct regmap *sys_mgr_base_addr;
103 u32 reg_offset, reg_shift;
104 int ret, index;
105 struct device_node *np_splitter = NULL;
106 struct device_node *np_sgmii_adapter = NULL;
107 struct resource res_splitter;
108 struct resource res_tse_pcs;
109 struct resource res_sgmii_adapter;
110
111 sys_mgr_base_addr =
112 altr_sysmgr_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon");
113 if (IS_ERR(sys_mgr_base_addr)) {
114 dev_info(dev, "No sysmgr-syscon node found\n");
115 return PTR_ERR(sys_mgr_base_addr);
116 }
117
118 ret = of_property_read_u32_index(np, "altr,sysmgr-syscon", 1, ®_offset);
119 if (ret) {
120 dev_info(dev, "Could not read reg_offset from sysmgr-syscon!\n");
121 return -EINVAL;
122 }
123
124 ret = of_property_read_u32_index(np, "altr,sysmgr-syscon", 2, ®_shift);
125 if (ret) {
126 dev_info(dev, "Could not read reg_shift from sysmgr-syscon!\n");
127 return -EINVAL;
128 }
129
130 dwmac->f2h_ptp_ref_clk = of_property_read_bool(np, "altr,f2h_ptp_ref_clk");
131
132 np_splitter = of_parse_phandle(np, "altr,emac-splitter", 0);
133 if (np_splitter) {
134 ret = of_address_to_resource(np_splitter, 0, &res_splitter);
135 of_node_put(np_splitter);
136 if (ret) {
137 dev_info(dev, "Missing emac splitter address\n");
138 return -EINVAL;
139 }
140
141 dwmac->splitter_base = devm_ioremap_resource(dev, &res_splitter);
142 if (IS_ERR(dwmac->splitter_base)) {
143 dev_info(dev, "Failed to mapping emac splitter\n");
144 return PTR_ERR(dwmac->splitter_base);
145 }
146 }
147
148 np_sgmii_adapter = of_parse_phandle(np,
149 "altr,gmii-to-sgmii-converter", 0);
150 if (np_sgmii_adapter) {
151 index = of_property_match_string(np_sgmii_adapter, "reg-names",
152 "hps_emac_interface_splitter_avalon_slave");
153
154 if (index >= 0) {
155 if (of_address_to_resource(np_sgmii_adapter, index,
156 &res_splitter)) {
157 dev_err(dev,
158 "%s: ERROR: missing emac splitter address\n",
159 __func__);
160 ret = -EINVAL;
161 goto err_node_put;
162 }
163
164 dwmac->splitter_base =
165 devm_ioremap_resource(dev, &res_splitter);
166
167 if (IS_ERR(dwmac->splitter_base)) {
168 ret = PTR_ERR(dwmac->splitter_base);
169 goto err_node_put;
170 }
171 }
172
173 index = of_property_match_string(np_sgmii_adapter, "reg-names",
174 "gmii_to_sgmii_adapter_avalon_slave");
175
176 if (index >= 0) {
177 if (of_address_to_resource(np_sgmii_adapter, index,
178 &res_sgmii_adapter)) {
179 dev_err(dev,
180 "%s: ERROR: failed mapping adapter\n",
181 __func__);
182 ret = -EINVAL;
183 goto err_node_put;
184 }
185
186 dwmac->pcs.sgmii_adapter_base =
187 devm_ioremap_resource(dev, &res_sgmii_adapter);
188
189 if (IS_ERR(dwmac->pcs.sgmii_adapter_base)) {
190 ret = PTR_ERR(dwmac->pcs.sgmii_adapter_base);
191 goto err_node_put;
192 }
193 }
194
195 index = of_property_match_string(np_sgmii_adapter, "reg-names",
196 "eth_tse_control_port");
197
198 if (index >= 0) {
199 if (of_address_to_resource(np_sgmii_adapter, index,
200 &res_tse_pcs)) {
201 dev_err(dev,
202 "%s: ERROR: failed mapping tse control port\n",
203 __func__);
204 ret = -EINVAL;
205 goto err_node_put;
206 }
207
208 dwmac->pcs.tse_pcs_base =
209 devm_ioremap_resource(dev, &res_tse_pcs);
210
211 if (IS_ERR(dwmac->pcs.tse_pcs_base)) {
212 ret = PTR_ERR(dwmac->pcs.tse_pcs_base);
213 goto err_node_put;
214 }
215 }
216 }
217 dwmac->reg_offset = reg_offset;
218 dwmac->reg_shift = reg_shift;
219 dwmac->sys_mgr_base_addr = sys_mgr_base_addr;
220 dwmac->dev = dev;
221 of_node_put(np_sgmii_adapter);
222
223 return 0;
224
225 err_node_put:
226 of_node_put(np_sgmii_adapter);
227 return ret;
228 }
229
socfpga_get_plat_phymode(struct socfpga_dwmac * dwmac)230 static int socfpga_get_plat_phymode(struct socfpga_dwmac *dwmac)
231 {
232 struct net_device *ndev = dev_get_drvdata(dwmac->dev);
233 struct stmmac_priv *priv = netdev_priv(ndev);
234
235 return priv->plat->interface;
236 }
237
socfpga_set_phy_mode_common(int phymode,u32 * val)238 static int socfpga_set_phy_mode_common(int phymode, u32 *val)
239 {
240 switch (phymode) {
241 case PHY_INTERFACE_MODE_RGMII:
242 case PHY_INTERFACE_MODE_RGMII_ID:
243 case PHY_INTERFACE_MODE_RGMII_RXID:
244 case PHY_INTERFACE_MODE_RGMII_TXID:
245 *val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII;
246 break;
247 case PHY_INTERFACE_MODE_MII:
248 case PHY_INTERFACE_MODE_GMII:
249 case PHY_INTERFACE_MODE_SGMII:
250 *val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
251 break;
252 case PHY_INTERFACE_MODE_RMII:
253 *val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII;
254 break;
255 default:
256 return -EINVAL;
257 }
258 return 0;
259 }
260
socfpga_gen5_set_phy_mode(struct socfpga_dwmac * dwmac)261 static int socfpga_gen5_set_phy_mode(struct socfpga_dwmac *dwmac)
262 {
263 struct regmap *sys_mgr_base_addr = dwmac->sys_mgr_base_addr;
264 int phymode = socfpga_get_plat_phymode(dwmac);
265 u32 reg_offset = dwmac->reg_offset;
266 u32 reg_shift = dwmac->reg_shift;
267 u32 ctrl, val, module;
268
269 if (socfpga_set_phy_mode_common(phymode, &val)) {
270 dev_err(dwmac->dev, "bad phy mode %d\n", phymode);
271 return -EINVAL;
272 }
273
274 /* Overwrite val to GMII if splitter core is enabled. The phymode here
275 * is the actual phy mode on phy hardware, but phy interface from
276 * EMAC core is GMII.
277 */
278 if (dwmac->splitter_base)
279 val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
280
281 /* Assert reset to the enet controller before changing the phy mode */
282 reset_control_assert(dwmac->stmmac_ocp_rst);
283 reset_control_assert(dwmac->stmmac_rst);
284
285 regmap_read(sys_mgr_base_addr, reg_offset, &ctrl);
286 ctrl &= ~(SYSMGR_EMACGRP_CTRL_PHYSEL_MASK << reg_shift);
287 ctrl |= val << reg_shift;
288
289 if (dwmac->f2h_ptp_ref_clk ||
290 phymode == PHY_INTERFACE_MODE_MII ||
291 phymode == PHY_INTERFACE_MODE_GMII ||
292 phymode == PHY_INTERFACE_MODE_SGMII) {
293 regmap_read(sys_mgr_base_addr, SYSMGR_FPGAGRP_MODULE_REG,
294 &module);
295 module |= (SYSMGR_FPGAGRP_MODULE_EMAC << (reg_shift / 2));
296 regmap_write(sys_mgr_base_addr, SYSMGR_FPGAGRP_MODULE_REG,
297 module);
298 }
299
300 if (dwmac->f2h_ptp_ref_clk)
301 ctrl |= SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK << (reg_shift / 2);
302 else
303 ctrl &= ~(SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK <<
304 (reg_shift / 2));
305
306 regmap_write(sys_mgr_base_addr, reg_offset, ctrl);
307
308 /* Deassert reset for the phy configuration to be sampled by
309 * the enet controller, and operation to start in requested mode
310 */
311 reset_control_deassert(dwmac->stmmac_ocp_rst);
312 reset_control_deassert(dwmac->stmmac_rst);
313 if (phymode == PHY_INTERFACE_MODE_SGMII) {
314 if (tse_pcs_init(dwmac->pcs.tse_pcs_base, &dwmac->pcs) != 0) {
315 dev_err(dwmac->dev, "Unable to initialize TSE PCS");
316 return -EINVAL;
317 }
318 }
319
320 return 0;
321 }
322
socfpga_gen10_set_phy_mode(struct socfpga_dwmac * dwmac)323 static int socfpga_gen10_set_phy_mode(struct socfpga_dwmac *dwmac)
324 {
325 struct regmap *sys_mgr_base_addr = dwmac->sys_mgr_base_addr;
326 int phymode = socfpga_get_plat_phymode(dwmac);
327 u32 reg_offset = dwmac->reg_offset;
328 u32 reg_shift = dwmac->reg_shift;
329 u32 ctrl, val, module;
330
331 if (socfpga_set_phy_mode_common(phymode, &val))
332 return -EINVAL;
333
334 /* Overwrite val to GMII if splitter core is enabled. The phymode here
335 * is the actual phy mode on phy hardware, but phy interface from
336 * EMAC core is GMII.
337 */
338 if (dwmac->splitter_base)
339 val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
340
341 /* Assert reset to the enet controller before changing the phy mode */
342 reset_control_assert(dwmac->stmmac_ocp_rst);
343 reset_control_assert(dwmac->stmmac_rst);
344
345 regmap_read(sys_mgr_base_addr, reg_offset, &ctrl);
346 ctrl &= ~(SYSMGR_EMACGRP_CTRL_PHYSEL_MASK);
347 ctrl |= val;
348
349 if (dwmac->f2h_ptp_ref_clk ||
350 phymode == PHY_INTERFACE_MODE_MII ||
351 phymode == PHY_INTERFACE_MODE_GMII ||
352 phymode == PHY_INTERFACE_MODE_SGMII) {
353 ctrl |= SYSMGR_GEN10_EMACGRP_CTRL_PTP_REF_CLK_MASK;
354 regmap_read(sys_mgr_base_addr, SYSMGR_FPGAINTF_EMAC_REG,
355 &module);
356 module |= (SYSMGR_FPGAINTF_EMAC_BIT << reg_shift);
357 regmap_write(sys_mgr_base_addr, SYSMGR_FPGAINTF_EMAC_REG,
358 module);
359 } else {
360 ctrl &= ~SYSMGR_GEN10_EMACGRP_CTRL_PTP_REF_CLK_MASK;
361 }
362
363 regmap_write(sys_mgr_base_addr, reg_offset, ctrl);
364
365 /* Deassert reset for the phy configuration to be sampled by
366 * the enet controller, and operation to start in requested mode
367 */
368 reset_control_deassert(dwmac->stmmac_ocp_rst);
369 reset_control_deassert(dwmac->stmmac_rst);
370 if (phymode == PHY_INTERFACE_MODE_SGMII) {
371 if (tse_pcs_init(dwmac->pcs.tse_pcs_base, &dwmac->pcs) != 0) {
372 dev_err(dwmac->dev, "Unable to initialize TSE PCS");
373 return -EINVAL;
374 }
375 }
376 return 0;
377 }
378
socfpga_dwmac_probe(struct platform_device * pdev)379 static int socfpga_dwmac_probe(struct platform_device *pdev)
380 {
381 struct plat_stmmacenet_data *plat_dat;
382 struct stmmac_resources stmmac_res;
383 struct device *dev = &pdev->dev;
384 int ret;
385 struct socfpga_dwmac *dwmac;
386 struct net_device *ndev;
387 struct stmmac_priv *stpriv;
388 const struct socfpga_dwmac_ops *ops;
389
390 ops = device_get_match_data(&pdev->dev);
391 if (!ops) {
392 dev_err(&pdev->dev, "no of match data provided\n");
393 return -EINVAL;
394 }
395
396 ret = stmmac_get_platform_resources(pdev, &stmmac_res);
397 if (ret)
398 return ret;
399
400 plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
401 if (IS_ERR(plat_dat))
402 return PTR_ERR(plat_dat);
403
404 dwmac = devm_kzalloc(dev, sizeof(*dwmac), GFP_KERNEL);
405 if (!dwmac) {
406 ret = -ENOMEM;
407 goto err_remove_config_dt;
408 }
409
410 dwmac->stmmac_ocp_rst = devm_reset_control_get_optional(dev, "stmmaceth-ocp");
411 if (IS_ERR(dwmac->stmmac_ocp_rst)) {
412 ret = PTR_ERR(dwmac->stmmac_ocp_rst);
413 dev_err(dev, "error getting reset control of ocp %d\n", ret);
414 goto err_remove_config_dt;
415 }
416
417 reset_control_deassert(dwmac->stmmac_ocp_rst);
418
419 ret = socfpga_dwmac_parse_data(dwmac, dev);
420 if (ret) {
421 dev_err(dev, "Unable to parse OF data\n");
422 goto err_remove_config_dt;
423 }
424
425 dwmac->ops = ops;
426 plat_dat->bsp_priv = dwmac;
427 plat_dat->fix_mac_speed = socfpga_dwmac_fix_mac_speed;
428
429 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
430 if (ret)
431 goto err_remove_config_dt;
432
433 ndev = platform_get_drvdata(pdev);
434 stpriv = netdev_priv(ndev);
435
436 /* The socfpga driver needs to control the stmmac reset to set the phy
437 * mode. Create a copy of the core reset handle so it can be used by
438 * the driver later.
439 */
440 dwmac->stmmac_rst = stpriv->plat->stmmac_rst;
441
442 ret = ops->set_phy_mode(dwmac);
443 if (ret)
444 goto err_dvr_remove;
445
446 return 0;
447
448 err_dvr_remove:
449 stmmac_dvr_remove(&pdev->dev);
450 err_remove_config_dt:
451 stmmac_remove_config_dt(pdev, plat_dat);
452
453 return ret;
454 }
455
456 #ifdef CONFIG_PM_SLEEP
socfpga_dwmac_resume(struct device * dev)457 static int socfpga_dwmac_resume(struct device *dev)
458 {
459 struct net_device *ndev = dev_get_drvdata(dev);
460 struct stmmac_priv *priv = netdev_priv(ndev);
461 struct socfpga_dwmac *dwmac_priv = get_stmmac_bsp_priv(dev);
462
463 dwmac_priv->ops->set_phy_mode(priv->plat->bsp_priv);
464
465 /* Before the enet controller is suspended, the phy is suspended.
466 * This causes the phy clock to be gated. The enet controller is
467 * resumed before the phy, so the clock is still gated "off" when
468 * the enet controller is resumed. This code makes sure the phy
469 * is "resumed" before reinitializing the enet controller since
470 * the enet controller depends on an active phy clock to complete
471 * a DMA reset. A DMA reset will "time out" if executed
472 * with no phy clock input on the Synopsys enet controller.
473 * Verified through Synopsys Case #8000711656.
474 *
475 * Note that the phy clock is also gated when the phy is isolated.
476 * Phy "suspend" and "isolate" controls are located in phy basic
477 * control register 0, and can be modified by the phy driver
478 * framework.
479 */
480 if (ndev->phydev)
481 phy_resume(ndev->phydev);
482
483 return stmmac_resume(dev);
484 }
485 #endif /* CONFIG_PM_SLEEP */
486
socfpga_dwmac_runtime_suspend(struct device * dev)487 static int __maybe_unused socfpga_dwmac_runtime_suspend(struct device *dev)
488 {
489 struct net_device *ndev = dev_get_drvdata(dev);
490 struct stmmac_priv *priv = netdev_priv(ndev);
491
492 stmmac_bus_clks_config(priv, false);
493
494 return 0;
495 }
496
socfpga_dwmac_runtime_resume(struct device * dev)497 static int __maybe_unused socfpga_dwmac_runtime_resume(struct device *dev)
498 {
499 struct net_device *ndev = dev_get_drvdata(dev);
500 struct stmmac_priv *priv = netdev_priv(ndev);
501
502 return stmmac_bus_clks_config(priv, true);
503 }
504
505 static const struct dev_pm_ops socfpga_dwmac_pm_ops = {
506 SET_SYSTEM_SLEEP_PM_OPS(stmmac_suspend, socfpga_dwmac_resume)
507 SET_RUNTIME_PM_OPS(socfpga_dwmac_runtime_suspend, socfpga_dwmac_runtime_resume, NULL)
508 };
509
510 static const struct socfpga_dwmac_ops socfpga_gen5_ops = {
511 .set_phy_mode = socfpga_gen5_set_phy_mode,
512 };
513
514 static const struct socfpga_dwmac_ops socfpga_gen10_ops = {
515 .set_phy_mode = socfpga_gen10_set_phy_mode,
516 };
517
518 static const struct of_device_id socfpga_dwmac_match[] = {
519 { .compatible = "altr,socfpga-stmmac", .data = &socfpga_gen5_ops },
520 { .compatible = "altr,socfpga-stmmac-a10-s10", .data = &socfpga_gen10_ops },
521 { }
522 };
523 MODULE_DEVICE_TABLE(of, socfpga_dwmac_match);
524
525 static struct platform_driver socfpga_dwmac_driver = {
526 .probe = socfpga_dwmac_probe,
527 .remove = stmmac_pltfr_remove,
528 .driver = {
529 .name = "socfpga-dwmac",
530 .pm = &socfpga_dwmac_pm_ops,
531 .of_match_table = socfpga_dwmac_match,
532 },
533 };
534 module_platform_driver(socfpga_dwmac_driver);
535
536 MODULE_LICENSE("GPL v2");
537