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 SGMII_ADAPTER_CTRL_REG 0x00
22 #define SGMII_ADAPTER_DISABLE 0x0001
23
24 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII 0x0
25 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII 0x1
26 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII 0x2
27 #define SYSMGR_EMACGRP_CTRL_PHYSEL_WIDTH 2
28 #define SYSMGR_EMACGRP_CTRL_PHYSEL_MASK 0x00000003
29 #define SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK 0x00000010
30 #define SYSMGR_GEN10_EMACGRP_CTRL_PTP_REF_CLK_MASK 0x00000100
31
32 #define SYSMGR_FPGAGRP_MODULE_REG 0x00000028
33 #define SYSMGR_FPGAGRP_MODULE_EMAC 0x00000004
34 #define SYSMGR_FPGAINTF_EMAC_REG 0x00000070
35 #define SYSMGR_FPGAINTF_EMAC_BIT 0x1
36
37 #define EMAC_SPLITTER_CTRL_REG 0x0
38 #define EMAC_SPLITTER_CTRL_SPEED_MASK 0x3
39 #define EMAC_SPLITTER_CTRL_SPEED_10 0x2
40 #define EMAC_SPLITTER_CTRL_SPEED_100 0x3
41 #define EMAC_SPLITTER_CTRL_SPEED_1000 0x0
42
43 struct socfpga_dwmac;
44 struct socfpga_dwmac_ops {
45 int (*set_phy_mode)(struct socfpga_dwmac *dwmac_priv);
46 };
47
48 struct socfpga_dwmac {
49 u32 reg_offset;
50 u32 reg_shift;
51 struct device *dev;
52 struct regmap *sys_mgr_base_addr;
53 struct reset_control *stmmac_rst;
54 struct reset_control *stmmac_ocp_rst;
55 void __iomem *splitter_base;
56 bool f2h_ptp_ref_clk;
57 struct tse_pcs pcs;
58 const struct socfpga_dwmac_ops *ops;
59 };
60
socfpga_dwmac_fix_mac_speed(void * priv,unsigned int speed)61 static void socfpga_dwmac_fix_mac_speed(void *priv, unsigned int speed)
62 {
63 struct socfpga_dwmac *dwmac = (struct socfpga_dwmac *)priv;
64 void __iomem *splitter_base = dwmac->splitter_base;
65 void __iomem *tse_pcs_base = dwmac->pcs.tse_pcs_base;
66 void __iomem *sgmii_adapter_base = dwmac->pcs.sgmii_adapter_base;
67 struct device *dev = dwmac->dev;
68 struct net_device *ndev = dev_get_drvdata(dev);
69 struct phy_device *phy_dev = ndev->phydev;
70 u32 val;
71
72 if ((tse_pcs_base) && (sgmii_adapter_base))
73 writew(SGMII_ADAPTER_DISABLE,
74 sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
75
76 if (splitter_base) {
77 val = readl(splitter_base + EMAC_SPLITTER_CTRL_REG);
78 val &= ~EMAC_SPLITTER_CTRL_SPEED_MASK;
79
80 switch (speed) {
81 case 1000:
82 val |= EMAC_SPLITTER_CTRL_SPEED_1000;
83 break;
84 case 100:
85 val |= EMAC_SPLITTER_CTRL_SPEED_100;
86 break;
87 case 10:
88 val |= EMAC_SPLITTER_CTRL_SPEED_10;
89 break;
90 default:
91 return;
92 }
93 writel(val, splitter_base + EMAC_SPLITTER_CTRL_REG);
94 }
95
96 if (tse_pcs_base && sgmii_adapter_base)
97 tse_pcs_fix_mac_speed(&dwmac->pcs, phy_dev, speed);
98 }
99
socfpga_dwmac_parse_data(struct socfpga_dwmac * dwmac,struct device * dev)100 static int socfpga_dwmac_parse_data(struct socfpga_dwmac *dwmac, struct device *dev)
101 {
102 struct device_node *np = dev->of_node;
103 struct regmap *sys_mgr_base_addr;
104 u32 reg_offset, reg_shift;
105 int ret, index;
106 struct device_node *np_splitter = NULL;
107 struct device_node *np_sgmii_adapter = NULL;
108 struct resource res_splitter;
109 struct resource res_tse_pcs;
110 struct resource res_sgmii_adapter;
111
112 sys_mgr_base_addr =
113 altr_sysmgr_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon");
114 if (IS_ERR(sys_mgr_base_addr)) {
115 dev_info(dev, "No sysmgr-syscon node found\n");
116 return PTR_ERR(sys_mgr_base_addr);
117 }
118
119 ret = of_property_read_u32_index(np, "altr,sysmgr-syscon", 1, ®_offset);
120 if (ret) {
121 dev_info(dev, "Could not read reg_offset from sysmgr-syscon!\n");
122 return -EINVAL;
123 }
124
125 ret = of_property_read_u32_index(np, "altr,sysmgr-syscon", 2, ®_shift);
126 if (ret) {
127 dev_info(dev, "Could not read reg_shift from sysmgr-syscon!\n");
128 return -EINVAL;
129 }
130
131 dwmac->f2h_ptp_ref_clk = of_property_read_bool(np, "altr,f2h_ptp_ref_clk");
132
133 np_splitter = of_parse_phandle(np, "altr,emac-splitter", 0);
134 if (np_splitter) {
135 ret = of_address_to_resource(np_splitter, 0, &res_splitter);
136 of_node_put(np_splitter);
137 if (ret) {
138 dev_info(dev, "Missing emac splitter address\n");
139 return -EINVAL;
140 }
141
142 dwmac->splitter_base = devm_ioremap_resource(dev, &res_splitter);
143 if (IS_ERR(dwmac->splitter_base)) {
144 dev_info(dev, "Failed to mapping emac splitter\n");
145 return PTR_ERR(dwmac->splitter_base);
146 }
147 }
148
149 np_sgmii_adapter = of_parse_phandle(np,
150 "altr,gmii-to-sgmii-converter", 0);
151 if (np_sgmii_adapter) {
152 index = of_property_match_string(np_sgmii_adapter, "reg-names",
153 "hps_emac_interface_splitter_avalon_slave");
154
155 if (index >= 0) {
156 if (of_address_to_resource(np_sgmii_adapter, index,
157 &res_splitter)) {
158 dev_err(dev,
159 "%s: ERROR: missing emac splitter address\n",
160 __func__);
161 ret = -EINVAL;
162 goto err_node_put;
163 }
164
165 dwmac->splitter_base =
166 devm_ioremap_resource(dev, &res_splitter);
167
168 if (IS_ERR(dwmac->splitter_base)) {
169 ret = PTR_ERR(dwmac->splitter_base);
170 goto err_node_put;
171 }
172 }
173
174 index = of_property_match_string(np_sgmii_adapter, "reg-names",
175 "gmii_to_sgmii_adapter_avalon_slave");
176
177 if (index >= 0) {
178 if (of_address_to_resource(np_sgmii_adapter, index,
179 &res_sgmii_adapter)) {
180 dev_err(dev,
181 "%s: ERROR: failed mapping adapter\n",
182 __func__);
183 ret = -EINVAL;
184 goto err_node_put;
185 }
186
187 dwmac->pcs.sgmii_adapter_base =
188 devm_ioremap_resource(dev, &res_sgmii_adapter);
189
190 if (IS_ERR(dwmac->pcs.sgmii_adapter_base)) {
191 ret = PTR_ERR(dwmac->pcs.sgmii_adapter_base);
192 goto err_node_put;
193 }
194 }
195
196 index = of_property_match_string(np_sgmii_adapter, "reg-names",
197 "eth_tse_control_port");
198
199 if (index >= 0) {
200 if (of_address_to_resource(np_sgmii_adapter, index,
201 &res_tse_pcs)) {
202 dev_err(dev,
203 "%s: ERROR: failed mapping tse control port\n",
204 __func__);
205 ret = -EINVAL;
206 goto err_node_put;
207 }
208
209 dwmac->pcs.tse_pcs_base =
210 devm_ioremap_resource(dev, &res_tse_pcs);
211
212 if (IS_ERR(dwmac->pcs.tse_pcs_base)) {
213 ret = PTR_ERR(dwmac->pcs.tse_pcs_base);
214 goto err_node_put;
215 }
216 }
217 }
218 dwmac->reg_offset = reg_offset;
219 dwmac->reg_shift = reg_shift;
220 dwmac->sys_mgr_base_addr = sys_mgr_base_addr;
221 dwmac->dev = dev;
222 of_node_put(np_sgmii_adapter);
223
224 return 0;
225
226 err_node_put:
227 of_node_put(np_sgmii_adapter);
228 return ret;
229 }
230
socfpga_get_plat_phymode(struct socfpga_dwmac * dwmac)231 static int socfpga_get_plat_phymode(struct socfpga_dwmac *dwmac)
232 {
233 struct net_device *ndev = dev_get_drvdata(dwmac->dev);
234 struct stmmac_priv *priv = netdev_priv(ndev);
235
236 return priv->plat->interface;
237 }
238
socfpga_set_phy_mode_common(int phymode,u32 * val)239 static int socfpga_set_phy_mode_common(int phymode, u32 *val)
240 {
241 switch (phymode) {
242 case PHY_INTERFACE_MODE_RGMII:
243 case PHY_INTERFACE_MODE_RGMII_ID:
244 *val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII;
245 break;
246 case PHY_INTERFACE_MODE_MII:
247 case PHY_INTERFACE_MODE_GMII:
248 case PHY_INTERFACE_MODE_SGMII:
249 *val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
250 break;
251 case PHY_INTERFACE_MODE_RMII:
252 *val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII;
253 break;
254 default:
255 return -EINVAL;
256 }
257 return 0;
258 }
259
socfpga_gen5_set_phy_mode(struct socfpga_dwmac * dwmac)260 static int socfpga_gen5_set_phy_mode(struct socfpga_dwmac *dwmac)
261 {
262 struct regmap *sys_mgr_base_addr = dwmac->sys_mgr_base_addr;
263 int phymode = socfpga_get_plat_phymode(dwmac);
264 u32 reg_offset = dwmac->reg_offset;
265 u32 reg_shift = dwmac->reg_shift;
266 u32 ctrl, val, module;
267
268 if (socfpga_set_phy_mode_common(phymode, &val)) {
269 dev_err(dwmac->dev, "bad phy mode %d\n", phymode);
270 return -EINVAL;
271 }
272
273 /* Overwrite val to GMII if splitter core is enabled. The phymode here
274 * is the actual phy mode on phy hardware, but phy interface from
275 * EMAC core is GMII.
276 */
277 if (dwmac->splitter_base)
278 val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
279
280 /* Assert reset to the enet controller before changing the phy mode */
281 reset_control_assert(dwmac->stmmac_ocp_rst);
282 reset_control_assert(dwmac->stmmac_rst);
283
284 regmap_read(sys_mgr_base_addr, reg_offset, &ctrl);
285 ctrl &= ~(SYSMGR_EMACGRP_CTRL_PHYSEL_MASK << reg_shift);
286 ctrl |= val << reg_shift;
287
288 if (dwmac->f2h_ptp_ref_clk ||
289 phymode == PHY_INTERFACE_MODE_MII ||
290 phymode == PHY_INTERFACE_MODE_GMII ||
291 phymode == PHY_INTERFACE_MODE_SGMII) {
292 ctrl |= SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK << (reg_shift / 2);
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 } else {
299 ctrl &= ~(SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK << (reg_shift / 2));
300 }
301
302 regmap_write(sys_mgr_base_addr, reg_offset, ctrl);
303
304 /* Deassert reset for the phy configuration to be sampled by
305 * the enet controller, and operation to start in requested mode
306 */
307 reset_control_deassert(dwmac->stmmac_ocp_rst);
308 reset_control_deassert(dwmac->stmmac_rst);
309 if (phymode == PHY_INTERFACE_MODE_SGMII) {
310 if (tse_pcs_init(dwmac->pcs.tse_pcs_base, &dwmac->pcs) != 0) {
311 dev_err(dwmac->dev, "Unable to initialize TSE PCS");
312 return -EINVAL;
313 }
314 }
315
316 return 0;
317 }
318
socfpga_gen10_set_phy_mode(struct socfpga_dwmac * dwmac)319 static int socfpga_gen10_set_phy_mode(struct socfpga_dwmac *dwmac)
320 {
321 struct regmap *sys_mgr_base_addr = dwmac->sys_mgr_base_addr;
322 int phymode = socfpga_get_plat_phymode(dwmac);
323 u32 reg_offset = dwmac->reg_offset;
324 u32 reg_shift = dwmac->reg_shift;
325 u32 ctrl, val, module;
326
327 if (socfpga_set_phy_mode_common(phymode, &val))
328 return -EINVAL;
329
330 /* Overwrite val to GMII if splitter core is enabled. The phymode here
331 * is the actual phy mode on phy hardware, but phy interface from
332 * EMAC core is GMII.
333 */
334 if (dwmac->splitter_base)
335 val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
336
337 /* Assert reset to the enet controller before changing the phy mode */
338 reset_control_assert(dwmac->stmmac_ocp_rst);
339 reset_control_assert(dwmac->stmmac_rst);
340
341 regmap_read(sys_mgr_base_addr, reg_offset, &ctrl);
342 ctrl &= ~(SYSMGR_EMACGRP_CTRL_PHYSEL_MASK);
343 ctrl |= val;
344
345 if (dwmac->f2h_ptp_ref_clk ||
346 phymode == PHY_INTERFACE_MODE_MII ||
347 phymode == PHY_INTERFACE_MODE_GMII ||
348 phymode == PHY_INTERFACE_MODE_SGMII) {
349 ctrl |= SYSMGR_GEN10_EMACGRP_CTRL_PTP_REF_CLK_MASK;
350 regmap_read(sys_mgr_base_addr, SYSMGR_FPGAINTF_EMAC_REG,
351 &module);
352 module |= (SYSMGR_FPGAINTF_EMAC_BIT << reg_shift);
353 regmap_write(sys_mgr_base_addr, SYSMGR_FPGAINTF_EMAC_REG,
354 module);
355 } else {
356 ctrl &= ~SYSMGR_GEN10_EMACGRP_CTRL_PTP_REF_CLK_MASK;
357 }
358
359 regmap_write(sys_mgr_base_addr, reg_offset, ctrl);
360
361 /* Deassert reset for the phy configuration to be sampled by
362 * the enet controller, and operation to start in requested mode
363 */
364 reset_control_deassert(dwmac->stmmac_ocp_rst);
365 reset_control_deassert(dwmac->stmmac_rst);
366 if (phymode == PHY_INTERFACE_MODE_SGMII) {
367 if (tse_pcs_init(dwmac->pcs.tse_pcs_base, &dwmac->pcs) != 0) {
368 dev_err(dwmac->dev, "Unable to initialize TSE PCS");
369 return -EINVAL;
370 }
371 }
372 return 0;
373 }
374
socfpga_dwmac_probe(struct platform_device * pdev)375 static int socfpga_dwmac_probe(struct platform_device *pdev)
376 {
377 struct plat_stmmacenet_data *plat_dat;
378 struct stmmac_resources stmmac_res;
379 struct device *dev = &pdev->dev;
380 int ret;
381 struct socfpga_dwmac *dwmac;
382 struct net_device *ndev;
383 struct stmmac_priv *stpriv;
384 const struct socfpga_dwmac_ops *ops;
385
386 ops = device_get_match_data(&pdev->dev);
387 if (!ops) {
388 dev_err(&pdev->dev, "no of match data provided\n");
389 return -EINVAL;
390 }
391
392 ret = stmmac_get_platform_resources(pdev, &stmmac_res);
393 if (ret)
394 return ret;
395
396 plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
397 if (IS_ERR(plat_dat))
398 return PTR_ERR(plat_dat);
399
400 dwmac = devm_kzalloc(dev, sizeof(*dwmac), GFP_KERNEL);
401 if (!dwmac) {
402 ret = -ENOMEM;
403 goto err_remove_config_dt;
404 }
405
406 dwmac->stmmac_ocp_rst = devm_reset_control_get_optional(dev, "stmmaceth-ocp");
407 if (IS_ERR(dwmac->stmmac_ocp_rst)) {
408 ret = PTR_ERR(dwmac->stmmac_ocp_rst);
409 dev_err(dev, "error getting reset control of ocp %d\n", ret);
410 goto err_remove_config_dt;
411 }
412
413 reset_control_deassert(dwmac->stmmac_ocp_rst);
414
415 ret = socfpga_dwmac_parse_data(dwmac, dev);
416 if (ret) {
417 dev_err(dev, "Unable to parse OF data\n");
418 goto err_remove_config_dt;
419 }
420
421 dwmac->ops = ops;
422 plat_dat->bsp_priv = dwmac;
423 plat_dat->fix_mac_speed = socfpga_dwmac_fix_mac_speed;
424
425 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
426 if (ret)
427 goto err_remove_config_dt;
428
429 ndev = platform_get_drvdata(pdev);
430 stpriv = netdev_priv(ndev);
431
432 /* The socfpga driver needs to control the stmmac reset to set the phy
433 * mode. Create a copy of the core reset handle so it can be used by
434 * the driver later.
435 */
436 dwmac->stmmac_rst = stpriv->plat->stmmac_rst;
437
438 ret = ops->set_phy_mode(dwmac);
439 if (ret)
440 goto err_dvr_remove;
441
442 return 0;
443
444 err_dvr_remove:
445 stmmac_dvr_remove(&pdev->dev);
446 err_remove_config_dt:
447 stmmac_remove_config_dt(pdev, plat_dat);
448
449 return ret;
450 }
451
452 #ifdef CONFIG_PM_SLEEP
socfpga_dwmac_resume(struct device * dev)453 static int socfpga_dwmac_resume(struct device *dev)
454 {
455 struct net_device *ndev = dev_get_drvdata(dev);
456 struct stmmac_priv *priv = netdev_priv(ndev);
457 struct socfpga_dwmac *dwmac_priv = get_stmmac_bsp_priv(dev);
458
459 dwmac_priv->ops->set_phy_mode(priv->plat->bsp_priv);
460
461 /* Before the enet controller is suspended, the phy is suspended.
462 * This causes the phy clock to be gated. The enet controller is
463 * resumed before the phy, so the clock is still gated "off" when
464 * the enet controller is resumed. This code makes sure the phy
465 * is "resumed" before reinitializing the enet controller since
466 * the enet controller depends on an active phy clock to complete
467 * a DMA reset. A DMA reset will "time out" if executed
468 * with no phy clock input on the Synopsys enet controller.
469 * Verified through Synopsys Case #8000711656.
470 *
471 * Note that the phy clock is also gated when the phy is isolated.
472 * Phy "suspend" and "isolate" controls are located in phy basic
473 * control register 0, and can be modified by the phy driver
474 * framework.
475 */
476 if (ndev->phydev)
477 phy_resume(ndev->phydev);
478
479 return stmmac_resume(dev);
480 }
481 #endif /* CONFIG_PM_SLEEP */
482
483 static SIMPLE_DEV_PM_OPS(socfpga_dwmac_pm_ops, stmmac_suspend,
484 socfpga_dwmac_resume);
485
486 static const struct socfpga_dwmac_ops socfpga_gen5_ops = {
487 .set_phy_mode = socfpga_gen5_set_phy_mode,
488 };
489
490 static const struct socfpga_dwmac_ops socfpga_gen10_ops = {
491 .set_phy_mode = socfpga_gen10_set_phy_mode,
492 };
493
494 static const struct of_device_id socfpga_dwmac_match[] = {
495 { .compatible = "altr,socfpga-stmmac", .data = &socfpga_gen5_ops },
496 { .compatible = "altr,socfpga-stmmac-a10-s10", .data = &socfpga_gen10_ops },
497 { }
498 };
499 MODULE_DEVICE_TABLE(of, socfpga_dwmac_match);
500
501 static struct platform_driver socfpga_dwmac_driver = {
502 .probe = socfpga_dwmac_probe,
503 .remove = stmmac_pltfr_remove,
504 .driver = {
505 .name = "socfpga-dwmac",
506 .pm = &socfpga_dwmac_pm_ops,
507 .of_match_table = socfpga_dwmac_match,
508 },
509 };
510 module_platform_driver(socfpga_dwmac_driver);
511
512 MODULE_LICENSE("GPL v2");
513