1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2022 Schneider Electric
4 *
5 * Clément Léger <clement.leger@bootlin.com>
6 */
7
8#include <linux/clk.h>
9#include <linux/device.h>
10#include <linux/mdio.h>
11#include <linux/of.h>
12#include <linux/of_platform.h>
13#include <linux/pcs-rzn1-miic.h>
14#include <linux/phylink.h>
15#include <linux/platform_device.h>
16#include <linux/pm_runtime.h>
17#include <dt-bindings/net/pcs-rzn1-miic.h>
18
19#define MIIC_PRCMD 0x0
20#define MIIC_ESID_CODE 0x4
21
22#define MIIC_MODCTRL 0x20
23#define MIIC_MODCTRL_SW_MODE GENMASK(4, 0)
24
25#define MIIC_CONVCTRL(port) (0x100 + (port) * 4)
26
27#define MIIC_CONVCTRL_CONV_SPEED GENMASK(1, 0)
28#define CONV_MODE_10MBPS 0
29#define CONV_MODE_100MBPS 1
30#define CONV_MODE_1000MBPS 2
31
32#define MIIC_CONVCTRL_CONV_MODE GENMASK(3, 2)
33#define CONV_MODE_MII 0
34#define CONV_MODE_RMII 1
35#define CONV_MODE_RGMII 2
36
37#define MIIC_CONVCTRL_FULLD BIT(8)
38#define MIIC_CONVCTRL_RGMII_LINK BIT(12)
39#define MIIC_CONVCTRL_RGMII_DUPLEX BIT(13)
40#define MIIC_CONVCTRL_RGMII_SPEED GENMASK(15, 14)
41
42#define MIIC_CONVRST 0x114
43#define MIIC_CONVRST_PHYIF_RST(port) BIT(port)
44#define MIIC_CONVRST_PHYIF_RST_MASK GENMASK(4, 0)
45
46#define MIIC_SWCTRL 0x304
47#define MIIC_SWDUPC 0x308
48
49#define MIIC_MAX_NR_PORTS 5
50
51#define MIIC_MODCTRL_CONF_CONV_NUM 6
52#define MIIC_MODCTRL_CONF_NONE -1
53
54/**
55 * struct modctrl_match - Matching table entry for convctrl configuration
56 * See section 8.2.1 of manual.
57 * @mode_cfg: Configuration value for convctrl
58 * @conv: Configuration of ethernet port muxes. First index is SWITCH_PORTIN,
59 * then index 1 - 5 are CONV1 - CONV5.
60 */
61struct modctrl_match {
62 u32 mode_cfg;
63 u8 conv[MIIC_MODCTRL_CONF_CONV_NUM];
64};
65
66static struct modctrl_match modctrl_match_table[] = {
67 {0x0, {MIIC_RTOS_PORT, MIIC_GMAC1_PORT, MIIC_SWITCH_PORTD,
68 MIIC_SWITCH_PORTC, MIIC_SERCOS_PORTB, MIIC_SERCOS_PORTA}},
69 {0x1, {MIIC_RTOS_PORT, MIIC_GMAC1_PORT, MIIC_SWITCH_PORTD,
70 MIIC_SWITCH_PORTC, MIIC_ETHERCAT_PORTB, MIIC_ETHERCAT_PORTA}},
71 {0x2, {MIIC_RTOS_PORT, MIIC_GMAC1_PORT, MIIC_SWITCH_PORTD,
72 MIIC_ETHERCAT_PORTC, MIIC_ETHERCAT_PORTB, MIIC_ETHERCAT_PORTA}},
73 {0x3, {MIIC_RTOS_PORT, MIIC_GMAC1_PORT, MIIC_SWITCH_PORTD,
74 MIIC_SWITCH_PORTC, MIIC_SWITCH_PORTB, MIIC_SWITCH_PORTA}},
75
76 {0x8, {MIIC_RTOS_PORT, MIIC_GMAC1_PORT, MIIC_SWITCH_PORTD,
77 MIIC_SWITCH_PORTC, MIIC_SERCOS_PORTB, MIIC_SERCOS_PORTA}},
78 {0x9, {MIIC_RTOS_PORT, MIIC_GMAC1_PORT, MIIC_SWITCH_PORTD,
79 MIIC_SWITCH_PORTC, MIIC_ETHERCAT_PORTB, MIIC_ETHERCAT_PORTA}},
80 {0xA, {MIIC_RTOS_PORT, MIIC_GMAC1_PORT, MIIC_SWITCH_PORTD,
81 MIIC_ETHERCAT_PORTC, MIIC_ETHERCAT_PORTB, MIIC_ETHERCAT_PORTA}},
82 {0xB, {MIIC_RTOS_PORT, MIIC_GMAC1_PORT, MIIC_SWITCH_PORTD,
83 MIIC_SWITCH_PORTC, MIIC_SWITCH_PORTB, MIIC_SWITCH_PORTA}},
84
85 {0x10, {MIIC_GMAC2_PORT, MIIC_GMAC1_PORT, MIIC_SWITCH_PORTD,
86 MIIC_SWITCH_PORTC, MIIC_SERCOS_PORTB, MIIC_SERCOS_PORTA}},
87 {0x11, {MIIC_GMAC2_PORT, MIIC_GMAC1_PORT, MIIC_SWITCH_PORTD,
88 MIIC_SWITCH_PORTC, MIIC_ETHERCAT_PORTB, MIIC_ETHERCAT_PORTA}},
89 {0x12, {MIIC_GMAC2_PORT, MIIC_GMAC1_PORT, MIIC_SWITCH_PORTD,
90 MIIC_ETHERCAT_PORTC, MIIC_ETHERCAT_PORTB, MIIC_ETHERCAT_PORTA}},
91 {0x13, {MIIC_GMAC2_PORT, MIIC_GMAC1_PORT, MIIC_SWITCH_PORTD,
92 MIIC_SWITCH_PORTC, MIIC_SWITCH_PORTB, MIIC_SWITCH_PORTA}}
93};
94
95static const char * const conf_to_string[] = {
96 [MIIC_GMAC1_PORT] = "GMAC1_PORT",
97 [MIIC_GMAC2_PORT] = "GMAC2_PORT",
98 [MIIC_RTOS_PORT] = "RTOS_PORT",
99 [MIIC_SERCOS_PORTA] = "SERCOS_PORTA",
100 [MIIC_SERCOS_PORTB] = "SERCOS_PORTB",
101 [MIIC_ETHERCAT_PORTA] = "ETHERCAT_PORTA",
102 [MIIC_ETHERCAT_PORTB] = "ETHERCAT_PORTB",
103 [MIIC_ETHERCAT_PORTC] = "ETHERCAT_PORTC",
104 [MIIC_SWITCH_PORTA] = "SWITCH_PORTA",
105 [MIIC_SWITCH_PORTB] = "SWITCH_PORTB",
106 [MIIC_SWITCH_PORTC] = "SWITCH_PORTC",
107 [MIIC_SWITCH_PORTD] = "SWITCH_PORTD",
108 [MIIC_HSR_PORTA] = "HSR_PORTA",
109 [MIIC_HSR_PORTB] = "HSR_PORTB",
110};
111
112static const char *index_to_string[MIIC_MODCTRL_CONF_CONV_NUM] = {
113 "SWITCH_PORTIN",
114 "CONV1",
115 "CONV2",
116 "CONV3",
117 "CONV4",
118 "CONV5",
119};
120
121/**
122 * struct miic - MII converter structure
123 * @base: base address of the MII converter
124 * @dev: Device associated to the MII converter
125 * @lock: Lock used for read-modify-write access
126 */
127struct miic {
128 void __iomem *base;
129 struct device *dev;
130 spinlock_t lock;
131};
132
133/**
134 * struct miic_port - Per port MII converter struct
135 * @miic: backiling to MII converter structure
136 * @pcs: PCS structure associated to the port
137 * @port: port number
138 * @interface: interface mode of the port
139 */
140struct miic_port {
141 struct miic *miic;
142 struct phylink_pcs pcs;
143 int port;
144 phy_interface_t interface;
145};
146
147static struct miic_port *phylink_pcs_to_miic_port(struct phylink_pcs *pcs)
148{
149 return container_of(pcs, struct miic_port, pcs);
150}
151
152static void miic_reg_writel(struct miic *miic, int offset, u32 value)
153{
154 writel(val: value, addr: miic->base + offset);
155}
156
157static u32 miic_reg_readl(struct miic *miic, int offset)
158{
159 return readl(addr: miic->base + offset);
160}
161
162static void miic_reg_rmw(struct miic *miic, int offset, u32 mask, u32 val)
163{
164 u32 reg;
165
166 spin_lock(lock: &miic->lock);
167
168 reg = miic_reg_readl(miic, offset);
169 reg &= ~mask;
170 reg |= val;
171 miic_reg_writel(miic, offset, value: reg);
172
173 spin_unlock(lock: &miic->lock);
174}
175
176static void miic_converter_enable(struct miic *miic, int port, int enable)
177{
178 u32 val = 0;
179
180 if (enable)
181 val = MIIC_CONVRST_PHYIF_RST(port);
182
183 miic_reg_rmw(miic, MIIC_CONVRST, MIIC_CONVRST_PHYIF_RST(port), val);
184}
185
186static int miic_config(struct phylink_pcs *pcs, unsigned int neg_mode,
187 phy_interface_t interface,
188 const unsigned long *advertising, bool permit)
189{
190 struct miic_port *miic_port = phylink_pcs_to_miic_port(pcs);
191 struct miic *miic = miic_port->miic;
192 u32 speed, conv_mode, val, mask;
193 int port = miic_port->port;
194
195 switch (interface) {
196 case PHY_INTERFACE_MODE_RMII:
197 conv_mode = CONV_MODE_RMII;
198 speed = CONV_MODE_100MBPS;
199 break;
200 case PHY_INTERFACE_MODE_RGMII:
201 case PHY_INTERFACE_MODE_RGMII_ID:
202 case PHY_INTERFACE_MODE_RGMII_TXID:
203 case PHY_INTERFACE_MODE_RGMII_RXID:
204 conv_mode = CONV_MODE_RGMII;
205 speed = CONV_MODE_1000MBPS;
206 break;
207 case PHY_INTERFACE_MODE_MII:
208 conv_mode = CONV_MODE_MII;
209 /* When in MII mode, speed should be set to 0 (which is actually
210 * CONV_MODE_10MBPS)
211 */
212 speed = CONV_MODE_10MBPS;
213 break;
214 default:
215 return -EOPNOTSUPP;
216 }
217
218 val = FIELD_PREP(MIIC_CONVCTRL_CONV_MODE, conv_mode);
219 mask = MIIC_CONVCTRL_CONV_MODE;
220
221 /* Update speed only if we are going to change the interface because
222 * the link might already be up and it would break it if the speed is
223 * changed.
224 */
225 if (interface != miic_port->interface) {
226 val |= FIELD_PREP(MIIC_CONVCTRL_CONV_SPEED, speed);
227 mask |= MIIC_CONVCTRL_CONV_SPEED;
228 miic_port->interface = interface;
229 }
230
231 miic_reg_rmw(miic, MIIC_CONVCTRL(port), mask, val);
232 miic_converter_enable(miic, port: miic_port->port, enable: 1);
233
234 return 0;
235}
236
237static void miic_link_up(struct phylink_pcs *pcs, unsigned int neg_mode,
238 phy_interface_t interface, int speed, int duplex)
239{
240 struct miic_port *miic_port = phylink_pcs_to_miic_port(pcs);
241 struct miic *miic = miic_port->miic;
242 u32 conv_speed = 0, val = 0;
243 int port = miic_port->port;
244
245 if (duplex == DUPLEX_FULL)
246 val |= MIIC_CONVCTRL_FULLD;
247
248 /* No speed in MII through-mode */
249 if (interface != PHY_INTERFACE_MODE_MII) {
250 switch (speed) {
251 case SPEED_1000:
252 conv_speed = CONV_MODE_1000MBPS;
253 break;
254 case SPEED_100:
255 conv_speed = CONV_MODE_100MBPS;
256 break;
257 case SPEED_10:
258 conv_speed = CONV_MODE_10MBPS;
259 break;
260 default:
261 return;
262 }
263 }
264
265 val |= FIELD_PREP(MIIC_CONVCTRL_CONV_SPEED, conv_speed);
266
267 miic_reg_rmw(miic, MIIC_CONVCTRL(port),
268 mask: (MIIC_CONVCTRL_CONV_SPEED | MIIC_CONVCTRL_FULLD), val);
269}
270
271static int miic_validate(struct phylink_pcs *pcs, unsigned long *supported,
272 const struct phylink_link_state *state)
273{
274 if (phy_interface_mode_is_rgmii(mode: state->interface) ||
275 state->interface == PHY_INTERFACE_MODE_RMII ||
276 state->interface == PHY_INTERFACE_MODE_MII)
277 return 1;
278
279 return -EINVAL;
280}
281
282static const struct phylink_pcs_ops miic_phylink_ops = {
283 .pcs_validate = miic_validate,
284 .pcs_config = miic_config,
285 .pcs_link_up = miic_link_up,
286};
287
288struct phylink_pcs *miic_create(struct device *dev, struct device_node *np)
289{
290 struct platform_device *pdev;
291 struct miic_port *miic_port;
292 struct device_node *pcs_np;
293 struct miic *miic;
294 u32 port;
295
296 if (!of_device_is_available(device: np))
297 return ERR_PTR(error: -ENODEV);
298
299 if (of_property_read_u32(np, propname: "reg", out_value: &port))
300 return ERR_PTR(error: -EINVAL);
301
302 if (port > MIIC_MAX_NR_PORTS || port < 1)
303 return ERR_PTR(error: -EINVAL);
304
305 /* The PCS pdev is attached to the parent node */
306 pcs_np = of_get_parent(node: np);
307 if (!pcs_np)
308 return ERR_PTR(error: -ENODEV);
309
310 if (!of_device_is_available(device: pcs_np)) {
311 of_node_put(node: pcs_np);
312 return ERR_PTR(error: -ENODEV);
313 }
314
315 pdev = of_find_device_by_node(np: pcs_np);
316 of_node_put(node: pcs_np);
317 if (!pdev || !platform_get_drvdata(pdev)) {
318 if (pdev)
319 put_device(dev: &pdev->dev);
320 return ERR_PTR(error: -EPROBE_DEFER);
321 }
322
323 miic_port = kzalloc(size: sizeof(*miic_port), GFP_KERNEL);
324 if (!miic_port) {
325 put_device(dev: &pdev->dev);
326 return ERR_PTR(error: -ENOMEM);
327 }
328
329 miic = platform_get_drvdata(pdev);
330 device_link_add(consumer: dev, supplier: miic->dev, DL_FLAG_AUTOREMOVE_CONSUMER);
331 put_device(dev: &pdev->dev);
332
333 miic_port->miic = miic;
334 miic_port->port = port - 1;
335 miic_port->pcs.ops = &miic_phylink_ops;
336 miic_port->pcs.neg_mode = true;
337
338 return &miic_port->pcs;
339}
340EXPORT_SYMBOL(miic_create);
341
342void miic_destroy(struct phylink_pcs *pcs)
343{
344 struct miic_port *miic_port = phylink_pcs_to_miic_port(pcs);
345
346 miic_converter_enable(miic: miic_port->miic, port: miic_port->port, enable: 0);
347 kfree(objp: miic_port);
348}
349EXPORT_SYMBOL(miic_destroy);
350
351static int miic_init_hw(struct miic *miic, u32 cfg_mode)
352{
353 int port;
354
355 /* Unlock write access to accessory registers (cf datasheet). If this
356 * is going to be used in conjunction with the Cortex-M3, this sequence
357 * will have to be moved in register write
358 */
359 miic_reg_writel(miic, MIIC_PRCMD, value: 0x00A5);
360 miic_reg_writel(miic, MIIC_PRCMD, value: 0x0001);
361 miic_reg_writel(miic, MIIC_PRCMD, value: 0xFFFE);
362 miic_reg_writel(miic, MIIC_PRCMD, value: 0x0001);
363
364 miic_reg_writel(miic, MIIC_MODCTRL,
365 FIELD_PREP(MIIC_MODCTRL_SW_MODE, cfg_mode));
366
367 for (port = 0; port < MIIC_MAX_NR_PORTS; port++) {
368 miic_converter_enable(miic, port, enable: 0);
369 /* Disable speed/duplex control from these registers, datasheet
370 * says switch registers should be used to setup switch port
371 * speed and duplex.
372 */
373 miic_reg_writel(miic, MIIC_SWCTRL, value: 0x0);
374 miic_reg_writel(miic, MIIC_SWDUPC, value: 0x0);
375 }
376
377 return 0;
378}
379
380static bool miic_modctrl_match(s8 table_val[MIIC_MODCTRL_CONF_CONV_NUM],
381 s8 dt_val[MIIC_MODCTRL_CONF_CONV_NUM])
382{
383 int i;
384
385 for (i = 0; i < MIIC_MODCTRL_CONF_CONV_NUM; i++) {
386 if (dt_val[i] == MIIC_MODCTRL_CONF_NONE)
387 continue;
388
389 if (dt_val[i] != table_val[i])
390 return false;
391 }
392
393 return true;
394}
395
396static void miic_dump_conf(struct device *dev,
397 s8 conf[MIIC_MODCTRL_CONF_CONV_NUM])
398{
399 const char *conf_name;
400 int i;
401
402 for (i = 0; i < MIIC_MODCTRL_CONF_CONV_NUM; i++) {
403 if (conf[i] != MIIC_MODCTRL_CONF_NONE)
404 conf_name = conf_to_string[conf[i]];
405 else
406 conf_name = "NONE";
407
408 dev_err(dev, "%s: %s\n", index_to_string[i], conf_name);
409 }
410}
411
412static int miic_match_dt_conf(struct device *dev,
413 s8 dt_val[MIIC_MODCTRL_CONF_CONV_NUM],
414 u32 *mode_cfg)
415{
416 struct modctrl_match *table_entry;
417 int i;
418
419 for (i = 0; i < ARRAY_SIZE(modctrl_match_table); i++) {
420 table_entry = &modctrl_match_table[i];
421
422 if (miic_modctrl_match(table_val: table_entry->conv, dt_val)) {
423 *mode_cfg = table_entry->mode_cfg;
424 return 0;
425 }
426 }
427
428 dev_err(dev, "Failed to apply requested configuration\n");
429 miic_dump_conf(dev, conf: dt_val);
430
431 return -EINVAL;
432}
433
434static int miic_parse_dt(struct device *dev, u32 *mode_cfg)
435{
436 s8 dt_val[MIIC_MODCTRL_CONF_CONV_NUM];
437 struct device_node *np = dev->of_node;
438 struct device_node *conv;
439 u32 conf;
440 int port;
441
442 memset(dt_val, MIIC_MODCTRL_CONF_NONE, sizeof(dt_val));
443
444 if (of_property_read_u32(np, propname: "renesas,miic-switch-portin", out_value: &conf) == 0)
445 dt_val[0] = conf;
446
447 for_each_child_of_node(np, conv) {
448 if (of_property_read_u32(np: conv, propname: "reg", out_value: &port))
449 continue;
450
451 if (!of_device_is_available(device: conv))
452 continue;
453
454 if (of_property_read_u32(np: conv, propname: "renesas,miic-input", out_value: &conf) == 0)
455 dt_val[port] = conf;
456 }
457
458 return miic_match_dt_conf(dev, dt_val, mode_cfg);
459}
460
461static int miic_probe(struct platform_device *pdev)
462{
463 struct device *dev = &pdev->dev;
464 struct miic *miic;
465 u32 mode_cfg;
466 int ret;
467
468 ret = miic_parse_dt(dev, mode_cfg: &mode_cfg);
469 if (ret < 0)
470 return ret;
471
472 miic = devm_kzalloc(dev, size: sizeof(*miic), GFP_KERNEL);
473 if (!miic)
474 return -ENOMEM;
475
476 spin_lock_init(&miic->lock);
477 miic->dev = dev;
478 miic->base = devm_platform_ioremap_resource(pdev, index: 0);
479 if (IS_ERR(ptr: miic->base))
480 return PTR_ERR(ptr: miic->base);
481
482 ret = devm_pm_runtime_enable(dev);
483 if (ret < 0)
484 return ret;
485
486 ret = pm_runtime_resume_and_get(dev);
487 if (ret < 0)
488 return ret;
489
490 ret = miic_init_hw(miic, cfg_mode: mode_cfg);
491 if (ret)
492 goto disable_runtime_pm;
493
494 /* miic_create() relies on that fact that data are attached to the
495 * platform device to determine if the driver is ready so this needs to
496 * be the last thing to be done after everything is initialized
497 * properly.
498 */
499 platform_set_drvdata(pdev, data: miic);
500
501 return 0;
502
503disable_runtime_pm:
504 pm_runtime_put(dev);
505
506 return ret;
507}
508
509static void miic_remove(struct platform_device *pdev)
510{
511 pm_runtime_put(dev: &pdev->dev);
512}
513
514static const struct of_device_id miic_of_mtable[] = {
515 { .compatible = "renesas,rzn1-miic" },
516 { /* sentinel */ },
517};
518MODULE_DEVICE_TABLE(of, miic_of_mtable);
519
520static struct platform_driver miic_driver = {
521 .driver = {
522 .name = "rzn1_miic",
523 .suppress_bind_attrs = true,
524 .of_match_table = miic_of_mtable,
525 },
526 .probe = miic_probe,
527 .remove_new = miic_remove,
528};
529module_platform_driver(miic_driver);
530
531MODULE_LICENSE("GPL");
532MODULE_DESCRIPTION("Renesas MII converter PCS driver");
533MODULE_AUTHOR("Clément Léger <clement.leger@bootlin.com>");
534

source code of linux/drivers/net/pcs/pcs-rzn1-miic.c