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19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/delay.h>
22#include <linux/interrupt.h>
23#include <linux/platform_device.h>
24#include <linux/platform_data/b53.h>
25#include <linux/of.h>
26
27#include "b53_priv.h"
28#include "b53_serdes.h"
29
30
31#define B53_SRAB_CMDSTAT 0x2c
32#define B53_SRAB_CMDSTAT_RST BIT(2)
33#define B53_SRAB_CMDSTAT_WRITE BIT(1)
34#define B53_SRAB_CMDSTAT_GORDYN BIT(0)
35#define B53_SRAB_CMDSTAT_PAGE 24
36#define B53_SRAB_CMDSTAT_REG 16
37
38
39#define B53_SRAB_WD_H 0x30
40
41
42#define B53_SRAB_WD_L 0x34
43
44
45#define B53_SRAB_RD_H 0x38
46
47
48#define B53_SRAB_RD_L 0x3c
49
50
51#define B53_SRAB_CTRLS 0x40
52#define B53_SRAB_CTRLS_HOST_INTR BIT(1)
53#define B53_SRAB_CTRLS_RCAREQ BIT(3)
54#define B53_SRAB_CTRLS_RCAGNT BIT(4)
55#define B53_SRAB_CTRLS_SW_INIT_DONE BIT(6)
56
57
58#define B53_SRAB_INTR 0x44
59#define B53_SRAB_INTR_P(x) BIT(x)
60#define B53_SRAB_SWITCH_PHY BIT(8)
61#define B53_SRAB_1588_SYNC BIT(9)
62#define B53_SRAB_IMP1_SLEEP_TIMER BIT(10)
63#define B53_SRAB_P7_SLEEP_TIMER BIT(11)
64#define B53_SRAB_IMP0_SLEEP_TIMER BIT(12)
65
66
67#define B53_MUX_CONFIG_P5 0x00
68#define MUX_CONFIG_SGMII 0
69#define MUX_CONFIG_MII_LITE 1
70#define MUX_CONFIG_RGMII 2
71#define MUX_CONFIG_GMII 3
72#define MUX_CONFIG_GPHY 4
73#define MUX_CONFIG_INTERNAL 5
74#define MUX_CONFIG_MASK 0x7
75#define B53_MUX_CONFIG_P4 0x04
76
77struct b53_srab_port_priv {
78 int irq;
79 bool irq_enabled;
80 struct b53_device *dev;
81 unsigned int num;
82 phy_interface_t mode;
83};
84
85struct b53_srab_priv {
86 void __iomem *regs;
87 void __iomem *mux_config;
88 struct b53_srab_port_priv port_intrs[B53_N_PORTS];
89};
90
91static int b53_srab_request_grant(struct b53_device *dev)
92{
93 struct b53_srab_priv *priv = dev->priv;
94 u8 __iomem *regs = priv->regs;
95 u32 ctrls;
96 int i;
97
98 ctrls = readl(regs + B53_SRAB_CTRLS);
99 ctrls |= B53_SRAB_CTRLS_RCAREQ;
100 writel(ctrls, regs + B53_SRAB_CTRLS);
101
102 for (i = 0; i < 20; i++) {
103 ctrls = readl(regs + B53_SRAB_CTRLS);
104 if (ctrls & B53_SRAB_CTRLS_RCAGNT)
105 break;
106 usleep_range(10, 100);
107 }
108 if (WARN_ON(i == 5))
109 return -EIO;
110
111 return 0;
112}
113
114static void b53_srab_release_grant(struct b53_device *dev)
115{
116 struct b53_srab_priv *priv = dev->priv;
117 u8 __iomem *regs = priv->regs;
118 u32 ctrls;
119
120 ctrls = readl(regs + B53_SRAB_CTRLS);
121 ctrls &= ~B53_SRAB_CTRLS_RCAREQ;
122 writel(ctrls, regs + B53_SRAB_CTRLS);
123}
124
125static int b53_srab_op(struct b53_device *dev, u8 page, u8 reg, u32 op)
126{
127 struct b53_srab_priv *priv = dev->priv;
128 u8 __iomem *regs = priv->regs;
129 int i;
130 u32 cmdstat;
131
132
133 cmdstat = (page << B53_SRAB_CMDSTAT_PAGE) |
134 (reg << B53_SRAB_CMDSTAT_REG) |
135 B53_SRAB_CMDSTAT_GORDYN |
136 op;
137 writel(cmdstat, regs + B53_SRAB_CMDSTAT);
138
139
140 for (i = 0; i < 5; ++i) {
141 cmdstat = readl(regs + B53_SRAB_CMDSTAT);
142 if (!(cmdstat & B53_SRAB_CMDSTAT_GORDYN))
143 break;
144 usleep_range(10, 100);
145 }
146
147 if (WARN_ON(i == 5))
148 return -EIO;
149
150 return 0;
151}
152
153static int b53_srab_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val)
154{
155 struct b53_srab_priv *priv = dev->priv;
156 u8 __iomem *regs = priv->regs;
157 int ret = 0;
158
159 ret = b53_srab_request_grant(dev);
160 if (ret)
161 goto err;
162
163 ret = b53_srab_op(dev, page, reg, 0);
164 if (ret)
165 goto err;
166
167 *val = readl(regs + B53_SRAB_RD_L) & 0xff;
168
169err:
170 b53_srab_release_grant(dev);
171
172 return ret;
173}
174
175static int b53_srab_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val)
176{
177 struct b53_srab_priv *priv = dev->priv;
178 u8 __iomem *regs = priv->regs;
179 int ret = 0;
180
181 ret = b53_srab_request_grant(dev);
182 if (ret)
183 goto err;
184
185 ret = b53_srab_op(dev, page, reg, 0);
186 if (ret)
187 goto err;
188
189 *val = readl(regs + B53_SRAB_RD_L) & 0xffff;
190
191err:
192 b53_srab_release_grant(dev);
193
194 return ret;
195}
196
197static int b53_srab_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val)
198{
199 struct b53_srab_priv *priv = dev->priv;
200 u8 __iomem *regs = priv->regs;
201 int ret = 0;
202
203 ret = b53_srab_request_grant(dev);
204 if (ret)
205 goto err;
206
207 ret = b53_srab_op(dev, page, reg, 0);
208 if (ret)
209 goto err;
210
211 *val = readl(regs + B53_SRAB_RD_L);
212
213err:
214 b53_srab_release_grant(dev);
215
216 return ret;
217}
218
219static int b53_srab_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val)
220{
221 struct b53_srab_priv *priv = dev->priv;
222 u8 __iomem *regs = priv->regs;
223 int ret = 0;
224
225 ret = b53_srab_request_grant(dev);
226 if (ret)
227 goto err;
228
229 ret = b53_srab_op(dev, page, reg, 0);
230 if (ret)
231 goto err;
232
233 *val = readl(regs + B53_SRAB_RD_L);
234 *val += ((u64)readl(regs + B53_SRAB_RD_H) & 0xffff) << 32;
235
236err:
237 b53_srab_release_grant(dev);
238
239 return ret;
240}
241
242static int b53_srab_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val)
243{
244 struct b53_srab_priv *priv = dev->priv;
245 u8 __iomem *regs = priv->regs;
246 int ret = 0;
247
248 ret = b53_srab_request_grant(dev);
249 if (ret)
250 goto err;
251
252 ret = b53_srab_op(dev, page, reg, 0);
253 if (ret)
254 goto err;
255
256 *val = readl(regs + B53_SRAB_RD_L);
257 *val += (u64)readl(regs + B53_SRAB_RD_H) << 32;
258
259err:
260 b53_srab_release_grant(dev);
261
262 return ret;
263}
264
265static int b53_srab_write8(struct b53_device *dev, u8 page, u8 reg, u8 value)
266{
267 struct b53_srab_priv *priv = dev->priv;
268 u8 __iomem *regs = priv->regs;
269 int ret = 0;
270
271 ret = b53_srab_request_grant(dev);
272 if (ret)
273 goto err;
274
275 writel(value, regs + B53_SRAB_WD_L);
276
277 ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE);
278
279err:
280 b53_srab_release_grant(dev);
281
282 return ret;
283}
284
285static int b53_srab_write16(struct b53_device *dev, u8 page, u8 reg,
286 u16 value)
287{
288 struct b53_srab_priv *priv = dev->priv;
289 u8 __iomem *regs = priv->regs;
290 int ret = 0;
291
292 ret = b53_srab_request_grant(dev);
293 if (ret)
294 goto err;
295
296 writel(value, regs + B53_SRAB_WD_L);
297
298 ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE);
299
300err:
301 b53_srab_release_grant(dev);
302
303 return ret;
304}
305
306static int b53_srab_write32(struct b53_device *dev, u8 page, u8 reg,
307 u32 value)
308{
309 struct b53_srab_priv *priv = dev->priv;
310 u8 __iomem *regs = priv->regs;
311 int ret = 0;
312
313 ret = b53_srab_request_grant(dev);
314 if (ret)
315 goto err;
316
317 writel(value, regs + B53_SRAB_WD_L);
318
319 ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE);
320
321err:
322 b53_srab_release_grant(dev);
323
324 return ret;
325}
326
327static int b53_srab_write48(struct b53_device *dev, u8 page, u8 reg,
328 u64 value)
329{
330 struct b53_srab_priv *priv = dev->priv;
331 u8 __iomem *regs = priv->regs;
332 int ret = 0;
333
334 ret = b53_srab_request_grant(dev);
335 if (ret)
336 goto err;
337
338 writel((u32)value, regs + B53_SRAB_WD_L);
339 writel((u16)(value >> 32), regs + B53_SRAB_WD_H);
340
341 ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE);
342
343err:
344 b53_srab_release_grant(dev);
345
346 return ret;
347}
348
349static int b53_srab_write64(struct b53_device *dev, u8 page, u8 reg,
350 u64 value)
351{
352 struct b53_srab_priv *priv = dev->priv;
353 u8 __iomem *regs = priv->regs;
354 int ret = 0;
355
356 ret = b53_srab_request_grant(dev);
357 if (ret)
358 goto err;
359
360 writel((u32)value, regs + B53_SRAB_WD_L);
361 writel((u32)(value >> 32), regs + B53_SRAB_WD_H);
362
363 ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE);
364
365err:
366 b53_srab_release_grant(dev);
367
368 return ret;
369}
370
371static irqreturn_t b53_srab_port_thread(int irq, void *dev_id)
372{
373 struct b53_srab_port_priv *port = dev_id;
374 struct b53_device *dev = port->dev;
375
376 if (port->mode == PHY_INTERFACE_MODE_SGMII)
377 b53_port_event(dev->ds, port->num);
378
379 return IRQ_HANDLED;
380}
381
382static irqreturn_t b53_srab_port_isr(int irq, void *dev_id)
383{
384 struct b53_srab_port_priv *port = dev_id;
385 struct b53_device *dev = port->dev;
386 struct b53_srab_priv *priv = dev->priv;
387
388
389 writel(BIT(port->num), priv->regs + B53_SRAB_INTR);
390
391 return IRQ_WAKE_THREAD;
392}
393
394#if IS_ENABLED(CONFIG_B53_SERDES)
395static u8 b53_srab_serdes_map_lane(struct b53_device *dev, int port)
396{
397 struct b53_srab_priv *priv = dev->priv;
398 struct b53_srab_port_priv *p = &priv->port_intrs[port];
399
400 if (p->mode != PHY_INTERFACE_MODE_SGMII)
401 return B53_INVALID_LANE;
402
403 switch (port) {
404 case 5:
405 return 0;
406 case 4:
407 return 1;
408 default:
409 return B53_INVALID_LANE;
410 }
411}
412#endif
413
414static int b53_srab_irq_enable(struct b53_device *dev, int port)
415{
416 struct b53_srab_priv *priv = dev->priv;
417 struct b53_srab_port_priv *p = &priv->port_intrs[port];
418 int ret = 0;
419
420
421
422
423 if (p->irq == -ENXIO)
424 return ret;
425
426 ret = request_threaded_irq(p->irq, b53_srab_port_isr,
427 b53_srab_port_thread, 0,
428 dev_name(dev->dev), p);
429 if (!ret)
430 p->irq_enabled = true;
431
432 return ret;
433}
434
435static void b53_srab_irq_disable(struct b53_device *dev, int port)
436{
437 struct b53_srab_priv *priv = dev->priv;
438 struct b53_srab_port_priv *p = &priv->port_intrs[port];
439
440 if (p->irq_enabled) {
441 free_irq(p->irq, p);
442 p->irq_enabled = false;
443 }
444}
445
446static const struct b53_io_ops b53_srab_ops = {
447 .read8 = b53_srab_read8,
448 .read16 = b53_srab_read16,
449 .read32 = b53_srab_read32,
450 .read48 = b53_srab_read48,
451 .read64 = b53_srab_read64,
452 .write8 = b53_srab_write8,
453 .write16 = b53_srab_write16,
454 .write32 = b53_srab_write32,
455 .write48 = b53_srab_write48,
456 .write64 = b53_srab_write64,
457 .irq_enable = b53_srab_irq_enable,
458 .irq_disable = b53_srab_irq_disable,
459#if IS_ENABLED(CONFIG_B53_SERDES)
460 .serdes_map_lane = b53_srab_serdes_map_lane,
461 .serdes_link_state = b53_serdes_link_state,
462 .serdes_config = b53_serdes_config,
463 .serdes_an_restart = b53_serdes_an_restart,
464 .serdes_link_set = b53_serdes_link_set,
465 .serdes_phylink_validate = b53_serdes_phylink_validate,
466#endif
467};
468
469static const struct of_device_id b53_srab_of_match[] = {
470 { .compatible = "brcm,bcm53010-srab" },
471 { .compatible = "brcm,bcm53011-srab" },
472 { .compatible = "brcm,bcm53012-srab" },
473 { .compatible = "brcm,bcm53018-srab" },
474 { .compatible = "brcm,bcm53019-srab" },
475 { .compatible = "brcm,bcm5301x-srab" },
476 { .compatible = "brcm,bcm11360-srab", .data = (void *)BCM583XX_DEVICE_ID },
477 { .compatible = "brcm,bcm58522-srab", .data = (void *)BCM58XX_DEVICE_ID },
478 { .compatible = "brcm,bcm58525-srab", .data = (void *)BCM58XX_DEVICE_ID },
479 { .compatible = "brcm,bcm58535-srab", .data = (void *)BCM58XX_DEVICE_ID },
480 { .compatible = "brcm,bcm58622-srab", .data = (void *)BCM58XX_DEVICE_ID },
481 { .compatible = "brcm,bcm58623-srab", .data = (void *)BCM58XX_DEVICE_ID },
482 { .compatible = "brcm,bcm58625-srab", .data = (void *)BCM58XX_DEVICE_ID },
483 { .compatible = "brcm,bcm88312-srab", .data = (void *)BCM58XX_DEVICE_ID },
484 { .compatible = "brcm,cygnus-srab", .data = (void *)BCM583XX_DEVICE_ID },
485 { .compatible = "brcm,nsp-srab", .data = (void *)BCM58XX_DEVICE_ID },
486 { .compatible = "brcm,omega-srab", .data = (void *)BCM583XX_DEVICE_ID },
487 { },
488};
489MODULE_DEVICE_TABLE(of, b53_srab_of_match);
490
491static void b53_srab_intr_set(struct b53_srab_priv *priv, bool set)
492{
493 u32 reg;
494
495 reg = readl(priv->regs + B53_SRAB_CTRLS);
496 if (set)
497 reg |= B53_SRAB_CTRLS_HOST_INTR;
498 else
499 reg &= ~B53_SRAB_CTRLS_HOST_INTR;
500 writel(reg, priv->regs + B53_SRAB_CTRLS);
501}
502
503static void b53_srab_prepare_irq(struct platform_device *pdev)
504{
505 struct b53_device *dev = platform_get_drvdata(pdev);
506 struct b53_srab_priv *priv = dev->priv;
507 struct b53_srab_port_priv *port;
508 unsigned int i;
509 char *name;
510
511
512 writel(0xffffffff, priv->regs + B53_SRAB_INTR);
513
514 for (i = 0; i < B53_N_PORTS; i++) {
515 port = &priv->port_intrs[i];
516
517
518 if (i == 6)
519 continue;
520
521 name = kasprintf(GFP_KERNEL, "link_state_p%d", i);
522 if (!name)
523 return;
524
525 port->num = i;
526 port->dev = dev;
527 port->irq = platform_get_irq_byname_optional(pdev, name);
528 kfree(name);
529 }
530
531 b53_srab_intr_set(priv, true);
532}
533
534static void b53_srab_mux_init(struct platform_device *pdev)
535{
536 struct b53_device *dev = platform_get_drvdata(pdev);
537 struct b53_srab_priv *priv = dev->priv;
538 struct b53_srab_port_priv *p;
539 unsigned int port;
540 u32 reg, off = 0;
541 int ret;
542
543 if (dev->pdata && dev->pdata->chip_id != BCM58XX_DEVICE_ID)
544 return;
545
546 priv->mux_config = devm_platform_ioremap_resource(pdev, 1);
547 if (IS_ERR(priv->mux_config))
548 return;
549
550
551
552
553 for (port = 5; port > 3; port--, off += 4) {
554 p = &priv->port_intrs[port];
555
556 reg = readl(priv->mux_config + B53_MUX_CONFIG_P5 + off);
557 switch (reg & MUX_CONFIG_MASK) {
558 case MUX_CONFIG_SGMII:
559 p->mode = PHY_INTERFACE_MODE_SGMII;
560 ret = b53_serdes_init(dev, port);
561 if (ret)
562 continue;
563 break;
564 case MUX_CONFIG_MII_LITE:
565 p->mode = PHY_INTERFACE_MODE_MII;
566 break;
567 case MUX_CONFIG_GMII:
568 p->mode = PHY_INTERFACE_MODE_GMII;
569 break;
570 case MUX_CONFIG_RGMII:
571 p->mode = PHY_INTERFACE_MODE_RGMII;
572 break;
573 case MUX_CONFIG_INTERNAL:
574 p->mode = PHY_INTERFACE_MODE_INTERNAL;
575 break;
576 default:
577 p->mode = PHY_INTERFACE_MODE_NA;
578 break;
579 }
580
581 if (p->mode != PHY_INTERFACE_MODE_NA)
582 dev_info(&pdev->dev, "Port %d mode: %s\n",
583 port, phy_modes(p->mode));
584 }
585}
586
587static int b53_srab_probe(struct platform_device *pdev)
588{
589 struct b53_platform_data *pdata = pdev->dev.platform_data;
590 struct device_node *dn = pdev->dev.of_node;
591 const struct of_device_id *of_id = NULL;
592 struct b53_srab_priv *priv;
593 struct b53_device *dev;
594
595 if (dn)
596 of_id = of_match_node(b53_srab_of_match, dn);
597
598 if (of_id) {
599 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
600 if (!pdata)
601 return -ENOMEM;
602
603 pdata->chip_id = (u32)(unsigned long)of_id->data;
604 }
605
606 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
607 if (!priv)
608 return -ENOMEM;
609
610 priv->regs = devm_platform_ioremap_resource(pdev, 0);
611 if (IS_ERR(priv->regs))
612 return PTR_ERR(priv->regs);
613
614 dev = b53_switch_alloc(&pdev->dev, &b53_srab_ops, priv);
615 if (!dev)
616 return -ENOMEM;
617
618 if (pdata)
619 dev->pdata = pdata;
620
621 platform_set_drvdata(pdev, dev);
622
623 b53_srab_prepare_irq(pdev);
624 b53_srab_mux_init(pdev);
625
626 return b53_switch_register(dev);
627}
628
629static int b53_srab_remove(struct platform_device *pdev)
630{
631 struct b53_device *dev = platform_get_drvdata(pdev);
632 struct b53_srab_priv *priv = dev->priv;
633
634 b53_srab_intr_set(priv, false);
635 if (dev)
636 b53_switch_remove(dev);
637
638 return 0;
639}
640
641static struct platform_driver b53_srab_driver = {
642 .probe = b53_srab_probe,
643 .remove = b53_srab_remove,
644 .driver = {
645 .name = "b53-srab-switch",
646 .of_match_table = b53_srab_of_match,
647 },
648};
649
650module_platform_driver(b53_srab_driver);
651MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>");
652MODULE_DESCRIPTION("B53 Switch Register Access Bridge Registers (SRAB) access driver");
653MODULE_LICENSE("Dual BSD/GPL");
654
