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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * phy-brcm-usb.c - Broadcom USB Phy Driver
4 *
5 * Copyright (C) 2015-2017 Broadcom
6 */
7
8#include <linux/clk.h>
9#include <linux/delay.h>
10#include <linux/err.h>
11#include <linux/io.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/phy/phy.h>
15#include <linux/platform_device.h>
16#include <linux/interrupt.h>
17#include <linux/soc/brcmstb/brcmstb.h>
18#include <dt-bindings/phy/phy.h>
19#include <linux/mfd/syscon.h>
20
21#include "phy-brcm-usb-init.h"
22
23static DEFINE_MUTEX(sysfs_lock);
24
25enum brcm_usb_phy_id {
26 BRCM_USB_PHY_2_0 = 0,
27 BRCM_USB_PHY_3_0,
28 BRCM_USB_PHY_ID_MAX
29};
30
31struct value_to_name_map {
32 int value;
33 const char *name;
34};
35
36struct match_chip_info {
37 void *init_func;
38 u8 required_regs[BRCM_REGS_MAX + 1];
39 u8 optional_reg;
40};
41
42static const struct value_to_name_map brcm_dr_mode_to_name[] = {
43 { USB_CTLR_MODE_HOST, "host" },
44 { USB_CTLR_MODE_DEVICE, "peripheral" },
45 { USB_CTLR_MODE_DRD, "drd" },
46 { USB_CTLR_MODE_TYPEC_PD, "typec-pd" }
47};
48
49static const struct value_to_name_map brcm_dual_mode_to_name[] = {
50 { 0, "host" },
51 { 1, "device" },
52 { 2, "auto" },
53};
54
55struct brcm_usb_phy {
56 struct phy *phy;
57 unsigned int id;
58 bool inited;
59};
60
61struct brcm_usb_phy_data {
62 struct brcm_usb_init_params ini;
63 bool has_eohci;
64 bool has_xhci;
65 struct clk *usb_20_clk;
66 struct clk *usb_30_clk;
67 struct clk *suspend_clk;
68 struct mutex mutex; /* serialize phy init */
69 int init_count;
70 int wake_irq;
71 struct brcm_usb_phy phys[BRCM_USB_PHY_ID_MAX];
72};
73
74static s8 *node_reg_names[BRCM_REGS_MAX] = {
75 "crtl", "xhci_ec", "xhci_gbl", "usb_phy", "usb_mdio", "bdc_ec"
76};
77
78static irqreturn_t brcm_usb_phy_wake_isr(int irq, void *dev_id)
79{
80 struct phy *gphy = dev_id;
81
82 pm_wakeup_event(&gphy->dev, 0);
83
84 return IRQ_HANDLED;
85}
86
87static int brcm_usb_phy_init(struct phy *gphy)
88{
89 struct brcm_usb_phy *phy = phy_get_drvdata(gphy);
90 struct brcm_usb_phy_data *priv =
91 container_of(phy, struct brcm_usb_phy_data, phys[phy->id]);
92
93 /*
94 * Use a lock to make sure a second caller waits until
95 * the base phy is inited before using it.
96 */
97 mutex_lock(&priv->mutex);
98 if (priv->init_count++ == 0) {
99 clk_prepare_enable(priv->usb_20_clk);
100 clk_prepare_enable(priv->usb_30_clk);
101 clk_prepare_enable(priv->suspend_clk);
102 brcm_usb_init_common(&priv->ini);
103 }
104 mutex_unlock(&priv->mutex);
105 if (phy->id == BRCM_USB_PHY_2_0)
106 brcm_usb_init_eohci(&priv->ini);
107 else if (phy->id == BRCM_USB_PHY_3_0)
108 brcm_usb_init_xhci(&priv->ini);
109 phy->inited = true;
110 dev_dbg(&gphy->dev, "INIT, id: %d, total: %d\n", phy->id,
111 priv->init_count);
112
113 return 0;
114}
115
116static int brcm_usb_phy_exit(struct phy *gphy)
117{
118 struct brcm_usb_phy *phy = phy_get_drvdata(gphy);
119 struct brcm_usb_phy_data *priv =
120 container_of(phy, struct brcm_usb_phy_data, phys[phy->id]);
121
122 dev_dbg(&gphy->dev, "EXIT\n");
123 if (phy->id == BRCM_USB_PHY_2_0)
124 brcm_usb_uninit_eohci(&priv->ini);
125 if (phy->id == BRCM_USB_PHY_3_0)
126 brcm_usb_uninit_xhci(&priv->ini);
127
128 /* If both xhci and eohci are gone, reset everything else */
129 mutex_lock(&priv->mutex);
130 if (--priv->init_count == 0) {
131 brcm_usb_uninit_common(&priv->ini);
132 clk_disable_unprepare(priv->usb_20_clk);
133 clk_disable_unprepare(priv->usb_30_clk);
134 clk_disable_unprepare(priv->suspend_clk);
135 }
136 mutex_unlock(&priv->mutex);
137 phy->inited = false;
138 return 0;
139}
140
141static const struct phy_ops brcm_usb_phy_ops = {
142 .init = brcm_usb_phy_init,
143 .exit = brcm_usb_phy_exit,
144 .owner = THIS_MODULE,
145};
146
147static struct phy *brcm_usb_phy_xlate(struct device *dev,
148 struct of_phandle_args *args)
149{
150 struct brcm_usb_phy_data *data = dev_get_drvdata(dev);
151
152 /*
153 * values 0 and 1 are for backward compatibility with
154 * device tree nodes from older bootloaders.
155 */
156 switch (args->args[0]) {
157 case 0:
158 case PHY_TYPE_USB2:
159 if (data->phys[BRCM_USB_PHY_2_0].phy)
160 return data->phys[BRCM_USB_PHY_2_0].phy;
161 dev_warn(dev, "Error, 2.0 Phy not found\n");
162 break;
163 case 1:
164 case PHY_TYPE_USB3:
165 if (data->phys[BRCM_USB_PHY_3_0].phy)
166 return data->phys[BRCM_USB_PHY_3_0].phy;
167 dev_warn(dev, "Error, 3.0 Phy not found\n");
168 break;
169 }
170 return ERR_PTR(-ENODEV);
171}
172
173static int name_to_value(const struct value_to_name_map *table, int count,
174 const char *name, int *value)
175{
176 int x;
177
178 *value = 0;
179 for (x = 0; x < count; x++) {
180 if (sysfs_streq(name, table[x].name)) {
181 *value = x;
182 return 0;
183 }
184 }
185 return -EINVAL;
186}
187
188static const char *value_to_name(const struct value_to_name_map *table, int count,
189 int value)
190{
191 if (value >= count)
192 return "unknown";
193 return table[value].name;
194}
195
196static ssize_t dr_mode_show(struct device *dev,
197 struct device_attribute *attr,
198 char *buf)
199{
200 struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
201
202 return sprintf(buf, "%s\n",
203 value_to_name(&brcm_dr_mode_to_name[0],
204 ARRAY_SIZE(brcm_dr_mode_to_name),
205 priv->ini.mode));
206}
207static DEVICE_ATTR_RO(dr_mode);
208
209static ssize_t dual_select_store(struct device *dev,
210 struct device_attribute *attr,
211 const char *buf, size_t len)
212{
213 struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
214 int value;
215 int res;
216
217 mutex_lock(&sysfs_lock);
218 res = name_to_value(&brcm_dual_mode_to_name[0],
219 ARRAY_SIZE(brcm_dual_mode_to_name), buf, &value);
220 if (!res) {
221 brcm_usb_set_dual_select(&priv->ini, value);
222 res = len;
223 }
224 mutex_unlock(&sysfs_lock);
225 return res;
226}
227
228static ssize_t dual_select_show(struct device *dev,
229 struct device_attribute *attr,
230 char *buf)
231{
232 struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
233 int value;
234
235 mutex_lock(&sysfs_lock);
236 value = brcm_usb_get_dual_select(&priv->ini);
237 mutex_unlock(&sysfs_lock);
238 return sprintf(buf, "%s\n",
239 value_to_name(&brcm_dual_mode_to_name[0],
240 ARRAY_SIZE(brcm_dual_mode_to_name),
241 value));
242}
243static DEVICE_ATTR_RW(dual_select);
244
245static struct attribute *brcm_usb_phy_attrs[] = {
246 &dev_attr_dr_mode.attr,
247 &dev_attr_dual_select.attr,
248 NULL
249};
250
251static const struct attribute_group brcm_usb_phy_group = {
252 .attrs = brcm_usb_phy_attrs,
253};
254
255static const struct match_chip_info chip_info_7216 = {
256 .init_func = &brcm_usb_dvr_init_7216,
257 .required_regs = {
258 BRCM_REGS_CTRL,
259 BRCM_REGS_XHCI_EC,
260 BRCM_REGS_XHCI_GBL,
261 -1,
262 },
263};
264
265static const struct match_chip_info chip_info_7211b0 = {
266 .init_func = &brcm_usb_dvr_init_7211b0,
267 .required_regs = {
268 BRCM_REGS_CTRL,
269 BRCM_REGS_XHCI_EC,
270 BRCM_REGS_XHCI_GBL,
271 BRCM_REGS_USB_PHY,
272 BRCM_REGS_USB_MDIO,
273 -1,
274 },
275 .optional_reg = BRCM_REGS_BDC_EC,
276};
277
278static const struct match_chip_info chip_info_7445 = {
279 .init_func = &brcm_usb_dvr_init_7445,
280 .required_regs = {
281 BRCM_REGS_CTRL,
282 BRCM_REGS_XHCI_EC,
283 -1,
284 },
285};
286
287static const struct of_device_id brcm_usb_dt_ids[] = {
288 {
289 .compatible = "brcm,bcm7216-usb-phy",
290 .data = &chip_info_7216,
291 },
292 {
293 .compatible = "brcm,bcm7211-usb-phy",
294 .data = &chip_info_7211b0,
295 },
296 {
297 .compatible = "brcm,brcmstb-usb-phy",
298 .data = &chip_info_7445,
299 },
300 { /* sentinel */ }
301};
302
303static int brcm_usb_get_regs(struct platform_device *pdev,
304 enum brcmusb_reg_sel regs,
305 struct brcm_usb_init_params *ini,
306 bool optional)
307{
308 struct resource *res;
309
310 /* Older DT nodes have ctrl and optional xhci_ec by index only */
311 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
312 node_reg_names[regs]);
313 if (res == NULL) {
314 if (regs == BRCM_REGS_CTRL) {
315 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
316 } else if (regs == BRCM_REGS_XHCI_EC) {
317 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
318 /* XHCI_EC registers are optional */
319 if (res == NULL)
320 return 0;
321 }
322 if (res == NULL) {
323 if (optional) {
324 dev_dbg(&pdev->dev,
325 "Optional reg %s not found\n",
326 node_reg_names[regs]);
327 return 0;
328 }
329 dev_err(&pdev->dev, "can't get %s base addr\n",
330 node_reg_names[regs]);
331 return 1;
332 }
333 }
334 ini->regs[regs] = devm_ioremap_resource(&pdev->dev, res);
335 if (IS_ERR(ini->regs[regs])) {
336 dev_err(&pdev->dev, "can't map %s register space\n",
337 node_reg_names[regs]);
338 return 1;
339 }
340 return 0;
341}
342
343static int brcm_usb_phy_dvr_init(struct platform_device *pdev,
344 struct brcm_usb_phy_data *priv,
345 struct device_node *dn)
346{
347 struct device *dev = &pdev->dev;
348 struct phy *gphy = NULL;
349 int err;
350
351 priv->usb_20_clk = of_clk_get_by_name(dn, "sw_usb");
352 if (IS_ERR(priv->usb_20_clk)) {
353 if (PTR_ERR(priv->usb_20_clk) == -EPROBE_DEFER)
354 return -EPROBE_DEFER;
355 dev_info(dev, "Clock not found in Device Tree\n");
356 priv->usb_20_clk = NULL;
357 }
358 err = clk_prepare_enable(priv->usb_20_clk);
359 if (err)
360 return err;
361
362 if (priv->has_eohci) {
363 gphy = devm_phy_create(dev, NULL, &brcm_usb_phy_ops);
364 if (IS_ERR(gphy)) {
365 dev_err(dev, "failed to create EHCI/OHCI PHY\n");
366 return PTR_ERR(gphy);
367 }
368 priv->phys[BRCM_USB_PHY_2_0].phy = gphy;
369 priv->phys[BRCM_USB_PHY_2_0].id = BRCM_USB_PHY_2_0;
370 phy_set_drvdata(gphy, &priv->phys[BRCM_USB_PHY_2_0]);
371 }
372
373 if (priv->has_xhci) {
374 gphy = devm_phy_create(dev, NULL, &brcm_usb_phy_ops);
375 if (IS_ERR(gphy)) {
376 dev_err(dev, "failed to create XHCI PHY\n");
377 return PTR_ERR(gphy);
378 }
379 priv->phys[BRCM_USB_PHY_3_0].phy = gphy;
380 priv->phys[BRCM_USB_PHY_3_0].id = BRCM_USB_PHY_3_0;
381 phy_set_drvdata(gphy, &priv->phys[BRCM_USB_PHY_3_0]);
382
383 priv->usb_30_clk = of_clk_get_by_name(dn, "sw_usb3");
384 if (IS_ERR(priv->usb_30_clk)) {
385 if (PTR_ERR(priv->usb_30_clk) == -EPROBE_DEFER)
386 return -EPROBE_DEFER;
387 dev_info(dev,
388 "USB3.0 clock not found in Device Tree\n");
389 priv->usb_30_clk = NULL;
390 }
391 err = clk_prepare_enable(priv->usb_30_clk);
392 if (err)
393 return err;
394 }
395
396 priv->suspend_clk = clk_get(dev, "usb0_freerun");
397 if (IS_ERR(priv->suspend_clk)) {
398 if (PTR_ERR(priv->suspend_clk) == -EPROBE_DEFER)
399 return -EPROBE_DEFER;
400 dev_err(dev, "Suspend Clock not found in Device Tree\n");
401 priv->suspend_clk = NULL;
402 }
403
404 priv->wake_irq = platform_get_irq_byname(pdev, "wake");
405 if (priv->wake_irq < 0)
406 priv->wake_irq = platform_get_irq_byname(pdev, "wakeup");
407 if (priv->wake_irq >= 0) {
408 err = devm_request_irq(dev, priv->wake_irq,
409 brcm_usb_phy_wake_isr, 0,
410 dev_name(dev), gphy);
411 if (err < 0)
412 return err;
413 device_set_wakeup_capable(dev, 1);
414 } else {
415 dev_info(dev,
416 "Wake interrupt missing, system wake not supported\n");
417 }
418
419 return 0;
420}
421
422static int brcm_usb_phy_probe(struct platform_device *pdev)
423{
424 struct device *dev = &pdev->dev;
425 struct brcm_usb_phy_data *priv;
426 struct phy_provider *phy_provider;
427 struct device_node *dn = pdev->dev.of_node;
428 int err;
429 const char *mode;
430 const struct of_device_id *match;
431 void (*dvr_init)(struct brcm_usb_init_params *params);
432 const struct match_chip_info *info;
433 struct regmap *rmap;
434 int x;
435
436 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
437 if (!priv)
438 return -ENOMEM;
439 platform_set_drvdata(pdev, priv);
440
441 priv->ini.family_id = brcmstb_get_family_id();
442 priv->ini.product_id = brcmstb_get_product_id();
443
444 match = of_match_node(brcm_usb_dt_ids, dev->of_node);
445 info = match->data;
446 dvr_init = info->init_func;
447 (*dvr_init)(&priv->ini);
448
449 dev_dbg(dev, "Best mapping table is for %s\n",
450 priv->ini.family_name);
451
452 of_property_read_u32(dn, "brcm,ipp", &priv->ini.ipp);
453 of_property_read_u32(dn, "brcm,ioc", &priv->ini.ioc);
454
455 priv->ini.mode = USB_CTLR_MODE_HOST;
456 err = of_property_read_string(dn, "dr_mode", &mode);
457 if (err == 0) {
458 name_to_value(&brcm_dr_mode_to_name[0],
459 ARRAY_SIZE(brcm_dr_mode_to_name),
460 mode, &priv->ini.mode);
461 }
462 if (of_property_read_bool(dn, "brcm,has-xhci"))
463 priv->has_xhci = true;
464 if (of_property_read_bool(dn, "brcm,has-eohci"))
465 priv->has_eohci = true;
466
467 for (x = 0; x < BRCM_REGS_MAX; x++) {
468 if (info->required_regs[x] >= BRCM_REGS_MAX)
469 break;
470
471 err = brcm_usb_get_regs(pdev, info->required_regs[x],
472 &priv->ini, false);
473 if (err)
474 return -EINVAL;
475 }
476 if (info->optional_reg) {
477 err = brcm_usb_get_regs(pdev, info->optional_reg,
478 &priv->ini, true);
479 if (err)
480 return -EINVAL;
481 }
482
483 err = brcm_usb_phy_dvr_init(pdev, priv, dn);
484 if (err)
485 return err;
486
487 mutex_init(&priv->mutex);
488
489 /* make sure invert settings are correct */
490 brcm_usb_init_ipp(&priv->ini);
491
492 /*
493 * Create sysfs entries for mode.
494 * Remove "dual_select" attribute if not in dual mode
495 */
496 if (priv->ini.mode != USB_CTLR_MODE_DRD)
497 brcm_usb_phy_attrs[1] = NULL;
498 err = sysfs_create_group(&dev->kobj, &brcm_usb_phy_group);
499 if (err)
500 dev_warn(dev, "Error creating sysfs attributes\n");
501
502 /* Get piarbctl syscon if it exists */
503 rmap = syscon_regmap_lookup_by_phandle(dev->of_node,
504 "syscon-piarbctl");
505 if (IS_ERR(rmap))
506 rmap = syscon_regmap_lookup_by_phandle(dev->of_node,
507 "brcm,syscon-piarbctl");
508 if (!IS_ERR(rmap))
509 priv->ini.syscon_piarbctl = rmap;
510
511 /* start with everything off */
512 if (priv->has_xhci)
513 brcm_usb_uninit_xhci(&priv->ini);
514 if (priv->has_eohci)
515 brcm_usb_uninit_eohci(&priv->ini);
516 brcm_usb_uninit_common(&priv->ini);
517 clk_disable_unprepare(priv->usb_20_clk);
518 clk_disable_unprepare(priv->usb_30_clk);
519
520 phy_provider = devm_of_phy_provider_register(dev, brcm_usb_phy_xlate);
521
522 return PTR_ERR_OR_ZERO(phy_provider);
523}
524
525static int brcm_usb_phy_remove(struct platform_device *pdev)
526{
527 sysfs_remove_group(&pdev->dev.kobj, &brcm_usb_phy_group);
528
529 return 0;
530}
531
532#ifdef CONFIG_PM_SLEEP
533static int brcm_usb_phy_suspend(struct device *dev)
534{
535 struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
536
537 if (priv->init_count) {
538 priv->ini.wake_enabled = device_may_wakeup(dev);
539 if (priv->phys[BRCM_USB_PHY_3_0].inited)
540 brcm_usb_uninit_xhci(&priv->ini);
541 if (priv->phys[BRCM_USB_PHY_2_0].inited)
542 brcm_usb_uninit_eohci(&priv->ini);
543 brcm_usb_uninit_common(&priv->ini);
544
545 /*
546 * Handle the clocks unless needed for wake. This has
547 * to work for both older XHCI->3.0-clks, EOHCI->2.0-clks
548 * and newer XHCI->2.0-clks/3.0-clks.
549 */
550
551 if (!priv->ini.suspend_with_clocks) {
552 if (priv->phys[BRCM_USB_PHY_3_0].inited)
553 clk_disable_unprepare(priv->usb_30_clk);
554 if (priv->phys[BRCM_USB_PHY_2_0].inited ||
555 !priv->has_eohci)
556 clk_disable_unprepare(priv->usb_20_clk);
557 }
558 if (priv->wake_irq >= 0)
559 enable_irq_wake(priv->wake_irq);
560 }
561 return 0;
562}
563
564static int brcm_usb_phy_resume(struct device *dev)
565{
566 struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
567
568 clk_prepare_enable(priv->usb_20_clk);
569 clk_prepare_enable(priv->usb_30_clk);
570 brcm_usb_init_ipp(&priv->ini);
571
572 /*
573 * Initialize anything that was previously initialized.
574 * Uninitialize anything that wasn't previously initialized.
575 */
576 if (priv->init_count) {
577 if (priv->wake_irq >= 0)
578 disable_irq_wake(priv->wake_irq);
579 brcm_usb_init_common(&priv->ini);
580 if (priv->phys[BRCM_USB_PHY_2_0].inited) {
581 brcm_usb_init_eohci(&priv->ini);
582 } else if (priv->has_eohci) {
583 brcm_usb_uninit_eohci(&priv->ini);
584 clk_disable_unprepare(priv->usb_20_clk);
585 }
586 if (priv->phys[BRCM_USB_PHY_3_0].inited) {
587 brcm_usb_init_xhci(&priv->ini);
588 } else if (priv->has_xhci) {
589 brcm_usb_uninit_xhci(&priv->ini);
590 clk_disable_unprepare(priv->usb_30_clk);
591 if (!priv->has_eohci)
592 clk_disable_unprepare(priv->usb_20_clk);
593 }
594 } else {
595 if (priv->has_xhci)
596 brcm_usb_uninit_xhci(&priv->ini);
597 if (priv->has_eohci)
598 brcm_usb_uninit_eohci(&priv->ini);
599 brcm_usb_uninit_common(&priv->ini);
600 clk_disable_unprepare(priv->usb_20_clk);
601 clk_disable_unprepare(priv->usb_30_clk);
602 }
603 priv->ini.wake_enabled = false;
604 return 0;
605}
606#endif /* CONFIG_PM_SLEEP */
607
608static const struct dev_pm_ops brcm_usb_phy_pm_ops = {
609 SET_LATE_SYSTEM_SLEEP_PM_OPS(brcm_usb_phy_suspend, brcm_usb_phy_resume)
610};
611
612MODULE_DEVICE_TABLE(of, brcm_usb_dt_ids);
613
614static struct platform_driver brcm_usb_driver = {
615 .probe = brcm_usb_phy_probe,
616 .remove = brcm_usb_phy_remove,
617 .driver = {
618 .name = "brcmstb-usb-phy",
619 .pm = &brcm_usb_phy_pm_ops,
620 .of_match_table = brcm_usb_dt_ids,
621 },
622};
623
624module_platform_driver(brcm_usb_driver);
625
626MODULE_ALIAS("platform:brcmstb-usb-phy");
627MODULE_AUTHOR("Al Cooper <acooper@broadcom.com>");
628MODULE_DESCRIPTION("BRCM USB PHY driver");
629MODULE_LICENSE("GPL v2");