1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * USB transceiver driver for AB8500 family chips
4 *
5 * Copyright (C) 2010-2013 ST-Ericsson AB
6 * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
7 * Avinash Kumar <avinash.kumar@stericsson.com>
8 * Thirupathi Chippakurthy <thirupathi.chippakurthy@stericsson.com>
9 */
10
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/usb/otg.h>
14 #include <linux/slab.h>
15 #include <linux/notifier.h>
16 #include <linux/interrupt.h>
17 #include <linux/delay.h>
18 #include <linux/clk.h>
19 #include <linux/err.h>
20 #include <linux/mfd/abx500.h>
21 #include <linux/mfd/abx500/ab8500.h>
22 #include <linux/usb/musb-ux500.h>
23 #include <linux/regulator/consumer.h>
24 #include <linux/pinctrl/consumer.h>
25
26 /* Bank AB8500_SYS_CTRL2_BLOCK */
27 #define AB8500_MAIN_WD_CTRL_REG 0x01
28
29 /* Bank AB8500_USB */
30 #define AB8500_USB_LINE_STAT_REG 0x80
31 #define AB8505_USB_LINE_STAT_REG 0x94
32 #define AB8500_USB_PHY_CTRL_REG 0x8A
33
34 /* Bank AB8500_DEVELOPMENT */
35 #define AB8500_BANK12_ACCESS 0x00
36
37 /* Bank AB8500_DEBUG */
38 #define AB8500_USB_PHY_TUNE1 0x05
39 #define AB8500_USB_PHY_TUNE2 0x06
40 #define AB8500_USB_PHY_TUNE3 0x07
41
42 /* Bank AB8500_INTERRUPT */
43 #define AB8500_IT_SOURCE2_REG 0x01
44
45 #define AB8500_BIT_OTG_STAT_ID (1 << 0)
46 #define AB8500_BIT_PHY_CTRL_HOST_EN (1 << 0)
47 #define AB8500_BIT_PHY_CTRL_DEVICE_EN (1 << 1)
48 #define AB8500_BIT_WD_CTRL_ENABLE (1 << 0)
49 #define AB8500_BIT_WD_CTRL_KICK (1 << 1)
50 #define AB8500_BIT_SOURCE2_VBUSDET (1 << 7)
51
52 #define AB8500_WD_KICK_DELAY_US 100 /* usec */
53 #define AB8500_WD_V11_DISABLE_DELAY_US 100 /* usec */
54 #define AB8500_V20_31952_DISABLE_DELAY_US 100 /* usec */
55
56 /* Usb line status register */
57 enum ab8500_usb_link_status {
58 USB_LINK_NOT_CONFIGURED_8500 = 0,
59 USB_LINK_STD_HOST_NC_8500,
60 USB_LINK_STD_HOST_C_NS_8500,
61 USB_LINK_STD_HOST_C_S_8500,
62 USB_LINK_HOST_CHG_NM_8500,
63 USB_LINK_HOST_CHG_HS_8500,
64 USB_LINK_HOST_CHG_HS_CHIRP_8500,
65 USB_LINK_DEDICATED_CHG_8500,
66 USB_LINK_ACA_RID_A_8500,
67 USB_LINK_ACA_RID_B_8500,
68 USB_LINK_ACA_RID_C_NM_8500,
69 USB_LINK_ACA_RID_C_HS_8500,
70 USB_LINK_ACA_RID_C_HS_CHIRP_8500,
71 USB_LINK_HM_IDGND_8500,
72 USB_LINK_RESERVED_8500,
73 USB_LINK_NOT_VALID_LINK_8500,
74 };
75
76 enum ab8505_usb_link_status {
77 USB_LINK_NOT_CONFIGURED_8505 = 0,
78 USB_LINK_STD_HOST_NC_8505,
79 USB_LINK_STD_HOST_C_NS_8505,
80 USB_LINK_STD_HOST_C_S_8505,
81 USB_LINK_CDP_8505,
82 USB_LINK_RESERVED0_8505,
83 USB_LINK_RESERVED1_8505,
84 USB_LINK_DEDICATED_CHG_8505,
85 USB_LINK_ACA_RID_A_8505,
86 USB_LINK_ACA_RID_B_8505,
87 USB_LINK_ACA_RID_C_NM_8505,
88 USB_LINK_RESERVED2_8505,
89 USB_LINK_RESERVED3_8505,
90 USB_LINK_HM_IDGND_8505,
91 USB_LINK_CHARGERPORT_NOT_OK_8505,
92 USB_LINK_CHARGER_DM_HIGH_8505,
93 USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8505,
94 USB_LINK_STD_UPSTREAM_NO_IDGNG_NO_VBUS_8505,
95 USB_LINK_STD_UPSTREAM_8505,
96 USB_LINK_CHARGER_SE1_8505,
97 USB_LINK_CARKIT_CHGR_1_8505,
98 USB_LINK_CARKIT_CHGR_2_8505,
99 USB_LINK_ACA_DOCK_CHGR_8505,
100 USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_8505,
101 USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_8505,
102 USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8505,
103 USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8505,
104 USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8505,
105 };
106
107 enum ab8500_usb_mode {
108 USB_IDLE = 0,
109 USB_PERIPHERAL,
110 USB_HOST,
111 USB_DEDICATED_CHG,
112 USB_UART
113 };
114
115 /* Register USB_LINK_STATUS interrupt */
116 #define AB8500_USB_FLAG_USE_LINK_STATUS_IRQ (1 << 0)
117 /* Register ID_WAKEUP_F interrupt */
118 #define AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ (1 << 1)
119 /* Register VBUS_DET_F interrupt */
120 #define AB8500_USB_FLAG_USE_VBUS_DET_IRQ (1 << 2)
121 /* Driver is using the ab-iddet driver*/
122 #define AB8500_USB_FLAG_USE_AB_IDDET (1 << 3)
123 /* Enable setting regulators voltage */
124 #define AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE (1 << 4)
125
126 struct ab8500_usb {
127 struct usb_phy phy;
128 struct device *dev;
129 struct ab8500 *ab8500;
130 unsigned vbus_draw;
131 struct work_struct phy_dis_work;
132 enum ab8500_usb_mode mode;
133 struct clk *sysclk;
134 struct regulator *v_ape;
135 struct regulator *v_musb;
136 struct regulator *v_ulpi;
137 int saved_v_ulpi;
138 int previous_link_status_state;
139 struct pinctrl *pinctrl;
140 struct pinctrl_state *pins_sleep;
141 bool enabled_charging_detection;
142 unsigned int flags;
143 };
144
phy_to_ab(struct usb_phy * x)145 static inline struct ab8500_usb *phy_to_ab(struct usb_phy *x)
146 {
147 return container_of(x, struct ab8500_usb, phy);
148 }
149
ab8500_usb_wd_workaround(struct ab8500_usb * ab)150 static void ab8500_usb_wd_workaround(struct ab8500_usb *ab)
151 {
152 abx500_set_register_interruptible(ab->dev,
153 AB8500_SYS_CTRL2_BLOCK,
154 AB8500_MAIN_WD_CTRL_REG,
155 AB8500_BIT_WD_CTRL_ENABLE);
156
157 udelay(AB8500_WD_KICK_DELAY_US);
158
159 abx500_set_register_interruptible(ab->dev,
160 AB8500_SYS_CTRL2_BLOCK,
161 AB8500_MAIN_WD_CTRL_REG,
162 (AB8500_BIT_WD_CTRL_ENABLE
163 | AB8500_BIT_WD_CTRL_KICK));
164
165 udelay(AB8500_WD_V11_DISABLE_DELAY_US);
166
167 abx500_set_register_interruptible(ab->dev,
168 AB8500_SYS_CTRL2_BLOCK,
169 AB8500_MAIN_WD_CTRL_REG,
170 0);
171 }
172
ab8500_usb_regulator_enable(struct ab8500_usb * ab)173 static void ab8500_usb_regulator_enable(struct ab8500_usb *ab)
174 {
175 int ret, volt;
176
177 ret = regulator_enable(ab->v_ape);
178 if (ret)
179 dev_err(ab->dev, "Failed to enable v-ape\n");
180
181 if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
182 ab->saved_v_ulpi = regulator_get_voltage(ab->v_ulpi);
183 if (ab->saved_v_ulpi < 0)
184 dev_err(ab->dev, "Failed to get v_ulpi voltage\n");
185
186 ret = regulator_set_voltage(ab->v_ulpi, 1300000, 1350000);
187 if (ret < 0)
188 dev_err(ab->dev, "Failed to set the Vintcore to 1.3V, ret=%d\n",
189 ret);
190
191 ret = regulator_set_load(ab->v_ulpi, 28000);
192 if (ret < 0)
193 dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
194 ret);
195 }
196
197 ret = regulator_enable(ab->v_ulpi);
198 if (ret)
199 dev_err(ab->dev, "Failed to enable vddulpivio18\n");
200
201 if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
202 volt = regulator_get_voltage(ab->v_ulpi);
203 if ((volt != 1300000) && (volt != 1350000))
204 dev_err(ab->dev, "Vintcore is not set to 1.3V volt=%d\n",
205 volt);
206 }
207
208 ret = regulator_enable(ab->v_musb);
209 if (ret)
210 dev_err(ab->dev, "Failed to enable musb_1v8\n");
211 }
212
ab8500_usb_regulator_disable(struct ab8500_usb * ab)213 static void ab8500_usb_regulator_disable(struct ab8500_usb *ab)
214 {
215 int ret;
216
217 regulator_disable(ab->v_musb);
218
219 regulator_disable(ab->v_ulpi);
220
221 /* USB is not the only consumer of Vintcore, restore old settings */
222 if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
223 if (ab->saved_v_ulpi > 0) {
224 ret = regulator_set_voltage(ab->v_ulpi,
225 ab->saved_v_ulpi, ab->saved_v_ulpi);
226 if (ret < 0)
227 dev_err(ab->dev, "Failed to set the Vintcore to %duV, ret=%d\n",
228 ab->saved_v_ulpi, ret);
229 }
230
231 ret = regulator_set_load(ab->v_ulpi, 0);
232 if (ret < 0)
233 dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
234 ret);
235 }
236
237 regulator_disable(ab->v_ape);
238 }
239
ab8500_usb_wd_linkstatus(struct ab8500_usb * ab,u8 bit)240 static void ab8500_usb_wd_linkstatus(struct ab8500_usb *ab, u8 bit)
241 {
242 /* Workaround for v2.0 bug # 31952 */
243 if (is_ab8500_2p0(ab->ab8500)) {
244 abx500_mask_and_set_register_interruptible(ab->dev,
245 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
246 bit, bit);
247 udelay(AB8500_V20_31952_DISABLE_DELAY_US);
248 }
249 }
250
ab8500_usb_phy_enable(struct ab8500_usb * ab,bool sel_host)251 static void ab8500_usb_phy_enable(struct ab8500_usb *ab, bool sel_host)
252 {
253 u8 bit;
254 bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
255 AB8500_BIT_PHY_CTRL_DEVICE_EN;
256
257 /* mux and configure USB pins to DEFAULT state */
258 ab->pinctrl = pinctrl_get_select(ab->dev, PINCTRL_STATE_DEFAULT);
259 if (IS_ERR(ab->pinctrl))
260 dev_err(ab->dev, "could not get/set default pinstate\n");
261
262 if (clk_prepare_enable(ab->sysclk))
263 dev_err(ab->dev, "can't prepare/enable clock\n");
264
265 ab8500_usb_regulator_enable(ab);
266
267 abx500_mask_and_set_register_interruptible(ab->dev,
268 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
269 bit, bit);
270 }
271
ab8500_usb_phy_disable(struct ab8500_usb * ab,bool sel_host)272 static void ab8500_usb_phy_disable(struct ab8500_usb *ab, bool sel_host)
273 {
274 u8 bit;
275 bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
276 AB8500_BIT_PHY_CTRL_DEVICE_EN;
277
278 ab8500_usb_wd_linkstatus(ab, bit);
279
280 abx500_mask_and_set_register_interruptible(ab->dev,
281 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
282 bit, 0);
283
284 /* Needed to disable the phy.*/
285 ab8500_usb_wd_workaround(ab);
286
287 clk_disable_unprepare(ab->sysclk);
288
289 ab8500_usb_regulator_disable(ab);
290
291 if (!IS_ERR(ab->pinctrl)) {
292 /* configure USB pins to SLEEP state */
293 ab->pins_sleep = pinctrl_lookup_state(ab->pinctrl,
294 PINCTRL_STATE_SLEEP);
295
296 if (IS_ERR(ab->pins_sleep))
297 dev_dbg(ab->dev, "could not get sleep pinstate\n");
298 else if (pinctrl_select_state(ab->pinctrl, ab->pins_sleep))
299 dev_err(ab->dev, "could not set pins to sleep state\n");
300
301 /*
302 * as USB pins are shared with iddet, release them to allow
303 * iddet to request them
304 */
305 pinctrl_put(ab->pinctrl);
306 }
307 }
308
309 #define ab8500_usb_host_phy_en(ab) ab8500_usb_phy_enable(ab, true)
310 #define ab8500_usb_host_phy_dis(ab) ab8500_usb_phy_disable(ab, true)
311 #define ab8500_usb_peri_phy_en(ab) ab8500_usb_phy_enable(ab, false)
312 #define ab8500_usb_peri_phy_dis(ab) ab8500_usb_phy_disable(ab, false)
313
ab8505_usb_link_status_update(struct ab8500_usb * ab,enum ab8505_usb_link_status lsts)314 static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
315 enum ab8505_usb_link_status lsts)
316 {
317 enum ux500_musb_vbus_id_status event = 0;
318
319 dev_dbg(ab->dev, "ab8505_usb_link_status_update %d\n", lsts);
320
321 /*
322 * Spurious link_status interrupts are seen at the time of
323 * disconnection of a device in RIDA state
324 */
325 if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8505 &&
326 (lsts == USB_LINK_STD_HOST_NC_8505))
327 return 0;
328
329 ab->previous_link_status_state = lsts;
330
331 switch (lsts) {
332 case USB_LINK_ACA_RID_B_8505:
333 event = UX500_MUSB_RIDB;
334 fallthrough;
335 case USB_LINK_NOT_CONFIGURED_8505:
336 case USB_LINK_RESERVED0_8505:
337 case USB_LINK_RESERVED1_8505:
338 case USB_LINK_RESERVED2_8505:
339 case USB_LINK_RESERVED3_8505:
340 ab->mode = USB_IDLE;
341 ab->phy.otg->default_a = false;
342 ab->vbus_draw = 0;
343 if (event != UX500_MUSB_RIDB)
344 event = UX500_MUSB_NONE;
345 /*
346 * Fallback to default B_IDLE as nothing
347 * is connected
348 */
349 ab->phy.otg->state = OTG_STATE_B_IDLE;
350 usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
351 break;
352
353 case USB_LINK_ACA_RID_C_NM_8505:
354 event = UX500_MUSB_RIDC;
355 fallthrough;
356 case USB_LINK_STD_HOST_NC_8505:
357 case USB_LINK_STD_HOST_C_NS_8505:
358 case USB_LINK_STD_HOST_C_S_8505:
359 case USB_LINK_CDP_8505:
360 if (ab->mode == USB_IDLE) {
361 ab->mode = USB_PERIPHERAL;
362 ab8500_usb_peri_phy_en(ab);
363 atomic_notifier_call_chain(&ab->phy.notifier,
364 UX500_MUSB_PREPARE, &ab->vbus_draw);
365 usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
366 }
367 if (event != UX500_MUSB_RIDC)
368 event = UX500_MUSB_VBUS;
369 break;
370
371 case USB_LINK_ACA_RID_A_8505:
372 case USB_LINK_ACA_DOCK_CHGR_8505:
373 event = UX500_MUSB_RIDA;
374 fallthrough;
375 case USB_LINK_HM_IDGND_8505:
376 if (ab->mode == USB_IDLE) {
377 ab->mode = USB_HOST;
378 ab8500_usb_host_phy_en(ab);
379 atomic_notifier_call_chain(&ab->phy.notifier,
380 UX500_MUSB_PREPARE, &ab->vbus_draw);
381 }
382 ab->phy.otg->default_a = true;
383 if (event != UX500_MUSB_RIDA)
384 event = UX500_MUSB_ID;
385 atomic_notifier_call_chain(&ab->phy.notifier,
386 event, &ab->vbus_draw);
387 break;
388
389 case USB_LINK_DEDICATED_CHG_8505:
390 ab->mode = USB_DEDICATED_CHG;
391 event = UX500_MUSB_CHARGER;
392 atomic_notifier_call_chain(&ab->phy.notifier,
393 event, &ab->vbus_draw);
394 usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
395 break;
396
397 /*
398 * FIXME: For now we rely on the boot firmware to set up the necessary
399 * PHY/pin configuration for UART mode.
400 *
401 * AB8505 does not seem to report any status change for UART cables,
402 * possibly because it cannot detect them autonomously.
403 * We may need to measure the ID resistance manually to reliably
404 * detect UART cables after bootup.
405 */
406 case USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8505:
407 case USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8505:
408 if (ab->mode == USB_IDLE) {
409 ab->mode = USB_UART;
410 ab8500_usb_peri_phy_en(ab);
411 }
412
413 break;
414
415 default:
416 break;
417 }
418
419 return 0;
420 }
421
ab8500_usb_link_status_update(struct ab8500_usb * ab,enum ab8500_usb_link_status lsts)422 static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
423 enum ab8500_usb_link_status lsts)
424 {
425 enum ux500_musb_vbus_id_status event = 0;
426
427 dev_dbg(ab->dev, "ab8500_usb_link_status_update %d\n", lsts);
428
429 /*
430 * Spurious link_status interrupts are seen in case of a
431 * disconnection of a device in IDGND and RIDA stage
432 */
433 if (ab->previous_link_status_state == USB_LINK_HM_IDGND_8500 &&
434 (lsts == USB_LINK_STD_HOST_C_NS_8500 ||
435 lsts == USB_LINK_STD_HOST_NC_8500))
436 return 0;
437
438 if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8500 &&
439 lsts == USB_LINK_STD_HOST_NC_8500)
440 return 0;
441
442 ab->previous_link_status_state = lsts;
443
444 switch (lsts) {
445 case USB_LINK_ACA_RID_B_8500:
446 event = UX500_MUSB_RIDB;
447 fallthrough;
448 case USB_LINK_NOT_CONFIGURED_8500:
449 case USB_LINK_NOT_VALID_LINK_8500:
450 ab->mode = USB_IDLE;
451 ab->phy.otg->default_a = false;
452 ab->vbus_draw = 0;
453 if (event != UX500_MUSB_RIDB)
454 event = UX500_MUSB_NONE;
455 /* Fallback to default B_IDLE as nothing is connected */
456 ab->phy.otg->state = OTG_STATE_B_IDLE;
457 usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
458 break;
459
460 case USB_LINK_ACA_RID_C_NM_8500:
461 case USB_LINK_ACA_RID_C_HS_8500:
462 case USB_LINK_ACA_RID_C_HS_CHIRP_8500:
463 event = UX500_MUSB_RIDC;
464 fallthrough;
465 case USB_LINK_STD_HOST_NC_8500:
466 case USB_LINK_STD_HOST_C_NS_8500:
467 case USB_LINK_STD_HOST_C_S_8500:
468 case USB_LINK_HOST_CHG_NM_8500:
469 case USB_LINK_HOST_CHG_HS_8500:
470 case USB_LINK_HOST_CHG_HS_CHIRP_8500:
471 if (ab->mode == USB_IDLE) {
472 ab->mode = USB_PERIPHERAL;
473 ab8500_usb_peri_phy_en(ab);
474 atomic_notifier_call_chain(&ab->phy.notifier,
475 UX500_MUSB_PREPARE, &ab->vbus_draw);
476 usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
477 }
478 if (event != UX500_MUSB_RIDC)
479 event = UX500_MUSB_VBUS;
480 break;
481
482 case USB_LINK_ACA_RID_A_8500:
483 event = UX500_MUSB_RIDA;
484 fallthrough;
485 case USB_LINK_HM_IDGND_8500:
486 if (ab->mode == USB_IDLE) {
487 ab->mode = USB_HOST;
488 ab8500_usb_host_phy_en(ab);
489 atomic_notifier_call_chain(&ab->phy.notifier,
490 UX500_MUSB_PREPARE, &ab->vbus_draw);
491 }
492 ab->phy.otg->default_a = true;
493 if (event != UX500_MUSB_RIDA)
494 event = UX500_MUSB_ID;
495 atomic_notifier_call_chain(&ab->phy.notifier,
496 event, &ab->vbus_draw);
497 break;
498
499 case USB_LINK_DEDICATED_CHG_8500:
500 ab->mode = USB_DEDICATED_CHG;
501 event = UX500_MUSB_CHARGER;
502 atomic_notifier_call_chain(&ab->phy.notifier,
503 event, &ab->vbus_draw);
504 usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
505 break;
506
507 case USB_LINK_RESERVED_8500:
508 break;
509 }
510
511 return 0;
512 }
513
514 /*
515 * Connection Sequence:
516 * 1. Link Status Interrupt
517 * 2. Enable AB clock
518 * 3. Enable AB regulators
519 * 4. Enable USB phy
520 * 5. Reset the musb controller
521 * 6. Switch the ULPI GPIO pins to function mode
522 * 7. Enable the musb Peripheral5 clock
523 * 8. Restore MUSB context
524 */
abx500_usb_link_status_update(struct ab8500_usb * ab)525 static int abx500_usb_link_status_update(struct ab8500_usb *ab)
526 {
527 u8 reg;
528 int ret = 0;
529
530 if (is_ab8500(ab->ab8500)) {
531 enum ab8500_usb_link_status lsts;
532
533 ret = abx500_get_register_interruptible(ab->dev,
534 AB8500_USB, AB8500_USB_LINE_STAT_REG, ®);
535 if (ret < 0)
536 return ret;
537 lsts = (reg >> 3) & 0x0F;
538 ret = ab8500_usb_link_status_update(ab, lsts);
539 } else if (is_ab8505(ab->ab8500)) {
540 enum ab8505_usb_link_status lsts;
541
542 ret = abx500_get_register_interruptible(ab->dev,
543 AB8500_USB, AB8505_USB_LINE_STAT_REG, ®);
544 if (ret < 0)
545 return ret;
546 lsts = (reg >> 3) & 0x1F;
547 ret = ab8505_usb_link_status_update(ab, lsts);
548 }
549
550 return ret;
551 }
552
553 /*
554 * Disconnection Sequence:
555 * 1. Disconnect Interrupt
556 * 2. Disable regulators
557 * 3. Disable AB clock
558 * 4. Disable the Phy
559 * 5. Link Status Interrupt
560 * 6. Disable Musb Clock
561 */
ab8500_usb_disconnect_irq(int irq,void * data)562 static irqreturn_t ab8500_usb_disconnect_irq(int irq, void *data)
563 {
564 struct ab8500_usb *ab = (struct ab8500_usb *) data;
565 enum usb_phy_events event = USB_EVENT_NONE;
566
567 /* Link status will not be updated till phy is disabled. */
568 if (ab->mode == USB_HOST) {
569 ab->phy.otg->default_a = false;
570 ab->vbus_draw = 0;
571 atomic_notifier_call_chain(&ab->phy.notifier,
572 event, &ab->vbus_draw);
573 ab8500_usb_host_phy_dis(ab);
574 ab->mode = USB_IDLE;
575 }
576
577 if (ab->mode == USB_PERIPHERAL) {
578 atomic_notifier_call_chain(&ab->phy.notifier,
579 event, &ab->vbus_draw);
580 ab8500_usb_peri_phy_dis(ab);
581 atomic_notifier_call_chain(&ab->phy.notifier,
582 UX500_MUSB_CLEAN, &ab->vbus_draw);
583 ab->mode = USB_IDLE;
584 ab->phy.otg->default_a = false;
585 ab->vbus_draw = 0;
586 }
587
588 if (ab->mode == USB_UART) {
589 ab8500_usb_peri_phy_dis(ab);
590 ab->mode = USB_IDLE;
591 }
592
593 if (is_ab8500_2p0(ab->ab8500)) {
594 if (ab->mode == USB_DEDICATED_CHG) {
595 ab8500_usb_wd_linkstatus(ab,
596 AB8500_BIT_PHY_CTRL_DEVICE_EN);
597 abx500_mask_and_set_register_interruptible(ab->dev,
598 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
599 AB8500_BIT_PHY_CTRL_DEVICE_EN, 0);
600 }
601 }
602
603 return IRQ_HANDLED;
604 }
605
ab8500_usb_link_status_irq(int irq,void * data)606 static irqreturn_t ab8500_usb_link_status_irq(int irq, void *data)
607 {
608 struct ab8500_usb *ab = (struct ab8500_usb *)data;
609
610 abx500_usb_link_status_update(ab);
611
612 return IRQ_HANDLED;
613 }
614
ab8500_usb_phy_disable_work(struct work_struct * work)615 static void ab8500_usb_phy_disable_work(struct work_struct *work)
616 {
617 struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
618 phy_dis_work);
619
620 if (!ab->phy.otg->host)
621 ab8500_usb_host_phy_dis(ab);
622
623 if (!ab->phy.otg->gadget)
624 ab8500_usb_peri_phy_dis(ab);
625 }
626
ab8500_usb_set_suspend(struct usb_phy * x,int suspend)627 static int ab8500_usb_set_suspend(struct usb_phy *x, int suspend)
628 {
629 /* TODO */
630 return 0;
631 }
632
ab8500_usb_set_peripheral(struct usb_otg * otg,struct usb_gadget * gadget)633 static int ab8500_usb_set_peripheral(struct usb_otg *otg,
634 struct usb_gadget *gadget)
635 {
636 struct ab8500_usb *ab;
637
638 if (!otg)
639 return -ENODEV;
640
641 ab = phy_to_ab(otg->usb_phy);
642
643 ab->phy.otg->gadget = gadget;
644
645 /* Some drivers call this function in atomic context.
646 * Do not update ab8500 registers directly till this
647 * is fixed.
648 */
649
650 if ((ab->mode != USB_IDLE) && !gadget) {
651 ab->mode = USB_IDLE;
652 schedule_work(&ab->phy_dis_work);
653 }
654
655 return 0;
656 }
657
ab8500_usb_set_host(struct usb_otg * otg,struct usb_bus * host)658 static int ab8500_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
659 {
660 struct ab8500_usb *ab;
661
662 if (!otg)
663 return -ENODEV;
664
665 ab = phy_to_ab(otg->usb_phy);
666
667 ab->phy.otg->host = host;
668
669 /* Some drivers call this function in atomic context.
670 * Do not update ab8500 registers directly till this
671 * is fixed.
672 */
673
674 if ((ab->mode != USB_IDLE) && !host) {
675 ab->mode = USB_IDLE;
676 schedule_work(&ab->phy_dis_work);
677 }
678
679 return 0;
680 }
681
ab8500_usb_restart_phy(struct ab8500_usb * ab)682 static void ab8500_usb_restart_phy(struct ab8500_usb *ab)
683 {
684 abx500_mask_and_set_register_interruptible(ab->dev,
685 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
686 AB8500_BIT_PHY_CTRL_DEVICE_EN,
687 AB8500_BIT_PHY_CTRL_DEVICE_EN);
688
689 udelay(100);
690
691 abx500_mask_and_set_register_interruptible(ab->dev,
692 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
693 AB8500_BIT_PHY_CTRL_DEVICE_EN,
694 0);
695
696 abx500_mask_and_set_register_interruptible(ab->dev,
697 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
698 AB8500_BIT_PHY_CTRL_HOST_EN,
699 AB8500_BIT_PHY_CTRL_HOST_EN);
700
701 udelay(100);
702
703 abx500_mask_and_set_register_interruptible(ab->dev,
704 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
705 AB8500_BIT_PHY_CTRL_HOST_EN,
706 0);
707 }
708
ab8500_usb_regulator_get(struct ab8500_usb * ab)709 static int ab8500_usb_regulator_get(struct ab8500_usb *ab)
710 {
711 int err;
712
713 ab->v_ape = devm_regulator_get(ab->dev, "v-ape");
714 if (IS_ERR(ab->v_ape)) {
715 dev_err(ab->dev, "Could not get v-ape supply\n");
716 err = PTR_ERR(ab->v_ape);
717 return err;
718 }
719
720 ab->v_ulpi = devm_regulator_get(ab->dev, "vddulpivio18");
721 if (IS_ERR(ab->v_ulpi)) {
722 dev_err(ab->dev, "Could not get vddulpivio18 supply\n");
723 err = PTR_ERR(ab->v_ulpi);
724 return err;
725 }
726
727 ab->v_musb = devm_regulator_get(ab->dev, "musb_1v8");
728 if (IS_ERR(ab->v_musb)) {
729 dev_err(ab->dev, "Could not get musb_1v8 supply\n");
730 err = PTR_ERR(ab->v_musb);
731 return err;
732 }
733
734 return 0;
735 }
736
ab8500_usb_irq_setup(struct platform_device * pdev,struct ab8500_usb * ab)737 static int ab8500_usb_irq_setup(struct platform_device *pdev,
738 struct ab8500_usb *ab)
739 {
740 int err;
741 int irq;
742
743 if (ab->flags & AB8500_USB_FLAG_USE_LINK_STATUS_IRQ) {
744 irq = platform_get_irq_byname(pdev, "USB_LINK_STATUS");
745 if (irq < 0)
746 return irq;
747 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
748 ab8500_usb_link_status_irq,
749 IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
750 "usb-link-status", ab);
751 if (err < 0) {
752 dev_err(ab->dev, "request_irq failed for link status irq\n");
753 return err;
754 }
755 }
756
757 if (ab->flags & AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ) {
758 irq = platform_get_irq_byname(pdev, "ID_WAKEUP_F");
759 if (irq < 0)
760 return irq;
761 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
762 ab8500_usb_disconnect_irq,
763 IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
764 "usb-id-fall", ab);
765 if (err < 0) {
766 dev_err(ab->dev, "request_irq failed for ID fall irq\n");
767 return err;
768 }
769 }
770
771 if (ab->flags & AB8500_USB_FLAG_USE_VBUS_DET_IRQ) {
772 irq = platform_get_irq_byname(pdev, "VBUS_DET_F");
773 if (irq < 0)
774 return irq;
775 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
776 ab8500_usb_disconnect_irq,
777 IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
778 "usb-vbus-fall", ab);
779 if (err < 0) {
780 dev_err(ab->dev, "request_irq failed for Vbus fall irq\n");
781 return err;
782 }
783 }
784
785 return 0;
786 }
787
ab8500_usb_set_ab8500_tuning_values(struct ab8500_usb * ab)788 static void ab8500_usb_set_ab8500_tuning_values(struct ab8500_usb *ab)
789 {
790 int err;
791
792 /* Enable the PBT/Bank 0x12 access */
793 err = abx500_set_register_interruptible(ab->dev,
794 AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x01);
795 if (err < 0)
796 dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
797 err);
798
799 err = abx500_set_register_interruptible(ab->dev,
800 AB8500_DEBUG, AB8500_USB_PHY_TUNE1, 0xC8);
801 if (err < 0)
802 dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
803 err);
804
805 err = abx500_set_register_interruptible(ab->dev,
806 AB8500_DEBUG, AB8500_USB_PHY_TUNE2, 0x00);
807 if (err < 0)
808 dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
809 err);
810
811 err = abx500_set_register_interruptible(ab->dev,
812 AB8500_DEBUG, AB8500_USB_PHY_TUNE3, 0x78);
813 if (err < 0)
814 dev_err(ab->dev, "Failed to set PHY_TUNE3 register err=%d\n",
815 err);
816
817 /* Switch to normal mode/disable Bank 0x12 access */
818 err = abx500_set_register_interruptible(ab->dev,
819 AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x00);
820 if (err < 0)
821 dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
822 err);
823 }
824
ab8500_usb_set_ab8505_tuning_values(struct ab8500_usb * ab)825 static void ab8500_usb_set_ab8505_tuning_values(struct ab8500_usb *ab)
826 {
827 int err;
828
829 /* Enable the PBT/Bank 0x12 access */
830 err = abx500_mask_and_set_register_interruptible(ab->dev,
831 AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
832 0x01, 0x01);
833 if (err < 0)
834 dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
835 err);
836
837 err = abx500_mask_and_set_register_interruptible(ab->dev,
838 AB8500_DEBUG, AB8500_USB_PHY_TUNE1,
839 0xC8, 0xC8);
840 if (err < 0)
841 dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
842 err);
843
844 err = abx500_mask_and_set_register_interruptible(ab->dev,
845 AB8500_DEBUG, AB8500_USB_PHY_TUNE2,
846 0x60, 0x60);
847 if (err < 0)
848 dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
849 err);
850
851 err = abx500_mask_and_set_register_interruptible(ab->dev,
852 AB8500_DEBUG, AB8500_USB_PHY_TUNE3,
853 0xFC, 0x80);
854
855 if (err < 0)
856 dev_err(ab->dev, "Failed to set PHY_TUNE3 register err=%d\n",
857 err);
858
859 /* Switch to normal mode/disable Bank 0x12 access */
860 err = abx500_mask_and_set_register_interruptible(ab->dev,
861 AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
862 0x00, 0x00);
863 if (err < 0)
864 dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
865 err);
866 }
867
ab8500_usb_probe(struct platform_device * pdev)868 static int ab8500_usb_probe(struct platform_device *pdev)
869 {
870 struct ab8500_usb *ab;
871 struct ab8500 *ab8500;
872 struct usb_otg *otg;
873 int err;
874 int rev;
875
876 ab8500 = dev_get_drvdata(pdev->dev.parent);
877 rev = abx500_get_chip_id(&pdev->dev);
878
879 if (is_ab8500_1p1_or_earlier(ab8500)) {
880 dev_err(&pdev->dev, "Unsupported AB8500 chip rev=%d\n", rev);
881 return -ENODEV;
882 }
883
884 ab = devm_kzalloc(&pdev->dev, sizeof(*ab), GFP_KERNEL);
885 if (!ab)
886 return -ENOMEM;
887
888 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
889 if (!otg)
890 return -ENOMEM;
891
892 ab->dev = &pdev->dev;
893 ab->ab8500 = ab8500;
894 ab->phy.dev = ab->dev;
895 ab->phy.otg = otg;
896 ab->phy.label = "ab8500";
897 ab->phy.set_suspend = ab8500_usb_set_suspend;
898 ab->phy.otg->state = OTG_STATE_UNDEFINED;
899
900 otg->usb_phy = &ab->phy;
901 otg->set_host = ab8500_usb_set_host;
902 otg->set_peripheral = ab8500_usb_set_peripheral;
903
904 if (is_ab8500(ab->ab8500)) {
905 ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
906 AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
907 AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
908 AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
909 } else if (is_ab8505(ab->ab8500)) {
910 ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
911 AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
912 AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
913 AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
914 }
915
916 /* Disable regulator voltage setting for AB8500 <= v2.0 */
917 if (is_ab8500_2p0_or_earlier(ab->ab8500))
918 ab->flags &= ~AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
919
920 platform_set_drvdata(pdev, ab);
921
922 /* all: Disable phy when called from set_host and set_peripheral */
923 INIT_WORK(&ab->phy_dis_work, ab8500_usb_phy_disable_work);
924
925 err = ab8500_usb_regulator_get(ab);
926 if (err)
927 return err;
928
929 ab->sysclk = devm_clk_get(ab->dev, "sysclk");
930 if (IS_ERR(ab->sysclk)) {
931 dev_err(ab->dev, "Could not get sysclk.\n");
932 return PTR_ERR(ab->sysclk);
933 }
934
935 err = ab8500_usb_irq_setup(pdev, ab);
936 if (err < 0)
937 return err;
938
939 err = usb_add_phy(&ab->phy, USB_PHY_TYPE_USB2);
940 if (err) {
941 dev_err(&pdev->dev, "Can't register transceiver\n");
942 return err;
943 }
944
945 if (is_ab8500(ab->ab8500) && !is_ab8500_2p0_or_earlier(ab->ab8500))
946 /* Phy tuning values for AB8500 > v2.0 */
947 ab8500_usb_set_ab8500_tuning_values(ab);
948 else if (is_ab8505(ab->ab8500))
949 /* Phy tuning values for AB8505 */
950 ab8500_usb_set_ab8505_tuning_values(ab);
951
952 /* Needed to enable ID detection. */
953 ab8500_usb_wd_workaround(ab);
954
955 /*
956 * This is required for usb-link-status to work properly when a
957 * cable is connected at boot time.
958 */
959 ab8500_usb_restart_phy(ab);
960
961 abx500_usb_link_status_update(ab);
962
963 dev_info(&pdev->dev, "revision 0x%2x driver initialized\n", rev);
964
965 return 0;
966 }
967
ab8500_usb_remove(struct platform_device * pdev)968 static void ab8500_usb_remove(struct platform_device *pdev)
969 {
970 struct ab8500_usb *ab = platform_get_drvdata(pdev);
971
972 cancel_work_sync(&ab->phy_dis_work);
973
974 usb_remove_phy(&ab->phy);
975
976 if (ab->mode == USB_HOST)
977 ab8500_usb_host_phy_dis(ab);
978 else if (ab->mode == USB_PERIPHERAL)
979 ab8500_usb_peri_phy_dis(ab);
980 }
981
982 static const struct platform_device_id ab8500_usb_devtype[] = {
983 { .name = "ab8500-usb", },
984 { /* sentinel */ }
985 };
986 MODULE_DEVICE_TABLE(platform, ab8500_usb_devtype);
987
988 static struct platform_driver ab8500_usb_driver = {
989 .probe = ab8500_usb_probe,
990 .remove_new = ab8500_usb_remove,
991 .id_table = ab8500_usb_devtype,
992 .driver = {
993 .name = "abx5x0-usb",
994 },
995 };
996
ab8500_usb_init(void)997 static int __init ab8500_usb_init(void)
998 {
999 return platform_driver_register(&ab8500_usb_driver);
1000 }
1001 subsys_initcall(ab8500_usb_init);
1002
ab8500_usb_exit(void)1003 static void __exit ab8500_usb_exit(void)
1004 {
1005 platform_driver_unregister(&ab8500_usb_driver);
1006 }
1007 module_exit(ab8500_usb_exit);
1008
1009 MODULE_AUTHOR("ST-Ericsson AB");
1010 MODULE_DESCRIPTION("AB8500 family usb transceiver driver");
1011 MODULE_LICENSE("GPL");
1012