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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-05 18:18:00 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-05 18:18:00 -0400
commit64dc9e2e7320f079b97c46b106133b58b8e18d40 (patch)
treeab010dc1337d44e29c2b32b7f11788620a91fe4f /drivers/usb/phy/phy-ab8500-usb.c
parent01a60e76b6392547ad3dca3ac05b9c886fa5da45 (diff)
parent9b192de60b5a584ee4ed967fb6758773c75e4643 (diff)
Merge tag 'usb-for-v3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next
Felipe writes: usb: patches for v3.10 merge window Here is the big Gadget & PHY pull request. Many of us have been really busy lately getting multiple drivers to a better position. Since this pull request is so large, I will divide it in sections so it's easier to grasp what's included. - cleanups: . UDC drivers no longer touch gadget->dev, that's now udc-core responsibility . Many more UDC drivers converted to usb_gadget_map/unmap_request() . UDC drivers no longer initialize DMA-related fields from gadget's device structure . UDC drivers don't touch gadget.dev.driver directly . UDC drivers don't assign gadget.dev.release directly . Removal of some unused DMA_ADDR_INVALID . Introduction of CONFIG_USB_PHY . All phy drivers have been moved to drivers/usb/phy and renamed to a common naming scheme . Fix PHY layer so it never returns a NULL pointer, also fix all callers to avoid using IS_ERR_OR_NULL() . Sparse fixes all over the place . drivers/usb/otg/ has been deleted . Marvel drivers (mv_udc, ehci-mv, mv_otg and mv_u3d) improved clock usage - new features: . UDC core now provides a generic way for tracking and reporting UDC's state (not attached, resuming, suspended, addressed, default, etc) . twl4030-usb learned that it shouldn't be enabled during init . Full DT support for DWC3 has been implemented . ab8500-usb learned about pinctrl framework . nop PHY learned about DeviceTree and regulators . DWC3 learned about suspend/resume . DWC3 can now be compiled in host-only and gadget-only (as well as DRD) configurations . UVC now enables streaming endpoint based on negotiated speed . isp1301 now implements the PHY API properly . configfs-based interface for gadget drivers which will lead to the removal of all code which just combines functions together to build functional gadget drivers. . f_serial and f_obex were converted to new configfs interface while maintaining old interface around. - non-critical fixes: . UVC gadget driver got fixes for Endpoint usage and stream calculation . ab8500-usb fixed unbalanced clock and regulator API usage . twl4030-usb got a fix for when OMAP3 is booted with cable connected . fusb300_udc got a fix for DMA usage . UVC got fixes for two assertions of the USB Video Class Compliance specification revision 1.1 . build warning issues caused by recent addition of __must_check to regulator API These are all changes which deserve a mention, all other changes are related to these one or minor spelling fixes and other similar tasks. Signed-of-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/phy/phy-ab8500-usb.c')
-rw-r--r--drivers/usb/phy/phy-ab8500-usb.c924
1 files changed, 924 insertions, 0 deletions
diff --git a/drivers/usb/phy/phy-ab8500-usb.c b/drivers/usb/phy/phy-ab8500-usb.c
new file mode 100644
index 000000000000..4acef26a2ef5
--- /dev/null
+++ b/drivers/usb/phy/phy-ab8500-usb.c
@@ -0,0 +1,924 @@
1/*
2 * drivers/usb/otg/ab8500_usb.c
3 *
4 * USB transceiver driver for AB8500 chip
5 *
6 * Copyright (C) 2010 ST-Ericsson AB
7 * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *
23 */
24
25#include <linux/module.h>
26#include <linux/platform_device.h>
27#include <linux/usb/otg.h>
28#include <linux/slab.h>
29#include <linux/notifier.h>
30#include <linux/interrupt.h>
31#include <linux/delay.h>
32#include <linux/mfd/abx500.h>
33#include <linux/mfd/abx500/ab8500.h>
34#include <linux/usb/musb-ux500.h>
35#include <linux/regulator/consumer.h>
36#include <linux/pinctrl/consumer.h>
37
38/* Bank AB8500_SYS_CTRL2_BLOCK */
39#define AB8500_MAIN_WD_CTRL_REG 0x01
40
41/* Bank AB8500_USB */
42#define AB8500_USB_LINE_STAT_REG 0x80
43#define AB8505_USB_LINE_STAT_REG 0x94
44#define AB8500_USB_PHY_CTRL_REG 0x8A
45
46/* Bank AB8500_DEVELOPMENT */
47#define AB8500_BANK12_ACCESS 0x00
48
49/* Bank AB8500_DEBUG */
50#define AB8500_USB_PHY_TUNE1 0x05
51#define AB8500_USB_PHY_TUNE2 0x06
52#define AB8500_USB_PHY_TUNE3 0x07
53
54#define AB8500_BIT_OTG_STAT_ID (1 << 0)
55#define AB8500_BIT_PHY_CTRL_HOST_EN (1 << 0)
56#define AB8500_BIT_PHY_CTRL_DEVICE_EN (1 << 1)
57#define AB8500_BIT_WD_CTRL_ENABLE (1 << 0)
58#define AB8500_BIT_WD_CTRL_KICK (1 << 1)
59
60#define AB8500_WD_KICK_DELAY_US 100 /* usec */
61#define AB8500_WD_V11_DISABLE_DELAY_US 100 /* usec */
62#define AB8500_V20_31952_DISABLE_DELAY_US 100 /* usec */
63
64/* Usb line status register */
65enum ab8500_usb_link_status {
66 USB_LINK_NOT_CONFIGURED_8500 = 0,
67 USB_LINK_STD_HOST_NC_8500,
68 USB_LINK_STD_HOST_C_NS_8500,
69 USB_LINK_STD_HOST_C_S_8500,
70 USB_LINK_HOST_CHG_NM_8500,
71 USB_LINK_HOST_CHG_HS_8500,
72 USB_LINK_HOST_CHG_HS_CHIRP_8500,
73 USB_LINK_DEDICATED_CHG_8500,
74 USB_LINK_ACA_RID_A_8500,
75 USB_LINK_ACA_RID_B_8500,
76 USB_LINK_ACA_RID_C_NM_8500,
77 USB_LINK_ACA_RID_C_HS_8500,
78 USB_LINK_ACA_RID_C_HS_CHIRP_8500,
79 USB_LINK_HM_IDGND_8500,
80 USB_LINK_RESERVED_8500,
81 USB_LINK_NOT_VALID_LINK_8500,
82};
83
84enum ab8505_usb_link_status {
85 USB_LINK_NOT_CONFIGURED_8505 = 0,
86 USB_LINK_STD_HOST_NC_8505,
87 USB_LINK_STD_HOST_C_NS_8505,
88 USB_LINK_STD_HOST_C_S_8505,
89 USB_LINK_CDP_8505,
90 USB_LINK_RESERVED0_8505,
91 USB_LINK_RESERVED1_8505,
92 USB_LINK_DEDICATED_CHG_8505,
93 USB_LINK_ACA_RID_A_8505,
94 USB_LINK_ACA_RID_B_8505,
95 USB_LINK_ACA_RID_C_NM_8505,
96 USB_LINK_RESERVED2_8505,
97 USB_LINK_RESERVED3_8505,
98 USB_LINK_HM_IDGND_8505,
99 USB_LINK_CHARGERPORT_NOT_OK_8505,
100 USB_LINK_CHARGER_DM_HIGH_8505,
101 USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8505,
102 USB_LINK_STD_UPSTREAM_NO_IDGNG_NO_VBUS_8505,
103 USB_LINK_STD_UPSTREAM_8505,
104 USB_LINK_CHARGER_SE1_8505,
105 USB_LINK_CARKIT_CHGR_1_8505,
106 USB_LINK_CARKIT_CHGR_2_8505,
107 USB_LINK_ACA_DOCK_CHGR_8505,
108 USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_8505,
109 USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_8505,
110 USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8505,
111 USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8505,
112 USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8505,
113};
114
115enum ab8500_usb_mode {
116 USB_IDLE = 0,
117 USB_PERIPHERAL,
118 USB_HOST,
119 USB_DEDICATED_CHG
120};
121
122struct ab8500_usb {
123 struct usb_phy phy;
124 struct device *dev;
125 struct ab8500 *ab8500;
126 unsigned vbus_draw;
127 struct work_struct phy_dis_work;
128 enum ab8500_usb_mode mode;
129 struct regulator *v_ape;
130 struct regulator *v_musb;
131 struct regulator *v_ulpi;
132 int saved_v_ulpi;
133 int previous_link_status_state;
134 struct pinctrl *pinctrl;
135 struct pinctrl_state *pins_sleep;
136};
137
138static inline struct ab8500_usb *phy_to_ab(struct usb_phy *x)
139{
140 return container_of(x, struct ab8500_usb, phy);
141}
142
143static void ab8500_usb_wd_workaround(struct ab8500_usb *ab)
144{
145 abx500_set_register_interruptible(ab->dev,
146 AB8500_SYS_CTRL2_BLOCK,
147 AB8500_MAIN_WD_CTRL_REG,
148 AB8500_BIT_WD_CTRL_ENABLE);
149
150 udelay(AB8500_WD_KICK_DELAY_US);
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 | AB8500_BIT_WD_CTRL_KICK));
157
158 udelay(AB8500_WD_V11_DISABLE_DELAY_US);
159
160 abx500_set_register_interruptible(ab->dev,
161 AB8500_SYS_CTRL2_BLOCK,
162 AB8500_MAIN_WD_CTRL_REG,
163 0);
164}
165
166static void ab8500_usb_regulator_enable(struct ab8500_usb *ab)
167{
168 int ret, volt;
169
170 ret = regulator_enable(ab->v_ape);
171 if (ret)
172 dev_err(ab->dev, "Failed to enable v-ape\n");
173
174 if (!is_ab8500_2p0_or_earlier(ab->ab8500)) {
175 ab->saved_v_ulpi = regulator_get_voltage(ab->v_ulpi);
176 if (ab->saved_v_ulpi < 0)
177 dev_err(ab->dev, "Failed to get v_ulpi voltage\n");
178
179 ret = regulator_set_voltage(ab->v_ulpi, 1300000, 1350000);
180 if (ret < 0)
181 dev_err(ab->dev, "Failed to set the Vintcore to 1.3V, ret=%d\n",
182 ret);
183
184 ret = regulator_set_optimum_mode(ab->v_ulpi, 28000);
185 if (ret < 0)
186 dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
187 ret);
188 }
189
190 ret = regulator_enable(ab->v_ulpi);
191 if (ret)
192 dev_err(ab->dev, "Failed to enable vddulpivio18\n");
193
194 if (!is_ab8500_2p0_or_earlier(ab->ab8500)) {
195 volt = regulator_get_voltage(ab->v_ulpi);
196 if ((volt != 1300000) && (volt != 1350000))
197 dev_err(ab->dev, "Vintcore is not set to 1.3V volt=%d\n",
198 volt);
199 }
200
201 ret = regulator_enable(ab->v_musb);
202 if (ret)
203 dev_err(ab->dev, "Failed to enable musb_1v8\n");
204}
205
206static void ab8500_usb_regulator_disable(struct ab8500_usb *ab)
207{
208 int ret;
209
210 regulator_disable(ab->v_musb);
211
212 regulator_disable(ab->v_ulpi);
213
214 /* USB is not the only consumer of Vintcore, restore old settings */
215 if (!is_ab8500_2p0_or_earlier(ab->ab8500)) {
216 if (ab->saved_v_ulpi > 0) {
217 ret = regulator_set_voltage(ab->v_ulpi,
218 ab->saved_v_ulpi, ab->saved_v_ulpi);
219 if (ret < 0)
220 dev_err(ab->dev, "Failed to set the Vintcore to %duV, ret=%d\n",
221 ab->saved_v_ulpi, ret);
222 }
223
224 ret = regulator_set_optimum_mode(ab->v_ulpi, 0);
225 if (ret < 0)
226 dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
227 ret);
228 }
229
230 regulator_disable(ab->v_ape);
231}
232
233static void ab8500_usb_wd_linkstatus(struct ab8500_usb *ab, u8 bit)
234{
235 /* Workaround for v2.0 bug # 31952 */
236 if (is_ab8500_2p0(ab->ab8500)) {
237 abx500_mask_and_set_register_interruptible(ab->dev,
238 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
239 bit, bit);
240 udelay(AB8500_V20_31952_DISABLE_DELAY_US);
241 }
242}
243
244static void ab8500_usb_phy_enable(struct ab8500_usb *ab, bool sel_host)
245{
246 u8 bit;
247 bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
248 AB8500_BIT_PHY_CTRL_DEVICE_EN;
249
250 /* mux and configure USB pins to DEFAULT state */
251 ab->pinctrl = pinctrl_get_select(ab->dev, PINCTRL_STATE_DEFAULT);
252 if (IS_ERR(ab->pinctrl))
253 dev_err(ab->dev, "could not get/set default pinstate\n");
254
255 ab8500_usb_regulator_enable(ab);
256
257 abx500_mask_and_set_register_interruptible(ab->dev,
258 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
259 bit, bit);
260}
261
262static void ab8500_usb_phy_disable(struct ab8500_usb *ab, bool sel_host)
263{
264 u8 bit;
265 bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
266 AB8500_BIT_PHY_CTRL_DEVICE_EN;
267
268 ab8500_usb_wd_linkstatus(ab, bit);
269
270 abx500_mask_and_set_register_interruptible(ab->dev,
271 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
272 bit, 0);
273
274 /* Needed to disable the phy.*/
275 ab8500_usb_wd_workaround(ab);
276
277 ab8500_usb_regulator_disable(ab);
278
279 if (!IS_ERR(ab->pinctrl)) {
280 /* configure USB pins to SLEEP state */
281 ab->pins_sleep = pinctrl_lookup_state(ab->pinctrl,
282 PINCTRL_STATE_SLEEP);
283
284 if (IS_ERR(ab->pins_sleep))
285 dev_dbg(ab->dev, "could not get sleep pinstate\n");
286 else if (pinctrl_select_state(ab->pinctrl, ab->pins_sleep))
287 dev_err(ab->dev, "could not set pins to sleep state\n");
288
289 /* as USB pins are shared with idddet, release them to allow
290 * iddet to request them
291 */
292 pinctrl_put(ab->pinctrl);
293 }
294}
295
296#define ab8500_usb_host_phy_en(ab) ab8500_usb_phy_enable(ab, true)
297#define ab8500_usb_host_phy_dis(ab) ab8500_usb_phy_disable(ab, true)
298#define ab8500_usb_peri_phy_en(ab) ab8500_usb_phy_enable(ab, false)
299#define ab8500_usb_peri_phy_dis(ab) ab8500_usb_phy_disable(ab, false)
300
301static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
302 enum ab8505_usb_link_status lsts)
303{
304 enum ux500_musb_vbus_id_status event = 0;
305
306 dev_dbg(ab->dev, "ab8505_usb_link_status_update %d\n", lsts);
307
308 /*
309 * Spurious link_status interrupts are seen at the time of
310 * disconnection of a device in RIDA state
311 */
312 if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8505 &&
313 (lsts == USB_LINK_STD_HOST_NC_8505))
314 return 0;
315
316 ab->previous_link_status_state = lsts;
317
318 switch (lsts) {
319 case USB_LINK_ACA_RID_B_8505:
320 event = UX500_MUSB_RIDB;
321 case USB_LINK_NOT_CONFIGURED_8505:
322 case USB_LINK_RESERVED0_8505:
323 case USB_LINK_RESERVED1_8505:
324 case USB_LINK_RESERVED2_8505:
325 case USB_LINK_RESERVED3_8505:
326 ab->mode = USB_IDLE;
327 ab->phy.otg->default_a = false;
328 ab->vbus_draw = 0;
329 if (event != UX500_MUSB_RIDB)
330 event = UX500_MUSB_NONE;
331 /*
332 * Fallback to default B_IDLE as nothing
333 * is connected
334 */
335 ab->phy.state = OTG_STATE_B_IDLE;
336 break;
337
338 case USB_LINK_ACA_RID_C_NM_8505:
339 event = UX500_MUSB_RIDC;
340 case USB_LINK_STD_HOST_NC_8505:
341 case USB_LINK_STD_HOST_C_NS_8505:
342 case USB_LINK_STD_HOST_C_S_8505:
343 case USB_LINK_CDP_8505:
344 if (ab->mode == USB_IDLE) {
345 ab->mode = USB_PERIPHERAL;
346 ab8500_usb_peri_phy_en(ab);
347 atomic_notifier_call_chain(&ab->phy.notifier,
348 UX500_MUSB_PREPARE, &ab->vbus_draw);
349 }
350 if (event != UX500_MUSB_RIDC)
351 event = UX500_MUSB_VBUS;
352 break;
353
354 case USB_LINK_ACA_RID_A_8505:
355 case USB_LINK_ACA_DOCK_CHGR_8505:
356 event = UX500_MUSB_RIDA;
357 case USB_LINK_HM_IDGND_8505:
358 if (ab->mode == USB_IDLE) {
359 ab->mode = USB_HOST;
360 ab8500_usb_host_phy_en(ab);
361 atomic_notifier_call_chain(&ab->phy.notifier,
362 UX500_MUSB_PREPARE, &ab->vbus_draw);
363 }
364 ab->phy.otg->default_a = true;
365 if (event != UX500_MUSB_RIDA)
366 event = UX500_MUSB_ID;
367 atomic_notifier_call_chain(&ab->phy.notifier,
368 event, &ab->vbus_draw);
369 break;
370
371 case USB_LINK_DEDICATED_CHG_8505:
372 ab->mode = USB_DEDICATED_CHG;
373 event = UX500_MUSB_CHARGER;
374 atomic_notifier_call_chain(&ab->phy.notifier,
375 event, &ab->vbus_draw);
376 break;
377
378 default:
379 break;
380 }
381
382 return 0;
383}
384
385static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
386 enum ab8500_usb_link_status lsts)
387{
388 enum ux500_musb_vbus_id_status event = 0;
389
390 dev_dbg(ab->dev, "ab8500_usb_link_status_update %d\n", lsts);
391
392 /*
393 * Spurious link_status interrupts are seen in case of a
394 * disconnection of a device in IDGND and RIDA stage
395 */
396 if (ab->previous_link_status_state == USB_LINK_HM_IDGND_8500 &&
397 (lsts == USB_LINK_STD_HOST_C_NS_8500 ||
398 lsts == USB_LINK_STD_HOST_NC_8500))
399 return 0;
400
401 if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8500 &&
402 lsts == USB_LINK_STD_HOST_NC_8500)
403 return 0;
404
405 ab->previous_link_status_state = lsts;
406
407 switch (lsts) {
408 case USB_LINK_ACA_RID_B_8500:
409 event = UX500_MUSB_RIDB;
410 case USB_LINK_NOT_CONFIGURED_8500:
411 case USB_LINK_NOT_VALID_LINK_8500:
412 ab->mode = USB_IDLE;
413 ab->phy.otg->default_a = false;
414 ab->vbus_draw = 0;
415 if (event != UX500_MUSB_RIDB)
416 event = UX500_MUSB_NONE;
417 /* Fallback to default B_IDLE as nothing is connected */
418 ab->phy.state = OTG_STATE_B_IDLE;
419 break;
420
421 case USB_LINK_ACA_RID_C_NM_8500:
422 case USB_LINK_ACA_RID_C_HS_8500:
423 case USB_LINK_ACA_RID_C_HS_CHIRP_8500:
424 event = UX500_MUSB_RIDC;
425 case USB_LINK_STD_HOST_NC_8500:
426 case USB_LINK_STD_HOST_C_NS_8500:
427 case USB_LINK_STD_HOST_C_S_8500:
428 case USB_LINK_HOST_CHG_NM_8500:
429 case USB_LINK_HOST_CHG_HS_8500:
430 case USB_LINK_HOST_CHG_HS_CHIRP_8500:
431 if (ab->mode == USB_IDLE) {
432 ab->mode = USB_PERIPHERAL;
433 ab8500_usb_peri_phy_en(ab);
434 atomic_notifier_call_chain(&ab->phy.notifier,
435 UX500_MUSB_PREPARE, &ab->vbus_draw);
436 }
437 if (event != UX500_MUSB_RIDC)
438 event = UX500_MUSB_VBUS;
439 break;
440
441 case USB_LINK_ACA_RID_A_8500:
442 event = UX500_MUSB_RIDA;
443 case USB_LINK_HM_IDGND_8500:
444 if (ab->mode == USB_IDLE) {
445 ab->mode = USB_HOST;
446 ab8500_usb_host_phy_en(ab);
447 atomic_notifier_call_chain(&ab->phy.notifier,
448 UX500_MUSB_PREPARE, &ab->vbus_draw);
449 }
450 ab->phy.otg->default_a = true;
451 if (event != UX500_MUSB_RIDA)
452 event = UX500_MUSB_ID;
453 atomic_notifier_call_chain(&ab->phy.notifier,
454 event, &ab->vbus_draw);
455 break;
456
457 case USB_LINK_DEDICATED_CHG_8500:
458 ab->mode = USB_DEDICATED_CHG;
459 event = UX500_MUSB_CHARGER;
460 atomic_notifier_call_chain(&ab->phy.notifier,
461 event, &ab->vbus_draw);
462 break;
463
464 case USB_LINK_RESERVED_8500:
465 break;
466 }
467
468 return 0;
469}
470
471/*
472 * Connection Sequence:
473 * 1. Link Status Interrupt
474 * 2. Enable AB clock
475 * 3. Enable AB regulators
476 * 4. Enable USB phy
477 * 5. Reset the musb controller
478 * 6. Switch the ULPI GPIO pins to fucntion mode
479 * 7. Enable the musb Peripheral5 clock
480 * 8. Restore MUSB context
481 */
482static int abx500_usb_link_status_update(struct ab8500_usb *ab)
483{
484 u8 reg;
485 int ret = 0;
486
487 if (is_ab8500(ab->ab8500)) {
488 enum ab8500_usb_link_status lsts;
489
490 abx500_get_register_interruptible(ab->dev,
491 AB8500_USB, AB8500_USB_LINE_STAT_REG, &reg);
492 lsts = (reg >> 3) & 0x0F;
493 ret = ab8500_usb_link_status_update(ab, lsts);
494 } else if (is_ab8505(ab->ab8500)) {
495 enum ab8505_usb_link_status lsts;
496
497 abx500_get_register_interruptible(ab->dev,
498 AB8500_USB, AB8505_USB_LINE_STAT_REG, &reg);
499 lsts = (reg >> 3) & 0x1F;
500 ret = ab8505_usb_link_status_update(ab, lsts);
501 }
502
503 return ret;
504}
505
506/*
507 * Disconnection Sequence:
508 * 1. Disconect Interrupt
509 * 2. Disable regulators
510 * 3. Disable AB clock
511 * 4. Disable the Phy
512 * 5. Link Status Interrupt
513 * 6. Disable Musb Clock
514 */
515static irqreturn_t ab8500_usb_disconnect_irq(int irq, void *data)
516{
517 struct ab8500_usb *ab = (struct ab8500_usb *) data;
518 enum usb_phy_events event = UX500_MUSB_NONE;
519
520 /* Link status will not be updated till phy is disabled. */
521 if (ab->mode == USB_HOST) {
522 ab->phy.otg->default_a = false;
523 ab->vbus_draw = 0;
524 atomic_notifier_call_chain(&ab->phy.notifier,
525 event, &ab->vbus_draw);
526 ab8500_usb_host_phy_dis(ab);
527 ab->mode = USB_IDLE;
528 }
529
530 if (ab->mode == USB_PERIPHERAL) {
531 atomic_notifier_call_chain(&ab->phy.notifier,
532 event, &ab->vbus_draw);
533 ab8500_usb_peri_phy_dis(ab);
534 atomic_notifier_call_chain(&ab->phy.notifier,
535 UX500_MUSB_CLEAN, &ab->vbus_draw);
536 ab->mode = USB_IDLE;
537 ab->phy.otg->default_a = false;
538 ab->vbus_draw = 0;
539 }
540
541 if (is_ab8500_2p0(ab->ab8500)) {
542 if (ab->mode == USB_DEDICATED_CHG) {
543 ab8500_usb_wd_linkstatus(ab,
544 AB8500_BIT_PHY_CTRL_DEVICE_EN);
545 abx500_mask_and_set_register_interruptible(ab->dev,
546 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
547 AB8500_BIT_PHY_CTRL_DEVICE_EN, 0);
548 }
549 }
550
551 return IRQ_HANDLED;
552}
553
554static irqreturn_t ab8500_usb_link_status_irq(int irq, void *data)
555{
556 struct ab8500_usb *ab = (struct ab8500_usb *) data;
557
558 abx500_usb_link_status_update(ab);
559
560 return IRQ_HANDLED;
561}
562
563static void ab8500_usb_phy_disable_work(struct work_struct *work)
564{
565 struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
566 phy_dis_work);
567
568 if (!ab->phy.otg->host)
569 ab8500_usb_host_phy_dis(ab);
570
571 if (!ab->phy.otg->gadget)
572 ab8500_usb_peri_phy_dis(ab);
573}
574
575static unsigned ab8500_eyediagram_workaroud(struct ab8500_usb *ab, unsigned mA)
576{
577 /*
578 * AB8500 V2 has eye diagram issues when drawing more than 100mA from
579 * VBUS. Set charging current to 100mA in case of standard host
580 */
581 if (is_ab8500_2p0_or_earlier(ab->ab8500))
582 if (mA > 100)
583 mA = 100;
584
585 return mA;
586}
587
588static int ab8500_usb_set_power(struct usb_phy *phy, unsigned mA)
589{
590 struct ab8500_usb *ab;
591
592 if (!phy)
593 return -ENODEV;
594
595 ab = phy_to_ab(phy);
596
597 mA = ab8500_eyediagram_workaroud(ab, mA);
598
599 ab->vbus_draw = mA;
600
601 atomic_notifier_call_chain(&ab->phy.notifier,
602 UX500_MUSB_VBUS, &ab->vbus_draw);
603
604 return 0;
605}
606
607static int ab8500_usb_set_suspend(struct usb_phy *x, int suspend)
608{
609 /* TODO */
610 return 0;
611}
612
613static int ab8500_usb_set_peripheral(struct usb_otg *otg,
614 struct usb_gadget *gadget)
615{
616 struct ab8500_usb *ab;
617
618 if (!otg)
619 return -ENODEV;
620
621 ab = phy_to_ab(otg->phy);
622
623 ab->phy.otg->gadget = gadget;
624
625 /* Some drivers call this function in atomic context.
626 * Do not update ab8500 registers directly till this
627 * is fixed.
628 */
629
630 if ((ab->mode != USB_IDLE) && (!gadget)) {
631 ab->mode = USB_IDLE;
632 schedule_work(&ab->phy_dis_work);
633 }
634
635 return 0;
636}
637
638static int ab8500_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
639{
640 struct ab8500_usb *ab;
641
642 if (!otg)
643 return -ENODEV;
644
645 ab = phy_to_ab(otg->phy);
646
647 ab->phy.otg->host = host;
648
649 /* Some drivers call this function in atomic context.
650 * Do not update ab8500 registers directly till this
651 * is fixed.
652 */
653
654 if ((ab->mode != USB_IDLE) && (!host)) {
655 ab->mode = USB_IDLE;
656 schedule_work(&ab->phy_dis_work);
657 }
658
659 return 0;
660}
661
662static int ab8500_usb_regulator_get(struct ab8500_usb *ab)
663{
664 int err;
665
666 ab->v_ape = devm_regulator_get(ab->dev, "v-ape");
667 if (IS_ERR(ab->v_ape)) {
668 dev_err(ab->dev, "Could not get v-ape supply\n");
669 err = PTR_ERR(ab->v_ape);
670 return err;
671 }
672
673 ab->v_ulpi = devm_regulator_get(ab->dev, "vddulpivio18");
674 if (IS_ERR(ab->v_ulpi)) {
675 dev_err(ab->dev, "Could not get vddulpivio18 supply\n");
676 err = PTR_ERR(ab->v_ulpi);
677 return err;
678 }
679
680 ab->v_musb = devm_regulator_get(ab->dev, "musb_1v8");
681 if (IS_ERR(ab->v_musb)) {
682 dev_err(ab->dev, "Could not get musb_1v8 supply\n");
683 err = PTR_ERR(ab->v_musb);
684 return err;
685 }
686
687 return 0;
688}
689
690static int ab8500_usb_irq_setup(struct platform_device *pdev,
691 struct ab8500_usb *ab)
692{
693 int err;
694 int irq;
695
696 irq = platform_get_irq_byname(pdev, "USB_LINK_STATUS");
697 if (irq < 0) {
698 dev_err(&pdev->dev, "Link status irq not found\n");
699 return irq;
700 }
701 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
702 ab8500_usb_link_status_irq,
703 IRQF_NO_SUSPEND | IRQF_SHARED, "usb-link-status", ab);
704 if (err < 0) {
705 dev_err(ab->dev, "request_irq failed for link status irq\n");
706 return err;
707 }
708
709 irq = platform_get_irq_byname(pdev, "ID_WAKEUP_F");
710 if (irq < 0) {
711 dev_err(&pdev->dev, "ID fall irq not found\n");
712 return irq;
713 }
714 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
715 ab8500_usb_disconnect_irq,
716 IRQF_NO_SUSPEND | IRQF_SHARED, "usb-id-fall", ab);
717 if (err < 0) {
718 dev_err(ab->dev, "request_irq failed for ID fall irq\n");
719 return err;
720 }
721
722 irq = platform_get_irq_byname(pdev, "VBUS_DET_F");
723 if (irq < 0) {
724 dev_err(&pdev->dev, "VBUS fall irq not found\n");
725 return irq;
726 }
727 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
728 ab8500_usb_disconnect_irq,
729 IRQF_NO_SUSPEND | IRQF_SHARED, "usb-vbus-fall", ab);
730 if (err < 0) {
731 dev_err(ab->dev, "request_irq failed for Vbus fall irq\n");
732 return err;
733 }
734
735 return 0;
736}
737
738static int ab8500_usb_probe(struct platform_device *pdev)
739{
740 struct ab8500_usb *ab;
741 struct ab8500 *ab8500;
742 struct usb_otg *otg;
743 int err;
744 int rev;
745
746 ab8500 = dev_get_drvdata(pdev->dev.parent);
747 rev = abx500_get_chip_id(&pdev->dev);
748
749 if (is_ab8500_1p1_or_earlier(ab8500)) {
750 dev_err(&pdev->dev, "Unsupported AB8500 chip rev=%d\n", rev);
751 return -ENODEV;
752 }
753
754 ab = devm_kzalloc(&pdev->dev, sizeof(*ab), GFP_KERNEL);
755 if (!ab)
756 return -ENOMEM;
757
758 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
759 if (!otg)
760 return -ENOMEM;
761
762 ab->dev = &pdev->dev;
763 ab->ab8500 = ab8500;
764 ab->phy.dev = ab->dev;
765 ab->phy.otg = otg;
766 ab->phy.label = "ab8500";
767 ab->phy.set_suspend = ab8500_usb_set_suspend;
768 ab->phy.set_power = ab8500_usb_set_power;
769 ab->phy.state = OTG_STATE_UNDEFINED;
770
771 otg->phy = &ab->phy;
772 otg->set_host = ab8500_usb_set_host;
773 otg->set_peripheral = ab8500_usb_set_peripheral;
774
775 platform_set_drvdata(pdev, ab);
776
777 ATOMIC_INIT_NOTIFIER_HEAD(&ab->phy.notifier);
778
779 /* all: Disable phy when called from set_host and set_peripheral */
780 INIT_WORK(&ab->phy_dis_work, ab8500_usb_phy_disable_work);
781
782 err = ab8500_usb_regulator_get(ab);
783 if (err)
784 return err;
785
786 err = ab8500_usb_irq_setup(pdev, ab);
787 if (err < 0)
788 return err;
789
790 err = usb_add_phy(&ab->phy, USB_PHY_TYPE_USB2);
791 if (err) {
792 dev_err(&pdev->dev, "Can't register transceiver\n");
793 return err;
794 }
795
796 /* Phy tuning values for AB8500 */
797 if (!is_ab8500_2p0_or_earlier(ab->ab8500)) {
798 /* Enable the PBT/Bank 0x12 access */
799 err = abx500_set_register_interruptible(ab->dev,
800 AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x01);
801 if (err < 0)
802 dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
803 err);
804
805 err = abx500_set_register_interruptible(ab->dev,
806 AB8500_DEBUG, AB8500_USB_PHY_TUNE1, 0xC8);
807 if (err < 0)
808 dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
809 err);
810
811 err = abx500_set_register_interruptible(ab->dev,
812 AB8500_DEBUG, AB8500_USB_PHY_TUNE2, 0x00);
813 if (err < 0)
814 dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
815 err);
816
817 err = abx500_set_register_interruptible(ab->dev,
818 AB8500_DEBUG, AB8500_USB_PHY_TUNE3, 0x78);
819 if (err < 0)
820 dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
821 err);
822
823 /* Switch to normal mode/disable Bank 0x12 access */
824 err = abx500_set_register_interruptible(ab->dev,
825 AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x00);
826 if (err < 0)
827 dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
828 err);
829 }
830
831 /* Phy tuning values for AB8505 */
832 if (is_ab8505(ab->ab8500)) {
833 /* Enable the PBT/Bank 0x12 access */
834 err = abx500_mask_and_set_register_interruptible(ab->dev,
835 AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
836 0x01, 0x01);
837 if (err < 0)
838 dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
839 err);
840
841 err = abx500_mask_and_set_register_interruptible(ab->dev,
842 AB8500_DEBUG, AB8500_USB_PHY_TUNE1,
843 0xC8, 0xC8);
844 if (err < 0)
845 dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
846 err);
847
848 err = abx500_mask_and_set_register_interruptible(ab->dev,
849 AB8500_DEBUG, AB8500_USB_PHY_TUNE2,
850 0x60, 0x60);
851 if (err < 0)
852 dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
853 err);
854
855 err = abx500_mask_and_set_register_interruptible(ab->dev,
856 AB8500_DEBUG, AB8500_USB_PHY_TUNE3,
857 0xFC, 0x80);
858
859 if (err < 0)
860 dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
861 err);
862
863 /* Switch to normal mode/disable Bank 0x12 access */
864 err = abx500_mask_and_set_register_interruptible(ab->dev,
865 AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
866 0x00, 0x00);
867 if (err < 0)
868 dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
869 err);
870 }
871
872 /* Needed to enable ID detection. */
873 ab8500_usb_wd_workaround(ab);
874
875 abx500_usb_link_status_update(ab);
876
877 dev_info(&pdev->dev, "revision 0x%2x driver initialized\n", rev);
878
879 return 0;
880}
881
882static int ab8500_usb_remove(struct platform_device *pdev)
883{
884 struct ab8500_usb *ab = platform_get_drvdata(pdev);
885
886 cancel_work_sync(&ab->phy_dis_work);
887
888 usb_remove_phy(&ab->phy);
889
890 if (ab->mode == USB_HOST)
891 ab8500_usb_host_phy_dis(ab);
892 else if (ab->mode == USB_PERIPHERAL)
893 ab8500_usb_peri_phy_dis(ab);
894
895 platform_set_drvdata(pdev, NULL);
896
897 return 0;
898}
899
900static struct platform_driver ab8500_usb_driver = {
901 .probe = ab8500_usb_probe,
902 .remove = ab8500_usb_remove,
903 .driver = {
904 .name = "ab8500-usb",
905 .owner = THIS_MODULE,
906 },
907};
908
909static int __init ab8500_usb_init(void)
910{
911 return platform_driver_register(&ab8500_usb_driver);
912}
913subsys_initcall(ab8500_usb_init);
914
915static void __exit ab8500_usb_exit(void)
916{
917 platform_driver_unregister(&ab8500_usb_driver);
918}
919module_exit(ab8500_usb_exit);
920
921MODULE_ALIAS("platform:ab8500_usb");
922MODULE_AUTHOR("ST-Ericsson AB");
923MODULE_DESCRIPTION("AB8500 usb transceiver driver");
924MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-28 14:46:24 -0500