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Greg Kroah-Hartman5fd54ac2017-11-03 11:28:30 +01001// SPDX-License-Identifier: GPL-1.0+
Kuninori Morimotof1407d52011-04-04 13:44:59 +09002/*
3 * Renesas USB driver
4 *
5 * Copyright (C) 2011 Renesas Solutions Corp.
Yoshihiro Shimoda09666482019-06-25 14:38:46 +09006 * Copyright (C) 2019 Renesas Electronics Corporation
Kuninori Morimotof1407d52011-04-04 13:44:59 +09007 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Kuninori Morimotof1407d52011-04-04 13:44:59 +09008 */
9#include <linux/interrupt.h>
10
Paul Bollecc502bb2012-06-03 18:39:13 +020011#include "common.h"
12#include "mod.h"
Kuninori Morimotof1407d52011-04-04 13:44:59 +090013
Kuninori Morimotob002ff62011-04-28 16:41:20 +090014/*
15 * autonomy
16 *
17 * these functions are used if platform doesn't have external phy.
18 * -> there is no "notify_hotplug" callback from platform
19 * -> call "notify_hotplug" by itself
20 * -> use own interrupt to connect/disconnect
21 * -> it mean module clock is always ON
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~
23 */
24static int usbhsm_autonomy_get_vbus(struct platform_device *pdev)
25{
26 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
27
28 return VBSTS & usbhs_read(priv, INTSTS0);
29}
30
31static int usbhsm_autonomy_irq_vbus(struct usbhs_priv *priv,
32 struct usbhs_irq_state *irq_state)
33{
34 struct platform_device *pdev = usbhs_priv_to_pdev(priv);
35
Yoshihiro Shimoda09666482019-06-25 14:38:46 +090036 usbhsc_schedule_notify_hotplug(pdev);
Kuninori Morimotob4fcea22011-10-24 02:25:48 -070037
38 return 0;
Kuninori Morimotob002ff62011-04-28 16:41:20 +090039}
40
41void usbhs_mod_autonomy_mode(struct usbhs_priv *priv)
42{
43 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
44
Yoshihiro Shimodaccc32642019-06-25 14:38:48 +090045 info->irq_vbus = usbhsm_autonomy_irq_vbus;
46 info->get_vbus = usbhsm_autonomy_get_vbus;
Kuninori Morimotob002ff62011-04-28 16:41:20 +090047
48 usbhs_irq_callback_update(priv, NULL);
49}
Kuninori Morimotof1407d52011-04-04 13:44:59 +090050
Yoshihiro Shimodaccc32642019-06-25 14:38:48 +090051void usbhs_mod_non_autonomy_mode(struct usbhs_priv *priv)
52{
53 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
54
Yoshihiro Shimoda426d3ff2019-06-25 14:38:57 +090055 info->get_vbus = priv->pfunc->get_vbus;
Yoshihiro Shimodaccc32642019-06-25 14:38:48 +090056}
57
Kuninori Morimotof1407d52011-04-04 13:44:59 +090058/*
59 * host / gadget functions
60 *
61 * renesas_usbhs host/gadget can register itself by below functions.
62 * these functions are called when probe
63 *
64 */
65void usbhs_mod_register(struct usbhs_priv *priv, struct usbhs_mod *mod, int id)
66{
67 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
68
69 info->mod[id] = mod;
70 mod->priv = priv;
71}
72
73struct usbhs_mod *usbhs_mod_get(struct usbhs_priv *priv, int id)
74{
75 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
76 struct usbhs_mod *ret = NULL;
77
78 switch (id) {
79 case USBHS_HOST:
80 case USBHS_GADGET:
81 ret = info->mod[id];
82 break;
83 }
84
85 return ret;
86}
87
Kuninori Morimoto0deb3e72011-10-10 22:02:45 -070088int usbhs_mod_is_host(struct usbhs_priv *priv)
Kuninori Morimotof1407d52011-04-04 13:44:59 +090089{
Kuninori Morimoto0deb3e72011-10-10 22:02:45 -070090 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
Kuninori Morimotof1407d52011-04-04 13:44:59 +090091 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
92
93 if (!mod)
94 return -EINVAL;
95
96 return info->mod[USBHS_HOST] == mod;
97}
98
99struct usbhs_mod *usbhs_mod_get_current(struct usbhs_priv *priv)
100{
101 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
102
103 return info->curt;
104}
105
106int usbhs_mod_change(struct usbhs_priv *priv, int id)
107{
108 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
109 struct usbhs_mod *mod = NULL;
110 int ret = 0;
111
112 /* id < 0 mean no current */
113 switch (id) {
114 case USBHS_HOST:
115 case USBHS_GADGET:
116 mod = info->mod[id];
117 break;
118 default:
119 ret = -EINVAL;
120 }
121 info->curt = mod;
122
123 return ret;
124}
125
126static irqreturn_t usbhs_interrupt(int irq, void *data);
127int usbhs_mod_probe(struct usbhs_priv *priv)
128{
129 struct device *dev = usbhs_priv_to_dev(priv);
130 int ret;
131
Kuninori Morimoto2f983822011-04-05 11:40:54 +0900132 /*
133 * install host/gadget driver
134 */
Kuninori Morimoto034d7c12011-10-10 22:07:40 -0700135 ret = usbhs_mod_host_probe(priv);
Kuninori Morimoto2f983822011-04-05 11:40:54 +0900136 if (ret < 0)
137 return ret;
138
Kuninori Morimoto034d7c12011-10-10 22:07:40 -0700139 ret = usbhs_mod_gadget_probe(priv);
140 if (ret < 0)
141 goto mod_init_host_err;
142
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900143 /* irq settings */
Kuninori Morimoto797b4e12012-10-29 00:44:41 -0700144 ret = devm_request_irq(dev, priv->irq, usbhs_interrupt,
Shimoda, Yoshihiro53069af2012-01-05 15:37:18 +0900145 priv->irqflags, dev_name(dev), priv);
Kuninori Morimoto2f983822011-04-05 11:40:54 +0900146 if (ret) {
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900147 dev_err(dev, "irq request err\n");
Kuninori Morimoto2f983822011-04-05 11:40:54 +0900148 goto mod_init_gadget_err;
149 }
150
151 return ret;
152
153mod_init_gadget_err:
154 usbhs_mod_gadget_remove(priv);
Kuninori Morimoto034d7c12011-10-10 22:07:40 -0700155mod_init_host_err:
156 usbhs_mod_host_remove(priv);
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900157
158 return ret;
159}
160
161void usbhs_mod_remove(struct usbhs_priv *priv)
162{
Kuninori Morimoto034d7c12011-10-10 22:07:40 -0700163 usbhs_mod_host_remove(priv);
Kuninori Morimoto2f983822011-04-05 11:40:54 +0900164 usbhs_mod_gadget_remove(priv);
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900165}
166
167/*
168 * status functions
169 */
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900170int usbhs_status_get_device_state(struct usbhs_irq_state *irq_state)
171{
172 int state = irq_state->intsts0 & DVSQ_MASK;
173
174 switch (state) {
175 case POWER_STATE:
176 case DEFAULT_STATE:
177 case ADDRESS_STATE:
178 case CONFIGURATION_STATE:
179 return state;
180 }
181
182 return -EIO;
183}
184
185int usbhs_status_get_ctrl_stage(struct usbhs_irq_state *irq_state)
186{
187 /*
188 * return value
189 *
190 * IDLE_SETUP_STAGE
191 * READ_DATA_STAGE
192 * READ_STATUS_STAGE
193 * WRITE_DATA_STAGE
194 * WRITE_STATUS_STAGE
195 * NODATA_STATUS_STAGE
196 * SEQUENCE_ERROR
197 */
198 return (int)irq_state->intsts0 & CTSQ_MASK;
199}
200
Shimoda, Yoshihiro697d5c02012-08-20 18:39:23 +0900201static int usbhs_status_get_each_irq(struct usbhs_priv *priv,
202 struct usbhs_irq_state *state)
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900203{
204 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
Shimoda, Yoshihiro697d5c02012-08-20 18:39:23 +0900205 u16 intenb0, intenb1;
Yoshihiro Shimodac4d81992014-08-22 20:14:00 +0900206 unsigned long flags;
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900207
Yoshihiro Shimodac4d81992014-08-22 20:14:00 +0900208 /******************** spin lock ********************/
209 usbhs_lock(priv, flags);
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900210 state->intsts0 = usbhs_read(priv, INTSTS0);
Shimoda, Yoshihiro697d5c02012-08-20 18:39:23 +0900211 intenb0 = usbhs_read(priv, INTENB0);
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900212
213 if (usbhs_mod_is_host(priv)) {
214 state->intsts1 = usbhs_read(priv, INTSTS1);
215 intenb1 = usbhs_read(priv, INTENB1);
Arnd Bergmann672bfda2015-05-22 13:06:35 +0200216 } else {
217 state->intsts1 = intenb1 = 0;
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900218 }
Shimoda, Yoshihiro697d5c02012-08-20 18:39:23 +0900219
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900220 /* mask */
Kuninori Morimoto5ea68d52011-04-28 16:41:07 +0900221 if (mod) {
222 state->brdysts = usbhs_read(priv, BRDYSTS);
223 state->nrdysts = usbhs_read(priv, NRDYSTS);
224 state->bempsts = usbhs_read(priv, BEMPSTS);
225
226 state->bempsts &= mod->irq_bempsts;
227 state->brdysts &= mod->irq_brdysts;
228 }
Yoshihiro Shimodac4d81992014-08-22 20:14:00 +0900229 usbhs_unlock(priv, flags);
230 /******************** spin unlock ******************/
Shimoda, Yoshihiro697d5c02012-08-20 18:39:23 +0900231
232 /*
233 * Check whether the irq enable registers and the irq status are set
234 * when IRQF_SHARED is set.
235 */
236 if (priv->irqflags & IRQF_SHARED) {
237 if (!(intenb0 & state->intsts0) &&
238 !(intenb1 & state->intsts1) &&
239 !(state->bempsts) &&
240 !(state->brdysts))
241 return -EIO;
242 }
243
244 return 0;
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900245}
246
247/*
248 * interrupt
249 */
250#define INTSTS0_MAGIC 0xF800 /* acknowledge magical interrupt sources */
251#define INTSTS1_MAGIC 0xA870 /* acknowledge magical interrupt sources */
252static irqreturn_t usbhs_interrupt(int irq, void *data)
253{
254 struct usbhs_priv *priv = data;
255 struct usbhs_irq_state irq_state;
256
Shimoda, Yoshihiro697d5c02012-08-20 18:39:23 +0900257 if (usbhs_status_get_each_irq(priv, &irq_state) < 0)
258 return IRQ_NONE;
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900259
260 /*
261 * clear interrupt
262 *
263 * The hardware is _very_ picky to clear interrupt bit.
264 * Especially INTSTS0_MAGIC, INTSTS1_MAGIC value.
265 *
266 * see
267 * "Operation"
268 * - "Control Transfer (DCP)"
269 * - Function :: VALID bit should 0
270 */
271 usbhs_write(priv, INTSTS0, ~irq_state.intsts0 & INTSTS0_MAGIC);
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900272 if (usbhs_mod_is_host(priv))
273 usbhs_write(priv, INTSTS1, ~irq_state.intsts1 & INTSTS1_MAGIC);
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900274
Yoshihiro Shimoda519d8bd2016-08-29 18:00:38 +0900275 /*
276 * The driver should not clear the xxxSTS after the line of
277 * "call irq callback functions" because each "if" statement is
278 * possible to call the callback function for avoiding any side effects.
279 */
280 if (irq_state.intsts0 & BRDY)
281 usbhs_write(priv, BRDYSTS, ~irq_state.brdysts);
Kuninori Morimotod5c6a1e2012-10-11 21:49:38 -0700282 usbhs_write(priv, NRDYSTS, ~irq_state.nrdysts);
Yoshihiro Shimoda519d8bd2016-08-29 18:00:38 +0900283 if (irq_state.intsts0 & BEMP)
284 usbhs_write(priv, BEMPSTS, ~irq_state.bempsts);
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900285
286 /*
287 * call irq callback functions
288 * see also
289 * usbhs_irq_setting_update
290 */
Kuninori Morimoto89c1d2e2011-10-10 22:06:57 -0700291
292 /* INTSTS0 */
Kuninori Morimotob002ff62011-04-28 16:41:20 +0900293 if (irq_state.intsts0 & VBINT)
294 usbhs_mod_info_call(priv, irq_vbus, priv, &irq_state);
295
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900296 if (irq_state.intsts0 & DVST)
297 usbhs_mod_call(priv, irq_dev_state, priv, &irq_state);
298
299 if (irq_state.intsts0 & CTRT)
300 usbhs_mod_call(priv, irq_ctrl_stage, priv, &irq_state);
301
302 if (irq_state.intsts0 & BEMP)
303 usbhs_mod_call(priv, irq_empty, priv, &irq_state);
304
305 if (irq_state.intsts0 & BRDY)
306 usbhs_mod_call(priv, irq_ready, priv, &irq_state);
307
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900308 if (usbhs_mod_is_host(priv)) {
309 /* INTSTS1 */
310 if (irq_state.intsts1 & ATTCH)
311 usbhs_mod_call(priv, irq_attch, priv, &irq_state);
Kuninori Morimoto89c1d2e2011-10-10 22:06:57 -0700312
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900313 if (irq_state.intsts1 & DTCH)
314 usbhs_mod_call(priv, irq_dtch, priv, &irq_state);
Kuninori Morimoto89c1d2e2011-10-10 22:06:57 -0700315
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900316 if (irq_state.intsts1 & SIGN)
317 usbhs_mod_call(priv, irq_sign, priv, &irq_state);
Kuninori Morimoto89c1d2e2011-10-10 22:06:57 -0700318
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900319 if (irq_state.intsts1 & SACK)
320 usbhs_mod_call(priv, irq_sack, priv, &irq_state);
321 }
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900322 return IRQ_HANDLED;
323}
324
325void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod)
326{
327 u16 intenb0 = 0;
Kuninori Morimoto89c1d2e2011-10-10 22:06:57 -0700328 u16 intenb1 = 0;
Kuninori Morimotob002ff62011-04-28 16:41:20 +0900329 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900330
Kuninori Morimoto651f5e42011-10-10 22:01:15 -0700331 /*
332 * BEMPENB/BRDYENB are picky.
333 * below method is required
334 *
335 * - clear INTSTS0
336 * - update BEMPENB/BRDYENB
337 * - update INTSTS0
338 */
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900339 usbhs_write(priv, INTENB0, 0);
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900340 if (usbhs_mod_is_host(priv))
341 usbhs_write(priv, INTENB1, 0);
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900342
343 usbhs_write(priv, BEMPENB, 0);
344 usbhs_write(priv, BRDYENB, 0);
345
346 /*
347 * see also
348 * usbhs_interrupt
349 */
350
351 /*
352 * it don't enable DVSE (intenb0) here
353 * but "mod->irq_dev_state" will be called.
354 */
Kuninori Morimotob002ff62011-04-28 16:41:20 +0900355 if (info->irq_vbus)
356 intenb0 |= VBSE;
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900357
Kuninori Morimoto5ea68d52011-04-28 16:41:07 +0900358 if (mod) {
Kuninori Morimoto89c1d2e2011-10-10 22:06:57 -0700359 /*
360 * INTSTS0
361 */
Kuninori Morimoto5ea68d52011-04-28 16:41:07 +0900362 if (mod->irq_ctrl_stage)
363 intenb0 |= CTRE;
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900364
Kuninori Morimoto5ea68d52011-04-28 16:41:07 +0900365 if (mod->irq_empty && mod->irq_bempsts) {
366 usbhs_write(priv, BEMPENB, mod->irq_bempsts);
367 intenb0 |= BEMPE;
368 }
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900369
Kuninori Morimoto5ea68d52011-04-28 16:41:07 +0900370 if (mod->irq_ready && mod->irq_brdysts) {
371 usbhs_write(priv, BRDYENB, mod->irq_brdysts);
372 intenb0 |= BRDYE;
373 }
Kuninori Morimoto89c1d2e2011-10-10 22:06:57 -0700374
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900375 if (usbhs_mod_is_host(priv)) {
376 /*
377 * INTSTS1
378 */
379 if (mod->irq_attch)
380 intenb1 |= ATTCHE;
Kuninori Morimoto89c1d2e2011-10-10 22:06:57 -0700381
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900382 if (mod->irq_dtch)
383 intenb1 |= DTCHE;
Kuninori Morimoto89c1d2e2011-10-10 22:06:57 -0700384
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900385 if (mod->irq_sign)
386 intenb1 |= SIGNE;
Kuninori Morimoto89c1d2e2011-10-10 22:06:57 -0700387
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900388 if (mod->irq_sack)
389 intenb1 |= SACKE;
390 }
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900391 }
392
Kuninori Morimoto651f5e42011-10-10 22:01:15 -0700393 if (intenb0)
394 usbhs_write(priv, INTENB0, intenb0);
Kuninori Morimoto89c1d2e2011-10-10 22:06:57 -0700395
Nobuhiro Iwamatsu88a25e02015-01-09 09:28:41 +0900396 if (usbhs_mod_is_host(priv) && intenb1)
Kuninori Morimoto89c1d2e2011-10-10 22:06:57 -0700397 usbhs_write(priv, INTENB1, intenb1);
Kuninori Morimotof1407d52011-04-04 13:44:59 +0900398}