xref: /linux/drivers/usb/renesas_usbhs/mod.c (revision f2ee442115c9b6219083c019939a9cc0c9abb2f8)
1 /*
2  * Renesas USB driver
3  *
4  * Copyright (C) 2011 Renesas Solutions Corp.
5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10  * GNU General Public License for more details.
11  *
12  * You should have received a copy of the GNU General Public License
13  * along with this program; if not, write to the Free Software
14  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
15  *
16  */
17 #include <linux/interrupt.h>
18 
19 #include "./common.h"
20 #include "./mod.h"
21 
22 #define usbhs_priv_to_modinfo(priv) (&priv->mod_info)
23 #define usbhs_mod_info_call(priv, func, param...)	\
24 ({						\
25 	struct usbhs_mod_info *info;		\
26 	info = usbhs_priv_to_modinfo(priv);	\
27 	!info->func ? 0 :			\
28 	 info->func(param);			\
29 })
30 
31 /*
32  *		autonomy
33  *
34  * these functions are used if platform doesn't have external phy.
35  *  -> there is no "notify_hotplug" callback from platform
36  *  -> call "notify_hotplug" by itself
37  *  -> use own interrupt to connect/disconnect
38  *  -> it mean module clock is always ON
39  *             ~~~~~~~~~~~~~~~~~~~~~~~~~
40  */
41 static int usbhsm_autonomy_get_vbus(struct platform_device *pdev)
42 {
43 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
44 
45 	return  VBSTS & usbhs_read(priv, INTSTS0);
46 }
47 
48 static int usbhsm_autonomy_irq_vbus(struct usbhs_priv *priv,
49 				    struct usbhs_irq_state *irq_state)
50 {
51 	struct platform_device *pdev = usbhs_priv_to_pdev(priv);
52 
53 	return usbhsc_drvcllbck_notify_hotplug(pdev);
54 }
55 
56 void usbhs_mod_autonomy_mode(struct usbhs_priv *priv)
57 {
58 	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
59 
60 	info->irq_vbus		= usbhsm_autonomy_irq_vbus;
61 	priv->pfunc.get_vbus	= usbhsm_autonomy_get_vbus;
62 
63 	usbhs_irq_callback_update(priv, NULL);
64 }
65 
66 /*
67  *		host / gadget functions
68  *
69  * renesas_usbhs host/gadget can register itself by below functions.
70  * these functions are called when probe
71  *
72  */
73 void usbhs_mod_register(struct usbhs_priv *priv, struct usbhs_mod *mod, int id)
74 {
75 	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
76 
77 	info->mod[id]	= mod;
78 	mod->priv	= priv;
79 }
80 
81 struct usbhs_mod *usbhs_mod_get(struct usbhs_priv *priv, int id)
82 {
83 	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
84 	struct usbhs_mod *ret = NULL;
85 
86 	switch (id) {
87 	case USBHS_HOST:
88 	case USBHS_GADGET:
89 		ret = info->mod[id];
90 		break;
91 	}
92 
93 	return ret;
94 }
95 
96 int usbhs_mod_is_host(struct usbhs_priv *priv)
97 {
98 	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
99 	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
100 
101 	if (!mod)
102 		return -EINVAL;
103 
104 	return info->mod[USBHS_HOST] == mod;
105 }
106 
107 struct usbhs_mod *usbhs_mod_get_current(struct usbhs_priv *priv)
108 {
109 	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
110 
111 	return info->curt;
112 }
113 
114 int usbhs_mod_change(struct usbhs_priv *priv, int id)
115 {
116 	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
117 	struct usbhs_mod *mod = NULL;
118 	int ret = 0;
119 
120 	/* id < 0 mean no current */
121 	switch (id) {
122 	case USBHS_HOST:
123 	case USBHS_GADGET:
124 		mod = info->mod[id];
125 		break;
126 	default:
127 		ret = -EINVAL;
128 	}
129 	info->curt = mod;
130 
131 	return ret;
132 }
133 
134 static irqreturn_t usbhs_interrupt(int irq, void *data);
135 int usbhs_mod_probe(struct usbhs_priv *priv)
136 {
137 	struct device *dev = usbhs_priv_to_dev(priv);
138 	int ret;
139 
140 	/*
141 	 * install host/gadget driver
142 	 */
143 	ret = usbhs_mod_host_probe(priv);
144 	if (ret < 0)
145 		return ret;
146 
147 	ret = usbhs_mod_gadget_probe(priv);
148 	if (ret < 0)
149 		goto mod_init_host_err;
150 
151 	/* irq settings */
152 	ret = request_irq(priv->irq, usbhs_interrupt,
153 			  0, dev_name(dev), priv);
154 	if (ret) {
155 		dev_err(dev, "irq request err\n");
156 		goto mod_init_gadget_err;
157 	}
158 
159 	return ret;
160 
161 mod_init_gadget_err:
162 	usbhs_mod_gadget_remove(priv);
163 mod_init_host_err:
164 	usbhs_mod_host_remove(priv);
165 
166 	return ret;
167 }
168 
169 void usbhs_mod_remove(struct usbhs_priv *priv)
170 {
171 	usbhs_mod_host_remove(priv);
172 	usbhs_mod_gadget_remove(priv);
173 	free_irq(priv->irq, priv);
174 }
175 
176 /*
177  *		status functions
178  */
179 int usbhs_status_get_device_state(struct usbhs_irq_state *irq_state)
180 {
181 	int state = irq_state->intsts0 & DVSQ_MASK;
182 
183 	switch (state) {
184 	case POWER_STATE:
185 	case DEFAULT_STATE:
186 	case ADDRESS_STATE:
187 	case CONFIGURATION_STATE:
188 		return state;
189 	}
190 
191 	return -EIO;
192 }
193 
194 int usbhs_status_get_ctrl_stage(struct usbhs_irq_state *irq_state)
195 {
196 	/*
197 	 * return value
198 	 *
199 	 * IDLE_SETUP_STAGE
200 	 * READ_DATA_STAGE
201 	 * READ_STATUS_STAGE
202 	 * WRITE_DATA_STAGE
203 	 * WRITE_STATUS_STAGE
204 	 * NODATA_STATUS_STAGE
205 	 * SEQUENCE_ERROR
206 	 */
207 	return (int)irq_state->intsts0 & CTSQ_MASK;
208 }
209 
210 static void usbhs_status_get_each_irq(struct usbhs_priv *priv,
211 				      struct usbhs_irq_state *state)
212 {
213 	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
214 
215 	state->intsts0 = usbhs_read(priv, INTSTS0);
216 	state->intsts1 = usbhs_read(priv, INTSTS1);
217 
218 	/* mask */
219 	if (mod) {
220 		state->brdysts = usbhs_read(priv, BRDYSTS);
221 		state->nrdysts = usbhs_read(priv, NRDYSTS);
222 		state->bempsts = usbhs_read(priv, BEMPSTS);
223 
224 		state->bempsts &= mod->irq_bempsts;
225 		state->brdysts &= mod->irq_brdysts;
226 	}
227 }
228 
229 /*
230  *		interrupt
231  */
232 #define INTSTS0_MAGIC 0xF800 /* acknowledge magical interrupt sources */
233 #define INTSTS1_MAGIC 0xA870 /* acknowledge magical interrupt sources */
234 static irqreturn_t usbhs_interrupt(int irq, void *data)
235 {
236 	struct usbhs_priv *priv = data;
237 	struct usbhs_irq_state irq_state;
238 
239 	usbhs_status_get_each_irq(priv, &irq_state);
240 
241 	/*
242 	 * clear interrupt
243 	 *
244 	 * The hardware is _very_ picky to clear interrupt bit.
245 	 * Especially INTSTS0_MAGIC, INTSTS1_MAGIC value.
246 	 *
247 	 * see
248 	 *	"Operation"
249 	 *	 - "Control Transfer (DCP)"
250 	 *	   - Function :: VALID bit should 0
251 	 */
252 	usbhs_write(priv, INTSTS0, ~irq_state.intsts0 & INTSTS0_MAGIC);
253 	usbhs_write(priv, INTSTS1, ~irq_state.intsts1 & INTSTS1_MAGIC);
254 
255 	usbhs_write(priv, BRDYSTS, 0);
256 	usbhs_write(priv, NRDYSTS, 0);
257 	usbhs_write(priv, BEMPSTS, 0);
258 
259 	/*
260 	 * call irq callback functions
261 	 * see also
262 	 *	usbhs_irq_setting_update
263 	 */
264 
265 	/* INTSTS0 */
266 	if (irq_state.intsts0 & VBINT)
267 		usbhs_mod_info_call(priv, irq_vbus, priv, &irq_state);
268 
269 	if (irq_state.intsts0 & DVST)
270 		usbhs_mod_call(priv, irq_dev_state, priv, &irq_state);
271 
272 	if (irq_state.intsts0 & CTRT)
273 		usbhs_mod_call(priv, irq_ctrl_stage, priv, &irq_state);
274 
275 	if (irq_state.intsts0 & BEMP)
276 		usbhs_mod_call(priv, irq_empty, priv, &irq_state);
277 
278 	if (irq_state.intsts0 & BRDY)
279 		usbhs_mod_call(priv, irq_ready, priv, &irq_state);
280 
281 	/* INTSTS1 */
282 	if (irq_state.intsts1 & ATTCH)
283 		usbhs_mod_call(priv, irq_attch, priv, &irq_state);
284 
285 	if (irq_state.intsts1 & DTCH)
286 		usbhs_mod_call(priv, irq_dtch, priv, &irq_state);
287 
288 	if (irq_state.intsts1 & SIGN)
289 		usbhs_mod_call(priv, irq_sign, priv, &irq_state);
290 
291 	if (irq_state.intsts1 & SACK)
292 		usbhs_mod_call(priv, irq_sack, priv, &irq_state);
293 
294 	return IRQ_HANDLED;
295 }
296 
297 void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod)
298 {
299 	u16 intenb0 = 0;
300 	u16 intenb1 = 0;
301 	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
302 
303 	/*
304 	 * BEMPENB/BRDYENB are picky.
305 	 * below method is required
306 	 *
307 	 *  - clear  INTSTS0
308 	 *  - update BEMPENB/BRDYENB
309 	 *  - update INTSTS0
310 	 */
311 	usbhs_write(priv, INTENB0, 0);
312 	usbhs_write(priv, INTENB1, 0);
313 
314 	usbhs_write(priv, BEMPENB, 0);
315 	usbhs_write(priv, BRDYENB, 0);
316 
317 	/*
318 	 * see also
319 	 *	usbhs_interrupt
320 	 */
321 
322 	/*
323 	 * it don't enable DVSE (intenb0) here
324 	 * but "mod->irq_dev_state" will be called.
325 	 */
326 	if (info->irq_vbus)
327 		intenb0 |= VBSE;
328 
329 	if (mod) {
330 		/*
331 		 * INTSTS0
332 		 */
333 		if (mod->irq_ctrl_stage)
334 			intenb0 |= CTRE;
335 
336 		if (mod->irq_empty && mod->irq_bempsts) {
337 			usbhs_write(priv, BEMPENB, mod->irq_bempsts);
338 			intenb0 |= BEMPE;
339 		}
340 
341 		if (mod->irq_ready && mod->irq_brdysts) {
342 			usbhs_write(priv, BRDYENB, mod->irq_brdysts);
343 			intenb0 |= BRDYE;
344 		}
345 
346 		/*
347 		 * INTSTS1
348 		 */
349 		if (mod->irq_attch)
350 			intenb1 |= ATTCHE;
351 
352 		if (mod->irq_attch)
353 			intenb1 |= DTCHE;
354 
355 		if (mod->irq_sign)
356 			intenb1 |= SIGNE;
357 
358 		if (mod->irq_sack)
359 			intenb1 |= SACKE;
360 	}
361 
362 	if (intenb0)
363 		usbhs_write(priv, INTENB0, intenb0);
364 
365 	if (intenb1)
366 		usbhs_write(priv, INTENB1, intenb1);
367 }
368