aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/renesas_usbhs/mod.c
blob: a577f8f4064ca00a92a5dc43a931e097a496e9dc (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
/*
 * Renesas USB driver
 *
 * Copyright (C) 2011 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */
#include <linux/interrupt.h>

#include "./common.h"
#include "./mod.h"

#define usbhs_priv_to_modinfo(priv) (&priv->mod_info)
#define usbhs_mod_info_call(priv, func, param...)	\
({						\
	struct usbhs_mod_info *info;		\
	info = usbhs_priv_to_modinfo(priv);	\
	!info->func ? 0 :			\
	 info->func(param);			\
})

/*
 *		autonomy
 *
 * these functions are used if platform doesn't have external phy.
 *  -> there is no "notify_hotplug" callback from platform
 *  -> call "notify_hotplug" by itself
 *  -> use own interrupt to connect/disconnect
 *  -> it mean module clock is always ON
 *             ~~~~~~~~~~~~~~~~~~~~~~~~~
 */
static int usbhsm_autonomy_get_vbus(struct platform_device *pdev)
{
	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);

	return  VBSTS & usbhs_read(priv, INTSTS0);
}

static int usbhsm_autonomy_irq_vbus(struct usbhs_priv *priv,
				    struct usbhs_irq_state *irq_state)
{
	struct platform_device *pdev = usbhs_priv_to_pdev(priv);

	return usbhsc_drvcllbck_notify_hotplug(pdev);
}

void usbhs_mod_autonomy_mode(struct usbhs_priv *priv)
{
	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);

	info->irq_vbus		= usbhsm_autonomy_irq_vbus;
	priv->pfunc->get_vbus	= usbhsm_autonomy_get_vbus;

	usbhs_irq_callback_update(priv, NULL);
}

/*
 *		host / gadget functions
 *
 * renesas_usbhs host/gadget can register itself by below functions.
 * these functions are called when probe
 *
 */
void usbhs_mod_register(struct usbhs_priv *priv, struct usbhs_mod *mod, int id)
{
	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);

	info->mod[id]	= mod;
	mod->priv	= priv;
}

struct usbhs_mod *usbhs_mod_get(struct usbhs_priv *priv, int id)
{
	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
	struct usbhs_mod *ret = NULL;

	switch (id) {
	case USBHS_HOST:
	case USBHS_GADGET:
		ret = info->mod[id];
		break;
	}

	return ret;
}

int usbhs_mod_is_host(struct usbhs_priv *priv, struct usbhs_mod *mod)
{
	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);

	if (!mod)
		return -EINVAL;

	return info->mod[USBHS_HOST] == mod;
}

struct usbhs_mod *usbhs_mod_get_current(struct usbhs_priv *priv)
{
	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);

	return info->curt;
}

int usbhs_mod_change(struct usbhs_priv *priv, int id)
{
	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
	struct usbhs_mod *mod = NULL;
	int ret = 0;

	/* id < 0 mean no current */
	switch (id) {
	case USBHS_HOST:
	case USBHS_GADGET:
		mod = info->mod[id];
		break;
	default:
		ret = -EINVAL;
	}
	info->curt = mod;

	return ret;
}

static irqreturn_t usbhs_interrupt(int irq, void *data);
int usbhs_mod_probe(struct usbhs_priv *priv)
{
	struct device *dev = usbhs_priv_to_dev(priv);
	int ret;

	/*
	 * install host/gadget driver
	 */
	ret = usbhs_mod_gadget_probe(priv);
	if (ret < 0)
		return ret;

	/* irq settings */
	ret = request_irq(priv->irq, usbhs_interrupt,
			  IRQF_DISABLED, dev_name(dev), priv);
	if (ret) {
		dev_err(dev, "irq request err\n");
		goto mod_init_gadget_err;
	}

	return ret;

mod_init_gadget_err:
	usbhs_mod_gadget_remove(priv);

	return ret;
}

void usbhs_mod_remove(struct usbhs_priv *priv)
{
	usbhs_mod_gadget_remove(priv);
	free_irq(priv->irq, priv);
}

/*
 *		status functions
 */
int usbhs_status_get_usb_speed(struct usbhs_irq_state *irq_state)
{
	switch (irq_state->dvstctr & RHST) {
	case RHST_LOW_SPEED:
		return USB_SPEED_LOW;
	case RHST_FULL_SPEED:
		return USB_SPEED_FULL;
	case RHST_HIGH_SPEED:
		return USB_SPEED_HIGH;
	}

	return USB_SPEED_UNKNOWN;
}

int usbhs_status_get_device_state(struct usbhs_irq_state *irq_state)
{
	int state = irq_state->intsts0 & DVSQ_MASK;

	switch (state) {
	case POWER_STATE:
	case DEFAULT_STATE:
	case ADDRESS_STATE:
	case CONFIGURATION_STATE:
		return state;
	}

	return -EIO;
}

int usbhs_status_get_ctrl_stage(struct usbhs_irq_state *irq_state)
{
	/*
	 * return value
	 *
	 * IDLE_SETUP_STAGE
	 * READ_DATA_STAGE
	 * READ_STATUS_STAGE
	 * WRITE_DATA_STAGE
	 * WRITE_STATUS_STAGE
	 * NODATA_STATUS_STAGE
	 * SEQUENCE_ERROR
	 */
	return (int)irq_state->intsts0 & CTSQ_MASK;
}

static void usbhs_status_get_each_irq(struct usbhs_priv *priv,
				      struct usbhs_irq_state *state)
{
	struct usbhs_mod *mod = usbhs_mod_get_current(priv);

	state->intsts0 = usbhs_read(priv, INTSTS0);
	state->intsts1 = usbhs_read(priv, INTSTS1);

	state->dvstctr = usbhs_read(priv, DVSTCTR);

	/* mask */
	if (mod) {
		state->brdysts = usbhs_read(priv, BRDYSTS);
		state->nrdysts = usbhs_read(priv, NRDYSTS);
		state->bempsts = usbhs_read(priv, BEMPSTS);

		state->bempsts &= mod->irq_bempsts;
		state->brdysts &= mod->irq_brdysts;
	}
}

/*
 *		interrupt
 */
#define INTSTS0_MAGIC 0xF800 /* acknowledge magical interrupt sources */
#define INTSTS1_MAGIC 0xA870 /* acknowledge magical interrupt sources */
static irqreturn_t usbhs_interrupt(int irq, void *data)
{
	struct usbhs_priv *priv = data;
	struct usbhs_irq_state irq_state;

	usbhs_status_get_each_irq(priv, &irq_state);

	/*
	 * clear interrupt
	 *
	 * The hardware is _very_ picky to clear interrupt bit.
	 * Especially INTSTS0_MAGIC, INTSTS1_MAGIC value.
	 *
	 * see
	 *	"Operation"
	 *	 - "Control Transfer (DCP)"
	 *	   - Function :: VALID bit should 0
	 */
	usbhs_write(priv, INTSTS0, ~irq_state.intsts0 & INTSTS0_MAGIC);
	usbhs_write(priv, INTSTS1, ~irq_state.intsts1 & INTSTS1_MAGIC);

	usbhs_write(priv, BRDYSTS, 0);
	usbhs_write(priv, NRDYSTS, 0);
	usbhs_write(priv, BEMPSTS, 0);

	/*
	 * call irq callback functions
	 * see also
	 *	usbhs_irq_setting_update
	 */
	if (irq_state.intsts0 & VBINT)
		usbhs_mod_info_call(priv, irq_vbus, priv, &irq_state);

	if (irq_state.intsts0 & DVST)
		usbhs_mod_call(priv, irq_dev_state, priv, &irq_state);

	if (irq_state.intsts0 & CTRT)
		usbhs_mod_call(priv, irq_ctrl_stage, priv, &irq_state);

	if (irq_state.intsts0 & BEMP)
		usbhs_mod_call(priv, irq_empty, priv, &irq_state);

	if (irq_state.intsts0 & BRDY)
		usbhs_mod_call(priv, irq_ready, priv, &irq_state);

	return IRQ_HANDLED;
}

void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod)
{
	u16 intenb0 = 0;
	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);

	usbhs_write(priv, INTENB0, 0);

	usbhs_write(priv, BEMPENB, 0);
	usbhs_write(priv, BRDYENB, 0);

	/*
	 * see also
	 *	usbhs_interrupt
	 */

	/*
	 * it don't enable DVSE (intenb0) here
	 * but "mod->irq_dev_state" will be called.
	 */
	if (info->irq_vbus)
		intenb0 |= VBSE;

	if (mod) {
		if (mod->irq_ctrl_stage)
			intenb0 |= CTRE;

		if (mod->irq_empty && mod->irq_bempsts) {
			usbhs_write(priv, BEMPENB, mod->irq_bempsts);
			intenb0 |= BEMPE;
		}

		if (mod->irq_ready && mod->irq_brdysts) {
			usbhs_write(priv, BRDYENB, mod->irq_brdysts);
			intenb0 |= BRDYE;
		}
	}

	usbhs_write(priv, INTENB0, intenb0);
}