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f1407d5c KM |
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) | |
b002ff6e KM |
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 | } | |
f1407d5c KM |
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, struct usbhs_mod *mod) | |
97 | { | |
98 | struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); | |
99 | ||
100 | if (!mod) | |
101 | return -EINVAL; | |
102 | ||
103 | return info->mod[USBHS_HOST] == mod; | |
104 | } | |
105 | ||
106 | struct usbhs_mod *usbhs_mod_get_current(struct usbhs_priv *priv) | |
107 | { | |
108 | struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); | |
109 | ||
110 | return info->curt; | |
111 | } | |
112 | ||
113 | int usbhs_mod_change(struct usbhs_priv *priv, int id) | |
114 | { | |
115 | struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); | |
116 | struct usbhs_mod *mod = NULL; | |
117 | int ret = 0; | |
118 | ||
119 | /* id < 0 mean no current */ | |
120 | switch (id) { | |
121 | case USBHS_HOST: | |
122 | case USBHS_GADGET: | |
123 | mod = info->mod[id]; | |
124 | break; | |
125 | default: | |
126 | ret = -EINVAL; | |
127 | } | |
128 | info->curt = mod; | |
129 | ||
130 | return ret; | |
131 | } | |
132 | ||
133 | static irqreturn_t usbhs_interrupt(int irq, void *data); | |
134 | int usbhs_mod_probe(struct usbhs_priv *priv) | |
135 | { | |
136 | struct device *dev = usbhs_priv_to_dev(priv); | |
137 | int ret; | |
138 | ||
2f98382d KM |
139 | /* |
140 | * install host/gadget driver | |
141 | */ | |
142 | ret = usbhs_mod_gadget_probe(priv); | |
143 | if (ret < 0) | |
144 | return ret; | |
145 | ||
f1407d5c KM |
146 | /* irq settings */ |
147 | ret = request_irq(priv->irq, usbhs_interrupt, | |
b5dd18d8 | 148 | 0, dev_name(dev), priv); |
2f98382d | 149 | if (ret) { |
f1407d5c | 150 | dev_err(dev, "irq request err\n"); |
2f98382d KM |
151 | goto mod_init_gadget_err; |
152 | } | |
153 | ||
154 | return ret; | |
155 | ||
156 | mod_init_gadget_err: | |
157 | usbhs_mod_gadget_remove(priv); | |
f1407d5c KM |
158 | |
159 | return ret; | |
160 | } | |
161 | ||
162 | void usbhs_mod_remove(struct usbhs_priv *priv) | |
163 | { | |
2f98382d | 164 | usbhs_mod_gadget_remove(priv); |
f1407d5c KM |
165 | free_irq(priv->irq, priv); |
166 | } | |
167 | ||
168 | /* | |
169 | * status functions | |
170 | */ | |
171 | int usbhs_status_get_usb_speed(struct usbhs_irq_state *irq_state) | |
172 | { | |
173 | switch (irq_state->dvstctr & RHST) { | |
174 | case RHST_LOW_SPEED: | |
175 | return USB_SPEED_LOW; | |
176 | case RHST_FULL_SPEED: | |
177 | return USB_SPEED_FULL; | |
178 | case RHST_HIGH_SPEED: | |
179 | return USB_SPEED_HIGH; | |
180 | } | |
181 | ||
182 | return USB_SPEED_UNKNOWN; | |
183 | } | |
184 | ||
185 | int usbhs_status_get_device_state(struct usbhs_irq_state *irq_state) | |
186 | { | |
187 | int state = irq_state->intsts0 & DVSQ_MASK; | |
188 | ||
189 | switch (state) { | |
190 | case POWER_STATE: | |
191 | case DEFAULT_STATE: | |
192 | case ADDRESS_STATE: | |
193 | case CONFIGURATION_STATE: | |
194 | return state; | |
195 | } | |
196 | ||
197 | return -EIO; | |
198 | } | |
199 | ||
200 | int usbhs_status_get_ctrl_stage(struct usbhs_irq_state *irq_state) | |
201 | { | |
202 | /* | |
203 | * return value | |
204 | * | |
205 | * IDLE_SETUP_STAGE | |
206 | * READ_DATA_STAGE | |
207 | * READ_STATUS_STAGE | |
208 | * WRITE_DATA_STAGE | |
209 | * WRITE_STATUS_STAGE | |
210 | * NODATA_STATUS_STAGE | |
211 | * SEQUENCE_ERROR | |
212 | */ | |
213 | return (int)irq_state->intsts0 & CTSQ_MASK; | |
214 | } | |
215 | ||
216 | static void usbhs_status_get_each_irq(struct usbhs_priv *priv, | |
217 | struct usbhs_irq_state *state) | |
218 | { | |
219 | struct usbhs_mod *mod = usbhs_mod_get_current(priv); | |
220 | ||
221 | state->intsts0 = usbhs_read(priv, INTSTS0); | |
222 | state->intsts1 = usbhs_read(priv, INTSTS1); | |
223 | ||
f1407d5c KM |
224 | state->dvstctr = usbhs_read(priv, DVSTCTR); |
225 | ||
226 | /* mask */ | |
5ea68d54 KM |
227 | if (mod) { |
228 | state->brdysts = usbhs_read(priv, BRDYSTS); | |
229 | state->nrdysts = usbhs_read(priv, NRDYSTS); | |
230 | state->bempsts = usbhs_read(priv, BEMPSTS); | |
231 | ||
232 | state->bempsts &= mod->irq_bempsts; | |
233 | state->brdysts &= mod->irq_brdysts; | |
234 | } | |
f1407d5c KM |
235 | } |
236 | ||
237 | /* | |
238 | * interrupt | |
239 | */ | |
240 | #define INTSTS0_MAGIC 0xF800 /* acknowledge magical interrupt sources */ | |
241 | #define INTSTS1_MAGIC 0xA870 /* acknowledge magical interrupt sources */ | |
242 | static irqreturn_t usbhs_interrupt(int irq, void *data) | |
243 | { | |
244 | struct usbhs_priv *priv = data; | |
245 | struct usbhs_irq_state irq_state; | |
246 | ||
247 | usbhs_status_get_each_irq(priv, &irq_state); | |
248 | ||
249 | /* | |
250 | * clear interrupt | |
251 | * | |
252 | * The hardware is _very_ picky to clear interrupt bit. | |
253 | * Especially INTSTS0_MAGIC, INTSTS1_MAGIC value. | |
254 | * | |
255 | * see | |
256 | * "Operation" | |
257 | * - "Control Transfer (DCP)" | |
258 | * - Function :: VALID bit should 0 | |
259 | */ | |
260 | usbhs_write(priv, INTSTS0, ~irq_state.intsts0 & INTSTS0_MAGIC); | |
261 | usbhs_write(priv, INTSTS1, ~irq_state.intsts1 & INTSTS1_MAGIC); | |
262 | ||
263 | usbhs_write(priv, BRDYSTS, 0); | |
264 | usbhs_write(priv, NRDYSTS, 0); | |
265 | usbhs_write(priv, BEMPSTS, 0); | |
266 | ||
267 | /* | |
268 | * call irq callback functions | |
269 | * see also | |
270 | * usbhs_irq_setting_update | |
271 | */ | |
b002ff6e KM |
272 | if (irq_state.intsts0 & VBINT) |
273 | usbhs_mod_info_call(priv, irq_vbus, priv, &irq_state); | |
274 | ||
f1407d5c KM |
275 | if (irq_state.intsts0 & DVST) |
276 | usbhs_mod_call(priv, irq_dev_state, priv, &irq_state); | |
277 | ||
278 | if (irq_state.intsts0 & CTRT) | |
279 | usbhs_mod_call(priv, irq_ctrl_stage, priv, &irq_state); | |
280 | ||
281 | if (irq_state.intsts0 & BEMP) | |
282 | usbhs_mod_call(priv, irq_empty, priv, &irq_state); | |
283 | ||
284 | if (irq_state.intsts0 & BRDY) | |
285 | usbhs_mod_call(priv, irq_ready, priv, &irq_state); | |
286 | ||
287 | return IRQ_HANDLED; | |
288 | } | |
289 | ||
290 | void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod) | |
291 | { | |
292 | u16 intenb0 = 0; | |
b002ff6e | 293 | struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); |
f1407d5c KM |
294 | |
295 | usbhs_write(priv, INTENB0, 0); | |
296 | ||
297 | usbhs_write(priv, BEMPENB, 0); | |
298 | usbhs_write(priv, BRDYENB, 0); | |
299 | ||
300 | /* | |
301 | * see also | |
302 | * usbhs_interrupt | |
303 | */ | |
304 | ||
305 | /* | |
306 | * it don't enable DVSE (intenb0) here | |
307 | * but "mod->irq_dev_state" will be called. | |
308 | */ | |
b002ff6e KM |
309 | if (info->irq_vbus) |
310 | intenb0 |= VBSE; | |
f1407d5c | 311 | |
5ea68d54 KM |
312 | if (mod) { |
313 | if (mod->irq_ctrl_stage) | |
314 | intenb0 |= CTRE; | |
f1407d5c | 315 | |
5ea68d54 KM |
316 | if (mod->irq_empty && mod->irq_bempsts) { |
317 | usbhs_write(priv, BEMPENB, mod->irq_bempsts); | |
318 | intenb0 |= BEMPE; | |
319 | } | |
f1407d5c | 320 | |
5ea68d54 KM |
321 | if (mod->irq_ready && mod->irq_brdysts) { |
322 | usbhs_write(priv, BRDYENB, mod->irq_brdysts); | |
323 | intenb0 |= BRDYE; | |
324 | } | |
f1407d5c KM |
325 | } |
326 | ||
327 | usbhs_write(priv, INTENB0, intenb0); | |
328 | } |