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 renesas_usbhs_call_notify_hotplug(pdev); 54 55 return 0; 56 } 57 58 void usbhs_mod_autonomy_mode(struct usbhs_priv *priv) 59 { 60 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 61 62 info->irq_vbus = usbhsm_autonomy_irq_vbus; 63 priv->pfunc.get_vbus = usbhsm_autonomy_get_vbus; 64 65 usbhs_irq_callback_update(priv, NULL); 66 } 67 68 /* 69 * host / gadget functions 70 * 71 * renesas_usbhs host/gadget can register itself by below functions. 72 * these functions are called when probe 73 * 74 */ 75 void usbhs_mod_register(struct usbhs_priv *priv, struct usbhs_mod *mod, int id) 76 { 77 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 78 79 info->mod[id] = mod; 80 mod->priv = priv; 81 } 82 83 struct usbhs_mod *usbhs_mod_get(struct usbhs_priv *priv, int id) 84 { 85 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 86 struct usbhs_mod *ret = NULL; 87 88 switch (id) { 89 case USBHS_HOST: 90 case USBHS_GADGET: 91 ret = info->mod[id]; 92 break; 93 } 94 95 return ret; 96 } 97 98 int usbhs_mod_is_host(struct usbhs_priv *priv) 99 { 100 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 101 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 102 103 if (!mod) 104 return -EINVAL; 105 106 return info->mod[USBHS_HOST] == mod; 107 } 108 109 struct usbhs_mod *usbhs_mod_get_current(struct usbhs_priv *priv) 110 { 111 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 112 113 return info->curt; 114 } 115 116 int usbhs_mod_change(struct usbhs_priv *priv, int id) 117 { 118 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 119 struct usbhs_mod *mod = NULL; 120 int ret = 0; 121 122 /* id < 0 mean no current */ 123 switch (id) { 124 case USBHS_HOST: 125 case USBHS_GADGET: 126 mod = info->mod[id]; 127 break; 128 default: 129 ret = -EINVAL; 130 } 131 info->curt = mod; 132 133 return ret; 134 } 135 136 static irqreturn_t usbhs_interrupt(int irq, void *data); 137 int usbhs_mod_probe(struct usbhs_priv *priv) 138 { 139 struct device *dev = usbhs_priv_to_dev(priv); 140 int ret; 141 142 /* 143 * install host/gadget driver 144 */ 145 ret = usbhs_mod_host_probe(priv); 146 if (ret < 0) 147 return ret; 148 149 ret = usbhs_mod_gadget_probe(priv); 150 if (ret < 0) 151 goto mod_init_host_err; 152 153 /* irq settings */ 154 ret = devm_request_irq(dev, priv->irq, usbhs_interrupt, 155 priv->irqflags, dev_name(dev), priv); 156 if (ret) { 157 dev_err(dev, "irq request err\n"); 158 goto mod_init_gadget_err; 159 } 160 161 return ret; 162 163 mod_init_gadget_err: 164 usbhs_mod_gadget_remove(priv); 165 mod_init_host_err: 166 usbhs_mod_host_remove(priv); 167 168 return ret; 169 } 170 171 void usbhs_mod_remove(struct usbhs_priv *priv) 172 { 173 usbhs_mod_host_remove(priv); 174 usbhs_mod_gadget_remove(priv); 175 } 176 177 /* 178 * status functions 179 */ 180 int usbhs_status_get_device_state(struct usbhs_irq_state *irq_state) 181 { 182 int state = irq_state->intsts0 & DVSQ_MASK; 183 184 switch (state) { 185 case POWER_STATE: 186 case DEFAULT_STATE: 187 case ADDRESS_STATE: 188 case CONFIGURATION_STATE: 189 return state; 190 } 191 192 return -EIO; 193 } 194 195 int usbhs_status_get_ctrl_stage(struct usbhs_irq_state *irq_state) 196 { 197 /* 198 * return value 199 * 200 * IDLE_SETUP_STAGE 201 * READ_DATA_STAGE 202 * READ_STATUS_STAGE 203 * WRITE_DATA_STAGE 204 * WRITE_STATUS_STAGE 205 * NODATA_STATUS_STAGE 206 * SEQUENCE_ERROR 207 */ 208 return (int)irq_state->intsts0 & CTSQ_MASK; 209 } 210 211 static int usbhs_status_get_each_irq(struct usbhs_priv *priv, 212 struct usbhs_irq_state *state) 213 { 214 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 215 u16 intenb0, intenb1; 216 unsigned long flags; 217 218 /******************** spin lock ********************/ 219 usbhs_lock(priv, flags); 220 state->intsts0 = usbhs_read(priv, INTSTS0); 221 state->intsts1 = usbhs_read(priv, INTSTS1); 222 223 intenb0 = usbhs_read(priv, INTENB0); 224 intenb1 = usbhs_read(priv, INTENB1); 225 226 /* mask */ 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 } 235 usbhs_unlock(priv, flags); 236 /******************** spin unlock ******************/ 237 238 /* 239 * Check whether the irq enable registers and the irq status are set 240 * when IRQF_SHARED is set. 241 */ 242 if (priv->irqflags & IRQF_SHARED) { 243 if (!(intenb0 & state->intsts0) && 244 !(intenb1 & state->intsts1) && 245 !(state->bempsts) && 246 !(state->brdysts)) 247 return -EIO; 248 } 249 250 return 0; 251 } 252 253 /* 254 * interrupt 255 */ 256 #define INTSTS0_MAGIC 0xF800 /* acknowledge magical interrupt sources */ 257 #define INTSTS1_MAGIC 0xA870 /* acknowledge magical interrupt sources */ 258 static irqreturn_t usbhs_interrupt(int irq, void *data) 259 { 260 struct usbhs_priv *priv = data; 261 struct usbhs_irq_state irq_state; 262 263 if (usbhs_status_get_each_irq(priv, &irq_state) < 0) 264 return IRQ_NONE; 265 266 /* 267 * clear interrupt 268 * 269 * The hardware is _very_ picky to clear interrupt bit. 270 * Especially INTSTS0_MAGIC, INTSTS1_MAGIC value. 271 * 272 * see 273 * "Operation" 274 * - "Control Transfer (DCP)" 275 * - Function :: VALID bit should 0 276 */ 277 usbhs_write(priv, INTSTS0, ~irq_state.intsts0 & INTSTS0_MAGIC); 278 usbhs_write(priv, INTSTS1, ~irq_state.intsts1 & INTSTS1_MAGIC); 279 280 usbhs_write(priv, BRDYSTS, ~irq_state.brdysts); 281 usbhs_write(priv, NRDYSTS, ~irq_state.nrdysts); 282 usbhs_write(priv, BEMPSTS, ~irq_state.bempsts); 283 284 /* 285 * call irq callback functions 286 * see also 287 * usbhs_irq_setting_update 288 */ 289 290 /* INTSTS0 */ 291 if (irq_state.intsts0 & VBINT) 292 usbhs_mod_info_call(priv, irq_vbus, priv, &irq_state); 293 294 if (irq_state.intsts0 & DVST) 295 usbhs_mod_call(priv, irq_dev_state, priv, &irq_state); 296 297 if (irq_state.intsts0 & CTRT) 298 usbhs_mod_call(priv, irq_ctrl_stage, priv, &irq_state); 299 300 if (irq_state.intsts0 & BEMP) 301 usbhs_mod_call(priv, irq_empty, priv, &irq_state); 302 303 if (irq_state.intsts0 & BRDY) 304 usbhs_mod_call(priv, irq_ready, priv, &irq_state); 305 306 /* INTSTS1 */ 307 if (irq_state.intsts1 & ATTCH) 308 usbhs_mod_call(priv, irq_attch, priv, &irq_state); 309 310 if (irq_state.intsts1 & DTCH) 311 usbhs_mod_call(priv, irq_dtch, priv, &irq_state); 312 313 if (irq_state.intsts1 & SIGN) 314 usbhs_mod_call(priv, irq_sign, priv, &irq_state); 315 316 if (irq_state.intsts1 & SACK) 317 usbhs_mod_call(priv, irq_sack, priv, &irq_state); 318 319 return IRQ_HANDLED; 320 } 321 322 void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod) 323 { 324 u16 intenb0 = 0; 325 u16 intenb1 = 0; 326 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 327 328 /* 329 * BEMPENB/BRDYENB are picky. 330 * below method is required 331 * 332 * - clear INTSTS0 333 * - update BEMPENB/BRDYENB 334 * - update INTSTS0 335 */ 336 usbhs_write(priv, INTENB0, 0); 337 usbhs_write(priv, INTENB1, 0); 338 339 usbhs_write(priv, BEMPENB, 0); 340 usbhs_write(priv, BRDYENB, 0); 341 342 /* 343 * see also 344 * usbhs_interrupt 345 */ 346 347 /* 348 * it don't enable DVSE (intenb0) here 349 * but "mod->irq_dev_state" will be called. 350 */ 351 if (info->irq_vbus) 352 intenb0 |= VBSE; 353 354 if (mod) { 355 /* 356 * INTSTS0 357 */ 358 if (mod->irq_ctrl_stage) 359 intenb0 |= CTRE; 360 361 if (mod->irq_empty && mod->irq_bempsts) { 362 usbhs_write(priv, BEMPENB, mod->irq_bempsts); 363 intenb0 |= BEMPE; 364 } 365 366 if (mod->irq_ready && mod->irq_brdysts) { 367 usbhs_write(priv, BRDYENB, mod->irq_brdysts); 368 intenb0 |= BRDYE; 369 } 370 371 /* 372 * INTSTS1 373 */ 374 if (mod->irq_attch) 375 intenb1 |= ATTCHE; 376 377 if (mod->irq_dtch) 378 intenb1 |= DTCHE; 379 380 if (mod->irq_sign) 381 intenb1 |= SIGNE; 382 383 if (mod->irq_sack) 384 intenb1 |= SACKE; 385 } 386 387 if (intenb0) 388 usbhs_write(priv, INTENB0, intenb0); 389 390 if (intenb1) 391 usbhs_write(priv, INTENB1, intenb1); 392 } 393