kernel/drivers/usb/renesas_usbhs/mod.c

   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 }