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
 217         state->intsts0 = usbhs_read(priv, INTSTS0);
 218         state->intsts1 = usbhs_read(priv, INTSTS1);
 219
 220         intenb0 = usbhs_read(priv, INTENB0);
 221         intenb1 = usbhs_read(priv, INTENB1);
 222
 223         /* mask */
 224         if (mod) {
 225                 state->brdysts = usbhs_read(priv, BRDYSTS);
 226                 state->nrdysts = usbhs_read(priv, NRDYSTS);
 227                 state->bempsts = usbhs_read(priv, BEMPSTS);
 228
 229                 state->bempsts &= mod->irq_bempsts;
 230                 state->brdysts &= mod->irq_brdysts;
 231         }
 232
 233         /*
 234          * Check whether the irq enable registers and the irq status are set
 235          * when IRQF_SHARED is set.
 236          */
 237         if (priv->irqflags & IRQF_SHARED) {
 238                 if (!(intenb0 & state->intsts0) &&
 239                     !(intenb1 & state->intsts1) &&
 240                     !(state->bempsts) &&
 241                     !(state->brdysts))
 242                         return -EIO;
 243         }
 244
 245         return 0;
 246 }
 247
 248 /*
 249  *              interrupt
 250  */
 251 #define INTSTS0_MAGIC 0xF800 /* acknowledge magical interrupt sources */
 252 #define INTSTS1_MAGIC 0xA870 /* acknowledge magical interrupt sources */
 253 static irqreturn_t usbhs_interrupt(int irq, void *data)
 254 {
 255         struct usbhs_priv *priv = data;
 256         struct usbhs_irq_state irq_state;
 257
 258         if (usbhs_status_get_each_irq(priv, &irq_state) < 0)
 259                 return IRQ_NONE;
 260
 261         /*
 262          * clear interrupt
 263          *
 264          * The hardware is _very_ picky to clear interrupt bit.
 265          * Especially INTSTS0_MAGIC, INTSTS1_MAGIC value.
 266          *
 267          * see
 268          *      "Operation"
 269          *       - "Control Transfer (DCP)"
 270          *         - Function :: VALID bit should 0
 271          */
 272         usbhs_write(priv, INTSTS0, ~irq_state.intsts0 & INTSTS0_MAGIC);
 273         usbhs_write(priv, INTSTS1, ~irq_state.intsts1 & INTSTS1_MAGIC);
 274
 275         /*
 276          * The driver should not clear the xxxSTS after the line of
 277          * "call irq callback functions" because each "if" statement is
 278          * possible to call the callback function for avoiding any side effects.
 279          */
 280         if (irq_state.intsts0 & BRDY)
 281                 usbhs_write(priv, BRDYSTS, ~irq_state.brdysts);
 282         usbhs_write(priv, NRDYSTS, ~irq_state.nrdysts);
 283         if (irq_state.intsts0 & BEMP)
 284                 usbhs_write(priv, BEMPSTS, ~irq_state.bempsts);
 285
 286         /*
 287          * call irq callback functions
 288          * see also
 289          *      usbhs_irq_setting_update
 290          */
 291
 292         /* INTSTS0 */
 293         if (irq_state.intsts0 & VBINT)
 294                 usbhs_mod_info_call(priv, irq_vbus, priv, &irq_state);
 295
 296         if (irq_state.intsts0 & DVST)
 297                 usbhs_mod_call(priv, irq_dev_state, priv, &irq_state);
 298
 299         if (irq_state.intsts0 & CTRT)
 300                 usbhs_mod_call(priv, irq_ctrl_stage, priv, &irq_state);
 301
 302         if (irq_state.intsts0 & BEMP)
 303                 usbhs_mod_call(priv, irq_empty, priv, &irq_state);
 304
 305         if (irq_state.intsts0 & BRDY)
 306                 usbhs_mod_call(priv, irq_ready, priv, &irq_state);
 307
 308         /* INTSTS1 */
 309         if (irq_state.intsts1 & ATTCH)
 310                 usbhs_mod_call(priv, irq_attch, priv, &irq_state);
 311
 312         if (irq_state.intsts1 & DTCH)
 313                 usbhs_mod_call(priv, irq_dtch, priv, &irq_state);
 314
 315         if (irq_state.intsts1 & SIGN)
 316                 usbhs_mod_call(priv, irq_sign, priv, &irq_state);
 317
 318         if (irq_state.intsts1 & SACK)
 319                 usbhs_mod_call(priv, irq_sack, priv, &irq_state);
 320
 321         return IRQ_HANDLED;
 322 }
 323
 324 void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod)
 325 {
 326         u16 intenb0 = 0;
 327         u16 intenb1 = 0;
 328         struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
 329
 330         /*
 331          * BEMPENB/BRDYENB are picky.
 332          * below method is required
 333          *
 334          *  - clear  INTSTS0
 335          *  - update BEMPENB/BRDYENB
 336          *  - update INTSTS0
 337          */
 338         usbhs_write(priv, INTENB0, 0);
 339         usbhs_write(priv, INTENB1, 0);
 340
 341         usbhs_write(priv, BEMPENB, 0);
 342         usbhs_write(priv, BRDYENB, 0);
 343
 344         /*
 345          * see also
 346          *      usbhs_interrupt
 347          */
 348
 349         /*
 350          * it don't enable DVSE (intenb0) here
 351          * but "mod->irq_dev_state" will be called.
 352          */
 353         if (info->irq_vbus)
 354                 intenb0 |= VBSE;
 355
 356         if (mod) {
 357                 /*
 358                  * INTSTS0
 359                  */
 360                 if (mod->irq_ctrl_stage)
 361                         intenb0 |= CTRE;
 362
 363                 if (mod->irq_empty && mod->irq_bempsts) {
 364                         usbhs_write(priv, BEMPENB, mod->irq_bempsts);
 365                         intenb0 |= BEMPE;
 366                 }
 367
 368                 if (mod->irq_ready && mod->irq_brdysts) {
 369                         usbhs_write(priv, BRDYENB, mod->irq_brdysts);
 370                         intenb0 |= BRDYE;
 371                 }
 372
 373                 /*
 374                  * INTSTS1
 375                  */
 376                 if (mod->irq_attch)
 377                         intenb1 |= ATTCHE;
 378
 379                 if (mod->irq_dtch)
 380                         intenb1 |= DTCHE;
 381
 382                 if (mod->irq_sign)
 383                         intenb1 |= SIGNE;
 384
 385                 if (mod->irq_sack)
 386                         intenb1 |= SACKE;
 387         }
 388
 389         if (intenb0)
 390                 usbhs_write(priv, INTENB0, intenb0);
 391
 392         if (intenb1)
 393                 usbhs_write(priv, INTENB1, intenb1);
 394 }