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         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 }
  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
 139         /*
 140          * install host/gadget driver
 141          */
 142         ret = usbhs_mod_gadget_probe(priv);
 143         if (ret < 0)
 144                 return ret;
 145
 146         /* irq settings */
 147         ret = request_irq(priv->irq, usbhs_interrupt,
 148                           IRQF_DISABLED, dev_name(dev), priv);
 149         if (ret) {
 150                 dev_err(dev, "irq request err\n");
 151                 goto mod_init_gadget_err;
 152         }
 153
 154         return ret;
 155
 156 mod_init_gadget_err:
 157         usbhs_mod_gadget_remove(priv);
 158
 159         return ret;
 160 }
 161
 162 void usbhs_mod_remove(struct usbhs_priv *priv)
 163 {
 164         usbhs_mod_gadget_remove(priv);
 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
 224         state->dvstctr = usbhs_read(priv, DVSTCTR);
 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 }
 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          */
 272         if (irq_state.intsts0 & VBINT)
 273                 usbhs_mod_info_call(priv, irq_vbus, priv, &irq_state);
 274
 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;
 293         struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
 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          */
 309         if (info->irq_vbus)
 310                 intenb0 |= VBSE;
 311
 312         if (mod) {
 313                 if (mod->irq_ctrl_stage)
 314                         intenb0 |= CTRE;
 315
 316                 if (mod->irq_empty && mod->irq_bempsts) {
 317                         usbhs_write(priv, BEMPENB, mod->irq_bempsts);
 318                         intenb0 |= BEMPE;
 319                 }
 320
 321                 if (mod->irq_ready && mod->irq_brdysts) {
 322                         usbhs_write(priv, BRDYENB, mod->irq_brdysts);
 323                         intenb0 |= BRDYE;
 324                 }
 325         }
 326
 327         usbhs_write(priv, INTENB0, intenb0);
 328 }