drivers/usb/otg/ulpi.c

   1 /*
   2  * Generic ULPI USB transceiver support
   3  *
   4  * Copyright (C) 2009 Daniel Mack <daniel@caiaq.de>
   5  *
   6  * Based on sources from
   7  *
   8  *   Sascha Hauer <s.hauer@pengutronix.de>
   9  *   Freescale Semiconductors
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/slab.h>
  28 #include <linux/export.h>
  29 #include <linux/usb.h>
  30 #include <linux/usb/otg.h>
  31 #include <linux/usb/ulpi.h>
  32
  33
  34 struct ulpi_info {
  35         unsigned int    id;
  36         char            *name;
  37 };
  38
  39 #define ULPI_ID(vendor, product) (((vendor) << 16) | (product))
  40 #define ULPI_INFO(_id, _name)           \
  41         {                               \
  42                 .id     = (_id),        \
  43                 .name   = (_name),      \
  44         }
  45
  46 /* ULPI hardcoded IDs, used for probing */
  47 static struct ulpi_info ulpi_ids[] = {
  48         ULPI_INFO(ULPI_ID(0x04cc, 0x1504), "NXP ISP1504"),
  49         ULPI_INFO(ULPI_ID(0x0424, 0x0006), "SMSC USB331x"),
  50 };
  51
  52 static int ulpi_set_otg_flags(struct otg_transceiver *otg)
  53 {
  54         unsigned int flags = ULPI_OTG_CTRL_DP_PULLDOWN |
  55                              ULPI_OTG_CTRL_DM_PULLDOWN;
  56
  57         if (otg->flags & ULPI_OTG_ID_PULLUP)
  58                 flags |= ULPI_OTG_CTRL_ID_PULLUP;
  59
  60         /*
  61          * ULPI Specification rev.1.1 default
  62          * for Dp/DmPulldown is enabled.
  63          */
  64         if (otg->flags & ULPI_OTG_DP_PULLDOWN_DIS)
  65                 flags &= ~ULPI_OTG_CTRL_DP_PULLDOWN;
  66
  67         if (otg->flags & ULPI_OTG_DM_PULLDOWN_DIS)
  68                 flags &= ~ULPI_OTG_CTRL_DM_PULLDOWN;
  69
  70         if (otg->flags & ULPI_OTG_EXTVBUSIND)
  71                 flags |= ULPI_OTG_CTRL_EXTVBUSIND;
  72
  73         return otg_io_write(otg, flags, ULPI_OTG_CTRL);
  74 }
  75
  76 static int ulpi_set_fc_flags(struct otg_transceiver *otg)
  77 {
  78         unsigned int flags = 0;
  79
  80         /*
  81          * ULPI Specification rev.1.1 default
  82          * for XcvrSelect is Full Speed.
  83          */
  84         if (otg->flags & ULPI_FC_HS)
  85                 flags |= ULPI_FUNC_CTRL_HIGH_SPEED;
  86         else if (otg->flags & ULPI_FC_LS)
  87                 flags |= ULPI_FUNC_CTRL_LOW_SPEED;
  88         else if (otg->flags & ULPI_FC_FS4LS)
  89                 flags |= ULPI_FUNC_CTRL_FS4LS;
  90         else
  91                 flags |= ULPI_FUNC_CTRL_FULL_SPEED;
  92
  93         if (otg->flags & ULPI_FC_TERMSEL)
  94                 flags |= ULPI_FUNC_CTRL_TERMSELECT;
  95
  96         /*
  97          * ULPI Specification rev.1.1 default
  98          * for OpMode is Normal Operation.
  99          */
 100         if (otg->flags & ULPI_FC_OP_NODRV)
 101                 flags |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
 102         else if (otg->flags & ULPI_FC_OP_DIS_NRZI)
 103                 flags |= ULPI_FUNC_CTRL_OPMODE_DISABLE_NRZI;
 104         else if (otg->flags & ULPI_FC_OP_NSYNC_NEOP)
 105                 flags |= ULPI_FUNC_CTRL_OPMODE_NOSYNC_NOEOP;
 106         else
 107                 flags |= ULPI_FUNC_CTRL_OPMODE_NORMAL;
 108
 109         /*
 110          * ULPI Specification rev.1.1 default
 111          * for SuspendM is Powered.
 112          */
 113         flags |= ULPI_FUNC_CTRL_SUSPENDM;
 114
 115         return otg_io_write(otg, flags, ULPI_FUNC_CTRL);
 116 }
 117
 118 static int ulpi_set_ic_flags(struct otg_transceiver *otg)
 119 {
 120         unsigned int flags = 0;
 121
 122         if (otg->flags & ULPI_IC_AUTORESUME)
 123                 flags |= ULPI_IFC_CTRL_AUTORESUME;
 124
 125         if (otg->flags & ULPI_IC_EXTVBUS_INDINV)
 126                 flags |= ULPI_IFC_CTRL_EXTERNAL_VBUS;
 127
 128         if (otg->flags & ULPI_IC_IND_PASSTHRU)
 129                 flags |= ULPI_IFC_CTRL_PASSTHRU;
 130
 131         if (otg->flags & ULPI_IC_PROTECT_DIS)
 132                 flags |= ULPI_IFC_CTRL_PROTECT_IFC_DISABLE;
 133
 134         return otg_io_write(otg, flags, ULPI_IFC_CTRL);
 135 }
 136
 137 static int ulpi_set_flags(struct otg_transceiver *otg)
 138 {
 139         int ret;
 140
 141         ret = ulpi_set_otg_flags(otg);
 142         if (ret)
 143                 return ret;
 144
 145         ret = ulpi_set_ic_flags(otg);
 146         if (ret)
 147                 return ret;
 148
 149         return ulpi_set_fc_flags(otg);
 150 }
 151
 152 static int ulpi_check_integrity(struct otg_transceiver *otg)
 153 {
 154         int ret, i;
 155         unsigned int val = 0x55;
 156
 157         for (i = 0; i < 2; i++) {
 158                 ret = otg_io_write(otg, val, ULPI_SCRATCH);
 159                 if (ret < 0)
 160                         return ret;
 161
 162                 ret = otg_io_read(otg, ULPI_SCRATCH);
 163                 if (ret < 0)
 164                         return ret;
 165
 166                 if (ret != val) {
 167                         pr_err("ULPI integrity check: failed!");
 168                         return -ENODEV;
 169                 }
 170                 val = val << 1;
 171         }
 172
 173         pr_info("ULPI integrity check: passed.\n");
 174
 175         return 0;
 176 }
 177
 178 static int ulpi_init(struct otg_transceiver *otg)
 179 {
 180         int i, vid, pid, ret;
 181         u32 ulpi_id = 0;
 182
 183         for (i = 0; i < 4; i++) {
 184                 ret = otg_io_read(otg, ULPI_PRODUCT_ID_HIGH - i);
 185                 if (ret < 0)
 186                         return ret;
 187                 ulpi_id = (ulpi_id << 8) | ret;
 188         }
 189         vid = ulpi_id & 0xffff;
 190         pid = ulpi_id >> 16;
 191
 192         pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid);
 193
 194         for (i = 0; i < ARRAY_SIZE(ulpi_ids); i++) {
 195                 if (ulpi_ids[i].id == ULPI_ID(vid, pid)) {
 196                         pr_info("Found %s ULPI transceiver.\n",
 197                                 ulpi_ids[i].name);
 198                         break;
 199                 }
 200         }
 201
 202         ret = ulpi_check_integrity(otg);
 203         if (ret)
 204                 return ret;
 205
 206         return ulpi_set_flags(otg);
 207 }
 208
 209 static int ulpi_set_host(struct otg_transceiver *otg, struct usb_bus *host)
 210 {
 211         unsigned int flags = otg_io_read(otg, ULPI_IFC_CTRL);
 212
 213         if (!host) {
 214                 otg->host = NULL;
 215                 return 0;
 216         }
 217
 218         otg->host = host;
 219
 220         flags &= ~(ULPI_IFC_CTRL_6_PIN_SERIAL_MODE |
 221                    ULPI_IFC_CTRL_3_PIN_SERIAL_MODE |
 222                    ULPI_IFC_CTRL_CARKITMODE);
 223
 224         if (otg->flags & ULPI_IC_6PIN_SERIAL)
 225                 flags |= ULPI_IFC_CTRL_6_PIN_SERIAL_MODE;
 226         else if (otg->flags & ULPI_IC_3PIN_SERIAL)
 227                 flags |= ULPI_IFC_CTRL_3_PIN_SERIAL_MODE;
 228         else if (otg->flags & ULPI_IC_CARKIT)
 229                 flags |= ULPI_IFC_CTRL_CARKITMODE;
 230
 231         return otg_io_write(otg, flags, ULPI_IFC_CTRL);
 232 }
 233
 234 static int ulpi_set_vbus(struct otg_transceiver *otg, bool on)
 235 {
 236         unsigned int flags = otg_io_read(otg, ULPI_OTG_CTRL);
 237
 238         flags &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DRVVBUS_EXT);
 239
 240         if (on) {
 241                 if (otg->flags & ULPI_OTG_DRVVBUS)
 242                         flags |= ULPI_OTG_CTRL_DRVVBUS;
 243
 244                 if (otg->flags & ULPI_OTG_DRVVBUS_EXT)
 245                         flags |= ULPI_OTG_CTRL_DRVVBUS_EXT;
 246         }
 247
 248         return otg_io_write(otg, flags, ULPI_OTG_CTRL);
 249 }
 250
 251 struct otg_transceiver *
 252 otg_ulpi_create(struct otg_io_access_ops *ops,
 253                 unsigned int flags)
 254 {
 255         struct otg_transceiver *otg;
 256
 257         otg = kzalloc(sizeof(*otg), GFP_KERNEL);
 258         if (!otg)
 259                 return NULL;
 260
 261         otg->label      = "ULPI";
 262         otg->flags      = flags;
 263         otg->io_ops     = ops;
 264         otg->init       = ulpi_init;
 265         otg->set_host   = ulpi_set_host;
 266         otg->set_vbus   = ulpi_set_vbus;
 267
 268         return otg;
 269 }
 270 EXPORT_SYMBOL_GPL(otg_ulpi_create);
 271