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/*
* Generic ULPI USB transceiver support
*
* Copyright (C) 2009 Daniel Mack <daniel@caiaq.de>
*
* Based on sources from
*
* Sascha Hauer <s.hauer@pengutronix.de>
* Freescale Semiconductors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/usb.h>
#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>
struct ulpi_info {
unsigned int id;
char *name;
};
#define ULPI_ID(vendor, product) (((vendor) << 16) | (product))
#define ULPI_INFO(_id, _name) \
{ \
.id = (_id), \
.name = (_name), \
}
/* ULPI hardcoded IDs, used for probing */
static struct ulpi_info ulpi_ids[] = {
ULPI_INFO(ULPI_ID(0x04cc, 0x1504), "NXP ISP1504"),
ULPI_INFO(ULPI_ID(0x0424, 0x0006), "SMSC USB331x"),
};
static int ulpi_set_otg_flags(struct otg_transceiver *otg)
{
unsigned int flags = ULPI_OTG_CTRL_DP_PULLDOWN |
ULPI_OTG_CTRL_DM_PULLDOWN;
if (otg->flags & ULPI_OTG_ID_PULLUP)
flags |= ULPI_OTG_CTRL_ID_PULLUP;
/*
* ULPI Specification rev.1.1 default
* for Dp/DmPulldown is enabled.
*/
if (otg->flags & ULPI_OTG_DP_PULLDOWN_DIS)
flags &= ~ULPI_OTG_CTRL_DP_PULLDOWN;
if (otg->flags & ULPI_OTG_DM_PULLDOWN_DIS)
flags &= ~ULPI_OTG_CTRL_DM_PULLDOWN;
if (otg->flags & ULPI_OTG_EXTVBUSIND)
flags |= ULPI_OTG_CTRL_EXTVBUSIND;
return otg_io_write(otg, flags, ULPI_OTG_CTRL);
}
static int ulpi_set_fc_flags(struct otg_transceiver *otg)
{
unsigned int flags = 0;
/*
* ULPI Specification rev.1.1 default
* for XcvrSelect is Full Speed.
*/
if (otg->flags & ULPI_FC_HS)
flags |= ULPI_FUNC_CTRL_HIGH_SPEED;
else if (otg->flags & ULPI_FC_LS)
flags |= ULPI_FUNC_CTRL_LOW_SPEED;
else if (otg->flags & ULPI_FC_FS4LS)
flags |= ULPI_FUNC_CTRL_FS4LS;
else
flags |= ULPI_FUNC_CTRL_FULL_SPEED;
if (otg->flags & ULPI_FC_TERMSEL)
flags |= ULPI_FUNC_CTRL_TERMSELECT;
/*
* ULPI Specification rev.1.1 default
* for OpMode is Normal Operation.
*/
if (otg->flags & ULPI_FC_OP_NODRV)
flags |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
else if (otg->flags & ULPI_FC_OP_DIS_NRZI)
flags |= ULPI_FUNC_CTRL_OPMODE_DISABLE_NRZI;
else if (otg->flags & ULPI_FC_OP_NSYNC_NEOP)
flags |= ULPI_FUNC_CTRL_OPMODE_NOSYNC_NOEOP;
else
flags |= ULPI_FUNC_CTRL_OPMODE_NORMAL;
/*
* ULPI Specification rev.1.1 default
* for SuspendM is Powered.
*/
flags |= ULPI_FUNC_CTRL_SUSPENDM;
return otg_io_write(otg, flags, ULPI_FUNC_CTRL);
}
static int ulpi_set_ic_flags(struct otg_transceiver *otg)
{
unsigned int flags = 0;
if (otg->flags & ULPI_IC_AUTORESUME)
flags |= ULPI_IFC_CTRL_AUTORESUME;
if (otg->flags & ULPI_IC_EXTVBUS_INDINV)
flags |= ULPI_IFC_CTRL_EXTERNAL_VBUS;
if (otg->flags & ULPI_IC_IND_PASSTHRU)
flags |= ULPI_IFC_CTRL_PASSTHRU;
if (otg->flags & ULPI_IC_PROTECT_DIS)
flags |= ULPI_IFC_CTRL_PROTECT_IFC_DISABLE;
return otg_io_write(otg, flags, ULPI_IFC_CTRL);
}
static int ulpi_set_flags(struct otg_transceiver *otg)
{
int ret;
ret = ulpi_set_otg_flags(otg);
if (ret)
return ret;
ret = ulpi_set_ic_flags(otg);
if (ret)
return ret;
return ulpi_set_fc_flags(otg);
}
static int ulpi_check_integrity(struct otg_transceiver *otg)
{
int ret, i;
unsigned int val = 0x55;
for (i = 0; i < 2; i++) {
ret = otg_io_write(otg, val, ULPI_SCRATCH);
if (ret < 0)
return ret;
ret = otg_io_read(otg, ULPI_SCRATCH);
if (ret < 0)
return ret;
if (ret != val) {
pr_err("ULPI integrity check: failed!");
return -ENODEV;
}
val = val << 1;
}
pr_info("ULPI integrity check: passed.\n");
return 0;
}
static int ulpi_init(struct otg_transceiver *otg)
{
int i, vid, pid, ret;
u32 ulpi_id = 0;
for (i = 0; i < 4; i++) {
ret = otg_io_read(otg, ULPI_PRODUCT_ID_HIGH - i);
if (ret < 0)
return ret;
ulpi_id = (ulpi_id << 8) | ret;
}
vid = ulpi_id & 0xffff;
pid = ulpi_id >> 16;
pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid);
for (i = 0; i < ARRAY_SIZE(ulpi_ids); i++) {
if (ulpi_ids[i].id == ULPI_ID(vid, pid)) {
pr_info("Found %s ULPI transceiver.\n",
ulpi_ids[i].name);
break;
}
}
ret = ulpi_check_integrity(otg);
if (ret)
return ret;
return ulpi_set_flags(otg);
}
static int ulpi_set_host(struct otg_transceiver *otg, struct usb_bus *host)
{
unsigned int flags = otg_io_read(otg, ULPI_IFC_CTRL);
if (!host) {
otg->host = NULL;
return 0;
}
otg->host = host;
flags &= ~(ULPI_IFC_CTRL_6_PIN_SERIAL_MODE |
ULPI_IFC_CTRL_3_PIN_SERIAL_MODE |
ULPI_IFC_CTRL_CARKITMODE);
if (otg->flags & ULPI_IC_6PIN_SERIAL)
flags |= ULPI_IFC_CTRL_6_PIN_SERIAL_MODE;
else if (otg->flags & ULPI_IC_3PIN_SERIAL)
flags |= ULPI_IFC_CTRL_3_PIN_SERIAL_MODE;
else if (otg->flags & ULPI_IC_CARKIT)
flags |= ULPI_IFC_CTRL_CARKITMODE;
return otg_io_write(otg, flags, ULPI_IFC_CTRL);
}
static int ulpi_set_vbus(struct otg_transceiver *otg, bool on)
{
unsigned int flags = otg_io_read(otg, ULPI_OTG_CTRL);
flags &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DRVVBUS_EXT);
if (on) {
if (otg->flags & ULPI_OTG_DRVVBUS)
flags |= ULPI_OTG_CTRL_DRVVBUS;
if (otg->flags & ULPI_OTG_DRVVBUS_EXT)
flags |= ULPI_OTG_CTRL_DRVVBUS_EXT;
}
return otg_io_write(otg, flags, ULPI_OTG_CTRL);
}
struct otg_transceiver *
otg_ulpi_create(struct otg_io_access_ops *ops,
unsigned int flags)
{
struct otg_transceiver *otg;
otg = kzalloc(sizeof(*otg), GFP_KERNEL);
if (!otg)
return NULL;
otg->label = "ULPI";
otg->flags = flags;
otg->io_ops = ops;
otg->init = ulpi_init;
otg->set_host = ulpi_set_host;
otg->set_vbus = ulpi_set_vbus;
return otg;
}
EXPORT_SYMBOL_GPL(otg_ulpi_create);
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