/*
* 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/usb.h>
#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>
#define ULPI_ID(vendor, product) (((vendor) << 16) | (product))
/* ULPI hardcoded IDs, used for probing */
static unsigned int ulpi_ids[] = {
ULPI_ID(0x04cc, 0x1504), /* NXP ISP1504 */
};
static int ulpi_set_flags(struct otg_transceiver *otg)
{
unsigned int flags = 0;
if (otg->flags & USB_OTG_PULLUP_ID)
flags |= ULPI_OTG_CTRL_ID_PULLUP;
if (otg->flags & USB_OTG_PULLDOWN_DM)
flags |= ULPI_OTG_CTRL_DM_PULLDOWN;
if (otg->flags & USB_OTG_PULLDOWN_DP)
flags |= ULPI_OTG_CTRL_DP_PULLDOWN;
if (otg->flags & USB_OTG_EXT_VBUS_INDICATOR)
flags |= ULPI_OTG_CTRL_EXTVBUSIND;
return otg_io_write(otg, flags, ULPI_OTG_CTRL);
}
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] == ULPI_ID(vid, pid))
return ulpi_set_flags(otg);
pr_err("ULPI ID does not match any known transceiver.\n");
return -ENODEV;
}
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 & USB_OTG_DRV_VBUS)
flags |= ULPI_OTG_CTRL_DRVVBUS;
if (otg->flags & USB_OTG_DRV_VBUS_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_vbus = ulpi_set_vbus;
return otg;
}
EXPORT_SYMBOL_GPL(otg_ulpi_create);
