2d57a95f09
This adds a minimal generic driver for ULPI connected transceivers, using the OTG framework functions recently introduced. The driver got a table to match the ULPI chips, which currently only has one entry for NXP's ISP 1504 transceiver. Signed-off-by: Daniel Mack <daniel@caiaq.de> Cc: Heikki Krogerus <ext-heikki.krogerus@nokia.com> Cc: David Brownell <dbrownell@users.sourceforge.net> Cc: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
136 lines
4 KiB
C
136 lines
4 KiB
C
/*
|
|
* 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/usb.h>
|
|
#include <linux/usb/otg.h>
|
|
#include <linux/usb/ulpi.h>
|
|
|
|
/* ULPI register addresses */
|
|
#define ULPI_VID_LOW 0x00 /* Vendor ID low */
|
|
#define ULPI_VID_HIGH 0x01 /* Vendor ID high */
|
|
#define ULPI_PID_LOW 0x02 /* Product ID low */
|
|
#define ULPI_PID_HIGH 0x03 /* Product ID high */
|
|
#define ULPI_ITFCTL 0x07 /* Interface Control */
|
|
#define ULPI_OTGCTL 0x0A /* OTG Control */
|
|
|
|
/* add to above register address to access Set/Clear functions */
|
|
#define ULPI_REG_SET 0x01
|
|
#define ULPI_REG_CLEAR 0x02
|
|
|
|
/* ULPI OTG Control Register bits */
|
|
#define ID_PULL_UP (1 << 0) /* enable ID Pull Up */
|
|
#define DP_PULL_DOWN (1 << 1) /* enable DP Pull Down */
|
|
#define DM_PULL_DOWN (1 << 2) /* enable DM Pull Down */
|
|
#define DISCHRG_VBUS (1 << 3) /* Discharge Vbus */
|
|
#define CHRG_VBUS (1 << 4) /* Charge Vbus */
|
|
#define DRV_VBUS (1 << 5) /* Drive Vbus */
|
|
#define DRV_VBUS_EXT (1 << 6) /* Drive Vbus external */
|
|
#define USE_EXT_VBUS_IND (1 << 7) /* Use ext. Vbus indicator */
|
|
|
|
#define ULPI_ID(vendor, product) (((vendor) << 16) | (product))
|
|
|
|
#define TR_FLAG(flags, a, b) (((flags) & a) ? b : 0)
|
|
|
|
/* 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 |= ID_PULL_UP;
|
|
|
|
if (otg->flags & USB_OTG_PULLDOWN_DM)
|
|
flags |= DM_PULL_DOWN;
|
|
|
|
if (otg->flags & USB_OTG_PULLDOWN_DP)
|
|
flags |= DP_PULL_DOWN;
|
|
|
|
if (otg->flags & USB_OTG_EXT_VBUS_INDICATOR)
|
|
flags |= USE_EXT_VBUS_IND;
|
|
|
|
return otg_io_write(otg, flags, ULPI_OTGCTL + ULPI_REG_SET);
|
|
}
|
|
|
|
static int ulpi_init(struct otg_transceiver *otg)
|
|
{
|
|
int i, vid, pid;
|
|
|
|
vid = (otg_io_read(otg, ULPI_VID_HIGH) << 8) |
|
|
otg_io_read(otg, ULPI_VID_LOW);
|
|
pid = (otg_io_read(otg, ULPI_PID_HIGH) << 8) |
|
|
otg_io_read(otg, ULPI_PID_LOW);
|
|
|
|
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_OTGCTL);
|
|
|
|
flags &= ~(DRV_VBUS | DRV_VBUS_EXT);
|
|
|
|
if (on) {
|
|
if (otg->flags & USB_OTG_DRV_VBUS)
|
|
flags |= DRV_VBUS;
|
|
|
|
if (otg->flags & USB_OTG_DRV_VBUS_EXT)
|
|
flags |= DRV_VBUS_EXT;
|
|
}
|
|
|
|
return otg_io_write(otg, flags, ULPI_OTGCTL + ULPI_REG_SET);
|
|
}
|
|
|
|
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);
|
|
|