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USB OTG: Add generic driver for ULPI OTG transceiver

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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>
This commit is contained in:
Daniel Mack 2009-10-15 17:09:35 +03:00 committed by Greg Kroah-Hartman
parent 91c8a5a998
commit 2d57a95f09
5 changed files with 155 additions and 0 deletions
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2
drivers/usb/Makefile
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@ -44,3 +44,5 @@ obj-y += early/
obj-$(CONFIG_USB_ATM) += atm/
obj-$(CONFIG_USB_SPEEDTOUCH) += atm/
obj-$(CONFIG_USB_ULPI) += otg/

9
drivers/usb/otg/Kconfig
View file

@ -41,6 +41,15 @@ config ISP1301_OMAP
This driver can also be built as a module. If so, the module
will be called isp1301_omap.
config USB_ULPI
bool "Generic ULPI Transceiver Driver"
depends on ARM
help
Enable this to support ULPI connected USB OTG transceivers which
are likely found on embedded boards.
The only chip currently supported is NXP's ISP1504
config TWL4030_USB
tristate "TWL4030 USB Transceiver Driver"
depends on TWL4030_CORE && REGULATOR_TWL4030

1
drivers/usb/otg/Makefile
View file

@ -10,6 +10,7 @@ obj-$(CONFIG_USB_GPIO_VBUS) += gpio_vbus.o
obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o
obj-$(CONFIG_TWL4030_USB) += twl4030-usb.o
obj-$(CONFIG_NOP_USB_XCEIV) += nop-usb-xceiv.o
obj-$(CONFIG_USB_ULPI) += ulpi.o
ccflags-$(CONFIG_USB_DEBUG) += -DDEBUG
ccflags-$(CONFIG_USB_GADGET_DEBUG) += -DDEBUG

136
drivers/usb/otg/ulpi.c Normal file
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@ -0,0 +1,136 @@
/*
* 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);

7
include/linux/usb/ulpi.h Normal file
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@ -0,0 +1,7 @@
#ifndef __LINUX_USB_ULPI_H
#define __LINUX_USB_ULPI_H
struct otg_transceiver *otg_ulpi_create(struct otg_io_access_ops *ops,
unsigned int flags);
#endif /* __LINUX_USB_ULPI_H */