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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>
137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*
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* Generic ULPI USB transceiver support
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*
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* Copyright (C) 2009 Daniel Mack <daniel@caiaq.de>
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*
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* Based on sources from
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*
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* Sascha Hauer <s.hauer@pengutronix.de>
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* Freescale Semiconductors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/usb.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/ulpi.h>
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/* ULPI register addresses */
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#define ULPI_VID_LOW 0x00 /* Vendor ID low */
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#define ULPI_VID_HIGH 0x01 /* Vendor ID high */
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#define ULPI_PID_LOW 0x02 /* Product ID low */
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#define ULPI_PID_HIGH 0x03 /* Product ID high */
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#define ULPI_ITFCTL 0x07 /* Interface Control */
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#define ULPI_OTGCTL 0x0A /* OTG Control */
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/* add to above register address to access Set/Clear functions */
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#define ULPI_REG_SET 0x01
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#define ULPI_REG_CLEAR 0x02
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/* ULPI OTG Control Register bits */
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#define ID_PULL_UP (1 << 0) /* enable ID Pull Up */
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#define DP_PULL_DOWN (1 << 1) /* enable DP Pull Down */
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#define DM_PULL_DOWN (1 << 2) /* enable DM Pull Down */
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#define DISCHRG_VBUS (1 << 3) /* Discharge Vbus */
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#define CHRG_VBUS (1 << 4) /* Charge Vbus */
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#define DRV_VBUS (1 << 5) /* Drive Vbus */
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#define DRV_VBUS_EXT (1 << 6) /* Drive Vbus external */
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#define USE_EXT_VBUS_IND (1 << 7) /* Use ext. Vbus indicator */
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#define ULPI_ID(vendor, product) (((vendor) << 16) | (product))
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#define TR_FLAG(flags, a, b) (((flags) & a) ? b : 0)
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/* ULPI hardcoded IDs, used for probing */
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static unsigned int ulpi_ids[] = {
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ULPI_ID(0x04cc, 0x1504), /* NXP ISP1504 */
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};
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static int ulpi_set_flags(struct otg_transceiver *otg)
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{
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unsigned int flags = 0;
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if (otg->flags & USB_OTG_PULLUP_ID)
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flags |= ID_PULL_UP;
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if (otg->flags & USB_OTG_PULLDOWN_DM)
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flags |= DM_PULL_DOWN;
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if (otg->flags & USB_OTG_PULLDOWN_DP)
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flags |= DP_PULL_DOWN;
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if (otg->flags & USB_OTG_EXT_VBUS_INDICATOR)
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flags |= USE_EXT_VBUS_IND;
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return otg_io_write(otg, flags, ULPI_OTGCTL + ULPI_REG_SET);
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}
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static int ulpi_init(struct otg_transceiver *otg)
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{
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int i, vid, pid;
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vid = (otg_io_read(otg, ULPI_VID_HIGH) << 8) |
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otg_io_read(otg, ULPI_VID_LOW);
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pid = (otg_io_read(otg, ULPI_PID_HIGH) << 8) |
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otg_io_read(otg, ULPI_PID_LOW);
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pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid);
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for (i = 0; i < ARRAY_SIZE(ulpi_ids); i++)
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if (ulpi_ids[i] == ULPI_ID(vid, pid))
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return ulpi_set_flags(otg);
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pr_err("ULPI ID does not match any known transceiver.\n");
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return -ENODEV;
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}
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static int ulpi_set_vbus(struct otg_transceiver *otg, bool on)
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{
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unsigned int flags = otg_io_read(otg, ULPI_OTGCTL);
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flags &= ~(DRV_VBUS | DRV_VBUS_EXT);
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if (on) {
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if (otg->flags & USB_OTG_DRV_VBUS)
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flags |= DRV_VBUS;
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if (otg->flags & USB_OTG_DRV_VBUS_EXT)
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flags |= DRV_VBUS_EXT;
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}
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return otg_io_write(otg, flags, ULPI_OTGCTL + ULPI_REG_SET);
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}
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struct otg_transceiver *
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otg_ulpi_create(struct otg_io_access_ops *ops,
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unsigned int flags)
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{
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struct otg_transceiver *otg;
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otg = kzalloc(sizeof(*otg), GFP_KERNEL);
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if (!otg)
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return NULL;
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otg->label = "ULPI";
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otg->flags = flags;
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otg->io_ops = ops;
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otg->init = ulpi_init;
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otg->set_vbus = ulpi_set_vbus;
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return otg;
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}
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EXPORT_SYMBOL_GPL(otg_ulpi_create);
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