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+/*
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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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+
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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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+
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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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+
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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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+
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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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+
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+#define ULPI_ID(vendor, product) (((vendor) << 16) | (product))
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+
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+#define TR_FLAG(flags, a, b) (((flags) & a) ? b : 0)
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+
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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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+
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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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+
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+ if (otg->flags & USB_OTG_PULLUP_ID)
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+ flags |= ID_PULL_UP;
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+
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+ if (otg->flags & USB_OTG_PULLDOWN_DM)
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+ flags |= DM_PULL_DOWN;
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+
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+ if (otg->flags & USB_OTG_PULLDOWN_DP)
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+ flags |= DP_PULL_DOWN;
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+
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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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+
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+ return otg_io_write(otg, flags, ULPI_OTGCTL + ULPI_REG_SET);
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+}
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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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+
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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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+
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+ pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid);
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+
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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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+
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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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+
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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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+
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+ flags &= ~(DRV_VBUS | DRV_VBUS_EXT);
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+
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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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+
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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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+
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+ return otg_io_write(otg, flags, ULPI_OTGCTL + ULPI_REG_SET);
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+}
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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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+
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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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+
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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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+
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+ return otg;
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+}
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+EXPORT_SYMBOL_GPL(otg_ulpi_create);
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+
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