2 * Generic ULPI USB transceiver support
4 * Copyright (C) 2009 Daniel Mack <daniel@caiaq.de>
6 * Based on sources from
8 * Sascha Hauer <s.hauer@pengutronix.de>
9 * Freescale Semiconductors
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/usb.h>
29 #include <linux/usb/otg.h>
30 #include <linux/usb/ulpi.h>
32 #define ULPI_ID(vendor, product) (((vendor) << 16) | (product))
34 /* ULPI hardcoded IDs, used for probing */
35 static unsigned int ulpi_ids[] = {
36 ULPI_ID(0x04cc, 0x1504), /* NXP ISP1504 */
39 static int ulpi_set_flags(struct otg_transceiver *otg)
41 unsigned int flags = 0;
43 if (otg->flags & USB_OTG_PULLUP_ID)
44 flags |= ULPI_OTG_CTRL_ID_PULLUP;
46 if (otg->flags & USB_OTG_PULLDOWN_DM)
47 flags |= ULPI_OTG_CTRL_DM_PULLDOWN;
49 if (otg->flags & USB_OTG_PULLDOWN_DP)
50 flags |= ULPI_OTG_CTRL_DP_PULLDOWN;
52 if (otg->flags & USB_OTG_EXT_VBUS_INDICATOR)
53 flags |= ULPI_OTG_CTRL_EXTVBUSIND;
55 return otg_io_write(otg, flags, ULPI_OTG_CTRL);
58 static int ulpi_init(struct otg_transceiver *otg)
63 for (i = 0; i < 4; i++) {
64 ret = otg_io_read(otg, ULPI_PRODUCT_ID_HIGH - i);
67 ulpi_id = (ulpi_id << 8) | ret;
69 vid = ulpi_id & 0xffff;
72 pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid);
74 for (i = 0; i < ARRAY_SIZE(ulpi_ids); i++)
75 if (ulpi_ids[i] == ULPI_ID(vid, pid))
76 return ulpi_set_flags(otg);
78 pr_err("ULPI ID does not match any known transceiver.\n");
82 static int ulpi_set_vbus(struct otg_transceiver *otg, bool on)
84 unsigned int flags = otg_io_read(otg, ULPI_OTG_CTRL);
86 flags &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DRVVBUS_EXT);
89 if (otg->flags & USB_OTG_DRV_VBUS)
90 flags |= ULPI_OTG_CTRL_DRVVBUS;
92 if (otg->flags & USB_OTG_DRV_VBUS_EXT)
93 flags |= ULPI_OTG_CTRL_DRVVBUS_EXT;
96 return otg_io_write(otg, flags, ULPI_OTG_CTRL);
99 struct otg_transceiver *
100 otg_ulpi_create(struct otg_io_access_ops *ops,
103 struct otg_transceiver *otg;
105 otg = kzalloc(sizeof(*otg), GFP_KERNEL);
112 otg->init = ulpi_init;
113 otg->set_vbus = ulpi_set_vbus;
117 EXPORT_SYMBOL_GPL(otg_ulpi_create);