/* * 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/slab.h> #include <linux/usb.h> #include <linux/usb/otg.h> #include <linux/usb/ulpi.h> struct ulpi_info { unsigned int id; char *name; }; #define ULPI_ID(vendor, product) (((vendor) << 16) | (product)) #define ULPI_INFO(_id, _name) \ { \ .id = (_id), \ .name = (_name), \ } /* ULPI hardcoded IDs, used for probing */ static struct ulpi_info ulpi_ids[] = { ULPI_INFO(ULPI_ID(0x04cc, 0x1504), "NXP ISP1504"), ULPI_INFO(ULPI_ID(0x0424, 0x0006), "SMSC USB331x"), }; static int ulpi_set_otg_flags(struct otg_transceiver *otg) { unsigned int flags = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN; if (otg->flags & ULPI_OTG_ID_PULLUP) flags |= ULPI_OTG_CTRL_ID_PULLUP; /* * ULPI Specification rev.1.1 default * for Dp/DmPulldown is enabled. */ if (otg->flags & ULPI_OTG_DP_PULLDOWN_DIS) flags &= ~ULPI_OTG_CTRL_DP_PULLDOWN; if (otg->flags & ULPI_OTG_DM_PULLDOWN_DIS) flags &= ~ULPI_OTG_CTRL_DM_PULLDOWN; if (otg->flags & ULPI_OTG_EXTVBUSIND) flags |= ULPI_OTG_CTRL_EXTVBUSIND; return otg_io_write(otg, flags, ULPI_OTG_CTRL); } static int ulpi_set_fc_flags(struct otg_transceiver *otg) { unsigned int flags = 0; /* * ULPI Specification rev.1.1 default * for XcvrSelect is Full Speed. */ if (otg->flags & ULPI_FC_HS) flags |= ULPI_FUNC_CTRL_HIGH_SPEED; else if (otg->flags & ULPI_FC_LS) flags |= ULPI_FUNC_CTRL_LOW_SPEED; else if (otg->flags & ULPI_FC_FS4LS) flags |= ULPI_FUNC_CTRL_FS4LS; else flags |= ULPI_FUNC_CTRL_FULL_SPEED; if (otg->flags & ULPI_FC_TERMSEL) flags |= ULPI_FUNC_CTRL_TERMSELECT; /* * ULPI Specification rev.1.1 default * for OpMode is Normal Operation. */ if (otg->flags & ULPI_FC_OP_NODRV) flags |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING; else if (otg->flags & ULPI_FC_OP_DIS_NRZI) flags |= ULPI_FUNC_CTRL_OPMODE_DISABLE_NRZI; else if (otg->flags & ULPI_FC_OP_NSYNC_NEOP) flags |= ULPI_FUNC_CTRL_OPMODE_NOSYNC_NOEOP; else flags |= ULPI_FUNC_CTRL_OPMODE_NORMAL; /* * ULPI Specification rev.1.1 default * for SuspendM is Powered. */ flags |= ULPI_FUNC_CTRL_SUSPENDM; return otg_io_write(otg, flags, ULPI_FUNC_CTRL); } static int ulpi_set_ic_flags(struct otg_transceiver *otg) { unsigned int flags = 0; if (otg->flags & ULPI_IC_AUTORESUME) flags |= ULPI_IFC_CTRL_AUTORESUME; if (otg->flags & ULPI_IC_EXTVBUS_INDINV) flags |= ULPI_IFC_CTRL_EXTERNAL_VBUS; if (otg->flags & ULPI_IC_IND_PASSTHRU) flags |= ULPI_IFC_CTRL_PASSTHRU; if (otg->flags & ULPI_IC_PROTECT_DIS) flags |= ULPI_IFC_CTRL_PROTECT_IFC_DISABLE; return otg_io_write(otg, flags, ULPI_IFC_CTRL); } static int ulpi_set_flags(struct otg_transceiver *otg) { int ret; ret = ulpi_set_otg_flags(otg); if (ret) return ret; ret = ulpi_set_ic_flags(otg); if (ret) return ret; return ulpi_set_fc_flags(otg); } static int ulpi_check_integrity(struct otg_transceiver *otg) { int ret, i; unsigned int val = 0x55; for (i = 0; i < 2; i++) { ret = otg_io_write(otg, val, ULPI_SCRATCH); if (ret < 0) return ret; ret = otg_io_read(otg, ULPI_SCRATCH); if (ret < 0) return ret; if (ret != val) { pr_err("ULPI integrity check: failed!"); return -ENODEV; } val = val << 1; } pr_info("ULPI integrity check: passed.\n"); return 0; } static int ulpi_init(struct otg_transceiver *otg) { int i, vid, pid, ret; u32 ulpi_id = 0; for (i = 0; i < 4; i++) { ret = otg_io_read(otg, ULPI_PRODUCT_ID_HIGH - i); if (ret < 0) return ret; ulpi_id = (ulpi_id << 8) | ret; } vid = ulpi_id & 0xffff; pid = ulpi_id >> 16; 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].id == ULPI_ID(vid, pid)) { pr_info("Found %s ULPI transceiver.\n", ulpi_ids[i].name); break; } } ret = ulpi_check_integrity(otg); if (ret) return ret; return ulpi_set_flags(otg); } static int ulpi_set_host(struct otg_transceiver *otg, struct usb_bus *host) { unsigned int flags = otg_io_read(otg, ULPI_IFC_CTRL); if (!host) { otg->host = NULL; return 0; } otg->host = host; flags &= ~(ULPI_IFC_CTRL_6_PIN_SERIAL_MODE | ULPI_IFC_CTRL_3_PIN_SERIAL_MODE | ULPI_IFC_CTRL_CARKITMODE); if (otg->flags & ULPI_IC_6PIN_SERIAL) flags |= ULPI_IFC_CTRL_6_PIN_SERIAL_MODE; else if (otg->flags & ULPI_IC_3PIN_SERIAL) flags |= ULPI_IFC_CTRL_3_PIN_SERIAL_MODE; else if (otg->flags & ULPI_IC_CARKIT) flags |= ULPI_IFC_CTRL_CARKITMODE; return otg_io_write(otg, flags, ULPI_IFC_CTRL); } static int ulpi_set_vbus(struct otg_transceiver *otg, bool on) { unsigned int flags = otg_io_read(otg, ULPI_OTG_CTRL); flags &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DRVVBUS_EXT); if (on) { if (otg->flags & ULPI_OTG_DRVVBUS) flags |= ULPI_OTG_CTRL_DRVVBUS; if (otg->flags & ULPI_OTG_DRVVBUS_EXT) flags |= ULPI_OTG_CTRL_DRVVBUS_EXT; } return otg_io_write(otg, flags, ULPI_OTG_CTRL); } 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_host = ulpi_set_host; otg->set_vbus = ulpi_set_vbus; return otg; } EXPORT_SYMBOL_GPL(otg_ulpi_create);