/* * Generic ULPI USB transceiver support * * Copyright (C) 2009 Daniel Mack * * Based on sources from * * Sascha Hauer * 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 #include #include #include #include #include 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"), ULPI_INFO(ULPI_ID(0x0424, 0x0007), "SMSC USB3320"), ULPI_INFO(ULPI_ID(0x0424, 0x0009), "SMSC USB334x"), ULPI_INFO(ULPI_ID(0x0451, 0x1507), "TI TUSB1210"), }; static int ulpi_set_otg_flags(struct usb_phy *phy) { unsigned int flags = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN; if (phy->flags & ULPI_OTG_ID_PULLUP) flags |= ULPI_OTG_CTRL_ID_PULLUP; /* * ULPI Specification rev.1.1 default * for Dp/DmPulldown is enabled. */ if (phy->flags & ULPI_OTG_DP_PULLDOWN_DIS) flags &= ~ULPI_OTG_CTRL_DP_PULLDOWN; if (phy->flags & ULPI_OTG_DM_PULLDOWN_DIS) flags &= ~ULPI_OTG_CTRL_DM_PULLDOWN; if (phy->flags & ULPI_OTG_EXTVBUSIND) flags |= ULPI_OTG_CTRL_EXTVBUSIND; return usb_phy_io_write(phy, flags, ULPI_OTG_CTRL); } static int ulpi_set_fc_flags(struct usb_phy *phy) { unsigned int flags = 0; /* * ULPI Specification rev.1.1 default * for XcvrSelect is Full Speed. */ if (phy->flags & ULPI_FC_HS) flags |= ULPI_FUNC_CTRL_HIGH_SPEED; else if (phy->flags & ULPI_FC_LS) flags |= ULPI_FUNC_CTRL_LOW_SPEED; else if (phy->flags & ULPI_FC_FS4LS) flags |= ULPI_FUNC_CTRL_FS4LS; else flags |= ULPI_FUNC_CTRL_FULL_SPEED; if (phy->flags & ULPI_FC_TERMSEL) flags |= ULPI_FUNC_CTRL_TERMSELECT; /* * ULPI Specification rev.1.1 default * for OpMode is Normal Operation. */ if (phy->flags & ULPI_FC_OP_NODRV) flags |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING; else if (phy->flags & ULPI_FC_OP_DIS_NRZI) flags |= ULPI_FUNC_CTRL_OPMODE_DISABLE_NRZI; else if (phy->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 usb_phy_io_write(phy, flags, ULPI_FUNC_CTRL); } static int ulpi_set_ic_flags(struct usb_phy *phy) { unsigned int flags = 0; if (phy->flags & ULPI_IC_AUTORESUME) flags |= ULPI_IFC_CTRL_AUTORESUME; if (phy->flags & ULPI_IC_EXTVBUS_INDINV) flags |= ULPI_IFC_CTRL_EXTERNAL_VBUS; if (phy->flags & ULPI_IC_IND_PASSTHRU) flags |= ULPI_IFC_CTRL_PASSTHRU; if (phy->flags & ULPI_IC_PROTECT_DIS) flags |= ULPI_IFC_CTRL_PROTECT_IFC_DISABLE; return usb_phy_io_write(phy, flags, ULPI_IFC_CTRL); } static int ulpi_set_flags(struct usb_phy *phy) { int ret; ret = ulpi_set_otg_flags(phy); if (ret) return ret; ret = ulpi_set_ic_flags(phy); if (ret) return ret; return ulpi_set_fc_flags(phy); } static int ulpi_check_integrity(struct usb_phy *phy) { int ret, i; unsigned int val = 0x55; for (i = 0; i < 2; i++) { ret = usb_phy_io_write(phy, val, ULPI_SCRATCH); if (ret < 0) return ret; ret = usb_phy_io_read(phy, 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 usb_phy *phy) { int i, vid, pid, ret; u32 ulpi_id = 0; for (i = 0; i < 4; i++) { ret = usb_phy_io_read(phy, 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(phy); if (ret) return ret; return ulpi_set_flags(phy); } static int ulpi_set_host(struct usb_otg *otg, struct usb_bus *host) { struct usb_phy *phy = otg->usb_phy; unsigned int flags = usb_phy_io_read(phy, 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 (phy->flags & ULPI_IC_6PIN_SERIAL) flags |= ULPI_IFC_CTRL_6_PIN_SERIAL_MODE; else if (phy->flags & ULPI_IC_3PIN_SERIAL) flags |= ULPI_IFC_CTRL_3_PIN_SERIAL_MODE; else if (phy->flags & ULPI_IC_CARKIT) flags |= ULPI_IFC_CTRL_CARKITMODE; return usb_phy_io_write(phy, flags, ULPI_IFC_CTRL); } static int ulpi_set_vbus(struct usb_otg *otg, bool on) { struct usb_phy *phy = otg->usb_phy; unsigned int flags = usb_phy_io_read(phy, ULPI_OTG_CTRL); flags &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DRVVBUS_EXT); if (on) { if (phy->flags & ULPI_OTG_DRVVBUS) flags |= ULPI_OTG_CTRL_DRVVBUS; if (phy->flags & ULPI_OTG_DRVVBUS_EXT) flags |= ULPI_OTG_CTRL_DRVVBUS_EXT; } return usb_phy_io_write(phy, flags, ULPI_OTG_CTRL); } struct usb_phy * otg_ulpi_create(struct usb_phy_io_ops *ops, unsigned int flags) { struct usb_phy *phy; struct usb_otg *otg; phy = kzalloc(sizeof(*phy), GFP_KERNEL); if (!phy) return NULL; otg = kzalloc(sizeof(*otg), GFP_KERNEL); if (!otg) { kfree(phy); return NULL; } phy->label = "ULPI"; phy->flags = flags; phy->io_ops = ops; phy->otg = otg; phy->init = ulpi_init; otg->usb_phy = phy; otg->set_host = ulpi_set_host; otg->set_vbus = ulpi_set_vbus; return phy; } EXPORT_SYMBOL_GPL(otg_ulpi_create); commit-subject'>x86/mce: Make timer handling more robust
Erik reported that on a preproduction hardware a CMCI storm triggers the BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is started by the CMCI logic before the MCE CPU hotplug callback starts the timer with add_timer_on(). So the timer is already queued which triggers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/usb/gadget/epautoconf.c')