/* * Wireless Host Controller (WHC) hardware access helpers. * * Copyright (C) 2007 Cambridge Silicon Radio Ltd. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. * * 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, see . */ #include #include #include #include "../../wusbcore/wusbhc.h" #include "whcd.h" void whc_write_wusbcmd(struct whc *whc, u32 mask, u32 val) { unsigned long flags; u32 cmd; spin_lock_irqsave(&whc->lock, flags); cmd = le_readl(whc->base + WUSBCMD); cmd = (cmd & ~mask) | val; le_writel(cmd, whc->base + WUSBCMD); spin_unlock_irqrestore(&whc->lock, flags); } /** * whc_do_gencmd - start a generic command via the WUSBGENCMDSTS register * @whc: the WHCI HC * @cmd: command to start. * @params: parameters for the command (the WUSBGENCMDPARAMS register value). * @addr: pointer to any data for the command (may be NULL). * @len: length of the data (if any). */ int whc_do_gencmd(struct whc *whc, u32 cmd, u32 params, void *addr, size_t len) { unsigned long flags; dma_addr_t dma_addr; int t; int ret = 0; mutex_lock(&whc->mutex); /* Wait for previous command to complete. */ t = wait_event_timeout(whc->cmd_wq, (le_readl(whc->base + WUSBGENCMDSTS) & WUSBGENCMDSTS_ACTIVE) == 0, WHC_GENCMD_TIMEOUT_MS); if (t == 0) { dev_err(&whc->umc->dev, "generic command timeout (%04x/%04x)\n", le_readl(whc->base + WUSBGENCMDSTS), le_readl(whc->base + WUSBGENCMDPARAMS)); ret = -ETIMEDOUT; goto out; } if (addr) { memcpy(whc->gen_cmd_buf, addr, len); dma_addr = whc->gen_cmd_buf_dma; } else dma_addr = 0; /* Poke registers to start cmd. */ spin_lock_irqsave(&whc->lock, flags); le_writel(params, whc->base + WUSBGENCMDPARAMS); le_writeq(dma_addr, whc->base + WUSBGENADDR); le_writel(WUSBGENCMDSTS_ACTIVE | WUSBGENCMDSTS_IOC | cmd, whc->base + WUSBGENCMDSTS); spin_unlock_irqrestore(&whc->lock, flags); out: mutex_unlock(&whc->mutex); return ret; } /** * whc_hw_error - recover from a hardware error * @whc: the WHCI HC that broke. * @reason: a description of the failure. * * Recover from broken hardware with a full reset. */ void whc_hw_error(struct whc *whc, const char *reason) { struct wusbhc *wusbhc = &whc->wusbhc; dev_err(&whc->umc->dev, "hardware error: %s\n", reason); wusbhc_reset_all(wusbhc); } 03ab15709dbbaf90d3dd1'>tools/lib/traceevent
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authorAlexander Stein <alexander.stein@systec-electronic.com>2017-01-30 12:35:28 +0100
committerLinus Walleij <linus.walleij@linaro.org>2017-01-30 15:53:57 +0100
commitcdca06e4e85974d8a3503ab15709dbbaf90d3dd1 (patch)
tree268b0c01070a957006db97c88dccb5fb061440ff /tools/lib/traceevent
parent1b89970d81bbd52720fc64a3fe9572ee33588363 (diff)
pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler
According to VLI64 Intel Atom E3800 Specification Update (#329901) concurrent read accesses may result in returning 0xffffffff and write accesses may be dropped silently. To workaround all accesses must be protected by locks. Cc: stable@vger.kernel.org Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'tools/lib/traceevent')