3905118912
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Felipe Balbi <felipe.balbi@linux.intel.com> Cc: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Wireless Host Controller (WHC) hardware access helpers.
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*
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* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/dma-mapping.h>
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#include <linux/uwb/umc.h>
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#include "../../wusbcore/wusbhc.h"
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#include "whcd.h"
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void whc_write_wusbcmd(struct whc *whc, u32 mask, u32 val)
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{
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unsigned long flags;
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u32 cmd;
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spin_lock_irqsave(&whc->lock, flags);
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cmd = le_readl(whc->base + WUSBCMD);
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cmd = (cmd & ~mask) | val;
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le_writel(cmd, whc->base + WUSBCMD);
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spin_unlock_irqrestore(&whc->lock, flags);
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}
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/**
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* whc_do_gencmd - start a generic command via the WUSBGENCMDSTS register
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* @whc: the WHCI HC
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* @cmd: command to start.
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* @params: parameters for the command (the WUSBGENCMDPARAMS register value).
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* @addr: pointer to any data for the command (may be NULL).
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* @len: length of the data (if any).
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*/
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int whc_do_gencmd(struct whc *whc, u32 cmd, u32 params, void *addr, size_t len)
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{
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unsigned long flags;
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dma_addr_t dma_addr;
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int t;
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int ret = 0;
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mutex_lock(&whc->mutex);
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/* Wait for previous command to complete. */
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t = wait_event_timeout(whc->cmd_wq,
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(le_readl(whc->base + WUSBGENCMDSTS) & WUSBGENCMDSTS_ACTIVE) == 0,
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WHC_GENCMD_TIMEOUT_MS);
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if (t == 0) {
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dev_err(&whc->umc->dev, "generic command timeout (%04x/%04x)\n",
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le_readl(whc->base + WUSBGENCMDSTS),
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le_readl(whc->base + WUSBGENCMDPARAMS));
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ret = -ETIMEDOUT;
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goto out;
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}
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if (addr) {
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memcpy(whc->gen_cmd_buf, addr, len);
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dma_addr = whc->gen_cmd_buf_dma;
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} else
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dma_addr = 0;
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/* Poke registers to start cmd. */
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spin_lock_irqsave(&whc->lock, flags);
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le_writel(params, whc->base + WUSBGENCMDPARAMS);
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le_writeq(dma_addr, whc->base + WUSBGENADDR);
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le_writel(WUSBGENCMDSTS_ACTIVE | WUSBGENCMDSTS_IOC | cmd,
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whc->base + WUSBGENCMDSTS);
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spin_unlock_irqrestore(&whc->lock, flags);
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out:
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mutex_unlock(&whc->mutex);
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return ret;
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}
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/**
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* whc_hw_error - recover from a hardware error
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* @whc: the WHCI HC that broke.
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* @reason: a description of the failure.
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*
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* Recover from broken hardware with a full reset.
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*/
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void whc_hw_error(struct whc *whc, const char *reason)
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{
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struct wusbhc *wusbhc = &whc->wusbhc;
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dev_err(&whc->umc->dev, "hardware error: %s\n", reason);
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wusbhc_reset_all(wusbhc);
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}
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