94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
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// 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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