LXR linux/drivers/usb/host/whci/hw.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Wireless Host Controller (WHC) hardware access helpers.
   4 *
   5 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
   6 */
   7#include <linux/kernel.h>
   8#include <linux/dma-mapping.h>
   9#include <linux/uwb/umc.h>
  10
  11#include "../../wusbcore/wusbhc.h"
  12
  13#include "whcd.h"
  14
  15void whc_write_wusbcmd(struct whc *whc, u32 mask, u32 val)
  16{
  17        unsigned long flags;
  18        u32 cmd;
  19
  20        spin_lock_irqsave(&whc->lock, flags);
  21
  22        cmd = le_readl(whc->base + WUSBCMD);
  23        cmd = (cmd & ~mask) | val;
  24        le_writel(cmd, whc->base + WUSBCMD);
  25
  26        spin_unlock_irqrestore(&whc->lock, flags);
  27}
  28
  29/**
  30 * whc_do_gencmd - start a generic command via the WUSBGENCMDSTS register
  31 * @whc:    the WHCI HC
  32 * @cmd:    command to start.
  33 * @params: parameters for the command (the WUSBGENCMDPARAMS register value).
  34 * @addr:   pointer to any data for the command (may be NULL).
  35 * @len:    length of the data (if any).
  36 */
  37int whc_do_gencmd(struct whc *whc, u32 cmd, u32 params, void *addr, size_t len)
  38{
  39        unsigned long flags;
  40        dma_addr_t dma_addr;
  41        int t;
  42        int ret = 0;
  43
  44        mutex_lock(&whc->mutex);
  45
  46        /* Wait for previous command to complete. */
  47        t = wait_event_timeout(whc->cmd_wq,
  48                               (le_readl(whc->base + WUSBGENCMDSTS) & WUSBGENCMDSTS_ACTIVE) == 0,
  49                               WHC_GENCMD_TIMEOUT_MS);
  50        if (t == 0) {
  51                dev_err(&whc->umc->dev, "generic command timeout (%04x/%04x)\n",
  52                        le_readl(whc->base + WUSBGENCMDSTS),
  53                        le_readl(whc->base + WUSBGENCMDPARAMS));
  54                ret = -ETIMEDOUT;
  55                goto out;
  56        }
  57
  58        if (addr) {
  59                memcpy(whc->gen_cmd_buf, addr, len);
  60                dma_addr = whc->gen_cmd_buf_dma;
  61        } else
  62                dma_addr = 0;
  63
  64        /* Poke registers to start cmd. */
  65        spin_lock_irqsave(&whc->lock, flags);
  66
  67        le_writel(params, whc->base + WUSBGENCMDPARAMS);
  68        le_writeq(dma_addr, whc->base + WUSBGENADDR);
  69
  70        le_writel(WUSBGENCMDSTS_ACTIVE | WUSBGENCMDSTS_IOC | cmd,
  71                  whc->base + WUSBGENCMDSTS);
  72
  73        spin_unlock_irqrestore(&whc->lock, flags);
  74out:
  75        mutex_unlock(&whc->mutex);
  76
  77        return ret;
  78}
  79
  80/**
  81 * whc_hw_error - recover from a hardware error
  82 * @whc:    the WHCI HC that broke.
  83 * @reason: a description of the failure.
  84 *
  85 * Recover from broken hardware with a full reset.
  86 */
  87void whc_hw_error(struct whc *whc, const char *reason)
  88{
  89        struct wusbhc *wusbhc = &whc->wusbhc;
  90
  91        dev_err(&whc->umc->dev, "hardware error: %s\n", reason);
  92        wusbhc_reset_all(wusbhc);
  93}
  94