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

   1/*
   2 * Wireless Host Controller (WHC) hardware access helpers.
   3 *
   4 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License version
   8 * 2 as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18#include <linux/kernel.h>
  19#include <linux/dma-mapping.h>
  20#include <linux/uwb/umc.h>
  21
  22#include "../../wusbcore/wusbhc.h"
  23
  24#include "whcd.h"
  25
  26void whc_write_wusbcmd(struct whc *whc, u32 mask, u32 val)
  27{
  28        unsigned long flags;
  29        u32 cmd;
  30
  31        spin_lock_irqsave(&whc->lock, flags);
  32
  33        cmd = le_readl(whc->base + WUSBCMD);
  34        cmd = (cmd & ~mask) | val;
  35        le_writel(cmd, whc->base + WUSBCMD);
  36
  37        spin_unlock_irqrestore(&whc->lock, flags);
  38}
  39
  40/**
  41 * whc_do_gencmd - start a generic command via the WUSBGENCMDSTS register
  42 * @whc:    the WHCI HC
  43 * @cmd:    command to start.
  44 * @params: parameters for the command (the WUSBGENCMDPARAMS register value).
  45 * @addr:   pointer to any data for the command (may be NULL).
  46 * @len:    length of the data (if any).
  47 */
  48int whc_do_gencmd(struct whc *whc, u32 cmd, u32 params, void *addr, size_t len)
  49{
  50        unsigned long flags;
  51        dma_addr_t dma_addr;
  52        int t;
  53        int ret = 0;
  54
  55        mutex_lock(&whc->mutex);
  56
  57        /* Wait for previous command to complete. */
  58        t = wait_event_timeout(whc->cmd_wq,
  59                               (le_readl(whc->base + WUSBGENCMDSTS) & WUSBGENCMDSTS_ACTIVE) == 0,
  60                               WHC_GENCMD_TIMEOUT_MS);
  61        if (t == 0) {
  62                dev_err(&whc->umc->dev, "generic command timeout (%04x/%04x)\n",
  63                        le_readl(whc->base + WUSBGENCMDSTS),
  64                        le_readl(whc->base + WUSBGENCMDPARAMS));
  65                ret = -ETIMEDOUT;
  66                goto out;
  67        }
  68
  69        if (addr) {
  70                memcpy(whc->gen_cmd_buf, addr, len);
  71                dma_addr = whc->gen_cmd_buf_dma;
  72        } else
  73                dma_addr = 0;
  74
  75        /* Poke registers to start cmd. */
  76        spin_lock_irqsave(&whc->lock, flags);
  77
  78        le_writel(params, whc->base + WUSBGENCMDPARAMS);
  79        le_writeq(dma_addr, whc->base + WUSBGENADDR);
  80
  81        le_writel(WUSBGENCMDSTS_ACTIVE | WUSBGENCMDSTS_IOC | cmd,
  82                  whc->base + WUSBGENCMDSTS);
  83
  84        spin_unlock_irqrestore(&whc->lock, flags);
  85out:
  86        mutex_unlock(&whc->mutex);
  87
  88        return ret;
  89}
  90
  91/**
  92 * whc_hw_error - recover from a hardware error
  93 * @whc:    the WHCI HC that broke.
  94 * @reason: a description of the failure.
  95 *
  96 * Recover from broken hardware with a full reset.
  97 */
  98void whc_hw_error(struct whc *whc, const char *reason)
  99{
 100        struct wusbhc *wusbhc = &whc->wusbhc;
 101
 102        dev_err(&whc->umc->dev, "hardware error: %s\n", reason);
 103        wusbhc_reset_all(wusbhc);
 104}
 105