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
  15 void 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  */
  37 int 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);
  74 out:
  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  */
  87 void 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 }