1 // SPDX-License-Identifier: GPL-2.0
3 * Wireless Host Controller (WHC) hardware access helpers.
5 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
7 #include <linux/kernel.h>
8 #include <linux/dma-mapping.h>
9 #include <linux/uwb/umc.h>
11 #include "../../wusbcore/wusbhc.h"
15 void whc_write_wusbcmd(struct whc *whc, u32 mask, u32 val)
20 spin_lock_irqsave(&whc->lock, flags);
22 cmd = le_readl(whc->base + WUSBCMD);
23 cmd = (cmd & ~mask) | val;
24 le_writel(cmd, whc->base + WUSBCMD);
26 spin_unlock_irqrestore(&whc->lock, flags);
30 * whc_do_gencmd - start a generic command via the WUSBGENCMDSTS register
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).
37 int whc_do_gencmd(struct whc *whc, u32 cmd, u32 params, void *addr, size_t len)
44 mutex_lock(&whc->mutex);
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);
51 dev_err(&whc->umc->dev, "generic command timeout (%04x/%04x)\n",
52 le_readl(whc->base + WUSBGENCMDSTS),
53 le_readl(whc->base + WUSBGENCMDPARAMS));
59 memcpy(whc->gen_cmd_buf, addr, len);
60 dma_addr = whc->gen_cmd_buf_dma;
64 /* Poke registers to start cmd. */
65 spin_lock_irqsave(&whc->lock, flags);
67 le_writel(params, whc->base + WUSBGENCMDPARAMS);
68 le_writeq(dma_addr, whc->base + WUSBGENADDR);
70 le_writel(WUSBGENCMDSTS_ACTIVE | WUSBGENCMDSTS_IOC | cmd,
71 whc->base + WUSBGENCMDSTS);
73 spin_unlock_irqrestore(&whc->lock, flags);
75 mutex_unlock(&whc->mutex);
81 * whc_hw_error - recover from a hardware error
82 * @whc: the WHCI HC that broke.
83 * @reason: a description of the failure.
85 * Recover from broken hardware with a full reset.
87 void whc_hw_error(struct whc *whc, const char *reason)
89 struct wusbhc *wusbhc = &whc->wusbhc;
91 dev_err(&whc->umc->dev, "hardware error: %s\n", reason);
92 wusbhc_reset_all(wusbhc);