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
whc_write_wusbcmd(struct whc * whc,u32 mask,u32 val)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 */
whc_do_gencmd(struct whc * whc,u32 cmd,u32 params,void * addr,size_t len)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 */
whc_hw_error(struct whc * whc,const char * reason)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 }
94
