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