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
26 void 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 */
48 int 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);
85 out:
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 */
98 void 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
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