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