2 * Wireless Host Controller (WHC) hardware access helpers.
4 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
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.
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.
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/>.
18 #include <linux/kernel.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/uwb/umc.h>
22 #include "../../wusbcore/wusbhc.h"
26 void whc_write_wusbcmd(struct whc *whc, u32 mask, u32 val)
31 spin_lock_irqsave(&whc->lock, flags);
33 cmd = le_readl(whc->base + WUSBCMD);
34 cmd = (cmd & ~mask) | val;
35 le_writel(cmd, whc->base + WUSBCMD);
37 spin_unlock_irqrestore(&whc->lock, flags);
41 * whc_do_gencmd - start a generic command via the WUSBGENCMDSTS register
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).
48 int whc_do_gencmd(struct whc *whc, u32 cmd, u32 params, void *addr, size_t len)
55 mutex_lock(&whc->mutex);
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);
62 dev_err(&whc->umc->dev, "generic command timeout (%04x/%04x)\n",
63 le_readl(whc->base + WUSBGENCMDSTS),
64 le_readl(whc->base + WUSBGENCMDPARAMS));
70 memcpy(whc->gen_cmd_buf, addr, len);
71 dma_addr = whc->gen_cmd_buf_dma;
75 /* Poke registers to start cmd. */
76 spin_lock_irqsave(&whc->lock, flags);
78 le_writel(params, whc->base + WUSBGENCMDPARAMS);
79 le_writeq(dma_addr, whc->base + WUSBGENADDR);
81 le_writel(WUSBGENCMDSTS_ACTIVE | WUSBGENCMDSTS_IOC | cmd,
82 whc->base + WUSBGENCMDSTS);
84 spin_unlock_irqrestore(&whc->lock, flags);
86 mutex_unlock(&whc->mutex);
92 * whc_hw_error - recover from a hardware error
93 * @whc: the WHCI HC that broke.
94 * @reason: a description of the failure.
96 * Recover from broken hardware with a full reset.
98 void whc_hw_error(struct whc *whc, const char *reason)
100 struct wusbhc *wusbhc = &whc->wusbhc;
102 dev_err(&whc->umc->dev, "hardware error: %s\n", reason);
103 wusbhc_reset_all(wusbhc);