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}