ar5210_interrupts.c revision 185377 
1/*
2 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
3 * Copyright (c) 2002-2004 Atheros Communications, Inc.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 *
17 * $Id: ar5210_interrupts.c,v 1.4 2008/11/10 04:08:02 sam Exp $
18 */
19#include "opt_ah.h"
20
21#ifdef AH_SUPPORT_AR5210
22
23#include "ah.h"
24#include "ah_internal.h"
25
26#include "ar5210/ar5210.h"
27#include "ar5210/ar5210reg.h"
28
29/*
30 * Return non-zero if an interrupt is pending.
31 */
32HAL_BOOL
33ar5210IsInterruptPending(struct ath_hal *ah)
34{
35	return (OS_REG_READ(ah, AR_INTPEND) ? AH_TRUE : AH_FALSE);
36}
37
38/*
39 * Read the Interrupt Status Register value and return
40 * an abstracted bitmask of the data found in the ISR.
41 * Note that reading the ISR clear pending interrupts.
42 */
43HAL_BOOL
44ar5210GetPendingInterrupts(struct ath_hal *ah, HAL_INT *masked)
45{
46#define	AR_FATAL_INT \
47    (AR_ISR_MCABT_INT | AR_ISR_SSERR_INT | AR_ISR_DPERR_INT | AR_ISR_RXORN_INT)
48	struct ath_hal_5210 *ahp = AH5210(ah);
49	uint32_t isr;
50
51	isr = OS_REG_READ(ah, AR_ISR);
52	if (isr == 0xffffffff) {
53		*masked = 0;
54		return AH_FALSE;
55	}
56
57	/*
58	 * Mask interrupts that have no device-independent
59	 * representation; these are added back below.  We
60	 * also masked with the abstracted IMR to insure no
61	 * status bits leak through that weren't requested
62	 * (e.g. RXNOFRM) and that might confuse the caller.
63	 */
64	*masked = (isr & HAL_INT_COMMON) & ahp->ah_maskReg;
65
66	if (isr & AR_FATAL_INT)
67		*masked |= HAL_INT_FATAL;
68	if (isr & (AR_ISR_RXOK_INT | AR_ISR_RXERR_INT))
69		*masked |= HAL_INT_RX;
70	if (isr & (AR_ISR_TXOK_INT | AR_ISR_TXDESC_INT | AR_ISR_TXERR_INT | AR_ISR_TXEOL_INT))
71		*masked |= HAL_INT_TX;
72
73	/*
74	 * On fatal errors collect ISR state for debugging.
75	 */
76	if (*masked & HAL_INT_FATAL) {
77		AH_PRIVATE(ah)->ah_fatalState[0] = isr;
78	}
79
80	return AH_TRUE;
81#undef AR_FATAL_INT
82}
83
84HAL_INT
85ar5210GetInterrupts(struct ath_hal *ah)
86{
87	return AH5210(ah)->ah_maskReg;
88}
89
90HAL_INT
91ar5210SetInterrupts(struct ath_hal *ah, HAL_INT ints)
92{
93	struct ath_hal_5210 *ahp = AH5210(ah);
94	uint32_t omask = ahp->ah_maskReg;
95	uint32_t mask;
96
97	HALDEBUG(ah, HAL_DEBUG_INTERRUPT, "%s: 0x%x => 0x%x\n",
98	    __func__, omask, ints);
99
100	/*
101	 * Disable interrupts here before reading & modifying
102	 * the mask so that the ISR does not modify the mask
103	 * out from under us.
104	 */
105	if (omask & HAL_INT_GLOBAL) {
106		HALDEBUG(ah, HAL_DEBUG_INTERRUPT, "%s: disable IER\n", __func__);
107		OS_REG_WRITE(ah, AR_IER, AR_IER_DISABLE);
108	}
109
110	mask = ints & HAL_INT_COMMON;
111	if (ints & HAL_INT_RX)
112		mask |= AR_IMR_RXOK_INT | AR_IMR_RXERR_INT;
113	if (ints & HAL_INT_TX) {
114		if (ahp->ah_txOkInterruptMask)
115			mask |= AR_IMR_TXOK_INT;
116		if (ahp->ah_txErrInterruptMask)
117			mask |= AR_IMR_TXERR_INT;
118		if (ahp->ah_txDescInterruptMask)
119			mask |= AR_IMR_TXDESC_INT;
120		if (ahp->ah_txEolInterruptMask)
121			mask |= AR_IMR_TXEOL_INT;
122	}
123
124	/* Write the new IMR and store off our SW copy. */
125	HALDEBUG(ah, HAL_DEBUG_INTERRUPT, "%s: new IMR 0x%x\n", __func__, mask);
126	OS_REG_WRITE(ah, AR_IMR, mask);
127	ahp->ah_maskReg = ints;
128
129	/* Re-enable interrupts as appropriate. */
130	if (ints & HAL_INT_GLOBAL) {
131		HALDEBUG(ah, HAL_DEBUG_INTERRUPT, "%s: enable IER\n", __func__);
132		OS_REG_WRITE(ah, AR_IER, AR_IER_ENABLE);
133	}
134
135	return omask;
136}
137#endif /* AH_SUPPORT_AR5210 */
138