1 /*
2  * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
3  * Copyright (c) 2002-2008 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: ar5416_gpio.c,v 1.1.1.1 2008/12/11 04:46:48 alc Exp $
18  */
19 #include "opt_ah.h"
20 
21 #include "ah.h"
22 #include "ah_internal.h"
23 #include "ah_devid.h"
24 #ifdef AH_DEBUG
25 #include "ah_desc.h"			/* NB: for HAL_PHYERR* */
26 #endif
27 
28 #include "ar5416/ar5416.h"
29 #include "ar5416/ar5416reg.h"
30 #include "ar5416/ar5416phy.h"
31 
32 #define	AR_NUM_GPIO	6		/* 6 GPIO pins */
33 #define AR_GPIO_BIT(_gpio)	(1 << _gpio)
34 
35 /*
36  * Configure GPIO Output lines
37  */
38 HAL_BOOL
39 ar5416GpioCfgOutput(struct ath_hal *ah, uint32_t gpio)
40 {
41 	HALASSERT(gpio < AR_NUM_GPIO);
42 	OS_REG_CLR_BIT(ah, AR_GPIO_INTR_OUT, AR_GPIO_BIT(gpio));
43 	return AH_TRUE;
44 }
45 
46 /*
47  * Configure GPIO Input lines
48  */
49 HAL_BOOL
50 ar5416GpioCfgInput(struct ath_hal *ah, uint32_t gpio)
51 {
52 	HALASSERT(gpio < AR_NUM_GPIO);
53 	OS_REG_SET_BIT(ah, AR_GPIO_INTR_OUT, AR_GPIO_BIT(gpio));
54 	return AH_TRUE;
55 }
56 
57 /*
58  * Once configured for I/O - set output lines
59  */
60 HAL_BOOL
61 ar5416GpioSet(struct ath_hal *ah, uint32_t gpio, uint32_t val)
62 {
63 	uint32_t reg;
64 
65 	HALASSERT(gpio < AR_NUM_GPIO);
66 	reg = MS(OS_REG_READ(ah, AR_GPIO_INTR_OUT), AR_GPIO_OUT_VAL);
67 	if (val & 1)
68 		reg |= AR_GPIO_BIT(gpio);
69 	else
70 		reg &= ~AR_GPIO_BIT(gpio);
71 
72 	OS_REG_RMW_FIELD(ah, AR_GPIO_INTR_OUT, AR_GPIO_OUT_VAL, reg);
73 	return AH_TRUE;
74 }
75 
76 /*
77  * Once configured for I/O - get input lines
78  */
79 uint32_t
80 ar5416GpioGet(struct ath_hal *ah, uint32_t gpio)
81 {
82 	if (gpio >= AR_NUM_GPIO)
83 		return 0xffffffff;
84 	return ((OS_REG_READ(ah, AR_GPIO_IN) & AR_GPIO_BIT(gpio)) >> gpio);
85 }
86 
87 /*
88  * Set the GPIO Interrupt
89  */
90 void
91 ar5416GpioSetIntr(struct ath_hal *ah, u_int gpio, uint32_t ilevel)
92 {
93 	uint32_t val;
94 
95 	HALASSERT(gpio < AR_NUM_GPIO);
96 	/* XXX bounds check gpio */
97 	val = MS(OS_REG_READ(ah, AR_GPIO_INTR_OUT), AR_GPIO_INTR_CTRL);
98 	if (ilevel)		/* 0 == interrupt on pin high */
99 		val &= ~AR_GPIO_BIT(gpio);
100 	else			/* 1 == interrupt on pin low */
101 		val |= AR_GPIO_BIT(gpio);
102 	OS_REG_RMW_FIELD(ah, AR_GPIO_INTR_OUT, AR_GPIO_INTR_CTRL, val);
103 
104 	/* Change the interrupt mask. */
105 	val = MS(OS_REG_READ(ah, AR_INTR_ASYNC_ENABLE), AR_INTR_GPIO);
106 	val |= AR_GPIO_BIT(gpio);
107 	OS_REG_RMW_FIELD(ah, AR_INTR_ASYNC_ENABLE, AR_INTR_GPIO, val);
108 
109 	val = MS(OS_REG_READ(ah, AR_INTR_ASYNC_MASK), AR_INTR_GPIO);
110 	val |= AR_GPIO_BIT(gpio);
111 	OS_REG_RMW_FIELD(ah, AR_INTR_ASYNC_MASK, AR_INTR_GPIO, val);
112 }
113