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      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: ar5212_gpio.c,v 1.2 2011/03/07 11:25:43 cegger 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 "ar5212/ar5212.h"
     29 #include "ar5212/ar5212reg.h"
     30 #include "ar5212/ar5212phy.h"
     31 
     32 #define	AR_NUM_GPIO	6		/* 6 GPIO pins */
     33 #define	AR_GPIOD_MASK	0x0000002F	/* GPIO data reg r/w mask */
     34 
     35 /*
     36  * Configure GPIO Output lines
     37  */
     38 HAL_BOOL
     39 ar5212GpioCfgOutput(struct ath_hal *ah, uint32_t gpio, HAL_GPIO_MUX_TYPE type)
     40 {
     41 	HALASSERT(gpio < AR_NUM_GPIO);
     42 
     43 	/*
     44 	 * NB: AR_GPIOCR_CR_A(pin) is all 1's so there's no need
     45 	 *     to clear the field before or'ing in the new value.
     46 	 */
     47 	OS_REG_WRITE(ah, AR_GPIOCR,
     48 		  OS_REG_READ(ah, AR_GPIOCR) | AR_GPIOCR_CR_A(gpio));
     49 
     50 	return AH_TRUE;
     51 }
     52 
     53 /*
     54  * Configure GPIO Input lines
     55  */
     56 HAL_BOOL
     57 ar5212GpioCfgInput(struct ath_hal *ah, uint32_t gpio)
     58 {
     59 	HALASSERT(gpio < AR_NUM_GPIO);
     60 
     61 	OS_REG_WRITE(ah, AR_GPIOCR,
     62 		  (OS_REG_READ(ah, AR_GPIOCR) &~ AR_GPIOCR_CR_A(gpio))
     63 		| AR_GPIOCR_CR_N(gpio));
     64 
     65 	return AH_TRUE;
     66 }
     67 
     68 /*
     69  * Once configured for I/O - set output lines
     70  */
     71 HAL_BOOL
     72 ar5212GpioSet(struct ath_hal *ah, uint32_t gpio, uint32_t val)
     73 {
     74 	uint32_t reg;
     75 
     76 	HALASSERT(gpio < AR_NUM_GPIO);
     77 
     78 	reg =  OS_REG_READ(ah, AR_GPIODO);
     79 	reg &= ~(1 << gpio);
     80 	reg |= (val&1) << gpio;
     81 
     82 	OS_REG_WRITE(ah, AR_GPIODO, reg);
     83 	return AH_TRUE;
     84 }
     85 
     86 /*
     87  * Once configured for I/O - get input lines
     88  */
     89 uint32_t
     90 ar5212GpioGet(struct ath_hal *ah, uint32_t gpio)
     91 {
     92 	if (gpio < AR_NUM_GPIO) {
     93 		uint32_t val = OS_REG_READ(ah, AR_GPIODI);
     94 		val = ((val & AR_GPIOD_MASK) >> gpio) & 0x1;
     95 		return val;
     96 	} else  {
     97 		return 0xffffffff;
     98 	}
     99 }
    100 
    101 /*
    102  * Set the GPIO Interrupt
    103  */
    104 void
    105 ar5212GpioSetIntr(struct ath_hal *ah, u_int gpio, uint32_t ilevel)
    106 {
    107 	uint32_t val;
    108 
    109 	/* XXX bounds check gpio */
    110 	val = OS_REG_READ(ah, AR_GPIOCR);
    111 	val &= ~(AR_GPIOCR_CR_A(gpio) |
    112 		 AR_GPIOCR_INT_MASK | AR_GPIOCR_INT_ENA | AR_GPIOCR_INT_SEL);
    113 	val |= AR_GPIOCR_CR_N(gpio) | AR_GPIOCR_INT(gpio) | AR_GPIOCR_INT_ENA;
    114 	if (ilevel)
    115 		val |= AR_GPIOCR_INT_SELH;	/* interrupt on pin high */
    116 	else
    117 		val |= AR_GPIOCR_INT_SELL;	/* interrupt on pin low */
    118 
    119 	/* Don't need to change anything for low level interrupt. */
    120 	OS_REG_WRITE(ah, AR_GPIOCR, val);
    121 
    122 	/* Change the interrupt mask. */
    123 	(void) ar5212SetInterrupts(ah, AH5212(ah)->ah_maskReg | HAL_INT_GPIO);
    124 }
    125