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      1 /* $NetBSD: argpio.c,v 1.10 2021/08/07 16:18:58 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2006 Garrett D'Amore
      5  * All rights reserved.
      6  *
      7  * Written by Garrett D'Amore.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. The name of the author may not be used to endorse
     18  *    or promote products derived from this software without specific
     19  *    prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     22  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     23  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     25  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
     27  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     29  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     30  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     31  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: argpio.c,v 1.10 2021/08/07 16:18:58 thorpej Exp $");
     36 
     37 #include <sys/param.h>
     38 #include <sys/bus.h>
     39 #include <sys/conf.h>
     40 #include <sys/device.h>
     41 #include <sys/gpio.h>
     42 #include <sys/intr.h>
     43 #include <sys/kernel.h>
     44 #include <sys/types.h>
     45 
     46 #include <mips/atheros/include/arbusvar.h>
     47 
     48 #include <dev/gpio/gpiovar.h>
     49 #include <dev/sysmon/sysmonvar.h>
     50 #include <dev/sysmon/sysmon_taskq.h>
     51 
     52 #include <mips/atheros/dev/argpioreg.h>
     53 
     54 /*
     55  * General Plan:
     56  *
     57  * Register GPIOs for all pins that are _not_ associated with the reset
     58  * pin.  (Possibly also not the system LED.)
     59  */
     60 
     61 struct argpio_softc {
     62 	device_t		sc_dev;
     63 	struct gpio_chipset_tag	sc_gc;
     64 	gpio_pin_t		sc_pins[ARGPIO_NPINS];
     65 	int			sc_npins;
     66 	bus_space_tag_t		sc_st;
     67 	bus_space_handle_t	sc_sh;
     68 	bus_size_t		sc_size;
     69 	int			sc_caps;
     70 	struct sysmon_pswitch	sc_resetbtn;
     71 	void			*sc_ih;
     72 	int			sc_rstpin;
     73 	int			sc_ledpin;
     74 };
     75 
     76 static int argpio_match(device_t, cfdata_t, void *);
     77 static void argpio_attach(device_t, device_t, void *);
     78 static int argpio_intr(void *);
     79 static void argpio_reset_pressed(void *);
     80 static void argpio_ctl(void *, int, int);
     81 static void argpio_write(void *, int, int);
     82 static int argpio_read(void *, int);
     83 
     84 CFATTACH_DECL_NEW(argpio, sizeof (struct argpio_softc), argpio_match,
     85     argpio_attach, NULL, NULL);
     86 
     87 #define	INPUT(pin)	(1 << (pin))		/* input bit */
     88 #define	INTR(pin)	(1 << ((pin) + 8))	/* interrupt bit */
     89 #define	SERIAL(pin)	(1 << ((pin) + 16))	/* serial mux bit */
     90 
     91 #define	GETREG(sc, o)		bus_space_read_4(sc->sc_st, sc->sc_sh, o)
     92 #define	PUTREG(sc, o, v)	bus_space_write_4(sc->sc_st, sc->sc_sh, o, v)
     93 #define	FLUSH(sc)		bus_space_barrier(sc->sc_st, sc->sc_sh, \
     94 				0, 12, BUS_SPACE_BARRIER_READ|BUS_SPACE_BARRIER_WRITE)
     95 
     96 int
     97 argpio_match(device_t parent, cfdata_t match, void *aux)
     98 {
     99 	struct arbus_attach_args *aa = aux;
    100 
    101 	return ((strcmp(aa->aa_name, "argpio") == 0) ? 1 : 0);
    102 }
    103 
    104 void
    105 argpio_attach(device_t parent, device_t self, void *aux)
    106 {
    107 	struct argpio_softc *sc = device_private(self);
    108 	struct arbus_attach_args *aa = aux;
    109 	struct gpiobus_attach_args gba;
    110 	prop_number_t	pn;
    111 	int i;
    112 	uint32_t reg;
    113 
    114 	sc->sc_dev = self;
    115 	sc->sc_st = aa->aa_bst;
    116 	sc->sc_npins = ARGPIO_NPINS;
    117 	sc->sc_size = aa->aa_size;
    118 	sc->sc_ledpin = -1;
    119 	sc->sc_rstpin = -1;
    120 
    121 	if (bus_space_map(sc->sc_st, aa->aa_addr, sc->sc_size, 0,
    122 		&sc->sc_sh) != 0) {
    123 		printf(": unable to map registers!\n");
    124 		return;
    125 	}
    126 
    127 	sc->sc_gc.gp_cookie = sc;
    128 	sc->sc_gc.gp_pin_read = argpio_read;
    129 	sc->sc_gc.gp_pin_write = argpio_write;
    130 	sc->sc_gc.gp_pin_ctl = argpio_ctl;
    131 
    132 	aprint_normal(": Atheros AR531X GPIO");
    133 	pn = prop_dictionary_get(device_properties(sc->sc_dev), "reset-pin");
    134 	if (pn != NULL) {
    135 		KASSERT(prop_object_type(pn) == PROP_TYPE_NUMBER);
    136 		sc->sc_rstpin = (int)prop_number_integer_value(pn);
    137 		aprint_normal(", reset button pin %d", sc->sc_rstpin);
    138 	}
    139 	pn = prop_dictionary_get(device_properties(sc->sc_dev), "sysled-pin");
    140 	if (pn != NULL) {
    141 		KASSERT(prop_object_type(pn) == PROP_TYPE_NUMBER);
    142 		sc->sc_ledpin = (int)prop_number_integer_value(pn);
    143 		aprint_normal(", system led pin %d", sc->sc_ledpin);
    144 	}
    145 
    146 	aprint_normal("\n");
    147 
    148 	if (sc->sc_ledpin) {
    149 		sc->sc_ih = arbus_intr_establish(aa->aa_cirq, aa->aa_mirq,
    150 		    argpio_intr, sc);
    151 		if (sc->sc_ih == NULL) {
    152 			aprint_error_dev(sc->sc_dev,
    153 			    "couldn't establish interrupt\n");
    154 		}
    155 	}
    156 
    157 	if (sc->sc_ih) {
    158 		sysmon_task_queue_init();
    159 
    160 		sc->sc_resetbtn.smpsw_name = device_xname(sc->sc_dev);
    161 		sc->sc_resetbtn.smpsw_type = PSWITCH_TYPE_RESET;
    162 		if (sysmon_pswitch_register(&sc->sc_resetbtn) != 0) {
    163 			aprint_normal_dev(sc->sc_dev,
    164 			    "unable to register reset button\n");
    165 		}
    166 	}
    167 
    168 	reg = GETREG(sc, GPIO_CR);
    169 
    170 	for (i = 0; i < sc->sc_npins; i++) {
    171 		gpio_pin_t	*pp;
    172 
    173 		pp = &sc->sc_pins[i];
    174 
    175 		if (i == sc->sc_rstpin) {
    176 			/* configure as interrupt for reset */
    177 			pp->pin_caps = GPIO_PIN_INPUT;
    178 			reg &= ~SERIAL(i);
    179 			reg |= INPUT(i);
    180 			/* only if we were able to set up the handler, tho' */
    181 			if (sc->sc_ih != NULL)
    182 				reg |= INTR(i);
    183 
    184 		} else if (i == sc->sc_ledpin) {
    185 			/* configure as output for LED */
    186 			pp->pin_caps = GPIO_PIN_OUTPUT;
    187 			reg &= ~SERIAL(i);
    188 			reg &= ~INPUT(i);
    189 			reg &= ~INTR(i);
    190 
    191 		} else {
    192 			if (reg & SERIAL(i)) {
    193 				/* pin multiplexed with serial bit */
    194 				pp->pin_caps = 0;
    195 			} else {
    196 				pp->pin_caps = GPIO_PIN_INPUT |
    197 				    GPIO_PIN_OUTPUT;
    198 			}
    199 		}
    200 	}
    201 
    202 	PUTREG(sc, GPIO_CR, reg);
    203 	FLUSH(sc);
    204 
    205 	gba.gba_gc = &sc->sc_gc;
    206 	gba.gba_pins = sc->sc_pins;
    207 	gba.gba_npins = sc->sc_npins;
    208 	config_found(sc->sc_dev, &gba, gpiobus_print, CFARGS_NONE);
    209 }
    210 
    211 void
    212 argpio_ctl(void *arg, int pin, int flags)
    213 {
    214 	struct argpio_softc	*sc = arg;
    215 	uint32_t		reg;
    216 
    217 	reg = GETREG(sc, GPIO_CR);
    218 	if (reg & (SERIAL(pin) | INTR(pin))) {
    219 		printf("pin %d cannot be changed!\n", pin);
    220 		/* don't allow changes to these bits */
    221 		return;
    222 	}
    223 	if (flags & GPIO_PIN_INPUT) {
    224 		reg |= INPUT(pin);
    225 	} else {
    226 		reg &= ~INPUT(pin);
    227 	}
    228 
    229 	PUTREG(sc, GPIO_CR, reg);
    230 	FLUSH(sc);
    231 }
    232 
    233 void
    234 argpio_write(void *arg, int pin, int value)
    235 {
    236 	struct argpio_softc	*sc = arg;
    237 	uint32_t		reg;
    238 
    239 	reg = GETREG(sc, GPIO_DO);
    240 	if (value)
    241 		reg &= ~(1 << pin);
    242 	else
    243 		reg |= (1 << pin);
    244 	PUTREG(sc, GPIO_DO, reg);
    245 	FLUSH(sc);
    246 }
    247 
    248 int
    249 argpio_read(void *arg, int pin)
    250 {
    251 	struct argpio_softc	*sc = arg;
    252 
    253 	return ((GETREG(sc, GPIO_DI) & (1 << pin)) ?
    254 	    GPIO_PIN_HIGH : GPIO_PIN_LOW);
    255 }
    256 
    257 void
    258 argpio_reset_pressed(void *arg)
    259 {
    260 	struct argpio_softc	*sc = arg;
    261 	int			x;
    262 
    263 	sysmon_pswitch_event(&sc->sc_resetbtn, PSWITCH_EVENT_PRESSED);
    264 
    265 	/* reenable the interrupt */
    266 	x = splhigh();
    267 	PUTREG(sc, GPIO_CR,
    268 	    GETREG(sc, GPIO_CR) | INTR(sc->sc_rstpin));
    269 	splx(x);
    270 }
    271 
    272 int
    273 argpio_intr(void  *arg)
    274 {
    275 	struct argpio_softc	*sc = arg;
    276 
    277 	if (sc->sc_rstpin < 0)
    278 		return 0;
    279 
    280 	/* this is an edge triggered interrupt, so disable it for now */
    281 	PUTREG(sc, GPIO_CR, GETREG(sc, GPIO_CR) & ~INTR(sc->sc_rstpin));
    282 
    283 	/* no other interrupt on this, so we have to claim it */
    284 	sysmon_task_queue_sched(0, argpio_reset_pressed, sc);
    285 
    286 	return 1;
    287 }
    288