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sys/arm/ralink/rt1310_gpio.c

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/*-
* Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.org>
* Copyright (c) 2015 Hiroki Mori
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
* GPIO on RT1310A consist of 2 ports:
* - PortA with 8 input/output pins
* - PortB with 4 input/output pins
*
* Pins are mapped to logical pin number as follows:
* [0..7] -> GPI_00..GPI_07 (port A)
* [8..11] -> GPI_08..GPI_11 (port B)
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <sys/time.h>
#include <sys/timetc.h>
#include <sys/watchdog.h>
#include <sys/gpio.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/resource.h>
#include <machine/intr.h>
#include <machine/fdt.h>
#include <dev/gpio/gpiobusvar.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/ralink/rt1310reg.h>
#include <arm/ralink/rt1310var.h>
#include "gpio_if.h"
struct rt1310_gpio_softc
{
device_t lg_dev;
device_t lg_busdev;
struct resource * lg_res;
bus_space_tag_t lg_bst;
bus_space_handle_t lg_bsh;
};
struct rt1310_gpio_pinmap
{
int lp_start_idx;
int lp_pin_count;
int lp_port;
int lp_start_bit;
int lp_flags;
};
static const struct rt1310_gpio_pinmap rt1310_gpio_pins[] = {
{ 0, 8, RT_GPIO_PORTA, 0, GPIO_PIN_INPUT | GPIO_PIN_OUTPUT },
{ 8, 4, RT_GPIO_PORTB, 0, GPIO_PIN_INPUT | GPIO_PIN_OUTPUT },
{ -1, -1, -1, -1, -1 },
};
#define RT_GPIO_NPINS 12
#define RT_GPIO_PIN_IDX(_map, _idx) \
(_idx - _map->lp_start_idx)
#define RT_GPIO_PIN_BIT(_map, _idx) \
(_map->lp_start_bit + RT_GPIO_PIN_IDX(_map, _idx))
static int rt1310_gpio_probe(device_t);
static int rt1310_gpio_attach(device_t);
static int rt1310_gpio_detach(device_t);
static device_t rt1310_gpio_get_bus(device_t);
static int rt1310_gpio_pin_max(device_t, int *);
static int rt1310_gpio_pin_getcaps(device_t, uint32_t, uint32_t *);
static int rt1310_gpio_pin_getflags(device_t, uint32_t, uint32_t *);
static int rt1310_gpio_pin_setflags(device_t, uint32_t, uint32_t);
static int rt1310_gpio_pin_getname(device_t, uint32_t, char *);
static int rt1310_gpio_pin_get(device_t, uint32_t, uint32_t *);
static int rt1310_gpio_pin_set(device_t, uint32_t, uint32_t);
static int rt1310_gpio_pin_toggle(device_t, uint32_t);
static const struct rt1310_gpio_pinmap *rt1310_gpio_get_pinmap(int);
static struct rt1310_gpio_softc *rt1310_gpio_sc = NULL;
#define rt1310_gpio_read_4(_sc, _reg) \
bus_space_read_4(_sc->lg_bst, _sc->lg_bsh, _reg)
#define rt1310_gpio_write_4(_sc, _reg, _val) \
bus_space_write_4(_sc->lg_bst, _sc->lg_bsh, _reg, _val)
static int
rt1310_gpio_probe(device_t dev)
{
phandle_t node;
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "ralink,rt1310-gpio"))
return (ENXIO);
node = ofw_bus_get_node(dev);
if (!OF_hasprop(node, "gpio-controller"))
return (ENXIO);
device_set_desc(dev, "RT1310 GPIO");
return (BUS_PROBE_DEFAULT);
}
static int
rt1310_gpio_attach(device_t dev)
{
struct rt1310_gpio_softc *sc = device_get_softc(dev);
int rid;
sc->lg_dev = dev;
rid = 0;
sc->lg_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (!sc->lg_res) {
device_printf(dev, "cannot allocate memory window\n");
return (ENXIO);
}
sc->lg_bst = rman_get_bustag(sc->lg_res);
sc->lg_bsh = rman_get_bushandle(sc->lg_res);
rt1310_gpio_sc = sc;
sc->lg_busdev = gpiobus_attach_bus(dev);
if (sc->lg_busdev == NULL) {
bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->lg_res);
return (ENXIO);
}
return (0);
}
static int
rt1310_gpio_detach(device_t dev)
{
return (EBUSY);
}
static device_t
rt1310_gpio_get_bus(device_t dev)
{
struct rt1310_gpio_softc *sc;
sc = device_get_softc(dev);
return (sc->lg_busdev);
}
static int
rt1310_gpio_pin_max(device_t dev, int *npins)
{
*npins = RT_GPIO_NPINS - 1;
return (0);
}
static int
rt1310_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
{
const struct rt1310_gpio_pinmap *map;
if (pin > RT_GPIO_NPINS)
return (ENODEV);
map = rt1310_gpio_get_pinmap(pin);
*caps = map->lp_flags;
return (0);
}
static int
rt1310_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
{
struct rt1310_gpio_softc *sc = device_get_softc(dev);
const struct rt1310_gpio_pinmap *map;
uint32_t state;
int dir;
if (pin > RT_GPIO_NPINS)
return (ENODEV);
map = rt1310_gpio_get_pinmap(pin);
/* Check whether it's bidirectional pin */
if ((map->lp_flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) !=
(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) {
*flags = map->lp_flags;
return (0);
}
switch (map->lp_port) {
case RT_GPIO_PORTA:
state = rt1310_gpio_read_4(sc, RT_GPIO_OFF_PADIR);
dir = (state & (1 << RT_GPIO_PIN_BIT(map, pin)));
break;
case RT_GPIO_PORTB:
state = rt1310_gpio_read_4(sc, RT_GPIO_OFF_PBDIR);
dir = (state & (1 << RT_GPIO_PIN_BIT(map, pin)));
break;
default:
panic("unknown GPIO port");
}
*flags = dir ? GPIO_PIN_OUTPUT : GPIO_PIN_INPUT;
return (0);
}
static int
rt1310_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
{
struct rt1310_gpio_softc *sc = device_get_softc(dev);
const struct rt1310_gpio_pinmap *map;
uint32_t dir, state;
uint32_t port;
if (pin > RT_GPIO_NPINS)
return (ENODEV);
map = rt1310_gpio_get_pinmap(pin);
/* Check whether it's bidirectional pin */
if ((map->lp_flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) !=
(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT))
return (ENOTSUP);
if (flags & GPIO_PIN_INPUT)
dir = 0;
if (flags & GPIO_PIN_OUTPUT)
dir = 1;
switch (map->lp_port) {
case RT_GPIO_PORTA:
port = RT_GPIO_OFF_PADIR;
break;
case RT_GPIO_PORTB:
port = RT_GPIO_OFF_PBDIR;
break;
}
state = rt1310_gpio_read_4(sc, port);
if (flags & GPIO_PIN_INPUT) {
state &= ~(1 << RT_GPIO_PIN_IDX(map, pin));
} else {
state |= (1 << RT_GPIO_PIN_IDX(map, pin));
}
rt1310_gpio_write_4(sc, port, state);
return (0);
}
static int
rt1310_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
{
snprintf(name, GPIOMAXNAME - 1, "GPIO_%02d", pin);
return (0);
}
static int
rt1310_gpio_pin_get(device_t dev, uint32_t pin, uint32_t *value)
{
struct rt1310_gpio_softc *sc = device_get_softc(dev);
const struct rt1310_gpio_pinmap *map;
uint32_t state, flags;
int dir;
map = rt1310_gpio_get_pinmap(pin);
if (rt1310_gpio_pin_getflags(dev, pin, &flags))
return (ENXIO);
if (flags & GPIO_PIN_OUTPUT)
dir = 1;
if (flags & GPIO_PIN_INPUT)
dir = 0;
switch (map->lp_port) {
case RT_GPIO_PORTA:
state = rt1310_gpio_read_4(sc, RT_GPIO_OFF_PADR);
*value = !!(state & (1 << RT_GPIO_PIN_BIT(map, pin)));
break;
case RT_GPIO_PORTB:
state = rt1310_gpio_read_4(sc, RT_GPIO_OFF_PBDR);
*value = !!(state & (1 << RT_GPIO_PIN_BIT(map, pin)));
break;
}
return (0);
}
static int
rt1310_gpio_pin_set(device_t dev, uint32_t pin, uint32_t value)
{
struct rt1310_gpio_softc *sc = device_get_softc(dev);
const struct rt1310_gpio_pinmap *map;
uint32_t state, flags;
uint32_t port;
map = rt1310_gpio_get_pinmap(pin);
if (rt1310_gpio_pin_getflags(dev, pin, &flags))
return (ENXIO);
if ((flags & GPIO_PIN_OUTPUT) == 0)
return (EINVAL);
switch (map->lp_port) {
case RT_GPIO_PORTA:
port = RT_GPIO_OFF_PADR;
break;
case RT_GPIO_PORTB:
port = RT_GPIO_OFF_PBDR;
break;
}
state = rt1310_gpio_read_4(sc, port);
if (value == 1) {
state |= (1 << RT_GPIO_PIN_BIT(map, pin));
} else {
state &= ~(1 << RT_GPIO_PIN_BIT(map, pin));
}
rt1310_gpio_write_4(sc, port, state);
return (0);
}
static int
rt1310_gpio_pin_toggle(device_t dev, uint32_t pin)
{
const struct rt1310_gpio_pinmap *map;
uint32_t flags;
map = rt1310_gpio_get_pinmap(pin);
if (rt1310_gpio_pin_getflags(dev, pin, &flags))
return (ENXIO);
if ((flags & GPIO_PIN_OUTPUT) == 0)
return (EINVAL);
panic("not implemented yet");
return (0);
}
static const struct rt1310_gpio_pinmap *
rt1310_gpio_get_pinmap(int pin)
{
const struct rt1310_gpio_pinmap *map;
for (map = &rt1310_gpio_pins[0]; map->lp_start_idx != -1; map++) {
if (pin >= map->lp_start_idx &&
pin < map->lp_start_idx + map->lp_pin_count)
return map;
}
panic("pin number %d out of range", pin);
}
int
rt1310_gpio_set_flags(device_t dev, int pin, int flags)
{
if (rt1310_gpio_sc == NULL)
return (ENXIO);
return rt1310_gpio_pin_setflags(rt1310_gpio_sc->lg_dev, pin, flags);
}
int
rt1310_gpio_set_state(device_t dev, int pin, int state)
{
if (rt1310_gpio_sc == NULL)
return (ENXIO);
return rt1310_gpio_pin_set(rt1310_gpio_sc->lg_dev, pin, state);
}
int
rt1310_gpio_get_state(device_t dev, int pin, int *state)
{
if (rt1310_gpio_sc == NULL)
return (ENXIO);
return rt1310_gpio_pin_get(rt1310_gpio_sc->lg_dev, pin, state);
}
static phandle_t
rt1310_gpio_get_node(device_t bus, device_t dev)
{
/* We only have one child, the GPIO bus, which needs our own node. */
return (ofw_bus_get_node(bus));
}
static device_method_t rt1310_gpio_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, rt1310_gpio_probe),
DEVMETHOD(device_attach, rt1310_gpio_attach),
DEVMETHOD(device_detach, rt1310_gpio_detach),
/* GPIO interface */
DEVMETHOD(gpio_get_bus, rt1310_gpio_get_bus),
DEVMETHOD(gpio_pin_max, rt1310_gpio_pin_max),
DEVMETHOD(gpio_pin_getcaps, rt1310_gpio_pin_getcaps),
DEVMETHOD(gpio_pin_getflags, rt1310_gpio_pin_getflags),
DEVMETHOD(gpio_pin_setflags, rt1310_gpio_pin_setflags),
DEVMETHOD(gpio_pin_getname, rt1310_gpio_pin_getname),
DEVMETHOD(gpio_pin_set, rt1310_gpio_pin_set),
DEVMETHOD(gpio_pin_get, rt1310_gpio_pin_get),
DEVMETHOD(gpio_pin_toggle, rt1310_gpio_pin_toggle),
/* ofw_bus interface */
DEVMETHOD(ofw_bus_get_node, rt1310_gpio_get_node),
{ 0, 0 }
};
static devclass_t rt1310_gpio_devclass;
static driver_t rt1310_gpio_driver = {
"gpio",
rt1310_gpio_methods,
sizeof(struct rt1310_gpio_softc),
};
DRIVER_MODULE(rt1310gpio, simplebus, rt1310_gpio_driver, rt1310_gpio_devclass, 0, 0);
MODULE_VERSION(rt1310gpio, 1);