3df058ffaf
This driver allows read the software reset switch state and control the status LEDs. The GPIO pins have their direction (input/output) locked down to prevent possible short circuits. Note that most people get a reset button that is a hardware reset. The software reset button is available on boards from Netgate. Sponsored by: Rubicon Communications (Netgate)
369 lines
8.7 KiB
C
369 lines
8.7 KiB
C
/*-
|
|
* Copyright (c) 2015 Rubicon Communications, LLC (Netgate)
|
|
* 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.
|
|
*/
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* GPIO driver for the ADI Engineering RCC-VE and RCC-DFF/DFFv2.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/gpio.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <sys/rman.h>
|
|
|
|
#include <machine/bus.h>
|
|
|
|
#include <dev/gpio/gpiobusvar.h>
|
|
#include <isa/isavar.h>
|
|
|
|
#include "gpio_if.h"
|
|
|
|
#define RCC_GPIO_BASE 0x500
|
|
#define RCC_GPIO_USE_SEL 0x00
|
|
#define RCC_GPIO_IO_SEL 0x04
|
|
#define RCC_GPIO_GP_LVL 0x08
|
|
|
|
struct rcc_gpio_pin {
|
|
uint32_t pin;
|
|
const char *name;
|
|
uint32_t caps;
|
|
};
|
|
|
|
static struct rcc_gpio_pin rcc_pins[] = {
|
|
{ .pin = 11, .name = "reset switch", .caps = GPIO_PIN_INPUT },
|
|
{ .pin = 15, .name = "red LED", .caps = GPIO_PIN_OUTPUT },
|
|
{ .pin = 17, .name = "green LED", .caps = GPIO_PIN_OUTPUT },
|
|
#if 0
|
|
{ .pin = 16, .name = "HD1 LED", .caps = GPIO_PIN_OUTPUT },
|
|
{ .pin = 18, .name = "HD2 LED", .caps = GPIO_PIN_OUTPUT },
|
|
#endif
|
|
};
|
|
|
|
struct rcc_gpio_softc {
|
|
device_t sc_dev;
|
|
device_t sc_busdev;
|
|
struct mtx sc_mtx;
|
|
struct resource *sc_io_res;
|
|
bus_space_tag_t sc_bst;
|
|
bus_space_handle_t sc_bsh;
|
|
uint32_t sc_output;
|
|
int sc_io_rid;
|
|
int sc_gpio_npins;
|
|
};
|
|
|
|
#define RCC_GPIO_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
|
|
#define RCC_GPIO_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
|
|
#define RCC_WRITE(_sc, _off, _val) \
|
|
bus_space_write_4((_sc)->sc_bst, (_sc)->sc_bsh, _off, _val)
|
|
#define RCC_READ(_sc, _off) \
|
|
bus_space_read_4((_sc)->sc_bst, (_sc)->sc_bsh, _off)
|
|
|
|
static void
|
|
rcc_gpio_modify_bits(struct rcc_gpio_softc *sc, uint32_t reg, uint32_t mask,
|
|
uint32_t bit)
|
|
{
|
|
uint32_t value;
|
|
|
|
RCC_GPIO_LOCK(sc);
|
|
value = RCC_READ(sc, reg);
|
|
value &= ~(1 << mask);
|
|
value |= (1 << bit);
|
|
RCC_WRITE(sc, reg, value);
|
|
RCC_GPIO_UNLOCK(sc);
|
|
}
|
|
|
|
static device_t
|
|
rcc_gpio_get_bus(device_t dev)
|
|
{
|
|
struct rcc_gpio_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
return (sc->sc_busdev);
|
|
}
|
|
|
|
static int
|
|
rcc_gpio_pin_max(device_t dev, int *maxpin)
|
|
{
|
|
struct rcc_gpio_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
*maxpin = sc->sc_gpio_npins - 1;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rcc_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
|
|
{
|
|
struct rcc_gpio_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
if (pin > sc->sc_gpio_npins)
|
|
return (EINVAL);
|
|
|
|
*caps = rcc_pins[pin].caps;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rcc_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
|
|
{
|
|
struct rcc_gpio_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
if (pin > sc->sc_gpio_npins)
|
|
return (EINVAL);
|
|
|
|
/* Flags cannot be changed. */
|
|
*flags = rcc_pins[pin].caps;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rcc_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
|
|
{
|
|
struct rcc_gpio_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
if (pin > sc->sc_gpio_npins)
|
|
return (EINVAL);
|
|
|
|
memcpy(name, rcc_pins[pin].name, GPIOMAXNAME);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rcc_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
|
|
{
|
|
struct rcc_gpio_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
if (pin > sc->sc_gpio_npins)
|
|
return (EINVAL);
|
|
|
|
/* Flags cannot be changed - risk of short-circuit!!! */
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rcc_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
|
|
{
|
|
struct rcc_gpio_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
if (pin > sc->sc_gpio_npins)
|
|
return (EINVAL);
|
|
|
|
RCC_GPIO_LOCK(sc);
|
|
if (value)
|
|
sc->sc_output |= (1 << rcc_pins[pin].pin);
|
|
else
|
|
sc->sc_output &= ~(1 << rcc_pins[pin].pin);
|
|
RCC_WRITE(sc, RCC_GPIO_GP_LVL, sc->sc_output);
|
|
RCC_GPIO_UNLOCK(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rcc_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
|
|
{
|
|
struct rcc_gpio_softc *sc;
|
|
uint32_t value;
|
|
|
|
sc = device_get_softc(dev);
|
|
if (pin > sc->sc_gpio_npins)
|
|
return (EINVAL);
|
|
|
|
RCC_GPIO_LOCK(sc);
|
|
if (rcc_pins[pin].caps & GPIO_PIN_INPUT)
|
|
value = RCC_READ(sc, RCC_GPIO_GP_LVL);
|
|
else
|
|
value = sc->sc_output;
|
|
RCC_GPIO_UNLOCK(sc);
|
|
*val = (value & (1 << rcc_pins[pin].pin)) ? 1 : 0;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rcc_gpio_pin_toggle(device_t dev, uint32_t pin)
|
|
{
|
|
struct rcc_gpio_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
if (pin > sc->sc_gpio_npins)
|
|
return (EINVAL);
|
|
|
|
RCC_GPIO_LOCK(sc);
|
|
if ((sc->sc_output & (1 << rcc_pins[pin].pin)) == 0)
|
|
sc->sc_output |= (1 << rcc_pins[pin].pin);
|
|
else
|
|
sc->sc_output &= ~(1 << rcc_pins[pin].pin);
|
|
RCC_WRITE(sc, RCC_GPIO_GP_LVL, sc->sc_output);
|
|
RCC_GPIO_UNLOCK(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rcc_gpio_probe(device_t dev)
|
|
{
|
|
char *prod;
|
|
int port;
|
|
|
|
/*
|
|
* We don't know of any PnP ID's for this GPIO controller.
|
|
*/
|
|
if (isa_get_logicalid(dev) != 0)
|
|
return (ENXIO);
|
|
|
|
/*
|
|
* We have to have an IO port hint that is valid.
|
|
*/
|
|
port = isa_get_port(dev);
|
|
if (port != RCC_GPIO_BASE)
|
|
return (ENXIO);
|
|
|
|
prod = kern_getenv("smbios.system.product");
|
|
if (prod == NULL ||
|
|
(strcmp(prod, "RCC-VE") != 0 && strcmp(prod, "RCC-DFF") != 0))
|
|
return (ENXIO);
|
|
|
|
device_set_desc(dev, "RCC-VE/DFF GPIO controller");
|
|
|
|
return (BUS_PROBE_DEFAULT);
|
|
}
|
|
|
|
static int
|
|
rcc_gpio_attach(device_t dev)
|
|
{
|
|
int i;
|
|
struct rcc_gpio_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
sc->sc_dev = dev;
|
|
|
|
/* Allocate IO resources. */
|
|
sc->sc_io_rid = 0;
|
|
sc->sc_io_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
|
|
&sc->sc_io_rid, RF_ACTIVE);
|
|
if (sc->sc_io_res == NULL) {
|
|
device_printf(dev, "cannot allocate memory window\n");
|
|
return (ENXIO);
|
|
}
|
|
sc->sc_bst = rman_get_bustag(sc->sc_io_res);
|
|
sc->sc_bsh = rman_get_bushandle(sc->sc_io_res);
|
|
mtx_init(&sc->sc_mtx, "rcc-gpio", "gpio", MTX_DEF);
|
|
|
|
/* Initialize the pins. */
|
|
sc->sc_gpio_npins = nitems(rcc_pins);
|
|
for (i = 0; i < sc->sc_gpio_npins; i++) {
|
|
/* Enable it for GPIO. */
|
|
rcc_gpio_modify_bits(sc, RCC_GPIO_USE_SEL, 0, rcc_pins[i].pin);
|
|
/* Set the pin as input or output. */
|
|
if (rcc_pins[i].caps & GPIO_PIN_OUTPUT)
|
|
rcc_gpio_modify_bits(sc, RCC_GPIO_IO_SEL,
|
|
rcc_pins[i].pin, 0);
|
|
else
|
|
rcc_gpio_modify_bits(sc, RCC_GPIO_IO_SEL,
|
|
0, rcc_pins[i].pin);
|
|
}
|
|
RCC_WRITE(sc, RCC_GPIO_GP_LVL, sc->sc_output);
|
|
|
|
/* Attach the gpiobus. */
|
|
sc->sc_busdev = gpiobus_attach_bus(dev);
|
|
if (sc->sc_busdev == NULL) {
|
|
bus_release_resource(dev, SYS_RES_IOPORT, sc->sc_io_rid,
|
|
sc->sc_io_res);
|
|
mtx_destroy(&sc->sc_mtx);
|
|
return (ENXIO);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rcc_gpio_detach(device_t dev)
|
|
{
|
|
int i;
|
|
struct rcc_gpio_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
gpiobus_detach_bus(dev);
|
|
|
|
/* Disable the GPIO function. */
|
|
for (i = 0; i < sc->sc_gpio_npins; i++)
|
|
rcc_gpio_modify_bits(sc, RCC_GPIO_USE_SEL, rcc_pins[i].pin, 0);
|
|
|
|
if (sc->sc_io_res != NULL)
|
|
bus_release_resource(dev, SYS_RES_IOPORT, sc->sc_io_rid,
|
|
sc->sc_io_res);
|
|
mtx_destroy(&sc->sc_mtx);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static device_method_t rcc_gpio_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, rcc_gpio_probe),
|
|
DEVMETHOD(device_attach, rcc_gpio_attach),
|
|
DEVMETHOD(device_detach, rcc_gpio_detach),
|
|
|
|
/* GPIO protocol */
|
|
DEVMETHOD(gpio_get_bus, rcc_gpio_get_bus),
|
|
DEVMETHOD(gpio_pin_max, rcc_gpio_pin_max),
|
|
DEVMETHOD(gpio_pin_getname, rcc_gpio_pin_getname),
|
|
DEVMETHOD(gpio_pin_getflags, rcc_gpio_pin_getflags),
|
|
DEVMETHOD(gpio_pin_getcaps, rcc_gpio_pin_getcaps),
|
|
DEVMETHOD(gpio_pin_setflags, rcc_gpio_pin_setflags),
|
|
DEVMETHOD(gpio_pin_get, rcc_gpio_pin_get),
|
|
DEVMETHOD(gpio_pin_set, rcc_gpio_pin_set),
|
|
DEVMETHOD(gpio_pin_toggle, rcc_gpio_pin_toggle),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
static devclass_t rcc_gpio_devclass;
|
|
|
|
static driver_t rcc_gpio_driver = {
|
|
"gpio",
|
|
rcc_gpio_methods,
|
|
sizeof(struct rcc_gpio_softc),
|
|
};
|
|
|
|
DRIVER_MODULE(rcc_gpio, isa, rcc_gpio_driver, rcc_gpio_devclass, 0, 0);
|
|
MODULE_DEPEND(rcc_gpio, gpiobus, 1, 1, 1);
|