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freebsd-skq/sys/dev/nctgpio/nctgpio.c
Andriy Gapon 0222625608 nctgpio: change default pin names to those used by the datasheet(s) 
That is, instead of the current GPIO00 - GPIO15 the names will be GPIO00
- GPIO07, GPIO10 - GPIO17.  The first digit is a GPIO "bank" / group
number and the second one is a pin number within the bank.  Alternative
view is that the pin names are changed from decimal numbering scheme to
octal one (as there are 8 pins per bank).

Discussed with:	cem, gonzo
MFC after:	2 weeks
2019-07-01 15:43:48 +00:00

807 lines
17 KiB
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/*-
* Copyright (c) 2016 Daniel Wyatt <Daniel.Wyatt@gmail.com>
* 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.
*
* $FreeBSD$
*
*/
/*
* Nuvoton GPIO driver.
*
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/eventhandler.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/gpio.h>
#include <isa/isavar.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <dev/gpio/gpiobusvar.h>
#include "gpio_if.h"
/*
* Global configuration registers (CR).
*/
#define NCT_CR_LDN 0x07 /* Logical Device Number */
#define NCT_CR_CHIP_ID 0x20 /* Chip ID */
#define NCT_CR_CHIP_ID_H 0x20 /* Chip ID (high byte) */
#define NCT_CR_CHIP_ID_L 0x21 /* Chip ID (low byte) */
#define NCT_CR_OPT_1 0x26 /* Global Options (1) */
/* Logical Device Numbers. */
#define NCT_LDN_GPIO 0x07
#define NCT_LDN_GPIO_CFG 0x08
#define NCT_LDN_GPIO_MODE 0x0f
/* Logical Device 7 */
#define NCT_LD7_GPIO_ENABLE 0x30
#define NCT_LD7_GPIO0_IOR 0xe0
#define NCT_LD7_GPIO0_DAT 0xe1
#define NCT_LD7_GPIO0_INV 0xe2
#define NCT_LD7_GPIO0_DST 0xe3
#define NCT_LD7_GPIO1_IOR 0xe4
#define NCT_LD7_GPIO1_DAT 0xe5
#define NCT_LD7_GPIO1_INV 0xe6
#define NCT_LD7_GPIO1_DST 0xe7
/* Logical Device F */
#define NCT_LDF_GPIO0_OUTCFG 0xe0
#define NCT_LDF_GPIO1_OUTCFG 0xe1
#define NCT_EXTFUNC_ENTER 0x87
#define NCT_EXTFUNC_EXIT 0xaa
#define NCT_MAX_PIN 15
#define NCT_IS_VALID_PIN(_p) ((_p) >= 0 && (_p) <= NCT_MAX_PIN)
#define NCT_PIN_BIT(_p) (1 << ((_p) % 8))
#define NCT_GPIO_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | \
GPIO_PIN_OPENDRAIN | GPIO_PIN_PUSHPULL | \
GPIO_PIN_INVIN | GPIO_PIN_INVOUT)
struct nct_softc {
device_t dev;
device_t busdev;
struct mtx mtx;
struct resource *portres;
int rid;
struct gpio_pin pins[NCT_MAX_PIN + 1];
};
#define GPIO_LOCK_INIT(_sc) mtx_init(&(_sc)->mtx, \
device_get_nameunit(dev), NULL, MTX_DEF)
#define GPIO_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->mtx)
#define GPIO_LOCK(_sc) mtx_lock(&(_sc)->mtx)
#define GPIO_UNLOCK(_sc) mtx_unlock(&(_sc)->mtx)
#define GPIO_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->mtx, MA_OWNED)
#define GPIO_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->mtx, MA_NOTOWNED)
#define NCT_BARRIER_WRITE(_sc) \
bus_barrier((_sc)->portres, 0, 2, BUS_SPACE_BARRIER_WRITE)
#define NCT_BARRIER_READ_WRITE(_sc) \
bus_barrier((_sc)->portres, 0, 2, \
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE)
static void ext_cfg_enter(struct nct_softc *);
static void ext_cfg_exit(struct nct_softc *);
/*
* Potential Extended Function Enable Register addresses.
* Same address as EFIR.
*/
uint8_t probe_addrs[] = {0x2e, 0x4e};
struct nuvoton_vendor_device_id {
uint16_t chip_id;
const char * descr;
} nct_devs[] = {
{
.chip_id = 0x1061,
.descr = "Nuvoton NCT5104D",
},
{
.chip_id = 0xc452,
.descr = "Nuvoton NCT5104D (PC-Engines APU)",
},
{
.chip_id = 0xc453,
.descr = "Nuvoton NCT5104D (PC-Engines APU3)",
},
};
static void
write_cfg_reg_1(struct nct_softc *sc, uint8_t reg, uint8_t value)
{
GPIO_ASSERT_LOCKED(sc);
bus_write_1(sc->portres, 0, reg);
NCT_BARRIER_WRITE(sc);
bus_write_1(sc->portres, 1, value);
NCT_BARRIER_WRITE(sc);
}
static uint8_t
read_cfg_reg_1(struct nct_softc *sc, uint8_t reg)
{
uint8_t value;
GPIO_ASSERT_LOCKED(sc);
bus_write_1(sc->portres, 0, reg);
NCT_BARRIER_READ_WRITE(sc);
value = bus_read_1(sc->portres, 1);
NCT_BARRIER_READ_WRITE(sc);
return (value);
}
static uint16_t
read_cfg_reg_2(struct nct_softc *sc, uint8_t reg)
{
uint16_t value;
value = read_cfg_reg_1(sc, reg) << 8;
value |= read_cfg_reg_1(sc, reg + 1);
return (value);
}
/*
* Enable extended function mode.
*
*/
static void
ext_cfg_enter(struct nct_softc *sc)
{
GPIO_ASSERT_LOCKED(sc);
bus_write_1(sc->portres, 0, NCT_EXTFUNC_ENTER);
NCT_BARRIER_WRITE(sc);
bus_write_1(sc->portres, 0, NCT_EXTFUNC_ENTER);
NCT_BARRIER_WRITE(sc);
}
/*
* Disable extended function mode.
*
*/
static void
ext_cfg_exit(struct nct_softc *sc)
{
GPIO_ASSERT_LOCKED(sc);
bus_write_1(sc->portres, 0, NCT_EXTFUNC_EXIT);
NCT_BARRIER_WRITE(sc);
}
/*
* Select a Logical Device.
*/
static void
select_ldn(struct nct_softc *sc, uint8_t ldn)
{
write_cfg_reg_1(sc, NCT_CR_LDN, ldn);
}
/*
* Get the GPIO Input/Output register address
* for a pin.
*/
static uint8_t
nct_ior_addr(uint32_t pin_num)
{
uint8_t addr;
addr = NCT_LD7_GPIO0_IOR;
if (pin_num > 7)
addr = NCT_LD7_GPIO1_IOR;
return (addr);
}
/*
* Get the GPIO Data register address for a pin.
*/
static uint8_t
nct_dat_addr(uint32_t pin_num)
{
uint8_t addr;
addr = NCT_LD7_GPIO0_DAT;
if (pin_num > 7)
addr = NCT_LD7_GPIO1_DAT;
return (addr);
}
/*
* Get the GPIO Inversion register address
* for a pin.
*/
static uint8_t
nct_inv_addr(uint32_t pin_num)
{
uint8_t addr;
addr = NCT_LD7_GPIO0_INV;
if (pin_num > 7)
addr = NCT_LD7_GPIO1_INV;
return (addr);
}
/*
* Get the GPIO Output Configuration/Mode
* register address for a pin.
*/
static uint8_t
nct_outcfg_addr(uint32_t pin_num)
{
uint8_t addr;
addr = NCT_LDF_GPIO0_OUTCFG;
if (pin_num > 7)
addr = NCT_LDF_GPIO1_OUTCFG;
return (addr);
}
/*
* Set a pin to output mode.
*/
static void
nct_set_pin_is_output(struct nct_softc *sc, uint32_t pin_num)
{
uint8_t reg;
uint8_t ior;
reg = nct_ior_addr(pin_num);
select_ldn(sc, NCT_LDN_GPIO);
ior = read_cfg_reg_1(sc, reg);
ior &= ~(NCT_PIN_BIT(pin_num));
write_cfg_reg_1(sc, reg, ior);
}
/*
* Set a pin to input mode.
*/
static void
nct_set_pin_is_input(struct nct_softc *sc, uint32_t pin_num)
{
uint8_t reg;
uint8_t ior;
reg = nct_ior_addr(pin_num);
select_ldn(sc, NCT_LDN_GPIO);
ior = read_cfg_reg_1(sc, reg);
ior |= NCT_PIN_BIT(pin_num);
write_cfg_reg_1(sc, reg, ior);
}
/*
* Check whether a pin is configured as an input.
*/
static bool
nct_pin_is_input(struct nct_softc *sc, uint32_t pin_num)
{
uint8_t reg;
uint8_t ior;
reg = nct_ior_addr(pin_num);
select_ldn(sc, NCT_LDN_GPIO);
ior = read_cfg_reg_1(sc, reg);
return (ior & NCT_PIN_BIT(pin_num));
}
/*
* Write a value to an output pin.
*/
static void
nct_write_pin(struct nct_softc *sc, uint32_t pin_num, uint8_t data)
{
uint8_t reg;
uint8_t value;
reg = nct_dat_addr(pin_num);
select_ldn(sc, NCT_LDN_GPIO);
value = read_cfg_reg_1(sc, reg);
if (data)
value |= NCT_PIN_BIT(pin_num);
else
value &= ~(NCT_PIN_BIT(pin_num));
write_cfg_reg_1(sc, reg, value);
}
static bool
nct_read_pin(struct nct_softc *sc, uint32_t pin_num)
{
uint8_t reg;
reg = nct_dat_addr(pin_num);
select_ldn(sc, NCT_LDN_GPIO);
return (read_cfg_reg_1(sc, reg) & NCT_PIN_BIT(pin_num));
}
static void
nct_set_pin_is_inverted(struct nct_softc *sc, uint32_t pin_num)
{
uint8_t reg;
uint8_t inv;
reg = nct_inv_addr(pin_num);
select_ldn(sc, NCT_LDN_GPIO);
inv = read_cfg_reg_1(sc, reg);
inv |= (NCT_PIN_BIT(pin_num));
write_cfg_reg_1(sc, reg, inv);
}
static void
nct_set_pin_not_inverted(struct nct_softc *sc, uint32_t pin_num)
{
uint8_t reg;
uint8_t inv;
reg = nct_inv_addr(pin_num);
select_ldn(sc, NCT_LDN_GPIO);
inv = read_cfg_reg_1(sc, reg);
inv &= ~(NCT_PIN_BIT(pin_num));
write_cfg_reg_1(sc, reg, inv);
}
static bool
nct_pin_is_inverted(struct nct_softc *sc, uint32_t pin_num)
{
uint8_t reg;
uint8_t inv;
reg = nct_inv_addr(pin_num);
select_ldn(sc, NCT_LDN_GPIO);
inv = read_cfg_reg_1(sc, reg);
return (inv & NCT_PIN_BIT(pin_num));
}
static void
nct_set_pin_opendrain(struct nct_softc *sc, uint32_t pin_num)
{
uint8_t reg;
uint8_t outcfg;
reg = nct_outcfg_addr(pin_num);
select_ldn(sc, NCT_LDN_GPIO_MODE);
outcfg = read_cfg_reg_1(sc, reg);
outcfg |= (NCT_PIN_BIT(pin_num));
write_cfg_reg_1(sc, reg, outcfg);
}
static void
nct_set_pin_pushpull(struct nct_softc *sc, uint32_t pin_num)
{
uint8_t reg;
uint8_t outcfg;
reg = nct_outcfg_addr(pin_num);
select_ldn(sc, NCT_LDN_GPIO_MODE);
outcfg = read_cfg_reg_1(sc, reg);
outcfg &= ~(NCT_PIN_BIT(pin_num));
write_cfg_reg_1(sc, reg, outcfg);
}
static bool
nct_pin_is_opendrain(struct nct_softc *sc, uint32_t pin_num)
{
uint8_t reg;
uint8_t outcfg;
reg = nct_outcfg_addr(pin_num);
select_ldn(sc, NCT_LDN_GPIO_MODE);
outcfg = read_cfg_reg_1(sc, reg);
return (outcfg & NCT_PIN_BIT(pin_num));
}
static void
nct_identify(driver_t *driver, device_t parent)
{
if (device_find_child(parent, driver->name, 0) != NULL)
return;
BUS_ADD_CHILD(parent, 0, driver->name, 0);
}
static int
nct_probe(device_t dev)
{
int i, j;
int rc;
struct nct_softc *sc;
uint16_t chipid;
/* Make sure we do not claim some ISA PNP device. */
if (isa_get_logicalid(dev) != 0)
return (ENXIO);
sc = device_get_softc(dev);
for (i = 0; i < nitems(probe_addrs); i++) {
sc->rid = 0;
sc->portres = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->rid,
probe_addrs[i], probe_addrs[i] + 1, 2, RF_ACTIVE);
if (sc->portres == NULL)
continue;
GPIO_LOCK_INIT(sc);
GPIO_ASSERT_UNLOCKED(sc);
GPIO_LOCK(sc);
ext_cfg_enter(sc);
chipid = read_cfg_reg_2(sc, NCT_CR_CHIP_ID);
ext_cfg_exit(sc);
GPIO_UNLOCK(sc);
GPIO_LOCK_DESTROY(sc);
bus_release_resource(dev, SYS_RES_IOPORT, sc->rid, sc->portres);
bus_delete_resource(dev, SYS_RES_IOPORT, sc->rid);
for (j = 0; j < nitems(nct_devs); j++) {
if (chipid == nct_devs[j].chip_id) {
rc = bus_set_resource(dev, SYS_RES_IOPORT, 0, probe_addrs[i], 2);
if (rc != 0) {
device_printf(dev, "bus_set_resource failed for address 0x%02X\n", probe_addrs[i]);
continue;
}
device_set_desc(dev, nct_devs[j].descr);
return (BUS_PROBE_DEFAULT);
}
}
}
return (ENXIO);
}
static int
nct_attach(device_t dev)
{
struct nct_softc *sc;
int i;
sc = device_get_softc(dev);
sc->rid = 0;
sc->portres = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->rid,
0ul, ~0ul, 2, RF_ACTIVE);
if (sc->portres == NULL) {
device_printf(dev, "cannot allocate ioport\n");
return (ENXIO);
}
GPIO_LOCK_INIT(sc);
GPIO_ASSERT_UNLOCKED(sc);
GPIO_LOCK(sc);
ext_cfg_enter(sc);
select_ldn(sc, NCT_LDN_GPIO);
/* Enable gpio0 and gpio1. */
write_cfg_reg_1(sc, NCT_LD7_GPIO_ENABLE,
read_cfg_reg_1(sc, NCT_LD7_GPIO_ENABLE) | 0x03);
for (i = 0; i <= NCT_MAX_PIN; i++) {
struct gpio_pin *pin;
pin = &sc->pins[i];
pin->gp_pin = i;
pin->gp_caps = NCT_GPIO_CAPS;
pin->gp_flags = 0;
snprintf(pin->gp_name, GPIOMAXNAME, "GPIO%02o", i);
pin->gp_name[GPIOMAXNAME - 1] = '\0';
if (nct_pin_is_input(sc, i))
pin->gp_flags |= GPIO_PIN_INPUT;
else
pin->gp_flags |= GPIO_PIN_OUTPUT;
if (nct_pin_is_opendrain(sc, i))
pin->gp_flags |= GPIO_PIN_OPENDRAIN;
else
pin->gp_flags |= GPIO_PIN_PUSHPULL;
if (nct_pin_is_inverted(sc, i))
pin->gp_flags |= (GPIO_PIN_INVIN | GPIO_PIN_INVOUT);
}
GPIO_UNLOCK(sc);
sc->busdev = gpiobus_attach_bus(dev);
if (sc->busdev == NULL) {
GPIO_ASSERT_UNLOCKED(sc);
GPIO_LOCK(sc);
ext_cfg_exit(sc);
GPIO_UNLOCK(sc);
bus_release_resource(dev, SYS_RES_IOPORT, sc->rid, sc->portres);
GPIO_LOCK_DESTROY(sc);
return (ENXIO);
}
return (0);
}
static int
nct_detach(device_t dev)
{
struct nct_softc *sc;
sc = device_get_softc(dev);
gpiobus_detach_bus(dev);
GPIO_ASSERT_UNLOCKED(sc);
GPIO_LOCK(sc);
ext_cfg_exit(sc);
GPIO_UNLOCK(sc);
/* Cleanup resources. */
bus_release_resource(dev, SYS_RES_IOPORT, sc->rid, sc->portres);
GPIO_LOCK_DESTROY(sc);
return (0);
}
static device_t
nct_gpio_get_bus(device_t dev)
{
struct nct_softc *sc;
sc = device_get_softc(dev);
return (sc->busdev);
}
static int
nct_gpio_pin_max(device_t dev, int *npins)
{
*npins = NCT_MAX_PIN;
return (0);
}
static int
nct_gpio_pin_set(device_t dev, uint32_t pin_num, uint32_t pin_value)
{
struct nct_softc *sc;
if (!NCT_IS_VALID_PIN(pin_num))
return (EINVAL);
sc = device_get_softc(dev);
GPIO_ASSERT_UNLOCKED(sc);
GPIO_LOCK(sc);
nct_write_pin(sc, pin_num, pin_value);
GPIO_UNLOCK(sc);
return (0);
}
static int
nct_gpio_pin_get(device_t dev, uint32_t pin_num, uint32_t *pin_value)
{
struct nct_softc *sc;
if (!NCT_IS_VALID_PIN(pin_num))
return (EINVAL);
sc = device_get_softc(dev);
GPIO_ASSERT_UNLOCKED(sc);
GPIO_LOCK(sc);
*pin_value = nct_read_pin(sc, pin_num);
GPIO_UNLOCK(sc);
return (0);
}
static int
nct_gpio_pin_toggle(device_t dev, uint32_t pin_num)
{
struct nct_softc *sc;
if (!NCT_IS_VALID_PIN(pin_num))
return (EINVAL);
sc = device_get_softc(dev);
GPIO_ASSERT_UNLOCKED(sc);
GPIO_LOCK(sc);
if (nct_read_pin(sc, pin_num))
nct_write_pin(sc, pin_num, 0);
else
nct_write_pin(sc, pin_num, 1);
GPIO_UNLOCK(sc);
return (0);
}
static int
nct_gpio_pin_getcaps(device_t dev, uint32_t pin_num, uint32_t *caps)
{
struct nct_softc *sc;
if (!NCT_IS_VALID_PIN(pin_num))
return (EINVAL);
sc = device_get_softc(dev);
GPIO_ASSERT_UNLOCKED(sc);
GPIO_LOCK(sc);
*caps = sc->pins[pin_num].gp_caps;
GPIO_UNLOCK(sc);
return (0);
}
static int
nct_gpio_pin_getflags(device_t dev, uint32_t pin_num, uint32_t *flags)
{
struct nct_softc *sc;
if (!NCT_IS_VALID_PIN(pin_num))
return (EINVAL);
sc = device_get_softc(dev);
GPIO_ASSERT_UNLOCKED(sc);
GPIO_LOCK(sc);
*flags = sc->pins[pin_num].gp_flags;
GPIO_UNLOCK(sc);
return (0);
}
static int
nct_gpio_pin_getname(device_t dev, uint32_t pin_num, char *name)
{
struct nct_softc *sc;
if (!NCT_IS_VALID_PIN(pin_num))
return (EINVAL);
sc = device_get_softc(dev);
GPIO_ASSERT_UNLOCKED(sc);
GPIO_LOCK(sc);
memcpy(name, sc->pins[pin_num].gp_name, GPIOMAXNAME);
GPIO_UNLOCK(sc);
return (0);
}
static int
nct_gpio_pin_setflags(device_t dev, uint32_t pin_num, uint32_t flags)
{
struct nct_softc *sc;
struct gpio_pin *pin;
if (!NCT_IS_VALID_PIN(pin_num))
return (EINVAL);
sc = device_get_softc(dev);
pin = &sc->pins[pin_num];
if ((flags & pin->gp_caps) != flags)
return (EINVAL);
GPIO_ASSERT_UNLOCKED(sc);
GPIO_LOCK(sc);
if (flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) {
if ((flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) ==
(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) {
GPIO_UNLOCK(sc);
return (EINVAL);
}
if (flags & GPIO_PIN_INPUT)
nct_set_pin_is_input(sc, pin_num);
else
nct_set_pin_is_output(sc, pin_num);
}
if (flags & (GPIO_PIN_OPENDRAIN | GPIO_PIN_PUSHPULL)) {
if (flags & GPIO_PIN_INPUT) {
GPIO_UNLOCK(sc);
return (EINVAL);
}
if ((flags & (GPIO_PIN_OPENDRAIN | GPIO_PIN_PUSHPULL)) ==
(GPIO_PIN_OPENDRAIN | GPIO_PIN_PUSHPULL)) {
GPIO_UNLOCK(sc);
return (EINVAL);
}
if (flags & GPIO_PIN_OPENDRAIN)
nct_set_pin_opendrain(sc, pin_num);
else
nct_set_pin_pushpull(sc, pin_num);
}
if (flags & (GPIO_PIN_INVIN | GPIO_PIN_INVOUT)) {
if ((flags & (GPIO_PIN_INVIN | GPIO_PIN_INVOUT)) !=
(GPIO_PIN_INVIN | GPIO_PIN_INVOUT)) {
GPIO_UNLOCK(sc);
return (EINVAL);
}
if (flags & GPIO_PIN_INVIN)
nct_set_pin_is_inverted(sc, pin_num);
else
nct_set_pin_not_inverted(sc, pin_num);
}
pin->gp_flags = flags;
GPIO_UNLOCK(sc);
return (0);
}
static device_method_t nct_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, nct_identify),
DEVMETHOD(device_probe, nct_probe),
DEVMETHOD(device_attach, nct_attach),
DEVMETHOD(device_detach, nct_detach),
/* GPIO */
DEVMETHOD(gpio_get_bus, nct_gpio_get_bus),
DEVMETHOD(gpio_pin_max, nct_gpio_pin_max),
DEVMETHOD(gpio_pin_get, nct_gpio_pin_get),
DEVMETHOD(gpio_pin_set, nct_gpio_pin_set),
DEVMETHOD(gpio_pin_toggle, nct_gpio_pin_toggle),
DEVMETHOD(gpio_pin_getname, nct_gpio_pin_getname),
DEVMETHOD(gpio_pin_getcaps, nct_gpio_pin_getcaps),
DEVMETHOD(gpio_pin_getflags, nct_gpio_pin_getflags),
DEVMETHOD(gpio_pin_setflags, nct_gpio_pin_setflags),
DEVMETHOD_END
};
static driver_t nct_isa_driver = {
"gpio",
nct_methods,
sizeof(struct nct_softc)
};
static devclass_t nct_devclass;
DRIVER_MODULE(nctgpio, isa, nct_isa_driver, nct_devclass, NULL, NULL);
MODULE_DEPEND(nctgpio, gpiobus, 1, 1, 1);
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