freebsd-dev/sys/arm/mv/mvebu_gpio.c
Michal Meloun 01c6d79189 mvebu_gpio: Fix settings of gpio pin direction.
Data Output Enable Control register is inverted – 0 means output direction.
Reflect this fact in code.

MFC after:	3 weeks
2021-03-07 11:41:30 +01:00

877 lines
21 KiB
C

/*-
* Copyright (c) 2020 Michal Meloun <mmel@FreeBSD.org>
*
* 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("$FreeBSD$");
/*
* ARMADA 8040 GPIO driver.
*/
#include "opt_platform.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/gpio.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/rman.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <machine/resource.h>
#include <dev/extres/syscon/syscon.h>
#include <dev/gpio/gpiobusvar.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "pic_if.h"
#include "syscon_if.h"
#define GPIO_LOCK(_sc) mtx_lock(&(_sc)->mtx)
#define GPIO_UNLOCK(_sc) mtx_unlock(&(_sc)->mtx)
#define GPIO_LOCK_INIT(_sc) mtx_init(&_sc->mtx, \
device_get_nameunit(_sc->dev), "mvebu_gpio", MTX_DEF)
#define GPIO_LOCK_DESTROY(_sc) mtx_destroy(&_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 GPIO_DATA_OUT 0x00
#define GPIO_CONTROL 0x04
#define GPIO_BLINK_ENA 0x08
#define GPIO_DATA_IN_POL 0x0C
#define GPIO_DATA_IN 0x10
#define GPIO_INT_CAUSE 0x14
#define GPIO_INT_MASK 0x18
#define GPIO_INT_LEVEL_MASK 0x1C
#define GPIO_CONTROL_SET 0x28
#define GPIO_CONTROL_CLR 0x2C
#define GPIO_DATA_SET 0x30
#define GPIO_DATA_CLR 0x34
#define GPIO_BIT(_p) ((_p) % 32)
#define GPIO_REGNUM(_p) ((_p) / 32)
#define MV_GPIO_MAX_NIRQS 4
#define MV_GPIO_MAX_NPINS 32
struct mvebu_gpio_irqsrc {
struct intr_irqsrc isrc;
u_int irq;
bool is_level;
bool is_inverted;
};
struct mvebu_gpio_softc;
struct mvebu_gpio_irq_cookie {
struct mvebu_gpio_softc *sc;
int bank_num;
};
struct mvebu_gpio_softc {
device_t dev;
device_t busdev;
struct mtx mtx;
struct syscon *syscon;
uint32_t offset;
struct resource *irq_res[MV_GPIO_MAX_NIRQS];
void *irq_ih[MV_GPIO_MAX_NIRQS];
struct mvebu_gpio_irq_cookie irq_cookies[MV_GPIO_MAX_NIRQS];
int gpio_npins;
struct gpio_pin gpio_pins[MV_GPIO_MAX_NPINS];
struct mvebu_gpio_irqsrc *isrcs;
};
static struct ofw_compat_data compat_data[] = {
{"marvell,armada-8k-gpio", 1},
{NULL, 0}
};
/* --------------------------------------------------------------------------
*
* GPIO
*
*/
static inline void
gpio_write(struct mvebu_gpio_softc *sc, bus_size_t reg,
struct gpio_pin *pin, uint32_t val)
{
int bit;
bit = GPIO_BIT(pin->gp_pin);
SYSCON_WRITE_4(sc->syscon, sc->offset + GPIO_REGNUM(pin->gp_pin) + reg,
(val & 1) << bit);
}
static inline uint32_t
gpio_read(struct mvebu_gpio_softc *sc, bus_size_t reg, struct gpio_pin *pin)
{
int bit;
uint32_t val;
bit = GPIO_BIT(pin->gp_pin);
val = SYSCON_READ_4(sc->syscon,
sc->offset + GPIO_REGNUM(pin->gp_pin) + reg);
return (val >> bit) & 1;
}
static inline void
gpio_modify(struct mvebu_gpio_softc *sc, bus_size_t reg,
struct gpio_pin *pin, uint32_t val)
{
int bit;
bit = GPIO_BIT(pin->gp_pin);
SYSCON_MODIFY_4(sc->syscon, sc->offset + GPIO_REGNUM(pin->gp_pin) + reg,
1 << bit, (val & 1) << bit);
}
static void
mvebu_gpio_pin_configure(struct mvebu_gpio_softc *sc, struct gpio_pin *pin,
unsigned int flags)
{
if ((flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) == 0)
return;
/* Manage input/output */
pin->gp_flags &= ~(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT);
if (flags & GPIO_PIN_OUTPUT) {
pin->gp_flags |= GPIO_PIN_OUTPUT;
gpio_write(sc, GPIO_CONTROL_CLR, pin, 1);
} else {
pin->gp_flags |= GPIO_PIN_INPUT;
gpio_write(sc, GPIO_CONTROL_SET, pin, 1);
}
}
static device_t
mvebu_gpio_get_bus(device_t dev)
{
struct mvebu_gpio_softc *sc;
sc = device_get_softc(dev);
return (sc->busdev);
}
static int
mvebu_gpio_pin_max(device_t dev, int *maxpin)
{
struct mvebu_gpio_softc *sc;
sc = device_get_softc(dev);
*maxpin = sc->gpio_npins - 1;
return (0);
}
static int
mvebu_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
{
struct mvebu_gpio_softc *sc;
sc = device_get_softc(dev);
if (pin >= sc->gpio_npins)
return (EINVAL);
*caps = sc->gpio_pins[pin].gp_caps;
return (0);
}
static int
mvebu_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
{
struct mvebu_gpio_softc *sc;
sc = device_get_softc(dev);
if (pin >= sc->gpio_npins)
return (EINVAL);
*flags = sc->gpio_pins[pin].gp_flags;
return (0);
}
static int
mvebu_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
{
struct mvebu_gpio_softc *sc;
sc = device_get_softc(dev);
if (pin >= sc->gpio_npins)
return (EINVAL);
memcpy(name, sc->gpio_pins[pin].gp_name, GPIOMAXNAME);
return (0);
}
static int
mvebu_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
{
struct mvebu_gpio_softc *sc;
sc = device_get_softc(dev);
if (pin >= sc->gpio_npins)
return (EINVAL);
mvebu_gpio_pin_configure(sc, &sc->gpio_pins[pin], flags);
return (0);
}
static int
mvebu_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
{
struct mvebu_gpio_softc *sc;
sc = device_get_softc(dev);
if (pin >= sc->gpio_npins)
return (EINVAL);
if (value != 0)
gpio_write(sc, GPIO_DATA_SET, &sc->gpio_pins[pin], 1);
else
gpio_write(sc, GPIO_DATA_CLR, &sc->gpio_pins[pin], 1);
return (0);
}
static int
mvebu_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
{
struct mvebu_gpio_softc *sc;
sc = device_get_softc(dev);
if (pin >= sc->gpio_npins)
return (EINVAL);
GPIO_LOCK(sc);
*val = gpio_read(sc, GPIO_DATA_IN, &sc->gpio_pins[pin]);
*val ^= gpio_read(sc, GPIO_DATA_IN_POL, &sc->gpio_pins[pin]);
GPIO_UNLOCK(sc);
return (0);
}
static int
mvebu_gpio_pin_toggle(device_t dev, uint32_t pin)
{
struct mvebu_gpio_softc *sc;
uint32_t val;
sc = device_get_softc(dev);
if (pin >= sc->gpio_npins)
return (EINVAL);
GPIO_LOCK(sc);
mvebu_gpio_pin_get(sc->dev, pin, &val);
if (val != 0)
gpio_write(sc, GPIO_DATA_CLR, &sc->gpio_pins[pin], 1);
else
gpio_write(sc, GPIO_DATA_SET, &sc->gpio_pins[pin], 1);
GPIO_UNLOCK(sc);
return (0);
}
/* --------------------------------------------------------------------------
*
* Interrupts
*
*/
static inline void
intr_modify(struct mvebu_gpio_softc *sc, bus_addr_t reg,
struct mvebu_gpio_irqsrc *mgi, uint32_t val)
{
int bit;
bit = GPIO_BIT(mgi->irq);
SYSCON_MODIFY_4(sc->syscon,
sc->offset + GPIO_REGNUM(mgi->irq) + reg, 1 << bit,
(val & 1) << bit);
}
static inline void
mvebu_gpio_isrc_mask(struct mvebu_gpio_softc *sc,
struct mvebu_gpio_irqsrc *mgi, uint32_t val)
{
if (mgi->is_level)
intr_modify(sc, GPIO_INT_LEVEL_MASK, mgi, val);
else
intr_modify(sc, GPIO_INT_MASK, mgi, val);
}
static inline void
mvebu_gpio_isrc_eoi(struct mvebu_gpio_softc *sc,
struct mvebu_gpio_irqsrc *mgi)
{
int bit;
if (!mgi->is_level) {
bit = GPIO_BIT(mgi->irq);
SYSCON_WRITE_4(sc->syscon,
sc->offset + GPIO_REGNUM(mgi->irq) + GPIO_INT_CAUSE,
~(1 << bit));
}
}
static int
mvebu_gpio_pic_attach(struct mvebu_gpio_softc *sc)
{
int rv;
uint32_t irq;
const char *name;
sc->isrcs = malloc(sizeof(*sc->isrcs) * sc->gpio_npins, M_DEVBUF,
M_WAITOK | M_ZERO);
name = device_get_nameunit(sc->dev);
for (irq = 0; irq < sc->gpio_npins; irq++) {
sc->isrcs[irq].irq = irq;
sc->isrcs[irq].is_level = false;
sc->isrcs[irq].is_inverted = false;
rv = intr_isrc_register(&sc->isrcs[irq].isrc,
sc->dev, 0, "%s,%u", name, irq);
if (rv != 0)
return (rv); /* XXX deregister ISRCs */
}
if (intr_pic_register(sc->dev,
OF_xref_from_node(ofw_bus_get_node(sc->dev))) == NULL)
return (ENXIO);
return (0);
}
static int
mvebu_gpio_pic_detach(struct mvebu_gpio_softc *sc)
{
/*
* There has not been established any procedure yet
* how to detach PIC from living system correctly.
*/
device_printf(sc->dev, "%s: not implemented yet\n", __func__);
return (EBUSY);
}
static void
mvebu_gpio_pic_disable_intr(device_t dev, struct intr_irqsrc *isrc)
{
struct mvebu_gpio_softc *sc;
struct mvebu_gpio_irqsrc *mgi;
sc = device_get_softc(dev);
mgi = (struct mvebu_gpio_irqsrc *)isrc;
mvebu_gpio_isrc_mask(sc, mgi, 0);
}
static void
mvebu_gpio_pic_enable_intr(device_t dev, struct intr_irqsrc *isrc)
{
struct mvebu_gpio_softc *sc;
struct mvebu_gpio_irqsrc *mgi;
sc = device_get_softc(dev);
mgi = (struct mvebu_gpio_irqsrc *)isrc;
mvebu_gpio_isrc_mask(sc, mgi, 1);
}
static int
mvebu_gpio_pic_map_fdt(struct mvebu_gpio_softc *sc, u_int ncells,
pcell_t *cells, u_int *irqp, bool *invertedp, bool *levelp)
{
bool inverted, level;
/*
* The first cell is the interrupt number.
* The second cell is used to specify flags:
* bits[3:0] trigger type and level flags:
* 1 = low-to-high edge triggered.
* 2 = high-to-low edge triggered.
* 4 = active high level-sensitive.
* 8 = active low level-sensitive.
*/
if (ncells != 2 || cells[0] >= sc->gpio_npins)
return (EINVAL);
switch (cells[1]) {
case 1:
inverted = false;
level = false;
break;
case 2:
inverted = true;
level = false;
break;
case 4:
inverted = false;
level = true;
break;
case 8:
inverted = true;
level = true;
break;
default:
return (EINVAL);
}
*irqp = cells[0];
if (invertedp != NULL)
*invertedp = inverted;
if (levelp != NULL)
*levelp = level;
return (0);
}
static int
mvebu_gpio_pic_map_gpio(struct mvebu_gpio_softc *sc, u_int gpio_pin_num,
u_int gpio_pin_flags, u_int intr_mode, u_int *irqp, bool *invertedp,
bool *levelp)
{
bool inverted, level;
if (gpio_pin_num >= sc->gpio_npins)
return (EINVAL);
switch (intr_mode) {
case GPIO_INTR_LEVEL_LOW:
inverted = true;
level = true;
break;
case GPIO_INTR_LEVEL_HIGH:
inverted = false;
level = true;
break;
case GPIO_INTR_CONFORM:
case GPIO_INTR_EDGE_RISING:
inverted = false;
level = false;
break;
case GPIO_INTR_EDGE_FALLING:
inverted = true;
level = false;
break;
default:
return (EINVAL);
}
*irqp = gpio_pin_num;
if (invertedp != NULL)
*invertedp = inverted;
if (levelp != NULL)
*levelp = level;
return (0);
}
static int
mvebu_gpio_pic_map_intr(device_t dev, struct intr_map_data *data,
struct intr_irqsrc **isrcp)
{
int rv;
u_int irq;
struct mvebu_gpio_softc *sc;
sc = device_get_softc(dev);
if (data->type == INTR_MAP_DATA_FDT) {
struct intr_map_data_fdt *daf;
daf = (struct intr_map_data_fdt *)data;
rv = mvebu_gpio_pic_map_fdt(sc, daf->ncells, daf->cells, &irq,
NULL, NULL);
} else if (data->type == INTR_MAP_DATA_GPIO) {
struct intr_map_data_gpio *dag;
dag = (struct intr_map_data_gpio *)data;
rv = mvebu_gpio_pic_map_gpio(sc, dag->gpio_pin_num,
dag->gpio_pin_flags, dag->gpio_intr_mode, &irq, NULL, NULL);
} else
return (ENOTSUP);
if (rv == 0)
*isrcp = &sc->isrcs[irq].isrc;
return (rv);
}
static void
mvebu_gpio_pic_post_filter(device_t dev, struct intr_irqsrc *isrc)
{
struct mvebu_gpio_softc *sc;
struct mvebu_gpio_irqsrc *mgi;
sc = device_get_softc(dev);
mgi = (struct mvebu_gpio_irqsrc *)isrc;
if (mgi->is_level)
mvebu_gpio_isrc_eoi(sc, mgi);
}
static void
mvebu_gpio_pic_post_ithread(device_t dev, struct intr_irqsrc *isrc)
{
struct mvebu_gpio_softc *sc;
struct mvebu_gpio_irqsrc *mgi;
sc = device_get_softc(dev);
mgi = (struct mvebu_gpio_irqsrc *)isrc;
mvebu_gpio_isrc_mask(sc, mgi, 1);
}
static void
mvebu_gpio_pic_pre_ithread(device_t dev, struct intr_irqsrc *isrc)
{
struct mvebu_gpio_softc *sc;
struct mvebu_gpio_irqsrc *mgi;
sc = device_get_softc(dev);
mgi = (struct mvebu_gpio_irqsrc *)isrc;
mvebu_gpio_isrc_mask(sc, mgi, 0);
if (mgi->is_level)
mvebu_gpio_isrc_eoi(sc, mgi);
}
static int
mvebu_gpio_pic_setup_intr(device_t dev, struct intr_irqsrc *isrc,
struct resource *res, struct intr_map_data *data)
{
u_int irq;
bool inverted, level;
int rv;
struct mvebu_gpio_softc *sc;
struct mvebu_gpio_irqsrc *mgi;
sc = device_get_softc(dev);
mgi = (struct mvebu_gpio_irqsrc *)isrc;
if (data == NULL)
return (ENOTSUP);
/* Get and check config for an interrupt. */
if (data->type == INTR_MAP_DATA_FDT) {
struct intr_map_data_fdt *daf;
daf = (struct intr_map_data_fdt *)data;
rv = mvebu_gpio_pic_map_fdt(sc, daf->ncells, daf->cells, &irq,
&inverted, &level);
} else if (data->type == INTR_MAP_DATA_GPIO) {
struct intr_map_data_gpio *dag;
dag = (struct intr_map_data_gpio *)data;
rv = mvebu_gpio_pic_map_gpio(sc, dag->gpio_pin_num,
dag->gpio_pin_flags, dag->gpio_intr_mode, &irq,
&inverted, &level);
} else
return (ENOTSUP);
if (rv != 0)
return (EINVAL);
/*
* If this is a setup for another handler,
* only check that its configuration match.
*/
if (isrc->isrc_handlers != 0)
return (
mgi->is_level == level && mgi->is_inverted == inverted ?
0 : EINVAL);
mgi->is_level = level;
mgi->is_inverted = inverted;
GPIO_LOCK(sc);
intr_modify(sc, GPIO_DATA_IN_POL, mgi, inverted ? 1 : 0);
mvebu_gpio_pic_enable_intr(dev, isrc);
GPIO_UNLOCK(sc);
return (0);
}
static int
mvebu_gpio_pic_teardown_intr(device_t dev, struct intr_irqsrc *isrc,
struct resource *res, struct intr_map_data *data)
{
struct mvebu_gpio_softc *sc;
struct mvebu_gpio_irqsrc *mgi;
sc = device_get_softc(dev);
mgi = (struct mvebu_gpio_irqsrc *)isrc;
if (isrc->isrc_handlers == 0)
mvebu_gpio_isrc_mask(sc, mgi, 0);
return (0);
}
/* --------------------------------------------------------------------------
*
* Bus
*
*/
static int
mvebu_gpio_intr(void *arg)
{
u_int i, lvl, edge;
struct mvebu_gpio_softc *sc;
struct trapframe *tf;
struct mvebu_gpio_irqsrc *mgi;
struct mvebu_gpio_irq_cookie *cookie;
cookie = (struct mvebu_gpio_irq_cookie *)arg;
sc = cookie->sc;
tf = curthread->td_intr_frame;
for (i = 0; i < sc->gpio_npins; i++) {
lvl = gpio_read(sc, GPIO_DATA_IN, &sc->gpio_pins[i]);
lvl &= gpio_read(sc, GPIO_INT_LEVEL_MASK, &sc->gpio_pins[i]);
edge = gpio_read(sc, GPIO_DATA_IN, &sc->gpio_pins[i]);
edge &= gpio_read(sc, GPIO_INT_LEVEL_MASK, &sc->gpio_pins[i]);
if (edge == 0 && lvl == 0)
continue;
mgi = &sc->isrcs[i];
if (!mgi->is_level)
mvebu_gpio_isrc_eoi(sc, mgi);
if (intr_isrc_dispatch(&mgi->isrc, tf) != 0) {
mvebu_gpio_isrc_mask(sc, mgi, 0);
if (mgi->is_level)
mvebu_gpio_isrc_eoi(sc, mgi);
device_printf(sc->dev,
"Stray irq %u disabled\n", mgi->irq);
}
}
return (FILTER_HANDLED);
}
static int
mvebu_gpio_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
return (ENXIO);
device_set_desc(dev, "Marvell Integrated GPIO Controller");
return (0);
}
static int
mvebu_gpio_detach(device_t dev)
{
struct mvebu_gpio_softc *sc;
int i;
sc = device_get_softc(dev);
KASSERT(mtx_initialized(&sc->mtx), ("gpio mutex not initialized"));
for (i = 0; i < MV_GPIO_MAX_NIRQS; i++) {
if (sc->irq_ih[i] != NULL)
bus_teardown_intr(dev, sc->irq_res[i], sc->irq_ih[i]);
}
if (sc->isrcs != NULL)
mvebu_gpio_pic_detach(sc);
gpiobus_detach_bus(dev);
for (i = 0; i < MV_GPIO_MAX_NIRQS; i++) {
if (sc->irq_res[i] != NULL)
bus_release_resource(dev, SYS_RES_IRQ, 0,
sc->irq_res[i]);
}
GPIO_LOCK_DESTROY(sc);
return(0);
}
static int
mvebu_gpio_attach(device_t dev)
{
struct mvebu_gpio_softc *sc;
phandle_t node;
struct gpio_pin *pin;
pcell_t pincnt;
int i, rv, rid;
sc = device_get_softc(dev);
sc->dev = dev;
node = ofw_bus_get_node(dev);
GPIO_LOCK_INIT(sc);
pincnt = 0;
rv = OF_getencprop(node, "ngpios", &pincnt, sizeof(pcell_t));
if (rv < 0) {
device_printf(dev,
"ERROR: no pin-count or ngpios entry found!\n");
return (ENXIO);
}
sc->gpio_npins = MIN(pincnt, MV_GPIO_MAX_NPINS);
if (bootverbose)
device_printf(dev,
"%d pins available\n", sc->gpio_npins);
rv = OF_getencprop(node, "offset", &sc->offset, sizeof(sc->offset));
if (rv == -1) {
device_printf(dev, "ERROR: no 'offset' property found!\n");
return (ENXIO);
}
if (SYSCON_GET_HANDLE(sc->dev, &sc->syscon) != 0 ||
sc->syscon == NULL) {
device_printf(dev, "ERROR: cannot get syscon handle!\n");
return (ENXIO);
}
/* Allocate interrupts. */
for (i = 0; i < MV_GPIO_MAX_NIRQS; i++) {
sc->irq_cookies[i].sc = sc;
sc->irq_cookies[i].bank_num = i;
rid = i;
sc->irq_res[i] = bus_alloc_resource_any(dev, SYS_RES_IRQ,
&rid, RF_ACTIVE);
if (sc->irq_res[i] == NULL)
break;
if ((bus_setup_intr(dev, sc->irq_res[i],
INTR_TYPE_MISC | INTR_MPSAFE, mvebu_gpio_intr, NULL,
&sc->irq_cookies[i], &sc->irq_ih[i]))) {
device_printf(dev,
"WARNING: unable to register interrupt handler\n");
mvebu_gpio_detach(dev);
return (ENXIO);
}
}
/* Init GPIO pins */
for (i = 0; i < sc->gpio_npins; i++) {
pin = sc->gpio_pins + i;
pin->gp_pin = i;
if (sc->irq_res[0] != NULL)
pin->gp_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT |
GPIO_INTR_LEVEL_LOW | GPIO_INTR_LEVEL_HIGH |
GPIO_INTR_EDGE_RISING | GPIO_INTR_EDGE_FALLING;
else
pin->gp_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT;
pin->gp_flags =
gpio_read(sc, GPIO_CONTROL, &sc->gpio_pins[i]) == 0 ?
GPIO_PIN_OUTPUT : GPIO_PIN_INPUT;
snprintf(pin->gp_name, GPIOMAXNAME, "gpio%d", i);
/* Init HW */
gpio_modify(sc, GPIO_INT_MASK, pin, 0);
gpio_modify(sc, GPIO_INT_LEVEL_MASK, pin, 0);
gpio_modify(sc, GPIO_INT_CAUSE, pin, 0);
gpio_modify(sc, GPIO_DATA_IN_POL, pin, 0);
gpio_modify(sc, GPIO_BLINK_ENA, pin, 0);
}
if (sc->irq_res[0] != NULL) {
rv = mvebu_gpio_pic_attach(sc);
if (rv != 0) {
device_printf(dev, "WARNING: unable to attach PIC\n");
mvebu_gpio_detach(dev);
return (rv);
}
}
sc->busdev = gpiobus_attach_bus(dev);
if (sc->busdev == NULL) {
mvebu_gpio_detach(dev);
return (ENXIO);
}
return (bus_generic_attach(dev));
}
static int
mvebu_gpio_map_gpios(device_t dev, phandle_t pdev, phandle_t gparent,
int gcells, pcell_t *gpios, uint32_t *pin, uint32_t *flags)
{
if (gcells != 2)
return (ERANGE);
*pin = gpios[0];
*flags= gpios[1];
return (0);
}
static phandle_t
mvebu_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 mvebu_gpio_methods[] = {
DEVMETHOD(device_probe, mvebu_gpio_probe),
DEVMETHOD(device_attach, mvebu_gpio_attach),
DEVMETHOD(device_detach, mvebu_gpio_detach),
/* Interrupt controller interface */
DEVMETHOD(pic_disable_intr, mvebu_gpio_pic_disable_intr),
DEVMETHOD(pic_enable_intr, mvebu_gpio_pic_enable_intr),
DEVMETHOD(pic_map_intr, mvebu_gpio_pic_map_intr),
DEVMETHOD(pic_setup_intr, mvebu_gpio_pic_setup_intr),
DEVMETHOD(pic_teardown_intr, mvebu_gpio_pic_teardown_intr),
DEVMETHOD(pic_post_filter, mvebu_gpio_pic_post_filter),
DEVMETHOD(pic_post_ithread, mvebu_gpio_pic_post_ithread),
DEVMETHOD(pic_pre_ithread, mvebu_gpio_pic_pre_ithread),
/* GPIO protocol */
DEVMETHOD(gpio_get_bus, mvebu_gpio_get_bus),
DEVMETHOD(gpio_pin_max, mvebu_gpio_pin_max),
DEVMETHOD(gpio_pin_getname, mvebu_gpio_pin_getname),
DEVMETHOD(gpio_pin_getflags, mvebu_gpio_pin_getflags),
DEVMETHOD(gpio_pin_getcaps, mvebu_gpio_pin_getcaps),
DEVMETHOD(gpio_pin_setflags, mvebu_gpio_pin_setflags),
DEVMETHOD(gpio_pin_get, mvebu_gpio_pin_get),
DEVMETHOD(gpio_pin_set, mvebu_gpio_pin_set),
DEVMETHOD(gpio_pin_toggle, mvebu_gpio_pin_toggle),
DEVMETHOD(gpio_map_gpios, mvebu_gpio_map_gpios),
/* ofw_bus interface */
DEVMETHOD(ofw_bus_get_node, mvebu_gpio_get_node),
DEVMETHOD_END
};
static devclass_t mvebu_gpio_devclass;
static DEFINE_CLASS_0(gpio, mvebu_gpio_driver, mvebu_gpio_methods,
sizeof(struct mvebu_gpio_softc));
EARLY_DRIVER_MODULE(mvebu_gpio, simplebus, mvebu_gpio_driver,
mvebu_gpio_devclass, NULL, NULL,
BUS_PASS_TIMER + BUS_PASS_ORDER_LAST);