freebsd-dev/sys/mips/ingenic/jz4780_pinctrl.c
Ruslan Bukin 9a8f61fb5b Bring in support for Ingenic XBurst JZ4780 and
X1000 systems on chips.

Imgtec CI20 and Ingenic CANNA boards supported.

Submitted by:	Alexander Kabaev <kan@FreeBSD.org>
Reviewed by:	Ruslan Bukin <br@FreeBSD.org>
Sponsored by:	DARPA, AFRL
2016-11-19 17:46:18 +00:00

261 lines
6.5 KiB
C

/*-
* Copyright 2015 Alexander Kabaev <kan@FreeBSD.org>
* 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.
*/
/*
* Ingenic JZ4780 pinctrl driver.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/gpio.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/fdt/fdt_common.h>
#include <dev/fdt/fdt_pinctrl.h>
#include <dev/fdt/simplebus.h>
#include <mips/ingenic/jz4780_regs.h>
#include "jz4780_gpio_if.h"
struct jz4780_pinctrl_softc {
struct simplebus_softc ssc;
device_t dev;
};
#define CHIP_REG_STRIDE 256
#define CHIP_REG_OFFSET(base, chip) ((base) + (chip) * CHIP_REG_STRIDE)
static int
jz4780_pinctrl_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "ingenic,jz4780-pinctrl"))
return (ENXIO);
device_set_desc(dev, "Ingenic JZ4780 GPIO");
return (BUS_PROBE_DEFAULT);
}
static int
jz4780_pinctrl_attach(device_t dev)
{
struct jz4780_pinctrl_softc *sc;
struct resource_list *rs;
struct resource_list_entry *re;
phandle_t dt_parent, dt_child;
int i, ret;
sc = device_get_softc(dev);
sc->dev = dev;
/*
* Fetch our own resource list to dole memory between children
*/
rs = BUS_GET_RESOURCE_LIST(device_get_parent(dev), dev);
if (rs == NULL)
return (ENXIO);
re = resource_list_find(rs, SYS_RES_MEMORY, 0);
if (re == NULL)
return (ENXIO);
simplebus_init(dev, 0);
/* Iterate over this node children, looking for pin controllers */
dt_parent = ofw_bus_get_node(dev);
i = 0;
for (dt_child = OF_child(dt_parent); dt_child != 0;
dt_child = OF_peer(dt_child)) {
struct simplebus_devinfo *ndi;
device_t child;
bus_addr_t phys;
bus_size_t size;
/* Add gpio controller child */
if (!OF_hasprop(dt_child, "gpio-controller"))
continue;
child = simplebus_add_device(dev, dt_child, 0, NULL, -1, NULL);
if (child == NULL)
break;
/* Setup child resources */
phys = CHIP_REG_OFFSET(re->start, i);
size = CHIP_REG_STRIDE;
if (phys + size - 1 <= re->end) {
ndi = device_get_ivars(child);
resource_list_add(&ndi->rl, SYS_RES_MEMORY, 0,
phys, phys + size - 1, size);
}
i++;
}
ret = bus_generic_attach(dev);
if (ret == 0) {
fdt_pinctrl_register(dev, "ingenic,pins");
fdt_pinctrl_configure_tree(dev);
}
return (ret);
}
static int
jz4780_pinctrl_detach(device_t dev)
{
bus_generic_detach(dev);
return (0);
}
struct jx4780_bias_prop {
const char *name;
uint32_t bias;
};
static struct jx4780_bias_prop jx4780_bias_table[] = {
{ "bias-disable", 0 },
{ "bias-pull-up", GPIO_PIN_PULLUP },
{ "bias-pull-down", GPIO_PIN_PULLDOWN },
};
static int
jz4780_pinctrl_parse_pincfg(phandle_t pincfgxref, uint32_t *bias_value)
{
phandle_t pincfg_node;
int i;
pincfg_node = OF_node_from_xref(pincfgxref);
for (i = 0; i < nitems(jx4780_bias_table); i++) {
if (OF_hasprop(pincfg_node, jx4780_bias_table[i].name)) {
*bias_value = jx4780_bias_table[i].bias;
return 0;
}
}
return -1;
}
static device_t
jz4780_pinctrl_chip_lookup(struct jz4780_pinctrl_softc *sc, phandle_t chipxref)
{
device_t chipdev;
chipdev = OF_device_from_xref(chipxref);
return chipdev;
}
static int
jz4780_pinctrl_configure_pins(device_t dev, phandle_t cfgxref)
{
struct jz4780_pinctrl_softc *sc = device_get_softc(dev);
device_t chip;
phandle_t node;
ssize_t i, len;
uint32_t *value, *pconf;
int result;
node = OF_node_from_xref(cfgxref);
len = OF_getencprop_alloc(node, "ingenic,pins", sizeof(uint32_t) * 4,
(void **)&value);
if (len < 0) {
device_printf(dev,
"missing ingenic,pins attribute in FDT\n");
return (ENXIO);
}
pconf = value;
result = EINVAL;
for (i = 0; i < len; i++, pconf += 4) {
uint32_t bias;
/* Lookup the chip that handles this configuration */
chip = jz4780_pinctrl_chip_lookup(sc, pconf[0]);
if (chip == NULL) {
device_printf(dev,
"invalid gpio controller reference in FDT\n");
goto done;
}
if (jz4780_pinctrl_parse_pincfg(pconf[3], &bias) != 0) {
device_printf(dev,
"invalid pin bias for pin %u on %s in FDT\n",
pconf[1], ofw_bus_get_name(chip));
goto done;
}
result = JZ4780_GPIO_CONFIGURE_PIN(chip, pconf[1], pconf[2],
bias);
if (result != 0) {
device_printf(dev,
"failed to configure pin %u on %s\n", pconf[1],
ofw_bus_get_name(chip));
goto done;
}
}
result = 0;
done:
free(value, M_OFWPROP);
return (result);
}
static device_method_t jz4780_pinctrl_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, jz4780_pinctrl_probe),
DEVMETHOD(device_attach, jz4780_pinctrl_attach),
DEVMETHOD(device_detach, jz4780_pinctrl_detach),
/* fdt_pinctrl interface */
DEVMETHOD(fdt_pinctrl_configure, jz4780_pinctrl_configure_pins),
DEVMETHOD_END
};
static devclass_t jz4780_pinctrl_devclass;
DEFINE_CLASS_1(pinctrl, jz4780_pinctrl_driver, jz4780_pinctrl_methods,
sizeof(struct jz4780_pinctrl_softc), simplebus_driver);
EARLY_DRIVER_MODULE(pinctrl, simplebus, jz4780_pinctrl_driver,
jz4780_pinctrl_devclass, 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);