260 lines
6.5 KiB
C
260 lines
6.5 KiB
C
/*-
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* Copyright 2015 Alexander Kabaev <kan@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Ingenic JZ4780 pinctrl driver.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/bus.h>
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#include <sys/gpio.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <machine/bus.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/fdt/fdt_pinctrl.h>
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#include <dev/fdt/simplebus.h>
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#include <mips/ingenic/jz4780_regs.h>
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#include "jz4780_gpio_if.h"
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struct jz4780_pinctrl_softc {
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struct simplebus_softc ssc;
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device_t dev;
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};
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#define CHIP_REG_STRIDE 256
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#define CHIP_REG_OFFSET(base, chip) ((base) + (chip) * CHIP_REG_STRIDE)
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static int
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jz4780_pinctrl_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_is_compatible(dev, "ingenic,jz4780-pinctrl"))
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return (ENXIO);
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device_set_desc(dev, "Ingenic JZ4780 GPIO");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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jz4780_pinctrl_attach(device_t dev)
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{
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struct jz4780_pinctrl_softc *sc;
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struct resource_list *rs;
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struct resource_list_entry *re;
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phandle_t dt_parent, dt_child;
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int i, ret;
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sc = device_get_softc(dev);
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sc->dev = dev;
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/*
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* Fetch our own resource list to dole memory between children
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*/
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rs = BUS_GET_RESOURCE_LIST(device_get_parent(dev), dev);
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if (rs == NULL)
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return (ENXIO);
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re = resource_list_find(rs, SYS_RES_MEMORY, 0);
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if (re == NULL)
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return (ENXIO);
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simplebus_init(dev, 0);
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/* Iterate over this node children, looking for pin controllers */
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dt_parent = ofw_bus_get_node(dev);
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i = 0;
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for (dt_child = OF_child(dt_parent); dt_child != 0;
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dt_child = OF_peer(dt_child)) {
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struct simplebus_devinfo *ndi;
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device_t child;
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bus_addr_t phys;
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bus_size_t size;
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/* Add gpio controller child */
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if (!OF_hasprop(dt_child, "gpio-controller"))
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continue;
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child = simplebus_add_device(dev, dt_child, 0, NULL, -1, NULL);
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if (child == NULL)
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break;
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/* Setup child resources */
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phys = CHIP_REG_OFFSET(re->start, i);
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size = CHIP_REG_STRIDE;
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if (phys + size - 1 <= re->end) {
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ndi = device_get_ivars(child);
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resource_list_add(&ndi->rl, SYS_RES_MEMORY, 0,
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phys, phys + size - 1, size);
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}
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i++;
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}
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ret = bus_generic_attach(dev);
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if (ret == 0) {
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fdt_pinctrl_register(dev, "ingenic,pins");
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fdt_pinctrl_configure_tree(dev);
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}
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return (ret);
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}
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static int
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jz4780_pinctrl_detach(device_t dev)
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{
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bus_generic_detach(dev);
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return (0);
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}
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struct jx4780_bias_prop {
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const char *name;
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uint32_t bias;
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};
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static struct jx4780_bias_prop jx4780_bias_table[] = {
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{ "bias-disable", 0 },
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{ "bias-pull-up", GPIO_PIN_PULLUP },
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{ "bias-pull-down", GPIO_PIN_PULLDOWN },
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};
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static int
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jz4780_pinctrl_parse_pincfg(phandle_t pincfgxref, uint32_t *bias_value)
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{
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phandle_t pincfg_node;
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int i;
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pincfg_node = OF_node_from_xref(pincfgxref);
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for (i = 0; i < nitems(jx4780_bias_table); i++) {
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if (OF_hasprop(pincfg_node, jx4780_bias_table[i].name)) {
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*bias_value = jx4780_bias_table[i].bias;
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return 0;
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}
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}
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return -1;
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}
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static device_t
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jz4780_pinctrl_chip_lookup(struct jz4780_pinctrl_softc *sc, phandle_t chipxref)
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{
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device_t chipdev;
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chipdev = OF_device_from_xref(chipxref);
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return chipdev;
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}
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static int
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jz4780_pinctrl_configure_pins(device_t dev, phandle_t cfgxref)
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{
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struct jz4780_pinctrl_softc *sc = device_get_softc(dev);
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device_t chip;
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phandle_t node;
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ssize_t i, len;
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uint32_t *value, *pconf;
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int result;
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node = OF_node_from_xref(cfgxref);
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len = OF_getencprop_alloc_multi(node, "ingenic,pins",
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sizeof(uint32_t) * 4, (void **)&value);
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if (len < 0) {
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device_printf(dev,
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"missing ingenic,pins attribute in FDT\n");
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return (ENXIO);
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}
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pconf = value;
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result = EINVAL;
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for (i = 0; i < len; i++, pconf += 4) {
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uint32_t bias;
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/* Lookup the chip that handles this configuration */
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chip = jz4780_pinctrl_chip_lookup(sc, pconf[0]);
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if (chip == NULL) {
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device_printf(dev,
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"invalid gpio controller reference in FDT\n");
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goto done;
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}
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if (jz4780_pinctrl_parse_pincfg(pconf[3], &bias) != 0) {
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device_printf(dev,
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"invalid pin bias for pin %u on %s in FDT\n",
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pconf[1], ofw_bus_get_name(chip));
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goto done;
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}
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result = JZ4780_GPIO_CONFIGURE_PIN(chip, pconf[1], pconf[2],
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bias);
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if (result != 0) {
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device_printf(dev,
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"failed to configure pin %u on %s\n", pconf[1],
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ofw_bus_get_name(chip));
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goto done;
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}
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}
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result = 0;
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done:
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free(value, M_OFWPROP);
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return (result);
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}
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static device_method_t jz4780_pinctrl_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, jz4780_pinctrl_probe),
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DEVMETHOD(device_attach, jz4780_pinctrl_attach),
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DEVMETHOD(device_detach, jz4780_pinctrl_detach),
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/* fdt_pinctrl interface */
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DEVMETHOD(fdt_pinctrl_configure, jz4780_pinctrl_configure_pins),
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DEVMETHOD_END
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};
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static devclass_t jz4780_pinctrl_devclass;
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DEFINE_CLASS_1(pinctrl, jz4780_pinctrl_driver, jz4780_pinctrl_methods,
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sizeof(struct jz4780_pinctrl_softc), simplebus_driver);
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EARLY_DRIVER_MODULE(pinctrl, simplebus, jz4780_pinctrl_driver,
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jz4780_pinctrl_devclass, 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
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