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320 lines
7.3 KiB
C
320 lines
7.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Adrian Chadd <adrian@FreeBSD.org>
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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 unmodified, this list of conditions, and the following
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* 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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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/rman.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/gpio.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <dev/gpio/gpiobusvar.h>
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#include <dev/fdt/fdt_common.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_pinctrl.h>
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#include "qcom_tlmm_var.h"
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#include "qcom_tlmm_pin.h"
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#include "qcom_tlmm_ipq4018_reg.h"
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#include "qcom_tlmm_ipq4018_hw.h"
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#include "gpio_if.h"
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static struct gpio_pin *
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qcom_tlmm_pin_lookup(struct qcom_tlmm_softc *sc, int pin)
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{
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if (pin >= sc->gpio_npins)
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return (NULL);
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return &sc->gpio_pins[pin];
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}
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static void
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qcom_tlmm_pin_configure(struct qcom_tlmm_softc *sc,
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struct gpio_pin *pin, unsigned int flags)
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{
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GPIO_LOCK_ASSERT(sc);
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/*
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* Manage input/output
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*/
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if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
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pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT);
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if (flags & GPIO_PIN_OUTPUT) {
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/*
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* XXX TODO: read GPIO_PIN_PRESET_LOW /
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* GPIO_PIN_PRESET_HIGH and if we're a GPIO
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* function pin here, set the output
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* pin value before we flip on oe_output.
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*/
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pin->gp_flags |= GPIO_PIN_OUTPUT;
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qcom_tlmm_ipq4018_hw_pin_set_oe_output(sc,
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pin->gp_pin);
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} else {
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pin->gp_flags |= GPIO_PIN_INPUT;
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qcom_tlmm_ipq4018_hw_pin_set_oe_input(sc,
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pin->gp_pin);
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}
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}
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/*
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* Set pull-up / pull-down configuration
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*/
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if (flags & GPIO_PIN_PULLUP) {
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pin->gp_flags |= GPIO_PIN_PULLUP;
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qcom_tlmm_ipq4018_hw_pin_set_pupd_config(sc, pin->gp_pin,
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QCOM_TLMM_PIN_PUPD_CONFIG_PULL_UP);
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} else if (flags & GPIO_PIN_PULLDOWN) {
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pin->gp_flags |= GPIO_PIN_PULLDOWN;
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qcom_tlmm_ipq4018_hw_pin_set_pupd_config(sc, pin->gp_pin,
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QCOM_TLMM_PIN_PUPD_CONFIG_PULL_DOWN);
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} else if ((flags & (GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN)) ==
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(GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN)) {
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pin->gp_flags |= GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN;
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qcom_tlmm_ipq4018_hw_pin_set_pupd_config(sc, pin->gp_pin,
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QCOM_TLMM_PIN_PUPD_CONFIG_BUS_HOLD);
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} else {
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pin->gp_flags &= ~(GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN);
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qcom_tlmm_ipq4018_hw_pin_set_pupd_config(sc, pin->gp_pin,
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QCOM_TLMM_PIN_PUPD_CONFIG_DISABLE);
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}
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}
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device_t
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qcom_tlmm_get_bus(device_t dev)
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{
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struct qcom_tlmm_softc *sc;
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sc = device_get_softc(dev);
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return (sc->busdev);
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}
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int
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qcom_tlmm_pin_max(device_t dev, int *maxpin)
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{
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struct qcom_tlmm_softc *sc = device_get_softc(dev);
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*maxpin = sc->gpio_npins - 1;
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return (0);
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}
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int
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qcom_tlmm_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
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{
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struct qcom_tlmm_softc *sc = device_get_softc(dev);
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struct gpio_pin *p;
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p = qcom_tlmm_pin_lookup(sc, pin);
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if (p == NULL)
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return (EINVAL);
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GPIO_LOCK(sc);
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*caps = p->gp_caps;
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GPIO_UNLOCK(sc);
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return (0);
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}
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int
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qcom_tlmm_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
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{
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struct qcom_tlmm_softc *sc = device_get_softc(dev);
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uint32_t ret = 0, val;
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bool is_output;
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qcom_tlmm_pin_pupd_config_t pupd_config;
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if (pin >= sc->gpio_npins)
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return (EINVAL);
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*flags = 0;
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GPIO_LOCK(sc);
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/* Lookup function - see what it is, whether we're a GPIO line */
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ret = qcom_tlmm_ipq4018_hw_pin_get_function(sc, pin, &val);
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if (ret != 0)
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goto done;
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/* Lookup input/output state */
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ret = qcom_tlmm_ipq4018_hw_pin_get_oe_state(sc, pin, &is_output);
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if (ret != 0)
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goto done;
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if (is_output)
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*flags |= GPIO_PIN_OUTPUT;
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else
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*flags |= GPIO_PIN_INPUT;
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/* Lookup pull-up / pull-down state */
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ret = qcom_tlmm_ipq4018_hw_pin_get_pupd_config(sc, pin,
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&pupd_config);
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if (ret != 0)
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goto done;
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switch (pupd_config) {
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case QCOM_TLMM_PIN_PUPD_CONFIG_DISABLE:
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break;
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case QCOM_TLMM_PIN_PUPD_CONFIG_PULL_DOWN:
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*flags |= GPIO_PIN_PULLDOWN;
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break;
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case QCOM_TLMM_PIN_PUPD_CONFIG_PULL_UP:
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*flags |= GPIO_PIN_PULLUP;
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break;
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case QCOM_TLMM_PIN_PUPD_CONFIG_BUS_HOLD:
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*flags |= (GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN);
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break;
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}
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done:
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GPIO_UNLOCK(sc);
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return (ret);
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}
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int
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qcom_tlmm_pin_getname(device_t dev, uint32_t pin, char *name)
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{
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struct qcom_tlmm_softc *sc = device_get_softc(dev);
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struct gpio_pin *p;
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p = qcom_tlmm_pin_lookup(sc, pin);
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if (p == NULL)
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return (EINVAL);
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GPIO_LOCK(sc);
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memcpy(name, p->gp_name, GPIOMAXNAME);
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GPIO_UNLOCK(sc);
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return (0);
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}
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int
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qcom_tlmm_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
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{
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struct qcom_tlmm_softc *sc = device_get_softc(dev);
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struct gpio_pin *p;
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p = qcom_tlmm_pin_lookup(sc, pin);
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if (p == NULL)
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return (EINVAL);
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GPIO_LOCK(sc);
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qcom_tlmm_pin_configure(sc, p, flags);
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GPIO_UNLOCK(sc);
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return (0);
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}
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int
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qcom_tlmm_pin_set(device_t dev, uint32_t pin, unsigned int value)
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{
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struct qcom_tlmm_softc *sc = device_get_softc(dev);
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int ret;
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if (pin >= sc->gpio_npins)
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return (EINVAL);
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GPIO_LOCK(sc);
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ret = qcom_tlmm_ipq4018_hw_pin_set_output_value(sc, pin, value);
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GPIO_UNLOCK(sc);
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return (ret);
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}
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int
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qcom_tlmm_pin_get(device_t dev, uint32_t pin, unsigned int *val)
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{
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struct qcom_tlmm_softc *sc = device_get_softc(dev);
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int ret;
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if (pin >= sc->gpio_npins)
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return (EINVAL);
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GPIO_LOCK(sc);
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ret = qcom_tlmm_ipq4018_hw_pin_get_input_value(sc, pin, val);
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GPIO_UNLOCK(sc);
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return (ret);
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}
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int
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qcom_tlmm_pin_toggle(device_t dev, uint32_t pin)
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{
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struct qcom_tlmm_softc *sc = device_get_softc(dev);
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int ret;
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if (pin >= sc->gpio_npins)
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return (EINVAL);
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GPIO_LOCK(sc);
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ret = qcom_tlmm_ipq4018_hw_pin_toggle_output_value(sc, pin);
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GPIO_UNLOCK(sc);
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return (ret);
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}
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int
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qcom_tlmm_filter(void *arg)
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{
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/* TODO: something useful */
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return (FILTER_STRAY);
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}
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void
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qcom_tlmm_intr(void *arg)
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{
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struct qcom_tlmm_softc *sc = arg;
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GPIO_LOCK(sc);
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/* TODO: something useful */
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GPIO_UNLOCK(sc);
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}
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/*
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* ofw bus interface
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*/
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phandle_t
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qcom_tlmm_pin_get_node(device_t dev, device_t bus)
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{
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/* We only have one child, the GPIO bus, which needs our own node. */
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return (ofw_bus_get_node(dev));
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}
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