2685996b0e
Simplify and make extensible the config_search() / config_found() / config_attach() interfaces: rather than having different variants for which arguments you want pass along, just have a single call that takes a variadic list of tag-value arguments. Adjust all call sites: - Simplify wherever possible; don't pass along arguments that aren't actually needed. - Don't be explicit about what interface attribute is attaching if the device only has one. (More simplification.) - Add a config_probe() function to be used in indirect configuiration situations, making is visibly easier to see when indirect config is in play, and allowing for future change in semantics. (As of now, this is just a wrapper around config_match(), but that is an implementation detail.) Remove unnecessary or redundant interface attributes where they're not needed. There are currently 5 "cfargs" defined: - CFARG_SUBMATCH (submatch function for direct config) - CFARG_SEARCH (search function for indirect config) - CFARG_IATTR (interface attribte) - CFARG_LOCATORS (locators array) - CFARG_DEVHANDLE (devhandle_t - wraps OFW, ACPI, etc. handles) ...and a sentinel value CFARG_EOL. Add some extra sanity checking to ensure that interface attributes aren't ambiguous. Use CFARG_DEVHANDLE in MI FDT, OFW, and ACPI code, and macppc and shark ports to associate those device handles with device_t instance. This will trickle trough to more places over time (need back-end for pre-OFW Sun OBP; any others?).
117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
/* $NetBSD: pl061.c,v 1.3 2021/04/24 23:36:55 thorpej Exp $ */
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/*
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* Copyright (c) 2018 Jonathan A. Kollasch
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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 COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: pl061.c,v 1.3 2021/04/24 23:36:55 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/device.h>
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#include <sys/intr.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/kmem.h>
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#include <sys/gpio.h>
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#include <dev/gpio/gpiovar.h>
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#include "gpio.h"
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#include <dev/ic/pl061reg.h>
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#include <dev/ic/pl061var.h>
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void
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plgpio_attach(struct plgpio_softc *sc)
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{
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struct gpiobus_attach_args gba;
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u_int pin;
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sc->sc_gc.gp_cookie = sc;
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sc->sc_gc.gp_pin_read = plgpio_pin_read;
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sc->sc_gc.gp_pin_write = plgpio_pin_write;
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sc->sc_gc.gp_pin_ctl = plgpio_pin_ctl;
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const uint32_t cnf = PLGPIO_READ(sc, PL061_GPIOAFSEL_REG) |
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sc->sc_reserved_mask;
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for (pin = 0; pin < 8; pin++) {
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sc->sc_pins[pin].pin_num = pin;
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/* skip pins in hardware control mode */
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if ((cnf & __BIT(pin)) != 0)
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continue;
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sc->sc_pins[pin].pin_caps =
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GPIO_PIN_INPUT | GPIO_PIN_OUTPUT |
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GPIO_PIN_TRISTATE;
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sc->sc_pins[pin].pin_state =
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plgpio_pin_read(sc, pin);
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}
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memset(&gba, 0, sizeof(gba));
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gba.gba_gc = &sc->sc_gc;
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gba.gba_pins = sc->sc_pins;
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gba.gba_npins = 8;
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#if NGPIO > 0
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config_found(sc->sc_dev, &gba, gpiobus_print, CFARG_EOL);
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#endif
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}
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int
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plgpio_pin_read(void *priv, int pin)
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{
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struct plgpio_softc * const sc = priv;
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const uint32_t v = PLGPIO_READ(sc, PL061_GPIODATA_REG(1<<pin));
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return (v >> pin) & 1;
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}
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void
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plgpio_pin_write(void *priv, int pin, int val)
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{
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struct plgpio_softc * const sc = priv;
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PLGPIO_WRITE(sc, PL061_GPIODATA_REG(1 << pin), val << pin);
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}
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void
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plgpio_pin_ctl(void *priv, int pin, int flags)
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{
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struct plgpio_softc * const sc = priv;
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uint32_t v;
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if (flags & GPIO_PIN_INPUT) {
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v = PLGPIO_READ(sc, PL061_GPIODIR_REG);
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v &= ~(1 << pin);
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PLGPIO_WRITE(sc, PL061_GPIODIR_REG, v);
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} else if (flags & GPIO_PIN_OUTPUT) {
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v = PLGPIO_READ(sc, PL061_GPIODIR_REG);
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v |= (1 << pin);
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PLGPIO_WRITE(sc, PL061_GPIODIR_REG, v);
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}
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}
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