6e54367a22
rename of_search_compatible() to of_compatible_lookup(). Standardize on of_compatible_match() for driver matching, and adapt all call sites.
147 lines
4.0 KiB
C
147 lines
4.0 KiB
C
/* $NetBSD: syscon.c,v 1.5 2021/01/27 03:10:21 thorpej Exp $ */
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/*-
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* Copyright (c) 2018 Jared McNeill <jmcneill@invisible.ca>
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: syscon.c,v 1.5 2021/01/27 03:10:21 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/systm.h>
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#include <sys/sysctl.h>
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#include <sys/kmem.h>
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#include <sys/gpio.h>
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#include <dev/fdt/fdtvar.h>
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#include <dev/fdt/syscon.h>
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struct syscon_softc {
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device_t sc_dev;
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bus_space_tag_t sc_bst;
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bus_space_handle_t sc_bsh;
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kmutex_t sc_lock;
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struct syscon sc_syscon;
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};
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static int syscon_match(device_t, cfdata_t, void *);
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static void syscon_attach(device_t, device_t, void *);
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static const struct device_compatible_entry compat_data[] = {
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{ .compat = "syscon" },
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{ .compat = "simple-mfd" },
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DEVICE_COMPAT_EOL
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};
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CFATTACH_DECL_NEW(syscon, sizeof(struct syscon_softc),
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syscon_match, syscon_attach, NULL, NULL);
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static void
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syscon_generic_lock(void *priv)
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{
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struct syscon_softc * const sc = priv;
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mutex_enter(&sc->sc_lock);
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}
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static void
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syscon_generic_unlock(void *priv)
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{
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struct syscon_softc * const sc = priv;
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mutex_exit(&sc->sc_lock);
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}
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static uint32_t
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syscon_generic_read_4(void *priv, bus_size_t reg)
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{
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struct syscon_softc * const sc = priv;
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KASSERT(mutex_owned(&sc->sc_lock));
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return bus_space_read_4(sc->sc_bst, sc->sc_bsh, reg);
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}
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static void
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syscon_generic_write_4(void *priv, bus_size_t reg, uint32_t val)
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{
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struct syscon_softc * const sc = priv;
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KASSERT(mutex_owned(&sc->sc_lock));
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bus_space_write_4(sc->sc_bst, sc->sc_bsh, reg, val);
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}
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static int
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syscon_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct fdt_attach_args * const faa = aux;
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return of_compatible_match(faa->faa_phandle, compat_data);
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}
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static void
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syscon_attach(device_t parent, device_t self, void *aux)
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{
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struct syscon_softc * const sc = device_private(self);
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struct fdt_attach_args * const faa = aux;
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const int phandle = faa->faa_phandle;
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bus_addr_t addr;
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bus_size_t size;
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int child;
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if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
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aprint_error(": couldn't get registers\n");
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return;
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}
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sc->sc_dev = self;
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sc->sc_bst = faa->faa_bst;
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if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
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aprint_error(": couldn't map registers\n");
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return;
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}
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mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_VM);
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sc->sc_syscon.priv = sc;
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sc->sc_syscon.lock = syscon_generic_lock;
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sc->sc_syscon.unlock = syscon_generic_unlock;
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sc->sc_syscon.read_4 = syscon_generic_read_4;
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sc->sc_syscon.write_4 = syscon_generic_write_4;
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aprint_naive("\n");
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aprint_normal(": System Controller Registers\n");
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fdtbus_register_syscon(self, phandle, &sc->sc_syscon);
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fdt_add_bus(self, phandle, faa);
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child = of_find_firstchild_byname(phandle, "clocks");
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if (child > 0)
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fdt_add_bus(self, child, faa);
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}
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