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starfive: add a syscon driver
It serves the purpose of attaching syscon devices as early as possible; this is required for early attachment of the PLL clock driver. Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D44270
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riscv/starfive/starfive_syscon.c standard
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sys/riscv/starfive/starfive_syscon.c
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sys/riscv/starfive/starfive_syscon.c
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2024 The FreeBSD Foundation
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*
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* This software was developed by Mitchell Horne <mhorne@FreeBSD.org> under
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* sponsorship from the FreeBSD Foundation.
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*/
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/*
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* StarFive syscon driver.
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*
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* On the JH7110, the PLL clock driver is a child of the sys-syscon device.
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* This needs to probe very early (BUS_PASS_BUS + BUS_PASS_ORDER_EARLY).
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*/
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#include <sys/param.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/mutex.h>
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#include <machine/bus.h>
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#include <dev/ofw/openfirm.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/syscon/syscon.h>
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#include <dev/syscon/syscon_generic.h>
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#include <dev/fdt/simple_mfd.h>
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enum starfive_syscon_type {
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JH7110_SYSCON_SYS = 1,
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JH7110_SYSCON_AON,
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JH7110_SYSCON_STG,
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};
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static struct ofw_compat_data compat_data[] = {
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{ "starfive,jh7110-sys-syscon", JH7110_SYSCON_SYS },
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{ "starfive,jh7110-aon-syscon", JH7110_SYSCON_AON },
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{ "starfive,jh7110-stg-syscon", JH7110_SYSCON_STG },
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{ NULL, 0 }
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};
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static int
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starfive_syscon_probe(device_t dev)
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{
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enum starfive_syscon_type type;
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
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if (type == 0)
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return (ENXIO);
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switch (type) {
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case JH7110_SYSCON_SYS:
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device_set_desc(dev, "JH7110 SYS syscon");
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break;
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case JH7110_SYSCON_AON:
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device_set_desc(dev, "JH7110 AON syscon");
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break;
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case JH7110_SYSCON_STG:
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device_set_desc(dev, "JH7110 STG syscon");
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break;
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}
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return (BUS_PROBE_DEFAULT);
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}
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static device_method_t starfive_syscon_methods[] = {
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DEVMETHOD(device_probe, starfive_syscon_probe),
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DEVMETHOD_END
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};
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DEFINE_CLASS_1(starfive_syscon, starfive_syscon_driver, starfive_syscon_methods,
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sizeof(struct syscon_generic_softc), simple_mfd_driver);
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EARLY_DRIVER_MODULE(starfive_syscon, simplebus, starfive_syscon_driver, 0, 0,
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BUS_PASS_BUS + BUS_PASS_ORDER_EARLY);
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MODULE_VERSION(starfive_syscon, 1);
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