299b6c9cb1
It is stored in the clock-frequency property. In case of failure, fallback to the harcoded value stored in the compat data. Also, while here improve style. Tested on LS1046ARDB and x86 PC. Reviewed by: mw Obtained from: Semihalf Differential Revision: https://reviews.freebsd.org/D36326
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2001 M. Warner Losh <imp@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, 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, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_bus.h>
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#include <dev/uart/uart_cpu_acpi.h>
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#include <contrib/dev/acpica/include/acpi.h>
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#include <contrib/dev/acpica/include/accommon.h>
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#include <dev/acpica/acpivar.h>
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static int uart_acpi_probe(device_t dev);
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static device_method_t uart_acpi_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, uart_acpi_probe),
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DEVMETHOD(device_attach, uart_bus_attach),
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DEVMETHOD(device_detach, uart_bus_detach),
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DEVMETHOD(device_resume, uart_bus_resume),
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{ 0, 0 }
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};
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static driver_t uart_acpi_driver = {
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uart_driver_name,
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uart_acpi_methods,
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sizeof(struct uart_softc),
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};
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static struct acpi_uart_compat_data *
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uart_acpi_find_device(device_t dev)
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{
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struct acpi_uart_compat_data **cd, *cd_it;
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ACPI_HANDLE h;
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if ((h = acpi_get_handle(dev)) == NULL)
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return (NULL);
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SET_FOREACH(cd, uart_acpi_class_and_device_set) {
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for (cd_it = *cd; cd_it->cd_hid != NULL; cd_it++) {
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if (acpi_MatchHid(h, cd_it->cd_hid))
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return (cd_it);
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}
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}
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return (NULL);
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}
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static int
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uart_acpi_probe(device_t dev)
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{
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struct acpi_uart_compat_data *cd;
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struct uart_softc *sc;
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uint32_t rclk;
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ssize_t size;
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sc = device_get_softc(dev);
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rclk = 0;
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cd = uart_acpi_find_device(dev);
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if (cd == NULL)
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return (ENXIO);
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sc->sc_class = cd->cd_class;
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if (cd->cd_desc != NULL)
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device_set_desc(dev, cd->cd_desc);
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size = device_get_property(dev, "clock-frequency", &rclk,
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sizeof(rclk), DEVICE_PROP_UINT32);
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if (size < 0 || rclk == 0)
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rclk = cd->cd_rclk;
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return (uart_bus_probe(dev, cd->cd_regshft, cd->cd_regiowidth,
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rclk, 0, 0, cd->cd_quirks));
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}
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DRIVER_MODULE(uart, acpi, uart_acpi_driver, 0, 0);
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