718cf2ccb9
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
286 lines
7.2 KiB
C
286 lines
7.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2009-2010 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Semihalf under sponsorship from
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* the FreeBSD Foundation.
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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 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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_platform.h"
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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 <machine/bus.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/uart/uart.h>
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#include <dev/uart/uart_bus.h>
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#include <dev/uart/uart_cpu.h>
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#include <dev/uart/uart_cpu_fdt.h>
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static int uart_fdt_probe(device_t);
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static device_method_t uart_fdt_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, uart_fdt_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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{ 0, 0 }
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};
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static driver_t uart_fdt_driver = {
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uart_driver_name,
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uart_fdt_methods,
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sizeof(struct uart_softc),
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};
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int
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uart_fdt_get_clock(phandle_t node, pcell_t *cell)
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{
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/* clock-frequency is a FreeBSD-only extension. */
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if ((OF_getencprop(node, "clock-frequency", cell,
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sizeof(*cell))) <= 0) {
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/* Try to retrieve parent 'bus-frequency' */
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/* XXX this should go to simple-bus fixup or so */
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if ((OF_getencprop(OF_parent(node), "bus-frequency", cell,
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sizeof(*cell))) <= 0)
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*cell = 0;
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}
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return (0);
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}
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int
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uart_fdt_get_shift(phandle_t node, pcell_t *cell)
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{
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if ((OF_getencprop(node, "reg-shift", cell, sizeof(*cell))) <= 0)
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return (-1);
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return (0);
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}
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int
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uart_fdt_get_io_width(phandle_t node, pcell_t *cell)
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{
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if ((OF_getencprop(node, "reg-io-width", cell, sizeof(*cell))) <= 0)
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return (-1);
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return (0);
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}
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static uintptr_t
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uart_fdt_find_device(device_t dev)
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{
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struct ofw_compat_data **cd;
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const struct ofw_compat_data *ocd;
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SET_FOREACH(cd, uart_fdt_class_and_device_set) {
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ocd = ofw_bus_search_compatible(dev, *cd);
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if (ocd->ocd_data != 0)
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return (ocd->ocd_data);
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}
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return (0);
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}
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static int
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phandle_chosen_propdev(phandle_t chosen, const char *name, phandle_t *node)
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{
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char buf[64];
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char *sep;
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if (OF_getprop(chosen, name, buf, sizeof(buf)) <= 0)
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return (ENXIO);
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/*
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* stdout-path may have a ':' to separate the device from the
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* connection settings. Split the string so we just pass the former
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* to OF_finddevice.
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*/
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sep = strchr(buf, ':');
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if (sep != NULL)
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*sep = '\0';
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if ((*node = OF_finddevice(buf)) == -1)
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return (ENXIO);
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return (0);
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}
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static const struct ofw_compat_data *
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uart_fdt_find_compatible(phandle_t node, const struct ofw_compat_data *cd)
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{
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const struct ofw_compat_data *ocd;
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for (ocd = cd; ocd->ocd_str != NULL; ocd++) {
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if (ofw_bus_node_is_compatible(node, ocd->ocd_str))
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return (ocd);
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}
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return (NULL);
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}
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static uintptr_t
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uart_fdt_find_by_node(phandle_t node, int class_list)
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{
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struct ofw_compat_data **cd;
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const struct ofw_compat_data *ocd;
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if (class_list) {
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SET_FOREACH(cd, uart_fdt_class_set) {
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ocd = uart_fdt_find_compatible(node, *cd);
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if ((ocd != NULL) && (ocd->ocd_data != 0))
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return (ocd->ocd_data);
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}
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} else {
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SET_FOREACH(cd, uart_fdt_class_and_device_set) {
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ocd = uart_fdt_find_compatible(node, *cd);
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if ((ocd != NULL) && (ocd->ocd_data != 0))
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return (ocd->ocd_data);
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}
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}
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return (0);
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}
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int
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uart_cpu_fdt_probe(struct uart_class **classp, bus_space_tag_t *bst,
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bus_space_handle_t *bsh, int *baud, u_int *rclk, u_int *shiftp,
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u_int *iowidthp)
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{
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const char *propnames[] = {"stdout-path", "linux,stdout-path", "stdout",
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"stdin-path", "stdin", NULL};
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const char **name;
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struct uart_class *class;
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phandle_t node, chosen;
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pcell_t br, clk, shift, iowidth;
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char *cp;
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int err;
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/* Has the user forced a specific device node? */
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cp = kern_getenv("hw.fdt.console");
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if (cp == NULL) {
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/*
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* Retrieve /chosen/std{in,out}.
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*/
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node = -1;
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if ((chosen = OF_finddevice("/chosen")) != -1) {
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for (name = propnames; *name != NULL; name++) {
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if (phandle_chosen_propdev(chosen, *name,
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&node) == 0)
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break;
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}
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}
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if (chosen == -1 || *name == NULL)
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node = OF_finddevice("serial0"); /* Last ditch */
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} else {
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node = OF_finddevice(cp);
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}
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if (node == -1)
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return (ENXIO);
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/*
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* Check old style of UART definition first. Unfortunately, the common
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* FDT processing is not possible if we have clock, power domains and
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* pinmux stuff.
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*/
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class = (struct uart_class *)uart_fdt_find_by_node(node, 0);
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if (class != NULL) {
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if ((err = uart_fdt_get_clock(node, &clk)) != 0)
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return (err);
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} else {
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/* Check class only linker set */
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class =
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(struct uart_class *)uart_fdt_find_by_node(node, 1);
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if (class == NULL)
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return (ENXIO);
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clk = 0;
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}
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/*
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* Retrieve serial attributes.
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*/
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if (uart_fdt_get_shift(node, &shift) != 0)
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shift = uart_getregshift(class);
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if (uart_fdt_get_io_width(node, &iowidth) != 0)
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iowidth = uart_getregiowidth(class);
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if (OF_getencprop(node, "current-speed", &br, sizeof(br)) <= 0)
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br = 0;
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err = OF_decode_addr(node, 0, bst, bsh, NULL);
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if (err != 0)
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return (err);
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*classp = class;
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*baud = br;
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*rclk = clk;
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*shiftp = shift;
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*iowidthp = iowidth;
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return (0);
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}
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static int
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uart_fdt_probe(device_t dev)
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{
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struct uart_softc *sc;
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phandle_t node;
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pcell_t clock, shift, iowidth;
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int err;
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sc = device_get_softc(dev);
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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sc->sc_class = (struct uart_class *)uart_fdt_find_device(dev);
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if (sc->sc_class == NULL)
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return (ENXIO);
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node = ofw_bus_get_node(dev);
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if ((err = uart_fdt_get_clock(node, &clock)) != 0)
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return (err);
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if (uart_fdt_get_shift(node, &shift) != 0)
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shift = uart_getregshift(sc->sc_class);
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if (uart_fdt_get_io_width(node, &iowidth) != 0)
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iowidth = uart_getregiowidth(sc->sc_class);
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return (uart_bus_probe(dev, (int)shift, (int)iowidth, (int)clock, 0, 0));
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}
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DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0);
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DRIVER_MODULE(uart, ofwbus, uart_fdt_driver, uart_devclass, 0, 0);
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