259 lines
6.5 KiB
C
259 lines
6.5 KiB
C
/*-
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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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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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if (OF_getprop(chosen, name, buf, sizeof(buf)) <= 0)
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return (ENXIO);
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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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{
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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;
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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 (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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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;
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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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return (uart_bus_probe(dev, (int)shift, (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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