6495818590
strings as uart_bus_fdt's probe(). The bus code uses ofw_bus_search_compatible() and that's not an option in cpu (console) code -- it runs way before the ofw routines are usable. So the console probe has its own loop to search the table, but now at least there's only one table to be maintained when new devices are added.
201 lines
5.0 KiB
C
201 lines
5.0 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/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/systm.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/bus.h>
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#include <machine/fdt.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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/*
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* UART console routines.
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*/
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bus_space_tag_t uart_bus_space_io;
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bus_space_tag_t uart_bus_space_mem;
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static int
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uart_fdt_get_clock(phandle_t node, pcell_t *cell)
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{
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pcell_t clock;
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if ((OF_getprop(node, "clock-frequency", &clock,
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sizeof(clock))) <= 0)
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return (ENXIO);
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if (clock == 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_getprop(OF_parent(node), "bus-frequency", &clock,
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sizeof(clock))) <= 0)
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clock = 0;
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*cell = fdt32_to_cpu(clock);
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return (0);
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}
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static int
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uart_fdt_get_shift(phandle_t node, pcell_t *cell)
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{
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pcell_t shift;
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if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0)
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shift = 0;
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*cell = fdt32_to_cpu(shift);
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return (0);
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}
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int
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uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
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{
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if (b1->bst != b2->bst)
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return (0);
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if (pmap_kextract(b1->bsh) == 0)
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return (0);
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if (pmap_kextract(b2->bsh) == 0)
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return (0);
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return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 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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int
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uart_cpu_getdev(int devtype, struct uart_devinfo *di)
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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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const struct ofw_compat_data *cd;
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struct uart_class *class;
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phandle_t node, chosen;
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pcell_t shift, br, rclk;
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u_long start, size, pbase, psize;
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int err;
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uart_bus_space_mem = fdtbus_bs_tag;
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uart_bus_space_io = NULL;
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/* Allow overriding the FDT using the environment. */
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class = &uart_ns8250_class;
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err = uart_getenv(devtype, di, class);
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if (!err)
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return (0);
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if (devtype != UART_DEV_CONSOLE)
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return (ENXIO);
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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, &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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if (node == -1) /* Can't find anything */
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return (ENXIO);
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/*
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* Retrieve serial attributes.
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*/
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uart_fdt_get_shift(node, &shift);
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if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0)
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br = 0;
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br = fdt32_to_cpu(br);
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if ((err = uart_fdt_get_clock(node, &rclk)) != 0)
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return (err);
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/*
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* Finalize configuration.
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*/
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for (cd = uart_fdt_compat_data; cd->ocd_str != NULL; ++cd) {
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if (fdt_is_compatible(node, cd->ocd_str))
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break;
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}
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if (cd->ocd_str == NULL)
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return (ENXIO);
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class = (struct uart_class *)cd->ocd_data;
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di->bas.chan = 0;
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di->bas.regshft = (u_int)shift;
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di->baudrate = br;
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di->bas.rclk = (u_int)rclk;
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di->ops = uart_getops(class);
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di->databits = 8;
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di->stopbits = 1;
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di->parity = UART_PARITY_NONE;
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di->bas.bst = uart_bus_space_mem;
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err = fdt_regsize(node, &start, &size);
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if (err)
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return (ENXIO);
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err = fdt_get_range(OF_parent(node), 0, &pbase, &psize);
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if (err)
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pbase = 0;
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start += pbase;
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return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh));
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}
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