d382695820
not only means that it's possible (though unlikely) that we hand out
differing tags for the same bus space, it also means that the tags
we handed out are not used during bus enumeration. Both affect our
ability to compare tags. Fix the first by initializing our tags only
once. Fix the second by testing if one of the tags to compare is our
tag and the other is a busspace_isa_{io|mem} tag and declare them
equal if so.
This fixes using uart(4) as the serial console on a ds10. That is,
the low-level console worked, but we could not match the resources
to one of the UARTs found during bus enumeration, which prevented
uart(4) from becoming the console in single- or multi-user mode.
Approved by: re (kensmith)
MFC after: 2 days
Thanks to: all involved in getting a ds10 to me; directly or indirectly.
Special thanks to: Dave Knight, ISC (for not scratching my Porsche :-)
143 lines
4.1 KiB
C
143 lines
4.1 KiB
C
/*-
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* Copyright (c) 2003, 2004 Marcel Moolenaar
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* All rights reserved.
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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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*
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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/reboot.h>
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#include <machine/bus.h>
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#include <machine/md_var.h>
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#include <machine/rpb.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_cpu.h>
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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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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->bsh != b2->bsh)
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return (0);
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if (b1->bst == b2->bst)
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return (1);
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/* Chipset drivers can have redefined the ISA tags. Deal with it. */
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if ((b1->bst == uart_bus_space_io && b2->bst == busspace_isa_io) ||
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(b1->bst == busspace_isa_io && b2->bst == uart_bus_space_io))
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return (1);
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if ((b1->bst == uart_bus_space_mem && b2->bst == busspace_isa_mem) ||
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(b1->bst == busspace_isa_mem && b2->bst == uart_bus_space_mem))
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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_cpu_getdev(int devtype, struct uart_devinfo *di)
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{
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static int init = 0;
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struct ctb *ctb;
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unsigned int i, ivar;
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if (!init) {
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uart_bus_space_io = busspace_isa_io;
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uart_bus_space_mem = busspace_isa_mem;
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init = 1;
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}
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if (devtype == UART_DEV_CONSOLE) {
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ctb = (struct ctb *)(((caddr_t)hwrpb) + hwrpb->rpb_ctb_off);
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if (ctb->ctb_term_type != CTB_PRINTERPORT)
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return (ENXIO);
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boothowto |= RB_SERIAL;
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di->ops = uart_ns8250_ops;
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di->bas.chan = 0;
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di->bas.bst = uart_bus_space_io;
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if (bus_space_map(di->bas.bst, 0x3f8, 8, 0, &di->bas.bsh) != 0)
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return (ENXIO);
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di->bas.regshft = 0;
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di->bas.rclk = 0;
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di->baudrate = 9600;
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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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return (0);
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}
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/* Check the environment. */
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if (uart_getenv(devtype, di) == 0)
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return (0);
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/*
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* Scan the hints. We only try units 0 to 3 (inclusive). This
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* covers the ISA legacy where 4 UARTs had their resources
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* predefined.
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*/
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for (i = 0; i < 4; i++) {
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if (resource_int_value("uart", i, "flags", &ivar))
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continue;
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if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
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continue;
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/*
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* We have a possible device. Make sure it's enabled and
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* that we have an I/O port.
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*/
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if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
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ivar != 0)
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continue;
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if (resource_int_value("uart", i, "port", &ivar) != 0 ||
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ivar == 0)
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continue;
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/*
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* Got it. Fill in the instance and return it. We assume we
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* only have ns8250 and successors on alpha.
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*/
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di->ops = uart_ns8250_ops;
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di->bas.chan = 0;
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di->bas.bst = uart_bus_space_io;
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if (bus_space_map(di->bas.bst, ivar, 8, 0, &di->bas.bsh) != 0)
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continue;
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di->bas.regshft = 0;
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di->bas.rclk = 0;
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if (resource_int_value("uart", i, "baud", &ivar) != 0)
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ivar = 0;
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di->baudrate = ivar;
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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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return (0);
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}
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return (ENXIO);
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}
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