FDT (simplebus) compatible attachment for uart(4).
This will be a single uart(4) attachment code shared by all FDT-enabled platforms. Reviewed by: imp Sponsored by: The FreeBSD Foundation
This commit is contained in:
Rafal Jaworowski
parent
58158742f2
commit
b618dad3c2
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=208748
200
sys/dev/uart/uart_bus_fdt.c
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sys/dev/uart/uart_bus_fdt.c
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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 <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 <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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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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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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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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if (!ofw_bus_is_compatible(dev, "ns16550"))
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return (ENXIO);
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sc = device_get_softc(dev);
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sc->sc_class = &uart_ns8250_class;
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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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uart_fdt_get_shift(node, &shift);
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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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/*
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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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int
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uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
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{
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return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 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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char buf[64];
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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;
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int err;
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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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if ((chosen = OF_finddevice("/chosen")) == 0)
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return (ENXIO);
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if (OF_getprop(chosen, "stdin", buf, sizeof(buf)) <= 0)
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return (ENXIO);
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if ((node = OF_finddevice(buf)) == 0)
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return (ENXIO);
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if (OF_getprop(chosen, "stdout", buf, sizeof(buf)) <= 0)
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return (ENXIO);
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if (OF_finddevice(buf) != node)
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/* Only stdin == stdout is supported. */
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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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class = &uart_quicc_class;
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if (fdt_is_compatible(node, "ns16550"))
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class = &uart_ns8250_class;
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di->bas.chan = 0;
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di->bas.regshft = (u_int)shift;
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di->baudrate = 0;
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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 = fdtbus_bs_tag;
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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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start += FDT_IMMR_VA;
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uart_bus_space_mem = fdtbus_bs_tag;
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uart_bus_space_io = NULL;
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if (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh) != 0)
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return (ENXIO);
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return (0);
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}
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