Author: raj
Date: Wed Jun 2 17:20:00 2010
New Revision: 208748
URL: http://svn.freebsd.org/changeset/base/208748
Log:
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
Added:
head/sys/dev/uart/uart_bus_fdt.c (contents, props changed)
Added: head/sys/dev/uart/uart_bus_fdt.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/dev/uart/uart_bus_fdt.c Wed Jun 2 17:20:00 2010
(r208748)
@@ -0,0 +1,200 @@
+/*-
+ * Copyright (c) 2009-2010 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Semihalf under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+
+#include <machine/bus.h>
+#include <machine/fdt.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/uart/uart.h>
+#include <dev/uart/uart_bus.h>
+#include <dev/uart/uart_cpu.h>
+
+static int uart_fdt_probe(device_t);
+
+static device_method_t uart_fdt_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, uart_fdt_probe),
+ DEVMETHOD(device_attach, uart_bus_attach),
+ DEVMETHOD(device_detach, uart_bus_detach),
+ { 0, 0 }
+};
+
+static driver_t uart_fdt_driver = {
+ uart_driver_name,
+ uart_fdt_methods,
+ sizeof(struct uart_softc),
+};
+
+static int
+uart_fdt_get_clock(phandle_t node, pcell_t *cell)
+{
+ pcell_t clock;
+
+ if ((OF_getprop(node, "clock-frequency", &clock,
+ sizeof(clock))) <= 0)
+ return (ENXIO);
+
+ if (clock == 0)
+ /* Try to retrieve parent 'bus-frequency' */
+ /* XXX this should go to simple-bus fixup or so */
+ if ((OF_getprop(OF_parent(node), "bus-frequency", &clock,
+ sizeof(clock))) <= 0)
+ clock = 0;
+
+ *cell = fdt32_to_cpu(clock);
+ return (0);
+}
+
+static int
+uart_fdt_get_shift(phandle_t node, pcell_t *cell)
+{
+ pcell_t shift;
+
+ if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0)
+ shift = 0;
+ *cell = fdt32_to_cpu(shift);
+ return (0);
+}
+
+static int
+uart_fdt_probe(device_t dev)
+{
+ struct uart_softc *sc;
+ phandle_t node;
+ pcell_t clock, shift;
+ int err;
+
+ if (!ofw_bus_is_compatible(dev, "ns16550"))
+ return (ENXIO);
+
+ sc = device_get_softc(dev);
+ sc->sc_class = &uart_ns8250_class;
+
+ node = ofw_bus_get_node(dev);
+
+ if ((err = uart_fdt_get_clock(node, &clock)) != 0)
+ return (err);
+ uart_fdt_get_shift(node, &shift);
+
+ return (uart_bus_probe(dev, (int)shift, (int)clock, 0, 0));
+}
+
+DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0);
+
+/*
+ * UART console routines.
+ */
+bus_space_tag_t uart_bus_space_io;
+bus_space_tag_t uart_bus_space_mem;
+
+int
+uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
+{
+
+ return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
+}
+
+int
+uart_cpu_getdev(int devtype, struct uart_devinfo *di)
+{
+ char buf[64];
+ struct uart_class *class;
+ phandle_t node, chosen;
+ pcell_t shift, br, rclk;
+ u_long start, size;
+ int err;
+
+ if (devtype != UART_DEV_CONSOLE)
+ return (ENXIO);
+
+ /*
+ * Retrieve /chosen/std{in,out}.
+ */
+ if ((chosen = OF_finddevice("/chosen")) == 0)
+ return (ENXIO);
+ if (OF_getprop(chosen, "stdin", buf, sizeof(buf)) <= 0)
+ return (ENXIO);
+ if ((node = OF_finddevice(buf)) == 0)
+ return (ENXIO);
+ if (OF_getprop(chosen, "stdout", buf, sizeof(buf)) <= 0)
+ return (ENXIO);
+ if (OF_finddevice(buf) != node)
+ /* Only stdin == stdout is supported. */
+ return (ENXIO);
+ /*
+ * Retrieve serial attributes.
+ */
+ uart_fdt_get_shift(node, &shift);
+
+ if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0)
+ br = 0;
+ br = fdt32_to_cpu(br);
+
+ if ((err = uart_fdt_get_clock(node, &rclk)) != 0)
+ return (err);
+ /*
+ * Finalize configuration.
+ */
+ class = &uart_quicc_class;
+ if (fdt_is_compatible(node, "ns16550"))
+ class = &uart_ns8250_class;
+
+ di->bas.chan = 0;
+ di->bas.regshft = (u_int)shift;
+ di->baudrate = 0;
+ di->bas.rclk = (u_int)rclk;
+ di->ops = uart_getops(class);
+ di->databits = 8;
+ di->stopbits = 1;
+ di->parity = UART_PARITY_NONE;
+ di->bas.bst = fdtbus_bs_tag;
+
+ err = fdt_regsize(node, &start, &size);
+ if (err)
+ return (ENXIO);
+ start += FDT_IMMR_VA;
+
+ uart_bus_space_mem = fdtbus_bs_tag;
+ uart_bus_space_io = NULL;
+
+ if (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh) != 0)
+ return (ENXIO);
+
+ return (0);
+}
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