freebsd-nq/sys/dev/uart/uart_bus_fdt.c
Nathan Whitehorn dcd08302e5 Retire machine/fdt.h as a header used by MI code, as its function is now
obsolete. This involves the following pieces:
- Remove it entirely on PowerPC, where it is not used by MD code either
- Remove all references to machine/fdt.h in non-architecture-specific code
  (aside from uart_cpu_fdt.c, shared by ARM and MIPS, and so is somewhat
  non-arch-specific).
- Fix code relying on header pollution from machine/fdt.h includes
- Legacy fdtbus.c (still used on x86 FDT systems) now passes resource
  requests to its parent (nexus). This allows x86 FDT devices to allocate
  both memory and IO requests and removes the last notionally MI use of
  fdtbus_bs_tag.
- On those architectures that retain a machine/fdt.h, unused bits like
  FDT_MAP_IRQ and FDT_INTR_MAX have been removed.
2014-01-05 18:46:58 +00:00

151 lines
4.6 KiB
C

/*-
* 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 "opt_platform.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <machine/bus.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),
};
/*
* Compatible devices. Keep this sorted in most- to least-specific order first,
* alphabetical second. That is, "zwie,ns16550" should appear before "ns16550"
* on the theory that the zwie driver knows how to make better use of the
* hardware than the generic driver. Likewise with chips within a family, the
* highest-numbers / most recent models should probably appear earlier.
*/
static struct ofw_compat_data compat_data[] = {
{"arm,pl011", (uintptr_t)&uart_pl011_class},
{"cadence,uart", (uintptr_t)&uart_cdnc_class},
{"exynos", (uintptr_t)&uart_s3c2410_class},
{"fsl,imx6q-uart", (uintptr_t)&uart_imx_class},
{"fsl,imx53-uart", (uintptr_t)&uart_imx_class},
{"fsl,imx51-uart", (uintptr_t)&uart_imx_class},
{"fsl,imx31-uart", (uintptr_t)&uart_imx_class},
{"fsl,imx27-uart", (uintptr_t)&uart_imx_class},
{"fsl,imx25-uart", (uintptr_t)&uart_imx_class},
{"fsl,imx21-uart", (uintptr_t)&uart_imx_class},
{"fsl,mvf600-uart", (uintptr_t)&uart_vybrid_class},
{"lpc,uart", (uintptr_t)&uart_lpc_class},
{"ti,ns16550", (uintptr_t)&uart_ti8250_class},
{"ns16550", (uintptr_t)&uart_ns8250_class},
{NULL, (uintptr_t)NULL},
};
/* Export the compat_data table for use by the uart_cpu_fdt.c probe routine. */
const struct ofw_compat_data *uart_fdt_compat_data = compat_data;
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;
const struct ofw_compat_data * cd;
sc = device_get_softc(dev);
cd = ofw_bus_search_compatible(dev, compat_data);
if (cd->ocd_data == (uintptr_t)NULL)
return (ENXIO);
sc->sc_class = (struct uart_class *)cd->ocd_data;
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);