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Merge Perforce changeset 219917 to head:

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Copy Altera JTAG UART nexus bus attachment as a starting point
  for an FDT bus attachment.

Sponsored by: DARPA, AFRL
This commit is contained in:
Robert Watson 2013-01-13 14:38:09 +00:00
parent b99586c25f
commit 9d995792df
1 changed files with 143 additions and 0 deletions
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143
sys/dev/altera/jtag_uart/altera_jtag_uart_fdt.c Normal file
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/*-
* Copyright (c) 2012 Robert N. M. Watson
* All rights reserved.
*
* This software was developed by SRI International and the University of
* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
* ("CTSRD"), as part of the DARPA CRASH research programme.
*
* 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/condvar.h>
#include <sys/conf.h>
#include <sys/bio.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <sys/systm.h>
#include <sys/taskqueue.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <geom/geom_disk.h>
#include <dev/altera/jtag_uart/altera_jtag_uart.h>
/*
* Nexus bus attachment for Altera JTAG UARTs. Appropriate for most Altera
* FPGA SoC-style configurations in which the IP core will be exposed to the
* processor via a memory-mapped Avalon bus.
*/
static int
altera_jtag_uart_nexus_probe(device_t dev)
{
device_set_desc(dev, "Altera JTAG UART");
return (BUS_PROBE_DEFAULT);
}
static int
altera_jtag_uart_nexus_attach(device_t dev)
{
struct altera_jtag_uart_softc *sc;
int error;
error = 0;
sc = device_get_softc(dev);
sc->ajus_dev = dev;
sc->ajus_unit = device_get_unit(dev);
sc->ajus_mem_rid = 0;
sc->ajus_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
&sc->ajus_mem_rid, RF_ACTIVE);
if (sc->ajus_mem_res == NULL) {
device_printf(dev, "couldn't map memory\n");
error = ENXIO;
goto out;
}
/*
* Interrupt support is optional -- if we can't allocate an IRQ, then
* we fall back on polling.
*/
sc->ajus_irq_rid = 0;
sc->ajus_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
&sc->ajus_irq_rid, RF_ACTIVE | RF_SHAREABLE);
if (sc->ajus_irq_res == NULL)
device_printf(dev,
"IRQ unavailable; selecting polled operation\n");
error = altera_jtag_uart_attach(sc);
out:
if (error) {
if (sc->ajus_irq_res != NULL)
bus_release_resource(dev, SYS_RES_IRQ,
sc->ajus_irq_rid, sc->ajus_irq_res);
if (sc->ajus_mem_res != NULL)
bus_release_resource(dev, SYS_RES_MEMORY,
sc->ajus_mem_rid, sc->ajus_mem_res);
}
return (error);
}
static int
altera_jtag_uart_nexus_detach(device_t dev)
{
struct altera_jtag_uart_softc *sc;
sc = device_get_softc(dev);
KASSERT(sc->ajus_mem_res != NULL, ("%s: resources not allocated",
__func__));
altera_jtag_uart_detach(sc);
bus_release_resource(dev, SYS_RES_IRQ, sc->ajus_irq_rid,
sc->ajus_irq_res);
bus_release_resource(dev, SYS_RES_MEMORY, sc->ajus_mem_rid,
sc->ajus_mem_res);
return (0);
}
static device_method_t altera_jtag_uart_nexus_methods[] = {
DEVMETHOD(device_probe, altera_jtag_uart_nexus_probe),
DEVMETHOD(device_attach, altera_jtag_uart_nexus_attach),
DEVMETHOD(device_detach, altera_jtag_uart_nexus_detach),
{ 0, 0 }
};
static driver_t altera_jtag_uart_nexus_driver = {
"altera_jtag_uart",
altera_jtag_uart_nexus_methods,
sizeof(struct altera_jtag_uart_softc),
};
static devclass_t altera_jtag_uart_devclass;
DRIVER_MODULE(altera_jtag_uart, nexus, altera_jtag_uart_nexus_driver,
altera_jtag_uart_devclass, 0, 0);