Provide a character device allowing us to access BERI memory regions.
Sponsored by: DARPA, AFRL
This commit is contained in:
Ruslan Bukin
parent
4af184b9f7
commit
2d3f1b38a9
@ -22,4 +22,7 @@ arm/altera/socfpga/socfpga_mp.c optional smp
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dev/dwc/if_dwc.c optional dwc
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dev/mii/micphy.c optional micphy
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dev/mmc/host/dwmmc.c optional dwmmc
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# BERI specific
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dev/beri/beri_ring.c optional beri_ring
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dev/beri/beri_mem.c optional beri_mem
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@ -121,6 +121,7 @@ device spibus
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# BERI specific
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device beri_ring
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device beri_mem
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# Ethernet
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device ether
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@ -81,6 +81,12 @@
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};
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};
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beri_mem: mem@d0000000 {
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compatible = "sri-cambridge,beri-mem";
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reg = <0xd0000000 0x10000000>;
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status = "okay";
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};
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beri_debug: ring@c0000000 {
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compatible = "sri-cambridge,beri-ring";
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reg = <0xc0000000 0x3000>;
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186
sys/dev/beri/beri_mem.c
Normal file
186
sys/dev/beri/beri_mem.c
Normal file
@ -0,0 +1,186 @@
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/*-
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* Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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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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/*
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* BERI memory interface.
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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/kernel.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/rman.h>
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#include <sys/timeet.h>
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#include <sys/timetc.h>
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#include <sys/conf.h>
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#include <sys/uio.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.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 <machine/bus.h>
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#include <machine/fdt.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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struct beri_mem_softc {
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struct resource *res[1];
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struct cdev *mem_cdev;
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device_t dev;
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int mem_size;
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int mem_start;
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};
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static struct resource_spec beri_mem_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE },
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{ -1, 0 }
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};
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static int
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mem_open(struct cdev *dev, int flags __unused,
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int fmt __unused, struct thread *td __unused)
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{
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struct beri_mem_softc *sc;
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sc = dev->si_drv1;
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return (0);
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}
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static int
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mem_close(struct cdev *dev, int flags __unused,
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int fmt __unused, struct thread *td __unused)
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{
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struct beri_mem_softc *sc;
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sc = dev->si_drv1;
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return (0);
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}
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static int
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mem_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
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struct thread *td)
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{
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return (0);
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}
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static int
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mem_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
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vm_memattr_t *memattr)
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{
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struct beri_mem_softc *sc;
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sc = dev->si_drv1;
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if (offset < sc->mem_size) {
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*paddr = sc->mem_start + offset;
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return (0);
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}
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return (EINVAL);
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}
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static struct cdevsw mem_cdevsw = {
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.d_version = D_VERSION,
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.d_open = mem_open,
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.d_close = mem_close,
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.d_ioctl = mem_ioctl,
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.d_mmap = mem_mmap,
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.d_name = "BERI memory",
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};
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static int
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beri_mem_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_is_compatible(dev, "sri-cambridge,beri-mem"))
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return (ENXIO);
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device_set_desc(dev, "BERI memory");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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beri_mem_attach(device_t dev)
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{
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struct beri_mem_softc *sc;
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sc = device_get_softc(dev);
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sc->dev = dev;
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if (bus_alloc_resources(dev, beri_mem_spec, sc->res)) {
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device_printf(dev, "could not allocate resources\n");
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return (ENXIO);
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}
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/* Memory info */
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sc->mem_size = rman_get_size(sc->res[0]);
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sc->mem_start = rman_get_start(sc->res[0]);
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sc->mem_cdev = make_dev(&mem_cdevsw, 0, UID_ROOT, GID_WHEEL,
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0600, "beri_mem");
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if (sc->mem_cdev == NULL) {
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device_printf(dev, "Failed to create character device.\n");
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return (ENXIO);
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}
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sc->mem_cdev->si_drv1 = sc;
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return (0);
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}
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static device_method_t beri_mem_methods[] = {
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DEVMETHOD(device_probe, beri_mem_probe),
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DEVMETHOD(device_attach, beri_mem_attach),
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{ 0, 0 }
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};
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static driver_t beri_mem_driver = {
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"beri_mem",
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beri_mem_methods,
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sizeof(struct beri_mem_softc),
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};
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static devclass_t beri_mem_devclass;
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DRIVER_MODULE(beri_mem, simplebus, beri_mem_driver, beri_mem_devclass, 0, 0);
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