Merge Perforce changeset 219939 to head:
Start restructuring of altera_avgen(4) so that it can have an FDT attachment -- this requires first properly breaking out the current nexus attachment from the driver implementation. Sponsored by: DARPA, AFRL
This commit is contained in:
Robert Watson
parent
1aef4ac1bc
commit
86f4a437c9
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=245375
451
sys/dev/altera/avgen/altera_avgen_nexus.c
Normal file
451
sys/dev/altera/avgen/altera_avgen_nexus.c
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@ -0,0 +1,451 @@
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/*-
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* Copyright (c) 2012 Robert N. M. Watson
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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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#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/condvar.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/rman.h>
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#include <sys/stat.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <machine/vm.h>
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#include <vm/vm.h>
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#include <dev/altera/avgen/altera_avgen.h>
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/*
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* Generic device driver for allowing read(), write(), and mmap() on
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* memory-mapped, Avalon-attached devices. There is no actual dependence on
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* Avalon, so conceivably this should just be soc_dev or similar, since many
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* system-on-chip bus environments would work fine with the same code.
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*/
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static d_mmap_t altera_avgen_mmap;
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static d_read_t altera_avgen_read;
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static d_write_t altera_avgen_write;
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static struct cdevsw avg_cdevsw = {
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.d_version = D_VERSION,
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.d_mmap = altera_avgen_mmap,
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.d_read = altera_avgen_read,
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.d_write = altera_avgen_write,
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.d_name = "altera_avgen",
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};
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static int
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altera_avgen_read(struct cdev *dev, struct uio *uio, int flag)
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{
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struct altera_avgen_softc *sc;
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u_long offset, size;
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#ifdef NOTYET
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uint64_t v8;
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#endif
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uint32_t v4;
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uint16_t v2;
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uint8_t v1;
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u_int width;
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int error;
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sc = dev->si_drv1;
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if ((sc->avg_flags & ALTERA_AVALON_FLAG_READ) == 0)
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return (EACCES);
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width = sc->avg_width;
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if (uio->uio_offset < 0 || uio->uio_offset % width != 0 ||
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uio->uio_resid % width != 0)
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return (ENODEV);
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size = rman_get_size(sc->avg_res);
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if ((uio->uio_offset + uio->uio_resid < 0) ||
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(uio->uio_offset + uio->uio_resid > size))
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return (ENODEV);
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while (uio->uio_resid > 0) {
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offset = uio->uio_offset;
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if (offset + width > size)
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return (ENODEV);
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switch (width) {
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case 1:
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v1 = bus_read_1(sc->avg_res, offset);
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error = uiomove(&v1, sizeof(v1), uio);
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break;
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case 2:
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v2 = bus_read_2(sc->avg_res, offset);
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error = uiomove(&v2, sizeof(v2), uio);
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break;
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case 4:
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v4 = bus_read_4(sc->avg_res, offset);
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error = uiomove(&v4, sizeof(v4), uio);
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break;
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#ifdef NOTYET
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case 8:
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v8 = bus_read_8(sc->avg_res, offset);
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error = uiomove(&v8, sizeof(v8), uio);
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break;
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#endif
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default:
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panic("%s: unexpected widthment %u", __func__, width);
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}
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if (error)
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return (error);
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}
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return (0);
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}
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static int
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altera_avgen_write(struct cdev *dev, struct uio *uio, int flag)
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{
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struct altera_avgen_softc *sc;
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u_long offset, size;
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#ifdef NOTYET
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uint64_t v8;
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#endif
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uint32_t v4;
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uint16_t v2;
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uint8_t v1;
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u_int width;
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int error;
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sc = dev->si_drv1;
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if ((sc->avg_flags & ALTERA_AVALON_FLAG_WRITE) == 0)
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return (EACCES);
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width = sc->avg_width;
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if (uio->uio_offset < 0 || uio->uio_offset % width != 0 ||
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uio->uio_resid % width != 0)
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return (ENODEV);
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size = rman_get_size(sc->avg_res);
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while (uio->uio_resid > 0) {
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offset = uio->uio_offset;
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if (offset + width > size)
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return (ENODEV);
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switch (width) {
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case 1:
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error = uiomove(&v1, sizeof(v1), uio);
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if (error)
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return (error);
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bus_write_1(sc->avg_res, offset, v1);
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break;
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case 2:
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error = uiomove(&v2, sizeof(v2), uio);
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if (error)
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return (error);
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bus_write_2(sc->avg_res, offset, v2);
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break;
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case 4:
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error = uiomove(&v4, sizeof(v4), uio);
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if (error)
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return (error);
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bus_write_4(sc->avg_res, offset, v4);
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break;
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#ifdef NOTYET
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case 8:
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error = uiomove(&v8, sizeof(v8), uio);
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if (error)
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return (error);
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bus_write_8(sc->avg_res, offset, v8);
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break;
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#endif
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default:
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panic("%s: unexpected width %u", __func__, width);
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}
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}
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return (0);
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}
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static int
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altera_avgen_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
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int nprot, vm_memattr_t *memattr)
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{
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struct altera_avgen_softc *sc;
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sc = dev->si_drv1;
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if (nprot & VM_PROT_READ) {
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if ((sc->avg_flags & ALTERA_AVALON_FLAG_MMAP_READ) == 0)
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return (EACCES);
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}
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if (nprot & VM_PROT_WRITE) {
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if ((sc->avg_flags & ALTERA_AVALON_FLAG_MMAP_WRITE) == 0)
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return (EACCES);
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}
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if (nprot & VM_PROT_EXECUTE) {
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if ((sc->avg_flags & ALTERA_AVALON_FLAG_MMAP_EXEC) == 0)
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return (EACCES);
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}
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if (trunc_page(offset) == offset &&
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rman_get_size(sc->avg_res) >= offset + PAGE_SIZE) {
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*paddr = rman_get_start(sc->avg_res) + offset;
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*memattr = VM_MEMATTR_UNCACHEABLE;
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} else
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return (ENODEV);
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return (0);
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}
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static int
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altera_avgen_nexus_probe(device_t dev)
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{
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device_set_desc(dev, "Generic Altera Avalon device attachment");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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altera_avgen_process_options(struct altera_avgen_softc *sc,
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const char *str_fileio, const char *str_mmapio, const char *str_devname,
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int devunit)
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{
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const char *cp;
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device_t dev = sc->avg_dev;
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/*
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* Check for valid combinations of options.
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*/
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if (str_fileio == NULL && str_mmapio == NULL) {
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device_printf(dev,
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"at least one of %s or %s must be specified\n",
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ALTERA_AVALON_STR_FILEIO, ALTERA_AVALON_STR_MMAPIO);
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return (ENXIO);
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}
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if (str_devname == NULL && devunit != -1) {
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device_printf(dev, "%s requires %s be specified\n",
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ALTERA_AVALON_STR_DEVUNIT, ALTERA_AVALON_STR_DEVNAME);
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return (ENXIO);
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}
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/*
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* Extract, digest, and save values.
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*/
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switch (sc->avg_width) {
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case 1:
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case 2:
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case 4:
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#ifdef NOTYET
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case 8:
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#endif
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break;
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default:
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device_printf(dev, "%s unsupported value %u\n",
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ALTERA_AVALON_STR_WIDTH, sc->avg_width);
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return (ENXIO);
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}
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sc->avg_flags = 0;
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if (str_fileio != NULL) {
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for (cp = str_fileio; *cp != '\0'; cp++) {
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switch (*cp) {
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case ALTERA_AVALON_CHAR_READ:
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sc->avg_flags |= ALTERA_AVALON_FLAG_READ;
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break;
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case ALTERA_AVALON_CHAR_WRITE:
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sc->avg_flags |= ALTERA_AVALON_FLAG_WRITE;
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break;
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default:
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device_printf(dev,
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"invalid %s character %c\n",
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ALTERA_AVALON_STR_FILEIO, *cp);
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return (ENXIO);
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}
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}
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}
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if (str_mmapio != NULL) {
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for (cp = str_mmapio; *cp != '\0'; cp++) {
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switch (*cp) {
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case ALTERA_AVALON_CHAR_READ:
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sc->avg_flags |= ALTERA_AVALON_FLAG_MMAP_READ;
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break;
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case ALTERA_AVALON_CHAR_WRITE:
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sc->avg_flags |=
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ALTERA_AVALON_FLAG_MMAP_WRITE;
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break;
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case ALTERA_AVALON_CHAR_EXEC:
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sc->avg_flags |= ALTERA_AVALON_FLAG_MMAP_EXEC;
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break;
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default:
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device_printf(dev,
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"invalid %s character %c\n",
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ALTERA_AVALON_STR_MMAPIO, *cp);
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return (ENXIO);
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}
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}
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}
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return (0);
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}
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static int
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altera_avgen_nexus_attach(device_t dev)
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{
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struct altera_avgen_softc *sc;
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const char *str_fileio, *str_mmapio;
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const char *str_devname;
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char devname[SPECNAMELEN + 1];
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int devunit, error;
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sc = device_get_softc(dev);
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sc->avg_dev = dev;
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sc->avg_unit = device_get_unit(dev);
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/*
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* Query non-standard hints to find out what operations are permitted
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* on the device, and whether it is cached.
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*/
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str_fileio = NULL;
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str_mmapio = NULL;
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str_devname = NULL;
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devunit = -1;
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sc->avg_width = 1;
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error = resource_int_value(device_get_name(dev), device_get_unit(dev),
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ALTERA_AVALON_STR_WIDTH, &sc->avg_width);
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if (error != 0 && error != ENOENT) {
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device_printf(dev, "invalid %s\n", ALTERA_AVALON_STR_WIDTH);
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return (error);
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}
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(void)resource_string_value(device_get_name(dev),
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device_get_unit(dev), ALTERA_AVALON_STR_FILEIO, &str_fileio);
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(void)resource_string_value(device_get_name(dev),
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device_get_unit(dev), ALTERA_AVALON_STR_MMAPIO, &str_mmapio);
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(void)resource_string_value(device_get_name(dev),
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device_get_unit(dev), ALTERA_AVALON_STR_DEVNAME, &str_devname);
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(void)resource_int_value(device_get_name(dev), device_get_unit(dev),
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ALTERA_AVALON_STR_DEVUNIT, &devunit);
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error = altera_avgen_process_options(sc, str_fileio, str_mmapio,
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str_devname, devunit);
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if (error)
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return (error);
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/* Select a device name. */
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if (str_devname != NULL) {
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if (devunit != -1)
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(void)snprintf(devname, sizeof(devname), "%s%d",
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str_devname, devunit);
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else
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(void)snprintf(devname, sizeof(devname), "%s",
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str_devname);
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} else
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snprintf(devname, sizeof(devname), "%s%d", "avgen",
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sc->avg_unit);
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/* Memory allocation and checking. */
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sc->avg_rid = 0;
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sc->avg_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
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&sc->avg_rid, RF_ACTIVE);
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if (sc->avg_res == NULL) {
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device_printf(dev, "couldn't map memory\n");
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return (ENXIO);
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}
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if (rman_get_size(sc->avg_res) >= PAGE_SIZE || str_mmapio != NULL) {
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if (rman_get_size(sc->avg_res) % PAGE_SIZE != 0) {
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device_printf(dev,
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"memory region not even multiple of page size\n");
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error = ENXIO;
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goto error;
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}
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if (rman_get_start(sc->avg_res) % PAGE_SIZE != 0) {
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device_printf(dev, "memory region not page-aligned\n");
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error = ENXIO;
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goto error;
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}
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}
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/* Device node allocation. */
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if (str_devname == NULL) {
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str_devname = "altera_avgen%d";
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devunit = sc->avg_unit;
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}
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if (devunit != -1)
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sc->avg_cdev = make_dev(&avg_cdevsw, sc->avg_unit, UID_ROOT,
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GID_WHEEL, S_IRUSR | S_IWUSR, str_devname, devunit);
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else
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sc->avg_cdev = make_dev(&avg_cdevsw, sc->avg_unit, UID_ROOT,
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GID_WHEEL, S_IRUSR | S_IWUSR, str_devname);
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if (sc->avg_cdev == NULL) {
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device_printf(sc->avg_dev, "%s: make_dev failed\n", __func__);
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error = ENXIO;
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goto error;
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}
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/* XXXRW: Slight race between make_dev(9) and here. */
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sc->avg_cdev->si_drv1 = sc;
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return (0);
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error:
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bus_release_resource(dev, SYS_RES_MEMORY, sc->avg_rid, sc->avg_res);
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return (error);
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}
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static int
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altera_avgen_nexus_detach(device_t dev)
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{
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struct altera_avgen_softc *sc;
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sc = device_get_softc(dev);
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destroy_dev(sc->avg_cdev);
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bus_release_resource(dev, SYS_RES_MEMORY, sc->avg_rid, sc->avg_res);
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return (0);
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}
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static device_method_t altera_avgen_nexus_methods[] = {
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DEVMETHOD(device_probe, altera_avgen_nexus_probe),
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DEVMETHOD(device_attach, altera_avgen_nexus_attach),
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DEVMETHOD(device_detach, altera_avgen_nexus_detach),
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{ 0, 0 }
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};
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static driver_t altera_avgen_nexus_driver = {
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"altera_avgen",
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altera_avgen_nexus_methods,
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sizeof(struct altera_avgen_softc),
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};
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static devclass_t altera_avgen_devclass;
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DRIVER_MODULE(avgen, nexus, altera_avgen_nexus_driver, altera_avgen_devclass,
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0, 0);
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