svn commit: r245375 - head/sys/dev/altera/avgen
Robert Watson
rwatson at FreeBSD.org
Sun Jan 13 16:41:26 UTC 2013
Author: rwatson
Date: Sun Jan 13 16:41:25 2013
New Revision: 245375
URL: http://svnweb.freebsd.org/changeset/base/245375
Log:
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
Added:
head/sys/dev/altera/avgen/altera_avgen_nexus.c
- copied unchanged from r245363, head/sys/dev/altera/avgen/altera_avgen.c
Copied: head/sys/dev/altera/avgen/altera_avgen_nexus.c (from r245363, head/sys/dev/altera/avgen/altera_avgen.c)
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/dev/altera/avgen/altera_avgen_nexus.c Sun Jan 13 16:41:25 2013 (r245375, copy of r245363, head/sys/dev/altera/avgen/altera_avgen.c)
@@ -0,0 +1,451 @@
+/*-
+ * 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/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/rman.h>
+#include <sys/stat.h>
+#include <sys/systm.h>
+#include <sys/uio.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+#include <machine/vm.h>
+
+#include <vm/vm.h>
+
+#include <dev/altera/avgen/altera_avgen.h>
+
+/*
+ * Generic device driver for allowing read(), write(), and mmap() on
+ * memory-mapped, Avalon-attached devices. There is no actual dependence on
+ * Avalon, so conceivably this should just be soc_dev or similar, since many
+ * system-on-chip bus environments would work fine with the same code.
+ */
+
+static d_mmap_t altera_avgen_mmap;
+static d_read_t altera_avgen_read;
+static d_write_t altera_avgen_write;
+
+static struct cdevsw avg_cdevsw = {
+ .d_version = D_VERSION,
+ .d_mmap = altera_avgen_mmap,
+ .d_read = altera_avgen_read,
+ .d_write = altera_avgen_write,
+ .d_name = "altera_avgen",
+};
+
+static int
+altera_avgen_read(struct cdev *dev, struct uio *uio, int flag)
+{
+ struct altera_avgen_softc *sc;
+ u_long offset, size;
+#ifdef NOTYET
+ uint64_t v8;
+#endif
+ uint32_t v4;
+ uint16_t v2;
+ uint8_t v1;
+ u_int width;
+ int error;
+
+ sc = dev->si_drv1;
+ if ((sc->avg_flags & ALTERA_AVALON_FLAG_READ) == 0)
+ return (EACCES);
+ width = sc->avg_width;
+ if (uio->uio_offset < 0 || uio->uio_offset % width != 0 ||
+ uio->uio_resid % width != 0)
+ return (ENODEV);
+ size = rman_get_size(sc->avg_res);
+ if ((uio->uio_offset + uio->uio_resid < 0) ||
+ (uio->uio_offset + uio->uio_resid > size))
+ return (ENODEV);
+ while (uio->uio_resid > 0) {
+ offset = uio->uio_offset;
+ if (offset + width > size)
+ return (ENODEV);
+ switch (width) {
+ case 1:
+ v1 = bus_read_1(sc->avg_res, offset);
+ error = uiomove(&v1, sizeof(v1), uio);
+ break;
+
+ case 2:
+ v2 = bus_read_2(sc->avg_res, offset);
+ error = uiomove(&v2, sizeof(v2), uio);
+ break;
+
+ case 4:
+ v4 = bus_read_4(sc->avg_res, offset);
+ error = uiomove(&v4, sizeof(v4), uio);
+ break;
+
+#ifdef NOTYET
+ case 8:
+ v8 = bus_read_8(sc->avg_res, offset);
+ error = uiomove(&v8, sizeof(v8), uio);
+ break;
+
+#endif
+
+ default:
+ panic("%s: unexpected widthment %u", __func__, width);
+ }
+ if (error)
+ return (error);
+ }
+ return (0);
+}
+
+static int
+altera_avgen_write(struct cdev *dev, struct uio *uio, int flag)
+{
+ struct altera_avgen_softc *sc;
+ u_long offset, size;
+#ifdef NOTYET
+ uint64_t v8;
+#endif
+ uint32_t v4;
+ uint16_t v2;
+ uint8_t v1;
+ u_int width;
+ int error;
+
+ sc = dev->si_drv1;
+ if ((sc->avg_flags & ALTERA_AVALON_FLAG_WRITE) == 0)
+ return (EACCES);
+ width = sc->avg_width;
+ if (uio->uio_offset < 0 || uio->uio_offset % width != 0 ||
+ uio->uio_resid % width != 0)
+ return (ENODEV);
+ size = rman_get_size(sc->avg_res);
+ while (uio->uio_resid > 0) {
+ offset = uio->uio_offset;
+ if (offset + width > size)
+ return (ENODEV);
+ switch (width) {
+ case 1:
+ error = uiomove(&v1, sizeof(v1), uio);
+ if (error)
+ return (error);
+ bus_write_1(sc->avg_res, offset, v1);
+ break;
+
+ case 2:
+ error = uiomove(&v2, sizeof(v2), uio);
+ if (error)
+ return (error);
+ bus_write_2(sc->avg_res, offset, v2);
+ break;
+
+ case 4:
+ error = uiomove(&v4, sizeof(v4), uio);
+ if (error)
+ return (error);
+ bus_write_4(sc->avg_res, offset, v4);
+ break;
+
+#ifdef NOTYET
+ case 8:
+ error = uiomove(&v8, sizeof(v8), uio);
+ if (error)
+ return (error);
+ bus_write_8(sc->avg_res, offset, v8);
+ break;
+#endif
+
+ default:
+ panic("%s: unexpected width %u", __func__, width);
+ }
+ }
+ return (0);
+}
+
+static int
+altera_avgen_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
+ int nprot, vm_memattr_t *memattr)
+{
+ struct altera_avgen_softc *sc;
+
+ sc = dev->si_drv1;
+ if (nprot & VM_PROT_READ) {
+ if ((sc->avg_flags & ALTERA_AVALON_FLAG_MMAP_READ) == 0)
+ return (EACCES);
+ }
+ if (nprot & VM_PROT_WRITE) {
+ if ((sc->avg_flags & ALTERA_AVALON_FLAG_MMAP_WRITE) == 0)
+ return (EACCES);
+ }
+ if (nprot & VM_PROT_EXECUTE) {
+ if ((sc->avg_flags & ALTERA_AVALON_FLAG_MMAP_EXEC) == 0)
+ return (EACCES);
+ }
+ if (trunc_page(offset) == offset &&
+ rman_get_size(sc->avg_res) >= offset + PAGE_SIZE) {
+ *paddr = rman_get_start(sc->avg_res) + offset;
+ *memattr = VM_MEMATTR_UNCACHEABLE;
+ } else
+ return (ENODEV);
+ return (0);
+}
+
+static int
+altera_avgen_nexus_probe(device_t dev)
+{
+
+ device_set_desc(dev, "Generic Altera Avalon device attachment");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+altera_avgen_process_options(struct altera_avgen_softc *sc,
+ const char *str_fileio, const char *str_mmapio, const char *str_devname,
+ int devunit)
+{
+ const char *cp;
+ device_t dev = sc->avg_dev;
+
+ /*
+ * Check for valid combinations of options.
+ */
+ if (str_fileio == NULL && str_mmapio == NULL) {
+ device_printf(dev,
+ "at least one of %s or %s must be specified\n",
+ ALTERA_AVALON_STR_FILEIO, ALTERA_AVALON_STR_MMAPIO);
+ return (ENXIO);
+ }
+ if (str_devname == NULL && devunit != -1) {
+ device_printf(dev, "%s requires %s be specified\n",
+ ALTERA_AVALON_STR_DEVUNIT, ALTERA_AVALON_STR_DEVNAME);
+ return (ENXIO);
+ }
+
+ /*
+ * Extract, digest, and save values.
+ */
+ switch (sc->avg_width) {
+ case 1:
+ case 2:
+ case 4:
+#ifdef NOTYET
+ case 8:
+#endif
+ break;
+
+ default:
+ device_printf(dev, "%s unsupported value %u\n",
+ ALTERA_AVALON_STR_WIDTH, sc->avg_width);
+ return (ENXIO);
+ }
+ sc->avg_flags = 0;
+ if (str_fileio != NULL) {
+ for (cp = str_fileio; *cp != '\0'; cp++) {
+ switch (*cp) {
+ case ALTERA_AVALON_CHAR_READ:
+ sc->avg_flags |= ALTERA_AVALON_FLAG_READ;
+ break;
+
+ case ALTERA_AVALON_CHAR_WRITE:
+ sc->avg_flags |= ALTERA_AVALON_FLAG_WRITE;
+ break;
+
+ default:
+ device_printf(dev,
+ "invalid %s character %c\n",
+ ALTERA_AVALON_STR_FILEIO, *cp);
+ return (ENXIO);
+ }
+ }
+ }
+ if (str_mmapio != NULL) {
+ for (cp = str_mmapio; *cp != '\0'; cp++) {
+ switch (*cp) {
+ case ALTERA_AVALON_CHAR_READ:
+ sc->avg_flags |= ALTERA_AVALON_FLAG_MMAP_READ;
+ break;
+
+ case ALTERA_AVALON_CHAR_WRITE:
+ sc->avg_flags |=
+ ALTERA_AVALON_FLAG_MMAP_WRITE;
+ break;
+
+ case ALTERA_AVALON_CHAR_EXEC:
+ sc->avg_flags |= ALTERA_AVALON_FLAG_MMAP_EXEC;
+ break;
+
+ default:
+ device_printf(dev,
+ "invalid %s character %c\n",
+ ALTERA_AVALON_STR_MMAPIO, *cp);
+ return (ENXIO);
+ }
+ }
+ }
+ return (0);
+}
+
+static int
+altera_avgen_nexus_attach(device_t dev)
+{
+ struct altera_avgen_softc *sc;
+ const char *str_fileio, *str_mmapio;
+ const char *str_devname;
+ char devname[SPECNAMELEN + 1];
+ int devunit, error;
+
+ sc = device_get_softc(dev);
+ sc->avg_dev = dev;
+ sc->avg_unit = device_get_unit(dev);
+
+ /*
+ * Query non-standard hints to find out what operations are permitted
+ * on the device, and whether it is cached.
+ */
+ str_fileio = NULL;
+ str_mmapio = NULL;
+ str_devname = NULL;
+ devunit = -1;
+ sc->avg_width = 1;
+ error = resource_int_value(device_get_name(dev), device_get_unit(dev),
+ ALTERA_AVALON_STR_WIDTH, &sc->avg_width);
+ if (error != 0 && error != ENOENT) {
+ device_printf(dev, "invalid %s\n", ALTERA_AVALON_STR_WIDTH);
+ return (error);
+ }
+ (void)resource_string_value(device_get_name(dev),
+ device_get_unit(dev), ALTERA_AVALON_STR_FILEIO, &str_fileio);
+ (void)resource_string_value(device_get_name(dev),
+ device_get_unit(dev), ALTERA_AVALON_STR_MMAPIO, &str_mmapio);
+ (void)resource_string_value(device_get_name(dev),
+ device_get_unit(dev), ALTERA_AVALON_STR_DEVNAME, &str_devname);
+ (void)resource_int_value(device_get_name(dev), device_get_unit(dev),
+ ALTERA_AVALON_STR_DEVUNIT, &devunit);
+ error = altera_avgen_process_options(sc, str_fileio, str_mmapio,
+ str_devname, devunit);
+ if (error)
+ return (error);
+
+ /* Select a device name. */
+ if (str_devname != NULL) {
+ if (devunit != -1)
+ (void)snprintf(devname, sizeof(devname), "%s%d",
+ str_devname, devunit);
+ else
+ (void)snprintf(devname, sizeof(devname), "%s",
+ str_devname);
+ } else
+ snprintf(devname, sizeof(devname), "%s%d", "avgen",
+ sc->avg_unit);
+
+ /* Memory allocation and checking. */
+ sc->avg_rid = 0;
+ sc->avg_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
+ &sc->avg_rid, RF_ACTIVE);
+ if (sc->avg_res == NULL) {
+ device_printf(dev, "couldn't map memory\n");
+ return (ENXIO);
+ }
+ if (rman_get_size(sc->avg_res) >= PAGE_SIZE || str_mmapio != NULL) {
+ if (rman_get_size(sc->avg_res) % PAGE_SIZE != 0) {
+ device_printf(dev,
+ "memory region not even multiple of page size\n");
+ error = ENXIO;
+ goto error;
+ }
+ if (rman_get_start(sc->avg_res) % PAGE_SIZE != 0) {
+ device_printf(dev, "memory region not page-aligned\n");
+ error = ENXIO;
+ goto error;
+ }
+ }
+
+ /* Device node allocation. */
+ if (str_devname == NULL) {
+ str_devname = "altera_avgen%d";
+ devunit = sc->avg_unit;
+ }
+ if (devunit != -1)
+ sc->avg_cdev = make_dev(&avg_cdevsw, sc->avg_unit, UID_ROOT,
+ GID_WHEEL, S_IRUSR | S_IWUSR, str_devname, devunit);
+ else
+ sc->avg_cdev = make_dev(&avg_cdevsw, sc->avg_unit, UID_ROOT,
+ GID_WHEEL, S_IRUSR | S_IWUSR, str_devname);
+ if (sc->avg_cdev == NULL) {
+ device_printf(sc->avg_dev, "%s: make_dev failed\n", __func__);
+ error = ENXIO;
+ goto error;
+ }
+ /* XXXRW: Slight race between make_dev(9) and here. */
+ sc->avg_cdev->si_drv1 = sc;
+ return (0);
+
+error:
+ bus_release_resource(dev, SYS_RES_MEMORY, sc->avg_rid, sc->avg_res);
+ return (error);
+}
+
+static int
+altera_avgen_nexus_detach(device_t dev)
+{
+ struct altera_avgen_softc *sc;
+
+ sc = device_get_softc(dev);
+ destroy_dev(sc->avg_cdev);
+ bus_release_resource(dev, SYS_RES_MEMORY, sc->avg_rid, sc->avg_res);
+ return (0);
+}
+
+static device_method_t altera_avgen_nexus_methods[] = {
+ DEVMETHOD(device_probe, altera_avgen_nexus_probe),
+ DEVMETHOD(device_attach, altera_avgen_nexus_attach),
+ DEVMETHOD(device_detach, altera_avgen_nexus_detach),
+ { 0, 0 }
+};
+
+static driver_t altera_avgen_nexus_driver = {
+ "altera_avgen",
+ altera_avgen_nexus_methods,
+ sizeof(struct altera_avgen_softc),
+};
+
+static devclass_t altera_avgen_devclass;
+
+DRIVER_MODULE(avgen, nexus, altera_avgen_nexus_driver, altera_avgen_devclass,
+ 0, 0);
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