diff options
author | rwatson <rwatson@FreeBSD.org> | 2012-08-25 11:07:43 +0000 |
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committer | rwatson <rwatson@FreeBSD.org> | 2012-08-25 11:07:43 +0000 |
commit | 57bdf1f3160c3bad78968872120cea0e37a94bf1 (patch) | |
tree | e0ce5c060681a6450bf378f148e6dc9425f67f7b /sys/dev/altera | |
parent | d5129fde3c8f2b0e1d85049892dbcc47bd1be041 (diff) | |
download | FreeBSD-src-57bdf1f3160c3bad78968872120cea0e37a94bf1.zip FreeBSD-src-57bdf1f3160c3bad78968872120cea0e37a94bf1.tar.gz |
Add altera_avgen(4), a generic device driver to be used by hard and soft
CPU cores on Altera FPGAs. The device driver allows memory-mapped devices
on Altera's Avalon SoC bus to be exported to userspace via device nodes.
device.hints directories dictate device name, permissible access methods,
physical address and length, and I/O alignment. Devices can be accessed
using read(2)/write(2), but also memory mapped in userspace using mmap(2).
Devices attach directly to the Nexus, as is common for embedded device
drivers; in the future something more mature might be desirable. There is
currently no facility to support directing device-originated interrupts to
userspace.
In the future, this device driver may be renamed to socgen(4), as it can
in principle also be used with other system-on-chip (SoC) busses, such as
Axi on ASICs and FPGAs. However, we have only tested it on Avalon busses
with memory-mapped ROMs, frame buffers, etc.
Sponsored by: DARPA, AFRL
Diffstat (limited to 'sys/dev/altera')
-rw-r--r-- | sys/dev/altera/avgen/altera_avgen.c | 451 | ||||
-rw-r--r-- | sys/dev/altera/avgen/altera_avgen.h | 83 |
2 files changed, 534 insertions, 0 deletions
diff --git a/sys/dev/altera/avgen/altera_avgen.c b/sys/dev/altera/avgen/altera_avgen.c new file mode 100644 index 0000000..a90b546 --- /dev/null +++ b/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); diff --git a/sys/dev/altera/avgen/altera_avgen.h b/sys/dev/altera/avgen/altera_avgen.h new file mode 100644 index 0000000..c8c7947 --- /dev/null +++ b/sys/dev/altera/avgen/altera_avgen.h @@ -0,0 +1,83 @@ +/*- + * 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. + * + * $FreeBSD$ + */ + +#ifndef _DEV_ALTERA_AVALON_H_ +#define _DEV_ALTERA_AVALON_H_ + +struct altera_avgen_softc { + /* + * Bus-related fields. + */ + device_t avg_dev; + int avg_unit; + + /* + * The device node and memory-mapped I/O region. + */ + struct cdev *avg_cdev; + struct resource *avg_res; + int avg_rid; + + /* + * Access properties configured by device.hints. + */ + u_int avg_flags; + u_int avg_width; +}; + +/* + * Various flags extracted from device.hints to configure operations on the + * device. + */ +#define ALTERA_AVALON_FLAG_READ 0x01 +#define ALTERA_AVALON_FLAG_WRITE 0x02 +#define ALTERA_AVALON_FLAG_MMAP_READ 0x04 +#define ALTERA_AVALON_FLAG_MMAP_WRITE 0x08 +#define ALTERA_AVALON_FLAG_MMAP_EXEC 0x10 + +#define ALTERA_AVALON_CHAR_READ 'r' +#define ALTERA_AVALON_CHAR_WRITE 'w' +#define ALTERA_AVALON_CHAR_EXEC 'x' + +#define ALTERA_AVALON_STR_WIDTH "width" +#define ALTERA_AVALON_STR_FILEIO "fileio" +#define ALTERA_AVALON_STR_MMAPIO "mmapio" +#define ALTERA_AVALON_STR_DEVNAME "devname" +#define ALTERA_AVALON_STR_DEVUNIT "devunit" + +/* + * Driver setup routines from the bus attachment/teardown. + */ +int altera_avgen_attach(struct altera_avgen_softc *sc); +void altera_avgen_detach(struct altera_avgen_softc *sc); + +#endif /* _DEV_ALTERA_AVALON_H_ */ |