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author | rwatson <rwatson@FreeBSD.org> | 2013-01-13 14:38:09 +0000 |
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committer | rwatson <rwatson@FreeBSD.org> | 2013-01-13 14:38:09 +0000 |
commit | a6c6825b234352007e68fd40dcff69ebd1f960a1 (patch) | |
tree | 2178d489bd7a10e47cd9f208ddfdfd10810acc00 | |
parent | 6157d3ce336dcb3c28c81507cac6d3daae7d87ff (diff) | |
download | FreeBSD-src-a6c6825b234352007e68fd40dcff69ebd1f960a1.zip FreeBSD-src-a6c6825b234352007e68fd40dcff69ebd1f960a1.tar.gz |
Merge Perforce changeset 219917 to head:
Copy Altera JTAG UART nexus bus attachment as a starting point
for an FDT bus attachment.
Sponsored by: DARPA, AFRL
-rw-r--r-- | sys/dev/altera/jtag_uart/altera_jtag_uart_fdt.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/sys/dev/altera/jtag_uart/altera_jtag_uart_fdt.c b/sys/dev/altera/jtag_uart/altera_jtag_uart_fdt.c new file mode 100644 index 0000000..2592249 --- /dev/null +++ b/sys/dev/altera/jtag_uart/altera_jtag_uart_fdt.c @@ -0,0 +1,143 @@ +/*- + * 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); |