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-rw-r--r--sys/riscv/htif/htif.c284
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diff --git a/sys/riscv/htif/htif.c b/sys/riscv/htif/htif.c
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+++ b/sys/riscv/htif/htif.c
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+/*-
+ * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
+ * All rights reserved.
+ *
+ * Portions of this software were 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.
+ *
+ * Portions of this software were developed by the University of Cambridge
+ * Computer Laboratory as part of the CTSRD Project, with support from the
+ * UK Higher Education Innovation Fund (HEIF).
+ *
+ * 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/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/rman.h>
+#include <sys/pcpu.h>
+#include <sys/proc.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <machine/bus.h>
+#include <machine/cpu.h>
+#include <machine/intr.h>
+#include <machine/asm.h>
+#include <machine/trap.h>
+#include <machine/vmparam.h>
+
+#include "htif.h"
+
+static struct resource_spec htif_spec[] = {
+ { SYS_RES_IRQ, 0, RF_ACTIVE },
+ { -1, 0 }
+};
+
+struct intr_entry {
+ void (*func) (void *, uint64_t);
+ void *arg;
+};
+
+struct intr_entry intrs[HTIF_NDEV];
+
+uint64_t
+htif_command(uint64_t arg)
+{
+
+ return (machine_command(ECALL_HTIF_CMD, arg));
+}
+
+int
+htif_setup_intr(int id, void *func, void *arg)
+{
+
+ if (id >= HTIF_NDEV)
+ return (-1);
+
+ intrs[id].func = func;
+ intrs[id].arg = arg;
+
+ return (0);
+}
+
+static void
+htif_handle_entry(struct htif_softc *sc)
+{
+ uint64_t entry;
+ uint8_t devcmd;
+ uint8_t devid;
+
+ entry = machine_command(ECALL_HTIF_GET_ENTRY, 0);
+ while (entry) {
+ devid = HTIF_DEV_ID(entry);
+ devcmd = HTIF_DEV_CMD(entry);
+
+ if (devcmd == HTIF_CMD_IDENTIFY) {
+ /* Enumeration interrupt */
+ if (devid == sc->identify_id)
+ sc->identify_done = 1;
+ } else {
+ /* Device interrupt */
+ if (intrs[devid].func != NULL)
+ intrs[devid].func(intrs[devid].arg, entry);
+ }
+
+ entry = machine_command(ECALL_HTIF_GET_ENTRY, 0);
+ }
+}
+
+static int
+htif_intr(void *arg)
+{
+ struct htif_softc *sc;
+
+ sc = arg;
+
+ htif_handle_entry(sc);
+
+ csr_clear(sip, SIE_SSIE);
+
+ return (FILTER_HANDLED);
+}
+
+static int
+htif_add_device(struct htif_softc *sc, int i, char *id, char *name)
+{
+ struct htif_dev_ivars *di;
+
+ di = malloc(sizeof(struct htif_dev_ivars), M_DEVBUF, M_WAITOK | M_ZERO);
+ di->sc = sc;
+ di->index = i;
+ di->id = malloc(HTIF_ID_LEN, M_DEVBUF, M_WAITOK | M_ZERO);
+ memcpy(di->id, id, HTIF_ID_LEN);
+
+ di->dev = device_add_child(sc->dev, name, -1);
+ device_set_ivars(di->dev, di);
+
+ return (0);
+}
+
+static int
+htif_enumerate(struct htif_softc *sc)
+{
+ char id[HTIF_ID_LEN] __aligned(HTIF_ALIGN);
+ uint64_t paddr;
+ uint64_t data;
+ uint64_t cmd;
+ int len;
+ int i;
+
+ device_printf(sc->dev, "Enumerating devices\n");
+
+ for (i = 0; i < HTIF_NDEV; i++) {
+ paddr = pmap_kextract((vm_offset_t)&id);
+ data = (paddr << IDENTIFY_PADDR_SHIFT);
+ data |= IDENTIFY_IDENT;
+
+ sc->identify_id = i;
+ sc->identify_done = 0;
+
+ cmd = i;
+ cmd <<= HTIF_DEV_ID_SHIFT;
+ cmd |= (HTIF_CMD_IDENTIFY << HTIF_CMD_SHIFT);
+ cmd |= data;
+
+ htif_command(cmd);
+
+ /* Do poll as interrupts are disabled yet */
+ while (sc->identify_done == 0) {
+ htif_handle_entry(sc);
+ }
+
+ len = strnlen(id, sizeof(id));
+ if (len <= 0) {
+ continue;
+ }
+
+ if (bootverbose)
+ printf(" %d %s\n", i, id);
+
+ if (strncmp(id, "disk", 4) == 0)
+ htif_add_device(sc, i, id, "htif_blk");
+ else if (strncmp(id, "bcd", 3) == 0)
+ htif_add_device(sc, i, id, "htif_console");
+ else if (strncmp(id, "syscall_proxy", 13) == 0)
+ htif_add_device(sc, i, id, "htif_syscall_proxy");
+ }
+
+ return (bus_generic_attach(sc->dev));
+}
+
+int
+htif_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
+{
+ struct htif_dev_ivars *ivars;
+
+ ivars = device_get_ivars(child);
+
+ switch (which) {
+ case HTIF_IVAR_INDEX:
+ *result = ivars->index;
+ break;
+ case HTIF_IVAR_ID:
+ *result = (uintptr_t)ivars->id;
+ default:
+ return (EINVAL);
+ }
+
+ return (0);
+}
+
+static int
+htif_probe(device_t dev)
+{
+
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (!ofw_bus_is_compatible(dev, "riscv,htif"))
+ return (ENXIO);
+
+ device_set_desc(dev, "HTIF bus device");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+htif_attach(device_t dev)
+{
+ struct htif_softc *sc;
+ int error;
+
+ sc = device_get_softc(dev);
+ sc->dev = dev;
+
+ if (bus_alloc_resources(dev, htif_spec, sc->res)) {
+ device_printf(dev, "could not allocate resources\n");
+ return (ENXIO);
+ }
+
+ /* Setup IRQs handler */
+ error = bus_setup_intr(dev, sc->res[0], INTR_TYPE_CLK,
+ htif_intr, NULL, sc, &sc->ihl[0]);
+ if (error) {
+ device_printf(dev, "Unable to alloc int resource.\n");
+ return (ENXIO);
+ }
+
+ csr_set(sie, SIE_SSIE);
+
+ return (htif_enumerate(sc));
+}
+
+static device_method_t htif_methods[] = {
+ DEVMETHOD(device_probe, htif_probe),
+ DEVMETHOD(device_attach, htif_attach),
+
+ /* Bus interface */
+ DEVMETHOD(bus_read_ivar, htif_read_ivar),
+
+ DEVMETHOD_END
+};
+
+static driver_t htif_driver = {
+ "htif",
+ htif_methods,
+ sizeof(struct htif_softc)
+};
+
+static devclass_t htif_devclass;
+
+DRIVER_MODULE(htif, simplebus, htif_driver,
+ htif_devclass, 0, 0);
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