346 lines
7.8 KiB
C
346 lines
7.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 Ruslan Bukin <br@bsdpad.com>
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*
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* This work was supported by Innovate UK project 105694, "Digital Security
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* by Design (DSbD) Technology Platform Prototype".
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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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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <machine/bus.h>
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#include <dev/fdt/simplebus.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include "arm_doorbell.h"
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#define MHU_CHAN_RX_LP 0x000 /* Low priority channel */
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#define MHU_CHAN_RX_HP 0x020 /* High priority channel */
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#define MHU_CHAN_RX_SEC 0x200 /* Secure channel */
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#define MHU_INTR_STAT 0x00
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#define MHU_INTR_SET 0x08
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#define MHU_INTR_CLEAR 0x10
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#define MHU_TX_REG_OFFSET 0x100
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#define DOORBELL_N_CHANNELS 3
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#define DOORBELL_N_DOORBELLS (DOORBELL_N_CHANNELS * 32)
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struct arm_doorbell dbells[DOORBELL_N_DOORBELLS];
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static struct resource_spec arm_doorbell_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE },
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{ SYS_RES_IRQ, 0, RF_ACTIVE },
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{ SYS_RES_IRQ, 1, RF_ACTIVE },
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{ -1, 0 }
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};
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struct arm_doorbell_softc {
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struct resource *res[3];
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void *lp_intr_cookie;
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void *hp_intr_cookie;
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device_t dev;
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};
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static void
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arm_doorbell_lp_intr(void *arg)
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{
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struct arm_doorbell_softc *sc;
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struct arm_doorbell *db;
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uint32_t reg;
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int i;
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sc = arg;
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reg = bus_read_4(sc->res[0], MHU_CHAN_RX_LP + MHU_INTR_STAT);
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for (i = 0; i < 32; i++) {
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if (reg & (1 << i)) {
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db = &dbells[i];
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bus_write_4(sc->res[0], MHU_CHAN_RX_LP + MHU_INTR_CLEAR,
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(1 << i));
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if (db->func != NULL)
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db->func(db->arg);
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}
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}
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}
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static void
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arm_doorbell_hp_intr(void *arg)
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{
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struct arm_doorbell_softc *sc;
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struct arm_doorbell *db;
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uint32_t reg;
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int i;
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sc = arg;
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reg = bus_read_4(sc->res[0], MHU_CHAN_RX_HP + MHU_INTR_STAT);
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for (i = 0; i < 32; i++) {
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if (reg & (1 << i)) {
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db = &dbells[i];
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bus_write_4(sc->res[0], MHU_CHAN_RX_HP + MHU_INTR_CLEAR,
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(1 << i));
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if (db->func != NULL)
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db->func(db->arg);
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}
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}
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}
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static int
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arm_doorbell_probe(device_t dev)
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{
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if (!ofw_bus_is_compatible(dev, "arm,mhu-doorbell"))
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return (ENXIO);
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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device_set_desc(dev, "ARM MHU Doorbell");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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arm_doorbell_attach(device_t dev)
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{
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struct arm_doorbell_softc *sc;
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phandle_t node;
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int error;
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sc = device_get_softc(dev);
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sc->dev = dev;
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node = ofw_bus_get_node(dev);
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if (node == -1)
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return (ENXIO);
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if (bus_alloc_resources(dev, arm_doorbell_spec, sc->res) != 0) {
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device_printf(dev, "Can't allocate resources for device.\n");
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return (ENXIO);
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}
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/* Setup interrupt handlers. */
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error = bus_setup_intr(dev, sc->res[1], INTR_TYPE_MISC | INTR_MPSAFE,
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NULL, arm_doorbell_lp_intr, sc, &sc->lp_intr_cookie);
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if (error != 0) {
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device_printf(dev, "Can't setup LP interrupt handler.\n");
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bus_release_resources(dev, arm_doorbell_spec, sc->res);
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return (ENXIO);
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}
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error = bus_setup_intr(dev, sc->res[2], INTR_TYPE_MISC | INTR_MPSAFE,
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NULL, arm_doorbell_hp_intr, sc, &sc->hp_intr_cookie);
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if (error != 0) {
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device_printf(dev, "Can't setup HP interrupt handler.\n");
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bus_release_resources(dev, arm_doorbell_spec, sc->res);
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return (ENXIO);
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}
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OF_device_register_xref(OF_xref_from_node(node), dev);
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return (0);
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}
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static int
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arm_doorbell_detach(device_t dev)
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{
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return (EBUSY);
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}
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struct arm_doorbell *
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arm_doorbell_ofw_get(device_t dev, const char *name)
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{
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phandle_t node, parent;
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struct arm_doorbell *db;
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device_t db_dev;
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pcell_t *cells;
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int nmboxes;
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int ncells;
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int idx;
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int db_id;
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int error;
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int chan;
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node = ofw_bus_get_node(dev);
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error = ofw_bus_parse_xref_list_get_length(node, "mboxes",
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"#mbox-cells", &nmboxes);
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if (error) {
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device_printf(dev, "%s can't get mboxes list.\n", __func__);
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return (NULL);
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}
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if (nmboxes == 0) {
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device_printf(dev, "%s mbox list is empty.\n", __func__);
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return (NULL);
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}
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error = ofw_bus_find_string_index(node, "mbox-names", name, &idx);
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if (error != 0) {
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device_printf(dev, "%s can't find string index.\n",
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__func__);
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return (NULL);
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}
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error = ofw_bus_parse_xref_list_alloc(node, "mboxes", "#mbox-cells",
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idx, &parent, &ncells, &cells);
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if (error != 0) {
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device_printf(dev, "%s can't get mbox device xref\n",
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__func__);
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return (NULL);
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}
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if (ncells != 2) {
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device_printf(dev, "Unexpected data size.\n");
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OF_prop_free(cells);
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return (NULL);
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}
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db_dev = OF_device_from_xref(parent);
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if (db_dev == NULL) {
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device_printf(dev, "%s: Can't get arm_doorbell device\n",
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__func__);
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OF_prop_free(cells);
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return (NULL);
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}
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chan = cells[0];
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if (chan >= DOORBELL_N_CHANNELS) {
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device_printf(dev, "Unexpected channel number.\n");
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OF_prop_free(cells);
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return (NULL);
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}
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db_id = cells[1];
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if (db_id >= 32) {
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device_printf(dev, "Unexpected channel bit.\n");
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OF_prop_free(cells);
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return (NULL);
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}
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db = &dbells[chan * db_id];
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db->dev = dev;
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db->db_dev = db_dev;
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db->chan = chan;
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db->db = db_id;
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OF_prop_free(cells);
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return (db);
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}
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void
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arm_doorbell_set(struct arm_doorbell *db)
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{
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struct arm_doorbell_softc *sc;
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uint32_t offset;
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sc = device_get_softc(db->db_dev);
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switch (db->chan) {
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case 0:
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offset = MHU_CHAN_RX_LP;
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break;
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case 1:
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offset = MHU_CHAN_RX_HP;
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break;
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case 2:
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offset = MHU_CHAN_RX_SEC;
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break;
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default:
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panic("not reached");
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};
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offset |= MHU_TX_REG_OFFSET;
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bus_write_4(sc->res[0], offset + MHU_INTR_SET, (1 << db->db));
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}
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int
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arm_doorbell_get(struct arm_doorbell *db)
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{
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struct arm_doorbell_softc *sc;
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uint32_t offset;
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uint32_t reg;
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sc = device_get_softc(db->db_dev);
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switch (db->chan) {
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case 0:
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offset = MHU_CHAN_RX_LP;
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break;
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case 1:
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offset = MHU_CHAN_RX_HP;
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break;
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case 2:
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offset = MHU_CHAN_RX_SEC;
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break;
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default:
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panic("not reached");
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};
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reg = bus_read_4(sc->res[0], offset + MHU_INTR_STAT);
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if (reg & (1 << db->db)) {
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bus_write_4(sc->res[0], offset + MHU_INTR_CLEAR,
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(1 << db->db));
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return (1);
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}
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return (0);
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}
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void
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arm_doorbell_set_handler(struct arm_doorbell *db, void (*func)(void *),
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void *arg)
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{
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db->func = func;
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db->arg = arg;
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}
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static device_method_t arm_doorbell_methods[] = {
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DEVMETHOD(device_probe, arm_doorbell_probe),
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DEVMETHOD(device_attach, arm_doorbell_attach),
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DEVMETHOD(device_detach, arm_doorbell_detach),
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DEVMETHOD_END
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};
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DEFINE_CLASS_1(arm_doorbell, arm_doorbell_driver, arm_doorbell_methods,
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sizeof(struct arm_doorbell_softc), simplebus_driver);
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EARLY_DRIVER_MODULE(arm_doorbell, simplebus, arm_doorbell_driver, 0, 0,
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BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
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MODULE_VERSION(arm_doorbell, 1);
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