/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2021 ARM Ltd
 *
 * 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 ``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 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.
 */

/* Arm CoreLink CMN-600 Coherent Mesh Network Driver */

#include <sys/cdefs.h>
#include "opt_acpi.h"

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/rman.h>
#include <sys/smp.h>
#include <sys/sysctl.h>

#include <machine/bus.h>
#include <machine/cpu.h>

#include <contrib/dev/acpica/include/acpi.h>
#include <dev/acpica/acpivar.h>

#include <machine/cmn600_reg.h>

#define RD4(sc, r)              bus_read_4((sc)->sc_res[0], (r))
#define RD8(sc, r)              bus_read_8((sc)->sc_res[0], (r))
#define WR4(sc, r, v)           bus_write_4((sc)->sc_res[0], (r), (v))
#define WR8(sc, r, v)           bus_write_8((sc)->sc_res[0], (r), (v))
#define FLD(v, n)               (((v) & n ## _MASK) >> n ## _SHIFT)

static char *cmn600_ids[] = {
        "ARMHC600",
        NULL
};

static struct resource_spec cmn600_res_spec[] = {
        { SYS_RES_MEMORY,       0,      RF_ACTIVE },
        { SYS_RES_MEMORY,       1,      RF_ACTIVE | RF_UNMAPPED | RF_OPTIONAL },
        { SYS_RES_IRQ,          0,      RF_ACTIVE },
        { -1, 0 }
};

struct cmn600_node;

typedef uint64_t (*nd_read_8_t)(struct cmn600_node *, uint32_t);
typedef uint32_t (*nd_read_4_t)(struct cmn600_node *, uint32_t);
typedef void (*nd_write_8_t)(struct cmn600_node *, uint32_t, uint64_t);
typedef void (*nd_write_4_t)(struct cmn600_node *, uint32_t, uint32_t);

struct cmn600_node {
        struct cmn600_softc     *sc;
        off_t                    nd_offset;
        int                      nd_type;
        uint16_t                 nd_id;
        uint16_t                 nd_logical_id;
        uint8_t                  nd_x, nd_y, nd_port, nd_sub;
        uint16_t                 nd_child_count;
        uint32_t                 nd_paired;
        struct cmn600_node      *nd_parent;
        nd_read_8_t              nd_read8;
        nd_read_4_t              nd_read4;
        nd_write_8_t             nd_write8;
        nd_write_4_t             nd_write4;
        struct cmn600_node      **nd_children;
};

struct cmn600_softc {
        device_t         sc_dev;
        int              sc_unit;
        int              sc_domain;
        int              sc_longid;
        int              sc_mesh_x;
        int              sc_mesh_y;
        struct resource *sc_res[3];
        void            *sc_ih;
        int              sc_r2;
        int              sc_rev;
        struct cmn600_node *sc_rootnode;
        struct cmn600_node *sc_dtcnode;
        struct cmn600_node *sc_dvmnode;
        struct cmn600_node *sc_xpnodes[64];
        int (*sc_pmu_ih)(struct trapframe *tf, int unit, int i);
};

static struct cmn600_pmc cmn600_pmcs[CMN600_UNIT_MAX];
static int cmn600_npmcs = 0;

static int cmn600_acpi_detach(device_t dev);
static int cmn600_intr(void *arg);

static void
cmn600_pmc_register(int unit, void *arg, int domain)
{

        if (unit >= CMN600_UNIT_MAX) {
                /* TODO */
                return;
        }

        cmn600_pmcs[unit].arg = arg;
        cmn600_pmcs[unit].domain = domain;
        cmn600_npmcs++;
}

static void
cmn600_pmc_unregister(int unit)
{

        cmn600_pmcs[unit].arg = NULL;
        cmn600_npmcs--;
}

int
cmn600_pmc_nunits(void)
{

        return (cmn600_npmcs);
}

int
cmn600_pmc_getunit(int unit, void **arg, int *domain)
{

        if (unit >= cmn600_npmcs)
                return (EINVAL);
        if (cmn600_pmcs[unit].arg == NULL)
                return (EINVAL);
        *arg = cmn600_pmcs[unit].arg;
        *domain = cmn600_pmcs[unit].domain;
        return (0);
}

int
pmu_cmn600_rev(void *arg)
{
        struct cmn600_softc *sc;

        sc = (struct cmn600_softc *)arg;
        switch (sc->sc_rev) {
        case 0x0:
                return (0x100);
        case 0x1:
                return (0x101);
        case 0x2:
                return (0x102);
        case 0x3:
                return (0x103);
        case 0x4:
                return (0x200);
        case 0x5:
                return (0x300);
        case 0x6:
                return (0x301);
        }
        return (0x302); /* Unknown revision. */
}

static uint64_t
cmn600_node_read8(struct cmn600_node *nd, uint32_t reg)
{

        return (RD8(nd->sc, nd->nd_offset + reg));
}

static void
cmn600_node_write8(struct cmn600_node *nd, uint32_t reg, uint64_t val)
{

        WR8(nd->sc, nd->nd_offset + reg, val);
}

static uint32_t
cmn600_node_read4(struct cmn600_node *nd, uint32_t reg)
{

        return (RD4(nd->sc, nd->nd_offset + reg));
}

static void
cmn600_node_write4(struct cmn600_node *nd, uint32_t reg, uint32_t val)
{

        WR4(nd->sc, nd->nd_offset + reg, val);
}

static const char *
cmn600_node_type_str(int type)
{

#define NAME_OF(t, n)   case NODE_TYPE_ ## t: return n
        switch (type) {
        NAME_OF(INVALID, "<invalid node>");
        NAME_OF(DVM, "DVM");
        NAME_OF(CFG, "CFG");
        NAME_OF(DTC, "DTC");
        NAME_OF(HN_I, "HN-I");
        NAME_OF(HN_F, "HN-F");
        NAME_OF(XP, "XP");
        NAME_OF(SBSX, "SBSX");
        NAME_OF(RN_I, "RN-I");
        NAME_OF(RN_D, "RN-D");
        NAME_OF(RN_SAM, "RN-SAM");
        NAME_OF(CXRA, "CXRA");
        NAME_OF(CXHA, "CXHA");
        NAME_OF(CXLA, "CXLA");
        default:
                return "<unknown node>";
        }
#undef  NAME_OF
}

static const char *
cmn600_xpport_dev_type_str(uint8_t type)
{

#define NAME_OF(t, n)   case POR_MXP_PX_INFO_DEV_TYPE_ ## t: return n
        switch (type) {
        NAME_OF(RN_I, "RN-I");
        NAME_OF(RN_D, "RN-D");
        NAME_OF(RN_F_CHIB, "RN-F CHIB");
        NAME_OF(RN_F_CHIB_ESAM, "RN-F CHIB ESAM");
        NAME_OF(RN_F_CHIA, "RN-F CHIA");
        NAME_OF(RN_F_CHIA_ESAM, "RN-F CHIA ESAM");
        NAME_OF(HN_T, "HN-T");
        NAME_OF(HN_I, "HN-I");
        NAME_OF(HN_D, "HN-D");
        NAME_OF(SN_F, "SN-F");
        NAME_OF(SBSX, "SBSX");
        NAME_OF(HN_F, "HN-F");
        NAME_OF(CXHA, "CXHA");
        NAME_OF(CXRA, "CXRA");
        NAME_OF(CXRH, "CXRH");
        default:
                return "<unknown>";
        }
#undef  NAME_OF
}

static void
cmn600_dump_node(struct cmn600_node *node, int lvl)
{
        int i;

        for (i = 0; i < lvl; i++) printf("    ");
        printf("%s [%dx%d:%d:%d] id: 0x%x @0x%lx Logical Id: 0x%x",
            cmn600_node_type_str(node->nd_type), node->nd_x, node->nd_y,
            node->nd_port, node->nd_sub, node->nd_id, node->nd_offset,
            node->nd_logical_id);
        if (node->nd_child_count > 0)
                printf(", Children: %d", node->nd_child_count);
        printf("\n");
        if (node->nd_type == NODE_TYPE_XP)
                printf("\tPort 0: %s\n\tPort 1: %s\n",
                    cmn600_xpport_dev_type_str(node->nd_read4(node,
                        POR_MXP_P0_INFO) & 0x1f),
                    cmn600_xpport_dev_type_str(node->nd_read4(node,
                        POR_MXP_P1_INFO) & 0x1f));
}

static void
cmn600_dump_node_recursive(struct cmn600_node *node, int lvl)
{
        int i;

        cmn600_dump_node(node, lvl);
        for (i = 0; i < node->nd_child_count; i++) {
                cmn600_dump_node_recursive(node->nd_children[i], lvl + 1);
        }
}

static void
cmn600_dump_nodes_tree(struct cmn600_softc *sc)
{

        device_printf(sc->sc_dev, " nodes:\n");
        cmn600_dump_node_recursive(sc->sc_rootnode, 0);
}

static int
cmn600_sysctl_dump_nodes(SYSCTL_HANDLER_ARGS)
{
        struct cmn600_softc *sc;
        uint32_t val;
        int err;

        sc = (struct cmn600_softc *)arg1;
        val = 0;
        err = sysctl_handle_int(oidp, &val, 0, req);

        if (err)
                return (err);

        if (val != 0)
                cmn600_dump_nodes_tree(sc);

        return (0);
}

static struct cmn600_node *
cmn600_create_node(struct cmn600_softc *sc, off_t node_offset,
    struct cmn600_node *parent, int lvl)
{
        struct cmn600_node *node;
        off_t child_offset;
        uint64_t val;
        int i;

        node = malloc(sizeof(struct cmn600_node), M_DEVBUF, M_WAITOK);
        node->sc = sc;
        node->nd_offset = node_offset;
        node->nd_parent = parent;
        node->nd_read4 = cmn600_node_read4;
        node->nd_read8 = cmn600_node_read8;
        node->nd_write4 = cmn600_node_write4;
        node->nd_write8 = cmn600_node_write8;

        val = node->nd_read8(node, POR_CFGM_NODE_INFO);
        node->nd_type = FLD(val, POR_CFGM_NODE_INFO_NODE_TYPE);
        node->nd_id = FLD(val, POR_CFGM_NODE_INFO_NODE_ID);
        node->nd_logical_id = FLD(val, POR_CFGM_NODE_INFO_LOGICAL_ID);

        val = node->nd_read8(node, POR_CFGM_CHILD_INFO);
        node->nd_child_count = FLD(val, POR_CFGM_CHILD_INFO_CHILD_COUNT);
        child_offset = FLD(val, POR_CFGM_CHILD_INFO_CHILD_PTR_OFFSET);

        if (parent == NULL) {
                /* Find XP node with Id 8. It has to be last in a row. */
                for (i = 0; i < node->nd_child_count; i++) {
                        val = node->nd_read8(node, child_offset + (i * 8));
                        val &= POR_CFGM_CHILD_POINTER_BASE_MASK;
                        val = RD8(sc, val + POR_CFGM_NODE_INFO);

                        if (FLD(val, POR_CFGM_NODE_INFO_NODE_ID) != 8)
                                continue;

                        sc->sc_mesh_x = FLD(val, POR_CFGM_NODE_INFO_LOGICAL_ID);
                        sc->sc_mesh_y = node->nd_child_count / sc->sc_mesh_x;
                        if (bootverbose)
                                printf("Mesh width X/Y %d/%d\n", sc->sc_mesh_x,
                                    sc->sc_mesh_y);

                        if ((sc->sc_mesh_x > 4) || (sc->sc_mesh_y > 4))
                                sc->sc_longid = 1;
                        break;
                }

                val = node->nd_read8(node, POR_INFO_GLOBAL);
                sc->sc_r2 = (val & POR_INFO_GLOBAL_R2_ENABLE) ? 1 : 0;
                val = node->nd_read4(node, POR_CFGM_PERIPH_ID_2_PERIPH_ID_3);
                sc->sc_rev = FLD(val, POR_CFGM_PERIPH_ID_2_REV);
                if (bootverbose)
                        printf("  Rev: %d, R2_ENABLE = %s\n", sc->sc_rev,
                            sc->sc_r2 ? "true" : "false");
        }
        node->nd_sub = FLD(node->nd_id, NODE_ID_SUB);
        node->nd_port = FLD(node->nd_id, NODE_ID_PORT);
        node->nd_paired = 0;
        if (sc->sc_longid == 1) {
                node->nd_x = FLD(node->nd_id, NODE_ID_X3B);
                node->nd_y = FLD(node->nd_id, NODE_ID_Y3B);
        } else {
                node->nd_x = FLD(node->nd_id, NODE_ID_X2B);
                node->nd_y = FLD(node->nd_id, NODE_ID_Y2B);
        }

        if (bootverbose) {
                cmn600_dump_node(node, lvl);
        }

        node->nd_children = (struct cmn600_node **)mallocarray(
            node->nd_child_count, sizeof(struct cmn600_node *), M_DEVBUF,
            M_WAITOK);
        for (i = 0; i < node->nd_child_count; i++) {
                val = node->nd_read8(node, child_offset + (i * 8));
                node->nd_children[i] = cmn600_create_node(sc, val &
                    POR_CFGM_CHILD_POINTER_BASE_MASK, node, lvl + 1);
        }
        switch (node->nd_type) {
        case NODE_TYPE_DTC:
                sc->sc_dtcnode = node;
                break;
        case NODE_TYPE_DVM:
                sc->sc_dvmnode = node;
                break;
        case NODE_TYPE_XP:
                sc->sc_xpnodes[node->nd_id >> NODE_ID_X2B_SHIFT] = node;
                break;
        default:
                break;
        }
        return (node);
}

static void
cmn600_destroy_node(struct cmn600_node *node)
{
        int i;

        for (i = 0; i < node->nd_child_count; i++) {
                if (node->nd_children[i] == NULL)
                        continue;
                cmn600_destroy_node(node->nd_children[i]);
        }
        free(node->nd_children, M_DEVBUF);
        free(node, M_DEVBUF);
}

static int
cmn600_find_node(struct cmn600_softc *sc, int node_id, int type,
    struct cmn600_node **node)
{
        struct cmn600_node *xp, *child;
        uint8_t xp_xy;
        int i;

        switch (type) {
        case NODE_TYPE_INVALID:
                return (ENXIO);
        case NODE_TYPE_CFG:
                *node = sc->sc_rootnode;
                return (0);
        case NODE_TYPE_DTC:
                *node = sc->sc_dtcnode;
                return (0);
        case NODE_TYPE_DVM:
                *node = sc->sc_dvmnode;
                return (0);
        default:
                break;
        }

        xp_xy = node_id >> NODE_ID_X2B_SHIFT;
        if (xp_xy >= 64)
                return (ENXIO);
        if (sc->sc_xpnodes[xp_xy] == NULL)
                return (ENOENT);

        switch (type) {
        case NODE_TYPE_XP:
                *node = sc->sc_xpnodes[xp_xy];
                return (0);
        default:
                xp = sc->sc_xpnodes[xp_xy];
                for (i = 0; i < xp->nd_child_count; i++) {
                        child = xp->nd_children[i];
                        if (child->nd_id == node_id && child->nd_type == type) {
                                *node = child;
                                return (0);
                        }
                }
        }
        return (ENOENT);
}

int
pmu_cmn600_alloc_localpmc(void *arg, int nodeid, int node_type, int *counter)
{
        struct cmn600_node *node;
        struct cmn600_softc *sc;
        uint32_t new, old;
        int i, ret;

        sc = (struct cmn600_softc *)arg;
        switch (node_type) {
        case NODE_TYPE_CXLA:
                break;
        default:
                node_type = NODE_TYPE_XP;
                /* Parent XP node has always zero port and device bits. */
                nodeid &= ~0x07;
        }
        ret = cmn600_find_node(sc, nodeid, node_type, &node);
        if (ret != 0)
                return (ret);
        for (i = 0; i < 4; i++) {
                new = old = node->nd_paired;
                if (old == 0xf)
                        return (EBUSY);
                if ((old & (1 << i)) != 0)
                        continue;
                new |= 1 << i;
                if (atomic_cmpset_32(&node->nd_paired, old, new) != 0)
                        break;
        }
        *counter = i;
        return (0);
}

int
pmu_cmn600_free_localpmc(void *arg, int nodeid, int node_type, int counter)
{
        struct cmn600_node *node;
        struct cmn600_softc *sc;
        uint32_t new, old;
        int ret;

        sc = (struct cmn600_softc *)arg;
        switch (node_type) {
        case NODE_TYPE_CXLA:
                break;
        default:
                node_type = NODE_TYPE_XP;
        }
        ret = cmn600_find_node(sc, nodeid, node_type, &node);
        if (ret != 0)
                return (ret);

        do {
                new = old = node->nd_paired;
                new &= ~(1 << counter);
        } while (atomic_cmpset_32(&node->nd_paired, old, new) == 0);
        return (0);
}

uint32_t
pmu_cmn600_rd4(void *arg, int nodeid, int node_type, off_t reg)
{
        struct cmn600_node *node;
        struct cmn600_softc *sc;
        int ret;

        sc = (struct cmn600_softc *)arg;
        ret = cmn600_find_node(sc, nodeid, node_type, &node);
        if (ret != 0)
                return (UINT32_MAX);
        return (cmn600_node_read4(node, reg));
}

int
pmu_cmn600_wr4(void *arg, int nodeid, int node_type, off_t reg, uint32_t val)
{
        struct cmn600_node *node;
        struct cmn600_softc *sc;
        int ret;

        sc = (struct cmn600_softc *)arg;
        ret = cmn600_find_node(sc, nodeid, node_type, &node);
        if (ret != 0)
                return (ret);
        cmn600_node_write4(node, reg, val);
        return (0);
}

uint64_t
pmu_cmn600_rd8(void *arg, int nodeid, int node_type, off_t reg)
{
        struct cmn600_node *node;
        struct cmn600_softc *sc;
        int ret;

        sc = (struct cmn600_softc *)arg;
        ret = cmn600_find_node(sc, nodeid, node_type, &node);
        if (ret != 0)
                return (UINT64_MAX);
        return (cmn600_node_read8(node, reg));
}

int
pmu_cmn600_wr8(void *arg, int nodeid, int node_type, off_t reg, uint64_t val)
{
        struct cmn600_node *node;
        struct cmn600_softc *sc;
        int ret;

        sc = (struct cmn600_softc *)arg;
        ret = cmn600_find_node(sc, nodeid, node_type, &node);
        if (ret != 0)
                return (ret);
        cmn600_node_write8(node, reg, val);
        return (0);
}

int
pmu_cmn600_set8(void *arg, int nodeid, int node_type, off_t reg, uint64_t val)
{
        struct cmn600_node *node;
        struct cmn600_softc *sc;
        int ret;

        sc = (struct cmn600_softc *)arg;
        ret = cmn600_find_node(sc, nodeid, node_type, &node);
        if (ret != 0)
                return (ret);
        cmn600_node_write8(node, reg, cmn600_node_read8(node, reg) | val);
        return (0);
}

int
pmu_cmn600_clr8(void *arg, int nodeid, int node_type, off_t reg, uint64_t val)
{
        struct cmn600_node *node;
        struct cmn600_softc *sc;
        int ret;

        sc = (struct cmn600_softc *)arg;
        ret = cmn600_find_node(sc, nodeid, node_type, &node);
        if (ret != 0)
                return (ret);
        cmn600_node_write8(node, reg, cmn600_node_read8(node, reg) & ~val);
        return (0);
}

int
pmu_cmn600_md8(void *arg, int nodeid, int node_type, off_t reg, uint64_t mask,
    uint64_t val)
{
        struct cmn600_node *node;
        struct cmn600_softc *sc;
        int ret;

        sc = (struct cmn600_softc *)arg;
        ret = cmn600_find_node(sc, nodeid, node_type, &node);
        if (ret != 0)
                return (ret);
        cmn600_node_write8(node, reg, (cmn600_node_read8(node, reg) & ~mask) |
            val);
        return (0);
}

static int
cmn600_acpi_probe(device_t dev)
{
        int err;

        err = ACPI_ID_PROBE(device_get_parent(dev), dev, cmn600_ids, NULL);
        if (err <= 0)
                device_set_desc(dev, "Arm CoreLink CMN-600 Coherent Mesh Network");

        return (err);
}

static int
cmn600_acpi_attach(device_t dev)
{
        struct sysctl_ctx_list *ctx;
        struct sysctl_oid_list *child;
        struct cmn600_softc *sc;
        int cpu, domain, i, u;
        const char *dname;
        rman_res_t count, periph_base, rootnode_base;
        struct cmn600_node *node;

        dname = device_get_name(dev);
        sc = device_get_softc(dev);
        sc->sc_dev = dev;
        u = device_get_unit(dev);
        sc->sc_unit = u;
        domain = 0;

        if ((resource_int_value(dname, u, "domain", &domain) == 0 ||
            bus_get_domain(dev, &domain) == 0) && domain < MAXMEMDOM) {
                sc->sc_domain = domain;
        }
        if (domain == -1) /* NUMA not supported. Use single domain. */
                domain = 0;
        sc->sc_domain = domain;
        device_printf(dev, "domain=%d\n", sc->sc_domain);

        cpu = CPU_FFS(&cpuset_domain[domain]) - 1;

        i = bus_alloc_resources(dev, cmn600_res_spec, sc->sc_res);
        if (i != 0) {
                device_printf(dev, "cannot allocate resources for device (%d)\n",
                    i);
                return (i);
        }

        bus_get_resource(dev, cmn600_res_spec[0].type, cmn600_res_spec[0].rid,
            &periph_base, &count);
        bus_get_resource(dev, cmn600_res_spec[1].type, cmn600_res_spec[1].rid,
            &rootnode_base, &count);
        rootnode_base -= periph_base;
        if (bootverbose)
                printf("ROOTNODE at %lx x %lx\n", rootnode_base, count);

        sc->sc_rootnode = cmn600_create_node(sc, rootnode_base, NULL, 0);
        ctx = device_get_sysctl_ctx(sc->sc_dev);

        child = SYSCTL_CHILDREN(device_get_sysctl_tree(sc->sc_dev));
        SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "dump_nodes", CTLTYPE_INT |
            CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, cmn600_sysctl_dump_nodes,
            "U", "Dump CMN-600 nodes tree");

        node = sc->sc_dtcnode;
        if (node == NULL)
                return (ENXIO);

        cmn600_pmc_register(sc->sc_unit, (void *)sc, domain);

        node->nd_write8(node, POR_DT_PMCR, 0);
        node->nd_write8(node, POR_DT_PMOVSR_CLR, POR_DT_PMOVSR_ALL);
        node->nd_write8(node, POR_DT_PMCR, POR_DT_PMCR_OVFL_INTR_EN);
        node->nd_write8(node, POR_DT_DTC_CTL, POR_DT_DTC_CTL_DT_EN);

        if (bus_setup_intr(dev, sc->sc_res[2], INTR_TYPE_MISC | INTR_MPSAFE,
            cmn600_intr, NULL, sc, &sc->sc_ih)) {
                bus_release_resources(dev, cmn600_res_spec, sc->sc_res);
                device_printf(dev, "cannot setup interrupt handler\n");
                cmn600_acpi_detach(dev);
                return (ENXIO);
        }
        if (bus_bind_intr(dev, sc->sc_res[2], cpu)) {
                bus_teardown_intr(dev, sc->sc_res[2], sc->sc_ih);
                bus_release_resources(dev, cmn600_res_spec, sc->sc_res);
                device_printf(dev, "cannot setup interrupt handler\n");
                cmn600_acpi_detach(dev);
                return (ENXIO);
        }
        return (0);
}

static int
cmn600_acpi_detach(device_t dev)
{
        struct cmn600_softc *sc;
        struct cmn600_node *node;

        sc = device_get_softc(dev);
        if (sc->sc_res[2] != NULL) {
                bus_teardown_intr(dev, sc->sc_res[2], sc->sc_ih);
        }

        node = sc->sc_dtcnode;
        node->nd_write4(node, POR_DT_DTC_CTL,
            node->nd_read4(node, POR_DT_DTC_CTL) & ~POR_DT_DTC_CTL_DT_EN);
        node->nd_write8(node, POR_DT_PMOVSR_CLR, POR_DT_PMOVSR_ALL);

        cmn600_pmc_unregister(sc->sc_unit);
        cmn600_destroy_node(sc->sc_rootnode);
        bus_release_resources(dev, cmn600_res_spec, sc->sc_res);

        return (0);
}

int
cmn600_pmu_intr_cb(void *arg, int (*handler)(struct trapframe *tf, int unit,
    int i))
{
        struct cmn600_softc *sc;

        sc = (struct cmn600_softc *) arg;
        sc->sc_pmu_ih = handler;
        return (0);
}

static int
cmn600_intr(void *arg)
{
        struct cmn600_node *node;
        struct cmn600_softc *sc;
        struct trapframe *tf;
        uint64_t mask, ready, val;
        int i;
        
        tf = PCPU_GET(curthread)->td_intr_frame;
        sc = (struct cmn600_softc *) arg;
        node = sc->sc_dtcnode;
        val = node->nd_read8(node, POR_DT_PMOVSR);
        if (val & POR_DT_PMOVSR_CYCLE_COUNTER)
                node->nd_write8(node, POR_DT_PMOVSR_CLR,
                    POR_DT_PMOVSR_CYCLE_COUNTER);
        if (val & POR_DT_PMOVSR_EVENT_COUNTERS) {
                for (ready = 0, i = 0; i < 8; i++) {
                        mask = 1 << i;
                        if ((val & mask) == 0)
                                continue;
                        if (sc->sc_pmu_ih != NULL)
                                sc->sc_pmu_ih(tf, sc->sc_unit, i);
                        ready |= mask;

                }
                node->nd_write8(node, POR_DT_PMOVSR_CLR, ready);
        }

        return (FILTER_HANDLED);
}

static device_method_t cmn600_acpi_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,                 cmn600_acpi_probe),
        DEVMETHOD(device_attach,                cmn600_acpi_attach),
        DEVMETHOD(device_detach,                cmn600_acpi_detach),

        /* End */
        DEVMETHOD_END
};

static driver_t cmn600_acpi_driver = {
        "cmn600",
        cmn600_acpi_methods,
        sizeof(struct cmn600_softc),
};

DRIVER_MODULE(cmn600, acpi, cmn600_acpi_driver, 0, 0);
MODULE_VERSION(cmn600, 1);