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fdt_intr.c revision 1.3.2.2
      1 /* $NetBSD: fdt_intr.c,v 1.3.2.2 2015/12/27 12:09:49 skrll Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: fdt_intr.c,v 1.3.2.2 2015/12/27 12:09:49 skrll Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/kmem.h>
     35 
     36 #include <libfdt.h>
     37 #include <dev/fdt/fdtvar.h>
     38 
     39 struct fdtbus_interrupt_controller {
     40 	device_t ic_dev;
     41 	int ic_phandle;
     42 	const struct fdtbus_interrupt_controller_func *ic_funcs;
     43 
     44 	struct fdtbus_interrupt_controller *ic_next;
     45 };
     46 
     47 static struct fdtbus_interrupt_controller *fdtbus_ic = NULL;
     48 
     49 static int
     50 fdtbus_get_interrupt_parent(int phandle)
     51 {
     52 	u_int interrupt_parent;
     53 
     54 	while (phandle >= 0) {
     55 		if (of_getprop_uint32(phandle, "interrupt-parent",
     56 		    &interrupt_parent) == 0) {
     57 			break;
     58 		}
     59 		if (phandle == 0) {
     60 			return -1;
     61 		}
     62 		phandle = OF_parent(phandle);
     63 	}
     64 	if (phandle < 0) {
     65 		return -1;
     66 	}
     67 
     68 	const void *data = fdtbus_get_data();
     69 	const int off = fdt_node_offset_by_phandle(data, interrupt_parent);
     70 	if (off < 0) {
     71 		return -1;
     72 	}
     73 
     74 	return fdtbus_offset2phandle(off);
     75 }
     76 
     77 static struct fdtbus_interrupt_controller *
     78 fdtbus_get_interrupt_controller(int phandle)
     79 {
     80 	struct fdtbus_interrupt_controller *ic;
     81 
     82 	const int ic_phandle = fdtbus_get_interrupt_parent(phandle);
     83 	if (ic_phandle < 0) {
     84 		return NULL;
     85 	}
     86 
     87 	for (ic = fdtbus_ic; ic; ic = ic->ic_next) {
     88 		if (ic->ic_phandle == ic_phandle) {
     89 			return ic;
     90 		}
     91 	}
     92 
     93 	return NULL;
     94 }
     95 
     96 int
     97 fdtbus_register_interrupt_controller(device_t dev, int phandle,
     98     const struct fdtbus_interrupt_controller_func *funcs)
     99 {
    100 	struct fdtbus_interrupt_controller *ic;
    101 
    102 	ic = kmem_alloc(sizeof(*ic), KM_SLEEP);
    103 	ic->ic_dev = dev;
    104 	ic->ic_phandle = phandle;
    105 	ic->ic_funcs = funcs;
    106 
    107 	ic->ic_next = fdtbus_ic;
    108 	fdtbus_ic = ic;
    109 
    110 	return 0;
    111 }
    112 
    113 void *
    114 fdtbus_intr_establish(int phandle, u_int index, int ipl, int flags,
    115     int (*func)(void *), void *arg)
    116 {
    117 	struct fdtbus_interrupt_controller *ic;
    118 
    119 	ic = fdtbus_get_interrupt_controller(phandle);
    120 	if (ic == NULL)
    121 		return NULL;
    122 
    123 	return ic->ic_funcs->establish(ic->ic_dev, phandle, index, ipl,
    124 	    flags, func, arg);
    125 }
    126 
    127 void
    128 fdtbus_intr_disestablish(int phandle, void *ih)
    129 {
    130 	struct fdtbus_interrupt_controller *ic;
    131 
    132 	ic = fdtbus_get_interrupt_controller(phandle);
    133 	KASSERT(ic != NULL);
    134 
    135 	return ic->ic_funcs->disestablish(ic->ic_dev, ih);
    136 }
    137 
    138 bool
    139 fdtbus_intr_str(int phandle, u_int index, char *buf, size_t buflen)
    140 {
    141 	struct fdtbus_interrupt_controller *ic;
    142 
    143 	ic = fdtbus_get_interrupt_controller(phandle);
    144 	if (ic == NULL)
    145 		return false;
    146 
    147 	return ic->ic_funcs->intrstr(ic->ic_dev, phandle, index, buf, buflen);
    148 }
    149