2 * Copyright 1998 Massachusetts Institute of Technology
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * This code implements a `root nexus' for Arm Architecture
33 * machines. The function of the root nexus is to serve as an
34 * attachment point for both processors and buses, and to manage
35 * resources which are common to all of them. In particular,
36 * this code implements the core resource managers for interrupt
37 * requests and I/O memory address space.
40 #include "opt_platform.h"
42 #include <sys/cdefs.h>
43 #include <sys/param.h>
44 #include <sys/systm.h>
46 #include <sys/interrupt.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/module.h>
55 #include <machine/bus.h>
56 #include <machine/pcb.h>
57 #include <machine/intr.h>
58 #include <machine/resource.h>
59 #include <machine/vmparam.h>
61 #include <arm/arm/nexusvar.h>
64 #include <machine/fdt.h>
65 #include <dev/ofw/ofw_bus_subr.h>
66 #include "ofw_bus_if.h"
69 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
72 struct resource_list nx_resources;
75 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
77 static struct rman mem_rman;
78 static struct rman irq_rman;
80 static device_probe_t nexus_probe;
81 static device_attach_t nexus_attach;
83 static bus_add_child_t nexus_add_child;
84 static bus_print_child_t nexus_print_child;
86 static bus_activate_resource_t nexus_activate_resource;
87 static bus_adjust_resource_t nexus_adjust_resource;
88 static bus_alloc_resource_t nexus_alloc_resource;
89 static bus_deactivate_resource_t nexus_deactivate_resource;
90 static bus_release_resource_t nexus_release_resource;
93 static bus_bind_intr_t nexus_bind_intr;
95 static bus_config_intr_t nexus_config_intr;
96 static bus_describe_intr_t nexus_describe_intr;
97 static bus_setup_intr_t nexus_setup_intr;
98 static bus_teardown_intr_t nexus_teardown_intr;
100 static bus_get_bus_tag_t nexus_get_bus_tag;
101 static bus_get_dma_tag_t nexus_get_dma_tag;
104 static ofw_bus_map_intr_t nexus_ofw_map_intr;
108 * Normally NULL (which results in defaults which are handled in
109 * busdma_machdep), platform init code can use nexus_set_dma_tag() to set this
110 * to a tag that will be inherited by all busses and devices on the platform.
112 static bus_dma_tag_t nexus_dma_tag;
114 static device_method_t nexus_methods[] = {
115 /* Device interface */
116 DEVMETHOD(device_probe, nexus_probe),
117 DEVMETHOD(device_attach, nexus_attach),
120 DEVMETHOD(bus_add_child, nexus_add_child),
121 DEVMETHOD(bus_print_child, nexus_print_child),
122 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
123 DEVMETHOD(bus_adjust_resource, nexus_adjust_resource),
124 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
125 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
126 DEVMETHOD(bus_release_resource, nexus_release_resource),
128 DEVMETHOD(bus_bind_intr, nexus_bind_intr),
130 DEVMETHOD(bus_config_intr, nexus_config_intr),
131 DEVMETHOD(bus_describe_intr, nexus_describe_intr),
132 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
133 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
134 DEVMETHOD(bus_get_bus_tag, nexus_get_bus_tag),
135 DEVMETHOD(bus_get_dma_tag, nexus_get_dma_tag),
137 /* ofw_bus interface */
138 DEVMETHOD(ofw_bus_map_intr, nexus_ofw_map_intr),
143 static driver_t nexus_driver = {
149 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, 0, 0,
150 BUS_PASS_BUS + BUS_PASS_ORDER_EARLY);
153 nexus_probe(device_t dev)
156 device_quiet(dev); /* suppress attach message for neatness */
158 return (BUS_PROBE_DEFAULT);
162 nexus_attach(device_t dev)
165 mem_rman.rm_start = 0;
166 mem_rman.rm_end = BUS_SPACE_MAXADDR;
167 mem_rman.rm_type = RMAN_ARRAY;
168 mem_rman.rm_descr = "I/O memory addresses";
169 if (rman_init(&mem_rman) ||
170 rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR))
171 panic("nexus_probe mem_rman");
172 irq_rman.rm_start = 0;
173 irq_rman.rm_end = ~0;
174 irq_rman.rm_type = RMAN_ARRAY;
175 irq_rman.rm_descr = "Interrupts";
176 if (rman_init(&irq_rman) || rman_manage_region(&irq_rman, 0, ~0))
177 panic("nexus_attach irq_rman");
179 /* First, add ofwbus0. */
180 device_add_child(dev, "ofwbus", 0);
183 * Next, deal with the children we know about already.
185 bus_generic_probe(dev);
186 bus_generic_attach(dev);
192 nexus_print_child(device_t bus, device_t child)
196 retval += bus_print_child_header(bus, child);
197 retval += printf("\n");
203 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
206 struct nexus_device *ndev;
208 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
211 resource_list_init(&ndev->nx_resources);
213 child = device_add_child_ordered(bus, order, name, unit);
215 device_set_ivars(child, ndev);
221 * Allocate a resource on behalf of child. NB: child is usually going to be a
222 * child of one of our descendants, not a direct child of nexus0.
224 static struct resource *
225 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
226 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
230 int needactivate = flags & RF_ACTIVE;
248 rv = rman_reserve_resource(rm, start, end, count, flags, child);
252 rman_set_rid(rv, *rid);
255 if (bus_activate_resource(child, type, *rid, rv)) {
256 rman_release_resource(rv);
265 nexus_adjust_resource(device_t bus __unused, device_t child __unused, int type,
266 struct resource *r, rman_res_t start, rman_res_t end)
280 if (rman_is_region_manager(r, rm) == 0)
282 return (rman_adjust_resource(r, start, end));
286 nexus_release_resource(device_t bus, device_t child, int type, int rid,
287 struct resource *res)
291 if (rman_get_flags(res) & RF_ACTIVE) {
292 error = bus_deactivate_resource(child, type, rid, res);
296 return (rman_release_resource(res));
299 static bus_space_tag_t
300 nexus_get_bus_tag(device_t bus __unused, device_t child __unused)
304 return (fdtbus_bs_tag);
311 nexus_get_dma_tag(device_t dev, device_t child)
314 return (nexus_dma_tag);
318 nexus_set_dma_tag(bus_dma_tag_t tag)
325 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
326 enum intr_polarity pol)
330 device_printf(dev, "bus_config_intr is obsolete and not supported!\n");
336 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
337 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
340 if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
343 return (intr_setup_irq(child, res, filt, intr, arg, flags, cookiep));
347 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
350 return (intr_teardown_irq(child, r, ih));
354 nexus_describe_intr(device_t dev, device_t child, struct resource *irq,
355 void *cookie, const char *descr)
358 return (intr_describe_irq(child, irq, cookie, descr));
363 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
366 return (intr_bind_irq(child, irq, cpu));
371 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
377 bus_space_handle_t vaddr;
379 if ((err = rman_activate_resource(r)) != 0)
383 * If this is a memory resource, map it into the kernel.
385 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
386 paddr = (bus_addr_t)rman_get_start(r);
387 psize = (bus_size_t)rman_get_size(r);
389 err = bus_space_map(fdtbus_bs_tag, paddr, psize, 0, &vaddr);
391 rman_deactivate_resource(r);
394 rman_set_bustag(r, fdtbus_bs_tag);
396 vaddr = (bus_space_handle_t)pmap_mapdev((vm_paddr_t)paddr,
399 rman_deactivate_resource(r);
402 rman_set_bustag(r, (void *)1);
404 rman_set_virtual(r, (void *)vaddr);
405 rman_set_bushandle(r, vaddr);
407 } else if (type == SYS_RES_IRQ) {
408 err = intr_activate_irq(child, r);
410 rman_deactivate_resource(r);
418 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
422 bus_space_handle_t vaddr;
424 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
425 psize = (bus_size_t)rman_get_size(r);
426 vaddr = rman_get_bushandle(r);
430 bus_space_unmap(fdtbus_bs_tag, vaddr, psize);
432 pmap_unmapdev((void *)vaddr, (vm_size_t)psize);
434 rman_set_virtual(r, NULL);
435 rman_set_bushandle(r, 0);
437 } else if (type == SYS_RES_IRQ) {
438 intr_deactivate_irq(child, r);
441 return (rman_deactivate_resource(r));
446 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
450 struct intr_map_data_fdt *fdt_data;
453 len = sizeof(*fdt_data) + icells * sizeof(pcell_t);
454 fdt_data = (struct intr_map_data_fdt *)intr_alloc_map_data(
455 INTR_MAP_DATA_FDT, len, M_WAITOK | M_ZERO);
456 fdt_data->iparent = iparent;
457 fdt_data->ncells = icells;
458 memcpy(fdt_data->cells, intr, icells * sizeof(pcell_t));
459 irq = intr_map_irq(NULL, iparent, (struct intr_map_data *)fdt_data);