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/* $OpenBSD: acpiiort.c,v 1.3 2021/03/15 22:56:48 patrick Exp $ */
/*
* Copyright (c) 2021 Patrick Wildt <patrick@blueri.se>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/acpi/acpireg.h>
#include <dev/acpi/acpivar.h>
#include <dev/acpi/dsdt.h>
#include <arm64/dev/acpiiort.h>
SIMPLEQ_HEAD(, acpiiort_smmu) acpiiort_smmu_list =
SIMPLEQ_HEAD_INITIALIZER(acpiiort_smmu_list);
int acpiiort_match(struct device *, void *, void *);
void acpiiort_attach(struct device *, struct device *, void *);
struct cfattach acpiiort_ca = {
sizeof(struct device), acpiiort_match, acpiiort_attach
};
struct cfdriver acpiiort_cd = {
NULL, "acpiiort", DV_DULL
};
int
acpiiort_match(struct device *parent, void *match, void *aux)
{
struct acpi_attach_args *aaa = aux;
struct acpi_table_header *hdr;
/* If we do not have a table, it is not us */
if (aaa->aaa_table == NULL)
return 0;
/* If it is an IORT table, we can attach */
hdr = (struct acpi_table_header *)aaa->aaa_table;
if (memcmp(hdr->signature, IORT_SIG, sizeof(IORT_SIG) - 1) != 0)
return 0;
return 1;
}
void
acpiiort_attach(struct device *parent, struct device *self, void *aux)
{
struct acpi_attach_args *aaa = aux;
struct acpi_iort *iort = (struct acpi_iort *)aaa->aaa_table;
struct acpi_iort_node *node;
struct acpiiort_attach_args aia;
uint32_t offset;
int i;
printf("\n");
memset(&aia, 0, sizeof(aia));
aia.aia_iot = aaa->aaa_iot;
aia.aia_memt = aaa->aaa_memt;
aia.aia_dmat = aaa->aaa_dmat;
offset = iort->offset;
for (i = 0; i < iort->number_of_nodes; i++) {
node = (struct acpi_iort_node *)((char *)iort + offset);
aia.aia_node = node;
config_found(self, &aia, NULL);
offset += node->length;
}
}
void
acpiiort_smmu_register(struct acpiiort_smmu *as)
{
SIMPLEQ_INSERT_TAIL(&acpiiort_smmu_list, as, as_list);
}
bus_dma_tag_t
acpiiort_smmu_map(struct acpi_iort_node *node, uint32_t rid,
bus_dma_tag_t dmat)
{
struct acpiiort_smmu *as;
SIMPLEQ_FOREACH(as, &acpiiort_smmu_list, as_list) {
if (as->as_node == node)
return as->as_map(as->as_cookie, rid, dmat);
}
return dmat;
}
bus_dma_tag_t
acpiiort_device_map(struct aml_node *root, bus_dma_tag_t dmat)
{
struct acpi_table_header *hdr;
struct acpi_iort *iort = NULL;
struct acpi_iort_node *node;
struct acpi_iort_mapping *map;
struct acpi_iort_nc_node *nc;
struct acpi_q *entry;
const char *name;
uint32_t rid, offset;
int i;
name = aml_nodename(root);
/* Look for IORT table. */
SIMPLEQ_FOREACH(entry, &acpi_softc->sc_tables, q_next) {
hdr = entry->q_table;
if (strncmp(hdr->signature, IORT_SIG,
sizeof(hdr->signature)) == 0) {
iort = entry->q_table;
break;
}
}
if (iort == NULL)
return dmat;
/* Find our named component. */
offset = iort->offset;
for (i = 0; i < iort->number_of_nodes; i++) {
node = (struct acpi_iort_node *)((char *)iort + offset);
if (node->type == ACPI_IORT_NAMED_COMPONENT) {
nc = (struct acpi_iort_nc_node *)&node[1];
if (strcmp(nc->device_object_name, name) == 0)
break;
}
offset += node->length;
}
/* No NC found? Weird. */
if (i >= iort->number_of_nodes)
return dmat;
/* Find our output base towards SMMU. */
map = (struct acpi_iort_mapping *)((char *)node + node->mapping_offset);
for (i = 0; i < node->number_of_mappings; i++) {
offset = map[i].output_reference;
if (map[i].flags & ACPI_IORT_MAPPING_SINGLE) {
rid = map[i].output_base;
break;
}
/* Mapping encodes number of IDs in the range minus one. */
if (map[i].input_base <= rid &&
rid <= map[i].input_base + map[i].number_of_ids) {
rid = map[i].output_base + (rid - map[i].input_base);
break;
}
}
/* No mapping found? Even weirder. */
if (i >= node->number_of_mappings)
return dmat;
node = (struct acpi_iort_node *)((char *)iort + offset);
if (node->type == ACPI_IORT_SMMU)
return acpiiort_smmu_map(node, rid, dmat);
return dmat;
}
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