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Support non-posted MMIO on arm64 with FDT

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To allow hardware to work around a broken memory bus where we need to
support the nonposted-mmio flag.

Reviewed by:	kevans
Differential Revision:	https://reviews.freebsd.org/D34333
This commit is contained in:
Andrew Turner 2023-03-05 12:35:40 +00:00
parent cb894f746c
commit 5a91529479
1 changed files with 52 additions and 3 deletions
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55
sys/arm64/arm64/nexus.c
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@ -64,6 +64,7 @@ __FBSDID("$FreeBSD$");
#ifdef FDT
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/openfirm.h>
#include "ofw_bus_if.h"
#endif
@ -92,6 +93,7 @@ static int nexus_attach(device_t);
#ifdef FDT
static device_probe_t nexus_fdt_probe;
static device_attach_t nexus_fdt_attach;
static bus_activate_resource_t nexus_fdt_activate_resource;
#endif
#ifdef DEV_ACPI
static device_probe_t nexus_acpi_probe;
@ -366,9 +368,10 @@ nexus_get_bus_tag(device_t bus __unused, device_t child __unused)
}
static int
nexus_activate_resource(device_t bus, device_t child, int type, int rid,
struct resource *r)
nexus_activate_resource_flags(device_t bus, device_t child, int type, int rid,
struct resource *r, int flags)
{
struct resource_map_request args;
struct resource_map map;
int err;
@ -382,7 +385,10 @@ nexus_activate_resource(device_t bus, device_t child, int type, int rid,
case SYS_RES_IOPORT:
case SYS_RES_MEMORY:
if ((rman_get_flags(r) & RF_UNMAPPED) == 0) {
err = nexus_map_resource(bus, child, type, r, NULL,
resource_init_map_request(&args);
if ((flags & BUS_SPACE_MAP_NONPOSTED) != 0)
args.memattr = VM_MEMATTR_DEVICE_NP;
err = nexus_map_resource(bus, child, type, r, &args,
&map);
if (err != 0) {
rman_deactivate_resource(r);
@ -402,6 +408,13 @@ nexus_activate_resource(device_t bus, device_t child, int type, int rid,
return (0);
}
static int
nexus_activate_resource(device_t dev, device_t child, int type, int rid,
struct resource *r)
{
return (nexus_activate_resource_flags(dev, child, type, rid, r, 0));
}
static struct resource_list *
nexus_get_reslist(device_t dev, device_t child)
{
@ -497,6 +510,9 @@ static device_method_t nexus_fdt_methods[] = {
DEVMETHOD(device_probe, nexus_fdt_probe),
DEVMETHOD(device_attach, nexus_fdt_attach),
/* Bus interface */
DEVMETHOD(bus_activate_resource, nexus_fdt_activate_resource),
/* OFW interface */
DEVMETHOD(ofw_bus_map_intr, nexus_ofw_map_intr),
@ -529,6 +545,39 @@ nexus_fdt_attach(device_t dev)
return (nexus_attach(dev));
}
static int
nexus_fdt_activate_resource(device_t bus, device_t child, int type, int rid,
struct resource *r)
{
phandle_t node, parent;
int flags;
flags = 0;
switch (type) {
case SYS_RES_MEMORY:
case SYS_RES_IOPORT:
/*
* If the fdt parent has the nonposted-mmio property we
* need to use non-posted IO to access the device. When
* we find this property set the BUS_SPACE_MAP_NONPOSTED
* flag to be passed to bus_space_map.
*/
node = ofw_bus_get_node(child);
if (node != -1) {
parent = OF_parent(node);
if (parent != -1 &&
OF_hasprop(parent, "nonposted-mmio")) {
flags |= BUS_SPACE_MAP_NONPOSTED;
}
}
break;
default:
break;
}
return (nexus_activate_resource_flags(bus, child, type, rid, r, flags));
}
static int
nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
pcell_t *intr)