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/*
* QEMU PowerPC PowerNV Interrupt Control Presenter (ICP) model
*
* Copyright (c) 2017, IBM Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "sysemu/sysemu.h"
#include "qemu/log.h"
#include "hw/ppc/xics.h"
#define ICP_XIRR_POLL 0 /* 1 byte (CPRR) or 4 bytes */
#define ICP_XIRR 4 /* 1 byte (CPRR) or 4 bytes */
#define ICP_MFRR 12 /* 1 byte access only */
#define ICP_LINKA 16 /* unused */
#define ICP_LINKB 20 /* unused */
#define ICP_LINKC 24 /* unused */
static uint64_t pnv_icp_read(void *opaque, hwaddr addr, unsigned width)
{
ICPState *icp = ICP(opaque);
PnvICPState *picp = PNV_ICP(opaque);
bool byte0 = (width == 1 && (addr & 0x3) == 0);
uint64_t val = 0xffffffff;
switch (addr & 0xffc) {
case ICP_XIRR_POLL:
val = icp_ipoll(icp, NULL);
if (byte0) {
val >>= 24;
} else if (width != 4) {
goto bad_access;
}
break;
case ICP_XIRR:
if (byte0) {
val = icp_ipoll(icp, NULL) >> 24;
} else if (width == 4) {
val = icp_accept(icp);
} else {
goto bad_access;
}
break;
case ICP_MFRR:
if (byte0) {
val = icp->mfrr;
} else {
goto bad_access;
}
break;
case ICP_LINKA:
if (width == 4) {
val = picp->links[0];
} else {
goto bad_access;
}
break;
case ICP_LINKB:
if (width == 4) {
val = picp->links[1];
} else {
goto bad_access;
}
break;
case ICP_LINKC:
if (width == 4) {
val = picp->links[2];
} else {
goto bad_access;
}
break;
default:
bad_access:
qemu_log_mask(LOG_GUEST_ERROR, "XICS: Bad ICP access 0x%"
HWADDR_PRIx"/%d\n", addr, width);
}
return val;
}
static void pnv_icp_write(void *opaque, hwaddr addr, uint64_t val,
unsigned width)
{
ICPState *icp = ICP(opaque);
PnvICPState *picp = PNV_ICP(opaque);
bool byte0 = (width == 1 && (addr & 0x3) == 0);
switch (addr & 0xffc) {
case ICP_XIRR:
if (byte0) {
icp_set_cppr(icp, val);
} else if (width == 4) {
icp_eoi(icp, val);
} else {
goto bad_access;
}
break;
case ICP_MFRR:
if (byte0) {
icp_set_mfrr(icp, val);
} else {
goto bad_access;
}
break;
case ICP_LINKA:
if (width == 4) {
picp->links[0] = val;
} else {
goto bad_access;
}
break;
case ICP_LINKB:
if (width == 4) {
picp->links[1] = val;
} else {
goto bad_access;
}
break;
case ICP_LINKC:
if (width == 4) {
picp->links[2] = val;
} else {
goto bad_access;
}
break;
default:
bad_access:
qemu_log_mask(LOG_GUEST_ERROR, "XICS: Bad ICP access 0x%"
HWADDR_PRIx"/%d\n", addr, width);
}
}
static const MemoryRegionOps pnv_icp_ops = {
.read = pnv_icp_read,
.write = pnv_icp_write,
.endianness = DEVICE_BIG_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
},
.impl = {
.min_access_size = 1,
.max_access_size = 4,
},
};
static void pnv_icp_realize(ICPState *icp, Error **errp)
{
PnvICPState *pnv_icp = PNV_ICP(icp);
memory_region_init_io(&pnv_icp->mmio, OBJECT(icp), &pnv_icp_ops,
icp, "icp-thread", 0x1000);
}
static void pnv_icp_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
ICPStateClass *icpc = ICP_CLASS(klass);
icpc->realize = pnv_icp_realize;
dc->desc = "PowerNV ICP";
}
static const TypeInfo pnv_icp_info = {
.name = TYPE_PNV_ICP,
.parent = TYPE_ICP,
.instance_size = sizeof(PnvICPState),
.class_init = pnv_icp_class_init,
.class_size = sizeof(ICPStateClass),
};
static void pnv_icp_register_types(void)
{
type_register_static(&pnv_icp_info);
}
type_init(pnv_icp_register_types)
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