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qemu-e2k/hw/ppc/ppc440_pcix.c
BALATON Zoltan via 5cbd51a5a5 ppc440_pcix: Fix up pci config access 
This fixes a long standing issue with MorphOS booting on sam460ex
which turns out to be because of suspicious values written to PCI
config address that apparently works on real machine but caused wrong
access on this device model. This replaces a previous work around for
this with a better fix that makes it work.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-Id: <6fd215ab2bc5f8d4455cd20ed1a2f059e4415fe5.1609636173.git.balaton@eik.bme.hu>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-01-06 11:09:59 +11:00

540 lines
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/*
* Emulation of the ibm,plb-pcix PCI controller
* This is found in some 440 SoCs e.g. the 460EX.
*
* Copyright (c) 2016-2018 BALATON Zoltan
*
* Derived from ppc4xx_pci.c and pci-host/ppce500.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "hw/irq.h"
#include "hw/ppc/ppc.h"
#include "hw/ppc/ppc4xx.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_host.h"
#include "exec/address-spaces.h"
#include "trace.h"
#include "qom/object.h"
struct PLBOutMap {
uint64_t la;
uint64_t pcia;
uint32_t sa;
MemoryRegion mr;
};
struct PLBInMap {
uint64_t sa;
uint64_t la;
MemoryRegion mr;
};
#define TYPE_PPC440_PCIX_HOST_BRIDGE "ppc440-pcix-host"
OBJECT_DECLARE_SIMPLE_TYPE(PPC440PCIXState, PPC440_PCIX_HOST_BRIDGE)
#define PPC440_PCIX_NR_POMS 3
#define PPC440_PCIX_NR_PIMS 3
struct PPC440PCIXState {
PCIHostState parent_obj;
PCIDevice *dev;
struct PLBOutMap pom[PPC440_PCIX_NR_POMS];
struct PLBInMap pim[PPC440_PCIX_NR_PIMS];
uint32_t sts;
qemu_irq irq;
AddressSpace bm_as;
MemoryRegion bm;
MemoryRegion container;
MemoryRegion iomem;
MemoryRegion busmem;
};
#define PPC440_REG_BASE 0x80000
#define PPC440_REG_SIZE 0xff
#define PCIC0_CFGADDR 0x0
#define PCIC0_CFGDATA 0x4
#define PCIX0_POM0LAL 0x68
#define PCIX0_POM0LAH 0x6c
#define PCIX0_POM0SA 0x70
#define PCIX0_POM0PCIAL 0x74
#define PCIX0_POM0PCIAH 0x78
#define PCIX0_POM1LAL 0x7c
#define PCIX0_POM1LAH 0x80
#define PCIX0_POM1SA 0x84
#define PCIX0_POM1PCIAL 0x88
#define PCIX0_POM1PCIAH 0x8c
#define PCIX0_POM2SA 0x90
#define PCIX0_PIM0SAL 0x98
#define PCIX0_PIM0LAL 0x9c
#define PCIX0_PIM0LAH 0xa0
#define PCIX0_PIM1SA 0xa4
#define PCIX0_PIM1LAL 0xa8
#define PCIX0_PIM1LAH 0xac
#define PCIX0_PIM2SAL 0xb0
#define PCIX0_PIM2LAL 0xb4
#define PCIX0_PIM2LAH 0xb8
#define PCIX0_PIM0SAH 0xf8
#define PCIX0_PIM2SAH 0xfc
#define PCIX0_STS 0xe0
#define PCI_ALL_SIZE (PPC440_REG_BASE + PPC440_REG_SIZE)
static void ppc440_pcix_clear_region(MemoryRegion *parent,
MemoryRegion *mem)
{
if (memory_region_is_mapped(mem)) {
memory_region_del_subregion(parent, mem);
object_unparent(OBJECT(mem));
}
}
/* DMA mapping */
static void ppc440_pcix_update_pim(PPC440PCIXState *s, int idx)
{
MemoryRegion *mem = &s->pim[idx].mr;
char *name;
uint64_t size;
/* Before we modify anything, unmap and destroy the region */
ppc440_pcix_clear_region(&s->bm, mem);
if (!(s->pim[idx].sa & 1)) {
/* Not enabled, nothing to do */
return;
}
name = g_strdup_printf("PCI Inbound Window %d", idx);
size = ~(s->pim[idx].sa & ~7ULL) + 1;
memory_region_init_alias(mem, OBJECT(s), name, get_system_memory(),
s->pim[idx].la, size);
memory_region_add_subregion_overlap(&s->bm, 0, mem, -1);
g_free(name);
trace_ppc440_pcix_update_pim(idx, size, s->pim[idx].la);
}
/* BAR mapping */
static void ppc440_pcix_update_pom(PPC440PCIXState *s, int idx)
{
MemoryRegion *mem = &s->pom[idx].mr;
MemoryRegion *address_space_mem = get_system_memory();
char *name;
uint32_t size;
/* Before we modify anything, unmap and destroy the region */
ppc440_pcix_clear_region(address_space_mem, mem);
if (!(s->pom[idx].sa & 1)) {
/* Not enabled, nothing to do */
return;
}
name = g_strdup_printf("PCI Outbound Window %d", idx);
size = ~(s->pom[idx].sa & 0xfffffffe) + 1;
if (!size) {
size = 0xffffffff;
}
memory_region_init_alias(mem, OBJECT(s), name, &s->busmem,
s->pom[idx].pcia, size);
memory_region_add_subregion(address_space_mem, s->pom[idx].la, mem);
g_free(name);
trace_ppc440_pcix_update_pom(idx, size, s->pom[idx].la, s->pom[idx].pcia);
}
static void ppc440_pcix_reg_write4(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
struct PPC440PCIXState *s = opaque;
trace_ppc440_pcix_reg_write(addr, val, size);
switch (addr) {
case PCI_VENDOR_ID ... PCI_MAX_LAT:
stl_le_p(s->dev->config + addr, val);
break;
case PCIX0_POM0LAL:
s->pom[0].la &= 0xffffffff00000000ULL;
s->pom[0].la |= val;
ppc440_pcix_update_pom(s, 0);
break;
case PCIX0_POM0LAH:
s->pom[0].la &= 0xffffffffULL;
s->pom[0].la |= val << 32;
ppc440_pcix_update_pom(s, 0);
break;
case PCIX0_POM0SA:
s->pom[0].sa = val;
ppc440_pcix_update_pom(s, 0);
break;
case PCIX0_POM0PCIAL:
s->pom[0].pcia &= 0xffffffff00000000ULL;
s->pom[0].pcia |= val;
ppc440_pcix_update_pom(s, 0);
break;
case PCIX0_POM0PCIAH:
s->pom[0].pcia &= 0xffffffffULL;
s->pom[0].pcia |= val << 32;
ppc440_pcix_update_pom(s, 0);
break;
case PCIX0_POM1LAL:
s->pom[1].la &= 0xffffffff00000000ULL;
s->pom[1].la |= val;
ppc440_pcix_update_pom(s, 1);
break;
case PCIX0_POM1LAH:
s->pom[1].la &= 0xffffffffULL;
s->pom[1].la |= val << 32;
ppc440_pcix_update_pom(s, 1);
break;
case PCIX0_POM1SA:
s->pom[1].sa = val;
ppc440_pcix_update_pom(s, 1);
break;
case PCIX0_POM1PCIAL:
s->pom[1].pcia &= 0xffffffff00000000ULL;
s->pom[1].pcia |= val;
ppc440_pcix_update_pom(s, 1);
break;
case PCIX0_POM1PCIAH:
s->pom[1].pcia &= 0xffffffffULL;
s->pom[1].pcia |= val << 32;
ppc440_pcix_update_pom(s, 1);
break;
case PCIX0_POM2SA:
s->pom[2].sa = val;
break;
case PCIX0_PIM0SAL:
s->pim[0].sa &= 0xffffffff00000000ULL;
s->pim[0].sa |= val;
ppc440_pcix_update_pim(s, 0);
break;
case PCIX0_PIM0LAL:
s->pim[0].la &= 0xffffffff00000000ULL;
s->pim[0].la |= val;
ppc440_pcix_update_pim(s, 0);
break;
case PCIX0_PIM0LAH:
s->pim[0].la &= 0xffffffffULL;
s->pim[0].la |= val << 32;
ppc440_pcix_update_pim(s, 0);
break;
case PCIX0_PIM1SA:
s->pim[1].sa = val;
ppc440_pcix_update_pim(s, 1);
break;
case PCIX0_PIM1LAL:
s->pim[1].la &= 0xffffffff00000000ULL;
s->pim[1].la |= val;
ppc440_pcix_update_pim(s, 1);
break;
case PCIX0_PIM1LAH:
s->pim[1].la &= 0xffffffffULL;
s->pim[1].la |= val << 32;
ppc440_pcix_update_pim(s, 1);
break;
case PCIX0_PIM2SAL:
s->pim[2].sa &= 0xffffffff00000000ULL;
s->pim[2].sa |= val;
ppc440_pcix_update_pim(s, 2);
break;
case PCIX0_PIM2LAL:
s->pim[2].la &= 0xffffffff00000000ULL;
s->pim[2].la |= val;
ppc440_pcix_update_pim(s, 2);
break;
case PCIX0_PIM2LAH:
s->pim[2].la &= 0xffffffffULL;
s->pim[2].la |= val << 32;
ppc440_pcix_update_pim(s, 2);
break;
case PCIX0_STS:
s->sts = val;
break;
case PCIX0_PIM0SAH:
s->pim[0].sa &= 0xffffffffULL;
s->pim[0].sa |= val << 32;
ppc440_pcix_update_pim(s, 0);
break;
case PCIX0_PIM2SAH:
s->pim[2].sa &= 0xffffffffULL;
s->pim[2].sa |= val << 32;
ppc440_pcix_update_pim(s, 2);
break;
default:
qemu_log_mask(LOG_UNIMP,
"%s: unhandled PCI internal register 0x%"HWADDR_PRIx"\n",
__func__, addr);
break;
}
}
static uint64_t ppc440_pcix_reg_read4(void *opaque, hwaddr addr,
unsigned size)
{
struct PPC440PCIXState *s = opaque;
uint32_t val;
switch (addr) {
case PCI_VENDOR_ID ... PCI_MAX_LAT:
val = ldl_le_p(s->dev->config + addr);
break;
case PCIX0_POM0LAL:
val = s->pom[0].la;
break;
case PCIX0_POM0LAH:
val = s->pom[0].la >> 32;
break;
case PCIX0_POM0SA:
val = s->pom[0].sa;
break;
case PCIX0_POM0PCIAL:
val = s->pom[0].pcia;
break;
case PCIX0_POM0PCIAH:
val = s->pom[0].pcia >> 32;
break;
case PCIX0_POM1LAL:
val = s->pom[1].la;
break;
case PCIX0_POM1LAH:
val = s->pom[1].la >> 32;
break;
case PCIX0_POM1SA:
val = s->pom[1].sa;
break;
case PCIX0_POM1PCIAL:
val = s->pom[1].pcia;
break;
case PCIX0_POM1PCIAH:
val = s->pom[1].pcia >> 32;
break;
case PCIX0_POM2SA:
val = s->pom[2].sa;
break;
case PCIX0_PIM0SAL:
val = s->pim[0].sa;
break;
case PCIX0_PIM0LAL:
val = s->pim[0].la;
break;
case PCIX0_PIM0LAH:
val = s->pim[0].la >> 32;
break;
case PCIX0_PIM1SA:
val = s->pim[1].sa;
break;
case PCIX0_PIM1LAL:
val = s->pim[1].la;
break;
case PCIX0_PIM1LAH:
val = s->pim[1].la >> 32;
break;
case PCIX0_PIM2SAL:
val = s->pim[2].sa;
break;
case PCIX0_PIM2LAL:
val = s->pim[2].la;
break;
case PCIX0_PIM2LAH:
val = s->pim[2].la >> 32;
break;
case PCIX0_STS:
val = s->sts;
break;
case PCIX0_PIM0SAH:
val = s->pim[0].sa >> 32;
break;
case PCIX0_PIM2SAH:
val = s->pim[2].sa >> 32;
break;
default:
qemu_log_mask(LOG_UNIMP,
"%s: invalid PCI internal register 0x%" HWADDR_PRIx "\n",
__func__, addr);
val = 0;
}
trace_ppc440_pcix_reg_read(addr, val);
return val;
}
static const MemoryRegionOps pci_reg_ops = {
.read = ppc440_pcix_reg_read4,
.write = ppc440_pcix_reg_write4,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void ppc440_pcix_reset(DeviceState *dev)
{
struct PPC440PCIXState *s = PPC440_PCIX_HOST_BRIDGE(dev);
int i;
for (i = 0; i < PPC440_PCIX_NR_POMS; i++) {
ppc440_pcix_clear_region(get_system_memory(), &s->pom[i].mr);
}
for (i = 0; i < PPC440_PCIX_NR_PIMS; i++) {
ppc440_pcix_clear_region(&s->bm, &s->pim[i].mr);
}
memset(s->pom, 0, sizeof(s->pom));
memset(s->pim, 0, sizeof(s->pim));
for (i = 0; i < PPC440_PCIX_NR_PIMS; i++) {
s->pim[i].sa = 0xffffffff00000000ULL;
}
s->sts = 0;
}
/*
* All four IRQ[ABCD] pins from all slots are tied to a single board
* IRQ, so our mapping function here maps everything to IRQ 0.
* The code in pci_change_irq_level() tracks the number of times
* the mapped IRQ is asserted and deasserted, so if multiple devices
* assert an IRQ at the same time the behaviour is correct.
*
* This may need further refactoring for boards that use multiple IRQ lines.
*/
static int ppc440_pcix_map_irq(PCIDevice *pci_dev, int irq_num)
{
trace_ppc440_pcix_map_irq(pci_dev->devfn, irq_num, 0);
return 0;
}
static void ppc440_pcix_set_irq(void *opaque, int irq_num, int level)
{
qemu_irq *pci_irq = opaque;
trace_ppc440_pcix_set_irq(irq_num);
if (irq_num < 0) {
error_report("%s: PCI irq %d", __func__, irq_num);
return;
}
qemu_set_irq(*pci_irq, level);
}
static AddressSpace *ppc440_pcix_set_iommu(PCIBus *b, void *opaque, int devfn)
{
PPC440PCIXState *s = opaque;
return &s->bm_as;
}
/*
* Some guests on sam460ex write all kinds of garbage here such as
* missing enable bit and low bits set and still expect this to work
* (apparently it does on real hardware because these boot there) so
* we have to override these ops here and fix it up
*/
static void pci_host_config_write(void *opaque, hwaddr addr,
uint64_t val, unsigned len)
{
PCIHostState *s = opaque;
if (addr != 0 || len != 4) {
return;
}
s->config_reg = (val & 0xfffffffcULL) | (1UL << 31);
}
static uint64_t pci_host_config_read(void *opaque, hwaddr addr,
unsigned len)
{
PCIHostState *s = opaque;
uint32_t val = s->config_reg;
return val;
}
const MemoryRegionOps ppc440_pcix_host_conf_ops = {
.read = pci_host_config_read,
.write = pci_host_config_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void ppc440_pcix_realize(DeviceState *dev, Error **errp)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
PPC440PCIXState *s;
PCIHostState *h;
h = PCI_HOST_BRIDGE(dev);
s = PPC440_PCIX_HOST_BRIDGE(dev);
sysbus_init_irq(sbd, &s->irq);
memory_region_init(&s->busmem, OBJECT(dev), "pci bus memory", UINT64_MAX);
h->bus = pci_register_root_bus(dev, NULL, ppc440_pcix_set_irq,
ppc440_pcix_map_irq, &s->irq, &s->busmem,
get_system_io(), PCI_DEVFN(0, 0), 1, TYPE_PCI_BUS);
s->dev = pci_create_simple(h->bus, PCI_DEVFN(0, 0), "ppc4xx-host-bridge");
memory_region_init(&s->bm, OBJECT(s), "bm-ppc440-pcix", UINT64_MAX);
memory_region_add_subregion(&s->bm, 0x0, &s->busmem);
address_space_init(&s->bm_as, &s->bm, "pci-bm");
pci_setup_iommu(h->bus, ppc440_pcix_set_iommu, s);
memory_region_init(&s->container, OBJECT(s), "pci-container", PCI_ALL_SIZE);
memory_region_init_io(&h->conf_mem, OBJECT(s), &ppc440_pcix_host_conf_ops,
h, "pci-conf-idx", 4);
memory_region_init_io(&h->data_mem, OBJECT(s), &pci_host_data_le_ops,
h, "pci-conf-data", 4);
memory_region_init_io(&s->iomem, OBJECT(s), &pci_reg_ops, s,
"pci.reg", PPC440_REG_SIZE);
memory_region_add_subregion(&s->container, PCIC0_CFGADDR, &h->conf_mem);
memory_region_add_subregion(&s->container, PCIC0_CFGDATA, &h->data_mem);
memory_region_add_subregion(&s->container, PPC440_REG_BASE, &s->iomem);
sysbus_init_mmio(sbd, &s->container);
}
static void ppc440_pcix_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = ppc440_pcix_realize;
dc->reset = ppc440_pcix_reset;
}
static const TypeInfo ppc440_pcix_info = {
.name = TYPE_PPC440_PCIX_HOST_BRIDGE,
.parent = TYPE_PCI_HOST_BRIDGE,
.instance_size = sizeof(PPC440PCIXState),
.class_init = ppc440_pcix_class_init,
};
static void ppc440_pcix_register_types(void)
{
type_register_static(&ppc440_pcix_info);
}
type_init(ppc440_pcix_register_types)
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