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qemu-patch-raspberry4/hw/pci-host/ppce500.c
Michael Davidsaver 67113c0342 e500: fix pci host bridge class/type 
Correct some confusion wrt. the PCI facing
side of the PCI host bridge (not PCIe root complex).
The ref. manual for the mpc8533 (as well as
mpc8540 and mpc8540) give the class code as
PCI_CLASS_PROCESSOR_POWERPC.
While the PCI_HEADER_TYPE field is oddly omitted,
the tables in the "PCI Configuration Header"
section shows a type 0 layout using all 6 BAR
registers (as 2x 32, and 2x 64 bit regions)

So 997505065d
seems to be in error.  Although there was
perhaps some confusion as the mpc8533
has a separate PCIe root complex.
With PCIe, a root complex has PCI_HEADER_TYPE=1.

Neither the PCI host bridge, nor the PCIe
root complex advertise class PCI_CLASS_BRIDGE_PCI.

This was confusing Linux guests, which try
to interpret the host bridge as a pci-pci
bridge, but get confused and re-enumerate
the bus when the primary/secondary/subordinate
bus registers don't have valid values.

Signed-off-by: Michael Davidsaver <mdavidsaver@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2017-12-15 09:49:24 +11:00

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/*
* QEMU PowerPC E500 embedded processors pci controller emulation
*
* Copyright (C) 2009 Freescale Semiconductor, Inc. All rights reserved.
*
* Author: Yu Liu, <yu.liu@freescale.com>
*
* This file is derived from hw/ppc4xx_pci.c,
* the copyright for that material belongs to the original owners.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include "qemu/osdep.h"
#include "hw/hw.h"
#include "hw/ppc/e500-ccsr.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_host.h"
#include "qemu/bswap.h"
#include "hw/pci-host/ppce500.h"
#ifdef DEBUG_PCI
#define pci_debug(fmt, ...) fprintf(stderr, fmt, ## __VA_ARGS__)
#else
#define pci_debug(fmt, ...)
#endif
#define PCIE500_CFGADDR 0x0
#define PCIE500_CFGDATA 0x4
#define PCIE500_REG_BASE 0xC00
#define PCIE500_ALL_SIZE 0x1000
#define PCIE500_REG_SIZE (PCIE500_ALL_SIZE - PCIE500_REG_BASE)
#define PCIE500_PCI_IOLEN 0x10000ULL
#define PPCE500_PCI_CONFIG_ADDR 0x0
#define PPCE500_PCI_CONFIG_DATA 0x4
#define PPCE500_PCI_INTACK 0x8
#define PPCE500_PCI_OW1 (0xC20 - PCIE500_REG_BASE)
#define PPCE500_PCI_OW2 (0xC40 - PCIE500_REG_BASE)
#define PPCE500_PCI_OW3 (0xC60 - PCIE500_REG_BASE)
#define PPCE500_PCI_OW4 (0xC80 - PCIE500_REG_BASE)
#define PPCE500_PCI_IW3 (0xDA0 - PCIE500_REG_BASE)
#define PPCE500_PCI_IW2 (0xDC0 - PCIE500_REG_BASE)
#define PPCE500_PCI_IW1 (0xDE0 - PCIE500_REG_BASE)
#define PPCE500_PCI_GASKET_TIMR (0xE20 - PCIE500_REG_BASE)
#define PCI_POTAR 0x0
#define PCI_POTEAR 0x4
#define PCI_POWBAR 0x8
#define PCI_POWAR 0x10
#define PCI_PITAR 0x0
#define PCI_PIWBAR 0x8
#define PCI_PIWBEAR 0xC
#define PCI_PIWAR 0x10
#define PPCE500_PCI_NR_POBS 5
#define PPCE500_PCI_NR_PIBS 3
#define PIWAR_EN 0x80000000 /* Enable */
#define PIWAR_PF 0x20000000 /* prefetch */
#define PIWAR_TGI_LOCAL 0x00f00000 /* target - local memory */
#define PIWAR_READ_SNOOP 0x00050000
#define PIWAR_WRITE_SNOOP 0x00005000
#define PIWAR_SZ_MASK 0x0000003f
struct pci_outbound {
uint32_t potar;
uint32_t potear;
uint32_t powbar;
uint32_t powar;
MemoryRegion mem;
};
struct pci_inbound {
uint32_t pitar;
uint32_t piwbar;
uint32_t piwbear;
uint32_t piwar;
MemoryRegion mem;
};
#define TYPE_PPC_E500_PCI_HOST_BRIDGE "e500-pcihost"
#define PPC_E500_PCI_HOST_BRIDGE(obj) \
OBJECT_CHECK(PPCE500PCIState, (obj), TYPE_PPC_E500_PCI_HOST_BRIDGE)
struct PPCE500PCIState {
PCIHostState parent_obj;
struct pci_outbound pob[PPCE500_PCI_NR_POBS];
struct pci_inbound pib[PPCE500_PCI_NR_PIBS];
uint32_t gasket_time;
qemu_irq irq[PCI_NUM_PINS];
uint32_t irq_num[PCI_NUM_PINS];
uint32_t first_slot;
uint32_t first_pin_irq;
AddressSpace bm_as;
MemoryRegion bm;
/* mmio maps */
MemoryRegion container;
MemoryRegion iomem;
MemoryRegion pio;
MemoryRegion busmem;
};
#define TYPE_PPC_E500_PCI_BRIDGE "e500-host-bridge"
#define PPC_E500_PCI_BRIDGE(obj) \
OBJECT_CHECK(PPCE500PCIBridgeState, (obj), TYPE_PPC_E500_PCI_BRIDGE)
struct PPCE500PCIBridgeState {
/*< private >*/
PCIDevice parent;
/*< public >*/
MemoryRegion bar0;
};
typedef struct PPCE500PCIBridgeState PPCE500PCIBridgeState;
typedef struct PPCE500PCIState PPCE500PCIState;
static uint64_t pci_reg_read4(void *opaque, hwaddr addr,
unsigned size)
{
PPCE500PCIState *pci = opaque;
unsigned long win;
uint32_t value = 0;
int idx;
win = addr & 0xfe0;
switch (win) {
case PPCE500_PCI_OW1:
case PPCE500_PCI_OW2:
case PPCE500_PCI_OW3:
case PPCE500_PCI_OW4:
idx = (addr >> 5) & 0x7;
switch (addr & 0x1F) {
case PCI_POTAR:
value = pci->pob[idx].potar;
break;
case PCI_POTEAR:
value = pci->pob[idx].potear;
break;
case PCI_POWBAR:
value = pci->pob[idx].powbar;
break;
case PCI_POWAR:
value = pci->pob[idx].powar;
break;
default:
break;
}
break;
case PPCE500_PCI_IW3:
case PPCE500_PCI_IW2:
case PPCE500_PCI_IW1:
idx = ((addr >> 5) & 0x3) - 1;
switch (addr & 0x1F) {
case PCI_PITAR:
value = pci->pib[idx].pitar;
break;
case PCI_PIWBAR:
value = pci->pib[idx].piwbar;
break;
case PCI_PIWBEAR:
value = pci->pib[idx].piwbear;
break;
case PCI_PIWAR:
value = pci->pib[idx].piwar;
break;
default:
break;
};
break;
case PPCE500_PCI_GASKET_TIMR:
value = pci->gasket_time;
break;
default:
break;
}
pci_debug("%s: win:%lx(addr:" TARGET_FMT_plx ") -> value:%x\n", __func__,
win, addr, value);
return value;
}
/* DMA mapping */
static void e500_update_piw(PPCE500PCIState *pci, int idx)
{
uint64_t tar = ((uint64_t)pci->pib[idx].pitar) << 12;
uint64_t wbar = ((uint64_t)pci->pib[idx].piwbar) << 12;
uint64_t war = pci->pib[idx].piwar;
uint64_t size = 2ULL << (war & PIWAR_SZ_MASK);
MemoryRegion *address_space_mem = get_system_memory();
MemoryRegion *mem = &pci->pib[idx].mem;
MemoryRegion *bm = &pci->bm;
char *name;
if (memory_region_is_mapped(mem)) {
/* Before we modify anything, unmap and destroy the region */
memory_region_del_subregion(bm, mem);
object_unparent(OBJECT(mem));
}
if (!(war & PIWAR_EN)) {
/* Not enabled, nothing to do */
return;
}
name = g_strdup_printf("PCI Inbound Window %d", idx);
memory_region_init_alias(mem, OBJECT(pci), name, address_space_mem, tar,
size);
memory_region_add_subregion_overlap(bm, wbar, mem, -1);
g_free(name);
pci_debug("%s: Added window of size=%#lx from PCI=%#lx to CPU=%#lx\n",
__func__, size, wbar, tar);
}
/* BAR mapping */
static void e500_update_pow(PPCE500PCIState *pci, int idx)
{
uint64_t tar = ((uint64_t)pci->pob[idx].potar) << 12;
uint64_t wbar = ((uint64_t)pci->pob[idx].powbar) << 12;
uint64_t war = pci->pob[idx].powar;
uint64_t size = 2ULL << (war & PIWAR_SZ_MASK);
MemoryRegion *mem = &pci->pob[idx].mem;
MemoryRegion *address_space_mem = get_system_memory();
char *name;
if (memory_region_is_mapped(mem)) {
/* Before we modify anything, unmap and destroy the region */
memory_region_del_subregion(address_space_mem, mem);
object_unparent(OBJECT(mem));
}
if (!(war & PIWAR_EN)) {
/* Not enabled, nothing to do */
return;
}
name = g_strdup_printf("PCI Outbound Window %d", idx);
memory_region_init_alias(mem, OBJECT(pci), name, &pci->busmem, tar,
size);
memory_region_add_subregion(address_space_mem, wbar, mem);
g_free(name);
pci_debug("%s: Added window of size=%#lx from CPU=%#lx to PCI=%#lx\n",
__func__, size, wbar, tar);
}
static void pci_reg_write4(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
PPCE500PCIState *pci = opaque;
unsigned long win;
int idx;
win = addr & 0xfe0;
pci_debug("%s: value:%x -> win:%lx(addr:" TARGET_FMT_plx ")\n",
__func__, (unsigned)value, win, addr);
switch (win) {
case PPCE500_PCI_OW1:
case PPCE500_PCI_OW2:
case PPCE500_PCI_OW3:
case PPCE500_PCI_OW4:
idx = (addr >> 5) & 0x7;
switch (addr & 0x1F) {
case PCI_POTAR:
pci->pob[idx].potar = value;
e500_update_pow(pci, idx);
break;
case PCI_POTEAR:
pci->pob[idx].potear = value;
e500_update_pow(pci, idx);
break;
case PCI_POWBAR:
pci->pob[idx].powbar = value;
e500_update_pow(pci, idx);
break;
case PCI_POWAR:
pci->pob[idx].powar = value;
e500_update_pow(pci, idx);
break;
default:
break;
};
break;
case PPCE500_PCI_IW3:
case PPCE500_PCI_IW2:
case PPCE500_PCI_IW1:
idx = ((addr >> 5) & 0x3) - 1;
switch (addr & 0x1F) {
case PCI_PITAR:
pci->pib[idx].pitar = value;
e500_update_piw(pci, idx);
break;
case PCI_PIWBAR:
pci->pib[idx].piwbar = value;
e500_update_piw(pci, idx);
break;
case PCI_PIWBEAR:
pci->pib[idx].piwbear = value;
e500_update_piw(pci, idx);
break;
case PCI_PIWAR:
pci->pib[idx].piwar = value;
e500_update_piw(pci, idx);
break;
default:
break;
};
break;
case PPCE500_PCI_GASKET_TIMR:
pci->gasket_time = value;
break;
default:
break;
};
}
static const MemoryRegionOps e500_pci_reg_ops = {
.read = pci_reg_read4,
.write = pci_reg_write4,
.endianness = DEVICE_BIG_ENDIAN,
};
static int mpc85xx_pci_map_irq(PCIDevice *pci_dev, int pin)
{
int devno = pci_dev->devfn >> 3;
int ret;
ret = ppce500_pci_map_irq_slot(devno, pin);
pci_debug("%s: devfn %x irq %d -> %d devno:%x\n", __func__,
pci_dev->devfn, pin, ret, devno);
return ret;
}
static void mpc85xx_pci_set_irq(void *opaque, int pin, int level)
{
PPCE500PCIState *s = opaque;
qemu_irq *pic = s->irq;
pci_debug("%s: PCI irq %d, level:%d\n", __func__, pin , level);
qemu_set_irq(pic[pin], level);
}
static PCIINTxRoute e500_route_intx_pin_to_irq(void *opaque, int pin)
{
PCIINTxRoute route;
PPCE500PCIState *s = opaque;
route.mode = PCI_INTX_ENABLED;
route.irq = s->irq_num[pin];
pci_debug("%s: PCI irq-pin = %d, irq_num= %d\n", __func__, pin, route.irq);
return route;
}
static const VMStateDescription vmstate_pci_outbound = {
.name = "pci_outbound",
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_UINT32(potar, struct pci_outbound),
VMSTATE_UINT32(potear, struct pci_outbound),
VMSTATE_UINT32(powbar, struct pci_outbound),
VMSTATE_UINT32(powar, struct pci_outbound),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_pci_inbound = {
.name = "pci_inbound",
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_UINT32(pitar, struct pci_inbound),
VMSTATE_UINT32(piwbar, struct pci_inbound),
VMSTATE_UINT32(piwbear, struct pci_inbound),
VMSTATE_UINT32(piwar, struct pci_inbound),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_ppce500_pci = {
.name = "ppce500_pci",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_STRUCT_ARRAY(pob, PPCE500PCIState, PPCE500_PCI_NR_POBS, 1,
vmstate_pci_outbound, struct pci_outbound),
VMSTATE_STRUCT_ARRAY(pib, PPCE500PCIState, PPCE500_PCI_NR_PIBS, 1,
vmstate_pci_inbound, struct pci_inbound),
VMSTATE_UINT32(gasket_time, PPCE500PCIState),
VMSTATE_END_OF_LIST()
}
};
#include "exec/address-spaces.h"
static void e500_pcihost_bridge_realize(PCIDevice *d, Error **errp)
{
PPCE500PCIBridgeState *b = PPC_E500_PCI_BRIDGE(d);
PPCE500CCSRState *ccsr = CCSR(container_get(qdev_get_machine(),
"/e500-ccsr"));
memory_region_init_alias(&b->bar0, OBJECT(ccsr), "e500-pci-bar0", &ccsr->ccsr_space,
0, int128_get64(ccsr->ccsr_space.size));
pci_register_bar(d, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &b->bar0);
}
static AddressSpace *e500_pcihost_set_iommu(PCIBus *bus, void *opaque,
int devfn)
{
PPCE500PCIState *s = opaque;
return &s->bm_as;
}
static int e500_pcihost_initfn(SysBusDevice *dev)
{
PCIHostState *h;
PPCE500PCIState *s;
PCIBus *b;
int i;
h = PCI_HOST_BRIDGE(dev);
s = PPC_E500_PCI_HOST_BRIDGE(dev);
for (i = 0; i < ARRAY_SIZE(s->irq); i++) {
sysbus_init_irq(dev, &s->irq[i]);
}
for (i = 0; i < PCI_NUM_PINS; i++) {
s->irq_num[i] = s->first_pin_irq + i;
}
memory_region_init(&s->pio, OBJECT(s), "pci-pio", PCIE500_PCI_IOLEN);
memory_region_init(&s->busmem, OBJECT(s), "pci bus memory", UINT64_MAX);
/* PIO lives at the bottom of our bus space */
memory_region_add_subregion_overlap(&s->busmem, 0, &s->pio, -2);
b = pci_register_bus(DEVICE(dev), NULL, mpc85xx_pci_set_irq,
mpc85xx_pci_map_irq, s, &s->busmem, &s->pio,
PCI_DEVFN(s->first_slot, 0), 4, TYPE_PCI_BUS);
h->bus = b;
/* Set up PCI view of memory */
memory_region_init(&s->bm, OBJECT(s), "bm-e500", UINT64_MAX);
memory_region_add_subregion(&s->bm, 0x0, &s->busmem);
address_space_init(&s->bm_as, &s->bm, "pci-bm");
pci_setup_iommu(b, e500_pcihost_set_iommu, s);
pci_create_simple(b, 0, "e500-host-bridge");
memory_region_init(&s->container, OBJECT(h), "pci-container", PCIE500_ALL_SIZE);
memory_region_init_io(&h->conf_mem, OBJECT(h), &pci_host_conf_be_ops, h,
"pci-conf-idx", 4);
memory_region_init_io(&h->data_mem, OBJECT(h), &pci_host_data_le_ops, h,
"pci-conf-data", 4);
memory_region_init_io(&s->iomem, OBJECT(s), &e500_pci_reg_ops, s,
"pci.reg", PCIE500_REG_SIZE);
memory_region_add_subregion(&s->container, PCIE500_CFGADDR, &h->conf_mem);
memory_region_add_subregion(&s->container, PCIE500_CFGDATA, &h->data_mem);
memory_region_add_subregion(&s->container, PCIE500_REG_BASE, &s->iomem);
sysbus_init_mmio(dev, &s->container);
pci_bus_set_route_irq_fn(b, e500_route_intx_pin_to_irq);
return 0;
}
static void e500_host_bridge_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
k->realize = e500_pcihost_bridge_realize;
k->vendor_id = PCI_VENDOR_ID_FREESCALE;
k->device_id = PCI_DEVICE_ID_MPC8533E;
k->class_id = PCI_CLASS_PROCESSOR_POWERPC;
dc->desc = "Host bridge";
/*
* PCI-facing part of the host bridge, not usable without the
* host-facing part, which can't be device_add'ed, yet.
*/
dc->user_creatable = false;
}
static const TypeInfo e500_host_bridge_info = {
.name = "e500-host-bridge",
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(PPCE500PCIBridgeState),
.class_init = e500_host_bridge_class_init,
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
{ },
},
};
static Property pcihost_properties[] = {
DEFINE_PROP_UINT32("first_slot", PPCE500PCIState, first_slot, 0x11),
DEFINE_PROP_UINT32("first_pin_irq", PPCE500PCIState, first_pin_irq, 0x1),
DEFINE_PROP_END_OF_LIST(),
};
static void e500_pcihost_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
k->init = e500_pcihost_initfn;
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
dc->props = pcihost_properties;
dc->vmsd = &vmstate_ppce500_pci;
}
static const TypeInfo e500_pcihost_info = {
.name = TYPE_PPC_E500_PCI_HOST_BRIDGE,
.parent = TYPE_PCI_HOST_BRIDGE,
.instance_size = sizeof(PPCE500PCIState),
.class_init = e500_pcihost_class_init,
};
static void e500_pci_register_types(void)
{
type_register_static(&e500_pcihost_info);
type_register_static(&e500_host_bridge_info);
}
type_init(e500_pci_register_types)
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