qemu/hw/sh4/sh_pci.c

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/*
* SuperH on-chip PCIC emulation.
*
* Copyright (c) 2008 Takashi YOSHII
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "hw/sh4/sh.h"
#include "hw/irq.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_host.h"
#include "qemu/bswap.h"
#include "qemu/module.h"
#include "exec/address-spaces.h"
#define TYPE_SH_PCI_HOST_BRIDGE "sh_pci"
#define SH_PCI_HOST_BRIDGE(obj) \
OBJECT_CHECK(SHPCIState, (obj), TYPE_SH_PCI_HOST_BRIDGE)
typedef struct SHPCIState {
PCIHostState parent_obj;
PCIDevice *dev;
qemu_irq irq[4];
MemoryRegion memconfig_p4;
MemoryRegion memconfig_a7;
MemoryRegion isa;
uint32_t par;
uint32_t mbr;
uint32_t iobr;
} SHPCIState;
static void sh_pci_reg_write (void *p, hwaddr addr, uint64_t val,
unsigned size)
{
SHPCIState *pcic = p;
PCIHostState *phb = PCI_HOST_BRIDGE(pcic);
switch(addr) {
case 0 ... 0xfc:
stl_le_p(pcic->dev->config + addr, val);
break;
case 0x1c0:
pcic->par = val;
break;
case 0x1c4:
pcic->mbr = val & 0xff000001;
break;
case 0x1c8:
sh4: Fix PCI ISA IO memory subregion Booting the r2d machine from flash fails because flash is not discovered. Looking at the flattened memory tree, we see the following. FlatView #1 AS "memory", root: system AS "cpu-memory-0", root: system AS "sh_pci_host", root: bus master container Root memory region: system 0000000000000000-000000000000ffff (prio 0, i/o): io 0000000000010000-0000000000ffffff (prio 0, i/o): r2d.flash @0000000000010000 The overlapping memory region is sh_pci.isa, ie the ISA I/O region bridge. This region is initially assigned to address 0xfe240000, but overwritten with a write into the PCIIOBR register. This write is expected to adjust the PCI memory window, but not to change the region's base adddress. Peter Maydell provided the following detailed explanation. "Section 22.3.7 and in particular figure 22.3 (of "SSH7751R user's manual: hardware") are clear about how this is supposed to work: there is a window at 0xfe240000 in the system register space for PCI I/O space. When the CPU makes an access into that area, the PCI controller calculates the PCI address to use by combining bits 0..17 of the system address with the bits 31..18 value that the guest has put into the PCIIOBR. That is, writing to the PCIIOBR changes which section of the IO address space is visible in the 0xfe240000 window. Instead what QEMU's implementation does is move the window to whatever value the guest writes to the PCIIOBR register -- so if the guest writes 0 we put the window at 0 in system address space." Fix the problem by calling memory_region_set_alias_offset() instead of removing and re-adding the PCI ISA subregion on writes into PCIIOBR. At the same time, in sh_pci_device_realize(), don't set iobr since it is overwritten later anyway. Instead, pass the base address to memory_region_add_subregion() directly. Many thanks to Peter Maydell for the detailed problem analysis, and for providing suggestions on how to fix the problem. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Message-id: 20200218201050.15273-1-linux@roeck-us.net Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2020-02-19 04:10:50 +08:00
pcic->iobr = val & 0xfffc0001;
memory_region_set_alias_offset(&pcic->isa, val & 0xfffc0000);
break;
case 0x220:
pci_data_write(phb->bus, pcic->par, val, 4);
break;
}
}
static uint64_t sh_pci_reg_read (void *p, hwaddr addr,
unsigned size)
{
SHPCIState *pcic = p;
PCIHostState *phb = PCI_HOST_BRIDGE(pcic);
switch(addr) {
case 0 ... 0xfc:
return ldl_le_p(pcic->dev->config + addr);
case 0x1c0:
return pcic->par;
case 0x1c4:
return pcic->mbr;
case 0x1c8:
return pcic->iobr;
case 0x220:
return pci_data_read(phb->bus, pcic->par, 4);
}
return 0;
}
static const MemoryRegionOps sh_pci_reg_ops = {
.read = sh_pci_reg_read,
.write = sh_pci_reg_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
};
static int sh_pci_map_irq(PCIDevice *d, int irq_num)
{
return (d->devfn >> 3);
}
static void sh_pci_set_irq(void *opaque, int irq_num, int level)
{
qemu_irq *pic = opaque;
qemu_set_irq(pic[irq_num], level);
}
static void sh_pci_device_realize(DeviceState *dev, Error **errp)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
SHPCIState *s = SH_PCI_HOST_BRIDGE(dev);
PCIHostState *phb = PCI_HOST_BRIDGE(s);
int i;
for (i = 0; i < 4; i++) {
sysbus_init_irq(sbd, &s->irq[i]);
}
phb->bus = pci_register_root_bus(DEVICE(dev), "pci",
sh_pci_set_irq, sh_pci_map_irq,
s->irq,
get_system_memory(),
get_system_io(),
PCI_DEVFN(0, 0), 4, TYPE_PCI_BUS);
memory_region_init_io(&s->memconfig_p4, OBJECT(s), &sh_pci_reg_ops, s,
"sh_pci", 0x224);
memory_region_init_alias(&s->memconfig_a7, OBJECT(s), "sh_pci.2",
&s->memconfig_p4, 0, 0x224);
memory_region_init_alias(&s->isa, OBJECT(s), "sh_pci.isa",
get_system_io(), 0, 0x40000);
sysbus_init_mmio(sbd, &s->memconfig_p4);
sysbus_init_mmio(sbd, &s->memconfig_a7);
sh4: Fix PCI ISA IO memory subregion Booting the r2d machine from flash fails because flash is not discovered. Looking at the flattened memory tree, we see the following. FlatView #1 AS "memory", root: system AS "cpu-memory-0", root: system AS "sh_pci_host", root: bus master container Root memory region: system 0000000000000000-000000000000ffff (prio 0, i/o): io 0000000000010000-0000000000ffffff (prio 0, i/o): r2d.flash @0000000000010000 The overlapping memory region is sh_pci.isa, ie the ISA I/O region bridge. This region is initially assigned to address 0xfe240000, but overwritten with a write into the PCIIOBR register. This write is expected to adjust the PCI memory window, but not to change the region's base adddress. Peter Maydell provided the following detailed explanation. "Section 22.3.7 and in particular figure 22.3 (of "SSH7751R user's manual: hardware") are clear about how this is supposed to work: there is a window at 0xfe240000 in the system register space for PCI I/O space. When the CPU makes an access into that area, the PCI controller calculates the PCI address to use by combining bits 0..17 of the system address with the bits 31..18 value that the guest has put into the PCIIOBR. That is, writing to the PCIIOBR changes which section of the IO address space is visible in the 0xfe240000 window. Instead what QEMU's implementation does is move the window to whatever value the guest writes to the PCIIOBR register -- so if the guest writes 0 we put the window at 0 in system address space." Fix the problem by calling memory_region_set_alias_offset() instead of removing and re-adding the PCI ISA subregion on writes into PCIIOBR. At the same time, in sh_pci_device_realize(), don't set iobr since it is overwritten later anyway. Instead, pass the base address to memory_region_add_subregion() directly. Many thanks to Peter Maydell for the detailed problem analysis, and for providing suggestions on how to fix the problem. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Message-id: 20200218201050.15273-1-linux@roeck-us.net Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2020-02-19 04:10:50 +08:00
memory_region_add_subregion(get_system_memory(), 0xfe240000, &s->isa);
s->dev = pci_create_simple(phb->bus, PCI_DEVFN(0, 0), "sh_pci_host");
}
static void sh_pci_host_realize(PCIDevice *d, Error **errp)
{
pci_set_word(d->config + PCI_COMMAND, PCI_COMMAND_WAIT);
pci_set_word(d->config + PCI_STATUS, PCI_STATUS_CAP_LIST |
PCI_STATUS_FAST_BACK | PCI_STATUS_DEVSEL_MEDIUM);
}
static void sh_pci_host_class_init(ObjectClass *klass, void *data)
{
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
k->realize = sh_pci_host_realize;
k->vendor_id = PCI_VENDOR_ID_HITACHI;
k->device_id = PCI_DEVICE_ID_HITACHI_SH7751R;
/*
* PCI-facing part of the host bridge, not usable without the
* host-facing part, which can't be device_add'ed, yet.
*/
qdev: Replace cannot_instantiate_with_device_add_yet with !user_creatable cannot_instantiate_with_device_add_yet was introduced by commit efec3dd631d94160288392721a5f9c39e50fb2bc to replace no_user. It was supposed to be a temporary measure. When it was introduced, we had 54 cannot_instantiate_with_device_add_yet=true lines in the code. Today (3 years later) this number has not shrunk: we now have 57 cannot_instantiate_with_device_add_yet=true lines. I think it is safe to say it is not a temporary measure, and we won't see the flag go away soon. Instead of a long field name that misleads people to believe it is temporary, replace it a shorter and less misleading field: user_creatable. Except for code comments, changes were generated using the following Coccinelle patch: @@ expression DC; @@ ( -DC->cannot_instantiate_with_device_add_yet = false; +DC->user_creatable = true; | -DC->cannot_instantiate_with_device_add_yet = true; +DC->user_creatable = false; ) @@ typedef ObjectClass; expression dc; identifier class, data; @@ static void device_class_init(ObjectClass *class, void *data) { ... dc->hotpluggable = true; +dc->user_creatable = true; ... } @@ @@ struct DeviceClass { ... -bool cannot_instantiate_with_device_add_yet; +bool user_creatable; ... } @@ expression DC; @@ ( -!DC->cannot_instantiate_with_device_add_yet +DC->user_creatable | -DC->cannot_instantiate_with_device_add_yet +!DC->user_creatable ) Cc: Alistair Francis <alistair.francis@xilinx.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Marcel Apfelbaum <marcel@redhat.com> Cc: Markus Armbruster <armbru@redhat.com> Cc: Peter Maydell <peter.maydell@linaro.org> Cc: Thomas Huth <thuth@redhat.com> Acked-by: Alistair Francis <alistair.francis@xilinx.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Marcel Apfelbaum <marcel@redhat.com> Acked-by: Marcel Apfelbaum <marcel@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Message-Id: <20170503203604.31462-2-ehabkost@redhat.com> [ehabkost: kept "TODO remove once we're there" comment] Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2017-05-04 04:35:44 +08:00
dc->user_creatable = false;
}
static const TypeInfo sh_pci_host_info = {
.name = "sh_pci_host",
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(PCIDevice),
.class_init = sh_pci_host_class_init,
pci: Add INTERFACE_CONVENTIONAL_PCI_DEVICE to Conventional PCI devices Add INTERFACE_CONVENTIONAL_PCI_DEVICE to all direct subtypes of TYPE_PCI_DEVICE, except: 1) The ones that already have INTERFACE_PCIE_DEVICE set: * base-xhci * e1000e * nvme * pvscsi * vfio-pci * virtio-pci * vmxnet3 2) base-pci-bridge Not all PCI bridges are Conventional PCI devices, so INTERFACE_CONVENTIONAL_PCI_DEVICE is added only to the subtypes that are actually Conventional PCI: * dec-21154-p2p-bridge * i82801b11-bridge * pbm-bridge * pci-bridge The direct subtypes of base-pci-bridge not touched by this patch are: * xilinx-pcie-root: Already marked as PCIe-only. * pcie-pci-bridge: Already marked as PCIe-only. * pcie-port: all non-abstract subtypes of pcie-port are already marked as PCIe-only devices. 3) megasas-base Not all megasas devices are Conventional PCI devices, so the interface names are added to the subclasses registered by megasas_register_types(), according to information in the megasas_devices[] array. "megasas-gen2" already implements INTERFACE_PCIE_DEVICE, so add INTERFACE_CONVENTIONAL_PCI_DEVICE only to "megasas". Acked-by: Alberto Garcia <berto@igalia.com> Acked-by: John Snow <jsnow@redhat.com> Acked-by: Anthony PERARD <anthony.perard@citrix.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Acked-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Marcel Apfelbaum <marcel@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2017-09-28 03:56:34 +08:00
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
{ },
},
};
static void sh_pci_device_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = sh_pci_device_realize;
}
static const TypeInfo sh_pci_device_info = {
.name = TYPE_SH_PCI_HOST_BRIDGE,
.parent = TYPE_PCI_HOST_BRIDGE,
.instance_size = sizeof(SHPCIState),
.class_init = sh_pci_device_class_init,
};
static void sh_pci_register_types(void)
{
type_register_static(&sh_pci_device_info);
type_register_static(&sh_pci_host_info);
}
type_init(sh_pci_register_types)