--- /dev/null
+/*
+ * ARM Versatile/PB PCI host controller
+ *
+ * Copyright (c) 2006-2009 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licensed under the LGPL.
+ */
+
+#include "hw/sysbus.h"
+#include "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
+#include "hw/pci/pci_host.h"
+#include "exec/address-spaces.h"
+
+/* Old and buggy versions of QEMU used the wrong mapping from
+ * PCI IRQs to system interrupt lines. Unfortunately the Linux
+ * kernel also had the corresponding bug in setting up interrupts
+ * (so older kernels work on QEMU and not on real hardware).
+ * We automatically detect these broken kernels and flip back
+ * to the broken irq mapping by spotting guest writes to the
+ * PCI_INTERRUPT_LINE register to see where the guest thinks
+ * interrupts are going to be routed. So we start in state
+ * ASSUME_OK on reset, and transition to either BROKEN or
+ * FORCE_OK at the first write to an INTERRUPT_LINE register for
+ * a slot where broken and correct interrupt mapping would differ.
+ * Once in either BROKEN or FORCE_OK we never transition again;
+ * this allows a newer kernel to use the INTERRUPT_LINE
+ * registers arbitrarily once it has indicated that it isn't
+ * broken in its init code somewhere.
+ *
+ * Unfortunately we have to cope with multiple different
+ * variants on the broken kernel behaviour:
+ * phase I (before kernel commit 1bc39ac5d) kernels assume old
+ * QEMU behaviour, so they use IRQ 27 for all slots
+ * phase II (1bc39ac5d and later, but before e3e92a7be6) kernels
+ * swizzle IRQs between slots, but do it wrongly, so they
+ * work only for every fourth PCI card, and only if (like old
+ * QEMU) the PCI host device is at slot 0 rather than where
+ * the h/w actually puts it
+ * phase III (e3e92a7be6 and later) kernels still swizzle IRQs between
+ * slots wrongly, but add a fixed offset of 64 to everything
+ * they write to PCI_INTERRUPT_LINE.
+ *
+ * We live in hope of a mythical phase IV kernel which might
+ * actually behave in ways that work on the hardware. Such a
+ * kernel should probably start off by writing some value neither
+ * 27 nor 91 to slot zero's PCI_INTERRUPT_LINE register to
+ * disable the autodetection. After that it can do what it likes.
+ *
+ * Slot % 4 | hw | I | II | III
+ * -------------------------------
+ * 0 | 29 | 27 | 27 | 91
+ * 1 | 30 | 27 | 28 | 92
+ * 2 | 27 | 27 | 29 | 93
+ * 3 | 28 | 27 | 30 | 94
+ *
+ * Since our autodetection is not perfect we also provide a
+ * property so the user can make us start in BROKEN or FORCE_OK
+ * on reset if they know they have a bad or good kernel.
+ */
+enum {
+ PCI_VPB_IRQMAP_ASSUME_OK,
+ PCI_VPB_IRQMAP_BROKEN,
+ PCI_VPB_IRQMAP_FORCE_OK,
+};
+
+typedef struct {
+ PCIHostState parent_obj;
+
+ qemu_irq irq[4];
+ MemoryRegion controlregs;
+ MemoryRegion mem_config;
+ MemoryRegion mem_config2;
+ /* Containers representing the PCI address spaces */
+ MemoryRegion pci_io_space;
+ MemoryRegion pci_mem_space;
+ /* Alias regions into PCI address spaces which we expose as sysbus regions.
+ * The offsets into pci_mem_space are controlled by the imap registers.
+ */
+ MemoryRegion pci_io_window;
+ MemoryRegion pci_mem_window[3];
+ PCIBus pci_bus;
+ PCIDevice pci_dev;
+
+ /* Constant for life of device: */
+ int realview;
+ uint32_t mem_win_size[3];
+ uint8_t irq_mapping_prop;
+
+ /* Variable state: */
+ uint32_t imap[3];
+ uint32_t smap[3];
+ uint32_t selfid;
+ uint32_t flags;
+ uint8_t irq_mapping;
+} PCIVPBState;
+
+static void pci_vpb_update_window(PCIVPBState *s, int i)
+{
+ /* Adjust the offset of the alias region we use for
+ * the memory window i to account for a change in the
+ * value of the corresponding IMAP register.
+ * Note that the semantics of the IMAP register differ
+ * for realview and versatile variants of the controller.
+ */
+ hwaddr offset;
+ if (s->realview) {
+ /* Top bits of register (masked according to window size) provide
+ * top bits of PCI address.
+ */
+ offset = s->imap[i] & ~(s->mem_win_size[i] - 1);
+ } else {
+ /* Bottom 4 bits of register provide top 4 bits of PCI address */
+ offset = s->imap[i] << 28;
+ }
+ memory_region_set_alias_offset(&s->pci_mem_window[i], offset);
+}
+
+static void pci_vpb_update_all_windows(PCIVPBState *s)
+{
+ /* Update all alias windows based on the current register state */
+ int i;
+
+ for (i = 0; i < 3; i++) {
+ pci_vpb_update_window(s, i);
+ }
+}
+
+static int pci_vpb_post_load(void *opaque, int version_id)
+{
+ PCIVPBState *s = opaque;
+ pci_vpb_update_all_windows(s);
+ return 0;
+}
+
+static const VMStateDescription pci_vpb_vmstate = {
+ .name = "versatile-pci",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .post_load = pci_vpb_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32_ARRAY(imap, PCIVPBState, 3),
+ VMSTATE_UINT32_ARRAY(smap, PCIVPBState, 3),
+ VMSTATE_UINT32(selfid, PCIVPBState),
+ VMSTATE_UINT32(flags, PCIVPBState),
+ VMSTATE_UINT8(irq_mapping, PCIVPBState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+#define TYPE_VERSATILE_PCI "versatile_pci"
+#define PCI_VPB(obj) \
+ OBJECT_CHECK(PCIVPBState, (obj), TYPE_VERSATILE_PCI)
+
+#define TYPE_VERSATILE_PCI_HOST "versatile_pci_host"
+#define PCI_VPB_HOST(obj) \
+ OBJECT_CHECK(PCIDevice, (obj), TYPE_VERSATILE_PCIHOST)
+
+typedef enum {
+ PCI_IMAP0 = 0x0,
+ PCI_IMAP1 = 0x4,
+ PCI_IMAP2 = 0x8,
+ PCI_SELFID = 0xc,
+ PCI_FLAGS = 0x10,
+ PCI_SMAP0 = 0x14,
+ PCI_SMAP1 = 0x18,
+ PCI_SMAP2 = 0x1c,
+} PCIVPBControlRegs;
+
+static void pci_vpb_reg_write(void *opaque, hwaddr addr,
+ uint64_t val, unsigned size)
+{
+ PCIVPBState *s = opaque;
+
+ switch (addr) {
+ case PCI_IMAP0:
+ case PCI_IMAP1:
+ case PCI_IMAP2:
+ {
+ int win = (addr - PCI_IMAP0) >> 2;
+ s->imap[win] = val;
+ pci_vpb_update_window(s, win);
+ break;
+ }
+ case PCI_SELFID:
+ s->selfid = val;
+ break;
+ case PCI_FLAGS:
+ s->flags = val;
+ break;
+ case PCI_SMAP0:
+ case PCI_SMAP1:
+ case PCI_SMAP2:
+ {
+ int win = (addr - PCI_SMAP0) >> 2;
+ s->smap[win] = val;
+ break;
+ }
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "pci_vpb_reg_write: Bad offset %x\n", (int)addr);
+ break;
+ }
+}
+
+static uint64_t pci_vpb_reg_read(void *opaque, hwaddr addr,
+ unsigned size)
+{
+ PCIVPBState *s = opaque;
+
+ switch (addr) {
+ case PCI_IMAP0:
+ case PCI_IMAP1:
+ case PCI_IMAP2:
+ {
+ int win = (addr - PCI_IMAP0) >> 2;
+ return s->imap[win];
+ }
+ case PCI_SELFID:
+ return s->selfid;
+ case PCI_FLAGS:
+ return s->flags;
+ case PCI_SMAP0:
+ case PCI_SMAP1:
+ case PCI_SMAP2:
+ {
+ int win = (addr - PCI_SMAP0) >> 2;
+ return s->smap[win];
+ }
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "pci_vpb_reg_read: Bad offset %x\n", (int)addr);
+ return 0;
+ }
+}
+
+static const MemoryRegionOps pci_vpb_reg_ops = {
+ .read = pci_vpb_reg_read,
+ .write = pci_vpb_reg_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ },
+};
+
+static int pci_vpb_broken_irq(int slot, int irq)
+{
+ /* Determine whether this IRQ value for this slot represents a
+ * known broken Linux kernel behaviour for this slot.
+ * Return one of the PCI_VPB_IRQMAP_ constants:
+ * BROKEN : if this definitely looks like a broken kernel
+ * FORCE_OK : if this definitely looks good
+ * ASSUME_OK : if we can't tell
+ */
+ slot %= PCI_NUM_PINS;
+
+ if (irq == 27) {
+ if (slot == 2) {
+ /* Might be a Phase I kernel, or might be a fixed kernel,
+ * since slot 2 is where we expect this IRQ.
+ */
+ return PCI_VPB_IRQMAP_ASSUME_OK;
+ }
+ /* Phase I kernel */
+ return PCI_VPB_IRQMAP_BROKEN;
+ }
+ if (irq == slot + 27) {
+ /* Phase II kernel */
+ return PCI_VPB_IRQMAP_BROKEN;
+ }
+ if (irq == slot + 27 + 64) {
+ /* Phase III kernel */
+ return PCI_VPB_IRQMAP_BROKEN;
+ }
+ /* Anything else must be a fixed kernel, possibly using an
+ * arbitrary irq map.
+ */
+ return PCI_VPB_IRQMAP_FORCE_OK;
+}
+
+static void pci_vpb_config_write(void *opaque, hwaddr addr,
+ uint64_t val, unsigned size)
+{
+ PCIVPBState *s = opaque;
+ if (!s->realview && (addr & 0xff) == PCI_INTERRUPT_LINE
+ && s->irq_mapping == PCI_VPB_IRQMAP_ASSUME_OK) {
+ uint8_t devfn = addr >> 8;
+ s->irq_mapping = pci_vpb_broken_irq(PCI_SLOT(devfn), val);
+ }
+ pci_data_write(&s->pci_bus, addr, val, size);
+}
+
+static uint64_t pci_vpb_config_read(void *opaque, hwaddr addr,
+ unsigned size)
+{
+ PCIVPBState *s = opaque;
+ uint32_t val;
+ val = pci_data_read(&s->pci_bus, addr, size);
+ return val;
+}
+
+static const MemoryRegionOps pci_vpb_config_ops = {
+ .read = pci_vpb_config_read,
+ .write = pci_vpb_config_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static int pci_vpb_map_irq(PCIDevice *d, int irq_num)
+{
+ PCIVPBState *s = container_of(d->bus, PCIVPBState, pci_bus);
+
+ if (s->irq_mapping == PCI_VPB_IRQMAP_BROKEN) {
+ /* Legacy broken IRQ mapping for compatibility with old and
+ * buggy Linux guests
+ */
+ return irq_num;
+ }
+
+ /* Slot to IRQ mapping for RealView Platform Baseboard 926 backplane
+ * name slot IntA IntB IntC IntD
+ * A 31 IRQ28 IRQ29 IRQ30 IRQ27
+ * B 30 IRQ27 IRQ28 IRQ29 IRQ30
+ * C 29 IRQ30 IRQ27 IRQ28 IRQ29
+ * Slot C is for the host bridge; A and B the peripherals.
+ * Our output irqs 0..3 correspond to the baseboard's 27..30.
+ *
+ * This mapping function takes account of an oddity in the PB926
+ * board wiring, where the FPGA's P_nINTA input is connected to
+ * the INTB connection on the board PCI edge connector, P_nINTB
+ * is connected to INTC, and so on, so everything is one number
+ * further round from where you might expect.
+ */
+ return pci_swizzle_map_irq_fn(d, irq_num + 2);
+}
+
+static int pci_vpb_rv_map_irq(PCIDevice *d, int irq_num)
+{
+ /* Slot to IRQ mapping for RealView EB and PB1176 backplane
+ * name slot IntA IntB IntC IntD
+ * A 31 IRQ50 IRQ51 IRQ48 IRQ49
+ * B 30 IRQ49 IRQ50 IRQ51 IRQ48
+ * C 29 IRQ48 IRQ49 IRQ50 IRQ51
+ * Slot C is for the host bridge; A and B the peripherals.
+ * Our output irqs 0..3 correspond to the baseboard's 48..51.
+ *
+ * The PB1176 and EB boards don't have the PB926 wiring oddity
+ * described above; P_nINTA connects to INTA, P_nINTB to INTB
+ * and so on, which is why this mapping function is different.
+ */
+ return pci_swizzle_map_irq_fn(d, irq_num + 3);
+}
+
+static void pci_vpb_set_irq(void *opaque, int irq_num, int level)
+{
+ qemu_irq *pic = opaque;
+
+ qemu_set_irq(pic[irq_num], level);
+}
+
+static void pci_vpb_reset(DeviceState *d)
+{
+ PCIVPBState *s = PCI_VPB(d);
+
+ s->imap[0] = 0;
+ s->imap[1] = 0;
+ s->imap[2] = 0;
+ s->smap[0] = 0;
+ s->smap[1] = 0;
+ s->smap[2] = 0;
+ s->selfid = 0;
+ s->flags = 0;
+ s->irq_mapping = s->irq_mapping_prop;
+
+ pci_vpb_update_all_windows(s);
+}
+
+static void pci_vpb_init(Object *obj)
+{
+ PCIHostState *h = PCI_HOST_BRIDGE(obj);
+ PCIVPBState *s = PCI_VPB(obj);
+
+ memory_region_init(&s->pci_io_space, OBJECT(s), "pci_io", 1ULL << 32);
+ memory_region_init(&s->pci_mem_space, OBJECT(s), "pci_mem", 1ULL << 32);
+
+ pci_bus_new_inplace(&s->pci_bus, sizeof(s->pci_bus), DEVICE(obj), "pci",
+ &s->pci_mem_space, &s->pci_io_space,
+ PCI_DEVFN(11, 0), TYPE_PCI_BUS);
+ h->bus = &s->pci_bus;
+
+ object_initialize(&s->pci_dev, sizeof(s->pci_dev), TYPE_VERSATILE_PCI_HOST);
+ qdev_set_parent_bus(DEVICE(&s->pci_dev), BUS(&s->pci_bus));
+
+ /* Window sizes for VersatilePB; realview_pci's init will override */
+ s->mem_win_size[0] = 0x0c000000;
+ s->mem_win_size[1] = 0x10000000;
+ s->mem_win_size[2] = 0x10000000;
+}
+
+static void pci_vpb_realize(DeviceState *dev, Error **errp)
+{
+ PCIVPBState *s = PCI_VPB(dev);
+ SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
+ pci_map_irq_fn mapfn;
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ sysbus_init_irq(sbd, &s->irq[i]);
+ }
+
+ if (s->realview) {
+ mapfn = pci_vpb_rv_map_irq;
+ } else {
+ mapfn = pci_vpb_map_irq;
+ }
+
+ pci_bus_irqs(&s->pci_bus, pci_vpb_set_irq, mapfn, s->irq, 4);
+
+ /* Our memory regions are:
+ * 0 : our control registers
+ * 1 : PCI self config window
+ * 2 : PCI config window
+ * 3 : PCI IO window
+ * 4..6 : PCI memory windows
+ */
+ memory_region_init_io(&s->controlregs, OBJECT(s), &pci_vpb_reg_ops, s,
+ "pci-vpb-regs", 0x1000);
+ sysbus_init_mmio(sbd, &s->controlregs);
+ memory_region_init_io(&s->mem_config, OBJECT(s), &pci_vpb_config_ops, s,
+ "pci-vpb-selfconfig", 0x1000000);
+ sysbus_init_mmio(sbd, &s->mem_config);
+ memory_region_init_io(&s->mem_config2, OBJECT(s), &pci_vpb_config_ops, s,
+ "pci-vpb-config", 0x1000000);
+ sysbus_init_mmio(sbd, &s->mem_config2);
+
+ /* The window into I/O space is always into a fixed base address;
+ * its size is the same for both realview and versatile.
+ */
+ memory_region_init_alias(&s->pci_io_window, OBJECT(s), "pci-vbp-io-window",
+ &s->pci_io_space, 0, 0x100000);
+
+ sysbus_init_mmio(sbd, &s->pci_io_space);
+
+ /* Create the alias regions corresponding to our three windows onto
+ * PCI memory space. The sizes vary from board to board; the base
+ * offsets are guest controllable via the IMAP registers.
+ */
+ for (i = 0; i < 3; i++) {
+ memory_region_init_alias(&s->pci_mem_window[i], OBJECT(s), "pci-vbp-window",
+ &s->pci_mem_space, 0, s->mem_win_size[i]);
+ sysbus_init_mmio(sbd, &s->pci_mem_window[i]);
+ }
+
+ /* TODO Remove once realize propagates to child devices. */
+ object_property_set_bool(OBJECT(&s->pci_dev), true, "realized", errp);
+}
+
+static void versatile_pci_host_realize(PCIDevice *d, Error **errp)
+{
+ pci_set_word(d->config + PCI_STATUS,
+ PCI_STATUS_66MHZ | PCI_STATUS_DEVSEL_MEDIUM);
+ pci_set_byte(d->config + PCI_LATENCY_TIMER, 0x10);
+}
+
+static void versatile_pci_host_class_init(ObjectClass *klass, void *data)
+{
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ k->realize = versatile_pci_host_realize;
+ k->vendor_id = PCI_VENDOR_ID_XILINX;
+ k->device_id = PCI_DEVICE_ID_XILINX_XC2VP30;
+ k->class_id = PCI_CLASS_PROCESSOR_CO;
+ /*
+ * PCI-facing part of the host bridge, not usable without the
+ * host-facing part, which can't be device_add'ed, yet.
+ */
+ dc->cannot_instantiate_with_device_add_yet = true;
+}
+
+static const TypeInfo versatile_pci_host_info = {
+ .name = TYPE_VERSATILE_PCI_HOST,
+ .parent = TYPE_PCI_DEVICE,
+ .instance_size = sizeof(PCIDevice),
+ .class_init = versatile_pci_host_class_init,
+};
+
+static Property pci_vpb_properties[] = {
+ DEFINE_PROP_UINT8("broken-irq-mapping", PCIVPBState, irq_mapping_prop,
+ PCI_VPB_IRQMAP_ASSUME_OK),
+ DEFINE_PROP_END_OF_LIST()
+};
+
+static void pci_vpb_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->realize = pci_vpb_realize;
+ dc->reset = pci_vpb_reset;
+ dc->vmsd = &pci_vpb_vmstate;
+ dc->props = pci_vpb_properties;
+}
+
+static const TypeInfo pci_vpb_info = {
+ .name = TYPE_VERSATILE_PCI,
+ .parent = TYPE_PCI_HOST_BRIDGE,
+ .instance_size = sizeof(PCIVPBState),
+ .instance_init = pci_vpb_init,
+ .class_init = pci_vpb_class_init,
+};
+
+static void pci_realview_init(Object *obj)
+{
+ PCIVPBState *s = PCI_VPB(obj);
+
+ s->realview = 1;
+ /* The PCI window sizes are different on Realview boards */
+ s->mem_win_size[0] = 0x01000000;
+ s->mem_win_size[1] = 0x04000000;
+ s->mem_win_size[2] = 0x08000000;
+}
+
+static const TypeInfo pci_realview_info = {
+ .name = "realview_pci",
+ .parent = TYPE_VERSATILE_PCI,
+ .instance_init = pci_realview_init,
+};
+
+static void versatile_pci_register_types(void)
+{
+ type_register_static(&pci_vpb_info);
+ type_register_static(&pci_realview_info);
+ type_register_static(&versatile_pci_host_info);
+}
+
+type_init(versatile_pci_register_types)
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