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hw/openrisc: Add PCI bus support to virt
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This is mostly borrowed from xtensa and riscv as examples.  The
create_pcie_irq_map swizzle function is almost and exact copy
but here we use a single cell interrupt, possibly we can make
this generic.

Signed-off-by: Stafford Horne <shorne@gmail.com>
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@stffrdhrn
stffrdhrn committed Sep 4, 2022
1 parent b5fcfe9 commit 40fef82
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Showing 2 changed files with 157 additions and 6 deletions.
3 changes: 3 additions & 0 deletions hw/openrisc/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -7,8 +7,11 @@ config OR1K_SIM

config OR1K_VIRT
bool
imply PCI_DEVICES
imply VIRTIO_VGA
imply TEST_DEVICES
select PCI
select PCI_EXPRESS_GENERIC_BRIDGE
select GOLDFISH_RTC
select SERIAL
select SIFIVE_TEST
Expand Down
160 changes: 154 additions & 6 deletions hw/openrisc/virt.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,8 @@
#include "hw/core/split-irq.h"
#include "hw/openrisc/boot.h"
#include "hw/misc/sifive_test.h"
#include "hw/pci/pci.h"
#include "hw/pci-host/gpex.h"
#include "hw/qdev-properties.h"
#include "hw/rtc/goldfish_rtc.h"
#include "hw/sysbus.h"
Expand Down Expand Up @@ -47,6 +49,9 @@ typedef struct OR1KVirtState {

enum {
VIRT_DRAM,
VIRT_ECAM,
VIRT_MMIO,
VIRT_PIO,
VIRT_TEST,
VIRT_RTC,
VIRT_VIRTIO,
Expand All @@ -60,6 +65,7 @@ enum {
VIRT_RTC_IRQ = 3,
VIRT_VIRTIO_IRQ = 4, /* to 12 */
VIRTIO_COUNT = 8,
VIRT_PCI_IRQ_BASE = 13, /* to 17 */
};

static const struct MemmapEntry {
Expand All @@ -72,6 +78,9 @@ static const struct MemmapEntry {
[VIRT_RTC] = { 0x96005000, 0x1000 },
[VIRT_VIRTIO] = { 0x97000000, 0x1000 },
[VIRT_OMPIC] = { 0x98000000, VIRT_CPUS_MAX * 8 },
[VIRT_ECAM] = { 0x9e000000, 0x1000000 },
[VIRT_PIO] = { 0x9f000000, 0x1000000 },
[VIRT_MMIO] = { 0xa0000000, 0x10000000 },
};

static struct openrisc_boot_info {
Expand Down Expand Up @@ -115,12 +124,12 @@ static qemu_irq get_per_cpu_irq(OpenRISCCPU *cpus[], int num_cpus, int irq_pin)
static void openrisc_create_fdt(OR1KVirtState *state,
const struct MemmapEntry *memmap,
int num_cpus, uint64_t mem_size,
const char *cmdline)
const char *cmdline,
int32_t *pic_phandle)
{
void *fdt;
int cpu;
char *nodename;
int pic_ph;

fdt = state->fdt = create_device_tree(&state->fdt_size);
if (!fdt) {
Expand Down Expand Up @@ -163,14 +172,14 @@ static void openrisc_create_fdt(OR1KVirtState *state,

nodename = (char *)"/pic";
qemu_fdt_add_subnode(fdt, nodename);
pic_ph = qemu_fdt_alloc_phandle(fdt);
*pic_phandle = qemu_fdt_alloc_phandle(fdt);
qemu_fdt_setprop_string(fdt, nodename, "compatible",
"opencores,or1k-pic-level");
qemu_fdt_setprop_cell(fdt, nodename, "#interrupt-cells", 1);
qemu_fdt_setprop(fdt, nodename, "interrupt-controller", NULL, 0);
qemu_fdt_setprop_cell(fdt, nodename, "phandle", pic_ph);
qemu_fdt_setprop_cell(fdt, nodename, "phandle", *pic_phandle);

qemu_fdt_setprop_cell(fdt, "/", "interrupt-parent", pic_ph);
qemu_fdt_setprop_cell(fdt, "/", "interrupt-parent", *pic_phandle);

qemu_fdt_add_subnode(fdt, "/chosen");
if (cmdline) {
Expand Down Expand Up @@ -275,6 +284,7 @@ static void openrisc_virt_test_init(OR1KVirtState *state, hwaddr base,
g_free(nodename);

}

static void openrisc_virt_rtc_init(OR1KVirtState *state, hwaddr base,
hwaddr size, int num_cpus,
OpenRISCCPU *cpus[], int irq_pin)
Expand All @@ -296,6 +306,134 @@ static void openrisc_virt_rtc_init(OR1KVirtState *state, hwaddr base,
g_free(nodename);

}

static void create_pcie_irq_map(void *fdt, char *nodename, int irq_base,
uint32_t irqchip_phandle)
{
int pin, dev;
uint32_t irq_map_stride = 0;
uint32_t full_irq_map[GPEX_NUM_IRQS * GPEX_NUM_IRQS * 6] = {};
uint32_t *irq_map = full_irq_map;

/*
* This code creates a standard swizzle of interrupts such that
* each device's first interrupt is based on it's PCI_SLOT number.
* (See pci_swizzle_map_irq_fn())
*
* We only need one entry per interrupt in the table (not one per
* possible slot) seeing the interrupt-map-mask will allow the table
* to wrap to any number of devices.
*/
for (dev = 0; dev < GPEX_NUM_IRQS; dev++) {
int devfn = dev << 3;

for (pin = 0; pin < GPEX_NUM_IRQS; pin++) {
int irq_nr = irq_base + ((pin + PCI_SLOT(devfn)) % GPEX_NUM_IRQS);
int i = 0;

/* Fill PCI address cells */
irq_map[i++] = cpu_to_be32(devfn << 8);
irq_map[i++] = 0;
irq_map[i++] = 0;

/* Fill PCI Interrupt cells */
irq_map[i++] = cpu_to_be32(pin + 1);

/* Fill interrupt controller phandle and cells */
irq_map[i++] = cpu_to_be32(irqchip_phandle);
irq_map[i++] = cpu_to_be32(irq_nr);

if (!irq_map_stride) {
irq_map_stride = i;
}
irq_map += irq_map_stride;
}
}

qemu_fdt_setprop(fdt, nodename, "interrupt-map", full_irq_map,
GPEX_NUM_IRQS * GPEX_NUM_IRQS *
irq_map_stride * sizeof(uint32_t));

qemu_fdt_setprop_cells(fdt, nodename, "interrupt-map-mask",
0x1800, 0, 0, 0x7);
}

static void openrisc_virt_pcie_init(OR1KVirtState *state,
hwaddr ecam_base, hwaddr ecam_size,
hwaddr pio_base, hwaddr pio_size,
hwaddr mmio_base, hwaddr mmio_size,
int num_cpus, OpenRISCCPU *cpus[],
int irq_base, int32_t pic_phandle)
{
void *fdt = state->fdt;
char *nodename;
MemoryRegion *alias;
MemoryRegion *reg;
DeviceState *dev;
qemu_irq pcie_irq;
int i;

dev = qdev_new(TYPE_GPEX_HOST);
sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);

/* Map ECAM space. */
alias = g_new0(MemoryRegion, 1);
reg = sysbus_mmio_get_region(SYS_BUS_DEVICE(dev), 0);
memory_region_init_alias(alias, OBJECT(dev), "pcie-ecam",
reg, 0, ecam_size);
memory_region_add_subregion(get_system_memory(), ecam_base, alias);

/*
* Map the MMIO window into system address space so as to expose
* the section of PCI MMIO space which starts at the same base address
* (ie 1:1 mapping for that part of PCI MMIO space visible through
* the window).
*/
alias = g_new0(MemoryRegion, 1);
reg = sysbus_mmio_get_region(SYS_BUS_DEVICE(dev), 1);
memory_region_init_alias(alias, OBJECT(dev), "pcie-mmio",
reg, mmio_base, mmio_size);
memory_region_add_subregion(get_system_memory(), mmio_base, alias);

/* Map IO port space. */
alias = g_new0(MemoryRegion, 1);
reg = sysbus_mmio_get_region(SYS_BUS_DEVICE(dev), 2);
memory_region_init_alias(alias, OBJECT(dev), "pcie-pio",
reg, 0, pio_size);
memory_region_add_subregion(get_system_memory(), pio_base, alias);

/* Connect IRQ lines. */
for (i = 0; i < GPEX_NUM_IRQS; i++) {
pcie_irq = get_per_cpu_irq(cpus, num_cpus, irq_base + i);

sysbus_connect_irq(SYS_BUS_DEVICE(dev), i, pcie_irq);
gpex_set_irq_num(GPEX_HOST(dev), i, irq_base + i);
}

nodename = g_strdup_printf("/soc/pci@%" HWADDR_PRIx, ecam_base);
qemu_fdt_add_subnode(fdt, nodename);
qemu_fdt_setprop_cell(fdt, nodename, "#interrupt-cells", 1);
qemu_fdt_setprop_cell(fdt, nodename, "#address-cells", 3);
qemu_fdt_setprop_cell(fdt, nodename, "#size-cells", 2);
qemu_fdt_setprop_string(fdt, nodename, "compatible",
"pci-host-ecam-generic");
qemu_fdt_setprop_string(fdt, nodename, "device_type", "pci");
qemu_fdt_setprop_cell(fdt, nodename, "linux,pci-domain", 0);
qemu_fdt_setprop_cells(fdt, nodename, "bus-range", 0,
ecam_size / PCIE_MMCFG_SIZE_MIN - 1);
qemu_fdt_setprop(fdt, nodename, "dma-coherent", NULL, 0);
qemu_fdt_setprop_cells(fdt, nodename, "reg", ecam_base, ecam_size);
/* pci-address(3) cpu-address(1) pci-size(2) */
qemu_fdt_setprop_cells(fdt, nodename, "ranges",
FDT_PCI_RANGE_IOPORT, 0, 0,
pio_base, 0, pio_size,
FDT_PCI_RANGE_MMIO, 0, mmio_base,
mmio_base, 0, mmio_size);

create_pcie_irq_map(fdt, nodename, irq_base, pic_phandle);
g_free(nodename);
}

static void openrisc_virt_virtio_init(OR1KVirtState *state, hwaddr base,
hwaddr size, int num_cpus,
OpenRISCCPU *cpus[], int irq_pin)
Expand Down Expand Up @@ -333,6 +471,7 @@ static void openrisc_virt_init(MachineState *machine)
hwaddr load_addr;
int n;
unsigned int smp_cpus = machine->smp.cpus;
int32_t pic_phandle;

assert(smp_cpus >= 1 && smp_cpus <= VIRT_CPUS_MAX);
for (n = 0; n < smp_cpus; n++) {
Expand All @@ -352,7 +491,7 @@ static void openrisc_virt_init(MachineState *machine)
memory_region_add_subregion(get_system_memory(), 0, ram);

openrisc_create_fdt(state, virt_memmap, smp_cpus, machine->ram_size,
machine->kernel_cmdline);
machine->kernel_cmdline, &pic_phandle);

if (smp_cpus > 1) {
openrisc_virt_ompic_init(state, virt_memmap[VIRT_OMPIC].base,
Expand All @@ -371,6 +510,15 @@ static void openrisc_virt_init(MachineState *machine)
virt_memmap[VIRT_RTC].size, smp_cpus, cpus,
VIRT_RTC_IRQ);

openrisc_virt_pcie_init(state, virt_memmap[VIRT_ECAM].base,
virt_memmap[VIRT_ECAM].size,
virt_memmap[VIRT_PIO].base,
virt_memmap[VIRT_PIO].size,
virt_memmap[VIRT_MMIO].base,
virt_memmap[VIRT_MMIO].size,
smp_cpus, cpus,
VIRT_PCI_IRQ_BASE, pic_phandle);

for (n = 0; n < VIRTIO_COUNT; n++) {
openrisc_virt_virtio_init(state, virt_memmap[VIRT_VIRTIO].base
+ n * virt_memmap[VIRT_VIRTIO].size,
Expand Down

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