The VersatilePB's PCI controller exposes the PCI memory space to the
system via three regions controlled by the mapping control registers.
Implement this so that guests can actually use MMIO-BAR PCI cards.
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
---
hw/arm/realview.c | 3 +++
hw/arm/versatilepb.c | 3 +++
hw/versatile_pci.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 77 insertions(+), 1 deletion(-)
diff --git a/hw/arm/realview.c b/hw/arm/realview.c
index 23c968b..db41525 100644
--- a/hw/arm/realview.c
+++ b/hw/arm/realview.c
@@ -221,6 +221,9 @@ static void realview_init(QEMUMachineInitArgs *args,
sysbus_mmio_map(busdev, 1, 0x60000000); /* PCI self-config */
sysbus_mmio_map(busdev, 2, 0x61000000); /* PCI config */
sysbus_mmio_map(busdev, 3, 0x62000000); /* PCI I/O */
+ sysbus_mmio_map(busdev, 4, 0x63000000); /* PCI memory window 1 */
+ sysbus_mmio_map(busdev, 5, 0x64000000); /* PCI memory window 2 */
+ sysbus_mmio_map(busdev, 6, 0x68000000); /* PCI memory window 3 */
sysbus_connect_irq(busdev, 0, pic[48]);
sysbus_connect_irq(busdev, 1, pic[49]);
sysbus_connect_irq(busdev, 2, pic[50]);
diff --git a/hw/arm/versatilepb.c b/hw/arm/versatilepb.c
index 9c9bfde..413f0e9 100644
--- a/hw/arm/versatilepb.c
+++ b/hw/arm/versatilepb.c
@@ -228,6 +228,9 @@ static void versatile_init(QEMUMachineInitArgs *args, int
board_id)
sysbus_mmio_map(busdev, 1, 0x41000000); /* PCI self-config */
sysbus_mmio_map(busdev, 2, 0x42000000); /* PCI config */
sysbus_mmio_map(busdev, 3, 0x43000000); /* PCI I/O */
+ sysbus_mmio_map(busdev, 4, 0x44000000); /* PCI memory window 1 */
+ sysbus_mmio_map(busdev, 5, 0x50000000); /* PCI memory window 2 */
+ sysbus_mmio_map(busdev, 6, 0x60000000); /* PCI memory window 3 */
sysbus_connect_irq(busdev, 0, sic[27]);
sysbus_connect_irq(busdev, 1, sic[28]);
sysbus_connect_irq(busdev, 2, sic[29]);
diff --git a/hw/versatile_pci.c b/hw/versatile_pci.c
index a598b64..1575dd7 100644
--- a/hw/versatile_pci.c
+++ b/hw/versatile_pci.c
@@ -20,13 +20,20 @@ typedef struct {
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];
/* Variable state: */
uint32_t imap[3];
@@ -36,10 +43,49 @@ typedef struct {
bool broken_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),
@@ -81,6 +127,7 @@ static void pci_vpb_reg_write(void *opaque, hwaddr addr,
{
int win = (addr - PCI_IMAP0) >> 2;
s->imap[win] = val;
+ pci_vpb_update_window(s, win);
break;
}
case PCI_SELFID:
@@ -257,6 +304,8 @@ static void pci_vpb_reset(DeviceState *d)
s->smap[2] = 0;
s->selfid = 0;
s->flags = 0;
+
+ pci_vpb_update_all_windows(s);
}
static void pci_vpb_init(Object *obj)
@@ -265,9 +314,10 @@ static void pci_vpb_init(Object *obj)
PCIVPBState *s = PCI_VPB(obj);
memory_region_init(&s->pci_io_space, "pci_io", 1ULL << 32);
+ memory_region_init(&s->pci_mem_space, "pci_mem", 1ULL << 32);
pci_bus_new_inplace(&s->pci_bus, DEVICE(obj), "pci",
- get_system_memory(), &s->pci_io_space,
+ &s->pci_mem_space, &s->pci_io_space,
PCI_DEVFN(11, 0));
h->bus = &s->pci_bus;
@@ -275,6 +325,11 @@ static void pci_vpb_init(Object *obj)
qdev_set_parent_bus(DEVICE(&s->pci_dev), BUS(&s->pci_bus));
object_property_set_int(OBJECT(&s->pci_dev), PCI_DEVFN(29, 0), "addr",
NULL);
+
+ /* 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)
@@ -301,6 +356,7 @@ static void pci_vpb_realize(DeviceState *dev, Error **errp)
* 1 : PCI self config window
* 2 : PCI config window
* 3 : PCI IO window
+ * 4..6 : PCI memory windows
*/
memory_region_init_io(&s->controlregs, &pci_vpb_reg_ops, s, "pci-vpb-regs",
0x1000);
@@ -320,6 +376,16 @@ static void pci_vpb_realize(DeviceState *dev, Error **errp)
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], "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);
}
@@ -371,6 +437,10 @@ 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 = {
--
1.7.9.5
