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Diffstat (limited to 'arch/arm/mach-versatile/pci.c')
-rw-r--r--arch/arm/mach-versatile/pci.c47
1 files changed, 30 insertions, 17 deletions
diff --git a/arch/arm/mach-versatile/pci.c b/arch/arm/mach-versatile/pci.c
index e92e5e0705bc..c97be4ea76d2 100644
--- a/arch/arm/mach-versatile/pci.c
+++ b/arch/arm/mach-versatile/pci.c
@@ -43,9 +43,9 @@
#define PCI_IMAP0 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x0)
#define PCI_IMAP1 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x4)
#define PCI_IMAP2 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x8)
-#define PCI_SMAP0 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x10)
-#define PCI_SMAP1 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x14)
-#define PCI_SMAP2 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x18)
+#define PCI_SMAP0 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x14)
+#define PCI_SMAP1 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x18)
+#define PCI_SMAP2 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x1c)
#define PCI_SELFID __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0xc)
#define DEVICE_ID_OFFSET 0x00
@@ -170,8 +170,8 @@ static struct pci_ops pci_versatile_ops = {
.write = versatile_write_config,
};
-static struct resource io_mem = {
- .name = "PCI I/O space",
+static struct resource unused_mem = {
+ .name = "PCI unused",
.start = VERSATILE_PCI_MEM_BASE0,
.end = VERSATILE_PCI_MEM_BASE0+VERSATILE_PCI_MEM_BASE0_SIZE-1,
.flags = IORESOURCE_MEM,
@@ -195,9 +195,9 @@ static int __init pci_versatile_setup_resources(struct pci_sys_data *sys)
{
int ret = 0;
- ret = request_resource(&iomem_resource, &io_mem);
+ ret = request_resource(&iomem_resource, &unused_mem);
if (ret) {
- printk(KERN_ERR "PCI: unable to allocate I/O "
+ printk(KERN_ERR "PCI: unable to allocate unused "
"memory region (%d)\n", ret);
goto out;
}
@@ -205,7 +205,7 @@ static int __init pci_versatile_setup_resources(struct pci_sys_data *sys)
if (ret) {
printk(KERN_ERR "PCI: unable to allocate non-prefetchable "
"memory region (%d)\n", ret);
- goto release_io_mem;
+ goto release_unused_mem;
}
ret = request_resource(&iomem_resource, &pre_mem);
if (ret) {
@@ -225,8 +225,8 @@ static int __init pci_versatile_setup_resources(struct pci_sys_data *sys)
release_non_mem:
release_resource(&non_mem);
- release_io_mem:
- release_resource(&io_mem);
+ release_unused_mem:
+ release_resource(&unused_mem);
out:
return ret;
}
@@ -246,7 +246,7 @@ int __init pci_versatile_setup(int nr, struct pci_sys_data *sys)
goto out;
}
- ret = pci_ioremap_io(0, VERSATILE_PCI_MEM_BASE0);
+ ret = pci_ioremap_io(0, VERSATILE_PCI_IO_BASE);
if (ret)
goto out;
@@ -295,6 +295,19 @@ int __init pci_versatile_setup(int nr, struct pci_sys_data *sys)
__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_2);
/*
+ * For many years the kernel and QEMU were symbiotically buggy
+ * in that they both assumed the same broken IRQ mapping.
+ * QEMU therefore attempts to auto-detect old broken kernels
+ * so that they still work on newer QEMU as they did on old
+ * QEMU. Since we now use the correct (ie matching-hardware)
+ * IRQ mapping we write a definitely different value to a
+ * PCI_INTERRUPT_LINE register to tell QEMU that we expect
+ * real hardware behaviour and it need not be backwards
+ * compatible for us. This write is harmless on real hardware.
+ */
+ __raw_writel(0, VERSATILE_PCI_VIRT_BASE+PCI_INTERRUPT_LINE);
+
+ /*
* Do not to map Versatile FPGA PCI device into memory space
*/
pci_slot_ignore |= (1 << myslot);
@@ -327,13 +340,13 @@ static int __init versatile_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
int irq;
- /* slot, pin, irq
- * 24 1 IRQ_SIC_PCI0
- * 25 1 IRQ_SIC_PCI1
- * 26 1 IRQ_SIC_PCI2
- * 27 1 IRQ_SIC_PCI3
+ /*
+ * Slot INTA INTB INTC INTD
+ * 31 PCI1 PCI2 PCI3 PCI0
+ * 30 PCI0 PCI1 PCI2 PCI3
+ * 29 PCI3 PCI0 PCI1 PCI2
*/
- irq = IRQ_SIC_PCI0 + ((slot - 24 + pin - 1) & 3);
+ irq = IRQ_SIC_PCI0 + ((slot + 2 + pin - 1) & 3);
return irq;
}