[MIPS] TXx9: PCI fixes for tx3927/tx4927
* Fix tx3927 pci ops for Type-1 configuration
* Fix abort checking of tx3927 pci ops
* Flush write buffer to avoid spurious PCI error interrupt
* Add a quirk for FPCIB backplane
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/pci/ops-tx3927.c b/arch/mips/pci/ops-tx3927.c
index 8a17a39..c6bd79e 100644
--- a/arch/mips/pci/ops-tx3927.c
+++ b/arch/mips/pci/ops-tx3927.c
@@ -41,41 +41,41 @@
#include <asm/addrspace.h>
#include <asm/txx9/tx3927.h>
-static inline int mkaddr(unsigned char bus, unsigned char dev_fn,
- unsigned char where)
+static int mkaddr(struct pci_bus *bus, unsigned char devfn, unsigned char where)
{
- if (bus == 0 && dev_fn >= PCI_DEVFN(TX3927_PCIC_MAX_DEVNU, 0))
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- tx3927_pcicptr->ica = ((bus & 0xff) << 0x10) |
- ((dev_fn & 0xff) << 0x08) |
- (where & 0xfc);
+ if (bus->parent == NULL &&
+ devfn >= PCI_DEVFN(TX3927_PCIC_MAX_DEVNU, 0))
+ return -1;
+ tx3927_pcicptr->ica =
+ ((bus->number & 0xff) << 0x10) |
+ ((devfn & 0xff) << 0x08) |
+ (where & 0xfc) | (bus->parent ? 1 : 0);
/* clear M_ABORT and Disable M_ABORT Int. */
tx3927_pcicptr->pcistat |= PCI_STATUS_REC_MASTER_ABORT;
tx3927_pcicptr->pcistatim &= ~PCI_STATUS_REC_MASTER_ABORT;
-
- return PCIBIOS_SUCCESSFUL;
+ return 0;
}
static inline int check_abort(void)
{
- if (tx3927_pcicptr->pcistat & PCI_STATUS_REC_MASTER_ABORT)
+ if (tx3927_pcicptr->pcistat & PCI_STATUS_REC_MASTER_ABORT) {
tx3927_pcicptr->pcistat |= PCI_STATUS_REC_MASTER_ABORT;
tx3927_pcicptr->pcistatim |= PCI_STATUS_REC_MASTER_ABORT;
+ /* flush write buffer */
+ iob();
return PCIBIOS_DEVICE_NOT_FOUND;
-
+ }
return PCIBIOS_SUCCESSFUL;
}
static int tx3927_pci_read_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 * val)
{
- int ret;
-
- ret = mkaddr(bus->number, devfn, where);
- if (ret)
- return ret;
+ if (mkaddr(bus, devfn, where)) {
+ *val = 0xffffffff;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
switch (size) {
case 1:
@@ -97,11 +97,8 @@
static int tx3927_pci_write_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
- int ret;
-
- ret = mkaddr(bus->number, devfn, where);
- if (ret)
- return ret;
+ if (mkaddr(bus, devfn, where))
+ return PCIBIOS_DEVICE_NOT_FOUND;
switch (size) {
case 1:
@@ -117,11 +114,6 @@
tx3927_pcicptr->icd = cpu_to_le32(val);
}
- if (tx3927_pcicptr->pcistat & PCI_STATUS_REC_MASTER_ABORT)
- tx3927_pcicptr->pcistat |= PCI_STATUS_REC_MASTER_ABORT;
- tx3927_pcicptr->pcistatim |= PCI_STATUS_REC_MASTER_ABORT;
- return PCIBIOS_DEVICE_NOT_FOUND;
-
return check_abort();
}