[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>

2 files changed, 53 insertions, 27 deletions

diff --git a/arch/mips/pci/ops-tx3927.c b/arch/mips/pci/ops-tx3927.c
index 8a17a39e5bf2..c6bd79e71e26 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_read_config(struct pci_bus *bus, unsigned int devfn,
 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 @@ static int tx3927_pci_write_config(struct pci_bus *bus, unsigned int devfn,
                 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();
 }
 
diff --git a/arch/mips/pci/ops-tx4927.c b/arch/mips/pci/ops-tx4927.c
index c6b49bccd274..6d844094ef5d 100644
--- a/arch/mips/pci/ops-tx4927.c
+++ b/arch/mips/pci/ops-tx4927.c
@@ -85,6 +85,8 @@ static int check_abort(struct tx4927_pcic_reg __iomem *pcicptr)
                 __raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff)
                              | (PCI_STATUS_REC_MASTER_ABORT << 16),
                              &pcicptr->pcistatus);
+                /* flush write buffer */
+                iob();
                 code = PCIBIOS_DEVICE_NOT_FOUND;
         }
         return code;
@@ -406,3 +408,35 @@ void tx4927_report_pcic_status(void)
                         tx4927_report_pcic_status1(pcicptrs[i].pcicptr);
         }
 }
+
+#ifdef CONFIG_TOSHIBA_FPCIB0
+static void __init tx4927_quirk_slc90e66_bridge(struct pci_dev *dev)
+{
+        struct tx4927_pcic_reg __iomem *pcicptr = pci_bus_to_pcicptr(dev->bus);
+
+        if (!pcicptr)
+                return;
+        if (__raw_readl(&pcicptr->pbacfg) & TX4927_PCIC_PBACFG_PBAEN) {
+                /* Reset Bus Arbiter */
+                __raw_writel(TX4927_PCIC_PBACFG_RPBA, &pcicptr->pbacfg);
+                /*
+                 * swap reqBP and reqXP (raise priority of SLC90E66).
+                 * SLC90E66(PCI-ISA bridge) is connected to REQ2 on
+                 * PCI Backplane board.
+                 */
+                __raw_writel(0x72543610, &pcicptr->pbareqport);
+                __raw_writel(0, &pcicptr->pbabm);
+                /* Use Fixed ParkMaster (required by SLC90E66) */
+                __raw_writel(TX4927_PCIC_PBACFG_FIXPA, &pcicptr->pbacfg);
+                /* Enable Bus Arbiter */
+                __raw_writel(TX4927_PCIC_PBACFG_FIXPA |
+                             TX4927_PCIC_PBACFG_PBAEN,
+                             &pcicptr->pbacfg);
+                printk(KERN_INFO "PCI: Use Fixed Park Master (REQPORT %08x)\n",
+                       __raw_readl(&pcicptr->pbareqport));
+        }
+}
+#define PCI_DEVICE_ID_EFAR_SLC90E66_0 0x9460
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_0,
+        tx4927_quirk_slc90e66_bridge);
+#endif