[MIPS] IP27: misc fixes

- fix PCI interrupt assignment by emulating ioc3 interrupt pin register
- use pci_probe_only mode
- select correct page size in bridge
- remove no longer needed ioc3_sio_init() code

[Ralf: Fix for 64kB or larger pagesizes]
Signed-off-by: NThomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/pci/ops-bridge.c

@@ -13,6 +13,22 @@
 #include <asm/sn/intr.h>
 #include <asm/sn/sn0/hub.h>
 
+/*
+ * Most of the IOC3 PCI config register aren't present
+ * we emulate what is needed for a normal PCI enumeration
+ */
+static u32 emulate_ioc3_cfg(int where, int size)
+{
+	if (size == 1 && where == 0x3d)
+		return 0x01;
+	else if (size == 2 && where == 0x3c)
+		return 0x0100;
+	else if (size == 4 && where == 0x3c)
+		return 0x00000100;
+
+	return 0;
+}
+
 /*
  * The Bridge ASIC supports both type 0 and type 1 access.  Type 1 is
  * not really documented, so right now I can't write code which uses it.
@@ -64,7 +80,7 @@ static int pci_conf0_read_config(struct pci_bus *bus, unsigned int devfn,
 	 * generic PCI code a chance to look at the wrong register.
 	 */
 	if ((where >= 0x14 && where < 0x40) || (where >= 0x48)) {
-		*value = 0;
+		*value = emulate_ioc3_cfg(where, size);
 		return PCIBIOS_SUCCESSFUL;
 	}
 
@@ -127,7 +143,7 @@ static int pci_conf1_read_config(struct pci_bus *bus, unsigned int devfn,
 	 * generic PCI code a chance to look at the wrong register.
 	 */
 	if ((where >= 0x14 && where < 0x40) || (where >= 0x48)) {
-		*value = 0;
+		*value = emulate_ioc3_cfg(where, size);
 		return PCIBIOS_SUCCESSFUL;
 	}
 

arch/mips/pci/pci-ip27.c

@@ -47,6 +47,9 @@ int __cpuinit bridge_probe(nasid_t nasid, int widget_id, int masterwid)
 	static int num_bridges = 0;
 	bridge_t *bridge;
 	int slot;
+	extern int pci_probe_only;
+
+	pci_probe_only = 1;
 
 	printk("a bridge\n");
 
@@ -100,6 +103,11 @@ int __cpuinit bridge_probe(nasid_t nasid, int widget_id, int masterwid)
 	 */
 	bridge->b_wid_control |= BRIDGE_CTRL_IO_SWAP |
 	                         BRIDGE_CTRL_MEM_SWAP;
+#ifdef CONFIG_PAGE_SIZE_4KB
+	bridge->b_wid_control &= ~BRIDGE_CTRL_PAGE_SIZE;
+#else /* 16kB or larger */
+	bridge->b_wid_control |= BRIDGE_CTRL_PAGE_SIZE;
+#endif
 
 	/*
 	 * Hmm...  IRIX sets additional bits in the address which

arch/mips/sgi-ip27/ip27-init.c

@@ -161,27 +161,6 @@ cnodeid_t get_compact_nodeid(void)
 	return NASID_TO_COMPACT_NODEID(get_nasid());
 }
 
-/* Extracted from the IOC3 meta driver.  FIXME.  */
-static inline void ioc3_sio_init(void)
-{
-	struct ioc3 *ioc3;
-	nasid_t nid;
-	long loops;
-
-	nid = get_nasid();
-	ioc3 = (struct ioc3 *) KL_CONFIG_CH_CONS_INFO(nid)->memory_base;
-
-	ioc3->sscr_a = 0;			/* PIO mode for uarta.  */
-	ioc3->sscr_b = 0;			/* PIO mode for uartb.  */
-	ioc3->sio_iec = ~0;
-	ioc3->sio_ies = (SIO_IR_SA_INT | SIO_IR_SB_INT);
-
-	loops=1000000; while(loops--);
-	ioc3->sregs.uarta.iu_fcr = 0;
-	ioc3->sregs.uartb.iu_fcr = 0;
-	loops=1000000; while(loops--);
-}
-
 static inline void ioc3_eth_init(void)
 {
 	struct ioc3 *ioc3;
@@ -234,7 +213,6 @@ void __init plat_mem_setup(void)
 		panic("Kernel compiled for N mode.");
 #endif
 
-	ioc3_sio_init();
 	ioc3_eth_init();
 	per_cpu_init();