[MIPS] Support for several more SNI RM models.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 76 insertions, 1 deletions

diff --git a/arch/mips/pci/ops-sni.c b/arch/mips/pci/ops-sni.c
index 2b0ccd6d9dcd..fa2d2c60f797 100644
--- a/arch/mips/pci/ops-sni.c
+++ b/arch/mips/pci/ops-sni.c
@@ -83,7 +83,82 @@ static int pcimt_write(struct pci_bus *bus, unsigned int devfn, int reg,
 	return 0;
 }
 
-struct pci_ops sni_pci_ops = {
+struct pci_ops sni_pcimt_ops = {
 	.read = pcimt_read,
 	.write = pcimt_write,
 };
+
+static int pcit_set_config_address(unsigned int busno, unsigned int devfn, int reg)
+{
+	if ((devfn > 255) || (reg > 255) || (busno > 255))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	outl ((1 << 31) | ((busno & 0xff) << 16) | ((devfn & 0xff) << 8) | (reg & 0xfc), 0xcf8);
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int pcit_read(struct pci_bus *bus, unsigned int devfn, int reg,
+		      int size, u32 * val)
+{
+	int res;
+
+	/*
+	 * on bus 0 we need to check, whether there is a device answering
+	 * for the devfn by doing a config write and checking the result. If
+	 * we don't do it, we will get a data bus error
+	 */
+	if (bus->number == 0) {
+		pcit_set_config_address (0, 0, 0x68);
+		outl (inl (0xcfc) | 0xc0000000, 0xcfc);
+		if ((res = pcit_set_config_address(0, devfn, 0)))
+			return res;
+		outl (0xffffffff, 0xcfc);
+		pcit_set_config_address (0, 0, 0x68);
+		if (inl(0xcfc) & 0x100000)
+			return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+	if ((res = pcit_set_config_address(bus->number, devfn, reg)))
+		return res;
+
+	switch (size) {
+	case 1:
+		*val = inb(PCIMT_CONFIG_DATA + (reg & 3));
+		break;
+	case 2:
+		*val = inw(PCIMT_CONFIG_DATA + (reg & 2));
+		break;
+	case 4:
+		*val = inl(PCIMT_CONFIG_DATA);
+		break;
+	}
+	return 0;
+}
+
+static int pcit_write(struct pci_bus *bus, unsigned int devfn, int reg,
+		       int size, u32 val)
+{
+	int res;
+
+	if ((res = pcit_set_config_address(bus->number, devfn, reg)))
+		return res;
+
+	switch (size) {
+	case 1:
+		outb (val, PCIMT_CONFIG_DATA + (reg & 3));
+		break;
+	case 2:
+		outw (val, PCIMT_CONFIG_DATA + (reg & 2));
+		break;
+	case 4:
+		outl (val, PCIMT_CONFIG_DATA);
+		break;
+	}
+
+	return 0;
+}
+
+
+struct pci_ops sni_pcit_ops = {
+	.read = pcit_read,
+	.write = pcit_write,
+};