1 files changed, 89 insertions, 0 deletions
diff --git a/arch/mips/pci/ops-sni.c b/arch/mips/pci/ops-sni.c
new file mode 100644
index 000000000000..62bdd19c7f8e
--- /dev/null
+++ b/arch/mips/pci/ops-sni.c
@@ -0,0 +1,89 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * SNI specific PCI support for RM200/RM300.
+ *
+ * Copyright (C) 1997 - 2000, 2003 Ralf Baechle <ralf@linux-mips.org>
+ */
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+#include <asm/sni.h>
+
+/*
+ * It seems that on the RM200 only lower 3 bits of the 5 bit PCI device
+ * address are decoded.  We therefore manually have to reject attempts at
+ * reading outside this range.  Being on the paranoid side we only do this
+ * test for bus 0 and hope forwarding and decoding work properly for any
+ * subordinated busses.
+ *
+ * ASIC PCI only supports type 1 config cycles.
+ */
+static int set_config_address(unsigned int busno, unsigned int devfn, int reg)
+{
+	if ((devfn > 255) || (reg > 255))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	if (busno == 0 && devfn >= PCI_DEVFN(8, 0))
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	*(volatile u32 *)PCIMT_CONFIG_ADDRESS =
+		 ((busno    & 0xff) << 16) |
+	         ((devfn    & 0xff) <<  8) |
+	          (reg      & 0xfc);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int pcimt_read(struct pci_bus *bus, unsigned int devfn, int reg,
+		      int size, u32 * val)
+{
+	int res;
+
+	if ((res = set_config_address(bus->number, devfn, reg)))
+		return res;
+
+	switch (size) {
+	case 1:
+		*val = *(volatile  u8 *) (PCIMT_CONFIG_DATA + (reg & 3));
+		break;
+	case 2:
+		*val = *(volatile u16 *) (PCIMT_CONFIG_DATA + (reg & 2));
+		break;
+	case 4:
+		*val = *(volatile u32 *) PCIMT_CONFIG_DATA;
+		break;
+	}
+
+	return 0;
+}
+
+static int pcimt_write(struct pci_bus *bus, unsigned int devfn, int reg,
+		       int size, u32 val)
+{
+	int res;
+
+	if ((res = set_config_address(bus->number, devfn, reg)))
+		return res;
+
+	switch (size) {
+	case 1:
+		*(volatile  u8 *) (PCIMT_CONFIG_DATA + (reg & 3)) = val;
+		break;
+	case 2:
+		*(volatile u16 *) (PCIMT_CONFIG_DATA + (reg & 2)) = val;
+		break;
+	case 4:
+		*(volatile u32 *) PCIMT_CONFIG_DATA = val;
+		break;
+	}
+
+	return 0;
+}
+
+struct pci_ops sni_pci_ops = {
+	.read = pcimt_read,
+	.write = pcimt_write,
+};