1 files changed, 113 insertions, 0 deletions
diff --git a/arch/mips/pci/ops-vr41xx.c b/arch/mips/pci/ops-vr41xx.c
new file mode 100644
index 000000000..7b7709aa1
--- /dev/null
+++ b/arch/mips/pci/ops-vr41xx.c
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  ops-vr41xx.c, PCI configuration routines for the PCIU of NEC VR4100 series.
+ *
+ *  Copyright (C) 2001-2003 MontaVista Software Inc.
+ *    Author: Yoichi Yuasa <source@mvista.com>
+ *  Copyright (C) 2004-2005  Yoichi Yuasa <yuasa@linux-mips.org>
+ */
+/*
+ * Changes:
+ *  MontaVista Software Inc. <source@mvista.com>
+ *  - New creation, NEC VR4122 and VR4131 are supported.
+ */
+#include <linux/pci.h>
+#include <linux/types.h>
+
+#include <asm/io.h>
+
+#define PCICONFDREG	(void __iomem *)KSEG1ADDR(0x0f000c14)
+#define PCICONFAREG	(void __iomem *)KSEG1ADDR(0x0f000c18)
+
+static inline int set_pci_configuration_address(unsigned char number,
+						unsigned int devfn, int where)
+{
+	if (number == 0) {
+		/*
+		 * Type 0 configuration
+		 */
+		if (PCI_SLOT(devfn) < 11 || where > 0xff)
+			return -EINVAL;
+
+		writel((1U << PCI_SLOT(devfn)) | (PCI_FUNC(devfn) << 8) |
+		       (where & 0xfc), PCICONFAREG);
+	} else {
+		/*
+		 * Type 1 configuration
+		 */
+		if (where > 0xff)
+			return -EINVAL;
+
+		writel(((uint32_t)number << 16) | ((devfn & 0xff) << 8) |
+		       (where & 0xfc) | 1U, PCICONFAREG);
+	}
+
+	return 0;
+}
+
+static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
+			   int size, uint32_t *val)
+{
+	uint32_t data;
+
+	*val = 0xffffffffU;
+	if (set_pci_configuration_address(bus->number, devfn, where) < 0)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	data = readl(PCICONFDREG);
+
+	switch (size) {
+	case 1:
+		*val = (data >> ((where & 3) << 3)) & 0xffU;
+		break;
+	case 2:
+		*val = (data >> ((where & 2) << 3)) & 0xffffU;
+		break;
+	case 4:
+		*val = data;
+		break;
+	default:
+		return PCIBIOS_FUNC_NOT_SUPPORTED;
+	}
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
+			    int size, uint32_t val)
+{
+	uint32_t data;
+	int shift;
+
+	if (set_pci_configuration_address(bus->number, devfn, where) < 0)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	data = readl(PCICONFDREG);
+
+	switch (size) {
+	case 1:
+		shift = (where & 3) << 3;
+		data &= ~(0xffU << shift);
+		data |= ((val & 0xffU) << shift);
+		break;
+	case 2:
+		shift = (where & 2) << 3;
+		data &= ~(0xffffU << shift);
+		data |= ((val & 0xffffU) << shift);
+		break;
+	case 4:
+		data = val;
+		break;
+	default:
+		return PCIBIOS_FUNC_NOT_SUPPORTED;
+	}
+
+	writel(data, PCICONFDREG);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops vr41xx_pci_ops = {
+	.read	= pci_config_read,
+	.write	= pci_config_write,
+};