1 files changed, 148 insertions, 0 deletions
diff --git a/arch/mips/pci/ops-bonito64.c b/arch/mips/pci/ops-bonito64.c
new file mode 100644
index 000000000..4d5fe614f
--- /dev/null
+++ b/arch/mips/pci/ops-bonito64.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 1999, 2000, 2004  MIPS Technologies, Inc.
+ *	All rights reserved.
+ *	Authors: Carsten Langgaard <carstenl@mips.com>
+ *		 Maciej W. Rozycki <macro@mips.com>
+ *
+ * MIPS boards specific PCI support.
+ */
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+
+#include <asm/mips-boards/bonito64.h>
+
+#define PCI_ACCESS_READ	 0
+#define PCI_ACCESS_WRITE 1
+
+#define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(_pcictrl_bonito_pcicfg + (offset))
+#define ID_SEL_BEGIN 10
+#define MAX_DEV_NUM (31 - ID_SEL_BEGIN)
+
+
+static int bonito64_pcibios_config_access(unsigned char access_type,
+				      struct pci_bus *bus,
+				      unsigned int devfn, int where,
+				      u32 * data)
+{
+	u32 busnum = bus->number;
+	u32 addr, type;
+	u32 dummy;
+	void *addrp;
+	int device = PCI_SLOT(devfn);
+	int function = PCI_FUNC(devfn);
+	int reg = where & ~3;
+
+	if (busnum == 0) {
+		/* Type 0 configuration for onboard PCI bus */
+		if (device > MAX_DEV_NUM)
+			return -1;
+
+		addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg;
+		type = 0;
+	} else {
+		/* Type 1 configuration for offboard PCI bus */
+		addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
+		type = 0x10000;
+	}
+
+	/* Clear aborts */
+	BONITO_PCICMD |= BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR;
+
+	BONITO_PCIMAP_CFG = (addr >> 16) | type;
+
+	/* Flush Bonito register block */
+	dummy = BONITO_PCIMAP_CFG;
+	mmiowb();
+
+	addrp = CFG_SPACE_REG(addr & 0xffff);
+	if (access_type == PCI_ACCESS_WRITE) {
+		writel(cpu_to_le32(*data), addrp);
+		/* Wait till done */
+		while (BONITO_PCIMSTAT & 0xF);
+	} else {
+		*data = le32_to_cpu(readl(addrp));
+	}
+
+	/* Detect Master/Target abort */
+	if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR |
+			     BONITO_PCICMD_MTABORT_CLR)) {
+		/* Error occurred */
+
+		/* Clear bits */
+		BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
+				  BONITO_PCICMD_MTABORT_CLR);
+
+		return -1;
+	}
+
+	return 0;
+
+}
+
+
+/*
+ * We can't address 8 and 16 bit words directly.  Instead we have to
+ * read/write a 32bit word and mask/modify the data we actually want.
+ */
+static int bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn,
+			     int where, int size, u32 * val)
+{
+	u32 data = 0;
+
+	if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
+				       &data))
+		return -1;
+
+	if (size == 1)
+		*val = (data >> ((where & 3) << 3)) & 0xff;
+	else if (size == 2)
+		*val = (data >> ((where & 3) << 3)) & 0xffff;
+	else
+		*val = data;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn,
+			      int where, int size, u32 val)
+{
+	u32 data = 0;
+
+	if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	if (size == 4)
+		data = val;
+	else {
+		if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
+					       where, &data))
+			return -1;
+
+		if (size == 1)
+			data = (data & ~(0xff << ((where & 3) << 3))) |
+				(val << ((where & 3) << 3));
+		else if (size == 2)
+			data = (data & ~(0xffff << ((where & 3) << 3))) |
+				(val << ((where & 3) << 3));
+	}
+
+	if (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
+				       &data))
+		return -1;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops bonito64_pci_ops = {
+	.read = bonito64_pcibios_read,
+	.write = bonito64_pcibios_write
+};