MIPS: Bonito64: Make Loongson independent from Bonito64 code.

The built-in Loongson 2E/2F northbridge in is bonito64-compatible but not
identical with it.  To avoid influencing the original bonito64 support and
make the loongson support more maintainable, it's better to separate the
Bonito64 code from the Loongson code.

This also prepares the kernel for the coming Loongson 2f machines family
support.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Linux-MIPS <linux-mips@linux-mips.org>
Cc: yanh@lemote.com
Cc: huhb@lemote.com
Cc: Zhang Le <r0bertz@gentoo.org>
Cc: zhangfx@lemote.com,
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 154 insertions, 0 deletions

diff --git a/arch/mips/pci/ops-fuloong2e.c b/arch/mips/pci/ops-fuloong2e.c
new file mode 100644
index 000000000000..171f65c99ca1
--- /dev/null
+++ b/arch/mips/pci/ops-fuloong2e.c
@@ -0,0 +1,154 @@
+/*
+ * fuloong2e specific PCI support.
+ *
+ * Copyright (C) 1999, 2000, 2004  MIPS Technologies, Inc.
+ *	All rights reserved.
+ *	Authors: Carsten Langgaard <carstenl@mips.com>
+ *		 Maciej W. Rozycki <macro@mips.com>
+ *
+ * Copyright (C) 2009 Lemote Inc.
+ * Author: Wu Zhangjin <wuzj@lemote.com>
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ */
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <loongson.h>
+
+#define PCI_ACCESS_READ  0
+#define PCI_ACCESS_WRITE 1
+
+#define CFG_SPACE_REG(offset) \
+	(void *)CKSEG1ADDR(LOONGSON_PCICFG_BASE | (offset))
+#define ID_SEL_BEGIN 11
+#define MAX_DEV_NUM (31 - ID_SEL_BEGIN)
+
+
+static int loongson_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 */
+	LOONGSON_PCICMD |= LOONGSON_PCICMD_MABORT_CLR | \
+				LOONGSON_PCICMD_MTABORT_CLR;
+
+	LOONGSON_PCIMAP_CFG = (addr >> 16) | type;
+
+	/* Flush Bonito register block */
+	dummy = LOONGSON_PCIMAP_CFG;
+	mmiowb();
+
+	addrp = CFG_SPACE_REG(addr & 0xffff);
+	if (access_type == PCI_ACCESS_WRITE)
+		writel(cpu_to_le32(*data), addrp);
+	else
+		*data = le32_to_cpu(readl(addrp));
+
+	/* Detect Master/Target abort */
+	if (LOONGSON_PCICMD & (LOONGSON_PCICMD_MABORT_CLR |
+			     LOONGSON_PCICMD_MTABORT_CLR)) {
+		/* Error occurred */
+
+		/* Clear bits */
+		LOONGSON_PCICMD |= (LOONGSON_PCICMD_MABORT_CLR |
+				  LOONGSON_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 loongson_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 (loongson_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 loongson_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 (loongson_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 (loongson_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
+				       &data))
+		return -1;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops loongson_pci_ops = {
+	.read = loongson_pcibios_read,
+	.write = loongson_pcibios_write
+};