1 files changed, 213 insertions, 0 deletions
diff --git a/arch/mips/pci/ops-loongson2.c b/arch/mips/pci/ops-loongson2.c
new file mode 100644
index 000000000..0d1b36ba1
--- /dev/null
+++ b/arch/mips/pci/ops-loongson2.c
@@ -0,0 +1,213 @@
+// 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>
+ *
+ * Copyright (C) 2009 Lemote Inc.
+ * Author: Wu Zhangjin <wuzhangjin@gmail.com>
+ */
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+
+#include <loongson.h>
+
+#ifdef CONFIG_CS5536
+#include <cs5536/cs5536_pci.h>
+#include <cs5536/cs5536.h>
+#endif
+
+#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) {
+		/* board-specific part,currently,only fuloong2f,yeeloong2f
+		 * use CS5536, fuloong2e use via686b, gdium has no
+		 * south bridge
+		 */
+#ifdef CONFIG_CS5536
+		/* cs5536_pci_conf_read4/write4() will call _rdmsr/_wrmsr() to
+		 * access the regsters PCI_MSR_ADDR, PCI_MSR_DATA_LO,
+		 * PCI_MSR_DATA_HI, which is bigger than PCI_MSR_CTRL, so, it
+		 * will not go this branch, but the others. so, no calling dead
+		 * loop here.
+		 */
+		if ((PCI_IDSEL_CS5536 == device) && (reg < PCI_MSR_CTRL)) {
+			switch (access_type) {
+			case PCI_ACCESS_READ:
+				*data = cs5536_pci_conf_read4(function, reg);
+				break;
+			case PCI_ACCESS_WRITE:
+				cs5536_pci_conf_write4(function, reg, *data);
+				break;
+			}
+			return 0;
+		}
+#endif
+		/* 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
+};
+
+#ifdef CONFIG_CS5536
+DEFINE_RAW_SPINLOCK(msr_lock);
+
+void _rdmsr(u32 msr, u32 *hi, u32 *lo)
+{
+	struct pci_bus bus = {
+		.number = PCI_BUS_CS5536
+	};
+	u32 devfn = PCI_DEVFN(PCI_IDSEL_CS5536, 0);
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&msr_lock, flags);
+	loongson_pcibios_write(&bus, devfn, PCI_MSR_ADDR, 4, msr);
+	loongson_pcibios_read(&bus, devfn, PCI_MSR_DATA_LO, 4, lo);
+	loongson_pcibios_read(&bus, devfn, PCI_MSR_DATA_HI, 4, hi);
+	raw_spin_unlock_irqrestore(&msr_lock, flags);
+}
+EXPORT_SYMBOL(_rdmsr);
+
+void _wrmsr(u32 msr, u32 hi, u32 lo)
+{
+	struct pci_bus bus = {
+		.number = PCI_BUS_CS5536
+	};
+	u32 devfn = PCI_DEVFN(PCI_IDSEL_CS5536, 0);
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&msr_lock, flags);
+	loongson_pcibios_write(&bus, devfn, PCI_MSR_ADDR, 4, msr);
+	loongson_pcibios_write(&bus, devfn, PCI_MSR_DATA_LO, 4, lo);
+	loongson_pcibios_write(&bus, devfn, PCI_MSR_DATA_HI, 4, hi);
+	raw_spin_unlock_irqrestore(&msr_lock, flags);
+}
+EXPORT_SYMBOL(_wrmsr);
+#endif