Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 1250 insertions, 0 deletions

diff --git a/arch/mips/loongson2ef/common/cs5536/Makefile b/arch/mips/loongson2ef/common/cs5536/Makefile
new file mode 100644
index 000000000..b32b29661
--- /dev/null
+++ b/arch/mips/loongson2ef/common/cs5536/Makefile
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for CS5536 support.
+#
+
+obj-$(CONFIG_CS5536) += cs5536_pci.o cs5536_ide.o cs5536_acc.o cs5536_ohci.o \
+			cs5536_isa.o cs5536_ehci.o
+
+#
+# Enable cs5536 mfgpt Timer
+#
+obj-$(CONFIG_CS5536_MFGPT) += cs5536_mfgpt.o
diff --git a/arch/mips/loongson2ef/common/cs5536/cs5536_acc.c b/arch/mips/loongson2ef/common/cs5536/cs5536_acc.c
new file mode 100644
index 000000000..ff50aae72
--- /dev/null
+++ b/arch/mips/loongson2ef/common/cs5536/cs5536_acc.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * the ACC Virtual Support Module of AMD CS5536
+ *
+ * Copyright (C) 2007 Lemote, Inc.
+ * Author : jlliu, liujl@lemote.com
+ *
+ * Copyright (C) 2009 Lemote, Inc.
+ * Author: Wu Zhangjin, wuzhangjin@gmail.com
+ */
+
+#include <cs5536/cs5536.h>
+#include <cs5536/cs5536_pci.h>
+
+void pci_acc_write_reg(int reg, u32 value)
+{
+	u32 hi = 0, lo = value;
+
+	switch (reg) {
+	case PCI_COMMAND:
+		_rdmsr(GLIU_MSR_REG(GLIU_PAE), &hi, &lo);
+		if (value & PCI_COMMAND_MASTER)
+			lo |= (0x03 << 8);
+		else
+			lo &= ~(0x03 << 8);
+		_wrmsr(GLIU_MSR_REG(GLIU_PAE), hi, lo);
+		break;
+	case PCI_STATUS:
+		if (value & PCI_STATUS_PARITY) {
+			_rdmsr(SB_MSR_REG(SB_ERROR), &hi, &lo);
+			if (lo & SB_PARE_ERR_FLAG) {
+				lo = (lo & 0x0000ffff) | SB_PARE_ERR_FLAG;
+				_wrmsr(SB_MSR_REG(SB_ERROR), hi, lo);
+			}
+		}
+		break;
+	case PCI_BAR0_REG:
+		if (value == PCI_BAR_RANGE_MASK) {
+			_rdmsr(GLCP_MSR_REG(GLCP_SOFT_COM), &hi, &lo);
+			lo |= SOFT_BAR_ACC_FLAG;
+			_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
+		} else if (value & 0x01) {
+			value &= 0xfffffffc;
+			hi = 0xA0000000 | ((value & 0x000ff000) >> 12);
+			lo = 0x000fff80 | ((value & 0x00000fff) << 20);
+			_wrmsr(GLIU_MSR_REG(GLIU_IOD_BM1), hi, lo);
+		}
+		break;
+	case PCI_ACC_INT_REG:
+		_rdmsr(DIVIL_MSR_REG(PIC_YSEL_LOW), &hi, &lo);
+		/* disable all the usb interrupt in PIC */
+		lo &= ~(0xf << PIC_YSEL_LOW_ACC_SHIFT);
+		if (value)	/* enable all the acc interrupt in PIC */
+			lo |= (CS5536_ACC_INTR << PIC_YSEL_LOW_ACC_SHIFT);
+		_wrmsr(DIVIL_MSR_REG(PIC_YSEL_LOW), hi, lo);
+		break;
+	default:
+		break;
+	}
+}
+
+u32 pci_acc_read_reg(int reg)
+{
+	u32 hi, lo;
+	u32 conf_data = 0;
+
+	switch (reg) {
+	case PCI_VENDOR_ID:
+		conf_data =
+		    CFG_PCI_VENDOR_ID(CS5536_ACC_DEVICE_ID, CS5536_VENDOR_ID);
+		break;
+	case PCI_COMMAND:
+		_rdmsr(GLIU_MSR_REG(GLIU_IOD_BM1), &hi, &lo);
+		if (((lo & 0xfff00000) || (hi & 0x000000ff))
+		    && ((hi & 0xf0000000) == 0xa0000000))
+			conf_data |= PCI_COMMAND_IO;
+		_rdmsr(GLIU_MSR_REG(GLIU_PAE), &hi, &lo);
+		if ((lo & 0x300) == 0x300)
+			conf_data |= PCI_COMMAND_MASTER;
+		break;
+	case PCI_STATUS:
+		conf_data |= PCI_STATUS_66MHZ;
+		conf_data |= PCI_STATUS_FAST_BACK;
+		_rdmsr(SB_MSR_REG(SB_ERROR), &hi, &lo);
+		if (lo & SB_PARE_ERR_FLAG)
+			conf_data |= PCI_STATUS_PARITY;
+		conf_data |= PCI_STATUS_DEVSEL_MEDIUM;
+		break;
+	case PCI_CLASS_REVISION:
+		_rdmsr(ACC_MSR_REG(ACC_CAP), &hi, &lo);
+		conf_data = lo & 0x000000ff;
+		conf_data |= (CS5536_ACC_CLASS_CODE << 8);
+		break;
+	case PCI_CACHE_LINE_SIZE:
+		conf_data =
+		    CFG_PCI_CACHE_LINE_SIZE(PCI_NORMAL_HEADER_TYPE,
+					    PCI_NORMAL_LATENCY_TIMER);
+		break;
+	case PCI_BAR0_REG:
+		_rdmsr(GLCP_MSR_REG(GLCP_SOFT_COM), &hi, &lo);
+		if (lo & SOFT_BAR_ACC_FLAG) {
+			conf_data = CS5536_ACC_RANGE |
+			    PCI_BASE_ADDRESS_SPACE_IO;
+			lo &= ~SOFT_BAR_ACC_FLAG;
+			_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
+		} else {
+			_rdmsr(GLIU_MSR_REG(GLIU_IOD_BM1), &hi, &lo);
+			conf_data = (hi & 0x000000ff) << 12;
+			conf_data |= (lo & 0xfff00000) >> 20;
+			conf_data |= 0x01;
+			conf_data &= ~0x02;
+		}
+		break;
+	case PCI_CARDBUS_CIS:
+		conf_data = PCI_CARDBUS_CIS_POINTER;
+		break;
+	case PCI_SUBSYSTEM_VENDOR_ID:
+		conf_data =
+		    CFG_PCI_VENDOR_ID(CS5536_ACC_SUB_ID, CS5536_SUB_VENDOR_ID);
+		break;
+	case PCI_ROM_ADDRESS:
+		conf_data = PCI_EXPANSION_ROM_BAR;
+		break;
+	case PCI_CAPABILITY_LIST:
+		conf_data = PCI_CAPLIST_USB_POINTER;
+		break;
+	case PCI_INTERRUPT_LINE:
+		conf_data =
+		    CFG_PCI_INTERRUPT_LINE(PCI_DEFAULT_PIN, CS5536_ACC_INTR);
+		break;
+	default:
+		break;
+	}
+
+	return conf_data;
+}
diff --git a/arch/mips/loongson2ef/common/cs5536/cs5536_ehci.c b/arch/mips/loongson2ef/common/cs5536/cs5536_ehci.c
new file mode 100644
index 000000000..bd4c39fe6
--- /dev/null
+++ b/arch/mips/loongson2ef/common/cs5536/cs5536_ehci.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * the EHCI Virtual Support Module of AMD CS5536
+ *
+ * Copyright (C) 2007 Lemote, Inc.
+ * Author : jlliu, liujl@lemote.com
+ *
+ * Copyright (C) 2009 Lemote, Inc.
+ * Author: Wu Zhangjin, wuzhangjin@gmail.com
+ */
+
+#include <cs5536/cs5536.h>
+#include <cs5536/cs5536_pci.h>
+
+void pci_ehci_write_reg(int reg, u32 value)
+{
+	u32 hi = 0, lo = value;
+
+	switch (reg) {
+	case PCI_COMMAND:
+		_rdmsr(USB_MSR_REG(USB_EHCI), &hi, &lo);
+		if (value & PCI_COMMAND_MASTER)
+			hi |= PCI_COMMAND_MASTER;
+		else
+			hi &= ~PCI_COMMAND_MASTER;
+
+		if (value & PCI_COMMAND_MEMORY)
+			hi |= PCI_COMMAND_MEMORY;
+		else
+			hi &= ~PCI_COMMAND_MEMORY;
+		_wrmsr(USB_MSR_REG(USB_EHCI), hi, lo);
+		break;
+	case PCI_STATUS:
+		if (value & PCI_STATUS_PARITY) {
+			_rdmsr(SB_MSR_REG(SB_ERROR), &hi, &lo);
+			if (lo & SB_PARE_ERR_FLAG) {
+				lo = (lo & 0x0000ffff) | SB_PARE_ERR_FLAG;
+				_wrmsr(SB_MSR_REG(SB_ERROR), hi, lo);
+			}
+		}
+		break;
+	case PCI_BAR0_REG:
+		if (value == PCI_BAR_RANGE_MASK) {
+			_rdmsr(GLCP_MSR_REG(GLCP_SOFT_COM), &hi, &lo);
+			lo |= SOFT_BAR_EHCI_FLAG;
+			_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
+		} else if ((value & 0x01) == 0x00) {
+			_rdmsr(USB_MSR_REG(USB_EHCI), &hi, &lo);
+			lo = value;
+			_wrmsr(USB_MSR_REG(USB_EHCI), hi, lo);
+
+			value &= 0xfffffff0;
+			hi = 0x40000000 | ((value & 0xff000000) >> 24);
+			lo = 0x000fffff | ((value & 0x00fff000) << 8);
+			_wrmsr(GLIU_MSR_REG(GLIU_P2D_BM4), hi, lo);
+		}
+		break;
+	case PCI_EHCI_LEGSMIEN_REG:
+		_rdmsr(USB_MSR_REG(USB_EHCI), &hi, &lo);
+		hi &= 0x003f0000;
+		hi |= (value & 0x3f) << 16;
+		_wrmsr(USB_MSR_REG(USB_EHCI), hi, lo);
+		break;
+	case PCI_EHCI_FLADJ_REG:
+		_rdmsr(USB_MSR_REG(USB_EHCI), &hi, &lo);
+		hi &= ~0x00003f00;
+		hi |= value & 0x00003f00;
+		_wrmsr(USB_MSR_REG(USB_EHCI), hi, lo);
+		break;
+	default:
+		break;
+	}
+}
+
+u32 pci_ehci_read_reg(int reg)
+{
+	u32 conf_data = 0;
+	u32 hi, lo;
+
+	switch (reg) {
+	case PCI_VENDOR_ID:
+		conf_data =
+		    CFG_PCI_VENDOR_ID(CS5536_EHCI_DEVICE_ID, CS5536_VENDOR_ID);
+		break;
+	case PCI_COMMAND:
+		_rdmsr(USB_MSR_REG(USB_EHCI), &hi, &lo);
+		if (hi & PCI_COMMAND_MASTER)
+			conf_data |= PCI_COMMAND_MASTER;
+		if (hi & PCI_COMMAND_MEMORY)
+			conf_data |= PCI_COMMAND_MEMORY;
+		break;
+	case PCI_STATUS:
+		conf_data |= PCI_STATUS_66MHZ;
+		conf_data |= PCI_STATUS_FAST_BACK;
+		_rdmsr(SB_MSR_REG(SB_ERROR), &hi, &lo);
+		if (lo & SB_PARE_ERR_FLAG)
+			conf_data |= PCI_STATUS_PARITY;
+		conf_data |= PCI_STATUS_DEVSEL_MEDIUM;
+		break;
+	case PCI_CLASS_REVISION:
+		_rdmsr(USB_MSR_REG(USB_CAP), &hi, &lo);
+		conf_data = lo & 0x000000ff;
+		conf_data |= (CS5536_EHCI_CLASS_CODE << 8);
+		break;
+	case PCI_CACHE_LINE_SIZE:
+		conf_data =
+		    CFG_PCI_CACHE_LINE_SIZE(PCI_NORMAL_HEADER_TYPE,
+					    PCI_NORMAL_LATENCY_TIMER);
+		break;
+	case PCI_BAR0_REG:
+		_rdmsr(GLCP_MSR_REG(GLCP_SOFT_COM), &hi, &lo);
+		if (lo & SOFT_BAR_EHCI_FLAG) {
+			conf_data = CS5536_EHCI_RANGE |
+			    PCI_BASE_ADDRESS_SPACE_MEMORY;
+			lo &= ~SOFT_BAR_EHCI_FLAG;
+			_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
+		} else {
+			_rdmsr(USB_MSR_REG(USB_EHCI), &hi, &lo);
+			conf_data = lo & 0xfffff000;
+		}
+		break;
+	case PCI_CARDBUS_CIS:
+		conf_data = PCI_CARDBUS_CIS_POINTER;
+		break;
+	case PCI_SUBSYSTEM_VENDOR_ID:
+		conf_data =
+		    CFG_PCI_VENDOR_ID(CS5536_EHCI_SUB_ID, CS5536_SUB_VENDOR_ID);
+		break;
+	case PCI_ROM_ADDRESS:
+		conf_data = PCI_EXPANSION_ROM_BAR;
+		break;
+	case PCI_CAPABILITY_LIST:
+		conf_data = PCI_CAPLIST_USB_POINTER;
+		break;
+	case PCI_INTERRUPT_LINE:
+		conf_data =
+		    CFG_PCI_INTERRUPT_LINE(PCI_DEFAULT_PIN, CS5536_USB_INTR);
+		break;
+	case PCI_EHCI_LEGSMIEN_REG:
+		_rdmsr(USB_MSR_REG(USB_EHCI), &hi, &lo);
+		conf_data = (hi & 0x003f0000) >> 16;
+		break;
+	case PCI_EHCI_LEGSMISTS_REG:
+		_rdmsr(USB_MSR_REG(USB_EHCI), &hi, &lo);
+		conf_data = (hi & 0x3f000000) >> 24;
+		break;
+	case PCI_EHCI_FLADJ_REG:
+		_rdmsr(USB_MSR_REG(USB_EHCI), &hi, &lo);
+		conf_data = hi & 0x00003f00;
+		break;
+	default:
+		break;
+	}
+
+	return conf_data;
+}
diff --git a/arch/mips/loongson2ef/common/cs5536/cs5536_ide.c b/arch/mips/loongson2ef/common/cs5536/cs5536_ide.c
new file mode 100644
index 000000000..bb933294b
--- /dev/null
+++ b/arch/mips/loongson2ef/common/cs5536/cs5536_ide.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * the IDE Virtual Support Module of AMD CS5536
+ *
+ * Copyright (C) 2007 Lemote, Inc.
+ * Author : jlliu, liujl@lemote.com
+ *
+ * Copyright (C) 2009 Lemote, Inc.
+ * Author: Wu Zhangjin, wuzhangjin@gmail.com
+ */
+
+#include <cs5536/cs5536.h>
+#include <cs5536/cs5536_pci.h>
+
+void pci_ide_write_reg(int reg, u32 value)
+{
+	u32 hi = 0, lo = value;
+
+	switch (reg) {
+	case PCI_COMMAND:
+		_rdmsr(GLIU_MSR_REG(GLIU_PAE), &hi, &lo);
+		if (value & PCI_COMMAND_MASTER)
+			lo |= (0x03 << 4);
+		else
+			lo &= ~(0x03 << 4);
+		_wrmsr(GLIU_MSR_REG(GLIU_PAE), hi, lo);
+		break;
+	case PCI_STATUS:
+		if (value & PCI_STATUS_PARITY) {
+			_rdmsr(SB_MSR_REG(SB_ERROR), &hi, &lo);
+			if (lo & SB_PARE_ERR_FLAG) {
+				lo = (lo & 0x0000ffff) | SB_PARE_ERR_FLAG;
+				_wrmsr(SB_MSR_REG(SB_ERROR), hi, lo);
+			}
+		}
+		break;
+	case PCI_CACHE_LINE_SIZE:
+		value &= 0x0000ff00;
+		_rdmsr(SB_MSR_REG(SB_CTRL), &hi, &lo);
+		hi &= 0xffffff00;
+		hi |= (value >> 8);
+		_wrmsr(SB_MSR_REG(SB_CTRL), hi, lo);
+		break;
+	case PCI_BAR4_REG:
+		if (value == PCI_BAR_RANGE_MASK) {
+			_rdmsr(GLCP_MSR_REG(GLCP_SOFT_COM), &hi, &lo);
+			lo |= SOFT_BAR_IDE_FLAG;
+			_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
+		} else if (value & 0x01) {
+			_rdmsr(IDE_MSR_REG(IDE_IO_BAR), &hi, &lo);
+			lo = (value & 0xfffffff0) | 0x1;
+			_wrmsr(IDE_MSR_REG(IDE_IO_BAR), hi, lo);
+
+			value &= 0xfffffffc;
+			hi = 0x60000000 | ((value & 0x000ff000) >> 12);
+			lo = 0x000ffff0 | ((value & 0x00000fff) << 20);
+			_wrmsr(GLIU_MSR_REG(GLIU_IOD_BM2), hi, lo);
+		}
+		break;
+	case PCI_IDE_CFG_REG:
+		if (value == CS5536_IDE_FLASH_SIGNATURE) {
+			_rdmsr(DIVIL_MSR_REG(DIVIL_BALL_OPTS), &hi, &lo);
+			lo |= 0x01;
+			_wrmsr(DIVIL_MSR_REG(DIVIL_BALL_OPTS), hi, lo);
+		} else {
+			_rdmsr(IDE_MSR_REG(IDE_CFG), &hi, &lo);
+			lo = value;
+			_wrmsr(IDE_MSR_REG(IDE_CFG), hi, lo);
+		}
+		break;
+	case PCI_IDE_DTC_REG:
+		_rdmsr(IDE_MSR_REG(IDE_DTC), &hi, &lo);
+		lo = value;
+		_wrmsr(IDE_MSR_REG(IDE_DTC), hi, lo);
+		break;
+	case PCI_IDE_CAST_REG:
+		_rdmsr(IDE_MSR_REG(IDE_CAST), &hi, &lo);
+		lo = value;
+		_wrmsr(IDE_MSR_REG(IDE_CAST), hi, lo);
+		break;
+	case PCI_IDE_ETC_REG:
+		_rdmsr(IDE_MSR_REG(IDE_ETC), &hi, &lo);
+		lo = value;
+		_wrmsr(IDE_MSR_REG(IDE_ETC), hi, lo);
+		break;
+	case PCI_IDE_PM_REG:
+		_rdmsr(IDE_MSR_REG(IDE_INTERNAL_PM), &hi, &lo);
+		lo = value;
+		_wrmsr(IDE_MSR_REG(IDE_INTERNAL_PM), hi, lo);
+		break;
+	default:
+		break;
+	}
+}
+
+u32 pci_ide_read_reg(int reg)
+{
+	u32 conf_data = 0;
+	u32 hi, lo;
+
+	switch (reg) {
+	case PCI_VENDOR_ID:
+		conf_data =
+		    CFG_PCI_VENDOR_ID(CS5536_IDE_DEVICE_ID, CS5536_VENDOR_ID);
+		break;
+	case PCI_COMMAND:
+		_rdmsr(IDE_MSR_REG(IDE_IO_BAR), &hi, &lo);
+		if (lo & 0xfffffff0)
+			conf_data |= PCI_COMMAND_IO;
+		_rdmsr(GLIU_MSR_REG(GLIU_PAE), &hi, &lo);
+		if ((lo & 0x30) == 0x30)
+			conf_data |= PCI_COMMAND_MASTER;
+		break;
+	case PCI_STATUS:
+		conf_data |= PCI_STATUS_66MHZ;
+		conf_data |= PCI_STATUS_FAST_BACK;
+		_rdmsr(SB_MSR_REG(SB_ERROR), &hi, &lo);
+		if (lo & SB_PARE_ERR_FLAG)
+			conf_data |= PCI_STATUS_PARITY;
+		conf_data |= PCI_STATUS_DEVSEL_MEDIUM;
+		break;
+	case PCI_CLASS_REVISION:
+		_rdmsr(IDE_MSR_REG(IDE_CAP), &hi, &lo);
+		conf_data = lo & 0x000000ff;
+		conf_data |= (CS5536_IDE_CLASS_CODE << 8);
+		break;
+	case PCI_CACHE_LINE_SIZE:
+		_rdmsr(SB_MSR_REG(SB_CTRL), &hi, &lo);
+		hi &= 0x000000f8;
+		conf_data = CFG_PCI_CACHE_LINE_SIZE(PCI_NORMAL_HEADER_TYPE, hi);
+		break;
+	case PCI_BAR4_REG:
+		_rdmsr(GLCP_MSR_REG(GLCP_SOFT_COM), &hi, &lo);
+		if (lo & SOFT_BAR_IDE_FLAG) {
+			conf_data = CS5536_IDE_RANGE |
+			    PCI_BASE_ADDRESS_SPACE_IO;
+			lo &= ~SOFT_BAR_IDE_FLAG;
+			_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
+		} else {
+			_rdmsr(IDE_MSR_REG(IDE_IO_BAR), &hi, &lo);
+			conf_data = lo & 0xfffffff0;
+			conf_data |= 0x01;
+			conf_data &= ~0x02;
+		}
+		break;
+	case PCI_CARDBUS_CIS:
+		conf_data = PCI_CARDBUS_CIS_POINTER;
+		break;
+	case PCI_SUBSYSTEM_VENDOR_ID:
+		conf_data =
+		    CFG_PCI_VENDOR_ID(CS5536_IDE_SUB_ID, CS5536_SUB_VENDOR_ID);
+		break;
+	case PCI_ROM_ADDRESS:
+		conf_data = PCI_EXPANSION_ROM_BAR;
+		break;
+	case PCI_CAPABILITY_LIST:
+		conf_data = PCI_CAPLIST_POINTER;
+		break;
+	case PCI_INTERRUPT_LINE:
+		conf_data =
+		    CFG_PCI_INTERRUPT_LINE(PCI_DEFAULT_PIN, CS5536_IDE_INTR);
+		break;
+	case PCI_IDE_CFG_REG:
+		_rdmsr(IDE_MSR_REG(IDE_CFG), &hi, &lo);
+		conf_data = lo;
+		break;
+	case PCI_IDE_DTC_REG:
+		_rdmsr(IDE_MSR_REG(IDE_DTC), &hi, &lo);
+		conf_data = lo;
+		break;
+	case PCI_IDE_CAST_REG:
+		_rdmsr(IDE_MSR_REG(IDE_CAST), &hi, &lo);
+		conf_data = lo;
+		break;
+	case PCI_IDE_ETC_REG:
+		_rdmsr(IDE_MSR_REG(IDE_ETC), &hi, &lo);
+		conf_data = lo;
+		break;
+	case PCI_IDE_PM_REG:
+		_rdmsr(IDE_MSR_REG(IDE_INTERNAL_PM), &hi, &lo);
+		conf_data = lo;
+		break;
+	default:
+		break;
+	}
+
+	return conf_data;
+}
diff --git a/arch/mips/loongson2ef/common/cs5536/cs5536_isa.c b/arch/mips/loongson2ef/common/cs5536/cs5536_isa.c
new file mode 100644
index 000000000..5ad38f86e
--- /dev/null
+++ b/arch/mips/loongson2ef/common/cs5536/cs5536_isa.c
@@ -0,0 +1,326 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * the ISA Virtual Support Module of AMD CS5536
+ *
+ * Copyright (C) 2007 Lemote, Inc.
+ * Author : jlliu, liujl@lemote.com
+ *
+ * Copyright (C) 2009 Lemote, Inc.
+ * Author: Wu Zhangjin, wuzhangjin@gmail.com
+ */
+
+#include <linux/pci.h>
+#include <cs5536/cs5536.h>
+#include <cs5536/cs5536_pci.h>
+
+/* common variables for PCI_ISA_READ/WRITE_BAR */
+static const u32 divil_msr_reg[6] = {
+	DIVIL_MSR_REG(DIVIL_LBAR_SMB), DIVIL_MSR_REG(DIVIL_LBAR_GPIO),
+	DIVIL_MSR_REG(DIVIL_LBAR_MFGPT), DIVIL_MSR_REG(DIVIL_LBAR_IRQ),
+	DIVIL_MSR_REG(DIVIL_LBAR_PMS), DIVIL_MSR_REG(DIVIL_LBAR_ACPI),
+};
+
+static const u32 soft_bar_flag[6] = {
+	SOFT_BAR_SMB_FLAG, SOFT_BAR_GPIO_FLAG, SOFT_BAR_MFGPT_FLAG,
+	SOFT_BAR_IRQ_FLAG, SOFT_BAR_PMS_FLAG, SOFT_BAR_ACPI_FLAG,
+};
+
+static const u32 sb_msr_reg[6] = {
+	SB_MSR_REG(SB_R0), SB_MSR_REG(SB_R1), SB_MSR_REG(SB_R2),
+	SB_MSR_REG(SB_R3), SB_MSR_REG(SB_R4), SB_MSR_REG(SB_R5),
+};
+
+static const u32 bar_space_range[6] = {
+	CS5536_SMB_RANGE, CS5536_GPIO_RANGE, CS5536_MFGPT_RANGE,
+	CS5536_IRQ_RANGE, CS5536_PMS_RANGE, CS5536_ACPI_RANGE,
+};
+
+static const int bar_space_len[6] = {
+	CS5536_SMB_LENGTH, CS5536_GPIO_LENGTH, CS5536_MFGPT_LENGTH,
+	CS5536_IRQ_LENGTH, CS5536_PMS_LENGTH, CS5536_ACPI_LENGTH,
+};
+
+/*
+ * enable the divil module bar space.
+ *
+ * For all the DIVIL module LBAR, you should control the DIVIL LBAR reg
+ * and the RCONFx(0~5) reg to use the modules.
+ */
+static void divil_lbar_enable(void)
+{
+	u32 hi, lo;
+	int offset;
+
+	/*
+	 * The DIVIL IRQ is not used yet. and make the RCONF0 reserved.
+	 */
+
+	for (offset = DIVIL_LBAR_SMB; offset <= DIVIL_LBAR_PMS; offset++) {
+		_rdmsr(DIVIL_MSR_REG(offset), &hi, &lo);
+		hi |= 0x01;
+		_wrmsr(DIVIL_MSR_REG(offset), hi, lo);
+	}
+}
+
+/*
+ * disable the divil module bar space.
+ */
+static void divil_lbar_disable(void)
+{
+	u32 hi, lo;
+	int offset;
+
+	for (offset = DIVIL_LBAR_SMB; offset <= DIVIL_LBAR_PMS; offset++) {
+		_rdmsr(DIVIL_MSR_REG(offset), &hi, &lo);
+		hi &= ~0x01;
+		_wrmsr(DIVIL_MSR_REG(offset), hi, lo);
+	}
+}
+
+/*
+ * BAR write: write value to the n BAR
+ */
+
+void pci_isa_write_bar(int n, u32 value)
+{
+	u32 hi = 0, lo = value;
+
+	if (value == PCI_BAR_RANGE_MASK) {
+		_rdmsr(GLCP_MSR_REG(GLCP_SOFT_COM), &hi, &lo);
+		lo |= soft_bar_flag[n];
+		_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
+	} else if (value & 0x01) {
+		/* NATIVE reg */
+		hi = 0x0000f001;
+		lo &= bar_space_range[n];
+		_wrmsr(divil_msr_reg[n], hi, lo);
+
+		/* RCONFx is 4bytes in units for I/O space */
+		hi = ((value & 0x000ffffc) << 12) |
+		    ((bar_space_len[n] - 4) << 12) | 0x01;
+		lo = ((value & 0x000ffffc) << 12) | 0x01;
+		_wrmsr(sb_msr_reg[n], hi, lo);
+	}
+}
+
+/*
+ * BAR read: read the n BAR
+ */
+
+u32 pci_isa_read_bar(int n)
+{
+	u32 conf_data = 0;
+	u32 hi, lo;
+
+	_rdmsr(GLCP_MSR_REG(GLCP_SOFT_COM), &hi, &lo);
+	if (lo & soft_bar_flag[n]) {
+		conf_data = bar_space_range[n] | PCI_BASE_ADDRESS_SPACE_IO;
+		lo &= ~soft_bar_flag[n];
+		_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
+	} else {
+		_rdmsr(divil_msr_reg[n], &hi, &lo);
+		conf_data = lo & bar_space_range[n];
+		conf_data |= 0x01;
+		conf_data &= ~0x02;
+	}
+	return conf_data;
+}
+
+/*
+ * isa_write: ISA write transfer
+ *
+ * We assume that this is not a bus master transfer.
+ */
+void pci_isa_write_reg(int reg, u32 value)
+{
+	u32 hi = 0, lo = value;
+	u32 temp;
+
+	switch (reg) {
+	case PCI_COMMAND:
+		if (value & PCI_COMMAND_IO)
+			divil_lbar_enable();
+		else
+			divil_lbar_disable();
+		break;
+	case PCI_STATUS:
+		_rdmsr(SB_MSR_REG(SB_ERROR), &hi, &lo);
+		temp = lo & 0x0000ffff;
+		if ((value & PCI_STATUS_SIG_TARGET_ABORT) &&
+		    (lo & SB_TAS_ERR_EN))
+			temp |= SB_TAS_ERR_FLAG;
+
+		if ((value & PCI_STATUS_REC_TARGET_ABORT) &&
+		    (lo & SB_TAR_ERR_EN))
+			temp |= SB_TAR_ERR_FLAG;
+
+		if ((value & PCI_STATUS_REC_MASTER_ABORT)
+		    && (lo & SB_MAR_ERR_EN))
+			temp |= SB_MAR_ERR_FLAG;
+
+		if ((value & PCI_STATUS_DETECTED_PARITY)
+		    && (lo & SB_PARE_ERR_EN))
+			temp |= SB_PARE_ERR_FLAG;
+
+		lo = temp;
+		_wrmsr(SB_MSR_REG(SB_ERROR), hi, lo);
+		break;
+	case PCI_CACHE_LINE_SIZE:
+		value &= 0x0000ff00;
+		_rdmsr(SB_MSR_REG(SB_CTRL), &hi, &lo);
+		hi &= 0xffffff00;
+		hi |= (value >> 8);
+		_wrmsr(SB_MSR_REG(SB_CTRL), hi, lo);
+		break;
+	case PCI_BAR0_REG:
+		pci_isa_write_bar(0, value);
+		break;
+	case PCI_BAR1_REG:
+		pci_isa_write_bar(1, value);
+		break;
+	case PCI_BAR2_REG:
+		pci_isa_write_bar(2, value);
+		break;
+	case PCI_BAR3_REG:
+		pci_isa_write_bar(3, value);
+		break;
+	case PCI_BAR4_REG:
+		pci_isa_write_bar(4, value);
+		break;
+	case PCI_BAR5_REG:
+		pci_isa_write_bar(5, value);
+		break;
+	case PCI_UART1_INT_REG:
+		_rdmsr(DIVIL_MSR_REG(PIC_YSEL_HIGH), &hi, &lo);
+		/* disable uart1 interrupt in PIC */
+		lo &= ~(0xf << 24);
+		if (value)	/* enable uart1 interrupt in PIC */
+			lo |= (CS5536_UART1_INTR << 24);
+		_wrmsr(DIVIL_MSR_REG(PIC_YSEL_HIGH), hi, lo);
+		break;
+	case PCI_UART2_INT_REG:
+		_rdmsr(DIVIL_MSR_REG(PIC_YSEL_HIGH), &hi, &lo);
+		/* disable uart2 interrupt in PIC */
+		lo &= ~(0xf << 28);
+		if (value)	/* enable uart2 interrupt in PIC */
+			lo |= (CS5536_UART2_INTR << 28);
+		_wrmsr(DIVIL_MSR_REG(PIC_YSEL_HIGH), hi, lo);
+		break;
+	case PCI_ISA_FIXUP_REG:
+		if (value) {
+			/* enable the TARGET ABORT/MASTER ABORT etc. */
+			_rdmsr(SB_MSR_REG(SB_ERROR), &hi, &lo);
+			lo |= 0x00000063;
+			_wrmsr(SB_MSR_REG(SB_ERROR), hi, lo);
+		}
+
+	default:
+		/* ALL OTHER PCI CONFIG SPACE HEADER IS NOT IMPLEMENTED. */
+		break;
+	}
+}
+
+/*
+ * isa_read: ISA read transfers
+ *
+ * We assume that this is not a bus master transfer.
+ */
+u32 pci_isa_read_reg(int reg)
+{
+	u32 conf_data = 0;
+	u32 hi, lo;
+
+	switch (reg) {
+	case PCI_VENDOR_ID:
+		conf_data =
+		    CFG_PCI_VENDOR_ID(CS5536_ISA_DEVICE_ID, CS5536_VENDOR_ID);
+		break;
+	case PCI_COMMAND:
+		/* we just check the first LBAR for the IO enable bit, */
+		/* maybe we should changed later. */
+		_rdmsr(DIVIL_MSR_REG(DIVIL_LBAR_SMB), &hi, &lo);
+		if (hi & 0x01)
+			conf_data |= PCI_COMMAND_IO;
+		break;
+	case PCI_STATUS:
+		conf_data |= PCI_STATUS_66MHZ;
+		conf_data |= PCI_STATUS_DEVSEL_MEDIUM;
+		conf_data |= PCI_STATUS_FAST_BACK;
+
+		_rdmsr(SB_MSR_REG(SB_ERROR), &hi, &lo);
+		if (lo & SB_TAS_ERR_FLAG)
+			conf_data |= PCI_STATUS_SIG_TARGET_ABORT;
+		if (lo & SB_TAR_ERR_FLAG)
+			conf_data |= PCI_STATUS_REC_TARGET_ABORT;
+		if (lo & SB_MAR_ERR_FLAG)
+			conf_data |= PCI_STATUS_REC_MASTER_ABORT;
+		if (lo & SB_PARE_ERR_FLAG)
+			conf_data |= PCI_STATUS_DETECTED_PARITY;
+		break;
+	case PCI_CLASS_REVISION:
+		_rdmsr(GLCP_MSR_REG(GLCP_CHIP_REV_ID), &hi, &lo);
+		conf_data = lo & 0x000000ff;
+		conf_data |= (CS5536_ISA_CLASS_CODE << 8);
+		break;
+	case PCI_CACHE_LINE_SIZE:
+		_rdmsr(SB_MSR_REG(SB_CTRL), &hi, &lo);
+		hi &= 0x000000f8;
+		conf_data = CFG_PCI_CACHE_LINE_SIZE(PCI_BRIDGE_HEADER_TYPE, hi);
+		break;
+		/*
+		 * we only use the LBAR of DIVIL, no RCONF used.
+		 * all of them are IO space.
+		 */
+	case PCI_BAR0_REG:
+		return pci_isa_read_bar(0);
+		break;
+	case PCI_BAR1_REG:
+		return pci_isa_read_bar(1);
+		break;
+	case PCI_BAR2_REG:
+		return pci_isa_read_bar(2);
+		break;
+	case PCI_BAR3_REG:
+		break;
+	case PCI_BAR4_REG:
+		return pci_isa_read_bar(4);
+		break;
+	case PCI_BAR5_REG:
+		return pci_isa_read_bar(5);
+		break;
+	case PCI_CARDBUS_CIS:
+		conf_data = PCI_CARDBUS_CIS_POINTER;
+		break;
+	case PCI_SUBSYSTEM_VENDOR_ID:
+		conf_data =
+		    CFG_PCI_VENDOR_ID(CS5536_ISA_SUB_ID, CS5536_SUB_VENDOR_ID);
+		break;
+	case PCI_ROM_ADDRESS:
+		conf_data = PCI_EXPANSION_ROM_BAR;
+		break;
+	case PCI_CAPABILITY_LIST:
+		conf_data = PCI_CAPLIST_POINTER;
+		break;
+	case PCI_INTERRUPT_LINE:
+		/* no interrupt used here */
+		conf_data = CFG_PCI_INTERRUPT_LINE(0x00, 0x00);
+		break;
+	default:
+		break;
+	}
+
+	return conf_data;
+}
+
+/*
+ * The mfgpt timer interrupt is running early, so we must keep the south bridge
+ * mmio always enabled. Otherwise we may race with the PCI configuration which
+ * may temporarily disable it. When that happens and the timer interrupt fires,
+ * we are not able to clear it and the system will hang.
+ */
+static void cs5536_isa_mmio_always_on(struct pci_dev *dev)
+{
+	dev->mmio_always_on = 1;
+}
+DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA,
+	PCI_CLASS_BRIDGE_ISA, 8, cs5536_isa_mmio_always_on);
diff --git a/arch/mips/loongson2ef/common/cs5536/cs5536_mfgpt.c b/arch/mips/loongson2ef/common/cs5536/cs5536_mfgpt.c
new file mode 100644
index 000000000..f21a540a1
--- /dev/null
+++ b/arch/mips/loongson2ef/common/cs5536/cs5536_mfgpt.c
@@ -0,0 +1,203 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * CS5536 General timer functions
+ *
+ * Copyright (C) 2007 Lemote Inc. & Institute of Computing Technology
+ * Author: Yanhua, yanh@lemote.com
+ *
+ * Copyright (C) 2009 Lemote Inc.
+ * Author: Wu zhangjin, wuzhangjin@gmail.com
+ *
+ * Reference: AMD Geode(TM) CS5536 Companion Device Data Book
+ */
+
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/export.h>
+#include <linux/jiffies.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/clockchips.h>
+
+#include <asm/time.h>
+
+#include <cs5536/cs5536_mfgpt.h>
+
+static DEFINE_RAW_SPINLOCK(mfgpt_lock);
+
+static u32 mfgpt_base;
+
+/*
+ * Initialize the MFGPT timer.
+ *
+ * This is also called after resume to bring the MFGPT into operation again.
+ */
+
+/* disable counter */
+void disable_mfgpt0_counter(void)
+{
+	outw(inw(MFGPT0_SETUP) & 0x7fff, MFGPT0_SETUP);
+}
+EXPORT_SYMBOL(disable_mfgpt0_counter);
+
+/* enable counter, comparator2 to event mode, 14.318MHz clock */
+void enable_mfgpt0_counter(void)
+{
+	outw(0xe310, MFGPT0_SETUP);
+}
+EXPORT_SYMBOL(enable_mfgpt0_counter);
+
+static int mfgpt_timer_set_periodic(struct clock_event_device *evt)
+{
+	raw_spin_lock(&mfgpt_lock);
+
+	outw(COMPARE, MFGPT0_CMP2);	/* set comparator2 */
+	outw(0, MFGPT0_CNT);		/* set counter to 0 */
+	enable_mfgpt0_counter();
+
+	raw_spin_unlock(&mfgpt_lock);
+	return 0;
+}
+
+static int mfgpt_timer_shutdown(struct clock_event_device *evt)
+{
+	if (clockevent_state_periodic(evt) || clockevent_state_oneshot(evt)) {
+		raw_spin_lock(&mfgpt_lock);
+		disable_mfgpt0_counter();
+		raw_spin_unlock(&mfgpt_lock);
+	}
+
+	return 0;
+}
+
+static struct clock_event_device mfgpt_clockevent = {
+	.name = "mfgpt",
+	.features = CLOCK_EVT_FEAT_PERIODIC,
+
+	/* The oneshot mode have very high deviation, don't use it! */
+	.set_state_shutdown = mfgpt_timer_shutdown,
+	.set_state_periodic = mfgpt_timer_set_periodic,
+	.irq = CS5536_MFGPT_INTR,
+};
+
+static irqreturn_t timer_interrupt(int irq, void *dev_id)
+{
+	u32 basehi;
+
+	/*
+	 * get MFGPT base address
+	 *
+	 * NOTE: do not remove me, it's need for the value of mfgpt_base is
+	 * variable
+	 */
+	_rdmsr(DIVIL_MSR_REG(DIVIL_LBAR_MFGPT), &basehi, &mfgpt_base);
+
+	/* ack */
+	outw(inw(MFGPT0_SETUP) | 0x4000, MFGPT0_SETUP);
+
+	mfgpt_clockevent.event_handler(&mfgpt_clockevent);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * Initialize the conversion factor and the min/max deltas of the clock event
+ * structure and register the clock event source with the framework.
+ */
+void __init setup_mfgpt0_timer(void)
+{
+	u32 basehi;
+	struct clock_event_device *cd = &mfgpt_clockevent;
+	unsigned int cpu = smp_processor_id();
+
+	cd->cpumask = cpumask_of(cpu);
+	clockevent_set_clock(cd, MFGPT_TICK_RATE);
+	cd->max_delta_ns = clockevent_delta2ns(0xffff, cd);
+	cd->max_delta_ticks = 0xffff;
+	cd->min_delta_ns = clockevent_delta2ns(0xf, cd);
+	cd->min_delta_ticks = 0xf;
+
+	/* Enable MFGPT0 Comparator 2 Output to the Interrupt Mapper */
+	_wrmsr(DIVIL_MSR_REG(MFGPT_IRQ), 0, 0x100);
+
+	/* Enable Interrupt Gate 5 */
+	_wrmsr(DIVIL_MSR_REG(PIC_ZSEL_LOW), 0, 0x50000);
+
+	/* get MFGPT base address */
+	_rdmsr(DIVIL_MSR_REG(DIVIL_LBAR_MFGPT), &basehi, &mfgpt_base);
+
+	clockevents_register_device(cd);
+
+	if (request_irq(CS5536_MFGPT_INTR, timer_interrupt,
+			IRQF_NOBALANCING | IRQF_TIMER, "timer", NULL))
+		pr_err("Failed to register timer interrupt\n");
+}
+
+/*
+ * Since the MFGPT overflows every tick, its not very useful
+ * to just read by itself. So use jiffies to emulate a free
+ * running counter:
+ */
+static u64 mfgpt_read(struct clocksource *cs)
+{
+	unsigned long flags;
+	int count;
+	u32 jifs;
+	static int old_count;
+	static u32 old_jifs;
+
+	raw_spin_lock_irqsave(&mfgpt_lock, flags);
+	/*
+	 * Although our caller may have the read side of xtime_lock,
+	 * this is now a seqlock, and we are cheating in this routine
+	 * by having side effects on state that we cannot undo if
+	 * there is a collision on the seqlock and our caller has to
+	 * retry.  (Namely, old_jifs and old_count.)  So we must treat
+	 * jiffies as volatile despite the lock.  We read jiffies
+	 * before latching the timer count to guarantee that although
+	 * the jiffies value might be older than the count (that is,
+	 * the counter may underflow between the last point where
+	 * jiffies was incremented and the point where we latch the
+	 * count), it cannot be newer.
+	 */
+	jifs = jiffies;
+	/* read the count */
+	count = inw(MFGPT0_CNT);
+
+	/*
+	 * It's possible for count to appear to go the wrong way for this
+	 * reason:
+	 *
+	 *  The timer counter underflows, but we haven't handled the resulting
+	 *  interrupt and incremented jiffies yet.
+	 *
+	 * Previous attempts to handle these cases intelligently were buggy, so
+	 * we just do the simple thing now.
+	 */
+	if (count < old_count && jifs == old_jifs)
+		count = old_count;
+
+	old_count = count;
+	old_jifs = jifs;
+
+	raw_spin_unlock_irqrestore(&mfgpt_lock, flags);
+
+	return (u64) (jifs * COMPARE) + count;
+}
+
+static struct clocksource clocksource_mfgpt = {
+	.name = "mfgpt",
+	.rating = 120, /* Functional for real use, but not desired */
+	.read = mfgpt_read,
+	.mask = CLOCKSOURCE_MASK(32),
+};
+
+int __init init_mfgpt_clocksource(void)
+{
+	if (num_possible_cpus() > 1)	/* MFGPT does not scale! */
+		return 0;
+
+	return clocksource_register_hz(&clocksource_mfgpt, MFGPT_TICK_RATE);
+}
+
+arch_initcall(init_mfgpt_clocksource);
diff --git a/arch/mips/loongson2ef/common/cs5536/cs5536_ohci.c b/arch/mips/loongson2ef/common/cs5536/cs5536_ohci.c
new file mode 100644
index 000000000..71a52b120
--- /dev/null
+++ b/arch/mips/loongson2ef/common/cs5536/cs5536_ohci.c
@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * the OHCI Virtual Support Module of AMD CS5536
+ *
+ * Copyright (C) 2007 Lemote, Inc.
+ * Author : jlliu, liujl@lemote.com
+ *
+ * Copyright (C) 2009 Lemote, Inc.
+ * Author: Wu Zhangjin, wuzhangjin@gmail.com
+ */
+
+#include <cs5536/cs5536.h>
+#include <cs5536/cs5536_pci.h>
+
+void pci_ohci_write_reg(int reg, u32 value)
+{
+	u32 hi = 0, lo = value;
+
+	switch (reg) {
+	case PCI_COMMAND:
+		_rdmsr(USB_MSR_REG(USB_OHCI), &hi, &lo);
+		if (value & PCI_COMMAND_MASTER)
+			hi |= PCI_COMMAND_MASTER;
+		else
+			hi &= ~PCI_COMMAND_MASTER;
+
+		if (value & PCI_COMMAND_MEMORY)
+			hi |= PCI_COMMAND_MEMORY;
+		else
+			hi &= ~PCI_COMMAND_MEMORY;
+		_wrmsr(USB_MSR_REG(USB_OHCI), hi, lo);
+		break;
+	case PCI_STATUS:
+		if (value & PCI_STATUS_PARITY) {
+			_rdmsr(SB_MSR_REG(SB_ERROR), &hi, &lo);
+			if (lo & SB_PARE_ERR_FLAG) {
+				lo = (lo & 0x0000ffff) | SB_PARE_ERR_FLAG;
+				_wrmsr(SB_MSR_REG(SB_ERROR), hi, lo);
+			}
+		}
+		break;
+	case PCI_BAR0_REG:
+		if (value == PCI_BAR_RANGE_MASK) {
+			_rdmsr(GLCP_MSR_REG(GLCP_SOFT_COM), &hi, &lo);
+			lo |= SOFT_BAR_OHCI_FLAG;
+			_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
+		} else if ((value & 0x01) == 0x00) {
+			_rdmsr(USB_MSR_REG(USB_OHCI), &hi, &lo);
+			lo = value;
+			_wrmsr(USB_MSR_REG(USB_OHCI), hi, lo);
+
+			value &= 0xfffffff0;
+			hi = 0x40000000 | ((value & 0xff000000) >> 24);
+			lo = 0x000fffff | ((value & 0x00fff000) << 8);
+			_wrmsr(GLIU_MSR_REG(GLIU_P2D_BM3), hi, lo);
+		}
+		break;
+	case PCI_OHCI_INT_REG:
+		_rdmsr(DIVIL_MSR_REG(PIC_YSEL_LOW), &hi, &lo);
+		lo &= ~(0xf << PIC_YSEL_LOW_USB_SHIFT);
+		if (value)	/* enable all the usb interrupt in PIC */
+			lo |= (CS5536_USB_INTR << PIC_YSEL_LOW_USB_SHIFT);
+		_wrmsr(DIVIL_MSR_REG(PIC_YSEL_LOW), hi, lo);
+		break;
+	default:
+		break;
+	}
+}
+
+u32 pci_ohci_read_reg(int reg)
+{
+	u32 conf_data = 0;
+	u32 hi, lo;
+
+	switch (reg) {
+	case PCI_VENDOR_ID:
+		conf_data =
+		    CFG_PCI_VENDOR_ID(CS5536_OHCI_DEVICE_ID, CS5536_VENDOR_ID);
+		break;
+	case PCI_COMMAND:
+		_rdmsr(USB_MSR_REG(USB_OHCI), &hi, &lo);
+		if (hi & PCI_COMMAND_MASTER)
+			conf_data |= PCI_COMMAND_MASTER;
+		if (hi & PCI_COMMAND_MEMORY)
+			conf_data |= PCI_COMMAND_MEMORY;
+		break;
+	case PCI_STATUS:
+		conf_data |= PCI_STATUS_66MHZ;
+		conf_data |= PCI_STATUS_FAST_BACK;
+		_rdmsr(SB_MSR_REG(SB_ERROR), &hi, &lo);
+		if (lo & SB_PARE_ERR_FLAG)
+			conf_data |= PCI_STATUS_PARITY;
+		conf_data |= PCI_STATUS_DEVSEL_MEDIUM;
+		break;
+	case PCI_CLASS_REVISION:
+		_rdmsr(USB_MSR_REG(USB_CAP), &hi, &lo);
+		conf_data = lo & 0x000000ff;
+		conf_data |= (CS5536_OHCI_CLASS_CODE << 8);
+		break;
+	case PCI_CACHE_LINE_SIZE:
+		conf_data =
+		    CFG_PCI_CACHE_LINE_SIZE(PCI_NORMAL_HEADER_TYPE,
+					    PCI_NORMAL_LATENCY_TIMER);
+		break;
+	case PCI_BAR0_REG:
+		_rdmsr(GLCP_MSR_REG(GLCP_SOFT_COM), &hi, &lo);
+		if (lo & SOFT_BAR_OHCI_FLAG) {
+			conf_data = CS5536_OHCI_RANGE |
+			    PCI_BASE_ADDRESS_SPACE_MEMORY;
+			lo &= ~SOFT_BAR_OHCI_FLAG;
+			_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
+		} else {
+			_rdmsr(USB_MSR_REG(USB_OHCI), &hi, &lo);
+			conf_data = lo & 0xffffff00;
+			conf_data &= ~0x0000000f;	/* 32bit mem */
+		}
+		break;
+	case PCI_CARDBUS_CIS:
+		conf_data = PCI_CARDBUS_CIS_POINTER;
+		break;
+	case PCI_SUBSYSTEM_VENDOR_ID:
+		conf_data =
+		    CFG_PCI_VENDOR_ID(CS5536_OHCI_SUB_ID, CS5536_SUB_VENDOR_ID);
+		break;
+	case PCI_ROM_ADDRESS:
+		conf_data = PCI_EXPANSION_ROM_BAR;
+		break;
+	case PCI_CAPABILITY_LIST:
+		conf_data = PCI_CAPLIST_USB_POINTER;
+		break;
+	case PCI_INTERRUPT_LINE:
+		conf_data =
+		    CFG_PCI_INTERRUPT_LINE(PCI_DEFAULT_PIN, CS5536_USB_INTR);
+		break;
+	case PCI_OHCI_INT_REG:
+		_rdmsr(DIVIL_MSR_REG(PIC_YSEL_LOW), &hi, &lo);
+		if (((lo >> PIC_YSEL_LOW_USB_SHIFT) & 0xf) == CS5536_USB_INTR)
+			conf_data = 1;
+		break;
+	default:
+		break;
+	}
+
+	return conf_data;
+}
diff --git a/arch/mips/loongson2ef/common/cs5536/cs5536_pci.c b/arch/mips/loongson2ef/common/cs5536/cs5536_pci.c
new file mode 100644
index 000000000..202c89b56
--- /dev/null
+++ b/arch/mips/loongson2ef/common/cs5536/cs5536_pci.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * read/write operation to the PCI config space of CS5536
+ *
+ * Copyright (C) 2007 Lemote, Inc.
+ * Author : jlliu, liujl@lemote.com
+ *
+ * Copyright (C) 2009 Lemote, Inc.
+ * Author: Wu Zhangjin, wuzhangjin@gmail.com
+ *
+ *	the Virtual Support Module(VSM) for virtulizing the PCI
+ *	configure space are defined in cs5536_modulename.c respectively,
+ *
+ *	after this virtulizing, user can access the PCI configure space
+ *	directly as a normal multi-function PCI device which follows
+ *	the PCI-2.2 spec.
+ */
+
+#include <linux/types.h>
+#include <cs5536/cs5536_pci.h>
+#include <cs5536/cs5536_vsm.h>
+
+enum {
+	CS5536_FUNC_START = -1,
+	CS5536_ISA_FUNC,
+	reserved_func,
+	CS5536_IDE_FUNC,
+	CS5536_ACC_FUNC,
+	CS5536_OHCI_FUNC,
+	CS5536_EHCI_FUNC,
+	CS5536_FUNC_END,
+};
+
+static const cs5536_pci_vsm_write vsm_conf_write[] = {
+	[CS5536_ISA_FUNC]	= pci_isa_write_reg,
+	[reserved_func]		= NULL,
+	[CS5536_IDE_FUNC]	= pci_ide_write_reg,
+	[CS5536_ACC_FUNC]	= pci_acc_write_reg,
+	[CS5536_OHCI_FUNC]	= pci_ohci_write_reg,
+	[CS5536_EHCI_FUNC]	= pci_ehci_write_reg,
+};
+
+static const cs5536_pci_vsm_read vsm_conf_read[] = {
+	[CS5536_ISA_FUNC]	= pci_isa_read_reg,
+	[reserved_func]		= NULL,
+	[CS5536_IDE_FUNC]	= pci_ide_read_reg,
+	[CS5536_ACC_FUNC]	= pci_acc_read_reg,
+	[CS5536_OHCI_FUNC]	= pci_ohci_read_reg,
+	[CS5536_EHCI_FUNC]	= pci_ehci_read_reg,
+};
+
+/*
+ * write to PCI config space and transfer it to MSR write.
+ */
+void cs5536_pci_conf_write4(int function, int reg, u32 value)
+{
+	if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
+		return;
+	if ((reg < 0) || (reg > 0x100) || ((reg & 0x03) != 0))
+		return;
+
+	if (vsm_conf_write[function] != NULL)
+		vsm_conf_write[function](reg, value);
+}
+
+/*
+ * read PCI config space and transfer it to MSR access.
+ */
+u32 cs5536_pci_conf_read4(int function, int reg)
+{
+	u32 data = 0;
+
+	if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
+		return 0;
+	if ((reg < 0) || ((reg & 0x03) != 0))
+		return 0;
+	if (reg > 0x100)
+		return 0xffffffff;
+
+	if (vsm_conf_read[function] != NULL)
+		data = vsm_conf_read[function](reg);
+
+	return data;
+}