1 files changed, 84 insertions, 0 deletions
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;
+}