MIPS: Lemote 2F: Add basic CS5536 VSM support

Lemote Loongson 2F family machines use CS5536 as their south bridge and need
these lowlevel interfaces to access the devices on CS5536.

Virtualize the legacy devices on CS5536 as PCI devices.  This way users can
access the CS5536 PCI config space directly as a normal multi-function
PCI 2.2 device.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: zhangfx@lemote.com
Cc: yanh@lemote.com 
Cc: huhb@lemote.com
Cc: Nicholas Mc Guire <hofrat@hofr.at>
Cc: Arnaud Patard <apatard@mandriva.com>
Cc: loongson-dev@googlegroups.com
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 147 insertions, 0 deletions

diff --git a/arch/mips/loongson/common/cs5536/cs5536_ohci.c b/arch/mips/loongson/common/cs5536/cs5536_ohci.c
new file mode 100644
index 00000000000..8fdb02b6e90
--- /dev/null
+++ b/arch/mips/loongson/common/cs5536/cs5536_ohci.c
@@ -0,0 +1,147 @@
+/*
+ * 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, wuzj@lemote.com
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#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) {
+			_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 & 0x00000f00) == CS5536_USB_INTR)
+			conf_data = 1;
+		break;
+	default:
+		break;
+	}
+
+	return conf_data;
+}