MIPS: Lemote 2F: Add PCI support

PCI support for the Fuloong 2E and Lemote Loongson 2F family machines is
mostly identical with the exception of CS5536 support.

Rename ops-fuloong2e.c to ops-loongson2.c then add the CS5536 support to
share most of the source code among Loongson machines.

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>

3 files changed, 216 insertions, 1 deletions

diff --git a/arch/mips/pci/Makefile b/arch/mips/pci/Makefile
index 0610c869852..c9a0dc12223 100644
--- a/arch/mips/pci/Makefile
+++ b/arch/mips/pci/Makefile
@@ -28,7 +28,8 @@ obj-$(CONFIG_MIPS_COBALT)	+= fixup-cobalt.o
 obj-$(CONFIG_SOC_AU1500)	+= fixup-au1000.o ops-au1000.o
 obj-$(CONFIG_SOC_AU1550)	+= fixup-au1000.o ops-au1000.o
 obj-$(CONFIG_SOC_PNX8550)	+= fixup-pnx8550.o ops-pnx8550.o
-obj-$(CONFIG_LEMOTE_FULOONG2E)	+= fixup-fuloong2e.o ops-fuloong2e.o
+obj-$(CONFIG_LEMOTE_FULOONG2E)	+= fixup-fuloong2e.o ops-loongson2.o
+obj-$(CONFIG_LEMOTE_MACH2F)	+= fixup-lemote2f.o ops-loongson2.o
 obj-$(CONFIG_MIPS_MALTA)	+= fixup-malta.o
 obj-$(CONFIG_PMC_MSP7120_GW)	+= fixup-pmcmsp.o ops-pmcmsp.o
 obj-$(CONFIG_PMC_MSP7120_EVAL)	+= fixup-pmcmsp.o ops-pmcmsp.o
diff --git a/arch/mips/pci/fixup-lemote2f.c b/arch/mips/pci/fixup-lemote2f.c
new file mode 100644
index 00000000000..caf2edeb02f
--- /dev/null
+++ b/arch/mips/pci/fixup-lemote2f.c
@@ -0,0 +1,160 @@
+/*
+ * Copyright (C) 2008 Lemote Technology
+ * Copyright (C) 2004 ICT CAS
+ * Author: Li xiaoyu, lixy@ict.ac.cn
+ *
+ * Copyright (C) 2007 Lemote, Inc.
+ * Author: Fuxin Zhang, zhangfx@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 <linux/init.h>
+#include <linux/pci.h>
+
+#include <loongson.h>
+#include <cs5536/cs5536.h>
+#include <cs5536/cs5536_pci.h>
+
+/* PCI interrupt pins
+ *
+ * These should not be changed, or you should consider loongson2f interrupt
+ * register and your pci card dispatch
+ */
+
+#define PCIA		4
+#define PCIB		5
+#define PCIC		6
+#define PCID		7
+
+/* all the pci device has the PCIA pin, check the datasheet. */
+static char irq_tab[][5] __initdata = {
+	/*      INTA    INTB    INTC    INTD */
+	{0, 0, 0, 0, 0},	/*  11: Unused */
+	{0, 0, 0, 0, 0},	/*  12: Unused */
+	{0, 0, 0, 0, 0},	/*  13: Unused */
+	{0, 0, 0, 0, 0},	/*  14: Unused */
+	{0, 0, 0, 0, 0},	/*  15: Unused */
+	{0, 0, 0, 0, 0},	/*  16: Unused */
+	{0, PCIA, 0, 0, 0},	/*  17: RTL8110-0 */
+	{0, PCIB, 0, 0, 0},	/*  18: RTL8110-1 */
+	{0, PCIC, 0, 0, 0},	/*  19: SiI3114 */
+	{0, PCID, 0, 0, 0},	/*  20: 3-ports nec usb */
+	{0, PCIA, PCIB, PCIC, PCID},	/*  21: PCI-SLOT */
+	{0, 0, 0, 0, 0},	/*  22: Unused */
+	{0, 0, 0, 0, 0},	/*  23: Unused */
+	{0, 0, 0, 0, 0},	/*  24: Unused */
+	{0, 0, 0, 0, 0},	/*  25: Unused */
+	{0, 0, 0, 0, 0},	/*  26: Unused */
+	{0, 0, 0, 0, 0},	/*  27: Unused */
+};
+
+int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	int virq;
+
+	if ((PCI_SLOT(dev->devfn) != PCI_IDSEL_CS5536)
+	    && (PCI_SLOT(dev->devfn) < 32)) {
+		virq = irq_tab[slot][pin];
+		printk(KERN_INFO "slot: %d, pin: %d, irq: %d\n", slot, pin,
+		       virq + LOONGSON_IRQ_BASE);
+		if (virq != 0)
+			return LOONGSON_IRQ_BASE + virq;
+		else
+			return 0;
+	} else if (PCI_SLOT(dev->devfn) == PCI_IDSEL_CS5536) {	/*  cs5536 */
+		switch (PCI_FUNC(dev->devfn)) {
+		case 2:
+			pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
+					      CS5536_IDE_INTR);
+			return CS5536_IDE_INTR;	/*  for IDE */
+		case 3:
+			pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
+					      CS5536_ACC_INTR);
+			return CS5536_ACC_INTR;	/*  for AUDIO */
+		case 4:	/*  for OHCI */
+		case 5:	/*  for EHCI */
+		case 6:	/*  for UDC */
+		case 7:	/*  for OTG */
+			pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
+					      CS5536_USB_INTR);
+			return CS5536_USB_INTR;
+		}
+		return dev->irq;
+	} else {
+		printk(KERN_INFO " strange pci slot number.\n");
+		return 0;
+	}
+}
+
+/* Do platform specific device initialization at pci_enable_device() time */
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+	return 0;
+}
+
+/* CS5536 SPEC. fixup */
+static void __init loongson_cs5536_isa_fixup(struct pci_dev *pdev)
+{
+	/* the uart1 and uart2 interrupt in PIC is enabled as default */
+	pci_write_config_dword(pdev, PCI_UART1_INT_REG, 1);
+	pci_write_config_dword(pdev, PCI_UART2_INT_REG, 1);
+}
+
+static void __init loongson_cs5536_ide_fixup(struct pci_dev *pdev)
+{
+	/* setting the mutex pin as IDE function */
+	pci_write_config_dword(pdev, PCI_IDE_CFG_REG,
+			       CS5536_IDE_FLASH_SIGNATURE);
+}
+
+static void __init loongson_cs5536_acc_fixup(struct pci_dev *pdev)
+{
+	/* enable the AUDIO interrupt in PIC  */
+	pci_write_config_dword(pdev, PCI_ACC_INT_REG, 1);
+
+	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xc0);
+}
+
+static void __init loongson_cs5536_ohci_fixup(struct pci_dev *pdev)
+{
+	/* enable the OHCI interrupt in PIC */
+	/* THE OHCI, EHCI, UDC, OTG are shared with interrupt in PIC */
+	pci_write_config_dword(pdev, PCI_OHCI_INT_REG, 1);
+}
+
+static void __init loongson_cs5536_ehci_fixup(struct pci_dev *pdev)
+{
+	u32 hi, lo;
+
+	/* Serial short detect enable */
+	_rdmsr(USB_MSR_REG(USB_CONFIG), &hi, &lo);
+	_wrmsr(USB_MSR_REG(USB_CONFIG), (1 << 1) | (1 << 2) | (1 << 3), lo);
+
+	/* setting the USB2.0 micro frame length */
+	pci_write_config_dword(pdev, PCI_EHCI_FLADJ_REG, 0x2000);
+}
+
+static void __init loongson_nec_fixup(struct pci_dev *pdev)
+{
+	unsigned int val;
+
+	pci_read_config_dword(pdev, 0xe0, &val);
+	/* Only 2 port be used */
+	pci_write_config_dword(pdev, 0xe0, (val & ~3) | 0x2);
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA,
+			 loongson_cs5536_isa_fixup);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_OHC,
+			 loongson_cs5536_ohci_fixup);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_EHC,
+			 loongson_cs5536_ehci_fixup);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_AUDIO,
+			 loongson_cs5536_acc_fixup);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_IDE,
+			 loongson_cs5536_ide_fixup);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
+			 loongson_nec_fixup);
diff --git a/arch/mips/pci/ops-fuloong2e.c b/arch/mips/pci/ops-loongson2.c
index 171f65c99ca..aa5d3da2721 100644
--- a/arch/mips/pci/ops-fuloong2e.c
+++ b/arch/mips/pci/ops-loongson2.c
@@ -20,6 +20,11 @@
 
 #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
 
@@ -43,6 +48,29 @@ static int loongson_pcibios_config_access(unsigned char access_type,
 	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;
@@ -152,3 +180,29 @@ struct pci_ops loongson_pci_ops = {
 	.read = loongson_pcibios_read,
 	.write = loongson_pcibios_write
 };
+
+#ifdef CONFIG_CS5536
+void _rdmsr(u32 msr, u32 *hi, u32 *lo)
+{
+	struct pci_bus bus = {
+		.number = PCI_BUS_CS5536
+	};
+	u32 devfn = PCI_DEVFN(PCI_IDSEL_CS5536, 0);
+	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);
+}
+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);
+	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);
+}
+EXPORT_SYMBOL(_wrmsr);
+#endif