MIPS: Loongson: Split common loongson source code out

To share common loongson source code between all of the loongson-based
machines. there is a need to split it out of the fuloong-2e/ directory.
at the same time, other according tuning is needed. the machine-specific
parts are defined as macros in relative header file, pci.h, mem.h,
machine.h.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -174,30 +174,15 @@ config LASAT
 	select SYS_SUPPORTS_64BIT_KERNEL if BROKEN
 	select SYS_SUPPORTS_LITTLE_ENDIAN
 
-config LEMOTE_FULOONG2E
-	bool "Lemote Fuloong2e mini-PC"
-	select ARCH_SPARSEMEM_ENABLE
-	select CEVT_R4K
-	select CSRC_R4K
-	select SYS_HAS_CPU_LOONGSON2
-	select DMA_NONCOHERENT
-	select BOOT_ELF32
-	select BOARD_SCACHE
-	select HAVE_STD_PC_SERIAL_PORT
-	select HW_HAS_PCI
-	select I8259
-	select ISA
-	select IRQ_CPU
-	select SYS_SUPPORTS_32BIT_KERNEL
-	select SYS_SUPPORTS_64BIT_KERNEL
-	select SYS_SUPPORTS_LITTLE_ENDIAN
-	select SYS_SUPPORTS_HIGHMEM
-	select SYS_HAS_EARLY_PRINTK
-	select GENERIC_ISA_DMA_SUPPORT_BROKEN
-	select CPU_HAS_WB
+config MACH_LOONGSON
+	bool "Loongson family of machines"
 	help
-	  Lemote Fuloong2e mini-PC board based on the Chinese Loongson-2E CPU and
-	  an FPGA northbridge
+	  This enables the support of Loongson family of machines.
+
+	  Loongson is a family of general-purpose MIPS-compatible CPUs.
+	  developed at Institute of Computing Technology (ICT),
+	  Chinese Academy of Sciences (CAS) in the People's Republic
+	  of China. The chief architect is Professor Weiwu Hu.
 
 config MIPS_MALTA
 	bool "MIPS Malta board"
@@ -668,6 +653,7 @@ source "arch/mips/sibyte/Kconfig"
 source "arch/mips/txx9/Kconfig"
 source "arch/mips/vr41xx/Kconfig"
 source "arch/mips/cavium-octeon/Kconfig"
+source "arch/mips/loongson/Kconfig"
 
 endmenu
 

arch/mips/Makefile

@@ -314,11 +314,12 @@ cflags-$(CONFIG_WR_PPMC)		+= -I$(srctree)/arch/mips/include/asm/mach-wrppmc
 load-$(CONFIG_WR_PPMC)		+= 0xffffffff80100000
 
 #
-# lemote fuloong2e mini-PC board
+# Loongson family
 #
-core-$(CONFIG_LEMOTE_FULOONG2E) +=arch/mips/loongson/fuloong-2e/
+core-$(CONFIG_MACH_LOONGSON) +=arch/mips/loongson/
+cflags-$(CONFIG_MACH_LOONGSON) += -I$(srctree)/arch/mips/include/asm/mach-loongson \
+                    -mno-branch-likely
 load-$(CONFIG_LEMOTE_FULOONG2E) +=0xffffffff80100000
-cflags-$(CONFIG_LEMOTE_FULOONG2E) += -I$(srctree)/arch/mips/include/asm/mach-loongson/
 
 #
 # MIPS Malta board

arch/mips/include/asm/mach-loongson/loongson.h

@@ -21,6 +21,10 @@
 /* loongson internal northbridge initialization */
 extern void bonito_irq_init(void);
 
+/* machine-specific reboot/halt operation */
+extern void mach_prepare_reboot(void);
+extern void mach_prepare_shutdown(void);
+
 /* environment arguments from bootloader */
 extern unsigned long bus_clock, cpu_clock_freq;
 extern unsigned long memsize, highmemsize;
@@ -30,6 +34,13 @@ extern void __init prom_init_memory(void);
 extern void __init prom_init_cmdline(void);
 extern void __init prom_init_env(void);
 
+/* irq operation functions */
+extern void bonito_irqdispatch(void);
+extern void __init bonito_irq_init(void);
+extern void __init set_irq_trigger_mode(void);
+extern void __init mach_init_irq(void);
+extern void mach_irq_dispatch(unsigned int pending);
+
 /* PCI Configuration Registers */
 #define LOONGSON_PCI_ISR4C  BONITO_PCI_REG(0x4c)
 

arch/mips/include/asm/mach-loongson/machine.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2009 Lemote, Inc. & Institute of Computing Technology
+ * 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.
+ */
+
+#ifndef __ASM_MACH_LOONGSON_MACHINE_H
+#define __ASM_MACH_LOONGSON_MACHINE_H
+
+#ifdef CONFIG_LEMOTE_FULOONG2E
+
+#define LOONGSON_UART_BASE (BONITO_PCIIO_BASE + 0x3f8)
+
+#define LOONGSON_MACHNAME "lemote-fuloong-2e-box"
+
+#endif
+
+#endif /* __ASM_MACH_LOONGSON_MACHINE_H */

arch/mips/include/asm/mach-loongson/mem.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2009 Lemote, Inc. & Institute of Computing Technology
+ * 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.
+ */
+
+#ifndef __ASM_MACH_LOONGSON_MEM_H
+#define __ASM_MACH_LOONGSON_MEM_H
+
+/*
+ * On Lemote Loongson 2e
+ *
+ * the high memory space starts from 512M.
+ * the peripheral registers reside between 0x1000:0000 and 0x2000:0000.
+ */
+
+#ifdef CONFIG_LEMOTE_FULOONG2E
+
+#define LOONGSON_HIGHMEM_START  0x20000000
+
+#define LOONGSON_MMIO_MEM_START 0x10000000
+#define LOONGSON_MMIO_MEM_END   0x20000000
+
+#endif
+
+#endif /* __ASM_MACH_LOONGSON_MEM_H */

arch/mips/include/asm/mach-loongson/pci.h

@@ -24,8 +24,14 @@
 
 extern struct pci_ops bonito64_pci_ops;
 
-#define LOONGSON2E_PCI_MEM_START	BONITO_PCILO1_BASE
-#define LOONGSON2E_PCI_MEM_END		(BONITO_PCILO1_BASE + 0x04000000 * 2)
-#define LOONGSON2E_PCI_IO_START		0x00004000UL
+#ifdef CONFIG_LEMOTE_FULOONG2E
+
+/* this pci memory space is mapped by pcimap in pci.c */
+#define LOONGSON_PCI_MEM_START	BONITO_PCILO1_BASE
+#define LOONGSON_PCI_MEM_END	(BONITO_PCILO1_BASE + 0x04000000 * 2)
+/* this is an offset from mips_io_port_base */
+#define LOONGSON_PCI_IO_START	0x00004000UL
+
+#endif
 
 #endif /* !__ASM_MACH_LOONGSON_PCI_H_ */

arch/mips/loongson/Kconfig

@@ -0,0 +1,31 @@
+choice
+    prompt "Machine Type"
+    depends on MACH_LOONGSON
+
+config LEMOTE_FULOONG2E
+    bool "Lemote Fuloong(2e) mini-PC"
+    select ARCH_SPARSEMEM_ENABLE
+    select CEVT_R4K
+    select CSRC_R4K
+    select SYS_HAS_CPU_LOONGSON2
+    select DMA_NONCOHERENT
+    select BOOT_ELF32
+    select BOARD_SCACHE
+    select HW_HAS_PCI
+    select I8259
+    select ISA
+    select IRQ_CPU
+    select SYS_SUPPORTS_32BIT_KERNEL
+    select SYS_SUPPORTS_64BIT_KERNEL
+    select SYS_SUPPORTS_LITTLE_ENDIAN
+    select SYS_SUPPORTS_HIGHMEM
+    select SYS_HAS_EARLY_PRINTK
+    select GENERIC_HARDIRQS_NO__DO_IRQ
+    select GENERIC_ISA_DMA_SUPPORT_BROKEN
+    select CPU_HAS_WB
+    help
+      Lemote Fuloong(2e) mini-PC board based on the Chinese Loongson-2E CPU and
+      an FPGA northbridge
+
+      Lemote Fuloong(2e) mini PC have a VIA686B south bridge.
+endchoice

arch/mips/loongson/Makefile

@@ -0,0 +1,11 @@
+#
+# Common code for all Loongson based systems
+#
+
+obj-$(CONFIG_MACH_LOONGSON) += common/
+
+#
+# Lemote Fuloong mini-PC (Loongson 2E-based)
+#
+
+obj-$(CONFIG_LEMOTE_FULOONG2E)  += fuloong-2e/

arch/mips/loongson/common/Makefile

@@ -0,0 +1,11 @@
+#
+# Makefile for loongson based machines.
+#
+
+obj-y += setup.o init.o cmdline.o env.o time.o reset.o irq.o \
+    pci.o bonito-irq.o mem.o
+
+#
+# Early printk support
+#
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o

arch/mips/loongson/fuloong-2e/early_printk.c → arch/mips/loongson/common/early_printk.c

@@ -12,8 +12,7 @@
 #include <linux/serial_reg.h>
 
 #include <loongson.h>
-
-#define UART_BASE (BONITO_PCIIO_BASE + 0x3f8)
+#include <machine.h>
 
 #define PORT(base, offset) (u8 *)(base + offset)
 
@@ -30,7 +29,7 @@ static inline void serial_out(phys_addr_t base, int offset, int value)
 void prom_putchar(char c)
 {
 	phys_addr_t uart_base =
-		(phys_addr_t) ioremap_nocache(UART_BASE, 8);
+		(phys_addr_t) ioremap_nocache(LOONGSON_UART_BASE, 8);
 
 	while ((serial_in(uart_base, UART_LSR) & UART_LSR_THRE) == 0)
 		;

arch/mips/loongson/common/irq.c

@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology
+ * 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/delay.h>
+#include <linux/interrupt.h>
+
+#include <loongson.h>
+/*
+ * the first level int-handler will jump here if it is a bonito irq
+ */
+void bonito_irqdispatch(void)
+{
+	u32 int_status;
+	int i;
+
+	/* workaround the IO dma problem: let cpu looping to allow DMA finish */
+	int_status = BONITO_INTISR;
+	if (int_status & (1 << 10)) {
+		while (int_status & (1 << 10)) {
+			udelay(1);
+			int_status = BONITO_INTISR;
+		}
+	}
+
+	/* Get pending sources, masked by current enables */
+	int_status = BONITO_INTISR & BONITO_INTEN;
+
+	if (int_status != 0) {
+		i = __ffs(int_status);
+		int_status &= ~(1 << i);
+		do_IRQ(BONITO_IRQ_BASE + i);
+	}
+}
+
+asmlinkage void plat_irq_dispatch(void)
+{
+	unsigned int pending;
+
+	pending = read_c0_cause() & read_c0_status() & ST0_IM;
+
+	/* machine-specific plat_irq_dispatch */
+	mach_irq_dispatch(pending);
+}
+
+void __init arch_init_irq(void)
+{
+	/*
+	 * Clear all of the interrupts while we change the able around a bit.
+	 * int-handler is not on bootstrap
+	 */
+	clear_c0_status(ST0_IM | ST0_BEV);
+	local_irq_disable();
+
+	/* setting irq trigger mode */
+	set_irq_trigger_mode();
+
+	/* no steer */
+	BONITO_INTSTEER = 0;
+
+	/*
+	 * Mask out all interrupt by writing "1" to all bit position in
+	 * the interrupt reset reg.
+	 */
+	BONITO_INTENCLR = ~0;
+
+	/* machine specific irq init */
+	mach_init_irq();
+}

arch/mips/loongson/fuloong-2e/machtype.c → arch/mips/loongson/common/machtype.c

@@ -8,8 +8,10 @@
  * option) any later version.
  */
 
+#include <machine.h>
+
 const char *get_system_type(void)
 {
-	return "lemote-fuloong-2e-box";
+	return LOONGSON_MACHNAME;
 }
 

arch/mips/loongson/fuloong-2e/mem.c → arch/mips/loongson/common/mem.c

@@ -11,13 +11,15 @@
 #include <asm/bootinfo.h>
 
 #include <loongson.h>
+#include <mem.h>
 
 void __init prom_init_memory(void)
 {
     add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
 #ifdef CONFIG_64BIT
     if (highmemsize > 0)
-		add_memory_region(0x20000000, highmemsize << 20, BOOT_MEM_RAM);
+	add_memory_region(LOONGSON_HIGHMEM_START,
+		highmemsize << 20, BOOT_MEM_RAM);
 #endif /* CONFIG_64BIT */
 }
 
@@ -27,10 +29,7 @@ int __uncached_access(struct file *file, unsigned long addr)
 	if (file->f_flags & O_SYNC)
 		return 1;
 
-	/*
-	 * On the Lemote Loongson 2e system, the peripheral registers
-	 * reside between 0x1000:0000 and 0x2000:0000.
-	 */
 	return addr >= __pa(high_memory) ||
-		((addr >= 0x10000000) && (addr < 0x20000000));
+		((addr >= LOONGSON_MMIO_MEM_START) &&
+		 (addr < LOONGSON_MMIO_MEM_END));
 }

arch/mips/loongson/fuloong-2e/pci.c → arch/mips/loongson/common/pci.c

@@ -12,24 +12,24 @@
 #include <pci.h>
 #include <loongson.h>
 
-static struct resource loongson2e_pci_mem_resource = {
-	.name   = "LOONGSON2E PCI MEM",
-	.start  = LOONGSON2E_PCI_MEM_START,
-	.end    = LOONGSON2E_PCI_MEM_END,
+static struct resource loongson_pci_mem_resource = {
+	.name   = "pci memory space",
+	.start  = LOONGSON_PCI_MEM_START,
+	.end    = LOONGSON_PCI_MEM_END,
 	.flags  = IORESOURCE_MEM,
 };
 
-static struct resource loongson2e_pci_io_resource = {
-	.name   = "LOONGSON2E PCI IO MEM",
-	.start  = LOONGSON2E_PCI_IO_START,
+static struct resource loongson_pci_io_resource = {
+	.name   = "pci io space",
+	.start  = LOONGSON_PCI_IO_START,
 	.end    = IO_SPACE_LIMIT,
 	.flags  = IORESOURCE_IO,
 };
 
-static struct pci_controller  loongson2e_pci_controller = {
+static struct pci_controller  loongson_pci_controller = {
 	.pci_ops        = &bonito64_pci_ops,
-	.io_resource    = &loongson2e_pci_io_resource,
-	.mem_resource   = &loongson2e_pci_mem_resource,
+	.io_resource    = &loongson_pci_io_resource,
+	.mem_resource   = &loongson_pci_mem_resource,
 	.mem_offset     = 0x00000000UL,
 	.io_offset      = 0x00000000UL,
 };
@@ -73,9 +73,9 @@ static int __init pcibios_init(void)
 {
 	setup_pcimap();
 
-	loongson2e_pci_controller.io_map_base = mips_io_port_base;
+	loongson_pci_controller.io_map_base = mips_io_port_base;
 
-	register_pci_controller(&loongson2e_pci_controller);
+	register_pci_controller(&loongson_pci_controller);
 
 	return 0;
 }