Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

6 files changed, 598 insertions, 0 deletions

diff --git a/arch/mips/sni/Makefile b/arch/mips/sni/Makefile
new file mode 100644
index 0000000..1e5676e
--- /dev/null
+++ b/arch/mips/sni/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the SNI specific part of the kernel
+#
+
+obj-y	 	+= int-handler.o irq.o pcimt_scache.o reset.o setup.o
+
+EXTRA_AFLAGS := $(CFLAGS)
diff --git a/arch/mips/sni/int-handler.S b/arch/mips/sni/int-handler.S
new file mode 100644
index 0000000..2cdc09f
--- /dev/null
+++ b/arch/mips/sni/int-handler.S
@@ -0,0 +1,106 @@
+/*
+ * SNI RM200 PCI specific interrupt handler code.
+ *
+ * Copyright (C) 1994, 95, 96, 97, 98, 1999, 2000, 01 by Ralf Baechle
+ */
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+#include <asm/sni.h>
+#include <asm/stackframe.h>
+
+/*
+ * The PCI ASIC has the nasty property that it may delay writes if it is busy.
+ * As a consequence from writes that have not graduated when we exit from the
+ * interrupt handler we might catch a spurious interrupt.  To avoid this we
+ * force the PCI ASIC to graduate all writes by executing a read from the
+ * PCI bus.
+ */
+		.set	noreorder
+		.set	noat
+		.align	5
+		NESTED(sni_rm200_pci_handle_int, PT_SIZE, sp)
+		SAVE_ALL
+		CLI
+		.set	at
+
+		/* Blinken light ...  */
+		lb	t0, led_cache
+		addiu	t0, 1
+		sb	t0, led_cache
+		sb	t0, PCIMT_CSLED			# write only register
+		.data
+led_cache:	.byte	0
+		.text
+
+		mfc0	t0, CP0_STATUS
+		mfc0	t1, CP0_CAUSE
+		and	t0, t1
+
+		 andi	t1, t0, 0x0800			# hardware interrupt 1
+		bnez	t1, _hwint1
+		 andi	t1, t0, 0x4000			# hardware interrupt 4
+		bnez	t1, _hwint4
+		 andi	t1, t0, 0x2000			# hardware interrupt 3
+		bnez	t1, _hwint3
+		 andi	t1, t0, 0x1000			# hardware interrupt 2
+		bnez	t1, _hwint2
+		 andi	t1, t0, 0x8000			# hardware interrupt 5
+		bnez	t1, _hwint5
+		 andi	t1, t0, 0x0400			# hardware interrupt 0
+		bnez	t1, _hwint0
+		 nop
+
+		j	restore_all			# spurious interrupt
+		 nop
+
+ ##############################################################################
+
+/* hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug
+   button interrupts.  */
+_hwint0:	jal	pciasic_hwint0
+		 move	a0, sp
+		j	ret_from_irq
+		 nop
+
+/*
+ * hwint 1 deals with EISA and SCSI interrupts
+ */
+_hwint1:	jal	pciasic_hwint1
+		 move	a0, sp
+		j	ret_from_irq
+		 nop
+
+
+/*
+ * This interrupt was used for the com1 console on the first prototypes;
+ * it's unsed otherwise
+ */
+_hwint2:	jal	pciasic_hwint2
+		 move	a0, sp
+		j	ret_from_irq
+		 nop
+
+/*
+ * hwint 3 are the PCI interrupts A - D
+ */
+_hwint3:	jal	pciasic_hwint3
+		 move	a0, sp
+		j	ret_from_irq
+		 nop
+
+/*
+ * hwint 4 is used for only the onboard PCnet 32.
+ */
+_hwint4:	jal	pciasic_hwint4
+		 move	a0, sp
+		j	ret_from_irq
+		 nop
+
+/* hwint5 is the r4k count / compare interrupt  */
+_hwint5:	jal	pciasic_hwint5
+		 move	a0, sp
+		j	ret_from_irq
+		 nop
+
+		END(sni_rm200_pci_handle_int)
diff --git a/arch/mips/sni/irq.c b/arch/mips/sni/irq.c
new file mode 100644
index 0000000..62c760f
--- /dev/null
+++ b/arch/mips/sni/irq.c
@@ -0,0 +1,194 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1992 Linus Torvalds
+ * Copyright (C) 1994 - 2000 Ralf Baechle
+ */
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+
+#include <asm/i8259.h>
+#include <asm/io.h>
+#include <asm/sni.h>
+
+DEFINE_SPINLOCK(pciasic_lock);
+
+extern asmlinkage void sni_rm200_pci_handle_int(void);
+
+static void enable_pciasic_irq(unsigned int irq)
+{
+	unsigned int mask = 1 << (irq - PCIMT_IRQ_INT2);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pciasic_lock, flags);
+	*(volatile u8 *) PCIMT_IRQSEL |= mask;
+	spin_unlock_irqrestore(&pciasic_lock, flags);
+}
+
+static unsigned int startup_pciasic_irq(unsigned int irq)
+{
+	enable_pciasic_irq(irq);
+	return 0; /* never anything pending */
+}
+
+#define shutdown_pciasic_irq	disable_pciasic_irq
+
+void disable_pciasic_irq(unsigned int irq)
+{
+	unsigned int mask = ~(1 << (irq - PCIMT_IRQ_INT2));
+	unsigned long flags;
+
+	spin_lock_irqsave(&pciasic_lock, flags);
+	*(volatile u8 *) PCIMT_IRQSEL &= mask;
+	spin_unlock_irqrestore(&pciasic_lock, flags);
+}
+
+#define mask_and_ack_pciasic_irq disable_pciasic_irq
+
+static void end_pciasic_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_pciasic_irq(irq);
+}
+
+static struct hw_interrupt_type pciasic_irq_type = {
+	"ASIC-PCI",
+	startup_pciasic_irq,
+	shutdown_pciasic_irq,
+	enable_pciasic_irq,
+	disable_pciasic_irq,
+	mask_and_ack_pciasic_irq,
+	end_pciasic_irq,
+	NULL
+};
+
+/*
+ * hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug
+ * button interrupts.  Later ...
+ */
+void pciasic_hwint0(struct pt_regs *regs)
+{
+	panic("Received int0 but no handler yet ...");
+}
+
+/* This interrupt was used for the com1 console on the first prototypes.  */
+void pciasic_hwint2(struct pt_regs *regs)
+{
+	/* I think this shouldn't happen on production machines.  */
+	panic("hwint2 and no handler yet");
+}
+
+/* hwint5 is the r4k count / compare interrupt  */
+void pciasic_hwint5(struct pt_regs *regs)
+{
+	panic("hwint5 and no handler yet");
+}
+
+static unsigned int ls1bit8(unsigned int x)
+{
+	int b = 7, s;
+
+	s = 4; if ((x & 0x0f) == 0) s = 0; b -= s; x <<= s;
+	s = 2; if ((x & 0x30) == 0) s = 0; b -= s; x <<= s;
+	s = 1; if ((x & 0x40) == 0) s = 0; b -= s;
+
+	return b;
+}
+
+/*
+ * hwint 1 deals with EISA and SCSI interrupts,
+ * 
+ * The EISA_INT bit in CSITPEND is high active, all others are low active.
+ */
+void pciasic_hwint1(struct pt_regs *regs)
+{
+	u8 pend = *(volatile char *)PCIMT_CSITPEND;
+	unsigned long flags;
+
+	if (pend & IT_EISA) {
+		int irq;
+		/*
+		 * Note: ASIC PCI's builtin interrupt achknowledge feature is
+		 * broken.  Using it may result in loss of some or all i8259
+		 * interupts, so don't use PCIMT_INT_ACKNOWLEDGE ...
+		 */
+		irq = i8259_irq();
+		if (unlikely(irq < 0))
+			return;
+
+		do_IRQ(irq, regs);
+	}
+
+	if (!(pend & IT_SCSI)) {
+		flags = read_c0_status();
+		clear_c0_status(ST0_IM);
+		do_IRQ(PCIMT_IRQ_SCSI, regs);
+		write_c0_status(flags);
+	}
+}
+
+/*
+ * hwint 3 should deal with the PCI A - D interrupts,
+ */
+void pciasic_hwint3(struct pt_regs *regs)
+{
+	u8 pend = *(volatile char *)PCIMT_CSITPEND;
+	int irq;
+
+	pend &= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
+	clear_c0_status(IE_IRQ3);
+	irq = PCIMT_IRQ_INT2 + ls1bit8(pend);
+	do_IRQ(irq, regs);
+	set_c0_status(IE_IRQ3);
+}
+
+/*
+ * hwint 4 is used for only the onboard PCnet 32.
+ */
+void pciasic_hwint4(struct pt_regs *regs)
+{
+	clear_c0_status(IE_IRQ4);
+	do_IRQ(PCIMT_IRQ_ETHERNET, regs);
+	set_c0_status(IE_IRQ4);
+}
+
+void __init init_pciasic(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&pciasic_lock, flags);
+	* (volatile u8 *) PCIMT_IRQSEL =
+		IT_EISA | IT_INTA | IT_INTB | IT_INTC | IT_INTD;
+	spin_unlock_irqrestore(&pciasic_lock, flags);
+}
+
+/*
+ * On systems with i8259-style interrupt controllers we assume for
+ * driver compatibility reasons interrupts 0 - 15 to be the i8295
+ * interrupts even if the hardware uses a different interrupt numbering.
+ */
+void __init arch_init_irq(void)
+{
+	int i;
+
+	set_except_vector(0, sni_rm200_pci_handle_int);
+
+	init_i8259_irqs();			/* Integrated i8259  */
+	init_pciasic();
+
+	/* Actually we've got more interrupts to handle ...  */
+	for (i = PCIMT_IRQ_INT2; i <= PCIMT_IRQ_ETHERNET; i++) {
+		irq_desc[i].status     = IRQ_DISABLED;
+		irq_desc[i].action     = 0;
+		irq_desc[i].depth      = 1;
+		irq_desc[i].handler    = &pciasic_irq_type;
+	}
+
+	change_c0_status(ST0_IM, IE_IRQ1|IE_IRQ2|IE_IRQ3|IE_IRQ4);
+}
diff --git a/arch/mips/sni/pcimt_scache.c b/arch/mips/sni/pcimt_scache.c
new file mode 100644
index 0000000..a59d457
--- /dev/null
+++ b/arch/mips/sni/pcimt_scache.c
@@ -0,0 +1,37 @@
+/*
+ * arch/mips/sni/pcimt_scache.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 1997, 1998 by Ralf Baechle
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <asm/bcache.h>
+#include <asm/sni.h>
+
+#define cacheconf (*(volatile unsigned int *)PCIMT_CACHECONF)
+#define invspace (*(volatile unsigned int *)PCIMT_INVSPACE)
+
+void __init sni_pcimt_sc_init(void)
+{
+	unsigned int scsiz, sc_size;
+
+	scsiz = cacheconf & 7;
+	if (scsiz == 0) {
+		printk("Second level cache is deactived.\n");
+		return;
+	}
+	if (scsiz >= 6) {
+		printk("Invalid second level cache size configured, "
+		       "deactivating second level cache.\n");
+		cacheconf = 0;
+		return;
+	}
+
+	sc_size = 128 << scsiz;
+	printk("%dkb second level cache detected, deactivating.\n", sc_size);
+	cacheconf = 0;
+}
diff --git a/arch/mips/sni/reset.c b/arch/mips/sni/reset.c
new file mode 100644
index 0000000..be85bec
--- /dev/null
+++ b/arch/mips/sni/reset.c
@@ -0,0 +1,51 @@
+/*
+ *  linux/arch/mips/sni/process.c
+ *
+ *  Reset a SNI machine.
+ */
+#include <asm/io.h>
+#include <asm/reboot.h>
+#include <asm/system.h>
+#include <asm/sni.h>
+
+/*
+ * This routine reboots the machine by asking the keyboard
+ * controller to pulse the reset-line low. We try that for a while,
+ * and if it doesn't work, we do some other stupid things.
+ */
+static inline void
+kb_wait(void)
+{
+	int i;
+
+	for (i=0; i<0x10000; i++)
+		if ((inb_p(0x64) & 0x02) == 0)
+			break;
+}
+
+/* XXX This ends up at the ARC firmware prompt ...  */
+void sni_machine_restart(char *command)
+{
+	int i, j;
+
+	/* This does a normal via the keyboard controller like a PC.
+	   We can do that easier ...  */
+	local_irq_disable();
+	for (;;) {
+		for (i=0; i<100; i++) {
+			kb_wait();
+			for(j = 0; j < 100000 ; j++)
+				/* nothing */;
+			outb_p(0xfe,0x64);	 /* pulse reset low */
+		}
+	}
+}
+
+void sni_machine_halt(void)
+{
+}
+
+void sni_machine_power_off(void)
+{
+	*(volatile unsigned char *)PCIMT_CSWCSM = 0xfd;
+}
diff --git a/arch/mips/sni/setup.c b/arch/mips/sni/setup.c
new file mode 100644
index 0000000..8f67cee
--- /dev/null
+++ b/arch/mips/sni/setup.c
@@ -0,0 +1,203 @@
+/*
+ * Setup pointers to hardware-dependent routines.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1996, 97, 98, 2000, 03, 04 Ralf Baechle (ralf@linux-mips.org)
+ */
+#include <linux/config.h>
+#include <linux/eisa.h>
+#include <linux/hdreg.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/mc146818rtc.h>
+#include <linux/pci.h>
+#include <linux/console.h>
+#include <linux/fb.h>
+#include <linux/tty.h>
+
+#include <asm/arc/types.h>
+#include <asm/sgialib.h>
+#include <asm/bcache.h>
+#include <asm/bootinfo.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mc146818-time.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+#include <asm/reboot.h>
+#include <asm/sni.h>
+#include <asm/time.h>
+#include <asm/traps.h>
+
+extern void sni_machine_restart(char *command);
+extern void sni_machine_halt(void);
+extern void sni_machine_power_off(void);
+
+static void __init sni_rm200_pci_timer_setup(struct irqaction *irq)
+{
+	/* set the clock to 100 Hz */
+	outb_p(0x34,0x43);		/* binary, mode 2, LSB/MSB, ch 0 */
+	outb_p(LATCH & 0xff , 0x40);	/* LSB */
+	outb(LATCH >> 8 , 0x40);	/* MSB */
+	setup_irq(0, irq);
+}
+
+/*
+ * A bit more gossip about the iron we're running on ...
+ */
+static inline void sni_pcimt_detect(void)
+{
+	char boardtype[80];
+	unsigned char csmsr;
+	char *p = boardtype;
+	unsigned int asic;
+
+	csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
+
+	p += sprintf(p, "%s PCI", (csmsr & 0x80) ? "RM200" : "RM300");
+	if ((csmsr & 0x80) == 0)
+		p += sprintf(p, ", board revision %s",
+		             (csmsr & 0x20) ? "D" : "C");
+	asic = csmsr & 0x80;
+	asic = (csmsr & 0x08) ? asic : !asic;
+	p += sprintf(p, ", ASIC PCI Rev %s", asic ? "1.0" : "1.1");
+	printk("%s.\n", boardtype);
+}
+
+static void __init sni_display_setup(void)
+{
+#ifdef CONFIG_VT
+#if defined(CONFIG_VGA_CONSOLE)
+	struct screen_info *si = &screen_info;
+	DISPLAY_STATUS *di;
+
+	di = ArcGetDisplayStatus(1);
+
+	if (di) {
+		si->orig_x		= di->CursorXPosition;
+		si->orig_y		= di->CursorYPosition;
+		si->orig_video_cols	= di->CursorMaxXPosition;
+		si->orig_video_lines	= di->CursorMaxYPosition;
+		si->orig_video_isVGA	= VIDEO_TYPE_VGAC;
+		si->orig_video_points	= 16;
+	}
+#endif
+#endif
+}
+
+static struct resource sni_io_resource = {
+	"PCIMT IO MEM", 0x00001000UL, 0x03bfffffUL, IORESOURCE_IO,
+};
+
+static struct resource pcimt_io_resources[] = {
+	{ "dma1", 0x00, 0x1f, IORESOURCE_BUSY },
+	{ "timer", 0x40, 0x5f, IORESOURCE_BUSY },
+	{ "keyboard", 0x60, 0x6f, IORESOURCE_BUSY },
+	{ "dma page reg", 0x80, 0x8f, IORESOURCE_BUSY },
+	{ "dma2", 0xc0, 0xdf, IORESOURCE_BUSY },
+	{ "PCI config data", 0xcfc, 0xcff, IORESOURCE_BUSY }
+};
+
+static struct resource sni_mem_resource = {
+	"PCIMT PCI MEM", 0x10000000UL, 0xffffffffUL, IORESOURCE_MEM
+};
+
+/*
+ * The RM200/RM300 has a few holes in it's PCI/EISA memory address space used
+ * for other purposes.  Be paranoid and allocate all of the before the PCI
+ * code gets a chance to to map anything else there ...
+ * 
+ * This leaves the following areas available:
+ *
+ * 0x10000000 - 0x1009ffff (640kB) PCI/EISA/ISA Bus Memory
+ * 0x10100000 - 0x13ffffff ( 15MB) PCI/EISA/ISA Bus Memory
+ * 0x18000000 - 0x1fbfffff (124MB) PCI/EISA Bus Memory
+ * 0x1ff08000 - 0x1ffeffff (816kB) PCI/EISA Bus Memory
+ * 0xa0000000 - 0xffffffff (1.5GB) PCI/EISA Bus Memory
+ */
+static struct resource pcimt_mem_resources[] = {
+	{ "Video RAM area", 0x100a0000, 0x100bffff, IORESOURCE_BUSY },
+	{ "ISA Reserved", 0x100c0000, 0x100fffff, IORESOURCE_BUSY },
+	{ "PCI IO", 0x14000000, 0x17bfffff, IORESOURCE_BUSY },
+	{ "Cache Replacement Area", 0x17c00000, 0x17ffffff, IORESOURCE_BUSY},
+	{ "PCI INT Acknowledge", 0x1a000000, 0x1a000003, IORESOURCE_BUSY },
+	{ "Boot PROM", 0x1fc00000, 0x1fc7ffff, IORESOURCE_BUSY},
+	{ "Diag PROM", 0x1fc80000, 0x1fcfffff, IORESOURCE_BUSY},
+	{ "X-Bus", 0x1fd00000, 0x1fdfffff, IORESOURCE_BUSY},
+	{ "BIOS map", 0x1fe00000, 0x1fefffff, IORESOURCE_BUSY},
+	{ "NVRAM / EEPROM", 0x1ff00000, 0x1ff7ffff, IORESOURCE_BUSY},
+	{ "ASIC PCI", 0x1fff0000, 0x1fffefff, IORESOURCE_BUSY},
+	{ "MP Agent", 0x1ffff000, 0x1fffffff, IORESOURCE_BUSY},
+	{ "Main Memory", 0x20000000, 0x9fffffff, IORESOURCE_BUSY}
+};
+
+static void __init sni_resource_init(void)
+{
+	int i;
+
+	/* request I/O space for devices used on all i[345]86 PCs */
+	for (i = 0; i < ARRAY_SIZE(pcimt_io_resources); i++)
+		request_resource(&ioport_resource, pcimt_io_resources + i);
+
+	/* request mem space for pcimt-specific devices */
+	for (i = 0; i < ARRAY_SIZE(pcimt_mem_resources); i++)
+		request_resource(&sni_mem_resource, pcimt_mem_resources + i);
+
+	ioport_resource.end = sni_io_resource.end;
+}
+
+extern struct pci_ops sni_pci_ops;
+
+static struct pci_controller sni_controller = {
+	.pci_ops	= &sni_pci_ops,
+	.mem_resource	= &sni_mem_resource,
+	.mem_offset	= 0x10000000UL,
+	.io_resource	= &sni_io_resource,
+	.io_offset	= 0x00000000UL
+};
+
+static inline void sni_pcimt_time_init(void)
+{
+	rtc_get_time = mc146818_get_cmos_time;
+	rtc_set_time = mc146818_set_rtc_mmss;
+}
+
+static int __init sni_rm200_pci_setup(void)
+{
+	sni_pcimt_detect();
+	sni_pcimt_sc_init();
+	sni_pcimt_time_init();
+
+	set_io_port_base(SNI_PORT_BASE);
+	ioport_resource.end = sni_io_resource.end;
+
+	/*
+	 * Setup (E)ISA I/O memory access stuff
+	 */
+	isa_slot_offset = 0xb0000000;
+#ifdef CONFIG_EISA
+	EISA_bus = 1;
+#endif
+
+	sni_resource_init();
+	board_timer_setup = sni_rm200_pci_timer_setup;
+
+	_machine_restart = sni_machine_restart;
+	_machine_halt = sni_machine_halt;
+	_machine_power_off = sni_machine_power_off;
+
+	sni_display_setup();
+
+#ifdef CONFIG_PCI
+	register_pci_controller(&sni_controller);
+#endif
+
+	return 0;
+}
+
+early_initcall(sni_rm200_pci_setup);