patch-2.1.116 linux/arch/alpha/kernel/sys_takara.c

• Lines: 166
• Date: Sun Aug 9 12:09:05 1998
• Orig file: v2.1.115/linux/arch/alpha/kernel/sys_takara.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.115/linux/arch/alpha/kernel/sys_takara.c linux/arch/alpha/kernel/sys_takara.c
@@ -0,0 +1,165 @@
+/*
+ *	linux/arch/alpha/kernel/sys_takara.c
+ *
+ *	Copyright (C) 1995 David A Rusling
+ *	Copyright (C) 1996 Jay A Estabrook
+ *	Copyright (C) 1998 Richard Henderson
+ *
+ * Code supporting the TAKARA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+
+#include <asm/ptrace.h>
+#include <asm/system.h>
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/core_cia.h>
+
+#include "proto.h"
+#include "irq.h"
+#include "bios32.h"
+#include "machvec.h"
+
+
+/*
+ * WARNING WARNING WARNING
+ *
+ * This port is missing an update_irq_hw implementation.
+ */
+
+static void
+takara_device_interrupt(unsigned long vector, struct pt_regs *regs)
+{
+	unsigned long flags;
+	unsigned intstatus;
+
+	save_and_cli(flags);
+
+	/*
+	 * The PALcode will have passed us vectors 0x800 or 0x810,
+	 * which are fairly arbitrary values and serve only to tell
+	 * us whether an interrupt has come in on IRQ0 or IRQ1. If
+	 * it's IRQ1 it's a PCI interrupt; if it's IRQ0, it's
+	 * probably ISA, but PCI interrupts can come through IRQ0
+	 * as well if the interrupt controller isn't in accelerated
+	 * mode.
+	 *
+	 * OTOH, the accelerator thing doesn't seem to be working
+	 * overly well, so what we'll do instead is try directly
+	 * examining the Master Interrupt Register to see if it's a
+	 * PCI interrupt, and if _not_ then we'll pass it on to the
+	 * ISA handler.
+	 */
+
+	intstatus = inw(0x500) & 15;
+	if (intstatus) {
+		/*
+		 * This is a PCI interrupt. Check each bit and
+		 * despatch an interrupt if it's set.
+		 */
+
+		if (intstatus & 8) handle_irq(16+3, 16+3, regs);
+		if (intstatus & 4) handle_irq(16+2, 16+2, regs);
+		if (intstatus & 2) handle_irq(16+1, 16+1, regs);
+		if (intstatus & 1) handle_irq(16+0, 16+0, regs);
+	} else
+		isa_device_interrupt (vector, regs);
+
+	restore_flags(flags);
+}
+
+static void __init
+takara_init_irq(void)
+{
+	unsigned int ctlreg;
+
+	STANDARD_INIT_IRQ_PROLOG;
+
+	ctlreg = inl(0x500);
+	ctlreg &= ~0x8000;     /* return to non-accelerated mode */
+	outw(ctlreg >> 16, 0x502);
+	outw(ctlreg & 0xFFFF, 0x500);
+	ctlreg = 0x05107c00;   /* enable the PCI interrupt register */
+	outw(ctlreg >> 16, 0x502);
+	outw(ctlreg & 0xFFFF, 0x500);
+	enable_irq(2);
+}
+
+
+/*
+ * The Takara has PCI devices 1, 2, and 3 configured to slots 20,
+ * 19, and 18 respectively, in the default configuration. They can
+ * also be jumpered to slots 8, 7, and 6 respectively, which is fun
+ * because the SIO ISA bridge can also be slot 7. However, the SIO
+ * doesn't explicitly generate PCI-type interrupts, so we can
+ * assign it whatever the hell IRQ we like and it doesn't matter.
+ */
+
+static int __init
+takara_map_irq(struct pci_dev *dev, int slot, int pin)
+{
+	static char irq_tab[15][5] __initlocaldata = {
+		{ 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot  6 == device 3 */
+		{ 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot  7 == device 2 */
+		{ 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot  8 == device 1 */
+		{   -1,   -1,   -1,   -1,   -1},   /* slot  9 == nothing */
+		{   -1,   -1,   -1,   -1,   -1},   /* slot 10 == nothing */
+		{   -1,   -1,   -1,   -1,   -1},   /* slot 11 == nothing */
+		{   -1,   -1,   -1,   -1,   -1},   /* slot 12 == nothing */
+		{   -1,   -1,   -1,   -1,   -1},   /* slot 13 == nothing */
+		{   -1,   -1,   -1,   -1,   -1},   /* slot 14 == nothing */
+		{   -1,   -1,   -1,   -1,   -1},   /* slot 15 == nothing */
+		{   -1,   -1,   -1,   -1,   -1},   /* slot 16 == nothing */
+		{   -1,   -1,   -1,   -1,   -1},   /* slot 17 == nothing */
+		{ 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot 18 == device 3 */
+		{ 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot 19 == device 2 */
+		{ 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot 20 == device 1 */
+	};
+	const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
+	return COMMON_TABLE_LOOKUP;
+}
+
+static void __init
+takara_pci_fixup(void)
+{
+	layout_all_busses(DEFAULT_IO_BASE, DEFAULT_MEM_BASE);
+	common_pci_fixup(takara_map_irq, common_swizzle);
+	enable_ide(0x26e);
+}
+
+
+/*
+ * The System Vector
+ */
+
+struct alpha_machine_vector takara_mv __initmv = {
+	vector_name:		"Takara",
+	DO_EV5_MMU,
+	DO_DEFAULT_RTC,
+	DO_CIA_IO,
+	DO_CIA_BUS,
+	machine_check:		cia_machine_check,
+	max_dma_address:	ALPHA_MAX_DMA_ADDRESS,
+
+	nr_irqs:		20,
+	irq_probe_mask:		_PROBE_MASK(20),
+	update_irq_hw:		NULL,
+	ack_irq:		generic_ack_irq,
+	device_interrupt:	takara_device_interrupt,
+
+	init_arch:		cia_init_arch,
+	init_irq:		takara_init_irq,
+	init_pit:		generic_init_pit,
+	pci_fixup:		takara_pci_fixup,
+	kill_arch:		generic_kill_arch,
+};
+ALIAS_MV(takara)