patch-2.2.14 linux/arch/alpha/kernel/sys_eiger.c

• Lines: 238
• Date: Tue Jan 4 10:12:11 2000
• Orig file: v2.2.13/linux/arch/alpha/kernel/sys_eiger.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.13/linux/arch/alpha/kernel/sys_eiger.c linux/arch/alpha/kernel/sys_eiger.c
@@ -0,0 +1,237 @@
+/*
+ *	linux/arch/alpha/kernel/sys_eiger.c
+ *
+ *	Copyright (C) 1995 David A Rusling
+ *	Copyright (C) 1996, 1999 Jay A Estabrook
+ *	Copyright (C) 1998, 1999 Richard Henderson
+ *	Copyright (C) 1999 Iain Grant
+ *
+ * Code supporting the EIGER (EV6+TSUNAMI).
+ */
+
+#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/bitops.h>
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+#include <asm/pci.h>
+#include <asm/pgtable.h>
+#include <asm/core_tsunami.h>
+#include <asm/hwrpb.h>
+
+#include "proto.h"
+#include "irq.h"
+#include "bios32.h"
+#include "machvec.h"
+
+#define dev2hose(d) (bus2hose[(d)->bus->number]->pci_hose_index)
+
+/*
+ * HACK ALERT! only the boot cpu is used for interrupts.
+ */
+
+static void
+eiger_update_irq_hw(unsigned long irq, unsigned long unused, int unmask_p)
+{
+
+	unsigned int regaddr;
+	unsigned long mask;
+
+	if (irq <= 15) {
+		if (irq <= 7)
+			outb(alpha_irq_mask, 0x21);		/* ISA PIC1 */
+	else
+			outb(alpha_irq_mask >> 8, 0xA1);	/* ISA PIC2 */
+	} else {
+		if (irq > 63)
+			mask = _alpha_irq_masks[1] << 16;
+		else
+			mask = _alpha_irq_masks[0] >> ((irq - 16) & 0x30);
+
+		regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c);
+
+		outl(mask & 0xffff0000UL, regaddr);
+	}
+
+}
+
+static void
+eiger_device_interrupt(unsigned long vector, struct pt_regs * regs)
+{
+	unsigned intstatus;
+
+	/*
+	 * 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);
+}
+
+
+static void
+eiger_srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
+{
+   int irq = (vector - 0x800) >> 4;
+
+   handle_irq(irq, irq, regs);
+
+}
+
+static void __init
+eiger_init_irq(void)
+{
+	outb(0, DMA1_RESET_REG);
+	outb(0, DMA2_RESET_REG);
+	outb(DMA_MODE_CASCADE, DMA2_MODE_REG);
+	outb(0, DMA2_MASK_REG);
+
+	if (alpha_using_srm)
+		alpha_mv.device_interrupt = eiger_srm_device_interrupt;
+
+	eiger_update_irq_hw(16, alpha_irq_mask, 0);
+
+	enable_irq(2);
+}
+
+static int __init
+eiger_map_irq(struct pci_dev *dev, int slot, int pin)
+{
+	u8 irq_orig;
+	int irq;
+
+	/* The SRM console has already calculated out the IRQ value's for
+	   option cards. As this works lets just read in the value already
+	   set and change it to a useable value by Linux.
+
+	   All the IRQ values generated by the console are greater than 90,
+	   so we calculate a value for Linux by the following:
+
+	   irq = (card Irq - 80);
+
+	   We subtract 80 because it is (90 - allocated ISA IRQ's ).
+	*/
+	pcibios_read_config_byte(dev->bus->number,
+				 dev->devfn,
+				 PCI_INTERRUPT_LINE,
+				 &irq_orig);
+
+	irq = ( irq_orig - 0x80);
+
+	return irq;
+}
+
+/* New swizzle routine with code for card based bridges */
+static int __init
+eiger_swizzle(struct pci_dev *dev, int *pinp)
+{
+	int slot, pin = *pinp;
+	int bridge_count = 0;
+
+	/* Find the number of backplane bridges */
+	int backplane = ( inw(0x502) & 0x0f);
+
+	switch (backplane)
+	{
+	   case 0x00: bridge_count = 0; break; /* No bridges */
+	   case 0x01: bridge_count = 1; break; /* 1 */
+	   case 0x03: bridge_count = 2; break; /* 2 */
+	   case 0x07: bridge_count = 3; break; /* 3 */
+	   case 0x0f: bridge_count = 4; break; /* 4 */
+	};
+
+
+	/*  Check first for the built-in bridges on hose 0. */
+	if ( dev2hose(dev) == 0 &&
+            ( (PCI_SLOT(dev->bus->self->devfn) > (20-bridge_count))))
+	{
+		slot = PCI_SLOT(dev->devfn);
+	} else {
+		/*  Must be a card-based bridge.  */
+		do {
+			/* Check for built-in bridges on hose 0. */
+			if ( dev2hose(dev) == 0 &&
+			     (PCI_SLOT(dev->bus->self->devfn) >
+				(20 - bridge_count)))
+			{
+                  		slot = PCI_SLOT(dev->devfn);
+				break;
+			}
+			pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn)) ;
+
+			/* Move up the chain of bridges.  */
+			dev = dev->bus->self;
+			/* Slot of the next bridge.  */
+			slot = PCI_SLOT(dev->devfn);
+		} while (dev->bus->self);
+	}
+	*pinp = pin;
+
+	return slot;
+}
+
+static void __init
+eiger_pci_fixup(void)
+{
+	layout_all_busses(DEFAULT_IO_BASE, DEFAULT_MEM_BASE);
+	common_pci_fixup(eiger_map_irq, eiger_swizzle);
+}
+
+/*
+ * The System Vectors
+ */
+
+struct alpha_machine_vector eiger_mv __initmv = {
+	vector_name:		"Eiger",
+	DO_EV6_MMU,
+	DO_DEFAULT_RTC,
+	DO_TSUNAMI_IO,
+	DO_TSUNAMI_BUS,
+	machine_check:		tsunami_machine_check,
+	max_dma_address:	ALPHA_MAX_DMA_ADDRESS,
+
+	nr_irqs:		128,
+	irq_probe_mask:		TSUNAMI_PROBE_MASK,
+	update_irq_hw:		eiger_update_irq_hw,
+	ack_irq:		generic_ack_irq,
+	device_interrupt:	eiger_device_interrupt,
+
+	init_arch:		tsunami_init_arch,
+	init_irq:		eiger_init_irq,
+	init_pit:		generic_init_pit,
+	pci_fixup:		eiger_pci_fixup,
+	kill_arch:		generic_kill_arch,
+};
+ALIAS_MV(eiger)