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

• Lines: 302
• Date: Sun Aug 9 12:09:05 1998
• Orig file: v2.1.115/linux/arch/alpha/kernel/sys_noritake.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.115/linux/arch/alpha/kernel/sys_noritake.c linux/arch/alpha/kernel/sys_noritake.c
@@ -0,0 +1,301 @@
+/*
+ *	linux/arch/alpha/kernel/sys_noritake.c
+ *
+ *	Copyright (C) 1995 David A Rusling
+ *	Copyright (C) 1996 Jay A Estabrook
+ *	Copyright (C) 1998 Richard Henderson
+ *
+ * Code supporting the NORITAKE (AlphaServer 1000A), 
+ * CORELLE (AlphaServer 800), and ALCOR Primo (AlphaStation 600A).
+ */
+
+#include <linux/config.h>
+#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/pgtable.h>
+#include <asm/core_apecs.h>
+#include <asm/core_cia.h>
+
+#include "proto.h"
+#include "irq.h"
+#include "bios32.h"
+#include "machvec.h"
+
+
+static void 
+noritake_update_irq_hw(unsigned long irq, unsigned long mask, int unmask_p)
+{
+	if (irq <= 15)
+		if (irq <= 7)
+			outb(mask, 0x21);	/* ISA PIC1 */
+		else
+			outb(mask >> 8, 0xA1);	/* ISA PIC2 */
+	else if (irq <= 31)
+		outw(~(mask >> 16), 0x54a);
+	else
+		outw(~(mask >> 32), 0x54c);
+}
+
+static void 
+noritake_device_interrupt(unsigned long vector, struct pt_regs *regs)
+{
+	unsigned long pld;
+	unsigned int i;
+	unsigned long flags;
+
+	save_and_cli(flags);
+
+	/* Read the interrupt summary registers of NORITAKE */
+	pld = ((unsigned long) inw(0x54c) << 32) |
+		((unsigned long) inw(0x54a) << 16) |
+		((unsigned long) inb(0xa0)  <<  8) |
+		((unsigned long) inb(0x20));
+
+	/*
+	 * Now for every possible bit set, work through them and call
+	 * the appropriate interrupt handler.
+	 */
+	while (pld) {
+		i = ffz(~pld);
+		pld &= pld - 1; /* clear least bit set */
+		if (i < 16) {
+			isa_device_interrupt(vector, regs);
+		} else {
+			handle_irq(i, i, regs);
+		}
+	}
+	restore_flags(flags);
+}
+
+static void 
+noritake_srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
+{
+	int irq, ack;
+	unsigned long flags;
+
+	__save_and_cli(flags);
+	ack = irq = (vector - 0x800) >> 4;
+
+	/*
+	 * I really hate to do this, too, but the NORITAKE SRM console also
+	 *  reports PCI vectors *lower* than I expected from the bit numbers
+	 *  in the documentation.
+	 * But I really don't want to change the fixup code for allocation
+	 *  of IRQs, nor the alpha_irq_mask maintenance stuff, both of which
+	 *  look nice and clean now.
+	 * So, here's this additional grotty hack... :-(
+	 */
+	if (irq >= 16)
+		ack = irq = irq + 1;
+
+	handle_irq(irq, ack, regs);
+	__restore_flags(flags);
+}
+
+static void __init
+noritake_init_irq(void)
+{
+	STANDARD_INIT_IRQ_PROLOG;
+
+	if (alpha_using_srm)
+		alpha_mv.device_interrupt = noritake_srm_device_interrupt;
+
+	outw(~(alpha_irq_mask >> 16), 0x54a); /* note invert */
+	outw(~(alpha_irq_mask >> 32), 0x54c); /* note invert */
+	enable_irq(2);			/* enable cascade */
+}
+
+
+/*
+ * PCI Fixup configuration.
+ *
+ * Summary @ 0x542, summary register #1:
+ * Bit      Meaning
+ * 0        All valid ints from summary regs 2 & 3
+ * 1        QLOGIC ISP1020A SCSI
+ * 2        Interrupt Line A from slot 0
+ * 3        Interrupt Line B from slot 0
+ * 4        Interrupt Line A from slot 1
+ * 5        Interrupt line B from slot 1
+ * 6        Interrupt Line A from slot 2
+ * 7        Interrupt Line B from slot 2
+ * 8        Interrupt Line A from slot 3
+ * 9        Interrupt Line B from slot 3
+ *10        Interrupt Line A from slot 4
+ *11        Interrupt Line B from slot 4
+ *12        Interrupt Line A from slot 5
+ *13        Interrupt Line B from slot 5
+ *14        Interrupt Line A from slot 6
+ *15        Interrupt Line B from slot 6
+ *
+ * Summary @ 0x544, summary register #2:
+ * Bit      Meaning
+ * 0        OR of all unmasked ints in SR #2
+ * 1        OR of secondary bus ints
+ * 2        Interrupt Line C from slot 0
+ * 3        Interrupt Line D from slot 0
+ * 4        Interrupt Line C from slot 1
+ * 5        Interrupt line D from slot 1
+ * 6        Interrupt Line C from slot 2
+ * 7        Interrupt Line D from slot 2
+ * 8        Interrupt Line C from slot 3
+ * 9        Interrupt Line D from slot 3
+ *10        Interrupt Line C from slot 4
+ *11        Interrupt Line D from slot 4
+ *12        Interrupt Line C from slot 5
+ *13        Interrupt Line D from slot 5
+ *14        Interrupt Line C from slot 6
+ *15        Interrupt Line D from slot 6
+ *
+ * The device to slot mapping looks like:
+ *
+ * Slot     Device
+ *  7       Intel PCI-EISA bridge chip
+ *  8       DEC PCI-PCI bridge chip
+ * 11       PCI on board slot 0
+ * 12       PCI on board slot 1
+ * 13       PCI on board slot 2
+ *   
+ *
+ * This two layered interrupt approach means that we allocate IRQ 16 and 
+ * above for PCI interrupts.  The IRQ relates to which bit the interrupt
+ * comes in on.  This makes interrupt processing much easier.
+ */
+
+static int __init
+noritake_map_irq(struct pci_dev *dev, int slot, int pin)
+{
+	static char irq_tab[15][5] __initlocaldata = {
+		/*INT    INTA   INTB   INTC   INTD */
+		/* note: IDSELs 16, 17, and 25 are CORELLE only */
+		{ 16+1,  16+1,  16+1,  16+1,  16+1},  /* IdSel 16,  QLOGIC */
+		{   -1,    -1,    -1,    -1,    -1},  /* IdSel 17, S3 Trio64 */
+		{   -1,    -1,    -1,    -1,    -1},  /* IdSel 18,  PCEB */
+		{   -1,    -1,    -1,    -1,    -1},  /* IdSel 19,  PPB  */
+		{   -1,    -1,    -1,    -1,    -1},  /* IdSel 20,  ???? */
+		{   -1,    -1,    -1,    -1,    -1},  /* IdSel 21,  ???? */
+		{ 16+2,  16+2,  16+3,  32+2,  32+3},  /* IdSel 22,  slot 0 */
+		{ 16+4,  16+4,  16+5,  32+4,  32+5},  /* IdSel 23,  slot 1 */
+		{ 16+6,  16+6,  16+7,  32+6,  32+7},  /* IdSel 24,  slot 2 */
+		{ 16+8,  16+8,  16+9,  32+8,  32+9},	/* IdSel 25,  slot 3 */
+		/* The following 5 are actually on PCI bus 1, which is 
+		   across the built-in bridge of the NORITAKE only.  */
+		{ 16+1,  16+1,  16+1,  16+1,  16+1},  /* IdSel 16,  QLOGIC */
+		{ 16+8,  16+8,  16+9,  32+8,  32+9},  /* IdSel 17,  slot 3 */
+		{16+10, 16+10, 16+11, 32+10, 32+11},  /* IdSel 18,  slot 4 */
+		{16+12, 16+12, 16+13, 32+12, 32+13},  /* IdSel 19,  slot 5 */
+		{16+14, 16+14, 16+15, 32+14, 32+15},  /* IdSel 20,  slot 6 */
+	};
+	const long min_idsel = 5, max_idsel = 19, irqs_per_slot = 5;
+	return COMMON_TABLE_LOOKUP;
+}
+
+static int __init
+noritake_swizzle(struct pci_dev *dev, int *pinp)
+{
+	int slot, pin = *pinp;
+
+	/* Check first for the built-in bridge */
+	if (PCI_SLOT(dev->bus->self->devfn) == 8) {
+		slot = PCI_SLOT(dev->devfn) + 15; /* WAG! */
+	}
+	else
+	{
+		/* Must be a card-based bridge.  */
+		do {
+			if (PCI_SLOT(dev->bus->self->devfn) == 8) {
+				slot = PCI_SLOT(dev->devfn) + 15;
+				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
+noritake_pci_fixup(void)
+{
+	layout_all_busses(EISA_DEFAULT_IO_BASE,APECS_AND_LCA_DEFAULT_MEM_BASE);
+	common_pci_fixup(noritake_map_irq, noritake_swizzle);
+}
+
+static void __init
+noritake_primo_pci_fixup(void)
+{
+	layout_all_busses(EISA_DEFAULT_IO_BASE, DEFAULT_MEM_BASE);
+	common_pci_fixup(noritake_map_irq, noritake_swizzle);
+}
+
+
+/*
+ * The System Vectors
+ */
+
+#if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
+struct alpha_machine_vector noritake_mv __initmv = {
+	vector_name:		"Noritake",
+	DO_EV4_MMU,
+	DO_DEFAULT_RTC,
+	DO_APECS_IO,
+	DO_APECS_BUS,
+	machine_check:		apecs_machine_check,
+	max_dma_address:	ALPHA_MAX_DMA_ADDRESS,
+
+	nr_irqs:		48,
+	irq_probe_mask:		_PROBE_MASK(48),
+	update_irq_hw:		noritake_update_irq_hw,
+	ack_irq:		generic_ack_irq,
+	device_interrupt:	noritake_device_interrupt,
+
+	init_arch:		apecs_init_arch,
+	init_irq:		noritake_init_irq,
+	init_pit:		generic_init_pit,
+	pci_fixup:		noritake_pci_fixup,
+	kill_arch:		generic_kill_arch,
+};
+ALIAS_MV(noritake)
+#endif
+
+#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PRIMO)
+struct alpha_machine_vector noritake_primo_mv __initmv = {
+	vector_name:		"Noritake-Primo",
+	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:		48,
+	irq_probe_mask:		_PROBE_MASK(48),
+	update_irq_hw:		noritake_update_irq_hw,
+	ack_irq:		generic_ack_irq,
+	device_interrupt:	noritake_device_interrupt,
+
+	init_arch:		cia_init_arch,
+	init_irq:		noritake_init_irq,
+	init_pit:		generic_init_pit,
+	pci_fixup:		noritake_primo_pci_fixup,
+	kill_arch:		generic_kill_arch,
+};
+ALIAS_MV(noritake_primo)
+#endif