256 lines
5.9 KiB
C
256 lines
5.9 KiB
C
/*
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* linux/arch/alpha/kernel/sys_eb64p.c
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*
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* Copyright (C) 1995 David A Rusling
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* Copyright (C) 1996 Jay A Estabrook
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* Copyright (C) 1998, 1999 Richard Henderson
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*
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* Code supporting the EB64+ and EB66.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <asm/ptrace.h>
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#include <asm/system.h>
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#include <asm/dma.h>
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#include <asm/irq.h>
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#include <asm/mmu_context.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/core_apecs.h>
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#include <asm/core_lca.h>
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#include <asm/hwrpb.h>
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#include <asm/tlbflush.h>
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#include "proto.h"
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#include "irq_impl.h"
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#include "pci_impl.h"
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#include "machvec_impl.h"
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/* Note mask bit is true for DISABLED irqs. */
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static unsigned int cached_irq_mask = -1;
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static inline void
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eb64p_update_irq_hw(unsigned int irq, unsigned long mask)
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{
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outb(mask >> (irq >= 24 ? 24 : 16), (irq >= 24 ? 0x27 : 0x26));
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}
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static inline void
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eb64p_enable_irq(unsigned int irq)
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{
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eb64p_update_irq_hw(irq, cached_irq_mask &= ~(1 << irq));
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}
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static void
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eb64p_disable_irq(unsigned int irq)
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{
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eb64p_update_irq_hw(irq, cached_irq_mask |= 1 << irq);
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}
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static unsigned int
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eb64p_startup_irq(unsigned int irq)
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{
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eb64p_enable_irq(irq);
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return 0; /* never anything pending */
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}
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static void
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eb64p_end_irq(unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
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eb64p_enable_irq(irq);
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}
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static struct hw_interrupt_type eb64p_irq_type = {
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.typename = "EB64P",
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.startup = eb64p_startup_irq,
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.shutdown = eb64p_disable_irq,
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.enable = eb64p_enable_irq,
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.disable = eb64p_disable_irq,
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.ack = eb64p_disable_irq,
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.end = eb64p_end_irq,
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};
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static void
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eb64p_device_interrupt(unsigned long vector)
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{
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unsigned long pld;
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unsigned int i;
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/* Read the interrupt summary registers */
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pld = inb(0x26) | (inb(0x27) << 8);
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/*
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* Now, for every possible bit set, work through
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* them and call the appropriate interrupt handler.
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*/
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while (pld) {
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i = ffz(~pld);
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pld &= pld - 1; /* clear least bit set */
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if (i == 5) {
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isa_device_interrupt(vector);
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} else {
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handle_irq(16 + i);
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}
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}
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}
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static void __init
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eb64p_init_irq(void)
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{
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long i;
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#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_CABRIOLET)
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/*
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* CABRIO SRM may not set variation correctly, so here we test
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* the high word of the interrupt summary register for the RAZ
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* bits, and hope that a true EB64+ would read all ones...
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*/
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if (inw(0x806) != 0xffff) {
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extern struct alpha_machine_vector cabriolet_mv;
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printk("Detected Cabriolet: correcting HWRPB.\n");
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hwrpb->sys_variation |= 2L << 10;
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hwrpb_update_checksum(hwrpb);
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alpha_mv = cabriolet_mv;
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alpha_mv.init_irq();
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return;
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}
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#endif /* GENERIC */
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outb(0xff, 0x26);
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outb(0xff, 0x27);
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init_i8259a_irqs();
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for (i = 16; i < 32; ++i) {
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irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
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irq_desc[i].chip = &eb64p_irq_type;
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}
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common_init_isa_dma();
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setup_irq(16+5, &isa_cascade_irqaction);
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}
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/*
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* PCI Fixup configuration.
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*
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* There are two 8 bit external summary registers as follows:
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*
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* Summary @ 0x26:
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* Bit Meaning
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* 0 Interrupt Line A from slot 0
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* 1 Interrupt Line A from slot 1
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* 2 Interrupt Line B from slot 0
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* 3 Interrupt Line B from slot 1
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* 4 Interrupt Line C from slot 0
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* 5 Interrupt line from the two ISA PICs
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* 6 Tulip
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* 7 NCR SCSI
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*
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* Summary @ 0x27
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* Bit Meaning
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* 0 Interrupt Line C from slot 1
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* 1 Interrupt Line D from slot 0
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* 2 Interrupt Line D from slot 1
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* 3 RAZ
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* 4 RAZ
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* 5 RAZ
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* 6 RAZ
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* 7 RAZ
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*
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* The device to slot mapping looks like:
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*
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* Slot Device
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* 5 NCR SCSI controller
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* 6 PCI on board slot 0
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* 7 PCI on board slot 1
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* 8 Intel SIO PCI-ISA bridge chip
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* 9 Tulip - DECchip 21040 Ethernet controller
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*
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*
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* This two layered interrupt approach means that we allocate IRQ 16 and
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* above for PCI interrupts. The IRQ relates to which bit the interrupt
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* comes in on. This makes interrupt processing much easier.
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*/
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static int __init
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eb64p_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
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{
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static char irq_tab[5][5] __initdata = {
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/*INT INTA INTB INTC INTD */
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{16+7, 16+7, 16+7, 16+7, 16+7}, /* IdSel 5, slot ?, ?? */
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{16+0, 16+0, 16+2, 16+4, 16+9}, /* IdSel 6, slot ?, ?? */
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{16+1, 16+1, 16+3, 16+8, 16+10}, /* IdSel 7, slot ?, ?? */
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{ -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
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{16+6, 16+6, 16+6, 16+6, 16+6}, /* IdSel 9, TULIP */
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};
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const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
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return COMMON_TABLE_LOOKUP;
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}
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/*
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* The System Vector
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*/
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#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB64P)
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struct alpha_machine_vector eb64p_mv __initmv = {
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.vector_name = "EB64+",
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DO_EV4_MMU,
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DO_DEFAULT_RTC,
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DO_APECS_IO,
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.machine_check = apecs_machine_check,
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.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
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.min_io_address = DEFAULT_IO_BASE,
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.min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
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.nr_irqs = 32,
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.device_interrupt = eb64p_device_interrupt,
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.init_arch = apecs_init_arch,
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.init_irq = eb64p_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = common_init_pci,
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.kill_arch = NULL,
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.pci_map_irq = eb64p_map_irq,
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.pci_swizzle = common_swizzle,
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};
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ALIAS_MV(eb64p)
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#endif
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#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB66)
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struct alpha_machine_vector eb66_mv __initmv = {
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.vector_name = "EB66",
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DO_EV4_MMU,
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DO_DEFAULT_RTC,
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DO_LCA_IO,
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.machine_check = lca_machine_check,
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.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
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.min_io_address = DEFAULT_IO_BASE,
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.min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
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.nr_irqs = 32,
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.device_interrupt = eb64p_device_interrupt,
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.init_arch = lca_init_arch,
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.init_irq = eb64p_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = common_init_pci,
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.pci_map_irq = eb64p_map_irq,
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.pci_swizzle = common_swizzle,
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};
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ALIAS_MV(eb66)
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#endif
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