1da177e4c3
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!
448 lines
12 KiB
C
448 lines
12 KiB
C
/*
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* linux/arch/alpha/kernel/sys_cabriolet.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, 2000 Richard Henderson
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*
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* Code supporting the Cabriolet (AlphaPC64), EB66+, and EB164,
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* PC164 and LX164.
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*/
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#include <linux/config.h>
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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_cia.h>
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#include <asm/core_lca.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 long cached_irq_mask = ~0UL;
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static inline void
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cabriolet_update_irq_hw(unsigned int irq, unsigned long mask)
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{
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int ofs = (irq - 16) / 8;
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outb(mask >> (16 + ofs * 8), 0x804 + ofs);
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}
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static inline void
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cabriolet_enable_irq(unsigned int irq)
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{
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cabriolet_update_irq_hw(irq, cached_irq_mask &= ~(1UL << irq));
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}
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static void
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cabriolet_disable_irq(unsigned int irq)
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{
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cabriolet_update_irq_hw(irq, cached_irq_mask |= 1UL << irq);
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}
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static unsigned int
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cabriolet_startup_irq(unsigned int irq)
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{
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cabriolet_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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cabriolet_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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cabriolet_enable_irq(irq);
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}
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static struct hw_interrupt_type cabriolet_irq_type = {
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.typename = "CABRIOLET",
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.startup = cabriolet_startup_irq,
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.shutdown = cabriolet_disable_irq,
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.enable = cabriolet_enable_irq,
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.disable = cabriolet_disable_irq,
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.ack = cabriolet_disable_irq,
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.end = cabriolet_end_irq,
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};
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static void
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cabriolet_device_interrupt(unsigned long v, struct pt_regs *r)
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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(0x804) | (inb(0x805) << 8) | (inb(0x806) << 16);
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/*
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* Now for every possible bit set, work through them and call
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* 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 == 4) {
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isa_device_interrupt(v, r);
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} else {
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handle_irq(16 + i, r);
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}
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}
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}
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static void __init
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common_init_irq(void (*srm_dev_int)(unsigned long v, struct pt_regs *r))
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{
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init_i8259a_irqs();
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if (alpha_using_srm) {
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alpha_mv.device_interrupt = srm_dev_int;
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init_srm_irqs(35, 0);
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}
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else {
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long i;
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outb(0xff, 0x804);
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outb(0xff, 0x805);
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outb(0xff, 0x806);
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for (i = 16; i < 35; ++i) {
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irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
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irq_desc[i].handler = &cabriolet_irq_type;
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}
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}
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common_init_isa_dma();
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setup_irq(16+4, &isa_cascade_irqaction);
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}
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#ifndef CONFIG_ALPHA_PC164
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static void __init
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cabriolet_init_irq(void)
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{
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common_init_irq(srm_device_interrupt);
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}
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#endif
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#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
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/* In theory, the PC164 has the same interrupt hardware as the other
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Cabriolet based systems. However, something got screwed up late
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in the development cycle which broke the interrupt masking hardware.
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Repeat, it is not possible to mask and ack interrupts. At all.
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In an attempt to work around this, while processing interrupts,
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we do not allow the IPL to drop below what it is currently. This
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prevents the possibility of recursion.
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??? Another option might be to force all PCI devices to use edge
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triggered rather than level triggered interrupts. That might be
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too invasive though. */
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static void
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pc164_srm_device_interrupt(unsigned long v, struct pt_regs *r)
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{
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__min_ipl = getipl();
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srm_device_interrupt(v, r);
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__min_ipl = 0;
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}
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static void
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pc164_device_interrupt(unsigned long v, struct pt_regs *r)
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{
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__min_ipl = getipl();
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cabriolet_device_interrupt(v, r);
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__min_ipl = 0;
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}
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static void __init
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pc164_init_irq(void)
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{
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common_init_irq(pc164_srm_device_interrupt);
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}
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#endif
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/*
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* The EB66+ is very similar to the EB66 except that it does not have
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* the on-board NCR and Tulip chips. In the code below, I have used
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* slot number to refer to the id select line and *not* the slot
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* number used in the EB66+ documentation. However, in the table,
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* I've given the slot number, the id select line and the Jxx number
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* that's printed on the board. The interrupt pins from the PCI slots
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* are wired into 3 interrupt summary registers at 0x804, 0x805 and
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* 0x806 ISA.
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*
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* In the table, -1 means don't assign an IRQ number. This is usually
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* because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
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*/
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static inline int __init
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eb66p_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+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J25 */
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{16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J26 */
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{ -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
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{16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 9, slot 2, J27 */
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{16+3, 16+3, 16+8, 16+12, 16+6} /* IdSel 10, slot 3, J28 */
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};
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const long min_idsel = 6, max_idsel = 10, 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 AlphaPC64 is very similar to the EB66+ except that its slots
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* are numbered differently. In the code below, I have used slot
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* number to refer to the id select line and *not* the slot number
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* used in the AlphaPC64 documentation. However, in the table, I've
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* given the slot number, the id select line and the Jxx number that's
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* printed on the board. The interrupt pins from the PCI slots are
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* wired into 3 interrupt summary registers at 0x804, 0x805 and 0x806
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* ISA.
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*
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* In the table, -1 means don't assign an IRQ number. This is usually
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* because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
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*/
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static inline int __init
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cabriolet_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+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 5, slot 2, J21 */
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{ 16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J19 */
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{ 16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J20 */
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{ -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
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{ 16+3, 16+3, 16+8, 16+12, 16+16} /* IdSel 9, slot 3, J22 */
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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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static inline void __init
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cabriolet_init_pci(void)
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{
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common_init_pci();
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ns87312_enable_ide(0x398);
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}
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static inline void __init
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cia_cab_init_pci(void)
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{
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cia_init_pci();
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ns87312_enable_ide(0x398);
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}
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/*
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* The PC164 and LX164 have 19 PCI interrupts, four from each of the four
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* PCI slots, the SIO, PCI/IDE, and USB.
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*
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* Each of the interrupts can be individually masked. This is
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* accomplished by setting the appropriate bit in the mask register.
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* A bit is set by writing a "1" to the desired position in the mask
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* register and cleared by writing a "0". There are 3 mask registers
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* located at ISA address 804h, 805h and 806h.
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*
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* An I/O read at ISA address 804h, 805h, 806h will return the
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* state of the 11 PCI interrupts and not the state of the MASKED
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* interrupts.
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*
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* Note: A write to I/O 804h, 805h, and 806h the mask register will be
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* updated.
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*
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*
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* ISA DATA<7:0>
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* ISA +--------------------------------------------------------------+
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* ADDRESS | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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* +==============================================================+
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* 0x804 | INTB0 | USB | IDE | SIO | INTA3 |INTA2 | INTA1 | INTA0 |
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* +--------------------------------------------------------------+
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* 0x805 | INTD0 | INTC3 | INTC2 | INTC1 | INTC0 |INTB3 | INTB2 | INTB1 |
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* +--------------------------------------------------------------+
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* 0x806 | Rsrv | Rsrv | Rsrv | Rsrv | Rsrv |INTD3 | INTD2 | INTD1 |
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* +--------------------------------------------------------------+
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* * Rsrv = reserved bits
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* Note: The mask register is write-only.
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*
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* IdSel
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* 5 32 bit PCI option slot 2
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* 6 64 bit PCI option slot 0
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* 7 64 bit PCI option slot 1
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* 8 Saturn I/O
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* 9 32 bit PCI option slot 3
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* 10 USB
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* 11 IDE
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*
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*/
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static inline int __init
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alphapc164_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
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{
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static char irq_tab[7][5] __initdata = {
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/*INT INTA INTB INTC INTD */
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{ 16+2, 16+2, 16+9, 16+13, 16+17}, /* IdSel 5, slot 2, J20 */
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{ 16+0, 16+0, 16+7, 16+11, 16+15}, /* IdSel 6, slot 0, J29 */
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{ 16+1, 16+1, 16+8, 16+12, 16+16}, /* IdSel 7, slot 1, J26 */
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{ -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
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{ 16+3, 16+3, 16+10, 16+14, 16+18}, /* IdSel 9, slot 3, J19 */
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{ 16+6, 16+6, 16+6, 16+6, 16+6}, /* IdSel 10, USB */
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{ 16+5, 16+5, 16+5, 16+5, 16+5} /* IdSel 11, IDE */
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};
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const long min_idsel = 5, max_idsel = 11, irqs_per_slot = 5;
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return COMMON_TABLE_LOOKUP;
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}
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static inline void __init
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alphapc164_init_pci(void)
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{
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cia_init_pci();
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SMC93x_Init();
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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_CABRIOLET)
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struct alpha_machine_vector cabriolet_mv __initmv = {
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.vector_name = "Cabriolet",
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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 = 35,
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.device_interrupt = cabriolet_device_interrupt,
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.init_arch = apecs_init_arch,
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.init_irq = cabriolet_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = cabriolet_init_pci,
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.pci_map_irq = cabriolet_map_irq,
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.pci_swizzle = common_swizzle,
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};
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#ifndef CONFIG_ALPHA_EB64P
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ALIAS_MV(cabriolet)
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#endif
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#endif
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#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB164)
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struct alpha_machine_vector eb164_mv __initmv = {
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.vector_name = "EB164",
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DO_EV5_MMU,
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DO_DEFAULT_RTC,
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DO_CIA_IO,
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.machine_check = cia_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 = CIA_DEFAULT_MEM_BASE,
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.nr_irqs = 35,
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.device_interrupt = cabriolet_device_interrupt,
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.init_arch = cia_init_arch,
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.init_irq = cabriolet_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = cia_cab_init_pci,
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.kill_arch = cia_kill_arch,
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.pci_map_irq = cabriolet_map_irq,
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.pci_swizzle = common_swizzle,
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};
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ALIAS_MV(eb164)
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#endif
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#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB66P)
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struct alpha_machine_vector eb66p_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 = 35,
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.device_interrupt = cabriolet_device_interrupt,
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.init_arch = lca_init_arch,
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.init_irq = cabriolet_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = cabriolet_init_pci,
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.pci_map_irq = eb66p_map_irq,
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.pci_swizzle = common_swizzle,
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};
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ALIAS_MV(eb66p)
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#endif
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#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_LX164)
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struct alpha_machine_vector lx164_mv __initmv = {
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.vector_name = "LX164",
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DO_EV5_MMU,
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DO_DEFAULT_RTC,
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DO_PYXIS_IO,
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.machine_check = cia_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 = DEFAULT_MEM_BASE,
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.pci_dac_offset = PYXIS_DAC_OFFSET,
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.nr_irqs = 35,
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.device_interrupt = cabriolet_device_interrupt,
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.init_arch = pyxis_init_arch,
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.init_irq = cabriolet_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = alphapc164_init_pci,
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.kill_arch = cia_kill_arch,
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.pci_map_irq = alphapc164_map_irq,
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.pci_swizzle = common_swizzle,
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};
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ALIAS_MV(lx164)
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#endif
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#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
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struct alpha_machine_vector pc164_mv __initmv = {
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.vector_name = "PC164",
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DO_EV5_MMU,
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DO_DEFAULT_RTC,
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DO_CIA_IO,
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.machine_check = cia_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 = CIA_DEFAULT_MEM_BASE,
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.nr_irqs = 35,
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.device_interrupt = pc164_device_interrupt,
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.init_arch = cia_init_arch,
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.init_irq = pc164_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = alphapc164_init_pci,
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.kill_arch = cia_kill_arch,
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.pci_map_irq = alphapc164_map_irq,
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.pci_swizzle = common_swizzle,
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};
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ALIAS_MV(pc164)
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#endif
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