// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/alpha/kernel/sys_noritake.c
*
* Copyright (C) 1995 David A Rusling
* Copyright (C) 1996 Jay A Estabrook
* Copyright (C) 1998, 1999 Richard Henderson
*
* Code supporting the NORITAKE (AlphaServer 1000A),
* CORELLE (AlphaServer 800), and ALCOR Primo (AlphaStation 600A).
*/
#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 <linux/bitops.h>
#include <asm/ptrace.h>
#include <asm/mce.h>
#include <asm/dma.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/core_cia.h>
#include <asm/tlbflush.h>
#include "proto.h"
#include "irq_impl.h"
#include "pci_impl.h"
#include "machvec_impl.h"
/* Note mask bit is true for ENABLED irqs. */
static int cached_irq_mask;
static inline void
noritake_update_irq_hw(int irq, int mask)
{
int port = 0x54a;
if (irq >= 32) {
mask >>= 16;
port = 0x54c;
}
outw(mask, port);
}
static void
noritake_enable_irq(struct irq_data *d)
{
noritake_update_irq_hw(d->irq, cached_irq_mask |= 1 << (d->irq - 16));
}
static void
noritake_disable_irq(struct irq_data *d)
{
noritake_update_irq_hw(d->irq, cached_irq_mask &= ~(1 << (d->irq - 16)));
}
static struct irq_chip noritake_irq_type = {
.name = "NORITAKE",
.irq_unmask = noritake_enable_irq,
.irq_mask = noritake_disable_irq,
.irq_mask_ack = noritake_disable_irq,
};
static void
noritake_device_interrupt(unsigned long vector)
{
unsigned long pld;
unsigned int i;
/* Read the interrupt summary registers of NORITAKE */
pld = (((unsigned long) inw(0x54c) << 32)
| ((unsigned long) inw(0x54a) << 16)
| ((unsigned long) inb(0xa0) << 8)
| 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);
} else {
handle_irq(i);
}
}
}
static void
noritake_srm_device_interrupt(unsigned long vector)
{
int irq;
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)
irq = irq + 1;
handle_irq(irq);
}
static void __init
noritake_init_irq(void)
{
long i;
if (alpha_using_srm)
alpha_mv.device_interrupt = noritake_srm_device_interrupt;
outw(0, 0x54a);
outw(0, 0x54c);
for (i = 16; i < 48; ++i) {
irq_set_chip_and_handler(i, &noritake_irq_type,
handle_level_irq);
irq_set_status_flags(i, IRQ_LEVEL);
}
init_i8259a_irqs();
common_init_isa_dma();
}
/*
* 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
noritake_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[15][5] = {
/*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 u8
noritake_swizzle(struct pci_dev *dev, u8 *pinp)
{
int slot, pin = *pinp;
if (dev->bus->number == 0) {
slot = PCI_SLOT(dev->devfn);
}
/* Check for the built-in bridge */
else 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 = pci_swizzle_interrupt_pin(dev, pin);
/* 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;
}
struct alpha_machine_vector noritake_primo_mv __initmv = {
.vector_name = "Noritake-Primo",
DO_EV5_MMU,
DO_DEFAULT_RTC,
DO_CIA_IO,
.machine_check = cia_machine_check,
.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
.min_io_address = EISA_DEFAULT_IO_BASE,
.min_mem_address = CIA_DEFAULT_MEM_BASE,
.nr_irqs = 48,
.device_interrupt = noritake_device_interrupt,
.init_arch = cia_init_arch,
.init_irq = noritake_init_irq,
.init_rtc = common_init_rtc,
.init_pci = cia_init_pci,
.kill_arch = cia_kill_arch,
.pci_map_irq = noritake_map_irq,
.pci_swizzle = noritake_swizzle,
};
ALIAS_MV(noritake_primo)
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