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linux-sg2042/arch/alpha/kernel/sys_takara.c

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// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/alpha/kernel/sys_takara.c
*
* Copyright (C) 1995 David A Rusling
* Copyright (C) 1996 Jay A Estabrook
* Copyright (C) 1998, 1999 Richard Henderson
*
* Code supporting the TAKARA.
*/
#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/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"
#include "pc873xx.h"
/* Note mask bit is true for DISABLED irqs. */
static unsigned long cached_irq_mask[2] = { -1, -1 };
static inline void
takara_update_irq_hw(unsigned long irq, unsigned long mask)
{
int regaddr;
mask = (irq >= 64 ? mask << 16 : mask >> ((irq - 16) & 0x30));
regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c);
outl(mask & 0xffff0000UL, regaddr);
}
static inline void
takara_enable_irq(struct irq_data *d)
{
unsigned int irq = d->irq;
unsigned long mask;
mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63)));
takara_update_irq_hw(irq, mask);
}
static void
takara_disable_irq(struct irq_data *d)
{
unsigned int irq = d->irq;
unsigned long mask;
mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63));
takara_update_irq_hw(irq, mask);
}
static struct irq_chip takara_irq_type = {
.name = "TAKARA",
.irq_unmask = takara_enable_irq,
.irq_mask = takara_disable_irq,
.irq_mask_ack = takara_disable_irq,
};
static void
takara_device_interrupt(unsigned long vector)
{
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);
if (intstatus & 4) handle_irq(16+2);
if (intstatus & 2) handle_irq(16+1);
if (intstatus & 1) handle_irq(16+0);
} else {
isa_device_interrupt (vector);
}
}
static void
takara_srm_device_interrupt(unsigned long vector)
{
int irq = (vector - 0x800) >> 4;
handle_irq(irq);
}
static void __init
takara_init_irq(void)
{
long i;
init_i8259a_irqs();
if (alpha_using_srm) {
alpha_mv.device_interrupt = takara_srm_device_interrupt;
} else {
unsigned int ctlreg = inl(0x500);
/* Return to non-accelerated mode. */
ctlreg &= ~0x8000;
outl(ctlreg, 0x500);
/* Enable the PCI interrupt register. */
ctlreg = 0x05107c00;
outl(ctlreg, 0x500);
}
for (i = 16; i < 128; i += 16)
takara_update_irq_hw(i, -1);
for (i = 16; i < 128; ++i) {
irq_set_chip_and_handler(i, &takara_irq_type,
handle_level_irq);
irq_set_status_flags(i, IRQ_LEVEL);
}
common_init_isa_dma();
}
/*
* The Takara has PCI devices 1, 2, and 3 configured to slots 20,
* 19, and 18 respectively, in the default configuration. They can
* also be jumpered to slots 8, 7, and 6 respectively, which is fun
* because the SIO ISA bridge can also be slot 7. However, the SIO
* doesn't explicitly generate PCI-type interrupts, so we can
* assign it whatever the hell IRQ we like and it doesn't matter.
*/
static int
takara_map_irq_srm(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[15][5] = {
{ 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */
{ 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */
{ 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */
{ -1, -1, -1, -1, -1}, /* slot 9 == nothing */
{ -1, -1, -1, -1, -1}, /* slot 10 == nothing */
{ -1, -1, -1, -1, -1}, /* slot 11 == nothing */
/* These are behind the bridges. */
{ 12, 12, 13, 14, 15}, /* slot 12 == nothing */
{ 8, 8, 9, 19, 11}, /* slot 13 == nothing */
{ 4, 4, 5, 6, 7}, /* slot 14 == nothing */
{ 0, 0, 1, 2, 3}, /* slot 15 == nothing */
{ -1, -1, -1, -1, -1}, /* slot 16 == nothing */
{64+ 0, 64+0, 64+1, 64+2, 64+3}, /* slot 17= device 4 */
{48+ 0, 48+0, 48+1, 48+2, 48+3}, /* slot 18= device 3 */
{32+ 0, 32+0, 32+1, 32+2, 32+3}, /* slot 19= device 2 */
{16+ 0, 16+0, 16+1, 16+2, 16+3}, /* slot 20= device 1 */
};
const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
int irq = COMMON_TABLE_LOOKUP;
if (irq >= 0 && irq < 16) {
/* Guess that we are behind a bridge. */
unsigned int busslot = PCI_SLOT(dev->bus->self->devfn);
irq += irq_tab[busslot-min_idsel][0];
}
return irq;
}
static int __init
takara_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[15][5] __initdata = {
{ 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */
{ 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */
{ 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */
{ -1, -1, -1, -1, -1}, /* slot 9 == nothing */
{ -1, -1, -1, -1, -1}, /* slot 10 == nothing */
{ -1, -1, -1, -1, -1}, /* slot 11 == nothing */
{ -1, -1, -1, -1, -1}, /* slot 12 == nothing */
{ -1, -1, -1, -1, -1}, /* slot 13 == nothing */
{ -1, -1, -1, -1, -1}, /* slot 14 == nothing */
{ -1, -1, -1, -1, -1}, /* slot 15 == nothing */
{ -1, -1, -1, -1, -1}, /* slot 16 == nothing */
{ -1, -1, -1, -1, -1}, /* slot 17 == nothing */
{ 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 18 == device 3 */
{ 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 19 == device 2 */
{ 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 20 == device 1 */
};
const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
return COMMON_TABLE_LOOKUP;
}
static u8
takara_swizzle(struct pci_dev *dev, u8 *pinp)
{
int slot = PCI_SLOT(dev->devfn);
int pin = *pinp;
unsigned int ctlreg = inl(0x500);
unsigned int busslot;
if (!dev->bus->self)
return slot;
busslot = PCI_SLOT(dev->bus->self->devfn);
/* Check for built-in bridges. */
if (dev->bus->number != 0
&& busslot > 16
&& ((1<<(36-busslot)) & ctlreg)) {
if (pin == 1)
pin += (20 - busslot);
else {
printk(KERN_WARNING "takara_swizzle: can only "
"handle cards with INTA IRQ pin.\n");
}
} else {
/* Must be a card-based bridge. */
printk(KERN_WARNING "takara_swizzle: cannot handle "
"card-bridge behind builtin bridge yet.\n");
}
*pinp = pin;
return slot;
}
static void __init
takara_init_pci(void)
{
if (alpha_using_srm)
alpha_mv.pci_map_irq = takara_map_irq_srm;
cia_init_pci();
if (pc873xx_probe() == -1) {
printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n");
} else {
printk(KERN_INFO "Found %s Super IO chip at 0x%x\n",
pc873xx_get_model(), pc873xx_get_base());
pc873xx_enable_ide();
}
}
/*
* The System Vector
*/
struct alpha_machine_vector takara_mv __initmv = {
.vector_name = "Takara",
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 = DEFAULT_IO_BASE,
.min_mem_address = CIA_DEFAULT_MEM_BASE,
.nr_irqs = 128,
.device_interrupt = takara_device_interrupt,
.init_arch = cia_init_arch,
.init_irq = takara_init_irq,
.init_rtc = common_init_rtc,
.init_pci = takara_init_pci,
.kill_arch = cia_kill_arch,
.pci_map_irq = takara_map_irq,
.pci_swizzle = takara_swizzle,
};
ALIAS_MV(takara)
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