297 lines
8.0 KiB
C
297 lines
8.0 KiB
C
/*
|
|
* 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/system.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/io.h>
|
|
#include <asm/pgtable.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 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(unsigned int irq)
|
|
{
|
|
unsigned long mask;
|
|
mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63)));
|
|
takara_update_irq_hw(irq, mask);
|
|
}
|
|
|
|
static void
|
|
takara_disable_irq(unsigned int irq)
|
|
{
|
|
unsigned long mask;
|
|
mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63));
|
|
takara_update_irq_hw(irq, mask);
|
|
}
|
|
|
|
static unsigned int
|
|
takara_startup_irq(unsigned int irq)
|
|
{
|
|
takara_enable_irq(irq);
|
|
return 0; /* never anything pending */
|
|
}
|
|
|
|
static void
|
|
takara_end_irq(unsigned int irq)
|
|
{
|
|
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
|
|
takara_enable_irq(irq);
|
|
}
|
|
|
|
static struct hw_interrupt_type takara_irq_type = {
|
|
.typename = "TAKARA",
|
|
.startup = takara_startup_irq,
|
|
.shutdown = takara_disable_irq,
|
|
.enable = takara_enable_irq,
|
|
.disable = takara_disable_irq,
|
|
.ack = takara_disable_irq,
|
|
.end = takara_end_irq,
|
|
};
|
|
|
|
static void
|
|
takara_device_interrupt(unsigned long vector, struct pt_regs *regs)
|
|
{
|
|
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, regs);
|
|
if (intstatus & 4) handle_irq(16+2, regs);
|
|
if (intstatus & 2) handle_irq(16+1, regs);
|
|
if (intstatus & 1) handle_irq(16+0, regs);
|
|
} else {
|
|
isa_device_interrupt (vector, regs);
|
|
}
|
|
}
|
|
|
|
static void
|
|
takara_srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
|
|
{
|
|
int irq = (vector - 0x800) >> 4;
|
|
handle_irq(irq, regs);
|
|
}
|
|
|
|
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_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
|
|
irq_desc[i].chip = &takara_irq_type;
|
|
}
|
|
|
|
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 __init
|
|
takara_map_irq_srm(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 */
|
|
/* 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(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 __init
|
|
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();
|
|
ns87312_enable_ide(0x26e);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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)
|