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kernel-ark/arch/alpha/kernel/sys_takara.c
Thomas Gleixner 44377f622e alpha: remove obsolete hw_interrupt_type 
The defines and typedefs (hw_interrupt_type, no_irq_type, irq_desc_t) have
been kept around for migration reasons.  After more than two years it's
time to remove them finally.

This patch cleans up one of the remaining users.  When all such patches
hit mainline we can remove the defines and typedefs finally.

Impact: cleanup

Convert the last remaining users to struct irq_chip and remove the
define.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Henderson <rth@twiddle.net>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16 19:47:46 -07:00

297 lines
7.9 KiB
C
Raw Blame History

/*
* 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 irq_chip 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)
{
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_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)
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