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/*
* linux/arch/alpha/kernel/sys_sx164.c
*
* Copyright (C) 1995 David A Rusling
* Copyright (C) 1996 Jay A Estabrook
* Copyright (C) 1998 Richard Henderson
*
* Code supporting the SX164 (PCA56+PYXIS).
*/
#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/bitops.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/core_pyxis.h>
#include "proto.h"
#include "irq.h"
#include "bios32.h"
#include "machvec.h"
static void
sx164_update_irq_hw(unsigned long irq, unsigned long mask, int unmask_p)
{
if (irq >= 16) {
/* Make CERTAIN none of the bogus ints get enabled */
*(vulp)PYXIS_INT_MASK =
~((long)mask >> 16) & ~0x000000000000003bUL;
mb();
/* ... and read it back to make sure it got written. */
*(vulp)PYXIS_INT_MASK;
}
else if (irq >= 8)
outb(mask >> 8, 0xA1); /* ISA PIC2 */
else
outb(mask, 0x21); /* ISA PIC1 */
}
static void
sx164_srm_update_irq_hw(unsigned long irq, unsigned long mask, int unmask_p)
{
if (irq >= 16) {
if (unmask_p)
cserve_ena(irq - 16);
else
cserve_dis(irq - 16);
}
else if (irq >= 8)
outb(mask >> 8, 0xA1); /* ISA PIC2 */
else
outb(mask, 0x21); /* ISA PIC1 */
}
static void
sx164_device_interrupt(unsigned long vector, struct pt_regs *regs)
{
unsigned long pld, tmp;
unsigned int i;
/* Read the interrupt summary register of PYXIS */
pld = *(vulp)PYXIS_INT_REQ;
/*
* For now, AND off any bits we are not interested in:
* HALT (2), timer (6), ISA Bridge (7)
* then all the PCI slots/INTXs (8-23)
*/
/* Maybe HALT should only be used for SRM console boots? */
pld &= 0x0000000000ffffc0UL;
/*
* 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 == 7) {
isa_device_interrupt(vector, regs);
} else if (i == 6) {
continue;
} else {
/* if not timer int */
handle_irq(16 + i, 16 + i, regs);
}
*(vulp)PYXIS_INT_REQ = 1UL << i; mb();
tmp = *(vulp)PYXIS_INT_REQ;
}
}
static void
sx164_init_irq(void)
{
outb(0, DMA1_RESET_REG);
outb(0, DMA2_RESET_REG);
outb(DMA_MODE_CASCADE, DMA2_MODE_REG);
outb(0, DMA2_MASK_REG);
if (alpha_using_srm) {
alpha_mv.update_irq_hw = sx164_srm_update_irq_hw;
alpha_mv.device_interrupt = srm_device_interrupt;
}
else {
/* Note invert on MASK bits. */
*(vulp)PYXIS_INT_MASK = ~((long)alpha_irq_mask >> 16);
mb();
*(vulp)PYXIS_INT_MASK;
}
enable_irq(16 + 6); /* enable timer */
enable_irq(16 + 7); /* enable ISA PIC cascade */
enable_irq(2); /* enable cascade */
}
/*
* PCI Fixup configuration.
*
* Summary @ PYXIS_INT_REQ:
* Bit Meaning
* 0 RSVD
* 1 NMI
* 2 Halt/Reset switch
* 3 MBZ
* 4 RAZ
* 5 RAZ
* 6 Interval timer (RTC)
* 7 PCI-ISA Bridge
* 8 Interrupt Line A from slot 3
* 9 Interrupt Line A from slot 2
*10 Interrupt Line A from slot 1
*11 Interrupt Line A from slot 0
*12 Interrupt Line B from slot 3
*13 Interrupt Line B from slot 2
*14 Interrupt Line B from slot 1
*15 Interrupt line B from slot 0
*16 Interrupt Line C from slot 3
*17 Interrupt Line C from slot 2
*18 Interrupt Line C from slot 1
*19 Interrupt Line C from slot 0
*20 Interrupt Line D from slot 3
*21 Interrupt Line D from slot 2
*22 Interrupt Line D from slot 1
*23 Interrupt Line D from slot 0
*
* IdSel
* 5 32 bit PCI option slot 2
* 6 64 bit PCI option slot 0
* 7 64 bit PCI option slot 1
* 8 Cypress I/O
* 9 32 bit PCI option slot 3
*
*/
static int __init
sx164_map_irq(struct pci_dev *dev, int slot, int pin)
{
static char irq_tab[5][5] __initlocaldata = {
/*INT INTA INTB INTC INTD */
{ 16+ 9, 16+ 9, 16+13, 16+17, 16+21}, /* IdSel 5 slot 2 J17 */
{ 16+11, 16+11, 16+15, 16+19, 16+23}, /* IdSel 6 slot 0 J19 */
{ 16+10, 16+10, 16+14, 16+18, 16+22}, /* IdSel 7 slot 1 J18 */
{ -1, -1, -1, -1, -1}, /* IdSel 8 SIO */
{ 16+ 8, 16+ 8, 16+12, 16+16, 16+20} /* IdSel 9 slot 3 J15 */
};
const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
return COMMON_TABLE_LOOKUP;
}
void __init
sx164_pci_fixup(void)
{
layout_all_busses(DEFAULT_IO_BASE, DEFAULT_MEM_BASE);
common_pci_fixup(sx164_map_irq, common_swizzle);
SMC669_Init();
}
/*
* The System Vector
*/
struct alpha_machine_vector sx164_mv __initmv = {
vector_name: "SX164",
DO_EV5_MMU,
DO_DEFAULT_RTC,
DO_PYXIS_IO,
DO_PYXIS_BUS,
machine_check: pyxis_machine_check,
max_dma_address: ALPHA_MAX_DMA_ADDRESS,
nr_irqs: 40,
irq_probe_mask: _PROBE_MASK(40),
update_irq_hw: sx164_update_irq_hw,
ack_irq: generic_ack_irq,
device_interrupt: sx164_device_interrupt,
init_arch: pyxis_init_arch,
init_irq: sx164_init_irq,
init_pit: generic_init_pit,
pci_fixup: sx164_pci_fixup,
kill_arch: generic_kill_arch,
};
ALIAS_MV(sx164)
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