327 lines
7.9 KiB
C
327 lines
7.9 KiB
C
/*
|
|
* linux/arch/alpha/kernel/sys_alcor.c
|
|
*
|
|
* Copyright (C) 1995 David A Rusling
|
|
* Copyright (C) 1996 Jay A Estabrook
|
|
* Copyright (C) 1998, 1999 Richard Henderson
|
|
*
|
|
* Code supporting the ALCOR and XLT (XL-300/366/433).
|
|
*/
|
|
|
|
#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/reboot.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <asm/system.h>
|
|
#include <asm/io.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/irq.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 ENABLED irqs. */
|
|
static unsigned long cached_irq_mask;
|
|
|
|
static inline void
|
|
alcor_update_irq_hw(unsigned long mask)
|
|
{
|
|
*(vuip)GRU_INT_MASK = mask;
|
|
mb();
|
|
}
|
|
|
|
static inline void
|
|
alcor_enable_irq(unsigned int irq)
|
|
{
|
|
alcor_update_irq_hw(cached_irq_mask |= 1UL << (irq - 16));
|
|
}
|
|
|
|
static void
|
|
alcor_disable_irq(unsigned int irq)
|
|
{
|
|
alcor_update_irq_hw(cached_irq_mask &= ~(1UL << (irq - 16)));
|
|
}
|
|
|
|
static void
|
|
alcor_mask_and_ack_irq(unsigned int irq)
|
|
{
|
|
alcor_disable_irq(irq);
|
|
|
|
/* On ALCOR/XLT, need to dismiss interrupt via GRU. */
|
|
*(vuip)GRU_INT_CLEAR = 1 << (irq - 16); mb();
|
|
*(vuip)GRU_INT_CLEAR = 0; mb();
|
|
}
|
|
|
|
static unsigned int
|
|
alcor_startup_irq(unsigned int irq)
|
|
{
|
|
alcor_enable_irq(irq);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
alcor_isa_mask_and_ack_irq(unsigned int irq)
|
|
{
|
|
i8259a_mask_and_ack_irq(irq);
|
|
|
|
/* On ALCOR/XLT, need to dismiss interrupt via GRU. */
|
|
*(vuip)GRU_INT_CLEAR = 0x80000000; mb();
|
|
*(vuip)GRU_INT_CLEAR = 0; mb();
|
|
}
|
|
|
|
static void
|
|
alcor_end_irq(unsigned int irq)
|
|
{
|
|
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
|
|
alcor_enable_irq(irq);
|
|
}
|
|
|
|
static struct hw_interrupt_type alcor_irq_type = {
|
|
.typename = "ALCOR",
|
|
.startup = alcor_startup_irq,
|
|
.shutdown = alcor_disable_irq,
|
|
.enable = alcor_enable_irq,
|
|
.disable = alcor_disable_irq,
|
|
.ack = alcor_mask_and_ack_irq,
|
|
.end = alcor_end_irq,
|
|
};
|
|
|
|
static void
|
|
alcor_device_interrupt(unsigned long vector, struct pt_regs *regs)
|
|
{
|
|
unsigned long pld;
|
|
unsigned int i;
|
|
|
|
/* Read the interrupt summary register of the GRU */
|
|
pld = (*(vuip)GRU_INT_REQ) & GRU_INT_REQ_BITS;
|
|
|
|
/*
|
|
* 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 == 31) {
|
|
isa_device_interrupt(vector, regs);
|
|
} else {
|
|
handle_irq(16 + i, regs);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void __init
|
|
alcor_init_irq(void)
|
|
{
|
|
long i;
|
|
|
|
if (alpha_using_srm)
|
|
alpha_mv.device_interrupt = srm_device_interrupt;
|
|
|
|
*(vuip)GRU_INT_MASK = 0; mb(); /* all disabled */
|
|
*(vuip)GRU_INT_EDGE = 0; mb(); /* all are level */
|
|
*(vuip)GRU_INT_HILO = 0x80000000U; mb(); /* ISA only HI */
|
|
*(vuip)GRU_INT_CLEAR = 0; mb(); /* all clear */
|
|
|
|
for (i = 16; i < 48; ++i) {
|
|
/* On Alcor, at least, lines 20..30 are not connected
|
|
and can generate spurrious interrupts if we turn them
|
|
on while IRQ probing. */
|
|
if (i >= 16+20 && i <= 16+30)
|
|
continue;
|
|
irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
|
|
irq_desc[i].chip = &alcor_irq_type;
|
|
}
|
|
i8259a_irq_type.ack = alcor_isa_mask_and_ack_irq;
|
|
|
|
init_i8259a_irqs();
|
|
common_init_isa_dma();
|
|
|
|
setup_irq(16+31, &isa_cascade_irqaction);
|
|
}
|
|
|
|
|
|
/*
|
|
* PCI Fixup configuration.
|
|
*
|
|
* Summary @ GRU_INT_REQ:
|
|
* Bit Meaning
|
|
* 0 Interrupt Line A from slot 2
|
|
* 1 Interrupt Line B from slot 2
|
|
* 2 Interrupt Line C from slot 2
|
|
* 3 Interrupt Line D from slot 2
|
|
* 4 Interrupt Line A from slot 1
|
|
* 5 Interrupt line B from slot 1
|
|
* 6 Interrupt Line C from slot 1
|
|
* 7 Interrupt Line D from slot 1
|
|
* 8 Interrupt Line A from slot 0
|
|
* 9 Interrupt Line B from slot 0
|
|
*10 Interrupt Line C from slot 0
|
|
*11 Interrupt Line D from slot 0
|
|
*12 Interrupt Line A from slot 4
|
|
*13 Interrupt Line B from slot 4
|
|
*14 Interrupt Line C from slot 4
|
|
*15 Interrupt Line D from slot 4
|
|
*16 Interrupt Line D from slot 3
|
|
*17 Interrupt Line D from slot 3
|
|
*18 Interrupt Line D from slot 3
|
|
*19 Interrupt Line D from slot 3
|
|
*20-30 Reserved
|
|
*31 EISA interrupt
|
|
*
|
|
* The device to slot mapping looks like:
|
|
*
|
|
* Slot Device
|
|
* 6 built-in TULIP (XLT only)
|
|
* 7 PCI on board slot 0
|
|
* 8 PCI on board slot 3
|
|
* 9 PCI on board slot 4
|
|
* 10 PCEB (PCI-EISA bridge)
|
|
* 11 PCI on board slot 2
|
|
* 12 PCI on board slot 1
|
|
*
|
|
*
|
|
* 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 __init
|
|
alcor_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
|
|
{
|
|
static char irq_tab[7][5] __initdata = {
|
|
/*INT INTA INTB INTC INTD */
|
|
/* note: IDSEL 17 is XLT only */
|
|
{16+13, 16+13, 16+13, 16+13, 16+13}, /* IdSel 17, TULIP */
|
|
{ 16+8, 16+8, 16+9, 16+10, 16+11}, /* IdSel 18, slot 0 */
|
|
{16+16, 16+16, 16+17, 16+18, 16+19}, /* IdSel 19, slot 3 */
|
|
{16+12, 16+12, 16+13, 16+14, 16+15}, /* IdSel 20, slot 4 */
|
|
{ -1, -1, -1, -1, -1}, /* IdSel 21, PCEB */
|
|
{ 16+0, 16+0, 16+1, 16+2, 16+3}, /* IdSel 22, slot 2 */
|
|
{ 16+4, 16+4, 16+5, 16+6, 16+7}, /* IdSel 23, slot 1 */
|
|
};
|
|
const long min_idsel = 6, max_idsel = 12, irqs_per_slot = 5;
|
|
return COMMON_TABLE_LOOKUP;
|
|
}
|
|
|
|
static void
|
|
alcor_kill_arch(int mode)
|
|
{
|
|
cia_kill_arch(mode);
|
|
|
|
#ifndef ALPHA_RESTORE_SRM_SETUP
|
|
switch(mode) {
|
|
case LINUX_REBOOT_CMD_RESTART:
|
|
/* Who said DEC engineer's have no sense of humor? ;-) */
|
|
if (alpha_using_srm) {
|
|
*(vuip) GRU_RESET = 0x0000dead;
|
|
mb();
|
|
}
|
|
break;
|
|
case LINUX_REBOOT_CMD_HALT:
|
|
break;
|
|
case LINUX_REBOOT_CMD_POWER_OFF:
|
|
break;
|
|
}
|
|
|
|
halt();
|
|
#endif
|
|
}
|
|
|
|
static void __init
|
|
alcor_init_pci(void)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
cia_init_pci();
|
|
|
|
/*
|
|
* Now we can look to see if we are really running on an XLT-type
|
|
* motherboard, by looking for a 21040 TULIP in slot 6, which is
|
|
* built into XLT and BRET/MAVERICK, but not available on ALCOR.
|
|
*/
|
|
dev = pci_get_device(PCI_VENDOR_ID_DEC,
|
|
PCI_DEVICE_ID_DEC_TULIP,
|
|
NULL);
|
|
if (dev && dev->devfn == PCI_DEVFN(6,0)) {
|
|
alpha_mv.sys.cia.gru_int_req_bits = XLT_GRU_INT_REQ_BITS;
|
|
printk(KERN_INFO "%s: Detected AS500 or XLT motherboard.\n",
|
|
__FUNCTION__);
|
|
}
|
|
pci_dev_put(dev);
|
|
}
|
|
|
|
|
|
/*
|
|
* The System Vectors
|
|
*/
|
|
|
|
struct alpha_machine_vector alcor_mv __initmv = {
|
|
.vector_name = "Alcor",
|
|
DO_EV5_MMU,
|
|
DO_DEFAULT_RTC,
|
|
DO_CIA_IO,
|
|
.machine_check = cia_machine_check,
|
|
.max_isa_dma_address = ALPHA_ALCOR_MAX_ISA_DMA_ADDRESS,
|
|
.min_io_address = EISA_DEFAULT_IO_BASE,
|
|
.min_mem_address = CIA_DEFAULT_MEM_BASE,
|
|
|
|
.nr_irqs = 48,
|
|
.device_interrupt = alcor_device_interrupt,
|
|
|
|
.init_arch = cia_init_arch,
|
|
.init_irq = alcor_init_irq,
|
|
.init_rtc = common_init_rtc,
|
|
.init_pci = alcor_init_pci,
|
|
.kill_arch = alcor_kill_arch,
|
|
.pci_map_irq = alcor_map_irq,
|
|
.pci_swizzle = common_swizzle,
|
|
|
|
.sys = { .cia = {
|
|
.gru_int_req_bits = ALCOR_GRU_INT_REQ_BITS
|
|
}}
|
|
};
|
|
ALIAS_MV(alcor)
|
|
|
|
struct alpha_machine_vector xlt_mv __initmv = {
|
|
.vector_name = "XLT",
|
|
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 = alcor_device_interrupt,
|
|
|
|
.init_arch = cia_init_arch,
|
|
.init_irq = alcor_init_irq,
|
|
.init_rtc = common_init_rtc,
|
|
.init_pci = alcor_init_pci,
|
|
.kill_arch = alcor_kill_arch,
|
|
.pci_map_irq = alcor_map_irq,
|
|
.pci_swizzle = common_swizzle,
|
|
|
|
.sys = { .cia = {
|
|
.gru_int_req_bits = XLT_GRU_INT_REQ_BITS
|
|
}}
|
|
};
|
|
|
|
/* No alpha_mv alias for XLT, since we compile it in unconditionally
|
|
with ALCOR; setup_arch knows how to cope. */
|