351 lines
8.6 KiB
C
351 lines
8.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/alpha/kernel/sys_wildfire.c
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*
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* Wildfire support.
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*
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* Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <asm/ptrace.h>
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#include <asm/dma.h>
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#include <asm/irq.h>
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#include <asm/mmu_context.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/core_wildfire.h>
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#include <asm/hwrpb.h>
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#include <asm/tlbflush.h>
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#include "proto.h"
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#include "irq_impl.h"
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#include "pci_impl.h"
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#include "machvec_impl.h"
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static unsigned long cached_irq_mask[WILDFIRE_NR_IRQS/(sizeof(long)*8)];
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DEFINE_SPINLOCK(wildfire_irq_lock);
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static int doing_init_irq_hw = 0;
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static void
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wildfire_update_irq_hw(unsigned int irq)
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{
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int qbbno = (irq >> 8) & (WILDFIRE_MAX_QBB - 1);
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int pcano = (irq >> 6) & (WILDFIRE_PCA_PER_QBB - 1);
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wildfire_pca *pca;
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volatile unsigned long * enable0;
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if (!WILDFIRE_PCA_EXISTS(qbbno, pcano)) {
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if (!doing_init_irq_hw) {
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printk(KERN_ERR "wildfire_update_irq_hw:"
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" got irq %d for non-existent PCA %d"
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" on QBB %d.\n",
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irq, pcano, qbbno);
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}
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return;
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}
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pca = WILDFIRE_pca(qbbno, pcano);
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enable0 = (unsigned long *) &pca->pca_int[0].enable; /* ??? */
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*enable0 = cached_irq_mask[qbbno * WILDFIRE_PCA_PER_QBB + pcano];
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mb();
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*enable0;
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}
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static void __init
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wildfire_init_irq_hw(void)
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{
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#if 0
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register wildfire_pca * pca = WILDFIRE_pca(0, 0);
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volatile unsigned long * enable0, * enable1, * enable2, *enable3;
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volatile unsigned long * target0, * target1, * target2, *target3;
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enable0 = (unsigned long *) &pca->pca_int[0].enable;
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enable1 = (unsigned long *) &pca->pca_int[1].enable;
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enable2 = (unsigned long *) &pca->pca_int[2].enable;
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enable3 = (unsigned long *) &pca->pca_int[3].enable;
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target0 = (unsigned long *) &pca->pca_int[0].target;
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target1 = (unsigned long *) &pca->pca_int[1].target;
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target2 = (unsigned long *) &pca->pca_int[2].target;
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target3 = (unsigned long *) &pca->pca_int[3].target;
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*enable0 = *enable1 = *enable2 = *enable3 = 0;
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*target0 = (1UL<<8) | WILDFIRE_QBB(0);
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*target1 = *target2 = *target3 = 0;
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mb();
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*enable0; *enable1; *enable2; *enable3;
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*target0; *target1; *target2; *target3;
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#else
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int i;
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doing_init_irq_hw = 1;
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/* Need to update only once for every possible PCA. */
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for (i = 0; i < WILDFIRE_NR_IRQS; i+=WILDFIRE_IRQ_PER_PCA)
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wildfire_update_irq_hw(i);
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doing_init_irq_hw = 0;
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#endif
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}
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static void
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wildfire_enable_irq(struct irq_data *d)
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{
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unsigned int irq = d->irq;
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if (irq < 16)
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i8259a_enable_irq(d);
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spin_lock(&wildfire_irq_lock);
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set_bit(irq, &cached_irq_mask);
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wildfire_update_irq_hw(irq);
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spin_unlock(&wildfire_irq_lock);
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}
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static void
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wildfire_disable_irq(struct irq_data *d)
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{
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unsigned int irq = d->irq;
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if (irq < 16)
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i8259a_disable_irq(d);
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spin_lock(&wildfire_irq_lock);
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clear_bit(irq, &cached_irq_mask);
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wildfire_update_irq_hw(irq);
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spin_unlock(&wildfire_irq_lock);
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}
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static void
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wildfire_mask_and_ack_irq(struct irq_data *d)
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{
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unsigned int irq = d->irq;
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if (irq < 16)
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i8259a_mask_and_ack_irq(d);
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spin_lock(&wildfire_irq_lock);
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clear_bit(irq, &cached_irq_mask);
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wildfire_update_irq_hw(irq);
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spin_unlock(&wildfire_irq_lock);
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}
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static struct irq_chip wildfire_irq_type = {
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.name = "WILDFIRE",
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.irq_unmask = wildfire_enable_irq,
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.irq_mask = wildfire_disable_irq,
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.irq_mask_ack = wildfire_mask_and_ack_irq,
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};
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static void __init
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wildfire_init_irq_per_pca(int qbbno, int pcano)
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{
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int i, irq_bias;
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static struct irqaction isa_enable = {
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.handler = no_action,
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.name = "isa_enable",
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};
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irq_bias = qbbno * (WILDFIRE_PCA_PER_QBB * WILDFIRE_IRQ_PER_PCA)
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+ pcano * WILDFIRE_IRQ_PER_PCA;
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#if 0
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unsigned long io_bias;
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/* Only need the following for first PCI bus per PCA. */
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io_bias = WILDFIRE_IO(qbbno, pcano<<1) - WILDFIRE_IO_BIAS;
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outb(0, DMA1_RESET_REG + io_bias);
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outb(0, DMA2_RESET_REG + io_bias);
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outb(DMA_MODE_CASCADE, DMA2_MODE_REG + io_bias);
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outb(0, DMA2_MASK_REG + io_bias);
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#endif
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#if 0
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/* ??? Not sure how to do this, yet... */
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init_i8259a_irqs(); /* ??? */
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#endif
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for (i = 0; i < 16; ++i) {
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if (i == 2)
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continue;
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irq_set_chip_and_handler(i + irq_bias, &wildfire_irq_type,
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handle_level_irq);
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irq_set_status_flags(i + irq_bias, IRQ_LEVEL);
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}
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irq_set_chip_and_handler(36 + irq_bias, &wildfire_irq_type,
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handle_level_irq);
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irq_set_status_flags(36 + irq_bias, IRQ_LEVEL);
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for (i = 40; i < 64; ++i) {
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irq_set_chip_and_handler(i + irq_bias, &wildfire_irq_type,
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handle_level_irq);
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irq_set_status_flags(i + irq_bias, IRQ_LEVEL);
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}
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setup_irq(32+irq_bias, &isa_enable);
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}
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static void __init
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wildfire_init_irq(void)
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{
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int qbbno, pcano;
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#if 1
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wildfire_init_irq_hw();
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init_i8259a_irqs();
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#endif
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for (qbbno = 0; qbbno < WILDFIRE_MAX_QBB; qbbno++) {
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if (WILDFIRE_QBB_EXISTS(qbbno)) {
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for (pcano = 0; pcano < WILDFIRE_PCA_PER_QBB; pcano++) {
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if (WILDFIRE_PCA_EXISTS(qbbno, pcano)) {
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wildfire_init_irq_per_pca(qbbno, pcano);
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}
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}
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}
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}
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}
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static void
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wildfire_device_interrupt(unsigned long vector)
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{
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int irq;
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irq = (vector - 0x800) >> 4;
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/*
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* bits 10-8: source QBB ID
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* bits 7-6: PCA
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* bits 5-0: irq in PCA
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*/
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handle_irq(irq);
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return;
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}
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/*
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* PCI Fixup configuration.
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*
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* Summary per PCA (2 PCI or HIPPI buses):
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*
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* Bit Meaning
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* 0-15 ISA
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*
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*32 ISA summary
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*33 SMI
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*34 NMI
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*36 builtin QLogic SCSI (or slot 0 if no IO module)
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*40 Interrupt Line A from slot 2 PCI0
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*41 Interrupt Line B from slot 2 PCI0
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*42 Interrupt Line C from slot 2 PCI0
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*43 Interrupt Line D from slot 2 PCI0
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*44 Interrupt Line A from slot 3 PCI0
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*45 Interrupt Line B from slot 3 PCI0
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*46 Interrupt Line C from slot 3 PCI0
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*47 Interrupt Line D from slot 3 PCI0
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*
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*48 Interrupt Line A from slot 4 PCI1
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*49 Interrupt Line B from slot 4 PCI1
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*50 Interrupt Line C from slot 4 PCI1
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*51 Interrupt Line D from slot 4 PCI1
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*52 Interrupt Line A from slot 5 PCI1
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*53 Interrupt Line B from slot 5 PCI1
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*54 Interrupt Line C from slot 5 PCI1
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*55 Interrupt Line D from slot 5 PCI1
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*56 Interrupt Line A from slot 6 PCI1
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*57 Interrupt Line B from slot 6 PCI1
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*58 Interrupt Line C from slot 6 PCI1
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*50 Interrupt Line D from slot 6 PCI1
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*60 Interrupt Line A from slot 7 PCI1
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*61 Interrupt Line B from slot 7 PCI1
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*62 Interrupt Line C from slot 7 PCI1
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*63 Interrupt Line D from slot 7 PCI1
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*
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*
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* IdSel
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* 0 Cypress Bridge I/O (ISA summary interrupt)
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* 1 64 bit PCI 0 option slot 1 (SCSI QLogic builtin)
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* 2 64 bit PCI 0 option slot 2
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* 3 64 bit PCI 0 option slot 3
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* 4 64 bit PCI 1 option slot 4
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* 5 64 bit PCI 1 option slot 5
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* 6 64 bit PCI 1 option slot 6
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* 7 64 bit PCI 1 option slot 7
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*/
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static int
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wildfire_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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static char irq_tab[8][5] = {
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/*INT INTA INTB INTC INTD */
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{ -1, -1, -1, -1, -1}, /* IdSel 0 ISA Bridge */
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{ 36, 36, 36+1, 36+2, 36+3}, /* IdSel 1 SCSI builtin */
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{ 40, 40, 40+1, 40+2, 40+3}, /* IdSel 2 PCI 0 slot 2 */
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{ 44, 44, 44+1, 44+2, 44+3}, /* IdSel 3 PCI 0 slot 3 */
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{ 48, 48, 48+1, 48+2, 48+3}, /* IdSel 4 PCI 1 slot 4 */
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{ 52, 52, 52+1, 52+2, 52+3}, /* IdSel 5 PCI 1 slot 5 */
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{ 56, 56, 56+1, 56+2, 56+3}, /* IdSel 6 PCI 1 slot 6 */
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{ 60, 60, 60+1, 60+2, 60+3}, /* IdSel 7 PCI 1 slot 7 */
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};
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long min_idsel = 0, max_idsel = 7, irqs_per_slot = 5;
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struct pci_controller *hose = dev->sysdata;
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int irq = COMMON_TABLE_LOOKUP;
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if (irq > 0) {
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int qbbno = hose->index >> 3;
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int pcano = (hose->index >> 1) & 3;
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irq += (qbbno << 8) + (pcano << 6);
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}
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return irq;
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}
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/*
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* The System Vectors
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*/
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struct alpha_machine_vector wildfire_mv __initmv = {
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.vector_name = "WILDFIRE",
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DO_EV6_MMU,
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DO_DEFAULT_RTC,
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DO_WILDFIRE_IO,
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.machine_check = wildfire_machine_check,
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.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
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.min_io_address = DEFAULT_IO_BASE,
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.min_mem_address = DEFAULT_MEM_BASE,
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.nr_irqs = WILDFIRE_NR_IRQS,
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.device_interrupt = wildfire_device_interrupt,
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.init_arch = wildfire_init_arch,
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.init_irq = wildfire_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = common_init_pci,
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.kill_arch = wildfire_kill_arch,
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.pci_map_irq = wildfire_map_irq,
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.pci_swizzle = common_swizzle,
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.pa_to_nid = wildfire_pa_to_nid,
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.cpuid_to_nid = wildfire_cpuid_to_nid,
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.node_mem_start = wildfire_node_mem_start,
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.node_mem_size = wildfire_node_mem_size,
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};
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ALIAS_MV(wildfire)
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