471 lines
11 KiB
C
471 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/alpha/kernel/sys_marvel.c
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*
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* Marvel / IO7 support
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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/core_marvel.h>
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#include <asm/hwrpb.h>
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#include <asm/tlbflush.h>
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#include <asm/vga.h>
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#include "proto.h"
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#include "err_impl.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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#if NR_IRQS < MARVEL_NR_IRQS
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# error NR_IRQS < MARVEL_NR_IRQS !!!
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#endif
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/*
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* Interrupt handling.
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*/
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static void
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io7_device_interrupt(unsigned long vector)
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{
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unsigned int pid;
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unsigned int irq;
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/*
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* Vector is 0x800 + (interrupt)
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*
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* where (interrupt) is:
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*
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* ...16|15 14|13 4|3 0
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* -----+-----+--------+---
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* PE | 0 | irq | 0
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*
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* where (irq) is
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*
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* 0x0800 - 0x0ff0 - 0x0800 + (LSI id << 4)
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* 0x1000 - 0x2ff0 - 0x1000 + (MSI_DAT<8:0> << 4)
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*/
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pid = vector >> 16;
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irq = ((vector & 0xffff) - 0x800) >> 4;
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irq += 16; /* offset for legacy */
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irq &= MARVEL_IRQ_VEC_IRQ_MASK; /* not too many bits */
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irq |= pid << MARVEL_IRQ_VEC_PE_SHIFT; /* merge the pid */
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handle_irq(irq);
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}
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static volatile unsigned long *
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io7_get_irq_ctl(unsigned int irq, struct io7 **pio7)
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{
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volatile unsigned long *ctl;
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unsigned int pid;
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struct io7 *io7;
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pid = irq >> MARVEL_IRQ_VEC_PE_SHIFT;
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if (!(io7 = marvel_find_io7(pid))) {
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printk(KERN_ERR
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"%s for nonexistent io7 -- vec %x, pid %d\n",
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__func__, irq, pid);
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return NULL;
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}
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irq &= MARVEL_IRQ_VEC_IRQ_MASK; /* isolate the vector */
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irq -= 16; /* subtract legacy bias */
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if (irq >= 0x180) {
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printk(KERN_ERR
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"%s for invalid irq -- pid %d adjusted irq %x\n",
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__func__, pid, irq);
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return NULL;
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}
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ctl = &io7->csrs->PO7_LSI_CTL[irq & 0xff].csr; /* assume LSI */
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if (irq >= 0x80) /* MSI */
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ctl = &io7->csrs->PO7_MSI_CTL[((irq - 0x80) >> 5) & 0x0f].csr;
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if (pio7) *pio7 = io7;
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return ctl;
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}
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static void
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io7_enable_irq(struct irq_data *d)
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{
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volatile unsigned long *ctl;
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unsigned int irq = d->irq;
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struct io7 *io7;
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ctl = io7_get_irq_ctl(irq, &io7);
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if (!ctl || !io7) {
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printk(KERN_ERR "%s: get_ctl failed for irq %x\n",
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__func__, irq);
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return;
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}
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raw_spin_lock(&io7->irq_lock);
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*ctl |= 1UL << 24;
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mb();
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*ctl;
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raw_spin_unlock(&io7->irq_lock);
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}
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static void
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io7_disable_irq(struct irq_data *d)
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{
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volatile unsigned long *ctl;
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unsigned int irq = d->irq;
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struct io7 *io7;
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ctl = io7_get_irq_ctl(irq, &io7);
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if (!ctl || !io7) {
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printk(KERN_ERR "%s: get_ctl failed for irq %x\n",
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__func__, irq);
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return;
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}
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raw_spin_lock(&io7->irq_lock);
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*ctl &= ~(1UL << 24);
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mb();
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*ctl;
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raw_spin_unlock(&io7->irq_lock);
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}
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static void
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marvel_irq_noop(struct irq_data *d)
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{
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return;
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}
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static struct irq_chip marvel_legacy_irq_type = {
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.name = "LEGACY",
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.irq_mask = marvel_irq_noop,
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.irq_unmask = marvel_irq_noop,
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};
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static struct irq_chip io7_lsi_irq_type = {
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.name = "LSI",
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.irq_unmask = io7_enable_irq,
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.irq_mask = io7_disable_irq,
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.irq_mask_ack = io7_disable_irq,
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};
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static struct irq_chip io7_msi_irq_type = {
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.name = "MSI",
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.irq_unmask = io7_enable_irq,
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.irq_mask = io7_disable_irq,
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.irq_ack = marvel_irq_noop,
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};
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static void
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io7_redirect_irq(struct io7 *io7,
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volatile unsigned long *csr,
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unsigned int where)
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{
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unsigned long val;
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val = *csr;
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val &= ~(0x1ffUL << 24); /* clear the target pid */
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val |= ((unsigned long)where << 24); /* set the new target pid */
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*csr = val;
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mb();
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*csr;
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}
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static void
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io7_redirect_one_lsi(struct io7 *io7, unsigned int which, unsigned int where)
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{
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unsigned long val;
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/*
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* LSI_CTL has target PID @ 14
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*/
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val = io7->csrs->PO7_LSI_CTL[which].csr;
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val &= ~(0x1ffUL << 14); /* clear the target pid */
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val |= ((unsigned long)where << 14); /* set the new target pid */
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io7->csrs->PO7_LSI_CTL[which].csr = val;
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mb();
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io7->csrs->PO7_LSI_CTL[which].csr;
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}
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static void
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io7_redirect_one_msi(struct io7 *io7, unsigned int which, unsigned int where)
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{
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unsigned long val;
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/*
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* MSI_CTL has target PID @ 14
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*/
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val = io7->csrs->PO7_MSI_CTL[which].csr;
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val &= ~(0x1ffUL << 14); /* clear the target pid */
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val |= ((unsigned long)where << 14); /* set the new target pid */
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io7->csrs->PO7_MSI_CTL[which].csr = val;
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mb();
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io7->csrs->PO7_MSI_CTL[which].csr;
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}
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static void __init
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init_one_io7_lsi(struct io7 *io7, unsigned int which, unsigned int where)
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{
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/*
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* LSI_CTL has target PID @ 14
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*/
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io7->csrs->PO7_LSI_CTL[which].csr = ((unsigned long)where << 14);
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mb();
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io7->csrs->PO7_LSI_CTL[which].csr;
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}
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static void __init
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init_one_io7_msi(struct io7 *io7, unsigned int which, unsigned int where)
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{
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/*
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* MSI_CTL has target PID @ 14
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*/
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io7->csrs->PO7_MSI_CTL[which].csr = ((unsigned long)where << 14);
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mb();
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io7->csrs->PO7_MSI_CTL[which].csr;
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}
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static void __init
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init_io7_irqs(struct io7 *io7,
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struct irq_chip *lsi_ops,
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struct irq_chip *msi_ops)
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{
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long base = (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT) + 16;
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long i;
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printk("Initializing interrupts for IO7 at PE %u - base %lx\n",
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io7->pe, base);
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/*
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* Where should interrupts from this IO7 go?
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*
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* They really should be sent to the local CPU to avoid having to
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* traverse the mesh, but if it's not an SMP kernel, they have to
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* go to the boot CPU. Send them all to the boot CPU for now,
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* as each secondary starts, it can redirect it's local device
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* interrupts.
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*/
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printk(" Interrupts reported to CPU at PE %u\n", boot_cpuid);
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raw_spin_lock(&io7->irq_lock);
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/* set up the error irqs */
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io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, boot_cpuid);
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io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, boot_cpuid);
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io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, boot_cpuid);
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io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, boot_cpuid);
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io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, boot_cpuid);
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/* Set up the lsi irqs. */
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for (i = 0; i < 128; ++i) {
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irq_set_chip_and_handler(base + i, lsi_ops, handle_level_irq);
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irq_set_status_flags(i, IRQ_LEVEL);
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}
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/* Disable the implemented irqs in hardware. */
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for (i = 0; i < 0x60; ++i)
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init_one_io7_lsi(io7, i, boot_cpuid);
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init_one_io7_lsi(io7, 0x74, boot_cpuid);
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init_one_io7_lsi(io7, 0x75, boot_cpuid);
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/* Set up the msi irqs. */
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for (i = 128; i < (128 + 512); ++i) {
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irq_set_chip_and_handler(base + i, msi_ops, handle_level_irq);
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irq_set_status_flags(i, IRQ_LEVEL);
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}
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for (i = 0; i < 16; ++i)
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init_one_io7_msi(io7, i, boot_cpuid);
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raw_spin_unlock(&io7->irq_lock);
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}
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static void __init
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marvel_init_irq(void)
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{
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int i;
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struct io7 *io7 = NULL;
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/* Reserve the legacy irqs. */
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for (i = 0; i < 16; ++i) {
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irq_set_chip_and_handler(i, &marvel_legacy_irq_type,
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handle_level_irq);
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}
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/* Init the io7 irqs. */
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for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )
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init_io7_irqs(io7, &io7_lsi_irq_type, &io7_msi_irq_type);
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}
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static int
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marvel_map_irq(const struct pci_dev *cdev, u8 slot, u8 pin)
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{
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struct pci_dev *dev = (struct pci_dev *)cdev;
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struct pci_controller *hose = dev->sysdata;
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struct io7_port *io7_port = hose->sysdata;
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struct io7 *io7 = io7_port->io7;
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int msi_loc, msi_data_off;
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u16 msg_ctl;
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u16 msg_dat;
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u8 intline;
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int irq;
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pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
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irq = intline;
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msi_loc = dev->msi_cap;
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msg_ctl = 0;
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if (msi_loc)
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pci_read_config_word(dev, msi_loc + PCI_MSI_FLAGS, &msg_ctl);
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if (msg_ctl & PCI_MSI_FLAGS_ENABLE) {
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msi_data_off = PCI_MSI_DATA_32;
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if (msg_ctl & PCI_MSI_FLAGS_64BIT)
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msi_data_off = PCI_MSI_DATA_64;
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pci_read_config_word(dev, msi_loc + msi_data_off, &msg_dat);
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irq = msg_dat & 0x1ff; /* we use msg_data<8:0> */
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irq += 0x80; /* offset for lsi */
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#if 1
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printk("PCI:%d:%d:%d (hose %d) is using MSI\n",
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dev->bus->number,
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PCI_SLOT(dev->devfn),
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PCI_FUNC(dev->devfn),
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hose->index);
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printk(" %d message(s) from 0x%04x\n",
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1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),
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msg_dat);
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printk(" reporting on %d IRQ(s) from %d (0x%x)\n",
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1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),
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(irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT),
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(irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT));
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#endif
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#if 0
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pci_write_config_word(dev, msi_loc + PCI_MSI_FLAGS,
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msg_ctl & ~PCI_MSI_FLAGS_ENABLE);
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pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
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irq = intline;
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printk(" forcing LSI interrupt on irq %d [0x%x]\n", irq, irq);
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#endif
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}
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irq += 16; /* offset for legacy */
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irq |= io7->pe << MARVEL_IRQ_VEC_PE_SHIFT; /* merge the pid */
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return irq;
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}
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static void __init
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marvel_init_pci(void)
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{
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struct io7 *io7;
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marvel_register_error_handlers();
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/* Indicate that we trust the console to configure things properly */
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pci_set_flags(PCI_PROBE_ONLY);
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common_init_pci();
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locate_and_init_vga(NULL);
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/* Clear any io7 errors. */
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for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )
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io7_clear_errors(io7);
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}
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static void __init
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marvel_init_rtc(void)
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{
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init_rtc_irq(NULL);
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}
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static void
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marvel_smp_callin(void)
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{
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int cpuid = hard_smp_processor_id();
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struct io7 *io7 = marvel_find_io7(cpuid);
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unsigned int i;
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if (!io7)
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return;
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/*
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* There is a local IO7 - redirect all of its interrupts here.
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*/
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printk("Redirecting IO7 interrupts to local CPU at PE %u\n", cpuid);
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/* Redirect the error IRQS here. */
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io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, cpuid);
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io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, cpuid);
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io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, cpuid);
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io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, cpuid);
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io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, cpuid);
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/* Redirect the implemented LSIs here. */
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for (i = 0; i < 0x60; ++i)
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io7_redirect_one_lsi(io7, i, cpuid);
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io7_redirect_one_lsi(io7, 0x74, cpuid);
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io7_redirect_one_lsi(io7, 0x75, cpuid);
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/* Redirect the MSIs here. */
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for (i = 0; i < 16; ++i)
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io7_redirect_one_msi(io7, i, cpuid);
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}
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/*
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* System Vectors
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*/
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struct alpha_machine_vector marvel_ev7_mv __initmv = {
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.vector_name = "MARVEL/EV7",
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DO_EV7_MMU,
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.rtc_port = 0x70,
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.rtc_boot_cpu_only = 1,
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DO_MARVEL_IO,
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.machine_check = marvel_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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.pci_dac_offset = IO7_DAC_OFFSET,
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.nr_irqs = MARVEL_NR_IRQS,
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.device_interrupt = io7_device_interrupt,
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.agp_info = marvel_agp_info,
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.smp_callin = marvel_smp_callin,
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.init_arch = marvel_init_arch,
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.init_irq = marvel_init_irq,
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.init_rtc = marvel_init_rtc,
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.init_pci = marvel_init_pci,
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.kill_arch = marvel_kill_arch,
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.pci_map_irq = marvel_map_irq,
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.pci_swizzle = common_swizzle,
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.pa_to_nid = marvel_pa_to_nid,
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.cpuid_to_nid = marvel_cpuid_to_nid,
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.node_mem_start = marvel_node_mem_start,
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.node_mem_size = marvel_node_mem_size,
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};
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ALIAS_MV(marvel_ev7)
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