420 lines
9.3 KiB
C
420 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/alpha/kernel/sys_titan.c
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*
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* Copyright (C) 1995 David A Rusling
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* Copyright (C) 1996, 1999 Jay A Estabrook
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* Copyright (C) 1998, 1999 Richard Henderson
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* Copyright (C) 1999, 2000 Jeff Wiedemeier
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*
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* Code supporting TITAN systems (EV6+TITAN), currently:
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* Privateer
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* Falcon
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* Granite
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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_titan.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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#include "err_impl.h"
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/*
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* Titan generic
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*/
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/*
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* Titan supports up to 4 CPUs
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*/
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static unsigned long titan_cpu_irq_affinity[4] = { ~0UL, ~0UL, ~0UL, ~0UL };
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/*
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* Mask is set (1) if enabled
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*/
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static unsigned long titan_cached_irq_mask;
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/*
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* Need SMP-safe access to interrupt CSRs
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*/
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DEFINE_SPINLOCK(titan_irq_lock);
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static void
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titan_update_irq_hw(unsigned long mask)
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{
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register titan_cchip *cchip = TITAN_cchip;
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unsigned long isa_enable = 1UL << 55;
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register int bcpu = boot_cpuid;
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#ifdef CONFIG_SMP
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cpumask_t cpm;
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volatile unsigned long *dim0, *dim1, *dim2, *dim3;
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unsigned long mask0, mask1, mask2, mask3, dummy;
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cpumask_copy(&cpm, cpu_present_mask);
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mask &= ~isa_enable;
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mask0 = mask & titan_cpu_irq_affinity[0];
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mask1 = mask & titan_cpu_irq_affinity[1];
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mask2 = mask & titan_cpu_irq_affinity[2];
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mask3 = mask & titan_cpu_irq_affinity[3];
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if (bcpu == 0) mask0 |= isa_enable;
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else if (bcpu == 1) mask1 |= isa_enable;
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else if (bcpu == 2) mask2 |= isa_enable;
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else mask3 |= isa_enable;
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dim0 = &cchip->dim0.csr;
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dim1 = &cchip->dim1.csr;
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dim2 = &cchip->dim2.csr;
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dim3 = &cchip->dim3.csr;
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if (!cpumask_test_cpu(0, &cpm)) dim0 = &dummy;
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if (!cpumask_test_cpu(1, &cpm)) dim1 = &dummy;
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if (!cpumask_test_cpu(2, &cpm)) dim2 = &dummy;
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if (!cpumask_test_cpu(3, &cpm)) dim3 = &dummy;
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*dim0 = mask0;
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*dim1 = mask1;
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*dim2 = mask2;
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*dim3 = mask3;
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mb();
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*dim0;
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*dim1;
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*dim2;
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*dim3;
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#else
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volatile unsigned long *dimB;
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dimB = &cchip->dim0.csr;
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if (bcpu == 1) dimB = &cchip->dim1.csr;
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else if (bcpu == 2) dimB = &cchip->dim2.csr;
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else if (bcpu == 3) dimB = &cchip->dim3.csr;
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*dimB = mask | isa_enable;
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mb();
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*dimB;
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#endif
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}
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static inline void
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titan_enable_irq(struct irq_data *d)
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{
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unsigned int irq = d->irq;
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spin_lock(&titan_irq_lock);
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titan_cached_irq_mask |= 1UL << (irq - 16);
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titan_update_irq_hw(titan_cached_irq_mask);
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spin_unlock(&titan_irq_lock);
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}
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static inline void
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titan_disable_irq(struct irq_data *d)
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{
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unsigned int irq = d->irq;
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spin_lock(&titan_irq_lock);
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titan_cached_irq_mask &= ~(1UL << (irq - 16));
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titan_update_irq_hw(titan_cached_irq_mask);
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spin_unlock(&titan_irq_lock);
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}
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static void
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titan_cpu_set_irq_affinity(unsigned int irq, cpumask_t affinity)
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{
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int cpu;
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for (cpu = 0; cpu < 4; cpu++) {
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if (cpumask_test_cpu(cpu, &affinity))
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titan_cpu_irq_affinity[cpu] |= 1UL << irq;
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else
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titan_cpu_irq_affinity[cpu] &= ~(1UL << irq);
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}
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}
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static int
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titan_set_irq_affinity(struct irq_data *d, const struct cpumask *affinity,
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bool force)
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{
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unsigned int irq = d->irq;
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spin_lock(&titan_irq_lock);
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titan_cpu_set_irq_affinity(irq - 16, *affinity);
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titan_update_irq_hw(titan_cached_irq_mask);
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spin_unlock(&titan_irq_lock);
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return 0;
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}
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static void
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titan_device_interrupt(unsigned long vector)
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{
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printk("titan_device_interrupt: NOT IMPLEMENTED YET!!\n");
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}
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static void
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titan_srm_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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handle_irq(irq);
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}
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static void __init
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init_titan_irqs(struct irq_chip * ops, int imin, int imax)
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{
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long i;
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for (i = imin; i <= imax; ++i) {
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irq_set_chip_and_handler(i, ops, handle_level_irq);
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irq_set_status_flags(i, IRQ_LEVEL);
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}
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}
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static struct irq_chip titan_irq_type = {
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.name = "TITAN",
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.irq_unmask = titan_enable_irq,
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.irq_mask = titan_disable_irq,
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.irq_mask_ack = titan_disable_irq,
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.irq_set_affinity = titan_set_irq_affinity,
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};
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static irqreturn_t
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titan_intr_nop(int irq, void *dev_id)
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{
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/*
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* This is a NOP interrupt handler for the purposes of
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* event counting -- just return.
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*/
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return IRQ_HANDLED;
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}
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static void __init
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titan_init_irq(void)
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{
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if (alpha_using_srm && !alpha_mv.device_interrupt)
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alpha_mv.device_interrupt = titan_srm_device_interrupt;
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if (!alpha_mv.device_interrupt)
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alpha_mv.device_interrupt = titan_device_interrupt;
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titan_update_irq_hw(0);
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init_titan_irqs(&titan_irq_type, 16, 63 + 16);
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}
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static void __init
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titan_legacy_init_irq(void)
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{
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/* init the legacy dma controller */
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outb(0, DMA1_RESET_REG);
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outb(0, DMA2_RESET_REG);
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outb(DMA_MODE_CASCADE, DMA2_MODE_REG);
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outb(0, DMA2_MASK_REG);
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/* init the legacy irq controller */
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init_i8259a_irqs();
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/* init the titan irqs */
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titan_init_irq();
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}
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void
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titan_dispatch_irqs(u64 mask)
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{
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unsigned long vector;
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/*
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* Mask down to those interrupts which are enable on this processor
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*/
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mask &= titan_cpu_irq_affinity[smp_processor_id()];
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/*
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* Dispatch all requested interrupts
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*/
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while (mask) {
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/* convert to SRM vector... priority is <63> -> <0> */
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vector = 63 - __kernel_ctlz(mask);
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mask &= ~(1UL << vector); /* clear it out */
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vector = 0x900 + (vector << 4); /* convert to SRM vector */
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/* dispatch it */
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alpha_mv.device_interrupt(vector);
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}
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}
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/*
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* Titan Family
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*/
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static void __init
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titan_request_irq(unsigned int irq, irq_handler_t handler,
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unsigned long irqflags, const char *devname,
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void *dev_id)
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{
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int err;
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err = request_irq(irq, handler, irqflags, devname, dev_id);
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if (err) {
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printk("titan_request_irq for IRQ %d returned %d; ignoring\n",
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irq, err);
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}
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}
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static void __init
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titan_late_init(void)
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{
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/*
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* Enable the system error interrupts. These interrupts are
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* all reported to the kernel as machine checks, so the handler
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* is a nop so it can be called to count the individual events.
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*/
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titan_request_irq(63+16, titan_intr_nop, 0,
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"CChip Error", NULL);
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titan_request_irq(62+16, titan_intr_nop, 0,
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"PChip 0 H_Error", NULL);
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titan_request_irq(61+16, titan_intr_nop, 0,
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"PChip 1 H_Error", NULL);
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titan_request_irq(60+16, titan_intr_nop, 0,
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"PChip 0 C_Error", NULL);
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titan_request_irq(59+16, titan_intr_nop, 0,
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"PChip 1 C_Error", NULL);
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/*
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* Register our error handlers.
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*/
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titan_register_error_handlers();
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/*
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* Check if the console left us any error logs.
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*/
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cdl_check_console_data_log();
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}
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static int
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titan_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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u8 intline;
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int irq;
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/* Get the current intline. */
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pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
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irq = intline;
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/* Is it explicitly routed through ISA? */
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if ((irq & 0xF0) == 0xE0)
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return irq;
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/* Offset by 16 to make room for ISA interrupts 0 - 15. */
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return irq + 16;
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}
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static void __init
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titan_init_pci(void)
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{
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/*
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* This isn't really the right place, but there's some init
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* that needs to be done after everything is basically up.
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*/
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titan_late_init();
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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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SMC669_Init(0);
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locate_and_init_vga(NULL);
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}
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/*
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* Privateer
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*/
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static void __init
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privateer_init_pci(void)
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{
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/*
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* Hook a couple of extra err interrupts that the
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* common titan code won't.
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*/
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titan_request_irq(53+16, titan_intr_nop, 0,
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"NMI", NULL);
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titan_request_irq(50+16, titan_intr_nop, 0,
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"Temperature Warning", NULL);
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/*
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* Finish with the common version.
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*/
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return titan_init_pci();
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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 titan_mv __initmv = {
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.vector_name = "TITAN",
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DO_EV6_MMU,
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DO_DEFAULT_RTC,
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DO_TITAN_IO,
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.machine_check = titan_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 = TITAN_DAC_OFFSET,
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.nr_irqs = 80, /* 64 + 16 */
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/* device_interrupt will be filled in by titan_init_irq */
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.agp_info = titan_agp_info,
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.init_arch = titan_init_arch,
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.init_irq = titan_legacy_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = titan_init_pci,
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.kill_arch = titan_kill_arch,
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.pci_map_irq = titan_map_irq,
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.pci_swizzle = common_swizzle,
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};
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ALIAS_MV(titan)
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struct alpha_machine_vector privateer_mv __initmv = {
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.vector_name = "PRIVATEER",
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DO_EV6_MMU,
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DO_DEFAULT_RTC,
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DO_TITAN_IO,
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.machine_check = privateer_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 = TITAN_DAC_OFFSET,
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.nr_irqs = 80, /* 64 + 16 */
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/* device_interrupt will be filled in by titan_init_irq */
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.agp_info = titan_agp_info,
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.init_arch = titan_init_arch,
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.init_irq = titan_legacy_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = privateer_init_pci,
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.kill_arch = titan_kill_arch,
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.pci_map_irq = titan_map_irq,
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.pci_swizzle = common_swizzle,
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};
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/* No alpha_mv alias for privateer since we compile it
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in unconditionally with titan; setup_arch knows how to cope. */
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