204 lines
5.1 KiB
C
204 lines
5.1 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_rx164.c
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*
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* Copyright (C) 1995 David A Rusling
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* Copyright (C) 1996 Jay A Estabrook
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* Copyright (C) 1998, 1999 Richard Henderson
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*
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* Code supporting the RX164 (PCA56+POLARIS).
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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_polaris.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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/* Note mask bit is true for ENABLED irqs. */
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static unsigned long cached_irq_mask;
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static inline void
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rx164_update_irq_hw(unsigned long mask)
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{
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volatile unsigned int *irq_mask;
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irq_mask = (void *)(POLARIS_DENSE_CONFIG_BASE + 0x74);
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*irq_mask = mask;
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mb();
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*irq_mask;
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}
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static inline void
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rx164_enable_irq(struct irq_data *d)
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{
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rx164_update_irq_hw(cached_irq_mask |= 1UL << (d->irq - 16));
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}
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static void
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rx164_disable_irq(struct irq_data *d)
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{
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rx164_update_irq_hw(cached_irq_mask &= ~(1UL << (d->irq - 16)));
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}
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static struct irq_chip rx164_irq_type = {
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.name = "RX164",
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.irq_unmask = rx164_enable_irq,
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.irq_mask = rx164_disable_irq,
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.irq_mask_ack = rx164_disable_irq,
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};
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static void
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rx164_device_interrupt(unsigned long vector)
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{
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unsigned long pld;
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volatile unsigned int *dirr;
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long i;
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/* Read the interrupt summary register. On Polaris, this is
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the DIRR register in PCI config space (offset 0x84). */
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dirr = (void *)(POLARIS_DENSE_CONFIG_BASE + 0x84);
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pld = *dirr;
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/*
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* Now for every possible bit set, work through them and call
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* the appropriate interrupt handler.
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*/
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while (pld) {
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i = ffz(~pld);
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pld &= pld - 1; /* clear least bit set */
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if (i == 20) {
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isa_no_iack_sc_device_interrupt(vector);
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} else {
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handle_irq(16+i);
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}
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}
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}
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static void __init
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rx164_init_irq(void)
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{
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long i;
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rx164_update_irq_hw(0);
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for (i = 16; i < 40; ++i) {
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irq_set_chip_and_handler(i, &rx164_irq_type, handle_level_irq);
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irq_set_status_flags(i, IRQ_LEVEL);
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}
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init_i8259a_irqs();
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common_init_isa_dma();
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if (request_irq(16 + 20, no_action, 0, "isa-cascade", NULL))
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pr_err("Failed to register isa-cascade interrupt\n");
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}
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/*
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* The RX164 changed its interrupt routing between pass1 and pass2...
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*
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* PASS1:
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*
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* Slot IDSEL INTA INTB INTC INTD
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* 0 6 5 10 15 20
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* 1 7 4 9 14 19
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* 2 5 3 8 13 18
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* 3 9 2 7 12 17
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* 4 10 1 6 11 16
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*
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* PASS2:
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* Slot IDSEL INTA INTB INTC INTD
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* 0 5 1 7 12 17
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* 1 6 2 8 13 18
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* 2 8 3 9 14 19
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* 3 9 4 10 15 20
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* 4 10 5 11 16 6
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*
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*/
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/*
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* IdSel
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* 5 32 bit PCI option slot 0
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* 6 64 bit PCI option slot 1
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* 7 PCI-ISA bridge
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* 7 64 bit PCI option slot 2
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* 9 32 bit PCI option slot 3
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* 10 PCI-PCI bridge
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*
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*/
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static int
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rx164_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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#if 0
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static char irq_tab_pass1[6][5] __initdata = {
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/*INT INTA INTB INTC INTD */
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{ 16+3, 16+3, 16+8, 16+13, 16+18}, /* IdSel 5, slot 2 */
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{ 16+5, 16+5, 16+10, 16+15, 16+20}, /* IdSel 6, slot 0 */
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{ 16+4, 16+4, 16+9, 16+14, 16+19}, /* IdSel 7, slot 1 */
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{ -1, -1, -1, -1, -1}, /* IdSel 8, PCI/ISA bridge */
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{ 16+2, 16+2, 16+7, 16+12, 16+17}, /* IdSel 9, slot 3 */
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{ 16+1, 16+1, 16+6, 16+11, 16+16}, /* IdSel 10, slot 4 */
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};
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#else
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static char irq_tab[6][5] = {
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/*INT INTA INTB INTC INTD */
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{ 16+0, 16+0, 16+6, 16+11, 16+16}, /* IdSel 5, slot 0 */
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{ 16+1, 16+1, 16+7, 16+12, 16+17}, /* IdSel 6, slot 1 */
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{ -1, -1, -1, -1, -1}, /* IdSel 7, PCI/ISA bridge */
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{ 16+2, 16+2, 16+8, 16+13, 16+18}, /* IdSel 8, slot 2 */
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{ 16+3, 16+3, 16+9, 16+14, 16+19}, /* IdSel 9, slot 3 */
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{ 16+4, 16+4, 16+10, 16+15, 16+5}, /* IdSel 10, PCI-PCI */
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};
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#endif
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const long min_idsel = 5, max_idsel = 10, irqs_per_slot = 5;
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/* JRP - Need to figure out how to distinguish pass1 from pass2,
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and use the correct table. */
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return COMMON_TABLE_LOOKUP;
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}
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/*
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* The System Vector
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*/
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struct alpha_machine_vector rx164_mv __initmv = {
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.vector_name = "RX164",
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DO_EV5_MMU,
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DO_DEFAULT_RTC,
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DO_POLARIS_IO,
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.machine_check = polaris_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 = 40,
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.device_interrupt = rx164_device_interrupt,
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.init_arch = polaris_init_arch,
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.init_irq = rx164_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 = NULL,
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.pci_map_irq = rx164_map_irq,
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.pci_swizzle = common_swizzle,
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};
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ALIAS_MV(rx164)
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