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4bf859076b
The sys_cabriolet.c file includes support for multiple evaluation boards. pc164 and lx164 are for ev56 CPUs, while the eb164 is now the last supported machine that only supports ev5 but not ev56. Acked-by: Paul E. McKenney <paulmck@kernel.org> Acked-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
360 lines
10 KiB
C
360 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/alpha/kernel/sys_cabriolet.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, 2000 Richard Henderson
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*
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* Code supporting the PC164 and LX164.
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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_cia.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 "pc873xx.h"
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/* Note mask bit is true for DISABLED irqs. */
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static unsigned long cached_irq_mask = ~0UL;
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static inline void
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cabriolet_update_irq_hw(unsigned int irq, unsigned long mask)
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{
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int ofs = (irq - 16) / 8;
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outb(mask >> (16 + ofs * 8), 0x804 + ofs);
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}
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static inline void
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cabriolet_enable_irq(struct irq_data *d)
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{
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cabriolet_update_irq_hw(d->irq, cached_irq_mask &= ~(1UL << d->irq));
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}
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static void
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cabriolet_disable_irq(struct irq_data *d)
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{
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cabriolet_update_irq_hw(d->irq, cached_irq_mask |= 1UL << d->irq);
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}
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static struct irq_chip cabriolet_irq_type = {
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.name = "CABRIOLET",
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.irq_unmask = cabriolet_enable_irq,
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.irq_mask = cabriolet_disable_irq,
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.irq_mask_ack = cabriolet_disable_irq,
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};
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static void
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cabriolet_device_interrupt(unsigned long v)
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{
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unsigned long pld;
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unsigned int i;
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/* Read the interrupt summary registers */
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pld = inb(0x804) | (inb(0x805) << 8) | (inb(0x806) << 16);
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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 == 4) {
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isa_device_interrupt(v);
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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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common_init_irq(void (*srm_dev_int)(unsigned long v))
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{
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init_i8259a_irqs();
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if (alpha_using_srm) {
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alpha_mv.device_interrupt = srm_dev_int;
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init_srm_irqs(35, 0);
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}
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else {
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long i;
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outb(0xff, 0x804);
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outb(0xff, 0x805);
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outb(0xff, 0x806);
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for (i = 16; i < 35; ++i) {
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irq_set_chip_and_handler(i, &cabriolet_irq_type,
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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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common_init_isa_dma();
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if (request_irq(16 + 4, 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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#ifndef CONFIG_ALPHA_PC164
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static void __init
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cabriolet_init_irq(void)
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{
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common_init_irq(srm_device_interrupt);
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}
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#endif
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#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
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/* In theory, the PC164 has the same interrupt hardware as the other
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Cabriolet based systems. However, something got screwed up late
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in the development cycle which broke the interrupt masking hardware.
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Repeat, it is not possible to mask and ack interrupts. At all.
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In an attempt to work around this, while processing interrupts,
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we do not allow the IPL to drop below what it is currently. This
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prevents the possibility of recursion.
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??? Another option might be to force all PCI devices to use edge
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triggered rather than level triggered interrupts. That might be
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too invasive though. */
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static void
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pc164_srm_device_interrupt(unsigned long v)
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{
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__min_ipl = getipl();
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srm_device_interrupt(v);
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__min_ipl = 0;
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}
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static void
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pc164_device_interrupt(unsigned long v)
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{
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__min_ipl = getipl();
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cabriolet_device_interrupt(v);
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__min_ipl = 0;
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}
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static void __init
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pc164_init_irq(void)
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{
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common_init_irq(pc164_srm_device_interrupt);
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}
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#endif
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/*
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* The EB66+ is very similar to the EB66 except that it does not have
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* the on-board NCR and Tulip chips. In the code below, I have used
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* slot number to refer to the id select line and *not* the slot
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* number used in the EB66+ documentation. However, in the table,
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* I've given the slot number, the id select line and the Jxx number
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* that's printed on the board. The interrupt pins from the PCI slots
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* are wired into 3 interrupt summary registers at 0x804, 0x805 and
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* 0x806 ISA.
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*
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* In the table, -1 means don't assign an IRQ number. This is usually
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* because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
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*/
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static inline int
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eb66p_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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static char irq_tab[5][5] = {
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/*INT INTA INTB INTC INTD */
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{16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J25 */
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{16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J26 */
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{ -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
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{16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 9, slot 2, J27 */
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{16+3, 16+3, 16+8, 16+12, 16+6} /* IdSel 10, slot 3, J28 */
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};
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const long min_idsel = 6, max_idsel = 10, irqs_per_slot = 5;
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return COMMON_TABLE_LOOKUP;
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}
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/*
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* The AlphaPC64 is very similar to the EB66+ except that its slots
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* are numbered differently. In the code below, I have used slot
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* number to refer to the id select line and *not* the slot number
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* used in the AlphaPC64 documentation. However, in the table, I've
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* given the slot number, the id select line and the Jxx number that's
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* printed on the board. The interrupt pins from the PCI slots are
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* wired into 3 interrupt summary registers at 0x804, 0x805 and 0x806
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* ISA.
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*
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* In the table, -1 means don't assign an IRQ number. This is usually
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* because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
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*/
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static inline int
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cabriolet_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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static char irq_tab[5][5] = {
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/*INT INTA INTB INTC INTD */
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{ 16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 5, slot 2, J21 */
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{ 16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J19 */
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{ 16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J20 */
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{ -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
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{ 16+3, 16+3, 16+8, 16+12, 16+16} /* IdSel 9, slot 3, J22 */
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};
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const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
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return COMMON_TABLE_LOOKUP;
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}
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static inline void __init
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cabriolet_enable_ide(void)
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{
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if (pc873xx_probe() == -1) {
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printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n");
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} else {
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printk(KERN_INFO "Found %s Super IO chip at 0x%x\n",
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pc873xx_get_model(), pc873xx_get_base());
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pc873xx_enable_ide();
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}
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}
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static inline void __init
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cia_cab_init_pci(void)
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{
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cia_init_pci();
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cabriolet_enable_ide();
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}
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/*
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* The PC164 and LX164 have 19 PCI interrupts, four from each of the four
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* PCI slots, the SIO, PCI/IDE, and USB.
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*
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* Each of the interrupts can be individually masked. This is
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* accomplished by setting the appropriate bit in the mask register.
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* A bit is set by writing a "1" to the desired position in the mask
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* register and cleared by writing a "0". There are 3 mask registers
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* located at ISA address 804h, 805h and 806h.
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*
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* An I/O read at ISA address 804h, 805h, 806h will return the
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* state of the 11 PCI interrupts and not the state of the MASKED
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* interrupts.
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*
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* Note: A write to I/O 804h, 805h, and 806h the mask register will be
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* updated.
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*
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*
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* ISA DATA<7:0>
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* ISA +--------------------------------------------------------------+
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* ADDRESS | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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* +==============================================================+
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* 0x804 | INTB0 | USB | IDE | SIO | INTA3 |INTA2 | INTA1 | INTA0 |
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* +--------------------------------------------------------------+
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* 0x805 | INTD0 | INTC3 | INTC2 | INTC1 | INTC0 |INTB3 | INTB2 | INTB1 |
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* +--------------------------------------------------------------+
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* 0x806 | Rsrv | Rsrv | Rsrv | Rsrv | Rsrv |INTD3 | INTD2 | INTD1 |
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* +--------------------------------------------------------------+
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* * Rsrv = reserved bits
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* Note: The mask register is write-only.
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*
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* IdSel
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* 5 32 bit PCI option slot 2
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* 6 64 bit PCI option slot 0
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* 7 64 bit PCI option slot 1
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* 8 Saturn I/O
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* 9 32 bit PCI option slot 3
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* 10 USB
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* 11 IDE
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*
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*/
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static inline int
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alphapc164_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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static char irq_tab[7][5] = {
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/*INT INTA INTB INTC INTD */
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{ 16+2, 16+2, 16+9, 16+13, 16+17}, /* IdSel 5, slot 2, J20 */
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{ 16+0, 16+0, 16+7, 16+11, 16+15}, /* IdSel 6, slot 0, J29 */
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{ 16+1, 16+1, 16+8, 16+12, 16+16}, /* IdSel 7, slot 1, J26 */
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{ -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
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{ 16+3, 16+3, 16+10, 16+14, 16+18}, /* IdSel 9, slot 3, J19 */
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{ 16+6, 16+6, 16+6, 16+6, 16+6}, /* IdSel 10, USB */
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{ 16+5, 16+5, 16+5, 16+5, 16+5} /* IdSel 11, IDE */
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};
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const long min_idsel = 5, max_idsel = 11, irqs_per_slot = 5;
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return COMMON_TABLE_LOOKUP;
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}
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static inline void __init
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alphapc164_init_pci(void)
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{
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cia_init_pci();
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SMC93x_Init();
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}
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/*
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* The System Vector
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*/
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#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_LX164)
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struct alpha_machine_vector lx164_mv __initmv = {
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.vector_name = "LX164",
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DO_EV5_MMU,
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DO_DEFAULT_RTC,
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DO_PYXIS_IO,
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.machine_check = cia_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 = PYXIS_DAC_OFFSET,
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.nr_irqs = 35,
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.device_interrupt = cabriolet_device_interrupt,
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.init_arch = pyxis_init_arch,
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.init_irq = cabriolet_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = alphapc164_init_pci,
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.kill_arch = cia_kill_arch,
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.pci_map_irq = alphapc164_map_irq,
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.pci_swizzle = common_swizzle,
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};
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ALIAS_MV(lx164)
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#endif
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#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
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struct alpha_machine_vector pc164_mv __initmv = {
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.vector_name = "PC164",
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DO_EV5_MMU,
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DO_DEFAULT_RTC,
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DO_CIA_IO,
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.machine_check = cia_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 = CIA_DEFAULT_MEM_BASE,
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.nr_irqs = 35,
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.device_interrupt = pc164_device_interrupt,
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.init_arch = cia_init_arch,
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.init_irq = pc164_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = alphapc164_init_pci,
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.kill_arch = cia_kill_arch,
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.pci_map_irq = alphapc164_map_irq,
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.pci_swizzle = common_swizzle,
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};
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ALIAS_MV(pc164)
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#endif
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