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237 lines
5.5 KiB
237 lines
5.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/arch/alpha/kernel/sys_jensen.c |
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* |
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* Copyright (C) 1995 Linus Torvalds |
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* Copyright (C) 1998, 1999 Richard Henderson |
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* |
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* Code supporting the Jensen. |
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*/ |
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#define __EXTERN_INLINE |
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#include <asm/io.h> |
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#include <asm/jensen.h> |
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#undef __EXTERN_INLINE |
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#include <linux/interrupt.h> |
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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 <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/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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/* |
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* Jensen is special: the vector is 0x8X0 for EISA interrupt X, and |
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* 0x9X0 for the local motherboard interrupts. |
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* |
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* Note especially that those local interrupts CANNOT be masked, |
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* which causes much of the pain below... |
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* |
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* 0x660 - NMI |
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* |
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* 0x800 - IRQ0 interval timer (not used, as we use the RTC timer) |
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* 0x810 - IRQ1 line printer (duh..) |
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* 0x860 - IRQ6 floppy disk |
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* |
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* 0x900 - COM1 |
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* 0x920 - COM2 |
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* 0x980 - keyboard |
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* 0x990 - mouse |
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* |
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* PCI-based systems are more sane: they don't have the local |
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* interrupts at all, and have only normal PCI interrupts from |
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* devices. Happily it's easy enough to do a sane mapping from the |
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* Jensen. |
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* |
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* Note that this means that we may have to do a hardware |
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* "local_op" to a different interrupt than we report to the rest of the |
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* world. |
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*/ |
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static void |
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jensen_local_enable(struct irq_data *d) |
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{ |
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/* the parport is really hw IRQ 1, silly Jensen. */ |
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if (d->irq == 7) |
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i8259a_enable_irq(d); |
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} |
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static void |
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jensen_local_disable(struct irq_data *d) |
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{ |
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/* the parport is really hw IRQ 1, silly Jensen. */ |
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if (d->irq == 7) |
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i8259a_disable_irq(d); |
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} |
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static void |
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jensen_local_mask_ack(struct irq_data *d) |
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{ |
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/* the parport is really hw IRQ 1, silly Jensen. */ |
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if (d->irq == 7) |
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i8259a_mask_and_ack_irq(d); |
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} |
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static struct irq_chip jensen_local_irq_type = { |
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.name = "LOCAL", |
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.irq_unmask = jensen_local_enable, |
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.irq_mask = jensen_local_disable, |
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.irq_mask_ack = jensen_local_mask_ack, |
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}; |
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static void |
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jensen_device_interrupt(unsigned long vector) |
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{ |
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int irq; |
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switch (vector) { |
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case 0x660: |
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printk("Whee.. NMI received. Probable hardware error\n"); |
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printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461)); |
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return; |
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/* local device interrupts: */ |
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case 0x900: irq = 4; break; /* com1 -> irq 4 */ |
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case 0x920: irq = 3; break; /* com2 -> irq 3 */ |
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case 0x980: irq = 1; break; /* kbd -> irq 1 */ |
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case 0x990: irq = 9; break; /* mouse -> irq 9 */ |
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default: |
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if (vector > 0x900) { |
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printk("Unknown local interrupt %lx\n", vector); |
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return; |
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} |
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irq = (vector - 0x800) >> 4; |
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if (irq == 1) |
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irq = 7; |
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break; |
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} |
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/* If there is no handler yet... */ |
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if (!irq_has_action(irq)) { |
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/* If it is a local interrupt that cannot be masked... */ |
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if (vector >= 0x900) |
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{ |
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/* Clear keyboard/mouse state */ |
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inb(0x64); |
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inb(0x60); |
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/* Reset serial ports */ |
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inb(0x3fa); |
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inb(0x2fa); |
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outb(0x0c, 0x3fc); |
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outb(0x0c, 0x2fc); |
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/* Clear NMI */ |
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outb(0,0x61); |
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outb(0,0x461); |
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} |
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} |
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#if 0 |
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/* A useful bit of code to find out if an interrupt is going wild. */ |
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{ |
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static unsigned int last_msg = 0, last_cc = 0; |
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static int last_irq = -1, count = 0; |
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unsigned int cc; |
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__asm __volatile("rpcc %0" : "=r"(cc)); |
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++count; |
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#define JENSEN_CYCLES_PER_SEC (150000000) |
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if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) || |
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irq != last_irq) { |
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printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n", |
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irq, count, cc-last_cc, get_irq_regs()->pc); |
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count = 0; |
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last_msg = cc; |
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last_irq = irq; |
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} |
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last_cc = cc; |
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} |
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#endif |
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handle_irq(irq); |
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} |
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static void __init |
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jensen_init_irq(void) |
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{ |
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init_i8259a_irqs(); |
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irq_set_chip_and_handler(1, &jensen_local_irq_type, handle_level_irq); |
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irq_set_chip_and_handler(4, &jensen_local_irq_type, handle_level_irq); |
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irq_set_chip_and_handler(3, &jensen_local_irq_type, handle_level_irq); |
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irq_set_chip_and_handler(7, &jensen_local_irq_type, handle_level_irq); |
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irq_set_chip_and_handler(9, &jensen_local_irq_type, handle_level_irq); |
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common_init_isa_dma(); |
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} |
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static void __init |
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jensen_init_arch(void) |
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{ |
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struct pci_controller *hose; |
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#ifdef CONFIG_PCI |
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static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, }; |
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isa_bridge = &fake_isa_bridge; |
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#endif |
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/* Create a hose so that we can report i/o base addresses to |
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userland. */ |
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pci_isa_hose = hose = alloc_pci_controller(); |
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hose->io_space = &ioport_resource; |
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hose->mem_space = &iomem_resource; |
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hose->index = 0; |
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hose->sparse_mem_base = EISA_MEM - IDENT_ADDR; |
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hose->dense_mem_base = 0; |
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hose->sparse_io_base = EISA_IO - IDENT_ADDR; |
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hose->dense_io_base = 0; |
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hose->sg_isa = hose->sg_pci = NULL; |
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__direct_map_base = 0; |
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__direct_map_size = 0xffffffff; |
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} |
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static void |
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jensen_machine_check(unsigned long vector, unsigned long la) |
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{ |
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printk(KERN_CRIT "Machine check\n"); |
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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 jensen_mv __initmv = { |
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.vector_name = "Jensen", |
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DO_EV4_MMU, |
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IO_LITE(JENSEN,jensen), |
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.machine_check = jensen_machine_check, |
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.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, |
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.rtc_port = 0x170, |
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.nr_irqs = 16, |
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.device_interrupt = jensen_device_interrupt, |
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.init_arch = jensen_init_arch, |
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.init_irq = jensen_init_irq, |
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.init_rtc = common_init_rtc, |
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.init_pci = NULL, |
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.kill_arch = NULL, |
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}; |
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ALIAS_MV(jensen)
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