diff options
Diffstat (limited to 'arch/alpha/kernel/sys_jensen.c')
| -rw-r--r-- | arch/alpha/kernel/sys_jensen.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/arch/alpha/kernel/sys_jensen.c b/arch/alpha/kernel/sys_jensen.c new file mode 100644 index 000000000..5c9c88428 --- /dev/null +++ b/arch/alpha/kernel/sys_jensen.c @@ -0,0 +1,237 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/arch/alpha/kernel/sys_jensen.c + * + * Copyright (C) 1995 Linus Torvalds + * Copyright (C) 1998, 1999 Richard Henderson + * + * Code supporting the Jensen. + */ +#define __EXTERN_INLINE +#include <asm/io.h> +#include <asm/jensen.h> +#undef __EXTERN_INLINE + +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/sched.h> +#include <linux/pci.h> +#include <linux/init.h> + +#include <asm/ptrace.h> + +#include <asm/dma.h> +#include <asm/irq.h> +#include <asm/mmu_context.h> +#include <asm/tlbflush.h> + +#include "proto.h" +#include "irq_impl.h" +#include "pci_impl.h" +#include "machvec_impl.h" + + +/* + * Jensen is special: the vector is 0x8X0 for EISA interrupt X, and + * 0x9X0 for the local motherboard interrupts. + * + * Note especially that those local interrupts CANNOT be masked, + * which causes much of the pain below... + * + * 0x660 - NMI + * + * 0x800 - IRQ0 interval timer (not used, as we use the RTC timer) + * 0x810 - IRQ1 line printer (duh..) + * 0x860 - IRQ6 floppy disk + * + * 0x900 - COM1 + * 0x920 - COM2 + * 0x980 - keyboard + * 0x990 - mouse + * + * PCI-based systems are more sane: they don't have the local + * interrupts at all, and have only normal PCI interrupts from + * devices. Happily it's easy enough to do a sane mapping from the + * Jensen. + * + * Note that this means that we may have to do a hardware + * "local_op" to a different interrupt than we report to the rest of the + * world. + */ + +static void +jensen_local_enable(struct irq_data *d) +{ + /* the parport is really hw IRQ 1, silly Jensen. */ + if (d->irq == 7) + i8259a_enable_irq(d); +} + +static void +jensen_local_disable(struct irq_data *d) +{ + /* the parport is really hw IRQ 1, silly Jensen. */ + if (d->irq == 7) + i8259a_disable_irq(d); +} + +static void +jensen_local_mask_ack(struct irq_data *d) +{ + /* the parport is really hw IRQ 1, silly Jensen. */ + if (d->irq == 7) + i8259a_mask_and_ack_irq(d); +} + +static struct irq_chip jensen_local_irq_type = { + .name = "LOCAL", + .irq_unmask = jensen_local_enable, + .irq_mask = jensen_local_disable, + .irq_mask_ack = jensen_local_mask_ack, +}; + +static void +jensen_device_interrupt(unsigned long vector) +{ + int irq; + + switch (vector) { + case 0x660: + printk("Whee.. NMI received. Probable hardware error\n"); + printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461)); + return; + + /* local device interrupts: */ + case 0x900: irq = 4; break; /* com1 -> irq 4 */ + case 0x920: irq = 3; break; /* com2 -> irq 3 */ + case 0x980: irq = 1; break; /* kbd -> irq 1 */ + case 0x990: irq = 9; break; /* mouse -> irq 9 */ + + default: + if (vector > 0x900) { + printk("Unknown local interrupt %lx\n", vector); + return; + } + + irq = (vector - 0x800) >> 4; + if (irq == 1) + irq = 7; + break; + } + + /* If there is no handler yet... */ + if (!irq_has_action(irq)) { + /* If it is a local interrupt that cannot be masked... */ + if (vector >= 0x900) + { + /* Clear keyboard/mouse state */ + inb(0x64); + inb(0x60); + /* Reset serial ports */ + inb(0x3fa); + inb(0x2fa); + outb(0x0c, 0x3fc); + outb(0x0c, 0x2fc); + /* Clear NMI */ + outb(0,0x61); + outb(0,0x461); + } + } + +#if 0 + /* A useful bit of code to find out if an interrupt is going wild. */ + { + static unsigned int last_msg = 0, last_cc = 0; + static int last_irq = -1, count = 0; + unsigned int cc; + + __asm __volatile("rpcc %0" : "=r"(cc)); + ++count; +#define JENSEN_CYCLES_PER_SEC (150000000) + if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) || + irq != last_irq) { + printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n", + irq, count, cc-last_cc, get_irq_regs()->pc); + count = 0; + last_msg = cc; + last_irq = irq; + } + last_cc = cc; + } +#endif + + handle_irq(irq); +} + +static void __init +jensen_init_irq(void) +{ + init_i8259a_irqs(); + + irq_set_chip_and_handler(1, &jensen_local_irq_type, handle_level_irq); + irq_set_chip_and_handler(4, &jensen_local_irq_type, handle_level_irq); + irq_set_chip_and_handler(3, &jensen_local_irq_type, handle_level_irq); + irq_set_chip_and_handler(7, &jensen_local_irq_type, handle_level_irq); + irq_set_chip_and_handler(9, &jensen_local_irq_type, handle_level_irq); + + common_init_isa_dma(); +} + +static void __init +jensen_init_arch(void) +{ + struct pci_controller *hose; +#ifdef CONFIG_PCI + static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, }; + + isa_bridge = &fake_isa_bridge; +#endif + + /* Create a hose so that we can report i/o base addresses to + userland. */ + + pci_isa_hose = hose = alloc_pci_controller(); + hose->io_space = &ioport_resource; + hose->mem_space = &iomem_resource; + hose->index = 0; + + hose->sparse_mem_base = EISA_MEM - IDENT_ADDR; + hose->dense_mem_base = 0; + hose->sparse_io_base = EISA_IO - IDENT_ADDR; + hose->dense_io_base = 0; + + hose->sg_isa = hose->sg_pci = NULL; + __direct_map_base = 0; + __direct_map_size = 0xffffffff; +} + +static void +jensen_machine_check(unsigned long vector, unsigned long la) +{ + printk(KERN_CRIT "Machine check\n"); +} + +/* + * The System Vector + */ + +struct alpha_machine_vector jensen_mv __initmv = { + .vector_name = "Jensen", + DO_EV4_MMU, + IO_LITE(JENSEN,jensen), + .machine_check = jensen_machine_check, + .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, + .rtc_port = 0x170, + + .nr_irqs = 16, + .device_interrupt = jensen_device_interrupt, + + .init_arch = jensen_init_arch, + .init_irq = jensen_init_irq, + .init_rtc = common_init_rtc, + .init_pci = NULL, + .kill_arch = NULL, +}; +ALIAS_MV(jensen) |