/* *	linux/arch/alpha/kernel/sys_jensen.c * *	Copyright (C) 1995 Linus Torvalds *	Copyright (C) 1998, 1999 Richard Henderson * * Code supporting the Jensen. */ #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> #define __EXTERN_INLINE inline#include <asm/io.h>#include <asm/jensen.h>#undef  __EXTERN_INLINE #include <asm/dma.h>#include <asm/irq.h>#include <asm/mmu_context.h>#include <asm/pgtable.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 voidjensen_local_enable(struct irq_data *d){	/* the parport is really hw IRQ 1, silly Jensen.  */	if (d->irq == 7)		i8259a_enable_irq(d);} static voidjensen_local_disable(struct irq_data *d){	/* the parport is really hw IRQ 1, silly Jensen.  */	if (d->irq == 7)		i8259a_disable_irq(d);} static voidjensen_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 __initjensen_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 __initjensen_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 voidjensen_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)