2 * linux/arch/alpha/kernel/sys_jensen.c
4 * Copyright (C) 1995 Linus Torvalds
5 * Copyright (C) 1998, 1999 Richard Henderson
7 * Code supporting the Jensen.
10 #include <linux/kernel.h>
11 #include <linux/types.h>
13 #include <linux/sched.h>
14 #include <linux/pci.h>
15 #include <linux/init.h>
17 #include <asm/ptrace.h>
19 #define __EXTERN_INLINE inline
21 #include <asm/jensen.h>
22 #undef __EXTERN_INLINE
26 #include <asm/mmu_context.h>
27 #include <asm/pgtable.h>
28 #include <asm/tlbflush.h>
33 #include "machvec_impl.h"
37 * Jensen is special: the vector is 0x8X0 for EISA interrupt X, and
38 * 0x9X0 for the local motherboard interrupts.
40 * Note especially that those local interrupts CANNOT be masked,
41 * which causes much of the pain below...
45 * 0x800 - IRQ0 interval timer (not used, as we use the RTC timer)
46 * 0x810 - IRQ1 line printer (duh..)
47 * 0x860 - IRQ6 floppy disk
54 * PCI-based systems are more sane: they don't have the local
55 * interrupts at all, and have only normal PCI interrupts from
56 * devices. Happily it's easy enough to do a sane mapping from the
59 * Note that this means that we may have to do a hardware
60 * "local_op" to a different interrupt than we report to the rest of the
65 jensen_local_enable(struct irq_data *d)
67 /* the parport is really hw IRQ 1, silly Jensen. */
73 jensen_local_disable(struct irq_data *d)
75 /* the parport is really hw IRQ 1, silly Jensen. */
77 i8259a_disable_irq(d);
81 jensen_local_mask_ack(struct irq_data *d)
83 /* the parport is really hw IRQ 1, silly Jensen. */
85 i8259a_mask_and_ack_irq(d);
88 static struct irq_chip jensen_local_irq_type = {
90 .irq_unmask = jensen_local_enable,
91 .irq_mask = jensen_local_disable,
92 .irq_mask_ack = jensen_local_mask_ack,
96 jensen_device_interrupt(unsigned long vector)
102 printk("Whee.. NMI received. Probable hardware error\n");
103 printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
106 /* local device interrupts: */
107 case 0x900: irq = 4; break; /* com1 -> irq 4 */
108 case 0x920: irq = 3; break; /* com2 -> irq 3 */
109 case 0x980: irq = 1; break; /* kbd -> irq 1 */
110 case 0x990: irq = 9; break; /* mouse -> irq 9 */
113 if (vector > 0x900) {
114 printk("Unknown local interrupt %lx\n", vector);
118 irq = (vector - 0x800) >> 4;
124 /* If there is no handler yet... */
125 if (!irq_has_action(irq)) {
126 /* If it is a local interrupt that cannot be masked... */
129 /* Clear keyboard/mouse state */
132 /* Reset serial ports */
144 /* A useful bit of code to find out if an interrupt is going wild. */
146 static unsigned int last_msg = 0, last_cc = 0;
147 static int last_irq = -1, count = 0;
150 __asm __volatile("rpcc %0" : "=r"(cc));
152 #define JENSEN_CYCLES_PER_SEC (150000000)
153 if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) ||
155 printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n",
156 irq, count, cc-last_cc, get_irq_regs()->pc);
169 jensen_init_irq(void)
173 irq_set_chip_and_handler(1, &jensen_local_irq_type, handle_level_irq);
174 irq_set_chip_and_handler(4, &jensen_local_irq_type, handle_level_irq);
175 irq_set_chip_and_handler(3, &jensen_local_irq_type, handle_level_irq);
176 irq_set_chip_and_handler(7, &jensen_local_irq_type, handle_level_irq);
177 irq_set_chip_and_handler(9, &jensen_local_irq_type, handle_level_irq);
179 common_init_isa_dma();
183 jensen_init_arch(void)
185 struct pci_controller *hose;
187 static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, };
189 isa_bridge = &fake_isa_bridge;
192 /* Create a hose so that we can report i/o base addresses to
195 pci_isa_hose = hose = alloc_pci_controller();
196 hose->io_space = &ioport_resource;
197 hose->mem_space = &iomem_resource;
200 hose->sparse_mem_base = EISA_MEM - IDENT_ADDR;
201 hose->dense_mem_base = 0;
202 hose->sparse_io_base = EISA_IO - IDENT_ADDR;
203 hose->dense_io_base = 0;
205 hose->sg_isa = hose->sg_pci = NULL;
206 __direct_map_base = 0;
207 __direct_map_size = 0xffffffff;
211 jensen_machine_check(unsigned long vector, unsigned long la)
213 printk(KERN_CRIT "Machine check\n");
220 struct alpha_machine_vector jensen_mv __initmv = {
221 .vector_name = "Jensen",
223 IO_LITE(JENSEN,jensen),
224 .machine_check = jensen_machine_check,
225 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
229 .device_interrupt = jensen_device_interrupt,
231 .init_arch = jensen_init_arch,
232 .init_irq = jensen_init_irq,
233 .init_rtc = common_init_rtc,