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>
18 #include <asm/system.h>
20 #define __EXTERN_INLINE inline
22 #include <asm/jensen.h>
23 #undef __EXTERN_INLINE
27 #include <asm/mmu_context.h>
28 #include <asm/pgtable.h>
29 #include <asm/tlbflush.h>
34 #include "machvec_impl.h"
38 * Jensen is special: the vector is 0x8X0 for EISA interrupt X, and
39 * 0x9X0 for the local motherboard interrupts.
41 * Note especially that those local interrupts CANNOT be masked,
42 * which causes much of the pain below...
46 * 0x800 - IRQ0 interval timer (not used, as we use the RTC timer)
47 * 0x810 - IRQ1 line printer (duh..)
48 * 0x860 - IRQ6 floppy disk
55 * PCI-based systems are more sane: they don't have the local
56 * interrupts at all, and have only normal PCI interrupts from
57 * devices. Happily it's easy enough to do a sane mapping from the
60 * Note that this means that we may have to do a hardware
61 * "local_op" to a different interrupt than we report to the rest of the
66 jensen_local_startup(unsigned int irq)
68 /* the parport is really hw IRQ 1, silly Jensen. */
70 i8259a_startup_irq(1);
76 jensen_local_shutdown(unsigned int irq)
78 /* the parport is really hw IRQ 1, silly Jensen. */
80 i8259a_disable_irq(1);
84 jensen_local_enable(unsigned int irq)
86 /* the parport is really hw IRQ 1, silly Jensen. */
92 jensen_local_disable(unsigned int irq)
94 /* the parport is really hw IRQ 1, silly Jensen. */
96 i8259a_disable_irq(1);
100 jensen_local_ack(unsigned int irq)
102 /* the parport is really hw IRQ 1, silly Jensen. */
104 i8259a_mask_and_ack_irq(1);
108 jensen_local_end(unsigned int irq)
110 /* the parport is really hw IRQ 1, silly Jensen. */
115 static struct irq_chip jensen_local_irq_type = {
117 .startup = jensen_local_startup,
118 .shutdown = jensen_local_shutdown,
119 .enable = jensen_local_enable,
120 .disable = jensen_local_disable,
121 .ack = jensen_local_ack,
122 .end = jensen_local_end,
126 jensen_device_interrupt(unsigned long vector)
132 printk("Whee.. NMI received. Probable hardware error\n");
133 printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
136 /* local device interrupts: */
137 case 0x900: irq = 4; break; /* com1 -> irq 4 */
138 case 0x920: irq = 3; break; /* com2 -> irq 3 */
139 case 0x980: irq = 1; break; /* kbd -> irq 1 */
140 case 0x990: irq = 9; break; /* mouse -> irq 9 */
143 if (vector > 0x900) {
144 printk("Unknown local interrupt %lx\n", vector);
148 irq = (vector - 0x800) >> 4;
154 /* If there is no handler yet... */
155 if (!irq_has_action(irq)) {
156 /* If it is a local interrupt that cannot be masked... */
159 /* Clear keyboard/mouse state */
162 /* Reset serial ports */
174 /* A useful bit of code to find out if an interrupt is going wild. */
176 static unsigned int last_msg = 0, last_cc = 0;
177 static int last_irq = -1, count = 0;
180 __asm __volatile("rpcc %0" : "=r"(cc));
182 #define JENSEN_CYCLES_PER_SEC (150000000)
183 if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) ||
185 printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n",
186 irq, count, cc-last_cc, get_irq_regs()->pc);
199 jensen_init_irq(void)
203 set_irq_chip_and_handler(1, &jensen_local_irq_type, alpha_do_IRQ);
204 set_irq_chip_and_handler(4, &jensen_local_irq_type, alpha_do_IRQ);
205 set_irq_chip_and_handler(3, &jensen_local_irq_type, alpha_do_IRQ);
206 set_irq_chip_and_handler(7, &jensen_local_irq_type, alpha_do_IRQ);
207 set_irq_chip_and_handler(9, &jensen_local_irq_type, alpha_do_IRQ);
209 common_init_isa_dma();
213 jensen_init_arch(void)
215 struct pci_controller *hose;
217 static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, };
219 isa_bridge = &fake_isa_bridge;
222 /* Create a hose so that we can report i/o base addresses to
225 pci_isa_hose = hose = alloc_pci_controller();
226 hose->io_space = &ioport_resource;
227 hose->mem_space = &iomem_resource;
230 hose->sparse_mem_base = EISA_MEM - IDENT_ADDR;
231 hose->dense_mem_base = 0;
232 hose->sparse_io_base = EISA_IO - IDENT_ADDR;
233 hose->dense_io_base = 0;
235 hose->sg_isa = hose->sg_pci = NULL;
236 __direct_map_base = 0;
237 __direct_map_size = 0xffffffff;
241 jensen_machine_check(unsigned long vector, unsigned long la)
243 printk(KERN_CRIT "Machine check\n");
250 struct alpha_machine_vector jensen_mv __initmv = {
251 .vector_name = "Jensen",
253 IO_LITE(JENSEN,jensen),
254 .machine_check = jensen_machine_check,
255 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
257 .rtc_get_time = common_get_rtc_time,
258 .rtc_set_time = common_set_rtc_time,
261 .device_interrupt = jensen_device_interrupt,
263 .init_arch = jensen_init_arch,
264 .init_irq = jensen_init_irq,
265 .init_rtc = common_init_rtc,