/arch/alpha/kernel/sys_jensen.c
C | 275 lines | 181 code | 37 blank | 57 comment | 22 complexity | f84c38871a457518f2605cc11f46704a MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
1/*
2 * linux/arch/alpha/kernel/sys_jensen.c
3 *
4 * Copyright (C) 1995 Linus Torvalds
5 * Copyright (C) 1998, 1999 Richard Henderson
6 *
7 * Code supporting the Jensen.
8 */
9
10#include <linux/kernel.h>
11#include <linux/types.h>
12#include <linux/mm.h>
13#include <linux/sched.h>
14#include <linux/pci.h>
15#include <linux/init.h>
16
17#include <asm/ptrace.h>
18#include <asm/system.h>
19
20#define __EXTERN_INLINE inline
21#include <asm/io.h>
22#include <asm/jensen.h>
23#undef __EXTERN_INLINE
24
25#include <asm/dma.h>
26#include <asm/irq.h>
27#include <asm/mmu_context.h>
28#include <asm/pgtable.h>
29#include <asm/tlbflush.h>
30
31#include "proto.h"
32#include "irq_impl.h"
33#include "pci_impl.h"
34#include "machvec_impl.h"
35
36
37/*
38 * Jensen is special: the vector is 0x8X0 for EISA interrupt X, and
39 * 0x9X0 for the local motherboard interrupts.
40 *
41 * Note especially that those local interrupts CANNOT be masked,
42 * which causes much of the pain below...
43 *
44 * 0x660 - NMI
45 *
46 * 0x800 - IRQ0 interval timer (not used, as we use the RTC timer)
47 * 0x810 - IRQ1 line printer (duh..)
48 * 0x860 - IRQ6 floppy disk
49 *
50 * 0x900 - COM1
51 * 0x920 - COM2
52 * 0x980 - keyboard
53 * 0x990 - mouse
54 *
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
58 * Jensen.
59 *
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
62 * world.
63 */
64
65static unsigned int
66jensen_local_startup(unsigned int irq)
67{
68 /* the parport is really hw IRQ 1, silly Jensen. */
69 if (irq == 7)
70 i8259a_startup_irq(1);
71 else
72 /*
73 * For all true local interrupts, set the flag that prevents
74 * the IPL from being dropped during handler processing.
75 */
76 if (irq_desc[irq].action)
77 irq_desc[irq].action->flags |= IRQF_DISABLED;
78 return 0;
79}
80
81static void
82jensen_local_shutdown(unsigned int irq)
83{
84 /* the parport is really hw IRQ 1, silly Jensen. */
85 if (irq == 7)
86 i8259a_disable_irq(1);
87}
88
89static void
90jensen_local_enable(unsigned int irq)
91{
92 /* the parport is really hw IRQ 1, silly Jensen. */
93 if (irq == 7)
94 i8259a_enable_irq(1);
95}
96
97static void
98jensen_local_disable(unsigned int irq)
99{
100 /* the parport is really hw IRQ 1, silly Jensen. */
101 if (irq == 7)
102 i8259a_disable_irq(1);
103}
104
105static void
106jensen_local_ack(unsigned int irq)
107{
108 /* the parport is really hw IRQ 1, silly Jensen. */
109 if (irq == 7)
110 i8259a_mask_and_ack_irq(1);
111}
112
113static void
114jensen_local_end(unsigned int irq)
115{
116 /* the parport is really hw IRQ 1, silly Jensen. */
117 if (irq == 7)
118 i8259a_end_irq(1);
119}
120
121static struct irq_chip jensen_local_irq_type = {
122 .name = "LOCAL",
123 .startup = jensen_local_startup,
124 .shutdown = jensen_local_shutdown,
125 .enable = jensen_local_enable,
126 .disable = jensen_local_disable,
127 .ack = jensen_local_ack,
128 .end = jensen_local_end,
129};
130
131static void
132jensen_device_interrupt(unsigned long vector)
133{
134 int irq;
135
136 switch (vector) {
137 case 0x660:
138 printk("Whee.. NMI received. Probable hardware error\n");
139 printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
140 return;
141
142 /* local device interrupts: */
143 case 0x900: irq = 4; break; /* com1 -> irq 4 */
144 case 0x920: irq = 3; break; /* com2 -> irq 3 */
145 case 0x980: irq = 1; break; /* kbd -> irq 1 */
146 case 0x990: irq = 9; break; /* mouse -> irq 9 */
147
148 default:
149 if (vector > 0x900) {
150 printk("Unknown local interrupt %lx\n", vector);
151 return;
152 }
153
154 irq = (vector - 0x800) >> 4;
155 if (irq == 1)
156 irq = 7;
157 break;
158 }
159
160 /* If there is no handler yet... */
161 if (irq_desc[irq].action == NULL) {
162 /* If it is a local interrupt that cannot be masked... */
163 if (vector >= 0x900)
164 {
165 /* Clear keyboard/mouse state */
166 inb(0x64);
167 inb(0x60);
168 /* Reset serial ports */
169 inb(0x3fa);
170 inb(0x2fa);
171 outb(0x0c, 0x3fc);
172 outb(0x0c, 0x2fc);
173 /* Clear NMI */
174 outb(0,0x61);
175 outb(0,0x461);
176 }
177 }
178
179#if 0
180 /* A useful bit of code to find out if an interrupt is going wild. */
181 {
182 static unsigned int last_msg = 0, last_cc = 0;
183 static int last_irq = -1, count = 0;
184 unsigned int cc;
185
186 __asm __volatile("rpcc %0" : "=r"(cc));
187 ++count;
188#define JENSEN_CYCLES_PER_SEC (150000000)
189 if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) ||
190 irq != last_irq) {
191 printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n",
192 irq, count, cc-last_cc, get_irq_regs()->pc);
193 count = 0;
194 last_msg = cc;
195 last_irq = irq;
196 }
197 last_cc = cc;
198 }
199#endif
200
201 handle_irq(irq);
202}
203
204static void __init
205jensen_init_irq(void)
206{
207 init_i8259a_irqs();
208
209 irq_desc[1].chip = &jensen_local_irq_type;
210 irq_desc[4].chip = &jensen_local_irq_type;
211 irq_desc[3].chip = &jensen_local_irq_type;
212 irq_desc[7].chip = &jensen_local_irq_type;
213 irq_desc[9].chip = &jensen_local_irq_type;
214
215 common_init_isa_dma();
216}
217
218static void __init
219jensen_init_arch(void)
220{
221 struct pci_controller *hose;
222#ifdef CONFIG_PCI
223 static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, };
224
225 isa_bridge = &fake_isa_bridge;
226#endif
227
228 /* Create a hose so that we can report i/o base addresses to
229 userland. */
230
231 pci_isa_hose = hose = alloc_pci_controller();
232 hose->io_space = &ioport_resource;
233 hose->mem_space = &iomem_resource;
234 hose->index = 0;
235
236 hose->sparse_mem_base = EISA_MEM - IDENT_ADDR;
237 hose->dense_mem_base = 0;
238 hose->sparse_io_base = EISA_IO - IDENT_ADDR;
239 hose->dense_io_base = 0;
240
241 hose->sg_isa = hose->sg_pci = NULL;
242 __direct_map_base = 0;
243 __direct_map_size = 0xffffffff;
244}
245
246static void
247jensen_machine_check(unsigned long vector, unsigned long la)
248{
249 printk(KERN_CRIT "Machine check\n");
250}
251
252/*
253 * The System Vector
254 */
255
256struct alpha_machine_vector jensen_mv __initmv = {
257 .vector_name = "Jensen",
258 DO_EV4_MMU,
259 IO_LITE(JENSEN,jensen),
260 .machine_check = jensen_machine_check,
261 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
262 .rtc_port = 0x170,
263 .rtc_get_time = common_get_rtc_time,
264 .rtc_set_time = common_set_rtc_time,
265
266 .nr_irqs = 16,
267 .device_interrupt = jensen_device_interrupt,
268
269 .init_arch = jensen_init_arch,
270 .init_irq = jensen_init_irq,
271 .init_rtc = common_init_rtc,
272 .init_pci = NULL,
273 .kill_arch = NULL,
274};
275ALIAS_MV(jensen)