Linux-2.6.12-rc2
[linux-2.6.git] / arch / alpha / kernel / sys_jensen.c
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
65 static unsigned int
66 jensen_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 |= SA_INTERRUPT;
78         return 0;
79 }
80
81 static void
82 jensen_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
89 static void
90 jensen_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
97 static void
98 jensen_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
105 static void
106 jensen_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
113 static void
114 jensen_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
121 static struct hw_interrupt_type jensen_local_irq_type = {
122         .typename       = "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
131 static void 
132 jensen_device_interrupt(unsigned long vector, struct pt_regs * regs)
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, 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, regs);
202 }
203
204 static void __init
205 jensen_init_irq(void)
206 {
207         init_i8259a_irqs();
208
209         irq_desc[1].handler = &jensen_local_irq_type;
210         irq_desc[4].handler = &jensen_local_irq_type;
211         irq_desc[3].handler = &jensen_local_irq_type;
212         irq_desc[7].handler = &jensen_local_irq_type;
213         irq_desc[9].handler = &jensen_local_irq_type;
214
215         common_init_isa_dma();
216 }
217
218 static void __init
219 jensen_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
246 static void
247 jensen_machine_check (u64 vector, u64 la, struct pt_regs *regs)
248 {
249         printk(KERN_CRIT "Machine check\n");
250 }
251
252
253 /*
254  * The System Vector
255  */
256
257 struct alpha_machine_vector jensen_mv __initmv = {
258         .vector_name            = "Jensen",
259         DO_EV4_MMU,
260         IO_LITE(JENSEN,jensen),
261         .machine_check          = jensen_machine_check,
262         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
263         .rtc_port               = 0x170,
264
265         .nr_irqs                = 16,
266         .device_interrupt       = jensen_device_interrupt,
267
268         .init_arch              = jensen_init_arch,
269         .init_irq               = jensen_init_irq,
270         .init_rtc               = common_init_rtc,
271         .init_pci               = NULL,
272         .kill_arch              = NULL,
273 };
274 ALIAS_MV(jensen)