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fed up with those stupid warnings
[mmotm.git] / arch / alpha / kernel / sys_marvel.c
blobbbfc4f20ca72a2ed9f6e0ac2c3172fc81f8c33d1
1 /*
2 * linux/arch/alpha/kernel/sys_marvel.c
3 *
4 * Marvel / IO7 support
5 */
6
7 #include <linux/kernel.h>
8 #include <linux/types.h>
9 #include <linux/mm.h>
10 #include <linux/sched.h>
11 #include <linux/pci.h>
12 #include <linux/init.h>
13 #include <linux/bitops.h>
14
15 #include <asm/ptrace.h>
16 #include <asm/system.h>
17 #include <asm/dma.h>
18 #include <asm/irq.h>
19 #include <asm/mmu_context.h>
20 #include <asm/io.h>
21 #include <asm/pgtable.h>
22 #include <asm/core_marvel.h>
23 #include <asm/hwrpb.h>
24 #include <asm/tlbflush.h>
25 #include <asm/vga.h>
26 #include <asm/rtc.h>
27
28 #include "proto.h"
29 #include "err_impl.h"
30 #include "irq_impl.h"
31 #include "pci_impl.h"
32 #include "machvec_impl.h"
33
34 #if NR_IRQS < MARVEL_NR_IRQS
35 # error NR_IRQS < MARVEL_NR_IRQS !!!
36 #endif
37
38 \f
39 /*
40 * Interrupt handling.
41 */
42 static void
43 io7_device_interrupt(unsigned long vector)
44 {
45 unsigned int pid;
46 unsigned int irq;
47
48 /*
49 * Vector is 0x800 + (interrupt)
50 *
51 * where (interrupt) is:
52 *
53 * ...16|15 14|13 4|3 0
54 * -----+-----+--------+---
55 * PE | 0 | irq | 0
56 *
57 * where (irq) is
58 *
59 * 0x0800 - 0x0ff0 - 0x0800 + (LSI id << 4)
60 * 0x1000 - 0x2ff0 - 0x1000 + (MSI_DAT<8:0> << 4)
61 */
62 pid = vector >> 16;
63 irq = ((vector & 0xffff) - 0x800) >> 4;
64
65 irq += 16; /* offset for legacy */
66 irq &= MARVEL_IRQ_VEC_IRQ_MASK; /* not too many bits */
67 irq |= pid << MARVEL_IRQ_VEC_PE_SHIFT; /* merge the pid */
68
69 handle_irq(irq);
70 }
71
72 static volatile unsigned long *
73 io7_get_irq_ctl(unsigned int irq, struct io7 **pio7)
74 {
75 volatile unsigned long *ctl;
76 unsigned int pid;
77 struct io7 *io7;
78
79 pid = irq >> MARVEL_IRQ_VEC_PE_SHIFT;
80
81 if (!(io7 = marvel_find_io7(pid))) {
82 printk(KERN_ERR
83 "%s for nonexistent io7 -- vec %x, pid %d\n",
84 __func__, irq, pid);
85 return NULL;
86 }
87
88 irq &= MARVEL_IRQ_VEC_IRQ_MASK; /* isolate the vector */
89 irq -= 16; /* subtract legacy bias */
90
91 if (irq >= 0x180) {
92 printk(KERN_ERR
93 "%s for invalid irq -- pid %d adjusted irq %x\n",
94 __func__, pid, irq);
95 return NULL;
96 }
97
98 ctl = &io7->csrs->PO7_LSI_CTL[irq & 0xff].csr; /* assume LSI */
99 if (irq >= 0x80) /* MSI */
100 ctl = &io7->csrs->PO7_MSI_CTL[((irq - 0x80) >> 5) & 0x0f].csr;
101
102 if (pio7) *pio7 = io7;
103 return ctl;
104 }
105
106 static void
107 io7_enable_irq(unsigned int irq)
108 {
109 volatile unsigned long *ctl;
110 struct io7 *io7;
111
112 ctl = io7_get_irq_ctl(irq, &io7);
113 if (!ctl || !io7) {
114 printk(KERN_ERR "%s: get_ctl failed for irq %x\n",
115 __func__, irq);
116 return;
117 }
118
119 spin_lock(&io7->irq_lock);
120 *ctl |= 1UL << 24;
121 mb();
122 *ctl;
123 spin_unlock(&io7->irq_lock);
124 }
125
126 static void
127 io7_disable_irq(unsigned int irq)
128 {
129 volatile unsigned long *ctl;
130 struct io7 *io7;
131
132 ctl = io7_get_irq_ctl(irq, &io7);
133 if (!ctl || !io7) {
134 printk(KERN_ERR "%s: get_ctl failed for irq %x\n",
135 __func__, irq);
136 return;
137 }
138
139 spin_lock(&io7->irq_lock);
140 *ctl &= ~(1UL << 24);
141 mb();
142 *ctl;
143 spin_unlock(&io7->irq_lock);
144 }
145
146 static unsigned int
147 io7_startup_irq(unsigned int irq)
148 {
149 io7_enable_irq(irq);
150 return 0; /* never anything pending */
151 }
152
153 static void
154 io7_end_irq(unsigned int irq)
155 {
156 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
157 io7_enable_irq(irq);
158 }
159
160 static void
161 marvel_irq_noop(unsigned int irq)
162 {
163 return;
164 }
165
166 static unsigned int
167 marvel_irq_noop_return(unsigned int irq)
168 {
169 return 0;
170 }
171
172 static struct irq_chip marvel_legacy_irq_type = {
173 .typename = "LEGACY",
174 .startup = marvel_irq_noop_return,
175 .shutdown = marvel_irq_noop,
176 .enable = marvel_irq_noop,
177 .disable = marvel_irq_noop,
178 .ack = marvel_irq_noop,
179 .end = marvel_irq_noop,
180 };
181
182 static struct irq_chip io7_lsi_irq_type = {
183 .typename = "LSI",
184 .startup = io7_startup_irq,
185 .shutdown = io7_disable_irq,
186 .enable = io7_enable_irq,
187 .disable = io7_disable_irq,
188 .ack = io7_disable_irq,
189 .end = io7_end_irq,
190 };
191
192 static struct irq_chip io7_msi_irq_type = {
193 .typename = "MSI",
194 .startup = io7_startup_irq,
195 .shutdown = io7_disable_irq,
196 .enable = io7_enable_irq,
197 .disable = io7_disable_irq,
198 .ack = marvel_irq_noop,
199 .end = io7_end_irq,
200 };
201
202 static void
203 io7_redirect_irq(struct io7 *io7,
204 volatile unsigned long *csr,
205 unsigned int where)
206 {
207 unsigned long val;
208
209 val = *csr;
210 val &= ~(0x1ffUL << 24); /* clear the target pid */
211 val |= ((unsigned long)where << 24); /* set the new target pid */
212
213 *csr = val;
214 mb();
215 *csr;
216 }
217
218 static void
219 io7_redirect_one_lsi(struct io7 *io7, unsigned int which, unsigned int where)
220 {
221 unsigned long val;
222
223 /*
224 * LSI_CTL has target PID @ 14
225 */
226 val = io7->csrs->PO7_LSI_CTL[which].csr;
227 val &= ~(0x1ffUL << 14); /* clear the target pid */
228 val |= ((unsigned long)where << 14); /* set the new target pid */
229
230 io7->csrs->PO7_LSI_CTL[which].csr = val;
231 mb();
232 io7->csrs->PO7_LSI_CTL[which].csr;
233 }
234
235 static void
236 io7_redirect_one_msi(struct io7 *io7, unsigned int which, unsigned int where)
237 {
238 unsigned long val;
239
240 /*
241 * MSI_CTL has target PID @ 14
242 */
243 val = io7->csrs->PO7_MSI_CTL[which].csr;
244 val &= ~(0x1ffUL << 14); /* clear the target pid */
245 val |= ((unsigned long)where << 14); /* set the new target pid */
246
247 io7->csrs->PO7_MSI_CTL[which].csr = val;
248 mb();
249 io7->csrs->PO7_MSI_CTL[which].csr;
250 }
251
252 static void __init
253 init_one_io7_lsi(struct io7 *io7, unsigned int which, unsigned int where)
254 {
255 /*
256 * LSI_CTL has target PID @ 14
257 */
258 io7->csrs->PO7_LSI_CTL[which].csr = ((unsigned long)where << 14);
259 mb();
260 io7->csrs->PO7_LSI_CTL[which].csr;
261 }
262
263 static void __init
264 init_one_io7_msi(struct io7 *io7, unsigned int which, unsigned int where)
265 {
266 /*
267 * MSI_CTL has target PID @ 14
268 */
269 io7->csrs->PO7_MSI_CTL[which].csr = ((unsigned long)where << 14);
270 mb();
271 io7->csrs->PO7_MSI_CTL[which].csr;
272 }
273
274 static void __init
275 init_io7_irqs(struct io7 *io7,
276 struct irq_chip *lsi_ops,
277 struct irq_chip *msi_ops)
278 {
279 long base = (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT) + 16;
280 long i;
281
282 printk("Initializing interrupts for IO7 at PE %u - base %lx\n",
283 io7->pe, base);
284
285 /*
286 * Where should interrupts from this IO7 go?
287 *
288 * They really should be sent to the local CPU to avoid having to
289 * traverse the mesh, but if it's not an SMP kernel, they have to
290 * go to the boot CPU. Send them all to the boot CPU for now,
291 * as each secondary starts, it can redirect it's local device
292 * interrupts.
293 */
294 printk(" Interrupts reported to CPU at PE %u\n", boot_cpuid);
295
296 spin_lock(&io7->irq_lock);
297
298 /* set up the error irqs */
299 io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, boot_cpuid);
300 io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, boot_cpuid);
301 io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, boot_cpuid);
302 io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, boot_cpuid);
303 io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, boot_cpuid);
304
305 /* Set up the lsi irqs. */
306 for (i = 0; i < 128; ++i) {
307 irq_desc[base + i].status = IRQ_DISABLED | IRQ_LEVEL;
308 irq_desc[base + i].chip = lsi_ops;
309 }
310
311 /* Disable the implemented irqs in hardware. */
312 for (i = 0; i < 0x60; ++i)
313 init_one_io7_lsi(io7, i, boot_cpuid);
314
315 init_one_io7_lsi(io7, 0x74, boot_cpuid);
316 init_one_io7_lsi(io7, 0x75, boot_cpuid);
317
318
319 /* Set up the msi irqs. */
320 for (i = 128; i < (128 + 512); ++i) {
321 irq_desc[base + i].status = IRQ_DISABLED | IRQ_LEVEL;
322 irq_desc[base + i].chip = msi_ops;
323 }
324
325 for (i = 0; i < 16; ++i)
326 init_one_io7_msi(io7, i, boot_cpuid);
327
328 spin_unlock(&io7->irq_lock);
329 }
330
331 static void __init
332 marvel_init_irq(void)
333 {
334 int i;
335 struct io7 *io7 = NULL;
336
337 /* Reserve the legacy irqs. */
338 for (i = 0; i < 16; ++i) {
339 irq_desc[i].status = IRQ_DISABLED;
340 irq_desc[i].chip = &marvel_legacy_irq_type;
341 }
342
343 /* Init the io7 irqs. */
344 for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )
345 init_io7_irqs(io7, &io7_lsi_irq_type, &io7_msi_irq_type);
346 }
347
348 static int
349 marvel_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
350 {
351 struct pci_controller *hose = dev->sysdata;
352 struct io7_port *io7_port = hose->sysdata;
353 struct io7 *io7 = io7_port->io7;
354 int msi_loc, msi_data_off;
355 u16 msg_ctl;
356 u16 msg_dat;
357 u8 intline;
358 int irq;
359
360 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
361 irq = intline;
362
363 msi_loc = pci_find_capability(dev, PCI_CAP_ID_MSI);
364 msg_ctl = 0;
365 if (msi_loc)
366 pci_read_config_word(dev, msi_loc + PCI_MSI_FLAGS, &msg_ctl);
367
368 if (msg_ctl & PCI_MSI_FLAGS_ENABLE) {
369 msi_data_off = PCI_MSI_DATA_32;
370 if (msg_ctl & PCI_MSI_FLAGS_64BIT)
371 msi_data_off = PCI_MSI_DATA_64;
372 pci_read_config_word(dev, msi_loc + msi_data_off, &msg_dat);
373
374 irq = msg_dat & 0x1ff; /* we use msg_data<8:0> */
375 irq += 0x80; /* offset for lsi */
376
377 #if 1
378 printk("PCI:%d:%d:%d (hose %d) is using MSI\n",
379 dev->bus->number,
380 PCI_SLOT(dev->devfn),
381 PCI_FUNC(dev->devfn),
382 hose->index);
383 printk(" %d message(s) from 0x%04x\n",
384 1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),
385 msg_dat);
386 printk(" reporting on %d IRQ(s) from %d (0x%x)\n",
387 1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),
388 (irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT),
389 (irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT));
390 #endif
391
392 #if 0
393 pci_write_config_word(dev, msi_loc + PCI_MSI_FLAGS,
394 msg_ctl & ~PCI_MSI_FLAGS_ENABLE);
395 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
396 irq = intline;
397
398 printk(" forcing LSI interrupt on irq %d [0x%x]\n", irq, irq);
399 #endif
400 }
401
402 irq += 16; /* offset for legacy */
403 irq |= io7->pe << MARVEL_IRQ_VEC_PE_SHIFT; /* merge the pid */
404
405 return irq;
406 }
407
408 static void __init
409 marvel_init_pci(void)
410 {
411 struct io7 *io7;
412
413 marvel_register_error_handlers();
414
415 pci_probe_only = 1;
416 common_init_pci();
417 locate_and_init_vga(NULL);
418
419 /* Clear any io7 errors. */
420 for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )
421 io7_clear_errors(io7);
422 }
423
424 static void __init
425 marvel_init_rtc(void)
426 {
427 init_rtc_irq();
428 }
429
430 struct marvel_rtc_time {
431 struct rtc_time *time;
432 int retval;
433 };
434
435 #ifdef CONFIG_SMP
436 static void
437 smp_get_rtc_time(void *data)
438 {
439 struct marvel_rtc_time *mrt = data;
440 mrt->retval = __get_rtc_time(mrt->time);
441 }
442
443 static void
444 smp_set_rtc_time(void *data)
445 {
446 struct marvel_rtc_time *mrt = data;
447 mrt->retval = __set_rtc_time(mrt->time);
448 }
449 #endif
450
451 static unsigned int
452 marvel_get_rtc_time(struct rtc_time *time)
453 {
454 #ifdef CONFIG_SMP
455 struct marvel_rtc_time mrt;
456
457 if (smp_processor_id() != boot_cpuid) {
458 mrt.time = time;
459 smp_call_function_single(boot_cpuid, smp_get_rtc_time, &mrt, 1);
460 return mrt.retval;
461 }
462 #endif
463 return __get_rtc_time(time);
464 }
465
466 static int
467 marvel_set_rtc_time(struct rtc_time *time)
468 {
469 #ifdef CONFIG_SMP
470 struct marvel_rtc_time mrt;
471
472 if (smp_processor_id() != boot_cpuid) {
473 mrt.time = time;
474 smp_call_function_single(boot_cpuid, smp_set_rtc_time, &mrt, 1);
475 return mrt.retval;
476 }
477 #endif
478 return __set_rtc_time(time);
479 }
480
481 static void
482 marvel_smp_callin(void)
483 {
484 int cpuid = hard_smp_processor_id();
485 struct io7 *io7 = marvel_find_io7(cpuid);
486 unsigned int i;
487
488 if (!io7)
489 return;
490
491 /*
492 * There is a local IO7 - redirect all of its interrupts here.
493 */
494 printk("Redirecting IO7 interrupts to local CPU at PE %u\n", cpuid);
495
496 /* Redirect the error IRQS here. */
497 io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, cpuid);
498 io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, cpuid);
499 io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, cpuid);
500 io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, cpuid);
501 io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, cpuid);
502
503 /* Redirect the implemented LSIs here. */
504 for (i = 0; i < 0x60; ++i)
505 io7_redirect_one_lsi(io7, i, cpuid);
506
507 io7_redirect_one_lsi(io7, 0x74, cpuid);
508 io7_redirect_one_lsi(io7, 0x75, cpuid);
509
510 /* Redirect the MSIs here. */
511 for (i = 0; i < 16; ++i)
512 io7_redirect_one_msi(io7, i, cpuid);
513 }
514 \f
515 /*
516 * System Vectors
517 */
518 struct alpha_machine_vector marvel_ev7_mv __initmv = {
519 .vector_name = "MARVEL/EV7",
520 DO_EV7_MMU,
521 .rtc_port = 0x70,
522 .rtc_get_time = marvel_get_rtc_time,
523 .rtc_set_time = marvel_set_rtc_time,
524 DO_MARVEL_IO,
525 .machine_check = marvel_machine_check,
526 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
527 .min_io_address = DEFAULT_IO_BASE,
528 .min_mem_address = DEFAULT_MEM_BASE,
529 .pci_dac_offset = IO7_DAC_OFFSET,
530
531 .nr_irqs = MARVEL_NR_IRQS,
532 .device_interrupt = io7_device_interrupt,
533
534 .agp_info = marvel_agp_info,
535
536 .smp_callin = marvel_smp_callin,
537 .init_arch = marvel_init_arch,
538 .init_irq = marvel_init_irq,
539 .init_rtc = marvel_init_rtc,
540 .init_pci = marvel_init_pci,
541 .kill_arch = marvel_kill_arch,
542 .pci_map_irq = marvel_map_irq,
543 .pci_swizzle = common_swizzle,
544
545 .pa_to_nid = marvel_pa_to_nid,
546 .cpuid_to_nid = marvel_cpuid_to_nid,
547 .node_mem_start = marvel_node_mem_start,
548 .node_mem_size = marvel_node_mem_size,
549 };
550 ALIAS_MV(marvel_ev7)
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