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airport: remove useless return in a function returning void
[linux/fpc-iii.git] / arch / alpha / kernel / sys_marvel.c
blob828449cd263687c18bc278358a8e8e2c8c8a01be
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
27 #include "proto.h"
28 #include "err_impl.h"
29 #include "irq_impl.h"
30 #include "pci_impl.h"
31 #include "machvec_impl.h"
32
33 #if NR_IRQS < MARVEL_NR_IRQS
34 # error NR_IRQS < MARVEL_NR_IRQS !!!
35 #endif
36
37 \f
38 /*
39 * Interrupt handling.
40 */
41 static void
42 io7_device_interrupt(unsigned long vector)
43 {
44 unsigned int pid;
45 unsigned int irq;
46
47 /*
48 * Vector is 0x800 + (interrupt)
49 *
50 * where (interrupt) is:
51 *
52 * ...16|15 14|13 4|3 0
53 * -----+-----+--------+---
54 * PE | 0 | irq | 0
55 *
56 * where (irq) is
57 *
58 * 0x0800 - 0x0ff0 - 0x0800 + (LSI id << 4)
59 * 0x1000 - 0x2ff0 - 0x1000 + (MSI_DAT<8:0> << 4)
60 */
61 pid = vector >> 16;
62 irq = ((vector & 0xffff) - 0x800) >> 4;
63
64 irq += 16; /* offset for legacy */
65 irq &= MARVEL_IRQ_VEC_IRQ_MASK; /* not too many bits */
66 irq |= pid << MARVEL_IRQ_VEC_PE_SHIFT; /* merge the pid */
67
68 handle_irq(irq);
69 }
70
71 static volatile unsigned long *
72 io7_get_irq_ctl(unsigned int irq, struct io7 **pio7)
73 {
74 volatile unsigned long *ctl;
75 unsigned int pid;
76 struct io7 *io7;
77
78 pid = irq >> MARVEL_IRQ_VEC_PE_SHIFT;
79
80 if (!(io7 = marvel_find_io7(pid))) {
81 printk(KERN_ERR
82 "%s for nonexistent io7 -- vec %x, pid %d\n",
83 __func__, irq, pid);
84 return NULL;
85 }
86
87 irq &= MARVEL_IRQ_VEC_IRQ_MASK; /* isolate the vector */
88 irq -= 16; /* subtract legacy bias */
89
90 if (irq >= 0x180) {
91 printk(KERN_ERR
92 "%s for invalid irq -- pid %d adjusted irq %x\n",
93 __func__, pid, irq);
94 return NULL;
95 }
96
97 ctl = &io7->csrs->PO7_LSI_CTL[irq & 0xff].csr; /* assume LSI */
98 if (irq >= 0x80) /* MSI */
99 ctl = &io7->csrs->PO7_MSI_CTL[((irq - 0x80) >> 5) & 0x0f].csr;
100
101 if (pio7) *pio7 = io7;
102 return ctl;
103 }
104
105 static void
106 io7_enable_irq(unsigned int irq)
107 {
108 volatile unsigned long *ctl;
109 struct io7 *io7;
110
111 ctl = io7_get_irq_ctl(irq, &io7);
112 if (!ctl || !io7) {
113 printk(KERN_ERR "%s: get_ctl failed for irq %x\n",
114 __func__, irq);
115 return;
116 }
117
118 spin_lock(&io7->irq_lock);
119 *ctl |= 1UL << 24;
120 mb();
121 *ctl;
122 spin_unlock(&io7->irq_lock);
123 }
124
125 static void
126 io7_disable_irq(unsigned int irq)
127 {
128 volatile unsigned long *ctl;
129 struct io7 *io7;
130
131 ctl = io7_get_irq_ctl(irq, &io7);
132 if (!ctl || !io7) {
133 printk(KERN_ERR "%s: get_ctl failed for irq %x\n",
134 __func__, irq);
135 return;
136 }
137
138 spin_lock(&io7->irq_lock);
139 *ctl &= ~(1UL << 24);
140 mb();
141 *ctl;
142 spin_unlock(&io7->irq_lock);
143 }
144
145 static unsigned int
146 io7_startup_irq(unsigned int irq)
147 {
148 io7_enable_irq(irq);
149 return 0; /* never anything pending */
150 }
151
152 static void
153 io7_end_irq(unsigned int irq)
154 {
155 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
156 io7_enable_irq(irq);
157 }
158
159 static void
160 marvel_irq_noop(unsigned int irq)
161 {
162 return;
163 }
164
165 static unsigned int
166 marvel_irq_noop_return(unsigned int irq)
167 {
168 return 0;
169 }
170
171 static struct hw_interrupt_type marvel_legacy_irq_type = {
172 .typename = "LEGACY",
173 .startup = marvel_irq_noop_return,
174 .shutdown = marvel_irq_noop,
175 .enable = marvel_irq_noop,
176 .disable = marvel_irq_noop,
177 .ack = marvel_irq_noop,
178 .end = marvel_irq_noop,
179 };
180
181 static struct hw_interrupt_type io7_lsi_irq_type = {
182 .typename = "LSI",
183 .startup = io7_startup_irq,
184 .shutdown = io7_disable_irq,
185 .enable = io7_enable_irq,
186 .disable = io7_disable_irq,
187 .ack = io7_disable_irq,
188 .end = io7_end_irq,
189 };
190
191 static struct hw_interrupt_type io7_msi_irq_type = {
192 .typename = "MSI",
193 .startup = io7_startup_irq,
194 .shutdown = io7_disable_irq,
195 .enable = io7_enable_irq,
196 .disable = io7_disable_irq,
197 .ack = marvel_irq_noop,
198 .end = io7_end_irq,
199 };
200
201 static void
202 io7_redirect_irq(struct io7 *io7,
203 volatile unsigned long *csr,
204 unsigned int where)
205 {
206 unsigned long val;
207
208 val = *csr;
209 val &= ~(0x1ffUL << 24); /* clear the target pid */
210 val |= ((unsigned long)where << 24); /* set the new target pid */
211
212 *csr = val;
213 mb();
214 *csr;
215 }
216
217 static void
218 io7_redirect_one_lsi(struct io7 *io7, unsigned int which, unsigned int where)
219 {
220 unsigned long val;
221
222 /*
223 * LSI_CTL has target PID @ 14
224 */
225 val = io7->csrs->PO7_LSI_CTL[which].csr;
226 val &= ~(0x1ffUL << 14); /* clear the target pid */
227 val |= ((unsigned long)where << 14); /* set the new target pid */
228
229 io7->csrs->PO7_LSI_CTL[which].csr = val;
230 mb();
231 io7->csrs->PO7_LSI_CTL[which].csr;
232 }
233
234 static void
235 io7_redirect_one_msi(struct io7 *io7, unsigned int which, unsigned int where)
236 {
237 unsigned long val;
238
239 /*
240 * MSI_CTL has target PID @ 14
241 */
242 val = io7->csrs->PO7_MSI_CTL[which].csr;
243 val &= ~(0x1ffUL << 14); /* clear the target pid */
244 val |= ((unsigned long)where << 14); /* set the new target pid */
245
246 io7->csrs->PO7_MSI_CTL[which].csr = val;
247 mb();
248 io7->csrs->PO7_MSI_CTL[which].csr;
249 }
250
251 static void __init
252 init_one_io7_lsi(struct io7 *io7, unsigned int which, unsigned int where)
253 {
254 /*
255 * LSI_CTL has target PID @ 14
256 */
257 io7->csrs->PO7_LSI_CTL[which].csr = ((unsigned long)where << 14);
258 mb();
259 io7->csrs->PO7_LSI_CTL[which].csr;
260 }
261
262 static void __init
263 init_one_io7_msi(struct io7 *io7, unsigned int which, unsigned int where)
264 {
265 /*
266 * MSI_CTL has target PID @ 14
267 */
268 io7->csrs->PO7_MSI_CTL[which].csr = ((unsigned long)where << 14);
269 mb();
270 io7->csrs->PO7_MSI_CTL[which].csr;
271 }
272
273 static void __init
274 init_io7_irqs(struct io7 *io7,
275 struct hw_interrupt_type *lsi_ops,
276 struct hw_interrupt_type *msi_ops)
277 {
278 long base = (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT) + 16;
279 long i;
280
281 printk("Initializing interrupts for IO7 at PE %u - base %lx\n",
282 io7->pe, base);
283
284 /*
285 * Where should interrupts from this IO7 go?
286 *
287 * They really should be sent to the local CPU to avoid having to
288 * traverse the mesh, but if it's not an SMP kernel, they have to
289 * go to the boot CPU. Send them all to the boot CPU for now,
290 * as each secondary starts, it can redirect it's local device
291 * interrupts.
292 */
293 printk(" Interrupts reported to CPU at PE %u\n", boot_cpuid);
294
295 spin_lock(&io7->irq_lock);
296
297 /* set up the error irqs */
298 io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, boot_cpuid);
299 io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, boot_cpuid);
300 io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, boot_cpuid);
301 io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, boot_cpuid);
302 io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, boot_cpuid);
303
304 /* Set up the lsi irqs. */
305 for (i = 0; i < 128; ++i) {
306 irq_desc[base + i].status = IRQ_DISABLED | IRQ_LEVEL;
307 irq_desc[base + i].chip = lsi_ops;
308 }
309
310 /* Disable the implemented irqs in hardware. */
311 for (i = 0; i < 0x60; ++i)
312 init_one_io7_lsi(io7, i, boot_cpuid);
313
314 init_one_io7_lsi(io7, 0x74, boot_cpuid);
315 init_one_io7_lsi(io7, 0x75, boot_cpuid);
316
317
318 /* Set up the msi irqs. */
319 for (i = 128; i < (128 + 512); ++i) {
320 irq_desc[base + i].status = IRQ_DISABLED | IRQ_LEVEL;
321 irq_desc[base + i].chip = msi_ops;
322 }
323
324 for (i = 0; i < 16; ++i)
325 init_one_io7_msi(io7, i, boot_cpuid);
326
327 spin_unlock(&io7->irq_lock);
328 }
329
330 static void __init
331 marvel_init_irq(void)
332 {
333 int i;
334 struct io7 *io7 = NULL;
335
336 /* Reserve the legacy irqs. */
337 for (i = 0; i < 16; ++i) {
338 irq_desc[i].status = IRQ_DISABLED;
339 irq_desc[i].chip = &marvel_legacy_irq_type;
340 }
341
342 /* Init the io7 irqs. */
343 for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )
344 init_io7_irqs(io7, &io7_lsi_irq_type, &io7_msi_irq_type);
345 }
346
347 static int
348 marvel_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
349 {
350 struct pci_controller *hose = dev->sysdata;
351 struct io7_port *io7_port = hose->sysdata;
352 struct io7 *io7 = io7_port->io7;
353 int msi_loc, msi_data_off;
354 u16 msg_ctl;
355 u16 msg_dat;
356 u8 intline;
357 int irq;
358
359 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
360 irq = intline;
361
362 msi_loc = pci_find_capability(dev, PCI_CAP_ID_MSI);
363 msg_ctl = 0;
364 if (msi_loc)
365 pci_read_config_word(dev, msi_loc + PCI_MSI_FLAGS, &msg_ctl);
366
367 if (msg_ctl & PCI_MSI_FLAGS_ENABLE) {
368 msi_data_off = PCI_MSI_DATA_32;
369 if (msg_ctl & PCI_MSI_FLAGS_64BIT)
370 msi_data_off = PCI_MSI_DATA_64;
371 pci_read_config_word(dev, msi_loc + msi_data_off, &msg_dat);
372
373 irq = msg_dat & 0x1ff; /* we use msg_data<8:0> */
374 irq += 0x80; /* offset for lsi */
375
376 #if 1
377 printk("PCI:%d:%d:%d (hose %d) is using MSI\n",
378 dev->bus->number,
379 PCI_SLOT(dev->devfn),
380 PCI_FUNC(dev->devfn),
381 hose->index);
382 printk(" %d message(s) from 0x%04x\n",
383 1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),
384 msg_dat);
385 printk(" reporting on %d IRQ(s) from %d (0x%x)\n",
386 1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),
387 (irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT),
388 (irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT));
389 #endif
390
391 #if 0
392 pci_write_config_word(dev, msi_loc + PCI_MSI_FLAGS,
393 msg_ctl & ~PCI_MSI_FLAGS_ENABLE);
394 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
395 irq = intline;
396
397 printk(" forcing LSI interrupt on irq %d [0x%x]\n", irq, irq);
398 #endif
399 }
400
401 irq += 16; /* offset for legacy */
402 irq |= io7->pe << MARVEL_IRQ_VEC_PE_SHIFT; /* merge the pid */
403
404 return irq;
405 }
406
407 static void __init
408 marvel_init_pci(void)
409 {
410 struct io7 *io7;
411
412 marvel_register_error_handlers();
413
414 pci_probe_only = 1;
415 common_init_pci();
416 locate_and_init_vga(NULL);
417
418 /* Clear any io7 errors. */
419 for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )
420 io7_clear_errors(io7);
421 }
422
423 static void __init
424 marvel_init_rtc(void)
425 {
426 init_rtc_irq();
427 }
428
429 static void
430 marvel_smp_callin(void)
431 {
432 int cpuid = hard_smp_processor_id();
433 struct io7 *io7 = marvel_find_io7(cpuid);
434 unsigned int i;
435
436 if (!io7)
437 return;
438
439 /*
440 * There is a local IO7 - redirect all of its interrupts here.
441 */
442 printk("Redirecting IO7 interrupts to local CPU at PE %u\n", cpuid);
443
444 /* Redirect the error IRQS here. */
445 io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, cpuid);
446 io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, cpuid);
447 io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, cpuid);
448 io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, cpuid);
449 io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, cpuid);
450
451 /* Redirect the implemented LSIs here. */
452 for (i = 0; i < 0x60; ++i)
453 io7_redirect_one_lsi(io7, i, cpuid);
454
455 io7_redirect_one_lsi(io7, 0x74, cpuid);
456 io7_redirect_one_lsi(io7, 0x75, cpuid);
457
458 /* Redirect the MSIs here. */
459 for (i = 0; i < 16; ++i)
460 io7_redirect_one_msi(io7, i, cpuid);
461 }
462 \f
463 /*
464 * System Vectors
465 */
466 struct alpha_machine_vector marvel_ev7_mv __initmv = {
467 .vector_name = "MARVEL/EV7",
468 DO_EV7_MMU,
469 DO_DEFAULT_RTC,
470 DO_MARVEL_IO,
471 .machine_check = marvel_machine_check,
472 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
473 .min_io_address = DEFAULT_IO_BASE,
474 .min_mem_address = DEFAULT_MEM_BASE,
475 .pci_dac_offset = IO7_DAC_OFFSET,
476
477 .nr_irqs = MARVEL_NR_IRQS,
478 .device_interrupt = io7_device_interrupt,
479
480 .agp_info = marvel_agp_info,
481
482 .smp_callin = marvel_smp_callin,
483 .init_arch = marvel_init_arch,
484 .init_irq = marvel_init_irq,
485 .init_rtc = marvel_init_rtc,
486 .init_pci = marvel_init_pci,
487 .kill_arch = marvel_kill_arch,
488 .pci_map_irq = marvel_map_irq,
489 .pci_swizzle = common_swizzle,
490
491 .pa_to_nid = marvel_pa_to_nid,
492 .cpuid_to_nid = marvel_cpuid_to_nid,
493 .node_mem_start = marvel_node_mem_start,
494 .node_mem_size = marvel_node_mem_size,
495 };
496 ALIAS_MV(marvel_ev7)
Linux with added FPC-III support