xref: /openbmc/linux/arch/alpha/kernel/sys_marvel.c (revision e23feb16) 
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/dma.h>
17 #include <asm/irq.h>
18 #include <asm/mmu_context.h>
19 #include <asm/io.h>
20 #include <asm/pgtable.h>
21 #include <asm/core_marvel.h>
22 #include <asm/hwrpb.h>
23 #include <asm/tlbflush.h>
24 #include <asm/vga.h>
25 #include <asm/rtc.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 
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(struct irq_data *d)
107 {
108 	volatile unsigned long *ctl;
109 	unsigned int irq = d->irq;
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(struct irq_data *d)
128 {
129 	volatile unsigned long *ctl;
130 	unsigned int irq = d->irq;
131 	struct io7 *io7;
132 
133 	ctl = io7_get_irq_ctl(irq, &io7);
134 	if (!ctl || !io7) {
135 		printk(KERN_ERR "%s: get_ctl failed for irq %x\n",
136 		       __func__, irq);
137 		return;
138 	}
139 
140 	spin_lock(&io7->irq_lock);
141 	*ctl &= ~(1UL << 24);
142 	mb();
143 	*ctl;
144 	spin_unlock(&io7->irq_lock);
145 }
146 
147 static void
148 marvel_irq_noop(struct irq_data *d)
149 {
150 	return;
151 }
152 
153 static struct irq_chip marvel_legacy_irq_type = {
154 	.name		= "LEGACY",
155 	.irq_mask	= marvel_irq_noop,
156 	.irq_unmask	= marvel_irq_noop,
157 };
158 
159 static struct irq_chip io7_lsi_irq_type = {
160 	.name		= "LSI",
161 	.irq_unmask	= io7_enable_irq,
162 	.irq_mask	= io7_disable_irq,
163 	.irq_mask_ack	= io7_disable_irq,
164 };
165 
166 static struct irq_chip io7_msi_irq_type = {
167 	.name		= "MSI",
168 	.irq_unmask	= io7_enable_irq,
169 	.irq_mask	= io7_disable_irq,
170 	.irq_ack	= marvel_irq_noop,
171 };
172 
173 static void
174 io7_redirect_irq(struct io7 *io7,
175 		 volatile unsigned long *csr,
176 		 unsigned int where)
177 {
178 	unsigned long val;
179 
180 	val = *csr;
181 	val &= ~(0x1ffUL << 24);		/* clear the target pid   */
182 	val |= ((unsigned long)where << 24);	/* set the new target pid */
183 
184 	*csr = val;
185 	mb();
186 	*csr;
187 }
188 
189 static void
190 io7_redirect_one_lsi(struct io7 *io7, unsigned int which, unsigned int where)
191 {
192 	unsigned long val;
193 
194 	/*
195 	 * LSI_CTL has target PID @ 14
196 	 */
197 	val = io7->csrs->PO7_LSI_CTL[which].csr;
198 	val &= ~(0x1ffUL << 14);		/* clear the target pid */
199 	val |= ((unsigned long)where << 14);	/* set the new target pid */
200 
201 	io7->csrs->PO7_LSI_CTL[which].csr = val;
202 	mb();
203 	io7->csrs->PO7_LSI_CTL[which].csr;
204 }
205 
206 static void
207 io7_redirect_one_msi(struct io7 *io7, unsigned int which, unsigned int where)
208 {
209 	unsigned long val;
210 
211 	/*
212 	 * MSI_CTL has target PID @ 14
213 	 */
214 	val = io7->csrs->PO7_MSI_CTL[which].csr;
215 	val &= ~(0x1ffUL << 14);		/* clear the target pid */
216 	val |= ((unsigned long)where << 14);	/* set the new target pid */
217 
218 	io7->csrs->PO7_MSI_CTL[which].csr = val;
219 	mb();
220 	io7->csrs->PO7_MSI_CTL[which].csr;
221 }
222 
223 static void __init
224 init_one_io7_lsi(struct io7 *io7, unsigned int which, unsigned int where)
225 {
226 	/*
227 	 * LSI_CTL has target PID @ 14
228 	 */
229 	io7->csrs->PO7_LSI_CTL[which].csr = ((unsigned long)where << 14);
230 	mb();
231 	io7->csrs->PO7_LSI_CTL[which].csr;
232 }
233 
234 static void __init
235 init_one_io7_msi(struct io7 *io7, unsigned int which, unsigned int where)
236 {
237 	/*
238 	 * MSI_CTL has target PID @ 14
239 	 */
240 	io7->csrs->PO7_MSI_CTL[which].csr = ((unsigned long)where << 14);
241 	mb();
242 	io7->csrs->PO7_MSI_CTL[which].csr;
243 }
244 
245 static void __init
246 init_io7_irqs(struct io7 *io7,
247 	      struct irq_chip *lsi_ops,
248 	      struct irq_chip *msi_ops)
249 {
250 	long base = (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT) + 16;
251 	long i;
252 
253 	printk("Initializing interrupts for IO7 at PE %u - base %lx\n",
254 		io7->pe, base);
255 
256 	/*
257 	 * Where should interrupts from this IO7 go?
258 	 *
259 	 * They really should be sent to the local CPU to avoid having to
260 	 * traverse the mesh, but if it's not an SMP kernel, they have to
261 	 * go to the boot CPU. Send them all to the boot CPU for now,
262 	 * as each secondary starts, it can redirect it's local device
263 	 * interrupts.
264 	 */
265 	printk("  Interrupts reported to CPU at PE %u\n", boot_cpuid);
266 
267 	spin_lock(&io7->irq_lock);
268 
269 	/* set up the error irqs */
270 	io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, boot_cpuid);
271 	io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, boot_cpuid);
272 	io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, boot_cpuid);
273 	io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, boot_cpuid);
274 	io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, boot_cpuid);
275 
276 	/* Set up the lsi irqs.  */
277 	for (i = 0; i < 128; ++i) {
278 		irq_set_chip_and_handler(base + i, lsi_ops, handle_level_irq);
279 		irq_set_status_flags(i, IRQ_LEVEL);
280 	}
281 
282 	/* Disable the implemented irqs in hardware.  */
283 	for (i = 0; i < 0x60; ++i)
284 		init_one_io7_lsi(io7, i, boot_cpuid);
285 
286 	init_one_io7_lsi(io7, 0x74, boot_cpuid);
287 	init_one_io7_lsi(io7, 0x75, boot_cpuid);
288 
289 
290 	/* Set up the msi irqs.  */
291 	for (i = 128; i < (128 + 512); ++i) {
292 		irq_set_chip_and_handler(base + i, msi_ops, handle_level_irq);
293 		irq_set_status_flags(i, IRQ_LEVEL);
294 	}
295 
296 	for (i = 0; i < 16; ++i)
297 		init_one_io7_msi(io7, i, boot_cpuid);
298 
299 	spin_unlock(&io7->irq_lock);
300 }
301 
302 static void __init
303 marvel_init_irq(void)
304 {
305 	int i;
306 	struct io7 *io7 = NULL;
307 
308 	/* Reserve the legacy irqs.  */
309 	for (i = 0; i < 16; ++i) {
310 		irq_set_chip_and_handler(i, &marvel_legacy_irq_type,
311 					 handle_level_irq);
312 	}
313 
314 	/* Init the io7 irqs.  */
315 	for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )
316 		init_io7_irqs(io7, &io7_lsi_irq_type, &io7_msi_irq_type);
317 }
318 
319 static int
320 marvel_map_irq(const struct pci_dev *cdev, u8 slot, u8 pin)
321 {
322 	struct pci_dev *dev = (struct pci_dev *)cdev;
323 	struct pci_controller *hose = dev->sysdata;
324 	struct io7_port *io7_port = hose->sysdata;
325 	struct io7 *io7 = io7_port->io7;
326 	int msi_loc, msi_data_off;
327 	u16 msg_ctl;
328 	u16 msg_dat;
329 	u8 intline;
330 	int irq;
331 
332 	pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
333 	irq = intline;
334 
335 	msi_loc = pci_find_capability(dev, PCI_CAP_ID_MSI);
336 	msg_ctl = 0;
337 	if (msi_loc)
338 		pci_read_config_word(dev, msi_loc + PCI_MSI_FLAGS, &msg_ctl);
339 
340 	if (msg_ctl & PCI_MSI_FLAGS_ENABLE) {
341  		msi_data_off = PCI_MSI_DATA_32;
342 		if (msg_ctl & PCI_MSI_FLAGS_64BIT)
343 			msi_data_off = PCI_MSI_DATA_64;
344 		pci_read_config_word(dev, msi_loc + msi_data_off, &msg_dat);
345 
346 		irq = msg_dat & 0x1ff;		/* we use msg_data<8:0> */
347 		irq += 0x80;			/* offset for lsi       */
348 
349 #if 1
350 		printk("PCI:%d:%d:%d (hose %d) is using MSI\n",
351 		       dev->bus->number,
352 		       PCI_SLOT(dev->devfn),
353 		       PCI_FUNC(dev->devfn),
354 		       hose->index);
355 		printk("  %d message(s) from 0x%04x\n",
356 		       1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),
357 		       msg_dat);
358 		printk("  reporting on %d IRQ(s) from %d (0x%x)\n",
359 		       1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),
360 		       (irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT),
361 		       (irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT));
362 #endif
363 
364 #if 0
365 		pci_write_config_word(dev, msi_loc + PCI_MSI_FLAGS,
366 				      msg_ctl & ~PCI_MSI_FLAGS_ENABLE);
367 		pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
368 		irq = intline;
369 
370 		printk("  forcing LSI interrupt on irq %d [0x%x]\n", irq, irq);
371 #endif
372 	}
373 
374 	irq += 16;					/* offset for legacy */
375 	irq |= io7->pe << MARVEL_IRQ_VEC_PE_SHIFT;	/* merge the pid     */
376 
377 	return irq;
378 }
379 
380 static void __init
381 marvel_init_pci(void)
382 {
383 	struct io7 *io7;
384 
385 	marvel_register_error_handlers();
386 
387 	/* Indicate that we trust the console to configure things properly */
388 	pci_set_flags(PCI_PROBE_ONLY);
389 	common_init_pci();
390 	locate_and_init_vga(NULL);
391 
392 	/* Clear any io7 errors.  */
393 	for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )
394 		io7_clear_errors(io7);
395 }
396 
397 static void __init
398 marvel_init_rtc(void)
399 {
400 	init_rtc_irq();
401 }
402 
403 struct marvel_rtc_time {
404 	struct rtc_time *time;
405 	int retval;
406 };
407 
408 #ifdef CONFIG_SMP
409 static void
410 smp_get_rtc_time(void *data)
411 {
412 	struct marvel_rtc_time *mrt = data;
413 	mrt->retval = __get_rtc_time(mrt->time);
414 }
415 
416 static void
417 smp_set_rtc_time(void *data)
418 {
419 	struct marvel_rtc_time *mrt = data;
420 	mrt->retval = __set_rtc_time(mrt->time);
421 }
422 #endif
423 
424 static unsigned int
425 marvel_get_rtc_time(struct rtc_time *time)
426 {
427 #ifdef CONFIG_SMP
428 	struct marvel_rtc_time mrt;
429 
430 	if (smp_processor_id() != boot_cpuid) {
431 		mrt.time = time;
432 		smp_call_function_single(boot_cpuid, smp_get_rtc_time, &mrt, 1);
433 		return mrt.retval;
434 	}
435 #endif
436 	return __get_rtc_time(time);
437 }
438 
439 static int
440 marvel_set_rtc_time(struct rtc_time *time)
441 {
442 #ifdef CONFIG_SMP
443 	struct marvel_rtc_time mrt;
444 
445 	if (smp_processor_id() != boot_cpuid) {
446 		mrt.time = time;
447 		smp_call_function_single(boot_cpuid, smp_set_rtc_time, &mrt, 1);
448 		return mrt.retval;
449 	}
450 #endif
451 	return __set_rtc_time(time);
452 }
453 
454 static void
455 marvel_smp_callin(void)
456 {
457 	int cpuid = hard_smp_processor_id();
458 	struct io7 *io7 = marvel_find_io7(cpuid);
459 	unsigned int i;
460 
461 	if (!io7)
462 		return;
463 
464 	/*
465 	 * There is a local IO7 - redirect all of its interrupts here.
466 	 */
467 	printk("Redirecting IO7 interrupts to local CPU at PE %u\n", cpuid);
468 
469 	/* Redirect the error IRQS here.  */
470 	io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, cpuid);
471 	io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, cpuid);
472 	io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, cpuid);
473 	io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, cpuid);
474 	io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, cpuid);
475 
476 	/* Redirect the implemented LSIs here.  */
477 	for (i = 0; i < 0x60; ++i)
478 		io7_redirect_one_lsi(io7, i, cpuid);
479 
480 	io7_redirect_one_lsi(io7, 0x74, cpuid);
481 	io7_redirect_one_lsi(io7, 0x75, cpuid);
482 
483 	/* Redirect the MSIs here.  */
484 	for (i = 0; i < 16; ++i)
485 		io7_redirect_one_msi(io7, i, cpuid);
486 }
487 
488 /*
489  * System Vectors
490  */
491 struct alpha_machine_vector marvel_ev7_mv __initmv = {
492 	.vector_name		= "MARVEL/EV7",
493 	DO_EV7_MMU,
494 	.rtc_port		= 0x70,
495 	.rtc_get_time		= marvel_get_rtc_time,
496 	.rtc_set_time		= marvel_set_rtc_time,
497 	DO_MARVEL_IO,
498 	.machine_check		= marvel_machine_check,
499 	.max_isa_dma_address	= ALPHA_MAX_ISA_DMA_ADDRESS,
500 	.min_io_address		= DEFAULT_IO_BASE,
501 	.min_mem_address	= DEFAULT_MEM_BASE,
502 	.pci_dac_offset		= IO7_DAC_OFFSET,
503 
504 	.nr_irqs		= MARVEL_NR_IRQS,
505 	.device_interrupt	= io7_device_interrupt,
506 
507 	.agp_info		= marvel_agp_info,
508 
509 	.smp_callin		= marvel_smp_callin,
510 	.init_arch		= marvel_init_arch,
511 	.init_irq		= marvel_init_irq,
512 	.init_rtc		= marvel_init_rtc,
513 	.init_pci		= marvel_init_pci,
514 	.kill_arch		= marvel_kill_arch,
515 	.pci_map_irq		= marvel_map_irq,
516 	.pci_swizzle		= common_swizzle,
517 
518 	.pa_to_nid		= marvel_pa_to_nid,
519 	.cpuid_to_nid		= marvel_cpuid_to_nid,
520 	.node_mem_start		= marvel_node_mem_start,
521 	.node_mem_size		= marvel_node_mem_size,
522 };
523 ALIAS_MV(marvel_ev7)
524