1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2003 Christoph Hellwig (hch@lst.de)
4 * Copyright (C) 1999, 2000, 04 Ralf Baechle (ralf@linux-mips.org)
5 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
6 */
7 #include <linux/kernel.h>
8 #include <linux/export.h>
9 #include <linux/pci.h>
10 #include <linux/smp.h>
11 #include <linux/dma-direct.h>
12 #include <linux/platform_device.h>
13 #include <linux/platform_data/xtalk-bridge.h>
14 #include <linux/nvmem-consumer.h>
15 #include <linux/crc16.h>
16 #include <linux/irqdomain.h>
17
18 #include <asm/pci/bridge.h>
19 #include <asm/paccess.h>
20 #include <asm/sn/irq_alloc.h>
21 #include <asm/sn/ioc3.h>
22
23 #define CRC16_INIT 0
24 #define CRC16_VALID 0xb001
25
26 /*
27 * Common phys<->dma mapping for platforms using pci xtalk bridge
28 */
phys_to_dma(struct device * dev,phys_addr_t paddr)29 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
30 {
31 struct pci_dev *pdev = to_pci_dev(dev);
32 struct bridge_controller *bc = BRIDGE_CONTROLLER(pdev->bus);
33
34 return bc->baddr + paddr;
35 }
36
dma_to_phys(struct device * dev,dma_addr_t dma_addr)37 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
38 {
39 return dma_addr & ~(0xffUL << 56);
40 }
41
42 /*
43 * Most of the IOC3 PCI config register aren't present
44 * we emulate what is needed for a normal PCI enumeration
45 */
ioc3_cfg_rd(void * addr,int where,int size,u32 * value,u32 sid)46 static int ioc3_cfg_rd(void *addr, int where, int size, u32 *value, u32 sid)
47 {
48 u32 cf, shift, mask;
49
50 switch (where & ~3) {
51 case 0x00 ... 0x10:
52 case 0x40 ... 0x44:
53 if (get_dbe(cf, (u32 *)addr))
54 return PCIBIOS_DEVICE_NOT_FOUND;
55 break;
56 case 0x2c:
57 cf = sid;
58 break;
59 case 0x3c:
60 /* emulate sane interrupt pin value */
61 cf = 0x00000100;
62 break;
63 default:
64 cf = 0;
65 break;
66 }
67 shift = (where & 3) << 3;
68 mask = 0xffffffffU >> ((4 - size) << 3);
69 *value = (cf >> shift) & mask;
70
71 return PCIBIOS_SUCCESSFUL;
72 }
73
ioc3_cfg_wr(void * addr,int where,int size,u32 value)74 static int ioc3_cfg_wr(void *addr, int where, int size, u32 value)
75 {
76 u32 cf, shift, mask, smask;
77
78 if ((where >= 0x14 && where < 0x40) || (where >= 0x48))
79 return PCIBIOS_SUCCESSFUL;
80
81 if (get_dbe(cf, (u32 *)addr))
82 return PCIBIOS_DEVICE_NOT_FOUND;
83
84 shift = ((where & 3) << 3);
85 mask = (0xffffffffU >> ((4 - size) << 3));
86 smask = mask << shift;
87
88 cf = (cf & ~smask) | ((value & mask) << shift);
89 if (put_dbe(cf, (u32 *)addr))
90 return PCIBIOS_DEVICE_NOT_FOUND;
91
92 return PCIBIOS_SUCCESSFUL;
93 }
94
bridge_disable_swapping(struct pci_dev * dev)95 static void bridge_disable_swapping(struct pci_dev *dev)
96 {
97 struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
98 int slot = PCI_SLOT(dev->devfn);
99
100 /* Turn off byte swapping */
101 bridge_clr(bc, b_device[slot].reg, BRIDGE_DEV_SWAP_DIR);
102 bridge_read(bc, b_widget.w_tflush); /* Flush */
103 }
104
105 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3,
106 bridge_disable_swapping);
107
108
109 /*
110 * The Bridge ASIC supports both type 0 and type 1 access. Type 1 is
111 * not really documented, so right now I can't write code which uses it.
112 * Therefore we use type 0 accesses for now even though they won't work
113 * correctly for PCI-to-PCI bridges.
114 *
115 * The function is complicated by the ultimate brokenness of the IOC3 chip
116 * which is used in SGI systems. The IOC3 can only handle 32-bit PCI
117 * accesses and does only decode parts of it's address space.
118 */
pci_conf0_read_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * value)119 static int pci_conf0_read_config(struct pci_bus *bus, unsigned int devfn,
120 int where, int size, u32 *value)
121 {
122 struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
123 struct bridge_regs *bridge = bc->base;
124 int slot = PCI_SLOT(devfn);
125 int fn = PCI_FUNC(devfn);
126 void *addr;
127 u32 cf;
128 int res;
129
130 addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[PCI_VENDOR_ID];
131 if (get_dbe(cf, (u32 *)addr))
132 return PCIBIOS_DEVICE_NOT_FOUND;
133
134 /*
135 * IOC3 is broken beyond belief ... Don't even give the
136 * generic PCI code a chance to look at it for real ...
137 */
138 if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16))) {
139 addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2];
140 return ioc3_cfg_rd(addr, where, size, value,
141 bc->ioc3_sid[slot]);
142 }
143
144 addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[where ^ (4 - size)];
145
146 if (size == 1)
147 res = get_dbe(*value, (u8 *)addr);
148 else if (size == 2)
149 res = get_dbe(*value, (u16 *)addr);
150 else
151 res = get_dbe(*value, (u32 *)addr);
152
153 return res ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
154 }
155
pci_conf1_read_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * value)156 static int pci_conf1_read_config(struct pci_bus *bus, unsigned int devfn,
157 int where, int size, u32 *value)
158 {
159 struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
160 struct bridge_regs *bridge = bc->base;
161 int busno = bus->number;
162 int slot = PCI_SLOT(devfn);
163 int fn = PCI_FUNC(devfn);
164 void *addr;
165 u32 cf;
166 int res;
167
168 bridge_write(bc, b_pci_cfg, (busno << 16) | (slot << 11));
169 addr = &bridge->b_type1_cfg.c[(fn << 8) | PCI_VENDOR_ID];
170 if (get_dbe(cf, (u32 *)addr))
171 return PCIBIOS_DEVICE_NOT_FOUND;
172
173 /*
174 * IOC3 is broken beyond belief ... Don't even give the
175 * generic PCI code a chance to look at it for real ...
176 */
177 if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16))) {
178 addr = &bridge->b_type1_cfg.c[(fn << 8) | (where & ~3)];
179 return ioc3_cfg_rd(addr, where, size, value,
180 bc->ioc3_sid[slot]);
181 }
182
183 addr = &bridge->b_type1_cfg.c[(fn << 8) | (where ^ (4 - size))];
184
185 if (size == 1)
186 res = get_dbe(*value, (u8 *)addr);
187 else if (size == 2)
188 res = get_dbe(*value, (u16 *)addr);
189 else
190 res = get_dbe(*value, (u32 *)addr);
191
192 return res ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
193 }
194
pci_read_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * value)195 static int pci_read_config(struct pci_bus *bus, unsigned int devfn,
196 int where, int size, u32 *value)
197 {
198 if (!pci_is_root_bus(bus))
199 return pci_conf1_read_config(bus, devfn, where, size, value);
200
201 return pci_conf0_read_config(bus, devfn, where, size, value);
202 }
203
pci_conf0_write_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 value)204 static int pci_conf0_write_config(struct pci_bus *bus, unsigned int devfn,
205 int where, int size, u32 value)
206 {
207 struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
208 struct bridge_regs *bridge = bc->base;
209 int slot = PCI_SLOT(devfn);
210 int fn = PCI_FUNC(devfn);
211 void *addr;
212 u32 cf;
213 int res;
214
215 addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[PCI_VENDOR_ID];
216 if (get_dbe(cf, (u32 *)addr))
217 return PCIBIOS_DEVICE_NOT_FOUND;
218
219 /*
220 * IOC3 is broken beyond belief ... Don't even give the
221 * generic PCI code a chance to look at it for real ...
222 */
223 if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16))) {
224 addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2];
225 return ioc3_cfg_wr(addr, where, size, value);
226 }
227
228 addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[where ^ (4 - size)];
229
230 if (size == 1)
231 res = put_dbe(value, (u8 *)addr);
232 else if (size == 2)
233 res = put_dbe(value, (u16 *)addr);
234 else
235 res = put_dbe(value, (u32 *)addr);
236
237 if (res)
238 return PCIBIOS_DEVICE_NOT_FOUND;
239
240 return PCIBIOS_SUCCESSFUL;
241 }
242
pci_conf1_write_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 value)243 static int pci_conf1_write_config(struct pci_bus *bus, unsigned int devfn,
244 int where, int size, u32 value)
245 {
246 struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
247 struct bridge_regs *bridge = bc->base;
248 int slot = PCI_SLOT(devfn);
249 int fn = PCI_FUNC(devfn);
250 int busno = bus->number;
251 void *addr;
252 u32 cf;
253 int res;
254
255 bridge_write(bc, b_pci_cfg, (busno << 16) | (slot << 11));
256 addr = &bridge->b_type1_cfg.c[(fn << 8) | PCI_VENDOR_ID];
257 if (get_dbe(cf, (u32 *)addr))
258 return PCIBIOS_DEVICE_NOT_FOUND;
259
260 /*
261 * IOC3 is broken beyond belief ... Don't even give the
262 * generic PCI code a chance to look at it for real ...
263 */
264 if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16))) {
265 addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2];
266 return ioc3_cfg_wr(addr, where, size, value);
267 }
268
269 addr = &bridge->b_type1_cfg.c[(fn << 8) | (where ^ (4 - size))];
270
271 if (size == 1)
272 res = put_dbe(value, (u8 *)addr);
273 else if (size == 2)
274 res = put_dbe(value, (u16 *)addr);
275 else
276 res = put_dbe(value, (u32 *)addr);
277
278 if (res)
279 return PCIBIOS_DEVICE_NOT_FOUND;
280
281 return PCIBIOS_SUCCESSFUL;
282 }
283
pci_write_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 value)284 static int pci_write_config(struct pci_bus *bus, unsigned int devfn,
285 int where, int size, u32 value)
286 {
287 if (!pci_is_root_bus(bus))
288 return pci_conf1_write_config(bus, devfn, where, size, value);
289
290 return pci_conf0_write_config(bus, devfn, where, size, value);
291 }
292
293 static struct pci_ops bridge_pci_ops = {
294 .read = pci_read_config,
295 .write = pci_write_config,
296 };
297
298 struct bridge_irq_chip_data {
299 struct bridge_controller *bc;
300 nasid_t nasid;
301 };
302
bridge_set_affinity(struct irq_data * d,const struct cpumask * mask,bool force)303 static int bridge_set_affinity(struct irq_data *d, const struct cpumask *mask,
304 bool force)
305 {
306 #ifdef CONFIG_NUMA
307 struct bridge_irq_chip_data *data = d->chip_data;
308 int bit = d->parent_data->hwirq;
309 int pin = d->hwirq;
310 int ret, cpu;
311
312 ret = irq_chip_set_affinity_parent(d, mask, force);
313 if (ret >= 0) {
314 cpu = cpumask_first_and(mask, cpu_online_mask);
315 data->nasid = cpu_to_node(cpu);
316 bridge_write(data->bc, b_int_addr[pin].addr,
317 (((data->bc->intr_addr >> 30) & 0x30000) |
318 bit | (data->nasid << 8)));
319 bridge_read(data->bc, b_wid_tflush);
320 }
321 return ret;
322 #else
323 return irq_chip_set_affinity_parent(d, mask, force);
324 #endif
325 }
326
327 struct irq_chip bridge_irq_chip = {
328 .name = "BRIDGE",
329 .irq_mask = irq_chip_mask_parent,
330 .irq_unmask = irq_chip_unmask_parent,
331 .irq_set_affinity = bridge_set_affinity
332 };
333
bridge_domain_alloc(struct irq_domain * domain,unsigned int virq,unsigned int nr_irqs,void * arg)334 static int bridge_domain_alloc(struct irq_domain *domain, unsigned int virq,
335 unsigned int nr_irqs, void *arg)
336 {
337 struct bridge_irq_chip_data *data;
338 struct irq_alloc_info *info = arg;
339 int ret;
340
341 if (nr_irqs > 1 || !info)
342 return -EINVAL;
343
344 data = kzalloc(sizeof(*data), GFP_KERNEL);
345 if (!data)
346 return -ENOMEM;
347
348 ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
349 if (ret >= 0) {
350 data->bc = info->ctrl;
351 data->nasid = info->nasid;
352 irq_domain_set_info(domain, virq, info->pin, &bridge_irq_chip,
353 data, handle_level_irq, NULL, NULL);
354 } else {
355 kfree(data);
356 }
357
358 return ret;
359 }
360
bridge_domain_free(struct irq_domain * domain,unsigned int virq,unsigned int nr_irqs)361 static void bridge_domain_free(struct irq_domain *domain, unsigned int virq,
362 unsigned int nr_irqs)
363 {
364 struct irq_data *irqd = irq_domain_get_irq_data(domain, virq);
365
366 if (nr_irqs)
367 return;
368
369 kfree(irqd->chip_data);
370 irq_domain_free_irqs_top(domain, virq, nr_irqs);
371 }
372
bridge_domain_activate(struct irq_domain * domain,struct irq_data * irqd,bool reserve)373 static int bridge_domain_activate(struct irq_domain *domain,
374 struct irq_data *irqd, bool reserve)
375 {
376 struct bridge_irq_chip_data *data = irqd->chip_data;
377 struct bridge_controller *bc = data->bc;
378 int bit = irqd->parent_data->hwirq;
379 int pin = irqd->hwirq;
380 u32 device;
381
382 bridge_write(bc, b_int_addr[pin].addr,
383 (((bc->intr_addr >> 30) & 0x30000) |
384 bit | (data->nasid << 8)));
385 bridge_set(bc, b_int_enable, (1 << pin));
386 bridge_set(bc, b_int_enable, 0x7ffffe00); /* more stuff in int_enable */
387
388 /*
389 * Enable sending of an interrupt clear packet to the hub on a high to
390 * low transition of the interrupt pin.
391 *
392 * IRIX sets additional bits in the address which are documented as
393 * reserved in the bridge docs.
394 */
395 bridge_set(bc, b_int_mode, (1UL << pin));
396
397 /*
398 * We assume the bridge to have a 1:1 mapping between devices
399 * (slots) and intr pins.
400 */
401 device = bridge_read(bc, b_int_device);
402 device &= ~(7 << (pin*3));
403 device |= (pin << (pin*3));
404 bridge_write(bc, b_int_device, device);
405
406 bridge_read(bc, b_wid_tflush);
407 return 0;
408 }
409
bridge_domain_deactivate(struct irq_domain * domain,struct irq_data * irqd)410 static void bridge_domain_deactivate(struct irq_domain *domain,
411 struct irq_data *irqd)
412 {
413 struct bridge_irq_chip_data *data = irqd->chip_data;
414
415 bridge_clr(data->bc, b_int_enable, (1 << irqd->hwirq));
416 bridge_read(data->bc, b_wid_tflush);
417 }
418
419 static const struct irq_domain_ops bridge_domain_ops = {
420 .alloc = bridge_domain_alloc,
421 .free = bridge_domain_free,
422 .activate = bridge_domain_activate,
423 .deactivate = bridge_domain_deactivate
424 };
425
426 /*
427 * All observed requests have pin == 1. We could have a global here, that
428 * gets incremented and returned every time - unfortunately, pci_map_irq
429 * may be called on the same device over and over, and need to return the
430 * same value. On O2000, pin can be 0 or 1, and PCI slots can be [0..7].
431 *
432 * A given PCI device, in general, should be able to intr any of the cpus
433 * on any one of the hubs connected to its xbow.
434 */
bridge_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)435 static int bridge_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
436 {
437 struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
438 struct irq_alloc_info info;
439 int irq;
440
441 switch (pin) {
442 case PCI_INTERRUPT_UNKNOWN:
443 case PCI_INTERRUPT_INTA:
444 case PCI_INTERRUPT_INTC:
445 pin = 0;
446 break;
447 case PCI_INTERRUPT_INTB:
448 case PCI_INTERRUPT_INTD:
449 pin = 1;
450 }
451
452 irq = bc->pci_int[slot][pin];
453 if (irq == -1) {
454 info.ctrl = bc;
455 info.nasid = bc->nasid;
456 info.pin = bc->int_mapping[slot][pin];
457
458 irq = irq_domain_alloc_irqs(bc->domain, 1, bc->nasid, &info);
459 if (irq < 0)
460 return irq;
461
462 bc->pci_int[slot][pin] = irq;
463 }
464 return irq;
465 }
466
467 #define IOC3_SID(sid) (PCI_VENDOR_ID_SGI | ((sid) << 16))
468
bridge_setup_ip27_baseio6g(struct bridge_controller * bc)469 static void bridge_setup_ip27_baseio6g(struct bridge_controller *bc)
470 {
471 bc->ioc3_sid[2] = IOC3_SID(IOC3_SUBSYS_IP27_BASEIO6G);
472 bc->ioc3_sid[6] = IOC3_SID(IOC3_SUBSYS_IP27_MIO);
473 bc->int_mapping[2][1] = 4;
474 bc->int_mapping[6][1] = 6;
475 }
476
bridge_setup_ip27_baseio(struct bridge_controller * bc)477 static void bridge_setup_ip27_baseio(struct bridge_controller *bc)
478 {
479 bc->ioc3_sid[2] = IOC3_SID(IOC3_SUBSYS_IP27_BASEIO);
480 bc->int_mapping[2][1] = 4;
481 }
482
bridge_setup_ip29_baseio(struct bridge_controller * bc)483 static void bridge_setup_ip29_baseio(struct bridge_controller *bc)
484 {
485 bc->ioc3_sid[2] = IOC3_SID(IOC3_SUBSYS_IP29_SYSBOARD);
486 bc->int_mapping[2][1] = 3;
487 }
488
bridge_setup_ip30_sysboard(struct bridge_controller * bc)489 static void bridge_setup_ip30_sysboard(struct bridge_controller *bc)
490 {
491 bc->ioc3_sid[2] = IOC3_SID(IOC3_SUBSYS_IP30_SYSBOARD);
492 bc->int_mapping[2][1] = 4;
493 }
494
bridge_setup_menet(struct bridge_controller * bc)495 static void bridge_setup_menet(struct bridge_controller *bc)
496 {
497 bc->ioc3_sid[0] = IOC3_SID(IOC3_SUBSYS_MENET);
498 bc->ioc3_sid[1] = IOC3_SID(IOC3_SUBSYS_MENET);
499 bc->ioc3_sid[2] = IOC3_SID(IOC3_SUBSYS_MENET);
500 bc->ioc3_sid[3] = IOC3_SID(IOC3_SUBSYS_MENET4);
501 }
502
bridge_setup_io7(struct bridge_controller * bc)503 static void bridge_setup_io7(struct bridge_controller *bc)
504 {
505 bc->ioc3_sid[4] = IOC3_SID(IOC3_SUBSYS_IO7);
506 }
507
bridge_setup_io8(struct bridge_controller * bc)508 static void bridge_setup_io8(struct bridge_controller *bc)
509 {
510 bc->ioc3_sid[4] = IOC3_SID(IOC3_SUBSYS_IO8);
511 }
512
bridge_setup_io9(struct bridge_controller * bc)513 static void bridge_setup_io9(struct bridge_controller *bc)
514 {
515 bc->ioc3_sid[1] = IOC3_SID(IOC3_SUBSYS_IO9);
516 }
517
bridge_setup_ip34_fuel_sysboard(struct bridge_controller * bc)518 static void bridge_setup_ip34_fuel_sysboard(struct bridge_controller *bc)
519 {
520 bc->ioc3_sid[4] = IOC3_SID(IOC3_SUBSYS_IP34_SYSBOARD);
521 }
522
523 #define BRIDGE_BOARD_SETUP(_partno, _setup) \
524 { .match = _partno, .setup = _setup }
525
526 static const struct {
527 char *match;
528 void (*setup)(struct bridge_controller *bc);
529 } bridge_ioc3_devid[] = {
530 BRIDGE_BOARD_SETUP("030-0734-", bridge_setup_ip27_baseio6g),
531 BRIDGE_BOARD_SETUP("030-0880-", bridge_setup_ip27_baseio6g),
532 BRIDGE_BOARD_SETUP("030-1023-", bridge_setup_ip27_baseio),
533 BRIDGE_BOARD_SETUP("030-1124-", bridge_setup_ip27_baseio),
534 BRIDGE_BOARD_SETUP("030-1025-", bridge_setup_ip29_baseio),
535 BRIDGE_BOARD_SETUP("030-1244-", bridge_setup_ip29_baseio),
536 BRIDGE_BOARD_SETUP("030-1389-", bridge_setup_ip29_baseio),
537 BRIDGE_BOARD_SETUP("030-0887-", bridge_setup_ip30_sysboard),
538 BRIDGE_BOARD_SETUP("030-1467-", bridge_setup_ip30_sysboard),
539 BRIDGE_BOARD_SETUP("030-0873-", bridge_setup_menet),
540 BRIDGE_BOARD_SETUP("030-1557-", bridge_setup_io7),
541 BRIDGE_BOARD_SETUP("030-1673-", bridge_setup_io8),
542 BRIDGE_BOARD_SETUP("030-1771-", bridge_setup_io9),
543 BRIDGE_BOARD_SETUP("030-1707-", bridge_setup_ip34_fuel_sysboard),
544 };
545
bridge_setup_board(struct bridge_controller * bc,char * partnum)546 static void bridge_setup_board(struct bridge_controller *bc, char *partnum)
547 {
548 int i;
549
550 for (i = 0; i < ARRAY_SIZE(bridge_ioc3_devid); i++)
551 if (!strncmp(partnum, bridge_ioc3_devid[i].match,
552 strlen(bridge_ioc3_devid[i].match))) {
553 bridge_ioc3_devid[i].setup(bc);
554 }
555 }
556
bridge_nvmem_match(struct device * dev,const void * data)557 static int bridge_nvmem_match(struct device *dev, const void *data)
558 {
559 const char *name = dev_name(dev);
560 const char *prefix = data;
561
562 if (strlen(name) < strlen(prefix))
563 return 0;
564
565 return memcmp(prefix, dev_name(dev), strlen(prefix)) == 0;
566 }
567
bridge_get_partnum(u64 baddr,char * partnum)568 static int bridge_get_partnum(u64 baddr, char *partnum)
569 {
570 struct nvmem_device *nvmem;
571 char prefix[24];
572 u8 prom[64];
573 int i, j;
574 int ret;
575
576 snprintf(prefix, sizeof(prefix), "bridge-%012llx-0b-", baddr);
577
578 nvmem = nvmem_device_find(prefix, bridge_nvmem_match);
579 if (IS_ERR(nvmem))
580 return PTR_ERR(nvmem);
581
582 ret = nvmem_device_read(nvmem, 0, 64, prom);
583 nvmem_device_put(nvmem);
584
585 if (ret != 64)
586 return ret;
587
588 if (crc16(CRC16_INIT, prom, 32) != CRC16_VALID ||
589 crc16(CRC16_INIT, prom + 32, 32) != CRC16_VALID)
590 return -EINVAL;
591
592 /* Assemble part number */
593 j = 0;
594 for (i = 0; i < 19; i++)
595 if (prom[i + 11] != ' ')
596 partnum[j++] = prom[i + 11];
597
598 for (i = 0; i < 6; i++)
599 if (prom[i + 32] != ' ')
600 partnum[j++] = prom[i + 32];
601
602 partnum[j] = 0;
603
604 return 0;
605 }
606
bridge_probe(struct platform_device * pdev)607 static int bridge_probe(struct platform_device *pdev)
608 {
609 struct xtalk_bridge_platform_data *bd = dev_get_platdata(&pdev->dev);
610 struct device *dev = &pdev->dev;
611 struct bridge_controller *bc;
612 struct pci_host_bridge *host;
613 struct irq_domain *domain, *parent;
614 struct fwnode_handle *fn;
615 char partnum[26];
616 int slot;
617 int err;
618
619 /* get part number from one wire prom */
620 if (bridge_get_partnum(virt_to_phys((void *)bd->bridge_addr), partnum))
621 return -EPROBE_DEFER; /* not available yet */
622
623 parent = irq_get_default_host();
624 if (!parent)
625 return -ENODEV;
626 fn = irq_domain_alloc_named_fwnode("BRIDGE");
627 if (!fn)
628 return -ENOMEM;
629 domain = irq_domain_create_hierarchy(parent, 0, 8, fn,
630 &bridge_domain_ops, NULL);
631 if (!domain) {
632 irq_domain_free_fwnode(fn);
633 return -ENOMEM;
634 }
635
636 pci_set_flags(PCI_PROBE_ONLY);
637
638 host = devm_pci_alloc_host_bridge(dev, sizeof(*bc));
639 if (!host) {
640 err = -ENOMEM;
641 goto err_remove_domain;
642 }
643
644 bc = pci_host_bridge_priv(host);
645
646 bc->busn.name = "Bridge PCI busn";
647 bc->busn.start = 0;
648 bc->busn.end = 0xff;
649 bc->busn.flags = IORESOURCE_BUS;
650
651 bc->domain = domain;
652
653 pci_add_resource_offset(&host->windows, &bd->mem, bd->mem_offset);
654 pci_add_resource_offset(&host->windows, &bd->io, bd->io_offset);
655 pci_add_resource(&host->windows, &bc->busn);
656
657 err = devm_request_pci_bus_resources(dev, &host->windows);
658 if (err < 0)
659 goto err_free_resource;
660
661 bc->nasid = bd->nasid;
662
663 bc->baddr = (u64)bd->masterwid << 60 | PCI64_ATTR_BAR;
664 bc->base = (struct bridge_regs *)bd->bridge_addr;
665 bc->intr_addr = bd->intr_addr;
666
667 /*
668 * Clear all pending interrupts.
669 */
670 bridge_write(bc, b_int_rst_stat, BRIDGE_IRR_ALL_CLR);
671
672 /*
673 * Until otherwise set up, assume all interrupts are from slot 0
674 */
675 bridge_write(bc, b_int_device, 0x0);
676
677 /*
678 * disable swapping for big windows
679 */
680 bridge_clr(bc, b_wid_control,
681 BRIDGE_CTRL_IO_SWAP | BRIDGE_CTRL_MEM_SWAP);
682 #ifdef CONFIG_PAGE_SIZE_4KB
683 bridge_clr(bc, b_wid_control, BRIDGE_CTRL_PAGE_SIZE);
684 #else /* 16kB or larger */
685 bridge_set(bc, b_wid_control, BRIDGE_CTRL_PAGE_SIZE);
686 #endif
687
688 /*
689 * Hmm... IRIX sets additional bits in the address which
690 * are documented as reserved in the bridge docs.
691 */
692 bridge_write(bc, b_wid_int_upper,
693 ((bc->intr_addr >> 32) & 0xffff) | (bd->masterwid << 16));
694 bridge_write(bc, b_wid_int_lower, bc->intr_addr & 0xffffffff);
695 bridge_write(bc, b_dir_map, (bd->masterwid << 20)); /* DMA */
696 bridge_write(bc, b_int_enable, 0);
697
698 for (slot = 0; slot < 8; slot++) {
699 bridge_set(bc, b_device[slot].reg, BRIDGE_DEV_SWAP_DIR);
700 bc->pci_int[slot][0] = -1;
701 bc->pci_int[slot][1] = -1;
702 /* default interrupt pin mapping */
703 bc->int_mapping[slot][0] = slot;
704 bc->int_mapping[slot][1] = slot ^ 4;
705 }
706 bridge_read(bc, b_wid_tflush); /* wait until Bridge PIO complete */
707
708 bridge_setup_board(bc, partnum);
709
710 host->dev.parent = dev;
711 host->sysdata = bc;
712 host->busnr = 0;
713 host->ops = &bridge_pci_ops;
714 host->map_irq = bridge_map_irq;
715 host->swizzle_irq = pci_common_swizzle;
716
717 err = pci_scan_root_bus_bridge(host);
718 if (err < 0)
719 goto err_free_resource;
720
721 pci_bus_claim_resources(host->bus);
722 pci_bus_add_devices(host->bus);
723
724 platform_set_drvdata(pdev, host->bus);
725
726 return 0;
727
728 err_free_resource:
729 pci_free_resource_list(&host->windows);
730 err_remove_domain:
731 irq_domain_remove(domain);
732 irq_domain_free_fwnode(fn);
733 return err;
734 }
735
bridge_remove(struct platform_device * pdev)736 static int bridge_remove(struct platform_device *pdev)
737 {
738 struct pci_bus *bus = platform_get_drvdata(pdev);
739 struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
740 struct fwnode_handle *fn = bc->domain->fwnode;
741
742 irq_domain_remove(bc->domain);
743 irq_domain_free_fwnode(fn);
744 pci_lock_rescan_remove();
745 pci_stop_root_bus(bus);
746 pci_remove_root_bus(bus);
747 pci_unlock_rescan_remove();
748
749 return 0;
750 }
751
752 static struct platform_driver bridge_driver = {
753 .probe = bridge_probe,
754 .remove = bridge_remove,
755 .driver = {
756 .name = "xtalk-bridge",
757 }
758 };
759
760 builtin_platform_driver(bridge_driver);
761
