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14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/io.h>
17#include <linux/kernel.h>
18#include <linux/of_address.h>
19#include <linux/of_device.h>
20#include <linux/of_irq.h>
21#include <linux/of_pci.h>
22#include <linux/pci.h>
23#include <linux/platform_device.h>
24#include <linux/slab.h>
25#include <linux/irqdomain.h>
26#include <linux/irqchip/chained_irq.h>
27#include <linux/bitops.h>
28#include <linux/irq.h>
29#include <linux/clk.h>
30
31
32
33
34
35#define PCI_IOSIZE 0x00
36#define PCI_PROT 0x04
37#define PCI_CTRL 0x08
38#define PCI_SOFTRST 0x10
39#define PCI_CONFIG 0x28
40#define PCI_DATA 0x2C
41
42#define FARADAY_PCI_STATUS_CMD 0x04
43#define FARADAY_PCI_PMC 0x40
44#define FARADAY_PCI_PMCSR 0x44
45#define FARADAY_PCI_CTRL1 0x48
46#define FARADAY_PCI_CTRL2 0x4C
47#define FARADAY_PCI_MEM1_BASE_SIZE 0x50
48#define FARADAY_PCI_MEM2_BASE_SIZE 0x54
49#define FARADAY_PCI_MEM3_BASE_SIZE 0x58
50
51#define PCI_STATUS_66MHZ_CAPABLE BIT(21)
52
53
54#define PCI_CTRL2_INTSTS_SHIFT 28
55#define PCI_CTRL2_INTMASK_CMDERR BIT(27)
56#define PCI_CTRL2_INTMASK_PARERR BIT(26)
57
58#define PCI_CTRL2_INTMASK_SHIFT 22
59#define PCI_CTRL2_INTMASK_MABRT_RX BIT(21)
60#define PCI_CTRL2_INTMASK_TABRT_RX BIT(20)
61#define PCI_CTRL2_INTMASK_TABRT_TX BIT(19)
62#define PCI_CTRL2_INTMASK_RETRY4 BIT(18)
63#define PCI_CTRL2_INTMASK_SERR_RX BIT(17)
64#define PCI_CTRL2_INTMASK_PERR_RX BIT(16)
65
66#define PCI_CTRL2_MSTPRI_REQ6 BIT(14)
67#define PCI_CTRL2_MSTPRI_REQ5 BIT(13)
68#define PCI_CTRL2_MSTPRI_REQ4 BIT(12)
69#define PCI_CTRL2_MSTPRI_REQ3 BIT(11)
70#define PCI_CTRL2_MSTPRI_REQ2 BIT(10)
71#define PCI_CTRL2_MSTPRI_REQ1 BIT(9)
72#define PCI_CTRL2_MSTPRI_REQ0 BIT(8)
73
74
75
76
77
78
79
80
81#define FARADAY_PCI_MEMBASE_MASK 0xfff00000
82#define FARADAY_PCI_MEMSIZE_1MB 0x0
83#define FARADAY_PCI_MEMSIZE_2MB 0x1
84#define FARADAY_PCI_MEMSIZE_4MB 0x2
85#define FARADAY_PCI_MEMSIZE_8MB 0x3
86#define FARADAY_PCI_MEMSIZE_16MB 0x4
87#define FARADAY_PCI_MEMSIZE_32MB 0x5
88#define FARADAY_PCI_MEMSIZE_64MB 0x6
89#define FARADAY_PCI_MEMSIZE_128MB 0x7
90#define FARADAY_PCI_MEMSIZE_256MB 0x8
91#define FARADAY_PCI_MEMSIZE_512MB 0x9
92#define FARADAY_PCI_MEMSIZE_1GB 0xa
93#define FARADAY_PCI_MEMSIZE_2GB 0xb
94#define FARADAY_PCI_MEMSIZE_SHIFT 16
95
96
97
98
99
100#define FARADAY_PCI_DMA_MEM1_BASE 0x00000000
101#define FARADAY_PCI_DMA_MEM2_BASE 0x00000000
102#define FARADAY_PCI_DMA_MEM3_BASE 0x00000000
103
104
105#define PCI_CONF_ENABLE BIT(31)
106#define PCI_CONF_WHERE(r) ((r) & 0xFC)
107#define PCI_CONF_BUS(b) (((b) & 0xFF) << 16)
108#define PCI_CONF_DEVICE(d) (((d) & 0x1F) << 11)
109#define PCI_CONF_FUNCTION(f) (((f) & 0x07) << 8)
110
111
112
113
114
115
116struct faraday_pci_variant {
117 bool cascaded_irq;
118};
119
120struct faraday_pci {
121 struct device *dev;
122 void __iomem *base;
123 struct irq_domain *irqdomain;
124 struct pci_bus *bus;
125 struct clk *bus_clk;
126};
127
128static int faraday_res_to_memcfg(resource_size_t mem_base,
129 resource_size_t mem_size, u32 *val)
130{
131 u32 outval;
132
133 switch (mem_size) {
134 case SZ_1M:
135 outval = FARADAY_PCI_MEMSIZE_1MB;
136 break;
137 case SZ_2M:
138 outval = FARADAY_PCI_MEMSIZE_2MB;
139 break;
140 case SZ_4M:
141 outval = FARADAY_PCI_MEMSIZE_4MB;
142 break;
143 case SZ_8M:
144 outval = FARADAY_PCI_MEMSIZE_8MB;
145 break;
146 case SZ_16M:
147 outval = FARADAY_PCI_MEMSIZE_16MB;
148 break;
149 case SZ_32M:
150 outval = FARADAY_PCI_MEMSIZE_32MB;
151 break;
152 case SZ_64M:
153 outval = FARADAY_PCI_MEMSIZE_64MB;
154 break;
155 case SZ_128M:
156 outval = FARADAY_PCI_MEMSIZE_128MB;
157 break;
158 case SZ_256M:
159 outval = FARADAY_PCI_MEMSIZE_256MB;
160 break;
161 case SZ_512M:
162 outval = FARADAY_PCI_MEMSIZE_512MB;
163 break;
164 case SZ_1G:
165 outval = FARADAY_PCI_MEMSIZE_1GB;
166 break;
167 case SZ_2G:
168 outval = FARADAY_PCI_MEMSIZE_2GB;
169 break;
170 default:
171 return -EINVAL;
172 }
173 outval <<= FARADAY_PCI_MEMSIZE_SHIFT;
174
175
176 if (mem_base & ~(FARADAY_PCI_MEMBASE_MASK))
177 pr_warn("truncated PCI memory base\n");
178
179 outval |= (mem_base & FARADAY_PCI_MEMBASE_MASK);
180 pr_debug("Translated pci base @%pap, size %pap to config %08x\n",
181 &mem_base, &mem_size, outval);
182
183 *val = outval;
184 return 0;
185}
186
187static int faraday_raw_pci_read_config(struct faraday_pci *p, int bus_number,
188 unsigned int fn, int config, int size,
189 u32 *value)
190{
191 writel(PCI_CONF_BUS(bus_number) |
192 PCI_CONF_DEVICE(PCI_SLOT(fn)) |
193 PCI_CONF_FUNCTION(PCI_FUNC(fn)) |
194 PCI_CONF_WHERE(config) |
195 PCI_CONF_ENABLE,
196 p->base + PCI_CONFIG);
197
198 *value = readl(p->base + PCI_DATA);
199
200 if (size == 1)
201 *value = (*value >> (8 * (config & 3))) & 0xFF;
202 else if (size == 2)
203 *value = (*value >> (8 * (config & 3))) & 0xFFFF;
204
205 return PCIBIOS_SUCCESSFUL;
206}
207
208static int faraday_pci_read_config(struct pci_bus *bus, unsigned int fn,
209 int config, int size, u32 *value)
210{
211 struct faraday_pci *p = bus->sysdata;
212
213 dev_dbg(&bus->dev,
214 "[read] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",
215 PCI_SLOT(fn), PCI_FUNC(fn), config, size, *value);
216
217 return faraday_raw_pci_read_config(p, bus->number, fn, config, size, value);
218}
219
220static int faraday_raw_pci_write_config(struct faraday_pci *p, int bus_number,
221 unsigned int fn, int config, int size,
222 u32 value)
223{
224 int ret = PCIBIOS_SUCCESSFUL;
225
226 writel(PCI_CONF_BUS(bus_number) |
227 PCI_CONF_DEVICE(PCI_SLOT(fn)) |
228 PCI_CONF_FUNCTION(PCI_FUNC(fn)) |
229 PCI_CONF_WHERE(config) |
230 PCI_CONF_ENABLE,
231 p->base + PCI_CONFIG);
232
233 switch (size) {
234 case 4:
235 writel(value, p->base + PCI_DATA);
236 break;
237 case 2:
238 writew(value, p->base + PCI_DATA + (config & 3));
239 break;
240 case 1:
241 writeb(value, p->base + PCI_DATA + (config & 3));
242 break;
243 default:
244 ret = PCIBIOS_BAD_REGISTER_NUMBER;
245 }
246
247 return ret;
248}
249
250static int faraday_pci_write_config(struct pci_bus *bus, unsigned int fn,
251 int config, int size, u32 value)
252{
253 struct faraday_pci *p = bus->sysdata;
254
255 dev_dbg(&bus->dev,
256 "[write] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",
257 PCI_SLOT(fn), PCI_FUNC(fn), config, size, value);
258
259 return faraday_raw_pci_write_config(p, bus->number, fn, config, size,
260 value);
261}
262
263static struct pci_ops faraday_pci_ops = {
264 .read = faraday_pci_read_config,
265 .write = faraday_pci_write_config,
266};
267
268static void faraday_pci_ack_irq(struct irq_data *d)
269{
270 struct faraday_pci *p = irq_data_get_irq_chip_data(d);
271 unsigned int reg;
272
273 faraday_raw_pci_read_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, ®);
274 reg &= ~(0xF << PCI_CTRL2_INTSTS_SHIFT);
275 reg |= BIT(irqd_to_hwirq(d) + PCI_CTRL2_INTSTS_SHIFT);
276 faraday_raw_pci_write_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, reg);
277}
278
279static void faraday_pci_mask_irq(struct irq_data *d)
280{
281 struct faraday_pci *p = irq_data_get_irq_chip_data(d);
282 unsigned int reg;
283
284 faraday_raw_pci_read_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, ®);
285 reg &= ~((0xF << PCI_CTRL2_INTSTS_SHIFT)
286 | BIT(irqd_to_hwirq(d) + PCI_CTRL2_INTMASK_SHIFT));
287 faraday_raw_pci_write_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, reg);
288}
289
290static void faraday_pci_unmask_irq(struct irq_data *d)
291{
292 struct faraday_pci *p = irq_data_get_irq_chip_data(d);
293 unsigned int reg;
294
295 faraday_raw_pci_read_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, ®);
296 reg &= ~(0xF << PCI_CTRL2_INTSTS_SHIFT);
297 reg |= BIT(irqd_to_hwirq(d) + PCI_CTRL2_INTMASK_SHIFT);
298 faraday_raw_pci_write_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, reg);
299}
300
301static void faraday_pci_irq_handler(struct irq_desc *desc)
302{
303 struct faraday_pci *p = irq_desc_get_handler_data(desc);
304 struct irq_chip *irqchip = irq_desc_get_chip(desc);
305 unsigned int irq_stat, reg, i;
306
307 faraday_raw_pci_read_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, ®);
308 irq_stat = reg >> PCI_CTRL2_INTSTS_SHIFT;
309
310 chained_irq_enter(irqchip, desc);
311
312 for (i = 0; i < 4; i++) {
313 if ((irq_stat & BIT(i)) == 0)
314 continue;
315 generic_handle_irq(irq_find_mapping(p->irqdomain, i));
316 }
317
318 chained_irq_exit(irqchip, desc);
319}
320
321static struct irq_chip faraday_pci_irq_chip = {
322 .name = "PCI",
323 .irq_ack = faraday_pci_ack_irq,
324 .irq_mask = faraday_pci_mask_irq,
325 .irq_unmask = faraday_pci_unmask_irq,
326};
327
328static int faraday_pci_irq_map(struct irq_domain *domain, unsigned int irq,
329 irq_hw_number_t hwirq)
330{
331 irq_set_chip_and_handler(irq, &faraday_pci_irq_chip, handle_level_irq);
332 irq_set_chip_data(irq, domain->host_data);
333
334 return 0;
335}
336
337static const struct irq_domain_ops faraday_pci_irqdomain_ops = {
338 .map = faraday_pci_irq_map,
339};
340
341static int faraday_pci_setup_cascaded_irq(struct faraday_pci *p)
342{
343 struct device_node *intc = of_get_next_child(p->dev->of_node, NULL);
344 int irq;
345 int i;
346
347 if (!intc) {
348 dev_err(p->dev, "missing child interrupt-controller node\n");
349 return -EINVAL;
350 }
351
352
353 irq = of_irq_get(intc, 0);
354 if (irq <= 0) {
355 dev_err(p->dev, "failed to get parent IRQ\n");
356 return irq ?: -EINVAL;
357 }
358
359 p->irqdomain = irq_domain_add_linear(intc, PCI_NUM_INTX,
360 &faraday_pci_irqdomain_ops, p);
361 if (!p->irqdomain) {
362 dev_err(p->dev, "failed to create Gemini PCI IRQ domain\n");
363 return -EINVAL;
364 }
365
366 irq_set_chained_handler_and_data(irq, faraday_pci_irq_handler, p);
367
368 for (i = 0; i < 4; i++)
369 irq_create_mapping(p->irqdomain, i);
370
371 return 0;
372}
373
374static int pci_dma_range_parser_init(struct of_pci_range_parser *parser,
375 struct device_node *node)
376{
377 const int na = 3, ns = 2;
378 int rlen;
379
380 parser->node = node;
381 parser->pna = of_n_addr_cells(node);
382 parser->np = parser->pna + na + ns;
383
384 parser->range = of_get_property(node, "dma-ranges", &rlen);
385 if (!parser->range)
386 return -ENOENT;
387 parser->end = parser->range + rlen / sizeof(__be32);
388
389 return 0;
390}
391
392static int faraday_pci_parse_map_dma_ranges(struct faraday_pci *p,
393 struct device_node *np)
394{
395 struct of_pci_range range;
396 struct of_pci_range_parser parser;
397 struct device *dev = p->dev;
398 u32 confreg[3] = {
399 FARADAY_PCI_MEM1_BASE_SIZE,
400 FARADAY_PCI_MEM2_BASE_SIZE,
401 FARADAY_PCI_MEM3_BASE_SIZE,
402 };
403 int i = 0;
404 u32 val;
405
406 if (pci_dma_range_parser_init(&parser, np)) {
407 dev_err(dev, "missing dma-ranges property\n");
408 return -EINVAL;
409 }
410
411
412
413
414 for_each_of_pci_range(&parser, &range) {
415 u64 end = range.pci_addr + range.size - 1;
416 int ret;
417
418 ret = faraday_res_to_memcfg(range.pci_addr, range.size, &val);
419 if (ret) {
420 dev_err(dev,
421 "DMA range %d: illegal MEM resource size\n", i);
422 return -EINVAL;
423 }
424
425 dev_info(dev, "DMA MEM%d BASE: 0x%016llx -> 0x%016llx config %08x\n",
426 i + 1, range.pci_addr, end, val);
427 if (i <= 2) {
428 faraday_raw_pci_write_config(p, 0, 0, confreg[i],
429 4, val);
430 } else {
431 dev_err(dev, "ignore extraneous dma-range %d\n", i);
432 break;
433 }
434
435 i++;
436 }
437
438 return 0;
439}
440
441static int faraday_pci_probe(struct platform_device *pdev)
442{
443 struct device *dev = &pdev->dev;
444 const struct faraday_pci_variant *variant =
445 of_device_get_match_data(dev);
446 struct resource *regs;
447 resource_size_t io_base;
448 struct resource_entry *win;
449 struct faraday_pci *p;
450 struct resource *mem;
451 struct resource *io;
452 struct pci_host_bridge *host;
453 struct clk *clk;
454 unsigned char max_bus_speed = PCI_SPEED_33MHz;
455 unsigned char cur_bus_speed = PCI_SPEED_33MHz;
456 int ret;
457 u32 val;
458 LIST_HEAD(res);
459
460 host = devm_pci_alloc_host_bridge(dev, sizeof(*p));
461 if (!host)
462 return -ENOMEM;
463
464 host->dev.parent = dev;
465 host->ops = &faraday_pci_ops;
466 host->busnr = 0;
467 host->msi = NULL;
468 host->map_irq = of_irq_parse_and_map_pci;
469 host->swizzle_irq = pci_common_swizzle;
470 p = pci_host_bridge_priv(host);
471 host->sysdata = p;
472 p->dev = dev;
473
474
475 clk = devm_clk_get(dev, "PCLK");
476 if (IS_ERR(clk))
477 return PTR_ERR(clk);
478 ret = clk_prepare_enable(clk);
479 if (ret) {
480 dev_err(dev, "could not prepare PCLK\n");
481 return ret;
482 }
483 p->bus_clk = devm_clk_get(dev, "PCICLK");
484 if (IS_ERR(p->bus_clk))
485 return PTR_ERR(clk);
486 ret = clk_prepare_enable(p->bus_clk);
487 if (ret) {
488 dev_err(dev, "could not prepare PCICLK\n");
489 return ret;
490 }
491
492 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
493 p->base = devm_ioremap_resource(dev, regs);
494 if (IS_ERR(p->base))
495 return PTR_ERR(p->base);
496
497 ret = of_pci_get_host_bridge_resources(dev->of_node, 0, 0xff,
498 &res, &io_base);
499 if (ret)
500 return ret;
501
502 ret = devm_request_pci_bus_resources(dev, &res);
503 if (ret)
504 return ret;
505
506
507 resource_list_for_each_entry(win, &res) {
508 switch (resource_type(win->res)) {
509 case IORESOURCE_IO:
510 io = win->res;
511 io->name = "Gemini PCI I/O";
512 if (!faraday_res_to_memcfg(io->start - win->offset,
513 resource_size(io), &val)) {
514
515 writel(val, p->base + PCI_IOSIZE);
516 } else {
517 dev_err(dev, "illegal IO mem size\n");
518 return -EINVAL;
519 }
520 ret = pci_remap_iospace(io, io_base);
521 if (ret) {
522 dev_warn(dev, "error %d: failed to map resource %pR\n",
523 ret, io);
524 continue;
525 }
526 break;
527 case IORESOURCE_MEM:
528 mem = win->res;
529 mem->name = "Gemini PCI MEM";
530 break;
531 case IORESOURCE_BUS:
532 break;
533 default:
534 break;
535 }
536 }
537
538
539 val = readl(p->base + PCI_CTRL);
540 val |= PCI_COMMAND_IO;
541 val |= PCI_COMMAND_MEMORY;
542 val |= PCI_COMMAND_MASTER;
543 writel(val, p->base + PCI_CTRL);
544
545 faraday_raw_pci_write_config(p, 0, 0, FARADAY_PCI_CTRL2 + 2, 2, 0xF000);
546 if (variant->cascaded_irq) {
547 ret = faraday_pci_setup_cascaded_irq(p);
548 if (ret) {
549 dev_err(dev, "failed to setup cascaded IRQ\n");
550 return ret;
551 }
552 }
553
554
555 if (!IS_ERR(p->bus_clk)) {
556 unsigned long rate;
557 u32 val;
558
559 faraday_raw_pci_read_config(p, 0, 0,
560 FARADAY_PCI_STATUS_CMD, 4, &val);
561 rate = clk_get_rate(p->bus_clk);
562
563 if ((rate == 33000000) && (val & PCI_STATUS_66MHZ_CAPABLE)) {
564 dev_info(dev, "33MHz bus is 66MHz capable\n");
565 max_bus_speed = PCI_SPEED_66MHz;
566 ret = clk_set_rate(p->bus_clk, 66000000);
567 if (ret)
568 dev_err(dev, "failed to set bus clock\n");
569 } else {
570 dev_info(dev, "33MHz only bus\n");
571 max_bus_speed = PCI_SPEED_33MHz;
572 }
573
574
575 rate = clk_get_rate(p->bus_clk);
576 if (rate == 33000000)
577 cur_bus_speed = PCI_SPEED_33MHz;
578 if (rate == 66000000)
579 cur_bus_speed = PCI_SPEED_66MHz;
580 }
581
582 ret = faraday_pci_parse_map_dma_ranges(p, dev->of_node);
583 if (ret)
584 return ret;
585
586 list_splice_init(&res, &host->windows);
587 ret = pci_scan_root_bus_bridge(host);
588 if (ret) {
589 dev_err(dev, "failed to scan host: %d\n", ret);
590 return ret;
591 }
592 p->bus = host->bus;
593 p->bus->max_bus_speed = max_bus_speed;
594 p->bus->cur_bus_speed = cur_bus_speed;
595
596 pci_bus_assign_resources(p->bus);
597 pci_bus_add_devices(p->bus);
598 pci_free_resource_list(&res);
599
600 return 0;
601}
602
603
604
605
606
607const struct faraday_pci_variant faraday_regular = {
608 .cascaded_irq = true,
609};
610
611const struct faraday_pci_variant faraday_dual = {
612 .cascaded_irq = false,
613};
614
615static const struct of_device_id faraday_pci_of_match[] = {
616 {
617 .compatible = "faraday,ftpci100",
618 .data = &faraday_regular,
619 },
620 {
621 .compatible = "faraday,ftpci100-dual",
622 .data = &faraday_dual,
623 },
624 {},
625};
626
627static struct platform_driver faraday_pci_driver = {
628 .driver = {
629 .name = "ftpci100",
630 .of_match_table = of_match_ptr(faraday_pci_of_match),
631 .suppress_bind_attrs = true,
632 },
633 .probe = faraday_pci_probe,
634};
635builtin_platform_driver(faraday_pci_driver);
636
