This source file includes following definitions.
- wait_lpc_idle
- hisi_lpc_target_in
- hisi_lpc_target_out
- hisi_lpc_pio_to_addr
- hisi_lpc_comm_in
- hisi_lpc_comm_out
- hisi_lpc_comm_ins
- hisi_lpc_comm_outs
- hisi_lpc_acpi_xlat_io_res
- hisi_lpc_acpi_set_io_res
- hisi_lpc_acpi_remove_subdev
- hisi_lpc_acpi_remove
- hisi_lpc_acpi_probe
- hisi_lpc_acpi_probe
- hisi_lpc_acpi_remove
- hisi_lpc_probe
- hisi_lpc_remove
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9 #include <linux/acpi.h>
10 #include <linux/console.h>
11 #include <linux/delay.h>
12 #include <linux/io.h>
13 #include <linux/logic_pio.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/of_address.h>
17 #include <linux/of_platform.h>
18 #include <linux/pci.h>
19 #include <linux/serial_8250.h>
20 #include <linux/slab.h>
21
22 #define DRV_NAME "hisi-lpc"
23
24
25
26
27
28
29 #define FG_INCRADDR_LPC 0x02
30
31 struct lpc_cycle_para {
32 unsigned int opflags;
33 unsigned int csize;
34 };
35
36 struct hisi_lpc_dev {
37 spinlock_t cycle_lock;
38 void __iomem *membase;
39 struct logic_pio_hwaddr *io_host;
40 };
41
42
43 #define LPC_MAX_DWIDTH 4
44
45 #define LPC_REG_STARTUP_SIGNAL 0x00
46 #define LPC_REG_STARTUP_SIGNAL_START BIT(0)
47 #define LPC_REG_OP_STATUS 0x04
48 #define LPC_REG_OP_STATUS_IDLE BIT(0)
49 #define LPC_REG_OP_STATUS_FINISHED BIT(1)
50 #define LPC_REG_OP_LEN 0x10
51 #define LPC_REG_CMD 0x14
52 #define LPC_REG_CMD_OP BIT(0)
53 #define LPC_REG_CMD_SAMEADDR BIT(3)
54 #define LPC_REG_ADDR 0x20
55 #define LPC_REG_WDATA 0x24
56 #define LPC_REG_RDATA 0x28
57
58
59 #define LPC_NSEC_PERWAIT 100
60
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70
71
72 #define LPC_MAX_WAITCNT 1300
73
74
75 #define LPC_PEROP_WAITCNT 100
76
77 static int wait_lpc_idle(unsigned char *mbase, unsigned int waitcnt)
78 {
79 u32 status;
80
81 do {
82 status = readl(mbase + LPC_REG_OP_STATUS);
83 if (status & LPC_REG_OP_STATUS_IDLE)
84 return (status & LPC_REG_OP_STATUS_FINISHED) ? 0 : -EIO;
85 ndelay(LPC_NSEC_PERWAIT);
86 } while (--waitcnt);
87
88 return -ETIME;
89 }
90
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99
100
101 static int hisi_lpc_target_in(struct hisi_lpc_dev *lpcdev,
102 struct lpc_cycle_para *para, unsigned long addr,
103 unsigned char *buf, unsigned long opcnt)
104 {
105 unsigned int cmd_word;
106 unsigned int waitcnt;
107 unsigned long flags;
108 int ret;
109
110 if (!buf || !opcnt || !para || !para->csize || !lpcdev)
111 return -EINVAL;
112
113 cmd_word = 0;
114 waitcnt = LPC_PEROP_WAITCNT;
115 if (!(para->opflags & FG_INCRADDR_LPC)) {
116 cmd_word |= LPC_REG_CMD_SAMEADDR;
117 waitcnt = LPC_MAX_WAITCNT;
118 }
119
120
121 spin_lock_irqsave(&lpcdev->cycle_lock, flags);
122
123 writel_relaxed(opcnt, lpcdev->membase + LPC_REG_OP_LEN);
124 writel_relaxed(cmd_word, lpcdev->membase + LPC_REG_CMD);
125 writel_relaxed(addr, lpcdev->membase + LPC_REG_ADDR);
126
127 writel(LPC_REG_STARTUP_SIGNAL_START,
128 lpcdev->membase + LPC_REG_STARTUP_SIGNAL);
129
130
131 ret = wait_lpc_idle(lpcdev->membase, waitcnt);
132 if (ret) {
133 spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);
134 return ret;
135 }
136
137 readsb(lpcdev->membase + LPC_REG_RDATA, buf, opcnt);
138
139 spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);
140
141 return 0;
142 }
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152
153
154 static int hisi_lpc_target_out(struct hisi_lpc_dev *lpcdev,
155 struct lpc_cycle_para *para, unsigned long addr,
156 const unsigned char *buf, unsigned long opcnt)
157 {
158 unsigned int waitcnt;
159 unsigned long flags;
160 u32 cmd_word;
161 int ret;
162
163 if (!buf || !opcnt || !para || !lpcdev)
164 return -EINVAL;
165
166
167 cmd_word = LPC_REG_CMD_OP;
168 waitcnt = LPC_PEROP_WAITCNT;
169 if (!(para->opflags & FG_INCRADDR_LPC)) {
170 cmd_word |= LPC_REG_CMD_SAMEADDR;
171 waitcnt = LPC_MAX_WAITCNT;
172 }
173
174 spin_lock_irqsave(&lpcdev->cycle_lock, flags);
175
176 writel_relaxed(opcnt, lpcdev->membase + LPC_REG_OP_LEN);
177 writel_relaxed(cmd_word, lpcdev->membase + LPC_REG_CMD);
178 writel_relaxed(addr, lpcdev->membase + LPC_REG_ADDR);
179
180 writesb(lpcdev->membase + LPC_REG_WDATA, buf, opcnt);
181
182 writel(LPC_REG_STARTUP_SIGNAL_START,
183 lpcdev->membase + LPC_REG_STARTUP_SIGNAL);
184
185
186 ret = wait_lpc_idle(lpcdev->membase, waitcnt);
187
188 spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);
189
190 return ret;
191 }
192
193 static unsigned long hisi_lpc_pio_to_addr(struct hisi_lpc_dev *lpcdev,
194 unsigned long pio)
195 {
196 return pio - lpcdev->io_host->io_start + lpcdev->io_host->hw_start;
197 }
198
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206
207 static u32 hisi_lpc_comm_in(void *hostdata, unsigned long pio, size_t dwidth)
208 {
209 struct hisi_lpc_dev *lpcdev = hostdata;
210 struct lpc_cycle_para iopara;
211 unsigned long addr;
212 u32 rd_data = 0;
213 int ret;
214
215 if (!lpcdev || !dwidth || dwidth > LPC_MAX_DWIDTH)
216 return ~0;
217
218 addr = hisi_lpc_pio_to_addr(lpcdev, pio);
219
220 iopara.opflags = FG_INCRADDR_LPC;
221 iopara.csize = dwidth;
222
223 ret = hisi_lpc_target_in(lpcdev, &iopara, addr,
224 (unsigned char *)&rd_data, dwidth);
225 if (ret)
226 return ~0;
227
228 return le32_to_cpu(rd_data);
229 }
230
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239
240 static void hisi_lpc_comm_out(void *hostdata, unsigned long pio,
241 u32 val, size_t dwidth)
242 {
243 struct hisi_lpc_dev *lpcdev = hostdata;
244 struct lpc_cycle_para iopara;
245 const unsigned char *buf;
246 unsigned long addr;
247
248 if (!lpcdev || !dwidth || dwidth > LPC_MAX_DWIDTH)
249 return;
250
251 val = cpu_to_le32(val);
252
253 buf = (const unsigned char *)&val;
254 addr = hisi_lpc_pio_to_addr(lpcdev, pio);
255
256 iopara.opflags = FG_INCRADDR_LPC;
257 iopara.csize = dwidth;
258
259 hisi_lpc_target_out(lpcdev, &iopara, addr, buf, dwidth);
260 }
261
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272
273 static u32 hisi_lpc_comm_ins(void *hostdata, unsigned long pio, void *buffer,
274 size_t dwidth, unsigned int count)
275 {
276 struct hisi_lpc_dev *lpcdev = hostdata;
277 unsigned char *buf = buffer;
278 struct lpc_cycle_para iopara;
279 unsigned long addr;
280
281 if (!lpcdev || !buf || !count || !dwidth || dwidth > LPC_MAX_DWIDTH)
282 return -EINVAL;
283
284 iopara.opflags = 0;
285 if (dwidth > 1)
286 iopara.opflags |= FG_INCRADDR_LPC;
287 iopara.csize = dwidth;
288
289 addr = hisi_lpc_pio_to_addr(lpcdev, pio);
290
291 do {
292 int ret;
293
294 ret = hisi_lpc_target_in(lpcdev, &iopara, addr, buf, dwidth);
295 if (ret)
296 return ret;
297 buf += dwidth;
298 } while (--count);
299
300 return 0;
301 }
302
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310
311 static void hisi_lpc_comm_outs(void *hostdata, unsigned long pio,
312 const void *buffer, size_t dwidth,
313 unsigned int count)
314 {
315 struct hisi_lpc_dev *lpcdev = hostdata;
316 struct lpc_cycle_para iopara;
317 const unsigned char *buf = buffer;
318 unsigned long addr;
319
320 if (!lpcdev || !buf || !count || !dwidth || dwidth > LPC_MAX_DWIDTH)
321 return;
322
323 iopara.opflags = 0;
324 if (dwidth > 1)
325 iopara.opflags |= FG_INCRADDR_LPC;
326 iopara.csize = dwidth;
327
328 addr = hisi_lpc_pio_to_addr(lpcdev, pio);
329 do {
330 if (hisi_lpc_target_out(lpcdev, &iopara, addr, buf, dwidth))
331 break;
332 buf += dwidth;
333 } while (--count);
334 }
335
336 static const struct logic_pio_host_ops hisi_lpc_ops = {
337 .in = hisi_lpc_comm_in,
338 .out = hisi_lpc_comm_out,
339 .ins = hisi_lpc_comm_ins,
340 .outs = hisi_lpc_comm_outs,
341 };
342
343 #ifdef CONFIG_ACPI
344 static int hisi_lpc_acpi_xlat_io_res(struct acpi_device *adev,
345 struct acpi_device *host,
346 struct resource *res)
347 {
348 unsigned long sys_port;
349 resource_size_t len = resource_size(res);
350
351 sys_port = logic_pio_trans_hwaddr(&host->fwnode, res->start, len);
352 if (sys_port == ~0UL)
353 return -EFAULT;
354
355 res->start = sys_port;
356 res->end = sys_port + len;
357
358 return 0;
359 }
360
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373
374 static int hisi_lpc_acpi_set_io_res(struct device *child,
375 struct device *hostdev,
376 const struct resource **res, int *num_res)
377 {
378 struct acpi_device *adev;
379 struct acpi_device *host;
380 struct resource_entry *rentry;
381 LIST_HEAD(resource_list);
382 struct resource *resources;
383 int count;
384 int i;
385
386 if (!child || !hostdev)
387 return -EINVAL;
388
389 host = to_acpi_device(hostdev);
390 adev = to_acpi_device(child);
391
392 if (!adev->status.present) {
393 dev_dbg(child, "device is not present\n");
394 return -EIO;
395 }
396
397 if (acpi_device_enumerated(adev)) {
398 dev_dbg(child, "has been enumerated\n");
399 return -EIO;
400 }
401
402
403
404
405
406
407 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
408 if (count <= 0) {
409 dev_dbg(child, "failed to get resources\n");
410 return count ? count : -EIO;
411 }
412
413 resources = devm_kcalloc(hostdev, count, sizeof(*resources),
414 GFP_KERNEL);
415 if (!resources) {
416 dev_warn(hostdev, "could not allocate memory for %d resources\n",
417 count);
418 acpi_dev_free_resource_list(&resource_list);
419 return -ENOMEM;
420 }
421 count = 0;
422 list_for_each_entry(rentry, &resource_list, node)
423 resources[count++] = *rentry->res;
424
425 acpi_dev_free_resource_list(&resource_list);
426
427
428 for (i = 0; i < count; i++) {
429 int ret;
430
431 if (!(resources[i].flags & IORESOURCE_IO))
432 continue;
433 ret = hisi_lpc_acpi_xlat_io_res(adev, host, &resources[i]);
434 if (ret) {
435 dev_err(child, "translate IO range %pR failed (%d)\n",
436 &resources[i], ret);
437 return ret;
438 }
439 }
440 *res = resources;
441 *num_res = count;
442
443 return 0;
444 }
445
446 static int hisi_lpc_acpi_remove_subdev(struct device *dev, void *unused)
447 {
448 platform_device_unregister(to_platform_device(dev));
449 return 0;
450 }
451
452 struct hisi_lpc_acpi_cell {
453 const char *hid;
454 const char *name;
455 void *pdata;
456 size_t pdata_size;
457 };
458
459 static void hisi_lpc_acpi_remove(struct device *hostdev)
460 {
461 struct acpi_device *adev = ACPI_COMPANION(hostdev);
462 struct acpi_device *child;
463
464 device_for_each_child(hostdev, NULL, hisi_lpc_acpi_remove_subdev);
465
466 list_for_each_entry(child, &adev->children, node)
467 acpi_device_clear_enumerated(child);
468 }
469
470
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474
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477
478
479
480 static int hisi_lpc_acpi_probe(struct device *hostdev)
481 {
482 struct acpi_device *adev = ACPI_COMPANION(hostdev);
483 struct acpi_device *child;
484 int ret;
485
486
487 list_for_each_entry(child, &adev->children, node) {
488 const char *hid = acpi_device_hid(child);
489 const struct hisi_lpc_acpi_cell *cell;
490 struct platform_device *pdev;
491 const struct resource *res;
492 bool found = false;
493 int num_res;
494
495 ret = hisi_lpc_acpi_set_io_res(&child->dev, &adev->dev, &res,
496 &num_res);
497 if (ret) {
498 dev_warn(hostdev, "set resource fail (%d)\n", ret);
499 goto fail;
500 }
501
502 cell = (struct hisi_lpc_acpi_cell []){
503
504 {
505 .hid = "IPI0001",
506 .name = "hisi-lpc-ipmi",
507 },
508
509 {
510 .hid = "HISI1031",
511 .name = "serial8250",
512 .pdata = (struct plat_serial8250_port []) {
513 {
514 .iobase = res->start,
515 .uartclk = 1843200,
516 .iotype = UPIO_PORT,
517 .flags = UPF_BOOT_AUTOCONF,
518 },
519 {}
520 },
521 .pdata_size = 2 *
522 sizeof(struct plat_serial8250_port),
523 },
524 {}
525 };
526
527 for (; cell && cell->name; cell++) {
528 if (!strcmp(cell->hid, hid)) {
529 found = true;
530 break;
531 }
532 }
533
534 if (!found) {
535 dev_warn(hostdev,
536 "could not find cell for child device (%s), discarding\n",
537 hid);
538 continue;
539 }
540
541 pdev = platform_device_alloc(cell->name, PLATFORM_DEVID_AUTO);
542 if (!pdev) {
543 ret = -ENOMEM;
544 goto fail;
545 }
546
547 pdev->dev.parent = hostdev;
548 ACPI_COMPANION_SET(&pdev->dev, child);
549
550 ret = platform_device_add_resources(pdev, res, num_res);
551 if (ret)
552 goto fail;
553
554 ret = platform_device_add_data(pdev, cell->pdata,
555 cell->pdata_size);
556 if (ret)
557 goto fail;
558
559 ret = platform_device_add(pdev);
560 if (ret)
561 goto fail;
562
563 acpi_device_set_enumerated(child);
564 }
565
566 return 0;
567
568 fail:
569 hisi_lpc_acpi_remove(hostdev);
570 return ret;
571 }
572
573 static const struct acpi_device_id hisi_lpc_acpi_match[] = {
574 {"HISI0191"},
575 {}
576 };
577 #else
578 static int hisi_lpc_acpi_probe(struct device *dev)
579 {
580 return -ENODEV;
581 }
582
583 static void hisi_lpc_acpi_remove(struct device *hostdev)
584 {
585 }
586 #endif
587
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593
594
595 static int hisi_lpc_probe(struct platform_device *pdev)
596 {
597 struct device *dev = &pdev->dev;
598 struct acpi_device *acpi_device = ACPI_COMPANION(dev);
599 struct logic_pio_hwaddr *range;
600 struct hisi_lpc_dev *lpcdev;
601 resource_size_t io_end;
602 struct resource *res;
603 int ret;
604
605 lpcdev = devm_kzalloc(dev, sizeof(*lpcdev), GFP_KERNEL);
606 if (!lpcdev)
607 return -ENOMEM;
608
609 spin_lock_init(&lpcdev->cycle_lock);
610
611 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
612 lpcdev->membase = devm_ioremap_resource(dev, res);
613 if (IS_ERR(lpcdev->membase))
614 return PTR_ERR(lpcdev->membase);
615
616 range = devm_kzalloc(dev, sizeof(*range), GFP_KERNEL);
617 if (!range)
618 return -ENOMEM;
619
620 range->fwnode = dev->fwnode;
621 range->flags = LOGIC_PIO_INDIRECT;
622 range->size = PIO_INDIRECT_SIZE;
623 range->hostdata = lpcdev;
624 range->ops = &hisi_lpc_ops;
625 lpcdev->io_host = range;
626
627 ret = logic_pio_register_range(range);
628 if (ret) {
629 dev_err(dev, "register IO range failed (%d)!\n", ret);
630 return ret;
631 }
632
633
634 if (acpi_device)
635 ret = hisi_lpc_acpi_probe(dev);
636 else
637 ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
638 if (ret) {
639 logic_pio_unregister_range(range);
640 return ret;
641 }
642
643 dev_set_drvdata(dev, lpcdev);
644
645 io_end = lpcdev->io_host->io_start + lpcdev->io_host->size;
646 dev_info(dev, "registered range [%pa - %pa]\n",
647 &lpcdev->io_host->io_start, &io_end);
648
649 return ret;
650 }
651
652 static int hisi_lpc_remove(struct platform_device *pdev)
653 {
654 struct device *dev = &pdev->dev;
655 struct acpi_device *acpi_device = ACPI_COMPANION(dev);
656 struct hisi_lpc_dev *lpcdev = dev_get_drvdata(dev);
657 struct logic_pio_hwaddr *range = lpcdev->io_host;
658
659 if (acpi_device)
660 hisi_lpc_acpi_remove(dev);
661 else
662 of_platform_depopulate(dev);
663
664 logic_pio_unregister_range(range);
665
666 return 0;
667 }
668
669 static const struct of_device_id hisi_lpc_of_match[] = {
670 { .compatible = "hisilicon,hip06-lpc", },
671 { .compatible = "hisilicon,hip07-lpc", },
672 {}
673 };
674
675 static struct platform_driver hisi_lpc_driver = {
676 .driver = {
677 .name = DRV_NAME,
678 .of_match_table = hisi_lpc_of_match,
679 .acpi_match_table = ACPI_PTR(hisi_lpc_acpi_match),
680 },
681 .probe = hisi_lpc_probe,
682 .remove = hisi_lpc_remove,
683 };
684 builtin_platform_driver(hisi_lpc_driver);