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44127b77 | 1 | /* |
856c7ccb | 2 | * Copyright (C) 2014-2017 Broadcom |
44127b77 FF |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/init.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/sysfs.h> | |
20 | #include <linux/io.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/device.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/of.h> | |
25 | #include <linux/bitops.h> | |
203bb85e | 26 | #include <linux/pm.h> |
9eb60880 DB |
27 | #include <linux/kernel.h> |
28 | #include <linux/kdebug.h> | |
29 | #include <linux/notifier.h> | |
44127b77 | 30 | |
c400d5eb FF |
31 | #ifdef CONFIG_MIPS |
32 | #include <asm/traps.h> | |
33 | #endif | |
34 | ||
44127b77 | 35 | #define ARB_ERR_CAP_CLEAR (1 << 0) |
44127b77 FF |
36 | #define ARB_ERR_CAP_STATUS_TIMEOUT (1 << 12) |
37 | #define ARB_ERR_CAP_STATUS_TEA (1 << 11) | |
44127b77 FF |
38 | #define ARB_ERR_CAP_STATUS_WRITE (1 << 1) |
39 | #define ARB_ERR_CAP_STATUS_VALID (1 << 0) | |
f8083587 KC |
40 | |
41 | enum { | |
42 | ARB_TIMER, | |
43 | ARB_ERR_CAP_CLR, | |
44 | ARB_ERR_CAP_HI_ADDR, | |
45 | ARB_ERR_CAP_ADDR, | |
f8083587 KC |
46 | ARB_ERR_CAP_STATUS, |
47 | ARB_ERR_CAP_MASTER, | |
48 | }; | |
49 | ||
d1d67868 KC |
50 | static const int gisb_offsets_bcm7038[] = { |
51 | [ARB_TIMER] = 0x00c, | |
52 | [ARB_ERR_CAP_CLR] = 0x0c4, | |
53 | [ARB_ERR_CAP_HI_ADDR] = -1, | |
54 | [ARB_ERR_CAP_ADDR] = 0x0c8, | |
d1d67868 KC |
55 | [ARB_ERR_CAP_STATUS] = 0x0d0, |
56 | [ARB_ERR_CAP_MASTER] = -1, | |
57 | }; | |
58 | ||
d523e0cf DB |
59 | static const int gisb_offsets_bcm7278[] = { |
60 | [ARB_TIMER] = 0x008, | |
61 | [ARB_ERR_CAP_CLR] = 0x7f8, | |
62 | [ARB_ERR_CAP_HI_ADDR] = -1, | |
63 | [ARB_ERR_CAP_ADDR] = 0x7e0, | |
64 | [ARB_ERR_CAP_STATUS] = 0x7f0, | |
65 | [ARB_ERR_CAP_MASTER] = 0x7f4, | |
66 | }; | |
67 | ||
d1d67868 KC |
68 | static const int gisb_offsets_bcm7400[] = { |
69 | [ARB_TIMER] = 0x00c, | |
70 | [ARB_ERR_CAP_CLR] = 0x0c8, | |
71 | [ARB_ERR_CAP_HI_ADDR] = -1, | |
72 | [ARB_ERR_CAP_ADDR] = 0x0cc, | |
d1d67868 KC |
73 | [ARB_ERR_CAP_STATUS] = 0x0d4, |
74 | [ARB_ERR_CAP_MASTER] = 0x0d8, | |
75 | }; | |
76 | ||
77 | static const int gisb_offsets_bcm7435[] = { | |
78 | [ARB_TIMER] = 0x00c, | |
79 | [ARB_ERR_CAP_CLR] = 0x168, | |
80 | [ARB_ERR_CAP_HI_ADDR] = -1, | |
81 | [ARB_ERR_CAP_ADDR] = 0x16c, | |
d1d67868 KC |
82 | [ARB_ERR_CAP_STATUS] = 0x174, |
83 | [ARB_ERR_CAP_MASTER] = 0x178, | |
84 | }; | |
85 | ||
f8083587 KC |
86 | static const int gisb_offsets_bcm7445[] = { |
87 | [ARB_TIMER] = 0x008, | |
88 | [ARB_ERR_CAP_CLR] = 0x7e4, | |
89 | [ARB_ERR_CAP_HI_ADDR] = 0x7e8, | |
90 | [ARB_ERR_CAP_ADDR] = 0x7ec, | |
f8083587 KC |
91 | [ARB_ERR_CAP_STATUS] = 0x7f4, |
92 | [ARB_ERR_CAP_MASTER] = 0x7f8, | |
93 | }; | |
44127b77 FF |
94 | |
95 | struct brcmstb_gisb_arb_device { | |
96 | void __iomem *base; | |
f8083587 | 97 | const int *gisb_offsets; |
fbf4e262 | 98 | bool big_endian; |
44127b77 FF |
99 | struct mutex lock; |
100 | struct list_head next; | |
101 | u32 valid_mask; | |
102 | const char *master_names[sizeof(u32) * BITS_PER_BYTE]; | |
203bb85e | 103 | u32 saved_timeout; |
44127b77 FF |
104 | }; |
105 | ||
106 | static LIST_HEAD(brcmstb_gisb_arb_device_list); | |
107 | ||
2b53eadc KC |
108 | static u32 gisb_read(struct brcmstb_gisb_arb_device *gdev, int reg) |
109 | { | |
f8083587 KC |
110 | int offset = gdev->gisb_offsets[reg]; |
111 | ||
0c2aa0e4 DB |
112 | if (offset < 0) { |
113 | /* return 1 if the hardware doesn't have ARB_ERR_CAP_MASTER */ | |
114 | if (reg == ARB_ERR_CAP_MASTER) | |
115 | return 1; | |
116 | else | |
117 | return 0; | |
118 | } | |
f8083587 | 119 | |
fbf4e262 KC |
120 | if (gdev->big_endian) |
121 | return ioread32be(gdev->base + offset); | |
122 | else | |
123 | return ioread32(gdev->base + offset); | |
2b53eadc KC |
124 | } |
125 | ||
0c2aa0e4 DB |
126 | static u64 gisb_read_address(struct brcmstb_gisb_arb_device *gdev) |
127 | { | |
128 | u64 value; | |
129 | ||
130 | value = gisb_read(gdev, ARB_ERR_CAP_ADDR); | |
131 | value |= (u64)gisb_read(gdev, ARB_ERR_CAP_HI_ADDR) << 32; | |
132 | ||
133 | return value; | |
134 | } | |
135 | ||
2b53eadc KC |
136 | static void gisb_write(struct brcmstb_gisb_arb_device *gdev, u32 val, int reg) |
137 | { | |
f8083587 KC |
138 | int offset = gdev->gisb_offsets[reg]; |
139 | ||
140 | if (offset == -1) | |
141 | return; | |
fbf4e262 KC |
142 | |
143 | if (gdev->big_endian) | |
856c7ccb | 144 | iowrite32be(val, gdev->base + offset); |
fbf4e262 | 145 | else |
856c7ccb | 146 | iowrite32(val, gdev->base + offset); |
2b53eadc KC |
147 | } |
148 | ||
44127b77 FF |
149 | static ssize_t gisb_arb_get_timeout(struct device *dev, |
150 | struct device_attribute *attr, | |
151 | char *buf) | |
152 | { | |
153 | struct platform_device *pdev = to_platform_device(dev); | |
154 | struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev); | |
155 | u32 timeout; | |
156 | ||
157 | mutex_lock(&gdev->lock); | |
2b53eadc | 158 | timeout = gisb_read(gdev, ARB_TIMER); |
44127b77 FF |
159 | mutex_unlock(&gdev->lock); |
160 | ||
161 | return sprintf(buf, "%d", timeout); | |
162 | } | |
163 | ||
164 | static ssize_t gisb_arb_set_timeout(struct device *dev, | |
165 | struct device_attribute *attr, | |
166 | const char *buf, size_t count) | |
167 | { | |
168 | struct platform_device *pdev = to_platform_device(dev); | |
169 | struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev); | |
170 | int val, ret; | |
171 | ||
172 | ret = kstrtoint(buf, 10, &val); | |
173 | if (ret < 0) | |
174 | return ret; | |
175 | ||
176 | if (val == 0 || val >= 0xffffffff) | |
177 | return -EINVAL; | |
178 | ||
179 | mutex_lock(&gdev->lock); | |
2b53eadc | 180 | gisb_write(gdev, val, ARB_TIMER); |
44127b77 FF |
181 | mutex_unlock(&gdev->lock); |
182 | ||
183 | return count; | |
184 | } | |
185 | ||
186 | static const char * | |
187 | brcmstb_gisb_master_to_str(struct brcmstb_gisb_arb_device *gdev, | |
188 | u32 masters) | |
189 | { | |
190 | u32 mask = gdev->valid_mask & masters; | |
191 | ||
192 | if (hweight_long(mask) != 1) | |
193 | return NULL; | |
194 | ||
195 | return gdev->master_names[ffs(mask) - 1]; | |
196 | } | |
197 | ||
198 | static int brcmstb_gisb_arb_decode_addr(struct brcmstb_gisb_arb_device *gdev, | |
199 | const char *reason) | |
200 | { | |
201 | u32 cap_status; | |
0c2aa0e4 | 202 | u64 arb_addr; |
44127b77 FF |
203 | u32 master; |
204 | const char *m_name; | |
205 | char m_fmt[11]; | |
206 | ||
2b53eadc | 207 | cap_status = gisb_read(gdev, ARB_ERR_CAP_STATUS); |
44127b77 FF |
208 | |
209 | /* Invalid captured address, bail out */ | |
210 | if (!(cap_status & ARB_ERR_CAP_STATUS_VALID)) | |
211 | return 1; | |
212 | ||
213 | /* Read the address and master */ | |
0c2aa0e4 | 214 | arb_addr = gisb_read_address(gdev); |
2b53eadc | 215 | master = gisb_read(gdev, ARB_ERR_CAP_MASTER); |
44127b77 FF |
216 | |
217 | m_name = brcmstb_gisb_master_to_str(gdev, master); | |
218 | if (!m_name) { | |
219 | snprintf(m_fmt, sizeof(m_fmt), "0x%08x", master); | |
220 | m_name = m_fmt; | |
221 | } | |
222 | ||
0c2aa0e4 | 223 | pr_crit("%s: %s at 0x%llx [%c %s], core: %s\n", |
44127b77 FF |
224 | __func__, reason, arb_addr, |
225 | cap_status & ARB_ERR_CAP_STATUS_WRITE ? 'W' : 'R', | |
226 | cap_status & ARB_ERR_CAP_STATUS_TIMEOUT ? "timeout" : "", | |
227 | m_name); | |
228 | ||
229 | /* clear the GISB error */ | |
2b53eadc | 230 | gisb_write(gdev, ARB_ERR_CAP_CLEAR, ARB_ERR_CAP_CLR); |
44127b77 FF |
231 | |
232 | return 0; | |
233 | } | |
234 | ||
c400d5eb FF |
235 | #ifdef CONFIG_MIPS |
236 | static int brcmstb_bus_error_handler(struct pt_regs *regs, int is_fixup) | |
237 | { | |
238 | int ret = 0; | |
239 | struct brcmstb_gisb_arb_device *gdev; | |
240 | u32 cap_status; | |
241 | ||
242 | list_for_each_entry(gdev, &brcmstb_gisb_arb_device_list, next) { | |
243 | cap_status = gisb_read(gdev, ARB_ERR_CAP_STATUS); | |
244 | ||
245 | /* Invalid captured address, bail out */ | |
246 | if (!(cap_status & ARB_ERR_CAP_STATUS_VALID)) { | |
247 | is_fixup = 1; | |
248 | goto out; | |
249 | } | |
250 | ||
251 | ret |= brcmstb_gisb_arb_decode_addr(gdev, "bus error"); | |
252 | } | |
253 | out: | |
254 | return is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL; | |
255 | } | |
256 | #endif | |
257 | ||
44127b77 FF |
258 | static irqreturn_t brcmstb_gisb_timeout_handler(int irq, void *dev_id) |
259 | { | |
260 | brcmstb_gisb_arb_decode_addr(dev_id, "timeout"); | |
261 | ||
262 | return IRQ_HANDLED; | |
263 | } | |
264 | ||
265 | static irqreturn_t brcmstb_gisb_tea_handler(int irq, void *dev_id) | |
266 | { | |
267 | brcmstb_gisb_arb_decode_addr(dev_id, "target abort"); | |
268 | ||
269 | return IRQ_HANDLED; | |
270 | } | |
271 | ||
9eb60880 DB |
272 | /* |
273 | * Dump out gisb errors on die or panic. | |
274 | */ | |
275 | static int dump_gisb_error(struct notifier_block *self, unsigned long v, | |
276 | void *p); | |
277 | ||
278 | static struct notifier_block gisb_die_notifier = { | |
279 | .notifier_call = dump_gisb_error, | |
280 | }; | |
281 | ||
282 | static struct notifier_block gisb_panic_notifier = { | |
283 | .notifier_call = dump_gisb_error, | |
284 | }; | |
285 | ||
286 | static int dump_gisb_error(struct notifier_block *self, unsigned long v, | |
287 | void *p) | |
288 | { | |
289 | struct brcmstb_gisb_arb_device *gdev; | |
290 | const char *reason = "panic"; | |
291 | ||
292 | if (self == &gisb_die_notifier) | |
293 | reason = "die"; | |
294 | ||
295 | /* iterate over each GISB arb registered handlers */ | |
296 | list_for_each_entry(gdev, &brcmstb_gisb_arb_device_list, next) | |
297 | brcmstb_gisb_arb_decode_addr(gdev, reason); | |
298 | ||
299 | return NOTIFY_DONE; | |
300 | } | |
301 | ||
44127b77 FF |
302 | static DEVICE_ATTR(gisb_arb_timeout, S_IWUSR | S_IRUGO, |
303 | gisb_arb_get_timeout, gisb_arb_set_timeout); | |
304 | ||
305 | static struct attribute *gisb_arb_sysfs_attrs[] = { | |
306 | &dev_attr_gisb_arb_timeout.attr, | |
307 | NULL, | |
308 | }; | |
309 | ||
310 | static struct attribute_group gisb_arb_sysfs_attr_group = { | |
311 | .attrs = gisb_arb_sysfs_attrs, | |
312 | }; | |
313 | ||
d1d67868 KC |
314 | static const struct of_device_id brcmstb_gisb_arb_of_match[] = { |
315 | { .compatible = "brcm,gisb-arb", .data = gisb_offsets_bcm7445 }, | |
316 | { .compatible = "brcm,bcm7445-gisb-arb", .data = gisb_offsets_bcm7445 }, | |
317 | { .compatible = "brcm,bcm7435-gisb-arb", .data = gisb_offsets_bcm7435 }, | |
318 | { .compatible = "brcm,bcm7400-gisb-arb", .data = gisb_offsets_bcm7400 }, | |
d523e0cf | 319 | { .compatible = "brcm,bcm7278-gisb-arb", .data = gisb_offsets_bcm7278 }, |
d1d67868 KC |
320 | { .compatible = "brcm,bcm7038-gisb-arb", .data = gisb_offsets_bcm7038 }, |
321 | { }, | |
322 | }; | |
323 | ||
2e8a29a1 | 324 | static int __init brcmstb_gisb_arb_probe(struct platform_device *pdev) |
44127b77 FF |
325 | { |
326 | struct device_node *dn = pdev->dev.of_node; | |
327 | struct brcmstb_gisb_arb_device *gdev; | |
d1d67868 | 328 | const struct of_device_id *of_id; |
44127b77 FF |
329 | struct resource *r; |
330 | int err, timeout_irq, tea_irq; | |
331 | unsigned int num_masters, j = 0; | |
332 | int i, first, last; | |
333 | ||
334 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
335 | timeout_irq = platform_get_irq(pdev, 0); | |
336 | tea_irq = platform_get_irq(pdev, 1); | |
337 | ||
338 | gdev = devm_kzalloc(&pdev->dev, sizeof(*gdev), GFP_KERNEL); | |
339 | if (!gdev) | |
340 | return -ENOMEM; | |
341 | ||
342 | mutex_init(&gdev->lock); | |
343 | INIT_LIST_HEAD(&gdev->next); | |
344 | ||
c9d53c0f JH |
345 | gdev->base = devm_ioremap_resource(&pdev->dev, r); |
346 | if (IS_ERR(gdev->base)) | |
347 | return PTR_ERR(gdev->base); | |
44127b77 | 348 | |
d1d67868 KC |
349 | of_id = of_match_node(brcmstb_gisb_arb_of_match, dn); |
350 | if (!of_id) { | |
351 | pr_err("failed to look up compatible string\n"); | |
352 | return -EINVAL; | |
353 | } | |
354 | gdev->gisb_offsets = of_id->data; | |
fbf4e262 | 355 | gdev->big_endian = of_device_is_big_endian(dn); |
f8083587 | 356 | |
44127b77 FF |
357 | err = devm_request_irq(&pdev->dev, timeout_irq, |
358 | brcmstb_gisb_timeout_handler, 0, pdev->name, | |
359 | gdev); | |
360 | if (err < 0) | |
361 | return err; | |
362 | ||
363 | err = devm_request_irq(&pdev->dev, tea_irq, | |
364 | brcmstb_gisb_tea_handler, 0, pdev->name, | |
365 | gdev); | |
366 | if (err < 0) | |
367 | return err; | |
368 | ||
369 | /* If we do not have a valid mask, assume all masters are enabled */ | |
370 | if (of_property_read_u32(dn, "brcm,gisb-arb-master-mask", | |
371 | &gdev->valid_mask)) | |
372 | gdev->valid_mask = 0xffffffff; | |
373 | ||
374 | /* Proceed with reading the litteral names if we agree on the | |
375 | * number of masters | |
376 | */ | |
377 | num_masters = of_property_count_strings(dn, | |
378 | "brcm,gisb-arb-master-names"); | |
379 | if (hweight_long(gdev->valid_mask) == num_masters) { | |
380 | first = ffs(gdev->valid_mask) - 1; | |
381 | last = fls(gdev->valid_mask) - 1; | |
382 | ||
383 | for (i = first; i < last; i++) { | |
384 | if (!(gdev->valid_mask & BIT(i))) | |
385 | continue; | |
386 | ||
387 | of_property_read_string_index(dn, | |
388 | "brcm,gisb-arb-master-names", j, | |
389 | &gdev->master_names[i]); | |
390 | j++; | |
391 | } | |
392 | } | |
393 | ||
394 | err = sysfs_create_group(&pdev->dev.kobj, &gisb_arb_sysfs_attr_group); | |
395 | if (err) | |
396 | return err; | |
397 | ||
398 | platform_set_drvdata(pdev, gdev); | |
399 | ||
400 | list_add_tail(&gdev->next, &brcmstb_gisb_arb_device_list); | |
401 | ||
c400d5eb FF |
402 | #ifdef CONFIG_MIPS |
403 | board_be_handler = brcmstb_bus_error_handler; | |
404 | #endif | |
f1bee783 | 405 | |
9eb60880 DB |
406 | if (list_is_singular(&brcmstb_gisb_arb_device_list)) { |
407 | register_die_notifier(&gisb_die_notifier); | |
408 | atomic_notifier_chain_register(&panic_notifier_list, | |
409 | &gisb_panic_notifier); | |
410 | } | |
411 | ||
44127b77 FF |
412 | dev_info(&pdev->dev, "registered mem: %p, irqs: %d, %d\n", |
413 | gdev->base, timeout_irq, tea_irq); | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
203bb85e FF |
418 | #ifdef CONFIG_PM_SLEEP |
419 | static int brcmstb_gisb_arb_suspend(struct device *dev) | |
420 | { | |
421 | struct platform_device *pdev = to_platform_device(dev); | |
422 | struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev); | |
423 | ||
71354661 | 424 | gdev->saved_timeout = gisb_read(gdev, ARB_TIMER); |
203bb85e FF |
425 | |
426 | return 0; | |
427 | } | |
428 | ||
429 | /* Make sure we provide the same timeout value that was configured before, and | |
430 | * do this before the GISB timeout interrupt handler has any chance to run. | |
431 | */ | |
432 | static int brcmstb_gisb_arb_resume_noirq(struct device *dev) | |
433 | { | |
434 | struct platform_device *pdev = to_platform_device(dev); | |
435 | struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev); | |
436 | ||
71354661 | 437 | gisb_write(gdev, gdev->saved_timeout, ARB_TIMER); |
203bb85e FF |
438 | |
439 | return 0; | |
440 | } | |
441 | #else | |
442 | #define brcmstb_gisb_arb_suspend NULL | |
443 | #define brcmstb_gisb_arb_resume_noirq NULL | |
444 | #endif | |
445 | ||
446 | static const struct dev_pm_ops brcmstb_gisb_arb_pm_ops = { | |
447 | .suspend = brcmstb_gisb_arb_suspend, | |
448 | .resume_noirq = brcmstb_gisb_arb_resume_noirq, | |
449 | }; | |
450 | ||
44127b77 | 451 | static struct platform_driver brcmstb_gisb_arb_driver = { |
44127b77 FF |
452 | .driver = { |
453 | .name = "brcm-gisb-arb", | |
44127b77 | 454 | .of_match_table = brcmstb_gisb_arb_of_match, |
203bb85e | 455 | .pm = &brcmstb_gisb_arb_pm_ops, |
44127b77 FF |
456 | }, |
457 | }; | |
458 | ||
459 | static int __init brcm_gisb_driver_init(void) | |
460 | { | |
2e8a29a1 FF |
461 | return platform_driver_probe(&brcmstb_gisb_arb_driver, |
462 | brcmstb_gisb_arb_probe); | |
44127b77 FF |
463 | } |
464 | ||
465 | module_init(brcm_gisb_driver_init); |