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Linux 5.1.15
[linux/fpc-iii.git] / drivers / bus / brcmstb_gisb.c
blobf58ff67e97ac966b8682f7f88f549a9d372827d5
1 /*
2 * Copyright (C) 2014-2017 Broadcom
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>
26 #include <linux/pm.h>
27 #include <linux/kernel.h>
28 #include <linux/kdebug.h>
29 #include <linux/notifier.h>
30
31 #ifdef CONFIG_MIPS
32 #include <asm/traps.h>
33 #endif
34
35 #define ARB_ERR_CAP_CLEAR (1 << 0)
36 #define ARB_ERR_CAP_STATUS_TIMEOUT (1 << 12)
37 #define ARB_ERR_CAP_STATUS_TEA (1 << 11)
38 #define ARB_ERR_CAP_STATUS_WRITE (1 << 1)
39 #define ARB_ERR_CAP_STATUS_VALID (1 << 0)
40
41 enum {
42 ARB_TIMER,
43 ARB_ERR_CAP_CLR,
44 ARB_ERR_CAP_HI_ADDR,
45 ARB_ERR_CAP_ADDR,
46 ARB_ERR_CAP_STATUS,
47 ARB_ERR_CAP_MASTER,
48 };
49
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,
55 [ARB_ERR_CAP_STATUS] = 0x0d0,
56 [ARB_ERR_CAP_MASTER] = -1,
57 };
58
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
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,
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,
82 [ARB_ERR_CAP_STATUS] = 0x174,
83 [ARB_ERR_CAP_MASTER] = 0x178,
84 };
85
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,
91 [ARB_ERR_CAP_STATUS] = 0x7f4,
92 [ARB_ERR_CAP_MASTER] = 0x7f8,
93 };
94
95 struct brcmstb_gisb_arb_device {
96 void __iomem *base;
97 const int *gisb_offsets;
98 bool big_endian;
99 struct mutex lock;
100 struct list_head next;
101 u32 valid_mask;
102 const char *master_names[sizeof(u32) * BITS_PER_BYTE];
103 u32 saved_timeout;
104 };
105
106 static LIST_HEAD(brcmstb_gisb_arb_device_list);
107
108 static u32 gisb_read(struct brcmstb_gisb_arb_device *gdev, int reg)
109 {
110 int offset = gdev->gisb_offsets[reg];
111
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 }
119
120 if (gdev->big_endian)
121 return ioread32be(gdev->base + offset);
122 else
123 return ioread32(gdev->base + offset);
124 }
125
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
136 static void gisb_write(struct brcmstb_gisb_arb_device *gdev, u32 val, int reg)
137 {
138 int offset = gdev->gisb_offsets[reg];
139
140 if (offset == -1)
141 return;
142
143 if (gdev->big_endian)
144 iowrite32be(val, gdev->base + offset);
145 else
146 iowrite32(val, gdev->base + offset);
147 }
148
149 static ssize_t gisb_arb_get_timeout(struct device *dev,
150 struct device_attribute *attr,
151 char *buf)
152 {
153 struct brcmstb_gisb_arb_device *gdev = dev_get_drvdata(dev);
154 u32 timeout;
155
156 mutex_lock(&gdev->lock);
157 timeout = gisb_read(gdev, ARB_TIMER);
158 mutex_unlock(&gdev->lock);
159
160 return sprintf(buf, "%d", timeout);
161 }
162
163 static ssize_t gisb_arb_set_timeout(struct device *dev,
164 struct device_attribute *attr,
165 const char *buf, size_t count)
166 {
167 struct brcmstb_gisb_arb_device *gdev = dev_get_drvdata(dev);
168 int val, ret;
169
170 ret = kstrtoint(buf, 10, &val);
171 if (ret < 0)
172 return ret;
173
174 if (val == 0 || val >= 0xffffffff)
175 return -EINVAL;
176
177 mutex_lock(&gdev->lock);
178 gisb_write(gdev, val, ARB_TIMER);
179 mutex_unlock(&gdev->lock);
180
181 return count;
182 }
183
184 static const char *
185 brcmstb_gisb_master_to_str(struct brcmstb_gisb_arb_device *gdev,
186 u32 masters)
187 {
188 u32 mask = gdev->valid_mask & masters;
189
190 if (hweight_long(mask) != 1)
191 return NULL;
192
193 return gdev->master_names[ffs(mask) - 1];
194 }
195
196 static int brcmstb_gisb_arb_decode_addr(struct brcmstb_gisb_arb_device *gdev,
197 const char *reason)
198 {
199 u32 cap_status;
200 u64 arb_addr;
201 u32 master;
202 const char *m_name;
203 char m_fmt[11];
204
205 cap_status = gisb_read(gdev, ARB_ERR_CAP_STATUS);
206
207 /* Invalid captured address, bail out */
208 if (!(cap_status & ARB_ERR_CAP_STATUS_VALID))
209 return 1;
210
211 /* Read the address and master */
212 arb_addr = gisb_read_address(gdev);
213 master = gisb_read(gdev, ARB_ERR_CAP_MASTER);
214
215 m_name = brcmstb_gisb_master_to_str(gdev, master);
216 if (!m_name) {
217 snprintf(m_fmt, sizeof(m_fmt), "0x%08x", master);
218 m_name = m_fmt;
219 }
220
221 pr_crit("%s: %s at 0x%llx [%c %s], core: %s\n",
222 __func__, reason, arb_addr,
223 cap_status & ARB_ERR_CAP_STATUS_WRITE ? 'W' : 'R',
224 cap_status & ARB_ERR_CAP_STATUS_TIMEOUT ? "timeout" : "",
225 m_name);
226
227 /* clear the GISB error */
228 gisb_write(gdev, ARB_ERR_CAP_CLEAR, ARB_ERR_CAP_CLR);
229
230 return 0;
231 }
232
233 #ifdef CONFIG_MIPS
234 static int brcmstb_bus_error_handler(struct pt_regs *regs, int is_fixup)
235 {
236 int ret = 0;
237 struct brcmstb_gisb_arb_device *gdev;
238 u32 cap_status;
239
240 list_for_each_entry(gdev, &brcmstb_gisb_arb_device_list, next) {
241 cap_status = gisb_read(gdev, ARB_ERR_CAP_STATUS);
242
243 /* Invalid captured address, bail out */
244 if (!(cap_status & ARB_ERR_CAP_STATUS_VALID)) {
245 is_fixup = 1;
246 goto out;
247 }
248
249 ret |= brcmstb_gisb_arb_decode_addr(gdev, "bus error");
250 }
251 out:
252 return is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
253 }
254 #endif
255
256 static irqreturn_t brcmstb_gisb_timeout_handler(int irq, void *dev_id)
257 {
258 brcmstb_gisb_arb_decode_addr(dev_id, "timeout");
259
260 return IRQ_HANDLED;
261 }
262
263 static irqreturn_t brcmstb_gisb_tea_handler(int irq, void *dev_id)
264 {
265 brcmstb_gisb_arb_decode_addr(dev_id, "target abort");
266
267 return IRQ_HANDLED;
268 }
269
270 /*
271 * Dump out gisb errors on die or panic.
272 */
273 static int dump_gisb_error(struct notifier_block *self, unsigned long v,
274 void *p);
275
276 static struct notifier_block gisb_die_notifier = {
277 .notifier_call = dump_gisb_error,
278 };
279
280 static struct notifier_block gisb_panic_notifier = {
281 .notifier_call = dump_gisb_error,
282 };
283
284 static int dump_gisb_error(struct notifier_block *self, unsigned long v,
285 void *p)
286 {
287 struct brcmstb_gisb_arb_device *gdev;
288 const char *reason = "panic";
289
290 if (self == &gisb_die_notifier)
291 reason = "die";
292
293 /* iterate over each GISB arb registered handlers */
294 list_for_each_entry(gdev, &brcmstb_gisb_arb_device_list, next)
295 brcmstb_gisb_arb_decode_addr(gdev, reason);
296
297 return NOTIFY_DONE;
298 }
299
300 static DEVICE_ATTR(gisb_arb_timeout, S_IWUSR | S_IRUGO,
301 gisb_arb_get_timeout, gisb_arb_set_timeout);
302
303 static struct attribute *gisb_arb_sysfs_attrs[] = {
304 &dev_attr_gisb_arb_timeout.attr,
305 NULL,
306 };
307
308 static struct attribute_group gisb_arb_sysfs_attr_group = {
309 .attrs = gisb_arb_sysfs_attrs,
310 };
311
312 static const struct of_device_id brcmstb_gisb_arb_of_match[] = {
313 { .compatible = "brcm,gisb-arb", .data = gisb_offsets_bcm7445 },
314 { .compatible = "brcm,bcm7445-gisb-arb", .data = gisb_offsets_bcm7445 },
315 { .compatible = "brcm,bcm7435-gisb-arb", .data = gisb_offsets_bcm7435 },
316 { .compatible = "brcm,bcm7400-gisb-arb", .data = gisb_offsets_bcm7400 },
317 { .compatible = "brcm,bcm7278-gisb-arb", .data = gisb_offsets_bcm7278 },
318 { .compatible = "brcm,bcm7038-gisb-arb", .data = gisb_offsets_bcm7038 },
319 { },
320 };
321
322 static int __init brcmstb_gisb_arb_probe(struct platform_device *pdev)
323 {
324 struct device_node *dn = pdev->dev.of_node;
325 struct brcmstb_gisb_arb_device *gdev;
326 const struct of_device_id *of_id;
327 struct resource *r;
328 int err, timeout_irq, tea_irq;
329 unsigned int num_masters, j = 0;
330 int i, first, last;
331
332 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
333 timeout_irq = platform_get_irq(pdev, 0);
334 tea_irq = platform_get_irq(pdev, 1);
335
336 gdev = devm_kzalloc(&pdev->dev, sizeof(*gdev), GFP_KERNEL);
337 if (!gdev)
338 return -ENOMEM;
339
340 mutex_init(&gdev->lock);
341 INIT_LIST_HEAD(&gdev->next);
342
343 gdev->base = devm_ioremap_resource(&pdev->dev, r);
344 if (IS_ERR(gdev->base))
345 return PTR_ERR(gdev->base);
346
347 of_id = of_match_node(brcmstb_gisb_arb_of_match, dn);
348 if (!of_id) {
349 pr_err("failed to look up compatible string\n");
350 return -EINVAL;
351 }
352 gdev->gisb_offsets = of_id->data;
353 gdev->big_endian = of_device_is_big_endian(dn);
354
355 err = devm_request_irq(&pdev->dev, timeout_irq,
356 brcmstb_gisb_timeout_handler, 0, pdev->name,
357 gdev);
358 if (err < 0)
359 return err;
360
361 err = devm_request_irq(&pdev->dev, tea_irq,
362 brcmstb_gisb_tea_handler, 0, pdev->name,
363 gdev);
364 if (err < 0)
365 return err;
366
367 /* If we do not have a valid mask, assume all masters are enabled */
368 if (of_property_read_u32(dn, "brcm,gisb-arb-master-mask",
369 &gdev->valid_mask))
370 gdev->valid_mask = 0xffffffff;
371
372 /* Proceed with reading the litteral names if we agree on the
373 * number of masters
374 */
375 num_masters = of_property_count_strings(dn,
376 "brcm,gisb-arb-master-names");
377 if (hweight_long(gdev->valid_mask) == num_masters) {
378 first = ffs(gdev->valid_mask) - 1;
379 last = fls(gdev->valid_mask) - 1;
380
381 for (i = first; i < last; i++) {
382 if (!(gdev->valid_mask & BIT(i)))
383 continue;
384
385 of_property_read_string_index(dn,
386 "brcm,gisb-arb-master-names", j,
387 &gdev->master_names[i]);
388 j++;
389 }
390 }
391
392 err = sysfs_create_group(&pdev->dev.kobj, &gisb_arb_sysfs_attr_group);
393 if (err)
394 return err;
395
396 platform_set_drvdata(pdev, gdev);
397
398 list_add_tail(&gdev->next, &brcmstb_gisb_arb_device_list);
399
400 #ifdef CONFIG_MIPS
401 board_be_handler = brcmstb_bus_error_handler;
402 #endif
403
404 if (list_is_singular(&brcmstb_gisb_arb_device_list)) {
405 register_die_notifier(&gisb_die_notifier);
406 atomic_notifier_chain_register(&panic_notifier_list,
407 &gisb_panic_notifier);
408 }
409
410 dev_info(&pdev->dev, "registered mem: %p, irqs: %d, %d\n",
411 gdev->base, timeout_irq, tea_irq);
412
413 return 0;
414 }
415
416 #ifdef CONFIG_PM_SLEEP
417 static int brcmstb_gisb_arb_suspend(struct device *dev)
418 {
419 struct brcmstb_gisb_arb_device *gdev = dev_get_drvdata(dev);
420
421 gdev->saved_timeout = gisb_read(gdev, ARB_TIMER);
422
423 return 0;
424 }
425
426 /* Make sure we provide the same timeout value that was configured before, and
427 * do this before the GISB timeout interrupt handler has any chance to run.
428 */
429 static int brcmstb_gisb_arb_resume_noirq(struct device *dev)
430 {
431 struct brcmstb_gisb_arb_device *gdev = dev_get_drvdata(dev);
432
433 gisb_write(gdev, gdev->saved_timeout, ARB_TIMER);
434
435 return 0;
436 }
437 #else
438 #define brcmstb_gisb_arb_suspend NULL
439 #define brcmstb_gisb_arb_resume_noirq NULL
440 #endif
441
442 static const struct dev_pm_ops brcmstb_gisb_arb_pm_ops = {
443 .suspend = brcmstb_gisb_arb_suspend,
444 .resume_noirq = brcmstb_gisb_arb_resume_noirq,
445 };
446
447 static struct platform_driver brcmstb_gisb_arb_driver = {
448 .driver = {
449 .name = "brcm-gisb-arb",
450 .of_match_table = brcmstb_gisb_arb_of_match,
451 .pm = &brcmstb_gisb_arb_pm_ops,
452 },
453 };
454
455 static int __init brcm_gisb_driver_init(void)
456 {
457 return platform_driver_probe(&brcmstb_gisb_arb_driver,
458 brcmstb_gisb_arb_probe);
459 }
460
461 module_init(brcm_gisb_driver_init);
Linux with added FPC-III support