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44127b77 FF |
1 | /* |
2 | * Copyright (C) 2014 Broadcom Corporation | |
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> |
44127b77 | 27 | |
dd1d78a1 | 28 | #ifdef CONFIG_ARM |
44127b77 FF |
29 | #include <asm/bug.h> |
30 | #include <asm/signal.h> | |
dd1d78a1 | 31 | #endif |
44127b77 | 32 | |
44127b77 | 33 | #define ARB_ERR_CAP_CLEAR (1 << 0) |
44127b77 FF |
34 | #define ARB_ERR_CAP_STATUS_TIMEOUT (1 << 12) |
35 | #define ARB_ERR_CAP_STATUS_TEA (1 << 11) | |
36 | #define ARB_ERR_CAP_STATUS_BS_SHIFT (1 << 2) | |
37 | #define ARB_ERR_CAP_STATUS_BS_MASK 0x3c | |
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, | |
46 | ARB_ERR_CAP_DATA, | |
47 | ARB_ERR_CAP_STATUS, | |
48 | ARB_ERR_CAP_MASTER, | |
49 | }; | |
50 | ||
d1d67868 KC |
51 | static const int gisb_offsets_bcm7038[] = { |
52 | [ARB_TIMER] = 0x00c, | |
53 | [ARB_ERR_CAP_CLR] = 0x0c4, | |
54 | [ARB_ERR_CAP_HI_ADDR] = -1, | |
55 | [ARB_ERR_CAP_ADDR] = 0x0c8, | |
56 | [ARB_ERR_CAP_DATA] = 0x0cc, | |
57 | [ARB_ERR_CAP_STATUS] = 0x0d0, | |
58 | [ARB_ERR_CAP_MASTER] = -1, | |
59 | }; | |
60 | ||
61 | static const int gisb_offsets_bcm7400[] = { | |
62 | [ARB_TIMER] = 0x00c, | |
63 | [ARB_ERR_CAP_CLR] = 0x0c8, | |
64 | [ARB_ERR_CAP_HI_ADDR] = -1, | |
65 | [ARB_ERR_CAP_ADDR] = 0x0cc, | |
66 | [ARB_ERR_CAP_DATA] = 0x0d0, | |
67 | [ARB_ERR_CAP_STATUS] = 0x0d4, | |
68 | [ARB_ERR_CAP_MASTER] = 0x0d8, | |
69 | }; | |
70 | ||
71 | static const int gisb_offsets_bcm7435[] = { | |
72 | [ARB_TIMER] = 0x00c, | |
73 | [ARB_ERR_CAP_CLR] = 0x168, | |
74 | [ARB_ERR_CAP_HI_ADDR] = -1, | |
75 | [ARB_ERR_CAP_ADDR] = 0x16c, | |
76 | [ARB_ERR_CAP_DATA] = 0x170, | |
77 | [ARB_ERR_CAP_STATUS] = 0x174, | |
78 | [ARB_ERR_CAP_MASTER] = 0x178, | |
79 | }; | |
80 | ||
f8083587 KC |
81 | static const int gisb_offsets_bcm7445[] = { |
82 | [ARB_TIMER] = 0x008, | |
83 | [ARB_ERR_CAP_CLR] = 0x7e4, | |
84 | [ARB_ERR_CAP_HI_ADDR] = 0x7e8, | |
85 | [ARB_ERR_CAP_ADDR] = 0x7ec, | |
86 | [ARB_ERR_CAP_DATA] = 0x7f0, | |
87 | [ARB_ERR_CAP_STATUS] = 0x7f4, | |
88 | [ARB_ERR_CAP_MASTER] = 0x7f8, | |
89 | }; | |
44127b77 FF |
90 | |
91 | struct brcmstb_gisb_arb_device { | |
92 | void __iomem *base; | |
f8083587 | 93 | const int *gisb_offsets; |
fbf4e262 | 94 | bool big_endian; |
44127b77 FF |
95 | struct mutex lock; |
96 | struct list_head next; | |
97 | u32 valid_mask; | |
98 | const char *master_names[sizeof(u32) * BITS_PER_BYTE]; | |
203bb85e | 99 | u32 saved_timeout; |
44127b77 FF |
100 | }; |
101 | ||
102 | static LIST_HEAD(brcmstb_gisb_arb_device_list); | |
103 | ||
2b53eadc KC |
104 | static u32 gisb_read(struct brcmstb_gisb_arb_device *gdev, int reg) |
105 | { | |
f8083587 KC |
106 | int offset = gdev->gisb_offsets[reg]; |
107 | ||
108 | /* return 1 if the hardware doesn't have ARB_ERR_CAP_MASTER */ | |
109 | if (offset == -1) | |
110 | return 1; | |
111 | ||
fbf4e262 KC |
112 | if (gdev->big_endian) |
113 | return ioread32be(gdev->base + offset); | |
114 | else | |
115 | return ioread32(gdev->base + offset); | |
2b53eadc KC |
116 | } |
117 | ||
118 | static void gisb_write(struct brcmstb_gisb_arb_device *gdev, u32 val, int reg) | |
119 | { | |
f8083587 KC |
120 | int offset = gdev->gisb_offsets[reg]; |
121 | ||
122 | if (offset == -1) | |
123 | return; | |
fbf4e262 KC |
124 | |
125 | if (gdev->big_endian) | |
126 | iowrite32be(val, gdev->base + reg); | |
127 | else | |
128 | iowrite32(val, gdev->base + reg); | |
2b53eadc KC |
129 | } |
130 | ||
44127b77 FF |
131 | static ssize_t gisb_arb_get_timeout(struct device *dev, |
132 | struct device_attribute *attr, | |
133 | char *buf) | |
134 | { | |
135 | struct platform_device *pdev = to_platform_device(dev); | |
136 | struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev); | |
137 | u32 timeout; | |
138 | ||
139 | mutex_lock(&gdev->lock); | |
2b53eadc | 140 | timeout = gisb_read(gdev, ARB_TIMER); |
44127b77 FF |
141 | mutex_unlock(&gdev->lock); |
142 | ||
143 | return sprintf(buf, "%d", timeout); | |
144 | } | |
145 | ||
146 | static ssize_t gisb_arb_set_timeout(struct device *dev, | |
147 | struct device_attribute *attr, | |
148 | const char *buf, size_t count) | |
149 | { | |
150 | struct platform_device *pdev = to_platform_device(dev); | |
151 | struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev); | |
152 | int val, ret; | |
153 | ||
154 | ret = kstrtoint(buf, 10, &val); | |
155 | if (ret < 0) | |
156 | return ret; | |
157 | ||
158 | if (val == 0 || val >= 0xffffffff) | |
159 | return -EINVAL; | |
160 | ||
161 | mutex_lock(&gdev->lock); | |
2b53eadc | 162 | gisb_write(gdev, val, ARB_TIMER); |
44127b77 FF |
163 | mutex_unlock(&gdev->lock); |
164 | ||
165 | return count; | |
166 | } | |
167 | ||
168 | static const char * | |
169 | brcmstb_gisb_master_to_str(struct brcmstb_gisb_arb_device *gdev, | |
170 | u32 masters) | |
171 | { | |
172 | u32 mask = gdev->valid_mask & masters; | |
173 | ||
174 | if (hweight_long(mask) != 1) | |
175 | return NULL; | |
176 | ||
177 | return gdev->master_names[ffs(mask) - 1]; | |
178 | } | |
179 | ||
180 | static int brcmstb_gisb_arb_decode_addr(struct brcmstb_gisb_arb_device *gdev, | |
181 | const char *reason) | |
182 | { | |
183 | u32 cap_status; | |
184 | unsigned long arb_addr; | |
185 | u32 master; | |
186 | const char *m_name; | |
187 | char m_fmt[11]; | |
188 | ||
2b53eadc | 189 | cap_status = gisb_read(gdev, ARB_ERR_CAP_STATUS); |
44127b77 FF |
190 | |
191 | /* Invalid captured address, bail out */ | |
192 | if (!(cap_status & ARB_ERR_CAP_STATUS_VALID)) | |
193 | return 1; | |
194 | ||
195 | /* Read the address and master */ | |
2b53eadc | 196 | arb_addr = gisb_read(gdev, ARB_ERR_CAP_ADDR) & 0xffffffff; |
44127b77 | 197 | #if (IS_ENABLED(CONFIG_PHYS_ADDR_T_64BIT)) |
2b53eadc | 198 | arb_addr |= (u64)gisb_read(gdev, ARB_ERR_CAP_HI_ADDR) << 32; |
44127b77 | 199 | #endif |
2b53eadc | 200 | master = gisb_read(gdev, ARB_ERR_CAP_MASTER); |
44127b77 FF |
201 | |
202 | m_name = brcmstb_gisb_master_to_str(gdev, master); | |
203 | if (!m_name) { | |
204 | snprintf(m_fmt, sizeof(m_fmt), "0x%08x", master); | |
205 | m_name = m_fmt; | |
206 | } | |
207 | ||
208 | pr_crit("%s: %s at 0x%lx [%c %s], core: %s\n", | |
209 | __func__, reason, arb_addr, | |
210 | cap_status & ARB_ERR_CAP_STATUS_WRITE ? 'W' : 'R', | |
211 | cap_status & ARB_ERR_CAP_STATUS_TIMEOUT ? "timeout" : "", | |
212 | m_name); | |
213 | ||
214 | /* clear the GISB error */ | |
2b53eadc | 215 | gisb_write(gdev, ARB_ERR_CAP_CLEAR, ARB_ERR_CAP_CLR); |
44127b77 FF |
216 | |
217 | return 0; | |
218 | } | |
219 | ||
dd1d78a1 | 220 | #ifdef CONFIG_ARM |
44127b77 FF |
221 | static int brcmstb_bus_error_handler(unsigned long addr, unsigned int fsr, |
222 | struct pt_regs *regs) | |
223 | { | |
224 | int ret = 0; | |
225 | struct brcmstb_gisb_arb_device *gdev; | |
226 | ||
227 | /* iterate over each GISB arb registered handlers */ | |
228 | list_for_each_entry(gdev, &brcmstb_gisb_arb_device_list, next) | |
229 | ret |= brcmstb_gisb_arb_decode_addr(gdev, "bus error"); | |
230 | /* | |
231 | * If it was an imprecise abort, then we need to correct the | |
232 | * return address to be _after_ the instruction. | |
233 | */ | |
234 | if (fsr & (1 << 10)) | |
235 | regs->ARM_pc += 4; | |
236 | ||
237 | return ret; | |
238 | } | |
dd1d78a1 | 239 | #endif |
44127b77 FF |
240 | |
241 | static irqreturn_t brcmstb_gisb_timeout_handler(int irq, void *dev_id) | |
242 | { | |
243 | brcmstb_gisb_arb_decode_addr(dev_id, "timeout"); | |
244 | ||
245 | return IRQ_HANDLED; | |
246 | } | |
247 | ||
248 | static irqreturn_t brcmstb_gisb_tea_handler(int irq, void *dev_id) | |
249 | { | |
250 | brcmstb_gisb_arb_decode_addr(dev_id, "target abort"); | |
251 | ||
252 | return IRQ_HANDLED; | |
253 | } | |
254 | ||
255 | static DEVICE_ATTR(gisb_arb_timeout, S_IWUSR | S_IRUGO, | |
256 | gisb_arb_get_timeout, gisb_arb_set_timeout); | |
257 | ||
258 | static struct attribute *gisb_arb_sysfs_attrs[] = { | |
259 | &dev_attr_gisb_arb_timeout.attr, | |
260 | NULL, | |
261 | }; | |
262 | ||
263 | static struct attribute_group gisb_arb_sysfs_attr_group = { | |
264 | .attrs = gisb_arb_sysfs_attrs, | |
265 | }; | |
266 | ||
d1d67868 KC |
267 | static const struct of_device_id brcmstb_gisb_arb_of_match[] = { |
268 | { .compatible = "brcm,gisb-arb", .data = gisb_offsets_bcm7445 }, | |
269 | { .compatible = "brcm,bcm7445-gisb-arb", .data = gisb_offsets_bcm7445 }, | |
270 | { .compatible = "brcm,bcm7435-gisb-arb", .data = gisb_offsets_bcm7435 }, | |
271 | { .compatible = "brcm,bcm7400-gisb-arb", .data = gisb_offsets_bcm7400 }, | |
272 | { .compatible = "brcm,bcm7038-gisb-arb", .data = gisb_offsets_bcm7038 }, | |
273 | { }, | |
274 | }; | |
275 | ||
2e8a29a1 | 276 | static int __init brcmstb_gisb_arb_probe(struct platform_device *pdev) |
44127b77 FF |
277 | { |
278 | struct device_node *dn = pdev->dev.of_node; | |
279 | struct brcmstb_gisb_arb_device *gdev; | |
d1d67868 | 280 | const struct of_device_id *of_id; |
44127b77 FF |
281 | struct resource *r; |
282 | int err, timeout_irq, tea_irq; | |
283 | unsigned int num_masters, j = 0; | |
284 | int i, first, last; | |
285 | ||
286 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
287 | timeout_irq = platform_get_irq(pdev, 0); | |
288 | tea_irq = platform_get_irq(pdev, 1); | |
289 | ||
290 | gdev = devm_kzalloc(&pdev->dev, sizeof(*gdev), GFP_KERNEL); | |
291 | if (!gdev) | |
292 | return -ENOMEM; | |
293 | ||
294 | mutex_init(&gdev->lock); | |
295 | INIT_LIST_HEAD(&gdev->next); | |
296 | ||
c9d53c0f JH |
297 | gdev->base = devm_ioremap_resource(&pdev->dev, r); |
298 | if (IS_ERR(gdev->base)) | |
299 | return PTR_ERR(gdev->base); | |
44127b77 | 300 | |
d1d67868 KC |
301 | of_id = of_match_node(brcmstb_gisb_arb_of_match, dn); |
302 | if (!of_id) { | |
303 | pr_err("failed to look up compatible string\n"); | |
304 | return -EINVAL; | |
305 | } | |
306 | gdev->gisb_offsets = of_id->data; | |
fbf4e262 | 307 | gdev->big_endian = of_device_is_big_endian(dn); |
f8083587 | 308 | |
44127b77 FF |
309 | err = devm_request_irq(&pdev->dev, timeout_irq, |
310 | brcmstb_gisb_timeout_handler, 0, pdev->name, | |
311 | gdev); | |
312 | if (err < 0) | |
313 | return err; | |
314 | ||
315 | err = devm_request_irq(&pdev->dev, tea_irq, | |
316 | brcmstb_gisb_tea_handler, 0, pdev->name, | |
317 | gdev); | |
318 | if (err < 0) | |
319 | return err; | |
320 | ||
321 | /* If we do not have a valid mask, assume all masters are enabled */ | |
322 | if (of_property_read_u32(dn, "brcm,gisb-arb-master-mask", | |
323 | &gdev->valid_mask)) | |
324 | gdev->valid_mask = 0xffffffff; | |
325 | ||
326 | /* Proceed with reading the litteral names if we agree on the | |
327 | * number of masters | |
328 | */ | |
329 | num_masters = of_property_count_strings(dn, | |
330 | "brcm,gisb-arb-master-names"); | |
331 | if (hweight_long(gdev->valid_mask) == num_masters) { | |
332 | first = ffs(gdev->valid_mask) - 1; | |
333 | last = fls(gdev->valid_mask) - 1; | |
334 | ||
335 | for (i = first; i < last; i++) { | |
336 | if (!(gdev->valid_mask & BIT(i))) | |
337 | continue; | |
338 | ||
339 | of_property_read_string_index(dn, | |
340 | "brcm,gisb-arb-master-names", j, | |
341 | &gdev->master_names[i]); | |
342 | j++; | |
343 | } | |
344 | } | |
345 | ||
346 | err = sysfs_create_group(&pdev->dev.kobj, &gisb_arb_sysfs_attr_group); | |
347 | if (err) | |
348 | return err; | |
349 | ||
350 | platform_set_drvdata(pdev, gdev); | |
351 | ||
352 | list_add_tail(&gdev->next, &brcmstb_gisb_arb_device_list); | |
353 | ||
71354661 | 354 | #ifdef CONFIG_ARM |
f1bee783 FF |
355 | hook_fault_code(22, brcmstb_bus_error_handler, SIGBUS, 0, |
356 | "imprecise external abort"); | |
71354661 | 357 | #endif |
f1bee783 | 358 | |
44127b77 FF |
359 | dev_info(&pdev->dev, "registered mem: %p, irqs: %d, %d\n", |
360 | gdev->base, timeout_irq, tea_irq); | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
203bb85e FF |
365 | #ifdef CONFIG_PM_SLEEP |
366 | static int brcmstb_gisb_arb_suspend(struct device *dev) | |
367 | { | |
368 | struct platform_device *pdev = to_platform_device(dev); | |
369 | struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev); | |
370 | ||
71354661 | 371 | gdev->saved_timeout = gisb_read(gdev, ARB_TIMER); |
203bb85e FF |
372 | |
373 | return 0; | |
374 | } | |
375 | ||
376 | /* Make sure we provide the same timeout value that was configured before, and | |
377 | * do this before the GISB timeout interrupt handler has any chance to run. | |
378 | */ | |
379 | static int brcmstb_gisb_arb_resume_noirq(struct device *dev) | |
380 | { | |
381 | struct platform_device *pdev = to_platform_device(dev); | |
382 | struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev); | |
383 | ||
71354661 | 384 | gisb_write(gdev, gdev->saved_timeout, ARB_TIMER); |
203bb85e FF |
385 | |
386 | return 0; | |
387 | } | |
388 | #else | |
389 | #define brcmstb_gisb_arb_suspend NULL | |
390 | #define brcmstb_gisb_arb_resume_noirq NULL | |
391 | #endif | |
392 | ||
393 | static const struct dev_pm_ops brcmstb_gisb_arb_pm_ops = { | |
394 | .suspend = brcmstb_gisb_arb_suspend, | |
395 | .resume_noirq = brcmstb_gisb_arb_resume_noirq, | |
396 | }; | |
397 | ||
44127b77 | 398 | static struct platform_driver brcmstb_gisb_arb_driver = { |
44127b77 FF |
399 | .driver = { |
400 | .name = "brcm-gisb-arb", | |
44127b77 | 401 | .of_match_table = brcmstb_gisb_arb_of_match, |
203bb85e | 402 | .pm = &brcmstb_gisb_arb_pm_ops, |
44127b77 FF |
403 | }, |
404 | }; | |
405 | ||
406 | static int __init brcm_gisb_driver_init(void) | |
407 | { | |
2e8a29a1 FF |
408 | return platform_driver_probe(&brcmstb_gisb_arb_driver, |
409 | brcmstb_gisb_arb_probe); | |
44127b77 FF |
410 | } |
411 | ||
412 | module_init(brcm_gisb_driver_init); |