blob: 738612c45266c1b11f1319ae95275dcc881b8590 [file] [log] [blame]
Florian Fainelli44127b72014-05-19 13:05:59 -07001/*
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>
Florian Fainelli203bb852014-09-18 12:37:14 -070026#include <linux/pm.h>
Florian Fainelli44127b72014-05-19 13:05:59 -070027
Kevin Cernekeedd1d78a2014-11-25 16:49:49 -080028#ifdef CONFIG_ARM
Florian Fainelli44127b72014-05-19 13:05:59 -070029#include <asm/bug.h>
30#include <asm/signal.h>
Kevin Cernekeedd1d78a2014-11-25 16:49:49 -080031#endif
Florian Fainelli44127b72014-05-19 13:05:59 -070032
Florian Fainelli44127b72014-05-19 13:05:59 -070033#define ARB_ERR_CAP_CLEAR (1 << 0)
Florian Fainelli44127b72014-05-19 13:05:59 -070034#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)
Kevin Cernekeef8083582014-11-25 16:49:51 -080040
41enum {
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
Kevin Cernekeed1d67862014-11-25 16:49:52 -080051static 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
61static 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
71static 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
Kevin Cernekeef8083582014-11-25 16:49:51 -080081static 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};
Florian Fainelli44127b72014-05-19 13:05:59 -070090
91struct brcmstb_gisb_arb_device {
92 void __iomem *base;
Kevin Cernekeef8083582014-11-25 16:49:51 -080093 const int *gisb_offsets;
Florian Fainelli44127b72014-05-19 13:05:59 -070094 struct mutex lock;
95 struct list_head next;
96 u32 valid_mask;
97 const char *master_names[sizeof(u32) * BITS_PER_BYTE];
Florian Fainelli203bb852014-09-18 12:37:14 -070098 u32 saved_timeout;
Florian Fainelli44127b72014-05-19 13:05:59 -070099};
100
101static LIST_HEAD(brcmstb_gisb_arb_device_list);
102
Kevin Cernekee2b53ead2014-11-25 16:49:50 -0800103static u32 gisb_read(struct brcmstb_gisb_arb_device *gdev, int reg)
104{
Kevin Cernekeef8083582014-11-25 16:49:51 -0800105 int offset = gdev->gisb_offsets[reg];
106
107 /* return 1 if the hardware doesn't have ARB_ERR_CAP_MASTER */
108 if (offset == -1)
109 return 1;
110
111 return ioread32(gdev->base + offset);
Kevin Cernekee2b53ead2014-11-25 16:49:50 -0800112}
113
114static void gisb_write(struct brcmstb_gisb_arb_device *gdev, u32 val, int reg)
115{
Kevin Cernekeef8083582014-11-25 16:49:51 -0800116 int offset = gdev->gisb_offsets[reg];
117
118 if (offset == -1)
119 return;
Kevin Cernekee2b53ead2014-11-25 16:49:50 -0800120 iowrite32(val, gdev->base + reg);
121}
122
Florian Fainelli44127b72014-05-19 13:05:59 -0700123static ssize_t gisb_arb_get_timeout(struct device *dev,
124 struct device_attribute *attr,
125 char *buf)
126{
127 struct platform_device *pdev = to_platform_device(dev);
128 struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
129 u32 timeout;
130
131 mutex_lock(&gdev->lock);
Kevin Cernekee2b53ead2014-11-25 16:49:50 -0800132 timeout = gisb_read(gdev, ARB_TIMER);
Florian Fainelli44127b72014-05-19 13:05:59 -0700133 mutex_unlock(&gdev->lock);
134
135 return sprintf(buf, "%d", timeout);
136}
137
138static ssize_t gisb_arb_set_timeout(struct device *dev,
139 struct device_attribute *attr,
140 const char *buf, size_t count)
141{
142 struct platform_device *pdev = to_platform_device(dev);
143 struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
144 int val, ret;
145
146 ret = kstrtoint(buf, 10, &val);
147 if (ret < 0)
148 return ret;
149
150 if (val == 0 || val >= 0xffffffff)
151 return -EINVAL;
152
153 mutex_lock(&gdev->lock);
Kevin Cernekee2b53ead2014-11-25 16:49:50 -0800154 gisb_write(gdev, val, ARB_TIMER);
Florian Fainelli44127b72014-05-19 13:05:59 -0700155 mutex_unlock(&gdev->lock);
156
157 return count;
158}
159
160static const char *
161brcmstb_gisb_master_to_str(struct brcmstb_gisb_arb_device *gdev,
162 u32 masters)
163{
164 u32 mask = gdev->valid_mask & masters;
165
166 if (hweight_long(mask) != 1)
167 return NULL;
168
169 return gdev->master_names[ffs(mask) - 1];
170}
171
172static int brcmstb_gisb_arb_decode_addr(struct brcmstb_gisb_arb_device *gdev,
173 const char *reason)
174{
175 u32 cap_status;
176 unsigned long arb_addr;
177 u32 master;
178 const char *m_name;
179 char m_fmt[11];
180
Kevin Cernekee2b53ead2014-11-25 16:49:50 -0800181 cap_status = gisb_read(gdev, ARB_ERR_CAP_STATUS);
Florian Fainelli44127b72014-05-19 13:05:59 -0700182
183 /* Invalid captured address, bail out */
184 if (!(cap_status & ARB_ERR_CAP_STATUS_VALID))
185 return 1;
186
187 /* Read the address and master */
Kevin Cernekee2b53ead2014-11-25 16:49:50 -0800188 arb_addr = gisb_read(gdev, ARB_ERR_CAP_ADDR) & 0xffffffff;
Florian Fainelli44127b72014-05-19 13:05:59 -0700189#if (IS_ENABLED(CONFIG_PHYS_ADDR_T_64BIT))
Kevin Cernekee2b53ead2014-11-25 16:49:50 -0800190 arb_addr |= (u64)gisb_read(gdev, ARB_ERR_CAP_HI_ADDR) << 32;
Florian Fainelli44127b72014-05-19 13:05:59 -0700191#endif
Kevin Cernekee2b53ead2014-11-25 16:49:50 -0800192 master = gisb_read(gdev, ARB_ERR_CAP_MASTER);
Florian Fainelli44127b72014-05-19 13:05:59 -0700193
194 m_name = brcmstb_gisb_master_to_str(gdev, master);
195 if (!m_name) {
196 snprintf(m_fmt, sizeof(m_fmt), "0x%08x", master);
197 m_name = m_fmt;
198 }
199
200 pr_crit("%s: %s at 0x%lx [%c %s], core: %s\n",
201 __func__, reason, arb_addr,
202 cap_status & ARB_ERR_CAP_STATUS_WRITE ? 'W' : 'R',
203 cap_status & ARB_ERR_CAP_STATUS_TIMEOUT ? "timeout" : "",
204 m_name);
205
206 /* clear the GISB error */
Kevin Cernekee2b53ead2014-11-25 16:49:50 -0800207 gisb_write(gdev, ARB_ERR_CAP_CLEAR, ARB_ERR_CAP_CLR);
Florian Fainelli44127b72014-05-19 13:05:59 -0700208
209 return 0;
210}
211
Kevin Cernekeedd1d78a2014-11-25 16:49:49 -0800212#ifdef CONFIG_ARM
Florian Fainelli44127b72014-05-19 13:05:59 -0700213static int brcmstb_bus_error_handler(unsigned long addr, unsigned int fsr,
214 struct pt_regs *regs)
215{
216 int ret = 0;
217 struct brcmstb_gisb_arb_device *gdev;
218
219 /* iterate over each GISB arb registered handlers */
220 list_for_each_entry(gdev, &brcmstb_gisb_arb_device_list, next)
221 ret |= brcmstb_gisb_arb_decode_addr(gdev, "bus error");
222 /*
223 * If it was an imprecise abort, then we need to correct the
224 * return address to be _after_ the instruction.
225 */
226 if (fsr & (1 << 10))
227 regs->ARM_pc += 4;
228
229 return ret;
230}
Kevin Cernekeedd1d78a2014-11-25 16:49:49 -0800231#endif
Florian Fainelli44127b72014-05-19 13:05:59 -0700232
233static irqreturn_t brcmstb_gisb_timeout_handler(int irq, void *dev_id)
234{
235 brcmstb_gisb_arb_decode_addr(dev_id, "timeout");
236
237 return IRQ_HANDLED;
238}
239
240static irqreturn_t brcmstb_gisb_tea_handler(int irq, void *dev_id)
241{
242 brcmstb_gisb_arb_decode_addr(dev_id, "target abort");
243
244 return IRQ_HANDLED;
245}
246
247static DEVICE_ATTR(gisb_arb_timeout, S_IWUSR | S_IRUGO,
248 gisb_arb_get_timeout, gisb_arb_set_timeout);
249
250static struct attribute *gisb_arb_sysfs_attrs[] = {
251 &dev_attr_gisb_arb_timeout.attr,
252 NULL,
253};
254
255static struct attribute_group gisb_arb_sysfs_attr_group = {
256 .attrs = gisb_arb_sysfs_attrs,
257};
258
Kevin Cernekeed1d67862014-11-25 16:49:52 -0800259static const struct of_device_id brcmstb_gisb_arb_of_match[] = {
260 { .compatible = "brcm,gisb-arb", .data = gisb_offsets_bcm7445 },
261 { .compatible = "brcm,bcm7445-gisb-arb", .data = gisb_offsets_bcm7445 },
262 { .compatible = "brcm,bcm7435-gisb-arb", .data = gisb_offsets_bcm7435 },
263 { .compatible = "brcm,bcm7400-gisb-arb", .data = gisb_offsets_bcm7400 },
264 { .compatible = "brcm,bcm7038-gisb-arb", .data = gisb_offsets_bcm7038 },
265 { },
266};
267
Florian Fainelli2e8a29a2014-11-20 10:14:46 -0800268static int __init brcmstb_gisb_arb_probe(struct platform_device *pdev)
Florian Fainelli44127b72014-05-19 13:05:59 -0700269{
270 struct device_node *dn = pdev->dev.of_node;
271 struct brcmstb_gisb_arb_device *gdev;
Kevin Cernekeed1d67862014-11-25 16:49:52 -0800272 const struct of_device_id *of_id;
Florian Fainelli44127b72014-05-19 13:05:59 -0700273 struct resource *r;
274 int err, timeout_irq, tea_irq;
275 unsigned int num_masters, j = 0;
276 int i, first, last;
277
278 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
279 timeout_irq = platform_get_irq(pdev, 0);
280 tea_irq = platform_get_irq(pdev, 1);
281
282 gdev = devm_kzalloc(&pdev->dev, sizeof(*gdev), GFP_KERNEL);
283 if (!gdev)
284 return -ENOMEM;
285
286 mutex_init(&gdev->lock);
287 INIT_LIST_HEAD(&gdev->next);
288
Jingoo Hanc9d53c02014-06-11 14:00:05 +0900289 gdev->base = devm_ioremap_resource(&pdev->dev, r);
290 if (IS_ERR(gdev->base))
291 return PTR_ERR(gdev->base);
Florian Fainelli44127b72014-05-19 13:05:59 -0700292
Kevin Cernekeed1d67862014-11-25 16:49:52 -0800293 of_id = of_match_node(brcmstb_gisb_arb_of_match, dn);
294 if (!of_id) {
295 pr_err("failed to look up compatible string\n");
296 return -EINVAL;
297 }
298 gdev->gisb_offsets = of_id->data;
Kevin Cernekeef8083582014-11-25 16:49:51 -0800299
Florian Fainelli44127b72014-05-19 13:05:59 -0700300 err = devm_request_irq(&pdev->dev, timeout_irq,
301 brcmstb_gisb_timeout_handler, 0, pdev->name,
302 gdev);
303 if (err < 0)
304 return err;
305
306 err = devm_request_irq(&pdev->dev, tea_irq,
307 brcmstb_gisb_tea_handler, 0, pdev->name,
308 gdev);
309 if (err < 0)
310 return err;
311
312 /* If we do not have a valid mask, assume all masters are enabled */
313 if (of_property_read_u32(dn, "brcm,gisb-arb-master-mask",
314 &gdev->valid_mask))
315 gdev->valid_mask = 0xffffffff;
316
317 /* Proceed with reading the litteral names if we agree on the
318 * number of masters
319 */
320 num_masters = of_property_count_strings(dn,
321 "brcm,gisb-arb-master-names");
322 if (hweight_long(gdev->valid_mask) == num_masters) {
323 first = ffs(gdev->valid_mask) - 1;
324 last = fls(gdev->valid_mask) - 1;
325
326 for (i = first; i < last; i++) {
327 if (!(gdev->valid_mask & BIT(i)))
328 continue;
329
330 of_property_read_string_index(dn,
331 "brcm,gisb-arb-master-names", j,
332 &gdev->master_names[i]);
333 j++;
334 }
335 }
336
337 err = sysfs_create_group(&pdev->dev.kobj, &gisb_arb_sysfs_attr_group);
338 if (err)
339 return err;
340
341 platform_set_drvdata(pdev, gdev);
342
343 list_add_tail(&gdev->next, &brcmstb_gisb_arb_device_list);
344
Arnd Bergmann71354662014-12-08 17:16:03 +0100345#ifdef CONFIG_ARM
Florian Fainellif1bee782014-09-18 12:32:10 -0700346 hook_fault_code(22, brcmstb_bus_error_handler, SIGBUS, 0,
347 "imprecise external abort");
Arnd Bergmann71354662014-12-08 17:16:03 +0100348#endif
Florian Fainellif1bee782014-09-18 12:32:10 -0700349
Florian Fainelli44127b72014-05-19 13:05:59 -0700350 dev_info(&pdev->dev, "registered mem: %p, irqs: %d, %d\n",
351 gdev->base, timeout_irq, tea_irq);
352
353 return 0;
354}
355
Florian Fainelli203bb852014-09-18 12:37:14 -0700356#ifdef CONFIG_PM_SLEEP
357static int brcmstb_gisb_arb_suspend(struct device *dev)
358{
359 struct platform_device *pdev = to_platform_device(dev);
360 struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
361
Arnd Bergmann71354662014-12-08 17:16:03 +0100362 gdev->saved_timeout = gisb_read(gdev, ARB_TIMER);
Florian Fainelli203bb852014-09-18 12:37:14 -0700363
364 return 0;
365}
366
367/* Make sure we provide the same timeout value that was configured before, and
368 * do this before the GISB timeout interrupt handler has any chance to run.
369 */
370static int brcmstb_gisb_arb_resume_noirq(struct device *dev)
371{
372 struct platform_device *pdev = to_platform_device(dev);
373 struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
374
Arnd Bergmann71354662014-12-08 17:16:03 +0100375 gisb_write(gdev, gdev->saved_timeout, ARB_TIMER);
Florian Fainelli203bb852014-09-18 12:37:14 -0700376
377 return 0;
378}
379#else
380#define brcmstb_gisb_arb_suspend NULL
381#define brcmstb_gisb_arb_resume_noirq NULL
382#endif
383
384static const struct dev_pm_ops brcmstb_gisb_arb_pm_ops = {
385 .suspend = brcmstb_gisb_arb_suspend,
386 .resume_noirq = brcmstb_gisb_arb_resume_noirq,
387};
388
Florian Fainelli44127b72014-05-19 13:05:59 -0700389static struct platform_driver brcmstb_gisb_arb_driver = {
Florian Fainelli44127b72014-05-19 13:05:59 -0700390 .driver = {
391 .name = "brcm-gisb-arb",
Florian Fainelli44127b72014-05-19 13:05:59 -0700392 .of_match_table = brcmstb_gisb_arb_of_match,
Florian Fainelli203bb852014-09-18 12:37:14 -0700393 .pm = &brcmstb_gisb_arb_pm_ops,
Florian Fainelli44127b72014-05-19 13:05:59 -0700394 },
395};
396
397static int __init brcm_gisb_driver_init(void)
398{
Florian Fainelli2e8a29a2014-11-20 10:14:46 -0800399 return platform_driver_probe(&brcmstb_gisb_arb_driver,
400 brcmstb_gisb_arb_probe);
Florian Fainelli44127b72014-05-19 13:05:59 -0700401}
402
403module_init(brcm_gisb_driver_init);