1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
|
/*
* OMAP4XXX L3 Interconnect error handling driver
*
* Copyright (C) 2011 Texas Corporation
* Santosh Shilimkar <santosh.shilimkar@ti.com>
* Sricharan <r.sricharan@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include "omap_l3_noc.h"
/*
* Interrupt Handler for L3 error detection.
* 1) Identify the L3 clockdomain partition to which the error belongs to.
* 2) Identify the slave where the error information is logged
* 3) Print the logged information.
* 4) Add dump stack to provide kernel trace.
*
* Two Types of errors :
* 1) Custom errors in L3 :
* Target like DMM/FW/EMIF generates SRESP=ERR error
* 2) Standard L3 error:
* - Unsupported CMD.
* L3 tries to access target while it is idle
* - OCP disconnect.
* - Address hole error:
* If DSS/ISS/FDIF/USBHOSTFS access a target where they
* do not have connectivity, the error is logged in
* their default target which is DMM2.
*
* On High Secure devices, firewall errors are possible and those
* can be trapped as well. But the trapping is implemented as part
* secure software and hence need not be implemented here.
*/
static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
{
struct omap4_l3 *l3 = _l3;
int inttype, i, k;
int err_src = 0;
u32 std_err_main, err_reg, clear, masterid;
void __iomem *base, *l3_targ_base;
char *target_name, *master_name = "UN IDENTIFIED";
/* Get the Type of interrupt */
inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
for (i = 0; i < L3_MODULES; i++) {
/*
* Read the regerr register of the clock domain
* to determine the source
*/
base = l3->l3_base[i];
err_reg = __raw_readl(base + l3_flagmux[i] +
+ L3_FLAGMUX_REGERR0 + (inttype << 3));
/* Get the corresponding error and analyse */
if (err_reg) {
/* Identify the source from control status register */
err_src = __ffs(err_reg);
/* Read the stderrlog_main_source from clk domain */
l3_targ_base = base + *(l3_targ[i] + err_src);
std_err_main = __raw_readl(l3_targ_base +
L3_TARG_STDERRLOG_MAIN);
masterid = __raw_readl(l3_targ_base +
L3_TARG_STDERRLOG_MSTADDR);
switch (std_err_main & CUSTOM_ERROR) {
case STANDARD_ERROR:
target_name =
l3_targ_inst_name[i][err_src];
WARN(true, "L3 standard error: TARGET:%s at address 0x%x\n",
target_name,
__raw_readl(l3_targ_base +
L3_TARG_STDERRLOG_SLVOFSLSB));
/* clear the std error log*/
clear = std_err_main | CLEAR_STDERR_LOG;
writel(clear, l3_targ_base +
L3_TARG_STDERRLOG_MAIN);
break;
case CUSTOM_ERROR:
target_name =
l3_targ_inst_name[i][err_src];
for (k = 0; k < NUM_OF_L3_MASTERS; k++) {
if (masterid == l3_masters[k].id)
master_name =
l3_masters[k].name;
}
WARN(true, "L3 custom error: MASTER:%s TARGET:%s\n",
master_name, target_name);
/* clear the std error log*/
clear = std_err_main | CLEAR_STDERR_LOG;
writel(clear, l3_targ_base +
L3_TARG_STDERRLOG_MAIN);
break;
default:
/* Nothing to be handled here as of now */
break;
}
/* Error found so break the for loop */
break;
}
}
return IRQ_HANDLED;
}
static int __devinit omap4_l3_probe(struct platform_device *pdev)
{
static struct omap4_l3 *l3;
struct resource *res;
int ret;
l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
if (!l3)
return -ENOMEM;
platform_set_drvdata(pdev, l3);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "couldn't find resource 0\n");
ret = -ENODEV;
goto err0;
}
l3->l3_base[0] = ioremap(res->start, resource_size(res));
if (!l3->l3_base[0]) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto err0;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res) {
dev_err(&pdev->dev, "couldn't find resource 1\n");
ret = -ENODEV;
goto err1;
}
l3->l3_base[1] = ioremap(res->start, resource_size(res));
if (!l3->l3_base[1]) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto err1;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
if (!res) {
dev_err(&pdev->dev, "couldn't find resource 2\n");
ret = -ENODEV;
goto err2;
}
l3->l3_base[2] = ioremap(res->start, resource_size(res));
if (!l3->l3_base[2]) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto err2;
}
/*
* Setup interrupt Handlers
*/
l3->debug_irq = platform_get_irq(pdev, 0);
ret = request_irq(l3->debug_irq,
l3_interrupt_handler,
IRQF_DISABLED, "l3-dbg-irq", l3);
if (ret) {
pr_crit("L3: request_irq failed to register for 0x%x\n",
OMAP44XX_IRQ_L3_DBG);
goto err3;
}
l3->app_irq = platform_get_irq(pdev, 1);
ret = request_irq(l3->app_irq,
l3_interrupt_handler,
IRQF_DISABLED, "l3-app-irq", l3);
if (ret) {
pr_crit("L3: request_irq failed to register for 0x%x\n",
OMAP44XX_IRQ_L3_APP);
goto err4;
}
return 0;
err4:
free_irq(l3->debug_irq, l3);
err3:
iounmap(l3->l3_base[2]);
err2:
iounmap(l3->l3_base[1]);
err1:
iounmap(l3->l3_base[0]);
err0:
kfree(l3);
return ret;
}
static int __devexit omap4_l3_remove(struct platform_device *pdev)
{
struct omap4_l3 *l3 = platform_get_drvdata(pdev);
free_irq(l3->app_irq, l3);
free_irq(l3->debug_irq, l3);
iounmap(l3->l3_base[0]);
iounmap(l3->l3_base[1]);
iounmap(l3->l3_base[2]);
kfree(l3);
return 0;
}
#if defined(CONFIG_OF)
static const struct of_device_id l3_noc_match[] = {
{.compatible = "ti,omap4-l3-noc", },
{},
}
MODULE_DEVICE_TABLE(of, l3_noc_match);
#else
#define l3_noc_match NULL
#endif
static struct platform_driver omap4_l3_driver = {
.probe = omap4_l3_probe,
.remove = __devexit_p(omap4_l3_remove),
.driver = {
.name = "omap_l3_noc",
.owner = THIS_MODULE,
.of_match_table = l3_noc_match,
},
};
static int __init omap4_l3_init(void)
{
return platform_driver_register(&omap4_l3_driver);
}
postcore_initcall_sync(omap4_l3_init);
static void __exit omap4_l3_exit(void)
{
platform_driver_unregister(&omap4_l3_driver);
}
module_exit(omap4_l3_exit);
|
