diff options
author | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
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committer | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
commit | fcc9d2e5a6c89d22b8b773a64fb4ad21ac318446 (patch) | |
tree | a57612d1888735a2ec7972891b68c1ac5ec8faea /arch/arm/mach-omap2/omap_l3_noc.c | |
parent | 8dea78da5cee153b8af9c07a2745f6c55057fe12 (diff) |
Diffstat (limited to 'arch/arm/mach-omap2/omap_l3_noc.c')
-rw-r--r-- | arch/arm/mach-omap2/omap_l3_noc.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/omap_l3_noc.c b/arch/arm/mach-omap2/omap_l3_noc.c new file mode 100644 index 00000000000..7b9f1909ddb --- /dev/null +++ b/arch/arm/mach-omap2/omap_l3_noc.c | |||
@@ -0,0 +1,248 @@ | |||
1 | /* | ||
2 | * OMAP4XXX L3 Interconnect error handling driver | ||
3 | * | ||
4 | * Copyright (C) 2011 Texas Corporation | ||
5 | * Santosh Shilimkar <santosh.shilimkar@ti.com> | ||
6 | * Sricharan <r.sricharan@ti.com> | ||
7 | * | ||
8 | * This program is free software; you can redistribute it and/or modify | ||
9 | * it under the terms of the GNU General Public License as published by | ||
10 | * the Free Software Foundation; either version 2 of the License, or | ||
11 | * (at your option) any later version. | ||
12 | * | ||
13 | * This program is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
16 | * GNU General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU General Public License | ||
19 | * along with this program; if not, write to the Free Software | ||
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | ||
21 | * USA | ||
22 | */ | ||
23 | #include <linux/init.h> | ||
24 | #include <linux/io.h> | ||
25 | #include <linux/platform_device.h> | ||
26 | #include <linux/interrupt.h> | ||
27 | #include <linux/kernel.h> | ||
28 | #include <linux/slab.h> | ||
29 | |||
30 | #include "omap_l3_noc.h" | ||
31 | |||
32 | /* | ||
33 | * Interrupt Handler for L3 error detection. | ||
34 | * 1) Identify the L3 clockdomain partition to which the error belongs to. | ||
35 | * 2) Identify the slave where the error information is logged | ||
36 | * 3) Print the logged information. | ||
37 | * 4) Add dump stack to provide kernel trace. | ||
38 | * | ||
39 | * Two Types of errors : | ||
40 | * 1) Custom errors in L3 : | ||
41 | * Target like DMM/FW/EMIF generates SRESP=ERR error | ||
42 | * 2) Standard L3 error: | ||
43 | * - Unsupported CMD. | ||
44 | * L3 tries to access target while it is idle | ||
45 | * - OCP disconnect. | ||
46 | * - Address hole error: | ||
47 | * If DSS/ISS/FDIF/USBHOSTFS access a target where they | ||
48 | * do not have connectivity, the error is logged in | ||
49 | * their default target which is DMM2. | ||
50 | * | ||
51 | * On High Secure devices, firewall errors are possible and those | ||
52 | * can be trapped as well. But the trapping is implemented as part | ||
53 | * secure software and hence need not be implemented here. | ||
54 | */ | ||
55 | static irqreturn_t l3_interrupt_handler(int irq, void *_l3) | ||
56 | { | ||
57 | |||
58 | struct omap4_l3 *l3 = _l3; | ||
59 | int inttype, i, j; | ||
60 | int err_src = 0; | ||
61 | u32 std_err_main_addr, std_err_main, err_reg; | ||
62 | u32 base, slave_addr, clear; | ||
63 | char *source_name; | ||
64 | |||
65 | /* Get the Type of interrupt */ | ||
66 | inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR; | ||
67 | |||
68 | for (i = 0; i < L3_MODULES; i++) { | ||
69 | /* | ||
70 | * Read the regerr register of the clock domain | ||
71 | * to determine the source | ||
72 | */ | ||
73 | base = (u32)l3->l3_base[i]; | ||
74 | err_reg = readl(base + l3_flagmux[i] + (inttype << 3)); | ||
75 | |||
76 | /* Get the corresponding error and analyse */ | ||
77 | if (err_reg) { | ||
78 | /* Identify the source from control status register */ | ||
79 | for (j = 0; !(err_reg & (1 << j)); j++) | ||
80 | ; | ||
81 | |||
82 | err_src = j; | ||
83 | /* Read the stderrlog_main_source from clk domain */ | ||
84 | std_err_main_addr = base + *(l3_targ[i] + err_src); | ||
85 | std_err_main = readl(std_err_main_addr); | ||
86 | |||
87 | switch (std_err_main & CUSTOM_ERROR) { | ||
88 | case STANDARD_ERROR: | ||
89 | source_name = | ||
90 | l3_targ_stderrlog_main_name[i][err_src]; | ||
91 | |||
92 | slave_addr = std_err_main_addr + | ||
93 | L3_SLAVE_ADDRESS_OFFSET; | ||
94 | WARN(true, "L3 standard error: SOURCE:%s at address 0x%x\n", | ||
95 | source_name, readl(slave_addr)); | ||
96 | /* clear the std error log*/ | ||
97 | clear = std_err_main | CLEAR_STDERR_LOG; | ||
98 | writel(clear, std_err_main_addr); | ||
99 | break; | ||
100 | |||
101 | case CUSTOM_ERROR: | ||
102 | source_name = | ||
103 | l3_targ_stderrlog_main_name[i][err_src]; | ||
104 | |||
105 | WARN(true, "CUSTOM SRESP error with SOURCE:%s\n", | ||
106 | source_name); | ||
107 | /* clear the std error log*/ | ||
108 | clear = std_err_main | CLEAR_STDERR_LOG; | ||
109 | writel(clear, std_err_main_addr); | ||
110 | break; | ||
111 | |||
112 | default: | ||
113 | /* Nothing to be handled here as of now */ | ||
114 | break; | ||
115 | } | ||
116 | /* Error found so break the for loop */ | ||
117 | break; | ||
118 | } | ||
119 | } | ||
120 | return IRQ_HANDLED; | ||
121 | } | ||
122 | |||
123 | static int __init omap4_l3_probe(struct platform_device *pdev) | ||
124 | { | ||
125 | static struct omap4_l3 *l3; | ||
126 | struct resource *res; | ||
127 | int ret; | ||
128 | int irq; | ||
129 | |||
130 | l3 = kzalloc(sizeof(*l3), GFP_KERNEL); | ||
131 | if (!l3) | ||
132 | return -ENOMEM; | ||
133 | |||
134 | platform_set_drvdata(pdev, l3); | ||
135 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
136 | if (!res) { | ||
137 | dev_err(&pdev->dev, "couldn't find resource 0\n"); | ||
138 | ret = -ENODEV; | ||
139 | goto err0; | ||
140 | } | ||
141 | |||
142 | l3->l3_base[0] = ioremap(res->start, resource_size(res)); | ||
143 | if (!l3->l3_base[0]) { | ||
144 | dev_err(&pdev->dev, "ioremap failed\n"); | ||
145 | ret = -ENOMEM; | ||
146 | goto err0; | ||
147 | } | ||
148 | |||
149 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | ||
150 | if (!res) { | ||
151 | dev_err(&pdev->dev, "couldn't find resource 1\n"); | ||
152 | ret = -ENODEV; | ||
153 | goto err1; | ||
154 | } | ||
155 | |||
156 | l3->l3_base[1] = ioremap(res->start, resource_size(res)); | ||
157 | if (!l3->l3_base[1]) { | ||
158 | dev_err(&pdev->dev, "ioremap failed\n"); | ||
159 | ret = -ENOMEM; | ||
160 | goto err1; | ||
161 | } | ||
162 | |||
163 | res = platform_get_resource(pdev, IORESOURCE_MEM, 2); | ||
164 | if (!res) { | ||
165 | dev_err(&pdev->dev, "couldn't find resource 2\n"); | ||
166 | ret = -ENODEV; | ||
167 | goto err2; | ||
168 | } | ||
169 | |||
170 | l3->l3_base[2] = ioremap(res->start, resource_size(res)); | ||
171 | if (!l3->l3_base[2]) { | ||
172 | dev_err(&pdev->dev, "ioremap failed\n"); | ||
173 | ret = -ENOMEM; | ||
174 | goto err2; | ||
175 | } | ||
176 | |||
177 | /* | ||
178 | * Setup interrupt Handlers | ||
179 | */ | ||
180 | irq = platform_get_irq(pdev, 0); | ||
181 | ret = request_irq(irq, | ||
182 | l3_interrupt_handler, | ||
183 | IRQF_DISABLED, "l3-dbg-irq", l3); | ||
184 | if (ret) { | ||
185 | pr_crit("L3: request_irq failed to register for 0x%x\n", | ||
186 | OMAP44XX_IRQ_L3_DBG); | ||
187 | goto err3; | ||
188 | } | ||
189 | l3->debug_irq = irq; | ||
190 | |||
191 | irq = platform_get_irq(pdev, 1); | ||
192 | ret = request_irq(irq, | ||
193 | l3_interrupt_handler, | ||
194 | IRQF_DISABLED, "l3-app-irq", l3); | ||
195 | if (ret) { | ||
196 | pr_crit("L3: request_irq failed to register for 0x%x\n", | ||
197 | OMAP44XX_IRQ_L3_APP); | ||
198 | goto err4; | ||
199 | } | ||
200 | l3->app_irq = irq; | ||
201 | |||
202 | return 0; | ||
203 | |||
204 | err4: | ||
205 | free_irq(l3->debug_irq, l3); | ||
206 | err3: | ||
207 | iounmap(l3->l3_base[2]); | ||
208 | err2: | ||
209 | iounmap(l3->l3_base[1]); | ||
210 | err1: | ||
211 | iounmap(l3->l3_base[0]); | ||
212 | err0: | ||
213 | kfree(l3); | ||
214 | return ret; | ||
215 | } | ||
216 | |||
217 | static int __exit omap4_l3_remove(struct platform_device *pdev) | ||
218 | { | ||
219 | struct omap4_l3 *l3 = platform_get_drvdata(pdev); | ||
220 | |||
221 | free_irq(l3->app_irq, l3); | ||
222 | free_irq(l3->debug_irq, l3); | ||
223 | iounmap(l3->l3_base[0]); | ||
224 | iounmap(l3->l3_base[1]); | ||
225 | iounmap(l3->l3_base[2]); | ||
226 | kfree(l3); | ||
227 | |||
228 | return 0; | ||
229 | } | ||
230 | |||
231 | static struct platform_driver omap4_l3_driver = { | ||
232 | .remove = __exit_p(omap4_l3_remove), | ||
233 | .driver = { | ||
234 | .name = "omap_l3_noc", | ||
235 | }, | ||
236 | }; | ||
237 | |||
238 | static int __init omap4_l3_init(void) | ||
239 | { | ||
240 | return platform_driver_probe(&omap4_l3_driver, omap4_l3_probe); | ||
241 | } | ||
242 | postcore_initcall_sync(omap4_l3_init); | ||
243 | |||
244 | static void __exit omap4_l3_exit(void) | ||
245 | { | ||
246 | platform_driver_unregister(&omap4_l3_driver); | ||
247 | } | ||
248 | module_exit(omap4_l3_exit); | ||