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2722e56d SS |
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; | |
342fd144 | 59 | int inttype, i; |
2722e56d | 60 | int err_src = 0; |
342fd144 | 61 | u32 std_err_main, err_reg, clear, base, l3_targ_base; |
2722e56d SS |
62 | char *source_name; |
63 | ||
64 | /* Get the Type of interrupt */ | |
35f7b961 | 65 | inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR; |
2722e56d SS |
66 | |
67 | for (i = 0; i < L3_MODULES; i++) { | |
68 | /* | |
69 | * Read the regerr register of the clock domain | |
70 | * to determine the source | |
71 | */ | |
72 | base = (u32)l3->l3_base[i]; | |
342fd144 TP |
73 | err_reg = readl(base + l3_flagmux[i] + |
74 | + L3_FLAGMUX_REGERR0 + (inttype << 3)); | |
2722e56d SS |
75 | |
76 | /* Get the corresponding error and analyse */ | |
77 | if (err_reg) { | |
78 | /* Identify the source from control status register */ | |
342fd144 | 79 | err_src = __ffs(err_reg); |
2722e56d | 80 | |
2722e56d | 81 | /* Read the stderrlog_main_source from clk domain */ |
342fd144 TP |
82 | l3_targ_base = base + *(l3_targ[i] + err_src); |
83 | std_err_main = readl(l3_targ_base + | |
84 | L3_TARG_STDERRLOG_MAIN); | |
2722e56d | 85 | |
35f7b961 | 86 | switch (std_err_main & CUSTOM_ERROR) { |
2722e56d SS |
87 | case STANDARD_ERROR: |
88 | source_name = | |
342fd144 | 89 | l3_targ_inst_name[i][err_src]; |
2722e56d | 90 | WARN(true, "L3 standard error: SOURCE:%s at address 0x%x\n", |
342fd144 TP |
91 | source_name, |
92 | readl(l3_targ_base + | |
93 | L3_TARG_STDERRLOG_SLVOFSLSB)); | |
2722e56d SS |
94 | /* clear the std error log*/ |
95 | clear = std_err_main | CLEAR_STDERR_LOG; | |
342fd144 TP |
96 | writel(clear, l3_targ_base + |
97 | L3_TARG_STDERRLOG_MAIN); | |
2722e56d SS |
98 | break; |
99 | ||
100 | case CUSTOM_ERROR: | |
101 | source_name = | |
342fd144 | 102 | l3_targ_inst_name[i][err_src]; |
2722e56d | 103 | |
342fd144 TP |
104 | WARN(true, "L3 custom error: SOURCE:%s\n", |
105 | source_name); | |
2722e56d SS |
106 | /* clear the std error log*/ |
107 | clear = std_err_main | CLEAR_STDERR_LOG; | |
342fd144 TP |
108 | writel(clear, l3_targ_base + |
109 | L3_TARG_STDERRLOG_MAIN); | |
2722e56d SS |
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; | |
342fd144 TP |
126 | struct resource *res; |
127 | int ret, irq; | |
2722e56d SS |
128 | |
129 | l3 = kzalloc(sizeof(*l3), GFP_KERNEL); | |
130 | if (!l3) | |
7529b703 | 131 | return -ENOMEM; |
2722e56d SS |
132 | |
133 | platform_set_drvdata(pdev, l3); | |
134 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
135 | if (!res) { | |
136 | dev_err(&pdev->dev, "couldn't find resource 0\n"); | |
137 | ret = -ENODEV; | |
7529b703 | 138 | goto err0; |
2722e56d SS |
139 | } |
140 | ||
141 | l3->l3_base[0] = ioremap(res->start, resource_size(res)); | |
35f7b961 | 142 | if (!l3->l3_base[0]) { |
2722e56d SS |
143 | dev_err(&pdev->dev, "ioremap failed\n"); |
144 | ret = -ENOMEM; | |
7529b703 | 145 | goto err0; |
2722e56d SS |
146 | } |
147 | ||
148 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
149 | if (!res) { | |
150 | dev_err(&pdev->dev, "couldn't find resource 1\n"); | |
151 | ret = -ENODEV; | |
7529b703 | 152 | goto err1; |
2722e56d SS |
153 | } |
154 | ||
155 | l3->l3_base[1] = ioremap(res->start, resource_size(res)); | |
35f7b961 | 156 | if (!l3->l3_base[1]) { |
2722e56d SS |
157 | dev_err(&pdev->dev, "ioremap failed\n"); |
158 | ret = -ENOMEM; | |
7529b703 | 159 | goto err1; |
2722e56d SS |
160 | } |
161 | ||
162 | res = platform_get_resource(pdev, IORESOURCE_MEM, 2); | |
163 | if (!res) { | |
164 | dev_err(&pdev->dev, "couldn't find resource 2\n"); | |
165 | ret = -ENODEV; | |
7529b703 | 166 | goto err2; |
2722e56d SS |
167 | } |
168 | ||
169 | l3->l3_base[2] = ioremap(res->start, resource_size(res)); | |
35f7b961 | 170 | if (!l3->l3_base[2]) { |
2722e56d SS |
171 | dev_err(&pdev->dev, "ioremap failed\n"); |
172 | ret = -ENOMEM; | |
7529b703 | 173 | goto err2; |
2722e56d SS |
174 | } |
175 | ||
176 | /* | |
177 | * Setup interrupt Handlers | |
178 | */ | |
179 | irq = platform_get_irq(pdev, 0); | |
180 | ret = request_irq(irq, | |
181 | l3_interrupt_handler, | |
182 | IRQF_DISABLED, "l3-dbg-irq", l3); | |
183 | if (ret) { | |
184 | pr_crit("L3: request_irq failed to register for 0x%x\n", | |
185 | OMAP44XX_IRQ_L3_DBG); | |
7529b703 | 186 | goto err3; |
2722e56d SS |
187 | } |
188 | l3->debug_irq = irq; | |
189 | ||
190 | irq = platform_get_irq(pdev, 1); | |
191 | ret = request_irq(irq, | |
192 | l3_interrupt_handler, | |
193 | IRQF_DISABLED, "l3-app-irq", l3); | |
194 | if (ret) { | |
195 | pr_crit("L3: request_irq failed to register for 0x%x\n", | |
196 | OMAP44XX_IRQ_L3_APP); | |
7529b703 | 197 | goto err4; |
2722e56d SS |
198 | } |
199 | l3->app_irq = irq; | |
200 | ||
7529b703 | 201 | return 0; |
202 | ||
2722e56d | 203 | err4: |
7529b703 | 204 | free_irq(l3->debug_irq, l3); |
2722e56d | 205 | err3: |
7529b703 | 206 | iounmap(l3->l3_base[2]); |
2722e56d | 207 | err2: |
7529b703 | 208 | iounmap(l3->l3_base[1]); |
2722e56d | 209 | err1: |
7529b703 | 210 | iounmap(l3->l3_base[0]); |
2722e56d | 211 | err0: |
7529b703 | 212 | kfree(l3); |
2722e56d SS |
213 | return ret; |
214 | } | |
215 | ||
216 | static int __exit omap4_l3_remove(struct platform_device *pdev) | |
217 | { | |
218 | struct omap4_l3 *l3 = platform_get_drvdata(pdev); | |
219 | ||
220 | free_irq(l3->app_irq, l3); | |
221 | free_irq(l3->debug_irq, l3); | |
222 | iounmap(l3->l3_base[0]); | |
223 | iounmap(l3->l3_base[1]); | |
224 | iounmap(l3->l3_base[2]); | |
225 | kfree(l3); | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static struct platform_driver omap4_l3_driver = { | |
231 | .remove = __exit_p(omap4_l3_remove), | |
232 | .driver = { | |
233 | .name = "omap_l3_noc", | |
234 | }, | |
235 | }; | |
236 | ||
237 | static int __init omap4_l3_init(void) | |
238 | { | |
239 | return platform_driver_probe(&omap4_l3_driver, omap4_l3_probe); | |
240 | } | |
241 | postcore_initcall_sync(omap4_l3_init); | |
242 | ||
243 | static void __exit omap4_l3_exit(void) | |
244 | { | |
245 | platform_driver_unregister(&omap4_l3_driver); | |
246 | } | |
247 | module_exit(omap4_l3_exit); |