Merge commit 'v2.6.39' into 20110526
[linux-2.6.git] / arch / arm / mach-omap2 / omap_l3_noc.c
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         if (irq == l3->app_irq)
67                 inttype = L3_APPLICATION_ERROR;
68         else
69                 inttype = L3_DEBUG_ERROR;
70
71         for (i = 0; i < L3_MODULES; i++) {
72                 /*
73                  * Read the regerr register of the clock domain
74                  * to determine the source
75                  */
76                 base = (u32)l3->l3_base[i];
77                 err_reg =  readl(base + l3_flagmux[i] + (inttype << 3));
78
79                 /* Get the corresponding error and analyse */
80                 if (err_reg) {
81                         /* Identify the source from control status register */
82                         for (j = 0; !(err_reg & (1 << j)); j++)
83                                                                         ;
84
85                         err_src = j;
86                         /* Read the stderrlog_main_source from clk domain */
87                         std_err_main_addr = base + (*(l3_targ[i] + err_src));
88                         std_err_main =  readl(std_err_main_addr);
89
90                         switch ((std_err_main & CUSTOM_ERROR)) {
91                         case STANDARD_ERROR:
92                                 source_name =
93                                 l3_targ_stderrlog_main_name[i][err_src];
94
95                                 slave_addr = std_err_main_addr +
96                                                 L3_SLAVE_ADDRESS_OFFSET;
97                                 WARN(true, "L3 standard error: SOURCE:%s at address 0x%x\n",
98                                         source_name, readl(slave_addr));
99                                 /* clear the std error log*/
100                                 clear = std_err_main | CLEAR_STDERR_LOG;
101                                 writel(clear, std_err_main_addr);
102                                 break;
103
104                         case CUSTOM_ERROR:
105                                 source_name =
106                                 l3_targ_stderrlog_main_name[i][err_src];
107
108                                 WARN(true, "CUSTOM SRESP error with SOURCE:%s\n",
109                                                         source_name);
110                                 /* clear the std error log*/
111                                 clear = std_err_main | CLEAR_STDERR_LOG;
112                                 writel(clear, std_err_main_addr);
113                                 break;
114
115                         default:
116                                 /* Nothing to be handled here as of now */
117                                 break;
118                         }
119                 /* Error found so break the for loop */
120                 break;
121                 }
122         }
123         return IRQ_HANDLED;
124 }
125
126 static int __init omap4_l3_probe(struct platform_device *pdev)
127 {
128         static struct omap4_l3          *l3;
129         struct resource         *res;
130         int                     ret;
131         int                     irq;
132
133         l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
134         if (!l3)
135                 ret = -ENOMEM;
136
137         platform_set_drvdata(pdev, l3);
138         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
139         if (!res) {
140                 dev_err(&pdev->dev, "couldn't find resource 0\n");
141                 ret = -ENODEV;
142                 goto err1;
143         }
144
145         l3->l3_base[0] = ioremap(res->start, resource_size(res));
146         if (!(l3->l3_base[0])) {
147                 dev_err(&pdev->dev, "ioremap failed\n");
148                 ret = -ENOMEM;
149                 goto err2;
150         }
151
152         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
153         if (!res) {
154                 dev_err(&pdev->dev, "couldn't find resource 1\n");
155                 ret = -ENODEV;
156                 goto err3;
157         }
158
159         l3->l3_base[1] = ioremap(res->start, resource_size(res));
160         if (!(l3->l3_base[1])) {
161                 dev_err(&pdev->dev, "ioremap failed\n");
162                 ret = -ENOMEM;
163                 goto err4;
164         }
165
166         res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
167         if (!res) {
168                 dev_err(&pdev->dev, "couldn't find resource 2\n");
169                 ret = -ENODEV;
170                 goto err5;
171         }
172
173         l3->l3_base[2] = ioremap(res->start, resource_size(res));
174         if (!(l3->l3_base[2])) {
175                 dev_err(&pdev->dev, "ioremap failed\n");
176                 ret = -ENOMEM;
177                 goto err6;
178         }
179
180         /*
181          * Setup interrupt Handlers
182          */
183         irq = platform_get_irq(pdev, 0);
184         ret = request_irq(irq,
185                         l3_interrupt_handler,
186                         IRQF_DISABLED, "l3-dbg-irq", l3);
187         if (ret) {
188                 pr_crit("L3: request_irq failed to register for 0x%x\n",
189                                          OMAP44XX_IRQ_L3_DBG);
190                 goto err7;
191         }
192         l3->debug_irq = irq;
193
194         irq = platform_get_irq(pdev, 1);
195         ret = request_irq(irq,
196                         l3_interrupt_handler,
197                         IRQF_DISABLED, "l3-app-irq", l3);
198         if (ret) {
199                 pr_crit("L3: request_irq failed to register for 0x%x\n",
200                                          OMAP44XX_IRQ_L3_APP);
201                 goto err8;
202         }
203         l3->app_irq = irq;
204
205         goto err0;
206 err8:
207 err7:
208         iounmap(l3->l3_base[2]);
209 err6:
210 err5:
211         iounmap(l3->l3_base[1]);
212 err4:
213 err3:
214         iounmap(l3->l3_base[0]);
215 err2:
216 err1:
217         kfree(l3);
218 err0:
219         return ret;
220 }
221
222 static int __exit omap4_l3_remove(struct platform_device *pdev)
223 {
224         struct omap4_l3         *l3 = platform_get_drvdata(pdev);
225
226         free_irq(l3->app_irq, l3);
227         free_irq(l3->debug_irq, l3);
228         iounmap(l3->l3_base[0]);
229         iounmap(l3->l3_base[1]);
230         iounmap(l3->l3_base[2]);
231         kfree(l3);
232
233         return 0;
234 }
235
236 static struct platform_driver omap4_l3_driver = {
237         .remove         = __exit_p(omap4_l3_remove),
238         .driver         = {
239         .name           = "omap_l3_noc",
240         },
241 };
242
243 static int __init omap4_l3_init(void)
244 {
245         return platform_driver_probe(&omap4_l3_driver, omap4_l3_probe);
246 }
247 postcore_initcall_sync(omap4_l3_init);
248
249 static void __exit omap4_l3_exit(void)
250 {
251         platform_driver_unregister(&omap4_l3_driver);
252 }
253 module_exit(omap4_l3_exit);