Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[pandora-kernel.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         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);