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Linux/drivers/bus/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/module.h>
 24 #include <linux/init.h>
 25 #include <linux/io.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/interrupt.h>
 28 #include <linux/kernel.h>
 29 #include <linux/slab.h>
 30 
 31 #include "omap_l3_noc.h"
 32 
 33 /*
 34  * Interrupt Handler for L3 error detection.
 35  *      1) Identify the L3 clockdomain partition to which the error belongs to.
 36  *      2) Identify the slave where the error information is logged
 37  *      3) Print the logged information.
 38  *      4) Add dump stack to provide kernel trace.
 39  *
 40  * Two Types of errors :
 41  *      1) Custom errors in L3 :
 42  *              Target like DMM/FW/EMIF generates SRESP=ERR error
 43  *      2) Standard L3 error:
 44  *              - Unsupported CMD.
 45  *                      L3 tries to access target while it is idle
 46  *              - OCP disconnect.
 47  *              - Address hole error:
 48  *                      If DSS/ISS/FDIF/USBHOSTFS access a target where they
 49  *                      do not have connectivity, the error is logged in
 50  *                      their default target which is DMM2.
 51  *
 52  *      On High Secure devices, firewall errors are possible and those
 53  *      can be trapped as well. But the trapping is implemented as part
 54  *      secure software and hence need not be implemented here.
 55  */
 56 static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
 57 {
 58 
 59         struct omap4_l3 *l3 = _l3;
 60         int inttype, i, k;
 61         int err_src = 0;
 62         u32 std_err_main, err_reg, clear, masterid;
 63         void __iomem *base, *l3_targ_base;
 64         char *target_name, *master_name = "UN IDENTIFIED";
 65 
 66         /* Get the Type of interrupt */
 67         inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
 68 
 69         for (i = 0; i < L3_MODULES; i++) {
 70                 /*
 71                  * Read the regerr register of the clock domain
 72                  * to determine the source
 73                  */
 74                 base = l3->l3_base[i];
 75                 err_reg = __raw_readl(base + l3_flagmux[i] +
 76                                         + L3_FLAGMUX_REGERR0 + (inttype << 3));
 77 
 78                 /* Get the corresponding error and analyse */
 79                 if (err_reg) {
 80                         /* Identify the source from control status register */
 81                         err_src = __ffs(err_reg);
 82 
 83                         /* Read the stderrlog_main_source from clk domain */
 84                         l3_targ_base = base + *(l3_targ[i] + err_src);
 85                         std_err_main =  __raw_readl(l3_targ_base +
 86                                         L3_TARG_STDERRLOG_MAIN);
 87                         masterid = __raw_readl(l3_targ_base +
 88                                         L3_TARG_STDERRLOG_MSTADDR);
 89 
 90                         switch (std_err_main & CUSTOM_ERROR) {
 91                         case STANDARD_ERROR:
 92                                 target_name =
 93                                         l3_targ_inst_name[i][err_src];
 94                                 WARN(true, "L3 standard error: TARGET:%s at address 0x%x\n",
 95                                         target_name,
 96                                         __raw_readl(l3_targ_base +
 97                                                 L3_TARG_STDERRLOG_SLVOFSLSB));
 98                                 /* clear the std error log*/
 99                                 clear = std_err_main | CLEAR_STDERR_LOG;
100                                 writel(clear, l3_targ_base +
101                                         L3_TARG_STDERRLOG_MAIN);
102                                 break;
103 
104                         case CUSTOM_ERROR:
105                                 target_name =
106                                         l3_targ_inst_name[i][err_src];
107                                 for (k = 0; k < NUM_OF_L3_MASTERS; k++) {
108                                         if (masterid == l3_masters[k].id)
109                                                 master_name =
110                                                         l3_masters[k].name;
111                                 }
112                                 WARN(true, "L3 custom error: MASTER:%s TARGET:%s\n",
113                                         master_name, target_name);
114                                 /* clear the std error log*/
115                                 clear = std_err_main | CLEAR_STDERR_LOG;
116                                 writel(clear, l3_targ_base +
117                                         L3_TARG_STDERRLOG_MAIN);
118                                 break;
119 
120                         default:
121                                 /* Nothing to be handled here as of now */
122                                 break;
123                         }
124                 /* Error found so break the for loop */
125                 break;
126                 }
127         }
128         return IRQ_HANDLED;
129 }
130 
131 static int omap4_l3_probe(struct platform_device *pdev)
132 {
133         static struct omap4_l3 *l3;
134         struct resource *res;
135         int ret;
136 
137         l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
138         if (!l3)
139                 return -ENOMEM;
140 
141         platform_set_drvdata(pdev, l3);
142         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
143         if (!res) {
144                 dev_err(&pdev->dev, "couldn't find resource 0\n");
145                 ret = -ENODEV;
146                 goto err0;
147         }
148 
149         l3->l3_base[0] = ioremap(res->start, resource_size(res));
150         if (!l3->l3_base[0]) {
151                 dev_err(&pdev->dev, "ioremap failed\n");
152                 ret = -ENOMEM;
153                 goto err0;
154         }
155 
156         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
157         if (!res) {
158                 dev_err(&pdev->dev, "couldn't find resource 1\n");
159                 ret = -ENODEV;
160                 goto err1;
161         }
162 
163         l3->l3_base[1] = ioremap(res->start, resource_size(res));
164         if (!l3->l3_base[1]) {
165                 dev_err(&pdev->dev, "ioremap failed\n");
166                 ret = -ENOMEM;
167                 goto err1;
168         }
169 
170         res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
171         if (!res) {
172                 dev_err(&pdev->dev, "couldn't find resource 2\n");
173                 ret = -ENODEV;
174                 goto err2;
175         }
176 
177         l3->l3_base[2] = ioremap(res->start, resource_size(res));
178         if (!l3->l3_base[2]) {
179                 dev_err(&pdev->dev, "ioremap failed\n");
180                 ret = -ENOMEM;
181                 goto err2;
182         }
183 
184         /*
185          * Setup interrupt Handlers
186          */
187         l3->debug_irq = platform_get_irq(pdev, 0);
188         ret = request_irq(l3->debug_irq,
189                         l3_interrupt_handler,
190                         IRQF_DISABLED, "l3-dbg-irq", l3);
191         if (ret) {
192                 pr_crit("L3: request_irq failed to register for 0x%x\n",
193                                                 l3->debug_irq);
194                 goto err3;
195         }
196 
197         l3->app_irq = platform_get_irq(pdev, 1);
198         ret = request_irq(l3->app_irq,
199                         l3_interrupt_handler,
200                         IRQF_DISABLED, "l3-app-irq", l3);
201         if (ret) {
202                 pr_crit("L3: request_irq failed to register for 0x%x\n",
203                                                 l3->app_irq);
204                 goto err4;
205         }
206 
207         return 0;
208 
209 err4:
210         free_irq(l3->debug_irq, l3);
211 err3:
212         iounmap(l3->l3_base[2]);
213 err2:
214         iounmap(l3->l3_base[1]);
215 err1:
216         iounmap(l3->l3_base[0]);
217 err0:
218         kfree(l3);
219         return ret;
220 }
221 
222 static int 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 #if defined(CONFIG_OF)
237 static const struct of_device_id l3_noc_match[] = {
238         {.compatible = "ti,omap4-l3-noc", },
239         {},
240 };
241 MODULE_DEVICE_TABLE(of, l3_noc_match);
242 #else
243 #define l3_noc_match NULL
244 #endif
245 
246 static struct platform_driver omap4_l3_driver = {
247         .probe          = omap4_l3_probe,
248         .remove         = omap4_l3_remove,
249         .driver         = {
250                 .name           = "omap_l3_noc",
251                 .owner          = THIS_MODULE,
252                 .of_match_table = l3_noc_match,
253         },
254 };
255 
256 static int __init omap4_l3_init(void)
257 {
258         return platform_driver_register(&omap4_l3_driver);
259 }
260 postcore_initcall_sync(omap4_l3_init);
261 
262 static void __exit omap4_l3_exit(void)
263 {
264         platform_driver_unregister(&omap4_l3_driver);
265 }
266 module_exit(omap4_l3_exit);
267 

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