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 "soc.h"
  32 #include "omap_l3_noc.h"
  33
  34 /*
  35  * Interrupt Handler for L3 error detection.
  36  *      1) Identify the L3 clockdomain partition to which the error belongs to.
  37  *      2) Identify the slave where the error information is logged
  38  *      3) Print the logged information.
  39  *      4) Add dump stack to provide kernel trace.
  40  *
  41  * Two Types of errors :
  42  *      1) Custom errors in L3 :
  43  *              Target like DMM/FW/EMIF generates SRESP=ERR error
  44  *      2) Standard L3 error:
  45  *              - Unsupported CMD.
  46  *                      L3 tries to access target while it is idle
  47  *              - OCP disconnect.
  48  *              - Address hole error:
  49  *                      If DSS/ISS/FDIF/USBHOSTFS access a target where they
  50  *                      do not have connectivity, the error is logged in
  51  *                      their default target which is DMM2.
  52  *
  53  *      On High Secure devices, firewall errors are possible and those
  54  *      can be trapped as well. But the trapping is implemented as part
  55  *      secure software and hence need not be implemented here.
  56  */
  57 static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
  58 {
  59
  60         struct omap4_l3 *l3 = _l3;
  61         int inttype, i, k;
  62         int err_src = 0;
  63         u32 std_err_main, err_reg, clear, masterid;
  64         void __iomem *base, *l3_targ_base;
  65         char *target_name, *master_name = "UN IDENTIFIED";
  66
  67         /* Get the Type of interrupt */
  68         inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
  69
  70         for (i = 0; i < L3_MODULES; i++) {
  71                 /*
  72                  * Read the regerr register of the clock domain
  73                  * to determine the source
  74                  */
  75                 base = l3->l3_base[i];
  76                 err_reg = __raw_readl(base + l3_flagmux[i] +
  77                                         + L3_FLAGMUX_REGERR0 + (inttype << 3));
  78
  79                 /* Get the corresponding error and analyse */
  80                 if (err_reg) {
  81                         /* Identify the source from control status register */
  82                         err_src = __ffs(err_reg);
  83
  84                         /* Read the stderrlog_main_source from clk domain */
  85                         l3_targ_base = base + *(l3_targ[i] + err_src);
  86                         std_err_main =  __raw_readl(l3_targ_base +
  87                                         L3_TARG_STDERRLOG_MAIN);
  88                         masterid = __raw_readl(l3_targ_base +
  89                                         L3_TARG_STDERRLOG_MSTADDR);
  90
  91                         switch (std_err_main & CUSTOM_ERROR) {
  92                         case STANDARD_ERROR:
  93                                 target_name =
  94                                         l3_targ_inst_name[i][err_src];
  95                                 WARN(true, "L3 standard error: TARGET:%s at address 0x%x\n",
  96                                         target_name,
  97                                         __raw_readl(l3_targ_base +
  98                                                 L3_TARG_STDERRLOG_SLVOFSLSB));
  99                                 /* clear the std error log*/
 100                                 clear = std_err_main | CLEAR_STDERR_LOG;
 101                                 writel(clear, l3_targ_base +
 102                                         L3_TARG_STDERRLOG_MAIN);
 103                                 break;
 104
 105                         case CUSTOM_ERROR:
 106                                 target_name =
 107                                         l3_targ_inst_name[i][err_src];
 108                                 for (k = 0; k < NUM_OF_L3_MASTERS; k++) {
 109                                         if (masterid == l3_masters[k].id)
 110                                                 master_name =
 111                                                         l3_masters[k].name;
 112                                 }
 113                                 WARN(true, "L3 custom error: MASTER:%s TARGET:%s\n",
 114                                         master_name, target_name);
 115                                 /* clear the std error log*/
 116                                 clear = std_err_main | CLEAR_STDERR_LOG;
 117                                 writel(clear, l3_targ_base +
 118                                         L3_TARG_STDERRLOG_MAIN);
 119                                 break;
 120
 121                         default:
 122                                 /* Nothing to be handled here as of now */
 123                                 break;
 124                         }
 125                 /* Error found so break the for loop */
 126                 break;
 127                 }
 128         }
 129         return IRQ_HANDLED;
 130 }
 131
 132 static int __devinit omap4_l3_probe(struct platform_device *pdev)
 133 {
 134         static struct omap4_l3 *l3;
 135         struct resource *res;
 136         int ret;
 137
 138         l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
 139         if (!l3)
 140                 return -ENOMEM;
 141
 142         platform_set_drvdata(pdev, l3);
 143         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 144         if (!res) {
 145                 dev_err(&pdev->dev, "couldn't find resource 0\n");
 146                 ret = -ENODEV;
 147                 goto err0;
 148         }
 149
 150         l3->l3_base[0] = ioremap(res->start, resource_size(res));
 151         if (!l3->l3_base[0]) {
 152                 dev_err(&pdev->dev, "ioremap failed\n");
 153                 ret = -ENOMEM;
 154                 goto err0;
 155         }
 156
 157         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 158         if (!res) {
 159                 dev_err(&pdev->dev, "couldn't find resource 1\n");
 160                 ret = -ENODEV;
 161                 goto err1;
 162         }
 163
 164         l3->l3_base[1] = ioremap(res->start, resource_size(res));
 165         if (!l3->l3_base[1]) {
 166                 dev_err(&pdev->dev, "ioremap failed\n");
 167                 ret = -ENOMEM;
 168                 goto err1;
 169         }
 170
 171         res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
 172         if (!res) {
 173                 dev_err(&pdev->dev, "couldn't find resource 2\n");
 174                 ret = -ENODEV;
 175                 goto err2;
 176         }
 177
 178         l3->l3_base[2] = ioremap(res->start, resource_size(res));
 179         if (!l3->l3_base[2]) {
 180                 dev_err(&pdev->dev, "ioremap failed\n");
 181                 ret = -ENOMEM;
 182                 goto err2;
 183         }
 184
 185         /*
 186          * Setup interrupt Handlers
 187          */
 188         l3->debug_irq = platform_get_irq(pdev, 0);
 189         ret = request_irq(l3->debug_irq,
 190                         l3_interrupt_handler,
 191                         IRQF_DISABLED, "l3-dbg-irq", l3);
 192         if (ret) {
 193                 pr_crit("L3: request_irq failed to register for 0x%x\n",
 194                                                 l3->debug_irq);
 195                 goto err3;
 196         }
 197
 198         l3->app_irq = platform_get_irq(pdev, 1);
 199         ret = request_irq(l3->app_irq,
 200                         l3_interrupt_handler,
 201                         IRQF_DISABLED, "l3-app-irq", l3);
 202         if (ret) {
 203                 pr_crit("L3: request_irq failed to register for 0x%x\n",
 204                                                 l3->app_irq);
 205                 goto err4;
 206         }
 207
 208         return 0;
 209
 210 err4:
 211         free_irq(l3->debug_irq, l3);
 212 err3:
 213         iounmap(l3->l3_base[2]);
 214 err2:
 215         iounmap(l3->l3_base[1]);
 216 err1:
 217         iounmap(l3->l3_base[0]);
 218 err0:
 219         kfree(l3);
 220         return ret;
 221 }
 222
 223 static int __devexit omap4_l3_remove(struct platform_device *pdev)
 224 {
 225         struct omap4_l3 *l3 = platform_get_drvdata(pdev);
 226
 227         free_irq(l3->app_irq, l3);
 228         free_irq(l3->debug_irq, l3);
 229         iounmap(l3->l3_base[0]);
 230         iounmap(l3->l3_base[1]);
 231         iounmap(l3->l3_base[2]);
 232         kfree(l3);
 233
 234         return 0;
 235 }
 236
 237 #if defined(CONFIG_OF)
 238 static const struct of_device_id l3_noc_match[] = {
 239         {.compatible = "ti,omap4-l3-noc", },
 240         {},
 241 };
 242 MODULE_DEVICE_TABLE(of, l3_noc_match);
 243 #else
 244 #define l3_noc_match NULL
 245 #endif
 246
 247 static struct platform_driver omap4_l3_driver = {
 248         .probe          = omap4_l3_probe,
 249         .remove         = __devexit_p(omap4_l3_remove),
 250         .driver         = {
 251                 .name           = "omap_l3_noc",
 252                 .owner          = THIS_MODULE,
 253                 .of_match_table = l3_noc_match,
 254         },
 255 };
 256
 257 static int __init omap4_l3_init(void)
 258 {
 259         return platform_driver_register(&omap4_l3_driver);
 260 }
 261 postcore_initcall_sync(omap4_l3_init);
 262
 263 static void __exit omap4_l3_exit(void)
 264 {
 265         platform_driver_unregister(&omap4_l3_driver);
 266 }
 267 module_exit(omap4_l3_exit);