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, k;
  60         int err_src = 0;
  61         u32 std_err_main, err_reg, clear, masterid;
  62         void __iomem *base, *l3_targ_base;
  63         char *target_name, *master_name = "UN IDENTIFIED";
  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 = l3->l3_base[i];
  74                 err_reg = __raw_readl(base + l3_flagmux[i] +
  75                                         + L3_FLAGMUX_REGERR0 + (inttype << 3));
  76
  77                 /* Get the corresponding error and analyse */
  78                 if (err_reg) {
  79                         /* Identify the source from control status register */
  80                         err_src = __ffs(err_reg);
  81
  82                         /* Read the stderrlog_main_source from clk domain */
  83                         l3_targ_base = base + *(l3_targ[i] + err_src);
  84                         std_err_main =  __raw_readl(l3_targ_base +
  85                                         L3_TARG_STDERRLOG_MAIN);
  86                         masterid = __raw_readl(l3_targ_base +
  87                                         L3_TARG_STDERRLOG_MSTADDR);
  88
  89                         switch (std_err_main & CUSTOM_ERROR) {
  90                         case STANDARD_ERROR:
  91                                 target_name =
  92                                         l3_targ_inst_name[i][err_src];
  93                                 WARN(true, "L3 standard error: TARGET:%s at address 0x%x\n",
  94                                         target_name,
  95                                         __raw_readl(l3_targ_base +
  96                                                 L3_TARG_STDERRLOG_SLVOFSLSB));
  97                                 /* clear the std error log*/
  98                                 clear = std_err_main | CLEAR_STDERR_LOG;
  99                                 writel(clear, l3_targ_base +
 100                                         L3_TARG_STDERRLOG_MAIN);
 101                                 break;
 102
 103                         case CUSTOM_ERROR:
 104                                 target_name =
 105                                         l3_targ_inst_name[i][err_src];
 106                                 for (k = 0; k < NUM_OF_L3_MASTERS; k++) {
 107                                         if (masterid == l3_masters[k].id)
 108                                                 master_name =
 109                                                         l3_masters[k].name;
 110                                 }
 111                                 WARN(true, "L3 custom error: MASTER:%s TARGET:%s\n",
 112                                         master_name, target_name);
 113                                 /* clear the std error log*/
 114                                 clear = std_err_main | CLEAR_STDERR_LOG;
 115                                 writel(clear, l3_targ_base +
 116                                         L3_TARG_STDERRLOG_MAIN);
 117                                 break;
 118
 119                         default:
 120                                 /* Nothing to be handled here as of now */
 121                                 break;
 122                         }
 123                 /* Error found so break the for loop */
 124                 break;
 125                 }
 126         }
 127         return IRQ_HANDLED;
 128 }
 129
 130 static int __devinit omap4_l3_probe(struct platform_device *pdev)
 131 {
 132         static struct omap4_l3 *l3;
 133         struct resource *res;
 134         int ret;
 135
 136         l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
 137         if (!l3)
 138                 return -ENOMEM;
 139
 140         platform_set_drvdata(pdev, l3);
 141         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 142         if (!res) {
 143                 dev_err(&pdev->dev, "couldn't find resource 0\n");
 144                 ret = -ENODEV;
 145                 goto err0;
 146         }
 147
 148         l3->l3_base[0] = ioremap(res->start, resource_size(res));
 149         if (!l3->l3_base[0]) {
 150                 dev_err(&pdev->dev, "ioremap failed\n");
 151                 ret = -ENOMEM;
 152                 goto err0;
 153         }
 154
 155         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 156         if (!res) {
 157                 dev_err(&pdev->dev, "couldn't find resource 1\n");
 158                 ret = -ENODEV;
 159                 goto err1;
 160         }
 161
 162         l3->l3_base[1] = ioremap(res->start, resource_size(res));
 163         if (!l3->l3_base[1]) {
 164                 dev_err(&pdev->dev, "ioremap failed\n");
 165                 ret = -ENOMEM;
 166                 goto err1;
 167         }
 168
 169         res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
 170         if (!res) {
 171                 dev_err(&pdev->dev, "couldn't find resource 2\n");
 172                 ret = -ENODEV;
 173                 goto err2;
 174         }
 175
 176         l3->l3_base[2] = ioremap(res->start, resource_size(res));
 177         if (!l3->l3_base[2]) {
 178                 dev_err(&pdev->dev, "ioremap failed\n");
 179                 ret = -ENOMEM;
 180                 goto err2;
 181         }
 182
 183         /*
 184          * Setup interrupt Handlers
 185          */
 186         l3->debug_irq = platform_get_irq(pdev, 0);
 187         ret = request_irq(l3->debug_irq,
 188                         l3_interrupt_handler,
 189                         IRQF_DISABLED, "l3-dbg-irq", l3);
 190         if (ret) {
 191                 pr_crit("L3: request_irq failed to register for 0x%x\n",
 192                                                 OMAP44XX_IRQ_L3_DBG);
 193                 goto err3;
 194         }
 195
 196         l3->app_irq = platform_get_irq(pdev, 1);
 197         ret = request_irq(l3->app_irq,
 198                         l3_interrupt_handler,
 199                         IRQF_DISABLED, "l3-app-irq", l3);
 200         if (ret) {
 201                 pr_crit("L3: request_irq failed to register for 0x%x\n",
 202                                                 OMAP44XX_IRQ_L3_APP);
 203                 goto err4;
 204         }
 205
 206         return 0;
 207
 208 err4:
 209         free_irq(l3->debug_irq, l3);
 210 err3:
 211         iounmap(l3->l3_base[2]);
 212 err2:
 213         iounmap(l3->l3_base[1]);
 214 err1:
 215         iounmap(l3->l3_base[0]);
 216 err0:
 217         kfree(l3);
 218         return ret;
 219 }
 220
 221 static int __devexit omap4_l3_remove(struct platform_device *pdev)
 222 {
 223         struct omap4_l3 *l3 = platform_get_drvdata(pdev);
 224
 225         free_irq(l3->app_irq, l3);
 226         free_irq(l3->debug_irq, l3);
 227         iounmap(l3->l3_base[0]);
 228         iounmap(l3->l3_base[1]);
 229         iounmap(l3->l3_base[2]);
 230         kfree(l3);
 231
 232         return 0;
 233 }
 234
 235 #if defined(CONFIG_OF)
 236 static const struct of_device_id l3_noc_match[] = {
 237         {.compatible = "ti,omap4-l3-noc", },
 238         {},
 239 }
 240 MODULE_DEVICE_TABLE(of, l3_noc_match);
 241 #else
 242 #define l3_noc_match NULL
 243 #endif
 244
 245 static struct platform_driver omap4_l3_driver = {
 246         .probe          = omap4_l3_probe,
 247         .remove         = __devexit_p(omap4_l3_remove),
 248         .driver         = {
 249                 .name           = "omap_l3_noc",
 250                 .owner          = THIS_MODULE,
 251                 .of_match_table = l3_noc_match,
 252         },
 253 };
 254
 255 static int __init omap4_l3_init(void)
 256 {
 257         return platform_driver_register(&omap4_l3_driver);
 258 }
 259 postcore_initcall_sync(omap4_l3_init);
 260
 261 static void __exit omap4_l3_exit(void)
 262 {
 263         platform_driver_unregister(&omap4_l3_driver);
 264 }
 265 module_exit(omap4_l3_exit);