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                 return -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 err0;
 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 err0;
 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 err1;
 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 err1;
 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 err2;
 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 err2;
 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 err3;
 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 err4;
 202         }
 203         l3->app_irq = irq;
 204
 205         return 0;
 206
 207 err4:
 208         free_irq(l3->debug_irq, l3);
 209 err3:
 210         iounmap(l3->l3_base[2]);
 211 err2:
 212         iounmap(l3->l3_base[1]);
 213 err1:
 214         iounmap(l3->l3_base[0]);
 215 err0:
 216         kfree(l3);
 217         return ret;
 218 }
 219
 220 static int __exit omap4_l3_remove(struct platform_device *pdev)
 221 {
 222         struct omap4_l3         *l3 = platform_get_drvdata(pdev);
 223
 224         free_irq(l3->app_irq, l3);
 225         free_irq(l3->debug_irq, l3);
 226         iounmap(l3->l3_base[0]);
 227         iounmap(l3->l3_base[1]);
 228         iounmap(l3->l3_base[2]);
 229         kfree(l3);
 230
 231         return 0;
 232 }
 233
 234 static struct platform_driver omap4_l3_driver = {
 235         .remove         = __exit_p(omap4_l3_remove),
 236         .driver         = {
 237         .name           = "omap_l3_noc",
 238         },
 239 };
 240
 241 static int __init omap4_l3_init(void)
 242 {
 243         return platform_driver_probe(&omap4_l3_driver, omap4_l3_probe);
 244 }
 245 postcore_initcall_sync(omap4_l3_init);
 246
 247 static void __exit omap4_l3_exit(void)
 248 {
 249         platform_driver_unregister(&omap4_l3_driver);
 250 }
 251 module_exit(omap4_l3_exit);