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);