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;
  60         int err_src = 0;
  61         u32 std_err_main, err_reg, clear, base, l3_targ_base;
  62         char *source_name;
  63
  64         /* Get the Type of interrupt */
  65         inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
  66
  67         for (i = 0; i < L3_MODULES; i++) {
  68                 /*
  69                  * Read the regerr register of the clock domain
  70                  * to determine the source
  71                  */
  72                 base = (u32)l3->l3_base[i];
  73                 err_reg = readl(base + l3_flagmux[i] +
  74                                         + L3_FLAGMUX_REGERR0 + (inttype << 3));
  75
  76                 /* Get the corresponding error and analyse */
  77                 if (err_reg) {
  78                         /* Identify the source from control status register */
  79                         err_src = __ffs(err_reg);
  80
  81                         /* Read the stderrlog_main_source from clk domain */
  82                         l3_targ_base = base + *(l3_targ[i] + err_src);
  83                         std_err_main =  readl(l3_targ_base +
  84                                         L3_TARG_STDERRLOG_MAIN);
  85
  86                         switch (std_err_main & CUSTOM_ERROR) {
  87                         case STANDARD_ERROR:
  88                                 source_name =
  89                                         l3_targ_inst_name[i][err_src];
  90                                 WARN(true, "L3 standard error: SOURCE:%s at address 0x%x\n",
  91                                         source_name,
  92                                         readl(l3_targ_base +
  93                                                 L3_TARG_STDERRLOG_SLVOFSLSB));
  94                                 /* clear the std error log*/
  95                                 clear = std_err_main | CLEAR_STDERR_LOG;
  96                                 writel(clear, l3_targ_base +
  97                                         L3_TARG_STDERRLOG_MAIN);
  98                                 break;
  99
 100                         case CUSTOM_ERROR:
 101                                 source_name =
 102                                         l3_targ_inst_name[i][err_src];
 103
 104                                 WARN(true, "L3 custom error: SOURCE:%s\n",
 105                                         source_name);
 106                                 /* clear the std error log*/
 107                                 clear = std_err_main | CLEAR_STDERR_LOG;
 108                                 writel(clear, l3_targ_base +
 109                                         L3_TARG_STDERRLOG_MAIN);
 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
 129         l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
 130         if (!l3)
 131                 return -ENOMEM;
 132
 133         platform_set_drvdata(pdev, l3);
 134         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 135         if (!res) {
 136                 dev_err(&pdev->dev, "couldn't find resource 0\n");
 137                 ret = -ENODEV;
 138                 goto err0;
 139         }
 140
 141         l3->l3_base[0] = ioremap(res->start, resource_size(res));
 142         if (!l3->l3_base[0]) {
 143                 dev_err(&pdev->dev, "ioremap failed\n");
 144                 ret = -ENOMEM;
 145                 goto err0;
 146         }
 147
 148         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 149         if (!res) {
 150                 dev_err(&pdev->dev, "couldn't find resource 1\n");
 151                 ret = -ENODEV;
 152                 goto err1;
 153         }
 154
 155         l3->l3_base[1] = ioremap(res->start, resource_size(res));
 156         if (!l3->l3_base[1]) {
 157                 dev_err(&pdev->dev, "ioremap failed\n");
 158                 ret = -ENOMEM;
 159                 goto err1;
 160         }
 161
 162         res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
 163         if (!res) {
 164                 dev_err(&pdev->dev, "couldn't find resource 2\n");
 165                 ret = -ENODEV;
 166                 goto err2;
 167         }
 168
 169         l3->l3_base[2] = ioremap(res->start, resource_size(res));
 170         if (!l3->l3_base[2]) {
 171                 dev_err(&pdev->dev, "ioremap failed\n");
 172                 ret = -ENOMEM;
 173                 goto err2;
 174         }
 175
 176         /*
 177          * Setup interrupt Handlers
 178          */
 179         l3->debug_irq = platform_get_irq(pdev, 0);
 180         ret = request_irq(l3->debug_irq,
 181                         l3_interrupt_handler,
 182                         IRQF_DISABLED, "l3-dbg-irq", l3);
 183         if (ret) {
 184                 pr_crit("L3: request_irq failed to register for 0x%x\n",
 185                                                 OMAP44XX_IRQ_L3_DBG);
 186                 goto err3;
 187         }
 188
 189         l3->app_irq = platform_get_irq(pdev, 1);
 190         ret = request_irq(l3->app_irq,
 191                         l3_interrupt_handler,
 192                         IRQF_DISABLED, "l3-app-irq", l3);
 193         if (ret) {
 194                 pr_crit("L3: request_irq failed to register for 0x%x\n",
 195                                                 OMAP44XX_IRQ_L3_APP);
 196                 goto err4;
 197         }
 198
 199         return 0;
 200
 201 err4:
 202         free_irq(l3->debug_irq, l3);
 203 err3:
 204         iounmap(l3->l3_base[2]);
 205 err2:
 206         iounmap(l3->l3_base[1]);
 207 err1:
 208         iounmap(l3->l3_base[0]);
 209 err0:
 210         kfree(l3);
 211         return ret;
 212 }
 213
 214 static int __exit omap4_l3_remove(struct platform_device *pdev)
 215 {
 216         struct omap4_l3 *l3 = platform_get_drvdata(pdev);
 217
 218         free_irq(l3->app_irq, l3);
 219         free_irq(l3->debug_irq, l3);
 220         iounmap(l3->l3_base[0]);
 221         iounmap(l3->l3_base[1]);
 222         iounmap(l3->l3_base[2]);
 223         kfree(l3);
 224
 225         return 0;
 226 }
 227
 228 static struct platform_driver omap4_l3_driver = {
 229         .remove = __exit_p(omap4_l3_remove),
 230         .driver = {
 231         .name = "omap_l3_noc",
 232         },
 233 };
 234
 235 static int __init omap4_l3_init(void)
 236 {
 237         return platform_driver_probe(&omap4_l3_driver, omap4_l3_probe);
 238 }
 239 postcore_initcall_sync(omap4_l3_init);
 240
 241 static void __exit omap4_l3_exit(void)
 242 {
 243         platform_driver_unregister(&omap4_l3_driver);
 244 }
 245 module_exit(omap4_l3_exit);