drivers/bus/omap_l3_noc.c

   1 /*
   2  * OMAP L3 Interconnect error handling driver
   3  *
   4  * Copyright (C) 2011-2014 Texas Instruments Incorporated - http://www.ti.com/
   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 version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  13  * kind, whether express or implied; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/io.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/kernel.h>
  23 #include <linux/slab.h>
  24
  25 #include "omap_l3_noc.h"
  26
  27 /*
  28  * Interrupt Handler for L3 error detection.
  29  *      1) Identify the L3 clockdomain partition to which the error belongs to.
  30  *      2) Identify the slave where the error information is logged
  31  *      3) Print the logged information.
  32  *      4) Add dump stack to provide kernel trace.
  33  *
  34  * Two Types of errors :
  35  *      1) Custom errors in L3 :
  36  *              Target like DMM/FW/EMIF generates SRESP=ERR error
  37  *      2) Standard L3 error:
  38  *              - Unsupported CMD.
  39  *                      L3 tries to access target while it is idle
  40  *              - OCP disconnect.
  41  *              - Address hole error:
  42  *                      If DSS/ISS/FDIF/USBHOSTFS access a target where they
  43  *                      do not have connectivity, the error is logged in
  44  *                      their default target which is DMM2.
  45  *
  46  *      On High Secure devices, firewall errors are possible and those
  47  *      can be trapped as well. But the trapping is implemented as part
  48  *      secure software and hence need not be implemented here.
  49  */
  50 static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
  51 {
  52
  53         struct omap_l3 *l3 = _l3;
  54         int inttype, i, k;
  55         int err_src = 0;
  56         u32 std_err_main, err_reg, clear, masterid;
  57         void __iomem *base, *l3_targ_base;
  58         void __iomem *l3_targ_stderr, *l3_targ_slvofslsb, *l3_targ_mstaddr;
  59         char *target_name, *master_name = "UN IDENTIFIED";
  60
  61         /* Get the Type of interrupt */
  62         inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
  63
  64         for (i = 0; i < L3_MODULES; i++) {
  65                 /*
  66                  * Read the regerr register of the clock domain
  67                  * to determine the source
  68                  */
  69                 base = l3->l3_base[i];
  70                 err_reg = readl_relaxed(base + l3_flagmux[i] +
  71                                         L3_FLAGMUX_REGERR0 + (inttype << 3));
  72
  73                 /* Get the corresponding error and analyse */
  74                 if (err_reg) {
  75                         /* Identify the source from control status register */
  76                         err_src = __ffs(err_reg);
  77
  78                         /* Read the stderrlog_main_source from clk domain */
  79                         l3_targ_base = base + *(l3_targ[i] + err_src);
  80                         l3_targ_stderr = l3_targ_base + L3_TARG_STDERRLOG_MAIN;
  81                         l3_targ_slvofslsb = l3_targ_base +
  82                                             L3_TARG_STDERRLOG_SLVOFSLSB;
  83                         l3_targ_mstaddr = l3_targ_base +
  84                                           L3_TARG_STDERRLOG_MSTADDR;
  85
  86                         std_err_main = readl_relaxed(l3_targ_stderr);
  87                         masterid = readl_relaxed(l3_targ_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                                         readl_relaxed(l3_targ_slvofslsb));
  96                                 /* clear the std error log*/
  97                                 clear = std_err_main | CLEAR_STDERR_LOG;
  98                                 writel_relaxed(clear, l3_targ_stderr);
  99                                 break;
 100
 101                         case CUSTOM_ERROR:
 102                                 target_name =
 103                                         l3_targ_inst_name[i][err_src];
 104                                 for (k = 0; k < NUM_OF_L3_MASTERS; k++) {
 105                                         if (masterid == l3_masters[k].id)
 106                                                 master_name =
 107                                                         l3_masters[k].name;
 108                                 }
 109                                 WARN(true, "L3 custom error: MASTER:%s TARGET:%s\n",
 110                                         master_name, target_name);
 111                                 /* clear the std error log*/
 112                                 clear = std_err_main | CLEAR_STDERR_LOG;
 113                                 writel_relaxed(clear, l3_targ_stderr);
 114                                 break;
 115
 116                         default:
 117                                 /* Nothing to be handled here as of now */
 118                                 break;
 119                         }
 120                 /* Error found so break the for loop */
 121                 break;
 122                 }
 123         }
 124         return IRQ_HANDLED;
 125 }
 126
 127 static int omap_l3_probe(struct platform_device *pdev)
 128 {
 129         static struct omap_l3 *l3;
 130         int ret, i;
 131
 132         l3 = devm_kzalloc(&pdev->dev, sizeof(*l3), GFP_KERNEL);
 133         if (!l3)
 134                 return -ENOMEM;
 135
 136         l3->dev = &pdev->dev;
 137         platform_set_drvdata(pdev, l3);
 138
 139         /* Get mem resources */
 140         for (i = 0; i < L3_MODULES; i++) {
 141                 struct resource *res = platform_get_resource(pdev,
 142                                                              IORESOURCE_MEM, i);
 143
 144                 l3->l3_base[i] = devm_ioremap_resource(&pdev->dev, res);
 145                 if (IS_ERR(l3->l3_base[i])) {
 146                         dev_err(l3->dev, "ioremap %d failed\n", i);
 147                         return PTR_ERR(l3->l3_base[i]);
 148                 }
 149         }
 150
 151         /*
 152          * Setup interrupt Handlers
 153          */
 154         l3->debug_irq = platform_get_irq(pdev, 0);
 155         ret = devm_request_irq(l3->dev, l3->debug_irq, l3_interrupt_handler,
 156                                IRQF_DISABLED, "l3-dbg-irq", l3);
 157         if (ret) {
 158                 dev_err(l3->dev, "request_irq failed for %d\n",
 159                         l3->debug_irq);
 160                 return ret;
 161         }
 162
 163         l3->app_irq = platform_get_irq(pdev, 1);
 164         ret = devm_request_irq(l3->dev, l3->app_irq, l3_interrupt_handler,
 165                                IRQF_DISABLED, "l3-app-irq", l3);
 166         if (ret)
 167                 dev_err(l3->dev, "request_irq failed for %d\n", l3->app_irq);
 168
 169         return ret;
 170 }
 171
 172 #if defined(CONFIG_OF)
 173 static const struct of_device_id l3_noc_match[] = {
 174         {.compatible = "ti,omap4-l3-noc", },
 175         {},
 176 };
 177 MODULE_DEVICE_TABLE(of, l3_noc_match);
 178 #else
 179 #define l3_noc_match NULL
 180 #endif
 181
 182 static struct platform_driver omap_l3_driver = {
 183         .probe          = omap_l3_probe,
 184         .driver         = {
 185                 .name           = "omap_l3_noc",
 186                 .owner          = THIS_MODULE,
 187                 .of_match_table = l3_noc_match,
 188         },
 189 };
 190
 191 static int __init omap_l3_init(void)
 192 {
 193         return platform_driver_register(&omap_l3_driver);
 194 }
 195 postcore_initcall_sync(omap_l3_init);
 196
 197 static void __exit omap_l3_exit(void)
 198 {
 199         platform_driver_unregister(&omap_l3_driver);
 200 }
 201 module_exit(omap_l3_exit);