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/module.h> 24 #include <linux/init.h> 25 #include <linux/io.h> 26 #include <linux/platform_device.h> 27 #include <linux/interrupt.h> 28 #include <linux/kernel.h> 29 #include <linux/slab.h> 30 31 #include "omap_l3_noc.h" 32 33 /* 34 * Interrupt Handler for L3 error detection. 35 * 1) Identify the L3 clockdomain partition to which the error belongs to. 36 * 2) Identify the slave where the error information is logged 37 * 3) Print the logged information. 38 * 4) Add dump stack to provide kernel trace. 39 * 40 * Two Types of errors : 41 * 1) Custom errors in L3 : 42 * Target like DMM/FW/EMIF generates SRESP=ERR error 43 * 2) Standard L3 error: 44 * - Unsupported CMD. 45 * L3 tries to access target while it is idle 46 * - OCP disconnect. 47 * - Address hole error: 48 * If DSS/ISS/FDIF/USBHOSTFS access a target where they 49 * do not have connectivity, the error is logged in 50 * their default target which is DMM2. 51 * 52 * On High Secure devices, firewall errors are possible and those 53 * can be trapped as well. But the trapping is implemented as part 54 * secure software and hence need not be implemented here. 55 */ 56 static irqreturn_t l3_interrupt_handler(int irq, void *_l3) 57 { 58 59 struct omap4_l3 *l3 = _l3; 60 int inttype, i, k; 61 int err_src = 0; 62 u32 std_err_main, err_reg, clear, masterid; 63 void __iomem *base, *l3_targ_base; 64 char *target_name, *master_name = "UN IDENTIFIED"; 65 66 /* Get the Type of interrupt */ 67 inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR; 68 69 for (i = 0; i < L3_MODULES; i++) { 70 /* 71 * Read the regerr register of the clock domain 72 * to determine the source 73 */ 74 base = l3->l3_base[i]; 75 err_reg = __raw_readl(base + l3_flagmux[i] + 76 + L3_FLAGMUX_REGERR0 + (inttype << 3)); 77 78 /* Get the corresponding error and analyse */ 79 if (err_reg) { 80 /* Identify the source from control status register */ 81 err_src = __ffs(err_reg); 82 83 /* Read the stderrlog_main_source from clk domain */ 84 l3_targ_base = base + *(l3_targ[i] + err_src); 85 std_err_main = __raw_readl(l3_targ_base + 86 L3_TARG_STDERRLOG_MAIN); 87 masterid = __raw_readl(l3_targ_base + 88 L3_TARG_STDERRLOG_MSTADDR); 89 90 switch (std_err_main & CUSTOM_ERROR) { 91 case STANDARD_ERROR: 92 target_name = 93 l3_targ_inst_name[i][err_src]; 94 WARN(true, "L3 standard error: TARGET:%s at address 0x%x\n", 95 target_name, 96 __raw_readl(l3_targ_base + 97 L3_TARG_STDERRLOG_SLVOFSLSB)); 98 /* clear the std error log*/ 99 clear = std_err_main | CLEAR_STDERR_LOG; 100 writel(clear, l3_targ_base + 101 L3_TARG_STDERRLOG_MAIN); 102 break; 103 104 case CUSTOM_ERROR: 105 target_name = 106 l3_targ_inst_name[i][err_src]; 107 for (k = 0; k < NUM_OF_L3_MASTERS; k++) { 108 if (masterid == l3_masters[k].id) 109 master_name = 110 l3_masters[k].name; 111 } 112 WARN(true, "L3 custom error: MASTER:%s TARGET:%s\n", 113 master_name, target_name); 114 /* clear the std error log*/ 115 clear = std_err_main | CLEAR_STDERR_LOG; 116 writel(clear, l3_targ_base + 117 L3_TARG_STDERRLOG_MAIN); 118 break; 119 120 default: 121 /* Nothing to be handled here as of now */ 122 break; 123 } 124 /* Error found so break the for loop */ 125 break; 126 } 127 } 128 return IRQ_HANDLED; 129 } 130 131 static int omap4_l3_probe(struct platform_device *pdev) 132 { 133 static struct omap4_l3 *l3; 134 struct resource *res; 135 int ret; 136 137 l3 = kzalloc(sizeof(*l3), GFP_KERNEL); 138 if (!l3) 139 return -ENOMEM; 140 141 platform_set_drvdata(pdev, l3); 142 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 143 if (!res) { 144 dev_err(&pdev->dev, "couldn't find resource 0\n"); 145 ret = -ENODEV; 146 goto err0; 147 } 148 149 l3->l3_base[0] = ioremap(res->start, resource_size(res)); 150 if (!l3->l3_base[0]) { 151 dev_err(&pdev->dev, "ioremap failed\n"); 152 ret = -ENOMEM; 153 goto err0; 154 } 155 156 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 157 if (!res) { 158 dev_err(&pdev->dev, "couldn't find resource 1\n"); 159 ret = -ENODEV; 160 goto err1; 161 } 162 163 l3->l3_base[1] = ioremap(res->start, resource_size(res)); 164 if (!l3->l3_base[1]) { 165 dev_err(&pdev->dev, "ioremap failed\n"); 166 ret = -ENOMEM; 167 goto err1; 168 } 169 170 res = platform_get_resource(pdev, IORESOURCE_MEM, 2); 171 if (!res) { 172 dev_err(&pdev->dev, "couldn't find resource 2\n"); 173 ret = -ENODEV; 174 goto err2; 175 } 176 177 l3->l3_base[2] = ioremap(res->start, resource_size(res)); 178 if (!l3->l3_base[2]) { 179 dev_err(&pdev->dev, "ioremap failed\n"); 180 ret = -ENOMEM; 181 goto err2; 182 } 183 184 /* 185 * Setup interrupt Handlers 186 */ 187 l3->debug_irq = platform_get_irq(pdev, 0); 188 ret = request_irq(l3->debug_irq, 189 l3_interrupt_handler, 190 IRQF_DISABLED, "l3-dbg-irq", l3); 191 if (ret) { 192 pr_crit("L3: request_irq failed to register for 0x%x\n", 193 l3->debug_irq); 194 goto err3; 195 } 196 197 l3->app_irq = platform_get_irq(pdev, 1); 198 ret = request_irq(l3->app_irq, 199 l3_interrupt_handler, 200 IRQF_DISABLED, "l3-app-irq", l3); 201 if (ret) { 202 pr_crit("L3: request_irq failed to register for 0x%x\n", 203 l3->app_irq); 204 goto err4; 205 } 206 207 return 0; 208 209 err4: 210 free_irq(l3->debug_irq, l3); 211 err3: 212 iounmap(l3->l3_base[2]); 213 err2: 214 iounmap(l3->l3_base[1]); 215 err1: 216 iounmap(l3->l3_base[0]); 217 err0: 218 kfree(l3); 219 return ret; 220 } 221 222 static int omap4_l3_remove(struct platform_device *pdev) 223 { 224 struct omap4_l3 *l3 = platform_get_drvdata(pdev); 225 226 free_irq(l3->app_irq, l3); 227 free_irq(l3->debug_irq, l3); 228 iounmap(l3->l3_base[0]); 229 iounmap(l3->l3_base[1]); 230 iounmap(l3->l3_base[2]); 231 kfree(l3); 232 233 return 0; 234 } 235 236 #if defined(CONFIG_OF) 237 static const struct of_device_id l3_noc_match[] = { 238 {.compatible = "ti,omap4-l3-noc", }, 239 {}, 240 }; 241 MODULE_DEVICE_TABLE(of, l3_noc_match); 242 #else 243 #define l3_noc_match NULL 244 #endif 245 246 static struct platform_driver omap4_l3_driver = { 247 .probe = omap4_l3_probe, 248 .remove = omap4_l3_remove, 249 .driver = { 250 .name = "omap_l3_noc", 251 .owner = THIS_MODULE, 252 .of_match_table = l3_noc_match, 253 }, 254 }; 255 256 static int __init omap4_l3_init(void) 257 { 258 return platform_driver_register(&omap4_l3_driver); 259 } 260 postcore_initcall_sync(omap4_l3_init); 261 262 static void __exit omap4_l3_exit(void) 263 { 264 platform_driver_unregister(&omap4_l3_driver); 265 } 266 module_exit(omap4_l3_exit); 267