1 /* 2 * OMAP L3 Interconnect error handling driver 3 * 4 * Copyright (C) 2011-2015 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/init.h> 18 #include <linux/interrupt.h> 19 #include <linux/io.h> 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/of_device.h> 23 #include <linux/of.h> 24 #include <linux/platform_device.h> 25 #include <linux/slab.h> 26 27 #include "omap_l3_noc.h" 28 29 /** 30 * l3_handle_target() - Handle Target specific parse and reporting 31 * @l3: pointer to l3 struct 32 * @base: base address of clkdm 33 * @flag_mux: flagmux corresponding to the event 34 * @err_src: error source index of the slave (target) 35 * 36 * This does the second part of the error interrupt handling: 37 * 3) Parse in the slave information 38 * 4) Print the logged information. 39 * 5) Add dump stack to provide kernel trace. 40 * 6) Clear the source if known. 41 * 42 * This handles two types of errors: 43 * 1) Custom errors in L3 : 44 * Target like DMM/FW/EMIF generates SRESP=ERR error 45 * 2) Standard L3 error: 46 * - Unsupported CMD. 47 * L3 tries to access target while it is idle 48 * - OCP disconnect. 49 * - Address hole error: 50 * If DSS/ISS/FDIF/USBHOSTFS access a target where they 51 * do not have connectivity, the error is logged in 52 * their default target which is DMM2. 53 * 54 * On High Secure devices, firewall errors are possible and those 55 * can be trapped as well. But the trapping is implemented as part 56 * secure software and hence need not be implemented here. 57 */ 58 static int l3_handle_target(struct omap_l3 *l3, void __iomem *base, 59 struct l3_flagmux_data *flag_mux, int err_src) 60 { 61 int k; 62 u32 std_err_main, clear, masterid; 63 u8 op_code, m_req_info; 64 void __iomem *l3_targ_base; 65 void __iomem *l3_targ_stderr, *l3_targ_slvofslsb, *l3_targ_mstaddr; 66 void __iomem *l3_targ_hdr, *l3_targ_info; 67 struct l3_target_data *l3_targ_inst; 68 struct l3_masters_data *master; 69 char *target_name, *master_name = "UN IDENTIFIED"; 70 char *err_description; 71 char err_string[30] = { 0 }; 72 char info_string[60] = { 0 }; 73 74 /* We DONOT expect err_src to go out of bounds */ 75 BUG_ON(err_src > MAX_CLKDM_TARGETS); 76 77 if (err_src < flag_mux->num_targ_data) { 78 l3_targ_inst = &flag_mux->l3_targ[err_src]; 79 target_name = l3_targ_inst->name; 80 l3_targ_base = base + l3_targ_inst->offset; 81 } else { 82 target_name = L3_TARGET_NOT_SUPPORTED; 83 } 84 85 if (target_name == L3_TARGET_NOT_SUPPORTED) 86 return -ENODEV; 87 88 /* Read the stderrlog_main_source from clk domain */ 89 l3_targ_stderr = l3_targ_base + L3_TARG_STDERRLOG_MAIN; 90 l3_targ_slvofslsb = l3_targ_base + L3_TARG_STDERRLOG_SLVOFSLSB; 91 92 std_err_main = readl_relaxed(l3_targ_stderr); 93 94 switch (std_err_main & CUSTOM_ERROR) { 95 case STANDARD_ERROR: 96 err_description = "Standard"; 97 snprintf(err_string, sizeof(err_string), 98 ": At Address: 0x%08X ", 99 readl_relaxed(l3_targ_slvofslsb)); 100 101 l3_targ_mstaddr = l3_targ_base + L3_TARG_STDERRLOG_MSTADDR; 102 l3_targ_hdr = l3_targ_base + L3_TARG_STDERRLOG_HDR; 103 l3_targ_info = l3_targ_base + L3_TARG_STDERRLOG_INFO; 104 break; 105 106 case CUSTOM_ERROR: 107 err_description = "Custom"; 108 109 l3_targ_mstaddr = l3_targ_base + 110 L3_TARG_STDERRLOG_CINFO_MSTADDR; 111 l3_targ_hdr = l3_targ_base + L3_TARG_STDERRLOG_CINFO_OPCODE; 112 l3_targ_info = l3_targ_base + L3_TARG_STDERRLOG_CINFO_INFO; 113 break; 114 115 default: 116 /* Nothing to be handled here as of now */ 117 return 0; 118 } 119 120 /* STDERRLOG_MSTADDR Stores the NTTP master address. */ 121 masterid = (readl_relaxed(l3_targ_mstaddr) & 122 l3->mst_addr_mask) >> __ffs(l3->mst_addr_mask); 123 124 for (k = 0, master = l3->l3_masters; k < l3->num_masters; 125 k++, master++) { 126 if (masterid == master->id) { 127 master_name = master->name; 128 break; 129 } 130 } 131 132 op_code = readl_relaxed(l3_targ_hdr) & 0x7; 133 134 m_req_info = readl_relaxed(l3_targ_info) & 0xF; 135 snprintf(info_string, sizeof(info_string), 136 ": %s in %s mode during %s access", 137 (m_req_info & BIT(0)) ? "Opcode Fetch" : "Data Access", 138 (m_req_info & BIT(1)) ? "Supervisor" : "User", 139 (m_req_info & BIT(3)) ? "Debug" : "Functional"); 140 141 WARN(true, 142 "%s:L3 %s Error: MASTER %s TARGET %s (%s)%s%s\n", 143 dev_name(l3->dev), 144 err_description, 145 master_name, target_name, 146 l3_transaction_type[op_code], 147 err_string, info_string); 148 149 /* clear the std error log*/ 150 clear = std_err_main | CLEAR_STDERR_LOG; 151 writel_relaxed(clear, l3_targ_stderr); 152 153 return 0; 154 } 155 156 /** 157 * l3_interrupt_handler() - interrupt handler for l3 events 158 * @irq: irq number 159 * @_l3: pointer to l3 structure 160 * 161 * Interrupt Handler for L3 error detection. 162 * 1) Identify the L3 clockdomain partition to which the error belongs to. 163 * 2) Identify the slave where the error information is logged 164 * ... handle the slave event.. 165 * 7) if the slave is unknown, mask out the slave. 166 */ 167 static irqreturn_t l3_interrupt_handler(int irq, void *_l3) 168 { 169 struct omap_l3 *l3 = _l3; 170 int inttype, i, ret; 171 int err_src = 0; 172 u32 err_reg, mask_val; 173 void __iomem *base, *mask_reg; 174 struct l3_flagmux_data *flag_mux; 175 176 /* Get the Type of interrupt */ 177 inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR; 178 179 for (i = 0; i < l3->num_modules; i++) { 180 /* 181 * Read the regerr register of the clock domain 182 * to determine the source 183 */ 184 base = l3->l3_base[i]; 185 flag_mux = l3->l3_flagmux[i]; 186 err_reg = readl_relaxed(base + flag_mux->offset + 187 L3_FLAGMUX_REGERR0 + (inttype << 3)); 188 189 err_reg &= ~(inttype ? flag_mux->mask_app_bits : 190 flag_mux->mask_dbg_bits); 191 192 /* Get the corresponding error and analyse */ 193 if (err_reg) { 194 /* Identify the source from control status register */ 195 err_src = __ffs(err_reg); 196 197 ret = l3_handle_target(l3, base, flag_mux, err_src); 198 199 /* 200 * Certain plaforms may have "undocumented" status 201 * pending on boot. So dont generate a severe warning 202 * here. Just mask it off to prevent the error from 203 * reoccuring and locking up the system. 204 */ 205 if (ret) { 206 dev_err(l3->dev, 207 "L3 %s error: target %d mod:%d %s\n", 208 inttype ? "debug" : "application", 209 err_src, i, "(unclearable)"); 210 211 mask_reg = base + flag_mux->offset + 212 L3_FLAGMUX_MASK0 + (inttype << 3); 213 mask_val = readl_relaxed(mask_reg); 214 mask_val &= ~(1 << err_src); 215 writel_relaxed(mask_val, mask_reg); 216 217 /* Mark these bits as to be ignored */ 218 if (inttype) 219 flag_mux->mask_app_bits |= 1 << err_src; 220 else 221 flag_mux->mask_dbg_bits |= 1 << err_src; 222 } 223 224 /* Error found so break the for loop */ 225 return IRQ_HANDLED; 226 } 227 } 228 229 dev_err(l3->dev, "L3 %s IRQ not handled!!\n", 230 inttype ? "debug" : "application"); 231 232 return IRQ_NONE; 233 } 234 235 static const struct of_device_id l3_noc_match[] = { 236 {.compatible = "ti,omap4-l3-noc", .data = &omap4_l3_data}, 237 {.compatible = "ti,omap5-l3-noc", .data = &omap5_l3_data}, 238 {.compatible = "ti,dra7-l3-noc", .data = &dra_l3_data}, 239 {.compatible = "ti,am4372-l3-noc", .data = &am4372_l3_data}, 240 {}, 241 }; 242 MODULE_DEVICE_TABLE(of, l3_noc_match); 243 244 static int omap_l3_probe(struct platform_device *pdev) 245 { 246 const struct of_device_id *of_id; 247 static struct omap_l3 *l3; 248 int ret, i, res_idx; 249 250 of_id = of_match_device(l3_noc_match, &pdev->dev); 251 if (!of_id) { 252 dev_err(&pdev->dev, "OF data missing\n"); 253 return -EINVAL; 254 } 255 256 l3 = devm_kzalloc(&pdev->dev, sizeof(*l3), GFP_KERNEL); 257 if (!l3) 258 return -ENOMEM; 259 260 memcpy(l3, of_id->data, sizeof(*l3)); 261 l3->dev = &pdev->dev; 262 platform_set_drvdata(pdev, l3); 263 264 /* Get mem resources */ 265 for (i = 0, res_idx = 0; i < l3->num_modules; i++) { 266 struct resource *res; 267 268 if (l3->l3_base[i] == L3_BASE_IS_SUBMODULE) { 269 /* First entry cannot be submodule */ 270 BUG_ON(i == 0); 271 l3->l3_base[i] = l3->l3_base[i - 1]; 272 continue; 273 } 274 res = platform_get_resource(pdev, IORESOURCE_MEM, res_idx); 275 l3->l3_base[i] = devm_ioremap_resource(&pdev->dev, res); 276 if (IS_ERR(l3->l3_base[i])) { 277 dev_err(l3->dev, "ioremap %d failed\n", i); 278 return PTR_ERR(l3->l3_base[i]); 279 } 280 res_idx++; 281 } 282 283 /* 284 * Setup interrupt Handlers 285 */ 286 l3->debug_irq = platform_get_irq(pdev, 0); 287 ret = devm_request_irq(l3->dev, l3->debug_irq, l3_interrupt_handler, 288 IRQF_NO_THREAD, "l3-dbg-irq", l3); 289 if (ret) { 290 dev_err(l3->dev, "request_irq failed for %d\n", 291 l3->debug_irq); 292 return ret; 293 } 294 295 l3->app_irq = platform_get_irq(pdev, 1); 296 ret = devm_request_irq(l3->dev, l3->app_irq, l3_interrupt_handler, 297 IRQF_NO_THREAD, "l3-app-irq", l3); 298 if (ret) 299 dev_err(l3->dev, "request_irq failed for %d\n", l3->app_irq); 300 301 return ret; 302 } 303 304 #ifdef CONFIG_PM_SLEEP 305 306 /** 307 * l3_resume_noirq() - resume function for l3_noc 308 * @dev: pointer to l3_noc device structure 309 * 310 * We only have the resume handler only since we 311 * have already maintained the delta register 312 * configuration as part of configuring the system 313 */ 314 static int l3_resume_noirq(struct device *dev) 315 { 316 struct omap_l3 *l3 = dev_get_drvdata(dev); 317 int i; 318 struct l3_flagmux_data *flag_mux; 319 void __iomem *base, *mask_regx = NULL; 320 u32 mask_val; 321 322 for (i = 0; i < l3->num_modules; i++) { 323 base = l3->l3_base[i]; 324 flag_mux = l3->l3_flagmux[i]; 325 if (!flag_mux->mask_app_bits && !flag_mux->mask_dbg_bits) 326 continue; 327 328 mask_regx = base + flag_mux->offset + L3_FLAGMUX_MASK0 + 329 (L3_APPLICATION_ERROR << 3); 330 mask_val = readl_relaxed(mask_regx); 331 mask_val &= ~(flag_mux->mask_app_bits); 332 333 writel_relaxed(mask_val, mask_regx); 334 mask_regx = base + flag_mux->offset + L3_FLAGMUX_MASK0 + 335 (L3_DEBUG_ERROR << 3); 336 mask_val = readl_relaxed(mask_regx); 337 mask_val &= ~(flag_mux->mask_dbg_bits); 338 339 writel_relaxed(mask_val, mask_regx); 340 } 341 342 /* Dummy read to force OCP barrier */ 343 if (mask_regx) 344 (void)readl(mask_regx); 345 346 return 0; 347 } 348 349 static const struct dev_pm_ops l3_dev_pm_ops = { 350 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(NULL, l3_resume_noirq) 351 }; 352 353 #define L3_DEV_PM_OPS (&l3_dev_pm_ops) 354 #else 355 #define L3_DEV_PM_OPS NULL 356 #endif 357 358 static struct platform_driver omap_l3_driver = { 359 .probe = omap_l3_probe, 360 .driver = { 361 .name = "omap_l3_noc", 362 .pm = L3_DEV_PM_OPS, 363 .of_match_table = of_match_ptr(l3_noc_match), 364 }, 365 }; 366 367 static int __init omap_l3_init(void) 368 { 369 return platform_driver_register(&omap_l3_driver); 370 } 371 postcore_initcall_sync(omap_l3_init); 372 373 static void __exit omap_l3_exit(void) 374 { 375 platform_driver_unregister(&omap_l3_driver); 376 } 377 module_exit(omap_l3_exit); 378 379 MODULE_AUTHOR("Santosh Shilimkar"); 380 MODULE_AUTHOR("Sricharan R"); 381 MODULE_DESCRIPTION("OMAP L3 Interconnect error handling driver"); 382 MODULE_LICENSE("GPL v2"); 383