1 /* 2 * OMAP3XXX L3 Interconnect Driver 3 * 4 * Copyright (C) 2011 Texas Corporation 5 * Felipe Balbi <balbi@ti.com> 6 * Santosh Shilimkar <santosh.shilimkar@ti.com> 7 * Sricharan <r.sricharan@ti.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 22 * USA 23 */ 24 25 #include <linux/kernel.h> 26 #include <linux/slab.h> 27 #include <linux/platform_device.h> 28 #include <linux/interrupt.h> 29 #include <linux/io.h> 30 #include <linux/module.h> 31 #include <linux/of.h> 32 #include <linux/of_device.h> 33 34 #include "omap_l3_smx.h" 35 36 static inline u64 omap3_l3_readll(void __iomem *base, u16 reg) 37 { 38 return __raw_readll(base + reg); 39 } 40 41 static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value) 42 { 43 __raw_writell(value, base + reg); 44 } 45 46 static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error) 47 { 48 return (error & 0x0f000000) >> L3_ERROR_LOG_CODE; 49 } 50 51 static inline u32 omap3_l3_decode_addr(u64 error_addr) 52 { 53 return error_addr & 0xffffffff; 54 } 55 56 static inline unsigned omap3_l3_decode_cmd(u64 error) 57 { 58 return (error & 0x07) >> L3_ERROR_LOG_CMD; 59 } 60 61 static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error) 62 { 63 return (error & 0xff00) >> L3_ERROR_LOG_INITID; 64 } 65 66 static inline unsigned omap3_l3_decode_req_info(u64 error) 67 { 68 return (error >> 32) & 0xffff; 69 } 70 71 static char *omap3_l3_code_string(u8 code) 72 { 73 switch (code) { 74 case OMAP_L3_CODE_NOERROR: 75 return "No Error"; 76 case OMAP_L3_CODE_UNSUP_CMD: 77 return "Unsupported Command"; 78 case OMAP_L3_CODE_ADDR_HOLE: 79 return "Address Hole"; 80 case OMAP_L3_CODE_PROTECT_VIOLATION: 81 return "Protection Violation"; 82 case OMAP_L3_CODE_IN_BAND_ERR: 83 return "In-band Error"; 84 case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT: 85 return "Request Timeout Not Accepted"; 86 case OMAP_L3_CODE_REQ_TOUT_NO_RESP: 87 return "Request Timeout, no response"; 88 default: 89 return "UNKNOWN error"; 90 } 91 } 92 93 static char *omap3_l3_initiator_string(u8 initid) 94 { 95 switch (initid) { 96 case OMAP_L3_LCD: 97 return "LCD"; 98 case OMAP_L3_SAD2D: 99 return "SAD2D"; 100 case OMAP_L3_IA_MPU_SS_1: 101 case OMAP_L3_IA_MPU_SS_2: 102 case OMAP_L3_IA_MPU_SS_3: 103 case OMAP_L3_IA_MPU_SS_4: 104 case OMAP_L3_IA_MPU_SS_5: 105 return "MPU"; 106 case OMAP_L3_IA_IVA_SS_1: 107 case OMAP_L3_IA_IVA_SS_2: 108 case OMAP_L3_IA_IVA_SS_3: 109 return "IVA_SS"; 110 case OMAP_L3_IA_IVA_SS_DMA_1: 111 case OMAP_L3_IA_IVA_SS_DMA_2: 112 case OMAP_L3_IA_IVA_SS_DMA_3: 113 case OMAP_L3_IA_IVA_SS_DMA_4: 114 case OMAP_L3_IA_IVA_SS_DMA_5: 115 case OMAP_L3_IA_IVA_SS_DMA_6: 116 return "IVA_SS_DMA"; 117 case OMAP_L3_IA_SGX: 118 return "SGX"; 119 case OMAP_L3_IA_CAM_1: 120 case OMAP_L3_IA_CAM_2: 121 case OMAP_L3_IA_CAM_3: 122 return "CAM"; 123 case OMAP_L3_IA_DAP: 124 return "DAP"; 125 case OMAP_L3_SDMA_WR_1: 126 case OMAP_L3_SDMA_WR_2: 127 return "SDMA_WR"; 128 case OMAP_L3_SDMA_RD_1: 129 case OMAP_L3_SDMA_RD_2: 130 case OMAP_L3_SDMA_RD_3: 131 case OMAP_L3_SDMA_RD_4: 132 return "SDMA_RD"; 133 case OMAP_L3_USBOTG: 134 return "USB_OTG"; 135 case OMAP_L3_USBHOST: 136 return "USB_HOST"; 137 default: 138 return "UNKNOWN Initiator"; 139 } 140 } 141 142 /* 143 * omap3_l3_block_irq - handles a register block's irq 144 * @l3: struct omap3_l3 * 145 * @base: register block base address 146 * @error: L3_ERROR_LOG register of our block 147 * 148 * Called in hard-irq context. Caller should take care of locking 149 * 150 * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error 151 * Analysis Sequence, we are following that sequence here, please 152 * refer to that Figure for more information on the subject. 153 */ 154 static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3, 155 u64 error, int error_addr) 156 { 157 u8 code = omap3_l3_decode_error_code(error); 158 u8 initid = omap3_l3_decode_initid(error); 159 u8 multi = error & L3_ERROR_LOG_MULTI; 160 u32 address = omap3_l3_decode_addr(error_addr); 161 162 pr_err("%s seen by %s %s at address %x\n", 163 omap3_l3_code_string(code), 164 omap3_l3_initiator_string(initid), 165 multi ? "Multiple Errors" : "", address); 166 WARN_ON(1); 167 168 return IRQ_HANDLED; 169 } 170 171 static irqreturn_t omap3_l3_app_irq(int irq, void *_l3) 172 { 173 struct omap3_l3 *l3 = _l3; 174 u64 status, clear; 175 u64 error; 176 u64 error_addr; 177 u64 err_source = 0; 178 void __iomem *base; 179 int int_type; 180 irqreturn_t ret = IRQ_NONE; 181 182 int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR; 183 if (!int_type) { 184 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0); 185 /* 186 * if we have a timeout error, there's nothing we can 187 * do besides rebooting the board. So let's BUG on any 188 * of such errors and handle the others. timeout error 189 * is severe and not expected to occur. 190 */ 191 BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK); 192 } else { 193 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1); 194 /* No timeout error for debug sources */ 195 } 196 197 /* identify the error source */ 198 err_source = __ffs(status); 199 200 base = l3->rt + omap3_l3_bases[int_type][err_source]; 201 error = omap3_l3_readll(base, L3_ERROR_LOG); 202 if (error) { 203 error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR); 204 ret |= omap3_l3_block_irq(l3, error, error_addr); 205 } 206 207 /* Clear the status register */ 208 clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) | 209 L3_AGENT_STATUS_CLEAR_TA; 210 omap3_l3_writell(base, L3_AGENT_STATUS, clear); 211 212 /* clear the error log register */ 213 omap3_l3_writell(base, L3_ERROR_LOG, error); 214 215 return ret; 216 } 217 218 #if IS_BUILTIN(CONFIG_OF) 219 static const struct of_device_id omap3_l3_match[] = { 220 { 221 .compatible = "ti,omap3-l3-smx", 222 }, 223 { }, 224 }; 225 MODULE_DEVICE_TABLE(of, omap3_l3_match); 226 #endif 227 228 static int omap3_l3_probe(struct platform_device *pdev) 229 { 230 struct omap3_l3 *l3; 231 struct resource *res; 232 int ret; 233 234 l3 = kzalloc(sizeof(*l3), GFP_KERNEL); 235 if (!l3) 236 return -ENOMEM; 237 238 platform_set_drvdata(pdev, l3); 239 240 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 241 if (!res) { 242 dev_err(&pdev->dev, "couldn't find resource\n"); 243 ret = -ENODEV; 244 goto err0; 245 } 246 l3->rt = ioremap(res->start, resource_size(res)); 247 if (!l3->rt) { 248 dev_err(&pdev->dev, "ioremap failed\n"); 249 ret = -ENOMEM; 250 goto err0; 251 } 252 253 l3->debug_irq = platform_get_irq(pdev, 0); 254 ret = request_irq(l3->debug_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING, 255 "l3-debug-irq", l3); 256 if (ret) { 257 dev_err(&pdev->dev, "couldn't request debug irq\n"); 258 goto err1; 259 } 260 261 l3->app_irq = platform_get_irq(pdev, 1); 262 ret = request_irq(l3->app_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING, 263 "l3-app-irq", l3); 264 if (ret) { 265 dev_err(&pdev->dev, "couldn't request app irq\n"); 266 goto err2; 267 } 268 269 return 0; 270 271 err2: 272 free_irq(l3->debug_irq, l3); 273 err1: 274 iounmap(l3->rt); 275 err0: 276 kfree(l3); 277 return ret; 278 } 279 280 static int omap3_l3_remove(struct platform_device *pdev) 281 { 282 struct omap3_l3 *l3 = platform_get_drvdata(pdev); 283 284 free_irq(l3->app_irq, l3); 285 free_irq(l3->debug_irq, l3); 286 iounmap(l3->rt); 287 kfree(l3); 288 289 return 0; 290 } 291 292 static struct platform_driver omap3_l3_driver = { 293 .probe = omap3_l3_probe, 294 .remove = omap3_l3_remove, 295 .driver = { 296 .name = "omap_l3_smx", 297 .of_match_table = of_match_ptr(omap3_l3_match), 298 }, 299 }; 300 301 static int __init omap3_l3_init(void) 302 { 303 return platform_driver_register(&omap3_l3_driver); 304 } 305 postcore_initcall_sync(omap3_l3_init); 306 307 static void __exit omap3_l3_exit(void) 308 { 309 platform_driver_unregister(&omap3_l3_driver); 310 } 311 module_exit(omap3_l3_exit); 312