1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * OMAP3XXX L3 Interconnect Driver 4 * 5 * Copyright (C) 2011 Texas Corporation 6 * Felipe Balbi <balbi@ti.com> 7 * Santosh Shilimkar <santosh.shilimkar@ti.com> 8 * Sricharan <r.sricharan@ti.com> 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/slab.h> 13 #include <linux/platform_device.h> 14 #include <linux/interrupt.h> 15 #include <linux/io.h> 16 #include <linux/module.h> 17 #include <linux/of.h> 18 #include <linux/of_device.h> 19 20 #include "omap_l3_smx.h" 21 22 static inline u64 omap3_l3_readll(void __iomem *base, u16 reg) 23 { 24 return __raw_readll(base + reg); 25 } 26 27 static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value) 28 { 29 __raw_writell(value, base + reg); 30 } 31 32 static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error) 33 { 34 return (error & 0x0f000000) >> L3_ERROR_LOG_CODE; 35 } 36 37 static inline u32 omap3_l3_decode_addr(u64 error_addr) 38 { 39 return error_addr & 0xffffffff; 40 } 41 42 static inline unsigned omap3_l3_decode_cmd(u64 error) 43 { 44 return (error & 0x07) >> L3_ERROR_LOG_CMD; 45 } 46 47 static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error) 48 { 49 return (error & 0xff00) >> L3_ERROR_LOG_INITID; 50 } 51 52 static inline unsigned omap3_l3_decode_req_info(u64 error) 53 { 54 return (error >> 32) & 0xffff; 55 } 56 57 static char *omap3_l3_code_string(u8 code) 58 { 59 switch (code) { 60 case OMAP_L3_CODE_NOERROR: 61 return "No Error"; 62 case OMAP_L3_CODE_UNSUP_CMD: 63 return "Unsupported Command"; 64 case OMAP_L3_CODE_ADDR_HOLE: 65 return "Address Hole"; 66 case OMAP_L3_CODE_PROTECT_VIOLATION: 67 return "Protection Violation"; 68 case OMAP_L3_CODE_IN_BAND_ERR: 69 return "In-band Error"; 70 case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT: 71 return "Request Timeout Not Accepted"; 72 case OMAP_L3_CODE_REQ_TOUT_NO_RESP: 73 return "Request Timeout, no response"; 74 default: 75 return "UNKNOWN error"; 76 } 77 } 78 79 static char *omap3_l3_initiator_string(u8 initid) 80 { 81 switch (initid) { 82 case OMAP_L3_LCD: 83 return "LCD"; 84 case OMAP_L3_SAD2D: 85 return "SAD2D"; 86 case OMAP_L3_IA_MPU_SS_1: 87 case OMAP_L3_IA_MPU_SS_2: 88 case OMAP_L3_IA_MPU_SS_3: 89 case OMAP_L3_IA_MPU_SS_4: 90 case OMAP_L3_IA_MPU_SS_5: 91 return "MPU"; 92 case OMAP_L3_IA_IVA_SS_1: 93 case OMAP_L3_IA_IVA_SS_2: 94 case OMAP_L3_IA_IVA_SS_3: 95 return "IVA_SS"; 96 case OMAP_L3_IA_IVA_SS_DMA_1: 97 case OMAP_L3_IA_IVA_SS_DMA_2: 98 case OMAP_L3_IA_IVA_SS_DMA_3: 99 case OMAP_L3_IA_IVA_SS_DMA_4: 100 case OMAP_L3_IA_IVA_SS_DMA_5: 101 case OMAP_L3_IA_IVA_SS_DMA_6: 102 return "IVA_SS_DMA"; 103 case OMAP_L3_IA_SGX: 104 return "SGX"; 105 case OMAP_L3_IA_CAM_1: 106 case OMAP_L3_IA_CAM_2: 107 case OMAP_L3_IA_CAM_3: 108 return "CAM"; 109 case OMAP_L3_IA_DAP: 110 return "DAP"; 111 case OMAP_L3_SDMA_WR_1: 112 case OMAP_L3_SDMA_WR_2: 113 return "SDMA_WR"; 114 case OMAP_L3_SDMA_RD_1: 115 case OMAP_L3_SDMA_RD_2: 116 case OMAP_L3_SDMA_RD_3: 117 case OMAP_L3_SDMA_RD_4: 118 return "SDMA_RD"; 119 case OMAP_L3_USBOTG: 120 return "USB_OTG"; 121 case OMAP_L3_USBHOST: 122 return "USB_HOST"; 123 default: 124 return "UNKNOWN Initiator"; 125 } 126 } 127 128 /* 129 * omap3_l3_block_irq - handles a register block's irq 130 * @l3: struct omap3_l3 * 131 * @base: register block base address 132 * @error: L3_ERROR_LOG register of our block 133 * 134 * Called in hard-irq context. Caller should take care of locking 135 * 136 * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error 137 * Analysis Sequence, we are following that sequence here, please 138 * refer to that Figure for more information on the subject. 139 */ 140 static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3, 141 u64 error, int error_addr) 142 { 143 u8 code = omap3_l3_decode_error_code(error); 144 u8 initid = omap3_l3_decode_initid(error); 145 u8 multi = error & L3_ERROR_LOG_MULTI; 146 u32 address = omap3_l3_decode_addr(error_addr); 147 148 pr_err("%s seen by %s %s at address %x\n", 149 omap3_l3_code_string(code), 150 omap3_l3_initiator_string(initid), 151 multi ? "Multiple Errors" : "", address); 152 WARN_ON(1); 153 154 return IRQ_HANDLED; 155 } 156 157 static irqreturn_t omap3_l3_app_irq(int irq, void *_l3) 158 { 159 struct omap3_l3 *l3 = _l3; 160 u64 status, clear; 161 u64 error; 162 u64 error_addr; 163 u64 err_source = 0; 164 void __iomem *base; 165 int int_type; 166 irqreturn_t ret = IRQ_NONE; 167 168 int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR; 169 if (!int_type) { 170 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0); 171 /* 172 * if we have a timeout error, there's nothing we can 173 * do besides rebooting the board. So let's BUG on any 174 * of such errors and handle the others. timeout error 175 * is severe and not expected to occur. 176 */ 177 BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK); 178 } else { 179 status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1); 180 /* No timeout error for debug sources */ 181 } 182 183 /* identify the error source */ 184 err_source = __ffs(status); 185 186 base = l3->rt + omap3_l3_bases[int_type][err_source]; 187 error = omap3_l3_readll(base, L3_ERROR_LOG); 188 if (error) { 189 error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR); 190 ret |= omap3_l3_block_irq(l3, error, error_addr); 191 } 192 193 /* Clear the status register */ 194 clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) | 195 L3_AGENT_STATUS_CLEAR_TA; 196 omap3_l3_writell(base, L3_AGENT_STATUS, clear); 197 198 /* clear the error log register */ 199 omap3_l3_writell(base, L3_ERROR_LOG, error); 200 201 return ret; 202 } 203 204 #if IS_BUILTIN(CONFIG_OF) 205 static const struct of_device_id omap3_l3_match[] = { 206 { 207 .compatible = "ti,omap3-l3-smx", 208 }, 209 { }, 210 }; 211 MODULE_DEVICE_TABLE(of, omap3_l3_match); 212 #endif 213 214 static int omap3_l3_probe(struct platform_device *pdev) 215 { 216 struct omap3_l3 *l3; 217 struct resource *res; 218 int ret; 219 220 l3 = kzalloc(sizeof(*l3), GFP_KERNEL); 221 if (!l3) 222 return -ENOMEM; 223 224 platform_set_drvdata(pdev, l3); 225 226 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 227 if (!res) { 228 dev_err(&pdev->dev, "couldn't find resource\n"); 229 ret = -ENODEV; 230 goto err0; 231 } 232 l3->rt = ioremap(res->start, resource_size(res)); 233 if (!l3->rt) { 234 dev_err(&pdev->dev, "ioremap failed\n"); 235 ret = -ENOMEM; 236 goto err0; 237 } 238 239 l3->debug_irq = platform_get_irq(pdev, 0); 240 ret = request_irq(l3->debug_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING, 241 "l3-debug-irq", l3); 242 if (ret) { 243 dev_err(&pdev->dev, "couldn't request debug irq\n"); 244 goto err1; 245 } 246 247 l3->app_irq = platform_get_irq(pdev, 1); 248 ret = request_irq(l3->app_irq, omap3_l3_app_irq, IRQF_TRIGGER_RISING, 249 "l3-app-irq", l3); 250 if (ret) { 251 dev_err(&pdev->dev, "couldn't request app irq\n"); 252 goto err2; 253 } 254 255 return 0; 256 257 err2: 258 free_irq(l3->debug_irq, l3); 259 err1: 260 iounmap(l3->rt); 261 err0: 262 kfree(l3); 263 return ret; 264 } 265 266 static int omap3_l3_remove(struct platform_device *pdev) 267 { 268 struct omap3_l3 *l3 = platform_get_drvdata(pdev); 269 270 free_irq(l3->app_irq, l3); 271 free_irq(l3->debug_irq, l3); 272 iounmap(l3->rt); 273 kfree(l3); 274 275 return 0; 276 } 277 278 static struct platform_driver omap3_l3_driver = { 279 .probe = omap3_l3_probe, 280 .remove = omap3_l3_remove, 281 .driver = { 282 .name = "omap_l3_smx", 283 .of_match_table = of_match_ptr(omap3_l3_match), 284 }, 285 }; 286 287 static int __init omap3_l3_init(void) 288 { 289 return platform_driver_register(&omap3_l3_driver); 290 } 291 postcore_initcall_sync(omap3_l3_init); 292 293 static void __exit omap3_l3_exit(void) 294 { 295 platform_driver_unregister(&omap3_l3_driver); 296 } 297 module_exit(omap3_l3_exit); 298 299 MODULE_AUTHOR("Felipe Balbi"); 300 MODULE_AUTHOR("Santosh Shilimkar"); 301 MODULE_AUTHOR("Sricharan R"); 302 MODULE_DESCRIPTION("OMAP3XXX L3 Interconnect Driver"); 303 MODULE_LICENSE("GPL"); 304